Title :
Three level LLC series resonant DC/DC converter
Author :
Gu, Yilei ; Lu, Zhengyu ; Qian, Zhaoming
Author_Institution :
Coll. of Electr. Eng., Zhejiang Univ., Hangzhou, China
Abstract :
Paper presents a three level soft switching LLC series resonant DC/DC converter. ZVS is achieved for each main switch without any auxiliary circuit. Voltage stress of each main switch is half of input voltage. ZCS is achieved for rectifier diodes. Wide input/output range can be achieved under low frequency range because of two-stage resonance. Only one magnetic component is needed in this converter. Efficiency is higher in high line input, so this converter is fit for power products with hold up time requirement. The principle of operation and the characteristics of the new converter are analyzed and verified on a 500 V∼700 V input 54 V/10 A output experimental prototype, whose efficiency is 94.1% at rating condition.
Keywords :
DC-DC power convertors; rectifying circuits; resonant power convertors; semiconductor diodes; switching convertors; 10 A; 54 V; DC-DC converter; ZCS; ZVS; magnetic component; rectifier diodes; soft switching LLC series resonant; two-stage resonance; voltage stress; zero current switching; zero voltage switching; DC-DC power converters; Diodes; Frequency; Magnetic resonance; Rectifiers; Stress; Switches; Switching circuits; Zero current switching; Zero voltage switching;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2004. APEC '04. Nineteenth Annual IEEE
Print_ISBN :
0-7803-8269-2
DOI :
10.1109/APEC.2004.1296086
