A dual-transistor flyback topology switching power supply circuit driven by transformer leakage inductance

A switching power supply circuit, dual-tube flyback technology, applied in electrical components, output power conversion devices, etc., can solve problems such as easily damaged switching tubes, and achieve the effects of improving overall efficiency, small voltage stress, and simple structure

Inactive Publication Date: 2019-01-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the two switching tubes of the dual-tube flyback circuit are switched to the conduction state synchronously, the existing technology uses the driving transformer to complete the driving. Due to the existence of the DC blocking capacitor,

Method used

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  • A dual-transistor flyback topology switching power supply circuit driven by transformer leakage inductance
  • A dual-transistor flyback topology switching power supply circuit driven by transformer leakage inductance

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the present invention is described in further detail;

[0017] Such as figure 1 As shown, the double-transistor flyback topology switching power supply circuit driven by transformer leakage inductance of the present invention includes a drive signal input terminal, an isolated drive chip U1, a first capacitor C1, a second capacitor C2, a first resistor R1, a second Resistor R2, third resistor R3, fourth resistor R4, first field effect transistor Q1, second field effect transistor Q2, first diode D1, second diode D2, first series inductor L1, flyback transformer T1, the third diode D3, the fifth resistor R5, the drive supply voltage input terminal VDD, and the switching power supply voltage input terminal VIN;

[0018] The positive input terminal of the drive signal input is isolated from the signal input terminal of the drive chip U1, and the negative pole of the drive signal input terminal is connected to the input groun...

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PUM

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Abstract

The invention provides a dual-transistor flyback topology switching power supply circuit driven by transformer leakage inductance, which includes a drive signal input end, an isolation driving chip, afirst capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first field effect transistor, a second field effect transistor, a first diode, a second diode, a first inductor, a flyback transformer, a third diode, a fifth resistor, a driving supply voltage input terminal, and a switching power supply voltage input terminal. As that circuit of theinvention is simple, the reliability is good, the drive transformer is not need, and the leakage inductance of the flyback transformer is fully utilized, the power density of the switch power supplycan be effectively improved.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a dual-tube flyback topology switching power supply circuit driven by transformer leakage inductance. Background technique [0002] Switching power supplies are an integral part of electronic equipment. With the development of power electronics technology, switching power supply is developing in the direction of high frequency, high power density and high reliability. However, the voltage levels required in electronic products are usually different, and electrical isolation is usually required between products. Because the flyback circuit can simply add secondary windings to achieve multi-channel isolated output, in small and medium power supply occasions, it can be obtained widely used. But for the single-tube flyback converter, due to the existence of transformer leakage inductance, when the switch tube is turned off, a high voltage stress peak will be generated on the switch tube;...

Claims

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Application Information

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IPC IPC(8): H02M1/088
CPCH02M1/088
Inventor 石健将岳奥飞
Owner ZHEJIANG UNIV
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