Control method of low voltage operating fixed speed air conditioner

Abstract

The present invention relates to a control method of a low voltage operation constant speed air conditioner, which is characterized in that the rotary speed of an indoor electric motor is adjustable,when the network voltage is changed, a conduction angle of a controlled silicon in a motor-drive circuit is adjusted in order to stabilize the rotary speed of the indoor electric motor, the differentrotary speed shifts of an outdoor electric motor are changeable, under different ranges of the network voltage and / or different external disk temperature of the outdoor condenser, the outdoor electricmotor operates on the different rotary speed shifts, controlling compressor overflowing protection, the closing down overflowing protection of the compressor is fed with the protection current valuelower heat protector before the system heat protector feeds protection, and the batch restart of the compressor are completed within the setting time after feeding protection. The air conditioner of the present invention can be normal starting under 180V even under the condition of lower electric voltage and keep operation, the abnormal noise can be avoided when the electric network fluctuates, and the present invention can be active closing down protection and rapidly be automatic recovery normal running after electric voltage resumption.

Description

[0001] This application is a divisional application with application number: 200710023497.9; application date: June 6, 2007; invention title: low-voltage working constant-speed air conditioner and its control method. technical field [0002] The present invention relates to a control method of an air conditioner, more specifically a control method of a constant speed air conditioner as a household appliance. Background technique [0003] The existence of objective problems such as power shortage and instability of township power grids has made the use of fixed-speed air conditioners unsatisfactory in some areas. In the existing fixed-speed air conditioners, the outdoor motors are controlled by first-speed speed control. Although the speed can be stable under the rated power supply of 220V and 50Hz, the speed will also fluctuate in a wide range as the voltage changes. , resulting in excessive noise from the outdoor motor when the grid voltage is high; and when the grid voltag...

AI Technical Summary

Problems solved by technology

In the existing fixed-speed air conditioners, the outdoor motors are controlled by first-speed speed control. Although the speed can be stable under the rated power supply of 220V and 50Hz, the speed will also fluctuate in a wide range as the voltage changes. , resulting in excessive noise from the outdoor motor when the grid voltage is high; and when the grid voltage is low, the outdoor motor speed is too low and the heat dissipation effect is poor, resulting in ordinary fixed-speed air conditioners in the hot summer, due to the fluctuation of the grid and the peak voltage of power consumption. It is too low and cannot be cooled normally, and frequent "jumping" phenomenon occurs

At the same time, most of the current fixed-speed air conditioners are equipped with a "system protection" function. When a trip occurs, it is judged that the cooling effect of the air conditioner is not good, and it is often put into shutdown protection. Even if the voltage returns to normal, it cannot be automatically reactivated. work, this situation greatly affects the use of air conditioners

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