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 in-vehicle temperature detection circuit includes a temperature detecting unit including a plurality of individual detecting units, each having a first resistor and a temperature detecting element connected in series between a first conductive path to which a predetermined source voltage is applied and a reference conductive path. A plurality of bipolar transistors are connected to a corresponding individual detecting units. A second conductive path is electrically connected to each of emitters of the bipolar transistors. In each bipolar transistor, a base is electrically connected to a third conductive path between the first resistor and the temperature detecting element of the individual detecting unit corresponding to the bipolar transistor. A voltage reflecting the lowest voltage among the voltages applied to the third conductive paths in the plurality of individual detecting units is applied to the second conductive path.

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: Provided is a configuration that can detect the internal resistance of a power storage unit. An internal resistance detection device includes a DC-DC converter that is configured to raise the output voltage to a target voltage by performing constant current operation in which the charging current is output at a target charging current, and, when the output voltage reaches the target voltage, to control power such that the charging current is lowered by performing constant voltage operation in which the output voltage is fixed at the target voltage. A control unit detects the internal resistance of a power storage unit based on a target charging current Ichg during constant current operation by the DC-DC converter, a drop time, which is the time that passes from when constant voltage operation starts to when the charging current drops to a predetermined current value, and a capacity of the power storage unit.

Abstract: The present disclosure realizes a configuration capable of setting and changing the value of a voltage that is output from a voltage regulator, while suppressing an increase in the size of an apparatus and keeping the apparatus from being complex. A control unit of a voltage regulator operates to switch a state of each port to either a first state or a second state. An input circuit unit applies a voltage corresponding to the combination of the first states at the ports to the base of a transistor. Electricity flows through the transistor when at least one of the ports is in the first state. A switch is turned on when electricity flows through the transistor. A Zener diode sets an output voltage applied to a second conductive path to a voltage corresponding to a voltage applied to the base of the transistor.

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 configuration can be more easily realized in which the temperature of an auxiliary power source can be increased even in a low temperature environment. In the in-vehicle auxiliary power source control device, a control unit performs a charging operation of switching a first switch on and switching a second switch off, and a discharging operation of switching the first switch off and switching the second switch on. Also, the temperature of an auxiliary power source is raised by heat generated by a resistor unit due to the charging operation and the discharging operation performed by the control unit.

Abstract: A voltage regulator is provided wherein electricity flows through a second transistor in an operating state in which a control unit) applies an operating voltage to a base of the second transistor. A Zener diode sets, in the operating state, a voltage of a second conductive path to a voltage corresponding to a voltage across the Zener diode. A current corresponding to an addition value obtained by adding a value of a current flowing through a second resistor portion in the operating state, a value of a current flowing through a third resistor portion in the operating state, and a value of a current flowing through the Zener diode in the operating state flows through a ground-side resistor portion. A control unit stops the output of the operating voltage when a voltage of the second conductive path is lower than or equal to 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: In a voltage detection circuit, if a driving signal is provided from a control circuit to a drive target circuit that is one of a plurality of individual detection circuits, and a non-driving signal is provided from the control circuit to the other non-target circuits, switch portions of the non-target circuits are turned off to prevent a current from flowing through first transistors and second transistors of the non-target circuits, whereby generation of the output voltages in the non-target circuits is stopped, and a switch portion of the drive target circuit is turned on so as to allow a current to flow through a first transistor and a second transistor of the drive target circuit, whereby a voltage according to a voltage across both ends of an electricity storage cell corresponding to the drive target circuit is applied to an output conductive path.

Abstract: An increase in the capacity of a power storage unit is effectively suppressed. An in-vehicle backup power source control apparatus includes a discharge unit, a control unit, and a temperature obtaining unit. The control unit controls a discharge operation such that an output voltage of the discharge unit reaches a target voltage. The temperature obtaining unit obtains the temperature of a power storage unit. When the temperature obtained by the temperature obtaining unit is within a predetermined first temperature range, the control unit sets the target voltage to a first target voltage, and when the temperature obtained by the temperature obtaining unit is within a predetermined second temperature range that is higher than the first temperature range, the control unit sets the target voltage to a second target voltage that is higher than first target voltage.

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 voltage regulator is provided wherein electricity flows through a second transistor in an operating state in which a control unit) applies an operating voltage to a base of the second transistor. A Zener diode sets, in the operating state, a voltage of a second conductive path to a voltage corresponding to a voltage across the Zener diode. A current corresponding to an addition value obtained by adding a value of a current flowing through a second resistor portion in the operating state, a value of a current flowing through a third resistor portion in the operating state, and a value of a current flowing through the Zener diode in the operating state flows through a ground-side resistor portion. A control unit stops the output of the operating voltage when a voltage of the second conductive path is lower than or equal to a threshold value.

Abstract: The present disclosure realizes a configuration capable of setting and changing the value of a voltage that is output from a voltage regulator, while suppressing an increase in the size of an apparatus and keeping the apparatus from being complex. A control unit of a voltage regulator operates to switch a state of each port to either a first state or a second state. An input circuit unit applies a voltage corresponding to the combination of the first states at the ports to the base of a transistor. Electricity flows through the transistor when at least one of the ports is in the first state. A switch is turned on when electricity flows through the transistor. A Zener diode sets an output voltage applied to a second conductive path to a voltage corresponding to a voltage applied to the base of the transistor.

Abstract: A configuration with which, even if the supply of power from a power supply portion ceases, the power from another power supply source can be instantly supplied to a power supply target is more easily achieved. In a backup circuit, a control unit causes a second voltage conversion portion to perform a voltage conversion operation in response to satisfaction of a predetermined first backup condition, and a power supply portion-side conductive path and an electricity storage portion-side conductive path are electrically connected to each other via a resistive portion when the control unit is causing the second voltage conversion portion to perform the voltage conversion operation. Furthermore, the control unit causes the first voltage conversion portion to perform a second operation in response to a predetermined second backup condition being satisfied when the control unit is causing the second voltage conversion portion to perform the voltage conversion operation.

Abstract: An in-vehicle temperature detection circuit includes a temperature detecting unit including a plurality of individual detecting units, each having a first resistor and a temperature detecting element connected in series between a first conductive path to which a predetermined source voltage is applied and a reference conductive path. A plurality of bipolar transistors are connected to a corresponding individual detecting units. A second conductive path is electrically connected to each of emitters of the bipolar transistors. In each bipolar transistor, a base is electrically connected to a third conductive path between the first resistor and the temperature detecting element of the individual detecting unit corresponding to the bipolar transistor. A voltage reflecting the lowest voltage among the voltages applied to the third conductive paths in the plurality of individual detecting units is applied to the second conductive path.

Abstract: An increase in the capacity of a power storage unit is effectively suppressed. An in-vehicle backup power source control apparatus includes a discharge unit, a control unit, and a temperature obtaining unit. The control unit controls a discharge operation such that an output voltage of the discharge unit reaches a target voltage. The temperature obtaining unit obtains the temperature of a power storage unit. When the temperature obtained by the temperature obtaining unit is within a predetermined first temperature range, the control unit sets the target voltage to a first target voltage, and when the temperature obtained by the temperature obtaining unit is within a predetermined second temperature range that is higher than the first temperature range, the control unit sets the target voltage to a second target voltage that is higher than first target voltage.

Abstract: Provided is a configuration that can detect the internal resistance of a power storage unit. An internal resistance detection device includes a DC-DC converter that is configured to raise the output voltage to a target voltage by performing constant current operation in which the charging current is output at a target charging current, and, when the output voltage reaches the target voltage, to control power such that the charging current is lowered by performing constant voltage operation in which the output voltage is fixed at the target voltage. A control unit detects the internal resistance of a power storage unit based on a target charging current Ichg during constant current operation by the DC-DC converter, a drop time, which is the time that passes from when constant voltage operation starts to when the charging current drops to a predetermined current value, and a capacity of the power storage unit.

Abstract: A configuration with which, even if the supply of power from a power supply portion ceases, the power from another power supply source can be instantly supplied to a power supply target is more easily achieved. In a backup circuit, a control unit causes a second voltage conversion portion to perform a voltage conversion operation in response to satisfaction of a predetermined first backup condition, and a power supply portion-side conductive path and an electricity storage portion-side conductive path are electrically connected to each other via a resistive portion when the control unit is causing the second voltage conversion portion to perform the voltage conversion operation. Furthermore, the control unit causes the first voltage conversion portion to perform a second operation in response to a predetermined second backup condition being satisfied when the control unit is causing the second voltage conversion portion to perform the voltage conversion operation.