Circuit and method for adapting forward/reverse current of electrochemical gas sensor
A gas sensor and adaptive circuit technology, applied in the direction of material electrochemical variables, etc., can solve problems such as low work efficiency, increased circuit design costs, increased costs, etc., to achieve the effect of saving costs, simplifying product design and production
Active Publication Date: 2012-10-03
CHENGDU ACTION ELECTRONICS JOINT STOCK
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Problems solved by technology
Generally speaking, the output current signal of the electrochemical gas sensor needs to be collected and amplified by a signal extraction circuit, and then sent to a control processing unit such as a single-chip microcomputer through the AD sampling circuit for further analysis and processing. If the output of the electrochemical gas sensor is negative, It is also necessary to add a circuit for converting the negative signal into a positive signal after the signal extraction circuit, such as an inverting follower, which not only increases the complexity of the working circuit for adapting the negative current sensor, but also increases the complexity of the circuit. The design cost, and in actual use, it is necessary to design different sensor working circuits to adapt to electrochemical gas sensors with different output current directions
For the user, it is necessary to purchase at least two sets of sensor working circuits, and select different sensor working circuits according to the characteristics of the sensor, which not only increases the cost, but also reduces the work efficiency.
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[0029] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0030] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0031] Such as figure 1 , The forward and reverse current adaptation circuit of the electrochemical gas sensor disclosed in the present invention includes a sensor power supply circuit, a power supply configuration circuit and a sensor output signal extraction circuit. The sensor power supply circuit is used to supply power to the electrochemical gas sensor, the sensor output signal extraction circuit is used to receive and amplify the signal...
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The invention discloses a circuit and a method for adapting a forward / reverse current of an electrochemical gas sensor, relates to a gas detecting technology and aims to provide an operating circuit and method for adapting a forward or reverse current outputted by the electrochemical gas sensor. The circuit is characterized by comprising a sensor power supply circuit, a power supply configuring circuit and a sensor output signal extracting circuit, wherein the sensor power supply circuit is used for supplying power to the electrochemical gas sensor; the sensor output signal extracting circuit is used for receiving and amplifying a signal outputted by the electrochemical gas sensor; and the power supply configuring circuit is used for outputting a voltage signal more than or equal to 0 to the sensor output signal extracting circuit, so as to cause an output voltage signal of the sensor output signal extracting circuit to be more than or equal to 0.
Description
technical field [0001] The invention relates to gas detection technology, in particular to an adaptation circuit and method for an electrochemical gas sensor to output forward and reverse currents. Background technique [0002] In the gas detection industry, the detection of toxic gases is a very important part of the industry. Toxic gas detection is mainly realized by electrochemical gas sensors. Electrochemical gas sensors have the advantages of fast response speed, accuracy (applicable to ppm level), good stability, quantitative detection, good repeatability, and strong anti-interference ability. [0003] Electrochemical gas sensors work by reacting with the gas being measured and producing an electrical signal proportional to the gas concentration. A typical electrochemical gas sensor consists of a working electrode (or sensing electrode) and a counter electrode separated by a thin electrolytic layer. When the target gas enters the sensor, it undergoes oxidation-reduct...
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IPC IPC(8): G01N27/26
Inventor 何柳
Owner CHENGDU ACTION ELECTRONICS JOINT STOCK