JP2009224126A - Power supply control system - Google Patents

Abstract

An overvoltage is prevented from being applied between a pair of input / output terminals of a load circuit that exchanges power with a secondary battery.
In a power supply system, a switch is disposed on a bypass circuit that connects a positive electrode of a terminal pair on the secondary battery and a positive electrode of a terminal pair on a load circuit in a bidirectional buck-boost converter. ing. When the voltage V _LOAD between the terminal pair of the load circuit 30 exceeds a predetermined threshold value V _LIM (step S102; Yes), the switch 26 is turned on (step S104) and stored between the terminal pair of the load circuit 30. The secondary battery 21 is charged with the generated power and the regenerative power output from the load circuit 30.
[Selection] Figure 1

Description

  The present invention relates to a power supply control system for controlling a power supply form from a fuel cell to a load circuit.

  As is well known, a fuel cell vehicle includes an electric motor as a drive engine and a fuel cell that outputs DC power as a power source. In addition, the fuel cell vehicle includes a voltage converter for boosting DC power between the load circuit including the electric motor and the fuel cell from the viewpoint of miniaturization of the fuel cell. Further, the fuel cell vehicle includes a rechargeable secondary battery and a bidirectional voltage converter for controlling charging / discharging in the secondary battery so that the regenerative energy generated by the electric motor can be reused. (For example, Patent Document 1). In general, a circuit between the load circuit and the fuel cell is configured so that regenerative electricity does not flow toward the fuel cell in order to protect the fuel cell.

  Incidentally, since the bidirectional voltage converter and the bag described above are also electronic components, they will eventually fail. If the bidirectional voltage converter breaks down and electricity stops flowing, the regenerative energy from the motor in the load circuit is not sent to the secondary battery or the fuel cell, so the destination is lost and the load circuit is turned on. Overvoltage is generated between the output terminal pair. This overvoltage becomes a factor causing destruction of electronic components such as a load circuit and a voltage converter.

  Even if the bidirectional voltage converter is not faulty, even if an overvoltage is applied between the input / output terminal pair of the load circuit due to some other factor, the electronic circuit such as the load circuit or voltage converter is still used. Parts can be destroyed.

JP 2005-348530 A JP 08-116663 A Japanese Patent Laid-Open No. 07-288879

  The present invention has been made in view of the problems of the prior art as described above, and the problem is that overvoltage is generated between the input / output terminal pair of the load circuit that exchanges power with the secondary battery. It is to prevent it from hanging.

  A first aspect of a power supply control system devised to solve the above problems is a chargeable / dischargeable fuel cell between a fuel cell that outputs DC power and a load circuit to which the DC power is supplied. Bidirectional voltage converter for converting powering power or regenerative power voltage between the secondary battery and the load circuit in order to control the power supply form between the secondary battery and the load circuit, both When the voltage between the switch placed on the bypass circuit that connects the positive electrodes of the input terminal pair and output terminal pair of the voltage converter and the input / output terminal pair of the load circuit exceeds a predetermined threshold It is characterized by having a control part which performs control which throws in a switch.

With this configuration, when the voltage between the input / output terminal pair of the load circuit exceeds a predetermined threshold, the positive terminals of the input terminal pair and the output terminal pair of the bidirectional voltage converter are short-circuited, and the load The power stored between the input / output terminal pair of the circuit and the regenerative power output from the load circuit are charged to the secondary battery. For this reason, if the predetermined threshold is set to a value that is sufficiently low so as not to cause damage to the electronic components such as the load circuit and the voltage converter, the load is caused by a failure of the bidirectional voltage converter or other factors. Even if the voltage between the input / output terminal pair of the circuit rises, the electronic component is not destroyed.

  Further, a second aspect of the power supply control system devised to solve the above-described problem is that a fuel cell that outputs DC power and a load circuit that is a supply destination of the DC power can be freely charged and discharged. Bidirectional voltage converter for converting the power running power or regenerative power voltage between the secondary battery and the load circuit in order to control the power supply form between the secondary battery and the load circuit, A switch placed on the bypass circuit that connects the positive electrodes of the input terminal pair and the output terminal pair of the bidirectional voltage converter, and a control to turn on the switch when the bidirectional voltage converter fails. It is characterized by including a control unit for performing.

