JP2018057127A - Power supply controller and power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make disconnection of a switch faster than the conventional one.SOLUTION: A power supply controller controlling a power supply device that supplies power of a battery pack to an inverter via a main contactor and a sub contactor opened/closed by applying driving currents S3, S6 to exciting coils L1, L2 includes driving circuits 9A, 9B that supply the driving currents S3, S6 to the exciting coils L1, L2, and a battery ECU that detects an overvoltage of the battery pack, and on the basis of this detection result, generates first control signals S1, S4 and second control signals S2, S5 to be supplied to the driving circuits 9A, 9B. The driving circuits 9A, 9B include a drive transistor 9c that switches between application and non-application of the driving currents by opening/closing on the basis of the first control signals S1, S4, and a power consumption circuit C that consumes counter electromotive forces of the exciting coils L1, L2 on the basis of the second control signals S2, S5.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power supply control device and a power supply system.

  The following Patent Document 1 discloses a control device for a power storage device that accurately detects the operation of a CID (Current Interrupt Device) provided in a power storage device in which a plurality of battery cells provided with is connected in series. The control device of the power storage device uses the deviation (first deviation) between the output voltage of the power storage device and the input voltage from the power storage device to the load device at a predetermined timing as a reference deviation, and outputs the output after the timing. The presence or absence of CID operation is determined by comparing the difference between the voltage and the input voltage (second deviation) and the difference value of the reference deviation with a predetermined threshold value. Moreover, if the control apparatus of this electric apparatus determines the action | operation of CID, it will open the system main relay provided between the electrical storage apparatus and the load apparatus.

Japanese Patent No. 5561114

  By the way, since the output voltage of the power storage device abnormally increases when the CID operates, it is necessary to open the system main relay promptly in order to reliably protect the load device. However, although the above-described control device for the power storage device opens the system main relay (switch) when the operation of the CID is determined, it does not include a technique relating to the immediateness of the opening.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to speed up the opening of a switch as compared with the prior art.

  In order to achieve the above object, in the present invention, as a first solving means related to a power supply control device, a power supply for supplying power of a DC power supply to a load via a switch that opens and closes by energization of a drive current to an exciting coil A power supply control device for controlling a device, wherein a drive circuit that supplies the drive current to the excitation coil, a voltage detection unit that detects an overvoltage of the DC power supply, and the drive based on a detection result of the voltage detection unit A control unit that generates a first control signal and a second control signal to be supplied to the circuit, and the drive circuit opens / closes based on the first control signal to energize / de-energize the drive current And a power consuming circuit for consuming the back electromotive force of the exciting coil based on the second control signal.

  In the present invention, as a second solving means relating to the power supply control device, in the first solving means, the main switch is connected to the other end of the exciting coil, one end of which is connected to the high potential side output terminal of the dedicated power source. An input terminal is connected, an output terminal is connected to a low-potential side output terminal of the dedicated power source, and the first control signal is input to a control terminal. The power consuming circuit has a cathode terminal connected to the control terminal. A constant voltage diode connected to a terminal, an anode terminal connected to the input terminal, one end connected to the control terminal, the other end connected to the output terminal, and one end connected to the input terminal A series connection circuit having the other end connected to the high-potential side output terminal of the dedicated power source, the series connection circuit having an auxiliary switch that opens and closes by the second control signal, and an anode terminal Comprising a cathode terminal while located on the side of the entry power terminal and a diode which is located on the side of the high-potential side output terminal of said exclusive power supply, employing a means of.

  In the present invention, as a third solving means relating to the power supply control device, in the first solving means, the main switch is connected to the other end of the exciting coil whose one end is connected to the high potential side output terminal of the dedicated power source. An input terminal is connected, an output terminal is connected to a low-potential side output terminal of the dedicated power source, and the first control signal is input to a control terminal. The power consuming circuit has a cathode terminal at the dedicated terminal A diode connected to the high potential side output terminal of the power supply, an anode terminal connected to the anode terminal of the diode, a cathode terminal connected to the input terminal, and one end of the anode terminal of the constant voltage diode An auxiliary switch connected to the cathode terminal of the constant voltage diode and opened and closed by the second control signal. To adopt a stage.

  In the present invention, as a fourth solving means related to the power supply control device, in the first to third solving means, the power supply device supplies electric power to a vehicle driving inverter as a load. Is adopted.

