Abstract: In a power supply device, switching section switch a connection between batteries to a series connection or a parallel connection. In a case where the connection between the batteries is switched from the series connection to the parallel connection to charge the batteries by as external charger, a controller does not switch the connection to the parallel connection, does not charge one battery having a larger voltage out of the batteries, and separately charges the other battery when a potential difference between a voltage of the battery and a voltage of the battery is a predetermined threshold value or higher; and the controller switches the connection to the parallel connection and charges the batteries when the potential difference is lower than the threshold value.

Abstract: A wire harness unit applied to a power storage device unit and a wire harness includes a routing material and a cooling unit that cools the routing material. The routing material constitutes a charging conduction path that extends between a charging inlet and a power storage device, and transmits electricity. The charging inlet is provided to a vehicle. The power storage device is provided to the vehicle and can store electric power. As a result, the wire harness unit, the power storage device unit, and the wire harness can reduce a cross-sectional area of the routing material to a relatively small area, thereby having an advantageous effect of capable of having proper mountability.

Abstract: In a power supply system, a charge switching unit is relays switchable between a series circuit that connects a first high-voltage battery to a second high-voltage battery in series and a parallel circuit that connects the first high-voltage battery to the second high-voltage battery in parallel. If an input voltage is a first voltage (for example, approximately 400 V), a controller controls the charge switching unit to form the parallel circuit, and charges the first and second high-voltage batteries with power supplied from a quick charger. If the input voltage is a second voltage (for example, approximately 800 V) higher than the first voltage (for example, approximately 400 V), the controller controls the charge switching unit to form the series circuit, and charges the first and second high-voltage batteries with power supplied from a super-quick charger.

Abstract: In a bridge circuit, a series circuit in which a first resistor and a second resistor are connected in series and the second resistor and a fourth resistor are connected in series is formed. In the bridge circuit, the series circuit is connected to a load portion in parallel, one end of a fifth resistor is connected between the second resistor and the fourth resistor, and the other end of the fifth resistor is connected between the first resistor and the load portion. In the bridge circuit, a voltage supply unit is connected between the first resistor and the second resistor. A controller detects an abnormality of the load portion based on a detection voltage of the bridge circuit detected by applying a voltage from the voltage supply unit with a switch turned off. With this configuration, an abnormality detection device can detect abnormality while suppressing an increase in size.

Abstract: A current detection device includes a current sensor and a controller. The current sensor outputs a detection voltage according to a conduction current flowing through a bi-directional circuit in which current is capable of flowing in a positive direction and a negative direction that is a direction opposite to the positive direction. The controller calculates the conduction current based on the detection voltage output from the current sensor. For example, the controller calculates the conduction current based on an absolute value of a difference between a reference voltage that is the detection voltage output during a non-conductive state in which current is not flowing through the bi-directional circuit, and the detection voltage output during a conductive state in which current is flowing through the bi-directional circuit.

Abstract: A sensor unit includes a current sensor that detects a current, a voltage sensor that detects a voltage, a ground fault sensor that detects a ground fault, and a common substrate on which the current sensor, the voltage sensor, and the ground fault sensor are mounted. In the sensor unit, for example, in a power supply circuit of a vehicle, the three sensors of the high voltage system can be integrated on the common substrate, so that an increase in the number of parts can be suppressed.

Abstract: In a power supply device, a battery switching unit is a circuit capable of switching a series-connected relay, a parallel-connected relay, a parallel-connected relay, and a parallel-connected relay to switch to a series circuit connecting a first battery and a second battery in series or a parallel circuit connecting the first battery and the second battery in parallel. When charging the first battery and the second battery, a controller controls the battery switching unit to switch to a parallel circuit, controls the parallel-connected relay based on voltages applied to a first cathode terminal and a first anode terminal, and further controls the parallel-connected relay based on voltages applied to a second cathode terminal and a second anode terminal.

Abstract: A heat dissipation structure includes a heat dissipation portion and a heat storage portion. The heat dissipation portion has the heat receiving surface including the contact surface in contact with the semiconductor generating the heat, and dissipates the heat of the semiconductor in contact with the contact surface. The heat storage portion is arranged to sandwich the semiconductor. The heat storage portion has, for example, the heat storage opening portion in which the semiconductor is positioned, and surrounds the semiconductor. The heat storage portion is provided to he in contact with the heat receiving surface, and stores the heat of the semiconductor conducted through the heat dissipation portion.

Abstract: In a vehicle power supply device, a switch unit switches mutual connection among first to fourth batteries. When supplying electric power from the first to fourth batteries to a motor, a switch controller controls the switch unit and forms a backup battery corresponding to at least one of the first to fourth batteries that does not supply electric power to the motor and a serial battery group for supplying electric power that has the remaining batteries, except for the backup battery, connected in series. The switch controller supplies electric power from the serial battery group for supplying electric power to the motor, and, when a predetermined condition is satisfied, sequentially switches between a battery included in the serial battery group for supplying electric power and the backup battery.

Abstract: A semiconductor-switch control device includes a controller that detects an analog signal of a load current, converts the detected analog signal into a digital signal, and determines an over-current based on the converted digital signal; a short circuit detector that detects an analog signal of a load voltage, and detects an over-current based on the analog signal without converting the detected analog signal into a digital signal; and a drive unit that drives an FET based on a determination result of the over-current determined by the controller or a detection result of the over-current detected by the short circuit detector.

Abstract: In a power-supply device, a FET passes or blocks a current flowing from one side in a power-supply circuit. A current sensor detects a current flowing into the FET. A FET is coupled to the FET, and passes or blocks a current flowing from another side in the power-supply circuit. A current sensor detects a current flowing into the FET. A junction couples a load unit at a point between the FET and the FET. In each of switch units, a CPU controls the corresponding switch unit of the power-supply circuit based on the detection result detected by the corresponding current sensors.

Abstract: The protection circuit unit includes an energization module disposed on an electric path between a high-voltage battery of a vehicle and a high-voltage load receiving supply of power from the high-voltage battery, to open and close the electric path, and a control board configured to be a member separated from the energization module and electrically connected with the energization module, to control opening and closing of the electric path. The energization module includes semiconductor switches opening and closing the electric path, and a control terminal connecting the semiconductor switches with the control board. The control board includes a connection unit corresponding to the control terminal of each of a plurality of types of the energization modules.

Abstract: An FET makes an upstream power supply circuit an energized state and makes the upstream power supply circuit an interrupted state. An FET makes a downstream power supply circuit an energized state and makes the downstream power supply circuit an interrupted state. An FET turns on to make an anode and a cathode of the capacitor an energized state, and turns off to make the anode and the cathode an interrupted state. A controller turns on the FET and the FET and turns off the FET to make a power supply circuit an energized state. When a certain discharge request is input in the energized state of the power supply circuit, the controller turns off the FET and turns on the FET and the FET. With this configuration, a semiconductor relay device can appropriately address the power supply circuit at the time of abnormality.

Abstract: A power source switch control device includes a detection circuit, a detection circuit, a detection circuit, and a detection circuit. The detection circuit detects forward voltage of a body diode of a FET, and the detection circuit detects forward voltage of a body diode of a FET. The detection circuit detects forward voltage of a body diode of a FET, and the detection circuit detects forward voltage of a body diode of a FET. A controller determines whether a defect of a power circuit has occurred based on results of the detection by the detection circuits to. Accordingly, the power source switch control device can appropriately detect defect of a switching element of a power source.

Abstract: A semiconductor module unit includes a semiconductor module, and a control board that includes a driver circuit configured to output drive signals to the semiconductor module and controls the semiconductor module. The control board includes a main board, a sub board that is separated from the main board and on which the driver circuit is mounted, and a flexible board that has flexibility and electrically connects the main board and the sub board. The sub board includes a fitting part that is fitted in a fitted part of the semiconductor module. The semiconductor module is electrically connected to the driver circuit in a state where the fitting part is fitted in the fitted part.

Abstract: In a power supply system, a charge switching unit is relays switchable between a series circuit that connects a first high-voltage battery to a second high-voltage battery in series and a parallel circuit that connects the first high-voltage battery to the second high-voltage battery in parallel. If an input voltage is a first voltage (for example, approximately 400 V), a controller controls the charge switching unit to form the parallel circuit, and charges the first and second high-voltage batteries with power supplied from a quick charger. If the input voltage is a second voltage (for example, approximately 800 V) higher than the first voltage (for example, approximately 400 V), the controller controls the charge switching unit to form the series circuit, and charges the first and second high-voltage batteries with power supplied from a super-quick charger.

Abstract: In a bridge circuit, a series circuit in which a first resistor and a second resistor are connected in series and the second resistor and a fourth resistor are connected in series is formed. In the bridge circuit, the series circuit is connected to a load portion in parallel, one end of a fifth resistor is connected between the second resistor and the fourth resistor, and the other end of the fifth resistor is connected between the first resistor and the load portion. In the bridge circuit, a voltage supply unit is connected between the first resistor and the second resistor. A controller detects an abnormality of the load portion based on a detection voltage of the bridge circuit detected by applying a voltage from the voltage supply unit with a switch turned off. With this configuration, an abnormality detection device can detect abnormality while suppressing an increase in size.

Abstract: A current detection device includes a current sensor and a controller. The current sensor outputs a detection voltage according to a conduction current flowing through a bi-directional circuit in which current is capable of flowing in a positive direction and a negative direction that is a direction opposite to the positive direction. The controller calculates the conduction current based on the detection voltage output from the current sensor. For example, the controller calculates the conduction current based on an absolute value of a difference between a reference voltage that is the detection voltage output during a non-conductive state in which current is not flowing through the bi-directional circuit, and the detection voltage output during a conductive state in which current is flowing through the bi-directional circuit.

Abstract: An abnormality detection device includes a first temperature detector, a power consumption calculator, a second temperature detector, and an abnormality determination unit. The first temperature detector detects a detection temperature of an FET that is mounted on a mounting surface of a substrate and that generates heat when energized. The power consumption calculator obtains power consumption of the FET. The second temperature detector detects a detection temperature of a heat sink that is provided on a side opposite to the mounting surface side of the substrate and that dissipates the heat generated in the FET. A controller determines an abnormality in a heat dissipation path P between the FET and the heat sink based on a thermal resistance determined according to the detection temperature detected by the first temperature detector, the detection temperature detected by the second temperature detector, and the power consumption obtained by the power consumption calculator.

Abstract: The semiconductor switch control device includes a first FET provided between an anode of a battery and a load and a second FET arranged between a cathode of the battery and the load, in which in a case where a current value that is larger than an abnormal current value indicating that a first drain current flowing through the first FET is an overcurrent and smaller than a maximum current value of the first drain current that can be tolerated by the first FET is set as a current limit value, a limiting gate voltage for setting the current value of the first drain current to a current limit value is applied to the second FET.