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Flyback converter with synchronous rectifier

A technology of synchronous rectifiers and converters, applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve the problem of reducing the available area of ​​printed circuit boards, increasing production costs, and complicating the drive circuit of synchronous switches And other issues

Inactive Publication Date: 2006-04-26
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0024] However, the conventional flyback converter described above is disadvantageous in that the synchronous switch drive circuit is complicated because a secondary auxiliary coil is necessary for supplying the drive voltage to the synchronous switch and the flyback converter is Operate with DCM and CCM
Furthermore, in order to prevent RRC, Schottky diodes must be connected in parallel to the synchronous switch, which causes a reduction in the available area of ​​the printed circuit board (PCB) and thus increases the production cost

Method used

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  • Flyback converter with synchronous rectifier
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  • Flyback converter with synchronous rectifier

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Embodiment Construction

[0037] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings, the same or similar elements are denoted by the same reference numerals even if they are described in different drawings.

[0038] Image 6 is a circuit diagram showing the construction of a flyback converter according to the present invention.

[0039] refer to Image 6, the flyback converter according to the present invention includes: a flyback switch controller 100 for switching the main switch MS in critical conduction mode on the basis of the feedback voltage to convert the voltage Vs into high-frequency pulses; a transformer TF with a The primary coil L1 and the secondary coil L2 receiving high-frequency pulses; the feedback controller 200 is used to detect the output voltage between the first output line OL1 and the second output line OL2, wherein the first output line and the second output line are respectively connected t...

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Abstract

The present invention discloses a flyback converter with a synchronous rectifier, which is applied to a power supply of a portable computer such as a notebook personal computer. The flyback converter operates in critical conduction mode to turn on / off the main switch at zero crossings of the output voltage. The flyback converter is also adapted to use the output voltage to provide a drive voltage to the synchronous switch. Therefore, the secondary auxiliary winding of the transformer and the Schottky diode connected in parallel with the synchronous switch are not required, thereby simplifying the circuit design.

Description

[0001] related application [0002] This application claims priority from Korean Application No. 2004-84637 filed on October 22, 2004, the disclosures of which are incorporated herein by reference. technical field [0003] The present invention relates to a flyback converter applied to a power supply of a portable computer such as a notebook personal computer, and more particularly to a flyback converter having a synchronous rectifier operating in a critical conduction mode To turn on / off the main switch at the zero-crossing point of the output voltage and suitable for using the output voltage to provide the drive voltage to the synchronous switch, resulting in no secondary auxiliary coil of the transformer and no Schottky diode connected in parallel to the synchronous switch, thus simplifying circuit design. Background technique [0004] Recently, electronic and power-consuming devices have been provided with functions required by an increasing number of users, have been i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M3/00
CPCH02M3/33592Y02B70/10H02M3/335
Inventor 张赞圭安泰荣金容柱金圣哲朴台煜
Owner SAMSUNG ELECTRO MECHANICS CO LTD
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