GB988359A - Improvements in or relating to frequency changers - Google Patents

Improvements in or relating to frequency changers

Info

Publication number
GB988359A
GB988359A GB1721461A GB1721461A GB988359A GB 988359 A GB988359 A GB 988359A GB 1721461 A GB1721461 A GB 1721461A GB 1721461 A GB1721461 A GB 1721461A GB 988359 A GB988359 A GB 988359A
Authority
GB
United Kingdom
Prior art keywords
windings
transformers
cores
output
phase
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.)
Expired
Application number
GB1721461A
Inventor
Lawrence John Stratton
Keith Mitchell Chirgwin
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.)
Lear Siegler Inc
Original Assignee
Lear Siegler Inc
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 Lear Siegler Inc filed Critical Lear Siegler Inc
Priority to GB1721461A priority Critical patent/GB988359A/en
Publication of GB988359A publication Critical patent/GB988359A/en
Expired 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
    • H02M5/27—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)
  • Ac-Ac Conversion (AREA)
  • Generation Of Surge Voltage And Current (AREA)

Abstract

988,359. Transformers. LEAR SIEGLER Inc. May 11, 1961, No. 17214/61. Heading H1T. [Also in Division H2] A pulse generator (Fig. 2) for a static frequency changer (see Division H2) comprises a set of six saturable transformers 1<SP>1</SP>-6<SP>1</SP> for each half phase of the output supply. The transformers have toroidal cores of square loop material and each has four input windings, for example 50, 51, 52 and 53 and an output winding 54. The cores are saturated in one direction or the other except when the algebraic sum of the ampere turns in the input windings is substantially zero. An output is generated in an output winding only when the associated core switches from one direction of saturation to another. The windings 50 and 60 are connected in series between the phase voltage a<SP>11</SP>, n<SP>11</SP> and the windings 51 and 61 in series between the lines a<SP>1</SP>, c<SP>1</SP> such that the current in the windings 51 and 61 lags 120 degrees behind the current in phase I<SP>1</SP>, 90 degrees of the lag being due to the inductor 67a. The windings 53 and 63 are provided so that one group of rectifiers of the frequency changer do not fire when the other group are conducting and the windings 52 and 62 provide feedback to slightly advance the firing point in order to eliminate commutating overlap. A modified pulse generator (Fig. 6, not shown) has the input windings differently connected, for example the windings 50 and 60 are supplied from phases a<SP>11</SP>, b<SP>11</SP>, c<SP>11</SP> on cores 1 and 2, 3 and 4, 5 and 6 respectively, but operates in a similar manner to the generator described above.
GB1721461A 1961-05-11 1961-05-11 Improvements in or relating to frequency changers Expired GB988359A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1721461A GB988359A (en) 1961-05-11 1961-05-11 Improvements in or relating to frequency changers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1721461A GB988359A (en) 1961-05-11 1961-05-11 Improvements in or relating to frequency changers

Publications (1)

Publication Number Publication Date
GB988359A true GB988359A (en) 1965-04-07

Family

ID=10091232

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1721461A Expired GB988359A (en) 1961-05-11 1961-05-11 Improvements in or relating to frequency changers

Country Status (1)

Country Link
GB (1) GB988359A (en)

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