JP2013074709A - Power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly discharge a high voltage side capacitor and a low voltage side capacitor, and prevent an inverter from overheating.SOLUTION: When a system main relay 43 emergently cuts off a battery 36, a lower arm of a step-up converter 40 with an upper arm kept off is switched to cause a charge stored in a low voltage side capacitor 46 to flow to the step-up converter 40, which consumes corresponding power, and when a motor 32 stops rotating, an upper arm of an inverter 34 with a lower arm kept on is switched to cause a charge stored in a high voltage side capacitor 48 to flow to the inverter 34, which consumes corresponding power. This can quickly electrically discharge the low voltage side capacitor 46 and the high voltage side capacitor 48 to prevent the inverter 34 from overheating.

Description

  More specifically, the present invention relates to a battery, an inverter, a boost converter provided between the battery and the inverter, a smoothing capacitor connected to the positive and negative buses of the inverter, and the battery. The present invention relates to a power supply apparatus including a system main relay that performs the above operation and a filter capacitor that is attached to a power line on the battery side from the boost converter.

  Conventionally, this type of power supply device includes two batteries, an inverter as a motor drive circuit, and a boost converter configured by two switching elements of an upper arm and a lower arm and connected to the two batteries and the inverter. And two system main relays that respectively cut off the two batteries, a smoothing capacitor attached to the inverter, and a capacitor attached to the battery side of the boost capacitor, and connection to one of the two batteries When switching from one to the other, both system main relays are turned off, and the upper arm of the boost converter is turned off to switch the lower arm, discharging the capacitor charge to the inverter side, and then connecting Turn on the battery system main relay It has been proposed (e.g., see Patent Document 1).

  In addition, a battery, an inverter as a driving circuit for the motor for traveling, a boost converter that boosts DC power from the battery and supplies the boosted power to the inverter, a high-voltage capacitor attached to the inverter, and a high-voltage capacitor in parallel And a connected discharge resistor, and when an abnormality occurs in the signal from the voltage sensor on the high voltage side, the boost converter is stopped and the high voltage side voltage is linearly reduced to the low voltage. (For example, refer to Patent Document 2).

JP 2010-004668 A JP 2009-261196 A

  When the battery is urgently cut off as an emergency response, it is necessary to discharge the electric charge stored in the capacitor from a request that the devices connected to the high voltage side and the low voltage side of the boost converter do not cause unexpected driving. In this case, in the former apparatus, in order to discharge the electric charge of the low-voltage side capacitor to the inverter side, the high-voltage side voltage needs to be equal to or lower than the low-voltage side voltage. Therefore, as in the latter device described above, the high-voltage side voltage is reduced to the low-voltage side voltage, and then the electric charge of the low-voltage side capacitor is discharged to the high-voltage side together with the discharge of the high-voltage side capacitor. In the latter device, since the discharge resistor is provided, the charge of the high-voltage side capacitor is consumed as heat by the discharge resistor, but in the device not provided with the discharge resistor, it is consumed as heat by the inverter switching loss or the motor loss. It is also possible. For example, by switching the upper arm while the lower arm of the switching element provided in the inverter is turned on, the charge of the capacitor on the high voltage side is consumed by the inverter and the charge of the capacitor on the high voltage side is discharged When the side voltage reaches the low side voltage equivalent, the lower arm is switched with the upper arm of the boost converter turned off to discharge the charge on the low side capacitor to the inverter side, and the inverter together with the charge on the high side capacitor It is conceivable to consume. Further, as a method of discharging the charge of the capacitor on the low voltage side to the inverter side, it can also be performed by turning on the upper arm with the lower arm of the boost converter turned off.

  As mentioned above, when the battery is urgently cut off, the inverter consumes the electric power from the discharge from the high-voltage side capacitor, and the charge on the low-voltage side capacitor when the high-voltage side voltage becomes equivalent to the low-voltage side voltage. If the inverter consumes both the electric power from the discharge from the high-voltage side capacitor and the electric power from the low-voltage side capacitor after the high-voltage side voltage is equivalent to the low-side voltage, Since the discharge of the capacitor is started, it takes time to discharge all the charges of the high voltage side capacitor and the low voltage side capacitor. Further, since the inverter consumes both the electric power from the discharge from the high-voltage side capacitor and the electric power from the low-voltage side capacitor, the inverter may overheat.

