Induction heating apparatus using a saturable reactor for power control purposes
US4055740A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1976 |
| Grant date | Oct 25, 1977 |
| Priority date | — |
| Expiry date | Mar 15, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2038/003
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An induction heating apparatus includes a saturable reactor having a pair of rectangular ferrite cores. An air gap is provided in each ferrite core to provide a gradually increasing saturation characteristic on the magnetization curve of the cores. A pair of series-connected load windings is coiled around each core and a control winding is coiled around a common magnetic path of the cores. A power control circuit produces a DC control current that passes through the control winding. The high frequency energization current is passed through the load windings. Means are provided to control the DC control current at a desired setting. Preferably, the actual power level is detected to control the DC current through a feedback loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.