Temperature rise control method for variable-frequency air conditioner power module

Abstract

The invention discloses a temperature rise control method for a variable-frequency air conditioner power module. The method includes the following steps that firstly, outdoor environment temperature is detected in real time and judged, and when the outdoor environment temperature is larger than a second preset threshold T2, the temperature rise control step is executed; secondly, the maximum operation frequency of a compressor is updated to the maximum permissible operation frequency of the compressor. According to the temperature rise control method for the variable-frequency air conditioner power module, firstly, whether an air conditioner is allowed to enter a power module temperature rise control mode is judged according to the outdoor environment temperature, then alternating-current voltage is sampled, the maximum permissible operation frequency of the compressor at current alternating-current voltage is calculated, and the maximum operation frequency of the compressor is limited below the maximum permissible operation frequency so as to prevent the situation that the operation frequency of the compressor is excessively large, and temperature rise of a power module is exacerbated. It is guaranteed that the temperature of the power module is limited in a safety operation range so as to guarantee the service life of the power module and normal operation of the air conditioner.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a method for controlling the temperature rise of a frequency conversion air conditioner power module. Background technique [0002] The outdoor fan of the inverter air conditioner is used to dissipate heat for the condenser and the power module during cooling of the air conditioner. The outdoor fan of the inverter air conditioner can be a DC fan or an AC fan. When an AC fan is used, the speed of the fan is proportional to the AC voltage, that is, the voltage The higher the voltage, the higher the wind speed, and the lower the voltage, the lower the wind speed. After the wind speed of the outdoor fan decreases, it is not conducive to the heat dissipation of the power module of the outdoor unit of the air conditioner, and the temperature of the outdoor power module will rise, reaching or exceeding the module protection temperature point, which will damage the p...

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Problems solved by technology

[0003] The present invention solves the problem that when an inverter air conditioner using an AC fan for the existing outdoor fan works in an environment with unstable voltage, if the voltage is low, the wind speed of the AC fan will drop, which is not conducive to the heat dissipation of the power module of the outdoor unit, resulting in a rapid temperature increase of the power module of the outdoor unit. If the temperature rises, the power module will be damaged or the air conditioner will shut down. A temperature rise control method for the power module of the inverter air conditioner is proposed. The maximum operating frequency of the compressor is limited according to the condition of the AC voltage, which can solve the above problems.

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