DE3347372A1 - Stabilised power supply device for television receivers - Google Patents

Abstract

The invention relates to a device for generating the feed voltages for the electrical assemblies of a television receiver. It is the object of the invention to develop a stabilised power supply device with a freely oscillating flyback converter in such a manner that all electrical assemblies and the picture tube of a television receiver are supplied from the rectified mains alternating voltage with as low as possible power conversion losses and additional expenditure for suppressing a modulation of the high tension when using a dynamic east/west raster correction is avoided. This is achieved by the flyback converter transformer being provided with an additional secondary winding which is connected to the acceleration electrode of the picture tube, all windings of the transformer being arranged on one leg of a U-shaped ferrite core in such a manner that the primary storage inductance is placed between the secondary windings for generating the feed voltages for the electrical assemblies and the additional secondary winding, and that windings with numbers of turns which are low in comparison with the width of the winding are wound with such a pitch that they largely enclose the ferrite core over the entire useful winding width, and that the winding voltage induced during the flyback phase is two to three times greater than the winding voltage during the conducting phase of the switching transistor. <IMAGE>

Description

934.7372

Title of the invention

Stabilized power supply for television receivers

Field of application of the invention

The invention relates to a device for generating the supply voltages for the electrical output stages of a television receiver from the rectified emergency alternating voltage, the from a flyback converter with transformer and associated Glciehricliterarrangements exists.

Characteristics of the known technical solutions

It is known that the re-voltage for the supply of the signal, auxiliary and deflection stages including the Iloizung for the Picture tube from the rectified Netzwecksolvoltage over a froi swinging donkey that is independent of the Horizor} tala © lenlcfreciuenz Blocking converter with switching transistor and transformer and subsequent rectifier arrangements · as well as stabilizing devices £ u win. One such power supply device is already in the magazine Funkscitau. 1 ^ 75, ifeft 5, Page · '((), as well as ii: i üatonbuch "Sieiuens Baustuppen"

The disadvantage of this device is that the high voltage for the. Supply of the closing electrode of the cathode ray tube is obtained via a renewed energy conversion, preferably from de; .ι liücklauftransfonuator the iiorizontalablonlcung, whereby the degree of vibration of the irusa;: it arrangement is cluttered. A further disadvantage is that special allowance is a precautionary measure i-incr modulation of the high voltage, as a foIgο oinor for color picture tubes nutwomlißen dynaj-iiscliou Os t-V "; s t-l" orroktur over tion lüie ■ laul 'trans f'orijator erf or borrowed

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js is further i; cLannt, high voltages durcli Spanaungsvervicli'ncliuiit ';, produce i.iit divided Wiclilungen and diodes in series in each case Ku, using as the Ladelcapazitäten jJigon'.apazität the respective Vl cklungsteile be used. Special execution forms are in DE-AS 23 5I and Dii-OS Ζ'Λ 1 '! 9O "and used in connection with the return transformer of the horizontal deflection. Another disadvantage here is that the energy of the primary rice is taken from a stabilized power supply device with additional energy conversion and is accumulated as IUi ei · J. ransTox-iiiator in connection with the horizontal deflection above - ί fills iiösondoro l-iaßnahmon to avoid modulation of the iioc} is |) unnecessary /; as a result of a dynastic ost-l / es t-iias t er! correction is necessary for color picture tubes It is also mentioned (DD-AP 157 287) that high voltage and supply voltage for the deflection are generated together with the help of a ferrous resonance gonor, in which the stabilization of the outlet tension is achieved by saturation of the ferrite emptiness.

Although this arrangement avoids double energy conversion, however, due to the saturation operation of the ferrite core iliion has a relatively low “degree of efficiency, as there is considerable loss in <ioi: i saturated grain oil, as a result of increased or iron losses, (With. Stands. In addition, it is used to control the ferroresonance translator necessary weekly solar power source relatively expensive, (ia lie talrtbotrieu is necessary.

