Switching power supply and bootstrap power supply circuit thereof

• Main Authors: NIU HAILING, TAO MIN, LUO QIANG
• Format: Patent
• Language: Chinese; English
• Published: 17.11.2023
• 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; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention provides a switching power supply and a bootstrap power supply circuit thereof. The switching power supply comprises a half-bridge driving circuit. The bootstrap power supply circuit comprises a bootstrap power supply enhancement circuit, an internal low-voltage power supply and a bootstrap capacitor. And when the upper power switch tube and the lower power switch tube of the half-bridge driving circuit are both in a turn-off state, the bootstrap power supply enhancement circuit charges the bootstrap capacitor by using the system input voltage of the switching power supply. When the upper power switch tube of the half-bridge drive circuit is in a turn-off state and the lower power switch tube is in a turn-on state, the bootstrap capacitor is charged by the internal power supply voltage generated by the internal low-voltage power supply. 提供了一种开关电源及其自举供电电路。开关电源包括半桥驱动电路。自举供电电路包括自举供电增强电路、内部低压电源、以及自举电容。当半桥驱动电路的上功率开关管和下功率开关管均处于关断状态时，由自举供电增强电路利用开关电源的系统输入电压对自举电容充电。当半桥驱动电路的上功率开关管处于关断状态且下功率开关管处于导通状态时，由内部低