CH254100A

CH254100A - Device for igniting and supplying in operation a gas-filled electric discharge apparatus.

Info

Publication number: CH254100A
Authority: CH
Inventors: Eichenberger Ernst
Original assignee: Eichenberger Ernst
Priority date: 1946-10-10
Filing date: 1946-10-10
Publication date: 1948-04-15

Description

Dispositif pour l'arnoreage et 1'alimentation en fonctionnement dun appareil ä decharge electrique ä atmosphere gazeuse. La 1.)i-esentc Invention a pour objet un dis positif pour 1'amorqage et 1'alimentation en fonetionnement, ä partir dune souree de cou- rant alternatif, d'un appareil ä deeharge elee- triqtte < i atmosphere gazeuse, da.ns lequel la tension necessaire a 1'amorva.ge est notable- ix-nt plus elevee que la tension suffisante pour assurer un fonctionnement stable. Device for the arnorisation and the power supply in operation of an electrical discharge apparatus in a gaseous atmosphere. The 1.)i-esentc invention relates to a positive device for the priming and operating power supply, from an alternating current source, of a high-discharge device. triqtte <i gaseous atmosphere, in which the voltage necessary for 1'amorva.ge is significantly higher than the voltage sufficient to ensure stable operation.

0n connait dejä des dispositifs de ee genre Clans lesquelo, potir realiser 1'amorga.ge, 1'a,p- pai-eil it, decltarge est muni de cathodes cbauf- fecs par un courant Passant, Pendant quelques instanis, A travers tine induetanee, un Starter interrompant brtisduement 1e courant de chauf- kige pour provoquer Jans 1'inductarice une snrtension determinant 1'amoreage de 1'appa- r ('il < i tlecha,rge. Cette disposition offre deux inconvenients, dune Part, 1a, necessite de ehaaffer les catliodes, ce qui implique un re- tard dan5 1'.imoi-@age et, d'autre Part, la pre- sence Tun Starter, c'est-ä-dire d'un appareil tldlicaa, dont le fonctionnement n'est pas tou- ,oui-s tres sür, et peut entrainer, en ca.s de de feci:uosi.te, 1a, destruetion de 1'inductanee et de 1'appa.reil ä deeliarge lui-meme. Devices of this kind are already known in which, in order to carry out the amorga.ge, the a, pai-eil it, discharged is provided with cathodes heated by a passing current, for a few instants, through tine induetane, a Starter brtisdument interrupting the heating current to cause in the inductor a snrtension determining the priming of the apparatus ('it < i tcha, rge. This arrangement has two disadvantages, on the one hand, 1a, need to warm up the catliodes, which implies a delay in the image and, on the other hand, the presence of a Starter, that is to say of a tldlic apparatus, whose operation is not always very safe, and can cause, in case of failure, the destruction of the inductanee and of the device itself.

0n connait egalement des dispositifs du genre en question, utilisant 1e phenomene de 1a. resonance pour provoquer une sirrtension (itie Fon utilise pour 1 amorgage de 1'appareil ü- deckarge. 0n also knows devices of the kind in question, using the phenomenon of 1a. resonance to cause a sirrtension (itie Fon used for the ignition of the ü-deckarge device.

Ces dispositifs connus presentent toutefois 1'inconvenient de necessiter des condensateurs et des inductanees prevus pour supporter des tensions Ws superieures ä la tension de Ser vice, d'oü rencherissement et diminution de la securite. However, these known devices have the drawback of requiring capacitors and inductors designed to withstand voltages Ws greater than the operating voltage, hence increasing the cost and reducing safety.

La presente Invention vise ä eviter les de- fauts signales des dispositifs connus et elle a pour objet un dispositif du genre indique, qui se caracterise en ce qu'il comporte un conden- sateur et une inductance comprenant deux enroulements ayant un point commun et pos s6dant une inductance mutuelle, 1e condensa- teur etant relie, dune Part, ä la fois ä l'une des electrodes de 1'appareil ä decharge et ä Pun.e des Bornes d'alimentation et, d'autre Part, ä l'une des extremites de 1'un des enrou- lements, 1'autre extremite -de ce meme enroule- ment etant reliee ä 1'autre Borne d'alimenta- tion, tandis que 1'autre enroulement est reue, par son extremite libre, ä 1'autre electrode de 1'appareil ä decharge. The present invention aims to avoid the defects indicated in the known devices and its object is a device of the type indicated, which is characterized in that it comprises a capacitor and an inductor comprising two windings having a common point and pos. s6dant a mutual inductance, the capacitor being connected, on the one hand, both to one of the electrodes of the discharge device and to one of the supply terminals and, on the other hand, to the one of the ends of one of the windings, the other end of this same winding being connected to the other supply terminal, while the other winding is received by its free end, to the other electrode of the discharge apparatus.

Le dessin annexe represente, ä titre d'exemples, deux formes d'execution du dispo- sitif objet de 1'invention. The appended drawing shows, by way of example, two embodiments of the device which is the subject of the invention.

Fig. 1- represente 1e Schema des connexions de la Premiere forme d'execution. Fig. 1- represents the Connection Diagram of the First Form of Execution.

Fig. 2 montre 1e Schema. des connexions de la seconde. Fig. 2 shows the 1st Scheme. connections of the second.

Sur la fig. 1, an a represente en 1 et 2 les deux Bornes d'alimentation en courant alternatif d'un appareil ä decharge represente schematiquement en 3 et dont les electrodes sont indiquees en 4 et 5. Le dispositif repre- sente comprend deüx enroulements 6, 7 relies en Serie, le:ur point co#mmun etant indique en B. Ces deux enroulements sont montés sur un même noyau de fer 9 et possèdent, par consé quent, une inductance mutuelle notable. In fig. 1, an has represented at 1 and 2 the two alternating current supply terminals of a discharge device represented schematically at 3 and whose electrodes are indicated at 4 and 5. The device represented comprises two windings 6, 7 connected in series, their common point being indicated at B. These two windings are mounted on the same iron core 9 and therefore have a significant mutual inductance.

Le noyau de fer n'est toutefois pas indis pensable. Le point commun 8 des deux enrou lements 6, 7 est relié à la. fois à la borne 2 d'alimentation et à l'électrode 5 de l'appareil 3 par l'intermédiaire d'un condensateur 10; l'extrémité libre de l'enroulement 6 est reliée à la borne d'alimentation 1, tandis que l'extré mité libre de l'enroulement 7 est reliée à l'électrode 4. However, the iron core is not essential. The common point 8 of the two windings 6, 7 is connected to the. both to the supply terminal 2 and to the electrode 5 of the device 3 via a capacitor 10; the free end of winding 6 is connected to supply terminal 1, while the free end of winding 7 is connected to electrode 4.

Le fonctionnement du dispositif décrit est le suivant: Au moment où l'on établit la tension aux bornes 1 et 2, le courant circule à, travers l'enroulement 6 et le condensateur 10. La présence de l'enroulement 7 en série avec l'en roulement 6 a pour effet, ces deux enroule ments constituant un autotransformateur, La tension disponible pour l'amorçage. c'est-à-dire celle qui s'établit aux électrodes 4,'5 (sans tenir compte de la surtension tran sitoire possible suivant l'instant d'enclenche ment) est supérieure à 280 volts. The operation of the device described is as follows: When the voltage is established across terminals 1 and 2, the current flows through winding 6 and capacitor 10. The presence of winding 7 in series with the 'in bearing 6 has the effect, these two windings constituting an autotransformer, the voltage available for ignition. that is to say that which is established at the electrodes 4.5 (without taking account of the possible transient overvoltage following the moment of switching on) is greater than 280 volts.

Le rapport. des nombres de spires des en roulements 7 et 6 est 3 : 1. The report. number of turns in bearings 7 and 6 is 3:1.

Dans l'exemple décrit, la valeur de la self- induction de l'enroulement 6 et la valeur de la capacité -du condensateur sont telles qu'il n'y ait pas de résonance avec la fréquence du courant d'alimentation. In the example described, the value of the self-induction of winding 6 and the value of the capacitance of the capacitor are such that there is no resonance with the frequency of the supply current.

Dans la seconde forme d'exécution, on a utilisé les mêmes signes de référence pour dé signer les parties homologues à celles du pre mier exemple. In the second embodiment, the same reference signs have been used to designate the parts homologous to those of the first example.

