Inverter circuit and variable frequency air conditioner

Abstract

The invention provides an inverter circuit and a variable-frequency air conditioner. The inverter circuit comprises a power supply, an LISN detection circuit, an IPM module inverter circuit and a low-impedance open circuit, wherein the power supply is used as a direct-current power supply and outputs direct current; the LISN detection circuit is connected to a power supply, is connected with a power supply ground wire, and is used for detecting the interference information on a power supply line and isolating power grid interference at the same time; the IPM module inverter circuit is arranged on the LISN detection circuit in parallel, alternating current output by the IPM module inverter circuit is used for driving a compressor load to operate, a first end of the IPM module inverter circuit is connected with a positive electrode of a power supply, a second end of the IPM module inverter circuit is connected with a negative electrode of the power supply, the IPM module inverter circuit is used for inverting and outputting direct current outputted by a power supply into three-phase alternating current; and the low-impedance open circuit comprises an output terminal capacitor, and the low-impedance open circuit is connected with the three-phase alternating current and the power ground and is used for forming an EMC interference transmission path with the three-phase winding so as to reduce EMC interference.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to an inverter circuit and an inverter air conditioner. Background technique [0002] Nowadays, the inverter air conditioner external unit controller and the motor drive inverter circuit high-frequency and high-current alternating circuit will generate a lot of noise interference during normal operation. With the continuous improvement of electromagnetic compatibility requirements, the EMC problem of inverter air conditioners has become a major concern for major manufacturers. Pain points. EMC refers to the comprehensive evaluation of the electromagnetic field interference (EMI) and anti-interference ability (EMS) of electronic products. It is mainly divided into two categories: differential mode interference and common mode interference, which mainly affect the outside through conduction and radiation. Among them, the brushless DC motor built in the controller has a high-frequency...

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Problems solved by technology

[0004] In view of this, the present invention aims to propose an inverter circuit and an inverter air conditioner to solve the problem that the EMC optimization scheme of the inverter circuit in the prior art cannot effectively improve the overall EMC of the motor

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