JP2022160916A - Power supply device and disconnection detection method - Google Patents

Abstract

To provide a power supply device and a disconnection detection method that can reliably perform backup control by a second power supply when a power failure occurs in a first system.SOLUTION: A power supply device includes a first system, a second system, an inter-system switch, a current supply portion, and a disconnection detection portion. The first system supplies the power of a first power supply to a load. The second system supplies the power of a second power supply to the load. The inter-system switch is capable of connecting and disconnecting the connection path that connects the first system and the second system. The current supply portion constantly feeds a current through a specific path between a connection point between the connection path and the second system and the second power supply. The disconnection detection portion detects disconnection of the specific path according to the presence or absence of a current flowing through the specific path.SELECTED DRAWING: Figure 1

Description

The disclosed embodiments relate to a power supply device and a disconnection detection method.

Conventionally, a first power supply and a second power supply have been provided, and one power supply system has been provided so that even if a power failure occurs during automatic driving of a vehicle, the vehicle can be evacuated to a safe place and stopped. There is a redundant power supply system that supplies power to an in-vehicle device (load) for automatic operation from the other power supply system when a ground fault occurs in the other power supply system (see, for example, Patent Document 1).

The redundant power supply system includes a first system connected to a first load for automatic operation, a second system connected to a second load having the same function as the first load, and a power supply between the first system and the second system. and an inter-system switch capable of connecting and disconnecting the

The redundant power supply system normally connects intersystem switches to supply power from the first power supply to the first load and the second load. When a power failure such as a ground fault occurs in the first system, the redundant power supply system cuts off the switch between systems, supplies power from the second power supply to the second load, and performs backup control for evacuation running. conduct.

JP 2017-61240 A

However, in the redundant power supply system, if a disconnection occurs between the second power supply and the connection point between the connection path connecting the first system and the second system and the second system, the power supply to the first system If a failure occurs, backup control by the second power supply cannot be performed.

One aspect of the embodiments has been made in view of the above, and is a power supply device and disconnection detection method that can reliably perform backup control by a second power supply when a power failure occurs in the first system. intended to provide

A power supply device according to an aspect of an embodiment includes a first system, a second system, an inter-system switch, a current supply section, and a disconnection detection section. The first system supplies the power of the first power supply to the load. The second system supplies the power of the second power supply to the load. An inter-system switch is capable of connecting and disconnecting a connection path that connects the first system and the second system. The current supply unit constantly feeds a current through a specific path between a connection point between the connection path and the second system and the second power supply. The disconnection detection unit detects disconnection of the specific path according to the presence or absence of current flowing through the specific path.

ADVANTAGE OF THE INVENTION The power supply device and disconnection detection method which concern on one aspect|mode of embodiment produce the effect that backup control by a 2nd power supply can be reliably performed, when a power supply failure occurs in a 1st system.

FIG. 1 is an explanatory diagram showing a configuration example of a power supply device according to the first embodiment. FIG. 2 is an explanatory diagram showing an operation example of the power supply device according to the first embodiment. FIG. 3 is an explanatory diagram showing an operation example of the power supply device according to the first embodiment. FIG. 4 is an explanatory diagram showing an operation example of the power supply device according to the first embodiment. FIG. 5 is an explanatory diagram showing an operation example of the power supply device according to the first embodiment. 6 is a flowchart illustrating an example of processing executed by a disconnection determination unit of the power supply according to the first embodiment; FIG. FIG. 7 is an explanatory diagram showing a configuration example of a power supply device according to the second embodiment. FIG. 8 is an explanatory diagram showing an operation example of the power supply device according to the second embodiment. FIG. 9 is a flowchart illustrating an example of processing executed by a disconnection determining unit of the power supply according to the second embodiment;

Hereinafter, embodiments of a power supply device and a disconnection detection method will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below. In the following, a power supply device installed in a vehicle equipped with an automatic driving function and supplying electric power to a load will be described as an example. good too.

