Judgement and protection method for open phase of frequency-conversion air conditioner compressor
A technology for frequency conversion air conditioners and compressors, which is applied to emergency protection circuit devices, multi-phase network asymmetry measurement, electrical components, etc., can solve problems affecting the rapid popularization of frequency conversion air conditioners and increase the cost of air conditioners, and achieve simple and efficient judgment methods. The effect of low requirements, low computing speed and low computing power
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[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0020] like figure 1 , figure 2 , image 3 , Figure 4 Shown, a kind of frequency conversion air conditioner compressor phase loss judgment and protection method of the present invention, it comprises the following steps:
[0021] (1) Measure the quiescent current value of the frequency converter in advance; set the current threshold value of the lack of phase of the compressor according to the quiescent current value; in this step, the quiescent current value is the no-load current of the circuit, and different circuit layouts may It will be different due to the mutual interference of each device. Therefore, in the actual process, the quiescent current value must be obtained through testing. Technicians can independently measure the quiescent current value of a device. In this embodiment, the current threshold is generally set according ...
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