JP4845756B2 - Power supply for vehicle - Google Patents

Description

  The present invention relates to a power supply device for a vehicle in which a large number of batteries are connected in series to increase an output voltage.

In order to increase the output of a power supply device for a vehicle, a large number of batteries are connected in series to increase the voltage. In this power supply device, batteries connected in series are charged with the same charging current and discharged with the same current. Therefore, if all the batteries have exactly the same characteristics, no imbalance occurs in the battery voltage or the remaining capacity. However, in reality, a battery having exactly the same characteristics cannot be manufactured. The battery imbalance is an imbalance of voltage and remaining capacity when charging and discharging are repeated. Furthermore, battery voltage imbalance causes overcharge or overdischarge of a specific battery. In order to prevent this problem, a power supply device for a vehicle that detects the voltage of each battery and eliminates the imbalance has been developed. (See Patent Document 1)
JP 2006-149068 A

  The power supply device for vehicles described in patent document 1 has connected the discharge circuit in parallel with each battery which comprises a series battery group. The discharge circuit is a series circuit of a discharge resistor and a switching element. This power supply apparatus discharges a battery whose voltage has been increased by a discharge circuit to eliminate battery imbalance. A discharge circuit that discharges a battery switches a switching element on and discharges a specific battery with a discharge resistor to lower the voltage. Further, the power supply device detects disconnection of the connection line connected to the battery electrode, and stops the equalization operation when the disconnection of the connection line is detected. As a result, this power supply apparatus prevents the inconvenience of equalization when the connection line is disconnected.

By the way, the power supply device mounted on the vehicle outputs an equalization signal to the equalization circuit from the vehicle side, and starts the equalization operation of the series battery group. This power supply device is equipped with a device such as an MPU for controlling the equalization circuit on the vehicle side, and uses an electrical battery mounted on the vehicle side as its power supply. The reason why the battery for electrical equipment is used as the power source of the MPU or the like that controls the equalization circuit is as follows.
(1) Since the output voltage of the series battery group that drives the vehicle is high, the circuit configuration for use as a driving power source such as an MPU becomes complicated and the cost increases. In addition, insulation measures are required.
(2) Power can be partially supplied from the series battery group to lower the output voltage, but in this case, the balance of the voltage and remaining capacity of the series battery group is lost.
(3) Since the voltage of the battery for electrical equipment is close to the voltage for driving the MPU or the like, the supplied power can be easily obtained.
For these reasons, a battery for electrical equipment is used as a power source on the vehicle side that controls the equalization circuit, but this power supply device starts the equalization operation with an equalization signal from the vehicle side, If the electrical battery fails or power is not normally supplied from the electrical battery due to disconnection of the output line of the electrical battery, normal equalization operation cannot be guaranteed. In addition, the battery equalization operation is easier when the vehicle is stopped. However, when the vehicle is stopped, the electrical battery is not charged by the electrical battery. There is also a problem that the battery is continuously discharged and the voltage drops. In a device that discharges and equalizes a battery when power is not normally supplied from the electrical battery and the equalization circuit cannot be controlled normally, the battery is overdischarged or charged. In the equalizing apparatus, there is a drawback that the battery is overdischarged and the battery is significantly deteriorated.

  The present invention has been developed for the purpose of solving this drawback. An important object of the present invention is for a vehicle capable of preventing the deterioration of the battery by preventing the adverse effect of the equalization circuit on the battery when the electrical battery fails or when the power supply line of the electrical battery is disconnected. It is to provide a power supply apparatus.

The vehicle power supply device of the present invention has the following configuration in order to achieve the above-described object.
A power supply device for a vehicle discharges or charges a series battery group 10 formed by connecting a plurality of rechargeable batteries 11 that supply power to a motor that drives the vehicle in series, and the battery 11 that constitutes the series battery group 10. Then, the equalization circuit 20 for equalizing the electric characteristics of each battery 11, the main MPU 30 for controlling the equalization circuit 20 using the battery 40 for electrical equipment as a power source, and the equalization operation of the equalization circuit 20 for the electrical equipment of the vehicle And a stop circuit 50 that detects and controls the voltage of the battery 40. The stop circuit 50 detects that the voltage of the electrical battery 40 is outside the set range, and stops the equalization operation in which the equalization circuit 20 charges or discharges the battery 11. A regulator 41 that supplies power to the stop circuit 50 and a capacitor 42 that is charged by the electrical battery 40 are connected to the output side of the electrical battery 40. The stop circuit 50 is supplied with power from the regulator 41 that is maintained in an operating state by the power charged in the capacitor 42, and outputs a stop signal to the equalization circuit 20.

  In the vehicle power supply device according to claim 2 of the present invention, in addition to the configuration of claim 1, the stop circuit 50 detects the voltage of the electrical battery 40 and stops the equalization circuit 20 from stopping the equalization operation. The voltage detection part 51 which outputs a signal is provided.

The vehicle power supply device according to claim 3 of the present invention supplies power from the series battery group 10 to the power supply circuit 26 of the equalization circuit 20 in addition to the configuration of claim 1 , and the stop circuit 50 is insulated. A stop signal is transmitted to the equalization circuit 20 via the mold signal converter 60.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the equalizing circuit 20 includes a discharge circuit 21 in which a switching element 23 is connected in series to a discharge resistor 22, and a series battery. And a control circuit 24 that detects the cell voltage of the batteries 11 constituting the group 10 and controls the switching element 23 to be turned on and off.

  According to the vehicle power supply device of the present invention, the equalization circuit has a bad influence on the battery even if the electrical battery mounted on the vehicle fails or the power supply line of the electrical battery is disconnected. There is a feature that can effectively prevent deterioration of the battery in this state. The power supply device of the present invention includes a stop circuit that detects the voltage of the electrical battery and controls the equalization operation of the equalization circuit. With this stop circuit, the voltage of the electrical battery is outside the set range. This is because the equalization operation of the equalization circuit is stopped in this state.

  Furthermore, the vehicle power supply apparatus according to claim 2 of the present invention is a stop that detects the voltage of the battery for electrical equipment and stops the equalization circuit by the stop circuit, in addition to the configuration of claim 1. A voltage detector for outputting a signal is provided. In this power supply device, when the voltage of the electric equipment battery falls outside the set range or when the output of the electric equipment battery is cut off, this is detected by the voltage detector and the equalization circuit stops the equalization operation. Is done. Furthermore, even when the voltage of the battery for electrical equipment rises outside the set range, the power supply device detects this and stops the equalization operation of the equalization circuit, further improving safety. it can.

  According to a third aspect of the present invention, in addition to the configuration of the first aspect, the power supply device for a vehicle has a regulator for supplying power to the stop circuit on the output side of the electric equipment battery and a capacitor charged by the electric equipment battery. The stop circuit is supplied with power from a regulator that is maintained in an operating state by the power charged in the capacitor, and outputs a stop signal to the equalization circuit. This power supply device is a simple circuit, and even when the output voltage of the electrical equipment battery is instantaneously reduced to 0 V or significantly reduced, and the stop signal cannot be output with the power supplied from the electrical equipment battery, the capacitor It is characterized in that the stop signal can be reliably output while maintaining the regulator in the operating state with the electric power stored in the capacitor.

  The vehicle power supply device according to claim 4 of the present invention, in addition to the configuration of claim 3, supplies a high voltage from the series battery group to the power supply circuit of the equalization circuit, and is isolated from the stop circuit. A stop signal is transmitted to the equalization circuit via the signal converter. This power supply device can transmit a stop signal from the stop circuit to the equalization circuit as a simple circuit configuration while insulating the ground lines of the equalization circuit and the stop circuit.

  Furthermore, a vehicle power supply device according to claim 5 of the present invention includes, in addition to the configuration of claim 1, an equalization circuit, a discharge circuit in which a switching element is connected in series to a discharge resistor, and a series battery group. And a control circuit that detects the cell voltage of the battery that controls the on / off of the switching element. This equalization circuit can perform equalization by switching a switching element on and off by a control circuit and discharging a specific battery.

  Embodiments of the present invention will be described below with reference to the drawings. However, the following embodiment exemplifies a power supply device for a vehicle for embodying the technical idea of the present invention, and the present invention does not specify the power supply device as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The vehicle power supply device shown in FIG. 1 includes a series battery group 10 in which a plurality of rechargeable batteries 11 that supply power to a motor that drives the vehicle are connected in series, and a battery 11 that constitutes the series battery group 10. The equalization circuit 20 that equalizes the electrical characteristics of the respective batteries 11 by discharging or charging the battery, and the stop circuit 50 that detects and controls the equalization operation of the equalization circuit 20 by detecting the voltage of the electric battery 40 of the vehicle. With.

  The equalization circuit 20 equalizes the cell voltage of the battery 11 to eliminate imbalance. The battery 11 of the series battery group 10 is a lithium ion secondary battery. However, a nickel metal hydride battery or a nickel cadmium battery can also be used. Ideally, the equalization circuit 20 detects the voltage of one battery 11 as a cell voltage, and eliminates the cell voltage imbalance of each battery 11. However, the power supply device of the present invention can also eliminate a battery module voltage imbalance by connecting a plurality of batteries in series to form a battery module and using the voltage of the battery module as a cell voltage. In the power supply device in which the battery 11 is a lithium ion secondary battery, the cell voltage is preferably one battery voltage. A power supply device using a nickel-metal hydride battery or a nickel-cadmium battery as a battery eliminates the voltage imbalance of the battery module using, for example, the voltage of the battery module in which a plurality of batteries are connected in series as the cell voltage.

  The equalization circuit 20 of FIG. 2 discharges the battery 11 having a high voltage by the discharge resistor 22 to eliminate the imbalance. However, the present invention does not specify an equalization circuit as a circuit that discharges a battery with a discharge resistor. For example, the equalization circuit may discharge a battery having a high voltage to a capacitor or a battery or the like and store it in the battery, and discharge the charge of the battery to a battery having a low voltage to eliminate the voltage difference between the batteries. it can.

  2 includes a discharge circuit 21 in which a switching element 23 is connected in series to a discharge resistor 22, and a control circuit 24 that detects each cell voltage and controls the switching element 23 to be turned on and off. Prepare. The discharge resistor 22 and the discharge circuit 21 of the switching element 23 are connected in parallel with each battery 11. This equalization circuit 20 reduces the voltage of the battery 11 by switching the switching element 23 on by the control circuit 24 and discharging the battery 11 by the discharge resistor 22 when the cell voltage of the battery 11 becomes high. Equalize.

  Furthermore, the equalization circuit 20 in the figure has a cell voltage detection circuit 25 that detects the cell voltage of each battery 11. The equalization circuit 20 having the cell voltage detection circuit 25 is supplied with power from the series battery group 10. The equalization circuit 20 shown in the figure is operated by the output voltage (Vcc) of the power supply circuit 26 that is supplied with power from the series battery group 10. The voltage of series battery group 10 can be stepped down by a DC / DC converter that is power supply circuit 26 and supplied to equalization circuit 20, for example. According to this circuit configuration, even if the voltage of the series battery group 10 is high, it can be supplied to the equalization circuit 20 as the optimum voltage. The cell voltage detection circuit 25 connects the input terminal 28 of the sub voltage detection circuit 27 to each battery 11 in order to detect the cell voltage of each battery 11. However, a switching circuit (not shown) for switching the battery to be connected can be provided on the input side of the sub voltage detection circuit, and a plurality of cell voltages can be detected by one sub voltage detection circuit. The output signal of the sub voltage detection circuit 27 is input to the control circuit 24 via the multiplexer 29. The multiplexer 29 switches the output of the sub voltage detection circuit 27 in order and inputs it to the control circuit 24.

  The control circuit 24 compares the cell voltages of the respective batteries 11 and controls the switching elements 23 so as to equalize the cell voltages of all the batteries 11. The control circuit 24 turns on the switching element 23 of the discharge circuit 21 connected to the battery 11 that is too high and discharges it. The voltage of the battery 11 decreases as it discharges. The switching element 23 is switched from on to off when the voltage of the battery 11 decreases until it balances with the other batteries 11. When the switching element 23 is turned off, the discharge of the battery 11 is stopped. Thus, the control circuit 24 discharges the battery 11 having a high cell voltage, and balances the cell voltages of all the batteries 11.

  The power supply device of FIG. 1 includes two series battery groups 10A and 10B, and equalization circuits 20A and 20B are connected to the series battery groups 10A and 10B, respectively. The equalization circuits 20A and 20B equalize the batteries 11 of the series battery groups 10A and 10B. However, the unbalance between the two sets of series battery groups 10A and 10B is not eliminated. As shown in the figure, a power supply apparatus including a plurality of series battery groups 10A and 10B is not shown, but each series battery group is provided with a block discharge circuit composed of a series circuit of a discharge resistor and a switching element. Thus, each series battery group can be equalized. The block discharge circuit detects the total voltage of each series battery group and controls it by a block control circuit (not shown) that switches the switching element on and off. The block control circuit detects the total voltage of each series battery group, and switches on and discharges the switching element of the discharge circuit connected to the series battery group with the detected high total voltage, and discharges each series battery group. Equalize.

  The stop circuit 50 detects that the voltage of the electrical battery 40 is outside the set range, and stops the equalization operation in which the equalization circuit 20 charges or discharges the battery 11. The power supply apparatus shown in the figure includes a main MPU 30 that controls equalization of the equalization circuit 20. The equalization circuit 20 starts equalization of the series battery group 10 with an equalization signal input from the main MPU 30. The main MPU 30 specifies the timing at which the equalization circuit 20 equalizes the series battery group 10 based on the running state of the vehicle and the state of the ignition switch, and outputs the equalization signal when the equalization circuit 20 reaches the equalization operation timing. Output to the equalization circuit 20. For example, the main MPU 30 detects that the vehicle is stopped by turning off the ignition switch, and outputs an equalization signal to the equalization circuit 20.

  The main MPU 30 and the stop circuit 50 operate with electric power supplied from the vehicle electrical battery 40. The power supply device of FIG. 1 has a regulator 41 connected to the output side of the electrical battery 40, stabilizes the output voltage with the regulator 41, and supplies it to the power supply of the main MPU 30 and the stop circuit 50. Further, in the power supply device of FIG. 1, a capacitor 42 that is charged by the electrical battery 40 is connected to the output side of the electrical battery 40. The capacitor 42 is an electric field capacitor having a large capacitance, for example, a capacitance of several hundred μF to several thousand μF, preferably 1000 μF. The capacitor 42 is connected to the electrical equipment battery 40 via the diode 43. The diode 43 is connected in a direction in which the capacitor 42 can be charged by the electric equipment battery 40. The capacitor 42 holds the output voltage at a predetermined voltage value for a predetermined time and supplies it to the regulator 41 after the output voltage of the electrical battery 40 has dropped to 0V. In particular, a large-capacitance capacitor of several hundred μF or more maintains the regulator 41 in an operating state for a long time of several seconds to several tens of seconds and supplies the output voltage (VDD) of the regulator 41 to the main MPU 30 and the stop circuit 50. Keep it ready for operation. Further, in the circuit for charging the capacitor 42 from the electric battery 40 via the diode 43, even if the output of the electric battery 40 is short-circuited, the electric power stored in the capacitor 42 is not discharged on the electric battery 40 side, and the regulator 41 Is maintained in the operating state, and power is supplied from the regulator 41 to the main MPU 30 and the stop circuit 50 to maintain the operating state. Further, in the power supply device of FIG. 1, a capacitor 44 is also connected to the output side of the regulator 41. The capacitor 44 is charged with the power output from the regulator 41 and supplies power to the main MPU 30 and the stop circuit 50 for a predetermined period of time after the output voltage of the battery 40 for electrical equipment has dropped to be in an operating state. .

