Self-driven synchronous rectification power supply and switching-off method thereof

A technology of synchronous rectification and power supply, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of unfavorable circuit integration, large area of ​​optocoupler, cost increase, etc., to avoid self-excited oscillation, save cost, and facilitate installation Effect

Inactive Publication Date: 2012-05-02
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the above method, due to the addition of an optocoupler, the optocoupler occupies a large area in the circuit, and the creepage distance requirements must be met during installation, which is not conducive to the integration of the circuit and increases the cost

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  • Self-driven synchronous rectification power supply and switching-off method thereof
  • Self-driven synchronous rectification power supply and switching-off method thereof
  • Self-driven synchronous rectification power supply and switching-off method thereof

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Embodiment Construction

[0019] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. However, it should be understood that many implementation-specific decisions must be made in developing any such practical implementation in order to achieve the developer's specific goals, and that these decisions may vary from implementation to implementation . Moreover, it should also be understood that development work, while potentially complex and time-consuming, would at least be a routine undertaking for those skilled in the art having the benefit of this disclosure.

[0020] Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure closely related to the solution according to the present invention is shown in the drawings, and the relationshi...

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Abstract

The invention provides a self-driven synchronous rectification power supply and a switching-off method thereof. The self-driven synchronous rectification power supply comprises a switching-off control unit, a control value acquisition unit and a secondary control unit, wherein the switching-off control unit is configured to prolong the turning-on time of a primary master switch of a transformer in response to a switching-off signal of the power supply; the control value acquisition unit is configured to acquire a control value corresponding to a voltage-second product of the primary input voltage of the transformer in the turning-on time; and the secondary control unit is configured to detect the control value and to control the on / off of a synchronous rectifier on the secondary side of the transformer according to the control value. In the invention, the power supply can be switched off effectively to avoid self oscillation, has a small area and a simple structure, and is cost-saving and convenient to mount.

Description

technical field [0001] The invention relates to a power supply and a control method thereof, in particular to a self-driven synchronous rectification power supply and a shutdown method thereof. Background technique [0002] In the field of power supply technology, the synchronous rectification circuit of the self-driven synchronous rectification power supply uses a power metal oxide semiconductor field effect transistor (MOSFET) with extremely low on-state resistance to replace the rectifier diode, so it can greatly reduce the loss of the rectifier and improve DC / DC. The efficiency of the converter meets the needs of low voltage and high current rectification. However, this kind of power supply is prone to self-excited oscillation after shutdown, which will affect the reliability of the power supply. [0003] figure 1 It is a waveform diagram illustrating changes before and after shutdown of a conventional active clamp forward power supply. exist figure 1 In, when t=550μ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 刘旭君
Owner HUAWEI TECH CO LTD
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