  Further, in the present invention, as a solution means related to the power supply system, the power supply control device according to any one of the first to fourth solution means, and the power supply device that is a control target of the power supply control device is provided. Adopt means.

  According to the present invention, since the power consumption circuit that consumes the counter electromotive force of the exciting coil is provided, the opening of the switch can be made faster than the conventional one.

It is a block diagram which shows the function structure of the power supply system which concerns on one Embodiment of this invention. It is a circuit diagram which shows the detailed structure of the drive circuit in one Embodiment of this invention. 4 is a timing chart illustrating an operation of a drive circuit according to an embodiment of the present invention. It is a circuit diagram which shows the modification of the drive circuit in one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The power supply system in the present embodiment includes a power supply device and a power supply control device. The power supply device is mounted on a vehicle such as a hybrid car, a fuel cell vehicle, and an electric vehicle, and uses a DC power source such as a lithium ion battery or a nickel metal hydride battery as a power source. As shown in FIG. 1, the power supply device includes an assembled battery 1, a main contactor 2, and a sub contactor 3, and supplies traveling power to an inverter 4 and a traveling motor 5 that are loads.

  The power supply control device according to the present embodiment controls such a power supply device, and controls the power supply device to supply DC power to the inverter 4 that is a load. Such a power supply control device includes a first ammeter 6, a second ammeter 7, a battery ECU 8, and two drive circuits 9A and 9B. The motor ECU 10 in FIG. 1 is a travel control device that controls the inverter 4.

  The assembled battery 1 includes a plurality of battery cells connected in series, and includes a pair of output terminals, that is, a plus terminal P1 and a minus terminal P2. The assembled battery 1 supplies DC power to the inverter 4 (load) through the main contactor 2 connected to the plus terminal P1 and the sub contactor 3 connected to the minus terminal P2.

  Each battery cell includes a shut-off element called a CID (Current Interrupt Device), and mechanically opens one of the output ends (plus end and minus end) of the battery cell when the internal pressure becomes abnormally high. When such a CID is activated and one of the output terminals of the battery cell is opened, the assembled battery 1 cannot supply DC power to the outside, and the output voltage deviates from a predetermined normal voltage range. Overvoltage.

  FIG. 1 shows a state where a CID is provided at the positive end of each battery cell. In this state, the positive end of the battery cell is opened by the operation of the CID due to abnormal internal pressure of the battery cell. Further, the output ends (plus end and minus end) of each battery cell having such a CID are connected to the input end of the battery ECU 8 as shown in the figure.

  The main contactor 2 is a switch that opens and closes by energization of a drive current to the exciting coil L1 (see FIG. 2). That is, the main contactor 2 places the pair of contacts in a connected state or a disconnected state by displacing the movable piece by the action of the magnetic force generated by the exciting coil L1 based on the drive current input from the drive circuit 9A. Is. In such a main contactor 2, one contact is connected to the plus terminal P <b> 1 of the assembled battery 1, and the other contact is connected to the first input terminal of the inverter 4.

  The sub-contactor 3 has a configuration similar to that of the main contactor 2 and is a switch that opens and closes when a drive current is supplied to the exciting coil L2 (see FIG. 2). The sub-contactor 3 operates based on the drive current supplied from the drive circuit 9B to the exciting coil L2, and one contact is connected to the negative terminal P2 of the assembled battery 1, and the other contact is the inverter 4 Connected to the second input end.

  That is, the main contactor 2 and the sub contactor 3 as described above are power supply switches that turn ON / OFF the power supply from the assembled battery 1 to the inverter 4. Although not shown, a smoothing capacitor is provided between the other contact of the main contactor 2 and the other contact of the sub contactor 3. This smoothing capacitor is for stabilizing the voltage of the DC power supplied from the assembled battery 1 to the inverter 4 via the main contactor 2 and the sub contactor 3.

  The inverter 4 is a three-phase inverter having a first input terminal, a second input terminal, and first to third output terminals. DC power is input from the positive terminal P1 and the negative terminal P2 of the assembled battery 1 to the first input terminal and the second input terminal of the inverter 4, and based on a switching signal (for example, PWM signal) input from the motor ECU 10. First to third by converting the DC power input to the first input terminal and the second input terminal into AC power (three-phase AC power) of a predetermined frequency and three phases (U phase, V phase, W phase). Output from the output terminal.

