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Synchronous rectification control circuit, control method, and switching circuit

A control circuit and synchronous rectification technology, which is applied in the direction of high-efficiency power electronic conversion, electrical components, DC power input conversion to DC power output, etc., can solve the problem of increased conduction resistance, increased conduction loss, and drive signal reduction and other issues

Active Publication Date: 2019-05-03
西安矽力杰半导体技术有限公司
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Problems solved by technology

[0007] The prior art adjusts the drive signal by controlling the drain-source voltage of the synchronous rectifier to maintain a fixed value for a period of time before it is turned off, so as to achieve fast turn-off, but the drive signal decreases during this time period, so that the conduction of the synchronous rectifier The on-resistance becomes larger, which increases the conduction loss

Method used

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  • Synchronous rectification control circuit, control method, and switching circuit
  • Synchronous rectification control circuit, control method, and switching circuit
  • Synchronous rectification control circuit, control method, and switching circuit

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[0059] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0060] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0061] Figure 5 A schematic diagram of the switching circuit of the embodiment of the present invention is given, such as Figure 5 As stated above, the present invention takes the flyback circuit as an example for illustration. The flyback circuit includes a main power tube S1, a main po...

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Abstract

A synchronous rectification control circuit, a control method, and a switching circuit are disclosed. Before a synchronous rectification tube is turned off, when drain-source voltage of a synchronousrectification switch is greater than an adjustment threshold, an adjustment state is enabled to adjust amplitude of a drive signal and make the amplitude drop to a preset threshold while a short adjustment time is maintained. The drive signal is used for controlling a working state of the synchronous rectification tube, thereby achieving rapid turn-off, and at the same time, conduction loss of thesynchronous rectification tube is reduced.

Description

technical field [0001] The invention relates to the field of power electronic conversion, and more specifically, to a synchronous rectification control circuit, a control method and a switch circuit. Background technique [0002] Synchronous rectification is a method of replacing rectifier diodes with power MOSFETs with low on-state resistance to reduce rectification losses. The power MOSFET is a voltage-controlled device, and its volt-ampere characteristic is linear when it is turned on. When using a power MOSFET for rectification, the gate voltage must be synchronized with the phase of the rectified voltage to complete the rectification function. [0003] According to the working mode, switching power supply can be divided into discontinuous current mode (DCM) and continuous current mode (CCM). Synchronous rectification applications work differently in different operating modes. Take the flyback circuit as an example to illustrate. figure 1 It is a schematic diagram of...

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Application Information

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IPC IPC(8): H02M7/217
CPCH02M3/33592Y02B70/10H02M3/1588H02M3/158
Inventor 李新磊
Owner 西安矽力杰半导体技术有限公司
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