In the following description, the vehicle in which the power supply device is installed is an electric vehicle or a hybrid vehicle, but the vehicle in which the power supply device is installed may be an engine vehicle that runs on an internal combustion engine.

[1. First Embodiment]
[1-1. Power Supply Configuration]
FIG. 1 is an explanatory diagram showing a configuration example of a power supply device according to the first embodiment. As shown in FIG. 1, the power supply device 1 according to the first embodiment is connected to a first power supply 10, a first load 101, a general load 102, a second load 103, and an automatic operation control device 100. be. The power supply device 1 includes a first system 110 that supplies power from a first power supply 10 to a first load 101 and a general load 102, and a second system 120 that supplies power from a second power supply 20, which will be described later, to a second load 103. Prepare.

The first load 101 includes a load for automatic operation. For example, the first load 101 includes a steering motor, an electric brake device, an in-vehicle camera, a radar, etc. that operate during automatic driving. General loads 102 include, for example, displays, air conditioners, audio, video, and various lights.

The second load 103 has functions similar to those of the first load 101 . The second load 103 includes, for example, devices that operate during automatic driving, such as a steering motor, an electric brake device, an in-vehicle camera, and a radar. The first load 101 , the general load 102 and the second load 103 operate with power supplied from the power supply 1 . The automatic driving control device 100 is a device that operates the first load 101 or the second load 103 to control the automatic driving of the vehicle.

The first power supply 10 includes a DC/DC converter (hereinafter referred to as "DC/DC11") and a lead battery (hereinafter referred to as "PbB12"). The battery of the first power supply 10 may be any secondary battery other than PbB12.

DC/DC 11 is connected to a generator and a high-voltage battery having a higher voltage than PbB 12 , steps down the voltage of the generator and high-voltage battery, and outputs the voltage to first system 110 . In addition, the DC/DC 11 can also make the voltage of the first system 110 higher than the voltage of the second power supply 20 described later by adjusting the amount of voltage step-down.

A generator is, for example, an alternator that converts the kinetic energy of a running vehicle into electricity to generate electricity. A high-voltage battery is, for example, a battery for driving a vehicle mounted on an electric vehicle or a hybrid vehicle.

When the first power supply 10 is installed in an engine vehicle, an alternator (generator) is provided instead of the DC/DC 11 . The DC/DC 11 charges the PbB 12, supplies power to the first load 101 and the general load 102, supplies power to the second load 103, and charges the second power supply 20, which will be described later.

The power supply device 1 includes a second power supply 20 , an intersystem switch 41 , a battery switch 42 , a disconnection determination section 3 , a current supply section 61 , voltage sensors 51 and 52 , and a current sensor 53 .

The second power supply 20 is a backup power supply when the first power supply 10 cannot supply power. The second power source 20 includes a lithium ion battery (hereinafter referred to as "LiB21"). The battery of the second power supply 20 may be any secondary battery other than LiB21.

Inter-system switch 41 is a switch capable of connecting and disconnecting connection path 130 that connects first system 110 and second system 120 . The battery switch 42 is a switch that can connect and disconnect the LiB 21 and the second system 120 .

The current supply unit 61 is a circuit that always supplies current to the specific path 121 if there is no disconnection in the specific path 121 between the connection point P between the connection path 130 and the second system 120 and the second power supply 20 . Specifically, the current supply section 61 is a discharge path branched from the specific path 121 and having a current limiting element 62 . It should be noted that "always" in the present embodiment is not limited to the concept of "continuously", but also includes the concept of "regularly".

The current limiting element 62 is, for example, a resistor having one end connected to the specific path 121 and the other end connected to the ground, and having a very large resistance value that discharges a very small amount of current from the specific path 121 to the ground. Note that the current limiting element 62 is not limited to a resistor, and may be other circuit elements such as a plurality of series-connected diodes as long as they are circuit elements capable of reducing the flow of current. .

