![测量电容值的方法](/CN/2016/8/7/images/201680036320.jpg)
基本信息:
- 专利标题: 测量电容值的方法
- 专利标题(英):METHOD FOR MEASURING A CAPACITANCE VALUE
- 申请号:CN201680036320.X 申请日:2016-06-29
- 公开(公告)号:CN107810603A 公开(公告)日:2018-03-16
- 发明人: 卡尔 , 克里斯蒂安·莱科索
- 申请人: 利奥波德·科世达责任有限股份公司
- 申请人地址: 德国吕登沙伊德
- 专利权人: 利奥波德·科世达责任有限股份公司
- 当前专利权人: 利奥波德·科世达责任有限股份公司
- 当前专利权人地址: 德国吕登沙伊德
- 代理机构: 北京博华智恒知识产权代理事务所
- 代理人: 蔡民军; 李江
- 优先权: 102015008485.2 20150701 DE
- 国际申请: PCT/EP2016/065190 2016.06.29
- 国际公布: WO2017/001510 DE 2017.01.05
- 进入国家日期: 2017-12-20
- 主分类号: H03K17/955
- IPC分类号: H03K17/955 ; H03K17/96
The invention relates to a method for measuring a capacitance value CM of a capacitive sensor element by means of an integration method, wherein a terminal of the sensor element is electrically connected to a first terminal of an integration capacitor having a known capacitance value CI, which is high by comparison with the capacitance value CM of the sensor element, at a common circuit node, andwherein after a number IZ of integration cycles have been carried out, a voltage UCI at the integration capacitor is measured by means of an A/D converter. The method according to the invention comprises the method steps of: a) defining a number N of integration cycles to be carried out at a start value NStart and determining an end value NEnd for the number N of integration cycles to be carried out b) initializing a voltage sum value UGes to the value of zero c) initializing the number IZ of executed integration cycles to the value of zero d) connecting the common circuit node (3) and a second terminal (2'') of the integration capacitor (2) to an earth potential GND e) carrying out the integration method until the number IZ of executed integration cycles has reached the number N of integration cycles to be carried out f) adding the voltage value UCI(N) currently determined by means of the A/D converter, to the voltage sum value UGes g) increasing the number N by a value n, wherein n is greater than or equal to 1 and is less than NDiff = NEnd - NStart , h) repeating the method steps from step e) until the number N exceeds the determined end value NEnd i) evaluating the voltage sumvalue UGes as the measurement result.
公开/授权文献:
- CN107810603B 测量电容值的方法 公开/授权日:2021-06-18
IPC结构图谱:
H | 电学 |
--H03 | 基本电子电路 |
----H03K | 脉冲技术 |
------H03K17/00 | 电子开关或选通,即不通过通断接触的 |
--------H03K17/51 | .按使用特殊元件区分的 |
----------H03K17/945 | ..接近开关 |
------------H03K17/955 | ...应用容性检测器的 |