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Asymmetric switch forward converter

A technology of power converters and transformers, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., and can solve the problem of not being able to use the additional degrees of freedom of the system cost

Inactive Publication Date: 2013-09-18
POWER INTEGRATIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a design does not take advantage of the additional degrees of freedom that can reduce system cost

Method used

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  • Asymmetric switch forward converter
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  • Asymmetric switch forward converter

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Embodiment Construction

[0016] Methods and apparatus are disclosed for implementing a switching circuit for reducing energy dissipation in a power converter having mismatched switches. 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 these 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.

[0017] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in one embodiment," "in an embodiment," "an example," or "example" i...

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Abstract

A method and apparatus for controlling a power converter. In one aspect, a controller for use in a power converter includes a first calculator coupled to determine an end of an on time of a power switch of the power converter by integrating an input current to output an on time signal representative of the end of the on time of the power switch. The controller also includes a second calculator coupled to determine an end of an off time of the power switch by integrating a difference between an input voltage and an output voltage to output an off time signal representative of the end of the off time of the power switch.

Description

technical field [0001] The present invention relates generally to power supplies, and more particularly, the present invention relates to forward converters. Background technique [0002] AC-to-DC and DC-to-AC power supplies typically use a power conversion topology, commonly known as a two-switch forward converter (ie, a forward converter with two active switches). [0003] A two-switch forward converter typically uses two active switches and two passive switches in a configuration that applies the input voltage to the primary winding of the transformer. A secondary winding on the transformer produces a scaled voltage in response to an input voltage applied to the primary winding. The voltage on the secondary winding is rectified and filtered to produce an output voltage. The passive switch allows the magnetizing energy of the transformer to be reset when the active switch is turned off. Allowing the transformer's magnetizing energy to reset (ie, return to a much lower v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353H02M3/335
Inventor 罗伯特·J·马耶尔
Owner POWER INTEGRATIONS INC