JP2021090239A - Drive system - Google Patents

Abstract

To provide a drive system capable of suppressing damage to a load even in the case where abnormality occurs in an inverter or an opening/closing part in the middle of rotating a rotor of a rotary electric machine at a high rotation speed.SOLUTION: A drive system comprises: first and second batteries 11 and 12; an inverter 20 connected to the first and second batteries 11 and 12 via a negative electrode side power supply path L2; a rotary electric machine 30 which is connected to the inverter 20 and performs input/output of power with the first and second batteries 11 and 12 via the inverter 20; a second SMR 14B provided in the negative electrode side power supply path L2; and a high voltage auxiliary machine 40 which is connected to the first and second batteries 11 and 12 via a midpoint between the second SMR 14B and the first and second batteries 11 and 12 in the negative electrode side power supply path L2 and operated by power from the first and second batteries 11 and 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drive system.

Conventionally, a drive system including a secondary battery, an inverter connected to the secondary battery, and a three-phase AC motor connected to the inverter and input / output power to / from the secondary battery via the inverter has been used. It is known (for example, Patent Document 1). In this drive system, when the rotor of a three-phase AC motor is rotating at a high rotational speed and an abnormality occurs in the inverter and the switching elements that make up the inverter are cut off and turned off, the inverter is turned on. Control to a phase short circuit state. As a result, even if the counter electromotive voltage generated by the rotation of the rotor of the three-phase AC electric motor rises beyond the voltage of the secondary battery, it is possible to suppress the counter electromotive voltage from being applied to the secondary battery, and the secondary battery can be prevented from being applied. Damage to the battery can be suppressed.

Japanese Unexamined Patent Publication No. 2011-172343

In the drive system, an opening / closing part may be provided in the electric path connecting the secondary battery and the inverter. In this drive system, when the inverter is shut off and turned off while the rotor of the three-phase AC motor is rotating at a high rotation speed, the opening / closing part is turned off to rotate the three-phase AC motor. It is possible to prevent the generated countercurrent voltage from being applied to the secondary battery. In addition, even if an off failure occurs in the opening / closing part while the three-phase AC motor is rotating at a high rotation speed, the counter electromotive voltage generated by the rotation of the three-phase AC motor is applied to the secondary battery. Can be suppressed.

In the drive system, a load operated by the electric power from the secondary battery may be connected to the secondary battery. In this case, if the load is connected to the inverter side of the opening / closing part, an abnormality occurs in the inverter or the opening / closing part while the rotor of the three-phase AC motor is rotating at a high rotation speed, and the opening / closing part is turned off. Even if this is the case, it is not possible to suppress the application of the countercurrent voltage generated by the rotation of the rotor of the three-phase AC motor to the load, and it is not possible to suppress the damage to the load.

The present invention has been made in view of the above circumstances, and an object of the present invention is to damage the load even if an abnormality occurs in the inverter or the opening / closing part while the rotor of the rotary electric machine is rotating at a high rotation speed. The purpose is to provide a drive system that can suppress the above.

The first means for solving the above-mentioned problems is between a power storage device, an inverter connected to the power storage device via an electric path, and the power storage device connected to the inverter and via the inverter. It is connected to the power storage device via a rotary electric machine that inputs and receives electric power, an opening / closing unit provided in the electric path, and an intermediate point between the opening / closing part and the power storage device in the electric path. It includes a load operated by electric power from the power storage device.

In this configuration, an inverter is connected to the power storage device via an electric path, and an opening / closing portion is provided in this electric path. Further, a load is connected to the power storage device, and this load is connected to the power storage device via an intermediate point between the opening / closing portion and the power storage device in the electric path. That is, in the electric path connecting the power storage device and the inverter, the load is connected to the power storage device side rather than the opening / closing part, and the opening / closing part is arranged between the inverter and the load. Therefore, if an abnormality occurs in the inverter or the opening / closing part while the rotor of the rotary electric machine connected to the inverter is rotating at a high rotation speed and the opening / closing part is turned off, the connection between the inverter and the load is cut off. .. As a result, it is possible to suppress the back electromotive voltage generated in the inverter due to the rotation of the rotor of the rotary electric machine from being applied to the load, and it is possible to suppress damage to the load.

The second means is that the electric path has a first positive electrode side line connecting the positive electrode side terminal of the power storage device and the positive electrode side terminal of the first charger, and the negative electrode side terminal of the power storage device and the first charging. A first negative electrode side line connecting the negative electrode side terminal of the device, a second positive electrode side line connecting the positive electrode side terminal of the power storage device and the positive electrode side terminal of the second charger, and a negative electrode side terminal of the power storage device. And a second negative electrode side line connecting the second negative electrode side terminal of the second charger, and the inverter is connected between the first positive electrode side line and the first negative electrode side line. The opening / closing portion is a first opening / closing portion, and is provided on a first connection line which is either one of the first positive electrode side line and the first negative electrode side line, and the load is the second. The second connection line on the same electrode side as the first connection line among the positive electrode side line and the second negative electrode side line, and the first connection line among the first positive electrode side line and the first negative electrode side line are It is connected to different lines, and the second connection line is connected to the first connection line at the intermediate point between the opening / closing portion and the power storage device in the first connection line. The second connection line includes a second opening / closing unit provided on the power storage device side of the load and a control unit for turning on / off the second opening / closing unit. The control unit is of the rotary electric machine. The second opening / closing part is turned on during driving and charging of the power storage device by the second charger, and the second opening / closing part is turned off during charging of the power storage device by the first charger.

The power storage device may be configured to be connectable to two types of chargers so that charging by two different types of chargers, such as a DC charger and an AC charger, is possible. In this configuration, the first positive electrode side line and the first negative electrode side line connecting the first charger and the power storage device, and the second positive electrode side line and the second negative electrode side line connecting the second charger and the power storage device. The inverter, the first opening / closing unit as an opening / closing unit, and the load are connected to the power storage device via the above. Therefore, the configuration of the drive system can be simplified as compared with the case where the configuration of the inverter or the like is connected to the power storage device via the lines other than the first positive electrode side line and the second positive electrode side line and the negative electrode side line.

In the above configuration, the first opening / closing portion is provided on the first connection line which is one of the first positive electrode side line and the first negative electrode side line, and is provided on the second positive electrode side line and the second negative electrode side line. Among them, in the second connection line on the same electrode side as the first connection line, a second opening / closing portion is provided on the power storage device side with respect to the load. Then, the second opening / closing unit is controlled to be turned on while the rotary electric machine is being driven and the power storage device is being charged by the second charger. By turning on the second opening / closing unit while the rotary electric machine is being driven, the load can be driven while the rotary electric machine is being driven. Further, the second opening / closing unit is controlled to be turned off during charging of the power storage device by the first charger. As a result, it is possible to prevent the load life from being shortened due to the charging voltage generated by the first charger being applied to the load while the power storage device is being charged by the first charger.

The third means includes a third opening / closing unit provided on the second charger side of the load on the second connection line, and the control unit is charging the power storage device by the second charger. The third opening / closing part is turned on, and the third opening / closing part is turned off while the rotary electric machine is being driven.

