公开(公告)号：US20170160323A1

公开(公告)日：2017-06-08

申请号：US15436981

申请日：2017-02-20

Applicant: BYD COMPANY LIMITED

Inventor： Shengsheng CHEN ,  Jie ZHANG ,  Yun YANG

IPC: G06F3/045

CPC classification number: G06F3/0418 ,  G06F3/0416 ,  G06F3/044 ,  G06F3/047 ,  G09G5/003 ,  G09G2300/0426

Abstract: A capacitance detecting circuit includes induction units; a transferring capacitor configured to transfer charges to a capacitor of a scanned induction unit; a charging module that charges the transferring capacitor, wherein a first terminal of the charging module connects to the first terminal of the transferring capacitor, and a second terminal of the charging module connects to a first power supply; a discharging module that discharges the transferring capacitor and including a first resistor and a second switch; and a controller connected to the charging module, the transferring capacitor and the discharging module, and configured to control the second switch to switch on when a voltage of the transferring capacitor is larger than a preset threshold voltage, and to update a count value and detect a touch on the induction units according to the count value.