JP7243676B2 - Power converter control circuit - Google Patents

Description

The present invention relates to a control circuit for a power converter having switches on upper and lower arms electrically connected to each phase winding of a rotating electric machine.

As this type of control circuit, when it is determined that an abnormality has occurred in a rotating electric machine or the like, there is known one that performs shutdown control for forcibly switching off the switches of the upper and lower arms. When shutdown control is performed, if a back electromotive voltage is generated in the windings due to the rotation of the rotor that constitutes the rotating electric machine, the line voltage of the windings is connected in parallel to the series connection of the switches of the upper and lower arms. may be higher than the voltage of the high-voltage storage unit. A situation in which the line voltage becomes high can occur, for example, when the field magnetic flux amount of the rotor is large or when the rotational speed of the rotor is high.

If the line-to-line voltage of the winding becomes higher than the voltage of the high-voltage storage unit, even if shutdown control is performed, the closed circuit including the diode, the winding, and the high-voltage storage unit connected in anti-parallel to the switch is closed. So-called regeneration is performed in which the induced current generated in the line flows. As a result, the DC voltage on the side of the high-voltage storage unit of the power converter rises significantly, and there is concern that at least one of the high-voltage storage unit, the power converter, and devices other than the power converter connected to the high-voltage storage unit may fail. .

In order to deal with such a problem, as described in Patent Document 1, a control circuit that performs short-circuit control by turning on the switch in one of the upper and lower arms and turning off the switch in the other arm is provided. Are known. Specifically, the control circuit has an output stage drive control section that becomes operable by being supplied with power from the power supply unit and drives the switches of the upper and lower arms. The output stage drive control section performs the above short-circuit control. Here, when the supply voltage of the power supply unit is lower than the threshold, it is determined that an abnormality has occurred in the power supply unit. In this case, the output stage drive control section performs the above short-circuit control by supplying the power of the high voltage storage section independent of the power supply unit via the emergency operation power supply section.

Japanese Patent Publication No. 2013-506390

The inventors of the present application have found that the above configuration may cause the following problems.

In order to reduce the noise generated from the power supply unit in the external charging state, in which power is supplied from the external power supply to the high-voltage storage unit and the switch of the upper and lower arms is turned off, it is conceivable to stop the power supply unit. be done. However, in this case the supply voltage of the power supply unit drops below the threshold. Therefore, in order to execute the short-circuit control, power is supplied to the output stage drive control section via the emergency operation power supply section even though the power supply unit does not have an abnormality. In this case, noise is generated as the emergency operation power supply unit operates. As a result, a problem may arise that noise generated from the control circuit cannot be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a main object thereof is to provide a power converter control circuit capable of reducing noise.

The present invention provides a low-voltage storage unit provided in a low-voltage region, a high-voltage storage unit provided in a high-voltage region electrically insulated from the low-voltage region, a multiphase rotating electrical machine, and each phase of the rotating electrical machine. A control circuit for a power converter applied to a system comprising a power converter having upper and lower arm switches electrically connected to the windings of the An insulated power supply provided in a low-voltage region and a high-voltage region, which generates electric power by being fed from the low-voltage storage unit, an abnormal power supply to generate power by being fed from the high-voltage storage unit, and an output voltage of the insulated power supply. After the detected output voltage starts to drop, the power generated by the abnormal power supply is used to turn on the switch in either one of the upper and lower arms, and the switch in the other arm. and a state for determining an external charging state in which power is supplied from the charging device to the high-voltage storage unit and the switch in the upper and lower arms is turned off. a determination unit, wherein, when the state determination unit determines that the battery is in the external charging state, the power generated by the abnormality power supply is supplied to the gate of the switch that is turned on by the short-circuit control. is prohibited, or the power generated by the abnormality power supply is reduced more than before the determination that the external charging state is present.

In order to reduce noise generated from the isolated power supply in the external charging state, it is conceivable to stop the isolated power supply. However, in this case, the output voltage of the insulated power supply drops, so the short-circuit control is performed by the abnormality control unit using the power generated by the abnormality power supply. In this case, noise is generated as the abnormal power supply operates.

In this regard, in the present invention, in the external charging state, the power generated by the emergency power supply is prohibited from being supplied to the gate of the switch that is turned on by short-circuit control. This reduces noise generated from the abnormal power supply. Alternatively, in the present invention, the power generated by the abnormality power supply is reduced compared to before it is determined that the vehicle is in the external charging state. This reduces the power consumption of the abnormal power supply, thereby reducing noise generated from the abnormal power supply.

As described above, according to the present invention, noise generated from the abnormal power supply can be reduced, so that noise generated from the control circuit can be reduced.

1 is an overall configuration diagram of a control system according to a first embodiment; FIG. The figure which shows a control circuit and its peripheral structure. 4 is a flowchart showing control in an external charging state; 4 is a time chart showing an example of control in an external charging state; The figure which shows the control circuit which concerns on 2nd Embodiment, and its peripheral structure. 4 is a time chart showing an example of control in an external charging state; The figure which shows the lower arm insulated power supply and its peripheral structure which concern on 3rd Embodiment. 4 is a time chart showing an example of control in an external charging state; FIG. 11 is a flowchart showing control in an external charging state according to the fourth embodiment; FIG. The figure which shows the control circuit which concerns on 5th Embodiment, and its peripheral structure.

<First embodiment>
A first embodiment embodying a control circuit according to the present invention will be described below with reference to the drawings. The control circuit according to this embodiment is applied to a three-phase inverter as a power converter. In this embodiment, a control system including a control circuit and an inverter is mounted on a vehicle such as an electric vehicle or a hybrid vehicle.

As shown in FIG. 1 , the control system 10 includes a rotating electric machine 11 and an inverter 13 . The rotary electric machine 11 is a vehicle-mounted main machine, and its rotor can transmit power to drive wheels (not shown). In this embodiment, a synchronous machine is used as the rotary electric machine 11, and more specifically, a permanent magnet synchronous machine is used.

The inverter 13 has a switching device section 20 . The switching device section 20 includes serially connected bodies of upper arm switches SWH and lower arm switches SWL for three phases. In each phase, the first end of the winding 12 of the rotary electric machine 11 is connected to the connection point between the upper and lower arm switches SWH and SWL. A second end of each phase winding 12 is connected at a neutral point. The phase windings 12 are arranged with an electrical angle of 120 degrees from each other. Incidentally, in this embodiment, voltage-controlled semiconductor switching elements, more specifically, IGBTs, are used as the switches SWH and SWL. Upper and lower arm diodes DH and DL, which are freewheel diodes, are connected in anti-parallel to the upper and lower arm switches SWH and SWL.

