NO138232B - THREE-PHASE INVERTER. - Google Patents

THREE-PHASE INVERTER. Download PDF

Info

Publication number
NO138232B
NO138232B NO753340A NO753340A NO138232B NO 138232 B NO138232 B NO 138232B NO 753340 A NO753340 A NO 753340A NO 753340 A NO753340 A NO 753340A NO 138232 B NO138232 B NO 138232B
Authority
NO
Norway
Prior art keywords
output
phase
phase inverter
circuit breaker
oscillator
Prior art date
Application number
NO753340A
Other languages
Norwegian (no)
Other versions
NO138232C (en
NO753340L (en
Inventor
John Frederick Eastham
Original Assignee
Kg Eng Labor 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 Kg Eng Labor Ltd filed Critical Kg Eng Labor Ltd
Publication of NO753340L publication Critical patent/NO753340L/no
Publication of NO138232B publication Critical patent/NO138232B/en
Publication of NO138232C publication Critical patent/NO138232C/en

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
    • H02M7/53—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 triode or transistor type requiring continuous application of a control signal
    • H02M7/537—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5383—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a self-oscillating arrangement
    • H02M7/53846—Control circuits
    • 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
    • H02M7/53—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 triode or transistor type requiring continuous application of a control signal
    • H02M7/537—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • 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
    • H02M7/53—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 triode or transistor type requiring continuous application of a control signal
    • H02M7/537—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
    • 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
    • H02M7/53—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 triode or transistor type requiring continuous application of a control signal
    • H02M7/537—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • General Induction Heating (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Ac-Ac Conversion (AREA)

Description

Den foreliggende oppfinnelse vedrører en trefase-vekselretter. The present invention relates to a three-phase inverter.

Trefase-vekselrettere anvendes for å mate en trefase-belastning fra en likestrømstilførsel,. og belastningen kan f.eks. være en motor. Three-phase inverters are used to feed a three-phase load from a direct current supply. and the load can e.g. be an engine.

I de britiske patenter nr. 1.402.321 og 1.402.322 er det beskrevet et batteridrevet kjøretøy som har en induksjons- In the British patents Nos. 1,402,321 and 1,402,322, a battery-powered vehicle is described which has an induction

motor, som energiseres fra et batteri via en vekselretter, og _ en vekselretter i overensstemmelse med den foreliggende oppfinnelse vil være anvendbar i et slikt system, i hvilket tilfelle induksjonsmotoren må være en trefase-induksjonsmotor. motor, which is energized from a battery via an inverter, and _ an inverter in accordance with the present invention will be applicable in such a system, in which case the induction motor must be a three-phase induction motor.

De flese trefase-vekselrettere anvender seks eller flere hoved-effektbrytere, hvilke brytere enten er tyristorer eller transistorer. Hver hovedeffektbryter krever en tilhørende laveffekt-elektronisk krets, og påliteligheten avtar etter som antallet komponenter øker. Most three-phase inverters use six or more main power switches, which switches are either thyristors or transistors. Each main circuit breaker requires an associated low-power electronic circuit, and reliability decreases as the number of components increases.

Det er et formål ved den foreliggende oppfinnelse å tilveie-bringe trefase-vekselrettere som' anvender relativt få komponenter. It is an aim of the present invention to provide three-phase inverters which use relatively few components.

Ifølge den foreliggende oppfinnelse er det tilveiebragt en trefase-vekselretter som omfatter første, andre og tredje effektbrytere og første, andre og tredje likespenningskilder, hvor den første effektbryteren og den første spenningskilden er koblet i serie mellom første og andre utgangsklemmer, hvor den,andre effektbryteren og. den andre spenningskilden er koblet i serie mellom den andre utgangsklemmen og en tredje utgangsklemme, hvor den tredje effektbryteren og den tredje spennings- . kilden er koblet i serie mellom nevnte tredje og første utgangsklemmer, og hvor første, andre og tredje fri-løpende dioder respektivt er koblet antiparallelt over nevnte første, andre og tredje ef fektbrytere. ■. According to the present invention, a three-phase inverter is provided which comprises first, second and third circuit breakers and first, second and third DC voltage sources, where the first circuit breaker and the first voltage source are connected in series between the first and second output terminals, where the second circuit breaker and. the second voltage source is connected in series between the second output terminal and a third output terminal, where the third circuit breaker and the third voltage- . the source is connected in series between said third and first output terminals, and where first, second and third free-running diodes are respectively connected in anti-parallel across said first, second and third power switches. ■.