  If comprised in this way, when a bidirectional voltage converter fails, the positive electrodes in the input terminal pair and output terminal pair of a bidirectional voltage converter will be short-circuited. Therefore, even if the regenerative power is output from the load circuit during the failure of the bidirectional voltage converter, the regenerative power is charged to the secondary battery through the bypass circuit, and between the input / output terminal pairs of the load circuit. There is no overvoltage applied. As a result, the electronic components such as the load circuit and the voltage converter are not destroyed.

  Further, a third aspect of the power supply control system devised to solve the above-described problem is that a fuel cell that outputs DC power and a load circuit that is a supply destination of the DC power can be freely charged and discharged. Bidirectional voltage converter for converting power running power or regenerative power voltage between the secondary battery and the load circuit in order to control the power supply mode between the secondary battery and the load circuit, In addition, when the voltage between the input / output terminal pair of the load circuit exceeds a predetermined threshold, the bidirectional voltage converter is configured to short-circuit the positive electrodes of the input terminal pair and the output terminal pair of the bidirectional voltage converter. It is characterized by including a control unit for controlling.

  If comprised in this way, like the power supply control system of the 1st aspect mentioned above, when the voltage between the input-output terminal pair of a load circuit exceeds a predetermined threshold value, the input of a bidirectional voltage converter The positive electrodes of the terminal pair and the output terminal pair are short-circuited, and the power stored between the input / output terminal pairs of the load circuit and the regenerative power output from the load circuit are charged to the secondary battery. . For this reason, if the predetermined threshold is set to a value that is sufficiently low so as not to cause damage to the electronic components such as the load circuit and the voltage converter, the load is caused by a failure of the bidirectional voltage converter or other factors. Even if the voltage between the input / output terminal pair of the circuit rises, the electronic component is not destroyed.

  Therefore, according to the power supply control system described above, an overvoltage is not applied between the input / output terminal pair of the load circuit that exchanges power with the secondary battery.

  Hereinafter, a power supply system that is an embodiment of the power supply control system described above will be described with reference to the accompanying drawings. The power supply system described below is a system for supplying power to an electrical component that is a load circuit of a fuel cell vehicle.

Embodiment 1

<< Configuration >>
FIG. 1 is a configuration diagram of a power supply system according to the first embodiment.

  As shown in FIG. 1, the power supply system of the first embodiment includes a first electric circuit 10 and a second electric circuit 20 connected to a load circuit 30.

<Configuration of load circuit>
The load circuit 30 includes an AC motor 31, an inverter 32, other electrical equipment 33, and a voltage sensor 34.

  The AC motor 31 is an AC for converting electrical energy into mechanical energy to supply rotational force to the axle of the fuel cell vehicle, or for converting rotational energy of the axle into electrical energy and outputting it as regenerative power. It is a generator.

  The inverter 32 is an orthogonal converter for converting direct current power into alternating current power and performing inverse transformation thereof.

  The electrical component 33 is a device such as an air conditioner, indoor lighting, car audio, a car navigation system, an electric seat device, an anti-theft device, or a headlight system.

The voltage sensor 34 is an electronic component for detecting the voltage V _LOAD applied between the terminal pairs of the entire load circuit 30.

  Each terminal pair of the inverter 32 is connected to a terminal pair of the entire load circuit 30, and each terminal pair of the electrical component 33 is also connected to a terminal pair of the entire load circuit 30. Therefore, the inverter 32 and the electrical component 33 are connected in parallel.

  In addition, the terminal pair of the first electric circuit 10 is connected to the terminal pair of the entire load circuit 30, and the terminal pair of the second electric circuit 20 is also connected to the terminal pair of the entire load circuit 30. Therefore, the first electric circuit and the second electric circuit are connected in parallel.

