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Synchronous rectifier

A synchronous rectifier and synchronous rectification technology, which is applied in the direction of instruments, converting DC power input to DC power output, adjusting electrical variables, etc., can solve the problem of high price

Active Publication Date: 2013-01-09
INTERDIGITAL CE PATENT HLDG
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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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Experimental program
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Embodiment Construction

[0014] 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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Abstract

The invention relates to a synchronous rectifier. The embodiment of the invention relates to equipment and a method for reducing the power consumption of a power supply. The invention provides the equipment, which comprises elements (214, 202, 204 and 206), wherein the element (214) is used for connecting a first signal (S2) to a reference level (an earth potential) when a connecting element is conducted; the elements (202 and 204) are used for setting the connecting element to be in a conduction state in part of duration of a period of a second signal (S3); and the element (206) is used for responding to the amplitude of the second signal and changing the conduction duration of the connecting element.

Description

[0001] This application is a divisional application of an invention patent application with an application date of September 28, 2005, an application number of 200580051717.8, and an invention title of "Synchronous Rectifier". technical field [0002] 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 [0003] 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 in...

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 INTERDIGITAL CE PATENT HLDG