Buck converter circuit provided with soft switch and sequence control method thereof

• Main Authors: DONG MI, DONG HUI, YANG JIAN, LIU XINGYAN, WAN JIANGHU, CAO YU
• Format: Patent
• Language: Chinese; English
• Published: 24.05.2017
• 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 Buck converter circuit provided with soft switch and a sequence control method thereof. The Buck converter circuit comprises a soft switch branch and an auxiliary inductor Lr. The soft switch branch is connected in parallel between a branch 1 and a branch 2; and the auxiliary inductor Lr is connected in series between a power MOSFET Q1 and a power MOSFET Q2 in the branch 2. According to the method, freewheeling starts at a current peak point of a main inductor through the soft switch branch, and an auxiliary capacitor stores energy; and the soft switch branch in the circuit is connected, the energy stored in the auxiliary capacitor partially feeds back to a power supply, and in the process, soft switching of the power MOSFETs Q1, Q2 and Qr is realized. The circuit is effective and reduces switch loss reliably, meanwhile, saves a lot of heat loss and improves operation stability of the switch device, conversion efficiency of the circuit and safety of equipment using the circuit. 本发明公开