Search Results - yuancheng (frank) ren

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Gas Separation Membranes Formed By Crosslinking Polyarylene Ethers
Polyarylene ether ketone (PAEK) polymers are known to be stable to hydrolysis and have desirable thermal properties; however, they are susceptible to plasticization by CO2 and hydrocarbons, leading to swelling and a decrease in performance for gas separation applications. The present invention utilizes crosslinking to improve the performance of pol...
Published: 2/10/2014   |   Inventor(s): James Mcgrath, Ruilan Guo, Yu Chen, Benny Freeman
Keywords(s):  
Category(s): Chemicals, Materials
Non-isolated Inductor-less Soft-Switching Bus Converter with Self-Driven
This invention proposes a simple topology for the first stage of non-isolated two-stage applications. The output inductor is eliminated. The magnetizing current is used to achieve ZVS for all switches. By choosing leakage inductance and output capacitance carefully, the turn-off current for the primary switch is very small and ZCS is achieved. Mo...
Published: 9/3/2012   |   Inventor(s): Yuancheng (frank) Ren, Julu Sun, Ming Xu, Fred Lee
Keywords(s): Power Conversion/Control
Category(s): Electrical
Hybrid Filter for High Slew Rate Output Current Application
To meet the stringent specifications of the voltage regulator (VR), hybrid filter concept is proposed. Based on this method, the output capacitance can be dramatically reduced. Meanwhile, the power loss in the linear regulator is not severe any more because it only takes care of high frequency energy. This new filter structure is more cost-effect...
Published: 9/3/2012   |   Inventor(s): Ming Xu, Yuancheng (frank) Ren, Fred Lee, Andrew Schmit
Keywords(s): Electronics
Category(s): Electrical
Inductor-less Soft-Switching Bus Converter with Self-Driven
This invention proposes a simple topology for bus converter application. The output inductor is eliminated. The magnetizing current is used to achieve ZVS for all switches. By choosing leakage inductance and output capacitance carefully, the turn-off current for the primary switch is very small and ZCS for the secondary switches is achieved. Mo...
Published: 9/3/2012   |   Inventor(s): Yuancheng (frank) Ren, Fred Lee, Ming Xu
Keywords(s): Electronics
Category(s): Electrical
Zero-Voltage-Switch Full Bridge with Self-Driven
This invention proposes a high frequency and high efficiency topology. Compared to conventional phase-shift full bridge, the topology is the same and the only difference is the control strategy. Based on the control strategy, Zero-voltage-switch (ZVS) can be achieved. Another benefit from the control strategy is that the gate signal for synchronous...
Published: 9/3/2012   |   Inventor(s): Ming Xu, Fred Lee, Yuancheng (frank) Ren
Keywords(s): Electronics
Category(s): Electrical
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