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WO2005117050A1 - Rupteur de courant - Google Patents

Rupteur de courant Download PDF

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Publication number
WO2005117050A1
WO2005117050A1 PCT/JP2005/009096 JP2005009096W WO2005117050A1 WO 2005117050 A1 WO2005117050 A1 WO 2005117050A1 JP 2005009096 W JP2005009096 W JP 2005009096W WO 2005117050 A1 WO2005117050 A1 WO 2005117050A1
Authority
WO
WIPO (PCT)
Prior art keywords
transistor
current
resistor
turned
load
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/JP2005/009096
Other languages
English (en)
Japanese (ja)
Inventor
Hideaki Yoshimura
Heihachiro Yagami
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
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 Pioneer Corp filed Critical Pioneer Corp
Publication of WO2005117050A1 publication Critical patent/WO2005117050A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications

Definitions

  • the present invention relates to a current interrupt device that interrupts an excessive current that adversely affects an electronic circuit, an electronic device, and the like.
  • the current interrupting device shown in Fig. 1 (a) is a control device for setting the base potential of the positive temperature coefficient thermistor (PTC) 1 and the transistor 2 connected in series between the input terminal P1 and the output terminal P2, and the transistor 2 Circuit 3.
  • PTC positive temperature coefficient thermistor
  • a power output terminal of an in-vehicle battery provided in a vehicle such as an automobile is connected between the input terminals PI and G1, and an electronic device such as a vehicle audio device is connected between the output terminals P2 and G2. I'm like it.
  • the current interrupting device shown in FIG. 1 (b) includes a transistor 4 and a resistor R connected in series between an input terminal P1 and an output terminal P2, a zener diode 5 for setting a base potential of the transistor 4, and a transistor. 6 and resistors rl and r2 for setting the base potential of the transistor 6.
  • the collector of the transistor 6 is connected to the base of the transistor 4.
  • the emitter and the base of the transistor 6 are connected to both ends of the resistors R and rl. It is connected.
  • a power output terminal of a vehicle-mounted battery provided in a vehicle such as an automobile is connected between the input terminals PI and G1, and a vehicle-mounted audio device or the like is connected between the output terminals P2 and G2. Electronic devices come to be connected.
  • the positive temperature coefficient thermistor 1 has a large temperature coefficient and the current vs. resistance characteristic changes significantly depending on the ambient temperature. There is a problem that the cutoff characteristics with respect to an excessive current vary, and it is difficult to design and maintain a thermal countermeasure so as to obtain a desired cutoff characteristic.
  • the positive temperature coefficient thermistor 1 is basically a resistance element, there is a problem when a current flows to the electronic device side even after the current is interrupted.
  • the transistor 6 determines that an excessive current exceeding the specified current value has flowed through the resistor R. Since the transistor 4 is turned off, the specified current value is set by adjusting the resistance values of the resistor R and the resistors rl and r2 with high accuracy in order to obtain the desired cutoff characteristics. It needs to be done.
  • the present invention has been made in view of such a conventional problem, and provides excellent cut-off characteristics with respect to an excessive current, and is easy to adjust, for example, to reduce the collector loss of a transistor. It is an object of the present invention to provide a current interrupting device exhibiting effects such as reduction.
  • the invention according to claim 1 is a current interrupting device that interrupts an excessive current flowing into a load through a current path, wherein the resistance is connected between the current path and the load; Current interrupting means for interrupting the flow of current into the load, and a first state which is turned on when a voltage generated across the resistor reaches a predetermined value or more in response to the flow of the excessive current. And a second transistor that turns on as the first transistor turns on and controls the current cutoff means, wherein the first transistor and the second transistor are connected to each other. It is characterized by forming a positive feedback circuit.
  • FIG. 1 is a diagram for explaining a configuration of a conventional current interrupt device.
  • FIG. 2 is a block diagram illustrating a configuration of a current interrupting device according to an embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating a configuration of a current interrupting device according to an embodiment.
  • FIG. 2 is a block diagram illustrating a configuration of the current interrupting device according to the present embodiment.
  • the current interrupting device is configured to include a current detecting unit including a resistor R, an interrupting unit 7, and a control unit including a PNP transistor 8 and an NPN transistor 9, and an input terminal P1 A resistor R and a cutoff unit 7 are connected in series in a current path between the output terminal P2 and the output terminal P2.
  • An emitter and a base of the PNP transistor 8 are connected to both ends Nl and N2 of the resistor R, and the cutoff unit 7 is controlled by a collector voltage generated at a collector of the NPN transistor 9.
  • the cutoff unit 7 is formed of a switching element or the like that switches between conduction and non-conduction between the resistor R and the output terminal P2 according to the collector voltage of the NPN transistor 9.
  • a power supply output terminal of a vehicle-mounted battery is connected between the input terminal P1 and a connection terminal G to which an emitter of the NPN transistor 9 is connected, and an electronic circuit or the like that operates by receiving power supply from the vehicle-mounted battery is provided.
  • a load such as an electronic device is connected between the output terminal P2 and the connection terminal G and the power is turned on for the above-described electronic circuit or electronic device, when the power supply voltage of the on-board battery fluctuates, or when the electronic circuit or electronic device
  • the following describes the case where an excessive current Io tries to flow from a vehicle-mounted battery to an electronic device or the like when some trouble occurs.
