Abstract: A power supply system includes a main relay provided on a high-voltage path between a high-voltage battery and electrical equipment, a charging relay provided on a charging path connected between the main relay and the electrical equipment, and a control device that controls opening and closing of the main relay and the charging relay. The control device, the main relay, and the charging relay operate using electrical power supplied from a low-voltage battery. In a state in which the main relay and the charging relay are closed, the high-voltage battery is charged by charging it with power supplied from a charging device. In addition, the power supply system includes a relay interruption unit that interrupts the charging relay before interrupting the main relay if a voltage reduction abnormality of the low-voltage battery has occurred under a state in which both the main relay and the charging relay are closed.

Abstract: A vehicular power supply system includes a sensor unit that detects a battery state of a storage battery and a control unit that performs instruction to perform energization and interruption thereof between the storage battery and the electrical load based on the battery state. The sensor unit includes a detection unit that detects the battery state of the storage battery, a switch drive unit that performs drive control of a switch unit provided between the storage battery and the electrical load, and a control unit that controls the switch drive unit. The control unit switches between the energization and interruption thereof between the storage battery and the electrical load. If determining an abnormality, the control unit determines whether to maintain the energization between the storage battery and the electrical load based on the battery state and switches between the energization and interruption thereof based on the determination.

Abstract: A switching power supply device includes: a converter; an input voltage detecting unit configured to detect an input voltage of the converter; a current detecting unit configured to detect at least one of an input current and an output current of the converter; a dead time setting unit configured to set a dead time in on/off operations of switching elements of the converter; and a dead time table in which the dead time is recorded for each input voltage value and each output current value on a matrix formed by input voltage values and output current values. The dead time setting unit sets the dead time with reference to the dead time table based on the input voltage detected by the input voltage detecting unit and the current detected by the current detecting unit.