In this configuration, a third opening / closing part is provided on the second charger side of the load in the second connection line, and this third opening / closing part is turned on and rotates during charging of the power storage device by the second charger. It is controlled to turn off while the electric machine is driving. By turning off the third opening / closing unit while the rotary electric machine is being driven, it is possible to suppress the noise generated in the second charger while the rotary electric machine is being driven from propagating to the load via the second charging path.

The fourth means is that the rotary electric machine has a multi-phase winding, and the inverter has a first inverter connected to a part of the multi-phase windings and the remaining windings. The electric path includes a second inverter connected to at least a part of the windings of the wire, and the electric path is a first positive electrode side connecting a positive electrode side terminal of the power storage device and a positive electrode side terminal of the first inverter. The line, the first negative electrode side line connecting the negative electrode side terminal of the power storage device and the negative electrode side terminal of the first inverter, and the positive electrode side terminal of the power storage device and the positive electrode side terminal of the second inverter are connected. It has a second positive electrode side line, a second negative electrode side line connecting the negative electrode side terminal of the power storage device and the negative electrode side terminal of the second inverter, and the opening / closing portion includes the first positive electrode side line and the first positive electrode side line. The first opening / closing portion provided in the first connection line, which is one of the first negative electrode side lines, and the poles of the second positive electrode side line and the second negative electrode side line, which are different from the first connection line. The second opening / closing portion provided on the second connection line on the side, and the second positive electrode side line and the second negative electrode side line different from the second connection line are the first connection. Of the lines, the first connection line is connected to the first connection line at the first intermediate point between the first opening / closing portion and the power storage device, and the first of the first positive electrode side line and the first negative electrode side line. A line different from the 1 connection line is connected to the second connection line at the second intermediate point between the second opening / closing portion and the power storage device in the second connection line, and the load is a load. The first positive electrode side line and the first negative electrode side line different from the first connection line, and the second positive electrode side line and the second negative electrode side line different from the second connection line. Is connected to.

As the inverter, a first inverter connected to a part of the multi-phase windings in the rotary electric machine and a second inverter connected to at least a part of the remaining windings are used. May include. The first inverter and the second inverter are controlled separately, and each inverter is connected to the power storage device via separate positive electrode side lines and negative electrode side lines. Specifically, the first inverter is connected to the power storage device via the first positive electrode side line and the first negative electrode side line, and the second inverter passes through the second positive electrode side line and the second negative electrode side line. Is connected to the power storage device.

In this configuration, in the first connection line which is one of the first positive electrode side line and the first negative electrode side line, the load is connected to the power storage device side rather than the first opening / closing part, and the load is connected to the first inverter. The first opening / closing part is arranged between the and. Further, in the second connection line on the pole side of the second positive electrode side line and the second negative electrode side line, which is different from the first connection line, the load is connected to the power storage device side rather than the second opening / closing part, and the second inverter. A second opening / closing part is arranged between the load and the load. Therefore, if an abnormality occurs in the first inverter or the first opening / closing part while the rotor of the rotary electric machine is rotating at a high rotation speed and the first opening / closing part is turned off, the connection between the first inverter and the load is established. It is blocked. Further, if an abnormality occurs in the second inverter or the second opening / closing part while the rotor of the rotary electric machine is rotating at a high rotation speed and the second opening / closing part is turned off, the connection between the second inverter and the load is established. It is blocked. As a result, it is possible to suppress the back electromotive voltage generated in the first and second inverters from being applied to the load due to the rotation of the rotor of the rotary electric machine, and it is possible to suppress damage to the load.

Further, in the above configuration, the above connection is realized by using the first and second positive electrode side lines and the first and second negative electrode side lines. That is, using only the first and second positive electrode side lines and the first and second negative electrode side lines, the first opening / closing portion is arranged between the first inverter and the load, and between the second inverter and the load. A second opening / closing part is arranged. Therefore, the configuration of the drive system can be simplified as compared with the case where the above connection is realized via a line other than these lines.

Fifth means includes a power storage device, a charger connected to the power storage device via an electric path, an inverter connected to the power storage device via a first intermediate point in the electric path, and the inverter. A rotary electric machine that is connected and inputs and outputs electric power to and from the power storage device via the inverter, and is connected to the power storage device via a second intermediate point in the electric path, and is connected to the power storage device by the power from the power storage device. It includes an operating load, an opening / closing unit provided between the first intermediate point and the second intermediate point of the electric path and the charger, and a control unit that controls the opening / closing unit. The charger contains a first capacitance component connected in parallel to the power storage device, the inverter contains a second capacitance component connected in parallel to the power storage device, and the control unit is such that the rotary electric machine rotates at high speed. When it is in the state, the opening / closing part is turned on.

In this configuration, a charger is connected to the power storage device via an electric path. Further, an inverter and a load are connected to the power storage device, and these inverters and the load are connected to the power storage device via the first intermediate point and the second intermediate point between the power storage device and the charger in the electric path. Has been done. In the above configuration, an opening / closing portion is provided between the first intermediate point and the second intermediate point in the electric path and the charger, and this opening / closing portion is turned on when the rotor of the rotary electric machine is in a high rotation state. Is controlled. As a result, when the rotor of the rotary electric machine is rotating at a high rotation speed, the charger and the inverter are connected in parallel. Since the charger and the inverter each include a capacitance component connected in parallel to the power storage device, the combined capacity of the drive system is increased by connecting the charger and the inverter in parallel. Therefore, if an abnormality occurs in the inverter while the rotor of the rotary electric machine is rotating at a high rotation speed, the increase in the combined capacity can suppress the increase in the counter electromotive voltage generated by the rotation of the rotor of the rotary electric machine. , Load damage can be suppressed.

In the sixth means, the first capacitance component is a capacitance component having a lower resistance to the ripple current generated by the rotary electric machine than the second capacitance component.

In this configuration, since the first capacitance component is configured by using a relatively inexpensive capacitance component, which has lower resistance to ripple current than the second capacitance component, an increase in product cost can be suppressed. On the other hand, if the resistance of the first capacitance component to the ripple current is low, there is a concern that the charger may be damaged when the opening / closing portion is turned on. In the above configuration, since the switching portion is turned on when the rotary electric machine is in a high rotation state and the generation of the ripple current is suppressed, the counter electromotive voltage is increased by using the first capacitance component having low resistance to the ripple current. The rise can be suppressed. That is, an increase in product cost and an increase in counter electromotive voltage can be suitably suppressed.

The overall block diagram of the drive system of 1st Embodiment. The whole block diagram of the drive system of the modification of 1st Embodiment. The overall block diagram of the drive system of 2nd Embodiment. The whole block diagram of the drive system of the modification of 2nd Embodiment. The overall block diagram of the drive system of 3rd Embodiment. The whole block diagram of the drive system of the modification of 3rd Embodiment. The overall block diagram of the drive system of 4th Embodiment. The overall block diagram of the drive system of the modification of 4th Embodiment. The overall block diagram of the drive system of 5th Embodiment. A flowchart showing the procedure of connection processing. A time chart showing an example of connection processing. FIG. 5 is an overall configuration diagram of a drive system of a modified example of the fifth embodiment.

(First Embodiment)
Hereinafter, a first embodiment in which the drive system according to the present invention is embodied as an in-vehicle drive system 100 will be described with reference to the drawings.