  • the PNP transistor 8 When the excessive current Io flows into the input terminal P1 side, and the excessive current Io generates a voltage higher than the forward voltage (base-emitter voltage) Vbe of the PNP transistor 8 at both ends Nl and N2 of the resistor R, The PNP transistor 8 is turned on, and a current flows from the emitter of the PNP transistor 8 to the base of the NPN transistor 9 via the collector. As a result, the NPN transistor 9 is quickly turned on, and the base potential of the PNP transistor 8 is lowered, so that the PNP transistor 8 is reliably set to the on state, and further, the PNP transistor 8 is reliably turned on. As a result, the NPN transistor 9 is also reliably turned on.
  • the PNP transistor 8 and the NPN transistor 9 when the excessive current Io flows through the resistor R, the PNP transistor 8 and the NPN transistor 9 also perform the same operation as the thyristor (Thyristor). As a result, it is possible to quickly prevent excessive current from flowing into a load of an electronic circuit or an electronic device connected to the output terminal P2. [0025] Further, since the collector voltage of NPN transistor 9 remains dropped to the potential of connection terminal G, cutoff unit 7 remains in a non-conducting state, thereby reliably preventing an excessive current from flowing into the load. be able to.
  • the cutoff portion 7 is maintained in a cutoff state. Therefore, even when the cutoff portion 7 is formed of a transistor, The collector loss of the transistor can be reduced, and the transistor need not be formed of a so-called large power transistor.
  • the resistor R and the output terminal P2 are not directly connected, and the resistor R and the output terminal P2 are connected via the cutoff unit 7. For this reason, the load of the electronic circuit or the electronic device connected to the output terminal P2 has a pure resistance characteristic, and in any case, the specified current value is set in advance so as to obtain a desired cutoff characteristic. Begging resistance R can be easily adjusted
  • the current interrupting device for interrupting an excessive current generated when power is supplied from a vehicle-mounted battery to an electronic device or the like. It is generally available as a device for shutting off air. For example, it can be used to connect a DC-DC converter, various power supply circuits, or an input stage of an electronic circuit to protect the electronic circuit.
  • FIG. 3 is a block diagram showing the configuration of the current interrupting device of the present embodiment, and the same or corresponding parts as those in FIG. 2 are denoted by the same reference numerals.
  • the current interrupting device corresponds to a current detecting unit including a resistor R, PNP transistors 7a and 7b corresponding to the interrupting unit illustrated in FIG. 2, and a control unit illustrated in FIG.
  • As voltage generating means, and a resistor R and a PNP transistor between the input terminal P1 and the output terminal P2. 7a is connected in series!
  • a capacitor C and a resistor r are connected in series between both ends Nl and N2 of the resistor R, and a PNP
  • the emitters of the transistors 7a and 7b are connected to one end N2 of the resistor R, and the base of the PNP transistor 7a and the collector of the PNP transistor 7b are connected to the emitter of the NPN transistor 9 via a resistor (omitted), and the base of the PNP transistor 7b Is connected to the collector N3 of the NPN transistor 9 via a resistor (symbol is omitted).
  • the collector of PNP transistor 8 and the base of NPN transistor 9 are connected via a resistor (symbol omitted), and the base of PNP transistor 8 and the collector of NPN transistor 9 have a resistor (symbol omitted).
  • the PNP transistor 8 and the NPN transistor 9 constitute a positive feedback circuit by being connected to each other! /
  • An emitter and a base of the PNP transistor 8 are connected to both ends of the capacitor C, and the PNP transistor 7b is controlled by a collector voltage generated at a collector N3 of the NPN transistor 9.
  • the NPN transistor 10 has its collector and emitter connected to the emitter and connection terminals Gl and G2 of the NPN transistor 9, respectively, and receives the control signal Sc via a resistor (not shown) connected to the base. Is applied.
  • the power output terminal of the vehicle-mounted battery is connected between the input terminals PI and G1
  • the load of an electronic circuit or electronic device that operates by receiving power supply from the vehicle-mounted battery is connected between the output terminals P2 and G2.
  • the NPN transistor 10 is switched to the off state and the on state by setting a predetermined plus voltage. Then, the current interrupting device becomes operable.
  • control signal Sc when the control signal Sc is set to the same ground potential as the input terminal G1 or the output terminal G2, for example, and the NPN transistor 10 is turned off, both the PNP transistor 8 and the NPN transistor 9 are turned off, and
  • the control signal Sc is set to a predetermined positive voltage and the NPN transistor 10 is turned on, a predetermined voltage is applied to the base of the PNP transistor 7a.
  • the bias voltage is applied, the PNP transistor 7a is turned on, the PNP transistor 8 and the NPN transistor 9 are both turned off, and the PNP transistor 7b is turned off.
  • the PNP transistor 8 When the voltage across the capacitor C becomes equal to or higher than the forward voltage Vbe of the PNP transistor 8, the PNP transistor 8 is turned on, and the emitter of the PNP transistor 8 is connected to the base of the NPN transistor 9 via the collector. Current flows into the As a result, the NPN transistor 9 is also quickly turned on, and the base potential of the PNP transistor 8 is lowered, so that the PNP transistor 8 is reliably set to the active state, and further, the PNP transistor 8 is reliably turned on. The state ensures that the NPN transistor 9 is also turned on.
  • the PNP transistor 8 and the NPN transistor 9 operate as positive feedback circuits with each other, so that they maintain the ON state.
  • the PNP transistor 7b is turned on, and further, when the PNP transistor 7b is turned on, the PNP transistor 7a is turned on. Non-conducting state is established, and the connection between the resistor R and the output terminal P2 is securely shut off.
  • the PNP transistor 8 and the NPN transistor 9 are both turned on due to the excessive current Io, the PNP transistor 7a continues to cut off, and the collector loss of the PNP transistor 7a can be reduced. For this reason, it is not necessary to form the PNP transistor 7a with a so-called large power transistor.
  • the resistor R and the output terminal P2 are not directly connected, and the resistor R and the output terminal P2 are connected via the PNP transistor 7a. Therefore, the electronic circuit connected to output terminal P2 Roads Loads such as electronic devices have a pure resistance characteristic! It is possible to do so.
  • the current interrupting device of the present embodiment is It is generally available as a device for interrupting current.
  • it can be used to protect a power supply device or the electronic circuit by connecting to a DC-DC converter, various power supply circuits, or an input stage of an electronic circuit.

