昇圧型dc−dcコンバータおよび電源駆動用半導体集積回路

Step-up dc-dc converter and semiconductor integrated circuit for driving power supply

Abstract

<P>PROBLEM TO BE SOLVED: To provide a step-up DC-DC converter capable of performing smooth start even when the stepped-up voltage is not yet generated, and capable of delaying battery consumption when the battery is used as an input power supply, suppressing an increase in consumption current. <P>SOLUTION: The step-up DC-DC converter includes: a drive element (SW1) in which an inductor and a rectifying element are connected in series between a voltage input terminal and an output terminal and a current is allowed to flow through the inductor; and a control circuit (10) which generates a signal for controlling a driving element according to a feedback voltage from an output side and outputs the generated signal. In the step-up DC-DC converter, a power supply switching circuit (30) is provided which includes: a first diode (D2) with an anode terminal connected to the voltage input terminal, and a cathode terminal connected to a power supply voltage terminal of the control circuit; and a second diode (D3) with the anode terminal connected to the output terminal and the cathode terminal connected to the power supply voltage terminal of the control circuit, and is constituted so that a higher voltage out of an input voltage or an output voltage is supplied to the control circuit as a power supply voltage. <P>COPYRIGHT: (C)2010,JPO&INPIT
【課題】昇圧した電圧が発生していない場合にも起動が円滑に行なえるとともに、消費電流の増加を抑制して電池を入力電源とする場合に電池の消耗を遅くすることができる昇圧型DC−DCコンバータを提供する。 【解決手段】電圧入力端子と出力端子との間にインダクタと整流素子が直列形態に接続され、インダクタに電流を流す駆動素子(SW1)と出力側からのフィードバック電圧に応じて駆動素子を制御する信号を生成し出力する制御回路(10)とを備えた昇圧型DC−DCコンバータにおいて、電圧入力端子にアノード端子が接続されカソード端子が制御回路の電源電圧端子に接続された第1ダイオード(D2)と出力端子にアノード端子が接続されカソード端子が制御回路の電源電圧端子に接続された第2ダイオード(D3)とを有する電源切替え回路(30)を設け、入力電圧または出力電圧のうち高い方の電圧を制御回路へ電源電圧として供給するように構成した。 【選択図】図1

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Cited By (3)

    Publication numberPublication dateAssigneeTitle
    JP-2011188647-ASeptember 22, 2011Toshiba Corp, 株式会社東芝Dc/dc converter
    JP-2015104160-AJune 04, 2015三菱電機株式会社, Mitsubishi Electric Corp, 三菱電機照明株式会社点灯装置および照明器具
    US-9224757-B2December 29, 2015Semiconductor Energy Laboratory Co., Ltd.DC-DC converter and manufacturing method thereof