Unlock instant, AI-driven research and patent intelligence for your innovation.

Synchronous rectifying circuit of power converter

A power converter and synchronous rectification technology, which is applied in the direction of conversion equipment with intermediate conversion to AC, and can solve problems such as power loss and increased system complexity

Active Publication Date: 2007-04-11
SEMICON COMPONENTS IND LLC
View PDF1 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current sense circuit and phase lock circuit will generate power loss and increase the complexity of the system
In addition, wide-variable frequency systems such as resonant power converters will cause phase-locking problems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Synchronous rectifying circuit of power converter
  • Synchronous rectifying circuit of power converter
  • Synchronous rectifying circuit of power converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] FIG. 3 is a schematic circuit diagram of a switch-mode power converter including a preferred embodiment of the synchronous rectification circuit of the present invention. This synchronous rectification circuit is suitable for power converters operating at fixed frequency and / or variable frequency and does not require current sensing or phase locking circuits. A power switch 20 in a switch mode power converter is coupled to a transformer (magnetic device) 10 for rectification. The switch control circuit 100 responds to the magnetized voltage (magnetized voltage) V of the transformer 10 S , demagnetized voltage (demagnetized voltage) and magnetized time (magnetized time) to generate the control signal S output by the output terminal OUT W . control signal S W Coupled to turn on the power switch 20 . where the control signal S W The enable period (enable period) of the transformer is related to the demagnetized time of the transformer.

[0018] When the switch 15 is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

This invention provides a synchronous rectifying circuit of a power switch operating at fixed or variable frequencies not needing current sensing circuit or phase-locking circuit, in which, the synchronous rectifying circuit has a supply switch coupled to the transformer for rectification, a signal generation circuit is used in responding to the magnetized voltage, the demagnetized voltage and the magnetized period of the transformer to generate control signals to control the conduction of supply switch after coupling, the working period of the control signal is related to the demagnetized period.

Description

technical field [0001] The present invention relates to power converters, and more particularly to control circuits for switching mode power converters. Background technique [0002] FIG. 1 illustrates a conventional power converter with a synchronous rectifier for improving power conversion efficiency. A magnetic device such as a transformer 10 includes a primary winding N P and the secondary winding N S . Switch 15 is connected to the primary side winding N P to switch the transformer 10 and regulate the output of the power converter. Secondary side winding N S Coupled to the output of the power converter through a power switch 20 and a capacitor 30 . The power switch 20 and its body diode 25 operate as a synchronous rectifier. The voltage V E applied to the primary winding N P . Therefore, the charging current I C will be based on the voltage V E and primary winding N P produced by the inductance coefficient. At the same time, on the secondary winding N S A...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28
Inventor 杨大勇
Owner SEMICON COMPONENTS IND LLC