Method and device for detecting current effective value of outdoor unit of variable-frequency air conditioner
A technology of current effective value and variable frequency air conditioner, which is applied in the field of electronics and can solve the problems such as the inability of smooth transition calculation and the error of current effective value calculation value, etc.
Active Publication Date: 2020-09-11
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 purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection of the present invention. scope.
[0060] In the prior art, in order to obtain the current effective value of the outdoor unit of the inverter air conditioner, the instantaneous value of the AC current sampled by power factor correction (PFC) is usually used to calculate the current effective value. However, if you want to calculate the accurate current RMS value, the premise of this met...
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The invention provides a method and a device for detecting a current effective value of an outdoor unit of a variable frequency air conditioner. The method comprises the following steps: determining afunction mapping relationship among a current peak value, a current average value and a current effective value of alternating current; sampling at least two current alternating current instantaneousvalues in at least one current period length by using PFC control for the to-be-tested variable frequency air conditioner outdoor unit; according to the sampled current alternating current instantaneous value, obtaining a current current average value corresponding to the to-be-tested variable frequency air conditioner outdoor unit; obtaining a current current peak value corresponding to the to-be-tested variable frequency air conditioner outdoor unit according to the sampled current alternating current instantaneous value; and calculating a current effective value corresponding to the variable frequency air conditioner outdoor unit to be tested according to the current average value, the current peak value and the function mapping relationship. According to the scheme, the calculation accuracy of the current effective value can be improved.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a method and a device for detecting the effective value of current of an outdoor unit of an inverter air conditioner. Background technique [0002] Inverter air conditioners usually use AC-DC-AC inverter technology to control the compressor of the inverter air conditioner. In order to protect the operation of the compressor, the effective value of the current of the outdoor unit of the inverter air conditioner is detected, so that the compressor is controlled and protected according to the detected effective value of the current. [0003] At present, in order to obtain the effective value of the current of the outdoor unit of the inverter air conditioner, the instantaneous value of the AC current sampled by power factor correction (PFC) is usually used to calculate the effective value of the current. However, it is often impossible to obtain an accurate current RMS value by ...
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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