No abstract

No abstract

No abstract

No abstract

No abstract

No abstract

A dimmable high-power-factor electronic ballast is proposed in this paper. The electronic ballast is intended to feed a 100 W electrodeless fluorescent lamp (EFL) at 250 kHz. The proposed topology consists of a Ćuk converter, as power factor correction (PFC) stage, associated with a resonant half-bridge inverter, used as lamp power control (PC) stage. In this work, the integration of both stages is proposed in order to reduce the number of active switches, as well as to simplify the required driving and control circuitry for this application. The dimming system is implemented by the shared switch duty ratio control, attaining a power variation from 100 W to 42 W. The implemented topology achieved a high power factor (PF), varying between 0.984 and 0.978. The line current total harmonic distortion (THD) varied from 17.538% to 11.941%, while the measured efficiency was around 80%.

Summary Zero‐voltage‐switching boundaries of dual‐active‐bridge (DAB) converter operating with phase‐shift modulation is largely studied in literature. However, several practical considerations are neglected to simplify the ZVS analysis. This paper proposes the full analysis of DAB converter ZVS range considering the switches capacitance, dead time, series inductance design, and input/output voltage variation. Three different designs of series inductance were developed. The prototypes were tested under different voltage conditions considering the whole power range. The experimental results show the considerable difference in ZVS region of the classical analysis and the proposed in this paper, proving the feasibility of the paper analysis.