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High-efficiency forward switching power supply

A switching power supply and high-efficiency technology, which is applied in the electronic field, can solve the problems of reduced working efficiency of switching power supply, low power integration, and complex circuits, and achieve the effects of reduced volume, small ripple voltage, and high output voltage

Inactive Publication Date: 2018-11-16
HENAN FUDIAN ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a forward-based high-efficiency switching power supply, which solves the problems of the existing switching power supply with complex circuits, large volume, and low power integration, which lead to reduced working efficiency of the switching power supply.

Method used

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Effect test

Embodiment 1

[0048] A forward-based high-efficiency switching power supply provided by a preferred embodiment of the present invention, such as figure 1 As shown, it includes an input rectification filter circuit, a high-frequency transformer circuit, an output rectifier filter circuit and a control circuit; the output of the input rectifier filter circuit is connected to the input of the high-frequency transformer circuit, and the output of the high-frequency transformer circuit Connected to the input of the output rectification filter circuit, the output of the output rectification filter circuit is connected to the high-frequency transformer circuit through the control circuit;

[0049] The input rectifying and filtering circuit is used to convert the input alternating current into high-frequency alternating current containing a certain pulsating voltage component;

[0050] The high-frequency transformer circuit is used to convert high-frequency alternating current into low-voltage dire...

Embodiment 2

[0063] On the basis of Example 1, as figure 2 As shown, further, the input rectification and filtering circuit includes a single-phase bridge B1, the input terminal of B1 is connected to AC alternating current, the output terminal is connected in parallel with a resistor R1 and a capacitor C1, and an external series diode D1 and resistor R2 are connected to the ground. ; The output rectification and filtering circuit includes a single-phase bridge B2, one input end of the B2 is connected to the inductor L1, and the capacitors C2 and C3 are connected in parallel between the other input end and then grounded; the diode D1 is used to complete the freewheeling process , to avoid the phenomenon that a certain thyristor is continuously turned on, which leads to runaway. At the same time, there is one less tube voltage drop in the conductive circuit during the freewheeling period, which is beneficial to reduce loss.

[0064] Furthermore, the high-frequency transformer circuit includ...

Embodiment 3

[0070] On the basis of the second embodiment, further, the control circuit further includes a protection circuit, the protection circuit is an overcurrent protection circuit, specifically, the port 3 of the U1 is connected to the field effect transistor Q1 through a resistor R7 The source is used to detect the current of Q1, wherein R7 is a voltage sampling resistor, port 6 is connected to the gate of Q1 through a resistor R6, and R5 is connected in parallel between the source and gate of Q1.

[0071] This embodiment can detect the instantaneous current flowing through the field effect transistor Q1, and when it exceeds the instantaneous current limit value, the field effect transistor will be turned off. The protection circuit has a fast response speed and can realize various instantaneous currents caused by magnetic core saturation. Protection of FETs under overcurrent conditions.

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Abstract

The invention discloses a high-frequency forward switching power supply, and belongs to the technical field of electronics. An inputted alternating current is converted into a high-frequency alternating current through an input rectification filter circuit, and the high-frequency alternating current is converted into a low-voltage direct current through a high-frequency voltage-stabilizing circuit, wherein the low-voltage direct current is filtered through an output rectification filter circuit and then outputted, thereby achieving the purpose of the conversion of the alternating current intothe direct current, reducing excessive magnetic cores, electrolytic capacitors and rectification tubes, reducing the size of the switching power supply, and improving the integration degree. Moreover,a control circuit carries out the adjustment of a direct current outputted by the high-frequency voltage-stabilizing circuit, thereby enabling the output voltage of the whole switching power supply to be more stable, improving the work efficiency of the switching power supply, and solving the problem of low work efficiency of a conventional switching power supply because of the complex circuit, larger size and low integration degree.

Description

technical field [0001] The invention belongs to the field of electronic technology and relates to a forward-based high-efficiency switching power supply. 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. Some semiconductor devices are used as switches (usually transistors or MOSFETs) to transform a power supply form. Into another form of power supply, and use automatic control to stabilize the output during conversion. Currently, it is widely used in postal communications, precision electronic devices, large-scale equipment, medical instruments, and digital home appliances. [0003] Switching power supply technology started to be researched late but developed very fast. The continuous update of materials and the continuous development of uses are the main reasons for its rapid development, but there are still some pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/217H02M1/0067
Inventor 张壮
Owner HENAN FUDIAN ELECTRONICS TECH CO LTD