Control circuit and control method of air-conditioner outdoor draught fan and air-conditioner

Abstract

The invention discloses a control circuit of an air-conditioner outdoor draught fan. The control circuit comprises an outdoor temperature measurement detecting unit, a condenser pipe temperature detecting unit, a main control unit and a draught fan drive unit. The outdoor temperature measurement detecting unit is used for detecting outdoor environment temperature values when the air-conditioner outdoor draught fan is operated; the condenser pipe temperature detecting unit is used for detecting outdoor condenser coil pipe temperature values when the air-conditioner outdoor draught fan is operated, the main control unit is used for confirming a adjustment range of the rotating speed of the outdoor draught fan according to the outdoor environment temperature values, confirming the initial gear values in the adjustment range of the outdoor draught fan, comparing the outdoor condenser coil pipe temperature values with preset reference temperature, confirming rotating speed adjustment gear values in the adjustment range of the outdoor draught fan, and outputting corresponding rotating speed commands to the draught fan drive unit according to the initial gear values or adjustment gear values; and the draught fan drive unit drives the outdoor draught fan load according to the control commands to adjust the outdoor draught fan to operate in a corresponding speed. The invention further provides an air-conditioner containing the control circuit and a control method of the air-conditioner outdoor draught fan. The control circuit of the air-conditioner outdoor draught fan is low in cost and more stable in system.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a control circuit, a control method and an air conditioner for an outdoor fan of an air conditioner. Background technique [0002] As we all know, equipment or machines in large communication rooms, power distribution rooms or electronic equipment workshops will continue to heat up during operation, which may cause the temperature of equipment and components to rise, thereby shortening the life of equipment or machines. In regions like Russia, South Africa, and northern China, opening the heater in cold winter makes the room temperature too high to make people feel uncomfortable. Therefore, it is necessary to use an air conditioner to adjust the temperature of the equipment or space in such a low temperature environment. Even when the outdoor ambient temperature is very low, the air conditioner is required to cool down the temperature of the equipment or machine, thereby...

AI Technical Summary

Problems solved by technology

However, when the control circuit of an ordinary air conditioner is cooled in a low temperature environment, it is easy to cause frost and ice on the evaporator, and the anti-freeze protection function is frequently started and stopped, resulting in the air conditioner not being able to output the required cooling capacity normally, which cannot meet these special places. needs

Although there are some low-temperature air conditioner devices on the market, the control logic of these air conditioner devices is relatively simple and the control method is relatively rough, and they will be frequently started and stopped during low-temperature cooling, resulting in poor cooling effect and cannot better satisfy customers at low temperature. Ambient Cooling Requirements

[0003] The Chinese patent publication number is CN 201145378 Y, and the patent titled "Fan speed control module for fixed-frequency air conditioner" discloses an outdoor fan speed control device. It keeps changing with the change of fan speed, making the refrigerant temperature and fan speed stable for a long time, and it is not easy to stabilize

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