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DC-DC power converters and methods of operating DC-DC power converters

A power converter, DC-DC technology, applied in the direction of high-efficiency power electronic conversion, output power conversion devices, instruments, etc., can solve the problem of not realizing ZVS operation, etc.

Active Publication Date: 2019-12-03
ASTEC INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, ZVS operation is not achieved when the reflected output voltage is lower than the DC input voltage

Method used

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  • DC-DC power converters and methods of operating DC-DC power converters
  • DC-DC power converters and methods of operating DC-DC power converters
  • DC-DC power converters and methods of operating DC-DC power converters

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Embodiment Construction

[0022] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0023] Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth, such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the invention. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms, and that neither specific details nor example embodiments should be construed to limit the invention. scope. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0024] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. As used ...

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PUM

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Abstract

The invention relates toDC-DC power converters and methods of operating DC-DC power converters. A DC-DC power converter includes an input, an output, a transformer, a primary field-effect transistor (FET), and a synchronous rectifier. The synchronous rectifier includes a drain that experiences multiple resonant voltage valleys during each dead-time period of the converter. The converter further includes a synchronous rectifier drive circuit configured to turn on and turn off the synchronous rectifier, and a primary control circuit. The primary control circuit is configured to operate the primary FET in a valley skipping mode, and to transmit a drive signal to the synchronous rectifier drive circuit to turn on the synchronous rectifier during a specified one of the multiple resonant voltagevalleys to generate a negative current through the synchronous rectifier. Methods of operating a DC-DC power converter are also disclosed.

Description

technical field [0001] The present invention relates to a DC-DC power converter and a method of operating a DC-DC converter. Background technique [0002] This section provides background information related to the present disclosure which is not necessarily prior art. [0003] Flyback converters are often used in low power applications because they can operate over a wide input voltage range, provide isolation, require fewer components, etc. Among flyback converters, variable frequency flyback converters (often referred to as Quasi-Resonant (QR) flyback converters) operate at lower frequencies during full load conditions and Increase its operating frequency as the load decreases. [0004] During the on-time of a switch in a flyback converter, power can be dissipated in the switch through turn-on losses and conduction losses. A quasi-resonant flyback converter can eliminate or partially eliminate turn-on losses by using a valley-switching mode of operation. In quasi-reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592H02M1/08H02M3/33507H02M3/33523H02M1/0009H02M1/0058Y02B70/10H02M3/3353
Inventor 詹姆斯·西加马尼安东尼奥·R·索列诺肯尼斯·R·拉佐
Owner ASTEC INT LTD