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This paper introduces techniques to reduce energy storage in off-line light-emitting diode (LED) drivers. Rather than targeting the ideals of unity input power factor (PF) and constant LED current, a topology is selected to minimize the required energy storage with the more practical targets of 0.9 PF and a selectable LED current ripple. The objectives are(More)
This paper introduces an LED driver circuit implemented by series-input-connected converter cells with a common duty cycle control approach operating from a dc voltage bus. With this structure, low-voltage high-frequency ICs and low-profile components can be applied in high-voltage applications. Flexibility is provided for the cells to work under different(More)
This paper presents a technique for reducing energy storage capacitance and achieving high efficiency in off-line LED drivers. A bidirectional second stage is utilized to reduce the required energy storage, allowing use of high quality, long lifetime capacitors without significantly increasing cost. The bidirectional structure reduces losses when compared(More)
This paper introduces an LED drive circuit implemented by series input connected converter cells with a common duty cycle control approach operating from a dc voltage bus. With this structure, low voltage high frequency ICs and low profile components can be applied in high voltage applications. Flexibility is provided for the cells to work under different(More)
This paper introduces a digitally-controlled off-line LED driver based on low-voltage series-input converter modules. The series-input connected modular architecture is adopted to utilize low-voltage high-frequency circuits and low-profile components in off-line applications. Input current is regulated to be constant using a simple controller to achieve 0.9(More)
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