Double-transistor flyback converter and primary side current sampling double-closed-loop digital control method thereof

• Main Authors: LIU ZHANGHUA, XIAO XIAO, WU JINBO, SU MEI, LIANG WENWU, XIONG SHANGFENG, CUI YUJIAO, YU BO, LI LI, NING GUANGFU, OUYANG FAN, LI HUI, JIANG LI, HE ZHIQIANG, XIE GUOSHENG, LI GANG
• Format: Patent
• Language: Chinese; English
• Published: 24.10.2023
• 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 discloses a double-transistor flyback converter and a primary side current sampling double-closed-loop digital control method thereof, and the double-transistor flyback converter comprises an energy absorption circuit which is connected in parallel with an active switching tube and is used for slowing down the drastic change of gate-source voltage when the active switching tube is turned off so as to reduce the stress and turn-off loss of the active switching tube. The energy absorption circuit comprises a diode DSi, an absorption resistor RSi and an absorption capacitor CSi. The diode DSi and the absorption resistor RSi are connected in parallel and then are connected in series with the absorption capacitor CSi. The primary side current sampling double-closed-loop digital control method comprises the steps that voltage feedback serves as an outer loop, primary side current feedback serves as an inner loop, and double closed loops are formed through digital control. According to the double-trans