Patent
High efficiency resonant switching converters
TLDR
In this article, a PWM-controlled flyback converter with a single transformer and a primary side resonant subcircuit is proposed to minimize reverse recovery losses, where the primary windings are connected in series, the first transformer having substantially greater inductance than the second transformer.Abstract:
Resonant DC to DC power converter topologies include a PWM-controlled flyback converter having a single transformer and a primary side resonant subcircuit that is optimally controlled to minimize reverse recovery losses. A second transformer may be added wherein the primary windings are connected in series, the first transformer having substantially greater inductance than the second transformer to more efficiently transfer energy over a wide range of output load conditions. A combined forward-flyback resonant converter utilizing a load-side buck loop for increased power delivery performance and start-up circuitry for initial power connection of the converter to a voltage source utilizing a hysteresis protection circuit are also disclosed.read more
Citations
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Patent
Method and system for controlling output of RF medical generator
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References
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Proceedings ArticleDOI
Zero-voltage switching in high frequency power converters using pulse width modulation
TL;DR: In this article, a zero-voltage switching technique that utilizes a resonant transition during a short but finite switching interval is described. But, conduction losses are increased because ripple currents are increased and synchronous rectification is required.
Patent
Forward converter switching at zero current.
TL;DR: In this paper, the secondary leakage inductance of a transformer and a capacitor is combined with a rectifier to prevent the LC circuit from becoming a resonant circuit and leads to a unidirectional flow of energy from source to load.
Patent
Optimal resetting of the transformer's core in single ended forward converters
TL;DR: In this article, the transformer's core in single ended forward converters is reset by a "magnetizing current mirror" consisting of a capacitor in series with an auxiliary switch which couples the capacitor to one of the transformer windings to form a resonant circuit with the transformer magnetizing inductance.
Proceedings ArticleDOI
Resonant Switches - A Unified Approach to Improve Performances of Switching Converters
Kwang-Hwa Liu,Fred C. Lee +1 more
TL;DR: In searching for a general "zero-current-Switching" technique for DC-DC converters, the concept of resonant switches is developed and application of the resonant switch concept to conventional converters leads to the discovery of a host of new converter circuits.
Patent
Dc/dc converter switching at zero voltage
TL;DR: In this article, a two-switch DC/DC converter provides sufficient inductive energy storage at the termination of the "on" period of each switch to alter the charge on the intrinsic and stray capacitance of the combination of switches producing zero voltage across the alternate switch prior to its turn on.