JP2013135507A - Battery power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery power supply device capable of facilitating detection of failure in opening/closing means without both the necessity of a current detection circuit for only failure detection and use of a voltage detection circuit for high voltage.SOLUTION: The battery power supply device 1 includes: a battery 3; connection terminals T1 and T2; a main wiring L1 for connecting one electrode of the battery 3 with the connection terminal T1; a main wiring L2 for connecting the other electrode of the battery 3 with the connection terminal T2; a coil SW1b; a contact SW1 which turns on and off according to currents running through the coil SW1b; a control wiring LA which is connected with the coil SW1b and through which electric currents supplied to the coil SW1b run; an annular loop section for inserting either one of the main wirings L1 and L2 and the control wiring LA; and a current detection element 4 for detecting currents which pass through the loop section.

Description

  The present invention relates to a battery power supply apparatus that supplies power using a battery.

  In recent years, batteries such as nickel metal hydride secondary batteries and lithium ion secondary batteries have been widely used as power sources for supplying electric power for driving EVs (Electric Vehicles) and HEVs (Hybrid Electric Vehicles). In such a power supply system, in order to calculate the remaining battery level (SOC), a current detection circuit that detects a current flowing through the battery is provided. Conventionally, a technique using another current detection circuit to detect such a failure of the current detection circuit is known (see, for example, Patent Document 1).

  Further, such a battery outputs a voltage to an inverter circuit that generates a motor driving voltage. Here, since the output voltage output from the battery to the inverter circuit is a high voltage of about 300 V to 500 V, a contactor is provided as an opening / closing means capable of opening and closing the high voltage between the inverter circuit and the battery.

  Conventionally, in order to detect such a contactor failure, the contactor terminal voltage, that is, the output voltage of the high voltage is measured, and whether or not the contactor terminal voltage changes when the contactor is turned on or off. A contactor failure was detected.

JP 2009-229404 A

  However, the provision of a current detection circuit for failure detection has the disadvantage of increasing costs. In addition, since a voltage detection circuit for detecting a high voltage such as 300 V to 500 V needs to be configured using high-voltage components, the method for detecting a contactor failure based on the contactor terminal voltage increases the cost. There was an inconvenience of doing.

  An object of the present invention is to provide a battery power supply device that does not require a current detection circuit only for failure detection and that can easily detect a failure related to an opening / closing means without using a high voltage detection circuit. It is.

  The battery power supply device according to the present invention includes a battery, a first terminal and a second terminal for supplying a voltage of the battery to an external circuit, and a first terminal that connects one electrode of the battery and the first terminal. A first main coil; a second main wiring connecting the other electrode of the battery and the second terminal; and a first coil, wherein the first coil is turned on and off according to a current flowing through the first coil. A first opening / closing part that switches between one main wiring between a conduction state and a blocking state; a first control wiring that is connected to the first coil and through which a current supplied to the first coil flows; and the first main wiring And a second main wiring and an annular loop portion through which the first control wiring is inserted, and a current detection element for detecting a current passing through the loop portion.

  According to this configuration, since one of the first main wiring and the second main wiring and the first control wiring are inserted into the loop portion of the current detection element, the current detection element is connected to the battery and the external A total current of the current flowing between the circuit and the current flowing through the first coil of the first opening / closing part is detected. Therefore, the current flowing through the first coil of the first opening / closing part can be detected using the current detection element used to detect the current flowing between the battery and the external circuit. If a failure occurs in the first opening / closing section, for example, the first coil is disconnected, the current flowing through the first coil changes, and the current detected by the current detection element also changes. Therefore, the current detected by the current detection element Therefore, it is easy to detect a failure related to the first opening / closing part which is the opening / closing means. Further, it is not necessary to provide a current detection circuit only for failure detection, and it is not necessary to use a high voltage detection circuit.

  A second opening / closing unit that includes a second coil and switches the second main wiring between a conductive state and a cut-off state by turning on and off according to a current flowing through the second coil; It is preferable that a second control wiring connected to the coil and through which a current supplied to the second coil flows is further provided, and the second control wiring is further inserted into the loop portion.

  According to this configuration, since the second main wiring can be cut off by the second opening / closing section, the first and second opening / closing sections constitute a so-called double-cut opening / closing circuit that blocks both electrodes of the battery from the external circuit. Can improve safety. In addition, since the second control wiring is further inserted in the loop portion, the current detection element includes a current flowing between the battery and the external circuit, a current flowing in the first coil of the first opening / closing portion, The sum total current with the current which flows into the 2nd coil of 2 opening-and-closing parts is detected. Therefore, it is easy to detect a failure related to the first and second opening / closing parts as the opening / closing means based on the current detected by the current detection element.

  In addition, a third main wiring that connects the one electrode of the battery and the first terminal via a resistor, and a third coil, which are turned on and off according to the current flowing through the third coil. A third opening / closing portion that switches the third main wiring between a conducting state and a blocking state; a third control wiring that is connected to the third coil and through which a current supplied to the third coil flows; A failure detection unit that detects a failure related to the first, second, and third opening / closing units based on a current detected by a current detection element is further provided, and the third control wiring is further inserted into the loop unit. The external circuit has a stop period in which a DC current does not flow before starting, a standby period in which a DC current does not flow after being started, and a load current after the standby period has passed. Having a flowing operating period It is preferred.

