Variable gain oven temperature control circuit
US4449032A · kind A · utility
16Cited by
14References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 9, 1983 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Feb 9, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The frequency of an electronic oscillator is controlled by a crystal located in the oven. The heaters in the oven include resistance elements for quick warm-up, and steady state. The circuit allows the quick warm-up power to be reduced incrementally as the set temperature is approached and effects a smooth transition to the steady-state heater. This is accomplished by circuit features which reduce the control loop gain when high power is applied to the heaters and increase the gain as the warm-up power decreases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.