JP2003274573A - Power unit and uninterruptible power unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable an uninterruptible power unit and a power unit to be connected by one touch, and further to enable the use of the uninterruptible power unit, even if battery voltage exceeds a specified voltage, and to reduce the influence of a rush current on the load. <P>SOLUTION: The power units 1-3 and the uninterruptible power unit 4 are connected with each other with connectors 17B-1 and 17B-2 on DC side and connectors 17A-1 and 17A-2 on DC input side so that the DC bus line of the uninterruptible power unit 4 and the DC output bus line of the power units 1-3 can be connected with each other by one touch, and the uninterruptible power unit is provided with an output voltage control circuit, which controls the output voltage of the load and a rush current control circuit which controls the rush current to the load. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply unit and an uninterruptible power supply unit including a power supply unit and an uninterruptible power supply unit (UPS) for backing up the power supply unit.

[0002]

2. Description of the Related Art Conventionally, when constructing a power supply system having a backup function using a battery, as shown in FIG. 13, DC output terminals 80A-1, 80 of a power supply device 80 are provided.
A-2 and DC input terminal 81A- of uninterruptible power supply 81
It was necessary to externally wire 1, 81A-2. In addition,
In the figure, 82 is a battery, 83 is a load, and 84 is an external AC power supply.

[0003]

As described above, when the power supply system is constructed, the DC output terminal 8 of the power supply device 80 is used.
0A-1, 80A-2 and the DC input terminals 81A-1, 81A-2 of the uninterruptible power supply 81 need to be externally wired, which requires a lot of man-hours for the wiring.

In addition, as a battery for power backup,
For example, when a 27.4V lead-acid battery is used, 27.4V is applied to the load when the power source is backed up. If such a battery is used, the maximum input voltage is 2
It is not possible to connect a load of 7.4 V or less. This limits the types of loads that can be used by connecting to the uninterruptible power supply unit. On the other hand, if the backup voltage is adjusted to the maximum input voltage of the load, the types of batteries that can be used in the uninterruptible power supply unit are limited, and the usability is reduced. In addition, when the battery is charged at a low voltage, for example, 26.4 V according to the maximum input voltage of the load, there is also a problem that the capacity decreases due to repeated charging and discharging.

Therefore, it is desired that even a battery whose battery voltage exceeds the required voltage, for example, the maximum input voltage of the load, can be used by being built in the uninterruptible power supply unit.

Further, the power supply backup is performed when the output voltage drops below a predetermined voltage as in the case of a power failure, so it is performed even when the output voltage drops due to an overload other than during a power failure. And the power backup is continued when the output voltage is reduced,
When the output voltage recovers as expected, it will stop. By the way, in case of output voltage drop due to overload,
If the output voltage returns to a specified value and the power backup stops when the power backup stops, unless the overload is eliminated,
The output voltage drops again, and the power supply backup is repeated again.

In this case, when the power source is backed up, an inrush current corresponding to the voltage difference between the battery voltage and the output voltage flows into the load. However, unlike a power failure, in the case of an overload, the inrush current is repeated by repeating the above power source backup. Repeatedly flows into the load. If such an inrush current repeatedly flows, the load is unfavorably affected.

Therefore, it is desired to reduce the influence on the load due to the inrush current at the time of power source backup.

The present invention has been made by paying attention to the above problems, and an object thereof is to make one-touch operation between a DC bus line of an uninterruptible power supply unit and a DC output bus line of each power supply unit. The main purpose is to provide a power supply unit and an uninterruptible power supply unit that can be connected with a power supply unit and an uninterruptible power supply unit without the need for wiring, and the battery voltage can be saved. Is intended to be used in the uninterruptible power supply unit even if the voltage exceeds the required voltage, or to reduce the influence of inrush current on the load.

[0010]

In order to achieve the above-mentioned object, the present invention is constructed as follows.

That is, the power supply device of the present invention is a power supply device including a power supply unit and an uninterruptible power supply unit, wherein the power supply unit converts an alternating current input from the outside into a direct current by its built-in power supply circuit. And a DC output bus line for outputting and a power supply unit side connector connected to the DC output bus line, wherein the uninterruptible power supply unit is connected to the built-in DC bus line and the DC bus line, and An uninterruptible power supply unit side connector to which the power supply unit side connector is detachably coupled, and a battery voltage supply circuit that supplies the voltage from the battery as an output voltage to the load when the power supply is backed up, and an output to the load. And an output voltage suppression circuit that suppresses the voltage to a required voltage or less.

According to the present invention, the power supply unit and the uninterruptible power supply unit are connected by the power supply unit side connector and the uninterruptible power supply unit side connector, and the DC bus line of the uninterruptible power supply unit and the DC output of each power supply unit are connected. Since the bus line can be connected with one touch, wiring between the power supply unit and the uninterruptible power supply unit becomes unnecessary, and the man-hours are saved accordingly.

Further, when the power supply is backed up, the output voltage to the load is suppressed to a required voltage or less, so that an excessive voltage is not applied to the load when the power supply is backed up.

According to one embodiment of the present invention, there is provided a power supply device including a power supply unit and an uninterruptible power supply unit, wherein the power supply unit converts an alternating current input from the outside into a direct current by its built-in power supply circuit. And a DC output bus line for outputting and a power supply unit side connector connected to the DC output bus line, wherein the uninterruptible power supply unit is connected to the built-in DC bus line and the DC bus line, and An uninterruptible power supply unit side connector to which the power supply unit side connector is detachably coupled, and a battery voltage supply circuit that supplies a voltage from a battery to a load when the power source is backed up, and the battery voltage supply circuit to the load. And an inrush current suppressing circuit for suppressing the magnitude of the inrush current.

According to the present invention, the wiring between the power supply unit and the uninterruptible power supply unit is not required, and the number of man-hours is reduced accordingly, and the inrush current from the battery voltage supply circuit to the load can be reduced when the power supply is backed up. Because it controls the size,
The influence of the inrush current on the load can be reduced.

In another embodiment of the present invention, there is provided a power supply device including a power supply unit and an uninterruptible power supply unit, wherein the power supply unit converts an alternating current input from the outside into a direct current into a direct current. It has a DC output bus line for converting and outputting, and a power supply unit side connector connected to the DC output bus line, and the uninterruptible power supply unit is connected to the built-in DC bus line and the DC bus line. And a connector for connecting the power supply unit side to an uninterruptible power supply unit side that is detachably coupled, and a battery voltage supply circuit that supplies the voltage from the battery to the load when the power supply is backed up, and a switch to the power supply backup. From the power supply backup state holding circuit for holding the power supply backup state for a required period.

According to the present invention, the wiring between the power supply unit and the uninterruptible power supply unit becomes unnecessary, the man-hours are saved accordingly, and the power supply backup for supplying the voltage from the battery to the load is switched. , Power supply backup status is maintained for the required period, so after power supply backup,
Even if the output voltage recovers as expected, the power supply backup state will be continued, and as a result, the power supply backup will be repeated due to overload, etc., and the number of times the inrush current repeatedly flows to the load will be suppressed. You can

A preferred embodiment of the present invention may have a configuration including an inrush current suppressing circuit and an output voltage suppressing circuit, or a power supply backup state holding circuit and an output voltage suppressing circuit.

According to the present invention, it is possible to reduce the influence on the load due to the inrush current at the time of backing up the power supply, and to prevent an excessive voltage from being applied to the load.

In another embodiment of the present invention, the uninterruptible power supply unit includes a stopping means for forcibly stopping the power supply backup, and an operation mode output for outputting an operation mode of the power supply backup state or the normal state. Means, means for detecting and reporting an abnormality in the connection of the battery, or battery state output means for outputting the state of the battery may be provided.

According to the present invention, when the backup operation is started and the necessary processing is completed, the backup state can be forcibly stopped by the stopping means,
You can extend battery life by turning off unnecessary backups. With the operation mode output means, the operation state can be grasped from the outside. When an abnormality in the battery connection is detected, a notification is given, so that an incorrect connection can be recognized and a normal connection can be made. Further, the battery state output means can grasp the state of the battery.

The uninterruptible power supply unit of the present invention comprises an uninterruptible power supply unit side connector to which a power supply unit side connector connected to a DC output bus line of the power supply unit is detachably coupled, and an uninterruptible power supply unit side connector. An uninterruptible power supply unit including a connected DC bus line, wherein a battery voltage supply circuit that supplies a voltage from a battery as an output voltage to a load at the time of power source backup, and an output voltage to the load are equal to or lower than a required voltage. And an output voltage suppression circuit.

According to the present invention, the power supply unit and the uninterruptible power supply unit are coupled by the power supply unit side connector and the uninterruptible power supply unit side connector, and the DC bus line of the uninterruptible power supply unit and the DC output of each power supply unit. Since the bus line can be connected with one touch, wiring between the power supply unit and the uninterruptible power supply unit becomes unnecessary, and the man-hours are saved accordingly. Also, when performing power backup, the output voltage to the load is suppressed below the required voltage.
Excessive voltage is not applied to the load when the power is backed up.

In one embodiment of the present invention, an uninterruptible power supply unit side connector to which a power supply unit side connector connected to a DC output bus line of a power supply unit is detachably coupled, and an uninterruptible power supply unit side connector An uninterruptible power supply unit including a connected DC bus line, wherein a battery voltage supply circuit that supplies a voltage from a battery to a load and a magnitude of an inrush current from the battery voltage supply circuit to the load when the power supply is backed up And an inrush current suppressing circuit that suppresses

According to the present invention, the wiring between the power supply unit and the uninterruptible power supply unit is not required, the number of man-hours is reduced accordingly, and the inrush current from the battery voltage supply circuit to the load can be reduced when the power is backed up. Because it controls the size,
The influence of the inrush current on the load can be reduced.

In another embodiment of the present invention, an uninterruptible power supply unit side connector to which a power supply unit side connector connected to a DC output bus line of a power supply unit is detachably connected, and the uninterruptible power supply unit side connector. An uninterruptible power supply unit including a DC bus line connected to a battery voltage supply circuit that supplies a voltage from a battery to a load during power backup, and a power backup state for a required period after switching to power backup. And a power supply backup state holding circuit for holding

According to the present invention, the wiring between the power supply unit and the uninterruptible power supply unit becomes unnecessary, the man-hours are reduced accordingly, and the power supply backup for supplying the voltage from the battery to the load is switched. , Power supply backup status is maintained for the required period, so after power supply backup,
Even if the output voltage recovers as expected, the power supply backup state will be continued, and this will reduce the number of times the power supply backup will be repeated due to overload and the like, and the inrush current will repeatedly flow to the load. be able to.

A preferred embodiment of the present invention may have a configuration having an inrush current suppressing circuit and an output voltage suppressing circuit, or a power supply backup state holding circuit and an output voltage suppressing circuit.

According to the present invention, it is possible to reduce the influence on the load due to the inrush current at the time of backing up the power supply, and to prevent an excessive voltage from being applied to the load.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

(Embodiment 1) FIGS. 1 to 3 show Embodiment 1 of a power supply device according to the present invention.

FIG. 1 is a structural explanatory view of a first embodiment of a power supply device according to the present invention, FIG. 2 is a structural explanatory view of a power supply circuit of a power supply unit in the same power supply device, and FIG. 3 is an uninterruptible power supply unit in the same power supply device. FIG.

In these figures, 1 is a first power supply unit, 2 is a second power supply unit, 3 is a third power supply unit, and 4 is an uninterruptible power supply unit (UPS). The first power supply unit 1 and the second power supply unit 2, and the second power supply unit 2 and the third power supply unit 3 are connected to the internal bus lines by connectors to form a module power supply. .

The module power supply is the same as the above-mentioned three.
The present invention is not limited to the single power supply units 1, 2, and 3, and is configured by connecting a single power supply unit or a plurality of power supply units with a bus line included therein.

The first power supply unit 1 has a required power circuit component built in a rectangular parallelepiped casing (not shown) whose front panel shape is a vertically long rectangular shape.
100 ~ 240VAC input, 24VDC output, 2.5
A, a switching power supply for 60 W output.

The power supply circuit 9 and the AC input terminals 5-1 and 5 are provided in the first, second and third power supply units 1, 2 and 3.
-2, DC output terminals 6-1, 6-2, AC input bus lines (bus lines) (Vin +), (Vin-), and DC output bus lines (bus lines) (Vo +) (Vo-) are installed. I am doing it.

The AC input terminals 5-1 and 5-2 are arranged on the front panel (not shown) and are 100 to 240 VAC.
Of the external commercial alternating current to the power supply circuit 9 and is connected to the alternating current input bus lines (Vin +) and (Vin−). Also. The DC output terminals 6-1 and 6-2 are arranged at the lower part of the front panel and output 24 VDC.
There are two plus sides + and two minus sides, and one plus side and one minus side are paired to form two pairs of DC output terminals.

The DC output terminal 6-1 (plus side +) is connected to the DC output bus line (Vo +), and the DC output terminal 6-2 (minus side −) is connected to the DC output bus line (Vo).
-).

The power supply circuit 9 has AC input terminals 5-1 and 5-.
Stabilized AC input from outside via 2
DC output terminals 6-1, 6 converted to 4VDC output voltage
Is output to the outside via -2, and this power supply circuit 9 is, for example, a switching power supply circuit,
As shown in FIG. 2, the external commercial AC is rectified by the input voltage rectifier circuit 7 and the input smoothing capacitor 8A to obtain a DC voltage, and this DC voltage is switched by the switching element 13 to be converted into a high frequency pulse. The high frequency pulse is transformed by the high frequency transformer 10 and is returned to the direct current by the high frequency rectification circuit 11 and the output smoothing capacitor 8B. When the output voltage fluctuates, the control circuit 12
The constant voltage control is performed by changing the pulse width or the switching frequency when the switching element 13 switches.

The input side of the power supply circuit 9 is connected to the AC input bus lines (Vin +) and (Vin-),
In addition, the output side of the power supply circuit 9 is a DC output bus line (Vo
+) (Vo-).

As shown in FIG. 1, the first, second, and third power supply units 1, 2, and 3 have AC input side connectors 16A-1 and 16A-2 on one side panel side thereof.
And DC input side connectors 17A-1 and 17A-2, and AC output side connectors 16B-1 and 16B-2 and DC output side connector 17B on the other side panel side.
-1, 17B-2, and AC input side connectors 16A-1, 16A-2 and AC output side connector 16B-.
1, 16B-2 and AC input bus line (Vin +),
They are connected to each other via (Vin−), and the DC input side connectors 17A-1, 17A-2 and the DC output side connectors 17B-1, 17B-2 are connected to the DC output bus line (Vo).
+) (Vo-).

The uninterruptible power supply (UPS) 4 is shown in FIG.
Backup circuit 20, battery connection terminals 21-1, 21-2, and DC output terminals 22-1, 22-2.
2 and DC input terminal connectors 23-1 and 23-2 which are power supply unit side connectors. A battery 24 is connected to the battery connection terminals 21-1 and 21-2.

The backup circuit 20 has a DC bus line 40, a charging circuit 41, and a discharging circuit 42 as a battery voltage supply circuit for supplying the voltage from the battery 24 to the load 25 during backup. The DC bus line 40 includes a line 31 connecting the DC input side connector 23-1 and the DC output terminal 22-1 and a line 32 connecting the DC input side connector 23-2 and the DC output terminal 22-2. Have a diode D on line 31
1 is provided.

The charging circuit 41 is a step-up / down conversion circuit,
A transformer T, a switch element Q1 connected in series with the primary coil of the transformer T, a capacitor C1 connected in parallel with the primary coil of the transformer T, and a diode D2 connected in series with the secondary coil of the transformer T. Transformer T
And a capacitor C2 connected in parallel to the secondary coil of. This step-up / step-down conversion circuit is a circuit that takes out this electric energy to the output when the switch element Q1 is off, and performs step-up / step-down conversion by controlling the switch element Q1.

The input side of the charging circuit 41 is connected to the DC input side connectors 23-1 and 23-2, and the output side of the charging circuit 41 is the battery connecting terminals 21-1 and 21-2.
Connected to.

The input side of the discharge circuit 42 is connected to the battery connection terminal 21-1, and the output side of the discharge circuit 42 is connected to the DC output terminal 22-1, respectively. The discharge circuit 42 includes a switch element Q2 and a diode D3. have.

The detection lines 29, 30 are led out from the output side of the charging circuit 41, and the detection line 29 is provided with a variable current limit means 33 for setting the upper limit of the charge of the battery 24 by the user. The detection line 30 is provided with overvoltage protection means 34.

From the input side of the charging circuit 41 to the detection line 35
The voltage drop detection means 37 is provided on the detection line 35, and the detection lines 36A and 36B are derived from the discharge circuit 42, respectively, and the overdischarge prevention means 38A is provided on the detection line 36A. But the detection line 3
6B is provided with overcurrent protection means 38B and inrush current suppression circuit 46, respectively.

In this embodiment, an output voltage suppressing circuit 45 for suppressing the output voltage to the load 25 connected to the DC output terminals 22-1 and 22-2 to a voltage equal to or lower than a required voltage when the power source is backed up is provided. An excessive voltage is prevented from being applied to the load 25 when the power source is backed up.

Furthermore, in this embodiment, in the case of overload, the inrush current is increased by repeating the power source backup.
The inrush current suppressing circuit 46 described above is provided in order to reduce the repetitive flow of the electric current to the No. 5 circuit.

In this embodiment, the backup ON / OF circuit is used as a stopping means for forcibly stopping the backup after the necessary operation is completed and the backup is no longer needed after the backup operation is started. 5
5 is provided.

The first, second, third power supply units 1, 2, 3 and the uninterruptible power supply unit (UPS) 4 are mounted on a din rail (not shown) and are arranged in parallel in this order, for example. It is connected.

That is, as shown in FIG. 1, to the right of the first power supply unit 1, the second and third power supply units 2,
3 and an uninterruptible power supply unit (UPS) 4 are arranged in this order, and AC output side connectors 16B-1 and 16B-2 of the first power supply unit 1 and a DC output side connector 17B.
-1, 17B-2 are connected to the AC input side connectors 16A-1, 16A-2 and the DC input side connectors 17A-1, 17A-2 of the second power supply unit 2, respectively.

The DC output side connectors 17B-1 and 17B-2 of the third power supply unit 3 are the DC input side connectors 23-1 and 23- of the uninterruptible power supply unit (UPS) 4.
It is connected to 2.

Therefore, the individual AC input bus lines (Vin) of the first, second and third power supply units 1, 2, 3
+) And (Vin−) are connected in this order to form a single unit, and the first, second, and third power supply units 1,
A few individual DC output bus lines (Vo +), (Vo +
-) Are integrated in this order.

The AC input terminals 5-1 and 5-2 of the first power supply unit 1 are connected to the external commercial AC power supply 39, and the DC output terminal 22-1 of the uninterruptible power supply unit (UPS) 4 is connected. , 22-2 are connected to the load 25 as described above.

Next, the operation of the power supply device according to the present invention will be described.

AC input terminal 5- of the first power supply unit 1
As a result that the alternating current input from 1, 5-2 is supplied to each of the second and third power supply units 2 and 3, as a result, the DC output terminals 6-1 and 6-2 of the power supply units 1, 2, and 3 are DC can be output individually from each, and if a load is connected to the DC output terminals 6-1 and 6-2 of each power supply unit 1, 2, and 3, DC can be output to this load. .

The direct current converted from the alternating current by the power supply circuit 9 is connected to the direct current input side connectors 23-1 and 23-2 of the uninterruptible power supply unit (UPS) 4 through the direct current output bus lines (Vo +) and (Vo-). It is supplied to the incoming backup circuit 20.

Normally, the direct current supplied to the direct current input side connectors 23-1 and 23-2 in the uninterruptible power supply unit (UPS) 4 passes through the direct current bus line 40 and the direct current output terminal 22.
-1, 22-2 is supplied to the load 25, and the direct current supplied to the DC input side connectors 23-1, 23-2 is stepped up and down in the charging circuit 41, and the battery connection terminal 2
The battery 24 is charged through 1-1 and 21-2.

In this case, the variable current limit means 33
The upper limit to which the battery 24 can be charged is regulated, and when the upper limit is reached, the variable current limit means 33 causes the switch element Q1.
Is controlled so that the charging current does not flow above the upper limit current value. Further, when the output of the charging circuit 41 becomes high, the overvoltage protection means 34 operates to control the switch element Q1 to make charging impossible.

When a power failure occurs or a peak load exceeding the rated load of the power supply system occurs, the input voltage of the charging circuit 41 drops. This voltage drop is detected by the voltage drop detection means 37, and this voltage drop means 37 is detected.
Deactivates the charging circuit 41, and the voltage drop detecting means 37 turns on the switch element Q2 of the discharging circuit 42. Therefore, the discharge circuit 42 is closed and the direct current from the battery 24 is supplied to the load 25 to cope with a power failure or a peak load.

Further, when the discharge from the battery 25 is in the over-discharged state, the over-discharge preventing means 38A operates, and the over-discharge preventing means 38A turns off the switch element Q2. Therefore, the discharge circuit 42 is opened to prevent over discharge. In addition, the overcurrent protection means 38B regulates the upper limit to which the battery 24 can discharge.

In this embodiment, as described above, the output voltage suppressing circuit 45 for suppressing the output voltage to the load 25 to the required voltage or less when the power source is backed up is provided, and an excessive voltage is applied to the load 25 when the power source is backed up. It is not applied.

FIG. 4 is a block diagram of the output voltage suppressing circuit 45. The output voltage suppression circuit 45, as a circuit block, outputs voltage to the load 25 based on the output of the output voltage detection circuit 47, which compares the output voltage to the load 25 with the reference voltage and detects the output voltage. And an output voltage adjusting circuit 48 for adjusting.

The output voltage detecting circuit 47 includes a voltage dividing circuit and an error amplifying circuit. The voltage dividing circuit is composed of two voltage dividing resistors R1 and R2 connected in series, divides the output voltage to a level required for detecting the output voltage, and outputs the voltage from the common connection portion of the two voltage dividing resistors R1 and R2. Outputs voltage detection output. The output of this voltage dividing circuit corresponds to the output voltage to the load 25, but this voltage dividing circuit is not necessarily an essential component and may be omitted. That is, the output voltage itself may be used as the detection output.

The error amplifier circuit includes an error amplifier 49 and a resistor R4 and capacitors C3 and C4 connected between the input and output of the error amplifier 49. Error amplifier 49
Is a reference voltage applied to the inverting input via a resistor R3,
Further, the voltage divider circuit output is applied to the non-inverting input. The error amplifier 49 error-amplifies an error between the output voltage divided by the voltage dividing circuit and the reference voltage. The reference voltage is set so that the output voltage is equal to or lower than the maximum input voltage of the load 25. The error amplifier circuit outputs an error component between the reference voltage and the output voltage as an error voltage.

The output voltage adjusting circuit 48 includes a pulse voltage generating circuit 50, two voltage dividing resistors R5 and R6, a current limiting resistor R7, a biasing resistor R8, a primary coil voltage controlling transistor Tr1, and an insulating element. Transformer T2,
It includes a rectifying diode D4 and a gate bias resistor R9. The pulse voltage generation circuit 50 oscillates and outputs a voltage pulse at a predetermined frequency. Both voltage dividing resistors R5 and R6 are connected in series between the pulse voltage generating circuit 50 and the collector of the transistor Tr1. Transistor Tr1
Has its base connected to the output of the error amplifier 49 via the current limiting resistor R7 and changes the collector-emitter voltage in response to the error voltage. Therefore, a pulse voltage having a level corresponding to the error voltage is applied from the connection point of the voltage dividing resistors R5 and R6 to one end of the primary coil of the transformer T2.

Voltage across the primary coil of transformer T2
The magnitude of the (primary coil voltage) changes according to the voltage change at the connection point of the voltage dividing resistors R5 and R6, and along with this, the voltage across the secondary coil of the transformer T2 (secondary coil voltage).
Also changes. The secondary coil voltage of the transformer T2 is rectified by the rectifying diode D4 and given to the gate resistor R9. As a result, the switch element Q2 formed of the MOSFET is driven by the voltage across the gate resistor R9. In this case, this MOSFET functions as an element for adjusting the output voltage, and its source / drain voltage has a voltage value corresponding to its gate voltage.

The output voltage suppressing circuit 45 having the above structure
Then, when the battery voltage is, for example, 27.4 V and the maximum input voltage of the load 25 is 26.4 V, the error amplifier 4
The reference voltage of 9 is set to the reference voltage corresponding to 26.4V. Therefore, the output voltage detection circuit 47 outputs an error voltage corresponding to the error between the output voltage and the maximum input voltage of the load 25. Since the output voltage adjusting circuit 48 drives the switch element Q2 with the gate voltage corresponding to this error voltage, the battery voltage 27.4V is dropped by the source / drain voltage 1.0V of the switch element Q2. , 26.4V will be supplied to the load. In this case, the forward voltage Vf of the diode D3 is ignored, but if this is taken into consideration, it is advisable to set and control the reference voltage so as to further increase the source / drain voltage of the switch element Q2.

In this embodiment, the output voltage to the load 25 is detected, but as another embodiment of the present invention, as shown in FIG. 5, the voltage of the battery 24 is detected and the same configuration is used. The output voltage to the load 25 may be adjusted.

Further, as shown in FIG. 6 or 7, the error between the output voltage to the load 25 or the voltage of the battery 24 and the reference voltage is amplified by the error amplifier 63, and based on the output of this error amplifier 63. The variable voltage source 64 may control the gate voltage of the switching element Q2 to suppress the output voltage to the load.

In this embodiment, the power supply backup is repeated due to the overload, and inrush current is repeatedly applied to the load 25 to affect the load 25. Therefore, in order to reduce the influence, A current suppressing circuit 46 is provided.

FIG. 8 is a block diagram of the inrush current suppressing circuit 46. The inrush current suppressing circuit 46 of this embodiment is
A current / voltage converter 51 for detecting a discharge current flowing through the discharge circuit 42 and converting it into a voltage, and the current / voltage converter 51.
Error amplifier 5 for amplifying the error between the output voltage of the
2 and a variable voltage source 53 that controls the gate voltage of the switch element Q2 based on the output of the error amplifier 52.

The reference voltage applied to the inverting input of the error amplifier 52 corresponds to a predetermined value for limiting the magnitude of the inrush current.

In the inrush current suppressing circuit 46 of this embodiment, when the magnitude of the discharge current is detected and is larger than a predetermined value, the gate voltage of the switch element Q2 composed of the MOSFET is controlled to make the inrush current equal to or smaller than the predetermined value. It suppresses.

As another embodiment of the present invention, as shown in FIG. 9, the discharge circuit 42 includes a detection resistor R10.
Is inserted, the voltage between both ends thereof is taken into the amplifier 57 via the voltage dividing resistors R11, R12 and the resistor R13 and amplified, and the detection circuit 65 compares and detects it with the reference voltage.
The inrush current may be suppressed to a predetermined value or less by controlling the gate voltage of the switch element Q2 with 6. The configurations of the detection circuit 65 and the adjustment circuit 66 are similar to those of the output voltage detection circuit 47 and the output voltage adjustment circuit 48 in FIG. 4 described above, and therefore, corresponding parts are designated by the same reference numerals and the description thereof is omitted. To do.

In the above-described embodiment, the magnitude of the inrush current is suppressed to a predetermined value or less. However, as another embodiment of the present invention, as shown in FIG. When the power backup is generated by the power backup state holding circuit 58, the power backup state may be continued for a required time after that even if the input voltage is recovered as desired.

This power backup state holding circuit 58
Is a voltage obtained by dividing the input voltage V _IN input to the DC input side connector 23-1 by the resistors R14 and R15 to the non-inverting input and the first reference voltage V _REF1 to the inverting input. The comparison amplifier circuit 61, the amplification degree determining resistors R16 and R17, the charging resistor R18 connected in series between the output of the comparison amplifier circuit 61 and the ground, the capacitor C6, and the charging resistor R18 in the reverse direction. Based on the output of this comparison circuit 62, a discharge diode D6 connected to the comparator circuit 62, a comparison circuit 62 connected to the second reference voltage V _REF2, and a non-inverting input connected to the second reference voltage V _REF2. And a drive circuit 79 for controlling ON / OFF of the switch element Q2.

11A and 11B are time charts for explaining the operation of the power supply backup state holding circuit 58. FIG. 11A shows the input voltage, FIG. 11B shows the output of the comparison amplifier circuit 61, and FIG. ) Is an inverting input of the comparison circuit 62, and FIG.

In the power supply backup state holding circuit 58, when the input voltage decreases as shown in FIG. 9A due to a power failure or overload, as shown in FIG. The output also becomes low level, the electric charge accumulated in the capacitor C6 is rapidly discharged through the discharging diode D6, and the inverting input of the comparison circuit 62 also becomes low level and falls below the second reference voltage V _REF2. The output of the comparison circuit 62 becomes a high level, whereby the switch element Q2 is turned on via the drive circuit 79 to start backup.

Next, when the input voltage recovers to the desired value as shown in FIG. 9A, the output of the comparison circuit 61 also becomes high level as shown in FIG. Since the inverting input of 62 is charged in the capacitor C6 via the charging resistor R18 as shown in FIG. 7C, the second reference voltage V is supplied as shown in FIG. _RE
The output of the comparison circuit 62 continues to be at the high level and maintains the backup state until reaching _F2 . This backup state is maintained for a required period, for example, several seconds.

As a result, even if an inrush current flows through the load 25 due to the switching element Q2 being turned on at the beginning of power source backup, the inrush current will not repeatedly flow thereafter. As a result, the load 25
Even if the input voltage drops due to overload, the switching element Q
By turning on and off 2, the inrush current is prevented from repeatedly flowing, and the influence of the inrush current is suppressed.

Further, in this embodiment, when the backup operation is started due to the power failure and the necessary processing is finished in the load 25 and the backup becomes unnecessary, the backup ON / OFF terminals 54-1 and 54-2 are provided. The backup can be forcibly stopped by opening the gap with a relay or transistor. That is, in the backup state, the backup ON / OF circuit 55 has the backup ON / OFF terminal 54-
When the area between 1 and 54-2 becomes open, backup is forcibly stopped. In addition, backup ON /
The OFF terminals 54-1 and 54-2 are short-circuited by a jumper wire at the time of shipping. Also, after backup is stopped, it is turned on by a relay or a transistor.

By stopping unnecessary backups in this way, the battery life can be extended.

(Second Embodiment) FIG. 12 is a structural explanatory view of an uninterruptible power supply unit 4 according to another second embodiment of the present invention, in which parts corresponding to those in FIG. Attach.

The uninterruptible power supply unit of this embodiment is
The output voltage suppressing circuit 45 and the inrush current suppressing circuit 4 described above.
6 and the like, an operation mode output circuit 67, a battery status output circuit 68, and a battery erroneous connection protection circuit 69 are provided.

The operation mode output circuit 67 outputs the operation mode of the backup operation or the normal operation to the outside as the output of the relay 70, while the backup display LED 71 is lit and displayed during the backup operation.

The battery erroneous connection protection circuit 69 confirms the battery connection terminal voltage before starting charging the battery 24 at startup, and if the battery terminal voltage is a predetermined voltage or less, for example, 15.8 V or less, When the battery 24 is reversely connected or the battery is forgotten to be connected, a relay output is output via the battery state output circuit 68 or a battery warning display LED 72 outputs an alarm, and the switch element Q3 shuts off the charging path. When the battery 24 is properly connected by this alarm, the alarm output is stopped and the charging path is turned on.

When the battery connection terminal voltage is 22.6 V or less, the battery status output circuit 68 operates in accordance with the battery protection function operation, the battery ON / OFF signal input open, the overcurrent protection function operation, and the overvoltage protection function operation. When the charging circuit is stopped, the output of the corresponding relay 73 and the lighting of the battery warning display LED 72 are displayed. .

The other structure is similar to that of the above-described embodiment.

[0092]

As described above, according to the present invention, the power supply unit and the uninterruptible power supply unit are coupled by the power supply unit side connector and the uninterruptible power supply unit side connector to form the DC bus line of the uninterruptible power supply unit. Since the DC output bus line of the power supply unit can be connected with one touch, wiring between the power supply unit and the uninterruptible power supply unit becomes unnecessary, and the man-hours are reduced accordingly.

Further, when the power source is backed up, the output voltage to the load is suppressed to the required voltage or less, so that an excessive voltage is not applied to the load when the power source is backed up.

Further, at the time of backing up the power supply, the magnitude of the inrush current from the battery voltage supply circuit to the load is suppressed,
Alternatively, the power supply backup state is continued and the power supply backup is repeated due to an overload or the like, and the number of times the inrush current repeatedly flows to the load is suppressed, so that the influence of the inrush current on the load can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a power supply device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the power supply unit of FIG.

FIG. 3 is a configuration diagram of the uninterruptible power supply unit of FIG. 1.

4 is a configuration diagram of the output voltage suppression circuit of FIG.

FIG. 5 is a diagram showing another example of the output voltage suppression circuit.

FIG. 6 is a diagram showing still another example of the output voltage suppression circuit.

FIG. 7 is a diagram showing another example of the output voltage suppression circuit.

8 is a configuration diagram of the inrush current suppressing circuit of FIG.

FIG. 9 is a diagram showing another example of the inrush current suppressing circuit.

FIG. 10 is a diagram showing a configuration of a power supply backup state holding circuit.

11 is a time chart used for explaining the operation of FIG.

FIG. 12 is a configuration diagram of an uninterruptible power supply system according to another embodiment of the present invention.

FIG. 13 is a configuration diagram of a conventional example.

[Explanation of symbols]

1 to 3 power supply unit 4 uninterruptible power supply unit 5-1 and 5-2 AC input terminals 6-1, 6-2 DC output terminals 16A-1, 16A-2 AC output side connectors 17A-1, 17A-2 DC input Side connectors 17B-1 and 17B-2 DC output side connector 45 Output voltage suppression circuit 46 Inrush current suppression circuit 58 Power supply backup state holding circuit 67 Operation mode output circuit 68 Battery state output circuit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuya Marumoshi             Shiokyo-ku, Kyoto-shi, Kyoto Prefecture             801 Kudo-cho Omron Co., Ltd. F-term (reference) 5G015 FA02 FA04 FA10 GB02 HA15                       JA04 JA32 JA34 JA35 JA52                 5H730 AA13 AS01 AS21 BB43 BB57                       BB82 BB91 CC01 DD04 DD26                       EE02 EE07 FD01 FD21 FD31                       FG01 XX03 XX12 XX13 XX15                       ZZ05 ZZ12

Claims (12)

[Claims] 1. A power supply device comprising a power supply unit and an uninterruptible power supply unit, wherein the power supply unit converts an alternating current input from the outside into a direct current by a built-in power supply circuit and outputs the direct current output bus. And a power supply unit side connector connected to the DC output bus line, wherein the uninterruptible power supply unit is connected to the built-in DC bus line and the power supply unit side connector is connected. It has an uninterruptible power supply unit-side connector that can be detachably coupled, and a battery voltage supply circuit that supplies the voltage from the battery as the output voltage to the load when the power supply is backed up, and the output voltage to the load is suppressed below the required voltage. A power supply device having an output voltage suppression circuit that operates. 2. A power supply device comprising a power supply unit and an uninterruptible power supply unit, wherein the power supply unit converts an alternating current input from the outside into a direct current by a built-in power supply circuit and outputs the direct current output bus. And a power supply unit side connector connected to the DC output bus line, wherein the uninterruptible power supply unit is connected to the built-in DC bus line and the power supply unit side connector is connected. It has an uninterruptible power supply unit side connector that is detachably coupled, and a battery voltage supply circuit that supplies the voltage from the battery to the load when the power supply is backed up and the magnitude of the inrush current from the battery voltage supply circuit to the load. A power supply device comprising: an inrush current suppressing circuit for suppressing. 3. A power supply device comprising a power supply unit and an uninterruptible power supply unit, wherein the power supply unit converts an alternating current input from the outside into a direct current by a built-in power supply circuit and outputs the converted direct current output bus. A line and a power supply unit side connector connected to the DC output bus line, the uninterruptible power supply unit is connected to the built-in DC bus line, the DC bus line, and the power supply unit side connector It has an uninterruptible power supply unit-side connector that is detachably connected, and a battery voltage supply circuit that supplies the voltage from the battery to the load when the power supply is backed up and a power supply backup state for the required period after switching to the power supply backup. A power supply device having a power supply backup state holding circuit for holding the power supply. 4. The power supply device according to claim 2, wherein the uninterruptible power supply unit has an output voltage suppression circuit that suppresses an output voltage of the battery voltage supply circuit to the load to a required voltage or less. apparatus. 5. The power supply device according to claim 1, wherein the uninterruptible power supply unit includes a stop unit for forcibly stopping the power backup. 6. The power supply device according to claim 1, wherein the uninterruptible power supply unit includes an operation mode output unit that outputs an operation mode that is a power supply backup state or a normal state. Power supply. 7. The power supply device according to claim 1, wherein the uninterruptible power supply unit includes means for detecting and notifying an abnormality in connection of the battery. 8. The power supply device according to claim 1, wherein the uninterruptible power supply unit includes a battery status output unit that outputs a status of the battery. 9. An uninterruptible power supply unit side connector to which a power supply unit side connector connected to a DC output bus line of a power supply unit is detachably coupled, and a DC bus line connected to the uninterruptible power supply unit side connector. An uninterruptible power supply unit including a battery voltage supply circuit that supplies a voltage from a battery as an output voltage to a load when the power supply is backed up.
An uninterruptible power supply unit comprising: an output voltage suppressing circuit that suppresses an output voltage to the load to a required voltage or less. 10. An uninterruptible power supply unit side connector to which a power supply unit side connector connected to a DC output bus line of a power supply unit is detachably coupled, and a DC bus line connected to the uninterruptible power supply unit connector. An uninterruptible power supply unit including: a battery voltage supply circuit that supplies a voltage from a battery to a load when the power supply is backed up; and an inrush current suppression circuit that suppresses the magnitude of the inrush current from the battery voltage supply circuit to the load. An uninterruptible power supply unit having: 11. An uninterruptible power supply unit side connector to which a power supply unit side connector connected to a DC output bus line of a power supply unit is detachably coupled, and a DC bus line connected to the uninterruptible power supply unit connector. An uninterruptible power supply unit including: a battery voltage supply circuit that supplies the voltage from the battery to the load when the power is backed up, and a power backup state holding circuit that holds the power backup state for a required period after switching to the power backup. An uninterruptible power supply unit having: 12. The uninterruptible power supply unit according to claim 10 or 11, wherein the uninterruptible power supply unit has an output voltage suppression circuit that suppresses an output voltage of the battery voltage supply circuit to the load to a required voltage or less.