Novel AC voltage detection circuit

Abstract

The invention relates to the field of a detection circuit, and especially relates to a novel AC voltage detection circuit, which comprises a current-limiting portion circuit, an AC / DC conversion portion circuit, a reference voltage generation circuit, a voltage comparison portion circuit and a signal detection portion circuit, where the current-limiting portion circuit, the AC / DC conversion portion circuit, the reference voltage generation circuit, the voltage comparison portion circuit and the signal detection portion circuit are connected in series. The novel AC voltage detection circuit is simple to use and low in cost; and the detection circuit can realize judgment of the input of the AC voltage and detection of the AC voltage.

Description

technical field [0001] The invention relates to the field of detection circuits, in particular to a novel AC voltage detection circuit. Background technique [0002] In industrial production, the detection of input power is increasingly important, which mainly involves two aspects, one is whether there is AC power input, and the other is whether the voltage value of AC input meets the demand; for the detection of whether there is AC input, the most common The method is to use an AC optocoupler to judge by detecting the output level of the AC optocoupler, but this method can only judge whether the AC power is input, and cannot detect the voltage value of the input AC power. For AC voltage The detection of the voltage value generally adopts the method of voltage transformer. By using the current type voltage transformer, the voltage measured by AC is converted into DC voltage for detection so as to obtain the input AC voltage. However, this method requires the use of both volt...

AI Technical Summary

Problems solved by technology

[0002] In industrial production, the detection of input power is becoming more and more important, which mainly involves two aspects, one is whether there is AC power input, and the other is whether the voltage value of AC input meets the demand; for the detection of whether there is AC input, the most common The method is to use an AC optocoupler to judge by detecting the output level of the AC optocoupler, but this method can only judge whether the AC power is input, and cannot detect the voltage value of the input AC power. For AC voltage The detection of the voltage value generally adopts the method of voltage transformer. By using the current-type voltage transformer, the voltage measured by AC is converted into DC voltage for detection to obtain the input AC voltage. However, this method requires the use of both voltage transformer and AD chip can only be realized, the cost is high and the circuit is complicated

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