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A flyback converter and LED driver using the flyback converter

A converter and controller technology, used in output power conversion devices, instruments, and DC power input to DC power output, etc., can solve problems such as power leakage, and achieve the effect of preventing false triggering

Pending Publication Date: 2021-03-16
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in a two-switch flyback converter, the demagnetization voltage of the leakage inductor has a strong dependence on the input voltage and the load voltage
The inductor is designed to discharge more on the secondary side if the input voltage is high; otherwise it tends to leak power into the primary side
Therefore, the difference between the peak currents in the primary and secondary windings cannot be compensated with a fixed correction

Method used

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  • A flyback converter and LED driver using the flyback converter
  • A flyback converter and LED driver using the flyback converter
  • A flyback converter and LED driver using the flyback converter

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Embodiment Construction

[0074] The present invention will be described with reference to the accompanying drawings.

[0075] It should be understood that the detailed description and specific examples, while indicating exemplary embodiments of apparatus, systems and methods, are intended for purposes of illustration only and are not intended to limit the scope of the disclosure. These and other features, aspects and advantages of the devices, systems and methods of the present invention will be better understood from the following description, appended claims and accompanying drawings. It should be understood that the drawings are only schematic and not drawn to scale. It should also be understood that the same reference numbers are used throughout the drawings to indicate the same or similar parts.

[0076] The present invention provides a two-switch flyback converter in which the output current in an operating region where a constant output current is required can be regulated from the primary sid...

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Abstract

A dual-switch flyback converter in which the output current, in operating regions where a constant output current is required, can be regulated from the primary side. The output current is regulated constantly regardless of the input and output voltages by compensating the peak current in the primary winding with the average current in the clamping diode, or the conduction duration of the clampingdiode.

Description

technical field [0001] The invention relates to flyback converters, eg for use in LED drivers. Background technique [0002] Flyback converters are used for AC / DC and DC / DC conversion, providing galvanic isolation between the input and any output. The flyback converter acts as a buck-boost converter, the inductor is split to form a transformer, so the voltage ratio is doubled and has the added advantage of isolation. [0003] During the on-state of the converter, energy is transferred from the input voltage source to the transformer, during which time the output capacitor supplies energy to the output load. In the off state, energy is transferred from the transformer to the output load (and output capacitor). This is called the freewheeling phase. [0004] One design of particular interest is the dual switch design. This utilizes two transistors between the input voltage and the transformer so that the total voltage stress is divided equally across the two transistors. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H05B45/385H05B44/00
CPCH02M3/33507H02M3/33523H05B45/385H02M1/0038H02M1/0009H02M1/0025H02M3/33573Y02B70/10
Inventor 周玉飞D·J·A·克莱森斯罗恒廉
Owner SIGNIFY HLDG BV