Common-mode interference suppression device, variable-frequency electric appliance and common-mode interference suppression method thereof

Abstract

The invention discloses a common-mode interference suppression device, a variable-frequency electric appliance and a common-mode interference suppression method thereof. The common-mode interference suppression device is used for the variable-frequency electric appliance. The variable-frequency electric appliance comprises a compressor and a draught fan motor. The common-mode interference suppression device comprises a magnetic coupling assembly; the magnetic coupling assembly is arranged between the compressor feed line and compressor inverter bridge of the compressor as well as between the draught fan feed line and draught fan inverter bridge of the draught fan motor and is used for generating a magnetic coupling effect, so that the common-mode loop impedance of the compressor feed lineand the draught fan feed line is improved, and therefore, the common-mode interference of the compressor and the draught fan motor is suppressed. With the common-mode interference suppression device,the variable-frequency electric appliance and the common-mode interference suppression method provided by the technical schemes of the invention adopted, the problem of EMI interference of a draught fan motor with a variable frequency or chopping control function can be solved, and the EMI interference can be suppressed.

Description

technical field [0001] The invention belongs to the technical field of electric motors, and in particular relates to a common-mode interference suppression device, a frequency conversion electrical appliance and a common-mode interference suppression method thereof, in particular to a magnetic coupling method for suppressing common-mode interference and a frequency conversion electrical appliance. Background technique [0002] In inverter air conditioners, inverter refrigerators, freezers and other equipment, the fan motor is often a neglected interference source of electromagnetic interference (EMI). It can transmit interference signals to the equipment through the transmission line, which interferes with the normal operation of the equipment; then transmits the interference signal to the power grid and interferes with other proper functioning of networked devices. [0003] Fan motors often use asynchronous motors, permanent magnet motors, and brushless DC motors with frequ...

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Problems solved by technology

[0005] The purpose of the present invention is to address the above defects, to provide a common-mode interference suppression device, a frequency conversion electrical appliance and a common-mode interference suppression method to solve the problem of EMI interference in fan motors with frequency conversion or chopping control, and to achieve EMI suppression interference effect

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