High frequency heating generator having an improved matching network between a tetrode amplifier and a resonant circuit
US5286941A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Jan 16, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A high frequency heating generator which includes an electron tube amplifier, the output of which is connected to a resonant circuit that is electromagnetically coupled to a part to be heated, and a controlled frequency oscillator. The oscillator outputs a high frequency signal to the input of the amplifier. It also includes circuitry to measure the phase shift between the current output to the resonant circuit and the voltage at its terminals, and to modify the frequency of the oscillator as a function of this phase shift. The invention can be applied notably to devices for heating by electromagnetic induction, dielectric losses or plasma.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.