  According to this configuration, the external circuit has a stop period in which the DC current does not flow before being started, a standby period in which the DC current does not flow after being started, and a load current after the standby period has elapsed. And a flowing operation period. When the third opening / closing part is turned on, a current is supplied to the external circuit via the resistor, so that the current flowing to the external circuit is limited by the resistor. Therefore, by turning on the third opening / closing unit during the standby period of the external circuit, it is easy to execute so-called precharge that charges the capacitance of the external circuit while reducing the rush current. In the operation period after the capacitance of the external circuit is charged, the rush current is reduced even if the first opening / closing section is turned on and current is supplied to the external circuit without passing through the resistor.

  Further, the failure detection unit, based on the current detected by the current detection element during the process of stopping the current supply to the first, second, and third coils during the stop period, It is preferable to detect a failure relating to the first, second, and third opening / closing sections.

  According to this configuration, when one of the first, second, and third opening / closing parts has a short circuit failure, the process of stopping the current supply to the first, second, and third coils during the stop period As a result of the current being detected by the current detection element during the execution, the failure detection unit may detect a failure related to the first, second, and third opening / closing units based on the current detected by the current detection element. It becomes possible.

  In addition, the failure detection unit is detected by the current detection element during the process of stopping the current supply to the first coil and supplying the current to the second and third coils during the standby period. It is preferable to detect a failure related to the second and third opening / closing sections based on the current.

  According to this configuration, when a failure relating to the second and third opening / closing parts such as the second and third coils and their drive circuits has occurred, the current detection element causes the current to be supplied to the second and third coils. The detected current changes. Accordingly, the failure detection unit performs the second and second currents based on the current detected by the current detection element during the process of supplying current to the second and third coils in the standby period, that is, during the precharge. It is possible to detect a failure relating to the three opening / closing parts. In this case, during the standby period for reducing the rush current flowing in the external circuit (during precharge execution), it is possible to detect a failure relating to the second and third switching units, so that only time is required for failure diagnosis. Never spend.

  In addition, the second control wiring and the third control wiring are different from each other in the number of windings around the loop portion, and the failure detection unit stops supplying current to the first coil in the standby period, Based on the current detected by the current detection element during the process of supplying current to the second and third coils, a detection process for detecting a failure related to the second and third opening / closing parts is performed, and When a failure is detected, it is preferable to determine which of the second and third opening / closing parts the detected failure is related to.

  According to this configuration, since the second control wiring and the third control wiring have different numbers of windings around the loop portion, the current detection value of the current detection element with respect to the current flowing through the second control wiring, and the third control wiring The current value is different from the current detection value of the current detection element for the current flowing in the wiring. Therefore, the failure detection unit performs the second and third based on the current detected by the current detection element during the process of supplying the current to the second and third coils in the standby period, that is, during the precharge. A failure relating to the opening / closing part can be detected, and if a failure is further detected, a determination is made as to which of the second and third opening / closing parts the detected failure is based on the detected current value. can do.

  In addition, when the failure detection unit performs the detection process, the failure detection unit starts supplying current to the second and third coils, and then the current detected by the current detection element is in a steady state. It is preferable to detect a failure relating to the second and third opening / closing sections based on the current detected by the current detection element.

  When the external circuit is a capacitive load, when current supply to the second and third coils is started and the second and third open / close sections are turned on, a rush current flows through the resistor to the external circuit. When the rush current gradually decreases to zero, the current detected by the current detection element becomes a steady state and indicates the current flowing through the second and third control wirings. Therefore, the failure detection unit starts the current supply to the second and third coils, and then, based on the current detected by the current detection element after the current detected by the current detection element is in a steady state, By detecting a failure relating to the second and third opening / closing sections, the accuracy of failure detection is improved.

  In addition, the failure detection unit is detected by the current detection element during the process of stopping the current supply to the third coil during the operation period and supplying the current to the first and second coils. It is preferable to detect a failure relating to the first opening / closing part based on the current.

  According to this configuration, when the current supply to the first and second coils is started and the first and second opening / closing sections are turned on, a current flows through at least the first and second control wirings, and the current is It is detected by the detection element. And if the failure regarding the 1st opening-and-closing part, such as failure of the 1st coil, has occurred, the current value detected by the current detection element changes from the normal time. Therefore, the failure detection unit can detect a failure related to the first opening / closing unit based on the current detected by the current detection element during the process of supplying current to the first and second coils during the operation period. it can. In this case, a failure relating to the first opening / closing unit can be detected during the operation period of the external circuit, so that no time is spent only for failure diagnosis.

  In addition, a third main wiring that connects the one electrode of the battery and the first terminal via a resistor, and a third coil, which are turned on and off according to the current flowing through the third coil. A third opening / closing portion that switches the third main wiring between a conducting state and a blocking state; a third control wiring that is connected to the third coil and through which a current supplied to the third coil flows; Further comprising a failure detection unit for detecting a failure related to the first and third switching units based on the current detected by the current detection element, wherein the loop control unit is further inserted with the third control wiring; The external circuit includes a stop period in which a direct current does not flow before being started, a standby period in which a direct current does not flow after being started, and an operation period in which a load current flows after the standby period has elapsed. To have Good.