<Configuration of first electric circuit>
The first electric circuit 10 mainly includes a fuel cell (FC) 11, an input smoothing capacitor 13, a fuel cell boost converter 14, and an output smoothing capacitor 15.

  The fuel cell 11 is a power generator that outputs DC power by chemically reacting hydrogen as fuel and oxygen in the atmosphere. As is well known, the fuel cell 11 has a stack composed of a plurality of single cells, a fuel tank in which fuel to be supplied to each single cell is packed at a high pressure, and air to each single cell. An air compressor for feeding is provided as a main component. In addition, the stack includes an output terminal pair for outputting power generated in each single cell. In FIG. 1, the upper output terminal is a positive electrode and the lower output terminal is a negative electrode.

  The fuel cell boost converter 14 is a DC voltage converter for boosting and outputting input DC power, and this input terminal pair is connected to the output terminal pair of the fuel cell 11, respectively. , Respectively, are connected to a terminal pair of the load circuit 30.

The fuel cell boost converter 14 employs an internal configuration as shown in FIG. 2, for example. The fuel cell boost converter 14 of FIG. 2 includes an arm that connects an output terminal pair (the right terminal pair in the figure), from the positive side (upper side in the figure) to the negative side (lower side in the figure). In order, the diode 14a and the switching element 14b are connected in series. The diode 14a has its forward direction opposite to the direction in which electricity flows from the positive side to the negative side (hereinafter, such a connection state is expressed as a reverse polarity state). 14b is directed forward in the direction in which electricity flows from the positive side to the negative side. Furthermore, a diode 14c is connected in parallel to the switching element 14b, and the diode 14c is also in a reverse polarity state. The negative input terminal of the fuel cell boost converter 14 in FIG. 2 is connected to the negative output terminal, and the positive input terminal is connected between the diode 14a and the switching element 14b in the arm via the reactor 14d. Connected to the midpoint. Therefore, in the fuel cell boost converter 14 illustrated in FIG. 2, when voltage is applied to the input terminal pair, when the switching element 14 b becomes conductive, electricity flows through the switching element 14 b, thereby causing the reactor 14 d. Electromagnetic energy is stored in On the contrary, when the switching element 14b is cut off, electricity flows from the input terminal to the positive terminal of the output terminal via the reactor 14d and the diode 14a, and the reactor 14d becomes a back electromotive force as the current decreases. By releasing electromagnetic energy, the voltage due to the back electromotive force is combined with the input voltage. The boosting amount in the fuel cell boost converter 14 is controlled by controlling the switching (chopping) interval between conduction and cutoff of the switching element 14b.

  Each of the input smoothing capacitor 13 and the output smoothing capacitor 15 in FIG. 1 is an electronic component for smoothing current. The input smoothing capacitor 13 is connected as an arm between the input terminal pair of the fuel cell boost converter 14, and the output smoothing capacitor 15 is connected as an arm between the output terminal pair of the fuel cell boost converter 14.

<Configuration of second electric circuit>
The second electric circuit includes a secondary battery (BAT) 21, a voltage sensor 22, a first smoothing capacitor 23, a bidirectional buck-boost converter 24, a second smoothing capacitor 25, and a switch 26. Is mainly included.

  As is well known, the secondary battery 21 is a power storage device that can freely charge and discharge DC power, and includes a pair of terminals for input and output.

  The bidirectional step-up / down converter 24 is a DC voltage converter for outputting while increasing the DC power input in the power running direction or outputting the DC power input in the regeneration direction while decreasing the DC power. The terminal pairs on the input side in the power running direction are each connected to the terminal pair of the secondary battery 21, and the terminal pairs on the output side in the power running direction are each connected to the terminal pair for input / output in the load circuit 30. Has been.