Det sistnevnte foretrekkes for å tillate at vekselretteren kan anvendes med en induktiv belastning. The latter is preferred to allow the inverter to be used with an inductive load.

De tre fasene i en trefase-belastning kan.være koblet mellom respektivt første, andre og tredje utgangsklemmer og et nøytralt punkt. Alternativt kan de tre fasene i primæren i en trefase transformator være koblet i serie respektivt med nevnte første, andre og tredje effektbrytere. En slik transformator kan imidlertid være tung og kostbar. The three phases in a three-phase load can be connected between the first, second and third output terminals respectively and a neutral point. Alternatively, the three phases in the primary in a three-phase transformer can be connected in series respectively with said first, second and third circuit breakers. However, such a transformer can be heavy and expensive.

Det foretrekkes at effektbryterne er transistorer. It is preferred that the circuit breakers are transistors.

Det er mulig å anvende tyristorer som effektbrytere, men det er blitt funnet at hvis effektbryterne er tyristorer, vil den tilhørende frakoblingskrets som er nødvendig for hver tyristor hvis belastningen er induktiv, være ganske komplisert. It is possible to use thyristors as circuit breakers, but it has been found that if the circuit breakers are thyristors, the associated decoupling circuit required for each thyristor if the load is inductive will be quite complicated.

Én trefase-vekselretter i overensstemmelse med den foreliggende oppfinnelse vil nå bli beskrevet i eksempels form under hen-visning til vedlagte tegninger,hvor Fig. 1 er et kretsdiagram av vekselretteren med en tilhørende belastning, Fig. 2 og 3 viser tidsdiagram og bølgeformer for vekselretteren under forskjellige tilstander, og One three-phase inverter in accordance with the present invention will now be described in the form of an example with reference to the attached drawings, where Fig. 1 is a circuit diagram of the inverter with an associated load, Figs. 2 and 3 show timing diagrams and waveforms for the inverter under different conditions, and

Fig. 4 viser en styrekrets for vekselretter ifølge fig. 1. Fig. 4 shows a control circuit for inverters according to fig. 1.

I fig. 1 anvender veksleretteren en delta-konfigurasjon, hvor de tre armene i delta'en er angitt med henholdsvis A, B og C. Armen A består av en effektbryter i form a<y>en transistor 1 In fig. 1, the AC rectifier uses a delta configuration, where the three arms of the delta are indicated by A, B and C respectively. Arm A consists of a circuit breaker in the form of a transistor 1

koblet i serie med et batteri 2 mellom utgangsklemmer 3 og 4. En fri-løpende diode 5 er koblet antiparallelt over transistoren 1. connected in series with a battery 2 between output terminals 3 and 4. A free-running diode 5 is connected anti-parallel across the transistor 1.