As shown in FIG. 1, the drive system 100 according to the present embodiment includes a power supply unit 10, an inverter 20, a rotary electric machine 30, a high voltage auxiliary machine 40, an in-vehicle charger 50 as a second charger, and the like. It includes a control unit 90.

The rotary electric machine 30 has functions of power running drive and regenerative drive, and is specifically an MG (Motor Generator). The rotary electric machine 30 has a star-shaped three-phase winding. The rotor of the rotary electric machine 30 is connected to the drive wheels of the vehicle so as to be able to transmit power. The rotary electric machine 30 is connected to the first and second batteries 11 and 12 via an inverter 20, and inputs and outputs electric power to and from the first and second batteries 11 and 12.

The power supply unit 10 includes first and second batteries 11 and 12 as power storage devices. The first and second batteries 11 and 12 are rechargeable and dischargeable storage batteries, for example, an assembled battery in which a plurality of lithium ion storage batteries 13 are connected in series. The first and second batteries 11 and 12 may be other types of storage batteries.

The first and second batteries 11 and 12 are connected in parallel to each other, and the positive electrode side terminal of the inverter 20 is connected to the positive electrode side power supply path L1 connected to the positive electrode side terminals of the first and second batteries 11 and 12. Has been done. Similarly, the negative electrode side terminal of the inverter 20 is connected to the negative electrode side power supply path L2 connected to the negative electrode side terminals of the first and second batteries 11 and 12. In the present embodiment, the positive electrode side power supply path L1 corresponds to the "first positive electrode side line", and the negative electrode side power supply path L2 corresponds to the "electrical path, the first negative electrode side line, the first connection line".

The positive electrode and negative electrode side power supply paths L1 and L2 are connected to the first and second external charging terminals TB1 and TB2, and are outside the vehicle as the first charger via the first and second external charging terminals TB1 and TB2. It is configured to be connectable to the charger 200. The external charger 200 is, for example, a DC quick charger, and the first and second batteries 11 and 12 have the positive electrode side terminal of the external charger 200 connected to the first external charging terminal TB1 and the second external charging terminal TB2. When the negative electrode side terminal of the external charger 200 is connected to the external charger 200, the battery is charged by the high-pressure DC power input from the external charger 200.

The first and second charging switches 61 and 62 are provided between the inverter 20 in the positive and negative electrode side power supply paths L1 and L2 and the first and second external charging terminals TB1 and TB2. The first and second charging switches 61 and 62 are turned on when charging the first and second batteries 11 and 12 using the external charger 200, and turned off in other cases. By turning off the first and second charging switches 61 and 62, it is possible to suppress the propagation of noise to the inverter 20 via the first and second external charging terminals TB1 and TB2.

The power supply unit 10 includes first to third SMRs (system main relays) 14A, 14B, and 15. The first SMR14A is provided in the positive electrode side power supply path L1 between the first and second batteries 11 and 12 and the inverter 20, and the second and third SMR14B and 15 are the first and second batteries 11 and 12. It is provided in the negative electrode side power supply path L2 between the inverter 20 and the negative electrode side. Therefore, the first to third SMRs 14A, 14B, and 15 are configured to be able to switch between the energized state and the energized cutoff state of the inverter 20. In this embodiment, the second SMR14B corresponds to the "opening / closing portion, first opening / closing portion".

The second and third SMRs 14B and 15 are connected in parallel in the negative electrode side power supply path L2. The third SMR 15 is a relay switch that precharges a capacitance component (for example, a smoothing capacitor) contained in the inverter 20 from the first and second batteries 11 and 12 when the rotary electric machine 30 is started. A resistance element 16 that suppresses an inrush current during precharging is connected in series to the third SMR 15.

The second SMR 14B is a relay switch that supplies power to the rotary electric machine 30 after precharging. The second SMR 14B is connected in parallel to the series connector of the third SMR 15 and the resistance element 16.

The inverter 20 is configured by connecting a series connector of an upper arm switch, which is a switching element on the high potential side, and a lower arm switch, which is a switching element on the low potential side, in parallel. In each phase, one end of the winding of the corresponding phase of the rotary electric machine 30 is connected to the connection point between the upper arm switch and the lower arm switch.

Further, the inverter 20 is connected to the first and second batteries 11 and 12 via the first to third SMRs 14A, 14B and 15. When the inverter 20 is driven by force, the DC power input from the first and second batteries 11 and 12 is converted into AC power, and the rotary electric machine 30 is rotationally driven by this AC power. When the inverter 20 is regenerated, the inverter 20 converts the AC power input from the rotary electric machine 30 into DC power, and charges the first and second batteries 11 and 12 with this DC power.

The in-vehicle charger 50 is, for example, an AC charger, and can be connected to an AC power supply via the third and fourth external charging terminals TB3 and TB4. The AC power supply is, for example, a commercial power supply. The positive electrode side terminal of the vehicle-mounted charger 50 is connected to the positive electrode side terminals of the first and second batteries 11 and 12 via the positive electrode side charging path L3, and the negative electrode side terminal of the vehicle-mounted charger 50 is charged on the negative electrode side. It is connected to the negative electrode side terminals of the first and second batteries 11 and 12 via the path L4. Specifically, the positive electrode side charging path L3 is connected to the positive electrode side power supply path L1 at the first connection point P1 between the first and second batteries 11 and 12 and the first SMR 14A in the positive electrode side power supply path L1. Further, the negative electrode side charging path L4 is connected to the negative electrode side power supply path L2 at the second connection point P2 between the first and second batteries 11 and 12 and the second and third SMR14B and 15 in the negative electrode side power supply path L2. ing.

When the AC power supply is connected to the third and fourth external charging terminals TB3 and TB4, the in-vehicle charger 50 converts the AC power input from the AC power supply into DC power, and the first and second DC powers are used. Charge the batteries 11 and 12. In the present embodiment, the positive electrode side charging path L3 corresponds to the "second positive electrode side line", the negative electrode side charging path L4 corresponds to the "second negative electrode side line, the second connection line", and the second connection point. P2 corresponds to the "midpoint".

Third and fourth charging switches 63 and 64 are provided between the first and second connection points P1 and P2 in the positive electrode and negative electrode side charging paths L3 and L4 and the vehicle-mounted charger 50. The third and fourth charging switches 63 and 64 are turned on when the in-vehicle charger 50 is used to charge the first and second batteries 11 and 12, and are turned off in other cases. By turning off the third and fourth charging switches 63 and 64, it is possible to suppress the noise generated in the vehicle-mounted charger 50 from propagating to the inverter 20 via the paths L1 to L4.

The high-voltage auxiliary machine 40 is a load that is connected to the first and second batteries 11 and 12 and operates by DC power input from the first and second batteries 11 and 12. The high voltage auxiliary machine 40 has a constant voltage required load in which the voltage of DC power is required to be substantially constant or at least fluctuate within a predetermined range, and a general load other than the constant voltage load.

The control unit 90 is a control device including a well-known microcomputer including a CPU, ROM, RAM, flash memory, and the like. The control unit 90 acquires various signals and executes various controls based on the acquired information.

