Title:
AN ISOLATING SELF-OSCILLATION FLYBACK CONVERTER
Document Type and Number:
WIPO Patent Application WO/2008/028407
Kind Code:
A1
Abstract:
An isolating self-oscillation flyback converter includes a coupling transformer (T1),
a FET (TR1), a transistor (TR2), a photoelectric coupling isolator (OC1) and
a load feedback circuit (Adj). The homonymous end of a feedback winding (Nfb) of
the coupling transformer (T1) is connected to the gate of the FET (TR1) via a capacitor
(C1) and a resistor (R2), and connected to the base of the transistor (TR2) via
a capacitor (C2). The base of the transistor (TR2) is also connected to the emitter
of the photoelectric coupling isolator (OC1). The photoelectric coupling isolator
(OC1) is connected to the positive terminal of the output voltage. The enharmonic
end of the feedback winding (Nfb) is connected to the collector of the photoelectric
coupling isolator (OC1) via a resistor (R5), and connected to ground via a capacitor
(C5). The homonymous end of the feedback winding (Nfb) is also connected to the
cathode of a diode (D), and the anode of the diode (D) is connected to ground. A group
of windings are reduced by forming a loop circuit directly between the feedback
winding (Nfb) and the photoelectric coupling isolator (OC1).
Inventors:
HUANG, Jiangjian (8/F Bldg. 6, Huangzhou Industry Park Chebei Rd.,Tianhe District,Guangzhou, Guangdong 0, 510660, CN)
黄江剑 (中国广东省广州市天河区车陂路黄洲工业区6栋2楼, Guangdong 0, 510660, CN)
黄江剑 (中国广东省广州市天河区车陂路黄洲工业区6栋2楼, Guangdong 0, 510660, CN)
Application Number:
CN2007/002572
Publication Date:
March 13, 2008
Filing Date:
August 27, 2007
Export Citation:
Assignee:
MORNSUN GUANGZHOU SCIENCE & TECHNOLOGY LTD. (8/F Bldg. 6, Huangzhou Industry Park Chebei Rd.,Tianhe District,Guangzhou, Guangdong 0, 510660, CN)
广州金升阳科技有限公司 (中国广东省广州市天河区车陂路黄洲工业区6栋2楼, Guangdong 0, 510660, CN)
HUANG, Jiangjian (8/F Bldg. 6, Huangzhou Industry Park Chebei Rd.,Tianhe District,Guangzhou, Guangdong 0, 510660, CN)
广州金升阳科技有限公司 (中国广东省广州市天河区车陂路黄洲工业区6栋2楼, Guangdong 0, 510660, CN)
HUANG, Jiangjian (8/F Bldg. 6, Huangzhou Industry Park Chebei Rd.,Tianhe District,Guangzhou, Guangdong 0, 510660, CN)
International Classes:
H02M3/335; H02M3/24
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (3F Building No.60, Room 301100 XianLie Zhong Road,Guangzhou, Guangdong 0, 510070, CN)
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