A positive terminal of a high-voltage power supply 30 as a "high-voltage storage unit" is connected to a collector, which is a high-potential side terminal of each upper arm switch SWH, via a high-potential side electric path 22H. A negative terminal of a high-voltage power supply 30 is connected to an emitter, which is a low-potential side terminal of each lower arm switch SWL, via a low-potential side electric path 22L. In this embodiment, the high-voltage power supply 30 is a secondary battery, and its output voltage (rated voltage) is, for example, 100 V or higher.

A first cutoff switch 23a is provided in the high potential side electric path 22H, and a second cutoff switch 23b is provided in the low potential side electric path 22L. Each switch 23a, 23b is, for example, a relay or a semiconductor switching element. Here, the switches 23a and 23b may be driven by the control circuit 50 provided in the inverter 13, or may be driven by a control device higher than the control circuit 50 (hereinafter referred to as upper ECU 33).

The inverter 13 has a smoothing capacitor 24 . The smoothing capacitor 24 connects the high potential side electrical path 22H closer to the switching device section 20 than the first cutoff switch 23a and the low potential side electrical path 22L closer to the switching device section 20 than the second cutoff switch 23b. electrically connected.

The control system 10 includes an onboard electrical device 25 . The in-vehicle electrical device 25 includes, for example, at least one of an electric compressor and a DCDC converter. The electric compressor constitutes a vehicle interior air conditioner, and is powered by a high-voltage power supply 30 and driven to circulate the refrigerant in the vehicle-mounted refrigeration cycle. The DCDC converter steps down the output voltage of the high-voltage power supply 30 and supplies it to an in-vehicle low-voltage load. The low voltage load includes the low voltage power supply 31 shown in FIG. In this embodiment, the low-voltage power supply 31 is a secondary battery whose output voltage (rated voltage) is lower than the output voltage (rated voltage) of the high-voltage power supply 30 (for example, 12 V), such as a lead-acid battery.

The control system 10 has a charging device 40 . The charging device 40 is provided with a charging connector, and an external power source (not shown) can be electrically connected to the charging connector. The external power supply is, for example, a 100V single-phase AC commercial power supply. Charging device 40 converts AC power supplied from an external power supply into DC power and supplies the DC power to high-voltage power supply 30 .

The host ECU 33 shown in FIG. 2 supplies power to the charging device 40 from the external power source to the high-voltage power source 30 via the charging device 40 on condition that the external power source is electrically connected to the charging connector. Instructs execution of charging control. In this case, the control circuit 50 keeps the switches SWH, SWL, 23a, 23b off.

Next, the configuration of the control circuit 50 will be described. The control circuit 50 has an input circuit 60 and a power supply circuit 61 . A positive terminal of the low-voltage power supply 31 is connected to the input circuit 60 via the fuse 32 . A ground is connected to the negative terminal of the low-voltage power supply 31 as a ground portion. The power supply circuit 61 steps down the first voltage V1 output by the input circuit 60 to generate a second voltage V2 (eg, 5 V).

The control circuit 50 has a microcomputer 62 . The microcomputer 62 includes a CPU and other peripheral circuits. The microcomputer 62 generates a switching command for each switch SWH, SWL of the inverter 13 in order to control the control amount of the rotary electric machine 11 to the command value. The controlled variable is, for example, torque. The microcomputer 62 generates a switching command for normal drive control to alternately turn on the upper arm switch SWH and the lower arm switch SWL in each phase in order to control the control amount to the command value.

A peripheral circuit provided in the microcomputer 62 includes an input/output unit for exchanging signals with the outside. A signal instructing execution of external charging control is input to the microcomputer 62 from the host ECU 33 . In this case, the microcomputer 62 generates switching commands for turning off the switches SWH and SWL. After that, the host ECU 33 supplies power from the charging device 40 to the high-voltage power supply 30 . Thereby, the microcomputer 62 determines that the control system 10 is in the external charging state. In this embodiment, the microcomputer 62 corresponds to the "state determination section". In addition to the microcomputer 62 , the input circuit 60 and power supply circuit 61 are provided in the low voltage region of the control circuit 50 .

The control circuit 50 includes an upper arm insulated power supply 70 , a lower arm insulated power supply 71 , an upper arm driver 72 and a lower arm driver 73 . In this embodiment, the upper and lower arm insulated power supplies 70 and 71 and the upper and lower arm drivers 72 and 73 are individually provided corresponding to the respective upper and lower arm switches SWH and SWL. For this reason, a total of six insulated power supplies are provided for the upper and lower arms, and a total of six drivers are provided for the upper and lower arms.

The upper arm isolated power supply 70 and the upper arm driver 72 are provided in the low voltage area and the high voltage area across the boundary between the low voltage area and the high voltage area electrically insulated from the low voltage area in the control circuit 50 . Based on the first voltage V1 supplied from the input circuit 60, the upper arm insulated power supply 70 generates an upper arm drive voltage VdH to be supplied to the upper arm driver 72 and outputs it to the high voltage region. The configuration of the upper arm driver 72 on the high voltage region side is configured to be operable when the upper arm drive voltage VdH is supplied. configured to be operable by The configuration on the low voltage region side of the upper arm driver 72 is configured to be operable by being supplied with the second voltage V2 of the power supply circuit 61 . In this embodiment, the configuration of the upper arm driver 72 on the high voltage region side corresponds to the "switch driving section".

A switching command from the microcomputer 62 is input to the upper arm driver 72 . The upper arm driver 72 supplies charging current to the gate of the upper arm switch SWH when the switching command is an ON command. As a result, the gate voltage of the upper arm switch SWH becomes equal to or higher than the threshold voltage Vth, and the upper arm switch SWH is turned on. On the other hand, when the switching command from the microcomputer 62 is an OFF command, the upper arm driver 72 causes the discharge current to flow from the gate of the upper arm switch SWH to the emitter side. As a result, the gate voltage of the upper arm switch SWH becomes less than the threshold voltage Vth, and the upper arm switch SWH is turned off.

The lower arm insulated power supply 71 and the lower arm driver 73 are provided in the low voltage area and the high voltage area across the boundary between the low voltage area and the high voltage area in the control circuit 50 . The lower arm insulated power supply 71 generates a lower arm drive voltage VdL to be supplied to the lower arm driver 73 based on the first voltage V1 supplied from the input circuit 60, and outputs it to the high voltage region. The configuration of the lower arm driver 73 on the high voltage region side is configured to be operable when the lower arm drive voltage VdL is supplied. configured to be operable by The configuration of the lower arm driver 73 on the low voltage region side is configured to be operable by being supplied with the second voltage V2 of the power supply circuit 61 . In the present embodiment, the configuration of the lower arm driver 73 on the high voltage region side corresponds to the "switch driving section".