  The main purpose of the power supply device of the present invention is to quickly discharge the high-voltage side capacitor and the low-voltage side capacitor and to suppress overheating of the inverter.

  The power supply apparatus of the present invention employs the following means in order to achieve the main object described above.

The power supply device of the present invention is
A battery, an inverter having a plurality of switching elements, converting DC power to AC power and supplying the three-phase AC motor, and boosting DC power of a low-voltage power line to which the battery is connected to connect the inverter A converter for supplying a high voltage side power line to be operated, wherein two switching elements having an upper arm and a lower arm arranged in series between the high voltage side power line, an intermediate point between the two switching elements, and the low voltage side power line A step-up converter having a reactor attached between the positive-side line, a high-voltage side capacitor attached to the high-voltage side power line, and a system attached to the low-voltage side power line to shut off the battery Main relay and the boost converter side from the system main relay of the low-voltage power line And the low-voltage side capacitor mounted, a power supply device comprising a,
A first discharge control for consuming electric power from the discharge from the high-voltage side capacitor by the inverter and / or the three-phase AC motor by switching a switching element of the inverter at the time of emergency shutoff of the battery by the system main relay; The emergency shut-off control that independently executes the second discharge control in which the boost converter consumes the electric power generated by the discharge from the low-voltage side capacitor by turning off the upper arm of the boost converter and switching the lower arm. With means,
It is characterized by that.

  In the power supply device of the present invention, when the battery is urgently shut off by the system main relay, the first discharge control for consuming electric power from the discharge from the high-voltage side capacitor by the inverter or the three-phase AC motor by switching the switching element of the inverter. The second discharge control in which the boost converter consumes the electric power generated by the discharge from the low-voltage side capacitor is performed independently by turning off the upper arm of the boost converter and switching the lower arm. Here, in the first discharge control, the lower arm of each phase of the inverter is turned on and the upper arm of each phase of the inverter is switched, so that the high voltage side capacitor, the upper arm of the inverter, the lower arm of the inverter By forming a closed circuit via the arm, consuming electric power from the discharge from the high-voltage side capacitor due to loss in the switching element of the inverter, and controlling the inverter so that only the d-axis current flows through the three-phase AC motor, A closed circuit is formed via the high-voltage side capacitor, inverter, and three-phase AC motor, and power from the discharge from the high-voltage capacitor is consumed due to the loss of the three-phase AC motor. In the second discharge control, the lower arm is switched with the upper arm of the boost converter turned off, thereby forming a closed circuit via the low voltage side capacitor, the reactor of the boost converter, and the lower arm of the boost converter. The power from the discharge from the low voltage side capacitor is consumed due to the loss of the reactor and lower arm. As described above, the power consumption due to the discharge from the high-voltage side capacitor by the first discharge control and the power consumption by the discharge from the low-voltage side capacitor by the second discharge control are performed by forming different closed circuits. The discharge control and the second discharge control can be executed independently. “Independently” means “individually” or “one does not depend on the other”. If the relationship between the first discharge control and the second discharge control is used, the first discharge control is executed. This means that the execution of the second discharge control can be performed individually without one subordinate to the other. Therefore, in the power supply device of the present invention, the high-voltage side capacitor and the low-voltage side capacitor are compared with those in which the discharge of the low-voltage side capacitor is started when the voltage of the high-voltage side power line reaches the voltage equivalent to the low-voltage side power line. The side capacitor can be discharged quickly. In addition, in the second discharge control, the electric power from the low-voltage side capacitor is consumed by the boost converter, so that the electric power from the high-voltage side capacitor and the electric power from the low-voltage side capacitor are both consumed by the inverter. The overheating of the inverter can be suppressed.

  In such a power supply apparatus of the present invention, the emergency shut-off control means executes the first discharge control after the battery is shut off by the system main relay and after the three-phase AC motor is substantially stopped. The second discharge control may be a unit that is executed immediately after the battery is urgently cut off by the system main relay.

