FLYBACK SWITCHING POWER SUPPLY

WIPO Patent Application WO/2018/161748

A1

A flyback switching power supply, which is based on a common three-winding absorption flyback converter: connecting a common-polarity end of a first primary winding (NP1) in a transformer (B) to a power supply, and connecting a common-polarity end of a second primary winding (NP2) to ground, ensuring that the first primary winding (NP1) and the second primary winding (NP2) are dual-wire windings; adding a capacitor (C1), an end of the capacitor (C1) being connected to an opposite-polarity end of the first primary winding (NP1), while another end is connected to an opposite-polarity end of the second primary winding (NP2), thus achieving: when a field effect transistor (Q1) is saturated and turned on, both the first primary winding (NP1) and the second primary winding (NP2) are excited; when the field effect transistor (Q1) is turned off, a secondary winding (NS) outputs energy, and energy from leakage inductance is non-destructively absorbed by the second primary winding (NP2) by means of a diode (D1); the present invention is suitable for operation at low voltages, and improves the utilization rate and current density of primary windings, and thus power density is high, allowing for a large leakage inductance between primary and secondary sides, while conversion efficiency is high.

WANG BAOJUN (CN)

PCT/CN2018/074968

September 13, 2018

February 01, 2018

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MORNSUN GUANGZHOU SCIENCE & TECH LTD (CN)

H02M3/335

CN106655791A	2017-05-10
US5844787A	1998-12-01
US4365171A	1982-12-21
CN102111075A	2011-06-29
CN103078514A	2013-05-01
US4268898A	1981-05-19

GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (CN)

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