JP7745480B2 - Power System - Google Patents

Description

The present invention relates to a power supply system installed in an electric vehicle or the like.

In recent years, efforts to reduce CO2 emissions and improve energy efficiency have become more active in order to realize a low-carbon or carbon-free society. Accordingly, the electrification of various devices, including vehicles, is progressing, and research and development of power supply systems for electrifying various devices, including vehicles, is being actively conducted.

Ensuring electrical safety is important in this type of power supply system. For example, Patent Document 1 describes a power supply system that can reliably cut off current to an electric heater in the event of an abnormality.

JP 2015-045498 A

However, with the power supply system of Patent Document 1, if an IGBT short-circuits and the user turns the power supply system off before the electric heater reaches a predetermined temperature, and the bimetal switch does not perform a shut-off operation and the power supply system remains off, the next time the user turns the power supply system on, power may be unintentionally supplied to the short-circuited electric heater.

The present invention provides a power supply system that contributes to reducing CO2 emissions and improving energy efficiency, and that can prevent the contactor from switching from a disconnected state to a connected state when a switching element has a short-circuit fault, thereby preventing power from being unintentionally supplied to a load.

The present invention provides
Power supply and
a load that operates using power supplied from the power source;
a contactor capable of electrically connecting and disconnecting the power supply and the load by switching between a connected state and a disconnected state;
a switching element for controlling the power supplied to the load;
a cutoff device that operates to cut off power supply to the load when the temperature of the load reaches or exceeds a predetermined temperature;
a control device capable of switching the contactor between a connected state and a disconnected state,
The control device
If the switching element has a short circuit fault,
The contactor is controlled to maintain the connected state until the interrupter operates.

This invention prevents the contactor from switching from a disconnected state to a connected state when a switching element has a short-circuit fault, thereby preventing power from being unintentionally supplied to the load.

1 is a schematic configuration diagram of a power supply system according to an embodiment of the present invention; 2 is a flowchart showing the operation of the power supply system of FIG. 1 .

One embodiment of the power supply system of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction indicated by the reference numerals. The power supply system of this embodiment is installed in a vehicle.

<Power supply system configuration>
First, the configuration of a power supply system 1 according to an embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, the power supply system 1 includes a high-voltage circuit 10, a low-voltage circuit 20, and a DC-DC converter 30 that connects the high-voltage circuit 10 and the low-voltage circuit 20 and is capable of stepping down the power flowing through the high-voltage circuit 10 and supplying it to the low-voltage circuit 20.

The high-voltage circuit 10 is electrically connected to the high-voltage battery BAT-H installed in the vehicle and a battery heater 40 that heats the high-voltage battery BAT-H.

The high-voltage battery BAT-H is a secondary battery that can be repeatedly charged and discharged, such as a lithium-ion battery. In this embodiment, the output voltage of the high-voltage battery BAT-H is 400 V.

The battery heater 40 includes a heating element 41, a switching element 42, and a circuit breaker 43. In the battery heater 40, the heating element 41, the switching element 42, and the circuit breaker 43 are connected in series.

The heating element 41 is, for example, a heating resistor, ceramic heater, induction heater, etc., and is a load with a predetermined electrical resistance value.

The switching element 42 controls the power supplied to the heating element 41. In this embodiment, the switching element 42 is an IGBT (Insulated Gate Bipolar Transistor). The switching element 42 has a gate electrode 42a that is electrically connected to a gate driver 83 that is connected to the low-voltage circuit 20. When a control current is supplied from the gate driver 83 to the gate electrode 42a, the switching element 42 is in a connected state, and power is supplied to the heating element 41. On the other hand, when a control current is not supplied from the gate driver 83 to the gate electrode 42a, the switching element 42 is in a cut-off state, and the power supply to the heating element 41 is cut off.

The interrupter device 43 operates to cut off the power supply to the heating element 41 when the temperature of the heating element 41 reaches or exceeds a predetermined temperature T0. In this embodiment, the interrupter device 43 is a bimetal switch. The bimetal switch interrupter device 43 is a normally closed switch that is normally in an energized state. When the temperature of the heating element 41 reaches or exceeds the predetermined temperature T0, the bimetal disc of the interrupter device 43 operates, driving the rod to enter an interrupted state and cutting off the power supply to the heating element 41. The interrupter device 43 may also be a thermal fuse that cuts off the power supply to the heating element 41 when the temperature of the heating element 41 reaches or exceeds the predetermined temperature T0.

