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Light-emitting diodes (LEDs) have largely replaced conventional light circuits, and have been applied in household lighting, smart lighting, and commercial lighting systems. LED driver structures can be divided into single-stage or double-stage power management structures. Previously, systems with a single-stage power management structure, which featured a fixed-frequency structure, were commonly...
This paper presents a Cuk converter fed power factor correction (PFC) based light emitting diode (LED) driver. It is designed for high brightness (HB) low voltage LED driving. A pulse width modulation (PWM) technique is used for current control to achieve different LED brightness level. The PFC Cuk converter is used to feed a dual output flyback DC-DC converter which supplies power to the forced cooling...
A primary side control LED driver with a novel constant current control mechanism is proposed in this paper. In order to simplify the peripheral circuits, the proposed driver employs two cascaded power MOSFETs to eliminate auxiliary winding. The resonance occurs in the transformer will couple to the connection of power MOSFETs. Thus the system can obtain the demagnetization information by sampling...
In order to make the LED driver to meet the requirements of high efficiency, reliability and low cost, this paper presents a single-stage flyback converter. The operation principles of this converter and the parameters of the major components are fully analyzed. The simulation was conducted under different input conditions by the Saber software. The results show that high power factor and high conversion...
This paper presents a constant-current power supply for HB-LED(High Brightness LED). The proposed power supply is designed and implemented by adopting a flyback converter with primary side control and without galvanic isolation. Based on discontinuous conduction mode (DCM), the flyback converter has constant average output current when the peak current on the transformer primary side and the ratio...
This paper demonstrates power electronic drivers for white LED lamps. Due to some obvious features such as high luminous efficiency, low-loss energy, long life, safety, green, and so on, it's expected to replace conventional lamps including incandescent, halogen and fluorescent lamps at least in some general illumination application within the near future. It's always used in automotive fields. Innovative...
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