DE4336929A1 - High frequency circuit breakers - Google Patents

Description

The invention relates to a high-frequency power scarf ter according to the preamble of claim 1.

Such a High frequency circuit breaker is already out of the DE 37 27 764 A1 known.

High frequency circuit breakers are used, for example, in Antenna tuners are used to turn on these devices High voltage inductors or capacitors for Adaptation of the antenna to the transmitter or receiver or to be able to switch off.

The high-frequency Lei known from DE 37 27 764 A1 Control switch has one in a glass bulb  melted reed contact on by a control coil is controlled in a closed electrical Shield housing is housed and the reed contact in surrounds a distance in a ring. The reed contact is at this solution via its protruding from the glass bulb Connection lugs on both ends on a mecha African device attached, consisting of two plate-like Metal discs with rounded bead-like edges stands, between which contact springs are arranged, between the connecting lugs of the reed contact are stuck.

The two fastening devices in turn are over High-voltage insulators with a wire connected to ground board connected.

Between the inner ring surface of the control's ring opening coil housing and the concentric ge in it at a distance The glass bulb of the reed contact is used as an insulator Air is present, so that the reed contact even at high fre quent high-voltage applications can be operated, the distance between the reed contact and this surrounding annular surface of the shield housing of the control coil according to the requirements of the desired high chip strength must be chosen. The shield housing the coil of this circuit breaker is grounded, while the reed contact is at high voltage potential.

The disadvantage of this solution is that the switch is off many individual parts, which is a complex assembly and result in high manufacturing costs. Furthermore, the reed contact with this solution is not directly on the  switching component (e.g. coil or capacitor) and therefore needs high-voltage insulation fixed support beams. The dielectric strength to the coils shielding (which lies on ground) is due to the geometry the ring coil and the number of which it controls Reed contacts limited.

The object of the invention is a Hochfre quence circuit breakers of the type mentioned create, whose dielectric strength is as high as possible and which is still as simple as possible to set up.

The achievement of this task is by characteristic features of claim 1 reproduced ben. The remaining claims contain advantageous training and Developments of the invention.

An advantage of this solution is that the switch only a few parts - essentially the bobbin and the reed contact - that exists without much effort can be assembled.

A second advantage is that the "seitli arrangement of the control coil next to the reed contact Dielectric strength of the switch against ground is essential is higher than with comparable conventional performance switch.

Furthermore, the dielectric strength of the switch is after Mass regardless of whether one or more reed contacts arranged in parallel by the same control coil controlled, d. H. be switched.

The invention is explained in more detail below with reference to FIG. 1. The figure shows a preferred embodiment of the high-frequency circuit breaker according to the invention.

The switch contains (as an example) a reed contact 1 melted into a glass bulb, which is connected at its ends to a high-voltage potential HF air coil 8 at its ends via a high-voltage-resistant solder connection 2 . The two solder terminals 2 are (by way of example) each connected to the coil 8 at the coil ends, so that the entire coil 8 can be bridged by switching on the reed contact. Instead of the coil 8, it is of course also possible to provide an electrical component (for example an HF capacitor) or another electrical component. Provision can also be made to bridge only a part of such a coil with such a reed contact.

The coil 8 may, for example, be at a voltage potential of 10-20 KV and operated in the MHz range. The coil 8 has terminals 10 and is held in an insulating high-voltage-resistant carrier 9 .

Laterally next to (or below) the reed contact 1 , the control coil 3-5 acting as an electromagnet is attached to a carrier plate 7 (e.g. made of aluminum). The control coil is shown in section and consists of a Spulenwick development body 5 , which is held in two end pole shoes 4 . In the coil interior, a coil core 3 is also provided, the z. B. may consist of soft iron. To reduce the excitation power, a permanent magnet coil core can also be provided instead of the soft iron core (this is not possible, for example, in the known solution according to DE 37 27 764 A1).

The control coil 3-5 is also sheathed for electrical shielding to the reed contact 1 with a simple metallic foil 6 (z. B. of copper).

Alternatively or in addition to the foil shielding the entire control coil assembly including the pole shoes inside a thin tin hood z. B. from Alumi nium, whose edges and corners are rounded det ("thermoformed hood"). Such a hood shields everyone Edges and corners of the pole pieces or the control coil from high electrical field strengths to the reed contact from and this reduces the risk of high voltage flashovers conditions (in other words, with this hood electri Avoid excessive field strength increases that would otherwise occur Corners, edges, etc.).

This arrangement of reed contact 1 on the one hand and control coil 3-5 on the other hand is characterized by

• - That the reed contact 1 can be attached directly to the component to be switched (here, for example: on the coil 8 ), which is not possible with the known circuit breaker DE 37 27 764 A1; (It goes without saying that the circuit breaker according to FIG. 1 can also be fastened to insulating, high-voltage-resistant support beams);
• - That the dielectric strength of the reed contact to ground potential (reference potential) is independent of the number of controlled reed contacts and only depends on the distance of the reed contacts to the control coil 3-5 or to the pole pieces 4 ;
• - That heating of the reed contact 1 cannot occur due to eddy current losses in the control coil 3-5 ;
• - That heating of the coil shield 6 due to eddy current losses, which the current of the switch generates in the coil housing, cannot occur;
• - That especially when using several of the same control coil driven reed contacts nevertheless the outside dimensions of the switch are kept small can be compared to the known solution according to DE 37 27 764 A1.

It is understood that the invention is not based on this example is limited, but rather to other is transferable. So it is z. B. possible several in Series (and possibly parallel) connected reed con to control clocks via the same control coil, d. H. to switch.

Claims (6)

1.High-frequency circuit breaker, with at least one reed contact melted into a glass bulb and with at least one electrically shielded control coil, where the at least one reed contact is at high voltage potential and the at least one control coil is at reference potential, in particular ground, and where the at least one control coil is in operative connection with the (assigned to it) at least one reed contact, characterized in that the at least one control coil ( 3-5 ) at a distance apart from the (assigned to it) at least one reed Contact ( 1-2 ) is arranged. 2. High-frequency circuit breaker according to claim 1, characterized in that the control coil ( 3-5 ) with pole shoes ( 4 ) is provided. 3. High-frequency circuit breaker according to one of the preceding claims, characterized in that the control coil ( 3-5 ) contains a soft iron core or a permanent magnet as a coil core ( 3 ). 4. High-frequency circuit breaker according to one of the preceding claims, characterized in that the control coil ( 3-5 ) for electrical shielding with a metallic foil ( 6 ), preferably a copper foil, and / or that is optionally coated with Polschu hen ( 4 ) provided control coil ( 3-5 ) is surrounded by a preferably made of aluminum housing with round corners and edges. 5. High-frequency circuit breaker according to one of the preceding claims, characterized in that the control coil ( 3-5 ) preferably with its pole shoes ( 4 ) on a plate ( 7 ), preferably on a metallic plate, in particular on an aluminum plate is fixed. 6. High-frequency circuit breaker according to one of the preceding claims, characterized in that the reed contact ( 1-2 ) is provided at both ends with a high-voltage-resistant solder connection ( 2 ).