[go: up one dir, main page]

WO2016157962A1 - Power supply device - Google Patents

Power supply device Download PDF

Info

Publication number
WO2016157962A1
WO2016157962A1 PCT/JP2016/052074 JP2016052074W WO2016157962A1 WO 2016157962 A1 WO2016157962 A1 WO 2016157962A1 JP 2016052074 W JP2016052074 W JP 2016052074W WO 2016157962 A1 WO2016157962 A1 WO 2016157962A1
Authority
WO
WIPO (PCT)
Prior art keywords
relay
state
power supply
converter
storage battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/052074
Other languages
French (fr)
Japanese (ja)
Inventor
石倉祐樹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Publication of WO2016157962A1 publication Critical patent/WO2016157962A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks

Definitions

  • the present invention relates to a power supply device that includes a DC-DC converter and is connected to a DC power supply.
  • Patent Document 1 discloses a protection device that eliminates the influence when a DC power supply is erroneously reversely connected (with reverse polarity).
  • the power system is alternating current, and the storage battery is direct current. Therefore, an inverter is required before supplying the load.
  • a DC-DC converter for transforming the voltage between the inverter and the storage battery is required.
  • the DC-DC converter does not operate, and the smoothing electrolytic capacitor connected to the output stage of the DC-DC converter is affected. There is a risk of hit. This problem cannot be solved by Patent Document 1.
  • an object of the present invention is to provide a power supply device that prevents the influence of reverse connection of a DC power supply.
  • the power supply device includes a positive electrode side connection terminal and a negative electrode side connection terminal to which a direct current power supply is connected, a DC-DC converter connected to the positive electrode side connection terminal and the negative electrode side connection terminal, and the DC-DC A voltage detection unit for detecting an output voltage of the converter; a first relay connected between the positive electrode side connection terminal and the DC-DC converter; and a gap between the negative electrode side connection terminal and the DC-DC converter.
  • a control unit that switches to any one of the states, wherein the control unit switches to the first state in the initial state, switches from the first state to the second state at a predetermined timing, and the voltage in the second state.
  • the control unit switches to the first state in the initial state, switches from the first state to the second state at a predetermined timing, and the voltage in the second state.
  • the second state is switched to the third state.
  • the first relay is a DC relay
  • the second relay and the third relay are AC relays.
  • the DC-DC converter is preferably a boost converter.
  • the control unit of the power supply device preferably reports an error when the voltage detected by the voltage detection unit in the second state is less than a predetermined value.
  • the present invention it is possible to prevent an inrush current from flowing through the DC-DC converter and to prevent an influence caused by the reverse connection of the DC power supply.
  • FIG. 2 (A) is a figure which shows the case where a storage battery is reversely connected, when FIG. 2 (B) is reversely connected.
  • Flow chart showing processing of control circuit Circuit diagram of power supply device according to Embodiment 2 The figure which shows the case where the power supply device which concerns on Embodiment 2 is applied to HEMS.
  • FIG. 1 is a circuit diagram of a power supply device 1 according to the first embodiment.
  • FIG. 1 shows a case where the power supply device 1 is applied to a nighttime power storage and daytime discharge system.
  • the nighttime storage means that the power purchased from the power system 32 at night is stored in the storage battery B1.
  • the daytime discharge is to supply electric power stored in the storage battery B1 to a load (home appliance, etc.).
  • the power supply device 1 includes input / output connection terminals IO1, IO2, IO3, and IO4.
  • the input / output connection terminals IO1, IO2 are connected to the storage battery B1.
  • the input / output connection terminals IO3 and IO4 are connected to the inverter 31.
  • the inverter 31 is connected to the power system 32.
  • the power supply device 1 inputs the power purchased from the power system 32 from the input / output connection terminals IO3 and IO4 via the inverter 31, and charges the storage battery B1. Further, the power supply device 1 inputs the voltage stored in the storage battery B ⁇ b> 1 from the input / output connection terminals IO ⁇ b> 1 and IO ⁇ b> 2 and outputs it to the inverter 31.
  • the power supply device 1 also for a solar power generation system, for example.
  • the input / output connection terminals IO3 and IO4 of the power supply device 1 are connected to the inverter 31 and a solar panel (not shown).
  • the power supply device 1 inputs the electric power generated with the solar panel from input / output connection terminal IO3, IO4, and charges storage battery B1.
  • the input / output connection terminal IO1 is an example of the “positive electrode side connection terminal” according to the present invention.
  • the input / output connection terminal IO2 is an example of the “negative electrode side connection terminal” according to the present invention.
  • a DC-DC converter 10 is connected between the input / output connection terminals IO1, IO2 and the input / output connection terminals IO3, IO4.
  • the DC-DC converter 10 includes an inductor L1, switching elements Q1 and Q2, and an electrolytic capacitor C1.
  • the switching elements Q1, Q2 are n-type MOS-FETs.
  • the DC-DC converter 10 is a step-up converter when the input / output connection terminals IO1 and IO2 are input, and boosts the DC voltage input from the input / output connection terminals IO1 and IO2 to the input / output connection terminals IO3 and IO4 side. Output to.
  • the DC-DC converter 10 is a step-down converter when the input / output connection terminals IO3 and IO4 are input, and steps down the DC voltage input from the input / output connection terminals IO3 and IO4. Output to the IO1 and IO2 sides.
  • a relay Ry1 is provided between the input / output connection terminal IO1 and the DC-DC converter 10.
  • a relay Ry2 is provided between the input / output connection terminal IO2 and the DC-DC converter 10.
  • Relays Ry1 and Ry2 are AC relays, and their contacts are off during normal times. Then, the relay Ry1 is turned on when a control circuit 12 described later passes a current through the operation coil X1. Similarly, the relay Ry2 is turned on when the control circuit 12 passes a current through the operation coil X2.
  • the relay Ry1 is an example of the “first relay” according to the present invention.
  • the relay Ry2 is an example of the “second relay” according to the present invention.
  • a series circuit 11 of a diode D1, a resistor R1, and a relay Ry3 is connected in parallel to the relay Ry1.
  • the diode D1 prevents backflow when the storage battery B1 is reversely connected to the input / output connection terminals IO1 and IO2.
  • the resistor R1 prevents an inrush current when the storage battery B1 is connected.
  • the relay Ry3 connects or disconnects the series circuit 11 to the input / output connection terminal IO1.
  • the relay Ry3 is a direct current relay, and the contact is off during normal times. Then, the control circuit 12 described later is turned on when a current flows through the operation coil X3.
  • the relay Ry3 is an example of the “third relay” according to the present invention.
  • the power supply device 1 includes a control circuit 12.
  • the control circuit 12 is an example of the “control unit” according to the present invention.
  • the control circuit 12 includes a voltage detection unit 121, a reverse connection determination unit 122, a relay control unit 123, and an error notification unit 124. Further, the control circuit 12 performs switching control of the switching elements Q1, Q2 of the DC-DC converter 10.
  • the control circuit 12 controls the relays Ry1, Ry2, and Ry3 on and off by the relay control unit 123.
  • the voltage detector 121 detects the voltage Vc output from the DC-DC converter 10. Specifically, a voltage dividing circuit including resistors R21 and R22 is connected in parallel to the electrolytic capacitor C1 of the DC-DC converter 10. The voltage detector 121 detects the voltage divided by the resistors R21 and R22.
  • the reverse connection determination unit 122 determines whether or not the voltage detected by the voltage detection unit 121 substantially matches the voltage of the storage battery B1. When the voltages match, the reverse connection determination unit 122 determines that the polarity of the storage battery B1 is correctly connected to the input / output connection terminals IO1 and IO2. When the voltages do not match, the reverse connection determination unit 122 determines that the storage battery B1 is reversely connected to the input / output connection terminals IO1 and IO2. In addition, the reverse connection determination part 122 has memorize
  • the relay control unit 123 Based on the determination result of the reverse connection determination unit 122, the relay control unit 123 causes the current to flow through or stops the operation coils X1, X2, and X3, and turns on and off the relays Ry1, Ry2, and Ry3.
  • relays Ry1, Ry2, and Ry3 are in an off state (hereinafter referred to as a first state).
  • the initial state is, for example, a state where the storage battery B1 is not connected or a state where the control circuit 12 is not driven.
  • the relay control unit 123 causes a current to flow through the operation coils X2 and X3 and turns on the relays Ry2 and Ry3.
