Method and system for headwind speed detection and soft start control of air-conditioning fan

Abstract

The invention belongs to the technical field of air conditioner control, and discloses an upwind rotating speed detection and soft start control method and system for an air conditioner fan. When theupwind rotating speed of the fan does not exceed n1, the fan is normally started, and a fan upwind rotating speed detection circuit is closed; when the upwind rotating speed of the fan is n1-n2, the fan is firstly subjected to soft start until the upwind rotating speed is reduced to be lower than n1, then the fan is normally started, and the upwind rotating speed detection circuit of the fan is closed; and when the upwind rotating speed of the fan is greater than n2, a controller directly sends out a protection signal to forbid the fan to start. According to the invention, the rotating speed of the external fan is detected, different control strategies are carried out according to the rotating speed, the MCU sends out a driving signal at a certain frequency to control an inverter to realize soft start control, and the current in the circuit does not reach an overcurrent value; the working range of the air conditioner external fan is widened, the air conditioner external fan can still be started under the condition of high-speed reverse rotation, and therefore the controller and the motor are protected. A better use effect is provided for users.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning control, and in particular relates to a method and system for detecting and soft-starting the headwind speed of an air-conditioning fan. Background technique [0002] Currently, the closest prior art: [0003] At present, the external fan of the air conditioner does not have the function of detecting the speed of the headwind and is generally placed outdoors. The fan is easily blown by the outdoor wind and rotates, especially in areas with strong sea winds such as coastal areas. When the fan is started, the external fan may be in the reverse state. Directly starting the fan at high speed will easily cause overcurrent and burn out the internal power devices of the IPM. In severe cases, it will cause demagnetization of the motor. [0004] In summary, the problems in the prior art are: [0005] In the existing air-conditioning fan start-up control technology, when the fan is directly start...

AI Technical Summary

Problems solved by technology

[0005] In the existing air-conditioning fan start-up control technology, when the fan is directly started in the high-speed reverse state, the controller will be burned out or the motor will be demagnetized due to the overcurrent of the fan.

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