The bidirectional buck-boost converter 24 employs, for example, an internal configuration as shown in FIG. The bidirectional buck-boost converter 24 of FIG. 3 includes two switching elements 24a and 24b on a first arm that connects a terminal pair on the input side (a terminal pair on the left side in the figure) in the power running direction. The second arm that connects the terminal pair on the output side (the terminal pair on the right side in the figure) in the power running direction is also provided with two switching elements 24c and 24d. All of these four switching elements 24a to 24d are oriented in the forward direction in the direction in which electricity flows from the positive side (upper side in the figure) to the negative side (lower side in the figure). Further, diodes 24e to 24h are connected in parallel to these four switching elements 24a to 24d, respectively, and these four diodes 24e to 24h are also in a reverse polarity state. Further, the midpoint between the two switching elements 24a and 24b in the first arm is connected to the midpoint between the two switching elements 24c and 24d in the second arm via the reactor 24i. ing. Therefore, the bidirectional buck-boost converter 24 illustrated in FIG. 3 is a case where a voltage is applied to a terminal pair on the input side in the power running direction (a terminal pair on the left side in the figure), and the switching element 24a is conductive. When the two switching elements 24b and 24c are in the cut-off state, the circuit configuration is equivalent to the fuel cell boost converter 14 illustrated in FIG. For this reason, the boosting amount in the power running direction by the bidirectional buck-boost converter 24 is controlled by controlling the switching (chopping) interval between conduction and cutoff of the switching element 24d. On the other hand, when a voltage is applied to the terminal pair (the terminal pair on the right side in the figure) on the input side in the regeneration direction, and two switching elements 24a and 24d are in the cut-off state, two When both of the switching elements 24b and 24c become conductive, electricity flows through the two switching elements 24b and 24c, and electromagnetic energy is accumulated in the reactor 24i. Conversely, the two switching elements 24b and 24c are both cut off. When the state is reached, the reactor 24i emits electromagnetic energy as a counter electromotive force as the current decreases, whereby a voltage due to the counter electromotive force is applied to the output terminal pair (terminal pair on the right side in the figure). In other words, in the regeneration direction, the switching (chopping) interval between conduction and cutoff of the two switching elements 24b and 24c is controlled, so that the step-down amount in the regeneration direction by the bidirectional buck-boost converter 24 (regenerative power is reduced). The amount to be controlled).

  In the first embodiment, the bidirectional buck-boost converter 24 constitutes one module component together with a protection circuit that detects an overtemperature, an overcurrent, an overvoltage, etc., and performs an external notification or a drive stop. This module component is called an IPM [Intelligent Power Module] or a power IC [Integrated Circuit].

  Each of the first and second smoothing capacitors 23 and 25 in FIG. 1 is an electronic component for smoothing current. The first smoothing capacitor 23 is connected as an arm between a pair of terminals on the secondary battery 21 side in the bidirectional buck-boost converter 24, and the second smoothing capacitor 25 is on the load circuit 30 side in the bidirectional buck-boost converter 24. Is connected as an arm between a pair of terminals.

The voltage sensor 22 is an electronic component for detecting the voltage V _BAT applied between the output terminal pair of the secondary battery 21.

  The switch 26 is an electronic component for switching between short circuit and open circuit, and is disposed on a bypass circuit that connects the positive electrodes of the terminal pairs on both sides of the bidirectional buck-boost converter 24.

<Control entity>
The power supply system of the first embodiment is controlled by an ECU (Electoronic control unit) 40 of a fuel cell vehicle equipped with the system. The ECU 40 is a unit for controlling an engine, an ABS (Antilock Brake System), an air conditioner, and the like based on information from various sensors in the vehicle. Although not shown, an I / O [Input / Output] interface is provided. And EEPROM [Electronically Erasable and Programmable Read Only Memory
], A CPU [Central Processing Unit], and a RAM [Random Access Memory].

Specifically, the ECU 40 controls the switching of the fuel cell boost converter 14 based on the voltage V _LOAD between the terminal pairs of the load circuit 30 as a function for controlling the power supply system of the first embodiment. A function for controlling switching of the bidirectional buck-boost converter 24 based on the voltage V _LOAD during power running, a function for controlling switching of the bidirectional buck-boost converter 24 based on the voltage V _BAT during regeneration, and a load circuit 30 And a function for controlling the operation of the switch 26 in the second electric circuit 20. Among these, the function of controlling the operation of the switch 26 in the second electric circuit 20 is realized by the switch control program 41, for example.

