Air-conditioner compressor control circuit and variable frequency air-conditioner

Abstract

The invention belongs to the technical field of air-conditioner compressor control, and provides an air-conditioner compressor control circuit and a variable frequency air-conditioner. AC-DC conversion is performed on AC outputted by an AC power supply by a three-level PFC converter so that DC is generated. After power factor correction processing is performed on DC according to a correction control signal outputted by a control module, positive level and negative level are outputted to a three-level inverter via a DC bus. Positive level, negative level and zero level are modulated by the three-level inverter according to an inversion control signal outputted by the control module, and U-phase AC, V-phase AC and W-phase AC are outputted to a motor of an air-conditioner compressor from the U-phase output end, the V-phase output end and the W-phase output end of the three-level inverter respectively so that voltage ripple of the DC bus is reduced, jump range of output voltage is reduced, harmonic wave in current of the motor of the air-conditioner compressor is reduced, torque pulsation of the motor is reduced, and thus objectives of reducing noise level of the air-conditioner and enhancing integral efficiency of the air-conditioner are achieved.

Description

technical field [0001] The invention belongs to the technical field of air conditioner compressor control, and in particular relates to an air conditioner compressor control circuit and an inverter air conditioner. Background technique [0002] At present, air conditioners have been widely used in various fields and occasions, and work efficiency and noise level are important indicators to measure their performance. The existing technology usually uses a two-level circuit topology (including two-level PFC converter and two-level inverter) to control the air conditioner compressor, which has the advantages of simplicity, reliability and mature control, but at the same time there are internal The voltage stress of the switching device is large, the switching loss of the high-voltage switching device is large, the voltage ripple of the DC bus is large, the output voltage jump range of the inverter is large, and the harmonic content in the motor current output by the compressor ...

AI Technical Summary

Problems solved by technology

The existing technology usually uses a two-level circuit topology (including two-level PFC converter and two-level inverter) to control the air conditioner compressor, which has the advantages of simplicity, reliability and mature control, but at the same time there are internal The voltage stress of the switching device is large, the switching loss of the high-voltage switching device is large, the voltage ripple of the DC bus is large, the output voltage jump range of the inverter is large, and the harmonic content in the motor current output by the compressor Larger, larger motor torque pulsation when controlling the compressor, and larger electromagnetic interference. Due to these defects, it will further lead to the problems of high noise and low efficiency of the air conditioner in the working process

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