Specifically, the control unit 90 is a voltage sensor 52 that detects the power supply voltage VB of the first and second batteries 11 and 12 when the rotary electric machine 30 is driven, and a current IB that flows in the winding of each phase of the rotary electric machine 30. The detection value is acquired from the phase current sensor 53 for detecting the above, the rotation speed sensor 54 for detecting the rotation speed NE of the rotary electric machine 30, and the like. The control unit 90 controls the inverter 20 in order to control the control amount of the rotary electric machine 30 to the command value based on the acquired detected value. The control amount is, for example, torque.

Further, the control unit 90 generates the first to third SMR switching signals SA1 to SA3 in order to turn on and off the first to third SMR 14A, 14B, 15 based on the acquired detected value, and the generated first to third SMR switching. The signals SA1 to SA3 are output to the first to third SMRs 14A, 14B, and 15. Further, the control unit 90 sets the first to fourth charging switches 61 to 64 on and off based on the acquired detection value and the connection state of the first to fourth external charging terminals TB1 to TB4. Charge switching signals SB1 to SB4 are generated. Then, the generated first to fourth charge switching signals SB1 to SB4 are output to the first to fourth charge switches 61 to 64.

By the way, by connecting the high voltage auxiliary machine 40 between the positive electrode side power supply paths L1 and L2, the high voltage auxiliary machine 40 is electrically connected to the first and second batteries 11 and 12 ( Hereinafter, a comparative example) is also conceivable. In the comparative example, the positive electrode side terminal of the high voltage auxiliary machine 40 is connected between the first charging switch 61 and the first SMR 14A in the positive electrode side power supply path L1, and the first charging switch 62 in the negative electrode side power supply path L2. The negative electrode side terminal of the high voltage auxiliary machine 40 is connected between the second and third SMRs 14B and 15.

In this comparative example, if the second SMR 14B fails to turn off while the rotor of the rotary electric machine 30 is rotating at a high rotation speed, the connection between the first and second batteries 11 and 12 and the rotary electric machine 30 is released. Therefore, the counter electromotive voltage VR (see FIG. 11) generated by the rotation of the rotor of the rotary electric machine 30 is suppressed from being applied to the first and second batteries 11 and 12, and the first and second batteries 11 and 12 are suppressed. Damage is suppressed.

On the other hand, in the comparative example, since the high-voltage auxiliary machine 40 is connected in parallel with the inverter 20, when the second SMR 14B fails off, the connection between the rotary electric machine 30 and the high-voltage auxiliary machine 40 cannot be released by the second SMR 14B. Therefore, it is not possible to suppress the back electromotive voltage VR from being applied to the high voltage auxiliary machine 40, and the high voltage auxiliary machine 40 may be damaged.

Therefore, in the present embodiment, the high voltage auxiliary machine 40 is connected between the positive electrode side power supply path L1 and the negative electrode side charging path L4. Specifically, the positive electrode side terminal of the high voltage auxiliary machine 40 is connected between the first SMR 14A and the first charging switch 61 in the positive electrode side power supply path L1, and the second of the negative electrode side charging paths L4. The negative electrode side terminal of the high voltage auxiliary machine 40 is connected between the connection point P2 and the fourth charging switch 64. That is, the high voltage auxiliary machine 40 is connected to the first and second batteries 11 and 12 via the second connection point P2 on the negative electrode side, and is connected to the inverter 20 via the second SMR 14B.

According to the present embodiment described in detail above, the following effects can be obtained.

-In the present embodiment, the high voltage auxiliary machine 40 is connected to the inverter 20 via the second SMR 14B on the negative electrode side. Therefore, if the second SMR 14B fails to turn off while the rotor of the rotary electric machine 30 is rotating at a high rotation speed and the second SMR 14B is turned off, the connection between the inverter 20 and the high voltage auxiliary machine 40 is cut off. As a result, it is possible to suppress the back electromotive voltage VR generated in the inverter 20 from being applied to the high voltage auxiliary machine 40, and it is possible to suppress damage to the high voltage auxiliary machine 40.

-In the present embodiment, the first and second batteries 11 and 12 are configured to be connectable to two types of chargers 50 and 200 that are different from each other. Then, the inverter 20, the first to third SMR14A, 14B, 15, and the high voltage auxiliary machine 40 are passed through the paths L1 to L4 connecting the chargers 50 and 200 and the first and second batteries 11 and 12. Is connected to the first and second batteries 11 and 12. Therefore, the configuration of the drive system 100 can be simplified as compared with the case where these configurations are connected to the first and second batteries 11 and 12 via a route other than these routes.

(Modified example of the first embodiment)
As shown in FIG. 2, the high voltage auxiliary machine 40 may be connected between the positive electrode side charging path L3 and the negative electrode side power supply path L2. Specifically, in the positive electrode side charging path L3, the positive electrode side terminal of the high voltage auxiliary machine 40 is connected between the first connection point P1 and the third charging switch 63, and in the negative electrode side power supply path L2. , The negative electrode side terminal of the high voltage auxiliary machine 40 may be connected between the second and third SMRs 14B and 15 and the second charging switch 62. In this case, the positive electrode side power supply path L1 corresponds to the "electrical path, first connection line", the first SMR14A corresponds to the "opening / closing part, first opening / closing part", and the positive electrode side charging path L3 corresponds to the "second connecting line". The first connection point P1 corresponds to the "intermediate point".

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIG. 3, focusing on the differences from the first embodiment. In FIG. 3, the same configuration as that shown in FIG. 1 above will be designated by the same reference number for convenience, and the description thereof will be omitted.

The present embodiment differs from the first embodiment in that the negative electrode side terminal of the high voltage auxiliary machine 40 is connected between the fourth charging switch 64 and the vehicle-mounted charger 50 in the negative electrode side charging path L4. .. That is, the fourth charging switch 64 is provided on the first and second batteries 11 and 12 side of the high voltage auxiliary machine 40 in the negative electrode side charging path L4. In this embodiment, the fourth charging switch 64 corresponds to the "second opening / closing part".

The control unit 90 turns on the fourth charging switch 64 while the in-vehicle charger 50 is charging the first and second batteries 11 and 12 and while the rotary electric machine 30 is driving, and turns it off in other cases. .. In the above other cases, the charging of the first and second batteries 11 and 12 by the external charger 200 is included.

According to the present embodiment described in detail above, the following effects can be obtained.

In the present embodiment, the fourth charging switch 64 is controlled to be turned on while the rotary electric machine 30 is being driven and the first and second batteries 11 and 12 are being charged by the in-vehicle charger 50. As a result, the high voltage auxiliary machine 40 can be operated while the rotary electric machine 30 is being driven.

-In the present embodiment, the fourth charging switch 64 is controlled to be turned off while the first and second batteries 11 and 12 are being charged by the external charger 200. As a result, during charging of the first and second batteries 11 and 12 by the external charger 200, the charging voltage generated by the external charger 200 is applied to the high voltage auxiliary machine 40, and the life of the high voltage auxiliary machine 40 is reduced. Can be suppressed.

(Modified example of the second embodiment)
As shown in FIG. 4, when the high voltage auxiliary device 40 is connected between the positive electrode side charging path L3 and the negative electrode side power supply path L2, the positive electrode side terminal of the high voltage auxiliary device 40 is connected to the positive electrode side charging path L3. Of these, the third charging switch 63 and the in-vehicle charger 50 may be connected. That is, the third charging switch 63 may be provided on the first and second batteries 11 and 12 side of the high voltage auxiliary machine 40 in the positive electrode side charging path L3. In this case, the third charging switch 63 corresponds to the "second opening / closing portion".

