SE461945B - STROEMKAELLA WITH SINGLE TRANSFORMER WAS SECOND CIRCUIT FORMAT AS A RECONCILIATED RECTIFIER AND DOUBLE TRANSFORMER WHICH SECOND CIRCUIT FORCOMMATED AS CONNECTED RECTIFIER - Google Patents
STROEMKAELLA WITH SINGLE TRANSFORMER WAS SECOND CIRCUIT FORMAT AS A RECONCILIATED RECTIFIER AND DOUBLE TRANSFORMER WHICH SECOND CIRCUIT FORCOMMATED AS CONNECTED RECTIFIERInfo
- Publication number
- SE461945B SE461945B SE8005577A SE8005577A SE461945B SE 461945 B SE461945 B SE 461945B SE 8005577 A SE8005577 A SE 8005577A SE 8005577 A SE8005577 A SE 8005577A SE 461945 B SE461945 B SE 461945B
- Authority
- SE
- Sweden
- Prior art keywords
- current
- primary
- transformer
- rectifier
- winding
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/305—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a thyratron or thyristor type requiring extinguishing means
- H02M3/315—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Television Receiver Circuits (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Description
461 945 2 omkopplaren medelst en resonanskrets på primärsidan. Samtidigt avviker transformatorns primärlindnings polspänning från rek- tangelformen och är sålunda icke lämplig vid en koppling, vilken redan i sig själv åstadkommer kommutering av primäromkopplarens ström. Under kommuteringen får primäromkopplarens ström icke reduceras, varför man måste utveckla en koppling, vilken be- lastar primäromkopplaren endast under dess positiva halvperiod. 461 945 2 switch by means of a resonant circuit on the primary side. At the same time, the pole voltage of the primary winding of the transformer deviates from the shape of the rectangle and is thus not suitable for a connection which already in itself causes commutation of the current of the primary switch. During commutation, the current of the primary switch must not be reduced, which is why it is necessary to develop a connection which loads the primary switch only during its positive half-period.
Avsikten med föreliggande uppfinning är att lösa dessa problem och för återkommande av detta kännetecknas uppfinningen därav, att sekundärkretsen utformats såsom en avstämd likriktare medelst en till sekundärlindningen ansluten kondensator, vars värde valts så, att sekundärlindningens ström genom inverkan av likriktarelementet avbrytes vid en tidpunkt då primärlindningens ström är liten.The object of the present invention is to solve these problems and to repeat this the invention is characterized in that the secondary circuit is designed as a tuned rectifier by means of a capacitor connected to the secondary winding, the value of which is chosen so that the secondary winding current is interrupted by the rectifier element. power is small.
Uppfinningen ska nedan beskrivas närmare i exempelform under hänvisning till bifogade ritningag där fig. l schematiskt visar linjeslutsteget hos en televisions- mottagare med bild- och ljudströmkällor, fig. 2 visar kurvformer som ansluter sig till beskrivningen av fig. l, fig. 3 visar en motsvarande strömkälla med endast en be- lastningskrets, ' fig. 4 visar det mot figur 3 svarande fallet då omkopplings- organet utgöres av en transistor, och fig. 5 visar en koppling för en strömkälla med tvenne växel- vis fungerande omkopplare.The invention will be described in more detail below in exemplary form with reference to the accompanying drawings, in which Fig. 1 schematically shows the line output stage of a television receiver with picture and sound power sources, Fig. 2 shows waveforms which conform to the description of Fig. 1, Fig. 3 shows a Fig. 4 shows the case corresponding to Fig. 3 when the switching means is constituted by a transistor, and Fig. 5 shows a connection for a current source with two alternately functioning switches.
Kopplingen enligt fig. 1 innefattar följande komponenter: M = avskiljningstransformator, D1 = nätlikriktare, Cl = utjämnings- kondensator, SCR1- 2 = primäromkopplare, Nl = transformatorns primärlindning, N2 = transformatorns sekundärlindning, från vilken medelst dioden D3 likriktas audioslutstegets bruksspänning till kondensatorn C2, N3 = bildalstringsdelens matningslindníng, Ll = utjämningsdrossel, C3 = utjämningskondensator.The coupling according to Fig. 1 comprises the following components: M = isolation transformer, D1 = mains rectifier, C1 = equalization capacitor, SCR1-2 = primary switch, N1 = primary winding of the transformer, N2 = secondary winding of the transformer, from which , N3 = supply winding of the imaging part, L1 = equalization choke, C3 = equalization capacitor.