Voltage sensor 51 is connected between first power supply 10 and first load 101 . Voltage sensor 51 detects the voltage of first system 110 and outputs the detection result to disconnection determination unit 3 . Voltage sensor 52 is connected between specific path 121 and second load 103 . Voltage sensor 52 detects the voltage of second system 120 and outputs the detection result to disconnection determination unit 3 .

The disconnection determination unit 3 includes a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and various circuits. The disconnection determination unit 3 may be configured by hardware such as ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array).

The disconnection determination unit 3 controls the operation of the power supply device 1 by having the CPU execute a program stored in the ROM using the RAM as a work area. Disconnection determination unit 3 controls inter-system switch 41 and battery switch 42 based on detection results input from voltage sensors 51 and 52 .

Disconnection determination unit 3 supplies power from first power supply 10 or second power supply 20 to first load 101, general load 102, and second load 103 by controlling intersystem switch 41 and battery switch 42. . Further, the disconnection determination unit 3 detects disconnection of the specific path 121 according to the presence or absence of current flowing through the specific path 121 based on the detection result input from the current sensor 53 .

The disconnection determination unit 3 determines that the specific path 121 is not disconnected if there is current flowing through the specific path 121 during the disconnection determination, and that the specific path 121 is disconnected if there is no current flowing through the specific path 121. I judge.

As described above, the current supply unit 61 always supplies current to the specific path 121 if there is no disconnection in the specific path 121, so the disconnection determination unit 3 can immediately detect the occurrence of disconnection in the specific path 121. .

When a wire breakage occurs in the specific route 121, the wire breakage determination unit 3 notifies the automatic operation control device 100 to that effect. In addition, when disconnection occurs in the specific route 121, the disconnection determination unit 3 may notify the automatic operation control device 100 that automatic operation is impossible. Moreover, when the specific route 121 does not have a wire breakage, the wire breakage determination unit 3 may notify the automatic operation control device 100 that automatic operation is possible.

In this way, since the disconnection determination unit 3 grasps the state of the disconnection in the specific route 121 in real time, when a power failure occurs in the first system 110, the backup control by the second power supply 20 can be reliably performed. can be done. An operation example of the power supply device 1 will be described later with reference to FIGS. 2 to 5. FIG.

Further, the disconnection determination unit 3 controls the inter-system switch 41 and the battery switch 42 based on the detection result input from the voltage sensor 52, and charges the LiB 21 with the power supplied from the first power supply 10. .

The disconnection determination unit 3 shuts off the inter-system switch 41 at predetermined timings such as when the vehicle is started, when the vehicle is terminated, and during manual operation, for example, and turns on the battery switch 42 to detect the voltage of the LiB 21 from the voltage sensor 52. Get detection results.

If the voltage of the LiB 21 is equal to or lower than the charging threshold, the disconnection determination unit 3 conducts the inter-system switch 41 to charge the LiB 21 with the power supplied from the first power supply 10, and shuts off the battery switch 42 when the charging is completed. do.

Further, when a power failure such as a ground fault occurs in one of the first system 110 and the second system 120, the disconnection determination unit 3 supplies power to the load using the other system. As a result, even if one of the systems has a ground fault during automatic operation, the power supply device 1 uses the other system, and the automatic operation control device 100 makes the vehicle evacuate to a safe place and stop the vehicle. can be done.

Next, the operation of the power supply device 1 will be described with reference to FIGS. 2 to 5. FIG. 2 to 5, the disconnection determination unit 3, the automatic operation control device 100, and the signal line indicated by the dashed arrow in FIG. 1 are omitted in order to facilitate understanding of the operation of the power supply device 1.

[1-2. Normal operation of the power supply]
As shown in FIG. 2, disconnection determination unit 3 conducts inter-system switch 41 and cuts off battery switch 42 as shown in FIG. Power is supplied from the first power source 10 to the first load 101 , the general load 102 and the second load 103 .

[1-3. 2nd system ground fault operation of power supply device]
Next, with reference to FIG. 3, the operation of the power supply device 1 at the time of a ground fault in the second system will be described. If a ground fault occurs in the first system 110 or the second system during normal operation shown in FIG. descend.