The switching element 42 and the interrupter 43 may be arranged on either the high-potential side or the low-potential side of the heating element 41. In this embodiment, the switching element 42 is arranged on the low-potential side of the heating element 41, and the interrupter 43 is arranged on the high-potential side of the heating element 41.

The high-voltage circuit 10 is provided with a main contactor 51 that is connected in series with the battery heater 40 and can be switched between a connected state and a disconnected state.

The main contactor 51 is provided between the high-potential side of the high-voltage battery BAT-H in the high-voltage circuit 10 and the battery heater 40. The main contactor 51 is switched between a connected state and a disconnected state by a first switch driver 81 connected to the low-voltage circuit 20. When the main contactor 51 is in the connected state, the high-voltage battery BAT-H and the battery heater 40 are electrically connected.

In this embodiment, a first high-voltage power line 11 is connected to the high-voltage circuit 10. One end 11a of the first high-voltage power line 11 is connected between the high-potential side of the high-voltage battery BAT-H and the main contactor 51 in the high-voltage circuit 10, and the other end 11b of the first high-voltage power line 11 is connected between the main contactor 51 and the battery heater 40 in the high-voltage circuit 10.

A precharge contactor 52 is provided on the first high-voltage power line 11. Therefore, the precharge contactor 52 is connected in parallel with the main contactor 51.

The precharge contactor 52 has a contactor portion 52a that can be switched between a connected state and a disconnected state by a second switch driver 82 connected to the low-voltage circuit 20, and a precharge resistor portion 52b that is an electrical resistor.

In this embodiment, a second high-voltage power line 12 is connected to the high-voltage circuit 10. One end 12a of the second high-voltage power line 12 is connected between the other end 11b of the first high-voltage power line 11 and the battery heater 40 in the high-voltage circuit 10, and the other end 12b of the second high-voltage power line 12 is connected between the battery heater 40 and the low-potential side of the high-voltage battery BAT-H in the high-voltage circuit 10.

A capacitor CP is provided on the second high-voltage power line 12. Therefore, the capacitor CP is connected in series with the main contactor 51 in the high-voltage circuit 10 and in parallel with the battery heater 40.

The capacitor CP is an element that can store and discharge power as electrostatic energy. In this embodiment, the capacitor CP is a capacitor.

If the capacitor CP is not provided, when the power supply system 1 transitions from the off state to the on state and the main contactor 51 is accordingly switched from the disconnected state to the connected state, high-voltage, large-current power from the high-voltage battery BAT-H would rush into the main contactor 51, potentially damaging the main contactor 51. Therefore, as described above, the pre-charge contactor 52 and capacitor CP are provided, and when the power supply system 1 transitions from the off state to the on state, the pre-charge contactor 52 is first switched from the disconnected state to the connected state while the main contactor 51 remains disconnected. Then, power is stored in the capacitor CP while the amount of current output from the high-voltage battery BAT-H is adjusted by the pre-charge resistor 52b of the pre-charge contactor 52. When a predetermined amount of power is stored in the capacitor CP, the potential difference between the high-potential side and low-potential side of the main contactor 51 becomes small. Therefore, by switching the main contactor 51 from a disconnected state to a connected state after a predetermined amount of power has been stored in the capacitor CP, damage to the main contactor 51 can be prevented.

In this embodiment, a third high-voltage power line 13 is connected to the high-voltage circuit 10. One end 13a of the third high-voltage power line 13 is connected between one end 11a of the second high-voltage power line 12 and the battery heater 40 in the high-voltage circuit 10, and the other end 13b of the third high-voltage power line 13 is connected between the battery heater 40 and the other end 12b of the second high-voltage power line 12 in the high-voltage circuit 10.

An air conditioning heater 61 is provided on the third high-voltage power line 13. Therefore, the air conditioning heater 61 is connected in parallel with the battery heater 40 and the capacitor CP in the high-voltage circuit 10.

The air conditioning heater 61 is a load in an air conditioning system (not shown) installed in the vehicle that heats the air supplied to the vehicle cabin.

The low-voltage circuit 20 is connected to the vehicle's low-voltage battery BAT-L and the control unit ECU. The system power switch PWR is connected to the control unit ECU.

The low-voltage battery BAT-L is a secondary battery that can be repeatedly charged and discharged, such as a lithium-ion battery or a lead-acid battery. In this embodiment, the output voltage of the low-voltage battery BAT-L is 12 V.

