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Synchronous rectifying circuit of power converter

A technology of power converter and synchronous rectification, which is applied in the direction of conversion equipment with intermediate conversion to AC

Active Publication Date: 2011-11-09
SEMICON COMPONENTS IND LLC
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  • 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

Method used

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  • Synchronous rectifying circuit of power converter
  • Synchronous rectifying circuit of power converter
  • Synchronous rectifying circuit of power converter

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] image 3 A schematic circuit diagram of a switch-mode power converter including a preferred embodiment of the synchronous rectification circuit of the present invention is shown. 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.

[0020] When the swit...

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PUM

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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 invention involves a power converter, and it is clearer to say that the control circuit of the switch -type power converter is involved. Background technique [0002] figure 1 Draw the power converter with a synchronous rectifier for improving power conversion efficiency.Magnetic device, such as a transformer 10, contains a side winding n P And secondary winding n S EssenceSwitch 15 Connect to one side winding n P The output of the switch transformer 10 and the adjustment power converter.Second -side winding n S Power switch 20 and capacitor 30 coupling to the output of power converter.Power switch 20 and its main diode 25 are operated by synchronous rectifier.The voltage V response to the connection to the switch 15 during the magnetization cycle E Apply to one side winding N P EssenceTherefore, charging current i C Based on voltage V E And one side winding n P The inductance coefficient is generated.At the same time, in the secondary winding N S Magn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28
Inventor 杨大勇
Owner SEMICON COMPONENTS IND LLC