DE966095C - Tube generator, especially for operating ultrasonic generators - Google Patents

Description

(WiGBl. P. 175)

ISSUED JULY 11, 1957

Tube generators for industrial and medical purposes are often operated in circuits, in which a non-rectified alternating voltage is used directly as the anode voltage is used. The best possible utilization of the anode voltage transformer and to strive for the individual tubes. The known circuits for operating tube generators with alternating voltage do not take this aspect into account by using the secondary winding of the transformer or parts of it can only be used for one half-wave. Other circuits, which take into account the mentioned point of view, are limited to the use two tubes, and the underlying circuit principle cannot be used for multi-phase operation.

A circuit is known with two in push-pull from the same AC voltage source powered tubes, each with half of the self-induction coil of an oscillating circuit in their anode circuit lies. The two tubes are not connected in series. A distribution of the load z. B. on four tubes is only possible by connecting two tubes in parallel, which is often undesirable is.

Also known is a circuit in which between the conductors of a three-phase system in each two parallel branches of electron tubes with opposite polarity lie. In series with a high-frequency choke is connected to each tube. All six tubes are over capacitors connected in parallel to a high-frequency oscillating circuit. In the circuit according to the invention In contrast, no chokes are required in the feed lines, and so is the number of high-frequency capacitors is much lower. By connecting tubes in series, it is also possible to

709 582/100

Claims (3)

which ensures symmetrical loading of the three phases to a greater extent. When switching According to the invention, as with the known circuit, the supply can be .immediately off a three-phase network. According to the invention, with a non-rectified low-frequency alternating voltage powered tube generator for generating high frequency energy two or more pairs ίο tubes connected in the same direction in series with polarity in the same direction is connected in parallel to a resonant circuit, and the anode voltage is applied as a single-phase or multi-phase voltage, the connection points between the anode and cathode of the Tube pairs supplied. The circuit according to the invention is particularly advantageous when operated with Three-phase voltage as it has smaller fluctuations in radio frequency energy than the known Circuits results in a good utilization of the so the transformer and the tubes allowed and the The stress on the tubes with reverse tension is relatively low. When operating two pairs of tubes with single-phase AC voltage, the disadvantage it can be seen that at least four tubes are required, but this is an advantage versus that the stress on the tubes is reduced with reverse tension that the Distribution of the power to a larger number of Tubing may be desirable to increase performance with a simple air cooling of the tubes Tubes get along, and that by the series connection of two tubes an even load both compared to magnification the efficiency of the tube generator is guaranteed by simply connecting tubes in parallel is. In the embodiments shown in Figs are to the terminals of an input or three-phase transformer connected to each two tubes, one with their Anode, the other with its cathode. These two to three pairs are connected in series in the same direction Tubes are parallel to an oscillating circuit with the same polarity. The terminals of the transformer are connected to one another in terms of high frequencies by one or two capacitors. In the Circuit according to Fig. 1, two alternating voltages phase-shifted by 180 ° are times transformer 5 and the connection points of anode and cathode each two tubes 6, 9 and 8, 7 fed. Alternately work on the parallel resonant circuit 11 the tubes 6, 7 and 8, 9. So there are both half-waves of the single-phase alternating voltage exploited. Due to a capacitor 10, the secondary winding of the transformer 5 is high-frequency bridged. This circuit is advantageous when it is easier to operate with AC voltage is required to distribute the power to more than two tubes. Fig. 2 shows a circuit in which the free winding ends of the star-connected secondary winding a three-phase transformer 12 to the connection points between anode and cathode one of three pairs of tubes 13, 14: 15, 16; 17, 18 are connected. The three pairs of tubes lie parallel to an oscillating circuit 20. The connections of the Three-phase transformer 12 high-frequency short-circuited. The high frequency power generated shows particularly small fluctuations, the frequency of which is six times the network frequency. The high-frequency generator can generally be fed with H-phase alternating voltage using η tube pairs. Pat ε ν ta n claims: ι. Tube generator for generating high frequency energy, in particular for the operation of ultrasonic generators with a plurality of non-rectified low-frequency Electron tubes fed by alternating voltage, which work on a common oscillating circuit, characterized in that two or more pairs connected in series in the same direction Tubes with polarity in the same direction are parallel to the resonant circuit, with the Anode of one tube is directly connected to the cathode of the other and this Connection points are connected to one another in terms of high frequencies by capacitors, and that a low-frequency single-phase voltage or the individual line voltages a symmetrical multiphase system as supply voltages between the two resp. between two of the connection points between the anode and cathode of a pair of tubes are laid. 2. Tube generator according to claim 1, characterized in that three polarized in the same direction Tube pairs are parallel to the resonant circuit and that the between each two of the mentioned Connection points are three supply voltages as linked voltages of the star-connected secondary winding of one Three-phase transformer. 3. Tube generator according to claim 1, characterized in that η !> 3 η tube pairs and a w-phase voltage are used. Considered publications: U.S. Patent Nos. 1,734,975, 2,252,941; French Patent No. 680 811;
Austrian Patent No. 159446;
British Patent No. 453,570;
Philips Technische Rundschau, May 1942, p 151; La Cour: "Theory of alternating currents and transformers", 1902, p. 264. 1 sheet of drawings © 70Ϊ 582/100 7. CT