Air conditioner EMC (electro magnetic compatibility) optimization circuit, air conditioner controller and air conditioner

Abstract

The invention provides an air conditioner EMC (electro magnetic compatibility) optimization circuit, an air conditioner controller and an air conditioner. The air conditioner EMC optimization circuit comprises a ground wire, a rectifier bridge, a low-impedance path, a PFC (power factor correction) circuit and an inverter circuit, wherein the PFC circuit and the inverter circuit are sequentially connected with the output end of the rectifier bridge. The PFC circuit and the inverter circuit are connected with the ground wire through a distributed capacitor, one end of the low-impedance path is connected with the output end of the rectifier bridge, and the other end of the low-impedance path is connected with the ground wire. According to the air conditioner EMC optimization circuit, the air conditioner controller and the air conditioner, on the premise that the basic architecture of an air conditioner variable-frequency controller circuit is not changed, the low-impedance path is additionally arranged in the controller circuit, the high-frequency common-mode interference noise transmitted from the PFC circuit and the inverter circuit is transmitted to the PFC circuit and the inverter circuit again through the output end of the low-impedance path and the output end of the rectifier bridge, the high-frequency common-mode interference noise can flow back to an interference source and cannot be transmitted to a power line from the ground wire, and therefore the common-mode noise interference transmitted by the controller circuit is reduced, the common-mode current flowing to an LISN (line impedance stabilization network) is reduced, and the EMC test margin is increased.

Description

technical field [0001] The invention relates to an air conditioner EMC optimization circuit, an air conditioner controller and an air conditioner. Background technique [0002] Air conditioners are indispensable electrical equipment in people's daily life, and have various structural forms. With the continuous improvement of the level of industrial design and the application of new technology, new materials, new shapes and new technologies in air conditioners, not only various types of air conditioners have been developed, but also the application of air conditioners in different application scenarios Continuous exploration and technological innovation have been carried out to meet the different needs of users. [0003] Taking frequency conversion air conditioner as an example, the existing external unit controller of frequency conversion air conditioner has high-frequency and high-current alternating circuits such as PFC circuit and motor drive circuit. These circuits will...

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Problems solved by technology

[0003] Taking frequency conversion air conditioner as an example, the existing external unit controller of frequency conversion air conditioner has high-frequency and high-current alternating circuits such as PFC circuit and motor drive circuit. These circuits will generate a lot of noise interference during normal operation. Improvement, the EMC problem of inverter air conditioners has become a pain point for major manufacturers. Most of the existing EMC optimization solutions stop at the level of the whole machine, such as adding magnetic rings on the power cord, etc.

This not only increases the number of structural components at the whole machine level, increases production costs, but also often affects the assembly of related structures, the basic structure of the controller circuit, etc. Waiting for the work to bring a certain degree of difficulty

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