A kind of overcurrent and overvoltage protection circuit for 4-20ma current input circuit
A technology of input circuit and protection circuit, which is applied in the direction of protection reacting to overcurrent and protection reacting to overvoltage, etc. It can solve the problems of limited function of overvoltage and overcurrent protection, poor input signal acquisition accuracy, burning Bad Q1 and other problems, to achieve the effect of low implementation cost, low input impedance, and fast response
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] image 3 It is a schematic block diagram of the input overcurrent and overvoltage protection circuit of the present invention.
[0023] See image 3 , the overcurrent and overvoltage protection circuit for the 4-20mA current input circuit provided by the present invention comprises:
[0024] Filtering and rectifying module 1: filter out the instantaneous overvoltage pulse interference signal in the input signal, and prevent the signal from being reversed;
[0025] Switch control module 2: receive the current signal output by the filter rectifier module 1 and control the on-off of the current loop;
[0026] Voltage acquisition module 4: convert the current signal from the switch control module 2 into a corresponding voltage signal; and
[0027] The signal monitoring module 3: monitors the voltage signal collected by the voltage collecting modu...
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