It is a block diagram which shows the outline of a structure of the power supply device 20 as one Example of this invention. 3 is a flowchart showing an example of an emergency shut-off high-pressure side control routine executed by an electronic control unit 50. 3 is a flowchart showing an example of an emergency shut-off low-pressure side control routine executed by an electronic control unit 50. It is explanatory drawing which shows an example of a mode that an electric current flows when the electric charge stored in the high voltage | pressure side capacitor | condenser 48 is discharged. 6 is an explanatory diagram showing an example of a state in which a current flows when electric charge stored in a low-voltage side capacitor 46 is discharged. FIG. The rotation speed Nm of the motor 32 at the time of emergency shutoff and the gate voltage of the inverter 34, the high voltage VH, etc., and the low voltage capacitor 46 when discharging the electric charge stored in the high voltage capacitor 48 in the embodiment and the comparative example. It is explanatory drawing which shows an example of time changes, such as the gate voltage of the boost converter 40, the low voltage | pressure side voltage VL, when discharging the stored electric charge. It is explanatory drawing which shows an example of a mode that an electric current flows when the electric charge stored in the low voltage | pressure side capacitor | condenser 46 and the high voltage | pressure side capacitor | condenser 48 in the comparative example is discharged.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of a configuration of a power supply device 20 as an embodiment of the present invention. As shown in the figure, the power supply device 20 of the embodiment is mounted on a vehicle together with a three-phase AC motor 32 configured as, for example, a synchronous generator motor and outputs motive power for traveling of the vehicle, and an inverter 34 for driving the motor 32. For example, a battery 36 configured as a lithium ion secondary battery, a power line (hereinafter referred to as a high voltage side power line) 44 to which the inverter 34 is connected, and a power line (hereinafter referred to as a low voltage side power line) to which the battery 36 is connected. The voltage VH of the high-voltage side power line 44 is adjusted within the range of the voltage VL of the low-voltage side power line 42 and not more than the maximum allowable voltage VHmax, and the high-voltage side power line 44 and the low-voltage side power line 42. And the low voltage side power line 4 for cutting off the battery 36. A system main relay (SMR) 43 attached to the low voltage side power line 42, a low voltage side capacitor 46 attached between the system main relay 43 and the boost converter 40 of the low voltage side power line 42 and smoothing the low voltage side voltage, and a high voltage side power. A high-voltage side capacitor 48 that is attached to the line 44 and smoothes the voltage on the high-voltage side, and an electronic control unit 50 that controls the entire power supply device 20 and drives and controls the motor 32 are provided.

  The inverter 34 includes transistors T11 to T16 as six switching elements, and six diodes D11 to D16 connected in parallel to the transistors T11 to T16 in the reverse direction. Two transistors T11 to T16 are arranged in pairs so as to be on the source side and the sink side with respect to the positive electrode bus and the negative electrode bus of the high voltage side power line 44, and are connected to each connection point of the paired transistors. Each of the three-phase coils (U-phase, V-phase, W-phase) of the motor 32 is connected. Therefore, by controlling the ratio of the on-time of the transistors T11 to T16 while the voltage is applied to the inverter 34, a rotating magnetic field can be formed in the three-phase coil, and the motor 32 can be driven to rotate.

  The step-up converter 40 is configured as a step-up converter including two transistors T31 and T32, two diodes D31 and D32 connected in parallel in the reverse direction to the transistors T31 and T32, and a reactor L. The two transistors T31 and T32 are connected to the positive electrode bus of the high voltage side power line 44 and the negative electrode bus of the high voltage side power line 44 and the low voltage side power line 42, respectively, and the reactor L is connected to the connection point. . The positive terminal and the negative terminal of the battery 36 are connected to the reactor L and the negative buses of the high voltage side power line 44 and the low voltage side power line 42, respectively. Therefore, by turning on / off the transistors T31 and T32, the power of the low-voltage side power line 42 is boosted and supplied to the high-voltage side power line 44, or the power of the high-voltage side power line 44 is stepped down. Or can be supplied.

  As shown in FIG. 2, the system main relay 43 includes a positive side relay 43a attached to the positive side line of the low side power line 42, and a negative side relay 43b attached to the negative side line of the low voltage side power line 42. It is comprised by.

  The electronic control unit 50 is configured as a microprocessor centered on a CPU (not shown). Although not shown, in addition to the CPU, a ROM that stores a processing program, a RAM that temporarily stores data, and an input (not shown). An output port. The electronic control unit 50 is attached to the rotational position of the rotor of the motor 32 from the rotational position detection sensor 32 a that detects the rotational position of the rotor of the motor 32, or to a connection line (power line) between the motor 32 and the inverter 34. Phase currents Iu and Iv from current sensors 33u and 33v, voltage Vb between terminals from a voltage sensor (not shown) installed between terminals of battery 36, not shown attached to a power line connected to an output terminal of battery 36 Charge / discharge current from the current sensor, battery temperature from a temperature sensor (not shown) attached to the battery 36, voltage of the low voltage side capacitor 46 from the voltage sensor 46a attached between terminals of the low voltage side capacitor 46 (low voltage side power line) 42) voltage sensor 48 mounted between terminals of VL and high-voltage side capacitor 48 The voltage of the high-voltage side capacitor 48 from VH (voltage of the high-voltage side power line 44) VH, and other signals necessary for vehicle drive control, such as an ignition signal from an ignition switch and a sensor that detects the operation position of the shift lever A signal, a signal from a sensor that detects the amount of depression of the accelerator pedal, a signal from a sensor that detects the amount of depression of the brake pedal, a vehicle speed V from the vehicle speed sensor, and the like are input via the input port. From the electronic control unit 50, a switching control signal to the transistors T11 to T16 of the inverter 34, a switching control signal to the transistors T31 and T32 of the boost converter 40, a drive signal to the system main relay 43, and the like are output via the output port. Has been. The electronic control unit 50 also calculates the rotational speed Nm of the motor 32 based on the rotational position of the rotor of the motor 32 from the rotational position detection sensor 32a.

  Next, the charge stored in the low-voltage side capacitor 46 and the high-voltage side capacitor 48 when the battery 36 is urgently shut off by the system main relay 43 due to the operation of the power supply device 20 of the embodiment thus configured, in particular, a collision or the like is discharged. The operation at that time will be described. FIG. 2 is a flowchart showing an example of an emergency cutoff high-pressure side control routine executed by the electronic control unit 50 of the embodiment in order to discharge the charge stored in the high-voltage side capacitor 48 at the time of emergency shutdown. FIG. 6 is a flowchart showing an example of an emergency cutoff low-pressure side control routine executed by the electronic control unit 50 of the embodiment in order to discharge the electric charge stored in the low-voltage side capacitor 46 at the time of emergency cutoff. The routine of FIG. 2 and the routine of FIG. 3 are executed by the electronic control unit 50 simultaneously in parallel when the battery 36 is urgently shut off by the system main relay 43. Hereinafter, it demonstrates in order.

  When the emergency cut-off high-pressure side control routine is executed, the electronic control unit 50 first turns on the transistors T14, T15, and T16 of the lower arm of each phase of the inverter 34 (step S100), and the rotational speed Nm of the motor 32. And waits for the input rotation speed Nm to become 0 (steps S110 and S120). When the rotational speed Nm of the motor 32 becomes 0, switching of the transistors T11, T12, T13 of the upper arm of the inverter 34 is started (step S130), and the voltage VH of the high-voltage side capacitor 48 from the voltage sensor 48a is input. Waiting for the voltage VH to reach the value 0 (steps S140 and S150), when the voltage VH of the high-voltage side capacitor 48 reaches the value 0, all the transistors T11 to T16 of the upper arm and the lower arm of the inverter 34 are turned off. (Step S160), this routine is finished.

  FIG. 4 shows how current flows when the transistors T11, T12, and T13 of the upper arm of the inverter 34 are switched with the transistors T14, T15, and T16 of the lower arm of each phase of the inverter 34 turned on. As shown in the figure, the charge stored in the high-voltage side capacitor 48 is switched to the closed circuit via the high-voltage side capacitor 48, the transistors T11, T14, the high-voltage side capacitor 48, the transistor by the switching of the transistors T11, T12, T13 of the upper arm. The closed circuit passing through T12 and T15, the high-voltage side capacitor 48, and the closed circuit passing through transistors T13 and T16 flow to the closed circuit. , T16 is consumed as a loss.

