ZA716729B - Changing the frequency of a polyphase alternating current supply and apparatus therefor - Google Patents

Changing the frequency of a polyphase alternating current supply and apparatus therefor

Info

Publication number
ZA716729B
ZA716729B ZA716729A ZA716729A ZA716729B ZA 716729 B ZA716729 B ZA 716729B ZA 716729 A ZA716729 A ZA 716729A ZA 716729 A ZA716729 A ZA 716729A ZA 716729 B ZA716729 B ZA 716729B
Authority
ZA
South Africa
Prior art keywords
changing
frequency
alternating current
current supply
apparatus therefor
Prior art date
Application number
ZA716729A
Other languages
English (en)
Inventor
N Enslin
J Chapman
Original Assignee
Time Modulation 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 Time Modulation Ltd filed Critical Time Modulation Ltd
Priority to ZA716729A priority Critical patent/ZA716729B/xx
Priority to US00290470A priority patent/US3816808A/en
Priority to GB4354072A priority patent/GB1363036A/en
Priority to AU46929/72A priority patent/AU4692972A/en
Priority to DE19722247427 priority patent/DE2247427A1/de
Priority to IT29939/72A priority patent/IT968502B/it
Priority to JP47099105A priority patent/JPS4947846A/ja
Publication of ZA716729B publication Critical patent/ZA716729B/xx

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
    • H02M5/27—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 for conversion of frequency
    • H02M5/271—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 for conversion of frequency from a three phase input voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Ac-Ac Conversion (AREA)
ZA716729A 1971-10-07 1971-10-07 Changing the frequency of a polyphase alternating current supply and apparatus therefor ZA716729B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ZA716729A ZA716729B (en) 1971-10-07 1971-10-07 Changing the frequency of a polyphase alternating current supply and apparatus therefor
US00290470A US3816808A (en) 1971-10-07 1972-09-20 Changing the frequency of a polyphase alternating current supply and apparatus therefor
GB4354072A GB1363036A (en) 1971-10-07 1972-09-20 Changing the frequency of a polyphase alternating current supply and apparatus therefor
AU46929/72A AU4692972A (en) 1971-10-07 1972-09-21 Method and apparatus for changing the frequency of an a.c. supply
DE19722247427 DE2247427A1 (de) 1971-10-07 1972-09-27 Frequenzumformer
IT29939/72A IT968502B (it) 1971-10-07 1972-09-30 Variazione della frequenza di una alimentazione di corrente alterna ta polifase e apparecchio per la sua realizzazione
JP47099105A JPS4947846A (it) 1971-10-07 1972-10-04

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA716729A ZA716729B (en) 1971-10-07 1971-10-07 Changing the frequency of a polyphase alternating current supply and apparatus therefor

Publications (1)

Publication Number Publication Date
ZA716729B true ZA716729B (en) 1973-02-28

Family

ID=25564000

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA716729A ZA716729B (en) 1971-10-07 1971-10-07 Changing the frequency of a polyphase alternating current supply and apparatus therefor

Country Status (7)

Country Link
US (1) US3816808A (it)
JP (1) JPS4947846A (it)
AU (1) AU4692972A (it)
DE (1) DE2247427A1 (it)
GB (1) GB1363036A (it)
IT (1) IT968502B (it)
ZA (1) ZA716729B (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946293A (en) * 1974-09-13 1976-03-23 Conco Inc. Thyristor control system
US4078192A (en) * 1976-06-24 1978-03-07 Pertec Computer Corporation Synthesizer for multiphase waveforms
FR2449360A1 (fr) * 1979-02-13 1980-09-12 Telemecanique Electrique Dispositif de commande d'un montage triphase a thyristors
US4468725A (en) * 1982-06-18 1984-08-28 Texas Instruments Incorporated Direct AC converter for converting a balanced AC polyphase input to an output voltage
US4713744A (en) * 1986-10-28 1987-12-15 Torcon Products, Inc. Fractional frequency converter using zero switching of input frequency halfwaves

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1270136A (en) * 1968-08-15 1972-04-12 Nicholas Charl De Villiers Polyphase alternating current frequency changer
GB1309641A (en) * 1969-10-24 1973-03-14 Secr Defence Cycloconverters
US3703672A (en) * 1970-05-05 1972-11-21 Nat Res Dev Three-phase induction-motor, speed-changing method and control circuit
US3686558A (en) * 1971-01-04 1972-08-22 Ajax Magnethermic Corp Control for frequency converters

Also Published As

Publication number Publication date
AU4692972A (en) 1974-03-28
IT968502B (it) 1974-03-20
GB1363036A (en) 1974-08-14
JPS4947846A (it) 1974-05-09
DE2247427A1 (de) 1973-04-12
US3816808A (en) 1974-06-11

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