| 摘要 |
PROBLEM TO BE SOLVED: To break current flowing in a voltage detection circuit from a DC power supply when the detection of voltage is not required in the voltage detection circuit with respect to the DC power supply having a relatively high voltage (for example, 288V) mounted to a hybrid electric vehicle, or the like. SOLUTION: The voltage detection circuit comprises a voltage dividing circuit consisting of resistors R1, R2, connects the resistor R2 to the negative pole of the DC power supply 10, and allows voltage at both the ends of the resistor R2 to be voltage detection output; a transistor M1 inserted between the positive electrode of the DC power supply 10 and the resistor R1; and a level shift circuit for shifting the level of a control signal to be inputted for supplying to the gate of the transistor M1. The level shift circuit comprises a resistor R3 for connecting the source of the transistor M1 to the gate; a resistor R4 whose one end is connected to the gate of the transistor M1; and a transistor Q1, where the collector is connected to the resistor R4, the emitter is connected to the negative electrode of the DC power supply 10, and on/off is controlled by the control signal with the control signal as an input to a base. COPYRIGHT: (C)2005,JPO&NCIPI
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