  • the relay Ry1 is off.
  • this state is referred to as a second state.
  • the predetermined timing is, for example, when the storage battery B1 is connected to the input / output connection terminals IO1 and IO2. Whether or not the storage battery B1 is connected may be detected by, for example, a sensor or may be detected by a user input.
  • the relay Ry3 When switching from the first state to the second state, the relay Ry3 is turned on after the relay Ry2 is turned on. Since the relay Ry2 is turned on in a non-energized state, a large current does not flow, and an arc can be suppressed. Further, the relay Ry2 can be an inexpensive AC relay.
  • FIG. 2 is a diagram for explaining the direction of the current flowing through the power supply device 1 in the second state.
  • FIG. 2A shows a case where the storage battery B1 is correctly connected, and FIG. Shows when connected.
  • the current from the storage battery B1 flows to the DC-DC converter 10 through the series circuit 11 as shown in FIG. Although the switching elements Q1 and Q2 of the DC-DC converter 10 are off, the current passes through the body diode of the switching element Q2. Electric charges are stored in the electrolytic capacitor C1. Therefore, after a predetermined time has elapsed, the voltage Vc detected by the voltage detection unit 121 substantially matches the storage battery B1. For this reason, when the voltage detected by the voltage detection unit 121 matches the voltage of the storage battery B1, the reverse connection determination unit 122 determines that the storage battery B1 is correctly connected.
  • the diode D1 prevents the backflow of the current and the current does not flow. Therefore, no electric charge is stored in the electrolytic capacitor C1, and the voltage Vc detected by the voltage detection unit 121 does not coincide with the storage battery B1 even if time elapses. For this reason, when the voltage detected by the voltage detection unit 121 does not match the voltage of the storage battery B1, the reverse connection determination unit 122 determines that the storage battery B1 is reversely connected.
  • this state is referred to as a third state.
  • the voltage stored in the storage battery B1 is boosted by the DC-DC converter 10 and output from the input / output connection terminals IO3 and IO4.
  • the relay Ry3 When switching from the second state to the third state, the relay Ry3 is turned off and then the relay Ry3 is turned off. In this case, since the current that flows when the relay Ry1 is on is small, the arc can be suppressed as in the relay Ry2. Further, the relay Ry3 can be an inexpensive AC relay.
  • the error notification unit 124 When the reverse connection determination unit 122 determines that the storage battery B1 is reversely connected in the second state, the error notification unit 124 notifies an error (reverse connection of the storage battery B1).
  • the error notification unit 124 may notify the error by a buzzer or the like. Further, an error signal may be output outside the power supply device 1. In this case, error notification is performed by an external device of the power supply device 1.
  • FIG. 3 is a flowchart showing the processing of the control circuit 12. At the start of processing, relays Ry1, Ry2, and Ry3 are off.
  • the control circuit 12 determines whether or not the storage battery B1 is connected to the input / output connection terminal IO1 and the input / output connection terminal IO2 (S1). As described above, whether or not the storage battery B1 is connected may be detected by a sensor or may be detected by a user input. When the storage battery B1 is not connected (S1: NO), the control circuit 12 re-executes the process of S1. When the storage battery B1 is connected (S1: YES), the control circuit 12 switches from the first state to the second state (S2).
  • the control circuit 12 waits for a predetermined time (S3) and detects the voltage Vc (S4).
  • the control circuit 12 determines whether or not the detected voltage Vc matches the voltage Vbat of the storage battery B1 (S5).
  • the control circuit 12 switches from the second state to the third state (S6). Then, the control circuit 12 starts driving the DC-DC converter 10 (S7).
  • the control circuit 12 determines that the storage battery B1 is reversely connected, and performs error notification (S8). By performing the error notification, it is possible to perform appropriate processing such as reconnecting the storage battery B1 correctly.
  • the control circuit 12 may turn off the relays Ry1, Ry2, and Ry3, that is, switch to the first state. In this case, the storage battery B1 side and the DC-DC converter 10 side can be completely separated electrically.
  • FIG. 4 is a circuit diagram of the power supply device 2 according to the second embodiment.
  • FIG. 5 is a diagram illustrating a case where the power supply device 2 is applied to a HEMS (Home Energy Management System) 100.
  • HEMS Home Energy Management System
  • the input / output connection terminals IO3 and IO4 of the power supply device 2 are connected to the inverter 31 and the power generation device 40.
  • the inverter 31 is connected to the power system 32 and the distribution board 33.
  • the power generation device 40 includes a solar panel 41 and a PV converter 42.
  • the PV converter 42 converts the electric power generated in the solar panel 41 to a constant voltage and outputs it to the power supply device 2 or the inverter 31.
  • the power generation device 40 may be a wind power generation device or a gas power generation device.
  • the power supply device 2 stores the electric power generated by the power generation device 40 in the storage battery B1. Moreover, the power supply device 2 inputs the electric power purchased from the electric power grid
  • the power supply device 2 includes an LLC resonant converter 20 in addition to the configuration of the power supply device 1 according to the first embodiment.
  • the LLC resonant converter 20 includes switching circuits 21 and 22 and a transformer T.
  • the switching circuits 21 and 22 are switching-controlled by a control circuit (not shown).
  • the switching circuit 21 includes a series circuit of switching elements Q31 and Q32 and a series circuit of switching elements Q33 and Q34.
  • the coupling coil N1 of the transformer T is connected to a connection point between the switching elements Q31 and Q32 and a connection point between the switching elements Q33 and Q34.
  • the switching circuit 22 includes a series circuit of switching elements Q41 and Q42 and a series circuit of switching elements Q43 and Q44.
  • the coupling coil N2 of the transformer T is connected to a connection point between the switching elements Q41 and Q42 and a connection point between the switching elements Q43 and Q44.
  • a capacitor C3 is connected to the switching circuit 22.
  • a capacitor C2 and an inductor L2 are connected between the coupling coil N1 of the transformer T and the switching circuit 21.
  • the capacitor C2 and the inductor L2 form an LLC resonance circuit together with the coupling coil N1.
  • the inductor L2 may be a leakage inductance of the transformer T.
  • an LLC resonance circuit is formed by the capacitor C2, the leakage inductance, and the exciting inductance of the transformer T.
  • the power conversion efficiency of the LLC resonant converter 20 is highest when the switching circuits 21 and 22 are operated near 50% duty. For this reason, by controlling the output voltage (input voltage of the LLC resonant converter 20) by the DC-DC converter 10, the power conversion efficiency in the LLC resonant converter 20 can be operated in a high state. Further, it is possible to insulate between the storage battery B1 and a DC voltage bus to which the power generation device 40 and the inverter 31 are connected.
  • the power supply device 2 can detect reverse connection of the storage battery B1 by a control circuit (not shown) as in the first embodiment. Thereby, the influence by reverse connection of storage battery B1 can be suppressed.
  • the detection of the reverse connection of the storage battery B1 is the same as that in the first embodiment, and thus the description thereof is omitted.
  • B1 Storage battery C1 ... Electrolytic capacitor C2 ... Capacitor C3 ... Capacitor D1 ... Diodes IO1, IO2, IO3, IO4 ... Input / output connection terminals L1, L2 ... Inductors N1, N2 ... Coupling coils Q1, Q2 ... Switching elements Q31, Q32, Q33 , Q34 ... switching elements Q41, Q42, Q43, Q44 ... switching element R1 ... resistors R21, R22 ... resistors Ry1, Ry2, Ry3 ... relay T ... transformer X1 ... operation coils X1, X2, X3 ... operation coils 1, 2 ... power supply Device 10 ... DC-DC converter 11 ... Series circuit 12 ...
  • Control circuit 20 ... LLC resonant converters 21, 22 ... Switching circuit 31 ... Inverter 32 ... Power system 33 ... Distribution panel 40 ... Power generation device 41 ... Solar panel 42 ... PV converter 100 ... HEMS 121 ... Voltage detection unit 122 ... Reverse connection determination unit 123 ... Relay control unit 124 ... Error notification unit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

This power supply device (1) is provided with: relays (Ry1, Ry2) that are provided between input/output connection terminals (IO1, IO2), to which a storage battery (B1) is connected, and a DC-DC converter (10); a relay (Ry3) that is connected in parallel to relay (Ry1); and a control circuit (12). The relays (Ry1, Ry2, Ry3) are off in an initial state. The control circuit (12) turns relay (Ry1) off and relays (Ry2, Ry3) on at a prescribed timing. When the output voltage of the DC-DC converter (10) is at or above a prescribed value, the control circuit (12) turns relays (Ry1, Ry2) on and relay (Ry3) off. This makes it possible to provide a power supply device in which the impact of reverse connection of a DC power source is prevented.