  The travel motor 5 is a three-phase motor that generates rotational power using the three-phase AC power supplied from the inverter 4 as drive power (motor drive power). The vehicle in the present embodiment travels with the rotational power generated by the travel motor 5. Such a traveling motor 5 is, for example, a three-phase DC motor having excellent controllability. The inverter 4 for driving the traveling motor 5 is a traveling inverter.

  The first ammeter 6 is provided between the plus terminal P1 of the assembled battery 1 and one contact point of the main contactor 2, detects the current flowing from the assembled battery 1 to the main contactor 2, and performs the first detection. The current I1 is output to the battery ECU 8. The second ammeter 7 is provided between the other contact of the main contactor 2 and the first input terminal of the inverter 4, detects a current flowing from the main contactor 2 to the inverter 4, and detects a second detected current. It is output to the motor ECU 10 as I2.

  The battery ECU 8 includes a predetermined control program, a voltage at the output terminal input from each battery cell, a first detection current I1 input from the first ammeter 6, a control command input from the motor ECU 10, and a second This is a software control device that controls the pair of drive circuits 9A and 9B based on the detected current I2 and the like. That is, the battery ECU 8 exchanges signals with the storage unit that stores the control program, the calculation unit that executes the control program, and the external elements (the assembled battery 1, the pair of drive circuits 9A and 9B, and the motor ECU 10) that are interconnected. The interface part etc. which perform are provided.

  Although details will be described later, the battery ECU 8 detects the voltage between the terminals of each battery cell as a cell voltage by processing the voltage at the output end of each battery cell input from the assembled battery 1 based on the control program. At the same time, the operation of the CID in each battery cell is detected based on the first detection current I1 and the second detection current I2. Further, the battery ECU 8 generates the first control signals S1 and S4 and the second control signals S2 and S5 based on the operating state of the CID.

  Here, the operation of the CID in each battery cell is a phenomenon that causes an overvoltage of the output voltage of the assembled battery 1. Therefore, detecting the operation of the CID in each battery cell based on the first detection current I1 and the second detection current I2 is synonymous with detecting the overvoltage of the assembled battery 1. Therefore, the 1st ammeter 6, the 2nd ammeter 7, and terry ECU8 in this embodiment are equivalent to the voltage detection part in the present invention. Further, the battery ECU 8 that generates the first control signals S1 and S4 and the second control signals S2 and S5 based on the detection result of the voltage detection unit, that is, the operating state of the CID corresponds to the control unit in the present invention. .

  The first control signal S1 output from the battery ECU 8 to the drive circuit 9A may be slightly different in output timing, but is the same as the first control signal S4 output from the battery ECU 8 to the drive circuit 9B. It is a signal of the form. Further, the second control signal S2 output from the battery ECU 8 to the drive circuit 9A may be slightly different in output timing, but the second control signal S5 output from the battery ECU 8 to the drive circuit 9B. It is a signal of the same form.

  Of the pair of drive circuits 9A and 9B, one drive circuit 9A sets the open / close state of the main contactor 2 by outputting the first drive current S3 to the exciting coil L1 of the main contactor 2. That is, the drive circuit 9A generates a first drive current S3 based on the first control signal S1 and the second control signal S2 input from the battery ECU 8, and uses the first drive current S3 as the main contactor. 2 to the exciting coil L1.

  The other drive circuit 9B sets the open / close state of the sub-contactor 3 by outputting the second drive current S6 to the exciting coil L2 of the sub-contactor 3. That is, the drive circuit 9B generates a second drive current S6 based on the first control signal S4 and the second control signal S5 input from the battery ECU 8, and uses the second drive current S6 as a sub-contactor. 3 to the exciting coil L2.

  Such a pair of drive circuits 9A and 9B have the same circuit configuration as shown in FIG. That is, the drive circuits 9A and 9B include a first resistor 9a, a second resistor 9b, a drive transistor 9c (main switch), a constant voltage diode 9d (zener diode), a diode 9e (silicon diode), and an auxiliary switch 9f. ing.

  These drive circuits 9A and 9B output a predetermined positive voltage (plus voltage) from the high potential side output terminal, and receive power supply from a dedicated power source Vcc whose low potential side output terminal is connected to GND (ground potential). Operate. Further, one end of each of the exciting coils L1 and L2 to be driven by the drive circuits 9A and 9B is connected to a dedicated power source Vcc (high potential side output terminal).

