Bootstrap driving circuit and switching power supply

• Main Authors: RUAN ZEYU, LI FEI, CHEN ZHIHUA, YU ZUOBA
• Format: Patent
• Language: Chinese; English
• Published: 24.05.2024
• 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 relates to a bootstrap driving circuit and a switching power supply, the bootstrap driving circuit comprises a first isolation circuit, a bootstrap circuit, a first driving circuit and a first switching device, the first isolation circuit is configured to transmit a first control signal to the first driving circuit in an isolated manner, and the bootstrap circuit is configured to drive the first driving circuit to work; when the first driving circuit is configured to work, the first switching device is controlled to be switched on and switched off periodically according to the first control signal, so that the isolation of the power device and the control device can be realized by using the high-voltage-resistant isolation circuit, and the influence of the high voltage of the power device side on the control device which is not resistant to the high voltage is reduced; therefore, the bootstrap drive circuit can resist high voltage to meet the requirements of high-voltage application scenarios, a