The system power switch PWR is an operating unit mounted on the vehicle that can switch the power supply system 1 between an on state and an off state. The system power switch PWR can be turned on and off by the user. The user is, for example, a passenger in the vehicle equipped with the power supply system 1. Here, the on state of the power supply system 1 refers to a state in which the system power switch PWR is turned on, the vehicle's drive source is activated, and the power necessary to drive the vehicle is being supplied to the auxiliary equipment required for driving, and refers to a state in which the vehicle is running or can be run immediately. Furthermore, the off state of the power supply system 1 refers to a state in which the system power switch PWR is turned off, the vehicle's drive source is not activated, and the power necessary to drive the vehicle is not being supplied to the auxiliary equipment required for driving.

The low-voltage circuit 20 has a first contact 20a formed between the control device ECU and the high-potential side of the low-voltage battery BAT-L, and a second contact 20b formed between the control device ECU and the low-potential side of the low-voltage battery BAT-L.

Furthermore, the low-voltage circuit 20 is connected to a first low-voltage power line 21 provided with a first switch driver 81, a second low-voltage power line 22 provided with a second switch driver 82, a third low-voltage power line 23 provided with a gate driver 83, and a fourth low-voltage power line 24 provided with a battery heater cooling device 90. One end of the first low-voltage power line 21, the second low-voltage power line 22, the third low-voltage power line 23, and the fourth low-voltage power line 24 are all connected to the first contact 20a and the other end is connected to the second contact 20b.

Therefore, in the low-voltage circuit 20, the control device ECU, the first switch driver 81, the second switch driver 82, the gate driver 83, and the battery heater cooling device 90 are connected in parallel with each other.

The control device ECU is capable of controlling the first switch driver 81, the second switch driver 82, the gate driver 83, and the battery heater cooling device 90. Furthermore, the control device ECU is capable of controlling the DC-DC converter 30 and the air conditioning heater 61. The control device ECU also includes a storage medium M capable of storing various types of information.

As described above, the first switch driver 81 is controlled by the control unit ECU and is capable of supplying a control current to the main contactor 51. The main contactor 51 is then switched between a connected state and a disconnected state based on the control current supplied from the first switch driver 81. Therefore, the control unit ECU can control the main contactor 51 to switch between a connected state and a disconnected state via the first switch driver 81.

As described above, the second switch driver 82 is controlled by the control device ECU and is capable of supplying a control current to the contactor portion 52a of the precharge contactor 52. The contactor portion 52a of the precharge contactor 52 is switched between a connected state and a disconnected state based on the control current supplied from the second switch driver 82. Therefore, the control device ECU can control the switching of the precharge contactor 52 between a connected state and a disconnected state via the second switch driver 82.

As mentioned above, the gate driver 83 is controlled by the control unit ECU and is capable of supplying a control current to the gate electrode 42a of the switching element 42. The switching element 42 is then switched between a connected state and a disconnected state based on the control current supplied from the gate driver 83 to the gate electrode 42a. Therefore, the control unit ECU can control the switching element 42 to switch between a connected state and a disconnected state via the gate driver 83.

The battery heater cooling device 90 is a device that cools the battery heater 40. The battery heater cooling device 90 is a device that cools the battery heater 40 by, for example, circulating a refrigerant and exchanging heat between the refrigerant and the battery heater 40. The control device ECU is capable of controlling the battery heater 40.

The DC-DC converter 30 is provided on the step-up/step-down power line 31. One end 31a of the step-up/step-down power line 31 is connected between one end 12a of the second high-voltage power line 12 and one end 13a of the third high-voltage power line 13 in the high-voltage circuit 10. The other end 31b of the step-up/step-down power line 31 is connected to the first contact 20a in the low-voltage circuit 20. The DC-DC converter 30 is capable of stepping down the power flowing through the high-voltage circuit 10 and supplying it to the low-voltage circuit 20 from the first contact 20a of the low-voltage circuit 20.

<Power supply system operation>
Next, the operation of power supply system 1 will be described with reference to FIG.

First, the control device ECU determines whether the switching element 42 has a short-circuit fault (step S101). For example, the control device ECU is connected to a sensor (not shown) that can detect whether the switching element 42 has a short-circuit fault. The sensor outputs an electrical signal indicating whether the switching element 42 has a short-circuit fault. The control device ECU determines whether the switching element 42 has a short-circuit fault based on the electrical signal output from the sensor. A short-circuit fault is a fault that causes the switching element 42 to become conductive. Short-circuit faults include, for example, a fault in which the gate electrode 42a of the switching element 42 remains stuck while the switching element 42 remains connected. In this way, the gate electrode 42a of the switching element 42 remains stuck while the switching element 42 remains connected, which is also referred to as a stuck-on fault.

