公开(公告)号：WO2014101869A1

公开(公告)日：2014-07-03

申请号：PCT/CN2013/090888

申请日：2013-12-30

Applicant: SHENZHEN BYD AUTO R&D COMPANY LIMITED ,  BYD COMPANY LIMITED

Inventor： CHEN, Shengsheng ,  ZHANG, Jie ,  YANG, Yun

IPC: G06F3/044

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

Abstract: A capacitance detecting circuit is provided, comprising: N induction units; a transferring capacitor configured to transfer charges to a capacitor of a scanned induction unit, and a second terminal of the transferring capacitor is grounded; a charging module (101) configured to charge the transferring capacitor, and a second terminal of the charging module (101) is connected with a first power supply; a discharging module (100) configured to discharge the transferring capacitor and comprising a first resistor and a second switch, a second terminal of the discharging module (100) is grounded; a controller connected with the charging module (101), the transferring capacitor and the discharging module respectively, and configured to control the second switch to switch on when a voltage of the transferring capacitor is larger than a preset threshold voltage, to update a count value and to detect a touch on the N induction units according to the count value.

Abstract translation: 提供一种电容检测电路，包括：N个感应单元; 转移电容器，被配置为将电荷转移到扫描的感应单元的电容器，并且所述转移电容器的第二端子接地; 充电模块（101），被配置为对所述传送电容器进行充电，并且所述充电模块（101）的第二端子与第一电源连接; 放电模块（100），被配置为对所述转移电容器进行放电并且包括第一电阻器和第二开关，所述放电模块（100）的第二端子接地; 与充电模块（101）连接的控制器，转移电容器和放电模块，并且被配置为当转印电容器的电压大于预设阈值电压时控制第二开关导通，以更新计数值 并根据计数值检测N感应单元上的触摸。