EP0710964A2 - Transformer for generating two high tensions showing great potential difference - Google Patents

Abstract

The transformer has a metal powder or ferrite core (1) and coil carriers (3') for the transformer windings, with at least 2 secondary HV signals of differing potentials obtained from the primary voltage. The core has a double U, or U-I cross-section, with coil carriers for the respective secondary windings applied to each of its arms, the coil carriers being identical and arranged symmetrically, with the primary transformer winding split between them.

Description

The invention relates to a transformer according to the introductory part of patent claim 1.

If you want to generate two high voltages with a high mutual potential difference from a voltage source with the help of a single transformer, this is the case with the commonly used E-core and U-core structures, in which the primary coil is arranged on a single bobbin and usually only one bobbin is used for all coils, the problem of maintaining sufficient spacing for winding insulation with a reasonable component size.

With the invention, the aforementioned problem is solved by the features mentioned in the characterizing part of claim 1.

The invention allows a space-saving, compact transformer structure with sufficiently large distances between the high-voltage windings to achieve reliable mutual insulation.

The subclaims relate to preferred configurations of the transformer according to claim 1.

Fig.1

den Transformator in Frontansicht,

Fig.2

den Transformator in Seitenansicht und

Fig.3a- 3d

einen bei dem Transformator gemäß Fig. 1 und 2 verwendbaren Spulenkörper, u.zw. in Fig. 3a in Ansicht von oben mit Blickrichtung in Richtung der Spulenkörperlängsachse, in Fig. 3b in Seitenansicht im Schnitt entlang der Schnittlinie 3b,3b in Fig. 3a, in Fig. 3c in Seitenansicht für den Betrachter der Fig. 3a von links gesehen und in Fig. 3d in Seitenansicht für den Betrachter der Fig. 3a von unten gesehen.

The invention is explained in more detail below with reference to the drawing using an exemplary embodiment. The drawing shows:

Fig. 1

the transformer in front view,

Fig. 2

the transformer in side view and

Fig.3a-3d

a coil former that can be used in the transformer according to FIGS. 1 and 2, etc. 3a in a view from above with a viewing direction in the direction of the coil body longitudinal axis, in FIG. 3b in a side view in section along the section line 3b, 3b in FIG. 3a, in FIG. 3c in a side view for the viewer of FIG. 3a seen from the left and in FIG. 3d seen from below for the viewer of FIG. 3a in a side view.

1 and 2 has a two-part ferrite or iron powder core 1, either designed as a U-U core or as a U-I core, on the two legs 2 of which a one-piece chamber bobbin 3 or 3 'is arranged in the exemplary embodiment.

The two chamber bobbins 3, 3 ', the structure of which is shown in detail in FIGS. 3a-3d, are identical to one another and arranged on the core 1 in such a way that they are parallel to the drawing plane of FIG. 2 and to the drawing plane of FIG. 1 vertical center plane M of the core 1 are arranged symmetrically. The primary winding of the transformer is divided in half between the two bobbins 3, 3 ', the winding halves P / 2 being located in the lowest chamber a of the respective bobbin 3 and 3' for the viewer of FIGS. 1 and 2, respectively.

The two high-voltage windings, not shown in the drawing, are divided into the chambers b₁-b₅ of each chamber bobbin 3 or 3 ', the thickness d of the chamber base b' surrounding the respective core leg 2 b 'in the chambers b₁-b₅ from those for the primary coil halves P / 2 provided chambers a gradually increases away from chamber to chamber.

From each bobbin 3 and 3 'from three pins 4a-4c extend outward, two of which with the ends of the relevant primary coil half P / 2 are connected and the third is used to connect one end of the high-voltage winding led out of the chamber b 1, the other end of which is mechanically fixed to a pin 5 located above the chamber b 1 and is connected to a high-voltage line, not shown.

The bobbins 3, 3 'are wound in the chambers b only to such an extent that between the high-voltage winding carried by the bobbin 3 on the one hand and the high-voltage winding carried by the bobbin 3' of opposite polarity on the other hand, there is a sufficiently large insulation distance everywhere.

The wound bobbins 3, 3 'are preferably cast.

The core 1 has a right-angled, in the exemplary embodiment square cross section, and the coil formers 3, 3 'are adapted to this cross section, as can be seen in particular in FIG. 3a.

The coil formers 3, 3 'are in one piece in the illustrated embodiment, but this is not a mandatory requirement.

Claims (3)

Transformer with metal powder or ferrite core (1) and arrangement of the coils on at least one coil body (3,3 '), characterized in that the core (1) as UU or. To generate two secondary high voltages of large potential difference from the primary voltage UI core is designed and on each of the two core legs (2) one of the two high-voltage windings carrying chamber bobbins (3,3 ') is arranged, the two chamber bobbins (3,3') being identical to each other and symmetrically arranged and the The primary winding is divided in half (P / 2) and arranged in chambers (a) which are symmetrical to one another and located at one end of them. Transformer according to Claim 1, characterized in that in the case of each coil former (3, 3 ') in the chambers (b₁-b₅) provided for receiving the high-voltage windings, the thickness (d) of the chamber base adjacent to the relevant core leg (2) and enclosing it b ') gradually increases in the direction away from the primary winding chamber (s) (a) from chamber to chamber. Transformer according to claim 1 or 2, characterized in that the core legs (2) surrounded by the coil formers (3, 3 ') have a rectangular cross section.

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