Patent ID: 6781802
Filing Date: 2004-08-24
Classification: H02M

Abstract:
A controlling device of a compressor, comprising:a commercial power source; a motor, for driving a compressor mechanism; an inverter circuit, for converting a commercial frequency to a driving frequency, to control the motor; a noise filter, arranged at an input of the inverter circuit, for suppressing a common mode noise of the commercial power source and the inverter circuit, and connected to a ground through a metal frame used for receiving a compressor main body, wherein the noise filter further comprises first capacitors, second capacitors and common mode reactor coils; and a leakage current suppressing circuit, having a clamper for clamping a voltage, and connected between nodes of the second capacitors and the metal frame, wherein in the noise filter, one end of each second capacitor is connected to an AC power line through a corresponding common mode reactor coil, and the other end of the each second capacitor is connected to the leakage current suppressing circuit, and each of the first capacitors is connected between two of the AC power lines.