Patent ID: 8624438
Filing Date: 2014-01-07
Classification: H02J

Abstract:
1. A control device comprising a power supply unit and a control unit externally connected to the power supply unit, the power supply unit including: a sub power supply; a sub power supply line that connects the sub power supply to a load; a first semiconductor switch serially connected to the sub power supply line by connecting a source thereof to the sub power supply; a second semiconductor switch serially connected to the sub power supply line by connecting a drain thereof to a drain of the first semiconductor switch; and a sub control unit that controls on/off of the first semiconductor switch and the second semiconductor switch, and monitors a drain voltage between the first semiconductor switch and the second semiconductor switch and a source voltage of the second semiconductor switch, to thereby perform fault diagnosis, and the control unit including: a sub power supply line connected to the sub power supply line of the power supply unit to connect the sub power supply to the load; a third semiconductor switch serially connected to the sub power supply line by connecting a source thereof to the sub power supply; a fourth semiconductor switch serially connected to the sub power supply line by connecting a drain thereof to a drain of the third semiconductor switch; a main power supply line that connects a main power supply separate from the sub power supply to the load and is provided in parallel with the sub power supply line; a relay provided in the main power supply line; and a main control unit that controls on/off of the relay, the third semiconductor switch, and the fourth semiconductor switch, and monitors a drain voltage between the third semiconductor switch and the fourth semiconductor switch and a source voltage of the third semiconductor switch, to thereby perform fault diagnosis.