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Flyback converter circuit

A converter circuit and flyback technology, applied in the direction of output power conversion devices, instruments, electrical components, etc., can solve the problems of inability to perform continuous current mode, etc., achieve small duty cycle, high efficiency, and reduce overall cost Effect

Active Publication Date: 2015-08-12
哈拉尔德·迪尔勒斯博格
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Likewise, continuous current mode cannot be performed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] figure 1 A first embodiment of a flyback converter circuit according to the invention is shown. Here, the flyback converter includes a transformer 103 , a diode 106 , a charging capacitor 107 and a semiconductor switch 120 . The flyback converter is powered by a voltage source 101 . Also connected in parallel to the voltage source 101 is another capacitor 102 having the same image 3 Same effect as described. In this embodiment, the oscillator used for startup is composed of a transformer 103 and a startup transistor 104 . The frequency (f) of the oscillator is determined corresponding to:

[0055] f = 1 2 × π × L ( sec ) × C

[0056] Wherein, C is the sum of the input capacitance of the transi...

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PUM

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Abstract

The invention relates to a flyback converter circuit comprising a transformer, a charging capacitor, a diode, a semiconductor switch and a controller, which form a flyback converter, wherein the controller is designed to control the semiconductor switch after the start of the flyback converter. The transformer has a primary winding and a secondary winding each having a winding beginning and a winding end. Furthermore, a start transistor is provided, which is coupled by its gate terminal to the winding beginning of the secondary winding of the transformer and is connected by its drain terminal to the winding end of the primary winding of the transformer, wherein an oscillator is formed at least by means of the transformer and the start transistor. Moreover, the charging capacitor supplies the controller with energy. The diode is provided between the winding beginning of the secondary winding of the transformer and the charging capacitor, wherein the anode of the diode is connected to the charging capacitor.

Description

technical field [0001] The invention relates to a flyback converter circuit. A conventional flyback converter circuit has a transformer, charging capacitors, diodes, semiconductor switches and a controller. A transformer has a primary winding and a secondary winding, each winding having a winding start and a winding end. The two windings are connected in an opposing manner. The core of the transformer has an air gap. It can also be described as a flyback transformer, dual inductor, or coupled inductor. The controller is designed to control the semiconductor switches after the flyback converter has started. Background technique [0002] A flyback converter is also described as a buck-boost converter. A flyback converter constitutes a specific form of DC / DC converter. [0003] Now, will refer to image 3 To illustrate the simple basic structure of a flyback converter. [0004] image 3 The flyback converter has a voltage source 301 , a transformer 303 , a diode 306 , a ...

Claims

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Application Information

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IPC IPC(8): H02M1/36H02M3/335H02M3/338
CPCH02M1/36H02M3/33507H02M3/3381G05F1/575H02M3/156H02M3/3353H02M1/123H02M3/33576
Inventor 哈拉尔德·迪尔勒斯博格
Owner 哈拉尔德·迪尔勒斯博格