I patentet FI-55278 har visats en koppling för en televi- sionsmottagare, där omkopplaren förverkligats medelst en tran- sistor. På figur 2 anger Ila den av SCRl-D2 bildade primärom- kopplarens ström utan ljudbelastning och Ilb samma ström med ljudbelastning vid en koppling enligt patentet 55278, då om- kopplaren förverkligats medelst en transistor.The patent FI-55278 has shown a connection for a television receiver, where the switch is realized by means of a transistor. In Fig. 2, 11a indicates the current of the primary switch formed by SCR1-D2 without sound load and IIb the same current with sound load at a switch according to patent 55278, when the switch is realized by means of a transistor.
Ul anger ifrågavarande omkopplares spänning, U2 är trans- formatorns sekundärspännins, I; är sekundär-linaningens n; ström 3 461 945 med ljudbelastning och U3 är kondensatorns C2 spänning- Funktionen är-följande: Då primäromkopplaren SCR1 leder, uppträder i spolens Nl poler en från nätet genom Cl likriktad likspänning. Härvid uppträder i terminalerna hos N2 en av trans- formationsförhållandet Nl-N2 bestämd spänning sä, att en posi- tiv spänning uppträder på anoden hos D3. Ifall U2 är större än U3, börjar dioden D3 leda. Härvid kopplas C2 genom N2 till en belastning för N1. Enär mellan N1 och N2 städse finns en kopp- lingsfaktor av någon storlek, vilken är (1, ser N1 såsom belast- ning en seriekoppling av en av kopplingsfaktorn bestämd ströin- duktans och C2:s kapacitans reducerad genom transformationsför- hållandet. Härvid matas sålunda till den seriekopplade L-C ked- jan en stegspänning, varvid i denna kedja uppkommer en sinusström I2. Enär kopplingen sker genom förmedling av dioden D3, kan kret- sen svänga endast under en halvperiod, dvs. energi överföres från primären Nl till kondensatorn C2.U1 indicates the voltage of the switch in question, U2 is the secondary voltage of the transformer, I; is the n of the secondary line; current 3 461 945 with sound load and U3 is the voltage of the capacitor C2- The function is as follows: When the primary switch SCR1 conducts, a DC voltage rectified from the mains by C1 occurs in the coil N1. In this case, a voltage determined by the transformation ratio N1-N2 appears in the terminals of N2 so that a positive voltage appears on the anode of D3. If U2 is larger than U3, diode D3 starts to conduct. In this case, C2 is connected through N2 to a load for N1. Since between N1 and N2 there is always a coupling factor of some size, which is (1, N1 sees as a load a series connection of a current inductance determined by the coupling factor and the capacitance of C2 reduced by the transformation ratio. to the series-connected LC circuit a step voltage, whereby a sine current I2 arises in this chain, since the connection takes place by means of the diode D3, the circuit can oscillate only for half a period, ie energy is transferred from the primary N1 to the capacitor C2.
Härvid växer kondensatorns C2 terminalspänning i enlighet med kurvan U3 på figur 2 under tiden tl-t3. Denna "vågighet" hos U3 filtreras genom ett lågpass LIC3.In this case, the terminal voltage of the capacitor C2 grows in accordance with the curve U3 in Figure 2 during the time t1-t3. This "waviness" of U3 is filtered through a low pass LIC3.
Från kurvan Ila i fig. 2 ses att primäromkopplaren leder under tiden tl-t3, varefter strömmen överföres till parallell- dioden D2 under tiden t3-tu, varefter primäromkopplaren öppnar vid tidpunkten tu. Enär primäromkopplaren här utgöres av en tyristor, bör dess ström vara bruten under den frigöringstid tyristorn kräver.From the curve 11a in Fig. 2 it is seen that the primary switch conducts during the time t1-t3, after which the current is transmitted to the parallel diode D2 during the time t3-tu, after which the primary switch opens at the time tu. Since the primary switch here is a thyristor, its current should be cut off during the release time required by the thyristor.
