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Flyback voltage converter having self-driving synchronous rectifier

A synchronous rectifier and flyback voltage technology, which can be applied to conversion equipment that can be converted to DC without intermediate conversion, conversion devices that convert AC power input to AC power output, and output power, etc., which can solve the problem of increasing circuit complexity and cost. , Diode rectifier conduction loss and other issues

Inactive Publication Date: 2009-02-04
GLACIALTECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The disadvantage of this kind of flyback voltage converter is that the diode rectifier will cause serious conduction loss (conduction loss)
This type of design increases the complexity and cost of the circuit due to the use of an integrated circuit controller IC

Method used

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  • Flyback voltage converter having self-driving synchronous rectifier
  • Flyback voltage converter having self-driving synchronous rectifier
  • Flyback voltage converter having self-driving synchronous rectifier

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Embodiment Construction

[0028] The preferred embodiments of the present invention are described in detail in the following embodiments and accompanying drawings.

[0029] Please refer to Figure 4 , the figure shows a flyback transformer (flybacktransformer) 100 circuit according to an embodiment of the present invention, which includes a primary winding (primary winding) L p , secondary driving winding (secondary driving winding) L d And secondary power winding (secondary powerwinding) L 1 , where the primary coil L p Used to connect the external power supply Vi.

[0030] Secondary drive coil L d and secondary power coil L1 Connect the driving circuit and the power circuit respectively. The output of the power supply circuit contains the voltage output terminal V 0 (high voltage terminal) and ground terminal (low voltage terminal) to provide the voltage of the external load circuit (load) (not shown in the figure), at the voltage output terminal V 0 A load capacitor (load capacitor) C is conn...

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Abstract

Disclosed is a flyback converter with a self-driving synchronous rectifier, which utilizes a transistor as a secondary rectifier to replace the traditional diode rectifier so as to reduce the conduction loss. However, the transistor must be driven by a proper gate driver, and traditionally, a complex and expensive non-self-driving gate driver is adopted to drive the transistor by an integrated circuit, and generally a circuit of a self-driving gate driver is still too complex. The flyback converter with the self-driving synchronous rectifier adopts a secondary drive coil to connect a diode and a switch in series for forming a drive circuit which serves as the self-driving gate driver, thereby effectively simplifying the circuit complexity and reducing costs.

Description

technical field [0001] The present invention relates to a flyback voltage converter, and more particularly to a flyback voltage converter having a self-driven synchronous rectifier. Background technique [0002] A traditional flyback converter mainly uses a transformer and a diode as a rectifier, also known as a diode rectifier, to transmit energy from a power supply to an external load circuit. The transformer circuit has a separate primary winding and a secondary winding, wherein the primary winding is used to connect to an external power supply, and the secondary winding is an induction coil for inducing changes in the magnetic flux of the primary winding. And generate induced voltage, connect rectifier (rectifier) ​​to form power circuit (power circuit), to drive external load circuit (load). [0003] Please refer to figure 1 , which shows the circuit of a conventional flyback voltage converter. Transformer 10 has primary coils L separated from each other p and the s...

Claims

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Application Information

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IPC IPC(8): H02M5/10H02M5/275
Inventor 王志良余金生
Owner GLACIALTECH
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