A switching command from the microcomputer 62 is input to the lower arm driver 73 . The lower arm driver 73 supplies charging current to the gate of the lower arm switch SWL when the switching command is an ON command. As a result, the gate voltage of the lower arm switch SWL becomes equal to or higher than the threshold voltage Vth, and the lower arm switch SWL is turned on. On the other hand, when the switching command from the microcomputer 62 is an OFF command, the lower arm driver 73 causes the discharge current to flow from the gate of the lower arm switch SWL to the emitter side. As a result, the gate voltage of the lower arm switch SWL becomes less than the threshold voltage Vth, and the lower arm switch SWL is turned off.

The control circuit 50 includes a determination signal transmission section 74 , an abnormality power supply 80 and an abnormality control section 81 . The determination signal transmission part 74 is provided in the low pressure region and the high pressure region across the boundary between the low pressure region and the high pressure region. The determination signal transmission unit 74 transmits the first signal Sg1 output from the microcomputer 62 to the abnormality control unit 81 while electrically insulating the low voltage region and the high voltage region. The first signal Sg1 is a signal for transmitting to the abnormality control unit 81 that the abnormality power supply 80 is prohibited from being activated.

The abnormality power supply 80 and the abnormality control section 81 are provided in the high voltage region. The abnormality control unit 81 outputs the second signal Sg2 to the abnormality power supply 80 when the first signal Sg1 is received. The second signal Sg2 is a signal indicating that activation of the abnormal power supply 80 is prohibited. The abnormality power supply 80 generates the abnormality drive voltage Veps by being supplied with the output voltage VH of the smoothing capacitor 24 . Various power supplies such as a switching power supply and a series power supply are used as the power supply 80 for abnormality.

The control circuit 50 includes a normal power supply path 82, a normal diode 83, an abnormal power supply path 84, and an abnormal diode 85 in its high voltage region. The normal power supply path 82 connects the output side of the lower arm insulated power supply 71 and the lower arm driver 73 and supplies the lower arm drive voltage VdL to the structure of the lower arm driver 73 on the high voltage region side. The normal diode 83 is provided at an intermediate position in the normal power supply path 82 with its anode connected to the output side of the lower arm insulated power supply 71 .

The abnormal power supply 80 and the lower arm driver 73 side of the normal diode 83 in the normal power supply path 82 are connected by an abnormal power supply path 84 . The abnormality diode 85 is provided in the abnormality power supply path 84 with its anode connected to the abnormality power supply 80 . The abnormality power supply path 84 supplies the abnormality drive voltage Veps to the structure of the lower arm driver 73 on the high voltage region side.

Next, three-phase short-circuit control that is performed when an abnormality occurs in the control system 10 will be described. Consider a situation in which the upper arm drive voltage VdH and the lower arm drive voltage VdL decrease as a situation in which the three-phase short-circuit control is performed. Such a situation occurs due to an abnormality in the control circuit 50, for example. Here, the abnormality in the control circuit means an abnormality in which the upper and lower arm drive voltages VdH and VdL cannot be output from the upper and lower arm insulated power supplies 70 and 71 . Abnormalities in which the upper and lower arm drive voltages VdH and VdL cannot be output from the upper and lower arm insulated power supplies 70 and 71 include an abnormality in the upper and lower arm insulated power supplies 70 and 71 and an upper and lower arm insulated power supply from the low voltage power supply 31. 70 and 71 are included. Here, an abnormality in which power cannot be supplied from the low-voltage power supply 31 to the upper and lower arm insulated power supplies 70 and 71 occurs when, for example, an electric path from the low-voltage power supply 31 to the upper and lower arm insulated power supplies 70 and 71 is disconnected. It should be noted that the abnormality described above is caused by, for example, a vehicle collision.

A lower arm drive voltage VdL is supplied to the abnormality control unit 81 via a normal power supply path 82 . The abnormality control unit 81 detects the lower arm drive voltage VdL and instructs the abnormality power supply 80 to start after the detected lower arm drive voltage VdL starts to decrease. As a result, the abnormality drive voltage Veps starts to be output from the abnormality power supply 80 to the structure of the lower arm driver 73 on the high voltage region side.

Specifically, the abnormality control unit 81 activates the abnormality power supply 80 after a sufficient period of time from when the detected lower arm drive voltage VdL starts to decrease until the upper arm switch SWH is turned off. instruct. This is to prevent the upper and lower arms from short-circuiting.

In the present embodiment, when the abnormality control unit 81 determines that the detected lower arm drive voltage VdL has fallen below the short-circuit control threshold value Vp after the detected lower arm drive voltage VdL starts to decrease, the abnormality power supply 80 command to start the Here, the short-circuit control threshold Vp is set to a value at which it can be determined that a sufficient period of time has passed until the upper arm switch SWH is turned off. It is good if it is. Note that, in the present embodiment, the short-circuit control threshold Vp corresponds to the "threshold".

After that, the abnormality control section 81 outputs a three-phase short circuit control command to the configuration of the lower arm driver 73 on the high voltage region side. As a result, the lower arm driver 73 turns on the lower arm switches SWL for three phases. As a result, three-phase short-circuit control is performed in which the lower arm switches SWL for three phases are turned on and the upper arm switches SWH for three phases are turned off.

Control in the external charging state will be described with reference to FIG. This control is repeatedly executed at a predetermined cycle.

In step S10, the microcomputer 62 determines whether the control system 10 is in the external charging state. If the control system 10 determines that it is not in the external charging state, the process ends. On the other hand, when the control system 10 determines that it is in the external charging state, the process proceeds to step S11, and the microcomputer 62 outputs the first signal Sg1. As a result, the first signal Sg1 is transmitted to the abnormality control section 81 via the determination signal transmission section 74 .

In step S12, when the first signal Sg1 is input to the abnormality control section 81, the abnormality control section 81 outputs the second signal Sg2. Thereby, the second signal Sg2 is transmitted to the power supply 80 for abnormality. By inputting the second signal Sg2 to the abnormality power supply 80, activation of the abnormality power supply 80 in the externally charged state is prohibited. In addition, the abnormality control unit 81 lowers the short circuit control threshold Vp to 0V or less, specifically, sets the short circuit control threshold Vp to 0V.

