Search Results - weiyi feng

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Adaptive SR Driving Scheme for Resonant Converter
In this invention, adaptive SR driving for resonant converter using ripple counter concept is proposed. With the proposed method, SR drain to source voltage Vds is sensed to detect the body diode conduction and SR is well tuned to eliminate the body diode conduction within all operation regions of resonant converter in different applications. Tow c...
Published: 3/30/2015   |   Inventor(s): Chao Fei, Fred Lee, Weiyi Feng, Qiang Li
Keywords(s):  
Category(s): Electrical, Energy, Engineering
Multi-Step Simplified Optimal Trajectory Control (SOTC) Based on Only VO and ILoad
In this invention, multi-step Simplified Optimal Trajectory Control (SOTC) based on only VO and ILoad is proposed to solve the challenges in the control of resonant converter. The main concept involved in this invention is that adaptive multi-step SOTC based on controller's performance is employed to settle resonant tank. The proposed method has a ...
Published: 2/27/2015   |   Inventor(s): Chao Fei, Fred Lee, Weiyi Feng, Qiang Li
Keywords(s):  
Category(s): Electrical, Energy, Engineering
Multi-Channel Constant Current LED Driver with Coupled Inductor (CIP of VTIP 10-095)
The future LED drivers should be suitable for changeable LED numbers and changeable LED strings. Meanwhile, it should keep high efficiency while having a wide range dimming. Thus, a two-stage structure is proposed based on previous invention (VTIP 10-095). The second stage converter is always operating on an optimally designed point to achieve the ...
Published: 5/9/2013   |   Inventor(s): Weiyi Feng, Fred Lee
Keywords(s):  
Category(s): Electrical
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 w...
Published: 9/5/2012   |   Inventor(s): Weiyi Feng, Fred Lee, Shu Ji
Keywords(s):  
Category(s): Electrical
Optimal Trajectory Control of LLC Resonant Converter for Soft Start-Up
In this invention, the optimal control of LLC resonant converter for the soft start-up is proposed. Several control approaches are invented to settle the initial condition at the start-up moment based on the state-trajectory analysis. During the soft start-up process, the current limitation band is set. The optimal frequency is determined with the ...
Published: 9/5/2012   |   Inventor(s): Weiyi Feng, Fred Lee
Keywords(s):  
Category(s): Electrical
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