Inductive stabilizing discharge lamp ballast

© Start of patent period: 1979 05 15

Longest possible duration:

© Issued on: 1979 12 10 © inventor:

© dependence:

© Pamphlets considered to delineate the prior art:

AT 353 904

AT-PS 294270 AT-PS 222783

- 2 No. 353904

The invention relates to an inductive ballast for a gas and / or vapor discharge lamp, which is provided with an elongate electric coil and at least one package practically the same, with the largest part of the surface abutting Mantelkembleche which are normal to the winding plane of the elongated coil winding ,

⁵ It is an object of the invention to provide an inductive ballast of the initially mentioned kind, in which the heat dissipation of the electric coil is optimal.

The ballast according to the invention initially mentioned type is characterized in that at least the outer legs of the sheath core sheets with the elongated legs of the coil büden an acute angle, whereby the outer legs of the sheets with its inner side against the coil winding io clamped.

An advantage of the inventive measures is that a good mechanical contact between these parts is obtained by the close fitting clamping of the laminated core to the electrical coil, which promotes the heat dissipation of the electric coil very. Another advantage is that an inductive ballast is obtained by the inventive measures, the profile 15 is slimmer than when the outer legs of Mantelkembleche approximately perpendicular to the elongated legs of the coil and there is a gap between these outer legs of the sheets and the coil , Further, the insertion of the sheets can be simplified in the coil, since you can provide a margin when inserting the sheets and still receive a good thermal contact of the sheets and the coil thereafter. With a slim profile is meant here that in a²⁰ has perpendicular to the longitudinal axis of the ballast cross-section of the same small dimensions. In the production of the ballast, in the course of which the sheath core sheets are rotated until they touch the coil, one can stop the rotation of the sheath core sheets when this contact occurs; but you can also continue after touching the coil through the sheets with the rotation of the sheets, whereby the windings of the electric coil are compressed closer together. This leads to an even better thermal contact, which promotes the cooling of the ballast.

An advantageous embodiment of the ballast according to the invention is characterized in that the plane of each sheet of the laminated core forms an acute angle with the elongated legs of the coil, so that the outline of the coil in a guided through a winding plane of the coil cross-section is approximately a parallelogram. So you get a very slim profile of the³⁰ Device.

To close the magnetic circuit and thus to reduce the air gap of the ballast, a second laminated core can be used. Hiebei you can order two packages of nearly the same sheets around the electric coil and rotate these packages at the same time on the same axis to make the concerns of the outer leg to the coil.

³⁵ You can turn every sheet of a package completely at an angle at which no deformation of the sheet occurs. However, it is also conceivable that only a portion of each sheet undergoes a rotation. It is also possible that a sheet metal part is rotated more than others. It is also possible in each case to rotate one outer limb of the sheets about an axis and the other outer limb of the sheets around another, both axes lying parallel to the center line of the electric coil, and the middle part of each sheet undergoing no rotation. Thus, it follows that each outer leg of each sheet of the laminated core forms an acute angle with the central core portion of the sheets. The sheets are kinked. This gives the Vorteü that lying in the coil sheet metal can hold a good thermal contact with this coil.

The laminated core of a ballast according to the invention, for example, from a combination of

U-shaped and T-shaped sheets be constructed. It is particularly advantageous to use such a laminated core as a combination of a package of E-shaped metal sheets and a package of T-shaped metal sheets.

It should be noted that from AT-PS no. 294270 an inductive ballast here in question type is known, are provided in the E-cut Mantelkembleche and closing the magnetic 50 circle between the two outer legs of the E-cut laminated core a T-cut laminated core is inserted. The outer legs of the E-cut laminated core are pressed after inserting the T-cut laminated core with a Spannmanschettenartig ausgebüdeten housing to the crossbar of the T-cut laminated core, with a slight pivoting of these outer legs to a

- 3 No. 353,904 perpendicular to the plane of the E sheets standing axis occurs. This compression of the E-cut laminated core sets the effective air gap of the device.

Even with a known from DE-GM 1849769 inductive ballast, the sheets are rotated to einzusteUen the size of the air gap. A disadvantage of this known ballast is⁵ that the mechanical contact between the laminated core and the outside of the electric coil is bad. This means that the heat dissipation of the coil is deficient.

The invention will now be explained in more detail below with reference to embodiments illustrated in the drawings. In the drawings, while Fig.l to 4 illustrate the development sequence of a first embodiment of a ballast according to the invention and Figures 5 to 8 the emergence¹⁰ sequence of a second embodiment of such a device; In detail, Fig.l shows in perspective an E-shaped laminated core, a T-shaped laminated core and an electrical coil, which components are provided for producing the ballast, Figure 2 in plan view, the components according to Fig.l after the assembly, the Figure 3 in a top view according to Figure 2 corresponding top view of a prepared from the aforementioned components according to the invention¹⁵ 4 shows a perspective view of the inductive ballast according to the invention, which is shown in Figure 3 in plan view, Figure 5 in a Fig.l representation corresponding to the production of another embodiment of an inventive Ballast provided components, wherein in the coil of the central Spulenteü is provided with a virtually non-deformable bobbin, Fig.6 in plan view the ²⁰ Components according to Figure 5 after assembly, Figure 7 in a plan view according to Figure 6 corresponding plan view of the second embodiment of an inductive ballast according to the invention in a final phase of the production and Figure 8 is a perspective view of this second embodiment of a ballast according to the invention.

