Dead-time-modulated synchronous PWM controller for dimmable...

Details Dead-time-modulated synchronous PWM controller for dimmable... Dead-time-modulated synchronous PWM controller for dimmable...

2006-06-20

2006-06-20

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

C315S300000, C315SDIG002

Reexamination Certificate

active

07064497

ABSTRACT:
A Synchronous PWM controller realized by dead-time modulation is provided for applying to the self-oscillation Royer inverter. The proposed dead-time-modulated PWM (DTM-PWM) controller is composed of a monostable circuit and a constant-current charger (CCC). The presented switching period for the buck regulation consists of a referred sawtooth having a constant-period and a dead-time. The synchronizing strategy is conducted by modulating the dead-time according to the resonant frequency of the Royer inverter. Two kinds of the control strategies in DTM-PWM controller are explored including the down-going and up-going error voltage controls. A DTM-PWM controlled dimmable Royer inverter with two-CCFL having primary-side control is designed and realized. Two kinds of the existing controllers for the Royer inverter are also experimented and compared with the proposed DTM-PWM controller. The results of the analysis and the theoretical prediction are verified with the experiments.

REFERENCES:
patent: 6013969 (2000-01-01), Noma et al.
patent: 6864643 (2005-03-01), Min et al.
patent: 2005/0093476 (2005-05-01), Gray
patent: 2005/0243580 (2005-11-01), Lyle, Jr.

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