SWITCHING CONTROL CIRCUIT WITH VARIABLE SWITCHING FREQUENCY FOR PRIMARY-SIDE-CONTROLLED POWER CONVERTERS - Patent 1943717

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EP 1 943 717 A1

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(43)	Date of publication:
	16.07.2008 Bulletin 2008/29

(21)	Application number: 05795420.8

(22)	Date of filing: 09.10.2005

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International Patent Classification (IPC):

H02M 3/22^(2006.01)

(86)	International application number:
	PCT/CN2005/001654

(87)	International publication number:
	WO 2007/041896 (19.04.2007 Gazette 2007/16)

(84)	Designated Contracting States:
	DE NL

(71)	Applicant: System General Corp.
	Taipei Hsien 231 (TW)

(72)	Inventors:
	YANG, Ta-yung Taiwan 330 (CN) HUNG, Guo-kiang Taiwan 231 (CN) LIN, Jenn-yu G. Taiwan 231 (CN) TSAO, Fengcheng Taiwan 927 (CN) CHIU, Shao-wei Taiwan 907 (CN)

(74)	Representative: Johnson, Terence Leslie
	Marks & Clerk 90 Long Acre London, WC2E 9RA London, WC2E 9RA (GB)

(54)	SWITCHING CONTROL CIRCUIT WITH VARIABLE SWITCHING FREQUENCY FOR PRIMARY-SIDE-CONTROLLED POWER CONVERTERS