Description

電源装置Power supply

　本発明は、ＤＣ-ＤＣコンバータを備え、直流電源が接続される電源装置に関する。 The present invention relates to a power supply device that includes a DC-DC converter and is connected to a DC power supply.

　夜間に電力系統から供給される電力を蓄電池に蓄電しておき、昼間の負荷増大時や停電時に放電して負荷へ供給するシステム、あるいは、発電機、例えばソーラパネルで発電された電力のうち、余剰電力を蓄電池に蓄電し、負荷電力増大時または停電時等に蓄電した電力を負荷へ供給し、使用することができるシステムなどが提案されている。これらのシステムの敷設時において、施工業者が蓄電池を接続する場合に、誤って極性を逆にして接続したとき、回路中の電子部品、例えば電解コンデンサに、蓄電池から逆極性の電圧が印加され、その電子部品が破壊されるといった問題がある。そこで、特許文献１には、直流電源が誤って逆接続（極性が逆に接続）された場合に、その影響をなくす保護装置が開示されている。 Stores the power supplied from the power system at night in the storage battery, discharges it during daytime load increase or power failure, and supplies it to the load, or among the power generated by a generator, for example, a solar panel, There has been proposed a system that can store surplus power in a storage battery and supply the stored power to the load when the load power increases or during a power outage. When laying these systems, when the contractor connects the storage battery, when the polarity is reversed and connected, the reverse polarity voltage is applied from the storage battery to the electronic components in the circuit, for example, the electrolytic capacitor, There is a problem that the electronic component is destroyed. Therefore, Patent Document 1 discloses a protection device that eliminates the influence when a DC power supply is erroneously reversely connected (with reverse polarity).

特開２００６－２７１０３９号公報JP 2006-271039 A

　ところで、上述のシステムでは、電力系統は交流であり、蓄電池は直流であるため、負荷へ供給する前段にインバータが必要となる。また、インバータと蓄電池との間に電圧を変圧するためのＤＣ－ＤＣコンバータが必要となる。ＤＣ－ＤＣコンバータを用いた場合に、直流電源が逆接続されると、ＤＣ－ＤＣコンバータが動作せず、また、ＤＣ-ＤＣコンバータの出力段に接続されている平滑用の電解コンデンサ等に影響がおよぶおそれがある。この問題は、特許文献１では解決できない。 By the way, in the system described above, the power system is alternating current, and the storage battery is direct current. Therefore, an inverter is required before supplying the load. In addition, a DC-DC converter for transforming the voltage between the inverter and the storage battery is required. When a DC-DC converter is used and the DC power supply is reversely connected, the DC-DC converter does not operate, and the smoothing electrolytic capacitor connected to the output stage of the DC-DC converter is affected. There is a risk of hit. This problem cannot be solved by Patent Document 1.

　そこで、本発明の目的は、直流電源の逆接続による影響を防止する電源装置を提供することにある。 Therefore, an object of the present invention is to provide a power supply device that prevents the influence of reverse connection of a DC power supply.

　本発明に係る電源装置は、直流電源が接続される正極側接続端子および負極側接続端子と、前記正極側接続端子および前記負極側接続端子に接続されたＤＣ－ＤＣコンバータと、前記ＤＣ－ＤＣコンバータの出力電圧を検出する電圧検出部と、前記正極側接続端子と前記ＤＣ－ＤＣコンバータとの間に接続された第１リレーと、前記負極側接続端子と前記ＤＣ－ＤＣコンバータとの間に接続された第２リレーと、前記第１リレーに並列接続された、整流素子、抵抗素子および第３リレーの直列回路と、前記第１リレー、前記第２リレーおよび前記第３リレーがオフの第１状態と、前記第１リレーがオフ、前記第２リレーおよび前記第３リレーがオンの第２状態と、前記第１リレーおよび前記第２リレーがオン、前記第３リレーがオフの第３状態とのいずれかに切り替える制御部と、を備え、前記制御部は、初期状態では前記第１状態にし、所定タイミングで前記第１状態から前記第２状態に切り替え、前記第２状態で前記電圧検出部が検出した電圧が所定値以上である場合、前記第２状態から前記第３状態へと切り替えることを特徴とする。 The power supply device according to the present invention includes a positive electrode side connection terminal and a negative electrode side connection terminal to which a direct current power supply is connected, a DC-DC converter connected to the positive electrode side connection terminal and the negative electrode side connection terminal, and the DC-DC A voltage detection unit for detecting an output voltage of the converter; a first relay connected between the positive electrode side connection terminal and the DC-DC converter; and a gap between the negative electrode side connection terminal and the DC-DC converter. A connected second relay; a series circuit of a rectifying element, a resistance element, and a third relay connected in parallel to the first relay; and the first relay, the second relay, and the third relay being off. 1 state, a second state in which the first relay is off, the second relay and the third relay are on, and a third state in which the first relay and the second relay are on and the third relay is off A control unit that switches to any one of the states, wherein the control unit switches to the first state in the initial state, switches from the first state to the second state at a predetermined timing, and the voltage in the second state. When the voltage detected by the detection unit is equal to or higher than a predetermined value, the second state is switched to the third state.

　この構成では、初期状態の第１状態では、正極側接続端子および負極側接続端子に直流電源を接続しても電流が流れない。第２状態のとき、直流電源からの電流は、直列回路の抵抗素子により制限され、ＤＣ-ＤＣコンバータに突入電流が流れることを防止できる。また、第２状態のときに直流電源が逆接続されても、直列回路の整流素子により、ＤＣ-ＤＣコンバータには電流が流れない。そして、第２状態で電圧検出部が検出した電圧が所定値以上、例えば、接続した直流電源の電圧値以上である場合、電源装置は、直流電源が正極側接続端子および負極側接続端子に正しく接続されているものと判定する。そして、直流電源からの電流がＤＣ-ＤＣコンバータに流れるように、第３状態に切り替える。これにより、ＤＣ-ＤＣコンバータに突入電流が流れることを防止しつつ、直流電源が逆接続されることによる影響を防止できる。 In this configuration, in the first state of the initial state, no current flows even if a DC power source is connected to the positive electrode side connection terminal and the negative electrode side connection terminal. In the second state, the current from the DC power source is limited by the resistance element of the series circuit, and it is possible to prevent an inrush current from flowing through the DC-DC converter. Further, even when the direct current power supply is reversely connected in the second state, no current flows through the DC-DC converter due to the rectifying element of the series circuit. When the voltage detected by the voltage detection unit in the second state is equal to or higher than a predetermined value, for example, equal to or higher than the voltage value of the connected DC power supply, the power supply device correctly connects the DC power supply to the positive connection terminal and the negative connection terminal. It is determined that it is connected. And it switches to a 3rd state so that the electric current from DC power supply may flow into a DC-DC converter. As a result, it is possible to prevent an inrush current from flowing through the DC-DC converter and to prevent an influence caused by reverse connection of the DC power source.

　本発明に係る電源装置の前記第１リレーは直流リレーであり、前記第２リレーおよび前記第３リレーは交流リレーであることが好ましい。 In the power supply device according to the present invention, it is preferable that the first relay is a DC relay, and the second relay and the third relay are AC relays.

　この構成では、交流リレーを用いることで、アークを抑えることができ、アークによる影響を防止できる。 In this configuration, by using an AC relay, the arc can be suppressed and the influence of the arc can be prevented.

