GB1131953A - Static frequency changer - Google Patents

Static frequency changer

Info

Publication number
GB1131953A
GB1131953A GB645566A GB645566A GB1131953A GB 1131953 A GB1131953 A GB 1131953A GB 645566 A GB645566 A GB 645566A GB 645566 A GB645566 A GB 645566A GB 1131953 A GB1131953 A GB 1131953A
Authority
GB
United Kingdom
Prior art keywords
thyristor
shut
inverter
capacitor
frequency
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
GB645566A
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.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Original Assignee
Brown Boveri und Cie AG Switzerland
BBC Brown Boveri France SA
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 Brown Boveri und Cie AG Switzerland, BBC Brown Boveri France SA filed Critical Brown Boveri und Cie AG Switzerland
Publication of GB1131953A publication Critical patent/GB1131953A/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
    • H02M5/40—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 with intermediate conversion into dc
    • H02M5/42—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 with intermediate conversion into dc by static converters
    • H02M5/44—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/443—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/45—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • 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
    • H02M5/40—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 with intermediate conversion into dc
    • H02M5/42—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 with intermediate conversion into dc by static converters
    • H02M5/44—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/505—Conversion of dc power input into ac power output without possibility of reversal 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
    • H02M7/515—Conversion of dc power input into ac power output without possibility of reversal 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
    • H02M7/523—Conversion of dc power input into ac power output without possibility of reversal 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 LC-resonance circuit in the main circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

1,131,953. Frequency changing, control of A.C. motors. BROWN, BOVERI & CO. Ltd. 14 Feb., 1966 [16 Feb., 1965; 13 April, 1965], No. 6455/66. Headings H2F and H2J. In a polyphase frequency changer of the rectifier-inverter type for supplying a variable frequency to an induction rotor at least some of the inverter elements 1-6 are shunted by a shut-off circuit comprising a saturable reactor 31 and a capacitor 11 to ensure a controlled conduction time for these elements, and reverse diodes 21-26 and series chokes 8 are included in the circuit. As shown the inverter half of a frequency changer comprises a bridge of thyristors 1-6 each shunted by a reverse current diode 21-26 and a shut-off circuit 11, 31 etc., the inverter feeding a motor 7. In operation prior to the firing of thyristor 1, its associated capacitor 11 is charged from the thyristor 4 saturating the reactor 31 against the direction of any bias applied thereto. On firing thyristor 1 the capacitor discharges through it and in so doing reverses the magnetization of the reactor, the time taken being dependent on the level of the bias. At the end of the discharge the capacitor tends to become reversely charged, thereby applying a reverse voltage to shut off the thyristor 1. Thyristor 3 is subsequently fired. The inductor/capacitor shut-off circuitry may be applied to only one half of the bridge, the other half being provided with conventional commutating capacitors. The voltage pulses applied to the motor arise during the overlap period when thyristors in each half of the bridge conduct together, i.e. on the period between the firing of thyristor 2 say and the shut-off of thyristor 1. It is desirable to keep these pulses constant with varying inverter frequency to obtain a constant motor flux. To achieve this the conduction period of the thyristors such as 1 is made to vary with the inverter frequency by adjusting the bias applied to the saturable reactor. This biasing current may be obtained from the motor terminals via a rectifier. Modified forms of the shut-off circuits which utilize common components are disclosed (Figs. 3 and 4, not shown).
GB645566A 1965-02-16 1966-02-14 Static frequency changer Expired GB1131953A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH225465A CH428867A (en) 1965-02-16 1965-02-16 Static frequency converter for speed-controlled three-phase motors
CH537865A CH419299A (en) 1965-02-16 1965-04-13 Static frequency converter for speed control of three-phase motors

Publications (1)

Publication Number Publication Date
GB1131953A true GB1131953A (en) 1968-10-30

Family

ID=25689923

Family Applications (1)

Application Number Title Priority Date Filing Date
GB645566A Expired GB1131953A (en) 1965-02-16 1966-02-14 Static frequency changer

Country Status (7)

Country Link
AT (1) AT257745B (en)
BE (1) BE676464A (en)
CH (2) CH428867A (en)
DE (1) DE1538270A1 (en)
GB (1) GB1131953A (en)
NL (1) NL6601879A (en)
SE (1) SE303547B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3219050A1 (en) * 1982-05-21 1983-11-24 Brown, Boveri & Cie Ag, 6800 Mannheim Frequency converter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917620B2 (en) * 1977-02-16 1984-04-23 株式会社日立製作所 Inverter protection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3219050A1 (en) * 1982-05-21 1983-11-24 Brown, Boveri & Cie Ag, 6800 Mannheim Frequency converter

Also Published As

Publication number Publication date
DE1538270A1 (en) 1969-04-10
NL6601879A (en) 1966-08-17
BE676464A (en) 1966-06-16
CH419299A (en) 1966-08-31
SE303547B (en) 1968-09-02
AT257745B (en) 1967-10-25
CH428867A (en) 1967-01-31

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