スイッチング電源装置

Switching power supply device

Abstract

(57)【要約】 【課題】 入力電圧や出力電圧の変動、出力短絡を生じ た場合にも、同期整流回路のスイッチ素子を駆動する駆 動回路に安定した駆動電圧を供給し得るスイッチング電 源装置を提供する。 【解決手段】 同期整流回路5を駆動する駆動回路13 は、制御回路9から絶縁結合回路11を介して供給され る制御信号CS12に基づいて生成された駆動信号CS 21、CS22により、同期整流回路5に含まれる整流 用スイッチ素子51を、スイッチ回路3に含まれるスイ ッチ素子31と同期して制御する。補助電源回路15 は、制御回路9から絶縁結合回路11を介して供給され る制御信号CS12を整流平滑して直流電圧Vc1を生 成し、直流電圧Vc1を、動作電圧として、駆動回路1 3に供給する。
PROBLEM TO BE SOLVED: To provide a switching power device capable of supplying stable driving voltage to a driving circuit driving the switching element of a synchronous rectifying circuit even if a fluctuation in input voltage or output voltage, or output short-circuit occurs. SOLUTION: A driving circuit 13 driving a synchronous rectifying circuit 5 controls a switching element 51 for rectification included in the synchronous rectifying circuit 5 synchronously with a switching element 31 included in a switching circuit 3, by driving signals CS21, CS22 generated based on a control signal CS12 supplied from a control circuit 9 through an insulation coupling circuit 11. An auxiliary power circuit 15 rectifies and smoothens the control signal CS12 supplied from the control circuit 9 through the insulation coupling circuit 11 to generate DC voltage Vc1, and the Vc1 is supplied to a driving circuit 13 as operating voltage.

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Cited By (13)

    Publication numberPublication dateAssigneeTitle
    JP-2002354800-ADecember 06, 2002Fujitsu Ltd, 富士通株式会社同期整流型コンバータ
    JP-2007166794-AJune 28, 2007Origin Electric Co Ltd, オリジン電気株式会社Power supply circuit
    JP-2008187788-AAugust 14, 2008Densei Lambda Kk, デンセイ・ラムダ株式会社Switching power supply
    JP-4545988-B2September 15, 2010富士通株式会社同期整流型コンバータ
    JP-4745043-B2August 10, 2011オリジン電気株式会社電源回路
    JP-5012807-B2August 29, 2012株式会社村田製作所ダブルエンド絶縁型dc−dcコンバータ
    US-7596009-B2September 29, 2009Murata Manufacturing Co., Ltd.Double-ended isolated DC-DC converter
    US-7701733-B2April 20, 2010System General Corp.Method and apparatus to provide synchronous rectifying circuit for offline power converters
    US-7701736-B2April 20, 2010System General Corp.Synchronous rectifying circuit for resonant power converters
    US-7787264-B2August 31, 2010System General Corp.Apparatus to provide synchronous rectifying circuit for flyback power converters
    US-7885084-B2February 08, 2011System General Corp.Control circuit for synchronous rectifying and soft switching of power converters
    US-7974108-B2July 05, 2011System General Corp.Synchronous rectifying circuit for offline power converter
    WO-2008041399-A1April 10, 2008Murata Manufacturing Co., Ltd.Convertisseur cc-cc d'isolation à double extrémité