MHz zero‐voltage‐switched isolated resonant converter for wide‐output‐voltage application

Abstract

This study proposes a MHz isolated resonant converter, which achieves buck-boost DC/DC conversion, zero-voltage switching and the resonant components absorb the parasitic parameters. The DC analysis method and MATLAB computational algorithm are proposed for acquiring the specific circuit characteristics, including the voltage conversion ratio, the rms value of switch current and peak voltage of the semiconductors. The active power and apparent power are also analysed to provide design basis of optimising efficiency. The proposed converter shows greater advantages on voltage stress, current stress and efficiency over traditional isolated Sepic multi-resonant converter. A wide-output-voltage prototype based on the proposed converter was built in the lab and the experimental results verify the theoretical analysis well.

Multi‐channel LED driver based on switched‐controlled capacitor with constant frequency control

“…δ is a phase angle that the voltage v p 2 leads the current i r . Also, the time interval is t δ =φ/ω s ( ω s = 2π × f s ) to achieve zero‐voltage switch (ZVS) for active switches of Q 1 , Q 2 and S [28]. The current flowing through the capacitor C s is i cs , the voltage across capacitor C s is v cs , and the voltage over switch S is v s .…”