In Fig.l is denoted by -l- an E-shaped laminated core, under which package -1- an electrical coil --2-- is arranged with a nearly rectangular cross-section, the two almost non-deformable U-shaped insulating wall sections -3 and 4 - Having, which are connected by connecting parts -5 and 6 with each other. The wall pieces -3, 4- prevent the coil sides from being deformed during manufacture. However, the connecting parts -5 and 6- are movable with respect to the wall pieces -3 and 4-. Under the coil -2- a T-shaped laminated core -8- is arranged.

³⁰ By means of a suitable tool, which is not shown in detail, the E-shaped sheets --Ι- with their side legs to the coil -2- and with their center legs in the coil --2-arranged. Thereafter, the T-shaped laminated core --8- pushed into the bottom of the coil -2-. Hiebei come the long legs of the E-shaped sheets on the T-shaped sheets for sitting on and it forms between the short legs of the package - 1- and the legs of the³⁵ Package -8- an air gap. This air gap is located in the coil -2-,

2, the top of the E-shaped laminated core -1- with -la-- referred to. Under this

Laminated core is the electric coil -2- arranged.

Upon receipt of the structure shown in Figure 2, the E-shaped and T-shaped sheets are rotated together about the axis of the spool -2- by about 15 ° (Figure 3). The axis of the coil -2- stands in Figs.2 and 3 perpendicular to the plane of the drawing. It can be seen that during rotation, the coil -2- undergoes a deformation, so that the original almost rectangular cross-section of the coil takes the form of a parallelogram. Then the E-shaped and T-shaped sheets are fastened together, eg by soldering or clamping.

In Figure 4 is full lines the finally obtained inductive ballast and with dashed lines

Lines the situation before turning the laminated cores --1 and 8- shown. For the sake of clarity hiebei also an axbox with three mutually perpendicular axes -20, 21 and 22- is given. The dimensions of a ballast realized in this way were approximately: length (in direction 22) 7 cm, width (in direction 21) 4 cm and height (in direction 20) 3.5 cm.

In a representation corresponding to the representation according to FIG. 1, the components are also shown in FIG. ⁵⁰ which are provided for association with a ballast according to the invention, dargesteUt u.zw. a package of E-shaped sheets -30-, a package of T-shaped sheets -38- and an electric coil -32- which in the present case, however, has a substantially non-deformable bobbin -33-. With -34 and 35- terminal contacts on the bobbin -33- are designated. The dargesteUten in Fig.5

- 4 No.353904

Components are assembled to form the ballast and it Figure 6 shows a plan view of the after assembly of the laminated cores -30 and 38- to the electrical coil -32- structure obtained. Thereafter, the rotation of the sheet metal parts takes place and it is in Fig.7 the final stage of the manufacturing process dargesteUt in which one half of the end portions of each ET sheet package combination to a first group of⁵ Axes and the other half of the end parts of each ET-laminated core combination is rotated about a second set of axes, whereby each sheet is angled twice. The rotation angle is about 30 °. The first and second group of axes are parallel to the centerline of the coil -30-. In this procedure, the bobbin -33- was not deformed. It was also achieved that the interior of the E-shaped and T-shaped shell -30 or 38- close to the outside of the electrical ¹⁰ Coil -32- is applied. After turning the sheet metal parts, the E-shaped sheets -30- are attached to the T-shaped sheets -38-. The finished ballast is shown in perspective in Figure 8. The dimensions of this ballast are approximately equal to those of the ballast of Figure 4.

The ballasts described are intended, in series with a gas and / or Dampfent¹⁵ Charge lamp to be connected to an AC voltage source. Each of the ballasts serves to stabilize the electric current through a lamp.

In an inventively designed inductive ballast, as shown in Figure 8, results in a much better cooling of the coil -32- than in a similar coil of a non-inventively designed inductive ballast, so a ballast whose plates ²⁰ not clamped to the winding. It was found that at a current strength of about 0.5 A through the electric coil of the temperature gradient between the electric coil and the outside of the metal jacket in the case of a ballast according to the invention according to Figure 8 was about 15% lower than in a ballast, whose sheets had not been brought by bending to the concern on the winding. This means that the ballast according to the invention can be charged with a larger electrical current, ie this ballast can be used in conjunction with a lamp that is sized for a higher amperage.