At step S13, the microcomputer 62 outputs the third signal Sg3. The third signal Sg3 is a signal indicating that the upper and lower arm insulated power supplies 70 and 71 should be stopped. A third signal Sg3 output from the microcomputer 62 is transmitted to the upper and lower arm insulated power supplies 70 and 71 . By inputting the third signal Sg3 to the upper and lower arm insulated power supplies 70 and 71, the upper and lower arm insulated power supplies 70 and 71 are stopped in the external charging state. As a result, the upper and lower arm drive voltages VdH and VdL start to drop.

The control of the control circuit 50 in the external charging state will be described in more detail with reference to FIG. In FIG. 4, (a) shows the state of external charging control, (b) shows transition of the first signal Sg1, (c) shows transition of the second signal Sg2, and (d) shows the transition of the third signal Sg3. , and (e) shows the transitions of the lower arm drive voltage VdL and the short-circuit control threshold Vp.

At time t1, external charging control is performed. Thereby, it is determined that the control system 10 is in the external charging state. In this case, the logic of the first signal Sg1 is switched from L to H. Here, the logic H of the first signal Sg1 indicates that activation of the abnormal power supply 80 is prohibited, and the logic L indicates that activation of the abnormal power supply 80 is permitted.

At time t2 after time t1, the logic of the second signal Sg2 is switched from L to H. Here, the logic H of the second signal Sg2 indicates that activation of the abnormal power supply 80 is prohibited, and the logic L indicates that activation of the abnormal power supply 80 is permitted. Since the logic of the second signal Sg2 is set to H, the short-circuit control threshold value Vp set in the abnormality control section 81 is lowered to 0V.

At time t3 after time t2, the logic of the third signal Sg3 is switched from L to H. The logic H of the third signal Sg3 indicates that the upper and lower arm isolated power supplies 70 and 71 are to be stopped, and the logic L indicates that the operation of the upper and lower arm isolated power supplies 70 and 71 is permitted. When the logic of the third signal Sg3 is set to H, the upper and lower arm insulated power supplies 70 and 71 are stopped. Here, since the lower arm insulated power supply 71 is stopped, the lower arm drive voltage VdL starts to drop. However, since the short-circuit control threshold Vp has been lowered to 0 V, even when the lower arm drive voltage VdL drops to 0 V and the lower arm insulated power supply 71 is stopped, the lower arm drive voltage VdL does not exceed the short-circuit control threshold Vp. never fall below. As a result, activation of the abnormality power supply 80 is not instructed. That is, activation of the abnormality power supply 80 is prohibited.

According to this embodiment detailed above, the following effects can be obtained.

In the configuration in which the abnormality power supply 80 is activated when the lower arm drive voltage VdL drops below the short-circuit control threshold value Vp, the abnormality power supply 80 is stopped before the lower arm drive voltage VdL drops. In this configuration, when it is determined that the battery is in the external charging state, activation of the abnormality power supply 80 is prohibited. As a result, noise sources can be reduced, and noise generated from the control circuit 50 can be reduced.

The configuration is such that the lower arm insulated power supply 71 is stopped when the external charging state is determined. As a result, compared to the case where the lower arm insulated power supply 71 is in operation, noise sources can be reduced, and noise generated from the control circuit 50 can be reduced.

If the lower arm insulated power supply 71 is stopped before the activation of the abnormality power supply 80 is prohibited, the abnormality control unit 81 detects that the lower arm drive voltage VdL has decreased below the short circuit control threshold value Vp. , the abnormal power supply 80 may be activated. In this case, since the abnormal drive voltage Veps for performing the three-phase short-circuit control is generated, noise is generated from the abnormal power supply 80 .

In this regard, in the present embodiment, when the external charging state is determined, the abnormal power supply 80 is started before the third signal Sg3, which is a signal to stop the lower arm insulated power supply 71, is output. A first signal Sg1 for transmitting the prohibition of As a result, activation of the abnormality power supply 80 is prohibited before the lower arm drive voltage VdL drops below the short-circuit control threshold value Vp. Therefore, even if the lower arm drive voltage VdL drops below the short-circuit control threshold value Vp after that, the abnormality power supply 80 is not activated. As a result, the three-phase short-circuit control can be effectively prevented from being performed in the externally charged state, and noise generated from the control circuit 50 can be reduced.

<Modified Example of First Embodiment>
In the first embodiment, when it is determined that the lower arm drive voltage VdL has fallen below the short-circuit control threshold value Vp, the abnormal power supply 80 is activated, but the present invention is not limited to this.

The abnormality control section 81 may instruct the activation of the abnormality power supply 80 at the timing when a predetermined period of time has passed since the detected lower arm drive voltage VdL started to decrease. Here, the predetermined period may be set to a value that allows determination that a sufficient period has elapsed until the upper arm switch SWH is turned off.

In this configuration, when the microcomputer 62 determines that the battery is in the external charging state, the microcomputer 62 may instruct the abnormality time control section 81 to lengthen the predetermined period from before the determination. Specifically, for example, the microcomputer 62 may set the predetermined period to a period longer than the longest period assumed as the period during which the external charging state is performed. Also in this configuration, similarly to the first embodiment, when it is determined that the battery is in the externally charged state, activation of the abnormality power supply 80 is prohibited.

<Second embodiment>
The second embodiment will be described below with reference to the drawings, focusing on differences from the first embodiment. In this embodiment, as shown in FIG. 5, the configuration of the control circuit 50 is partially changed. In addition, in FIG. 5, the same reference numerals are assigned to the configurations shown in FIG. 2 for the sake of convenience.

In the first embodiment, the microcomputer 62 transmits the third signal Sg3 to the upper and lower arm insulated power supplies 70,71. On the other hand, in this embodiment, as shown in FIG. 5, the microcomputer 62 transmits the third signal Sg3 only to the upper arm insulated power supply 70 out of the upper and lower arm insulated power supplies 70 and 71 . The third signal Sg3 is a signal for stopping the upper arm insulated power supply 70 .

In the first embodiment, the control circuit 50 was provided with the determination signal transmission section 74, but in this embodiment, the determination signal transmission section 74 is not provided. Accordingly, in this embodiment, the first and second signals Sg1 and Sg2 used in the first embodiment are not used. Further, in the first embodiment, the short-circuit control threshold Vp is lowered from the preset value to 0 V by setting the logic of the second signal Sg2 to H. However, in the present embodiment, the short-circuit control threshold Vp is , is not changed from the preset value.

Control of the control circuit 50 in the external charging state will be described with reference to FIG. In FIG. 6, (a) shows the state of external charging control, (b) shows the transition of the third signal Sg3, (c) shows the transition of the upper arm drive voltage VdH, and (d) shows the lower arm drive. It shows transitions of the voltage VdL and the short-circuit control threshold Vp.

At time t1, external charging control is performed. Thereby, it is determined that the control system 10 is in the external charging state. In this case, the logic of the third signal Sg3 is switched from L to H. As a result, upper arm insulated power supply 70 is stopped, and upper arm drive voltage VdH begins to drop. On the other hand, since the third signal Sg3 is not transmitted to the lower arm insulated power supply 71, the lower arm insulated power supply 71 is not stopped. Therefore, after time t1, the lower arm drive voltage VdL remains higher than the short-circuit control threshold Vp. As a result, the abnormality power supply 80 is not activated.

According to this embodiment detailed above, the following effects can be obtained.

The microcomputer 62 is configured to stop only the upper arm insulated power supply 70 out of the upper and lower arm insulated power supplies 70 and 71 when determining that it is in the external charging state. Since the three upper arm isolated power supplies 70 are thereby stopped, the number of operating isolated power supplies is reduced compared to the case where the six upper and lower arm isolated power supplies 70 and 71 are operating. As a result, noise sources can be reduced, and noise generated from the control circuit 50 can be reduced.

The noise of the control circuit 50 can be reduced even if the determination signal transmission section 74 is not provided. As a result, the number of parts of the control circuit 50 can be reduced, and the manufacturing cost of the control circuit 50 can be suppressed.

<Third Embodiment>
The third embodiment will be described below with reference to the drawings, focusing on differences from the first embodiment. In this embodiment, as shown in FIG. 7, the configuration of the lower arm insulated power supply 71 is changed. In FIG. 7, the same reference numerals are assigned to the components shown in FIG. 2 for convenience. 7, illustration of the fuse 32, the input circuit 60, and the like is omitted.

The lower arm insulated power supply 71 includes a high voltage side diode 71 a , a high voltage side capacitor 71 b , a transformer 90 and a feedback control section 100 . An electrolytic capacitor, for example, may be used as the high voltage side capacitor 71b.

The transformer 90 includes a primary coil 90a, a secondary coil 90b and a feedback coil 90c. The primary coil 90a, the secondary coil 90b, and the feedback coil 90c are magnetically coupled to each other via a core included in the transformer 90, for example. The transformer 90 supplies the lower arm drive voltage VdL from the low voltage power supply 31 to the configuration of the lower arm driver 73 on the high voltage region side.

A first end of the primary coil 90 a is connected to the positive terminal of the low-voltage power supply 31 . The feedback control section 100 has a voltage control switch 101 . In this embodiment, an N-channel MOSFET is used as the voltage control switch 101 . A second end of the primary coil 90 a is connected to the drain of the voltage control switch 101 . The source of the voltage control switch 101 is connected to the ground. That is, the positive terminal of the low-voltage power supply 31 is connected to the negative terminal of the low-voltage power supply 31 via the primary coil 90 a and the voltage control switch 101 . That is, the voltage control switch 101 is provided so as to be able to form a closed circuit including the low-voltage power supply 31, the primary coil 90a, and the voltage control switch 101 by turning on the voltage control switch 101 itself.

The secondary coil 90b is connected to the high voltage region side configuration of the lower arm driver 73 via the high voltage side diode 71a and the high voltage side capacitor 71b. A first end of the secondary coil 90b is connected to the anode of the high voltage diode 71a. A cathode of the high voltage side diode 71a is connected to a first terminal provided on the high voltage region side of the lower arm driver 73 . A second end of the secondary coil 90b is connected to a second terminal provided on the high voltage region side of the lower arm driver 73 . A first end of the high voltage side capacitor 71 b is connected to the high voltage side diode 71 a and a first terminal of the lower arm driver 73 . A second end of the high voltage side capacitor 71 b is connected to a second end of the secondary side coil 90 b and a second terminal of the lower arm driver 73 .

The feedback coil 90 c is connected to a feedback circuit 102 provided in the feedback control section 100 . Specifically, the feedback circuit 102 includes a sensing diode 102a, a sensing capacitor 102b, a first resistor 102c and a second resistor 102d. A first end of the feedback coil 90c is connected to the anode of the detection diode 102a. A second end of the feedback coil 90c is connected to ground. The detection capacitor 102b connects the cathode of the detection diode 102a, the second end of the feedback coil 90c, and the ground. The cathode of the detection diode 102a is connected to the first end of the first resistor 102c. A second end of the first resistor 102c is connected to a first end of the second resistor 102d. A second end of the second resistor 102d is connected to the ground.

The feedback control unit 100 has a power supply IC 103 . A detection terminal Tfb provided in the power supply IC 103 is connected between the second end of the first resistor 102c and the first end of the second resistor 102d. The feedback circuit 102 has a so-called rectifying function of converting the output voltage of the feedback coil 90c into a DC voltage. After passing through the detection diode 102a, the output voltage of the feedback coil 90c is divided by the first resistor 102c and the second resistor 102d. A voltage divided by the first resistor 102c and the second resistor 102d (hereinafter referred to as feedback voltage Vfb) is input to the power supply IC 103 via the detection terminal Tfb of the power supply IC 103 .

Here, the first resistor 102c and the second resistor 102d are variable resistors, and their resistance values can be changed by a signal from the power supply IC 103 indicating that the resistance value should be changed. Thereby, the feedback voltage Vfb is also changeable.

A power terminal TVc of the power IC 103 is connected to the positive terminal of the low-voltage power supply 31 . The power supply IC 103 is configured to be operable by power supply from the low-voltage power supply 31 . The operation terminal of the power supply IC 103 is connected to the gate of the voltage control switch 101, and the voltage control switch 101 is turned on and off in order to feedback-control the feedback voltage Vfb to the target voltage Vtgt of the lower arm drive voltage VdL. .

The power supply IC 103 is configured to communicate with the microcomputer 62 . When the microcomputer 62 determines that it is in the external charging state, the microcomputer 62 transmits a signal to the effect that the feedback voltage Vfb is to be changed to the power supply IC 103 . Specifically, the microcomputer 62 transmits a signal for increasing the feedback voltage Vfb to the power supply IC 103 .

Control of the control circuit 50 in the external charging state will be described with reference to FIG. In FIG. 8, (a) shows the state of the external charging control of the control system 10, (b) shows transition of the feedback voltage Vfb, and (c) shows transition of the lower arm drive voltage VdL.

At time t1, external charging control is performed. Thereby, it is determined that the control system 10 is in the external charging state. In this case, a signal to change the feedback voltage Vfb is transmitted from the microcomputer 62 to the power supply IC 103, and the resistance values of the first resistor 102c and the second resistor 102d are changed. Specifically, the resistance value of the first resistor 102c is increased, and the resistance value of the second resistor 102d is decreased. Alternatively, these operations may be combined. These increase the feedback voltage Vfb. The power supply IC 103 turns on and off the voltage control switch 101 to reduce the increased feedback voltage Vfb to the target voltage Vtgt. As a result, the lower arm drive voltage VdL, which is the terminal voltage of the secondary coil 90b, decreases.