"b ^ iLerhin woison the currently known Ferritinaterialion one .star.: e dependence of the saturation induction on time, see above that the output voltage also depends on the temperature will.

i ^ in a further xachtcil diose arrangement arises from the fact that <li> r input voltage range for which a stable output voltage, ·; is achieved, is relatively low, because on the one hand, in the event of a riiodrange input voltage, the core is insufficiently saturated and on the other hand, if the input voltage is high, the losses iia 'cm very star'; increase, because viol i eats Enorgio in the grain ; es chi «! t is nls ai.i output is compensated.

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Also arises from the settlement operation and the loose coupling between primary and secondary winding there is an increased magnetic field Stray field, which interferes with other Jjaustufen dos television receivers affects and additional measures to magnetic Makes shielding necessary.

Finally, it is generally known to generate the high voltage independently of the horizontal deflection in a separate high-voltage generator with a high-voltage transformer. Here, too , the disadvantage of double energy conversion occurs, without increased effort for the separate generator.

Object of the invention

The aim of the invention is to reduce the energy consumption of a television receiver while reducing the cost of the total power supply of the rAupt ängers.

Explain the essence3 of the invention

The invention is based on the object of a stabilized Power supply device for television receivers, consisting of an input-side rectifier arrangement and a self-oscillating one Flyback converter with switching transistor, control device, control amplifier and Eoferenzquelle, as well as a transformer with primary storage inductance, feedback winding, one the winding supplying the equivalent voltage, several secondary windings with downstream rectifier diodes to generate the supply voltages for all electrical building stages of this type to train that all electrical construction stages and the picture tube of a television receiver from the rectified AC voltage supplied with the lowest possible energy conversion losses and additional effort to suppress a modulation of the high voltage when using a dynamic east ¥ est raster correlation is avoided.

According to the invention this is achieved in that the transformer of the flyback converter contains an additional secondary winding, which is made up of several oinlageigen, known per se, connected by diodes There are partial windings and with the acceleration electrode the picture tube is connected, and that all windings of the transformer on one leg of a U-shaped mold core are arranged so that the primary storage inductance

• .-. Vise:; · η <loti ο u; uii <la rv Lc .luiircii ν.ir. , Vr.nur.un. ·. ·! o> -if <- ^ pnniiiui.-ct) l ~ \ iv ili «. · · 'I -'- · tr i.schen ixTi.s Lu lVn rino :, i-unis ^ .n ..; .- (• _t ., _{1 (; rrs} ' ind i; fr .uaii t.-Ii ciiori 5 <and. ·, Η. "Lc:", inn .;, ili- ·; .. it cii-r; wHciilfUiiif ; un. "Si'L <j:; tro (i ('' .IfT .-, ildnihrr vt-rlanidt-o ist, -.- u li <v; en icom; nt ιπκί dafi windings with in relation:. ur VicIrclbroiU: nicdri (; n: i number of turns on ::; with such a slope fcwic: olt ... are that they use the ferrite grain woitosLgohend over the ^ cstir.i te..an-Vickolbreito lu; is cliließen, and that The induction voltage induced during the blocking phase zvci up to three times / jröOor is than the ¥ itidungsspannun £ j during the loit phase of the switching transistor. This stabilized power supply device iiosit '/. t has the advantage that the high voltage door is the spoiinc the upper electrode of the iile!: electron beam tube is generated by the direct guinwaridlunc with an efficiency that corresponds to dor dor uckatinten Mcdorspannungsversorgunc and additional measures to avoid e The modulation of the high voltage by a necessary ost- ¥ est-ras tor correction is completely enti'allon, since the generation of the high voltage takes place independently of the horizontal deflection. In addition, there is the advantage that a change in the load of the high voltage can no longer affect the pulse shape of the return pulse via the flyback transformer and thus also the screen grid voltage for the picture tube generated therefrom.

