Control system for actuators which can be separately energized and deenergized
US4199690A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 15, 1977 |
| Grant date | Apr 22, 1980 |
| Priority date | — |
| Expiry date | Aug 15, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1912
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A control system for actuators which can be separately energized. The controller of the system has a two-position control unit and a three-position control unit and is followed by constant current source circuits, a stepping switch unit with threshold switches having a stepped reference voltage, as well as a logic circuitry interconnecting the stepping switch unit and the two-position control output. Prevention of overshoot or undershoot is achieved by means of additional logic circuitry interconnecting the switches at the positive and negative output of said three-position control unit, said two-position control output, and said first mentioned logic circuitry between the stepping switch unit and two-position control output. In this manner overshoot can be prevented by quickly de-energizing the actuator, which was last energized, when the actual value in the controlled system closely approaches the set-point or reference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.