Therefore, disconnection determination unit 3 determines that a ground fault has occurred in first system 110 or second system 120 when at least one of the detection results input from voltage sensors 51 and 52 is equal to or lower than the ground fault threshold. , the inter-system switch 41 is cut off, as shown in FIG.

After disconnecting the system switch 41 , the disconnection determination unit 3 turns on the battery switch 42 to determine the ground fault system based on the detection results of the voltage sensors 51 and 52 . When the detection result of the voltage sensor 51 exceeds the ground fault threshold and the detection result of the voltage sensor 52 is still equal to or less than the ground fault threshold, the disconnection determination unit 3 determines that the ground fault 200 is in the second system 120, and notifies that effect. The automatic operation control device 100 is notified.

At this time, the disconnection determination unit 3 restores the battery switch 42 to the cut-off state. As a result, the automatic driving control device 100 operates the first load 101 with the electric power supplied from the first power supply 10 to the first load 101 while preventing further discharge of the LiB 21, thereby allowing the vehicle to run for evacuation. can be done.

[1-4. 1st system ground fault operation of power supply device]
Next, with reference to FIG. 4, the operation of the power supply device 1 at the first system ground fault will be described. Disconnection determination unit 3 detects a ground fault in first system 110 or second system 120 when the detection result input from voltage sensors 51 and 52 becomes equal to or less than the ground fault threshold, similarly to the operation at the time of a ground fault in second system 120. It is determined that this has occurred, and as shown in FIG. 4, the intersystem switch 41 is shut off.

After disconnecting the system switch 41 , the disconnection determination unit 3 turns on the battery switch 42 to determine the ground fault system based on the detection results of the voltage sensors 51 and 52 . When the detection result of the voltage sensor 51 is still equal to or less than the ground fault threshold value and the detection result of the voltage sensor 52 exceeds the ground fault threshold value, the disconnection determination unit 3 determines that the first system 110 has a ground fault 200, and to that effect. is notified to the automatic operation control device 100 .

Then, the disconnection determination unit 3 maintains the conduction of the battery switch 42 . As a result, the automatic driving control device 100 can operate the second load 103 with the electric power supplied from the second power supply 20 to the second load 103 to cause the vehicle to run in an evacuation mode.

However, if disconnection occurs in the specific path 121 at this time, the power supply device 1 may perform backup control to supply power from the second power supply 20 to the second load 103 even if the battery switch 42 is turned on. can't Therefore, the power supply device 1 constantly monitors the presence or absence of disconnection in the specific path 121 during normal operation.

[1-5. Disconnection monitoring in a specific route]
As shown in FIG. 5, the power supply device 1 is in a state in which the first power supply 10 and the ground are always connected via the current supply section 61 during normal operation. Therefore, if the specific path 121 is not broken during normal operation, the power supply device 1 can constantly supply current from the first power supply 10 to the ground via the specific path 121 and the current supply unit 61 .

In the power supply device 1 , current stops flowing through the specific path 121 when disconnection occurs in the specific path 121 . Therefore, if the current is detected by the current sensor 53, the disconnection determination unit 3 can determine that there is no disconnection in the specific route 121, and if the current is no longer detected by the current sensor 53, disconnection occurs in the specific route 121. It can be determined immediately.

In addition, the current supply unit 61 is configured such that a current limiting element 62 such as a resistive element is connected between the specific path 121 and the ground. can flow. In addition, since the current limiting element 62 limits the current supplied from the specific path 121 and discharges it to the ground, it is possible to suppress waste of the current used for detecting disconnection of the specific path 121 .

[1-6. Processing executed by disconnection determination unit]
Next, an example of processing executed by the disconnection determination unit according to the first embodiment will be described with reference to FIG. 6 . 6 is a flowchart illustrating an example of processing executed by a disconnection determination unit according to the first embodiment; FIG. The disconnection determination unit 3 according to the first embodiment repeatedly executes the processing shown in FIG. 6 during normal operation.

