Phase sequence detection circuit, method and electronic device for three-phase motor

Abstract

The application relates to the technical field of motor protection, in particular to a phase sequence detection circuit of a three-phase motor and an electronic device. The circuit comprises a first detection module, a second detection module and a third detection module, which respectively acquire three sampling signals between adjacent two live lines, and the three sampling signals are transmitted in parallel after isolation, and are converted into a first voltage signal, a second voltage signal and a third voltage signal under the premise of not changing the waveforms of the signals, so as to be transmitted to a processor, so that the processor detects the phase sequence condition of the three-phase motor according to the received three voltage signals. The scheme is simple to implement, the characteristics of three-phase alternating current are utilized, the waveforms of the signals are not changed, the corresponding three voltage signals are transmitted to the processor in real time, so that the processor identifies the corresponding phase sequence condition according to the real-time conditions of the three signals, the scheme principle is clear, the structure is simple, the scheme is easy to implement and convenient to popularize.

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