High frequency induction heating circuit
US4309586A · kind A · utility
6Cited by
8References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 19, 1979 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | Sep 19, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2023/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A high frequency induction heating circuit for heating a plurality of articles where the heating circuit has a semiconductor oscillation circuit which includes a series resonance circuit having a heating coil and a condensor. A detection circuit for detecting changes in impedance and frequency variations in the heating coil is included as well as a current control circuit which is responsive to the detection circuit. A varible control gain regulation apparatus is included in the current control circuit such that current supplied to the coil becomes a non-constant current control depending on the number of articles to be heated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.