  Even after the output voltage of the electrical battery 40 has dropped to 0V, the power charged in the capacitor 42 is supplied from the regulator 41 that is maintained in the operating state for a predetermined time, and the power charged in the capacitor 44 The stop circuit 50 held in the operating state for a predetermined time detects that the voltage of the electrical battery 40 has dropped, and stabilizes in the equalization circuit 20 in a state where no power is supplied from the electrical battery 40. Can output a stop signal.

  The stop circuit 50 includes a voltage detection unit 51 that detects the voltage of the electrical battery 40 and outputs a stop signal that causes the equalization circuit 20 to stop the equalization operation. The voltage detection unit 51 stores a voltage setting range of the electrical battery 40 that stops the equalization operation. The voltage detection unit 51 detects the voltage of the battery 40 for electrical equipment, and when the detected voltage is outside the setting range, that is, when the voltage is lower than the lowest voltage of the setting range or higher than the highest voltage of the setting range, A stop signal for stopping the equalization operation is output to the circuit 20. This stop circuit 50 outputs a stop signal for stopping the equalization operation not only when the voltage of the electrical equipment battery 40 is reduced due to a failure or disconnection, but also when an overvoltage is input from the electrical equipment battery 40. . For example, when an overvoltage is input from the electrical battery 40, for example, when a 24V electrical battery is accidentally attached to a 12V electrical battery, or a charging circuit that charges the electrical battery 40 fails. is there. In such a case, the stop circuit 50 that stops the equalization operation of the equalization circuit 20 as an abnormality of the electrical battery 40 can further improve the safety of the power supply device. However, the stop circuit does not necessarily need to detect both the voltage drop of the electrical battery and the input of the overvoltage, and can detect only the voltage drop of the electrical battery and output a stop signal.

  The minimum voltage in the setting range stored by the voltage detection unit 51 is set to, for example, a half voltage of the electrical battery 40, or 6V for a 12V electrical battery. However, this set voltage can also be set in the range of 5V to 10V in a 12V electric battery. The maximum voltage in the set range is set to 1.5 times the voltage of the electrical battery, for example, 18V for a 12V electrical battery. However, this maximum voltage can also be set in the range of 16V to 20V in a 12V electric battery.

  The stop circuit 50 detects the voltage of the electrical battery 40 by the voltage detection unit 51, compares the detected voltage with a set range, and outputs a stop signal to the equalization circuit 20 when the detected voltage is outside the set range. . The stop signal output from the stop circuit 50 is input to the equalization circuit 20 via the insulation type signal converter 60.

  The insulated signal converter 60 shown in FIG. The photocoupler 61 turns on the light emitting diode 62 with a pulse signal that is a stop signal output from the stop circuit 50, and the light from the light emitting diode 62 is received by the phototransistor 63 to insulate the input side from the output side. A stop signal is transmitted from the stop circuit 50 to the equalization circuit 20. An insulated signal converter can use a transformer instead of a photocoupler. The transformer connects the primary side to the output of the stop circuit and the secondary side to the input of the equalization circuit, insulates the stop signal output from the stop circuit and transmits it to the equalization circuit. The insulation type signal converter 60 transmits a stop signal in an insulated state from the stop circuit 50 to the equalization circuit 20 without using a common ground. Since the power supply device of FIG. 1 includes two sets of equalization circuits 20A and 20B, the isolated signal converter 60 transmits a stop signal to both equalization circuits 20A and 20B. Stop equalization.

