JPS5771008A - Soft-start circuit - Google Patents

Soft-start circuit

Info

Publication number
JPS5771008A
JPS5771008A JP14778580A JP14778580A JPS5771008A JP S5771008 A JPS5771008 A JP S5771008A JP 14778580 A JP14778580 A JP 14778580A JP 14778580 A JP14778580 A JP 14778580A JP S5771008 A JPS5771008 A JP S5771008A
Authority
JP
Japan
Prior art keywords
voltage
charged
soft
value
time
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.)
Pending
Application number
JP14778580A
Other languages
Japanese (ja)
Inventor
Shigeru Shinohara
Tamotsu Ohara
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.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki Co 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 Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Priority to JP14778580A priority Critical patent/JPS5771008A/en
Publication of JPS5771008A publication Critical patent/JPS5771008A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Program-control systems
    • G05B19/02—Program-control systems electric
    • G05B19/04—Program control other than numerical control, i.e. in sequence controllers or logic controllers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Power Conversion In General (AREA)

Abstract

PURPOSE:To perform soft-start operation right after the closure of a start switch by making a control voltage rise rapidly up to a prescribed level and the rise slowly. CONSTITUTION:When a start switch 2a is closed to open a discharge switch 2b coupling with it, the time-lag capacitor C13 of a soft-start signal generating circuit 30 is charged rapidly through voltage-dividing resistances 31 and 32 and a control voltage Vc rises up to a constant voltage Vo. Then, the C13 is charged slowly through a time-lag resistance 12. The phase control C20 of a relaxation oscillator 7, on the other hand, is charged with a time constant determined by resistances 14 and 15, the emitter-collector resistance value of a transistor TR18, and the value of the C20 and when the C20 has a prescribed level value, a PUT21 turns on to send a trigger signal from a pulse transformer 22, turning on a triac 4. The emitter- collector resistance of the TR18 varies with the voltage Vc to vary the charge time constant of the C20, and consequently the conduction phase of the PTU21 is varied to increase the conduction angle of the triac 4 from 0 to the voltage Vc.
JP14778580A 1980-10-21 1980-10-21 Soft-start circuit Pending JPS5771008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14778580A JPS5771008A (en) 1980-10-21 1980-10-21 Soft-start circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14778580A JPS5771008A (en) 1980-10-21 1980-10-21 Soft-start circuit

Publications (1)

Publication Number Publication Date
JPS5771008A true JPS5771008A (en) 1982-05-01

Family

ID=15438136

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14778580A Pending JPS5771008A (en) 1980-10-21 1980-10-21 Soft-start circuit

Country Status (1)

Country Link
JP (1) JPS5771008A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49847B1 (en) * 1970-05-06 1974-01-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49847B1 (en) * 1970-05-06 1974-01-10

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