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A series resonant tank in the quasi-Z-source (qZS) DC-DC converter with a voltage doubler rectifier could significantly increase the input voltage regulation range by adding the buck mode realization possibility. This paper discusses two different control approaches of the qZS series resonant DC-DC converter in the buck mode: variable frequency control and phase shift modulation. Both methods are...
This paper proposes a high efficiency driving circuit for multiple high-brightness light emitting diode (HB-LED) lamps with dimming feature. A high-frequency half-bridge series resonant inverter is adopted as a current driver. By appropriately controlling the frequency of the active switches and the resonant tank, the lamp currents can be regulated effectively. On the other hand, the LED lamps can...
In this paper, a simple dimming control is presented and applied to a cold cathode fluorescent lamp (CCFL). Traditionally, the digital dimming takes back-and-fro start and cutoff of the CCFL, thereby causing current spike and hence reducing the life of the CCFL. Consequently, to overcome these problems, a dimming strategy is presented according to the frequency shift. Moreover, a full-bridge phase-shift...
This paper presents a class D series resonant inverter with a series capacitor and an auxiliary switch. A capacitor and a switch connected in parallel are added to the series resonant circuit in series, which regulates the output power without frequency modulation. The entire impedance is changed by the difference between the switching frequency and the two resonant frequencies. While the auxiliary...
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