SE521940C2 - Arrangement for power control of an electrical load - Google Patents
Arrangement for power control of an electrical loadInfo
- Publication number
- SE521940C2 SE521940C2 SE9901715A SE9901715A SE521940C2 SE 521940 C2 SE521940 C2 SE 521940C2 SE 9901715 A SE9901715 A SE 9901715A SE 9901715 A SE9901715 A SE 9901715A SE 521940 C2 SE521940 C2 SE 521940C2
- Authority
- SE
- Sweden
- Prior art keywords
- power
- circuit
- circuit according
- power control
- power transistors
- Prior art date
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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
- H03K17/0814—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit
- H03K17/08148—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit in composite switches
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
annan øøa-4 521 2 Detta syfte och andra uppnås genom en effektregleringskrets innefattande drivsteg, vilka kan vara anslutna till exempelvis ett trefasnät för att släppa igenom nätspänning till en elek- trisk last under styrning av en effektreglerande signal, sär- skilt en pulsbreddmodulerad signal, där varje drivsteg innefat- tar en effektkrets som företrädesvis innefattar en bryggkoppling av två parallellt eller antiparallellt kopplade effekttransisto- rer, som kan vara seriekopplade med varsin spärrdiod, där en kondensator kopplad mellan emitter och kollektor på effekttran- sistorerna, så att falltiden efter det att en transistor stängts förlängs och att övertonsalstringen därigenom reduceras. This object and others are achieved by a power control circuit comprising drive stages, which may be connected to, for example, a three-phase mains to transmit mains voltage to an electric load under the control of a power control signal, in particular a pulse width modulated signal, wherein each drive stage comprises a power circuit which preferably comprises a bridge connection of two power transistors connected in parallel or antiparallel, which may be connected in series with a blocking diode each, where a capacitor is connected between emitter and collector of the power transistors, so that after a transistor closed is extended and the harmonic generation is thereby reduced.
Figurbeskrivning.Figure description.
Utföringsexempel av uppfinningen skall nu beskrivas närmare nedan med hänvisning till bifogade ritningar, på vilka fig. 1 visar en översiktsbild över en kretslösning avsedd att användas för effektstyrning av resistiva, kapacitiva och induk- tiva laster, fig. 2 visar en ytterligare modifikation av en kretslösning avsedd att användas för effektstyrning av resistiva och indukti- va laster, fig. 3 visar ännu en modifikation av en kretslösning avsedd att användas för effektstyrning av resistiva och induktiva laster, fig. 4 visar ännu en modifikation av en kretslösning avsedd att användas för effektstyrning av resistiva och induktiva laster, fig. Sa - Sf visar kopplingsarrangemang vid effekttransisto- rer med tillhörande vågformer.Exemplary embodiments of the invention will now be described in more detail below with reference to the accompanying drawings, in which Fig. 1 shows an overview of a circuit solution intended for use in power control of resistive, capacitive and inductive loads, Fig. 2 shows a further modification of a circuit solution intended to be used for power control of resistive and inductive loads, Fig. 3 shows another modification of a circuit solution intended to be used for power control of resistive and inductive loads, Fig. 4 shows another modification of a circuit solution intended to be used for power control of resistive and inductive loads, Fig. Sa - Sf shows switching arrangements for power transistors with associated waveforms.
Föredragna utföringsformer.Preferred embodiments.
I fig. 1 visas en krets för effektreglering av en elektrisk last. Kretsen enligt fig. 1 är uppbyggd i enlighet med lärorna i den internationella patentansökan WO 95/06353. I fig. 2 - 4 visas modifieringar av kretsen i fig. 1, även dessa i enlighet med den internationella patentansökan WO 95/06353.Fig. 1 shows a circuit for power control of an electric load. The circuit of Fig. 1 is constructed in accordance with the teachings of International Patent Application WO 95/06353. Figures 2-4 show modifications of the circuit of Figure 1, also in accordance with International Patent Application WO 95/06353.
Ett problem med de effektregleringskretsar som beskrivs i WO za»=a 1.1.1; 521 3 95/06353 är att dessa alstrar en relativt stor mängd övertoner.A problem with the power control circuits described in WO za »= a 1.1.1; 521 3 95/06353 is that these generate a relatively large amount of harmonics.
Detta problem löses genom att ansluta en kondensator kopplad mellan emitter och kollektor på de antiparallellt kopplade effekttransistorerna 70 och 72, så att falltiden efter det att en transistor stängts förlängs och att övertonsalstringen därigenom reduceras.This problem is solved by connecting a capacitor connected between emitter and collector to the antiparallally connected power transistors 70 and 72, so that the falling time after a transistor is closed is extended and the harmonic generation is thereby reduced.
I fig Sa - 5f visas kodensatorer 702, 703 och 704 anslutna till effekt transistorerna 70 resp. 72 för att erhålla en sådan övertonsreduktion samt de vågformer som erhålls vid de olika kopplingsarrangemangen.Figs. Sa - 5f show coders 702, 703 and 704 connected to the power transistors 70 and 70, respectively. 72 to obtain such a harmonic reduction as well as the waveforms obtained in the various switching arrangements.