  The first resistor 9a has one end connected to the output terminal of the drive circuit 9A or 9B and the other end connected to one end of the second resistor 9b, the gate terminal of the drive transistor 9c, and the anode terminal of the constant voltage diode 9d. Has been. One end of the second resistor 9b is connected to the other end of the first resistor 9a, the gate terminal of the driving transistor 9c, and the anode terminal of the constant voltage diode 9d. The other end is connected to GND (ground potential).

  The drive transistor 9c is an N-channel MOS field effect transistor as shown in the figure, and has a gate terminal (control terminal) of the other end of the first resistor 9a, one end of the second resistor 9b, and an anode terminal of the constant voltage diode 9d. The drain terminal (input terminal) is connected to the anode terminal of the diode 9e and the other end of the exciting coil L1 or exciting coil L2, and the source terminal (output terminal) is connected to GND (ground potential).

  The drive transistor 9c is turned off (open) or on (closed) based on the first control signals S1 and S4 input to the gate terminal via the first resistor 9a. Switching between energization / non-energization of the drive currents S3 and S6 is performed. That is, the drive transistor 9c is in an OFF state (open state) when the first control signals S1 and S4 are at an L (low) potential, and when the first control signals S1 and S4 are at an H (high) potential. As a result, when the first control signals S1 and S4 are at the H (high) potential, the drive currents S3 and S6 are supplied to the exciting coils L1 and L2, and the first control signals S1 and S4 are turned on. When S4 is at the L (low) potential, energization of the drive currents S3 and S6 to the exciting coils L1 and L2 is stopped.

  The constant voltage diode 9d has an anode terminal connected to the other end of the first resistor 9a, one end of the second resistor 9b, and a gate terminal of the drive transistor 9c, a cathode terminal connected to the drain terminal of the drive transistor 9c, and an anode of the diode 9e. The terminal and the other end of the exciting coil L1 or exciting coil L2 are connected.

  The diode 9e is a general silicon diode, whose anode terminal is connected to the drain terminal of the drive transistor 9c, the cathode terminal of the constant voltage diode 9d, and the other end of the exciting coil L1 or exciting coil L2, and the cathode terminal is the auxiliary switch 9f. Is connected to one of the contacts.

  The auxiliary switch 9f has one contact connected to the cathode terminal of the diode 9e and the other contact connected to the dedicated power supply Vcc (high potential side output terminal). The auxiliary switch 9f is an open / close switch in which a pair of contacts are connected or disconnected by the second control signals S2 and S5. For example, the auxiliary switch 9f is closed when the second control signals S2 and S5 are at an H (high) potential, and is open when the second control signals S2 and S5 are at an L (low) potential.

  The diode 9e and the auxiliary switch 9f constitute a series connection circuit in which one end is connected to the drain terminal (input terminal) of the drive transistor 9c and the other end is connected to the dedicated power source Vcc (high potential side output terminal). ing. The diode 9e in this series connection circuit has an anode terminal located on the drain terminal (input terminal) side of the drive transistor 9c and a cathode terminal located on the dedicated power supply Vcc (high potential side output terminal) side. .

  Here, although details will be described later, the second resistor 9b, the constant voltage diode 9d, the diode 9e, and the auxiliary switch 9f among the above-described components of the drive circuits 9A and 9B are the same as the drive transistor 9c that is the main switch. In the OFF state (open state), the power consumption circuit C is configured to consume the back electromotive force of the excitation coil L1 or the excitation coil L1 based on the second control signal S2 or the second control signal S5.

  Subsequently, the motor ECU 10 is a software control device that controls the rotation of the traveling motor 5 by controlling the inverter 4 based on a predetermined control program, a control command input from a host control system, or the like. That is, the motor ECU 10 includes a storage unit that stores the control program, a calculation unit that executes the control program, and an interface unit that exchanges signals with interconnected external elements (such as the battery ECU 8 and the host control system). ing. In addition, the motor ECU 10 outputs the second detected current input from the second ammeter 7 to the battery ECU 8.

  Next, the operation of the power supply system configured as described above, in particular, the operation of each of the drive circuits 9A and 9B that are components of the power supply control device will be described in detail with reference to the timing chart of FIG.

  In this power supply system, each drive circuit 9A, 9B of the power supply control device sets the main contactor 2 and the sub contactor 3 of the power supply device to the closed state, whereby the DC power of the assembled battery 1 is supplied to the inverter 4, and the motor ECU 10 By supplying a switching signal to the inverter 4, a desired motor driving power is supplied from the inverter 4 to the traveling motor. And a motor vehicle drive | works when the traveling motor 5 rotates according to motor drive electric power.

