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Feedback bias control circuit of synchronous rectifier

By designing the control circuit in the non-isolated DC-DC buck converter, using the comparator and drive circuit to prevent the synchronous rectifier from turning on during the soft start period, the problem of synchronous rectifier feedback bias is solved and the stability and efficiency of the system are achieved. improvement while reducing costs.

Inactive Publication Date: 2009-09-02
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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Examples

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Effect test

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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PUM

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Abstract

A circuit is disclosed that effectively prevents turn-on of a synchronous rectifier in a buck converter during predetermined conditions, thereby preventing reverse current flow through the synchronous rectifier during the period. In one embodiment, the circuit provides synchronous rectifier control during soft-start for a non-isolated DC-DC buck converter, preventing current reversal during the soft-start process, known as a reverse bias condition. flow (consumption). In another embodiment, a circuit uses a signal indicative of the soft start state of the converter to prevent the synchronous rectifier from turning on during the soft start. A corresponding system also solves the above-mentioned synchronous rectifier back-biasing problem for a converter in a parallel converter configuration.

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 Patents(China)
IPC IPC(8): H02M3/02H02M1/08H02M1/00H02M3/158
CPCY02B70/1466H02M3/1588H02M1/32Y10S323/901H02M1/36Y02B70/10
Owner ASTEC INT LTD
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