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

Est fourni un rupteur pour inhiber l’arrivée d’un courant excessif dans une charge. Une résistance R et une section d’interruption (7) sont connectées à un chemin de courant entre une borne d’entrée P1 et une borne de sortie P2 connectées à une charge. Un transistor PNP (8) et un transistor NPN (9) constituant chacun un circuit de réaction positive sont connectés aux deux extrémités N1 et N2 de la résistance R. La section d’interruption (7) est contrôlée en passant/bloqué par la tension de collecteur du transistor NPN (9). Lorsqu’un courant excessif Io circule dans le chemin de courant, le transistor PNP (8) est mis en l’état passant en fonction d’une tension apparaissant à la résistance R. En outre, le transistor NPN (9) est mis en l’état passant et la section d’interruption (7) est mise en l’état bloqué, interrompant ainsi l’afflux de courant vers la charge.
PCT/JP2005/009096 2004-05-28 2005-05-18 Rupteur de courant Ceased WO2005117050A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-159244 2004-05-28
JP2004159244 2004-05-28

Publications (1)

Publication Number Publication Date
WO2005117050A1 true WO2005117050A1 (fr) 2005-12-08

Family

ID=35451123

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2005/009096 Ceased WO2005117050A1 (fr) 2004-05-28 2005-05-18 Rupteur de courant

Country Status (1)

Country Link
WO (1) WO2005117050A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5151733A (ja) * 1974-10-31 1976-05-07 Sharp Kk Kadenryuhogokairo
JPS5151734A (ja) * 1974-10-31 1976-05-07 Sharp Kk Kadenryuhogokairo
JPS54174834U (fr) * 1978-05-30 1979-12-10
JPS57206220A (en) * 1981-06-10 1982-12-17 Nippon Electric Co Overcurrent limiting circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5151733A (ja) * 1974-10-31 1976-05-07 Sharp Kk Kadenryuhogokairo
JPS5151734A (ja) * 1974-10-31 1976-05-07 Sharp Kk Kadenryuhogokairo
JPS54174834U (fr) * 1978-05-30 1979-12-10
JPS57206220A (en) * 1981-06-10 1982-12-17 Nippon Electric Co Overcurrent limiting circuit

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