Device For Reducing Noise Current In Power Adaptor
An Apparatus For Reducing Electromagnetic Interference Due To Common Mode Current In Power Converters Is Disclosed. Common Mode Current Flowing Through High Parasitic Capacitance On The Load Side Typically Contributes Significantly To The Electromagnetic Interference. In Order To Reduce The Electromagnetic Interference The Common Mode Current Is Reduced By Reducing The Voltage Driving A Current Through The High Parasitic Capacitance. A Counter-Acting Voltage Source Produces A Voltage Out Of Phase With The Voltage Driving The Common Mode Current. Such A Counter-Acting Voltage Is Obtained With The Aid Of A Winding Coupled To The Magnetic Component In The Power Converter Or By One Or More Active Components. The Counter-Acting Voltage Source Is Connected In Series With A Capacitance Element Connected Between The Input And Output Sides Of The Converter-Input Terminal And Output Terminal When Electrical Isolation Between The Input And The Output Is Desired.
Inventor: Chui-pong Joe Liu | Man-hay Bryan Pong | Ngai-kit Franki Poon
Priority Number: CN1871761B
IPC Current: H02M000328 | B29C004576 | G06F000130 | H02M000112
Assignee Applicant: The University of Hong Kong
Title: Apparatus and method for noise current reduction in power converters | Used for reduce the power converter noise current injection molding device and method
Usefulness: Apparatus and method for noise current reduction in power converters | Used for reduce the power converter noise current injection molding device and method
Summary: Used for reduction of common mode noise in a switching power converter.
Novelty: Common mode noise reduction apparatus for converter, has series impedance coupled to source so that impedance is in path through which common mode noise can flow, where impedance produces short circuit for noise with voltage
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