  According to this configuration, the battery power supply device does not include the second opening / closing part. The external circuit includes a stop period in which no DC current flows before being started, a standby period in which a DC current does not flow after being started, and an operation period in which a load current flows after the standby period has elapsed. have. When the third opening / closing part is turned on, a current is supplied to the external circuit via the resistor, so that the current flowing to the external circuit is limited by the resistor. Therefore, by turning on the third opening / closing unit during the standby period of the external circuit, it is easy to execute so-called precharge that charges the capacitance of the external circuit while reducing the rush current. In the operation period after the capacitance of the external circuit is charged, the rush current is reduced even if the first opening / closing section is turned on and current is supplied to the external circuit without passing through the resistor.

  In addition, a failure detection unit that detects a failure related to the first opening / closing unit based on a current detected by the current detection element during a process of supplying a current to the first coil via the first control wiring. May be further provided.

  According to this configuration, when a failure occurs in the first opening / closing part, for example, the first coil is disconnected, the current detected by the current detection element also changes. Accordingly, the failure detection unit can detect a failure related to the first opening / closing unit based on the current detected by the current detection element during the process of supplying current to the first coil via the first control wiring. it can.

  Further, the failure detection unit further includes the second opening / closing unit based on a current detected by the current detection element during a process of supplying a current to the second coil via the second control wiring. It is preferable to detect a fault regarding.

  According to this configuration, when a failure such as the disconnection of the second coil occurs in the second opening / closing unit, the current detected by the current detection element also changes. Therefore, the failure detection unit can detect a failure related to the second opening / closing unit based on the current detected by the current detection element during the process of supplying current to the second coil via the second control wiring. it can.

  In addition, a third main wiring that connects the one electrode of the battery and the first terminal via a resistor, and a third coil, which are turned on and off according to the current flowing through the third coil. A third opening / closing part that switches the third main wiring between a conductive state and a cut-off state; and a third control wiring that is connected to the third coil and through which a current supplied to the third coil flows. It is preferable that the third control wiring is further inserted in the loop portion.

  According to this configuration, when the third opening / closing part is turned on, a current is supplied to the external circuit via the resistor, so that the current flowing to the external circuit is limited by the resistor. Therefore, by turning on the third opening / closing unit, it is easy to perform so-called precharge that charges the capacitance of the external circuit while reducing the rush current. Even if the first opening / closing part is turned on after the capacity of the external circuit is charged and current is supplied to the external circuit without passing through the resistor, the rush current is reduced. Further, since the third control wiring is further inserted in the loop portion, the current detection element detects a current including a current flowing through the third coil of the third opening / closing portion. Therefore, it is easy to detect a failure related to the third opening / closing part as the opening / closing means based on the current detected by the current detection element.

  Further, the failure detection unit further includes the third opening / closing unit based on a current detected by the current detection element during a process of supplying a current to the third coil via the third control wiring. It is preferable to detect a fault regarding.

  According to this configuration, when a failure occurs in the third opening / closing part, for example, the third coil is disconnected, the current detected by the current detection element also changes. Therefore, the failure detection unit can detect a failure related to the third opening / closing unit based on the current detected by the current detection element during the process of supplying the current to the third coil via the third control wiring. it can.

  The battery power supply device having such a configuration does not need to include a current detection circuit only for failure detection, and can easily detect a failure related to the switching means without using a high voltage detection circuit.

It is a conceptual diagram which shows notionally HEV provided with the battery power supply device which concerns on one Embodiment of this invention. It is a circuit diagram which shows a detailed example of the battery power supply device and external circuit which are shown in FIG. It is a timing chart which shows an example of operation | movement of the battery power supply device which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows an example of the method of winding control wiring around the loop part of an electric current detection element. It is a timing chart which shows an example of operation of the battery power unit concerning a 2nd embodiment of the present invention.

  Embodiments according to the present invention will be described below with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted.

(First embodiment)
FIG. 1 is a conceptual diagram conceptually showing an HEV including a battery power supply device 1 according to an embodiment of the present invention. The HEV 100 shown in FIG. 1 includes a battery power supply device 1, an external circuit 2, a motor 101, a generator 102, and an engine 103.

  The external circuit 2 is configured by connecting an inverter 21 and a capacitor 22 as a load capacity in parallel. The battery power supply device 1 includes a battery 3, contactors SW1, SW2, SW3, and a resistor R. The negative electrode of the battery 3 is connected to the inverter 21 via the contactor SW2. The positive electrode of the battery 3 is connected to the inverter 21 via the contactor SW1. In addition, a series circuit of a contactor SW3 and a resistor R is connected in parallel with the contactor SW1.

  A motor 101 and a generator 102 are connected to the inverter 21. The inverter 21 drives the motor 101 based on the power supplied from the battery 3. The generator 102 receives the driving force of the engine 103 as necessary to generate power. The inverter 21 charges the battery 3 with the power generated by the generator 102.