　本発明に係る電源装置では、前記ＤＣ－ＤＣコンバータは昇圧コンバータであることが好ましい。 In the power supply device according to the present invention, the DC-DC converter is preferably a boost converter.

　本発明に係る電源装置の前記制御部は、前記第２状態で前記電圧検出部が検出した電圧が所定値未満である場合、エラーを報知することが好ましい。 The control unit of the power supply device according to the present invention preferably reports an error when the voltage detected by the voltage detection unit in the second state is less than a predetermined value.

　この構成では、エラー報知することで、直流電源が逆接続されたおそれがあることを報知でき、直流電源の逆接続による影響を防止できる。 In this configuration, by notifying the error, it is possible to notify that the DC power source may be reversely connected, and to prevent the influence of the reverse connection of the DC power source.

　本発明によれば、ＤＣ-ＤＣコンバータに突入電流が流れることを防止しつつ、直流電源が逆接続されることによる影響を防止できる。 According to the present invention, it is possible to prevent an inrush current from flowing through the DC-DC converter and to prevent an influence caused by the reverse connection of the DC power supply.

実施形態１に係る電源装置の回路図Circuit diagram of power supply apparatus according to Embodiment 1 第２状態で電源装置に流れる電流方向について説明するための図であり、図２（Ａ）は、蓄電池を正しく接続した場合、図２（Ｂ）は、蓄電池を逆接続した場合を示す図It is a figure for demonstrating the direction of the electric current which flows into a power supply device in a 2nd state, and FIG. 2 (A) is a figure which shows the case where a storage battery is reversely connected, when FIG. 2 (B) is reversely connected. 制御回路の処理を示すフローチャートFlow chart showing processing of control circuit 実施形態２に係る電源装置の回路図Circuit diagram of power supply device according to Embodiment 2 実施形態２に係る電源装置をＨＥＭＳに適用した場合を示す図The figure which shows the case where the power supply device which concerns on Embodiment 2 is applied to HEMS.

（実施形態１）
　図１は、実施形態１に係る電源装置１の回路図である。図１では、電源装置１を夜間蓄電および昼間放電システムに適用した場合を示す。夜間蓄電とは、夜間に電力系統３２から買電した電力を蓄電池Ｂ１に蓄電することである。昼間放電とは、蓄電池Ｂ１に蓄電された電力を負荷（家電製品等）へ供給することである。 (Embodiment 1)
FIG. 1 is a circuit diagram of a power supply device 1 according to the first embodiment. FIG. 1 shows a case where the power supply device 1 is applied to a nighttime power storage and daytime discharge system. The nighttime storage means that the power purchased from the power system 32 at night is stored in the storage battery B1. The daytime discharge is to supply electric power stored in the storage battery B1 to a load (home appliance, etc.).

　電源装置１は、入出力接続端子ＩＯ１，ＩＯ２，ＩＯ３，ＩＯ４を備えている。入出力接続端子ＩＯ１，ＩＯ２は蓄電池Ｂ１に接続される。入出力接続端子ＩＯ３，ＩＯ４は、インバータ３１に接続されている。インバータ３１は、電力系統３２に接続されている。電源装置１は、電力系統３２から買電した電力を、インバータ３１を介して入出力接続端子ＩＯ３，ＩＯ４から入力し、蓄電池Ｂ１に充電する。また、電源装置１は、蓄電池Ｂ１に蓄電された電圧を入出力接続端子ＩＯ１，ＩＯ２から入力し、インバータ３１へ出力する。 The power supply device 1 includes input / output connection terminals IO1, IO2, IO3, and IO4. The input / output connection terminals IO1, IO2 are connected to the storage battery B1. The input / output connection terminals IO3 and IO4 are connected to the inverter 31. The inverter 31 is connected to the power system 32. The power supply device 1 inputs the power purchased from the power system 32 from the input / output connection terminals IO3 and IO4 via the inverter 31, and charges the storage battery B1. Further, the power supply device 1 inputs the voltage stored in the storage battery B <b> 1 from the input / output connection terminals IO <b> 1 and IO <b> 2 and outputs it to the inverter 31.

　なお、電源装置１は、例えば、太陽光発電システムにも用いてもよい。この場合、電源装置１の入出力接続端子ＩＯ３，ＩＯ４は、インバータ３１と、不図示のソーラパネルとに接続される。そして、電源装置１は、ソーラパネルで発電された電力を入出力接続端子ＩＯ３，ＩＯ４から入力し、蓄電池Ｂ１に充電する。 In addition, you may use the power supply device 1 also for a solar power generation system, for example. In this case, the input / output connection terminals IO3 and IO4 of the power supply device 1 are connected to the inverter 31 and a solar panel (not shown). And the power supply device 1 inputs the electric power generated with the solar panel from input / output connection terminal IO3, IO4, and charges storage battery B1.

　入出力接続端子ＩＯ１は、本発明に係る「正極側接続端子」の一例である。入出力接続端子ＩＯ２は、本発明に係る「負極側接続端子」の一例である。 The input / output connection terminal IO1 is an example of the “positive electrode side connection terminal” according to the present invention. The input / output connection terminal IO2 is an example of the “negative electrode side connection terminal” according to the present invention.

　入出力接続端子ＩＯ１，ＩＯ２と入出力接続端子ＩＯ３，ＩＯ４との間には、ＤＣ－ＤＣコンバータ１０が接続されている。ＤＣ－ＤＣコンバータ１０は、インダクタＬ１、スイッチング素子Ｑ１，Ｑ２および電解コンデンサＣ１により構成されている。スイッチング素子Ｑ１，Ｑ２はｎ型ＭＯＳ－ＦＥＴである。ＤＣ-ＤＣコンバータ１０は、入出力接続端子ＩＯ１，ＩＯ２を入力とした場合、昇圧コンバータであり、入出力接続端子ＩＯ１，ＩＯ２から入力された直流電圧を昇圧し、入出力接続端子ＩＯ３，ＩＯ４側へ出力する。なお、ＤＣ-ＤＣコンバータ１０は、入出力接続端子ＩＯ３，ＩＯ４を入力とした場合には、降圧コンバータであり、入出力接続端子ＩＯ３，ＩＯ４から入力された直流電圧を降圧し、入出力接続端子ＩＯ１，ＩＯ２側へ出力する。 A DC-DC converter 10 is connected between the input / output connection terminals IO1, IO2 and the input / output connection terminals IO3, IO4. The DC-DC converter 10 includes an inductor L1, switching elements Q1 and Q2, and an electrolytic capacitor C1. The switching elements Q1, Q2 are n-type MOS-FETs. The DC-DC converter 10 is a step-up converter when the input / output connection terminals IO1 and IO2 are input, and boosts the DC voltage input from the input / output connection terminals IO1 and IO2 to the input / output connection terminals IO3 and IO4 side. Output to. Note that the DC-DC converter 10 is a step-down converter when the input / output connection terminals IO3 and IO4 are input, and steps down the DC voltage input from the input / output connection terminals IO3 and IO4. Output to the IO1 and IO2 sides.

　入出力接続端子ＩＯ１とＤＣ-ＤＣコンバータ１０との間にはリレーＲｙ１が設けられている。入出力接続端子ＩＯ２とＤＣ-ＤＣコンバータ１０との間にはリレーＲｙ２が設けられている。リレーＲｙ１，Ｒｙ２は交流リレーであり、平時は接点がオフである。そして、後述の制御回路１２が操作コイルＸ１に電流を流すことで、リレーＲｙ１はオンになる。同様に、制御回路１２が操作コイルＸ２に電流を流すことで、リレーＲｙ２はオンになる。リレーＲｙ１は、本発明に係る「第１リレー」の一例である。リレーＲｙ２は、本発明に係る「第２リレー」の一例である。 A relay Ry1 is provided between the input / output connection terminal IO1 and the DC-DC converter 10. A relay Ry2 is provided between the input / output connection terminal IO2 and the DC-DC converter 10. Relays Ry1 and Ry2 are AC relays, and their contacts are off during normal times. Then, the relay Ry1 is turned on when a control circuit 12 described later passes a current through the operation coil X1. Similarly, the relay Ry2 is turned on when the control circuit 12 passes a current through the operation coil X2. The relay Ry1 is an example of the “first relay” according to the present invention. The relay Ry2 is an example of the “second relay” according to the present invention.

　リレーＲｙ１には、ダイオードＤ１、抵抗Ｒ１およびリレーＲｙ３の直列回路１１が並列接続されている。ダイオードＤ１は、入出力接続端子ＩＯ１，ＩＯ２に蓄電池Ｂ１が逆接続された場合に、逆流を防止する。抵抗Ｒ１は、蓄電池Ｂ１の接続時の突入電流を防止する。リレーＲｙ３は、直列回路１１を入出力接続端子ＩＯ１に接続し、または遮断する。リレーＲｙ３は直流リレーであり、平時は接点がオフである。そして、後述の制御回路１２が操作コイルＸ３に電流を流すことで、オンになる。リレーＲｙ３は、本発明に係る「第３リレー」の一例である。 A series circuit 11 of a diode D1, a resistor R1, and a relay Ry3 is connected in parallel to the relay Ry1. The diode D1 prevents backflow when the storage battery B1 is reversely connected to the input / output connection terminals IO1 and IO2. The resistor R1 prevents an inrush current when the storage battery B1 is connected. The relay Ry3 connects or disconnects the series circuit 11 to the input / output connection terminal IO1. The relay Ry3 is a direct current relay, and the contact is off during normal times. Then, the control circuit 12 described later is turned on when a current flows through the operation coil X3. The relay Ry3 is an example of the “third relay” according to the present invention.

　電源装置１は制御回路１２を備えている。制御回路１２は、本発明に係る「制御部」の一例である。制御回路１２は、電圧検出部１２１、逆接続判定部１２２、リレー制御部１２３およびエラー報知部１２４を有している。また、制御回路１２は、ＤＣ-ＤＣコンバータ１０のスイッチング素子Ｑ１，Ｑ２をスイッチング制御する。なお、制御回路１２は、リレー制御部１２３により、リレーＲｙ１，Ｒｙ２，Ｒｙ３をオンオフ制御する。 The power supply device 1 includes a control circuit 12. The control circuit 12 is an example of the “control unit” according to the present invention. The control circuit 12 includes a voltage detection unit 121, a reverse connection determination unit 122, a relay control unit 123, and an error notification unit 124. Further, the control circuit 12 performs switching control of the switching elements Q1, Q2 of the DC-DC converter 10. The control circuit 12 controls the relays Ry1, Ry2, and Ry3 on and off by the relay control unit 123.

　電圧検出部１２１は、ＤＣ-ＤＣコンバータ１０から出力される電圧Ｖｃを検出する。詳しくは、抵抗Ｒ２１，Ｒ２２による分圧回路が、ＤＣ-ＤＣコンバータ１０の電解コンデンサＣ１に並列接続されている。電圧検出部１２１は、抵抗Ｒ２１，Ｒ２２により分圧された電圧を検出する。 The voltage detector 121 detects the voltage Vc output from the DC-DC converter 10. Specifically, a voltage dividing circuit including resistors R21 and R22 is connected in parallel to the electrolytic capacitor C1 of the DC-DC converter 10. The voltage detector 121 detects the voltage divided by the resistors R21 and R22.

　逆接続判定部１２２は、電圧検出部１２１が検出した電圧が、蓄電池Ｂ１の電圧と略一致するか否かを判定する。そして、電圧が一致している場合、逆接続判定部１２２は、蓄電池Ｂ１は入出力接続端子ＩＯ１，ＩＯ２に対し、極性が正しく接続されている、と判定する。電圧が一致していない場合、逆接続判定部１２２は、蓄電池Ｂ１は入出力接続端子ＩＯ１，ＩＯ２に逆接続されている、と判定する。なお、逆接続判定部１２２は、予め接続されるべき蓄電池Ｂ１の電圧値をメモリに記憶している。 The reverse connection determination unit 122 determines whether or not the voltage detected by the voltage detection unit 121 substantially matches the voltage of the storage battery B1. When the voltages match, the reverse connection determination unit 122 determines that the polarity of the storage battery B1 is correctly connected to the input / output connection terminals IO1 and IO2. When the voltages do not match, the reverse connection determination unit 122 determines that the storage battery B1 is reversely connected to the input / output connection terminals IO1 and IO2. In addition, the reverse connection determination part 122 has memorize | stored in the memory the voltage value of the storage battery B1 which should be connected previously.

　リレー制御部１２３は、逆接続判定部１２２の判定結果に基づき、操作コイルＸ１，Ｘ２，Ｘ３に電流を流し、または停止し、リレーＲｙ１，Ｒｙ２，Ｒｙ３をオンオフする。なお、初期状態では、リレーＲｙ１，Ｒｙ２，Ｒｙ３はオフの状態（以下、第１状態と言う）である。初期状態とは、例えば、蓄電池Ｂ１が接続されていない状態、または、制御回路１２が駆動していない状態である。 Based on the determination result of the reverse connection determination unit 122, the relay control unit 123 causes the current to flow through or stops the operation coils X1, X2, and X3, and turns on and off the relays Ry1, Ry2, and Ry3. In the initial state, relays Ry1, Ry2, and Ry3 are in an off state (hereinafter referred to as a first state). The initial state is, for example, a state where the storage battery B1 is not connected or a state where the control circuit 12 is not driven.

　第１状態で所定のタイミングで、リレー制御部１２３は、操作コイルＸ２，Ｘ３に電流を流し、リレーＲｙ２，Ｒｙ３をオンにする。このとき、リレーＲｙ１はオフである。以下、このときの状態を第２状態と言う。所定のタイミングは、例えば、入出力接続端子ＩＯ１，ＩＯ２に蓄電池Ｂ１が接続されたときである。蓄電池Ｂ１が接続されたか否かは、例えば、センサにより検出してもよいし、ユーザの入力により検出してもよい。 At a predetermined timing in the first state, the relay control unit 123 causes a current to flow through the operation coils X2 and X3 and turns on the relays Ry2 and Ry3. At this time, the relay Ry1 is off. Hereinafter, this state is referred to as a second state. The predetermined timing is, for example, when the storage battery B1 is connected to the input / output connection terminals IO1 and IO2. Whether or not the storage battery B1 is connected may be detected by, for example, a sensor or may be detected by a user input.

　なお、第１状態から第２状態へ切り替える場合、リレーＲｙ２をオンにした後、リレーＲｙ３をオンにする。リレーＲｙ２は、無通電状態でオンされるため、大電流が流れることがなく、アークを抑えることができる。また、リレーＲｙ２は、安価な交流リレーとすることができる。 When switching from the first state to the second state, the relay Ry3 is turned on after the relay Ry2 is turned on. Since the relay Ry2 is turned on in a non-energized state, a large current does not flow, and an arc can be suppressed. Further, the relay Ry2 can be an inexpensive AC relay.

　図２は、第２状態で電源装置１に流れる電流方向について説明するための図であり、図２（Ａ）は、蓄電池Ｂ１を正しく接続した場合、図２（Ｂ）は、蓄電池Ｂ１を逆接続した場合を示す。 FIG. 2 is a diagram for explaining the direction of the current flowing through the power supply device 1 in the second state. FIG. 2A shows a case where the storage battery B1 is correctly connected, and FIG. Shows when connected.

　第２状態で、蓄電池Ｂ１が正しく接続された場合、図２（Ａ）に示すように、蓄電池Ｂ１からの電流は、直列回路１１を通り、ＤＣ-ＤＣコンバータ１０へ流れる。ＤＣ-ＤＣコンバータ１０のスイッチング素子Ｑ１，Ｑ２はオフであるが、電流は、スイッチング素子Ｑ２のボディーダイオードを通る。そして、電解コンデンサＣ１には電荷が蓄えられる。したがって、一定時間経過後、電圧検出部１２１が検出する電圧Ｖｃは、蓄電池Ｂ１と略一致するようになる。このため、電圧検出部１２１が検出した電圧が蓄電池Ｂ１の電圧と一致した場合、逆接続判定部１２２は、蓄電池Ｂ１が正しく接続されていると判定する。 When the storage battery B1 is correctly connected in the second state, the current from the storage battery B1 flows to the DC-DC converter 10 through the series circuit 11 as shown in FIG. Although the switching elements Q1 and Q2 of the DC-DC converter 10 are off, the current passes through the body diode of the switching element Q2. Electric charges are stored in the electrolytic capacitor C1. Therefore, after a predetermined time has elapsed, the voltage Vc detected by the voltage detection unit 121 substantially matches the storage battery B1. For this reason, when the voltage detected by the voltage detection unit 121 matches the voltage of the storage battery B1, the reverse connection determination unit 122 determines that the storage battery B1 is correctly connected.

　また、初期状態（第１状態）から第２状態へと切り替えた場合、抵抗Ｒ１により電流が制限されるため、ＤＣ-ＤＣコンバータ１０の電解コンデンサＣ１に突入電流が流れることを防止できる。 In addition, when switching from the initial state (first state) to the second state, the current is limited by the resistor R1, and thus it is possible to prevent an inrush current from flowing through the electrolytic capacitor C1 of the DC-DC converter 10.

　第２状態で、蓄電池Ｂ１が逆接続された場合、図２（Ｂ）に示すように、ダイオードＤ１により、電流の逆流が防止され、電流は流れない。したがって、電解コンデンサＣ１には電荷が蓄えられず、時間が経過しても、電圧検出部１２１が検出する電圧Ｖｃは、蓄電池Ｂ１と一致しない。このため、電圧検出部１２１が検出した電圧が蓄電池Ｂ１の電圧と一致しない場合、逆接続判定部１２２は、蓄電池Ｂ１が逆接続されていると判定する。 In the second state, when the storage battery B1 is reversely connected, as shown in FIG. 2 (B), the diode D1 prevents the backflow of the current and the current does not flow. Therefore, no electric charge is stored in the electrolytic capacitor C1, and the voltage Vc detected by the voltage detection unit 121 does not coincide with the storage battery B1 even if time elapses. For this reason, when the voltage detected by the voltage detection unit 121 does not match the voltage of the storage battery B1, the reverse connection determination unit 122 determines that the storage battery B1 is reversely connected.

　第２状態において、蓄電池Ｂ１が正しく接続されていると逆接続判定部１２２が判定した場合、リレー制御部１２３は、操作コイルＸ１に電流を流すことにより、リレーＲｙ１をオンにする。そして、リレー制御部１２３は、操作コイルＸ３への電流を停止し、リレーＲｙ３をオフにする。リレーＲｙ２はオンのままである。以下、このときの状態を第３状態と言う。この第３状態で、蓄電池Ｂ１に蓄電された電圧は、ＤＣ-ＤＣコンバータ１０で昇圧され、入出力接続端子ＩＯ３，ＩＯ４から出力される。 In the second state, when the reverse connection determination unit 122 determines that the storage battery B1 is correctly connected, the relay control unit 123 turns on the relay Ry1 by passing a current through the operation coil X1. Then, the relay control unit 123 stops the current to the operation coil X3 and turns off the relay Ry3. Relay Ry2 remains on. Hereinafter, this state is referred to as a third state. In this third state, the voltage stored in the storage battery B1 is boosted by the DC-DC converter 10 and output from the input / output connection terminals IO3 and IO4.

　なお、第２状態から第３状態へ切り替える場合、リレーＲｙ１をオンにした後、リレーＲｙ３をオフにする。この場合、リレーＲｙ１のオン時に流れる電流は小さいため、リレーＲｙ２と同様に、アークを抑えることができる。また、リレーＲｙ３は、安価な交流リレーとすることができる。 When switching from the second state to the third state, the relay Ry3 is turned off and then the relay Ry3 is turned off. In this case, since the current that flows when the relay Ry1 is on is small, the arc can be suppressed as in the relay Ry2. Further, the relay Ry3 can be an inexpensive AC relay.

　エラー報知部１２４は、第２状態で、蓄電池Ｂ１が逆接続されていると逆接続判定部１２２が判定した場合、エラー（蓄電池Ｂ１の逆接続）を報知する。エラー報知部１２４は、ブザー等によりエラーを報知してもよい。また、電源装置１の外部にエラー信号を出力するようにしてもよい。この場合、電源装置１の外部機器でエラー報知が行われる。 When the reverse connection determination unit 122 determines that the storage battery B1 is reversely connected in the second state, the error notification unit 124 notifies an error (reverse connection of the storage battery B1). The error notification unit 124 may notify the error by a buzzer or the like. Further, an error signal may be output outside the power supply device 1. In this case, error notification is performed by an external device of the power supply device 1.

　図３は、制御回路１２の処理を示すフローチャートである。なお、処理開始時は、リレーＲｙ１，Ｒｙ２，Ｒｙ３はオフである。 FIG. 3 is a flowchart showing the processing of the control circuit 12. At the start of processing, relays Ry1, Ry2, and Ry3 are off.

　制御回路１２は、蓄電池Ｂ１が入出力接続端子ＩＯ１と入出力接続端子ＩＯ２とに接続されたか否かを判定する（Ｓ１）。前記のように、蓄電池Ｂ１が接続されたか否かは、センサにより検出してもよいし、ユーザの入力により検出してもよい。蓄電池Ｂ１が接続されていない場合（Ｓ１：ＮＯ）、制御回路１２はＳ１の処理を再実行する。蓄電池Ｂ１が接続された場合（Ｓ１：ＹＥＳ）、制御回路１２は、第１状態から第２状態へ切り替える（Ｓ２）。 The control circuit 12 determines whether or not the storage battery B1 is connected to the input / output connection terminal IO1 and the input / output connection terminal IO2 (S1). As described above, whether or not the storage battery B1 is connected may be detected by a sensor or may be detected by a user input. When the storage battery B1 is not connected (S1: NO), the control circuit 12 re-executes the process of S1. When the storage battery B1 is connected (S1: YES), the control circuit 12 switches from the first state to the second state (S2).

　制御回路１２は所定時間待機し（Ｓ３）、電圧Ｖｃを検出する（Ｓ４）。制御回路１２は、検出した電圧Ｖｃが、蓄電池Ｂ１の電圧Ｖbatと一致するか否かを判定する（Ｓ５）。電圧Ｖｃが電圧Ｖbatと一致する場合（Ｓ５：ＹＥＳ）、制御回路１２は、第２状態から第３状態へと切り替える（Ｓ６）。そして、制御回路１２は、ＤＣ-ＤＣコンバータ１０の駆動を開始する（Ｓ７）。 The control circuit 12 waits for a predetermined time (S3) and detects the voltage Vc (S4). The control circuit 12 determines whether or not the detected voltage Vc matches the voltage Vbat of the storage battery B1 (S5). When the voltage Vc matches the voltage Vbat (S5: YES), the control circuit 12 switches from the second state to the third state (S6). Then, the control circuit 12 starts driving the DC-DC converter 10 (S7).

　一方、電圧Ｖｃが電圧Ｖbatと一致しない場合（Ｓ５：ＮＯ）、制御回路１２は、蓄電池Ｂ１が逆接続されたと判定し、エラー報知を行う（Ｓ８）。エラー報知を行うことで、蓄電池Ｂ１を正しく接続し直すなど、適切な処理を行うことができる。なお、蓄電池Ｂ１が逆接続されたと判定した場合、制御回路１２は、リレーＲｙ１，Ｒｙ２，Ｒｙ３をオフ、すなわち、第１状態に切り替えるようにしてもよい。この場合、蓄電池Ｂ１側と、ＤＣ-ＤＣコンバータ１０側とを、電気的に完全に切り離すことができる。 On the other hand, when the voltage Vc does not match the voltage Vbat (S5: NO), the control circuit 12 determines that the storage battery B1 is reversely connected, and performs error notification (S8). By performing the error notification, it is possible to perform appropriate processing such as reconnecting the storage battery B1 correctly. When it is determined that the storage battery B1 is reversely connected, the control circuit 12 may turn off the relays Ry1, Ry2, and Ry3, that is, switch to the first state. In this case, the storage battery B1 side and the DC-DC converter 10 side can be completely separated electrically.

（実施形態２）
　図４は、実施形態２に係る電源装置２の回路図である。図５は、電源装置２を、ＨＥＭＳ（HomeEnergy Management System）１００に適用した場合を示す図である。 (Embodiment 2)
FIG. 4 is a circuit diagram of the power supply device 2 according to the second embodiment. FIG. 5 is a diagram illustrating a case where the power supply device 2 is applied to a HEMS (Home Energy Management System) 100.

　電源装置２の入出力接続端子ＩＯ３，ＩＯ４は、インバータ３１および発電装置４０に接続されている。インバータ３１は、電力系統３２および分電盤３３に接続されている。発電装置４０は、ソーラパネル４１およびＰＶコンバータ４２を備えている。ＰＶコンバータ４２は、ソーラパネル４１で発生した電力を定電圧化し、電源装置２またはインバータ３１へ出力する。なお、発電装置４０は、風力発電装置またはガス発電装置等であってもよい。 The input / output connection terminals IO3 and IO4 of the power supply device 2 are connected to the inverter 31 and the power generation device 40. The inverter 31 is connected to the power system 32 and the distribution board 33. The power generation device 40 includes a solar panel 41 and a PV converter 42. The PV converter 42 converts the electric power generated in the solar panel 41 to a constant voltage and outputs it to the power supply device 2 or the inverter 31. The power generation device 40 may be a wind power generation device or a gas power generation device.

　電源装置２は、発電装置４０で発電された電力を蓄電池Ｂ１へ蓄電する。また、電源装置２は、電力系統３２から買電した電力を、インバータ３１を介して入出力接続端子ＩＯ３，ＩＯ４から入力し、蓄電池Ｂ１に充電する。さらに、電源装置１は、蓄電池Ｂ１に蓄電された電圧を入出力接続端子ＩＯ１，ＩＯ２から入力し、インバータ３１へ出力する。 The power supply device 2 stores the electric power generated by the power generation device 40 in the storage battery B1. Moreover, the power supply device 2 inputs the electric power purchased from the electric power grid | system 32 from the input / output connection terminals IO3 and IO4 via the inverter 31, and charges the storage battery B1. Furthermore, the power supply device 1 inputs the voltage stored in the storage battery B <b> 1 from the input / output connection terminals IO <b> 1 and IO <b> 2 and outputs it to the inverter 31.

　本実施形態に係る電源装置２は、実施形態１に係る電源装置１の構成に加え、ＬＬＣ共振コンバータ２０を備えている。ＬＬＣ共振コンバータ２０は、スイッチング回路２１，２２およびトランスＴを備えている。スイッチング回路２１，２２は、不図示の制御回路によりスイッチング制御される。 The power supply device 2 according to the present embodiment includes an LLC resonant converter 20 in addition to the configuration of the power supply device 1 according to the first embodiment. The LLC resonant converter 20 includes switching circuits 21 and 22 and a transformer T. The switching circuits 21 and 22 are switching-controlled by a control circuit (not shown).

　スイッチング回路２１は、スイッチング素子Ｑ３１，Ｑ３２の直列回路と、スイッチング素子Ｑ３３，Ｑ３４の直列回路とで構成されている。トランスＴの結合コイルＮ１は、スイッチング素子Ｑ３１，Ｑ３２の接続点と、スイッチング素子Ｑ３３，Ｑ３４の接続点とに接続されている。 The switching circuit 21 includes a series circuit of switching elements Q31 and Q32 and a series circuit of switching elements Q33 and Q34. The coupling coil N1 of the transformer T is connected to a connection point between the switching elements Q31 and Q32 and a connection point between the switching elements Q33 and Q34.

　スイッチング回路２２は、スイッチング素子Ｑ４１，Ｑ４２の直列回路と、スイッチング素子Ｑ４３，Ｑ４４の直列回路とで構成されている。トランスＴの結合コイルＮ２は、スイッチング素子Ｑ４１，Ｑ４２の接続点と、スイッチング素子Ｑ４３，Ｑ４４の接続点とに接続されている。スイッチング回路２２には、キャパシタＣ３が接続されている。 The switching circuit 22 includes a series circuit of switching elements Q41 and Q42 and a series circuit of switching elements Q43 and Q44. The coupling coil N2 of the transformer T is connected to a connection point between the switching elements Q41 and Q42 and a connection point between the switching elements Q43 and Q44. A capacitor C3 is connected to the switching circuit 22.

　また、トランスＴの結合コイルＮ１と、スイッチング回路２１との間には、キャパシタＣ２とインダクタＬ２とが接続されている。キャパシタＣ２とインダクタＬ２とは、結合コイルＮ１と共にＬＬＣ共振回路を形成している。なお、インダクタＬ２はトランスＴの漏れインダクタンスであってもよく、この場合、キャパシタＣ２と、漏れインダクタンスと、トランスＴの励磁インダクタンスとでＬＬＣ共振回路を形成する。 Further, a capacitor C2 and an inductor L2 are connected between the coupling coil N1 of the transformer T and the switching circuit 21. The capacitor C2 and the inductor L2 form an LLC resonance circuit together with the coupling coil N1. The inductor L2 may be a leakage inductance of the transformer T. In this case, an LLC resonance circuit is formed by the capacitor C2, the leakage inductance, and the exciting inductance of the transformer T.

　ＬＬＣ共振コンバータ２０の電力変換効率は、スイッチング回路２１，２２を５０％ディーティ付近で動作させたときが最も高い。このため、ＤＣ-ＤＣコンバータ１０で出力電圧（ＬＬＣ共振コンバータ２０の入力電圧）を制御することで、ＬＬＣ共振コンバータ２０における電力変換効率を高い状態で動作させることができる。また、蓄電池Ｂ１と、発電装置４０およびインバータ３１とが接続される直流電圧バスとの間を絶縁することができる。 The power conversion efficiency of the LLC resonant converter 20 is highest when the switching circuits 21 and 22 are operated near 50% duty. For this reason, by controlling the output voltage (input voltage of the LLC resonant converter 20) by the DC-DC converter 10, the power conversion efficiency in the LLC resonant converter 20 can be operated in a high state. Further, it is possible to insulate between the storage battery B1 and a DC voltage bus to which the power generation device 40 and the inverter 31 are connected.

　本実施形態に係る電源装置２は、実施形態１と同様に、不図示の制御回路により、蓄電池Ｂ１の逆接続を検出することができる。これにより、蓄電池Ｂ１の逆接続による影響を抑制できる。蓄電池Ｂ１の逆接続の検出については、実施形態１と同じであるため、説明は省略する。 The power supply device 2 according to the present embodiment can detect reverse connection of the storage battery B1 by a control circuit (not shown) as in the first embodiment. Thereby, the influence by reverse connection of storage battery B1 can be suppressed. The detection of the reverse connection of the storage battery B1 is the same as that in the first embodiment, and thus the description thereof is omitted.

