Pulse width modulator digital servo system
US4138632A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1977 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Apr 4, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/912
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A pulse width modulator digital servo system combines a digital feedback signal, which is developed in response to a time based signal directly indicative of a positional physical parameter of a servo actuator, and a digital command signal, which is indicative of a desired position of the servo actuator, to produce a digital resultant signal. A pulse width modulator produces a control signal output that is pulse width modulated in accordance with the digital value of the resultant signal to control operation of the servo actuator to achieve the positional relationship commanded. The pulse width modulated control signal is balanced when the combined resultant signal has a predetermined or constant value and is unbalanced in respective directions depending on whether the combined resultant signal is larger or smaller than such predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.