Outdoor motor control circuit of air conditioning system of brushless motor

Abstract

The invention discloses an outdoor motor control circuit of an air conditioning system of a brushless motor. The outdoor motor control circuit comprises a microcontroller U4, a rotary speed control circuit of an outdoor DC (direct current) fan motor, a fixed rotary speed and adjustable rotary speed switching circuit of an outdoor DC motor and a speed adjusting voltage cut-off circuit of the outdoor motor and a temperature detecting circuit. The rotary speed control circuit of the outdoor DC fan motor comprises a first circuit unit and a second circuit unit, wherein the first circuit unit comprises a plug connecting component CN2; the second circuit unit comprises a plug connecting component CN4; and the first circuit unit is connected with the second circuit unit through the plug connecting components CN2 and CN4. The outdoor motor control circuit disclosed by the invention has the advantages of being capable of randomly regulating and controlling the speed of the outdoor fan motor so as to obtain a better heating effect, and performing random collocation on the fixed rotary speed control and the loop-closed speed adjusting control of the outdoor motor so as to improve the convenience of product development, and the like.

Description

technical field [0001] The invention relates to an outdoor motor control circuit of a brushless motor air-conditioning system. Background technique [0002] The heating capacity of fixed-speed air conditioners and the noise of AC motors have been bothering technicians in the industry, making the use of fixed-speed air conditioners unsatisfactory. In the existing fixed-speed air conditioners, most of the indoor and outdoor fan motors use AC induction motors, and most of the outdoor motors are controlled by one gear of speed. When the power grid voltage is high, the noise of the outdoor motor is too large; when the power grid voltage is low, the speed of the outdoor motor is too low and the heat dissipation effect is poor. Although a small number of high-efficiency fixed-speed air conditioner fans use DC brushless motors, only outdoor fan motors use DC brushless motors, and their control is extremely simple, only providing a fixed driving voltage for the DC motor. As a resul...

AI Technical Summary

Problems solved by technology

[0002] The heating capacity of fixed-speed air conditioners and the noise of AC motors have been bothering technicians in the industry, making the use of fixed-speed air conditioners unsatisfactory

As a result, the heating effect of ordinary fixed-speed air conditioners and the electromagnetic sound of AC motors have been difficult to solve. Even the above-mentioned high-energy-efficiency fixed-speed air conditioners using DC brushless motors only improve the overall energy efficiency of the fixed-speed air conditioners. The thermal effect, especially the heating effect at high and low temperatures is not satisfactory. In the case of high temperature heating, due to the method of turning on the external fan to control the system load, the heating amount fluctuates greatly, the heating effect is not ideal, and the electric energy Great waste

In the case of low-temperature heating, because the external fan adopts the first-speed speed, the speed cannot be changed, resulting in poor low-temperature heating effect of ordinary fixed-speed air conditioners, more frosting, and short effective heating time

This situation greatly affects the use effect of the air conditioner, especially in winter

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