Ｂ１…蓄電池
Ｃ１…電解コンデンサ
Ｃ２…キャパシタ
Ｃ３…キャパシタ
Ｄ１…ダイオード
ＩＯ１，ＩＯ２，ＩＯ３，ＩＯ４…入出力接続端子
Ｌ１，Ｌ２…インダクタ
Ｎ１，Ｎ２…結合コイル
Ｑ１，Ｑ２…スイッチング素子
Ｑ３１，Ｑ３２，Ｑ３３，Ｑ３４…スイッチング素子
Ｑ４１，Ｑ４２，Ｑ４３，Ｑ４４…スイッチング素子
Ｒ１…抵抗
Ｒ２１，Ｒ２２…抵抗
Ｒｙ１，Ｒｙ２，Ｒｙ３…リレー
Ｔ…トランス
Ｘ１…操作コイル
Ｘ１，Ｘ２，Ｘ３…操作コイル
１，２…電源装置
１０…ＤＣ－ＤＣコンバータ
１１…直列回路
１２…制御回路
２０…ＬＬＣ共振コンバータ
２１，２２…スイッチング回路
３１…インバータ
３２…電力系統
３３…分電盤
４０…発電装置
４１…ソーラパネル
４２…ＰＶコンバータ
１００…ＨＥＭＳ
１２１…電圧検出部
１２２…逆接続判定部
１２３…リレー制御部
１２４…エラー報知部 B1 ... Storage battery C1 ... Electrolytic capacitor C2 ... Capacitor C3 ... Capacitor D1 ... Diodes IO1, IO2, IO3, IO4 ... Input / output connection terminals L1, L2 ... Inductors N1, N2 ... Coupling coils Q1, Q2 ... Switching elements Q31, Q32, Q33 , Q34 ... switching elements Q41, Q42, Q43, Q44 ... switching element R1 ... resistors R21, R22 ... resistors Ry1, Ry2, Ry3 ... relay T ... transformer X1 ... operation coils X1, X2, X3 ... operation coils 1, 2 ... power supply Device 10 ... DC-DC converter 11 ... Series circuit 12 ... Control circuit 20 ... LLC resonant converters 21, 22 ... Switching circuit 31 ... Inverter 32 ... Power system 33 ... Distribution panel 40 ... Power generation device 41 ... Solar panel 42 ... PV converter 100 ... HEMS
121 ... Voltage detection unit 122 ... Reverse connection determination unit 123 ... Relay control unit 124 ... Error notification unit

Claims (4)

　直流電源が接続される正極側接続端子および負極側接続端子と、
　前記正極側接続端子および前記負極側接続端子に接続されたＤＣ－ＤＣコンバータと、
　前記ＤＣ－ＤＣコンバータの出力電圧を検出する電圧検出部と、
　前記正極側接続端子と前記ＤＣ－ＤＣコンバータとの間に接続された第１リレーと、
　前記負極側接続端子と前記ＤＣ－ＤＣコンバータとの間に接続された第２リレーと、
　前記第１リレーに並列接続された、整流素子、抵抗素子および第３リレーの直列回路と、
　前記第１リレー、前記第２リレーおよび前記第３リレーがオフの第１状態と、前記第１リレーがオフ、前記第２リレーおよび前記第３リレーがオンの第２状態と、前記第１リレーおよび前記第２リレーがオン、前記第３リレーがオフの第３状態とのいずれかに切り替える制御部と、
　を備え、
　前記制御部は、
　初期状態では前記第１状態にし、所定タイミングで前記第１状態から前記第２状態に切り替え、前記第２状態で前記電圧検出部が検出した電圧が所定値以上である場合、前記第２状態から前記第３状態へと切り替える、
　電源装置。 A positive side connection terminal and a negative side connection terminal to which a DC power supply is connected;
A DC-DC converter connected to the positive electrode side connection terminal and the negative electrode side connection terminal;
A voltage detector for detecting an output voltage of the DC-DC converter;
A first relay connected between the positive electrode side connection terminal and the DC-DC converter;
A second relay connected between the negative electrode side connection terminal and the DC-DC converter;
A series circuit of a rectifying element, a resistance element, and a third relay connected in parallel to the first relay;
The first state in which the first relay, the second relay and the third relay are off, the second state in which the first relay is off, the second relay and the third relay are on, and the first relay And a control unit that switches to a third state in which the second relay is on and the third relay is off;
With
The controller is
In the initial state, the first state is set, the first state is switched to the second state at a predetermined timing, and the voltage detected by the voltage detection unit in the second state is equal to or higher than a predetermined value. Switching to the third state,
Power supply. 　前記第１リレーは直流リレーであり、前記第２リレーおよび前記第３リレーは交流リレーである、
　請求項１に記載の電源装置。 The first relay is a DC relay, and the second relay and the third relay are AC relays.
The power supply device according to claim 1. 　前記ＤＣ－ＤＣコンバータは昇圧コンバータである、
　請求項１または２に記載の電源装置。 The DC-DC converter is a boost converter.
The power supply device according to claim 1 or 2. 　前記制御部は、
　前記第２状態で前記電圧検出部が検出した電圧が所定値未満である場合、エラーを報知する、
　請求項１から３のいずれかに記載の電源装置。 The controller is
When the voltage detected by the voltage detection unit in the second state is less than a predetermined value, an error is notified,
The power supply device according to claim 1.
PCT/JP2016/052074 2015-03-30 2016-01-26 Power supply device Ceased WO2016157962A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-067953 2015-03-30
JP2015067953 2015-03-30

Publications (1)

Publication Number Publication Date
WO2016157962A1 true WO2016157962A1 (en) 2016-10-06

Family

ID=57004944

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/052074 Ceased WO2016157962A1 (en) 2015-03-30 2016-01-26 Power supply device

Country Status (1)

Country Link
WO (1) WO2016157962A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107478947A (en) * 2017-08-16 2017-12-15 艾德克斯电子（南京）有限公司 A kind of SENSE is anti-reverse or the method missed
WO2019054138A1 (en) * 2017-09-15 2019-03-21 株式会社村田製作所 Step-up/down device for power storage device and power storage device
JP2021197868A (en) * 2020-06-17 2021-12-27 ニチコン株式会社 Power storage system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005318690A (en) * 2004-04-27 2005-11-10 Sanyo Electric Co Ltd Inverter module
JP2008167620A (en) * 2007-01-04 2008-07-17 Toyota Motor Corp Vehicle power supply device and vehicle
JP2014138473A (en) * 2013-01-16 2014-07-28 Toyota Motor Corp Electrical power system and vehicle equipped with the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005318690A (en) * 2004-04-27 2005-11-10 Sanyo Electric Co Ltd Inverter module
JP2008167620A (en) * 2007-01-04 2008-07-17 Toyota Motor Corp Vehicle power supply device and vehicle
JP2014138473A (en) * 2013-01-16 2014-07-28 Toyota Motor Corp Electrical power system and vehicle equipped with the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107478947A (en) * 2017-08-16 2017-12-15 艾德克斯电子（南京）有限公司 A kind of SENSE is anti-reverse or the method missed
WO2019054138A1 (en) * 2017-09-15 2019-03-21 株式会社村田製作所 Step-up/down device for power storage device and power storage device
JPWO2019054138A1 (en) * 2017-09-15 2020-07-09 株式会社村田製作所 Buck-boost device for power storage device and power storage device
US10826318B2 (en) 2017-09-15 2020-11-03 Murata Manufacturing Co., Ltd. Voltage increasing and decreasing device for power storage apparatus and power storage apparatus
JP2021197868A (en) * 2020-06-17 2021-12-27 ニチコン株式会社 Power storage system
JP7405704B2 (en) 2020-06-17 2023-12-26 ニチコン株式会社 Energy storage system

Similar Documents

Publication Publication Date Title
JP5486604B2 (en) Uninterruptible power system
CN111226364B (en) Power supply device, power control device, and relay determination method for power supply device
US20190237994A1 (en) Uninterruptible power supply
JP6300664B2 (en) Railway vehicle power circuit
US20150084580A1 (en) Power-supply device
US20130264879A1 (en) Low power consumption backup power system
JP6711466B2 (en) Buck-boost device for power storage device and power storage device
JP2015173524A (en) Charger
WO2016157962A1 (en) Power supply device
JP5668692B2 (en) PFC converter
JP2014171313A (en) Dc/dc converter
JP6962379B2 (en) Power storage device
JP4138497B2 (en) Power factor improvement method for power supply system, power supply system, switching power supply device and uninterruptible power supply device
JP2015104299A (en) In-vehicle voltage conversion device and in-vehicle device
JP2015104298A (en) In-vehicle voltage conversion device and in-vehicle device
JP5177438B2 (en) Voltage drop protection device for DC power supply
JP2011205811A (en) Power supply device, discharge lamp lighting device equipped with the same and lighting fixture provided with the discharge lamp lighting device
JP6682003B2 (en) Power converter
JP6593705B2 (en) Voltage converter
JP4721937B2 (en) Discharge lamp lighting device
JP2006311726A (en) Instantaneous voltage drop compensation device
JP2016082710A (en) Solar power generation system
JP2017093100A (en) Power supply system
JP2005269753A (en) Voltage drop protector
JP2013233082A (en) Power supply device system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16771847

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16771847

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP