JP4052998B2 - 電源回路及びそれを用いた電子機器 - Google Patents
電源回路及びそれを用いた電子機器 Download PDFInfo
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- JP4052998B2 JP4052998B2 JP2003393340A JP2003393340A JP4052998B2 JP 4052998 B2 JP4052998 B2 JP 4052998B2 JP 2003393340 A JP2003393340 A JP 2003393340A JP 2003393340 A JP2003393340 A JP 2003393340A JP 4052998 B2 JP4052998 B2 JP 4052998B2
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- Prior art keywords
- circuit
- voltage
- output
- output voltage
- power supply
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S323/00—Electricity: power supply or regulation systems
- Y10S323/901—Starting circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Protection Of Static Devices (AREA)
Description
2 入力コンデンサ
3 コイル
4 ダイオード(整流素子)
5 出力コンデンサ
10 昇圧チョッパレギュレータ
11、12 FET(スイッチング素子)
13 ドライブ回路
14 電流検出コンパレータ
15 発振回路
16 アンプ
17 PWMコンパレータ
18 エラーコンパレータ
19、26 基準電源
20 ソフトスタート回路
21 ON/OFF回路(作動/停止回路)
22 過熱保護回路
23 過電圧保護回路
24 出力電圧検出回路
25、27 コンパレータ
28 フィードバック電圧検出回路
29 過電圧保護回路(出力電圧検出回路)
30 入力電圧検出回路
R1 抵抗(出力電流検出抵抗)
R2〜R6 抵抗
LED1〜LED6 白色発光ダイオード(負荷)
Claims (7)
- 直流電源の一方にその一端が接続されたコイルと、
前記コイルの他端と負荷の一端との間に接続された整流素子と、
前記負荷に流れる出力電流を検出する出力電流検出抵抗と、
前記整流素子と前記負荷の接続点とグランド間に接続されて、充電されることによって出力電圧をその両端に発生する出力コンデンサと、
前記コイルの他端とグランド間に接続されたスイッチング素子と、
前記出力電流検出抵抗の両端に発生する電圧に応じて、前記スイッチング素子を第1のPWM方式で制御して前記出力電圧を昇圧させるドライブ回路と、
第2のPWM方式で制御された第1状態または第2状態をとる外部入力信号を受けるとともに、前記外部入力信号が第2状態の時には前記昇圧を停止させて、前記出力電流の量を制御する作動/停止回路と、
前記充電がなされていない状態で前記外部入力信号が第1状態となったときには、前記出力電圧を緩やかに立ち上げるように前記ドライブ回路を制御するソフトスタート処理を実行する一方、前記充電がなされている状態で前記外部入力信号が第1状態となったときには、前記ソフトスタート処理を実行しない、ソフトスタート回路と、
を設けたことを特徴とする電源回路。 - 前記出力電圧と所定電圧とを比較して、該比較の結果に応じた信号である比較結果信号を、前記ソフトスタート回路に出力する出力電圧検出回路を有し、
前記所定電圧は、
前記充電がなされているとともに前記昇圧が停止されている状態での前記出力電圧より小さく、かつ、前記充電がなされていないとともに前記昇圧が停止されている状態での前記出力電圧より大きく設定されていることを特徴とする請求項1に記載の電源回路。 - 前記出力電圧が所定の過電圧保護電圧より高くなると前記ドライブ回路の動作を停止させる過電圧保護回路を有することを特徴とする請求項2に記載の電源回路。
- 前記過電圧保護回路は前記出力電圧検出回路に含まれることを特徴とする請求項3に記載の電源回路。
- 前記ソフトスタート回路は、
前記比較結果信号に基づいて、前記充電がなされているか否かを判別することを特徴とする請求項2に記載の電源回路。 - 請求項1から請求項5の何れかに記載の電源回路を用いたことを特徴とする電子機器。
- 前記負荷が、液晶表示装置のバックライトまたはフロントライトの発光素子であり、前記作動/停止回路が前記液晶表示装置のバックライトまたはフロントライトの輝度調整用回路であることを特徴とする請求項6に記載の電子機器。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003393340A JP4052998B2 (ja) | 2003-11-25 | 2003-11-25 | 電源回路及びそれを用いた電子機器 |
US10/982,826 US7129679B2 (en) | 2003-11-25 | 2004-11-08 | Power supply circuit having soft start |
CNB2004100978241A CN100379135C (zh) | 2003-11-25 | 2004-11-25 | 电源电路 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003393340A JP4052998B2 (ja) | 2003-11-25 | 2003-11-25 | 電源回路及びそれを用いた電子機器 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2007126530A Division JP4558001B2 (ja) | 2007-05-11 | 2007-05-11 | 電源回路 |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2005160178A JP2005160178A (ja) | 2005-06-16 |
JP2005160178A5 JP2005160178A5 (ja) | 2007-03-22 |
JP4052998B2 true JP4052998B2 (ja) | 2008-02-27 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003393340A Expired - Fee Related JP4052998B2 (ja) | 2003-11-25 | 2003-11-25 | 電源回路及びそれを用いた電子機器 |
Country Status (3)
Country | Link |
---|---|
US (1) | US7129679B2 (ja) |
JP (1) | JP4052998B2 (ja) |
CN (1) | CN100379135C (ja) |
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2003
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2004
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US7129679B2 (en) | 2006-10-31 |
US20050110469A1 (en) | 2005-05-26 |
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JP2005160178A (ja) | 2005-06-16 |
CN100379135C (zh) | 2008-04-02 |
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