发明授权
US6160404A Circuit for measuring the electrode current of a ceramic gas sensor
失效
用于测量陶瓷气体传感器的电极电流的电路
- 专利标题: Circuit for measuring the electrode current of a ceramic gas sensor
- 专利标题(中): 用于测量陶瓷气体传感器的电极电流的电路
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申请号: US88053申请日: 1998-06-01
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公开(公告)号: US6160404A公开(公告)日: 2000-12-12
- 发明人: Rene Schenk
- 申请人: Rene Schenk
- 申请人地址: DEX Stuttgart
- 专利权人: Robert Bosch GmbH
- 当前专利权人: Robert Bosch GmbH
- 当前专利权人地址: DEX Stuttgart
- 优先权: DEX19722872 19970531
- 主分类号: F02D41/14
- IPC分类号: F02D41/14 ; G01N27/406 ; G01N27/419 ; G01R1/20 ; G01N27/62 ; G01N27/00
摘要:
The invention relates to a circuit for measuring the electrode current of a ceramic gas sensor for measuring a gas. The ceramic gas sensor has first and second sensor electrodes arranged in a heatable ceramic and the first sensor electrode functions as a measuring electrode and the second sensor electrode functions as a reference electrode. The circuit is a current measuring circuit connected to the first and second sensor electrodes and the current measuring circuit includes: a current measuring shunt (R2) for conducting a measurement current flowing away from the first sensor electrode thereby causing a first voltage drop across the current measuring shunt (R2); a first circuit part for detecting the measurement current; a current feedback shunt (R1) connected to the second sensor electrode; a second circuit part for generating a current having a magnitude corresponding to the magnitude of the measurement current detected by the first circuit part; the second circuit part being connected to the current feedback shunt (R1) whereby the current generated by the second circuit part flows to the second sensor electrode via the current feedback shunt (R1) causing a second voltage drop across the current feedback shunt (R1); and, a third circuit part for amplifying the difference of the first and second voltage drops and converting the difference into a measurement signal referred to a reference potential.
公开/授权文献
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