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This paper presents a simplified envelope model to study the dynamics of a phase-controlled resonant converter suitable to drive light emitting diode (LED) lamps. The approximate closed form of the transfer function is obtained from the proposed reduced-order model. The fast dynamics of the resonant converter allows us implementing a pulsed current source with active control of the on-time-current...
This paper presents a simplified envelope model to study the dynamics of a phase-controlled resonant converter suitable to drive light emitting diode (LED) lamps. The output current is controlled, at constant switching frequency, through the phase displacement, Ψ, of the control signals of each class D section of the resonant inverter stage. The envelope model of the resonant network is reduced to...
This paper presents the analysis and design of a new configuration of a resonant inverter suitable for high-pressure sodium lamp ballast applications. The proposed inverter is the result of the parallel connection of five class D LCsCp resonant inverters. Since the load current is shared among five equal sections, the circuit is able to drive lamps over 1 kW using low-cost power MOSFETs and achieves...
The paper proposes a robust resonant ignition technique for low frequency square wave (LFSW) ballasts without requiring additional igniter components or increase in component size or weight. The LC filter of the LFSW ballast is used at start-up in a resonant mode for lamp ignition. In order to achieve the high voltage gain required for lamp ignition, significantly higher current and volt-seconds are...
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