Dine sufficient stability in the additional secondary winding generated sound high voltage, mainly depending on the rule-related frequency change of the flyback converter can only be sufficient if this winding is on the one hand a possible fixed coupling to the primary storage inductance and to that which Voltage supplying winding has to effects of natural resonance on the stability of the generated high voltage to be kept low.

On the other hand, the rise time of the voltage in the additional Secondary winding for generating the high voltage be shorter than the duration of the shortest sporr phase of the switching transistor, indoi.i the self-capacitance of the winding remains low.

In an embodiment of the invention, a secondary winding is .uxr Generation of a low output voltage on such a joint dos Kornes arranged on the looser coupling οinο lower Vindenaapannunc is induced and therefore an accurate liinstellunß the target voltage can be achieved.

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.,. nil · ίΐΐκίίΜ · «· Aij.s,.« - ii taJ t mir, sje; JK. > no _; . ir .i.-iJn. ; <· Ι im · <· ίί .. ·· - s (.öri! I) tlon i: iii (; notic <ir ο troul'ddcs d <> s "IVausiur: ΐ · ι tir-i, <. · .-. Air gap ii .. i'nrritl.crn innc.-rha I.> Du. '<From a <.η>. · ΚΙιη ··; .. ί' 1 ■ · ν .s.-n · ... · As negotiations surrounding the Toxics; arranging m-iius If a number Lzgctron-, 'or operational dor 5 troi ivnvsuv: in - \ * <> j for ι <·'.;: is cri'ordorlich, i .önncti clic pi'ii.iiirn üpcicJicrinuu .: t .i ν i. til t., 'Ij.-JUiCJ ₁ -Oj) PlUrIr ₁ SWiC ^ lUIi ₁ '; uiKl the, el io VoJ-, -; loicJi. s .->., nniniii, -, 1 i> -i er;. · i. '>. ic: .. lunf; on the one hand>, u den Solaindärwic.lun /;!.: !!'.: no. /Γ.'-ιμι-,ιιιι ;; ..... Speisespantmn ^ on for the oils ': Irish Viu.stui'on and mui' nr- · soita;: ur additional Sc; .und; irwic ::. lun, ",, dio; .iit dci ' lies cii 1 <cni {; uiifj3nlc; ktrodc the Jildrülir« is connected by sehn Cv. is <> liorunijen to be separated.

Since the realization of a fixed! Loppluti /; the 't.'ic'ü-unr.cn do.s Itansforinators ^ crin ;; e spacings lioclispannuii ^ sführondor Tui 1-wic!; Lunt; on to each other to Folfje li.at, ns is necessary, the, -. i · - sai.-ito winding arrangement with scliwoi'ontflai; iini> arcii.i! 'unstJiaivi.: u drink b :: w. to luxury pens.

It is often desirable, one by the internal resistance de iiochspannungsquelle conditional s tx ^ Ahls ti "o; iiauliängigo iJildf or;.! To compensate .ia t change this can dadurc easily voise done that a las tabhäingige LJeeinf lussung dor output voltages of Flyback converter and thus also the Spoisospannun .. for the horizontal deflection is achieved, inde.n in series with., The charging circuit of the comparison voltage or'generating a dofiniort.er resistor is arranged so that the beam current-dependent image width in Lmg reaches a minimum. This has the advantage that Since with the conception according to the invention in the event of the failure of the horizontal deflection the accelerating voltage of the lildrölire can be maintained, it is additionally necessary to generate the opening for the dildo from the horizontal deflection of the horizontal deflection In this way, the dildo tube is opened in the event of failure ll the horizon taiaulon! Un ₁ -. durriol controlled so that a unu. </, e len ': t er jJli. ·; L beam diu LouciitscliirliL <lcs JJildscliir..ios nichL .: i-sf; nii «Ii, -oi

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0347372

The end! 'ühi'ungsoobeispiel

The invention will be based on an Ausführungsbeispie1 are explained in more detail. The accompanying drawings show: FIG. 1: the circuit diagram or a power supply device according to the invention

FLr, - 2: oinc schematic representation of the arrangement of the Vicklungon of the Sperrwamllortrarisf oruators of the invented power supply device

In Figure 1, the line voltage is uit the help of the rectifier arrangement 1 rectified and serves as the supply voltage for the entire power supply device.

