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Flyback power converter with divided energy transfer element

A power converter and energy transfer technology, applied in the field of energy transfer, can solve problems such as increased current distribution, uneven output brightness and color, and increased costs

Inactive Publication Date: 2012-07-11
POWER INTEGRATIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using multiple LED strings while driving each string with a separate current controller creates many complexities
For example, there is the added complexity of providing balanced current distribution for all the individual LED strings
Unbalanced current can lead to undesired uneven output brightness and color from multiple LED strings
Additionally, by employing multiple separate current controllers to drive each of the multiple individual LED strings, additional components are required, driving up the cost of powering multiple LED strings

Method used

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  • Flyback power converter with divided energy transfer element
  • Flyback power converter with divided energy transfer element
  • Flyback power converter with divided energy transfer element

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Embodiment Construction

[0019] Methods and apparatus are described for implementing a flyback power converter with an energy transfer element having a split structure. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that the specific details need not be employed to practice the present invention. In other instances, well-known materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0020] Reference throughout this specification to "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described with respect to the embodiment or example is included in the In at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "an example," or "an example" in various place...

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Abstract

A divided structure energy transfer assembly for use in a flyback power converter is disclosed. An example energy transfer includes first and second magnetic cores. First and second input windings are wound around the first and second magnetic cores, respectively. The first input winding is coupled in parallel with the second input winding. First and second output windings are wound around the first and second magnetic cores, respectively. A rectified output of the first output winding is coupled in series with a rectified output of the second output winding. The first and second input windings have a first polarity and the first and second output windings have a second polarity. The first polarity is an opposite of the second polarity.

Description

technical field [0001] The present invention relates generally to energy transfer. More particularly, the present invention relates to divided energy transfer elements for use in flyback power converters. Background technique [0002] A wide variety of ac-dc and dc-dc power supplies are used in applications ranging from industrial equipment to household appliances, for example. Flyback power converters are often an attractive design choice because of their expected characteristics and the isolation they provide. Known flyback power converters operate by storing energy in the magnetic field of the energy transfer element when the power switch is on and delivering energy to the output load when the power switch is off. The energy transfer elements, such as transformers or coupled inductors, in an isolated flyback power converter behave like a transformer with input and output windings having opposite polarities. It should be understood that energy transfer elements are ofte...

Claims

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Application Information

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IPC IPC(8): H02M3/335H01F38/14H01F27/28
CPCH01F2027/408H01F38/42Y02B20/202H05B33/0815H02M7/10H02M3/28H05B45/382H05B45/385
Inventor J·姚
Owner POWER INTEGRATIONS INC
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