Weak current detecting circuit of nitrogen-oxygen sensor
A nitrogen and oxygen sensor, weak current technology, applied in the direction of measuring current/voltage, only measuring current, instruments, etc., can solve the problem of complex detection of weak current detection circuit, to enhance anti-interference ability, reduce conversion error, reduce noise the effect of
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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0024] The weak current detection circuit provided by the present invention includes: a current-voltage conversion circuit, a differential low-pass filter and an amplifying circuit; first, a high-precision, low-temperature drift sampling resistor is connected to the signal loop to form a current-voltage conversion circuit. The original current signal is converted into a voltage signal, and its multiple is the value of the connected sampling resistor; then, the converted voltage signal flows into the differential low-pass filter circuit to filter out the radio frequency noise mixed in the weak voltag...
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