Specifically, as shown in FIG. 6, the disconnection determination unit 3 first determines whether or not there is current flowing through the specific path 121 (step S101). Then, when it is determined that there is no current flowing through the specific route 121 (step S101, No), the disconnection determination unit 3 determines that there is a disconnection in the specific route 121 (step S107), and notifies the automatic operation control device 100 to that effect. (step S105), and the process ends. After that, the disconnection determination unit 3 starts processing again from step S101.

Further, when determining that there is a current flowing through the specific path 121 (step S101, Yes), the disconnection determination unit 3 determines whether or not a ground fault has occurred (step S102). When the disconnection determination unit 3 determines that the ground fault has not occurred (step S102, No), the process ends. After that, the disconnection determination unit 3 starts processing again from step S101.

Further, when the disconnection determination unit 3 determines that a ground fault has occurred (step S102, Yes), the inter-system switch 41 is cut off, the battery switch 42 is turned on (step S103), and the ground fault of the first system 110 is detected. It is determined whether or not (step S104).

When the disconnection determination unit 3 determines that there is a ground fault in the first system 110 (step S104, Yes), it notifies the automatic operation control device 100 of this (step S105), and ends the process. As a result, evacuation travel is performed in the second system 120 . After that, the disconnection determination unit 3 starts processing again from step S101.

Further, when the disconnection determination unit 3 determines that the ground fault is not in the first system 110 (step S104, No), the ground fault is in the second system 120, so the battery switch 42 is cut off (step S106), The automatic operation control device 100 is notified that a ground fault has occurred in the second system 120 (step S105), and the process ends. As a result, the first system 110 performs limp-away travel. After that, the disconnection determination unit 3 starts processing again from step S101.

In addition, when the disconnection determination unit 3 detects a ground fault in the first system 110, a ground fault in the second system 120, or a disconnection in the specific route 121 and notifies the automatic operation control device 100 to that effect, from step S101 It is also possible to terminate the processing as it is without starting the processing again.

[2. First Embodiment]
[2-1. Power Supply Configuration and Operation]
Next, a configuration example and an operation example of the power supply device according to the second embodiment will be described with reference to FIGS. 7 and 8. FIG. FIG. 7 is an explanatory diagram showing a configuration example of a power supply device according to the second embodiment. FIG. 8 is an operation explanatory diagram of the power supply device according to the second embodiment. Here, among the constituent elements shown in FIG. 7, the constituent elements that are the same as the constituent elements shown in FIG. 1 are denoted by the same reference numerals as those shown in FIG.

As shown in FIG. 7, the power supply device 1a according to the second embodiment does not include the current supply unit 61 shown in FIG. It functions as the current supply section 63 .

The DC/DC 11 functioning as the current supply section 63 functions as a transforming section 64 that controls the voltage of the first power supply 10 to always be higher or lower than the voltage of the second power supply 20 . Further, the power supply device 1a includes a voltage sensor 54 that detects the voltage of the second power supply 20 and outputs the detection result to the disconnection determination section 3a.

The disconnection determination unit 3a controls the inter-system switch 41 and the battery switch 42 in the normal operation, the first system ground fault operation, and the second system ground fault operation, as in the first embodiment. Specifically, the disconnection determination unit 3a conducts the inter-system switch 41 and cuts off the battery switch 42 in normal times, so that the power of the first power supply 10 is distributed to the first load 101, the general load 102, and the second load. 103.

Further, when a ground fault occurs in the first system 110, the disconnection determination unit 3a shuts off the inter-system switch 41, turns on the battery switch 42, and supplies the power of the second power supply 20 to the second load 103. do. Further, when a ground fault occurs in the second system 120, the disconnection determination unit 3a shuts off the inter-system switch 41 and supplies the power of the first power supply 10 to the first load 101 with the battery switch 42 shut off. do.

