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Synchronous rectification method and circuit capable of reducing stress of primary power device at conduction moment

A power device, synchronous rectification technology, applied in output power conversion devices, conversion of DC power input to DC power output, high-efficiency power electronic conversion, etc., can solve problems such as increasing system complexity, improve system efficiency, and reduce losses. Effect

Pending Publication Date: 2022-04-12
NANJING MICRO ONE ELECTRONICS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] For the above figure 1 and image 3 The technology shown in , usually requires an additional 600V high-voltage device and half-bridge drive circuit, which greatly increases the complexity of the system

Method used

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  • Synchronous rectification method and circuit capable of reducing stress of primary power device at conduction moment
  • Synchronous rectification method and circuit capable of reducing stress of primary power device at conduction moment
  • Synchronous rectification method and circuit capable of reducing stress of primary power device at conduction moment

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Embodiment Construction

[0040] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0041] see Figure 4-Figure 15 , the present invention provides a technical solution: a synchronous rectification method that can reduce the stress at the turn-on moment of the primary side power device, such as Figure 4 As shown, the waveform of the synchronous rectification of the present invention is shown when it works stably. The waveform shows the drain-source voltage Vds_S of the first synchronous rectifier and the drain-source voltage Vds_P of the power tube on the primary side of the transformer in one cycle, representing the first synchronous rectifier. The gate drive signal VG_SR1 represents the gate drive signal VG_SR2 of the second synchronous rectifier and represents the current Is flowing through the secondary side of the transform...

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Abstract

The invention relates to the technical field of power electronics, and discloses a synchronous rectification method capable of reducing the stress of a primary side power device at the conduction moment, which comprises the following steps: S1, detecting the time interval of opening a first synchronous rectification tube in continuous N periods (N is a positive integer greater than 1), and when the opening time interval of continuous M cycles (M is a positive integer greater than 1 and less than N) is maintained approximately constant, entering an adjustment stage. Aiming at the characteristic of large open-type stress of a flyback primary side device, a certain degree of negative current is generated through turn-off control of synchronous rectification to help the primary side device to reduce the stress at the starting moment, the system efficiency of the prior art is effectively improved, and the loss of the prior art is reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a synchronous rectification method and a circuit capable of reducing the stress at the turn-on moment of a primary power device. Background technique [0002] In the flyback conversion system, when the primary side power device is turned on, the drain-source voltage difference of the power device is usually large, often hundreds of volts, and the loss at the moment of turn-on is relatively large, which will not only affect the efficiency of the system, It will also pose challenges to the stress reliability of the device. [0003] Such as figure 1 As shown in Fig. 1, the active clamping structure with dual-transistor conduction on the primary side can be used to realize the zero-voltage turn-on of the primary side. figure 2 The working waveform of the traditional flyback converter is given, where Vds_P and Vds_S represent the drain-source voltage of the power device o...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/08
CPCY02B70/10
Inventor 鲁扬黄桦陈远平
Owner NANJING MICRO ONE ELECTRONICS
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