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Feedback bias control circuit of synchronous rectifier

A synchronous rectifier, feedback signal technology

Inactive Publication Date: 2004-10-13
ASTEC INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this exemplary system, since the synchronous rectifiers allow reverse current flow, for example, repeated application of one or more modules while the system is running, turning on each paralleled module at a different time, etc., may cause the system to fail

Method used

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  • Feedback bias control circuit of synchronous rectifier
  • Feedback bias control circuit of synchronous rectifier
  • Feedback bias control circuit of synchronous rectifier

Examples

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Embodiment Construction

[0020] The present invention overcomes the disadvantages of known prior art circuits. Figure 5 A preferred embodiment of the circuit for each converter in a system in which the converters are connected in parallel is given. Converter 200 has an input terminal 104 coupled to a DC input voltage V with respect to ground in , and an output terminal 122 that outputs the DC output voltage V of each converter module with respect to ground O . Converter 200 includes a control circuit 250 coupled to buck converter 102 having synchronous rectifier 118 . Buck converter 102 includes a switch 106 , an inductor 114 , and a capacitor 116 connected between input terminal 104 and output terminal 122 in a conventional manner. An example load shown for R L coupled to the output of converter 200. Switch 106 is typically a power MOSFET that responds to the output voltage V O The PWM 166 is controlled in a known manner. When the switch 106 is closed, the capacitor 116 is charged by the inpu...

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Abstract

The invention discloses a kind of circuit; the circuit inhibits the open of a synchronous commutator in step-down converter effectively in preset state period, thus inhibits the current flows through the synchronous commutator reversely in the period. In an example, the invention provides synchronous commutator control to a direct-direct current step-down converter in the soft start period, thus it can inhibit the current from reversely flow in the period. Another example, a circuit uses a signal of instructing converter soft start state, in order to inhibit the synchronous commutator from being opened in the soft start period. The invention also solves the problem of feedback voltage potential of synchronous commutator in parallel converter.

Description

technical field [0001] The invention relates to a power converter, in particular to a circuit for controlling the feedback bias voltage of a synchronous rectifier in a non-isolated DC-DC step-down converter. technical background [0002] In non-isolated DC-DC buck converters, synchronous rectifiers have gradually replaced unidirectional diodes in order to improve the converter's power conversion efficiency. A characteristic of a non-isolated DC-DC converter with synchronous rectification is that current can flow not only through the synchronous rectifier to the output terminals, but also from the output terminal back to the converter, i.e., a non-isolated DC-DC converter with synchronous rectification A DC-DC converter has both current sourcing and current sinking capabilities. [0003] figure 1 shows a conventional buck converter. As is well known, a basic buck converter consists of a switch 6, an input filter capacitor 8, a unidirectional diode 12, an inductor 14 and a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M3/158
CPCY02B70/1466H02M3/1588H02M1/32Y10S323/901H02M1/36Y02B70/10
Inventor 黄宏克丽斯·M·杨
Owner ASTEC INT LTD
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