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Synchronous rectification control circuit and synchronous rectification control method

A technology of synchronous rectification and control circuit, which is applied in the direction of converting AC power input to DC power output, DC power input to DC power output, irreversible AC power input to DC power output, etc., which can solve the problem of high cost and control circuit Complicated design and other issues, to achieve the effect of low cost, high-precision control, and simple control circuit

Active Publication Date: 2013-12-25
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Controlling the synchronous rectifier based on the DS terminal voltage of the synchronous rectifier requires accurate sampling of the DS terminal voltage. Generally, a compensation circuit is required to offset the influence of parasitic parameters, and a high-speed comparator is required to achieve efficient control. The design of the control circuit is complex. , high cost

Method used

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  • Synchronous rectification control circuit and synchronous rectification control method
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  • Synchronous rectification control circuit and synchronous rectification control method

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Embodiment 1

[0032] An embodiment of the present invention provides a synchronous rectification control method, wherein, for the convenience of description, the description will be made from the perspective of a synchronous rectifier.

[0033] A synchronous rectification control method, comprising: connecting a current transformer CT in series to a secondary side, the CT samples the current of the secondary side to obtain a current detection signal, and outputs the current detection signal to a bridge rectifier; the bridge rectifier receives the current detection signal Signal, get the sampling current of the secondary side, and output the sampling current of the secondary side to the comparator, the comparator receives the sampling current of the secondary side, so that the comparator generates a voltage difference, prompting the output signal of the comparator to invert to control the switch of the synchronous rectifier.

[0034] see figure 1 , the specific control method flow can be as ...

Embodiment 2

[0055] In order to better implement the above solution, this embodiment also provides a synchronous rectification control circuit, which may specifically include a current transformer (CT, current transformer) 201, a bridge rectifier 202 and a comparator 203, specifically can refer to figure 2 , figure 2 It is the structural diagram of the synchronous rectification control circuit:

[0056] Among them, the current transformer 201 is used to connect the secondary side in series, sample the loop current of the secondary side, obtain the current detection signal, and output the obtained current detection signal to the bridge rectifier 202;

[0057] The bridge rectifier 202 is used to receive the current detection signal output by the current transformer 201, and obtain the secondary side sampling current according to the current detection signal, and output the secondary side sampling current to the comparator 203 so that the comparator 203 generates a voltage difference;

[...

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PUM

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Abstract

The embodiment of the invention discloses a synchronous rectification control circuit and a synchronous rectification control method. The synchronous rectification control circuit comprises a current transformer (CT), a bridge rectifier and a comparator, wherein the CT is in series connection with a secondary side and is used for sampling the loop current of the secondary side to obtain a current detection signal and outputting the obtained current detection signal into the bridge rectifier; the bridge rectifier is used for acquiring secondary side sampling current according to the current detection signal and outputting the secondary side sampling current into the comparator so that the comparator can generate voltage difference; the outputting signal of the comparator overturns to control the on-off of a synchronous rectifier tube. The synchronous rectification control circuit and the synchronous rectification control method can realize high-speed and high-accuracy synchronous rectifier tube control and are simple in control and low in cost.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a synchronous rectification control circuit and a synchronous rectification control method. Background technique [0002] At present, synchronous rectification technology is widely used in various high-efficiency power supplies, and it is very important for improving power supply efficiency and reducing heat loss. However, the control of the synchronous rectification circuit is relatively complicated, and it is easy to bring reliability risks while obtaining high efficiency. [0003] In the prior art, the synchronous rectifier is mainly controlled based on the timing sequence of the primary switching tube, and the synchronous rectifying tube is controlled based on the timing sequence of the primary switching tube. The processor performs processing and the drive signal is transmitted to the secondary side, requiring a corresponding isolation circuit, which is complex in design and expe...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M1/00
CPCH02M1/08H02M3/33592H02M7/217Y02B70/10H02M1/0009H02M7/00H02M3/33546H02M7/06
Inventor 陈文彬刘杰
Owner HUAWEI DIGITAL POWER TECH CO LTD