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An active clamp flyback converter and its realization method

A flyback converter and clamping technology, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., can solve problems such as inability to accurately judge load conversion, increase losses, and increase device and circuit costs. Achieve the effect of frequency reduction with reasonable conditions, eliminate the hidden danger of false shutdown, and solve the effect of current drop

Active Publication Date: 2022-05-17
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this circuit structure, the initial phase of resonance is greater than 90°, which can effectively solve the problem of false shutdown of synchronous rectifiers, but increases the cost of devices and circuits, and also increases losses
[0012] In addition, for the optimization of the light-load efficiency of the active clamp flyback resonant converter, in the prior art, the load condition is generally judged according to the error amplification signal output by the error amplifier to realize frequency reduction control or hiccup control, and the error amplification The signal is affected by both input voltage and load fluctuations, and the load change cannot be accurately judged

Method used

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  • An active clamp flyback converter and its realization method
  • An active clamp flyback converter and its realization method
  • An active clamp flyback converter and its realization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] see Image 6 , the active clamp flyback resonant converter comprises:

[0047] Primary side main switch Q 1 , Resonant inductance L r and transformer T primary winding W p The input port formed by receiving the input DC voltage; the main switch Q of the primary side 1 The drain of the DC input voltage source is connected to the positive terminal, and the main switch Q of the primary side is 1 The source is connected to the resonant inductance L r At one end, the resonant inductance L r The other end of the transformer T primary winding W p The terminal of the same name, the primary winding W of the transformer T p The opposite terminal of the DC input voltage source is connected to the negative terminal of the DC input voltage source, and the main switch Q of the primary side is 1 The gate receives the drive signal V G1 ; The transformer model shown in the figure also includes the magnetizing inductance L of the transformer T m .

[0048] Secondary side recti...

Embodiment 2

[0071] see Figure 8 , the active clamp flyback resonant circuit includes: the primary main switch Q 1 , resonant inductance L r and transformer T primary winding W p The formed input port receives the input DC voltage; the resonant inductance L r One end is connected to the positive end of the DC input voltage source, the resonant inductor L r The other end of the transformer T is connected to the primary winding W p The namesake end of the transformer T, the primary winding W p The synonymous termination of the primary side main switch Q 1 the drain of the primary main switch Q 1 The source is connected to the sampling resistor R s one end of the sampling resistor R s The other end is connected to the negative end of the DC input voltage source and the reference ground, the primary side main switch Q 1 The gate receives the drive signal V G1 .

[0072] Secondary rectifier Q 3 and the output capacitor C o constitute the output circuit, with the secondary winding ...

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Abstract

The invention discloses an active clamp flyback converter and its realization method, in which the primary side main switch Q 1 , via the resonant inductance L r connected in series with the primary winding of the transformer; the main switch Q on the primary side 1 During the conduction period, the DC input voltage passes through the resonant inductor L r Added to the primary side winding of the transformer, the transformer stores energy; in the primary side main switch Q 1 During the shutdown period, the DC input voltage is disconnected from the primary winding of the transformer, and the main switch Q of the transformer on the primary side 1 The energy stored during the conduction period is released to the load through the secondary winding of the transformer. The invention turns off the auxiliary switching tube according to the detected zero-crossing point of the current of the rectifier tube on the secondary side, and performs self-adaptive frequency reduction according to the obtained load current value, realizes the efficiency optimization of the converter in the full load range, and can also solve the problem of the primary side resonant active clamp The current drop problem of the secondary rectifier tube of the flyback converter.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and relates to an active clamp flyback converter and a realization method thereof. Background technique [0002] With the rapid development of the application of power electronics technology, people have higher and higher requirements for the small size, high efficiency and high reliability of switching converters. Flyback converters are widely used in low-power switching power supplies due to their simple topology and fewer components. The loss is large, and it is not suitable for low voltage and high current applications. [0003] The active clamp flyback converter can realize zero-voltage turn-on (ZVS), and the electricity in its parasitic capacitance is drawn away through the current, and the voltage at both ends of the switch tube drops to zero before the switch tube is turned on, thereby greatly reducing the primary side switch. reduce tube loss and improve efficiency. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/08
CPCH02M3/33592H02M1/083Y02B70/10
Inventor 谢小高程之杰董汉菁李京蔚
Owner HANGZHOU DIANZI UNIV