  Here, when some abnormality occurs in the assembled battery 1 and an overvoltage that is higher than the normal voltage is applied from the assembled battery 1 to the inverter 4 (load), the inverter 4 may be damaged by the overvoltage. Such an overvoltage can occur, for example, when the CID of each battery cell constituting the assembled battery 1 is activated. In order to accurately protect the inverter 4 serving as a load against such an overvoltage of the assembled battery 1, it is necessary to open the main contactor 2 and the sub contactor 3 as soon as possible when an overvoltage occurs. is there.

  The power supply control device according to the present embodiment operates as follows with respect to the overvoltage of such a power supply device (the assembled battery 1). That is, when starting power supply from the assembled battery 1 to the inverter 4, the battery ECU 8 of the power supply control device changes the first control signals S 1 and S 4 from L (low) potential to H at time t 1 as shown in FIG. (High) Change to potential. As a result, the drive transistor 9c changes from the OFF state to the ON state, and the drain voltage Vd of the drive transistor 9c becomes GND (ground potential). As a result, energization of the drive currents S3 and S6 to the excitation coils L1 and L2 starts. To do.

  When the first control signals S1 and S4 maintain the H (high) potential for a certain period T1, the drive transistor 9c is maintained in the ON state, and thus the drive currents S3 and S6 gradually increase during this period T1. Then, the main contactor 2 and the sub contactor 3 are completely closed, and DC power is supplied from the assembled battery 1 to the inverter 4. Further, as shown in FIG. 3, the battery ECU 8 changes the second control signals S2 and S5 from the L (low) potential to the H (high) potential at the time t1, and sets the auxiliary switch 9f to the closed state.

  Then, after the time t2 when the period T1 has elapsed from the time t1, the battery ECU 8 transmits the first control signals S1 and S4 that repeat the L (low) potential and the H (high) potential in a predetermined cycle to the drive circuits 9A and 9B. To drive the drive transistor 9c so that the ON state and the OFF state are repeated at a predetermined cycle, thereby holding the drive currents S3 and S6 at or above a predetermined holding current. The main contactor 2 and the sub-contactor 3 maintain the closed state when the drive currents S3 and S6 energized to the exciting coils L1 and L2 are held at the holding current or more.

  When the battery ECU 8 sets the main contactor 2 and the sub contactor 3 in the closed state in this way, the battery ECU 8 sequentially detects the cell voltage of each battery cell in the assembled battery 1 and monitors the state of the assembled battery 1. It is monitored whether or not the CID of the battery pack 1 is activated by comparing the first detection current I1 and the second detection current I2.

  Here, when any one of the plurality of CIDs incorporated in each battery cell is activated, the output terminal (plus terminal P1 and minus terminal P2) of the assembled battery 1 is directed toward the main contactor 2 and the sub contactor 3. Since DC power is not supplied, the first detection current I1 is “0”. That is, when any CID is activated, no current flows through the main contactor 2 and the sub contactor 3.

  On the other hand, a smoothing capacitor is provided on the load side of the main contactor 2 and the sub contactor 3, that is, between the other contact of the main contactor 2 and the other contact of the sub contactor 3. That is, even if the CID is activated, power is supplied from the smoothing capacitor toward the inverter 4, so the second detection current I <b> 2 does not become “0”. Therefore, when any CID is activated in the assembled battery 1, a clear difference occurs between the first detection current I1 and the second detection current I2.

  The battery ECU 8 determines that the CID is not operating when the first detection current I1 and the second detection current I2 having such properties are substantially the same, and the first detection current I1 and the second detection current I2 If the difference from the detected current I2 exceeds a predetermined threshold value, it is determined that the CID is activated. When the battery ECU 8 determines that the CID is not operating, that is, when the assembled battery 1 outputs an output voltage in a predetermined normal range, L (low) at a predetermined cycle of the first control signals S1 and S4. The state of repeating the potential and the H (high) potential is continued.

