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Synchronous rectification power supply circuit with absorption function

A technology of synchronous rectification and power supply circuit, which is used in high-efficiency power electronic conversion, output power conversion device, conversion of DC power input to DC power output, etc. Increase the difficulty of winding the main transformer and other issues to achieve the effects of reducing leakage inductance oscillation, reducing fixed loss, and reducing standby power consumption

Active Publication Date: 2018-11-27
大山科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The auxiliary winding increases the winding difficulty of the main transformer, and at the same time increases the leakage inductance of the main transformer, which in turn increases the high-frequency peak voltage

Method used

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  • Synchronous rectification power supply circuit with absorption function
  • Synchronous rectification power supply circuit with absorption function
  • Synchronous rectification power supply circuit with absorption function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] like figure 2 As shown, this embodiment provides a synchronous rectification power supply circuit with absorption function, including a first diode D1, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a MOS transistor Q2;

[0024] The power supply pin of the synchronous rectification controller is connected to the opposite end of the secondary winding of the main transformer T1 through the second capacitor C2, the output pin of the synchronous rectification controller is connected to the gate of the MOS transistor Q2, and the grounding of the synchronous rectification controller is The pins are respectively connected to the source of the MOS transistor Q2, the other end of the second capacitor C2, and the opposite end of the secondary winding of the main transformer T1; one end of the first capacitor C1 is connected to the main transformer T1 after passing through the first diode D1 The opposite end of the secondary winding is connected; the juncti...

Embodiment 2

[0029] like figure 2 As shown, this embodiment provides a synchronous rectification power supply circuit with absorption function, including a first diode D1, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a MOS transistor Q2;

[0030] The power supply pin of the synchronous rectification controller is connected to the opposite end of the secondary winding of the main transformer T1 through the second capacitor C2, the output pin of the synchronous rectification controller is connected to the gate of the MOS transistor Q2, and the grounding of the synchronous rectification controller is The pins are respectively connected to the source of the MOS transistor Q2, the other end of the second capacitor C2, and the opposite end of the secondary winding of the main transformer T1; one end of the first capacitor C1 is connected to the main transformer T1 after passing through the first diode D1 The opposite end of the secondary winding is connected; the juncti...

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Abstract

The invention belongs to the technical field of an electronic circuit, and discloses a synchronous rectification power supply circuit with an absorption function. The synchronous rectification power supply circuit comprises a first diode, a first capacitor, a second capacitor, a third capacitor and an MOS tube, wherein a power supply lead pin of the synchronous rectification controller is connected with the synonymous end of a secondary edge winding of a main transformer through the second capacitor; the output lead pin of the synchronous rectification controller is connected with the grid electrode of the MOS tube; the grounding lead pin of the synchronous rectification controller is respectively connected with the source electrode of the MOS tube, the other end of the second capacitor and the synonymous end of the secondary edge winding of the main transformer; one end of the first capacitor is connected with the synonymous end of the secondary edge winding of the main transformer after passing through the first diode; a combining point of the first capacitor and the combination point of the cathode of the first diode is connected with the power supply lead pin of the synchronousrectification controller; the other end of the first capacitor is respectively connected with the drain electrode of the MOS tube and one end of the third capacitor; the other end of the third capacitor is grounded. The leakage inductance oscillation of the main transformer is reduced; the fixed loss of the switch power supply is reduced.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a synchronous rectification power supply circuit with absorption function. Background technique [0002] Power supply is an important part of various electronic equipment, it is like the heart of the human body, providing power for the normal operation of all electrical equipment. With the rapid development of various electronic equipment and electrical appliances, there is a great demand for high-quality power supplies with high efficiency and stable performance. Switching power supply is a kind of power supply that uses modern power electronic technology to control the time ratio of switching on and off to maintain a stable output voltage. Switching power supply is generally composed of pulse width modulation (PWM) control IC and MOSFET. With the development and innovation of power electronics technology, switching power supply technology is constantly ...

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 李太平
Owner 大山科技有限公司