Search Results - shu+ji

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Optimal Trajectory Control of LLC Resonant Converter for LED PWM Dimming
In this invention, a novel PWM dimming solution for the LED lighting is proposed. With the PWM dimming control, the LED intensity is controlled by the ratio between the on-time and off-time of the PWM dimming signal. When the PWM dimming is on, the LLC resonant converter operates under the full load condition. To eliminate the dynamic oscillation when...
Published: 9/5/2012   |   Inventor(s): Weiyi Feng, Fred Lee, Shu Ji
Category(s): Electrical
Multi-Channel Constant Current LED Driver with Coupled Inductor
Light-Emitting Diodes (LEDs) have emerged as promising lighting devices for the future. LEDs are widely used in residential and commercial applications like indoor/outdoor lighting and television backlighting. Different from the traditional incandescent and fluorescent lighting sources, LEDs need constant current source to maintain the brightness...
Published: 9/3/2012   |   Inventor(s): Shu Ji, Haoran Wu, Fred Lee
Keywords(s): Power Conversion/Control
Category(s): Electrical