Abstract: A power supply apparatus includes a bypass circuit, a current conduction circuit, and an anomaly determination unit. The bypass circuit is provided in parallel to a first switching element, and includes a resistor portion, and a current flows therethrough from a power supply unit to a load via the resistor portion. The current conduction circuit is provided between a first conduction path, of a power path, between the bypass circuit and the load, and a second conduction path, which is grounded, and is configured such that, when in a current conduction state, a current flows from the first conduction path to the second conduction path. The anomaly determination unit performs anomaly determination based on a voltage drop at the resistor portion when the current conduction circuit is in the current conduction state.

Abstract: A power supply apparatus includes a first circuit, a second circuit, a control unit, and an anomaly determination unit. The first circuit includes a first resistor portion, and is provided in parallel to the first switching element. The second circuit is provided between a first conduction path and a second conduction path. The first circuit is configured such that a current flows from the power supply unit to the load via the first resistor portion. The second circuit is configured such that a current flows from the first conduction path to the second conduction path when in a current conduction state. The anomaly determination unit determines an anomaly based on a voltage of the first conduction path when the second circuit is in the current conduction state.

Abstract: An anomaly detection device for a power supply system includes: a first power supply unit; a second power supply unit; a first conductive path and a second conductive path for transmitting electric power between the first power supply unit and the second power supply unit; and a relay for controlling current through the first conductive path and the second conductive path. The anomaly detection device includes: a first voltage detector for detecting a first voltage on the first power supply unit side of the first and the second conductive paths relative to the relay; a second voltage detector for detecting a second voltage on the second power supply unit side of the first and second conductive paths relative to the relay; and a detector for detecting an anomaly based on the first voltage and the second voltage when the relay is in a cut-off state.

Abstract: In a semiconductor switch, a resistance value between a current input terminal to which a current is input and a current output terminal from which a current is output decreases as a voltage of a control terminal based on a potential of the current output terminal increases. A booster circuit is disposed on a path extending from the current input terminal to the control terminal. The booster circuit boosts a voltage input from the current input terminal side and applies the boosted voltage to the control terminal. A switch is connected between the control terminal and the current output terminal of the semiconductor switch. The switch is switched off by power consumption. The power consumption stops and the switch switches on if the supply of power to the booster circuit stops.

Abstract: In a semiconductor switch, a resistance value between a current input terminal to which a current is input and a current output terminal from which a current is output decreases as a voltage of a control terminal based on a potential of the current output terminal increases. A booster circuit is disposed on a path extending from the current input terminal to the control terminal. The booster circuit boosts a voltage input from the current input terminal side and applies the boosted voltage to the control terminal. A switch is connected between the control terminal and the current output terminal of the semiconductor switch. The switch is switched off by power consumption. The power consumption stops and the switch switches on if the supply of power to the booster circuit stops.

Abstract: A current control device includes a constant current circuit and a current adjustment device. The current adjustment device applies a voltage to the constant current circuit. The constant current circuit draws a constant current according to the applied voltage. The micon sets a value of the constant current drawn by the constant current circuit, adjusts the voltage applied to the constant current circuit by the current adjustment device to a voltage according to the set value that is set. The micon adjusts the voltage being applied by the current adjustment device to the constant current circuit based on the difference value between the constant current drawn by the constant current circuit and the set value.

Abstract: A drive device is a drive device for driving a first switching element. The drive device includes a protection switch. The protection switch is provided between a first terminal and a third terminal of the first switching element, turned off when a voltage of the third terminal is a second threshold or more, and turned on when the voltage of the third terminal is less than the second threshold. A potential difference between the first terminal and the third terminal is less than a first threshold when the protection switch is on.

Abstract: A control device for a vehicle includes a semiconductor switch, and opens and closes a connection between a capacitor connected to one end of the semiconductor switch and an on-board battery connected to another end of the semiconductor switch by turning ON/OFF the semiconductor switch. The control device includes: a wiring for applying a drive voltage for turning ON the semiconductor switch; a drive switch for short-circuiting the wiring to turn OFF the semiconductor switch; a Zener diode having an anode connected to the one end of the switching circuit, and a cathode connected to the wiring; a voltage detection unit detects a voltage at the one end of the switching circuit; and a control unit that controls the drive switch from OFF to ON, and determines whether or not the semiconductor switch is defective by comparing the voltage detected by the voltage detection unit with a threshold value.

Abstract: In a semiconductor switch, a resistance value between a current input terminal to which a current is input and a current output terminal from which a current is output decreases as a voltage of a control terminal based on a potential of the current output terminal increases. A booster circuit is disposed on a path extending from the current input terminal to the control terminal. The booster circuit boosts a voltage input from the current input terminal side and applies the boosted voltage to the control terminal. A switch is connected between the control terminal and the current output terminal of the semiconductor switch. The switch is switched off by power consumption. The power consumption stops and the switch switches on if the supply of power to the booster circuit stops.

Abstract: An output device outputs a current through a semiconductor switch. With regard to the semiconductor switch, a resistance value between a current receiving terminal for receiving a current and a current output terminal for outputting a current decreases as the voltage at a control terminal rises. A first diode is disposed in a first path extending from the current receiving terminal to the control terminal. The voltage at the current receiving terminal is applied to the control terminal of the semiconductor switch via the first diode. A booster circuit is disposed in a second path extending from the current receiving terminal to the control terminal. The booster circuit boosts the voltage that is received from the current receiving terminal, and applies the boosted voltage to the control terminal.

Abstract: A control device for a vehicle includes a semiconductor switch, and opens and closes a connection between a capacitor connected to one end of the semiconductor switch and an on-board battery connected to another end of the semiconductor switch by turning ON/OFF the semiconductor switch. The control device includes: a wiring for applying a drive voltage for turning ON the semiconductor switch; a drive switch for short-circuiting the wiring to turn OFF the semiconductor switch; a Zener diode having an anode connected to the one end of the switching circuit, and a cathode connected to the wiring; a voltage detection unit detects a voltage at the one end of the switching circuit; and a control unit that controls the drive switch from OFF to ON, and determines whether or not the semiconductor switch is defective by comparing the voltage detected by the voltage detection unit with a threshold value.

Abstract: An output device outputs a DC voltage applied between a first terminal and a second terminal via the drain and the source of a semiconductor switch. The output device includes a conversion circuit configured to convert the DC voltage into a voltage of a predetermined polarity, irrespective of the polarity of the DC voltage. A booster circuit boosts the voltage that was converted by the conversion circuit and applies the boosted voltage to the gate of the semiconductor switch. The semiconductor switch is on if the voltage of the control terminal with respect to the potential of the first terminal is at least a predetermined voltage.

Abstract: In a power supply control device, when the connection of a battery is a normal connection, and a bypass switch is off, a current flows through a first switching circuit and a diode in that order. When the connection of the battery is a normal connection, and an output voltage of the battery drops below a reference voltage, a second switching circuit switches the bypass switch from off to on.

Abstract: Provided is a power supply control device. The power supply control device includes a plurality of semiconductor switches that are connected in parallel between two power sources and control the supply of power to a load that is connected to the two power sources via the plurality of semiconductor switches, the power supply control device including a temperature detection unit that detects a rise of temperature due to heat that is produced from at least one of the plurality of semiconductor switches, and a switching control unit that executes control that switches the plurality of semiconductor switches from OFF to ON if the temperature detection unit detects a temperature that is at least a threshold temperature.

Abstract: A power supply control apparatus controls power supply via a semiconductor switch, by a driving circuit turning ON or OFF the semiconductor switch. A current circuit pulls in a current from the drain of the semiconductor switch via a resistance. The current value Ic of the current that is pulled in by the current circuit fluctuates in the same direction as a fluctuation direction of the ON resistance value of the semiconductor switch, depending on the ambient temperature of the semiconductor switch. If the source voltage of the semiconductor switch is lower than a voltage at the other end of the resistance, the driving circuit turns OFF the semiconductor switch.

Abstract: An output device outputs a DC voltage applied between a first terminal and a second terminal via the drain and the source of a semiconductor switch. The output device includes a conversion circuit configured to convert the DC voltage into a voltage of a predetermined polarity, irrespective of the polarity of the DC voltage. A booster circuit boosts the voltage that was converted by the conversion circuit and applies the boosted voltage to the gate of the semiconductor switch. The semiconductor switch is on if the voltage of the control terminal with respect to the potential of the first terminal is at least a predetermined voltage.

Abstract: Provided is a power supply device configured to diagnose circuit operation, and identify, if a defect is found in the diagnosis, the circuit component that is the cause. The power supply device includes: a switch that is disposed in a power supply path leading from a main power source to a load, and is configured to bring into conduction and interrupt the power supply path; a downstream sensing means for sensing a power supply state of a load-side power supply path between the switch and the load; a comparing means for comparing a downstream voltage of the load-side power supply path, with a predetermined threshold voltage; and a control unit. The control unit includes: a switch control means for turning the switch on/off; and a conduction determination means for determining whether the switch is in an ON or OFF state based on the output of the downstream sensing means.

Abstract: Provided is a power supply control device. The power supply control device includes a plurality of semiconductor switches that are connected in parallel between two power sources and control the supply of power to a load that is connected to the two power sources via the plurality of semiconductor switches, the power supply control device including a temperature detection unit that detects a rise of temperature due to heat that is produced from at least one of the plurality of semiconductor switches, and a switching control unit that executes control that switches the plurality of semiconductor switches from OFF to ON if the temperature detection unit detects a temperature that is at least a threshold temperature.

Abstract: A power supply control apparatus controls power supply via a semiconductor switch, by a driving circuit turning ON or OFF the semiconductor switch. A current circuit pulls in a current from the drain of the semiconductor switch via a resistance. The current value Ic of the current that is pulled in by the current circuit fluctuates in the same direction as a fluctuation direction of the ON resistance value of the semiconductor switch, depending on the ambient temperature of the semiconductor switch. If the source voltage of the semiconductor switch is lower than a voltage at the other end of the resistance, the driving circuit turns OFF the semiconductor switch.

Abstract: Provided is a power supply device configured to diagnose circuit operation, and identify, if a defect is found in the diagnosis, the circuit component that is the cause. The power supply device includes: a switch that is disposed in a power supply path leading from a main power source to a load, and is configured to bring into conduction and interrupt the power supply path; a downstream sensing means for sensing a power supply state of a load-side power supply path between the switch and the load; a comparing means for comparing a downstream voltage of the load-side power supply path, with a predetermined threshold voltage; and a control unit. The control unit includes: a switch control means for turning the switch on/off; and a conduction determination means for determining whether the switch is in an ON or OFF state based on the output of the downstream sensing means.