(Third Embodiment)
Hereinafter, the third embodiment will be described with reference to FIG. 5, focusing on the differences from the second embodiment. In FIG. 5, the same configuration as that shown in FIG. 3 above is designated by the same reference number for convenience, and the description thereof will be omitted.

The present embodiment is different from the second embodiment in that the fifth charging switch 65 is provided on the vehicle-mounted charger 50 side of the high-voltage auxiliary machine 40 in the negative electrode side charging path L4. In the present embodiment, the fifth charging switch 65 corresponds to the "third opening / closing portion". The control unit 90 sets the fifth charge switching signal SB5 so that the fifth charge switch 65 is turned on while the in-vehicle charger 50 is charging the first and second batteries 11 and 12, and is turned off in other cases. The generated fifth charge switching signal SB5 is output to the fifth charge switch 65. In the above other cases, the rotary electric machine 30 is being driven.

According to the present embodiment described in detail above, the fifth charging switch 65 is turned off while the rotary electric machine 30 is being driven. As a result, it is possible to suppress the noise generated in the vehicle-mounted charger 50 while driving the rotary electric machine 30 from propagating to the high-voltage auxiliary machine 40 via the negative electrode side charging path L4.

(Modified example of the third embodiment)
As shown in FIG. 6, the high voltage auxiliary device 40 is connected between the positive electrode side charging path L3 and the negative electrode side power supply path L2, and the positive electrode side terminal of the high voltage auxiliary device 40 is the positive electrode side charging path L3. When the third charging switch 63 and the vehicle-mounted charger 50 are connected, the sixth charging switch 66 is provided on the vehicle-mounted charger 50 side of the high-voltage auxiliary machine 40 in the positive electrode side charging path L3. You may. The sixth charging switch 66 is turned off while the rotary electric machine 30 is being driven by the sixth charging switching signal SB6 generated by the control unit 90. In this case, the sixth charging switch 66 corresponds to the "third opening / closing portion".

(Fourth Embodiment)
Hereinafter, the fourth embodiment will be described with reference to FIG. 7, focusing on the differences from the first embodiment. In FIG. 7, the same configuration as that shown in FIG. 1 above is designated by the same reference number for convenience, and the description thereof will be omitted.

The present embodiment is different from the first embodiment in that the drive system 100 includes the inverter 70 in addition to the inverter 20. In the present embodiment, the rotary electric machine 30 has two sets of three-phase windings (hereinafter referred to as winding groups) connected in a star shape. At the connection point between the upper arm switch and the lower arm switch in the inverter 20, one end of the winding of the corresponding phase in one winding group is connected. Further, one end of the winding of the corresponding phase in the other winding group is connected to the connection point of the upper arm switch and the lower arm switch in the inverter 70. Hereinafter, for the sake of distinction, the inverter 20 will be referred to as a first inverter 20, and the inverter 70 will be referred to as a second inverter 70.

The first inverter 20 is connected to the first and second batteries 11 and 12 via the positive and negative electrode side power supply paths L1 and L2. Specifically, the positive electrode side terminal of the inverter 20 is connected to the positive electrode side power supply path L1 connected to the positive electrode side terminals of the first and second batteries 11 and 12, and the first and second batteries 11, 12 The negative electrode side terminal of the inverter 20 is connected to the negative electrode side power supply path L2 connected to the negative electrode side terminal of 12.

Further, the second inverter 70 is connected to the first and second batteries 11 and 12 via the positive electrode side power supply paths L5 and L6 different from the positive electrode and negative electrode side power supply paths L1 and L2. Specifically, the positive electrode side terminal of the inverter 70 is connected to the positive electrode side power supply path L5 connected to the positive electrode side terminals of the first and second batteries 11 and 12, and the first and second batteries 11, 12 The negative electrode side terminal of the inverter 70 is connected to the negative electrode side power supply path L6 connected to the negative electrode side terminal of 12.

In the following, for the sake of distinction, the positive electrode and negative electrode side power supply paths L1 and L2 are referred to as the first positive electrode and negative electrode side power supply paths L1 and L2, and the positive electrode and negative electrode side power supply paths L5 and L6 are referred to as the second positive electrode and negative electrode side power supply paths. Called L5 and L6. In the present embodiment, the first positive electrode side power supply path L1 corresponds to the "first positive electrode side line", and the first negative electrode side power supply path L2 corresponds to the "first negative electrode side line, first connection line". The second positive electrode side power supply path L5 corresponds to the "second positive electrode side line, the second connection line", and the second negative electrode side power supply path L6 corresponds to the "second negative electrode side line".

The second positive electrode side power supply path L5 is provided in parallel with the first positive electrode side power supply path L1. Specifically, the ends of the second positive electrode side power supply path L5 on the first and second battery 11 and 12 sides are the third between the first connection point P1 and the first SMR14A in the first positive electrode side power supply path L1. At the connection point P3, it is connected to the first positive electrode side power supply path L1. Further, the end of the second positive electrode side power supply path L5 on the vehicle exterior charger 200 side is located at the fourth connection point P4 between the first charging switch 61 and the first external charging terminal TB1 in the first positive electrode side power supply path L1. , Is connected to the first positive electrode side power supply path L1. In this embodiment, the third connection point P3 corresponds to the "second intermediate point".

The second negative electrode side power supply path L6 is provided in parallel with the first negative electrode side power supply path L2. Specifically, the ends of the second negative electrode side power supply path L6 on the first and second battery 11 and 12 sides are the fifth between the second connection point P2 and the second SMR14B in the first negative electrode side power supply path L2. At the connection point P5, it is connected to the first negative electrode side power supply path L2. Further, the end of the second negative electrode side power supply path L6 on the vehicle exterior charger 200 side is at the sixth connection point P6 between the second charging switch 62 and the second external charging terminal TB2 in the first negative electrode side power supply path L2. , Is connected to the first negative electrode side power supply path L2. In this embodiment, the fifth connection point P5 corresponds to the "first intermediate point".

Seventh and eighth charging switches 67 and 68 are provided between the second inverter 70 and the first and second external charging terminals TB1 and TB2 in the second positive electrode and negative electrode side power supply paths L5 and L6. The seventh and eighth charging switches 67 and 68 are controlled by the control unit 90 so as to be turned on when charging the first and second batteries 11 and 12 using the external charger 200 and turned off in other cases. Will be done. The control unit 90 generates the 7th and 8th charge switching signals SB7 and SB8 in order to turn on and off the 7th and 8th charge switches 67 and 68 as described above, and the generated 7th and 8th charge switching signals SB7. , SB8 is output to the 7th and 8th charging switches 67 and 68. By turning off the seventh and eighth charging switches 67 and 68, it is possible to suppress the propagation of noise to the second inverter 70 via the first and second external charging terminals TB1 and TB2.