Armen B består av en effektbryter i form av en effekttransistor 6 som er koblet i serie med et likestrømsbatteri 7 mellom klemmen 4 og en klemme 8 med en fri-løpende diode 9 koblet antiparallelt over effekt-transistoren 6. Armen C består av en effektbryter i form av en transistor 10 koblet i serie med et likestrømsbatteri 11 mellom klemmene 3 og 8 med en fri-løpende diode 12 koblet antiparallelt over effekt-transistoren 10. Man vil se at de korresponderende komponenter i hver arm er koblet på samme måte, dvs. hvis alle transistorene 1, 6 og 10 skulle iede på samme tid, ville de skape en kortslutning rundt delta'en, og at batteriene 2, 7 og 11 er koblet på samme måte, slik at de kan drive en strøm gjennom de til-hørende transistorer. Arm B consists of a circuit breaker in the form of a power transistor 6 which is connected in series with a direct current battery 7 between terminal 4 and a terminal 8 with a free-running diode 9 connected antiparallel across the power transistor 6. Arm C consists of a circuit breaker in form of a transistor 10 connected in series with a direct current battery 11 between terminals 3 and 8 with a free-running diode 12 connected anti-parallel across the power transistor 10. It will be seen that the corresponding components in each arm are connected in the same way, i.e. if all the transistors 1, 6 and 10 were to ied at the same time, they would create a short circuit around the delta, and that the batteries 2, 7 and 11 are connected in the same way, so that they can drive a current through the associated transistors.

En trefase-belastning som angitt med henvisningstallene 13, 14 og 15 er koblet mellom utgangsklemmene 3, 4 og 8 respektivt og et nøytralt punkt 16. A three-phase load as indicated by the reference numbers 13, 14 and 15 is connected between the output terminals 3, 4 and 8 respectively and a neutral point 16.

Man vil se at når transistoren 1 bevirkes til å lede, vil strøm flyte fra den positive klemmen på batteriet 2 gjennom transistoren 1, belastningen 13 og belastningen 14 til den nega-tive klemmen på batteriet 2. Likeledes, når hver av de andre transistorene bevirkes til å lede, energiseres to av fasene i belastningen. To av transistorene kan bevirkes til å lede samtidig, f.eks. transistorene 1 og 6, i hvilket tilfelle alle tre fasene i belastningen vil være samtidig energisert, men alle tre transistorene kan ikke samtidig energiseres, ettersom en kortslutning da vil oppstå. It will be seen that when transistor 1 is made to conduct, current will flow from the positive terminal of battery 2 through transistor 1, load 13 and load 14 to the negative terminal of battery 2. Likewise, when each of the other transistors is made to conduct, two of the phases in the load are energized. Two of the transistors can be made to conduct at the same time, e.g. transistors 1 and 6, in which case all three phases of the load will be simultaneously energized, but all three transistors cannot be simultaneously energized, as a short circuit will then occur.

Under drift er bryterne lukket i like tidslengder i sekvensen ABCA osv. Fig. 2(a) viser bryteroperasjonstidspunktene med During operation, the switches are closed for equal lengths of time in the sequence ABCA etc. Fig. 2(a) shows the switch operation times with

en "PÅ"-tid utgjørende 15% av repetisjonsperioden, og viser bryteperioden for hver av armene A, B og C. Fig. 2(b) viser strømmen som flyter gjennom en av disse armer for en resistiv belastning, og fig. 2(c) viser strømmen som flyter gjennom en av disse armene med en induktiv belastning. Fig. 3 korresponderer generelt med fig. 2, hvor fig. 3(a) viser bryteperiodene for de tre armene, fig. 3(b) viser strømmen an "ON" time constituting 15% of the repetition period, and shows the breaking period for each of arms A, B and C. Fig. 2(b) shows the current flowing through one of these arms for a resistive load, and Fig. 2(c) shows the current flowing through one of these arms with an inductive load. Fig. 3 generally corresponds to fig. 2, where fig. 3(a) shows the breaking periods for the three arms, fig. 3(b) shows the current

gjennom en av disse armene for en resistiv belastning, og fig. through one of these arms for a resistive load, and fig.

3(c) viser strømmen gjennom en av armene for en induktiv belastning. Fig. 3 viser en innkoblingstid p<å>.2/3 av-hele "perioden, som er den maksimalt.mulige lengde ettersom lengre pulser resulterer i en kortslutning, rundt delta'en. 3(c) shows the current through one of the arms for an inductive load. Fig. 3 shows a switch-on time of 2/3 of the full period, which is the maximum possible length as longer pulses result in a short circuit around the delta.

Spenningsstyring kan oppnås på to måter, hvilke kan anvendes sammen. For det første kan pulslengdene varieres mellom to ytterpunkter som angitt i fig. 2 og 3. Imidlertid foretrekkes det at grunnpulslengden settes permanent ved den maksimalt mu-lige som angitt i fig. 3, og bryterne moduleres på og av innenfor grunnmønsteret som angitt i fig. 3. I denne hensikt, som vist i fig. 4, tilveiebringer en enkelt oscillator 20 tre pulsutmatninger som hver består av et PÅ/AV-forhold på 2:1., Voltage control can be achieved in two ways, which can be used together. Firstly, the pulse lengths can be varied between two extremes as indicated in fig. 2 and 3. However, it is preferred that the basic pulse length is set permanently at the maximum possible as indicated in fig. 3, and the switches are modulated on and off within the basic pattern as indicated in fig. 3. To this end, as shown in fig. 4, a single oscillator 20 provides three pulse outputs each consisting of an ON/OFF ratio of 2:1.,

dvs. en "PÅ"-periode på 24 0° innenfor en syklus på 360°. De tre pulstogutmatningene separeres fra hverandre med 120° og mates til korresponderende innganger på portene 21, 22 og 23, ie an "ON" period of 24 0° within a 360° cycle. The three pulse train outputs are separated from each other by 120° and fed to corresponding inputs on ports 21, 22 and 23,

hvis utganger er koblet til basisen på respektive transistorer 1, 6 og 10. Hver av portene 21, 22 og 23 er en OG-port med to innganger, hvis andre inngang mottar utmatningen fra en felles modulator 24 som tilveiebringer en pulsutmatning med relativt høy frekvens, og som har et variabelt pulstast-(mark-space-)forhold. Modulatorutmatningen kan styres ved hjelp av en styrespenning på en ledning 25, og totalfrekvensen på omformerutgangen kan styres av et signal på ledningen 26, whose outputs are connected to the base of respective transistors 1, 6 and 10. Each of gates 21, 22 and 23 is a two-input AND gate, the other input of which receives the output of a common modulator 24 which provides a relatively high frequency pulse output , and which has a variable pulse key (mark-space) ratio. The modulator output can be controlled by means of a control voltage on a line 25, and the total frequency of the converter output can be controlled by a signal on the line 26,

som er koblet til oscillatoren 20, hvilken avgir tre pulstogutmatninger. which is connected to the oscillator 20, which emits three pulse train outputs.

Claims (6)

1. Trefase-vekselretter,karakterisert ved1. Three-phase inverter, characterized by første, andre og tredje effektbrytere (1, 6, 10) og første, andre og tredje likespenningskilder (2, 7, 11), hvor den første effektbryteren (1) og den første likespenningskilden (2) er koblet i serie mellom første og andre utgangsklemmer (3, 4), hvor den andre effektbryteren (6) og den andre spenningskilden (7) er koblet i serie mellom den andre utgangsklemmen (4) og en tredje utgangsklemme (8), hvor den tredje effektbryteren (10) og den tredje spenningskilden (11) er koblet "i serie mellom nevnte tredje og første utgangsklemmer (8, 3), og hvor første, andre og tredje friløpende dioder (5, 9, 12) ér respektivt koblet antiparallelt over nevnte første, andre og tredje effektbryter (1, 6, 10).- first, second and third circuit breakers (1, 6, 10) and first, second and third DC voltage sources (2, 7, 11), where the first circuit breaker (1) and the first DC voltage source (2) are connected in series between the first and second output terminals (3, 4), where the second circuit breaker (6) and the second voltage source (7) are connected in series between the second output terminal (4) and a third output terminal (8), where the third circuit breaker (10) and the third the voltage source (11) is connected in series between said third and first output terminals (8, 3), and where first, second and third free-running diodes (5, 9, 12) are respectively connected antiparallel across said first, second and third circuit breaker ( 1, 6, 10).- 2. Trefase-vekselretter som angitt i krav 1,karakterisert vedat de tre fasene (13, 14, 15) i en trefase-belastning er koblet mellom henholdsvis nevnte første, andre og tredje utgangsklemmer <3, 4, 8) og et nøytralt punkt (16) . 2. Three-phase inverter as specified in claim 1, characterized in that the three phases (13, 14, 15) in a three-phase load are connected between the aforementioned first, second and third output terminals respectively (3, 4, 8) and a neutral point (16). 3. Trefase-vekselretter som angitt i et av kravene 1-2,karakterisert vedat effektbryterne (1, 6, 10) er transistorer. 3. Three-phase inverters as specified in one of claims 1-2, characterized in that the circuit breakers (1, 6, 10) are transistors. 4. Trefase-vekselretter som angitt i krav... 3,karakterisert veden styrekrets for effektbryterne, hvor styrekretsen omfatter en oscillator. (20) anordnet til å frem-bringe første, andre og tredje pulstogutmatninger som er fase-forskjøvet 120°, og som har et PÅ/AV-forhold"~som ikke er større enn 2:1, første, andre og tredje OG-porter (21, 22, 23) med to innganger, hvor de korresponderende innganger for nevnte OG-porter mottar nevnte-første, andre og tredje utmatninger fra oscillatoren (20.),. hvor utmatningene fra nevnte første, andre og tredje OG-porter (21, 22, 23) er. koblet respektivt til basisene på nevnte første, andre og "tredje effekttransis-torer (1, 6, 10), og en modulator (24) anordnet til å frem-bringe et utgangspulstog ved en frekvens som er høy i forhold til frekvensen for utgangspulstogene fra oscillatoren (20), hvor utgangen fra modulatoren (24) er koblet til den andre inn-gangen på hver OG-port. 4. Three-phase inverters as specified in claim... 3, characterized by the control circuit for the circuit breakers, where the control circuit comprises an oscillator. (20) arranged to produce first, second and third pulse train outputs which are phase-shifted by 120°, and which have an ON/OFF ratio of no greater than 2:1, first, second and third AND- gates (21, 22, 23) with two inputs, where the corresponding inputs of said AND gates receive said first, second and third outputs from the oscillator (20), where the outputs of said first, second and third AND gates (21, 22, 23) are connected respectively to the bases of said first, second and third power transistors (1, 6, 10), and a modulator (24) arranged to produce an output pulse train at a frequency which is high in relation to the frequency of the output pulse trains from the oscillator (20), where the output from the modulator (24) is connected to the second input of each AND gate. 5. Trefase-vekselretter som angitt i krav 4,karakterisert vedat pulstast- (mark-space-)forholdet i utmatningen fra modulatoren (24) er variabelt. 5. Three-phase inverter as stated in claim 4, characterized in that the pulse key (mark-space) ratio in the output from the modulator (24) is variable. 6. Trefase-vekselretter som angitt i krav 4 og 5,karakterisert vedat frekvensen for utmatningen fra oscillatoren (20) er variabel.6. Three-phase inverter as stated in claims 4 and 5, characterized in that the frequency of the output from the oscillator (20) is variable.
NO753340A 1975-07-15 1975-10-02 THREE-PHASE INVERTER. NO138232C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29692/75A GB1543581A (en) 1975-07-15 1975-07-15 Three-phase inverter

Publications (3)

Publication Number Publication Date
NO753340L NO753340L (en) 1977-01-18
NO138232B true NO138232B (en) 1978-04-17
NO138232C NO138232C (en) 1978-07-26

Family

ID=10295598

Family Applications (1)

Application Number Title Priority Date Filing Date
NO753340A NO138232C (en) 1975-07-15 1975-10-02 THREE-PHASE INVERTER.