Ce -deuxième dispositif ne diffère du pre mier que par le fait que le point de jonction 8 des deux enroulements 6, 7 est relié directe ment à la borne d'alimentaton 1, tandis que l'extrémité libre de l'enroulement 6 est reliée d'établir entre les électrodes 4 et 5 une tension supérieure à la tension existant aux bornes 1 et 2. Les nombres de spires des enroulements 6 et 7 sont prévus de façon que cette tension aux électrodes 4, 5 soit suffisante pour déter miner l'amorçage de l'appareil 3. Dés l'instant où cet amorçage est réalisé, le courant d'ali mentation circule à travers l'enroulement 6. l'enroulement 7 et l'appareil 3. L n courant dérivé circule à travers l'enroulement 6 et le condensateur 10; les valeurs de la capacité du condensateur 10, des self-inductions des en roulements 6 et 7 et leur inductance mutuelle peuvent être telles que le facteur de puissance de l'ensemble soit voisin de l'unité pendant l'alimentation en fonctionnement. de l'appareil à décharge. This -second device differs from the first only in that the junction point 8 of the two windings 6, 7 is directly connected to the supply terminal 1, while the free end of the winding 6 is connected to establish between electrodes 4 and 5 a voltage greater than the voltage existing at terminals 1 and 2. The numbers of turns of windings 6 and 7 are provided so that this voltage at electrodes 4, 5 is sufficient to determine the ignition of the device 3. From the moment this ignition is carried out, the supply current flows through the winding 6. the winding 7 and the device 3. The derived current flows through the winding 6 and capacitor 10; the values of the capacitance of the capacitor 10, of the self-inductions of the bearings 6 and 7 and their mutual inductance can be such that the power factor of the assembly is close to unity during the power supply in operation. of the discharge device.

Dans un cas particulier, les différents élé ments du dispositif représenté peuvent avoir les valeurs numériques suivantes: In a particular case, the various elements of the device represented can have the following numerical values:

Self-induction de l'enroulement 6 (?,33 henry Capacité du condensateur 10 4 microfarads Nombre de spires de l'enroulement 6 500 Nombre de spires de l'enroulement 7 1500 Tension aux bornes 1, 2 du dispositif 220 volts Fréquence du courant d'alimentation 50 périodes/seconde à la fois à la, borne d'alimentation 2 et à. l'électrode 5 par l'intermédiaire du condensa teur 10. Self-induction of winding 6 (?.33 henry Capacitor capacity 10 4 microfarads Number of turns of winding 6500 Number of turns of winding 7 1500 Voltage at terminals 1, 2 of device 220 volts Current frequency supply 50 cycles/second both to the supply terminal 2 and to the electrode 5 via the capacitor 10.

Les dispositifs -décrits présentent les avan tages suivants.: suppression des électrodes chauffées qui se trouvent remplacées par des électrodes simples (d'où simplification, dimi nution de prix et augmentation de la durée de vie des appareils à décharge) ; suppression du starter et de tout organe mécanique, ainsi que de tout commutateur auxiliaire; _amorçage ins tantané. The devices described have the following advan tages: elimination of the heated electrodes which are replaced by simple electrodes (hence simplification, reduction in price and increase in the service life of discharge devices); removal of the starter and any mechanical component, as well as any auxiliary switch; _instantaneous priming.

En choisissant convenablement les valeurs des différents éléments, on peut atteindre un facteur de puissance voisin de l'unité. By suitably choosing the values of the various elements, it is possible to achieve a power factor close to unity.

Claims

CLAIM: Device for priming and powering it in operation, from an alternating current source, of a device with electrical discharge in a gaseous atmosphere in which the voltage necessary for priming is notably higher than the voltage sufficient to ensure stable operation, characterized in that it comprises a capacitor and an inductor comprising two bearings having a common point and possessing a mutual inductance, the capacitor switched off connected, d on the one hand, both to one of the electrodes of the discharge device and to one of the supply terminals and, on the other hand, to one of the ends of one of the windings, the the other end of this same winding is connected to the other supply terminal, while the other winding is connected, via the free end, to the other electrode of the discharge device. B> SUB-CLAIMS: 1. Device according to claim, characterized in that two windings are connected in series, the free ends of the two windings being connected, one to, the second mentioned supply terminal and the other to one (the electrodes of the discharge device, while the junction point of these two windings is connected to the first mentioned supply terminal, by through the capacitor. ?. Device according to claim, characterized in that the common point of the two windings is connected to the second supply terminal mentioned, while the free ends of these windings are reconnected, one to. the first mentioned supply terminal, via the capacitor, and the other to the second mentioned electrode of the discharge apparatus. 3. Device according to claim, characterized in that the ratio of the number of turns of the winding located between the junction point of the two windings and the discharge device, to the number of turns of the other rolling, has a value greater than 7. 4. Device according to claim, characterized in that the values of the self-inductance of the winding connected to the second mentioned supply terminal and of the capacitance of the capacitor are chosen so that there is no resonance with the frequency of the supply current. 5. Device according to claim, charac terized in that its power factor during the supply in operation of the discharge apparatus is close to unity.