JPS57113123A - Soft-starting circuit for constant-current power source - Google Patents

Soft-starting circuit for constant-current power source

Info

Publication number
JPS57113123A
JPS57113123A JP18788180A JP18788180A JPS57113123A JP S57113123 A JPS57113123 A JP S57113123A JP 18788180 A JP18788180 A JP 18788180A JP 18788180 A JP18788180 A JP 18788180A JP S57113123 A JPS57113123 A JP S57113123A
Authority
JP
Japan
Prior art keywords
voltage
current
gradually
constant
power source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP18788180A
Other languages
Japanese (ja)
Other versions
JPH0120767B2 (en
Inventor
Tamio Onuma
Jun Senda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP18788180A priority Critical patent/JPS57113123A/en
Publication of JPS57113123A publication Critical patent/JPS57113123A/en
Publication of JPH0120767B2 publication Critical patent/JPH0120767B2/ja
Granted legal-status Critical Current

Links

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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Dc-Dc Converters (AREA)

Abstract

PURPOSE:To achieve a stable start by applying a reference voltage to the reference input terminal of an error amplifier, by connecting two resistances between a control input terminal and a current detecting resistance, and by connecting a circuit which lowers a voltage at the connection point gradually from a start point. CONSTITUTION:When a switch S1 is opened at a start point, a current from a power source E is charged in a capacitor C13 through a transistor TR1 and a resistance R23, and while its terminal voltage rises toward a voltage E, the base current of the TR1 decreases, so that the TR1 turns off. Consequently, a potential V2 at the connection point between resistances R63 and R53 drops gradually toward a detected voltage, and the output current I0 of a converter 2 rises gradually; when the potential V2 reaches the voltage VD, a diode D1 turns off and the output current I0 becomes a constant current. In this case, a reference input Vref to an error amplifier 2a is made constant and the voltage V2 is lowered gradually to increase the output current I0.
JP18788180A 1980-12-29 1980-12-29 Soft-starting circuit for constant-current power source Granted JPS57113123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18788180A JPS57113123A (en) 1980-12-29 1980-12-29 Soft-starting circuit for constant-current power source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18788180A JPS57113123A (en) 1980-12-29 1980-12-29 Soft-starting circuit for constant-current power source

Publications (2)

Publication Number Publication Date
JPS57113123A true JPS57113123A (en) 1982-07-14
JPH0120767B2 JPH0120767B2 (en) 1989-04-18

Family

ID=16213830

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18788180A Granted JPS57113123A (en) 1980-12-29 1980-12-29 Soft-starting circuit for constant-current power source

Country Status (1)

Country Link
JP (1) JPS57113123A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010244704A (en) * 2009-04-01 2010-10-28 Ichikoh Ind Ltd Circuit for lighting vehicular lighting fixture
JP2011067025A (en) * 2009-09-17 2011-03-31 Seiko Instruments Inc Dc-dc converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010244704A (en) * 2009-04-01 2010-10-28 Ichikoh Ind Ltd Circuit for lighting vehicular lighting fixture
JP2011067025A (en) * 2009-09-17 2011-03-31 Seiko Instruments Inc Dc-dc converter
CN102025273A (en) * 2009-09-17 2011-04-20 精工电子有限公司 Dc-dc converter

Also Published As

Publication number Publication date
JPH0120767B2 (en) 1989-04-18

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