  Furthermore, the insulation type signal converter 60 shown in FIG. 2 uses the control circuit 24 to transmit data such as the voltage of each battery 11 and the total voltage of each series battery group 10 detected by the cell voltage detection circuit 25 of the equalization circuit 20. To the main MPU 30. The photocoupler 61 lights up the light emitting diode 62 with a pulse signal which is a data signal output from the control circuit 24, and the light from the light emitting diode 62 is received by the phototransistor 63 to insulate the input side from the output side. Then, the data signal is transmitted from the control circuit 24 to the main MPU 30. Therefore, the insulation type signal converter 60 can transmit the data signal in an insulated state without common grounding from the equalization circuit 20 to the main MPU 30.

  The power supply device in FIG. 1 outputs a stop signal output from the stop circuit 50 to the equalization circuit 20 and the main MPU 30. When the stop signal is input from the stop circuit 50, the main MPU 30 inputs a control signal for stopping the equalization operation of the equalization circuit 20 to the equalization circuit 20 via the insulation type signal converter 60. Further, the main MPU 30 includes a memory 31 that stores a stop signal input from the stop circuit 50. The memory 31 is an EEPROM or a flash memory. The main MPU 30 stores a stop signal input from the stop circuit 50 even after the power supplied from the electrical battery 40 is cut off. Therefore, when a stop signal is input from the stop circuit 50, even if this signal is stored and the main MPU 30 returns to a state where it is restarted, the equalization circuit 20 does not perform the equalization operation. This power supply device does not start the equalization operation of the equalization circuit 20 after the output of the battery 40 for electrical equipment has decreased. Therefore, in this power supply device, the voltage of the battery 40 for electric equipment temporarily decreases for some reason, and even if the voltage is restored after that, the equalization operation of the series battery group 10 is not performed. It can be protected more safely. After confirming that the electrical equipment battery 40 operates normally, the memory 31 is reset to a state where the equalization operation can be started.

The vehicle power supply device of FIG. 1 performs the following operation to equalize the series battery group.
(1) The state in which the output voltage of the electrical battery is normal In this state, the electrical battery 40 supplies a normal power supply voltage to the stop circuit 50 and the main MPU 30. In the apparatus of FIG. 1, a stabilized voltage is supplied to the stop circuit 50 and the main MPU 30 via the regulator 41. In this state, the stop circuit 50 and the main MPU 30 are in a normal operating state. On the other hand, the equalization circuit 20 is brought into a normal operation state when the power supply voltage is supplied from the series battery group 10. The main MPU 30 in the operating state determines whether to equalize the series battery group 10 and outputs an equalization signal to the equalization circuit 20 when it is time to equalize. The equalization signal is input from the main MPU 30 to the control circuit 24 of the equalization circuit 20 via the insulation type signal converter 60. The control circuit 24 has a built-in sub-MPU or a circuit that latches the input equalization signal. When the equalization signal is input, the control circuit 24 continues until the equalization of the series battery group 10 is completed. Operation. The control circuit 24 controls the switching element 23 of the discharge circuit 21 to be turned on and off to equalize the batteries 11.

(2) The state where the output of the electrical equipment battery is cut off or the output voltage is abnormally lowered During the equalization operation, when the output voltage of the electrical equipment battery 40 is cut off or the voltage drops abnormally, The stop circuit 50 detects this and outputs a stop signal to the equalization circuit 20 and the main MPU 30. When the output of the electrical equipment battery 40 is cut off, a normal power supply voltage is not supplied from the electrical equipment battery 40 to the stop circuit 50 and the main MPU 30. However, since the power supply device of FIG. 1 has a capacitor 42 connected to the output side of the battery 40 for electrical equipment, the regulator 41 is maintained in an operating state for a predetermined time with the power charged in the capacitor 42 to supply power. In addition, the power charged to the capacitor 44 connected to the output side of the regulator 41 is supplied, and the operating voltage is supplied to the stop circuit 50 and the main MPU 30 for several tens of seconds, for example. For this reason, even after the output of the battery 40 for electric equipment is interrupted, the stop circuit 50 and the main MPU 30 are maintained in an operating state for a predetermined time. The stop circuit 50 in the operating state outputs a stop signal that is a pulse signal, for example. This stop signal is output to the control circuit 24 of the equalization circuit 20 via the insulation type signal converter 60. The control circuit 24 detects the stop signal and stops the equalization operation. Further, the stop signal output from the stop circuit 50 is also output to the main MPU 30 held in the operating state. The main MPU 30 stores the stop signal in a memory 31 such as an EEPROM or a flash memory. Although the main MPU 30 is in an operating state for a predetermined time, the power supply voltage is not supplied thereafter and the main MPU 30 does not operate. However, the memory 31 stores the stop signal even when the power supply voltage is not supplied. For this reason, even if the charging voltage of the electrical battery 40 rises to a normal voltage, the main MPU 30 does not output the equalization signal for starting the equalization operation with the stored stop signal. Therefore, after the output of the electrical battery 40 is cut off or lowered, the main MPU 30 does not output an equalization signal and the equalization circuit 20 performs the equalization operation of the series battery group 10 unless the memory 31 is reset. Do not resume. When the electrical battery 40 is confirmed to be in a normal state and the memory 31 of the main MPU 30 is reset, the main MPU 30 outputs an equalization signal at the timing for equalizing the series battery group 10 to equalize the series battery group 10. Turn into.

