Abstract: A DC/DC converter includes: electronic components group including a first capacitor, a high-voltage-side switching element, a low-voltage-side switching element, an inductor, and a second capacitor and constituting a half-bridge circuit; and a substrate including a high-voltage region, a low-voltage region, a connection region, and a pair of ground regions. The first capacitor is mounted across one of the ground regions and the high-voltage region. The high-voltage-side switching element is mounted across the high-voltage region and the connection region. The low-voltage-side switching element is mounted across the connection region and one of the ground regions. The inductor is mounted across the connection region and the low-voltage region. The second capacitor is mounted across the low-voltage region and one of the ground regions.

Abstract: A power supply system includes; a first switch connected between a main power source and loads; a second switch connected between a sub-battery and the loads; and backflow prevention circuit that prevent current backflow between the main power source and the sub-battery, and polarity of the backflow prevention circuit is devised so as to allow current passage in a direction from the sub-power source to the loads even when the second switch is in an off state. When power from the main power source is interrupted, the power source power of the sub-power source is supplied to the loads via the backflow prevention circuit even the second switch remains in the off state, so that the power supply is not interrupted.

Abstract: Provided is a voltage converting unit including: a voltage converter capable of bidirectionally supplying electrical power between a first power system and a second power system; and a bypass switch disposed in parallel to the voltage converter. The voltage converter includes: a detector detecting a difference in voltage between the first power system and the second power system; and a switch controller controlling switching of the bypass switch on the basis of the difference in voltage in accordance with a predetermined rule.

Abstract: A charging and discharging control device of an electric double-layer capacitor, the charging and discharging control device includes a charging circuit receiving power supply from an external power supply and charging the electric double-layer capacitor, a discharging circuit discharging the electric double-layer capacitor, and a control circuit controlling the charging circuit and the discharging circuit to alternately repeat the charge and the discharge of the electric double-layer capacitor when temperature of the electric double-layer capacitor is equal to or lower than a predetermined value.

Abstract: Provide is a power supply redundant system in which power supply systems of different voltages coexist, which allows electric power to be supplied to a load even if a ground fault or short circuit occurs therein. The system includes a DCDC converter, a first side of the DCDC convertor being connected to a first battery having a first voltage, a first switch provided between a second battery having a second voltage different from the first voltage and a second side of the DCDC converter, a load operating with the second voltage, separately connected to the second battery and the second side of the DCDC converter, and a controller monitoring a voltage of the second battery by turning on the first switch, and when the voltage of the second battery becomes equal to or lower than a first reference value, switching off the first switch and allowing the DCDC converter to output the second voltage from the second side.

Abstract: A power supply system includes; a first switch connected between a main power source and loads; a second switch connected between a sub-battery and the loads; and backflow prevention circuit that prevent current backflow between the main power source and the sub-battery, and polarity of the backflow prevention circuit is devised so as to allow current passage in a direction from the sub-power source to the loads even when the second switch is in an off state. When power from the main power source is interrupted, the power source power of the sub-power source is supplied to the loads via the backflow prevention circuit even the second switch remains in the off state, so that the power supply is not interrupted.

Abstract: A DC/DC converter includes: electronic components group including a first capacitor, a high-voltage-side switching element, a low-voltage-side switching element, an inductor, and a second capacitor and constituting a half-bridge circuit; and a substrate including a high-voltage region, a low-voltage region, a connection region, and a pair of ground regions. The first capacitor is mounted across one of the ground regions and the high-voltage region. The high-voltage-side switching element is mounted across the high-voltage region and the connection region. The low-voltage-side switching element is mounted across the connection region and one of the ground regions. The inductor is mounted across the connection region and the low-voltage region. The second capacitor is mounted across the low-voltage region and one of the ground regions.

Abstract: Provide is a power supply redundant system in which power supply systems of different voltages coexist, which allows electric power to be supplied to a load even if a ground fault or short circuit occurs therein. The system includes a DCDC converter, a first side of the DCDC convertor being connected to a first battery having a first voltage, a first switch provided between a second battery having a second voltage different from the first voltage and a second side of the DCDC converter, a load operating with the second voltage, separately connected to the second battery and the second side of the DCDC converter, and a controller monitoring a voltage of the second battery by turning on the first switch, and when the voltage of the second battery becomes equal to or lower than a first reference value, switching off the first switch and allowing the DCDC converter to output the second voltage from the second side.

Abstract: Provided is a DC-DC converter including a substrate to which a heat sink is attached, a first terminal and a second terminal connected to different DC power source systems, respectively, a circuit part formed on the substrate and performing DC-DC voltage conversion, a first bus bar as a current path between the first terminal and the circuit part, and a second bus bar as a current path between the second terminal and the circuit part.

Abstract: Provided is a voltage converting unit including: a voltage converter capable of bidirectionally supplying electrical power between a first power system and a second power system; and a bypass switch disposed in parallel to the voltage converter. The voltage converter includes: a detector detecting a difference in voltage between the first power system and the second power system; and a switch controller controlling switching of the bypass switch on the basis of the difference in voltage in accordance with a predetermined rule.

Abstract: A load control backup signal generating circuit for supplying a backup control signal to a switch of a load connected to an output of a control processor in a case that abnormality occurs in the control processor, includes a first input terminal that receives a constant period signal that is output periodically from the control processor when the control processor is normal, a constant period signal monitoring section that monitors a state of the constant period signal for identifying whether a length of the time during which a high or low level state of the constant period signal continues is longer than a predetermined time, and that outputs the signal corresponding to a result of the identification, and a backup signal output section that outputs the backup control signal when the output of the constant period signal monitoring section satisfies a predetermined condition.

Abstract: In a case in which a malfunction occurs in a control processor which operates according to a predetermined program, a load-control backup signal generation circuit supplies a backup control signal to a switch of a load connected to an output of the control processor. The load-control backup signal generation circuit includes: a watchdog input terminal to which a watchdog signal periodically output from the control processor is input; a pulse count unit which counts a clock pulse generated with a constant period and which controls a count state of the clock pulse according to a signal input to the watchdog input terminal; and a signal selection unit which selects, from a plurality of options, a predetermined condition for causing a backup signal output unit to generate the backup control signal, based on a count output signal of a plurality of bits output from the pulse count unit.

Abstract: In a case in which a malfunction occurs in a control processor which operates according to a predetermined program, a load-control backup signal generation circuit supplies a backup control signal to a switch of a load connected to an output of the control processor. The load-control backup signal generation circuit includes: a watchdog input terminal to which a watchdog signal periodically output from the control processor is input; a pulse count unit which counts a clock pulse generated with a constant period and which controls a count state of the clock pulse according to a signal input to the watchdog input terminal; and a backup signal output unit which generates the backup control signal when a count output of the pulse count unit satisfies a predetermined condition.

Abstract: A constant period signal monitoring circuit for monitoring a constant period signal that is output periodically when a control processor operating according to a program is normal, includes a signal input terminal that receives the constant period signal, an edge detection section that detects a change of the constant period signal appearing at the signal input terminal from a low level to a high level or from a high level to a low level as an edge of the constant period signal, and a time measuring section that measures a length of the time during which a state of not detecting the edge continues on the basis of an output of the edge detection section and outputs an abnormality detection signal in a case that the measured time exceeds a threshold value.

Abstract: A constant period signal monitoring circuit for monitoring a constant period signal that is output periodically when a control processor operating according to a program is normal, includes a signal input terminal that receives the constant period signal, an edge detection section that detects a change of the constant period signal appearing at the signal input terminal from a low level to a high level or from a high level to a low level as an edge of the constant period signal, and a time measuring section that measures a length of the time during which a state of not detecting the edge continues on the basis of an output of the edge detection section and outputs an abnormality detection signal in a case that the measured time exceeds a threshold value.

Abstract: A load control backup signal generating circuit for supplying a backup control signal to a switch of a load connected to an output of a control processor in a case that abnormality occurs in the control processor, includes a first input terminal that receives a constant period signal that is output periodically from the control processor when the control processor is normal, a constant period signal monitoring section that monitors a state of the constant period signal for identifying whether a length of the time during which a high or low level state of the constant period signal continues is longer than a predetermined time, and that outputs the signal corresponding to a result of the identification, and a backup signal output section that outputs the backup control signal when the output of the constant period signal monitoring section satisfies a predetermined condition.

Abstract: In a case in which a malfunction occurs in a control processor which operates according to a predetermined program, a load-control backup signal generation circuit supplies a backup control signal to a switch of a load connected to an output of the control processor. The load-control backup signal generation circuit includes: a watchdog input terminal to which a watchdog signal periodically output from the control processor is input; a pulse count unit which counts a clock pulse generated with a constant period and which controls a count state of the clock pulse according to a signal input to the watchdog input terminal; and a signal selection unit which selects, from a plurality of options, a predetermined condition for causing a backup signal output unit to generate the backup control signal, based on a count output signal of a plurality of bits output from the pulse count unit.

Abstract: In a case in which a malfunction occurs in a control processor which operates according to a predetermined program, a load-control backup signal generation circuit supplies a backup control signal to a switch of a load connected to an output of the control processor. The load-control backup signal generation circuit includes: a watchdog input terminal to which a watchdog signal periodically output from the control processor is input; a pulse count unit which counts a clock pulse generated with a constant period and which controls a count state of the clock pulse according to a signal input to the watchdog input terminal; and a backup signal output unit which generates the backup control signal when a count output of the pulse count unit satisfies a predetermined condition.