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

Active Publication Date: 2010-12-15
安徽奥克斯智能电气有限公司
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Problems solved by technology

The above two methods can basically determine the lack of phase of the compressor and carry out corresponding protection, but because of the need to add additi

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  • Judgement and protection method for open phase of frequency-conversion air conditioner compressor
  • Judgement and protection method for open phase of frequency-conversion air conditioner compressor
  • Judgement and protection method for open phase of frequency-conversion air conditioner compressor

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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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Abstract

The invention discloses a judgement and protection method for an open phase of a frequency-conversion air conditioner compressor, which comprises the following steps of: firstly, measuring a quiescent current value of a frequency converter, and setting a current threshold value of the open phase of the compressor according to the quiescent current value; secondly, reading a current value sampled at random during the operation of the frequency converter, and calculating current values I1, I2 and I3 of three phases of the compressor in a drive circuit mode utilized by the frequency converter according to the current value; and thirdly, comparing the current values I1, I2 and I3 calculated in the second step with the current threshold value; if any one of the I1, I2 and I3 is lower than the current threshold value, the open phase of the compressor is judged, and the output of the frequency converter is stopped to indicate the open phase fault of the compressor; and otherwise, returning to the second step. The method cannot increase the cost of the air conditioner, and can reduce the open phase operation fault of the air conditioner.

Description

technical field [0001] The invention relates to the technical field of frequency conversion air conditioners, in particular to a method for judging and protecting the lack of phase of a compressor of a frequency conversion air conditioner. Background technique [0002] As people's requirements for the reliability and comfort of air conditioners are getting higher and higher, and with the gradual maturity of frequency conversion technology, frequency conversion air conditioners have begun to enter everyone's life. However, compared with ordinary air conditioners, inverter air conditioners have a more complex structure, so their failure rate is higher, especially the proportion of air conditioner failures caused by the continuous operation of inverter compressors after phase loss is still high. Based on the above problems, air conditioners in the prior art are generally equipped with a phase loss detection and protection device for the compressor, or a current transformer can ...

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Application Information

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IPC IPC(8): H02H7/09G01R29/16
Inventor 郑坚江张福成
Owner 安徽奥克斯智能电气有限公司
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