Abstract
A new type of high power LED drivers is proposed by adopting an improved two-stages non-isolated configuration. In order to improve power factor and achieve accurate average current control under universal input voltages ranging from 100 Vrms to 240 Vrms, the power factor correction and average current mode control methods operating in continuous current conduction mode are designed and implemented. With the LUMILEDS emitter type LEDs, a laboratory prototype is built and measured. And from the measured results, it could be concluded that the proposed driver has many better performances such as high power factor, low current harmonic, accurate average current control and switch protection.
Highlights
In today’s world of lighting applications, many electronic engineers are striving to find out a more energy efficient and cost effective way of driving a lighting source
In order to improve power factor and achieve accurate average current control under universal input voltages ranging from 100 Vrms to 240 Vrms, the power factor correction and average current mode control methods operating in continuous current conduction mode are designed and implemented
The boost power factor correction (PFC) circuit operates in conduction mode (CCM) with trailing edge modulator, while the leading edge modulation is adopted in the Buck pulse width modulation (PWM) constant average current control circuit
Summary
In today’s world of lighting applications, many electronic engineers are striving to find out a more energy efficient and cost effective way of driving a lighting source. A new type of lighting sources that has a great potential to replace existing lighting sources such as incandescent and fluorescent lamps in the future is the power lighting emitting diode (LED), which is due to its merits: higher efficiency, superior longevity, continuously-improving luminance and environment friendly [1,2,3]. This interest in LEDs has prompted many power electronic designers to work on driving LED at higher power factor and output current so that it can be applied broader in lighting applications. With the goal to achieve higher power factor and LED constant average current control, the Boost-Buck converter with higher power rating operating in continuous current conduction mode (CCM) with average current mode control (ACMC) is proposed through adding two control blocks: PFC control and ACMC block
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