| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively and accurately detect a voltage of a battery. SOLUTION: The battery voltage detection circuit includes: an operational amplifier; a first capacitor connected to one input terminal of the operational amplifier at one end; a second capacitor connected to an output terminal of the operational amplifier at one end, and connected to one input terminal of the operational amplifier at the other end; a third capacitor connected to the other input terminal of the operational amplifier at one end; a fourth capacitor supplied with a first reference voltage at one end, and connected to the other input terminal of the operational amplifier at the other end; a switch circuit for supplying the other end of the first capacitor with a voltage at one terminal of the battery, and supplying the other ends of the first and third capacitors with a voltage at the other terminal of the battery after the voltage at the other terminal of the battery is supplied to the other end of the third capacitor; and a discharge circuit for discharging the second and fourth capacitors before the voltage at the other terminal of the battery is supplied to the other ends of the first and third capacitors. COPYRIGHT: (C)2009,JPO&INPIT
|