The switching transistor 2 in connection with the control device Ί and a liückkopplungswicklungs k have in known Veis ο the task of periodically switching the primary winding 5 of the converter transformer 6 to the supply voltage on and off, with a saw tooth shape in the primary winding during the Loitphaso of the switching transistor 2 increasing current flows. The Verßloichswici, J.ung 7 serves the defined influencing of the switch-off point of the switching transistor 2 in the sense of a stabilization of the output voltages in connection with a cone amplifier and a supply source.

The secondary windings 8/9 and 10 are used in a scanned manner to generate low operating voltages to feed the electrical components or the picture tube heating of a television receiver. Their structural design differs jodoch significantly from the known Sperrwandlortransfornatoren from, uu ensure that the additional secondary winding 11, the single-layer iiiehrcren out, composed by diode-connected part windings, on the one hand a fixed possible head * lung aufxveist ^{to the} other Wicklungon and anderere el && a solcho rise time reached their voltage, which is shorter than the shortest duration of the blocking phase of the switching transformer 2, so that their Üigenresonani ". has no significant influence on the stability of the generated acceleration voltage U ₁₁ in the event of a frequency deviation of the blocking converter caused by frequency.

On the one hand, to generate the high voltage in the additional Sokundärwicl ment .1 1 as high a voltage as possible is required in order to achieve with the lowest possible number of turns flowing mechanical dimensions of the coil 11 , thus both

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A firm coupling with the windings fj / 7 / '" ^{1 a} l ^s also a low capacity is achieved. On the other hand, an optimal efficiency for the use of the low supply voltages is a' Past ratio between the Loit and blocking phase 1: 1 as possible Taking into account that both windings for generating low supply voltages and a winding for generating a DC voltage that is at least two orders of magnitude higher are arranged together in a fixed coupling on a ferrite core, optimum efficiency is achieved when the ratio of the turns The voltage from the blocking phase to the conductive phase is between 2 and 13. The focusing voltage for the picture tube can be taken from a tap on the additional secondary winding 11 connected by means of several single-layer diodes. Another possibility is to connect a resistance divider 12/13/1 ^ to the output for the acceleration voltage U. of the picture tube, the tap of which is connected to the film electrode and that at least its high-voltage-side partial resistance \ k together with the total The winding and the diodes are cast in synthetic resin.

Often it is desirable to have an "opposition" from the inside Hole voltage source conditional beam tr omao-dependent liildf or ^ iate change to compensate. This' tanii in a simple ¥ oise thereby take place that a load-dependent influence on the output voltages of the flyback converter and thus also the supply voltage for the HK output stage 15 is achieved by connecting the charging circuit in series 16/17 of the comparison voltage generation a defined Resistor 18 is arranged.

This has the advantage that the compensation means that there are no additional Losses occur.

Since in the inventive concept oei failure of the horizontal deflection 15 the accelerating voltage of the picture tube can continue to be maintained, it is to protect the Picture tube appropriate, the screen grid voltage for the picture tube I9 from the return pulses of the IJK output stages via a To produce rectifier arrangement 20/21.

In this way, the picture tube is darkly controlled if the horizontal deflection fails and an undeflected electron beam is prevented from burning in.

ORIGINAL INSPECTED C0PY

To reduce the disturbing stray field of the flyback converter 6 it is useful to arrange the air gap 22 in the ferrite core of the converter transformer 6 within the part of the core which is surrounded by windings with a continuous flow. In Figure 2, the arrangement of the windings on the ferrite! .Orn is darges mad. The winding fi for the üraeugunc a low supply voltage for supplying the electrical 13ausfcufen of the? Crnsclicinpfangers, except for the supply of the iiorixontalaulon! If several windings are necessary, these are occasionally wound into one another as multi-filament windings with the same pitch in order to keep the winding height as small as possible. In another embodiment, these windings can also consist of strips of film which are wound next to one another in a helical manner and the coil body.

