Three-mode analog controller with remote tuning
US4577097A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1982 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Sep 3, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF22G5/12
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A three-mode analog controller for regulating a signal corresponding to a controller variable to produce a controller output, comprises an integrating circuit, a proportional circuit, and a derivative circuit. The integrating circuit includes a reset adjustment for varying a time constant thereof, the proportional circuit includes a gain adjustment for varying the gain thereof and the derivative circuit includes a rate adjustment for adjusting the rate of derivation of the signal. The gain adjustment comprises a photoresistor associated with a source of light which is provided with varying current corresponding to the signal to vary the resistance of the photoresistor and, thus, the gain value. The reset and rate adjustments may also comprise photoresistors with light sources or may be formed of field affect transistors each controlled by a circuit and remotely located potentiometer or variable voltage source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.