The power supply unit 10 includes fourth to sixth SMR17A, 17B, 18. The fourth SMR17A is provided in the second positive electrode side power supply path L5, and the fifth and sixth SMR17Bs and 18 are provided in the second negative electrode side power supply path L6. Therefore, the fourth to sixth SMR17A, 17B, and 18 are configured to be able to switch between the energized state and the energized cutoff state of the second inverter 70. Specifically, the control unit 90 generates the fourth to sixth SMR switching signals SA4 to SA6 in order to turn the fourth to sixth SMR17A, 17B, 18 on and off, and the generated fourth to sixth SMR switching signals SA4 to SA6. Is output to the 4th to 6th SMR17A, 17B, 18. In the present embodiment, the second SMR14B corresponds to the "first opening / closing part", and the fourth SMR17A corresponds to the "second opening / closing part".

In the second negative electrode side power supply path L6, the fifth and sixth SMRs 17B and 18 are connected in parallel. The sixth SMR 18 is a relay switch that precharges the capacitance components (for example, smoothing capacitors) contained in the second inverter 70 from the first and second batteries 11 and 12 when the rotary electric machine 30 is started. A resistance element 19 that suppresses an inrush current when precharging is performed is connected in series to the sixth SMR 18.

The fifth SMR17B is a relay switch that supplies power to the rotary electric machine 30 after precharging. The fifth SMR 17B is connected in parallel to the series connector of the sixth SMR 18 and the resistance element 19.

In the present embodiment, the high voltage auxiliary machine 40 is connected between the first positive electrode side power supply path L1 and the second negative electrode side power supply path L6. Specifically, in the first positive electrode side power supply path L1, the positive electrode side terminal of the high voltage auxiliary machine 40 is connected between the third connection point P3 and the first charging switch 61, and the second negative electrode side power supply. In the path L6, the negative electrode side terminal of the high voltage auxiliary machine 40 is connected between the fifth connection point P5 and the eighth charging switch 68. That is, the high voltage auxiliary machine 40 is connected to the first and second batteries 11 and 12 via the fifth connection point P5 on the negative electrode side, and is connected to the first inverter 20 via the second SMR 14B. .. Further, the high voltage auxiliary machine 40 is connected to the first and second batteries 11 and 12 via the third connection point P3 on the positive electrode side, and is connected to the second inverter 70 via the fourth SMR 17A. ..

According to the present embodiment described in detail above, the following effects can be obtained.

In the present embodiment, the high voltage auxiliary machine 40 is connected to the first inverter 20 via the second SMR 14B on the negative electrode side, and is connected to the second inverter 70 via the fourth SMR 17A on the positive electrode side. Therefore, if the second SMR14B fails to turn off while the rotor of the rotary electric machine 30 is rotating at a high rotation speed and the second SMR14B is turned off, the connection between the first inverter 20 and the high voltage auxiliary machine 40 is cut off. To. Further, if the 4th SMR17A fails to turn off while the rotor of the rotary electric machine 30 is rotating at a high rotation speed and the 4th SMR17A is turned off, the connection between the 2nd inverter 70 and the high voltage auxiliary machine 40 is cut off. To. As a result, even if an off failure occurs in either the second SMR14B or the fourth SMR17A, the counter electromotive voltage VR generated in the first and second inverters 20 and 70 due to the rotation of the rotor of the rotary electric machine 30 is the high voltage auxiliary machine 40. It is possible to suppress the application to the high voltage auxiliary machine 40, and it is possible to suppress damage to the high voltage auxiliary machine 40.

In the present embodiment, only the first positive electrode side power supply paths L1 and L2 and the second positive electrode side power supply paths L5 and L6 are used, and the second SMR14B is used between the first inverter 20 and the high voltage auxiliary machine 40. Is connected, and the 4th SMR17A is connected between the 2nd inverter 70 and the high voltage auxiliary machine 40. Therefore, the configuration of the drive system 100 can be simplified as compared with the case where the above connection is realized by using a path other than these paths such as the positive electrode side charging path L3 and L4.

(Modified example of the fourth embodiment)
As shown in FIG. 8, the high voltage auxiliary machine 40 may be connected between the second positive electrode side power supply path L5 and the first negative electrode side power supply path L2. Specifically, in the second positive electrode side power supply path L5, the positive electrode side terminal of the high voltage auxiliary machine 40 is connected between the third connection point P3 and the seventh charging switch 67, and the first negative electrode side power supply. In the path L2, the negative electrode side terminal of the high voltage auxiliary machine 40 may be connected between the fifth connection point P5 and the second charging switch 62. In this case, the first positive electrode side power supply path L1 corresponds to the "first connection line", the second negative electrode side power supply path L6 corresponds to the "second connection line", and the third connection point P3 corresponds to the "first intermediate point". The fifth connection point P5 corresponds to the "second intermediate point", the first SMR14A corresponds to the "first opening / closing part", and the fifth SMR17B corresponds to the "second opening / closing part".

(Fifth Embodiment)
Hereinafter, the fifth embodiment will be described with reference to FIGS. 9 to 11, focusing on the differences from the second embodiment. In FIG. 9, the same configuration as that shown in FIG. 3 above is designated by the same reference number for convenience, and the description thereof will be omitted.

The present embodiment is different from the second embodiment in that a ninth charging switch 69 is provided between the first and second batteries 11 and 12 in the positive electrode side charging path L3 and the vehicle-mounted charger 50. The ninth charging switch 69 has a capacity included in the vehicle-mounted charger 50 from the inverter 20 when the inverter 20 and the vehicle-mounted charger 50 are connected to each other while the rotor of the rotary electric machine 30 is rotating at a high rotation speed. It is a relay switch that precharges the components. The control unit 90 generates the ninth charge changeover signal SB9 in order to turn on / off the ninth charge switch 69 as described above, and outputs the generated ninth charge changeover signal SB9 to the ninth charge switch 69. A resistance element 71 that suppresses an inrush current during precharging is connected in series to the ninth charging switch 69.

The third charging switch 63 connects the inverter 20 and the vehicle-mounted charger 50 after precharging. The third charging switch 63 is connected in parallel to the series connecting body of the ninth charging switch 69 and the resistance element 71. In the present embodiment, the in-vehicle charger 50 corresponds to the "charger", the positive electrode side charging path L3 corresponds to the "electric path", and the third charging switch 63 corresponds to the "opening / closing portion".

By the way, when the switching element constituting the inverter 20 is cut off and turned off while the rotor of the rotary electric machine 30 is rotating at a high rotation speed, the control unit 90 turns off the first and second SMRs 14A and 14B. The connection between the first and second batteries 11 and 12 and the high-voltage auxiliary machine 40 and the rotary electric machine 30 is released. However, for example, if the rotary electric machine 30 is an MG with a strong magnetic force and the rising speed of the counter electromotive voltage VR generated by the rotation of the rotor of the rotary electric machine 30 is fast, the first and second SMRs 14A and 14B are switched off by the time The counter electromotive voltage VR may rise beyond the permissible voltage VF (see FIG. 7) of the first and second batteries 11 and 12 and the high voltage auxiliary machine 40. In particular, the permissible voltage VF of the high voltage auxiliary machine 40 is lower than the permissible voltage VF of the first and second batteries 11 and 12. Therefore, if the counter electromotive voltage VR rises beyond the permissible voltage VF of the high voltage auxiliary machine 40, the high voltage auxiliary machine 40 may be damaged.

