Abstract
This paper proposes a single-stage, high power-factor light-emitting diode (LED) driver with a self-excited control scheme for the power switches. The self-excited mechanism is accomplished by fetching the driving voltages from a center-tapped transformer. The frequency of the driving voltages is exactly the same as the resonant frequency of the resonant converter, thus synchronizing the resonant frequency with the switching frequency and achieving zero-voltage switching (ZVS) and zero-current switching (ZCS) of power switches. The circuit topology is mainly composed of a half-bridge LC resonant converter, along with a boost-type power-factor corrector (PFC) to fulfill the single-stage structure, meaning that the presented LED driver possesses high power-factor features and low switching loss. Finally, a 40 W prototype circuit is implemented and tested, and the experimental results exhibit a satisfactory performance.
Highlights
Light-emitting diode (LED) lighting has many advantages, such as high lighting efficiency, a compact size, and fast response
Among the various advantages of LED, the most prominent still focuses on its high lighting efficiency, not all questions about the interaction between humans and light emitted by the LEDs have been completely solved [1,2,3]
The proposed circuit topology was derived by integrating a boost converter which functioned as a power-factor corrector (PFC), as well as a series resonant converter outputting a dc voltage to drive an LED
Summary
Light-emitting diode (LED) lighting has many advantages, such as high lighting efficiency, a compact size, and fast response. Aiming to find a cost-effective solution, researchers proposed some single-stage lighting circuits with self-excited control schemes by integrating a PFC and dc-to-dc resonant circuit [14,15,16]. A novel single-stage LED driver with a self-excited mechanism through integration of a boost-type PFC and a half-bridge series resonant converter is proposed. Since MOSFETs are used in the single-stage PFC circuit, the incidence of unequal currents in power switches is far less, meaning the uneven conduction times between the switches can be ignored. The developed self-excited single-stage converter will possess the advantages of having both a high power factor and low switching losses, and is suitable for LED drive application
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