Self‐oscillating current‐fed inverter with low switching loss for wireless power transfer. Issue 14 (1st July 2017)

• Record Type: Journal Article
• Authors: Kwon, Y.; Ahn, D.
• Is Part Of: Electronics letters. Volume 53:Issue 14(2017)
• Page Start: 949
• Page End: 951
• Publication Date: 2017-07-01
• Subjects: radiofrequency power transmission -- invertors -- zero voltage switching -- MOSFET; self‐oscillating current‐fed inverter -- low switching loss -- zero‐voltage switching topology -- wireless power transfer application -- floating‐capacitor connection -- differential MOSFET outputs -- antiparallel diodes -- resonance capacitors -- MOSFET ground -- switching loss reduction; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2017.0760
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A zero‐voltage switching topology for self‐oscillating current‐fed resonant inverter for wireless power transfer application is proposed. The drawback of conventional floating‐capacitor connection between two differential MOSFET outputs is revealed. It turns out that the conventional connection causes severe switching loss because the MOSFET voltage has duty cycle >50%, while the current has an exact 50% duty cycle to sustain the self‐oscillation. To solve the issue, the proposed self‐oscillating inverter equips with two antiparallel diodes and two resonance capacitors between MOSFET output and ground, while the floating capacitor is removed. This allows dead‐time of MOSFETs and zero‐voltage switching, leading to significant reduction in switching loss. The operation and efficiency of the proposed circuit is demonstrated by simulation and measurements.