If the control unit ECU determines in step S101 that the switching element 42 has a short-circuit fault (step S101: YES), the process proceeds to step S201. On the other hand, if the control unit ECU determines that the switching element 42 has not a short-circuit fault (step S101: NO), the process proceeds to step S102.

In step S102, the control device ECU determines whether the user has turned off the system power switch PWR. If the control device ECU determines in step S102 that the user has not turned off the system power switch PWR, it returns to step S101 (step S102: NO). If the control device ECU determines that the user has turned off the system power switch PWR (step S102: YES), it proceeds to step S501.

In step S501, the control unit ECU switches the main contactor 51 from the connected state to the disconnected state, ending the series of operations.

On the other hand, in step S201, the control unit ECU stores information indicating that the switching element 42 has a short-circuit fault in the storage medium M. Then, the process proceeds to step S202.

In step S202, the control device ECU notifies the user of information indicating that the battery heater 40 needs to be replaced. For example, the control device ECU is connected to a warning light that turns on when the battery heater 40 needs to be replaced, and the control device ECU turns on the warning light in step S202. Also, for example, the control device ECU is connected to a display device such as an LCD panel that can display various information, and in step S202, the control device ECU displays information indicating that the battery heater 40 needs to be replaced on the display device. Then, the process proceeds to step S203.

In step S203, the control unit ECU initiates cooling suppression control, which controls the battery heater cooling device 90 to suppress cooling of the heat-generating element 41 of the battery heater 40. More specifically, the cooling suppression control controls the battery heater cooling device 90 so that the temperature of the heat-generating element 41 of the battery heater 40 is equal to or higher than a predetermined temperature T0 and lower than an upper limit temperature Tmax that is higher than the predetermined temperature T0. Then, the process proceeds to step S204.

In this way, if the switching element 42 has a short-circuit fault, the control unit ECU initiates cooling suppression control, which controls the battery heater cooling device 90 to suppress cooling of the heat-generating element 41 of the battery heater 40, making it easier for the temperature of the heat-generating element 41 of the battery heater 40 to rise. This allows the cut-off device 43 to perform a cut-off operation more quickly when the switching element 42 has a short-circuit fault, thereby cutting off the power supply to the heat-generating element 41 of the battery heater 40 more quickly and improving the safety of the power supply system 1.

Furthermore, in the cooling suppression control that controls the battery heater cooling device 90 to suppress cooling of the heat-generating element 41 of the battery heater 40, the battery heater cooling device 90 is controlled so that the temperature of the heat-generating element 41 of the battery heater 40 is equal to or higher than a predetermined temperature T0 and lower than an upper limit temperature Tmax that is higher than the predetermined temperature T0. This prevents the heat-generating element 41 of the battery heater 40 from rising in temperature excessively, while enabling the shut-off device 43 to shut off earlier.

In step S204, the control device ECU determines whether the cutoff device 43 has operated. For example, a sensor (not shown) that can detect whether the cutoff device 43 has operated is connected to the control device ECU. The sensor outputs an electrical signal indicating whether the cutoff device 43 has operated. The control device ECU determines whether the cutoff device 43 has operated based on the electrical signal output from the sensor.

If the control unit ECU determines in step S204 that the shutoff device 43 has operated (step S204: YES), it proceeds to step S301.

In step S301, the control unit ECU ends the cooling suppression control that controls the battery heater cooling device 90 to suppress cooling of the heat-generating element 41 of the battery heater 40. Then, the process proceeds to step S302.

In step S302, the control unit ECU stores information indicating that the shutoff device 43 has operated in the storage medium M. Then, the process proceeds to step S303.

In step S303, the control device ECU determines whether the user has turned off the system power switch PWR. If in step S303 the control device ECU determines that the user has not turned off the system power switch PWR, it enters a standby state until the user turns off the system power switch PWR (step S303: NO loop). If it determines that the user has turned off the system power switch PWR (step S303: YES), it proceeds to step S501.

In step S501, the control unit ECU switches the main contactor 51 from the connected state to the disconnected state, ending the series of operations.

On the other hand, if the control unit ECU determines in step S204 that the shutoff device 43 is not operating (step S204: NO), it proceeds to step S205.

