Patent ID: 9702914
Date: 2017-07-11
CPC Classifications: G01R,G06F,H03K

Claim:
1. A capacitance measurement device for measuring the capacitance of a measured capacitor, comprising: a charging control unit for charging the measured capacitor; a discharging control unit for discharging the measured capacitor; a voltage converting circuit coupled to the measured capacitor, for converting a voltage signal on the measured capacitor into a value that represents the capacitance of the measured capacitor; a first switch coupled between the measured capacitor and the charging control unit, for controlling a connection between the measured capacitor and the charging control unit according to a first switching signal; and a second switch coupled to the measured capacitor and the discharging control unit, for controlling a connection between the measured capacitor and the discharging control unit according to a second switching signal; wherein in a first period, one of the charging control unit and the discharge control unit charges/discharges the measured capacitor and in a second period after the first period, the other one of the charging control unit and the discharge control unit discharges/charges the measured capacitor; wherein at least one of the discharging control unit and the charging control unit further sets a discharging/charging capacity for discharging/charging the measured capacitor according to the voltage signal on the measured capacitor.