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Self-driven synchronous rectification circuit capable of limiting amplitude and current

A synchronous rectification and self-driving technology, applied in the power supply field, can solve the problem of not meeting the design requirements of the power supply module, and achieve the effect of saving design, ensuring reliability and improving reliability.

Pending Publication Date: 2020-07-31
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the input voltage of the power system becomes wider and wider, this traditional secondary-side synchronous rectification circuit cannot meet the design requirements of the power module.

Method used

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  • Self-driven synchronous rectification circuit capable of limiting amplitude and current
  • Self-driven synchronous rectification circuit capable of limiting amplitude and current

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Embodiment Construction

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0019] Such as figure 1 As shown, the self-driven synchronous rectification circuit capable of clipping and current limiting described in this embodiment includes a voltage doubler power supply unit, a driving voltage clipping unit, a driving pull-up unit, and a driving pull-down unit.

[0020] Wherein, the voltage doubler power supply unit is used to collect the voltage on the auxiliary source winding for voltage doubler power supply;

[0021] The driving voltage limiting unit is used to limit and control the driving voltage of the secondary synch...

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PUM

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Abstract

The invention discloses a self-driven synchronous rectification circuit capable of limiting amplitude and current. The self-driven synchronous rectification circuit comprises a voltage doubling powersupply unit, a driving voltage amplitude limiting unit, a driving pull-up unit and a driving pull-down unit, the voltage doubling power supply unit is used for collecting voltage on the auxiliary source winding to carry out voltage-doubling power supply; the driving voltage amplitude limiting unit is used for carrying out amplitude limiting control on the driving voltage of the secondary synchronous rectifier tube; the driving pull-up unit is used for pulling a driving signal of the secondary synchronous rectifier tube to a high level, so that the secondary synchronous rectifier tube is conducted; and the driving pull-down unit is used for pulling a driving signal of the secondary synchronous rectifier tube to a low level so as to turn off the secondary synchronous rectifier tube. The whole circuit is simple in principle and structure, low in power consumption and high in reliability, voltage-multiplying power is supplied to the driving voltage amplitude limiting circuit through the auxiliary winding of the transformer, the two switching tubes are alternately switched on to generate a driving signal, and switching-on and switching-off of the secondary synchronous rectification switching tube are controlled.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a self-driven synchronous rectification circuit capable of limiting amplitude and current. Background technique [0002] Switching power supply as the DC / DC converter of the secondary power supply of the system is widely used in military and civilian electronic systems such as aerospace, aviation, ships, weapons, electronics, railways, communications, medical electronics, and industrial automation equipment. In switching power supply design, the design of the secondary synchronous rectification circuit has a crucial influence on the efficiency and reliability of the power module. Usually, one end of the secondary winding of the transformer is connected to the grid of the synchronous rectifier to complete the self-driving of the synchronous rectifier. However, as the input voltage of the power system becomes wider and wider, this traditional secondary-side synchronous rect...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M7/10H02M1/32H02M1/08
CPCH02M1/08H02M1/32H02M7/10H02M7/217
Inventor 程煜吴承龙毛军张琦朱池生桂林
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC