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Forward-flyback switching power supply circuit

A switching power supply circuit, flyback technology, applied in the direction of high-efficiency power electronic conversion, electrical components, adjusting electrical variables, etc., can solve the problems of low output voltage, increased loss of primary switching tubes, etc., achieve simple circuit, and suppress current mutation , Reduce the effect of current stress and transient voltage stress

Active Publication Date: 2020-04-10
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of this, the technical problem to be solved in the present invention is to propose a forward and flyback switching power supply circuit to solve the problem of sharp increase in the loss of the primary winding and the primary switching tube when the output voltage is low or the output is short-circuited.

Method used

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  • Forward-flyback switching power supply circuit
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  • Forward-flyback switching power supply circuit

Examples

Experimental program
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Effect test

no. 1 example

[0038] figure 2 It shows the principle diagram of the first embodiment of the forward and flyback switching power supply circuit of the present invention, including the primary side circuit, the transformer T1 and the secondary side circuit, the primary side circuit includes the switching tube Q1, and the drain of the switching tube Q1 is connected to the 2 terminals of the transformer T1 terminal, the source of the switch tube Q1 is grounded; the secondary circuit includes diode D1, diode D2, diode D3, capacitor C1, capacitor C2, capacitor C3, and inductor L2; terminal 1 and terminal 3 of the transformer T1 are terminals with the same name, and the transformer T1 The 4 ends of the diode D1 are connected to the anode of the diode D1 and one end of the capacitor C2, the other end of the capacitor C2 is connected to the anode of the diode D2 and the other end of the capacitor C3, the cathode of the diode D2 is connected to the 3 ends of the transformer T1 and one end of the indu...

no. 2 example

[0043] image 3 It shows the schematic diagram of the second embodiment of the forward and flyback switching power supply circuit of the present invention. The difference from the first embodiment is that the series position of the inductance L2 of the second embodiment is changed to between the diode D1 and the capacitor C1, and the position of the inductance L2 One end is connected to the cathode of the diode D1, and the other end of the inductor L2 is connected to one end of the capacitor C1.

[0044] The working principle of this embodiment is the same as that of the first embodiment, and will not be repeated here.

no. 3 example

[0046] Figure 4 It shows the schematic diagram of the third embodiment of the forward and flyback switching power supply circuit of the present invention. The difference from the first embodiment is that the series position of the inductance L2 of the third embodiment is changed to between the diode D2 and the capacitor C2, and the position of the inductance L2 One end is connected to the other end of the capacitor C2, and the other end of the inductor L2 is connected to the anode of the diode D2.

[0047] The working principle of this embodiment is the same as that of the first embodiment, and will not be repeated here.

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Abstract

The invention discloses a forward-flyback switching power supply circuit. The circuit comprises a primary side circuit, a transformer T1 and a secondary side circuit, the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3; the end 4 of the transformer T1 is electrically connected with one end of the capacitor C2 and the anode of the diode D1; the other end of the capacitor C2 is electrically connected with the anode of the diode D2 and the other end of the capacitor C3; the cathode of the diode D2 is electrically connected with the end 3 of the transformer T1 and the other end of the capacitor C1; and the cathode of the diode D1 is electrically connected with one end of the capacitor C1 and the anode of the diode D3, and the cathode of the diode D3 is electrically connected with one end of the capacitor C3; the secondary side circuit is characterized in that the secondary side circuit further comprises an inductor L2,one end of the inductor L2 is connected with the end 3 of the transformer T1, and the other end of the inductor L2 is connected with the other end of the capacitor C1. As a transient current suppression device, the inductor can effectively reduce the peak current and short-circuit power consumption of the secondary side of the transformer and can improve the output efficiency when the output is short-circuited or the output voltage is relatively low.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a forward and flyback switching power supply circuit. Background technique [0002] Nowadays, high-voltage constant-current charging converters are used in many fields. Generally, the basic topology of flyback is used in the field of outputting high-voltage and low-power. The purpose of high output voltage, but the above methods have certain limitations. [0003] The method of multi-winding rectification and then serial output is equivalent to multiple flyback outputs in series. The higher the output voltage, the more windings are required. It is a challenge for the volume of the transformer. In addition, the distance between the pins of the transformer needs to be further increased. Large, so the size of the entire transformer will be larger; [0004] The method of voltage doubling with capacitors and diodes is only suitable for applications with small currents, and it ...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/335H02M1/0048Y02B70/10
Inventor 张彦斌刘晓旭冯刚
Owner MORNSUN GUANGZHOU SCI & TECH
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