Low-voltage working fixed speed air conditioner and control method thereof

Abstract

Low voltage working constant-speed air conditioning machine and the control method of it and it is characterized in that the control circuit concludes a indoor electric engine rotary speed control circuit, a compressor current foldback circuit, on the compressor running capacity sets up a secondary starter PTC in parallel, at the secondary of source transformer T sets up an unit electric network pressure detection tap which is used as the electric network pressure diction port, the outdoor electric engine winding sets up at least two different rotary speed steps interface circuit which correspond different electric network voltage and the outdoor electric engine winding switches in the correspond rotary speed step interface circuit though the relay on the different interface ports. The invention air conditioning machine can start normally and keep running at the voltage condition of 180V even low; at the time of electric network's fluctuation it can avoid of appearing the abnormal noise; it can stop working to protect actively when the voltage is too low also can recovery to the normal running quickly and automatically after the voltage renewed.

Description

technical field [0001] The present invention relates to air conditioners, and more particularly to fixed speed air conditioners as household appliances. Background technique [0002] 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 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...

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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