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Converter with zero output ripple

A converter, ripple technology, used in output power conversion devices, instruments, DC power input conversion to DC power output and other directions

Active Publication Date: 2018-09-28
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above scheme has shortcomings. When the input voltage range is wide, the scheme has different output voltage ripples under different input voltages, and cannot achieve zero ripple in the full input voltage range.
After the above-mentioned schemes, there are many schemes that improve the winding position and circuit of the transformer winding, and improve the overall performance of the converter, but none of them can achieve zero-ripple output in the full input voltage range.

Method used

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Examples

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Effect test

no. 1 example

[0024] figure 2 It is a schematic diagram of the power stage of the first embodiment of the zero-ripple circuit of the present invention.

[0025] The transformer structure of the zero ripple circuit of the present invention is as follows:

[0026] The transformer has 4 magnetic columns, namely magnetic column 1, magnetic column 2, magnetic column 3 and magnetic column 4. The winding p is wound on the magnetic column 1 of the transformer, and the number of turns is Np; the winding s is wound on the magnetic column 1 of the transformer, and the number of turns is Ns; There is no winding on 3, the winding L is wound on the transformer magnetic column 4, and the number of turns is N L .

[0027] The connection relationship of the power stage circuit of the zero ripple circuit of the present invention is as follows:

[0028] The positive terminal of the input voltage Vin is connected to the same terminal of the winding p, the opposite terminal of the winding p is connected to...

no. 2 example

[0040] Figure 4 It is a schematic diagram of the second embodiment of the auxiliary voltage of the zero-ripple circuit of the present invention.

[0041] The connection relationship of the auxiliary voltage circuit of the zero ripple circuit of the present invention is as follows:

[0042] The gate of the switch Q1 is connected to the first input terminal of the sampling / computing circuit U2, the source of the switch Q1 is connected to the second input terminal of the sampling / computing circuit U2, and the positive terminal of the input voltage Vin is connected to the first input terminal of the sampling / computing circuit U2. The three input terminals are connected, the negative terminal of the input voltage Vin is connected to the fourth input terminal of the sampling / computing circuit U2, the positive output terminal of the sampling / computing circuit U2 is connected to the same-named terminal of the power stage winding a, and the opposite-named terminal of the winding a It...

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Abstract

The present invention provides a converter with zero output ripple. The shape of a magnetic core of a transformer is changed. A magnetic column is added on the basis of an original transformer structure. A magnetic core with three magnetic columns is changed into a magnetic core with four magnetic columns. Then, a winding is added to the added magnetic column. Proper voltage is added to the winding. A magnetic flux generated by the added voltage is used to offset the influence of an original magnetic flux on an output current ripple to realize zero output ripple. The converter with zero outputripple overcomes the defects of an existing switch converter, and can realize zero output ripple within a full input voltage range when the input voltage range is wide.

Description

technical field [0001] The invention relates to an output zero-ripple converter. Background technique [0002] In traditional switching converters, current fluctuations are often caused by voltage jumps on the output magnetic components, which will cause ripples in the output voltage. Due to the existence of ripples, it is necessary to choose a capacitor with a larger capacity so that the fluctuation of the output voltage is within an acceptable range. [0003] If the converter can achieve zero output ripple, the output capacitor can be reduced, and the ripple is reduced to zero, and the noise transmitted from the switching power supply to the load will also be reduced accordingly. Chen Qianhong proposed a magnetically integrated ACF converter in the paper "Active Clamp Forward Integrated Converter with Output Ripple Minimization", which integrates the inductor and transformer in the forward converter into one magnetic core. The input voltage and output voltage can achieve...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/14
CPCH02M1/14H02M3/33569
Inventor 王志燊钟年发郭启利
Owner MORNSUN GUANGZHOU SCI & TECH
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