| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 98 === This thesis presents a novel single-stage charge-pump power-factor-correction (CPPFC) electronic ballast for the metal halide (MH) lamp. The ballast is driven with the low-frequency square-wave current to avoid the acoustic-resonance problem.
Most electronic ballasts for the MH lamp are composed of two or three power converter stages, which require a complicated control scheme and more circuit-component count. In order to simplify the topologies of the conventional electronic ballasts for the MH lamp, the CPPFC technique is applied to the full-bridge inverter of the conventional two-stage electronic ballast. Therefore, a novel single-stage CPPFC electronic ballast for the MH lamp is developed in this thesis.
The design considerations for the charge-pump (CP) components are proposed according to the analysis of the operational principles for the proposed electronic ballast. Furthermore, the main inductor in the full-bridge inverter has been designed to operate at the boundary conduction mode (BCM) condition in order to reduce the turn-on switching losses on the high-frequency switches.
Finally, a prototype circuit of a 35W single-stage CPPFC electronic ballast for MH lamp is implemented to verify the design guidelines and circuit performances.
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