Alternating current acquisition circuit, monitoring device and electric equipment

Abstract

The invention relates to an alternating current acquisition circuit. The alternating current acquisition circuit comprises a square wave generation circuit, a logic circuit and a comparison circuit; the first end of the square wave generation circuit is connected with alternating current, the second end of the square wave generation circuit is connected with the first end of the logic circuit, thesecond end of the logic circuit is connected with the first end of the comparison circuit, and the second end of the comparison circuit is connected with alternating current; the third end of the comparison circuit is connected with the third end of the logic circuit, the second end of the logic circuit is connected with the signal output end, and the comparison circuit can adjust the duty ratioof signals output by the signal output end, so that the alternating current acquisition circuit can transmit voltage signals through the duty ratio and transmit frequency signals through a frequency period. The frequency of an output signal of the signal output end is matched with the frequency of an access signal of the square wave generation circuit, so that the signal output by the output end can achieve voltage and frequency acquisition of the access signal at the same time, multiple signal states can be transmitted at the same time through a single port, and the utilization rate of the output port is improved.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to an alternating current collection circuit, a monitoring device and electrical equipment. Background technique [0002] With the development of science and technology, various power control devices emerge in an endless stream. For example, the frequency converter is a power control device that changes the frequency of the motor's working power supply to control the AC motor. It relies on the switching of the transistor to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor. And then achieve the purpose of energy saving and speed regulation. The frequency converter needs to sample the alternating current as the basis for over-voltage and under-voltage protection, over-under-frequency protection. [0003] Traditional inverters have multiple modules such as rectifi...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of low functional density of traditional sampling ports, the present invention proposes an alternating current acquisition circuit, monitoring device and electrical equipment, which can achieve the technical effect of improving port utilization

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