Patent ID: 9671469
Date: 2017-06-06
CPC Classifications: G01R

Claim:
1. A voltage detection circuit for a secondary battery, the voltage detection circuit comprising: a main capacitor connected to both terminals of the secondary battery via an input side sampling switch, the main capacitor being charged by the secondary battery; and a differential amplifier circuit connected to the main capacitor via an output side sampling switch, wherein an output terminal of the differential amplifier circuit is connected to an inverting input terminal of the differential amplifier circuit via a sub-capacitor, and wherein the output terminal of the differential amplifier circuit is connected to the inverting input terminal of the differential amplifier circuit via a resistor and a switch in series; and the resistor and the switch are further connected in parallel with the feedback capacitor to provide a structure in which, by turning the switch ON and OFF, the integrator circuit is selectively operated.