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This paper proposes a novel LED driver, which consists of an isolated single-switch AC-DC converter with power factor correction (PFC) suitable for streetlight applications. Theoretical analysis of operational modes for the presented LED driver is included. In addition, a 65W-rated prototype circuit of the proposed LED driver with an input utility-line voltage of 110 V has been implemented and tested...
A full-bridge single-stage high power-factor charging circuit has accomplished a lithium battery charger. With no extra design effort required, the presented charger possesses Reflex charging function. Unlike the inherited resistive power dissipation of Reflex charging method, the developed circuit transfers the energy from the battery to an inductive component and return to battery later to fulfill...
A microcontroller-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented in this paper. The main circuit consists of a class D converter and a resonant circuit to form a resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start and smooth dimming feature. Moreover, we not only discuss the lamp model,...
This paper proposes a novel single-stage light-emitting diode (LED) driver with coupled inductors and interleaved power-factor correction (PFC), suitable for streetlight applications. The presented LED driver integrates an interleaved boost PFC converter with coupled inductors and a half-bridge-type series-resonant converter cascaded with a full-bridge rectifier into a single-stage power-conversion...
In this paper, A MCU-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented. The used two stage system consists of a power factor corrector and a class D resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve digital control feature. Moreover, we not only discuss the lamp model, derive the frequency characteristics,...
An impulsed-power supply used to eliminate arcing phenomenon and to maintain lamp luminance for field emission lamp is presented in this paper. To compact the system configuration and to reduce the system cost, the flyback topology is employed as the main circuit. Next, the phase-locked loop technique is embedded as a feedback mechanism in this study. With the proposed control mechanism, the peak...
This paper proposes a novel two-stage electronic ballast used to supply automotive high-intensity-discharge (HID) lamps with low-frequency square-wave sources. The ballast is composed of a boost-flyback converter with two output windings plus cascaded voltage doublers to boost up the 12V input voltage to a high DC voltage level of 400 V, and a high-frequency combined with low-frequency square-wave-driven...
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...
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...
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