High-frequency heating device for variably controlling a high frequency output in a continuous or stepwise manner
US3939319A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1974 |
| Grant date | Feb 17, 1976 |
| Priority date | — |
| Expiry date | Jan 31, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/666
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high-frequency heating device includes an AC power source, a high-tension transformer, a triac thyristor connected between the primary winding of the high-tension transformer and the power source, a magnetron coupled to the secondary winding of the high-tension transformer, a signal generating circuit for generating upon energization a signal at a predetermined phase of each cycle of the power source voltage, an astable multivibrator for generating pulses whose pulse width is variable, and a control circuit for generating an output signal upon receipt of both an output pulse of the astable multivibrator and output of the signal generating circuit to control the triac thyristor in an ON-OFF fashion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.