However, the disconnection determination unit 3a differs from the first embodiment in its operation when determining whether or not there is a disconnection in the specific route 121 . Specifically, at a predetermined timing for determining whether or not there is a disconnection in the specific path 121, the disconnection determination unit 3a turns on the battery switch 42 while the system switch 41 is conducting, as shown in FIG. conduct.

As a result, for example, when the voltage of the first power supply 10 is higher than the voltage of the second power supply 20, the current sensor 53 detects the connection point P as indicated by the thick arrow in FIG. A current flows from to the second power supply 20, so the current is detected. At this time, if there is a disconnection in the specific path 121, the current sensor 53 does not detect the current because the current does not flow.

Further, when the voltage of the first power supply 10 is lower than the voltage of the second power supply 20, the current sensor 53 is connected from the second power supply 20 as indicated by the dashed arrow in FIG. Since a current flows through the point P, the current is detected. At this time, if there is a disconnection in the specific path 121, the current sensor 53 does not detect the current because the current does not flow.

Therefore, if the current sensor 53 detects no current when the battery switch 42 is turned on while the intersystem switch 41 is turned on, the disconnection determination unit 3a determines that there is a disconnection in the specific path 121. do.

Further, if the current sensor 53 detects a current when the battery switch 42 is turned on while the system switch 41 is turned on, the disconnection determination unit 3a determines that there is no disconnection in the specific path 121. .

However, in the power supply device 1a, if the voltage of the first power supply 10 and the voltage of the second power supply 20 are equal when the battery switch 42 is turned on while the system switch 41 is turned on, there is no disconnection. No current flows through the specific path 121 either.

Therefore, when the battery switch 42 is turned on, the disconnection determination unit 3a determines that the voltage of the first power supply 10 is always higher or lower than the voltage of the second power supply 20 based on the detection results of the voltage sensors 51 and 54. control so that As a result, the current supply unit 63 can always supply current to the specific path 121 if there is no disconnection in the specific path 121 when the disconnection determination of the specific path 121 is performed.

For example, the disconnection determination unit 3a operates the DC/DC 11 to control the voltage of the first power supply 10 to be higher than the voltage of the second power supply 20. FIG. At this time, the disconnection determination unit 3a reduces the voltage of the first power supply 10 by operating the DC/DC 11 so that the voltage step-down amount of the voltage of the generator or the high-voltage battery by the DC/DC 11 is smaller than that in normal times. lower the pressure.

Further, the disconnection determination unit 3 a controls the voltage of the first power supply 10 to be lower than the voltage of the second power supply 20 by stopping the operation of the DC/DC 11 . When the DC/DC 11 stops operating, the PbB 12 continues to supply power to the first load 101, the general load 102, and the second load 103 without being charged, so the voltage becomes lower than the voltage of the second power supply 20.

In addition to stopping the DC/DC 11, the disconnection determination unit 3a forcibly operates the first load 101 and the general load 102 by, for example, a higher-level ECU (Electronic Control Unit) when determining disconnection of the specific route 121. may be caused to consume the power of the first power supply 10 . As a result, the disconnection determination unit 3a can control the voltage of the first power supply 10 to be lower than the voltage of the second power supply 20 more quickly.

[2-2. Processing executed by disconnection determination unit]
Next, an example of processing executed by the disconnection determination unit according to the second embodiment will be described with reference to FIG. 9 . FIG. 9 is a flowchart illustrating an example of processing executed by a disconnection determination unit according to the second embodiment; The disconnection determination unit 3a according to the second embodiment repeatedly executes the processing shown in FIG. 9 during normal operation.

Specifically, as shown in FIG. 9, the disconnection determination unit 3a first determines whether it is time to detect a disconnection in the specific route 121 or not. The disconnection detection timing may be constant or may be at a predetermined cycle. When the disconnection determination unit 3a determines that it is not the disconnection detection timing (step S201, No), the process proceeds to step S206.

