Search Results - shuo+wang

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Three-Phase EMI Noise Separator
Common mode (CM) and differential mode (DM) components of multi-phase conducted electromagnetic interference (EMI) noise emanating from electronic circuits such as power converters/inverters are separated by respective coupled inductors connected to each phase of three or more phases and which are coupled to each other differently for CM and DM noise...
Published: 9/20/2012   |   Inventor(s): Shuo Wang, Fred Lee
Keywords(s): Electronics
Category(s): Electrical
Design Methods of Noise Separator for Good Wideband Performance
This invention disclosure addresses the design of noise separator for conducted electromagnetic interference (EMI) diagnosis. Traditional EMI diagnosis is trial-and-error, wasting lots of time and money. Starting from the function design in circuits to practical design on component and layout level, this invention disclosure claims the methods developed...
Published: 9/3/2012   |   Inventor(s): Shuo Wang, Fred Lee
Keywords(s): Electronics
Category(s): Electrical
Common Mode Noise Reduction for Power Factor Correction Circuit with Parasitic Capacitance Cancellation
The common mode (CM) noise is caused by the charging and discharging of the parasitic capacitance between the ground and the high dv/dt nodes in the circuits. For switching mode power supply, high dv/dt is inevitable. The parasitic capacitance therefore should be as small as possible. However, power devices consume powers so as to generate heat. Heatsink...
Published: 9/3/2012   |   Inventor(s): Shuo Wang, Fred Lee
Keywords(s):  
Category(s): Electrical
Canceling the Winding Capacitance of Inductors to Greatly Improve its High Frequency Filtering Performance
Winding capacitance of inductors is detrimental to inductor's high frequency performance since high frequency current will bypass the inductance via winding capacitance. An inductor is no longer an inductor but a capacitor at high frequencies, so that it cannot effectively block high frequency current. Reducing or canceling the winding capacitance...
Published: 9/3/2012   |   Inventor(s): Shuo Wang, Fred Lee
Keywords(s): Electronics
Category(s): Electrical
Reducing Common Mode Noise of Power Factor Correction Converters Using General Balance Concept
Common mode (CM) noise in power electronics systems is usually very difficult to control since it is a result from the dv/dt of power switching and the parasitic capacitance between power circuit and the ground, which are unavoidable for a switching power electronics system. This invention introduces a novel idea to greatly reduce the CM noise with...
Published: 9/3/2012   |   Inventor(s): Shuo Wang, Fred Lee, Pengju Kong
Keywords(s): Electronics
Category(s): Electrical
Greatly Improving EMI Filter High Frequency Performances Through the Cancellation of Inductive Couplings and Equivalent Series Inductance (ESL) of Capacitors
Because EMI standards are enforced by governments in the world, all electronic equipment uses EMI filters. The parasitics, including parasitics of components and parasitic couplings between components, affect EM1 filter performance significantly. At high frequency range, these parasitics determine filter performance. Usually, in order to reduce couplings...
Published: 9/3/2012   |   Inventor(s): Shuo Wang, Fred Lee, Willem Odendaal
Keywords(s): Microelectronics
Category(s): Electrical