Search Results - power conversion/control

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Method and System for Automatic, Systemic, Performance-Constrained Techniques for Reducing Power Consumption in Computer Systems
This invention will impact the efficiency and reliability of computing systems. Our method and system analyzes system performance data and schedules processor frequencies to reduce power and energy consumption under user-quantifiable constraints. In this way, users can specify how much performance they are willing to sacrifice and the system auto...
Published: 7/25/2016   |   Inventor(s): Kirk Cameron, Rong Ge, Xizhou Feng
Keywords(s): Power Conversion/Control
Category(s): Energy, Computer Software
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
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
Digital Enhanced V2 Control
This innovation presents a new enhanced V2-type constant on-time control architecture with digital implementations for solving the ripple oscillation issues when using small ESR capacitors in a converter. Instead of directly sensing the inductor current, an inductor current ramp estimator with the drift compensation is proposed as adding a virtual...
Published: 9/3/2012   |   Inventor(s): Kuang-Yao (Brian) Cheng, Feng Yu, Paolo Mattavelli, Fred Lee
Keywords(s): Power Conversion/Control
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
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
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
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