Application Number: 00102789
Application Date: 2000.01.08
Publication Number: 1264215
Publication Date: 2000.08.23
Priority Information: 1999/1/8 KR 281/99
International: H02M5/40;H02M1/00
Applicant(s) Name: LG Electronics Co., Ltd.
Address:
Inventor(s) Name: Han Gyong-Hai;Kim Jong-Ho;Shim Gon
Patent Agency Code: 11105
Patent Agent: huang min
Abstract The present invention relates to a power factor compensation device for a motor driving inverter which can improve a power factor of a voltage and a current inputted to the inverter driving a motor. The present invention detects a zero crossing point of an utility alternating current power, and outputs a driving signal corresponding to a plurality of sine wave form voltage values stored in a memory according to a detection result, when the zero crossing point of the utility alternating current power is detected in a state where the plurality of sine wave form voltage values corresponding to a voltage of the utility alternating current power and frequencies are stored in the memory. A switching transistor is switched according to the driving signal, and the voltage applied to the inverter is switched according to the switching operation, thereby improving the power factor.