Title:
ACTIVE CLAMPING FORWARD SWITCH POWER SUPPLY CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2019/001216
Kind Code:
A1
Abstract:
An active clamping forward switch power supply. On the basis of an LCL forward converter, the dotted terminal of a first primary winding (N P1) in a transformer (B) is connected to a power supply, and the dotted terminal of a second primary winding (N P2) is grounded; the first and second primary windings are in double-wire parallel winding; one end of a capacitor (C1) is connected to the non-dotted terminal of the first primary winding, while the other end is connected to the non-dotted terminal of the second primary winding; the non-dotted terminal of the first primary winding is connected to the power supply by means of a first field effect transistor (Q1), and the non-dotted terminal of the second primary winding is connected to the power supply by means of a second field effect transistor (Q2) and a clamping network (400) connected in series to a third capacitor (C3). The duty ratio of the switch power supply may be greater than 0.5, and demagnetized energy is recycled to achieve the zero-voltage turning on of a main power switch tube, thereby further reducing loss and especially increasing efficiency in a light load state.
Inventors:
WANG BAOJUN (CN)
Application Number:
PCT/CN2018/089576
Publication Date:
January 03, 2019
Filing Date:
June 01, 2018
Export Citation:
Assignee:
MORNSUN GUANGZHOU SCI & TECH (CN)
International Classes:
H02M3/335
Foreign References:
| CN107196515A | 2017-09-22 | |||
| CN106849669A | 2017-06-13 | |||
| CN101692595A | 2010-04-07 | |||
| CN106505865A | 2017-03-15 | |||
| CN201430532Y | 2010-03-24 | |||
| JPH08168244A | 1996-06-25 |
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (CN)
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