  FIG. 2 is a circuit diagram showing a detailed example of the battery power supply device 1 and the external circuit 2 shown in FIG. 2 includes a connection terminal T1 (an example of a first terminal), a connection terminal T2 (an example of a second terminal), a battery 3, a contactor SW1 (an example of a first opening / closing part), and a contactor SW2 (a first contact). 2 opening / closing part), contactor SW3 (an example of third opening / closing part), switches A, B, C, resistor R, current detection element 4, current measuring circuit 5, and control part 6. An external circuit 2 is connected to the connection terminals T1 and T2.

  Connected to the outside of the battery power supply 1 is a power supply circuit 8 that generates an operation power supply voltage for operating the contactors SW1, SW2, SW3, the current measuring circuit 5, the control unit 6 and the like from the output voltage of the lead battery 9. Has been.

  The battery 3 is an assembled battery configured by combining a plurality of secondary batteries such as a nickel hydrogen secondary battery and a lithium ion secondary battery. The output voltage of the battery 3 is set to a high voltage of about 300V to 500V, for example.

  The contactor SW1 includes a switching contact SW1a and a coil SW1b (an example of a first coil). The contactor SW2 includes a switching contact SW2a and a coil SW2b (an example of a second coil). The contactor SW3 includes a switching contact SW3a and a coil SW3b (an example of a third coil). The switching contacts SW1a, SW2a, SW3a are turned on when current flows through the coils SW1b, SW2b, SW3b, and are turned off when current does not flow.

  The current detection element 4 is a current sensor that has an annular loop portion and detects a current passing through the loop portion. The current detection element 4 includes, for example, an annular magnetic core as a loop portion, and a Hall current sensor (for example, KOHSHIN ELECTRIC CO., LTD) that converts magnetism generated by current passing through the through hole of the magnetic core into a voltage signal by the Hall element. HS series) can be used.

  The connection terminal T1 is connected to the positive electrode of the battery 3 via the switching contact SW1a. The connection terminal T1, the switching contact SW1a, and the battery 3 are connected to each other by a main wiring L1 (an example of a first main wiring).

  The connection terminal T1 is connected to the positive electrode of the battery 3 via the resistor R and the switching contact SW3a. The connection terminal T1, the resistor R, and the switching contact SW3a are connected to each other by a main wiring L3 (an example of a third main wiring). The main line L3 connected to one end of the switching contact SW3a is connected to the main line L1 connected to the positive electrode of the battery 3.

  The connection terminal T2 is connected to the negative electrode of the battery 3 via the switching contact SW2a. The connection terminal T2, the switching contact SW2a, and the battery 3 are connected to each other by a main wiring L2 (an example of a second main wiring). The main wiring L2 is wired so as to penetrate the loop portion of the current detection element 4.

  The switches A, B, and C are switching elements such as transistors. The switches A, B, and C are turned on and off according to a control signal from the control unit 6. The power supply circuit 8 is connected to the circuit ground via the switch A and the coil SW1b. The power supply circuit 8, the switch A, the coil SW1b, and the circuit ground are connected by a control wiring LA (an example of a first control wiring). The control wiring LA is wired so as to penetrate the loop portion of the current detection element 4. Thus, when the switch A is turned on, a current flows through the coil SW1b via the control wiring LA, and the switching contact SW1a is turned on (the contactor SW1 is turned on). At this time, the current flowing through the control line LA and the main line L2 is detected by the current detection element 4. Hereinafter, a circuit from the power supply circuit 8 to the circuit ground via the switch A and the coil SW1b is referred to as an A system.

  The power supply circuit 8 is connected to the circuit ground via the switch B and the coil SW3b. The power supply circuit 8, the switch B, the coil SW3b, and the circuit ground are connected by a control wiring LB (an example of a third control wiring). The control wiring LB is wired so as to penetrate the loop portion of the current detection element 4. Thus, when the switch B is turned on, a current flows through the coil SW3b via the control wiring LB, and the switching contact SW3a is turned on (the contactor SW3 is turned on). At this time, the current flowing through the control wiring LB and the main wiring L2 is detected by the current detection element 4. Hereinafter, a circuit from the power supply circuit 8 to the circuit ground via the switch B and the coil SW3b is referred to as a B system.

  Note that the contactor SW3, the resistor R, the main wiring L3, the switch B, and the control wiring LB are not necessarily provided.

  The power supply circuit 8 is connected to the circuit ground via the switch C and the coil SW2b. The power supply circuit 8, the switch C, the coil SW2b, and the circuit ground are connected by a control wiring LC (an example of a second control wiring). The control wiring LC is wired so as to penetrate the loop portion of the current detection element 4. Thus, when the switch C is turned on, a current flows through the coil SW2b via the control wiring LC, and the switching contact SW2a is turned on (the contactor SW2 is turned on). At this time, the current flowing through the control wiring LC and the main wiring L2 is detected by the current detection element 4. Hereinafter, a circuit from the power supply circuit 8 to the circuit ground via the switch C and the coil SW2b is referred to as a C system.

  The control lines LA, LB, and LC are wired so that currents flowing through the control lines LA, LB, and LC pass through the loop portion of the current detection element 4 in the same direction. The main wiring L2 is wired so that the current flowing through the main wiring L2 when the battery 3 is discharged passes through the loop portion of the current detection element 4 in the same direction as the current flowing through the control wirings LA, LB, LC. . The main wiring L2 may be wired so that the current flowing through the main wiring L2 during charging of the battery 3 passes through the loop portion of the current detection element 4 in the same direction as the current flowing through the control wirings LA, LB, LC. Good. Further, instead of the main wiring L2, the main wiring L1 may be wired so as to pass through the loop portion of the current detection element 4.