Further, when the disconnection determination unit 3a determines that it is disconnection detection timing (step S201, Yes), it controls the voltage of the first power supply 10 to be higher or lower than the voltage of the second power supply 20 (step S202). After that, the disconnection determination unit 3a turns on the battery switch 42 (step S203). Note that the order of the processing in step S202 and the processing in step S203 may be reversed.

Subsequently, the disconnection determination unit 3a determines whether or not there is current flowing through the specific path 121 (step S204). When the disconnection determination unit 3a determines that there is no current flowing through the specific route 121 (step S204, No), it determines that there is a disconnection in the specific route 121 (step S211), and notifies the automatic operation control device 100 to that effect ( Step S209), the process ends. After that, the disconnection determination unit 3a restarts the processing from step S201.

Further, when the disconnection determination unit 3a determines that there is a current flowing through the specific path 121 (step S204, Yes), the disconnection determination unit 3a shuts off the battery switch 42 (step S205), and determines whether or not a ground fault has occurred ( step S206). When it is determined that the ground fault has not occurred (step S206, No), the disconnection determination unit 3a terminates the process and restarts the process from step S201.

Further, when the disconnection determination unit 3a determines that a ground fault has occurred (step S206, Yes), the inter-system switch 41 is cut off, the battery switch 42 is turned on (step S207), and the ground fault of the first system 110 is detected. It is determined whether or not (step S208). When the disconnection determination unit 3a determines that there is a ground fault in the first system 110 (step S208, Yes), it notifies the automatic operation control device 100 of this (step S209), and ends the process. As a result, evacuation travel is performed in the second system 120 . After that, the disconnection determination unit 3a restarts the processing from step S201.

Further, when the disconnection determination unit 3a determines that there is no ground fault in the first system 110 (step S208, No), it is a ground fault in the second system 120, so it shuts off the battery switch 42 (step S210), This is notified to the automatic operation control device 100 (step S209), and the process ends. As a result, the first system 110 performs limp-away travel. After that, the disconnection determination unit 3a restarts the processing from step S201.

In addition, when the disconnection determination unit 3a detects a ground fault in the first system 110, a ground fault in the second system 120, or a disconnection in the specific route 121 and notifies the automatic operation control device 100 to that effect, from step S201 It is also possible to terminate the processing as it is without starting the processing again.

Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the invention are not limited to the specific details and representative embodiments so shown and described. Accordingly, various changes may be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and equivalents thereof.

1, 1a power supply device 10 first power supply 11 DC/DC
12PbB
20 second power supply 21 LiB
3 disconnection determination unit 41 system switch 42 battery switch 51, 52, 54 voltage sensor 53 current sensor 61, 63 current supply unit 62 current limiting element 64 transformer unit 100 automatic operation control device 101 first load 102 general load 103 second Load 110 First system 120 Second system 121 Specific route 130 Connection route P Connection point

Claims (4)

a first system that supplies power from the first power supply to a load;
a second system that supplies power from the second power supply to a load;
an inter-system switch capable of connecting and disconnecting a connection path connecting the first system and the second system;
a current supply unit that always supplies a current to a specific path between a connection point between the connection path and the second system and the second power supply;
a disconnection detection unit that detects disconnection of the specific path according to the presence or absence of current flowing through the specific path;
A power supply device comprising: The current supply unit
The power supply device according to claim 1, wherein the discharge path branches from the specific path and has a current limiting element. The current supply unit
2. The power supply device according to claim 1, wherein the voltage of said first power supply is a transforming section that controls such that the voltage of said first power supply is always higher or lower than the voltage of said second power supply. a first system that supplies power from the first power supply to a load;
a second system that supplies power from the second power supply to a load;
an inter-system switch capable of connecting and disconnecting a connection path connecting the first system and the second system; and
constantly passing a current through a specific path between the connection point of the connection path and the second system and the second power supply;
The disconnection detection unit of the power supply device,
A disconnection detection method, comprising: detecting disconnection of the specific path according to the presence or absence of current flowing through the specific path.

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