Flyback transformer leakage inductance energy absorption and feedback circuit

• Main Authors: YU HONGBIN, ZHAO YI, YANG BO
• Format: Patent
• Language: English
• Published: 17.06.2015
• 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; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

A flyback transformer leakage inductance energy absorption and feedback circuit is characterized in that the leakage inductance energy absorption and feedback circuits are integrated together, the integrated circuit is composed of a clamper tube Sc and a clamping capacitors Cc, and is simple and reliable in structure. A control method of the flyback transformer leakage inductance energy absorption and feedback circuit is that the clamper tube is conducted for time Tc after a flyback main tube is turned off, and the Tc is a half of the resonance cycle of an leakage inductor and the clamping capacitor and is much less than the turn-off time of the main tube. By the resonance of the clamping capacitor and the leakage inductor, the leakage inductance energy absorbed by the clamping capacitor is released to a main power circuit, thereby reducing the turn-off voltage peak of a flyback circuit main tube effectively, and improving the efficiency of a flyback converter. Meanwhile, the conduction time of the clamper tube is much less than the turn-off time of the main tube because of the non-complementary conduction of the clamper tube and the main tube, so that the absorption and feedback circuit does not influence the on-off process of the main tube, and is suitable for a flyback circuit of any working mode. By adopting a miniature photovoltaic grid connected inverter of the scheme of the utility model, the reliability and efficiency of the circuit are both improved greatly.