Country Status (22)

Country Link
JP (1) JPS5210515A (en)
AR (1) AR207371A1 (en)
AT (1) AT342712B (en)
BE (1) BE832861A (en)
BR (1) BR7506698A (en)
CA (1) CA1033807A (en)
CH (1) CH586969A5 (en)
DE (1) DE2536626A1 (en)
DK (1) DK364675A (en)
EG (1) EG13428A (en)
ES (1) ES440798A1 (en)
FI (1) FI761222A (en)
FR (1) FR2318529A1 (en)
GB (1) GB1543581A (en)
IE (1) IE42607B1 (en)
IT (1) IT1047975B (en)
LU (1) LU73254A1 (en)
NL (1) NL7510335A (en)
NO (1) NO138232C (en)
SE (1) SE418438B (en)
SU (1) SU637105A3 (en)
ZA (1) ZA755538B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7643733B2 (en) 2007-07-27 2010-01-05 Gm Global Technology Operations, Inc. Control device for driving a brushless DC motor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1513851C3 (en) * 1966-03-31 1975-09-18 Brown, Boveri & Cie Ag, 6800 Mannheim Device for voltage regulation of a converter arrangement for feeding electrical machines
US3681676A (en) * 1971-04-21 1972-08-01 Gen Motors Corp Cycloconverter silicon controlled rectifier gate signal inhibit circuit

Also Published As

Publication number Publication date
ES440798A1 (en) 1977-06-16
LU73254A1 (en) 1976-04-13
CH586969A5 (en) 1977-04-15
ATA646875A (en) 1977-08-15
AU8474175A (en) 1977-03-17
AR207371A1 (en) 1976-09-30
IE42607B1 (en) 1980-09-10
NO138232C (en) 1978-07-26
FR2318529B1 (en) 1981-11-20
AT342712B (en) 1978-04-25
FR2318529A1 (en) 1977-02-11
IT1047975B (en) 1980-10-20
DK364675A (en) 1977-01-16
SE7604638L (en) 1977-01-16
EG13428A (en) 1981-12-31
SE418438B (en) 1981-05-25
NL7510335A (en) 1977-01-18
FI761222A (en) 1977-01-16
ZA755538B (en) 1976-07-28
JPS5210515A (en) 1977-01-26
DE2536626A1 (en) 1977-02-03
IE42607L (en) 1977-01-15
NO753340L (en) 1977-01-18
GB1543581A (en) 1979-04-04
BR7506698A (en) 1977-05-17
BE832861A (en) 1975-12-16
SU637105A3 (en) 1978-12-05
CA1033807A (en) 1978-06-27

Similar Documents

Publication Publication Date Title
US4672520A (en) Current-source power converting apparatus with self-extinction devices
KR910005545A (en) AC / AC Direct Conversion System
US4041368A (en) Three-phase, quasi-square wave VSCF induction generator system
JPS58133037A (en) Power switch circuit
GB1329764A (en) Electrical converter station for high voltage
JPS62503142A (en) Proportional base drive circuit
NO138232B (en) THREE-PHASE INVERTER.
JPS6043748B2 (en) Variable speed constant frequency induction generator device and its control method
FI85635B (en) STATISK VAEXELKOPPLINGSANORDNING FOER DRIVNING / BROMSNING FOER ETT HASTIGHETSREGLERSYSTEM, SOM OMFATTAR ASYNKRONMOTORER, SOM MATAS MED EN VAEXELRIKTARE.
SU587577A1 (en) Self-sustained three-phase inverter
SU1003039A1 (en) Transformer winding taps switching device
SU877757A1 (en) Dc voltage-to-ac voltage converter
SU554600A1 (en) Three phase inverter
SU853758A1 (en) Two-cycle transistorized inverter
RU176542U1 (en) Device for generating control pulses of a diode-thyristor bridge
RU2155365C2 (en) Procedure controlling alternating voltage
SU494831A1 (en) Three phase inverter
SU1200406A1 (en) Device for switching capacitor
SU970624A1 (en) Device for control of three-phase gate-type voltage regulator
SU1128355A1 (en) D.c.voltage converter
SU663066A1 (en) Transistorized inverter control device
SU782126A1 (en) Three-phase thyristorized switching device
SU729784A1 (en) Transistorized inverter
SU813632A1 (en) Parallel integrator
SU1112523A1 (en) Control unit for polyphase bridge rectifier converter