It is a block diagram of the power supply device for vehicles concerning one example of the present invention. It is a block diagram which shows the equalization circuit of the power supply device shown in FIG.

Explanation of symbols

10 ... Series battery group 10A ... Series battery group
10B ... Series battery group 11 ... Battery 20 ... Equalization circuit 20A ... Equalization circuit
20B: Equalizing circuit 21 ... Discharge circuit 22 ... Discharge resistor 23 ... Switching element 24 ... Control circuit 25 ... Cell voltage detection circuit 26 ... Power supply circuit 27 ... Sub voltage detection circuit 28 ... Input terminal 29 ... Multiplexer 30 ... Main MPU
DESCRIPTION OF SYMBOLS 31 ... Memory 40 ... Battery for electric equipment 41 ... Regulator 42 ... Capacitor 43 ... Diode 44 ... Capacitor 50 ... Stop circuit 51 ... Voltage detection part 60 ... Insulation type signal converter 61 ... Photocoupler 62 ... Light emitting diode 63 ... Phototransistor

Claims (4)

A series battery group (10) in which a plurality of rechargeable batteries (11) for supplying electric power to a motor for running a vehicle are connected in series, and the battery (11) constituting the series battery group (10) is discharged or An equalization circuit (20) that charges and equalizes the electrical characteristics of each battery (11), and a main MPU (30) that controls the equalization circuit (20) using the electrical battery (40) as a power source, A stop circuit (50) for detecting and controlling the voltage of the vehicle electrical battery (40) for equalization operation of the control circuit (20),
It said stop circuit (50) detects the setting range of the voltage of the auxiliary battery (40), vehicle Ru stops the equalization operation equalizing circuit (20) for charging or discharging the battery (11) Power supply unit,
Connected to the output side of the electrical battery (40) is a regulator (41) for supplying power to the previous stop circuit (50) and a capacitor (42) charged by the electrical battery (40). (50) is supplied from a regulator (41) that is maintained in an operating state with power charged in the capacitor (42), and outputs a stop signal to the equalization circuit (20) . Power supply.   The said stop circuit (50) is provided with the voltage detection part (51) which detects the voltage of the battery (40) for electrical equipment, and outputs the stop signal which stops the equalization operation | movement to the equalization circuit (20). The vehicle power supply described. Power is supplied from the series battery group (10) to the power supply circuit (26) of the equalization circuit (20), and the stop circuit (50) equalizes the stop signal via the insulation type signal converter (60). The power supply device for a vehicle according to claim 1 , wherein the power supply device is transmitted to the circuit 20.   The equalization circuit (20) determines the cell voltage of the discharge circuit (21) in which the switching element (23) is connected in series to the discharge resistor (22) and the battery (11) constituting the series battery group (10). The power supply device for vehicles according to claim 1 provided with a control circuit (24) which detects and controls switching element (23) on and off.

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