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A switch converter

A technology for switching converters and transformers, which is applied to instruments, converting DC power input to DC power output, adjusting electrical variables, etc., can solve problems such as unfavorable productization, high production costs, and many PCB layers, and reduce freewheeling. diode, lower turns ratio, lower cost effect

Inactive Publication Date: 2018-12-11
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In traditional switching converters, no matter it is flyback or forward, if a large step-down ratio is to be achieved, the turns of the transformer are usually relatively large, so the number of turns of the primary winding is large. If a planar transformer is used, the required There are many layers of PCB, and the production cost is high, which is not conducive to productization

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0026] figure 2 It is a schematic diagram of the first embodiment of the switching converter power stage of the present invention. Among them, the voltage source Vin is the external input voltage, and the resistor R is the load of the switching power supply. The transformer of this invention includes capacitor Cr, MOS transistor Q1, MOS transistor Q2, transformer T, diode D and output capacitor Co. The dotted box in the figure is the equivalent schematic diagram of transformer T, which consists of leakage inductance Lr, excitation The inductance Lm and the ideal transformer T0 are composed. The leakage inductance Lr and the excitation inductance Lm are equivalent drawings, which appear in the figure for the convenience of description, and do not exist in the actual circuit.

[0027] The connection relationship of this embodiment is as follows:

[0028] The positive end of the voltage source Vin is respectively connected to the negative end of the capacitor Cr and the end of...

no. 2 example

[0038] Figure 5 It is one of the principle diagrams of the second embodiment of the switching converter power stage of the present invention.

[0039]On the basis of Embodiment 1, in order to increase the leakage inductance of the transformer T, an inductor L is externally connected outside the transformer T, and the connection relationship of the inductor L is one of the following four ways:

[0040] Method 1: The inductance L is connected between the negative terminal of the capacitor Cr and the terminal with the same name of the primary winding of the transformer T;

[0041] Method 2: The inductance L is connected between the source of the MOS transistor Q2 and the opposite end of the primary winding of the transformer T;

[0042] Method 3: The inductance L is connected between the same-named end of the secondary winding of the transformer T and the anode of the diode D;

[0043] Method 4: The inductor L is connected between the opposite end of the secondary winding of t...

no. 3 example

[0047] Figure 6 It is a schematic diagram of the third embodiment of the switching converter power stage of the present invention.

[0048] The positive end of the voltage source Vin is connected to the drain of the MOS transistor Q1, the source of the MOS transistor Q1 is respectively connected to the negative end of the capacitor Cr and the same name end of the primary winding of the transformer T, and the positive end of the capacitor Cr is connected to the drain of the MOS transistor Q2 The source of the MOS transistor Q2 is connected to the negative end of the voltage source Vin and the opposite end of the primary winding of the transformer T; the same end of the secondary winding of the transformer T is connected to the anode of the diode D, and the cathode of the diode D is connected to the output capacitor One end of Co is connected, the other end of the output capacitor Co is connected to the opposite end of the secondary side of the transformer T, one end of the out...

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Abstract

The invention provides a switching converter, which adopts a large leakage inductance transformer to form an active clamp forward circuit, and the ratio of the leakage inductance and the excitation inductance of the transformer T is greater than 0.05. By adopting the transformer leakage inductance as filtering inductance, in addition to saving the volume and cost of the output filter inductance, the leakage inductance of the transformer can withstand a part of the input voltage when the circuit works, which can reduce the turn ratio of the transformer and provide a basis for reducing the number of turns of the winding. If the leakage inductance of the transformer is insufficient, the leakage inductance can also be increased by means of external inductance.

Description

technical field [0001] The invention relates to a switch converter, in particular to an active clamp forward converter with large leakage inductance. Background technique [0002] In the application of isolated switching converters, a transformer is generally used to realize the isolation function. Ideally, the transformer is well coupled with no leakage inductance. But in the actual production of transformers, there will always be leakage inductance, and the existence of leakage inductance will cause voltage spikes when the converter is working. The larger the leakage inductance, the higher the spikes, and in severe cases, it will damage the MOS tube. Therefore, in order to reduce the influence of transformer leakage inductance, the smaller the leakage inductance is often required, the better. At the same time, in order to reduce the peak caused by the leakage inductance, an active clamp circuit is added to the circuit to clamp the peak to ensure the safe operation of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/32
CPCH02M3/33569H02M1/32
Inventor 王志燊
Owner MORNSUN GUANGZHOU SCI & TECH
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