Universal temperature control circuits
US4404462A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1981 |
| Grant date | Sep 13, 1983 |
| Priority date | — |
| Expiry date | Mar 30, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/22
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Various electronic circuits are disclosed for controlling the temperature of an object by means of a resistive heating element. Some of the circuits include a digital display for displaying the actual temperature A plurality of different temperature sensors may be used, such, for example, as a resistive sensor, a thermocouple or a thermistor. The sensor may either have a positive or a negative temperature coefficient. Since most of the sensors are not strictly linear, different means are disclosed for compensating for their nonlinearity. Some of the control circuits feature a proportional control to which may be added an anticipatory control. Less sophisticated and more inexpensive circuits simply provide an on-off control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.