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Fly back switching power supply and control circuit thereof

A switching power supply and control circuit technology, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve problems such as power supply stability and low reliability, and achieve a wide range of applications, high control and driving capabilities, and circuit stable effect

Inactive Publication Date: 2018-01-12
XJ POWER CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a flyback switching power supply and its control circuit to solve the problem of low stability and reliability of the overall performance of the power supply when only the output voltage is controlled

Method used

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  • Fly back switching power supply and control circuit thereof
  • Fly back switching power supply and control circuit thereof

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Embodiment Construction

[0026] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] The flyback switching power supply of the present invention includes an input filter circuit for filtering the high voltage of the DC bus, and is composed of two series-connected MOS tubes, a transformer, an output filter circuit and a control circuit. The transformer drive controls the turn-on and turn-off of the two MOS tubes to perform transformer charging and flyback discharge. Among them, the control circuit such as figure 2 Shown.

[0028] On the whole, the control circuit is composed of a controllable precision voltage stabilizer source U5. The adjustment control module adjusts and controls the output voltage and current overload signals. The isolation of the primary side and the secondary side is achieved through the isolation optoc...

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Abstract

The invention relates to a flyback switching power supply and a control circuit thereof. The control circuit comprises a pulse modulation controller which is used for outputting the PWM to drive a switch tube to be switched on and off. The comparison port of the pulse modulation controller is connected with the output end of an adjustment control module. The adjustment control module comprises a controllable precise voltage-stabilization source. The sampling end of the controllable precise voltage-stabilization source is used for being connected with an output voltage signal. The control circuit further comprises an overload protection module. The overload protection module comprises a first comparator. The non-inverting input end of the first comparator is used for being connected with anoutput current signal, and the inverting input end of the first comparator is connected with a first reference value. The output end of the first comparator is connected with the sampling end of thecontrollable precise voltage-stabilization source. According to the invention, the output voltage is controlled according to the change of the output voltage and the change of the overload current signal, so that the reliability is high. The dynamic response speed is increased, so that the switching frequency is accurately controlled. The duty ratio is adjusted.

Description

Technical field [0001] The invention belongs to the technical field of switching power supplies, and specifically relates to a flyback switching power supply and a control circuit thereof. Background technique [0002] 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. It is generally composed of pulse width modulation control single-chip microcomputer and MOSFET. At present, switching power supplies are widely used in industrial automation control, military equipment, scientific research equipment and other fields due to their small size, light weight and high efficiency. It is an indispensable power source for the rapid development of today's electronic information industry. [0003] The introduction of isolation transformers into basic Buck, Boost, and Cuk DC / DC converters can realize electrical isolation between the input power supply of the converte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M1/32H02M3/335
Inventor 袁顺刚曹亚曹智慧常志国于越张滨王聪慧张博王继忠
Owner XJ POWER CO LTD
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