  Thereby, the current detection element 4 detects the sum of the currents flowing through the control lines LA, LB, LC and the main line L2, and outputs a voltage signal indicating the current value to the current measurement circuit 5. The current measurement circuit 5 is configured using, for example, an analog-digital converter. The current measurement circuit 5 converts the voltage signal output from the current detection element 4 into a digital value, and outputs it to the control unit 6 as a current measurement value I indicating the current value of the current detected by the current detection element 4.

  When the switches A, B, and C are turned on, the current values flowing through the coils SW1b, SW2b, and SW3b, that is, the current values flowing through the control wirings LA, LB, and LC are equal to each other and are set to the current value Is.

  The control unit 6 includes, for example, a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a ROM (Read Only Memory) that stores a predetermined control program, and a RAM (Random Access Memory) that temporarily stores data. And a timer circuit and these peripheral circuits. And the control part 6 functions as the failure detection part 61 by running the program memorize | stored in ROM.

  The failure detection unit 61 turns off the switches B and C, turns on the switch A, and supplies a current to the coil SW1b. Based on the current value detected by the current detection element 4, the failure detection unit 61 That is, a failure relating to the first opening / closing part is detected. Further, the failure detection unit 61 turns off the switches A and C, turns on the switch B, and supplies current to the coil SW3b based on the current value detected by the current detection element 4 during the period of supplying current to the coil SW3b. A failure, that is, a failure related to the third opening / closing part is detected. Further, the failure detection unit 61 turns off the switches A and B, turns on the switch C, and supplies current to the coil SW2b, based on the current value detected by the current detection element 4, based on the current value of the system C. A failure, that is, a failure related to the second opening / closing part is detected.

  Next, the operation of the battery power supply device 1 shown in FIG. 2 will be described. FIG. 3 is a timing chart showing an example of the operation of the battery power supply device 1. First, in a stop period in which the inverter 21 is not activated, the failure detection unit 61 determines a preset current measurement value I detected by the current detection element 4 with the switches A, B, and C turned off. Compare with the value Ith1 (timing T0). The determination value Ith1 is larger than zero and smaller than the current value Is.

  Then, the failure detection unit 61 determines that one of the switches A, B, and C has a short-circuit failure if the current measurement value I exceeds the determination value Ith1 at timing T0, that is, if it is not zero. . And the signal which shows generation | occurrence | production of a failure is output to vehicle ECU (Electronic Control Unit) not shown, for example.

  On the other hand, if current measurement value I does not satisfy determination value Ith1 at timing T0, that is, if it is considered to be zero, failure detection unit 61 turns off switches B and C and turns on switch A (timing T1). Then, as shown in FIG. 3A, if the A system is normal, the current of the current value Is flows through the coil SW1b and the control wiring LA, and the current measurement value I exceeds the determination value Ith1.

  Therefore, the failure detection unit 61 compares the current measurement value I with the determination value Ith1 (timing T2). Then, failure detection unit 61 determines that system A is normal if current measurement value I exceeds determination value Ith1. On the other hand, failure detection unit 61 determines that system A has failed if current measurement value I does not satisfy determination value Ith1, and outputs a signal indicating the failure of system A to, for example, a vehicle ECU (not shown). .

  Next, the failure detection unit 61 turns off the switches A and C and turns on the switch B (timing T3). Then, as shown in FIG. 3A, if the B system is normal, the current of the current value Is flows through the coil SW3b and the control wiring LB, and the measured current value I exceeds the determination value Ith1.

  Therefore, the failure detection unit 61 compares the current measurement value I with the determination value Ith1 (timing T4). Then, the failure detection unit 61 determines that the B system is normal if the current measurement value I exceeds the determination value Ith1. On the other hand, for example, as shown in FIG. 3B, the failure detection unit 61 determines that the B system has failed if the current measurement value I does not satisfy the determination value Ith1, and indicates a failure occurrence of the B system. Is output to a vehicle ECU (not shown), for example.

  Next, the failure detection unit 61 turns off the switches A and B and turns on the switch C (timing T5). Then, as shown in FIG. 3A, if the C system is normal, the current of the current value Is flows through the coil SW2b and the control wiring LC, and the current measurement value I exceeds the determination value Ith1.

  Therefore, the failure detection unit 61 compares the current measurement value I with the determination value Ith1 (timing T6). Then, the failure detection unit 61 determines that the C system is normal if the current measurement value I exceeds the determination value Ith1. On the other hand, if the current measurement value I does not satisfy the determination value Ith1, the failure detection unit 61 determines that the C system has failed, and outputs a signal indicating the occurrence of the failure of the C system to, for example, a vehicle ECU (not shown). .

  As described above, the failure of the A, B, and C systems can be diagnosed by the processing at the timings T0 to T6. In this case, it is not necessary to provide a current detection circuit only for fault detection of the A, B, and C systems, and it is not necessary to use a high voltage detection circuit.

