Flyback converter leakage inductor absorption and feedback circuit

A flyback converter and feedback circuit technology, applied in the direction of DC power input conversion to DC power output, instruments, electrical components, etc., can solve the problems of leakage inductance energy absorption and feedback circuit complexity, etc., to achieve simple and reliable circuit structure, eliminate Voltage spikes, the effect of improving reliability

Inactive Publication Date: 2015-10-21
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is suitable for flyback circuits in continuous, discontinuous and critical discontinuous operating modes, and solves the problems of the current critical discontinuous operating mode flyback transformer leakage inductance energy absorption and feedback circuit and its control are too complicated, and improves Reliability and Efficiency of Flyback Circuit

Method used

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  • Flyback converter leakage inductor absorption and feedback circuit
  • Flyback converter leakage inductor absorption and feedback circuit
  • Flyback converter leakage inductor absorption and feedback circuit

Examples

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention should not be limited thereby.

[0019] figure 1 It is a traditional RCD leakage inductance energy absorption feedback circuit, in which the leakage inductance energy is conducted to the C1 capacitor through the diode D2 and stored to realize the recovery of the leakage inductance energy, and then the leakage inductance energy is consumed through the resistor R2.

[0020] figure 2 It is the principle diagram of the working circuit of the present invention, in which the same-named end of the primary side of the flyback transformer T1 is connected to the input voltage, the drain of the main switching tube S1 is connected to the different-named end of the primary side of the flyback transformer T1, and the clamping capacitor C1 The negative terminal is connected to the positive terminal of the input power s...

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Abstract

The invention discloses a flyback converter leakage inductor absorption and feedback circuit, and belongs to the technical field of an integrated circuit. The circuit combines leakage inductor energy absorption and a feedback circuit together, is composed of a clamping capacitor C1 and a clamping switch tube S2, and is simple and reliable in structure and convenient to control. Compared to a conventional RCD absorption mode, the capacitor C1 only functions to absorb leakage inductor energy and release the leakage inductor energy to a main circuit when the switch tube is conducted, realizes absorption and feedback of the leakage inductor energy and effectively improves the efficiency of a flyback converter. At the same time, since the conduction time sequence of the switch tube S2 and the conduction time sequence of a switch tube S1 are the same, the requirements for the time sequence driving design of the S2 are greatly simplified, and such a control mode is also applied to flyback transformation circuits of any modes. The circuit structure provided by the invention has an advantage in a small-power flyback converter.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, in particular to a flyback transformer leakage inductance energy absorption feedback circuit. Background technique [0002] Due to the advantages of simple structure, low cost, small number of components, easy control, and support for multiple output voltages, flyback converters are widely used in low-power power supplies and low-power inverters. In recent years, in order to achieve higher efficiency and smaller size, the operating frequency of converters has been greatly improved. However, as the operating frequency continues to rise, the leakage inductance loss of the flyback transformer becomes an important bottleneck restricting the conversion efficiency of the converter. [0003] The leakage inductance energy absorption and feedback circuit of the flyback transformer is extremely necessary, it absorbs and releases the leakage inductance energy into the main power circuit, elimin...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M3/335
Inventor 戴二虎黄桃
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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