Search Results - jinghai zhou

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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
Using JFET as Synchronous Rectifier to Achieve High Efficiency at High Frequency for Future VRM
This invention disclosure proposed a JFET based buck converter with the targets to eliminate body diode conduction loss and to reduce gate driver loss of synchronous rectifier. A self-driven scheme is used to ensure there is no dead time between the top switch and the bottom JFET in the circuit, and gate driver loss is greatly reduced by connecting...
Published: 9/3/2012   |   Inventor(s): Ming Xu, Julu Sun, Jinghai Zhou, Fred Lee
Keywords(s): Electronics
Category(s): Electrical
Current Senseless AVP Method for Future VRM
A novel method to achieve Adaptive Voltage Positioning (AVP) without any current sensing scheme is proposed. The accuracy of this method is better than the conventional MOSFET Rds sensing and inductor DCR sensing. No current control loop is needed to actively set the output impedance so that the stringent load line defined by Intel microprocessor...
Published: 9/3/2012   |   Inventor(s): Ming Xu, Fred Lee, Jinghai Zhou
Keywords(s): Electronics
Category(s): Electrical
High-Efficiency Self-Driven Technique for Non-Isolated 12V VRs
The concept of self-driven for synchronous rectifier devices was widely used in isolated topologies, where the voltage across the secondary winding can be used, or partially used as the gate driving source for the rectifiers. The main benefit of self-driven is that the driving circuit is simplified, which results in a low cost solution. However, in...
Published: 9/3/2012   |   Inventor(s): Jinghai Zhou, Ming Xu, Fred Lee
Keywords(s): Power Conversion/Control
Category(s): Electrical
Multi-phase Interleaving Isolated DC/DC Converter
This invention proposes a high output current and high efficiency topology. Compared to a conventional phase-shift full bridge with Current-Doubler rectifier, the proposed Zero-Voltage Switch Multi-phase Interleaving Isolated DC/DC Converter reduces the synchronous rectifier conduction loss as well as the transformer winding loss. Furthermore, th...
Published: 9/3/2012   |   Inventor(s): Ming Xu, Fred Lee, Jinghai Zhou
Keywords(s): Electronics
Category(s): Electrical
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