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Quasi-resonant power supply based on NCP1337

A quasi-resonant, power supply technology, used in electrical components, output power conversion devices, etc., can solve problems such as electromagnetic interference and high instantaneous power of power tubes.

Inactive Publication Date: 2012-05-16
杨风华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional power supply design works in a fixed frequency mode, so that the power tube is turned on at high voltage, and the instantaneous power consumed by the power tube during the shutdown process is relatively large, and it will also cause certain electromagnetic interference.

Method used

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  • Quasi-resonant power supply based on NCP1337
  • Quasi-resonant power supply based on NCP1337

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Experimental program
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Embodiment Construction

[0008] The present invention uses the quasi-resonant switching power supply designed by NCP1337 to replace the traditional linear power supply. Based on the NCP1337 quasi-resonant power supply, it consists of a peak voltage absorption circuit, an input undervoltage voltage protection and overload compensation circuit, an auxiliary power supply circuit, a secondary rectification filter circuit, and an isolated voltage feedback circuit. Sampling circuit composition.

[0009] VD2, C4 and R17 form a peak voltage absorption circuit, which is mainly used to absorb the rising edge peak voltage energy generated when the MOSFET power switch tube is turned off, reduce the peak voltage amplitude, and prevent the power switch tube from overvoltage breakdown; The unique input voltage monitoring function detects the input voltage through R1, R2, R3, and C2 to realize input overvoltage and undervoltage protection. Resistor R4 is used to set the depth of overload compensation. Although NCP1337...

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Abstract

The invention provides a quasi-resonant power supply based on NCP1337 and relates to a quasi-resonant type switch power supply. The quasi-resonant power supply based on NCP1337 is stable in property and low in conducting loss. In the invention, a traditional linear power supply is replaced by the quasi-resonant type switch power supply based on NCP1337 design. The structural characteristic is that the quasi-resonant power supply based on NCP1337 is composed of a spike voltage absorbing circuit, an input under-voltage protection and overload compensating circuit, an auxiliary power supply circuit, a secondary rectifying filter circuit and an isolating voltage feedback sampling circuit.

Description

Technical field: [0001] The invention relates to a quasi-resonant switching power supply, in particular to a quasi-resonant power supply based on NCP1337. Background technique: [0002] As the global industry has higher and higher requirements for power supply efficiency, power supplies including ATX power supplies and consumer electronics products require higher energy-saving requirements. The traditional power supply design works in a fixed frequency mode, so that the power tube is turned on at high voltage, and the instantaneous power consumed by the power tube during the shutdown process is relatively large, and it will also cause certain electromagnetic interference. Invention content: [0003] The present invention aims at the above problems and provides a quasi-resonant power supply based on NCP1337 with stable performance and low conduction loss. [0004] In order to achieve the above object, the present invention adopts the following technical scheme. The present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
Inventor 杨风华
Owner 杨风华