In the following position, the winding 9 ² ^ r supply dfr horizontal deflection stage 15 is also arranged distributed over the gesainto Wickolbroito. The first protective insulation 23 is located on this. Immediately on the protective insulation are the gap coupling winding k and the pre-matching winding 7 as a two-thread winding with a pitch such that the entire winding width is used.

Immediately thereafter, the primary winding 5 is arranged so that they have an equally firm coupling on the one hand to. Winding 9 for supplying the horizontal deflection stage I5 and the pre-equalization winding 7 and on the other hand to the additional secondary winding 11 connected by several single-layer diodes. The diodes are arranged on the circumference of the winding and are cast together with it in synthetic resin. The additional secondary winding 11 is wound onto a second bobbin, which at the same time represents the second protective insulation Zh .

Since, due to the high winding voltage, a more precise setting of particularly low supply voltages is not readily niög, in a further embodiment the winding 10 for supplying the heating of the picture tube can be arranged on such a cleat of the core on which a low-voltage voltage is created by a defined looser coupling A defined level of tension is induced and spi.it can then be achieved.

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Claims (1)

Liability claim (T) Stabilized power supply for television receivers, consisting of an input-side rectifier arrangement and a self-oscillating flyback converter with switching transistor, control device, control amplifier and reference source, as well as a Transformer with primary storage inductance, feedback winding, one winding that supplies the comparison voltage, one or more secondary windings with downstream rectifier diodes to generate the supply voltages for all electrical construction stages of a television receiver, characterized in that the transformer (6) of the flyback converter has an additional Secondary winding (11) contains, which are known from per se, consists of several single-layer windings connected by diodes and with the accelerating electrode of the picture tube. (19) is connected, and that all the windings of the transformer (6) are arranged on one leg of a U-shaped ferrite core are that the primary storage inductance (5) between the secondary windings (8,9) to generate the supply voltages for the electrical construction stages of a television receiver and the additional secondary winding (11) connected to the acceleration electrode the picture tube (19) is connected, comes to rest, and that windings with a low number of turns in relation to the winding width are wound with such a pitch that they largely remove the ferrite core enclose over the entire usable winding width, and that the winding voltage induced during the blocking phase is two to three times greater than the winding voltage during the conducting phase of the switching transistor (2). Stabilized power supply device according to point 1 thereby characterized in that windings or partial windings (8,3,10) for Generation of low output voltages on cem ferrite core like this are atu-arranged so that they correspond to the one that supplies the equivalent voltage Winding (7) have a lower coupling factor. BATH ORIGINAL 334737; $ Stabilized power supply system according to point 1 or 2, characterized in that an air gap (22) of the ferrite core arranged within the leg enclosed by the windings eats Stabilized power supply according to points 1 to 3, characterized in that the winding for the primary storage inductance (5), the feedback winding (4) and the winding (7) providing the comparison voltage on the one hand to the secondary windings for generating the supply voltages for the electrical construction stages (8,9) and on the other hand for the additional secondary winding (11) connected to the accelerating electrode of the picture tube are separated by protective insulation (23,24). Stabilized power supply according to points 1 to 4, characterized in that the entire winding arrangement is impregnated or encapsulated with flame-retardant synthetic resin. Stabilized power supply device according to points 1-5, characterized in that the supplying the comparison voltage Rectifier arrangement (16, 17) with such a series resistance (18) is provided that the beam current dependent image width change reaches a minimum. Stabilized power supply device according to items 1 to 6, characterized in that the screen grid of the picture tube (19) is connected via a rectifier arrangement (20, 21) to a terminal of the horizontal deflection stage (15) carrying return pulses . ■■ "■ '".-.'- ■ - "■■'"' ν ■■: -;' - For this 2 pages of drawings φ? 1 BATH ORIGINAL _ψ . ^^ ° ^{€ m}