Resonant converter and control method thereof

Details Resonant converter and control method thereof Resonant converter and control method thereof

2006-08-08

2006-08-08

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

Reexamination Certificate

active

07088594

ABSTRACT:
A resonant converter which can realize its easy design, eliminate the need for its adjustment, realize reliable soft switching operation, and increase an efficiency. A driver DRV of a main switching device uses a PLL circuit PLL to apply frequency tracking control in such a manner that a driving frequency fsw is made to track a resonant frequency fr (or 1/N thereof, N being an odd number) and that the phase of the driving frequency fsw leads the current zero phase of the resonant frequency fr always by a desired time. As a result, such an optimum condition can be kept that the main switching device is triggered immediately before the zero-cross point of a resonant current. Thus the resonant converter which can always satisfy the optimum operational conditions, realize soft switching operation, and increase an efficiency can be realized with an easy design and a manufacturing adjustment-free arrangement.

REFERENCES:
patent: 3743919 (1973-07-01), Bingley
patent: 6949915 (2005-09-01), Stanley
patent: 2002-247854 (2002-08-01), None
Multioutput Current-Mode Resonant Converter Using MAGAMP Control, Switching Power Supply System Symposium, 2002, Japan Management Association, pp. C6-2-1 to C6-2-10).

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