FR2249477A1 - Electronic 'kick-start' circuit for A.C. loads - is used to enable loads to be driven with low-power setting - Google Patents

Electronic 'kick-start' circuit for A.C. loads - is used to enable loads to be driven with low-power setting

Info

Publication number
FR2249477A1
FR2249477A1 FR7435797A FR7435797A FR2249477A1 FR 2249477 A1 FR2249477 A1 FR 2249477A1 FR 7435797 A FR7435797 A FR 7435797A FR 7435797 A FR7435797 A FR 7435797A FR 2249477 A1 FR2249477 A1 FR 2249477A1
Authority
FR
France
Prior art keywords
loads
capacitor
triac
thyristor
circuit
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.)
Withdrawn
Application number
FR7435797A
Other languages
French (fr)
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.)
Fisons Ltd
Original Assignee
Fisons 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 Fisons Ltd filed Critical Fisons Ltd
Publication of FR2249477A1 publication Critical patent/FR2249477A1/en
Withdrawn legal-status Critical Current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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/257—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/2573—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Multiple Motors (AREA)
  • Power Conversion In General (AREA)

Abstract

When thyristor and triac speed controllers for motors are switched on with a low setting the current drawn may be below the hold current of the semiconductor. To avoid adjustment to start the load a by-pass circuit is used. The thyristor/triac may have an unijunction transistor and a capacitor, or a diac and capacitor firing components with a control potentiometer. The by-pass is a capacitor in series with a diode, in parallel with another capacitor and diode in the opposite direction connected across the thyristor/triac. Both of the capacitors have parallel discharge resistors. When the mains is connected a heavy full-wave current is drawn through the load until the capacitors are charged.
FR7435797A 1973-10-26 1974-10-25 Electronic 'kick-start' circuit for A.C. loads - is used to enable loads to be driven with low-power setting Withdrawn FR2249477A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4986773 1973-10-26

Publications (1)

Publication Number Publication Date
FR2249477A1 true FR2249477A1 (en) 1975-05-23

Family

ID=10453826

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7435797A Withdrawn FR2249477A1 (en) 1973-10-26 1974-10-25 Electronic 'kick-start' circuit for A.C. loads - is used to enable loads to be driven with low-power setting

Country Status (2)

Country Link
DE (1) DE2450014A1 (en)
FR (1) FR2249477A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2783981A1 (en) * 1998-09-29 2000-03-31 St Microelectronics Sa CONTROL CIRCUIT FOR A LOAD TO BE SUPPLIED BY AN ALTERNATIVE VOLTAGE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2783981A1 (en) * 1998-09-29 2000-03-31 St Microelectronics Sa CONTROL CIRCUIT FOR A LOAD TO BE SUPPLIED BY AN ALTERNATIVE VOLTAGE
WO2000019778A1 (en) * 1998-09-29 2000-04-06 Stmicroelectronics S.A. Circuit for controlling a load to be supplied by an alternating current voltage
US6573674B1 (en) 1998-09-29 2003-06-03 Stmicroelectronics S.A. Circuit for controlling a load to be supplied by an alternating current voltage

Also Published As

Publication number Publication date
DE2450014A1 (en) 1975-04-30

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Legal Events

Date Code Title Description
ST Notification of lapse