Method and device for detecting the effective value of current of an outdoor unit of an inverter air conditioner
A current effective value, frequency conversion air conditioner technology, applied in the electronic field, can solve the problems of current effective value calculation value error, smooth transition calculation and other problems, and achieve the effect of accurate current effective value
Active Publication Date: 2022-08-09
SICHUAN HONGMEI INTELLIGENT TECH CO LTD
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Problems solved by technology
This method cannot perform smooth transition calculation under different waveform conditions, and there must be a large error in the calculation value of the effective value of the current near the state of segment switching
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[0059] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are protected by the present invention. scope.
[0060] In the prior art, in order to obtain the RMS current of the outdoor unit of the inverter air conditioner, the RMS value of the current is usually calculated by using the instantaneous value of the AC current sampled by the power factor correction (PFC) control. However, if you want to calculate the accurate current RMS, the premise of thi...
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The present invention provides a method and device for detecting the effective value of current of an outdoor unit of a frequency conversion air conditioner. The method includes: determining the function mapping relationship between the current peak value, the current average value and the current effective value of the alternating current; for the outdoor unit of the variable frequency air conditioner to be tested, using PFC control to sample at least two current alternating currents within the length of at least one current cycle The instantaneous value; according to the sampled instantaneous value of the current AC current, the current average value of the current corresponding to the outdoor unit of the variable frequency air conditioner to be tested is obtained; according to the sampled instantaneous value of the current AC current, the outdoor unit of the variable frequency air conditioner to be tested is obtained The corresponding current peak value; according to the current average value, the current peak value and the function mapping relationship, the effective value of the current corresponding to the outdoor unit of the variable frequency air conditioner to be tested is calculated. The solution of the present invention can improve the accuracy of the calculation of the effective value of the current.
Description
technical field [0001] The invention relates to the technical field of electronics, and in particular to a method and a device for detecting the effective value of current of an outdoor unit of a variable frequency air conditioner. Background technique [0002] Inverter air conditioners usually use AC-DC-AC inverter technology to control the compressors of inverter air conditioners. In order to protect the operation of the compressor, the rms current value of the outdoor unit of the inverter air conditioner is detected, so as to control and protect the compressor according to the detected rms current value. [0003] At present, in order to obtain the RMS current of the outdoor unit of the inverter air conditioner, the RMS value of the current is usually calculated by using the instantaneous value of the AC current sampled by the power factor correction (PFC) control. However, directly using the instantaneous value of the alternating current to calculate the rms value of the...
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IPC IPC(8): G01R19/02G01R19/00G01R19/30
CPCG01R19/02G01R19/003G01R19/30Y02B70/10
Inventor 朱绯石明杰杨正王声纲
Owner SICHUAN HONGMEI INTELLIGENT TECH CO LTD