The switch control program 41 is generated from an EEPROM (not shown) by a CPU (not shown) triggered by, for example, an ignition signal being switched from an off state to an on state by rotating an ignition key cylinder (not shown) in a fuel automobile. It is read and executed.

<< Control details >>
FIG. 4 is a diagram illustrating a flow of switch control processing executed by the ECU 40 (internal CPU) in accordance with the switch control program 41.

In the first step S <b> 101 after the start of the switch control process, the ECU 40 (internal CPU) acquires the voltage V _LOAD applied between the terminal pair of the load circuit 30 from the voltage sensor 34.

In the next step S102, the ECU 40 determines whether or not the voltage V _LOAD acquired in step S101 exceeds a predetermined threshold value V _LIM . If the voltage V _LOAD does not exceed the predetermined threshold value V _LIM , the ECU 40 performs steps S102 to S10.
The process branches to 3.

  In step S <b> 103, the ECU 40 determines whether or not a failure occurrence notification has been received from the protection circuit constituting the module component together with the bidirectional buck-boost converter 24. If there is no failure occurrence notification, the ECU 40 branches the process from step S103 and returns the process to step S101.

When the voltage V _LOAD exceeds a predetermined threshold value V _LIM or when a failure occurrence notification is received during the execution of the processing loop of steps S102 and S103, the ECU 40 performs step S102.
The process proceeds to 104.

  In step S104, the ECU 40 performs control to turn on the switch 26 in the second electric circuit 20.

  In the next step S105, the ECU 40 stands by until the function of controlling the inverter 32 (the ECU 40 that operates as the ECU 40) completes the process of stopping the regeneration. Then, when the function of controlling inverter 32 completes the process of stopping regeneration, ECU 40 proceeds with the process to step S106.

  In step S106, the ECU 40 performs control to open the switch 26 in the second electric circuit 20. Thereafter, the ECU 40 ends the switch control process according to FIG.

<< Action and effect >>
In the power supply system of the first embodiment, the ECU 40 notifies the occurrence of a failure from the voltage V _LOAD between the terminal pair of the load circuit 30 and the protection circuit constituting the module component together with the bidirectional buck-boost converter 24. The presence or absence is monitored (steps S101, S102; No, S103; No).

During this monitoring, when the voltage V _LOAD between the terminal pair of the load circuit 30 exceeds a predetermined threshold value V _LIM due to some factor, the ECU 40 performs control to turn on the switch 26 and perform bidirectional processing. The positive electrodes of the terminal pair on the secondary battery 21 side and the terminal pair on the load circuit 30 side of the step-up / down converter 24 are short-circuited (step S102; yes, S104). Then, the power stored between the terminal pair of the load circuit 30 and the regenerative power output from the load circuit 30 are charged in the secondary battery 21. Here, if the predetermined threshold value V _LIM is set to a sufficiently low value so as not to cause destruction of electronic components such as the load circuit 30 and the fuel cell boost converter 14, the terminal pair of the load circuit 30 is caused by some factor. Even if the voltage V _LOAD increases in the _meantime , the voltage V _LOAD does not become an overvoltage, and electronic components are not destroyed. That is, when the power supply system is configured as in the first embodiment, robustness (current maintenance capability against uncertain fluctuations) is improved.

  Further, even if the bidirectional buck-boost converter 24 breaks down during the monitoring described above, the ECU 40 performs control to turn on the switch 26 and the terminal on the secondary battery 21 side of the bidirectional buck-boost converter 24. The positive electrodes of the pair and the terminal pair on the load circuit 30 side are short-circuited (step S103; yes, S104). As a result, even if the regenerative power is output from the load circuit 30 while the bidirectional buck-boost converter 24 is malfunctioning, the regenerative power is charged to the secondary battery 21 through the bypass circuit, and the load No overvoltage is applied between the terminal pair of the circuit 30. As a result, the electronic components such as the load circuit 30 and the fuel cell boost converter 14 are not destroyed. Therefore, the robustness of the power supply system is improved against a failure of the bidirectional buck-boost converter 24.

  In the first embodiment described above, the fuel cell boost converter 14 is provided between the fuel cell 11 and the load circuit 30, but the fuel cell boost converter 14 may be omitted. However, in order to prevent regenerative electricity from the load circuit 30 from flowing into the fuel cell 11, the direction toward the load circuit 30 is between the positive electrode of the output terminal pair of the fuel cell 11 and the positive electrode of the terminal pair of the load circuit 30. Must be provided.

Embodiment 2

<< Configuration >>
FIG. 5 is a configuration diagram of a power supply system according to the second embodiment.

  As is clear by comparing FIG. 5 and FIG. 1, the second embodiment is different from the first embodiment in that the switch 26 is not provided in the second electric circuit 20. Regarding the configuration of the electronic component other than the difference, the second embodiment is the same as the first embodiment.

In the second embodiment, the content of the processing executed by the ECU 40 is slightly different with the absence of the switch 26. Briefly, instead of the switch control program 41 in the first embodiment, the ECU 40 is a bidirectional buck-boost converter when the voltage V _LOAD between the electronic pair of the load circuit 30 exceeds a predetermined threshold value V _LIM. The converter control program 42 for controlling 24 is provided.

<< Control details >>
FIG. 6 is a diagram showing a flow of converter control processing executed by the ECU 40 (internal CPU) in accordance with the converter control program 42.

In the first step S201 after the start of the converter control process, the ECU 40 (internal CPU) acquires the voltage V _LOAD applied between the terminal pair of the load circuit 30 from the voltage sensor 34.

In the next step S202, the ECU 40 determines whether or not the voltage V _LOAD acquired in step S201 exceeds a predetermined threshold value V _LIM . If the voltage V _LOAD does not exceed the predetermined threshold value V _LIM , the ECU 40 branches the process from step S202 and returns the process to step S201. On the other hand, if the voltage V _LOAD exceeds the predetermined threshold value V _LIM , the ECU 40 advances the process from step S202 to step S203.

In step S203, the ECU 40 interrupts the switching control in the bidirectional buck-boost converter 24, and the positive-side switching element 24a of the first arm and the positive-side switching element 24c of the second arm in the bidirectional buck-boost converter 24. Are turned on and the remaining switching elements 24b and 24d are turned off (see FIG. 3). Thereby, the positive electrodes of the terminal pair on the secondary battery 21 side and the terminal pair on the load circuit 30 side of the bidirectional buck-boost converter 24 are short-circuited.

  In the next step S204, the ECU 40 stands by until the function of controlling the inverter 32 (the ECU 40 that operates as the ECU 40) completes the process of stopping the regeneration. Then, when the function of controlling inverter 32 completes the process of stopping regeneration, ECU 40 advances the process to step S205.

  In step S205, the ECU 40 resumes switching control in the bidirectional buck-boost converter 24. Thereafter, the ECU 40 ends the converter control process according to FIG.

<< Action and effect >>
In the power supply system of the second embodiment, the ECU 40 monitors the voltage V _LOAD between the terminal pairs of the load circuit 30 (steps S201 and S202; No).

During this monitoring, if the voltage V _LOAD between the terminal pair of the load circuit 30 exceeds a predetermined threshold value V _LIM due to some factor, the ECU 40 causes the bidirectional buck-boost converter 24 to operate.
The positive electrodes in the terminal pairs on both sides are short-circuited (step S202; yes, S203). Then, the power stored between the terminal pair of the load circuit 30 and the regenerative power output from the load circuit 30 are charged in the secondary battery 21. Here, if the predetermined threshold value V _LIM is set to a sufficiently low value so as not to cause destruction of the electronic components such as the load circuit 30 and the fuel cell boost converter 14 as in the first embodiment, some factor Thus, even if the voltage V _LOAD between the terminal pair of the load circuit 30 rises, the voltage V _LOAD does not become an overvoltage, and electronic components are not destroyed. That is, even if the power supply system is configured as in the second embodiment, the robustness is improved.

Configuration diagram of the power supply system of the first embodiment The figure which shows an example of the internal structure of a fuel cell boost converter The figure which shows an example of an internal structure of a bidirectional | two-way buck-boost converter Diagram showing the flow of switch control processing Configuration diagram of power supply system of second embodiment Diagram showing the flow of converter control processing

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Fuel cell 13 Input smoothing capacitor 14 Fuel cell boost converter 15 Output smoothing capacitor 21 Secondary battery 23 Smoothing capacitor 24 Bidirectional buck-boost converter 24a Switching element 24c Switching element 25 Smoothing capacitor 26 Switch 30 Load circuit 31 AC motor 32 Inverter 33 Electric equipment Product 34 Voltage sensor 40 ECU
41 Switch control program 42 Converter control program

Claims (6)

A power source for controlling a power supply mode between a fuel cell that outputs DC power and a load circuit that is a supply destination of the DC power, and between a chargeable / dischargeable secondary battery and the load circuit. A control system,
A bidirectional voltage converter for converting a voltage of powering power or regenerative power between the secondary battery and the load circuit;
A switch disposed on a bypass circuit that connects positive electrodes of the input terminal pair and the output terminal pair of the bidirectional voltage converter; and
A power supply control system comprising: a control unit that performs control to turn on the switch when a voltage between a pair of input and output terminals of the load circuit exceeds a predetermined threshold value. A power source for controlling a power supply mode between a fuel cell that outputs DC power and a load circuit that is a supply destination of the DC power, and between a chargeable / dischargeable secondary battery and the load circuit. A control system,
A bidirectional voltage converter for converting a voltage of powering power or regenerative power between the secondary battery and the load circuit;
A switch disposed on a bypass circuit that connects positive electrodes of the input terminal pair and the output terminal pair of the bidirectional voltage converter; and
A power supply control system comprising: a control unit that performs control to turn on the switch when the bidirectional voltage converter fails. The bidirectional voltage converter has a function of notifying the control unit to that effect when a self-failure is detected,
The power supply control system according to claim 2, wherein the control unit performs control to turn on the switch when the bidirectional voltage converter is notified that a failure has been detected. The load circuit includes an AC motor for supplying a rotational force to an axle of a fuel cell vehicle, and an orthogonal motor for converting DC power from the fuel cell and the secondary battery into AC power and supplying the AC power to the AC motor. Including a converter,
The said control part controls the said orthogonal converter so that the output of the regenerative electric power by the said motor is stopped after throwing in the said switch, Then, the said switch is open | released. Or the power supply control system of 3. A power source for controlling a power supply mode between a fuel cell that outputs DC power and a load circuit that is a supply destination of the DC power, and between a chargeable / dischargeable secondary battery and the load circuit. A control system,
A bidirectional voltage converter for converting a voltage of powering power or regenerative power between the secondary battery and the load circuit; and
When the voltage between the input / output terminal pair of the load circuit exceeds a predetermined threshold, the bidirectional voltage converter is configured to short-circuit the positive electrodes of the input terminal pair and the output terminal pair of the bidirectional voltage converter. A power supply control system comprising a control unit for controlling the power supply. The load circuit includes an AC motor for supplying a rotational force to an axle of a fuel cell vehicle, and an orthogonal motor for converting DC power from the fuel cell and the secondary battery into AC power and supplying the AC power to the AC motor. Including a converter,
The control unit, after short-circuiting the positive electrodes of the input terminal pair and the output terminal pair of the bidirectional voltage converter, after controlling the orthogonal converter so that the output of the regenerative power by the motor is stopped, The power supply control system according to claim 5, wherein the positive electrodes are opened.

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