By changing the resistance value, the lower arm drive voltage VdL is changed to a voltage higher than the short-circuit control threshold Vp and lower than the low voltage threshold VUVLO. The low voltage threshold VUVLO is provided to avoid malfunction of the isolated power supplies 70 and 71 when the drive voltages VdH and VdL are less than the low voltage threshold VUVLO. Note that in the present embodiment, the low voltage threshold VUVLO corresponds to the "driving voltage".

According to this embodiment detailed above, the following effects can be obtained.

When the external charging state is determined, the resistance value of at least one of the first and second resistors 102c and 102d is changed so that the lower arm drive voltage VdL is higher and lower than the short-circuit control threshold Vp. The configuration is such that the voltage is changed to less than the voltage threshold VUVLO. With this configuration, the power consumption of the lower arm insulated power supply 71 is reduced more than when the lower arm drive voltage VdL is equal to or higher than the low voltage threshold VUVLO. Therefore, noise generated from the lower arm insulated power supply 71 is reduced. As a result, noise generated from the control circuit 50 can be reduced.

<Fourth Embodiment>
The fourth embodiment will be described below with reference to the drawings, focusing on differences from the third embodiment. In this embodiment, the switching frequency fr of the voltage control switch 101 is changed.

The switching frequency fr of the voltage control switch 101 depends on conditions such as the efficiency and control accuracy of the power supplied by each of the insulated power supplies 70 and 71 when performing normal drive control, and the cost of inductor components possessed by each of the insulated power supplies 70 and 71. is set in consideration of More specifically, the higher the switching frequency fr, the higher the efficiency and control accuracy of power supply, and the lower the cost of inductor components. However, it is known that the higher the switching frequency fr, the greater the noise generated from each of the insulated power supplies 70 and 71 .

By the way, when it is determined that the external charging state is set, the switches SWH and SWL provided in the inverter 13 are turned off, and normal drive control is not performed. Therefore, the switching frequency fr of the voltage control switch 101 is allowed to be reduced compared to when the normal drive control is performed.

Therefore, in the present embodiment, as shown in FIG. 9, the switching frequency fr of the voltage control switch 101 in the external charging state is changed.

Control in the external charging state will be described with reference to FIG. This control is repeatedly executed at a predetermined cycle.

In step S20, the microcomputer 62 determines whether the control system 10 is in the external charging state. When the microcomputer 62 determines that the control system 10 is not in the external charging state, the process proceeds to step S21 and transmits a signal to the effect that the external charging state is not in the power supply IC 103 . As a result, the power supply IC 103 sets the switching frequency fr of the voltage control switch 101 to the first switching frequency fa. Here, the first switching frequency fa is a switching frequency used when performing normal drive control. On the other hand, when the microcomputer 62 determines that it is in the external charging state, it proceeds to step S22 and transmits a signal to the effect that it is in the external charging state to the power supply IC 103 . As a result, the power supply IC 103 sets the switching frequency fr of the voltage control switch 101 to the second switching frequency fb. Here, the second switching frequency fb is a switching frequency lower than the first switching frequency fa.

According to this embodiment detailed above, the following effects can be obtained.

The switching frequency fr of the voltage control switch 101 is set to a second switching frequency fb that is lower than the first switching frequency fa when the external charging state is determined. As a result, the switching frequency fr of the voltage control switch 101 is reduced more than when normal drive control is performed. Therefore, noise generated from each of the insulated power supplies 70 and 71 is reduced. As a result, noise generated from the control circuit 50 can be reduced.

<Modification of Fourth Embodiment>
The second switching frequency fb is not limited to a switching frequency lower than the first switching frequency fa, and may be a switching frequency higher than the first switching frequency fa. As an example, the switching frequency of the isolated power supply may be higher than the frequency of other power supplies in the control circuit. Specifically, a case where the control system includes two rotating electric machines and an inverter having a switching device section corresponding to each rotating electric machine will be described. The inverter has a first switching device portion and a second switching device portion. A first rotating electrical machine is connected to the first switching device section, and a second rotating electrical machine is connected to the second switching device section. The control circuit 50 includes a first insulated power supply that supplies power to the upper and lower arm switches forming the first switching device section, and a second insulated power supply that supplies power to the upper and lower arm switches forming the second switching device section. with power supply.

In this configuration, when the external charging state is determined, the switching frequency of the first insulated power supply is controlled to the first switching frequency fa, and the switching frequency of the second insulated power supply is controlled to the second switching frequency fb. Here, the second switching frequency fb is a switching frequency higher than the first switching frequency fa. In this case, since the switching frequencies of the two first and second insulated power supplies are shifted, noise generated from the control circuit 50 can be reduced.

<Fifth Embodiment>
The fifth embodiment will be described below with reference to the drawings, focusing on differences from the first embodiment. In this embodiment, part of the configuration is changed so that the abnormality power supply 80 always starts up. In addition, in FIG. 10, the same reference numerals are assigned to the configurations shown in FIG. 2 for the sake of convenience.

In the high voltage region of the control circuit 50, a first regulating diode 110 is provided in the gate charging path connecting the lower arm driver 73 and the gate of the lower arm switch SWL. The first regulating diode 110 is provided with its anode connected to the lower arm driver 73 . In FIG. 10, illustration of the gate discharge path of the lower arm switch SWL is omitted.

The control circuit 50 includes an abnormality switch 111 , an abnormality path 112 and a second regulating diode 113 . The abnormality path 112 connects the output side of the abnormality power supply 80 and the gate of the lower arm switch SWL. The abnormality path 112 is provided with an abnormality switch 111 and a second regulating diode 113 in order from the output side of the abnormality power supply 80 . The second regulating diode 113 is provided with its anode connected to the abnormality switch 111 side. The second regulating diode 113 prevents the charging current output from the lower arm driver 73 to the gate of the lower arm switch SWL from flowing to the abnormality switch 111 side. In this embodiment, the abnormality switch 111 corresponds to the "shutoff switch" and the abnormality path 112 corresponds to the "power supply path".