  For example, when an activation signal indicating activation of the inverter 21 is output from a vehicle ECU (not shown), the control unit 6 turns off the switch A and turns on the switches B and C (timing T7). The inverter 21 does not start operation during a standby period set in advance after the start signal is output, and therefore no current flows through the inverter 21. The standby period is provided as a period for performing precharging to reduce the inrush current to the capacitor 22 by charging the capacitor 22 with a low current before the operation of the inverter 21 is started.

  When the switches B and C are turned on, the contactors SW2 and SW3 are turned on, the current output from the battery 3 is supplied to the capacitor 22 via the resistor R, and the capacitor 22 is charged. When the switches B and C are turned on (timing T7), a rush current (inrush current) flows to the capacitor 22. However, the rush current flows through the resistor R, so that the rush current is reduced.

  When the standby period elapses, the control unit 6 turns off the switch B and turns on the switches A and C (timing T8). Thereby, the current output from the battery 3 is supplied to the inverter 21 without passing through the resistor R, and the inverter 21 can start operation.

(Second Embodiment)
Next, a battery power supply device 1a according to a second embodiment of the present invention will be described. The configuration of the battery power supply device 1a is shown in FIG. The battery power supply device 1 a is different from the battery power supply device 1 in that the control unit 6 a includes a failure detection unit 61 a instead of the failure detection unit 61, and the control wirings LA and LC are wound around the loop portion of the current detection element 4. Is different.

  Since other configurations are the same as those of the battery power supply device 1, description thereof will be omitted, and characteristic points of the present embodiment will be described below.

  FIG. 4 is an explanatory diagram showing an example of how the control wirings LA and LC are wound around the loop portion of the current detection element 4. In the example shown in FIG. 4, the main wiring L <b> 2 and the control wiring LB just pass through the loop portion of the current detection element 4 and are not wound. That is, the number of windings of the main wiring L2 and the control wiring LB is zero. The control lines LA and LC are wound around the loop portion of the current detection element 4 once. That is, the number of windings of the control wiring LB and the control wiring LC is set to be different from each other. Although the example in which the number of windings of the control wiring LA and the control wiring LC is equal is shown, the number of windings of the control wiring LA and the control wiring LC may be different from each other. Further, the number of windings is not limited to 0 times and 1 time.

  Since the control wiring LB only passes through the loop portion of the current detection element 4 and is not wound, when the current of the current value Is flows through the control wiring LB, the current measurement value I of the current detection element 4 changes the current value Is. Show. On the other hand, since the control lines LA and LC are wound around the loop portion of the current detection element 4 once, the current flowing through the control lines LA and LC passes through the loop portion of the current detection element 4 twice. As a result, when the current of the current value Is flows through the control wiring LA, the current measurement value I of the current detection element 4 shows the current value Is × 2. Similarly, when a current having a current value Is flows through the control wiring LC, the current measurement value I of the current detection element 4 indicates a current value Is × 2.

  Next, the operation of the battery power supply device 1a shown in FIG. 2 will be described. FIG. 5 is a timing chart showing an example of the operation of the battery power supply device 1a. First, in the stop period in which the inverter 21 is not activated, the failure detection unit 61a compares the current measurement value I detected by the current detection element 4 with the determination value Ith1 with the switches A, B, and C turned off. (Timing T11).

  Then, the failure detection unit 61a determines that any one of the switches A, B, and C has a short-circuit failure if the current measurement value I exceeds the determination value Ith1 at timing T11, that is, if it is not zero. . And the signal which shows generation | occurrence | production of a failure is output, for example to unillustrated vehicle ECU.

  On the other hand, if current measurement value I does not satisfy determination value Ith1 at timing T11, that is, if it is considered to be zero, failure detection unit 61a waits until an activation signal is received from, for example, a vehicle ECU (not shown). When a start signal is output from the vehicle ECU, the failure detection unit 61a turns off the switch A and turns on the switches B and C (timing T12).

  When the switches B and C are turned on, the contactors SW2 and SW3 are turned on, the current output from the battery 3 is supplied to the capacitor 22 via the resistor R, and the capacitor 22 is charged. When the switches B and C are turned on (timing T12), a rush current (inrush current) flows through the capacitor 22, but the rush current flows through the resistor R, so that the rush current is reduced.

  At this time, if the B system and the C system are normal, the current measurement value I is a current value Is flowing through the control wiring LB and a current value Is × 2 corresponding to the current of the current value Is flowing through the control wiring LC. This is an added value with the rush current flowing through the main wiring L2.

  For this reason, as shown in FIG. 5A, immediately after the switches B and C are turned on (timing T12), the current measurement value I suddenly becomes large due to the rush current flowing through the main wiring L2, but thereafter The measured current value I gradually decreases as the capacitor 22 is charged. At a timing T13 when a predetermined time has elapsed from the timing T12, the rush current becomes almost zero, and the current measurement value I is based on the current flowing through the control wirings LB and LC between the current value Is and the current value Is × 2. The current value Is × 3, which is the added value, becomes almost a steady state.

  The failure detection unit 61a compares the current measurement value I with a predetermined determination value Ith3 at timing T13 when the current measurement value I is in a steady state (timing T13). The failure detection unit 61a monitors the current measurement value I, for example, and when the amount of change in the current measurement value I in a predetermined time, for example, unit time, falls below a preset reference value, the current measurement value I is in a steady state. For example, the failure detection unit 61a determines that the current measurement value I is in a steady state when the elapsed time from the timing T12 reaches a determination time that is experimentally obtained in advance and set. May be.

  The determination value Ith3 is smaller than the current value Is × 3 and larger than the current value Is × 2. Then, the failure detection unit 61a determines that the B system and the C system are normal if the current measurement value I exceeds the determination value Ith3 at timing T13. On the other hand, as shown in FIG. 5C, for example, when the current measurement value I is less than the determination value Ith3 and exceeds the preset determination value Ith2, the failure detection unit 61a Determines that a failure has occurred, and outputs a signal indicating the occurrence of failure in the B system to, for example, a vehicle ECU (not shown). The determination value Ith2 is set to a value smaller than the current value Is × 2 and exceeding the current value Is.

  For example, when the system B fails because the coil SW3b is disconnected, for example, the current measurement value I at the timing T13 is only the current value Is × 2 corresponding to the current value Is flowing through the control wiring LC. Therefore, as shown in FIG. 5C, the failure detection unit 61a has a normal C system and a faulty B system when the current measurement value I is less than the determination value Ith3 and exceeds the determination value Ith2. Can be determined.

  Further, as shown in FIG. 5D, for example, when the current measurement value I is less than the determination value Ith2 and exceeds the determination value Ith1, the failure detection unit 61a For example, a signal indicating the occurrence of a failure in the C system is output to a vehicle ECU (not shown).

  For example, when the C system fails because the coil SW2b is disconnected, the current measurement value I at the timing T13 is only the current value Is corresponding to the current flowing through the control wiring LB. Therefore, as shown in FIG. 5 (d), the failure detection unit 61a has a normal B system and a defective C system when the current measurement value I is less than the determination value Ith2 and exceeds the determination value Ith1. Can be determined.

  Further, when the current measurement value I is less than the determination value Ith1 at the timing T13, the failure detection unit 61a indicates that both the B system and the C system have failed or the current detection element 4 or the current measurement circuit 5 has failed. For example, a signal indicating the occurrence of a failure is output to a vehicle ECU (not shown).

  If the failure detection unit 61a determines that some failure has occurred at timing T13, the failure detection unit 61a turns off the switches A, B, and C and does not operate the inverter 21 at timing T14 when the standby period after timing T12 has elapsed.

  If the failure detection unit 61a determines that the B system and the C system are normal at timing T13, the failure detection unit 61a turns off the switch B and turns on the switches A and C at timing T14 (timing T14).

  When the switches A and C are turned on, if the A system is normal, the contactors SW1 and SW2 are turned on, and the current output from the battery 3 is supplied to the inverter 21 without passing through the resistor R. At this time, since the capacitor 22 is already charged, no rush current flows. Therefore, if the system A is normal at timing T15 after the switches A and C are turned on at timing T14, the current measurement value I is the current value Is × corresponding to the current value Is flowing through the control wiring LA. 2, an addition value of the current value Is × 2 corresponding to the current value Is flowing through the control wiring LC and the operating current of the inverter 21 flowing through the main wiring L <b> 2.

  That is, at timing T15, if the system A is normal, at least the current value Is × 4 is detected as the current measurement value I by the current detection element 4 according to the current flowing through the control lines LA and LC. become.

  Therefore, the failure detection unit 61a compares the current measurement value I with a preset determination value Ith4 at timing T15 (timing T15). The determination value Ith4 is larger than the current value Is × 3 and smaller than the current value Is × 4. Then, for example, as illustrated in FIG. 5A, the failure detection unit 61a determines that the A system is normal if the current measurement value I exceeds the determination value Ith4 at timing T15. On the other hand, when the current measurement value I is less than the determination value Ith4 at the timing T15, the failure detection unit 61a determines that the A system is in failure, and a signal indicating the occurrence of the failure in the A system is, for example, not illustrated. Output to the vehicle ECU.

  As described above, according to the processing at the timings T11 to T15, the A, B, and C systems are not provided only for fault diagnosis of the A, B, and C systems, and the high voltage detection circuit is not used. Can be detected, and it is possible to specify which of the A, B, and C systems has failed. In addition, according to the processing at timings T11 to T15, the failure of the A, B, and C systems is performed using the standby period provided to reduce the rush current when starting the inverter 21 and the subsequent operation period. Diagnosis can be made. As a result, it is not necessary to turn on and off the contactors SW1, SW2, and SW3 only for the fault diagnosis of the A, B, and C systems, so that the time required for the fault diagnosis of the A, B, and C systems is substantially reduced. Can be zero.

  The number of windings of the control wirings LA, LB, LC around the current detection element 4 may be equal to each other. In this case, the failure detection unit 61a cannot identify whether the B or C system has failed at the timing T13, but if the current measurement value I is equal to or less than the determination value Ith3, It can be determined that at least one has failed.

  Further, the battery power supply device 1a does not necessarily include the contactor SW3, the resistor R, the main wiring L3, the switch B, and the control wiring LB, and may not include the contactor SW2, the switch C, and the control wiring LC. Good.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used as a battery power supply device that supplies electric power to vehicles such as electric cars and hybrid cars, and other various electric devices.

