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The digitally dimming control method is suitable for lighting application in buildings, offices, conference rooms and classrooms, and it features remote control capability. The conventional RS-232-based digitally dimmable lighting system for two-area fluorescent lamps consists of two power factor correctors and two half-bridge resonant inverters as the main circuit, and a microcontroller-based driver...
The digitally dimming control interface is a new kind of dimming control for a variety of lighting applications, including building, office, and conference room; it also features remote control, real-time dimming control and lamp condition recognition. The conventional RS-232-based digitally dimming lighting system for fluorescent lamps consists of a power-factor corrector and a half-bridge resonant...
This paper presents a constant power controller for use in the DC-AC inverter of an electronic ballast for high-intensity-discharging (HID) lamps. The proposed DC-AC inversing stage is a high-frequency combined with low-frequency square-wave-driven half-bridge-type inverter with a constant lamp power control scheme; it supplies the HID lamp with low-frequency square-wave sources to avoid acoustic...
The paper presents and analyzes the efficiency of a 150 W LLC resonant converter in order to compare with the results obtained with a conventional 150 W flyback version. The experimental results of the LLC resonant converter show a maximum efficiency of 94%, and an efficiency of 92% under a full-load condition. Using the presented theoretical equations and design methods, the power losses of the LLC...
This paper presents a two-stage, high-power-factor electronic ballast for high-intensity-discharging (HID) lamps. The presented ballast is composed of a boundary-conduction-mode (BCM)-operated buck-boost-flyback converter to achieve input current shaping, and a high-frequency (20 kHz) combined with low-frequency (200 Hz) square-wave-driven half-bridge-type inverter to supply the lamp with low-frequency...
This paper proposes a two-stage electronic ballast used to supply automotive high-intensity-discharge (HID) lamps with a digitally constant lamp-power control scheme. The ballast is composed of a buck-boost-flyback converter to provide negative voltages and a full-bridge-type inverter for supplying low-frequency square-wave sources to the lamp without incurring acoustic resonance. This paper presents...
This paper presents a novel low-cost, two-stage, negative-voltage-driven electronic ballast used to drive automotive high-intensity-discharging (HID) lamps with a constant lamp-power control scheme. The presented ballast is comprised of a buck-boost-flyback converter to provide negative voltages and a half-bridge-type inverter to supply the lamp with low-frequency square-wave voltage/current. Owing...
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