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Output voltage doubling circuit of flyback-forward converter

A voltage doubling circuit and converter technology, which is applied in the direction of DC power input conversion to DC power output, output power conversion devices, instruments, etc., can solve the problem of excessive output ripple of the converter, reduce ripple, reduce Withstand voltage and capacitance requirements, which is conducive to the effect of productization

Active Publication Date: 2021-03-12
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 an output voltage doubler circuit of a forward and flyback converter, which can effectively solve the problem that the output ripple of the converter is too large

Method used

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  • Output voltage doubling circuit of flyback-forward converter
  • Output voltage doubling circuit of flyback-forward converter
  • Output voltage doubling circuit of flyback-forward converter

Examples

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no. 1 example

[0031] Such as figure 2 As shown, it is the first embodiment of the present invention. The forward and flyback converter includes a primary circuit, a transformer T1 and an output voltage doubler circuit; the output voltage doubler circuit specifically includes a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and Capacitor C3; terminal 1 of the primary winding of transformer T1 and terminal 3 of the secondary winding of transformer T1 are terminals with the same name, the input voltage is connected to terminal 1 of transformer T1, terminal 2 of transformer T1 is connected to the drain of switching tube TR1 Connection, the source of the switching tube TR1 is negatively connected to the input voltage, the 4 terminals of the transformer T1 are connected to one end of the capacitor C2, the anode of the diode D1 and one end of the capacitor C3, the other end of the capacitor C2 is connected to the anode of the diode D2 and the ground GND, the diode The cathode of...

no. 2 example

[0042] Such as image 3 Shown is the second embodiment of the present invention. Compared with the first embodiment, the difference is that the capacitor C2 is reduced, and the capacitor C4 is connected between the output port Vo and the ground GND.

[0043] The working principle of this embodiment is similar to that of the first embodiment, except that the forward power supply circuit ① and the flyback power supply circuit ② are reduced. The product must be in a working cycle, only when the transformer is in the flyback working state can the transformer supply energy to the output terminal. This embodiment has application advantages in applications where the ripple requirement at the output terminal is relatively less stringent and the forward energy is required to be as small as possible.

no. 3 example

[0045] Such as Figure 4 As shown, it is the third embodiment of the present invention. Compared with the first embodiment, the difference of this embodiment is that a capacitor C4 is added, one end of the capacitor C4 is connected to the output port Vo, and the other end of the capacitor C4 is connected to the ground GND .

[0046] The working principle of this embodiment is similar to that of the first embodiment, and will not be repeated here.

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PUM

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Abstract

The invention discloses an output voltage doubling circuit of a flyback-forward converter. The output voltage doubling circuit is applied to a switching power supply product with low voltage input andhigh voltage output. The output voltage-multiplying circuit multiplies the voltage of the transformer winding and then supplies the voltage to the output end, the number of turns of the transformer winding can be effectively reduced, and the design difficulty of the transformer is reduced. The capacitor C3 serves as an energy storage device bridged between the winding port and the output port ofthe transformer, and when the converter is in a flyback working process, a loop connected with the transformer and the output port is formed, so that the transformer can supply energy to the output port in a flyback working state, and the ripple voltage of the output end is effectively reduced.

Description

technical field [0001] The invention relates to the field of forward and flyback converters, in particular to an output voltage doubler circuit. Background technique [0002] At present, DCDC high-voltage products are used in many fields, and the basic flyback topology is generally used, and the output adopts a multi-winding voltage doubler rectification scheme. The purpose of increasing the output voltage is achieved by connecting multiple windings in series, but the above method has certain limitations. [0003] Using multi-winding rectification and then series boosting, the higher the output voltage, the more windings the transformer needs. For transformer design, it is difficult to make the volume smaller. At the same time, the higher the output voltage is, the larger the voltage difference between the transformer windings will be, and the withstand voltage problem of the transformer will become more prominent, which will increase the difficulty of the selection and de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523Y02B70/10
Inventor 金亮郑满鹏冯刚
Owner MORNSUN GUANGZHOU SCI & TECH