Therefore, in the present embodiment, the connection process for connecting the inverter 20 and the in-vehicle charger 50 is performed while the rotor of the rotary electric machine 30 is rotating at a high rotation speed. The inverter 20 and the high voltage auxiliary machine 40 are connected to the positive electrode side charging path L3 at the first connection point P1 between the first and second batteries 11 and 12 and the vehicle-mounted charger 50 in the positive electrode side charging path L3. ing. The third charging switch 63 is provided between the first connection point P1 in the positive electrode side charging path L3 and the vehicle-mounted charger 50. In the connection process, the third charging switch 63 is turned on while the rotor of the rotary electric machine 30 is rotating at a high rotation speed. In the present embodiment, the first connection point P1 corresponds to the "first intermediate point and the second intermediate point".

The vehicle-mounted charger 50 includes a first capacitance component 51 connected in parallel to the first and second batteries 11 and 12, and the inverter 20 contains a second capacitance component connected in parallel to the first and second batteries 11 and 12. 21 is included. In the connection process, the third charging switch 63 is turned on while the rotor of the rotary electric machine 30 is rotating at a high rotation speed so that the first capacitance component 51 and the second capacitance component 21 are connected in parallel. .. That is, in the drive system 100, the combined capacity connected in parallel to the first and second batteries 11 and 12 is increased. Therefore, when the inverter 20 shuts off the gate while the rotor of the rotary electric machine 30 is rotating at a high rotation speed, the increase in the counter electromotive voltage VR is suppressed by the increased combined capacity, and the high voltage auxiliary machine 40 Damage is suppressed.

The second capacitance component 21 of the inverter 20 is, for example, a film capacitor, and is resistant to the ripple current generated by the rotary electric machine 30. On the other hand, the first capacitance component 51 of the vehicle-mounted charger 50 is, for example, an electric field capacitor, and although it has a large capacitance per volume, it is weaker in ripple current than the second capacitance component 21. Here, the ripple current is a current IB of the rotary electric machine 30 that fluctuates due to switching of the upper arm switch and the lower arm switch in the inverter 20, and the larger the amplitude of the current IB, the larger the ripple current. If it is vulnerable to ripple current and has low resistance to ripple current, the ripple current causes heat generation and failure.

By configuring the in-vehicle charger 50 using the first capacitance component 51, which is vulnerable to ripple current and is relatively inexpensive, an increase in the product cost of the drive system 100 can be suppressed. On the other hand, if the first capacitance component 51 is vulnerable to ripple current, there is a concern that the vehicle-mounted charger 50 including the first capacitance component 51 may be damaged when the third charging switch 63 is turned on.

In the present embodiment, the third charging switch 63 is turned on when the rotor of the rotary electric machine 30 is rotating at a high rotation speed and the generation of the ripple current is suppressed. As a result, an increase in the counter electromotive voltage VR can be suppressed by using the first capacitance component 51, which is weak against the ripple current.

Next, a flowchart of the connection process is shown. FIG. 10 is repeatedly executed by the control unit 90 at a predetermined cycle while the rotary electric machine 30 is being driven.

When the connection process is started, first, in step S10, the rotation speed NE of the rotary electric machine 30 is acquired by using the rotation speed sensor 54. In the following step S12, it is determined whether or not the rotary electric machine 30 is in a high rotation state. Specifically, it is determined whether or not the rotation speed NE acquired in step S10 is larger than the threshold value Nth.

If an affirmative determination is made in step S12, it is determined in step S14 whether or not the third charging switch 63 is off. Whether or not the third charge switch 63 is off is determined based on the third charge changeover signal SB3. If a negative determination is made in step S14, the connection process ends.

If an affirmative determination is made in step S14, the ninth charging switch 69 is turned on in step S16 to start precharging the first capacitance component 51 included in the vehicle-mounted charger 50. In the following step S18, it is determined whether or not a predetermined precharge period for precharging the first volume component 51 has elapsed.

If a negative determination is made in step S18, step S18 is repeated. On the other hand, if an affirmative determination is made in step S18, the third charging switch 63 is turned on in step S20 to end the connection process.

Further, if a negative determination is made in step S12, it is determined in step S22 whether or not the third charging switch 63 is turned on. If a negative determination is made in step S22, the connection process ends. On the other hand, if an affirmative determination is made in step S22, the third charging switch 63 is turned off in step S24 to end the connection process. As a result, the first capacitance component 51 is discharged.

Subsequently, FIG. 11 shows an example of the connection process of the present embodiment. FIG. 11 shows the transition of the counter electromotive voltage VR when the inverter 20 shuts off the gate while the rotary electric machine 30 is being driven. In FIG. 11, (A) shows the transition of the counter electromotive voltage VR, (B) shows the transition of the on / off state of the third charging switch 63, and (C) shows the transition of the failure flag FB. , (D) show the transition of the on / off state of the first and second SMR14A and 14B. The failure flag FB indicates whether or not a gate cutoff has occurred in the inverter 20, and is turned off when the gate cutoff has not occurred in the inverter 20 and turned on when the gate cutoff has occurred in the inverter 20. It becomes.

In (A) and (B), the transition of each value when the third charging switch 63 is turned on when the rotary electric machine 30 is in a high rotation state is shown by a solid line, and the third charging switch 63 is turned on. The transition of each value when it is not done is shown by a broken line.

As shown in FIG. 11, when the rotation speed NE of the rotary electric machine 30 becomes larger than the threshold value Nth at time t1, the third charging switch 63 is turned on. After that, when the inverter 20 shuts off the gate at time t2, the counter electromotive voltage VR rises from the initial voltage VS. Then, the first and second SMRs 14A and 14B are turned off at the time t4 when the predetermined response period TA has elapsed from the time t2.

As shown by a broken line in FIG. 11, if the third charging switch 63 is not turned on even when the rotary electric machine 30 is in a high rotation state, the increase in the counter electromotive voltage VR is suppressed only by the second capacitance component 21. For example, it is assumed that the rotary electric machine 30 is an MG with a strong magnetic force, and the rising speed of the counter electromotive voltage VR generated by the rotation of the rotor of the rotary electric machine 30 is fast. In this case, at time t3 before the first and second SMRs 14A and 14B are turned off, the counter electromotive voltage VR rises beyond the allowable voltage VF of the high voltage auxiliary machine 40, causing damage to the high voltage auxiliary machine 40. It cannot be suppressed.

In the present embodiment, as shown by the solid line in FIG. 11, when the rotary electric machine 30 is in a high rotation state, the third charging switch 63 is turned on, and the increase in the counter electromotive voltage VR is the first capacitance component 51 and the second. It is suppressed by the synthetic volume of the volume component 21. As a result, the rising speed of the counter electromotive voltage VR is suppressed, and the counter electromotive voltage VR is suppressed from rising beyond the permissible voltage VF of the high voltage auxiliary machine 40 before the time t4. As a result, damage to the high voltage auxiliary machine 40 is suppressed.

According to the present embodiment described in detail above, the following effects can be obtained.

