Search

A new plasma display panel (PDP) sustaining driver using asymmetric resonant poles is proposed. Since asymmetric resonant poles are used for inverting the panel voltage, the flexibility in the rising time and the falling time of the panel voltage is increased. Moreover, all sustain switches are turned on with zero-voltage and a voltage notch across the panel is significantly reduced. Since the proposed circuit is implemented with reduced component counts, it features a simple structure and low cost. The operation principle is presented in detail and a 7.5-in ac PDP equipped with the proposed circuit is investigated. Index Terms--Energy recovery, sustain driver.

A single-stage line-coupled half-bridge ballast with unity power factor and ripple-free input current using a coupled inductor is proposed. The proposed power-factor-correction circuit can achieve unity power factor and ripple-free input current using a coupled inductor. A saturable transformer constituting the self-oscillating drive limits the lamp current and dominates the switching frequency of the ballast. The proposed ballast has high energy efficiency, low cost, and high reliability compared to the conventional high-power-factor electronic ballasts. Experimental results obtained on a 30-W fluorescent lamp is discussed. Index Terms--Electronic ballast, power-factor correction (PFC).

A single-stage electronic ballast with high power factor (HPF) is proposed in this letter. The single-phase boost-type rectifier provides HPF. A saturable transformer constituting the self-oscillating drive limits the lamp current and dominates the switching frequency of the ballast. Experimental results obtained on a 40-W fluorescent lamp are discussed. Index Terms--Electronic ballast, high power factor.