The abnormality power supply 80 includes a power supply control section 80a. The power supply control unit 80a is supplied with the output voltage VH of the smoothing capacitor 24, and the input voltage of the power supply control unit 80a starts to rise and before the input voltage reaches the output voltage VH of the smoothing capacitor 24. The abnormal power supply 80 is activated at the timing when the input voltage reaches the specified voltage. In the present embodiment, activation of the abnormal power supply 80 means that the power control unit 80a starts controlling the abnormal drive voltage Veps to the target value. By starting this control, the abnormality drive voltage Veps starts rising toward the target value. By activating the abnormality power supply 80 at the timing when the specified voltage is reached, the abnormality drive voltage Veps of the abnormality power supply 80 is brought into a controllable state at an early stage. In this embodiment, this state is defined as a state in which the abnormal power supply 80 is always activated. It should be noted that in the present embodiment, the specified voltage is set as the starting voltage of the power supply control section 80a.

When the abnormality control unit 81 determines that the lower arm drive voltage VdL has fallen below the short-circuit control threshold value Vp, it turns on the abnormality switch 111 . Thereby, three-phase short-circuit control is performed.

When it is determined that the control system 10 is in the external charging state, the first signal Sg1 is transmitted from the microcomputer 62 to the abnormality control section 81 via the determination signal transmission section 74 . The first signal Sg1 of the present embodiment is a signal that includes at least one of stopping the abnormality power supply 80 and turning off the abnormality switch 111 . In the present embodiment, the first signal Sg1 is a signal indicating that the abnormality power supply 80 is stopped and that the abnormality switch 111 is turned off. When the first signal Sg1 is input to the abnormality control section 81, the abnormality control section 81 transmits the second signal Sg2 to the power control section 80a. The second signal Sg2 of the present embodiment is a signal indicating that the abnormality power supply 80 should be stopped. Further, when the first signal Sg1 is input to the abnormality control section 81, the abnormality control section 81 turns off the abnormality switch 111. FIG.

After that, the third signal Sg3 is transmitted from the microcomputer 62 to the upper and lower arm insulated power supplies 70 and 71. FIG. As a result, the upper and lower arm insulated power supplies 70 and 71 are stopped.

According to this embodiment detailed above, the following effects can be obtained.

The abnormal power supply 80 is activated at the timing when the input voltage of the abnormal power supply 80 reaches the specified voltage. In this configuration, the microcomputer 62 is configured to stop the insulated power supply when it determines that the external charging state is set. As a result, noise sources can be reduced, and noise generated from the control circuit 50 can be reduced.

The microcomputer 62 is configured to stop the abnormality power supply 80 when it determines that the external charging state is set. As a result, noise sources can be reduced, and noise generated from the control circuit 50 can be reduced.

The microcomputer 62 is configured to turn off the abnormality switch 111 when it determines that the battery is in the external charging state. As a result, the abnormality path 112 is cut off, so that the power generated by the abnormality power supply 80 is no longer supplied to the gate of the lower arm switch SWL. In this case, since the abnormality power supply 80 cannot pass current through the abnormality path 112, the power consumption of the abnormality power supply 80 is lower than the power consumption when the three-phase short-circuit control is performed. Therefore, the noise generated from the abnormality power supply 80 is reduced more than when the short-circuit control is performed. As a result, noise generated from the control circuit 50 can be reduced.

<Modified example of the fifth embodiment>
The control circuit 50 is not limited to a configuration in which the power generated by the abnormality power supply 80 is directly supplied to the lower arm switch SWL.

The power generated by the abnormality power supply 80 may be supplied to the structure on the high voltage region side of the lower arm driver 73 . Specifically, the abnormality path 112 may connect the output side of the abnormality power supply 80 and the configuration of the lower arm driver 73 on the high voltage region side. When the abnormality control unit 81 determines that the lower arm drive voltage VdL has fallen below the short-circuit control threshold value Vp, it turns on the abnormality switch 111 . As a result, power is supplied from the abnormality power supply 80 to the lower arm driver 73, and the three-phase short-circuit control is performed. Also in this embodiment, the same effects as in the fifth embodiment can be obtained.

<Other embodiments>
It should be noted that each of the above-described embodiments may be modified as follows.

- As the three-phase short-circuit control, the control of switching the upper arm switches SWH for three phases to the ON state and switching the lower arm switches SWL for the three phases to the OFF state may be performed.

- In the second embodiment, the third signal Sg3 is a signal indicating that the upper arm insulated power supply 70 is to be stopped. It may be a signal indicating that it will be reduced below the threshold value VUVLO. In this configuration, when the external charging state is determined, power consumption of upper arm insulated power supply 70 is reduced, so that noise generated from upper arm insulated power supply 70 is reduced. As a result, noise generated from the control circuit 50 can be reduced.

- In the second embodiment, the lower arm insulated power supply 71 is individually provided corresponding to each phase of the lower arm driver 73. A lower arm insulated power supply 71 may be provided. In this configuration, when the external charging state is determined, the number of insulated power supplies in operation is one of the common lower arm insulated power supplies 71 . Therefore, the noise generated from the lower arm insulated power supply 71 is reduced compared to the second embodiment in which the number of operating insulated power supplies is three, the lower arm insulated power supply 71 provided individually for each phase. . As a result, noise sources can be reduced, and noise in the control circuit 50 can be reduced.

- In the third embodiment, when the external charging state is determined, the feedback voltage Vfb is changed. However, this may be changed to change the target voltage Vtgt. Specifically, when the external charging state is determined, the power supply IC 103 reduces the target voltage Vtgt. As a result, the power supply IC 103 turns on and off the voltage control switch 101 in order to reduce the feedback voltage Vfb to its target voltage Vtgt. As a result, the lower arm drive voltage VdL, which is the terminal voltage of the secondary coil 90b, is reduced.

- In the fifth embodiment, when it is determined that the battery is in the external charging state, the first signal Sg1 may be output before the third signal Sg3 is output. As a result, the abnormality power supply 80 is stopped and the abnormality switch 111 is turned off before the lower arm drive voltage VdL drops below the short-circuit control threshold value Vp. Therefore, even if the lower arm drive voltage VdL drops below the short-circuit control threshold value Vp after that, the power generated by the abnormality power supply 80 is not supplied to the gate of the lower arm switch SWL. As a result, the three-phase short-circuit control can be effectively prevented from being performed in the externally charged state, and noise generated from the control circuit 50 can be reduced.

- The charging device 40 shown in FIG. 1 may be provided outside the control system 10 .

- As the upper and lower arm drivers 72 and 73, drivers provided only in the high pressure region without straddling the boundary between the low pressure region and the high pressure region may be used.

- The switches SWH and SWL constituting the switching device section 20 are not limited to IGBTs, and may be N-channel MOSFETs incorporating body diodes, for example.

- The control amount of the rotary electric machine 11 is not limited to the torque, and may be, for example, the rotation speed of the rotor of the rotary electric machine 11 .

