Air conditioner, AC asynchronous motor control circuit and method

Abstract

The invention belongs to the technical field of motor control, and provides an air conditioner, an AC asynchronous motor control circuit and a method. The AC asynchronous motor control circuit provided by the invention comprises a current sampling module, a voltage feedback module, a main controller, a driving module and a chopper module. The circuit structure is simple, and the cost is low. The current sampling module samples stator currents of an AC asynchronous motor and outputs sampling currents to obtain corresponding sampling voltages through the voltage feedback module, the main controller obtains a chopper control angle from a preset database according to the sampling voltages and outputs corresponding driving signals to the driving module according to the chopper control angle, and the driving module, according to the driving signals, enables the chopper module to adjust the stator voltages of the AC asynchronous motor according to the chopper control angle so as to enable the AC asynchronous motor to run according to a rotation speed corresponding to the stator voltages, such that high-precision stepless speed control for the AC asynchronous motor can be realized.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to an air conditioner and an AC asynchronous motor control circuit and method thereof. Background technique [0002] During the operation of the AC asynchronous motor, its speed is greatly affected by the load, the speed is low when the load is large, and the speed is high when the load is small. At present, in the prior art, the AC asynchronous motor used to drive the cross-flow fan on the household air conditioner is a PG (pulse generator, pulse generator) motor. The Hall sensor detects the motor speed through the Hall sensor, and then feeds the speed detection signal back to the main control chip, and finally the main control chip adjusts the drive signal to the AC asynchronous motor to achieve the purpose of stabilizing or adjusting the speed. Although the above-mentioned prior art has the advantage of high motor speed control accuracy, the cost of the motor i...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an AC asynchronous motor control circuit, aiming to solve the problem existing in the prior art that the motor cannot be controlled with high precision at low cost

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