  On the other hand, when the CID is activated, that is, when the output voltage of the assembled battery 1 is in an overvoltage state due to the activation of the CID, the battery ECU 8 changes the second control signals S2 and S5 from the H (high) potential to the L level at time t3. By changing to (low) potential, the auxiliary switch 9f is changed from the closed state to the open state. The battery ECU 8 holds the drive transistor 9c in the OFF state (open state) by fixing the first control signals S1 and S4 to the L (low) potential after time t3. By holding (continuing) the OFF state (open state) of the drive transistor 9c, the drive currents S3 and S6 gradually decrease from the hold current as shown in FIG.

  Here, when the drive currents S3 and S6 decrease from the holding current, back electromotive force is generated in the exciting coils L1 and L2. That is, the other end of the exciting coils L1, L2, that is, the drain voltage Vd of the driving transistor 9c becomes a transiently high potential due to the counter electromotive force, but the auxiliary switch 9f is set from the closed state to the open state at time t3. Thus, the constant voltage diode 9d starts functioning as a clamp diode.

  That is, when the constant voltage diode 9d is changed from the OFF state to the ON state by the back electromotive force, the potential of the other end of the exciting coils L1 and L2 is changed to the gate voltage of the drive transistor 9c, that is, the L (low) potential. Clamped to a voltage obtained by adding the Zener voltage of 9d. Further, when the constant voltage diode 9d is turned on, a current caused by the back electromotive force flows to GND (ground potential) through the constant voltage diode 9d and the second resistor 9b. Then, the current caused by the counter electromotive force flows through the constant voltage diode 9d and the second resistor 9b, so that the back electromotive force is heated by the internal resistance of the constant voltage diode 9d and the resistance value of the second resistor 9b (thermal energy). ) To be consumed.

  In the drive circuits 9A and 9B in this embodiment, since the power consuming circuit C actively consumes the counter electromotive force generated in the exciting coils L1 and L2, the drive currents S3 and S6 are changed as shown in FIG. Fall time T2 (time t3 to t4) is shorter than when power consumption circuit C is not provided (that is, when back electromotive force is not actively consumed). That is, according to the drive circuits 9A and 9B, since the power consuming circuit C is provided, the main contactor 2 and the sub contactor 3 can be changed from the closed state to the open state in a shorter time than before.

  For example, as a contactor control method in a power supply device for a vehicle, there is a method in which the contactor is shifted from a closed state to an open state by gradually reducing the duty ratio of a drive transistor of an exciting coil. In such a control method, it is possible to suppress the generation of noise when the contactor is changed from the closed state to the open state, but since the power consumption circuit C is not provided, the transition from the closed state of the contactor to the open state is performed. Time is relatively long. According to the present embodiment, when the main contactor 2 and the sub contactor 3 are shifted from the closed state to the open state, the power consuming circuit C acts and actively consumes the back electromotive force. Therefore, the main contactor 2 and the sub contactor 3 can be changed to the open state in a relatively short time.

  According to the present embodiment, the main contactor 2 and the sub contactor 3 can be changed from the closed state to the open state in a shorter time than in the prior art. It is possible to suppress or prevent the motor 5 from being damaged.

In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the drive circuits 9A and 9B shown in FIG. 2 are employed, but the present invention is not limited to this. Various configurations of the power consumption circuit in the present invention are conceivable. For example, the drive circuits 9D and 9E shown in FIG. 4 may be employed. In FIG. 4, the same reference numerals are given to electronic components that exhibit the same functions as those in FIG. 2.

  That is, the drive circuits 9D and 9E include a first resistor 9a, a drive transistor 9c (main switch), a constant voltage diode 9d (zener diode), a diode 9e (silicon diode), and an auxiliary switch 9f. Among these components, the constant voltage diode 9d (zener diode), the diode 9e (silicon diode), and the auxiliary switch 9f constitute a power consuming circuit Ca.

  The power consumption circuit Ca does not include the second resistor 9b in the drive circuits 9A and 9B, and the positional relationship between the diode 9e and the auxiliary switch 9f in the series connection circuit including the diode 9e and the auxiliary switch 9f is a drive circuit. The diode 9e and the auxiliary switch 9f of 9A and 9B are reversed. In the power consumption circuit Ca, the anode terminal of the constant voltage diode 9d is connected to the anode terminal of the diode 9e, and the cathode terminal is connected to the source terminal of the drive transistor 9c (that is, the other ends of the exciting coils L1 and L2). Yes.

  In such drive circuits 9D and 9E, when the CID is activated (when the assembled battery 1 is overvoltage), the auxiliary switch 9f is set to the open state by the second control signals S2 and S5, thereby the constant voltage diode 9d. Functions as a clamp diode. And the electric current resulting from the counter electromotive force of exciting coil L1, L2 is consumed by the internal resistance of the constant voltage diode 9d.

