Variable frequency air-conditioner and motor control system based on Z-source converter

A technology of motor control and converter, which is applied in the direction of control system, AC motor control, and conversion equipment without intermediate conversion to AC, etc. It can solve the problems of output current harmonic distortion, large noise, large motor torque fluctuation, etc., to achieve Eliminate the influence of output current harmonics, long cut-off time, and improve the effect of boosting capacity
CN104113262AActive Publication Date: 2014-10-22GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
Publication Date
2014-10-22

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Abstract

The invention belongs to the technical field of variable frequency air-conditioners, and provides a variable frequency air-conditioner and a motor control system based on a Z-source converter. The motor control system based on the Z-source converter is that surge generated by the variable frequency air-conditioner in starting is inhibited by a soft start circuit so that power supply switch trip-out and device over-current damage caused by instant over-current of a rectification circuit and the Z-source converter can be prevented. Voltage-boosting capacity is ensured to be enhanced via circuit topology formed by the Z-source converter, a switch tube and a filter circuit when conduction duty ratio of the switch tube is less than 0.5. Meanwhile, a motor is driven to operate via an inverter, and wide-range voltage regulation control and power factor correction control of the Z-source converter are realized via controlling the inverter by a control unit so that a pass-through phenomenon of upper and lower bridge arm switch tubes of the inverter is permitted, working safety of the inverter is enhanced, harmonic influence of dead zone time arrangement on output current of the inverter is eliminated, motor torque ripple is reduced and motor noise is lowered.
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Description

technical field

[0001] The invention belongs to the technical field of frequency conversion air conditioners, and in particular relates to a frequency conversion air conditioner and a motor control system based on a Z source converter. Background technique

[0002] In traditional inverter air conditioners, the PFC (Power Factor Correction, power factor correction) circuit used is realized by using BOOST circuit topology. When implementing PFC, the switching tubes in the BOOST circuit have conduction loss and switching loss, and then The conversion efficiency is reduced, and at the same time, the switch tube in the BOOST circuit may be damaged by overcurrent and overtemperature, resulting in poor working reliability of the inverter air conditioner; moreover, the motor of the compressor controlled by the inverter or the DC The motor of the fan is the main part of the inverter air conditioner, and the inverter will be damaged due to control errors or electromagnetic interferenc...

Claims

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