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Synchronous rectifier

A device and detector technology, applied in the field of power supply, can solve problems such as high price

Inactive Publication Date: 2008-09-24
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These ICs, such as ST Microelectronics STS-R3 or Anachip AP436, are somewhat expensive and require an additional 4 to 8 external components

Method used

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Examples

Experimental program
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Embodiment Construction

[0013] figure 2 The illustrated embodiment of the discrete control circuit meets the need for a low cost, synchronous rectifier controller. figure 2 A representative switching power supply applied in electronic equipment is shown. The primary side circuit 150 is a typical switching power supply, which is well known to those skilled in the art, and is similar to the aforementioned power supplies. The switching transformer 116 has multiple secondary windings 122 and 124 to obtain different supply voltages. Diode 128 acts as a conventional rectifier in this system. Using this high-side rectifier for the +6.5V supply serves a dual purpose: to signal S from winding 122 3 is rectified to produce a +6.5V supply, and therefore, the AC signal S at the anode of diode 128 3 can be used to obtain the switching control signals that drive the MOSFET 214 of the synchronous rectifier. MOSFET transistors can be used as rectifiers by controlling the conduction time of the MOSFET to coinc...

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PUM

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Abstract

The disclosed embodiments relate to apparatus and method for reducing power losses in a power supply. There is provided an apparatus comprising means (214) for coupling a first signal (S2) to a reference level (ground) when the coupling means is conductive, means (202, 204) for placing the coupling means in a conductive state during a duration of a portion of a period of a second signal (S3), and means (206) for altering the duration of conduction of the coupling means in response to an amplitude of the second signal.

Description

technical field [0001] This invention relates generally to the field of power supplies, and more particularly to the use of synchronous rectification in switching power supplies. Background technique [0002] Such as figure 1 As shown, a typical switched mode power supply (SMPS) includes: a primary side component 150 and a secondary side component. Primary side (also referred to as "hot side") components include switch controller 106, switching metal oxide semiconductor (MOSFET) 108, MOSFET heat sink 110, current sense resistor 112, inrush current suppression capacitor 114, with primary winding 120 and Transformer 116 of secondary winding 118 , rectifier diode 102 , filter capacitor 104 and opto-isolator 126 . Secondary or “cold side” components include secondary transformer windings 122 and 124 , rectifier diodes 128 , 136 and respective heat sinks 130 , 138 , and filter capacitors 132 and 134 . The entire switching power supply is powered by an unregulated voltage sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCY02B70/1475
Inventor 威廉·文森特·菲茨杰拉德
Owner THOMSON LICENSING SA