In the present embodiment, when the rotor of the rotary electric machine 30 is rotating at a high rotation speed, the in-vehicle charger 50 and the inverter 20 are connected in parallel. Since the vehicle-mounted charger 50 and the inverter 20 contain capacitance components 51 and 21, respectively, the combined capacity of the drive system 100 is increased by connecting the vehicle-mounted charger 50 and the inverter 20 in parallel. Therefore, when the inverter 20 shuts off the gate while the rotor of the rotary electric machine 30 is rotating at a high rotation speed, the increase in the counter electromotive voltage VR can be suppressed by the increased combined capacity, and the high voltage auxiliary machine 40 can be used. Damage can be suppressed.

-In the present embodiment, since the in-vehicle charger 50 is configured by using the first capacitance component 51, which is weak against the ripple current and is relatively inexpensive, it is possible to suppress an increase in the product cost of the drive system 100. Further, since the third charging switch 63 is turned on when the rotary electric machine 30 is in a high rotation state and the generation of the ripple current is suppressed, the counter electromotive voltage is generated by using the first capacitance component 51 which is weak against the ripple current. The increase in VR can be suppressed. That is, it is possible to suitably suppress the increase in the counter electromotive voltage VR while suppressing the increase in the product cost.

(Modified example of the fifth embodiment)
In the fifth embodiment, it is assumed that the first and second SMRs 14A and 14B are normal. Therefore, as shown in FIG. 12, the high-voltage auxiliary machine 40 may be connected in parallel with the inverter 20 between the positive electrode side power supply paths L1 and L2.

(Other embodiments)
Each of the above embodiments may be modified as follows.

-In the first to third and fifth embodiments, the first to third SMR14A, 14B, 15 are provided in the positive electrode and negative electrode side power supply paths L1 and L2, but for example, the first SMR14A is not necessarily provided. There is no need.

Similarly, in the fourth embodiment, the first to third SMR14A, 14B, 15 are provided in the first positive electrode side power supply paths L1 and L2, and the fourth positive electrode side power supply paths L5 and L6 are provided with the first to third SMR14A, 14B, 15. ~ 6th SMR17A, 17B, 18 are provided, but the present invention is not limited to this. For example, the first, fifth, and sixth SMRs 14A, 17B, and 18 do not necessarily have to be provided. When the first, fifth, and sixth SMRs 14A, 17B, and 18 are not provided, the first and second batteries 11 and 12 and the high voltage auxiliary machine 40 can be connected without going through the SMR.

11 ... 1st battery, 12 ... 2nd battery, 14B ... 2nd SMR, 20 ... inverter, 30 ... rotary electric machine, 40 ... high voltage auxiliary machine, L2 ... negative electrode side power supply path.

Claims (6)

Power storage device (11, 12) and
An inverter (20) connected to the power storage device via an electric path (L2),
A rotary electric machine (30) connected to the inverter and input / output of electric power to / from the power storage device via the inverter.
An opening / closing part (14B) provided in the electric path and
A drive system including a load (40) connected to the power storage device via an intermediate point between the opening / closing portion and the power storage device in the electric path, and operated by electric power from the power storage device. The electrical path is
A first positive electrode side line (L1) connecting the positive electrode side terminal of the power storage device and the positive electrode side terminal of the first charger (200), and
A first negative electrode side line (L2) connecting the negative electrode side terminal of the power storage device and the negative electrode side terminal of the first charger, and
A second positive electrode side line (L3) connecting the positive electrode side terminal of the power storage device and the positive electrode side terminal of the second charger (50), and
It has a second negative electrode side line (L4) connecting the negative electrode side terminal of the power storage device and the negative electrode side terminal of the second charger.
The inverter is connected between the first positive electrode side line and the first negative electrode side line.
The opening / closing portion is a first opening / closing portion (14B), and is provided on a first connection line (L2) which is one of the first positive electrode side line and the first negative electrode side line.
The load is the second connection line (L4) on the same electrode side as the first connection line among the second positive electrode side line and the second negative electrode side line, the first positive electrode side line, and the first negative electrode side. It is connected to a line (L1) different from the first connection line among the lines.
The second connection line is connected to the first connection line at the intermediate point between the opening / closing portion and the power storage device in the first connection line.
A second opening / closing unit (64) provided on the power storage device side of the load in the second connection line, and
A control unit (90) for turning on / off the second opening / closing unit is provided.
The control unit turns on the second opening / closing unit while the rotary electric machine is being driven and the second charger is charging the power storage device, and the second charging unit is charging the power storage device by the first charger. The drive system according to claim 1, wherein the opening / closing unit is turned off. The second connection line includes a third opening / closing portion (65) provided on the side of the second charger with respect to the load.
The drive system according to claim 2, wherein the control unit turns on the third opening / closing unit while charging the power storage device by the second charger, and turns off the third opening / closing unit while driving the rotary electric machine. .. The rotary electric machine has a polyphase winding and has a multi-phase winding.
The inverters are a first inverter (20) connected to a part of the polyphase windings and a second inverter connected to at least a part of the remaining windings. Including (70)
The electrical path is
A first positive electrode side line (L1) connecting the positive electrode side terminal of the power storage device and the positive electrode side terminal of the first inverter, and
A first negative electrode side line (L2) connecting the negative electrode side terminal of the power storage device and the negative electrode side terminal of the first inverter, and
A second positive electrode side line (L5) connecting the positive electrode side terminal of the power storage device and the positive electrode side terminal of the second inverter, and
It has a second negative electrode side line (L6) connecting the negative electrode side terminal of the power storage device and the negative electrode side terminal of the second inverter.
The opening / closing part
A first opening / closing portion provided on a first connection line (L2) which is one of the first positive electrode side line and the first negative electrode side line.
It has a second opening / closing portion provided on a second connection line (L5) on the pole side different from the first connection line among the second positive electrode side line and the second negative electrode side line.
The line (L6) of the second positive electrode side line and the second negative electrode side line different from the second connection line is between the first opening / closing portion and the power storage device of the first connection line. It is connected to the first connection line at the first intermediate point, and is connected to the first connection line.
The line (L1) of the first positive electrode side line and the first negative electrode side line different from the first connection line is between the second opening / closing portion and the power storage device of the second connection line. It is connected to the second connection line at the second intermediate point, and is connected to the second connection line.
The load is a line different from the first connection line among the first positive electrode side line and the first negative electrode side line, and the second connection line among the second positive electrode side line and the second negative electrode side line. The drive system according to claim 1, which is connected to a line different from the above. Power storage device (11, 12) and
A charger (50) connected to the power storage device via an electric path (L3), and
An inverter (20) connected to the power storage device via a first intermediate point in the electric path, and an inverter (20).
A rotary electric machine (30) connected to the inverter and input / output of electric power to / from the power storage device via the inverter.
A load (40) connected to the power storage device via a second intermediate point in the electric path and operated by electric power from the power storage device, and
Of the electric paths, an opening / closing portion (63) provided between the first intermediate point and the second intermediate point and the charger, and
A control unit (90) for controlling the opening / closing unit is provided.
The charger contains a first capacitance component (51) connected in parallel to the power storage device.
The inverter contains a second capacitance component (21) connected in parallel to the power storage device.
The control unit is a drive system that turns on the opening / closing unit when the rotor of the rotary electric machine is in a high rotation state. The drive system according to claim 5, wherein the first capacitance component is a capacitance component having a resistance to a ripple current generated by the rotary electric machine lower than that of the second capacitance component.

Images