DESCRIPTION OF SYMBOLS 1,1a Battery power supply device 2 External circuit 3 Battery 4 Current detection element 5 Current measurement circuit 6, 6a Control part 8 Power supply circuit 9 Lead battery 21 Inverter 22 Capacitor 61, 61a Failure detection part 101 Motor 102 Generator 103 Engine A, B , C Switches L1, L2, L3 Main lines LA, LB, LC Control lines R Resistors SW1, SW2, SW3 Contactors SW1a, SW2a, SW3a Open / close contacts SW1b, SW2b, SW3b Coils T1, T2 Connection terminals

Claims (13)

Battery,
A first terminal and a second terminal for supplying the voltage of the battery to an external circuit;
A first main wiring connecting one electrode of the battery and the first terminal;
A second main wiring connecting the other electrode of the battery and the second terminal;
A first opening / closing part that includes a first coil and switches the first main wiring between a conductive state and a cut-off state by turning on and off according to a current flowing through the first coil;
A first control wiring connected to the first coil and through which a current supplied to the first coil flows;
A current detection element that has an annular loop portion through which any one of the first main wiring and the second main wiring and the first control wiring are inserted, and that detects a current passing through the loop portion; A battery power supply device comprising: A second opening / closing section that includes a second coil and switches the second main wiring between a conductive state and a cut-off state by turning on and off according to a current flowing through the second coil;
A second control wiring connected to the second coil and through which a current supplied to the second coil flows;
The battery power supply device according to claim 1, wherein the second control wiring is further inserted into the loop portion. A third main wiring connecting the one electrode of the battery and the first terminal via a resistor;
A third opening / closing portion that includes a third coil and switches the third main wiring between a conductive state and a cut-off state by turning on and off according to a current flowing through the third coil;
A third control wiring connected to the third coil and through which a current supplied to the third coil flows;
A failure detection unit that detects a failure related to the first, second, and third opening / closing units based on the current detected by the current detection element;
The loop portion is further inserted with the third control wiring,
The external circuit is
3. A stop period in which a direct current does not flow before starting, a standby period in which a direct current does not flow after being started, and an operation period in which a load current flows after the standby period has elapsed. The battery power supply device described. The failure detection unit
Based on the current detected by the current detection element during the process of stopping the current supply to the first, second, and third coils during the stop period, the first, second, and second The battery power supply device according to claim 3, wherein a failure relating to the three opening / closing parts is detected. The failure detection unit
Based on the current detected by the current detection element during the process of stopping the current supply to the first coil and supplying the current to the second and third coils during the standby period, the second The battery power supply device according to claim 3, wherein a failure relating to the third opening / closing part is detected. The second control wiring and the third control wiring are:
The number of windings around the loop part is different from each other,
The failure detection unit
Based on the current detected by the current detection element during the process of stopping the current supply to the first coil and supplying the current to the second and third coils during the standby period, The detection process which detects the failure regarding a 3rd opening / closing part is performed, and when the said failure is detected, it is determined whether the detected failure is a failure regarding which of the said 2nd and 3rd opening / closing part. Or the battery power supply device of 4. The failure detection unit
The current detected by the current detection element after the current detected by the current detection element is in a steady state after starting the current supply to the second and third coils when executing the detection process The battery power supply device according to claim 6, wherein a failure relating to the second and third opening / closing parts is detected based on the above. The failure detection unit
Based on the current detected by the current detection element during the process of stopping the current supply to the third coil and supplying the current to the first and second coils during the operation period, The battery power supply device of any one of Claims 3-7 which detects the failure regarding an opening-and-closing part. A third main wiring connecting the one electrode of the battery and the first terminal via a resistor;
A third opening / closing portion that includes a third coil and switches the third main wiring between a conductive state and a cut-off state by turning on and off according to a current flowing through the third coil;
A third control wiring connected to the third coil and through which a current supplied to the third coil flows;
A failure detection unit that detects a failure related to the first and third switching units based on the current detected by the current detection element;
The loop portion is further inserted with the third control wiring,
The external circuit is
2. A stop period in which a direct current does not flow before the start, a standby period in which a direct current does not flow after the start, and an operation period in which a load current flows after the standby period elapses. The battery power supply device described.   A failure detection unit for detecting a failure related to the first opening / closing unit based on a current detected by the current detection element during a process of supplying a current to the first coil via the first control wiring; The battery power supply device according to claim 1 provided. The failure detection unit further includes:
The failure related to the second opening / closing unit is detected based on a current detected by the current detection element during a process of supplying a current to the second coil via the second control wiring. Battery power unit. A third main wiring connecting the one electrode of the battery and the first terminal via a resistor;
A third opening / closing portion that includes a third coil and switches the third main wiring between a conductive state and a cut-off state by turning on and off according to a current flowing through the third coil;
A third control wiring connected to the third coil and through which a current supplied to the third coil flows;
The battery power supply device according to claim 1, wherein the third control wiring is further inserted in the loop portion. The failure detection unit further includes:
The failure related to the third opening / closing unit is detected based on the current detected by the current detection element during the process of supplying current to the third coil via the third control wiring. Battery power unit.

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