  When the emergency cutoff low-pressure side control routine is executed, the electronic control unit 50 turns off the transistor T31 in the upper arm of the boost converter 40 (step S200), and starts switching the transistor T32 in the lower arm of the boost converter 40. (Step S210) Inputting the voltage VL of the low-voltage side capacitor 46 from the voltage sensor 46a and waiting for the voltage VL to become zero (Steps S220 and S230), the voltage VL of the low-voltage side capacitor 46 becomes zero. When this happens, the transistor T32 in the lower arm of the boost converter 40 is turned off (step S240), and this routine ends.

  FIG. 5 shows a current flow when the transistor T32 in the lower arm of the boost converter 40 is switched with the transistor T31 in the upper arm of the boost converter 40 turned off. As shown in the figure, the electric charge stored in the low-voltage side capacitor 46 flows to the closed circuit via the low-voltage side capacitor 46, the reactor L, and the transistor T32 due to the switching of the transistor T32 in the lower arm. It is consumed as a loss in the transistor T32 in the closed circuit.

  FIG. 6 shows the rotation speed Nm of the motor 32 when the battery 36 is urgently shut off by the system main relay 43 and the inverter 34 when discharging the electric charge stored in the high-voltage side capacitor 48 in the embodiment and the comparative example. FIG. 6 is an explanatory diagram showing an example of temporal changes of the gate voltage and low voltage side voltage VL of the boost converter 40 when discharging the charge stored in the low voltage side capacitor 46 and the gate voltage and high voltage side voltage VH. As a comparative example, when the battery 36 is urgently shut off by the system main relay 43, the transistors T14, T15, and T16 of the lower arm of the inverter 34 are turned on after the rotation speed Nm of the motor 32 becomes zero. By switching the transistors T11, T12, and T13 of the upper arm in the state, the power due to the discharge of the charge of the high-voltage side capacitor 48 is consumed by the inverter 34, and the voltage VH of the high-voltage side capacitor 48 is equal to the voltage VL of the low-voltage side capacitor 46. When the transistor T11, T12, and T13 continue to be switched, the upper arm transistor T31 of the boost converter 40 is turned off and the lower arm transistor 32 is switched and stored in the low voltage side capacitor 46. Discharge the charge to the high voltage side, and this discharge Power by was assumed to be consumed by the inverter 34 with electric power by the discharge of the charge stored in the high-pressure side capacitor 48. FIG. 7 shows an example of a state in which current flows when discharging the electric charge stored in the low-voltage side capacitor 46 and the electric charge stored in the high-voltage side capacitor 48 in the comparative example. As shown in the figure, both the electric charge stored in the low-voltage side capacitor 46 and the electric charge stored in the high-voltage side capacitor 48 are consumed by the inverter 34 by the discharge.

  In the power supply device 20 of the embodiment, as shown in FIG. 6, the emergency shut-off high-pressure side control routine of FIG. 2 and the emergency shut-off low-pressure side control of FIG. 3 at time T 1 when the battery 36 is urgently shut off by the system main relay 43. And the lower arm transistors T14, T15, T16 of the inverter 34 are turned off on the high voltage side, and the lower arm transistors T31 of the boost converter 40 are turned off on the low voltage side. Switching of T32 is started. On the low voltage side, the switching of the lower arm transistor T32 causes the electric charge stored in the low voltage side capacitor 46 to flow to the closed circuit via the low voltage side capacitor 46, the reactor L, and the transistor T32, and the power is supplied to the reactor L and the transistor T32. Is consumed by the loss of. Then, at time T2 when the low-voltage side voltage VL reaches the value 0, on the low-voltage side, the transistor T32 in the lower arm of the boost converter 40 is turned off, and the discharge of the electric charge stored in the low-voltage side capacitor 46 is finished. On the high voltage side, switching of the transistors T11, T12, T13 of the upper arm of the inverter 34 is started at a time T3 when the rotational speed Nm of the motor 32 becomes 0, and the high voltage is increased by switching of the transistors T11, T12, T13 of the upper arm. The charge stored in the side capacitor 48 passes through the high voltage side capacitor 48, the closed circuit via the transistors T11 and T14, the high voltage side capacitor 48, the closed circuit via the transistors T12 and T15, the high voltage side capacitor 48, and the transistors T13 and T16. Each of the electric power flows through the closed circuit, and the power is consumed by the loss of the transistors T11 to T16. Then, at time T5 when the high-voltage side voltage VH reaches the value 0, the transistors T11 to T16 of the upper and lower arms of the inverter 34 are turned off, and the discharge of the charge stored in the high-voltage side capacitor 48 is finished.

  On the other hand, in the comparative example, at time T1 when the battery 36 is urgently cut off by the system main relay 43, the transistors T14, T15, and T16 of the lower arm of the inverter 34 are turned off on the high voltage side and the boost converter 40 is The transistors T31 and T32 of the arm are turned off, and the state waits for the rotational speed Nm of the motor 32 to become 0 in this state. Switching of the transistors T11, T12, and T13 of the upper arm of the inverter 34 is started at a time T3 when the rotation speed Nm of the motor MG2 is 0, and at a time T3 when the rotation speed Nm of the motor 32 is 0. By switching the upper arm transistors T11, T12, and T13, the electric power generated by the discharge of the charge stored in the high-voltage side capacitor 48 is consumed by the loss of the transistors T11 to T16. During the time T4 when the high-voltage side voltage VH is reduced and coincides with the low-voltage side voltage VL while the inverter 34 is consuming the electric power due to the discharge of the charge stored in the high-voltage side capacitor 48 by the switching of the high-voltage side inverter 34. When the transistor T31 which is the upper arm of the boost converter 40 is turned on, the charge stored in the low voltage side capacitor 46 is discharged to the high voltage side, and the charge stored in the low voltage side capacitor 46 and the charge stored in the high voltage side capacitor 48 are Are discharged to the inverter 34, and the electric power generated by the discharge is consumed by the inverter 34. Then, at time T6 when both of the low voltage side voltage VL and the high voltage side voltage VH reach the value 0, all of the transistors T11 to T16 of the inverter 34 and the transistors T31 and T32 of the boost converter 40 are turned off and stored in the low voltage side capacitor 46. The discharge of the accumulated charge and the charge stored in the high voltage side capacitor 48 is terminated.

  In the comparative example, the discharge of the charge stored in the low-voltage side capacitor 46 is started from time T4 when the high-voltage side voltage VH decreases and coincides with the low-voltage side voltage VL, and is stored in the low-voltage side capacitor 46 from this time T4. Since both the electric charge and the electric charge stored in the high-voltage side capacitor 48 are discharged to the inverter 34, the time for completing the discharge is delayed to the time T6 as compared with the time T5 of the embodiment. That is, the embodiment can discharge the charge stored in the low-voltage side capacitor 46 and the high-voltage side capacitor 48 more quickly than the comparative example. In the comparative example, all of the electric power generated by the discharge of the charges stored in the low-voltage side capacitor 46 and the high-voltage side capacitor 48 is consumed by the inverter 34. However, in the embodiment, the electric power stored in the low-voltage side capacitor 46 is discharged. Since the electric power is consumed by the boost converter 40 and the electric power generated by the discharge of the electric charge stored in the high-voltage side capacitor 48 is consumed by the inverter 34, the overheating of the transistors T11 to T16 of the inverter 34 is suppressed as compared with the comparative example. Can do.

  According to the power supply device 20 of the embodiment described above, when the battery 36 is urgently shut off by the system main relay 43, the emergency shut-off high-pressure side control routine of FIG. 2 and the emergency shut-off low-pressure side control routine of FIG. Simultaneously, the electric power generated by the discharge of the electric charge stored in the low-voltage side capacitor 46 is consumed by the boost converter 40, and the electric power generated by the electric charge stored in the high-voltage side capacitor 48 is consumed by the inverter 34. Comparative example in which the electric charge stored in the low-voltage side capacitor 46 and the high-voltage side capacitor 48 can be discharged, and all the electric power generated by the discharge of the electric charge stored in the low-voltage side capacitor 46 and the high-voltage side capacitor 48 is consumed by the inverter 34. As compared with the above, overheating of the transistors T11 to T16 of the inverter 34 can be suppressed.

