Brushless DC (direct current) motor air conditioning system control circuit

Abstract

The invention discloses a brushless DC (direct current) motor air conditioning system control circuit comprising a microcontroller U4, an indoor DC fan motor rotational speed control circuit, an outdoor DC fan rotational motor rotational speed control circuit, an outdoor DC motor fixed rotational speed and adjustable rotational speed switching circuit, an indoor motor speed regulation voltage shutdown circuit, an outdoor motor speed regulation voltage shutdown circuit and a temperature detection circuit, wherein the outdoor DC fan motor rotational speed control circuit comprises a first circuit unit and a second circuit unit; the circuit board of the brushless DC (direct current) motor air conditioning system control circuit consists of an outdoor control panel and an indoor control panel; and the outdoor control panel and the indoor control panel are connected through plug connectors CN2 and CN4. The brushless DC (direct current) motor air conditioning system control circuit can perform speed regulation control on the indoor and outdoor fan motors at random to achieve a good heating effect, and match the outdoor motor fixed rotational speed control and closed loop speed regulation control at random so as to improve the development convenience of products.

Description

technical field [0001] The invention relates to a DC brushless motor air conditioning system control circuit. 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 result, the heating ef...

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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