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DC-DC convertor with fault prevention function

A technology of DC converters and transformers, applied in the direction of converting DC power input to DC power output, converting equipment with intermediate conversion to AC, and converting irreversible AC power input to DC power output, etc.

Inactive Publication Date: 2005-11-16
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both modes have stability

Method used

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  • DC-DC convertor with fault prevention function
  • DC-DC convertor with fault prevention function
  • DC-DC convertor with fault prevention function

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Embodiment Construction

[0018] Detailed Description of Preferred Embodiments

[0019] While making and using various embodiments of the invention are discussed in detail below, it should be appreciated that the invention provides many applicable inventive concepts that can be employed in a wide variety of specific contexts. The specific embodiments discussed herein are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention. The discussion here concerns logic integrated circuits, and more specifically, a new simplified DC-DC module with synchronous rectification that can be connected in parallel with other DC-DC modules. Thus, the present invention prevents fault conditions during normal steady state, start and stop conditions. Furthermore, the invention is particularly applicable to portable electronic devices such as computers, personal digital assistants and communication devices.

[0020] The invention provides a simple solution for parall...

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Abstract

The present invention provides a method for preventing a fault condition in a DC-DC converter (10, 20, 50) having a first secondary winding (Ns1) coupled to a first synchronous rectifier (SQ1) and a second secondary winding (Ns2) coupled to a second synchronous rectifier (SQ2). The first synchronous rectifier (SQ1) is turned on based on a voltage across the first secondary winding (Ns1) and is turned off based on a first driver signal. The second synchronous rectifier (SQ2) is turned on based on a voltage across the second secondary winding (Ns2) and is turned off based on a second driver signal. The present invention also provides a DC-DC converter (10, 20, 50) wherein a first control circuit is coupled to and controls the first synchronous rectifier (SQ1) pursuant to the method described above, and a second control circuit is coupled to and controls the second synchronous rectifier (SQ2) pursuant to the method described above.

Description

field of invention [0001] The present invention is directed generally to voltage converters, and more specifically to a system-level solution for overcoming the problem of paralleling modules with synchronous rectification. [0002] This patent application claims the benefit of a co-pending, earlier-filed US Provisional Patent Application, Application No. 60 / 178,683, filed January 28,2000. Background of the invention [0003] The choice of topology for next-generation on-board DC / DC converters is mainly determined by the necessity of having high power density. To achieve high power density, the efficiency of off-board DC / DC modules must be maximized. In applications requiring large step-down ratios, such as stepping down from 48V to 5V, 3.3V, 2.5V, etc., losses in the secondary rectifier dominate. To reduce these losses, synchronous rectification can be used. Synchronous rectification has gained a great deal of popularity over the past decade as low-voltage semiconductor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/21H02J1/10H02M3/28H02M3/335
CPCH02J1/102Y02B70/1475H02M3/33592H02J1/001Y02B70/10
Inventor R·W·法林顿C·斯瓦兹约W·哈特
Owner TELEFON AB LM ERICSSON (PUBL)