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GB1395743A - Conversion systems - Google Patents

Conversion systems

Info

Publication number
GB1395743A
GB1395743A GB2343772A GB2343772A GB1395743A GB 1395743 A GB1395743 A GB 1395743A GB 2343772 A GB2343772 A GB 2343772A GB 2343772 A GB2343772 A GB 2343772A GB 1395743 A GB1395743 A GB 1395743A
Authority
GB
United Kingdom
Prior art keywords
frequency
load
diodes
thyristors
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
GB2343772A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1395743A publication Critical patent/GB1395743A/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)
  • Control Of Ac Motors In General (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

1395743 Frequency changers: control of A.C. motors INTERNATIONAL STANDARD ELECTRIC CORP 18 May 1972 [26 May 1971] 23437/72 Headings H2F and H2J A circuit for reducing the frequency of a A.C. supply comprises for the or each phase of the output a first bridge of two diodes D1, D2 and two controlled rectifiers T1, T2 for feeding a first portion UX of a load and a further bridge comprising the said diodes D1, D2 and two further controlled rectifiers T3, T4 for feeding a further portion U<SP>1</SP>, X<SP>1</SP> of the load. The controlled rectifiers are triggered by means which determine the number of half cycles (or part half cycles) of similar polarity to feed the load portions. The load portions UX &c. may be windings of a squirrel-cage motor. In Fig. 10 (not shown) four pairs of thyristors are used in conjunction with a common pair of diodes D1, D2 so as to feed four load portions with a twophase supply derived by reducing the frequency of the single phase input. Fig. 12 (not shown) depicts a block diagram of a control system in which an adjustable frequency generator oprates at twice the required frequency and feeds flip-flops and gates so as to provide appropriate triggering pulses for the respective thyristors. The thyristors may be phase-controlled (Fig. 13, not shown) so that the effective output is proportional to frequency. The motor may be stopped by switching off the controlling frequency generator or reversed by reversal of phase sequence.
GB2343772A 1971-05-26 1972-05-18 Conversion systems Expired GB1395743A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712126189 DE2126189B2 (en) 1971-05-26 1971-05-26 ARRANGEMENT FOR THE FORMING OF AC VOLTAGE SYSTEMS

Publications (1)

Publication Number Publication Date
GB1395743A true GB1395743A (en) 1975-05-29

Family

ID=5809007

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2343772A Expired GB1395743A (en) 1971-05-26 1972-05-18 Conversion systems

Country Status (3)

Country Link
DE (1) DE2126189B2 (en)
FR (1) FR2139139B1 (en)
GB (1) GB1395743A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152774A (en) * 1983-12-12 1985-08-07 Pikrose & Company Limited Controller for induction motors
GB2186751A (en) * 1986-02-14 1987-08-19 Westinghouse Electric Corp Hidden dc-link ac/dc converter using bilateral power switches and motor drive embodying the same
WO1991003869A1 (en) * 1989-09-11 1991-03-21 Boral Johns Perry Industries Pty. Ltd. Variable speed ac drive control
FR2816129A1 (en) * 2000-11-02 2002-05-03 Felix Bernier Control of an alternating current motor with dual armature windings, uses two thyristor bridges, each supplying one of the two windings of the armature, and has the sense of conduction of one bridge inverse to the other
CN115021593A (en) * 2022-08-09 2022-09-06 四川大学 Control method of hybrid rectifier with multi-scale frequency modulation capability

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8600893A (en) * 1986-04-09 1987-11-02 A P M Van Der Veek ELECTRONIC CIRCUITS FOR HALVING THE SPEED OF AC AND ELECTRIC MOTORS.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152774A (en) * 1983-12-12 1985-08-07 Pikrose & Company Limited Controller for induction motors
GB2186751A (en) * 1986-02-14 1987-08-19 Westinghouse Electric Corp Hidden dc-link ac/dc converter using bilateral power switches and motor drive embodying the same
GB2186751B (en) * 1986-02-14 1989-12-06 Westinghouse Electric Corp Ac/ac converter using bilateral power switches and motor drive embodying the same
WO1991003869A1 (en) * 1989-09-11 1991-03-21 Boral Johns Perry Industries Pty. Ltd. Variable speed ac drive control
AU630511B2 (en) * 1989-09-11 1992-10-29 Boral Johns Perry Industries Pty Ltd Variable speed ac drive control
FR2816129A1 (en) * 2000-11-02 2002-05-03 Felix Bernier Control of an alternating current motor with dual armature windings, uses two thyristor bridges, each supplying one of the two windings of the armature, and has the sense of conduction of one bridge inverse to the other
CN115021593A (en) * 2022-08-09 2022-09-06 四川大学 Control method of hybrid rectifier with multi-scale frequency modulation capability
CN115021593B (en) * 2022-08-09 2022-11-01 四川大学 Control method of hybrid rectifier with multi-scale frequency modulation capability

Also Published As

Publication number Publication date
DE2126189B2 (en) 1977-07-07
FR2139139B1 (en) 1977-12-23
FR2139139A1 (en) 1973-01-05
DE2126189A1 (en) 1972-11-30

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee