Power factor correction circuit capable of reducing input harmonic content

• Main Authors: HU FENG, HE WENHUAN
• Format: Patent
• Language: English
• Published: 22.10.2014
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The utility model discloses a power factor correction circuit capable of reducing the input harmonic content. The power factor correction circuit comprises a PFC chip, an inductor, a MOS transistor, a diode, a first capacitor, a second capacitor and a resistor, wherein an input terminal of the power factor correction circuit is connected with a terminal of a primary coil of the inductor, the other terminal of the primary coil of the inductor is connected with an output terminal of the power factor correction circuit via the forward diode, a ZCD pin of the PFC chip is connected to the ground via a secondary coil of the inductor and the first capacitor, a CS pin is connected to the ground via the resistor, a GD pin is connected with a grid electrode of the MOS transistor, a drain electrode of the MOS transistor is connected with an anode of the diode, a source electrode of the MOS transistor is connected with the CS pin, and a cathode of the diode is connected to the ground via the second capacitor. According to the power factor correction circuit, the problem of high harmonic content during the high-voltage input is solved, and the cost is low.