In step S205, the control device ECU determines whether the system power switch PWR has been turned off by the user. If the control device ECU determines in step S205 that the system power switch PWR has been turned off by the user (step S205: YES), the control device ECU proceeds to step S206. If the control device ECU determines in step S205 that the system power switch PWR has not been turned off by the user (step S205: NO), the control device ECU returns to step S204.

In step S206, the control unit ECU prohibits the main contactor 51 from switching to the disconnected state and controls the main contactor 51 to maintain the connected state. Then, the process proceeds to step S207.

In step S207, the control unit ECU starts counting the elapsed time t. Then, the process proceeds to step S208.

In step S208, the control device ECU determines whether the cutoff device 43 has operated. For example, a sensor (not shown) that can detect whether the cutoff device 43 has operated is connected to the control device ECU. The sensor outputs an electrical signal indicating whether the cutoff device 43 has operated. The control device ECU determines whether the cutoff device 43 has operated based on the electrical signal output from the sensor.

If the control unit ECU determines in step S208 that the shutoff device 43 has operated (step S208: YES), it proceeds to step S401.

In step S401, the control unit ECU ends the cooling suppression control that controls the battery heater cooling device 90 to suppress cooling of the heat-generating element 41 of the battery heater 40. Then, the process proceeds to step S402.

In step S402, the control unit ECU stores information indicating that the shut-off device 43 has operated in the storage medium M. Then, the process proceeds to step S501.

In step S501, the control unit ECU switches the main contactor 51 from the connected state to the disconnected state, ending the series of operations.

If the switching element 42 is short-circuited and the user turns off the system power switch PWR, causing the main contactor 51 to switch to the disconnected state even though the circuit breaker 43 is not in the disconnected state. This causes the main contactor 51 to switch to the disconnected state even though the switching element 42 is short-circuited and the circuit breaker 43 is not in the disconnected state. In this state, the next time the user turns on the system power switch PWR and the main contactor 51 switches to the connected state, power will be unintentionally supplied to the heating element 41.

In this embodiment, if the switching element 42 has a short-circuit fault, even if the user turns off the system power switch PWR, the control unit ECU prohibits the main contactor 51 from switching to the disconnected state until the circuit breaker 43 performs a circuit breaker operation, and controls the main contactor 51 to remain connected. As a result, if the switching element 42 has a short-circuit fault, even if the user turns off the system power switch PWR, power is supplied to the heating element 41 until the circuit breaker 43 performs a circuit breaker operation. With the circuit breaker 43 in the disconnected state, the main contactor 51 switches to the disconnected state. Therefore, even if the user turns on the system power switch PWR and switches the main contactor 51 to the connected state, power is not supplied to the heating element 41 because the circuit breaker 43 is in the disconnected state. This prevents the main contactor 51 from switching from the disconnected state to the connected state when the switching element 42 has a short-circuit fault, thereby preventing power from being unintentionally supplied to the heating element 41.

On the other hand, if the control unit ECU determines in step S208 that the shutoff device 43 is not operating (step S208: NO), it proceeds to step S209.

In step S209, the control unit ECU determines whether the elapsed time t, which began counting in step S207, is equal to or greater than a predetermined time tset. The predetermined time tset is stored in the storage medium M of the control unit ECU.

If the control device ECU determines in step S209 that the elapsed time t is equal to or greater than the predetermined time tset (step S209: YES), the control device ECU proceeds to step S210. On the other hand, if the control device ECU determines in step S209 that the elapsed time t is less than the predetermined time tset (step S209: NO), the control device ECU returns to step S208.

In step S210, the control unit ECU prohibits the main contactor 51 from switching to the connected state. Then, the process proceeds to step S501.

In step S501, the control unit ECU switches the main contactor 51 from the connected state to the disconnected state, ending the series of operations.

In this way, if the elapsed time t after the system power switch PWR was turned off exceeds the preset time tset, the main contactor 51 is switched from the connected state to the disconnected state. This ensures the safety of electrical equipment other than the heating element 41 connected to the power supply system 1.

Furthermore, in this embodiment, if the elapsed time t after the system power switch PWR was turned off exceeds the preset time tset, the main contactor 51 is prohibited from switching to the connected state and is switched from the connected state to the disconnected state. Therefore, even if the user next turns on the system power switch PWR, the main contactor 51 will not switch to the connected state. This prevents the main contactor 51 from switching from the disconnected state to the connected state when the switching element 42 is short-circuited, thereby preventing power from being unintentionally supplied to the heating element 41. Furthermore, if the elapsed time t after the system power switch PWR was turned off exceeds the preset time tset, the safety of electrical equipment other than the heating element 41 connected to the power supply system 1 can be ensured.

Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art could conceive of various modifications or alterations within the scope of the claims, and it is understood that these naturally fall within the technical scope of the present invention. Furthermore, the components of the above embodiment may be combined in any manner as long as they do not deviate from the spirit of the invention.

For example, in this embodiment, the power supply system 1 is mounted on a vehicle, but it may also be mounted on something other than a vehicle.

This specification describes at least the following. The components corresponding to the above-mentioned embodiments are shown in parentheses as examples, but are not limited to these.

(1) a power supply (high-voltage battery BAT-H);
a load (heating element 41) that operates using power supplied from the power supply;
a contactor (main contactor 51) that can electrically connect and disconnect the power supply and the load by switching between a connected state and a disconnected state;
a switching element (switching element 42) for controlling the power supplied to the load;
a circuit breaker (43) that operates to cut off the power supply to the load when the temperature of the load becomes equal to or higher than a predetermined temperature (predetermined temperature T0);
a control device (controller ECU) capable of switching the contactor between a connected state and a disconnected state,
The control device
If the switching element has a short circuit fault,
a power supply system that controls the contactor to maintain the connected state until the interrupter operates;

(1) prevents the contactor from switching from a disconnected state to a connected state when a switching element has a short-circuit fault, thereby preventing power from being unintentionally supplied to the load.

(2) The power supply system according to (1),
the power supply system further includes a cooling device (battery heater cooling device 90) that cools the load;
the control device is capable of controlling the cooling device;
The control device
If the switching element has a short circuit fault,
The power supply system controls the cooling device to suppress cooling of the load.

According to (2), when a switching element has a short-circuit fault, the circuit breaker can be activated more quickly, thereby cutting off the power supply to the load more quickly and improving the safety of the power supply system.

(3) The power supply system according to (2),
The control device
When the switching element is short-circuited,
The power supply system controls the cooling device so that the temperature of the load is equal to or higher than the predetermined temperature and lower than an upper limit temperature (upper limit temperature Tmax) that is higher than the predetermined temperature.

(3) According to this, when a switching element experiences a short-circuit failure, the load temperature can be prevented from rising excessively and the circuit breaker can be caused to perform a circuit breaker operation more quickly.

(4) The power supply system according to any one of (1) to (3),
the power supply system further includes an operation unit (system power switch PWR) that can switch the power supply system between an on state and an off state;
The control device
When the switching element has a short circuit failure and a predetermined time has elapsed since the operation unit was operated to turn off the power supply system,
A power supply system that controls the contactor to be in the interrupted state.

According to (4), if the switching element has a short-circuit fault and a predetermined time has elapsed since the operating unit was operated to turn the power supply system off, the contactor is controlled to be in an interrupted state, thereby ensuring the safety of electrical equipment other than the load connected to the power supply system.

1 Power supply system 41 Heat generating element (load)
42 Switching element 43 Breaker device 51 Main contactor (contactor)
90 Battery heater cooling device (cooling device)
BAT-H High voltage battery (power supply)
ECU Control unit PWR System power switch (operation section)
T0 Predetermined temperature Tmax Upper limit temperature

Claims (4)

Power supply and
a load that operates using power supplied from the power source;
a contactor capable of electrically connecting and disconnecting the power supply and the load by switching between a connected state and a disconnected state;
a switching element for controlling the power supplied to the load;
a cutoff device that operates to cut off power supply to the load when the temperature of the load reaches or exceeds a predetermined temperature;
a control device capable of switching the contactor between a connected state and a disconnected state,
The control device
If the switching element has a short circuit fault,
a power supply system that controls the contactor to maintain the connected state until the interrupter operates; 2. The power supply system of claim 1,
the power supply system further includes a cooling device that cools the load;
the control device is capable of controlling the cooling device;
The control device
If the switching element has a short circuit fault,
The power supply system controls the cooling device to suppress cooling of the load. 3. The power supply system according to claim 2,
The control device
When the switching element is short-circuited,
The power supply system controls the cooling device so that the temperature of the load is equal to or higher than the predetermined temperature and lower than an upper limit temperature that is higher than the predetermined temperature. 4. The power supply system according to claim 1,
the power supply system further includes an operation unit that can switch the power supply system between an on state and an off state;
The control device
When the switching element has a short circuit failure and a predetermined time has elapsed since the operation unit was operated to turn off the power supply system,
A power supply system that controls the contactor to be in the interrupted state.