GB1190847A - Electric Inverting Apparatus - Google Patents

Electric Inverting Apparatus

Info

Publication number
GB1190847A
GB1190847A GB1735367A GB1735367A GB1190847A GB 1190847 A GB1190847 A GB 1190847A GB 1735367 A GB1735367 A GB 1735367A GB 1735367 A GB1735367 A GB 1735367A GB 1190847 A GB1190847 A GB 1190847A
Authority
GB
United Kingdom
Prior art keywords
frequency
generator
sine wave
inverter
waveform
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
GB1735367A
Inventor
James Morgan Warrington
Arthur Dennis Hawkins
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.)
English Electric Co Ltd
Original Assignee
English Electric Co 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 English Electric Co Ltd filed Critical English Electric Co Ltd
Priority to GB1735367A priority Critical patent/GB1190847A/en
Publication of GB1190847A publication Critical patent/GB1190847A/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
    • 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
    • H02M7/525—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 automatic control of output waveform or frequency
    • H02M7/527—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 automatic control of output waveform or frequency by pulse width modulation
    • 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
    • H02M7/521—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 in a bridge configuration

Abstract

1,190,847. Inverting; synthesizing sine waves; control of A.C. motors. ENGLISH ELECTRIC CO. Ltd. 10 April, 1968 [14 April, 1967], No. 17353/67. Headings H2F and H2J. Control signals are derived by comparing the instantaneous value of a sine wave with that of a higher frequency triangular wave and operating switching devices where the instantaneous value of one wave exceeds that of the other. The invention is applicable to control of speed of a reluctance type synchronous motor by variation of the frequency of the sine wave, referred to above, and corresponding variation of the frequency of an inverter (Fig. 1, not shown) comprising a three-phase bridge of thyristors having inverse diodes and commutating circuits comprising centre-tapped inductors, bridged thyristors and commutating capacitors. The output of the inverter is pulsewidth modulated in such a way that the effective output is proportional to the frequency. Triggering thyristor inverters.-Fig. 2 shows the generation of trigger pulses for the inverter thyristors. Trigger devices 43 are switched each time the instantaneous value of a constantfrequency triangular waveform 71, Fig. 6, from generator 41 exceeds that of a variable frequency sine wave 72 from generator 38, giving a resulting waveform 73 which is inverted at 46 to give waveform 74, the two waveforms being fed to thyristor control units 45, 47 which provide a train of thyristor firing pulses at each step. The resulting output from the inverter is shown at 75. The motor speed is reduced by reducing the frequency and amplitude of the sine wave 72 from generator 38. This has the effect of altering waveform 73 in such a way that the negative and positive half-cycles of the pulse-width modulated output become more nearly symmetrical so as to reduce the output current as the frequency is reduced. Synthesizing sine waves.-Fig. 3 shows a system suitable for use as generator 38 for providing a variable frequency three-phase sine wave from a variable frequency pulse generator 61. Pulses from 61 are fed to an 18-stage ring counter and to a frequency/voltage converter 63 which biases limiting diodes so that the outputs from the ring counter are proportional to frequency. The outputs of the ring counter are coupled via summing resistors 69 to three integrating amplifiers 66, resistors 69 being weighted so that the outputs from amplifiers 66 are substantially sinusoidal and displaced in phase by 120 degrees and at a frequency determined by a control signal 62 which determines the frequency of the pulse generator 61.
GB1735367A 1967-04-14 1967-04-14 Electric Inverting Apparatus Expired GB1190847A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1735367A GB1190847A (en) 1967-04-14 1967-04-14 Electric Inverting Apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1735367A GB1190847A (en) 1967-04-14 1967-04-14 Electric Inverting Apparatus

Publications (1)

Publication Number Publication Date
GB1190847A true GB1190847A (en) 1970-05-06

Family

ID=10093702

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1735367A Expired GB1190847A (en) 1967-04-14 1967-04-14 Electric Inverting Apparatus

Country Status (1)

Country Link
GB (1) GB1190847A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718853A (en) * 1971-08-16 1973-02-27 Gen Electric Pulse width limiting means for inverter circuits
FR2461401A1 (en) * 1979-07-06 1981-01-30 Alsthom Atlantique Numeric control for three=phase oscillator - is by comparison of numeric sinusoids and of sawtooth waveform
EP0104299A1 (en) * 1982-09-22 1984-04-04 ACEC, Société Anonyme Control method for an inverter working with pulse width modulation, and device for carrying out this method
RU2488938C1 (en) * 2012-03-19 2013-07-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный аграрный университет" Dc voltage to three-phase ac voltage converter on reversible rectifier
RU2534028C1 (en) * 2013-07-19 2014-11-27 Открытое акционерное общество "Федеральный научно-производственный центр "Нижегородский научно-исследовательский институт радиотехники" Power supply source for radar station equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718853A (en) * 1971-08-16 1973-02-27 Gen Electric Pulse width limiting means for inverter circuits
FR2461401A1 (en) * 1979-07-06 1981-01-30 Alsthom Atlantique Numeric control for three=phase oscillator - is by comparison of numeric sinusoids and of sawtooth waveform
EP0104299A1 (en) * 1982-09-22 1984-04-04 ACEC, Société Anonyme Control method for an inverter working with pulse width modulation, and device for carrying out this method
RU2488938C1 (en) * 2012-03-19 2013-07-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный аграрный университет" Dc voltage to three-phase ac voltage converter on reversible rectifier
RU2534028C1 (en) * 2013-07-19 2014-11-27 Открытое акционерное общество "Федеральный научно-производственный центр "Нижегородский научно-исследовательский институт радиотехники" Power supply source for radar station equipment

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed