Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Reexamination Certificate
2006-12-04
2009-06-30
Patel, Rajnikant B (Department: 2838)
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
C363S021120, C307S051000
Reexamination Certificate
active
07554825
ABSTRACT:
The invention discloses a switching power supply capable of reducing a low-frequency secondary-side common-mode voltage. The power supply mainly has two common-mode filtering circuit devices to prevent an AC voltage and an AC current from coupling to a secondary side of a transformer. Thus, the electrical safety and the quality in use of the associated electronic apparatus can be enhanced, a potential difference between the electronic apparatus and the ground may be greatly reduced, and an AC hum of a speaker coupled to an output of the power supply may be reduced or even eliminated.
REFERENCES:
patent: 6867575 (2005-03-01), Jacob D'Cunha
Chen Chun-Teh
Chuang Yuan-Cheng
Lin Ying-Chieh
Shieh Jenn-Jong
Bayshore Patent Group, LLC.
Huang Grace Lee
Jentec Technology Co., Ltd.
Patel Rajnikant B
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