US 5,111,024 A · High-frequency high-voltage power generator with a coax resonator

Abstract

In order to operate high-frequency heating equipment such as, for example, plasma torches, it is desirable to provide a power generator which will generate a high-frequency high voltage providing a large amount of power. If an oscillator circuit includes an electron tube (1), a control circuit (7) and a frequency-determining circuit that is formed by a coaxial waveguide (11) which is biased in the neighborhood of its short-circuited end a high-frequency high voltage will be obtained at the open end of the waveguide. The power supplied by the electron tube is stepped up to the permissible maximum value for given maximum supply voltage by having the electron tube generate the corresponding current, which is determined by the choice of the point (14) at which the coaxial waveguide (11) is biased.

Claims19

Dependent claims

A power generator for supplying a high-frequency high-voltage comprising:

an active element, a frequency-determining circuit connected in series to the AC main current path of the active element, and a control circuit connected to a control electrode of said active element, wherein the frequency-determining circuit comprises a coaxial waveguide having an electrical length of a quarter of the wavelength of the operating frequency of the power generator, one end of said waveguide being short-circuited and the other end being open, and wherein connection points of the waveguide to the AC main current path are situated in the vicinity of the short-circuited end and with at least one connection point located at an adjustable position.

Dependencies are inferred from the claim text.

High-frequency high-voltage power generator with a coax resonator

Life of this patent

High-frequency high-voltage power generator with a coax resonator

Life of this patent

Abstract

Claims19