Patent ID: 7161355

Claim:
A voltage detection device, comprising: a processor that has a first input port for connecting to a voltage detection object part, and a second input port grounded at a first ground potential part; a first Schottky barrier diode that has a cathode connected to a junction of an electric wire between the first input port and the voltage detection object part, and an anode grounded at a second ground potential part; and a second Schottky barrier diode that has an anode connected to a junction of an electric wire between the second input port and a third ground potential part, and a cathode connected to a positive terminal of a power supply, the second Schottky barrier diode being identical to the first Schottky barrier diode in the leakage current standard, wherein when the processor detects a voltage at the voltage detection object part, the processor detects a value obtained by adding a voltage applied to the second input port to a voltage applied to the first input port as the voltage.