- The rotary electric machine 11 is not limited to a permanent magnet synchronous machine, and may be, for example, a winding field synchronous machine. Further, the rotary electric machine 11 is not limited to a synchronous machine, and may be an induction machine, for example. Furthermore, the rotary electric machine 11 is not limited to one used as a vehicle-mounted main engine, and may be one used for other purposes such as an electric power steering device or an electric motor constituting an electric compressor for air conditioning.

- The controller and techniques described in this disclosure can be performed by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program; may be implemented. Alternatively, the controls and techniques described in this disclosure may be implemented by a dedicated computer provided by configuring the processor with one or more dedicated hardware logic circuits. Alternatively, the control units and techniques described in this disclosure can be implemented by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. It may also be implemented by one or more dedicated computers configured. The computer program may also be stored as computer-executable instructions on a computer-readable non-transitional tangible recording medium.

DESCRIPTION OF SYMBOLS 10... Control system, 13... Inverter, 30... High-voltage power supply, 31... Low-voltage power supply, 40... Charging device, 11... Rotary electrical machine, 12... Winding, SWH, SWL... Upper and lower arm switches, 50... Control circuit, 62 Microcomputer 70, 71 Upper and lower arm insulated power supply 72, 73 Upper and lower arm driver 80 Abnormal power supply 81 Abnormal control unit.

Claims (12)

a low-voltage power storage unit (31) provided in a low-voltage region;
a high voltage storage unit (30) provided in a high voltage region electrically insulated from the low voltage region;
a multiphase rotating electric machine (11);
A power conversion applied to a system (10) comprising a power converter (13) having upper and lower arm switches (SWH, SWL) electrically connected to each phase winding (12) of the rotating electric machine. In the control circuit (50) of the device,
an insulated power supply (70, 71) provided in the low-voltage area and the high-voltage area across the boundary between the low-voltage area and the high-voltage area, and configured to generate electric power by being fed from the low-voltage storage unit;
an abnormality power supply (80) that generates electric power by receiving power from the high voltage storage unit;
The output voltage of the insulated power supply is detected, and after the detected output voltage starts to drop, the power generated by the abnormal power supply is used to turn on the switch in either one of the upper and lower arms. , an abnormality control unit (81) that performs short-circuit control to turn off the switch in the other arm;
a state determination unit (62) that determines an external charging state in which power is supplied from the charging device (40) to the high-voltage storage unit and the switches in the upper and lower arms are turned off;
The state determination unit prohibits supply of power generated by the abnormality power supply to the gate of the switch that is turned on by the short-circuit control when determining that the state is the external charging state, or prohibits the external charging state. A control circuit for a power converter that reduces the power generated by the abnormality power supply before it is determined to be in a charged state. The abnormality control unit detects an output voltage of the insulated power supply, and activates the abnormality power supply after the detected output voltage starts to decrease,
When the state determination unit determines that the state is the external charging state, the state determination unit prohibits the abnormality control unit from starting the abnormality power supply, so that the power generated by the abnormality power supply is controlled by the short-circuit control. 2. The control circuit for a power converter according to claim 1, wherein the power supply to the gate of the switch that is turned on by is inhibited. 3. The power converter control circuit according to claim 2, wherein the state determination unit stops the insulated power supply when determining that the state is the external charging state. When the state determination unit determines that the state is the external charging state, the power generated by the abnormality power supply is supplied to the gate of the switch that is turned on by the short-circuit control before stopping the insulated power supply. 4. The power converter control circuit according to claim 3, which prohibits A plurality of the insulated power supplies are provided,
The abnormality time control unit detects an output voltage of a part of the plurality of insulated power supplies, and activates the abnormality power supply after the detected output voltage starts to decrease,
3. The power converter according to claim 2, wherein, when determining that the state is the external charging state, the state determination unit stops an insulated power supply whose output voltage is not detected by the abnormal time control unit among the plurality of insulated power sources. control circuit. a switch drive unit (72, 73) provided in the high voltage region, which becomes operable when the voltage supplied from the insulated power supply becomes equal to or higher than the drive voltage, and drives the switches of the upper and lower arms;
The abnormality control unit instructs the switch driving unit to execute the short-circuit control,
A plurality of the insulated power supplies are provided,
The abnormality time control unit detects an output voltage of a part of the plurality of insulated power supplies, and activates the abnormality power supply after the detected output voltage starts to decrease,
When the state determination unit determines that the state is the external charging state, the state determination unit reduces the output voltage of an insulated power supply whose output voltage is not detected by the abnormal time control unit, among the plurality of insulated power sources, to be lower than the drive voltage. 3. A power converter control circuit according to item 2. a switch drive unit (72, 73) provided in the high voltage region, which becomes operable when the voltage supplied from the insulated power supply becomes equal to or higher than the drive voltage, and drives the switches of the upper and lower arms;
When the output voltage of the insulated power supply becomes equal to or less than a threshold, the abnormality control unit instructs the switch driving unit to perform the short-circuit control,
3. The power according to claim 2, wherein the state determination unit changes the output voltage of the insulated power supply to a voltage higher than the threshold and less than the drive voltage when determining that the state is the external charging state. Converter control circuit. When the state determination unit determines that the state is the external charging state, the switching frequency of the insulated power supply is set to the switching frequency of the insulated power supply when normal drive control is performed to alternately turn on the switches in the upper and lower arms. The power converter control circuit according to any one of claims 5 to 7, wherein: The power supply for abnormality has a power control unit (80a) that is a control unit that controls the power supply for abnormality and is operable by being supplied with power from the high voltage storage unit,
The power supply control unit controls the power supply control unit so that the input voltage reaches a specified voltage during a period from when the input voltage starts to rise due to power supply from the high voltage storage unit to before the input voltage reaches the voltage of the high voltage storage unit. Start the power supply for abnormality at the timing of reaching
2. The power converter control circuit according to claim 1, wherein said state determination unit further stops said insulated power supply when determining that said external charging state is established. 10. The power converter control circuit according to claim 9, wherein the state determination unit stops the abnormality power source when determining that the state is the external charging state. an electrical path (112) for supplying power generated by the abnormal power supply to the gate of the switch that is turned on by the short circuit control;
A cut-off switch (111) provided in the electrical path,
11. The power converter control circuit according to claim 9, wherein the state determination unit turns off the cut-off switch when determining that the state is the external charging state. 12. The power according to any one of claims 9 to 11, wherein the state determination unit reduces generated power of the abnormality power supply prior to stopping the insulated power supply when determining that the state is the external charging state. Converter control circuit.

Images