Method and apparatus for providing multiple autoregulated temperatures
US5911898A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1995 |
| Grant date | Jun 15, 1999 |
| Priority date | — |
| Expiry date | May 25, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2206/023
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention generally relates to use of constant current power supply to control temperatures of a device to plural Curie temperatures, without sacrificing the precision and uniformity of temperature achieved in the known devices. In accordance with exemplary embodiments, multiple layers of alloy having different Curie temperatures are separately accessed as an outer most layer is heated through its Curie point. Power to the device can be controlled by varying a frequency of circulating current and by searching to identify a layer of Curie point material which provides heating at a temperature accurately controlled to a fixed value, where any one of a number of different such temperatures may be selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.