(2) In the above embodiment, the operation of the CID, that is, the overvoltage of the assembled battery 1 is determined based on the first detection current I1 and the second detection current I2, but the present invention is not limited to this. Various methods are conceivable for detecting the operation of the CID. For example, the cell voltage of each battery cell may be used.

  That is, when the CID is activated, the cell voltage of the battery cell of the activated CID becomes an abnormally high voltage, and this causes the output voltage of the assembled battery 1 to become an overvoltage. Therefore, by monitoring the cell voltage of each battery cell, The operation of the CID can be detected. In addition, when such a method is employ | adopted, the 1st ammeter 6 and the 2nd ammeter 7 can be deleted.

(3) In the above embodiment, the battery pack 1 in which each battery cell includes a CID has been described, but the present invention is not limited to this. In addition to the CID that operates based on the abnormal internal pressure of the battery cell, various elements can be considered as the interruption element provided in the assembled battery for safety measures.

(4) In the above embodiment, the control from the closed state to the open state of the main contactor 2 and the sub contactor 3 in the abnormal state when the CID of the battery cell is operated, that is, in the normal state of the assembled battery, When the ignition switch is switched from the ON state to the OFF state, the contactor is opened from the closed state while suppressing the generation of noise by gradually reducing the switching duty ratio of the drive transistor that drives the excitation coil of the contactor. There is something to shift to the state. The present invention may be applied to a power supply control device that controls the contactor when the assembled battery is normal.

1 Battery assembly 2 Main contactor (switch)
3 Sub contactor (switch)
4 Inverter 5 Traveling Motor 6 First Ammeter 7 Second Ammeter 8 Battery ECU
9A, 9B, 9D, 9E Drive circuit 9a First resistor 9b Second resistor 9c Drive transistor (main switch)
9d Constant voltage diode 9e Diode 9f Auxiliary switch C, Ca Power consumption circuit 10 Motor ECU

Claims (5)

A power supply control device that controls a power supply device that supplies power of a DC power supply to a load via a switch that opens and closes by energization of a drive current to an excitation coil,
A drive circuit for supplying the drive current to the exciting coil;
A voltage detector for detecting an overvoltage of the DC power supply;
A control unit that generates a first control signal and a second control signal to be supplied to the drive circuit based on a detection result of the voltage detection unit;
The drive circuit is
A main switch that switches between energization / non-energization of the drive current by opening and closing based on the first control signal;
And a power consuming circuit for consuming a back electromotive force of the exciting coil based on the second control signal. The main switch has an input terminal connected to the other end of the exciting coil whose one end is connected to the high potential side output terminal of the dedicated power source, an output terminal connected to the low potential side output terminal of the dedicated power source, and a control terminal A transistor to which the first control signal is input,
The power consumption circuit is:
A constant voltage diode having a cathode terminal connected to the control terminal and an anode terminal connected to the input terminal;
A resistor having one end connected to the control terminal and the other end connected to the output terminal;
A series connection circuit having one end connected to the input terminal and the other end connected to the high potential side output terminal of the dedicated power source;
The series connection circuit is:
An auxiliary switch opened and closed by the second control signal;
The power supply control device according to claim 1, further comprising: a diode having an anode terminal positioned on the input terminal side and a cathode terminal positioned on the high potential side output terminal side of the dedicated power supply. The main switch has an input terminal connected to the other end of the exciting coil whose one end is connected to the high potential side output terminal of the dedicated power source, an output terminal connected to the low potential side output terminal of the dedicated power source, and a control terminal A transistor to which the first control signal is input,
The power consumption circuit is:
A diode whose cathode terminal is connected to the high-potential side output terminal of the dedicated power source;
A constant voltage diode having an anode terminal connected to the anode terminal of the diode and a cathode terminal connected to the input terminal;
2. An auxiliary switch having one end connected to an anode terminal of the constant voltage diode, the other end connected to a cathode terminal of the constant voltage diode, and opened and closed by the second control signal. The power supply control device described.   The power supply control device according to any one of claims 1 to 3, wherein the power supply device supplies power as a load to an inverter for driving a vehicle. The power supply control device according to any one of claims 1 to 4,
A power supply system comprising: the power supply device to be controlled by the power supply control device.

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