Power factor correct circuit with sectional control function

• Main Authors: ZHANWEI LI, SHAOGUI LUO, GUOLI WANG, XUEGANG ZHAO
• Format: Patent
• Language: English
• Published: 18.01.2006
• 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; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The utility model relates to a power factor correct circuit with a sectional control function, which comprises a PFC booster converter 5, a PFC control circuit 4 and a PFC output voltage sampling circuit 3. The utility model is added with a segment control circuit and is added with a second sampling end to the PFC output voltage sampling circuit. With the segment process to difference input voltage, the segment control circuit can output voltage division signals to the second sampling end of the PFC output voltage sampling circuit and the segment control circuit can finally determine the voltage amount provided to the PFC control circuit sampling end together with sampling PFC output voltage value. With the function of negative feedback control, the PFC control circuit can control the boost proportion of the PFC booster converter and can accomplish the sectional control function of the PFC output voltage. Therefore, the PFC booster converter has low consumption in AC low voltage input and the power supply efficiency with the PFC function can be increased.