Denna tid är t3-tu. För att funktionen skall fortsätta utan störningar, bör ljudlindningens N2:s ström bryta senast vid tid- punkten tš. Detta kan lätt åstadkommas genom att C2 väljes lämpligt stor, m.a.o. genom att med N2 och C2 bilda en avstämd sekundärkrets sä, att I2 avbrytes vid tidpunkten t3 eller där- förinnan.This time is t3-tu. In order for the function to continue without interruption, the current of the sound winding N2 should break at the latest at the time tš. This can be easily achieved by selecting a suitably large C2, i.e. by forming with N2 and C2 a tuned secondary circuit so that I2 is interrupted at time t3 or before.
Enär bildbelastningens energiuppladdning även sker då primäromkopplaren leder till ströinduktansen mellan N1- 3, hålles denna laddning konstant ifall primärsidans terminal- spänning hålles konstant. Primärsidans terminalspänning beror på nätspänningen, motstândsförlusten i Nl och bottningsspänningen hos SCR1.Since the energy charge of the image load also takes place when the primary switch leads to the current inductance between N1-3, this charge is kept constant if the terminal voltage of the primary side is kept constant. The terminal voltage of the primary side depends on the mains voltage, the loss of resistance in N1 and the bottom voltage of SCR1.
Nätspänningen hålls väsentligen oförändrad oberoende av ifrågavarande växlingar i ljudbelastningen. Spänningsförlusten hos motståndet i N1 måste hållas låg redan för förhindrande av värmeutveckling, varför denna faktor icke är av betydelse. 461 945 I" Bottningsspänningen hos SCR1 är konstant, enär det är fråga om en tyristor. Sålunda kan strömmen hos N2 växla under tiden tl-t3 utan att bildstorleken förändras. .The mains voltage is kept substantially unchanged regardless of the changes in sound load in question. The voltage loss of the resistor in N1 must be kept low already to prevent heat generation, so this factor is not important. 461 945 I "The bottom voltage of SCR1 is constant, since it is a thyristor. Thus, the current of N2 can change during the time t1-t3 without changing the image size.
I praktiken har man uppmätt värden där ljudbelastningen varierat från noll till två gånger bildbelastningens värden utan störande inverkan på bilden.In practice, values have been measured where the sound load has varied from zero to twice the values of the image load without disturbing the image.
Lösningen enligt uppfinningen kan tillämpas även på andra strömkällor än ett ljudslutsteg vid en televisionsmottagare.The solution according to the invention can also be applied to other power sources than an audio output stage at a television receiver.
Vid det ovan beskrivna fallet inducerar lindningen N3 kommuteringsströmmen för tyristorn SCRI i transformatorns primär- sida. Ifall endast en belastningskrets föreligger, såsom visats på figur 3, konstrueras på känt sätt en separat kommuteringskrets, vilken på figuren bildas av en andra tyristor SCR2 samt en induk- tans L2 och en kondensator Cu. Den avstämda likriktaren enligt uppfinningen erbjuder även i detta fall den anmärkningsvärda fördelen, att tyristorn kan släokas vid låga strömvärden, av vilken anledning kommuteringskretsen blir enkel och billig.In the case described above, the winding N3 induces the commutation current of the thyristor SCRI in the primary side of the transformer. If only one load circuit is present, as shown in Figure 3, a separate commutation circuit is constructed in a known manner, which in the figure is formed by a second thyristor SCR2 and an inductor L2 and a capacitor Cu. The tuned rectifier according to the invention also offers in this case the remarkable advantage that the thyristor can be turned off at low current values, for which reason the commutation circuit becomes simple and cheap.
Fig. H visar motsvarande situation då omkopplaren utgöres av en styrd transistor Tl, dvs det är fråga om en s.k. chopper- strömkälla. Omkopplingsförlusterna kan nu minimeras genom att omkopplingstidpunkten åter avstämmes att ske vid låga transistor- strömmar. Kopplingsögonblicket kan vid behov t.ex. bestämmas medelst en med hjälp av en logisk krets från sekundärkretsen tagen återkoppling så, att transistorns ström vid omkopplings- ögonblicket är väsentligen noll.Fig. H shows the corresponding situation when the switch is constituted by a controlled transistor T1, ie it is a question of a so-called chopper power source. The switching losses can now be minimized by re-tuning the switching time to take place at low transistor currents. The coupling moment can, if necessary, e.g. is determined by means of a feedback taken from the secondary circuit by means of a logic circuit so that the current of the transistor at the moment of switching is substantially zero.
Slutligen har på fig. 5 visats en enligt växelfasprincipen fungerande strömkälla, vilken är avsedd för större effekter, exempelvis för en svetsningsströmkälla. Kopplingen är densamma som ovan, men på primärsidan finns två växelvisstyrda tyristorer SCRl och SCR3 och på sekundärsidan på motsvarande sätt två av- stämda likriktare, vilka har en gemensam, resonansfrekvens be- stämmande kondensator C2.Finally, Fig. 5 shows a current source operating according to the alternating phase principle, which is intended for larger effects, for example for a welding current source. The connection is the same as above, but on the primary side there are two alternately controlled thyristors SCR1 and SCR3 and on the secondary side correspondingly two tuned rectifiers, which have a common, resonant frequency determining capacitor C2.
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI792517A FI60626C (en) | 1979-08-14 | 1979-08-14 | STROEMKAELLA |
Publications (2)
Publication Number | Publication Date |
---|---|
SE8005577L SE8005577L (en) | 1981-02-15 |
SE461945B true SE461945B (en) | 1990-04-09 |
Family
ID=8512826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8005577A SE461945B (en) | 1979-08-14 | 1980-08-06 | STROEMKAELLA WITH SINGLE TRANSFORMER WAS SECOND CIRCUIT FORMAT AS A RECONCILIATED RECTIFIER AND DOUBLE TRANSFORMER WHICH SECOND CIRCUIT FORCOMMATED AS CONNECTED RECTIFIER |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE3030143C2 (en) |
FI (1) | FI60626C (en) |
GB (1) | GB2056794B (en) |
SE (1) | SE461945B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8301263A (en) * | 1983-04-11 | 1984-11-01 | Philips Nv | POWER SUPPLY CIRCUIT. |
FR2569913B1 (en) * | 1984-09-05 | 1986-09-19 | Matra | DIRECT CURRENT TO CURRENT CURRENT CONVERTER |
DE3622986A1 (en) * | 1986-07-09 | 1988-01-21 | Thomson Brandt Gmbh | Switched-mode power supply for producing a plurality of operating voltages which are isolated from the mains |
DE3809341A1 (en) * | 1988-03-19 | 1989-10-05 | Electronic Werke Deutschland | Transformer for a switched-mode power supply |
US4829216A (en) * | 1988-05-16 | 1989-05-09 | Rca Licensing Corporation | SCR regulator for a television apparatus |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1100170B (en) * | 1958-08-09 | 1961-02-23 | Siemens Ag | Device for the operation of fluorescent lamps via a transistor inverter |
DE1279819B (en) * | 1963-06-28 | 1968-10-10 | Siemens Ag | Voltage regulated DC converter |
US4017784A (en) * | 1976-05-17 | 1977-04-12 | Litton Systems, Inc. | DC to DC converter |
FI55278C (en) * | 1977-08-18 | 1979-06-11 | Salora Oy | KOPPLING VID ETT LINJESLUTSTEG I EN TELEVISIONSMOTTAGARE |
DE2749847C2 (en) * | 1977-11-08 | 1988-01-21 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Switching power supply for a radio receiver, in particular a television receiver |
-
1979
- 1979-08-14 FI FI792517A patent/FI60626C/en not_active IP Right Cessation
-
1980
- 1980-08-06 SE SE8005577A patent/SE461945B/en not_active IP Right Cessation
- 1980-08-08 DE DE19803030143 patent/DE3030143C2/en not_active Expired
- 1980-08-08 GB GB8026008A patent/GB2056794B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FI792517A (en) | 1981-02-15 |
DE3030143A1 (en) | 1981-02-26 |
FI60626C (en) | 1982-02-10 |
SE8005577L (en) | 1981-02-15 |
GB2056794B (en) | 1984-02-01 |
DE3030143C2 (en) | 1986-01-16 |
FI60626B (en) | 1981-10-30 |
GB2056794A (en) | 1981-03-18 |
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