1-W Isolated Power Transfer System Using Fully Integrated Transformer With Magnetic Core

12 at 20 MHz. The transformer is switched resonantly at 20 MHz using full-bridge LLC circuits to realize efficient power transfer while eliminating the excess radiated emissions with a fully symmetric topology. A multi-mode approach combining pulse width modulation (PWM) control and frequency contro...

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Bibliographic Details
Published inIEEE journal of solid-state circuits Vol. 54; no. 12; p. 3326
Main Authors Yue Zhuo, Ma, Shaoyu, Zhao, Tianting, Qin, Wenhui, Zhao, Yuanyuan, Guo, Yingjie, Yan, Haiyang, Chen, Baoxing
Format Journal Article
LanguageEnglish
Published New York The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 01.01.2019
Subjects
Coils (windings)
Electric noise
Frequency control
Integrated circuits
Magnetic cores
Power efficiency
Power transfer
Pulse duration modulation
Topology
Transformers
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Summary:12 at 20 MHz. The transformer is switched resonantly at 20 MHz using full-bridge LLC circuits to realize efficient power transfer while eliminating the excess radiated emissions with a fully symmetric topology. A multi-mode approach combining pulse width modulation (PWM) control and frequency control enables >1 W output power at an optimal power efficiency. A 5-kV galvanic isolation is achieved through thick polyimide layers between the transformer windings as well as between the windings and the core. The isolated power transfer system is packaged in a small-outline integrated circuit (SOIC) and delivers 1.1-W isolated power and achieves a peak efficiency of 52%, while passing CISPR 22 Class B radiated emissions limits with 5.8-dB margin.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2019.2940333