Linear oscillator for proximity sensor
US4068189A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1976 |
| Grant date | Jan 10, 1978 |
| Priority date | — |
| Expiry date | Oct 7, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/9547
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A linear oscillator circuit has a resonant circuit which develops an oscillating voltage V.sub.R having an amplitude proportional to a distance between a conducting body and the resonant circuit located within a probe. A control power drive circuit coupled to the output of the resonant circuit switches a current through the resonant circuit during each period of oscillation of the voltage V.sub.R. A reference current source is coupled to the control power drive circuit for drawing a current through the control power drive circuit and the resonant circuit. The magnitude of the current is equal to the magnitude of an independently established reference current. A detector circuit responsive to the value of the amplitude of oscillation may be provided to indicate the distance of the conductive body from the resonant circuit-containing probe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.