Search Results - ming xu

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Proposed Multi-Element Resonant Converters
The necessity of developing high frequency, high power density converters with very high efficiency for distributed power supply systems, leads to the wide applications of resonant converters. Resonant dc-dc converters are becoming more and more popular in the power electronics field. Resonant converters can achieve zero-voltage-switching or zero-c...
Published: 9/20/2012   |   Inventor(s): Dianbo Fu, Fred Lee, Ya Liu, Ming Xu
Keywords(s): Power Conversion/Control
Category(s): Electrical
Adaptive On-Time Control for PFC Light Load Efficiency Improvement
Light load efficiency of a power factor correction circuit is improved by adaptive on-time control and providing for selection between a continuous conduction mode and a discontinuous conduction mode wherein the discontinuous conduction mode increases time between switching pulses controlling connection of a cyclically varying voltage to a filter/i...
Published: 9/14/2012   |   Inventor(s): Qian Li, Fred Lee, Ming Xu, Chuanyun Wang
Keywords(s): Microelectronics
Category(s): Electrical
Interleaved Inductor-Less Resonant Converters with Auto Transformer
CPES proposed inductor-less resonant converter has high efficiency. However, the output voltage ripple is huge since it uses the leakage inductor resonating with output capacitor. This invention solved the ripple problem by interleaving two-phase and use autotransformer to do the voltage averaging. The simulation result demonstrates that the rip...
Published: 9/11/2012   |   Inventor(s): Ming Xu, Julu Sun, Fred Lee
Keywords(s): Electronics
Category(s): Electrical
Switching Capacitor ZVS-PWM DC/DC with Self-Driven SE
A novel switching capacitor PWM converter is proposed. The converter is a combination of a switching capacitor converter and a PWM converter, and it has the following advantages: 1) Zero voltage switching of all the MOSFETs. 2) Self-driven to eliminate SR drivers and save drive loss. Therefore there is no need to adjust the synchronous rectifie...
Published: 9/3/2012   |   Inventor(s): Ming Xu, Ke Jin, Fred Lee
Keywords(s): Power Conversion/Control
Category(s): Electrical
Novel Interleaving Strategy for Multi-Channel PFC
Interleaving multi-phase PFC to reduce the input ripple current is a very popular technology for the AC-DC switching mode power supply. With smaller input ripple current, the EMI filter size can be reduced so that higher power density can be achieved. However, by applying this interleaving technology for today’s AC-DC power supply, the EMI ...
Published: 9/3/2012   |   Inventor(s): Chuanyun Wang, Ming Xu, Fred Lee
Keywords(s): Electronics
Category(s): Electrical
Proposed Digital Constant On-Time Control
Digital power supplies are becoming more and more popular in the power electronics field. Power supplies with digital control can overcome many drawbacks of those with analog control and provide more functions easily to improve the whole system performance, such as passive components reduction, noise immunity, reprogrammability, communication and ...
Published: 9/3/2012   |   Inventor(s): Jian Li, Yang Qiu, Ming Xu, Fred Lee
Keywords(s):  
Category(s): Electrical
Novel Non-Isolated Bus Converters
With switching capacitor technology, a family of non-isolated bus converter without output voltage regulation can greatly increase efficiency, especially at light load. Without the magnetic component or with tiny inductor, the proposed bus converters can realize about 10X power density than the conventional approach. With these compelling traits,...
Published: 9/3/2012   |   Inventor(s): Ming Xu, Julu Sun, Fred Lee
Keywords(s):  
Category(s): Electrical
Proposed Hybrid Control Method for Digital PWM
This invention proposes a new DPWM control method. This method combines the ideas of constant frequency and constant on-time control. On the one hand, this method can achieve the same duty cycle resolution of constant on-time control, which is much higher than constant frequency control; on the other hand, it keeps the switching frequency nearly ...
Published: 9/3/2012   |   Inventor(s): Jian Li, Dong Sam Ha, Yang Qiu, Ming Xu, Fred Lee
Keywords(s): Communications
Category(s): Electrical
DCR Current Sensing Method for Adaptive Voltage Positioning in Coupled Inductor Voltage Regulators
The conventional current sensing method with sensing resistors produces additional losses and decreases the efficiency in the multiphase DC-DC converters with coupled inductors. A novel lossless current sensing method in multiphase DC-DC converters with coupled inductors is proposed. With this novel method, the additional loss is saved and the ef...
Published: 9/3/2012   |   Inventor(s): Yan Dong, Ming Xu, Fred Lee
Keywords(s):  
Category(s): Electrical
Coupled-Inductor Technique for Multi-phase VRs
Coupling the output indictors of the multi-phase Buck can reduce the steady-state current ripple while maintaining the same transient response. The conduction losses in the switches can thus be reduced. The air gap in the center leg more evenly distributes the flux, which can reduce the core loss in the center leg. Furthermore, using coupled ind...
Published: 9/3/2012   |   Inventor(s): Jinghai Zhou, Fred Lee, Ming Xu, Yan Dong
Keywords(s): Electronics
Category(s): Electrical
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