  In the power supply device 20 of the embodiment, it is assumed that the power supply device 20 is mounted on the vehicle together with the three-phase AC motor 32 that outputs motive power for travel. It does not matter even if it is built in.

  In the power supply device 20 of the embodiment, the charges stored in the high-voltage side capacitor 48 are switched by switching the transistors T11, T12, T13 of the upper arm with the transistors T14, T15, T16 of the lower arm of the inverter 34 turned off. To the closed circuit via high voltage side capacitor 48, transistors T11, T14, the closed circuit via high voltage side capacitor 48, transistors T12, T15, and the closed circuit via high voltage side capacitor 48, transistors T13, T16, respectively. The electric power is consumed by the loss of the transistors T11 to T16. However, by switching the transistors T11 to T16 of the inverter 34 so that only the d-axis current flows to the motor 32, the electric charge stored in the high-voltage side capacitor 48 is changed. , And inverter 34 It flowed over data 32 may be the power as consumed by the loss of the inverter 34 and motor 32.

  In the power supply device 20 of the embodiment, when the battery 36 is urgently shut off by the system main relay 43, the electronic control unit 50 simultaneously performs the emergency shut-off high-pressure side control routine of FIG. 2 and the emergency shut-off low-pressure side control routine of FIG. Although executed in parallel, the execution of the emergency shutoff low pressure side control routine of FIG. 3 is started after a certain amount of time has elapsed after the execution of the emergency shutoff high pressure side control routine of FIG. 2 is started. It is good.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the battery 36 corresponds to a “battery”, the motor 32 corresponds to a “three-phase AC motor”, the inverter 34 corresponds to an “inverter”, and is a booster configured by transistors T31 and T32 and a reactor L. The converter 40 corresponds to a “boost converter”, the high voltage side capacitor 48 corresponds to a “high voltage side capacitor”, the system main relay 43 corresponds to a “system main relay”, and the low voltage side capacitor 46 corresponds to a “low voltage side capacitor”. Equivalent to. 2 corresponds to “first discharge control”, and control according to the emergency cutoff low pressure side control routine of FIG. 3 corresponds to “second discharge control”. The electronic control unit 50 that executes the emergency cutoff high-pressure side control routine and the emergency cutoff low-pressure side control routine of FIG. 3 corresponds to the “emergency cutoff control means”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the power supply device manufacturing industry.

  20 power supply device, 32 motor, 32a rotational position detection sensor, 33u, 33v current sensor, 34 inverter, 36 battery, 40 boost converter, 42 low voltage side power line, 43 system main relay, 43a positive side relay, 43b negative side relay, 44 high voltage side power line, 46 low voltage side capacitor, 46a voltage sensor, 48 high voltage side capacitor, 48a voltage sensor, 50 electronic control unit, D11 to D16, D31, D32 diode, L reactor, T11 to T16, T31, T32 transistor.

Claims (2)

A battery, an inverter having a plurality of switching elements, converting DC power to AC power and supplying the three-phase AC motor, and boosting DC power of a low-voltage power line to which the battery is connected to connect the inverter A converter for supplying a high voltage side power line to be operated, wherein two switching elements having an upper arm and a lower arm arranged in series between the high voltage side power line, an intermediate point between the two switching elements, and the low voltage side power line A step-up converter having a reactor attached between the positive-side line, a high-voltage side capacitor attached to the high-voltage side power line, and a system attached to the low-voltage side power line to shut off the battery Main relay and the boost converter side from the system main relay of the low-voltage power line And the low-voltage side capacitor mounted, a power supply device comprising a,
A first discharge control for consuming electric power from the discharge from the high-voltage side capacitor by the inverter and / or the three-phase AC motor by switching a switching element of the inverter at the time of emergency shutoff of the battery by the system main relay; The emergency shut-off control that independently executes the second discharge control in which the boost converter consumes the electric power generated by the discharge from the low-voltage side capacitor by turning off the upper arm of the boost converter and switching the lower arm. With means,
A power supply device characterized by that. The power supply device according to claim 1,
The emergency shut-off control means executes the first discharge control after emergency shutoff of the battery by the system main relay and after the three-phase AC motor is substantially stopped, and the second discharge control. Means for executing immediately after the emergency shutdown of the battery by the system main relay,
Power supply.

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