Air conditioner current protecting method and air conditioner

Abstract

The invention discloses an air conditioner current protecting method. The method specifically comprises the steps of determining whether the air conditioner is in a refrigerating mode / a heating modeafter the air conditioner is started to run; detecting the environmental temperature, the input voltage and the working current; determining whether the working current reaches the current protectingvalue which is matched with the environmental temperature range and the input voltage range based on the environmental temperature range and the input voltage range which are corresponding to the environmental temperature and the input voltage; and controlling a compressing mechanism to perform at least one of the following operations to realize current protecting: maintaining the frequency / decreasing the frequency by one preset value F / controlling the compressor to stop, and restarting after passing the preset stop time. According to the method, the environmental temperature and the input voltage are treated as the determining conditions, and the sectional protection is reasonable and fine; the current control stability is improved; the operation risk is reduced; the use comfort is improved; and the performances of the air conditioner can be effectively played.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to an air conditioner current protection method and an air conditioner. Background technique [0002] At present, the current protection control of ordinary inverter air conditioners is mainly based on the reliability requirements of the air conditioner and the heat load of the air conditioner to carry out segmental control and protection parameters. This protection method itself has no problem, but the problem is that segmental control is too rough. Temperature segmental control, below a certain temperature is a protection parameter, above this temperature is another protection parameter, the discontinuity of this control method will greatly affect the performance of the air conditioner, so that the compressor can continue to maintain high In the case of high-frequency operation, the current advance protection limits the frequency rise and the performance of th...

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Problems solved by technology

[0002] At present, the current protection control of ordinary inverter air conditioners is mainly based on the reliability requirements of the air conditioner and the heat load of the air conditioner to carry out segmental control and protection parameters. This protection method itself has no problem, but the problem is that segmental control is too rough. Temperature segmental control, below a certain temperature is a protection parameter, above this temperature is another protection parameter, the discontinuity of this control method will greatly affect the performance of the air conditioner, so that the compressor can continue to maintain high In the case of high-frequency operation, the current advance protection limits the frequency rise and the performance of the capability because it just crosses the subsection interval, and this discontinuous simple and rough subsection protection control is easy to be caused by the temperature in the subsection critical area. Temperature fluctuations lead to increased fluctuations in current protection, resulting in unstable operation of the system and a very unreliable risk to the whole machine

[0003] In the prior art, the current protection mechanism of the inverter air conditioner is as follows: figure 1 As shown, the main control MCU of the original inverter air conditioner only judges according to a single parameter of current detection, and controls the frequency change of the compressor when the corresponding current protection value is reached.

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