Genom att såsom visas i fig. Sa ansluta en kondensator 702 mellan emitter och kollektor på effekttransistorn 70, 72 erhålls en lång falltid efter det att transistorn stängt, vilket i sin tur motverkar uppkomsten av övertoner. Detta framgår av de motsvarande vågformer som visas i fig. Sb.By connecting a capacitor 702 between emitter and collector to the power transistor 70, 72 as shown in Fig. 5a, a long drop time is obtained after the transistor is closed, which in turn counteracts the occurrence of harmonics. This is evident from the corresponding waveforms shown in Fig. Sb.
Genom att, såsom visas i fig. 5c, ansluta en kondensator 704 i serie med effekttransistorn 70, 72 erhålls en lägre amplitud i vågformen. Detta har i sin tur visat sig ge en väsentligt minskad variation i strömmen genom lasten relativt en ideal vågform. Detta är särskilt fördelaktigt vid stor effektreducering, varför, då effektregleringen skall ske över ett stort område, kondensatorn 704 kan vara i och urkopplingsbar eller ha en variabel kapacitans som styrs i beroende av den önskade effekt reduceringen. Motsvarande vågformer visas i fig.By connecting a capacitor 704 in series with the power transistor 70, 72, as shown in Fig. 5c, a lower amplitude in the waveform is obtained. This in turn has been found to give a significantly reduced variation in the current through the load relative to an ideal waveform. This is particularly advantageous in the case of large power reduction, why, when the power control is to take place over a large area, the capacitor 704 can be in and disconnectable or have a variable capacitance which is controlled depending on the desired power reduction. Corresponding waveforms are shown in FIG.
Sd.Sd.
I fig. Se visas kondensatorerna 702 och 704 inkopplade i ett arrangemang med två anti parallellt kopplade effekttransistorer, varvid även en kondensator 703 har anslutits över transistorn 72. Motsvarande vågformer visas i fig. Sf.Fig. Se shows the capacitors 702 and 704 connected in an arrangement with two anti-parallel power transistors, a capacitor 703 also being connected across the transistor 72. Corresponding waveforms are shown in Fig. Sf.
Lämpliga kondensatorer att använda i dessa tillämpningar är kondensatorer som tål höga spänningar och som vidare tål växelspänning. Lämpliga värden kan vara 1 - 100 mikrofarad.Suitable capacitors to use in these applications are capacitors that can withstand high voltages and that can also withstand alternating voltage. Suitable values can be 1 - 100 microfarads.
Claims (6)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9901715A SE521940C2 (en) | 1999-05-11 | 1999-05-11 | Arrangement for power control of an electrical load |
PCT/SE2000/000928 WO2000069054A1 (en) | 1999-05-11 | 2000-05-10 | Power converting circuit with reduced harmonic content |
AU49640/00A AU4964000A (en) | 1999-05-11 | 2000-05-10 | Power converting circuit with reduced harmonic content |
EP00931821A EP1201022A1 (en) | 1999-05-11 | 2000-05-10 | Power converting circuit with reduced harmonic content |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9901715A SE521940C2 (en) | 1999-05-11 | 1999-05-11 | Arrangement for power control of an electrical load |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9901715D0 SE9901715D0 (en) | 1999-05-11 |
SE9901715L SE9901715L (en) | 2000-11-12 |
SE521940C2 true SE521940C2 (en) | 2003-12-23 |
Family
ID=20415555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9901715A SE521940C2 (en) | 1999-05-11 | 1999-05-11 | Arrangement for power control of an electrical load |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1201022A1 (en) |
AU (1) | AU4964000A (en) |
SE (1) | SE521940C2 (en) |
WO (1) | WO2000069054A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5214356A (en) * | 1978-12-28 | 1993-05-25 | Nilssen Ole K | Dimmable fluorescent lamp ballast |
GB2168865B (en) * | 1984-12-20 | 1988-11-02 | Stanley Electric Co Ltd | Power source circuit |
US4728866A (en) | 1986-09-08 | 1988-03-01 | Lutron Electronics Co., Inc. | Power control system |
WO1995006353A1 (en) | 1993-08-20 | 1995-03-02 | Wöel Elektronik Hb | Circuit for speed control for a one-phase or three-phase motor |
-
1999
- 1999-05-11 SE SE9901715A patent/SE521940C2/en not_active IP Right Cessation
-
2000
- 2000-05-10 AU AU49640/00A patent/AU4964000A/en not_active Abandoned
- 2000-05-10 EP EP00931821A patent/EP1201022A1/en not_active Withdrawn
- 2000-05-10 WO PCT/SE2000/000928 patent/WO2000069054A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2000069054A1 (en) | 2000-11-16 |
SE9901715D0 (en) | 1999-05-11 |
SE9901715L (en) | 2000-11-12 |
AU4964000A (en) | 2000-11-21 |
EP1201022A1 (en) | 2002-05-02 |
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Legal Events
Date | Code | Title | Description |
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NUG | Patent has lapsed |