Compressor frequency control method and device and air conditioner

Abstract

The invention provides a compressor frequency control method and device and an air conditioner and relates to the technical field of air conditioners. According to the method and the device, a high pressure value and a temperature value of an intelligent power module are obtained, and the frequency of a compressor is controlled according to the high pressure value and the temperature value of theintelligent power module; due to a comprehensive high pressure value and a comprehensive temperature value of the intelligent power module, protection threshold values of the high pressure value and temperature value of the intelligent power module are matched as much as possible, so that when the frequency of the compressor is controlled, frequency limiting operation or frequency reduction operation can be conducted on the compressor if any one of the high pressure value or the temperature value of the intelligent power module reaches the protection threshold value, the high pressure value and the temperature value of the intelligent power module are approximate to critical values, and therefore the cooling capacity of the air conditioner at high temperature is increased.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a compressor frequency control method and device and an air conditioner. Background technique [0002] Air conditioner is a widely used air conditioning equipment, the main function is to adjust the temperature and humidity of the air. Compared with ordinary fixed frequency air conditioners, inverter air conditioners have the advantages of energy saving and comfort. [0003] Generally, the national standard for high-temperature cooling capacity of air-conditioning systems requires that the ratio of high-temperature cooling capacity / rated cooling capacity be greater than or equal to 85%, but in actual tests, the margin of this ratio is small, that is, the high-temperature cooling capacity is small, which affects the high-temperature cooling capacity. The main factors of the cooling capacity are: on the one hand, when the air conditioner is in the cooling working condition...

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Problems solved by technology

[0003] Generally, the national standard for high-temperature cooling capacity of air-conditioning systems requires that the ratio of high-temperature cooling capacity / rated cooling capacity be greater than or equal to 85%, but in actual tests, the margin of this ratio is small, that is, the high-temperature cooling capacity is small, which affects the high-temperature cooling capacity. The main factors of the cooling capacity are: on the one hand, when the air conditioner is in the cooling working condition, as the outdoor temperature rises, the compressor rotates faster and the current increases, which causes the temperature of the Intelligent Power Module (IPM module) to rise. High, and once the temperature of the intelligent power module is greater than or equal to the frequency limit temperature of the compressor module, the frequency of the compressor is prohibited from increasing. However, the high-temperature cooling capacity is not fully utilized at this time; When the load increases, the evaporating temperature and condensing temperature will increase correspondingly in this state. Once the pressure of the air conditioning system reaches the protection value, the compressor will be limited and lowered. This condition also restricts the capacity of high-temperature cooling capacity

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