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Self-driven synchronous rectification drive regulating circuit and switching power supply system

A technology of regulating circuit and synchronous rectification, which is applied in the direction of control/regulating system, regulating electric variable, high-efficiency power electronic conversion, etc., can solve the problems of reducing the reliability of switching power supply, etc., to improve the input voltage range and output voltage regulation range, and ensure Reliability, Stress Reduction, and Backsink Current Effects

Inactive Publication Date: 2019-12-03
SHANGHAI JUNTAO POWER EQUIP CO LTD
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Problems solved by technology

[0005] Based on this, it is necessary to limit the input voltage range and output voltage regulation range of the switching power supply and reduce the reliability of the switching power supply in view of the stress and reverse current generated by the synchronous rectifier when the switching power supply suddenly turns on when the output voltage does not drop to zero. For this problem, a self-driven synchronous rectification drive regulation circuit and switching power supply system are provided

Method used

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  • Self-driven synchronous rectification drive regulating circuit and switching power supply system
  • Self-driven synchronous rectification drive regulating circuit and switching power supply system
  • Self-driven synchronous rectification drive regulating circuit and switching power supply system

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Embodiment Construction

[0037] In order to better understand the purpose, technical solution and technical effect of the present invention, the present invention will be further explained below in conjunction with the accompanying drawings and embodiments. At the same time, it is stated that the embodiments described below are only used to explain the present invention, and are not intended to limit the present invention

[0038] An embodiment of the present invention provides a self-driven synchronous rectification drive regulation circuit.

[0039] figure 1 It is a structural diagram of a self-driven synchronous rectification drive regulation circuit module in an embodiment, such as figure 1 As shown, including module 100 and module 101:

[0040] The switch control module 100 is configured to output a first switch signal when the switch power supply is turned on, and output a second switch signal when the switch power supply is turned off;

[0041] The semiconductor switch device 101, the controll...

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Abstract

The invention relates to a self-driven synchronous rectification drive regulating circuit and a switching power supply system. According to the present invention, a switch control module outputs a second switch signal when a switching power supply is turned off, such that semiconductor switching device controls the conduction of the first switching end and the second switching end of the semiconductor switching device; and the grid electrode of a first synchronous rectifier tube and the grid electrode of a second synchronous rectifier tube are pulled down to a ground potential to rapidly reduce the grid electrode voltage of the first synchronous rectifier tube and the grid electrode voltage of the second synchronous rectifier tube, such that the stress and the reverse current generated bythe first synchronous rectifier tube and the second synchronous rectifier tube can be reduced when the switching power supply is started so as to easily improve the input voltage range and the outputvoltage regulation range of the switching power supply and ensure the reliability of the switching power supply.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a self-driven synchronous rectification drive regulation circuit and a switching power supply system. Background technique [0002] In recent years, with the continuous development of electronic technology, the operating voltage of the circuit is getting lower and lower, and the current is getting higher and higher. Low voltage operation can reduce the overall power consumption of the circuit. However, in the case of low-voltage and high-current output, the loss of the rectifier diode at the output end is particularly prominent. Fast recovery diodes or ultra-fast recovery diodes can reach 1.0-2.0V. Even if a low-drop Schottky diode is used, a voltage drop of about 0.6V will be generated, which will increase rectification losses and reduce power supply efficiency. Assuming a supply voltage of 3.3V or even 1.8V or 1.5V, the circuit consumed can reach 20A. At this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592Y02B70/10
Inventor 史献冰厉干年权玉良李华铭
Owner SHANGHAI JUNTAO POWER EQUIP CO LTD
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