SE521940C2 - Arrangement for power control of an electrical load - Google Patents

Arrangement for power control of an electrical load

Info

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
Application number
SE9901715A
Other languages
Swedish (sv)
Other versions
SE9901715D0 (en
SE9901715L (en
Inventor
Gunnar Wiklund
Hans-Aake Olsson
Original Assignee
Woeel Elektronik Ab
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 Woeel Elektronik Ab filed Critical Woeel Elektronik Ab
Priority to SE9901715A priority Critical patent/SE521940C2/en
Publication of SE9901715D0 publication Critical patent/SE9901715D0/en
Priority to PCT/SE2000/000928 priority patent/WO2000069054A1/en
Priority to AU49640/00A priority patent/AU4964000A/en
Priority to EP00931821A priority patent/EP1201022A1/en
Publication of SE9901715L publication Critical patent/SE9901715L/en
Publication of SE521940C2 publication Critical patent/SE521940C2/en

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/12Arrangements for reducing harmonics from ac input or output
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/0814Modifications 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
    • H03K17/08148Modifications 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

In a power control circuit comprising power transistors, a capacitor interconnected between the emitter and the collector of the power transistors is provided, so that the fall time after that a transistor is closed is increased and that the generation of harmonics thereby is reduced.

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)

521 940 Patentkrav. 9521,940 Patent claims. 9 1. Effektregleringskrets innefattande drivsteg som släpper igenom nätspänning till en elektrisk last under styrning av en effektreglerande signal, där varje drivsteg innefattar en effektkrets innefattande minst en effekttransistor, kännetecknad av en kondensator med variabel kapacitans kopplad mellan emitter och kollektor på effekttransistorerna, så att falltiden efter det att en transistor stängts förlängs och att övertonsalstringen därigenom reduceras.Power control circuit comprising drive stages which transmit mains voltage to an electric load under the control of a power regulating signal, each drive stage comprising a power circuit comprising at least one power transistor, characterized by a variable capacitance capacitor connected between emitter and collector of the power transistors. the fact that a transistor is closed is extended and that the harmonic generation is thereby reduced. 2. Krets enligt krav l, kännetecknad av att en kondensator är ansluten i serie med effekttransistorerna.Circuit according to Claim 1, characterized in that a capacitor is connected in series with the power transistors. 3. Krets enligt något av kraven 1 - 2, kännetecknad av att kretsen är anordnad att anslutas till ett trefasnät.Circuit according to one of Claims 1 to 2, characterized in that the circuit is arranged to be connected to a three-phase network. 4. Krets enligt något av kraven 1 - 3, kännetecknad av att den effektreglerande signalen är en pulsbreddmodulerad signal.Circuit according to one of Claims 1 to 3, characterized in that the power regulating signal is a pulse width modulated signal. 5. Krets enligt något av kraven 1 - 4, kännetecknad av att effektkretsen innefattar en bryggkoppling av tvà parallellt eller antiparallellt kopplade effekttransistorer.Circuit according to one of Claims 1 to 4, characterized in that the power circuit comprises a bridge connection of two power transistors connected in parallel or antiparallel. 6. Krets enligt krav 5, kännetecknad av att de parallellt eller antiparallellt kopplade effekttransistorerna är seriekopplade med varsin spärrdiod.Circuit according to Claim 5, characterized in that the power transistors connected in parallel or antiparallel are connected in series with a blocking diode each.
SE9901715A 1999-05-11 1999-05-11 Arrangement for power control of an electrical load SE521940C2 (en)

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)

* Cited by examiner, † Cited by third party
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

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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