Electronic monitoring system including contactless motion detector
US3932803A · kind A · utility
Inventor
Key dates
| Filing date | Jun 12, 1974 |
| Grant date | Jan 13, 1976 |
| Priority date | — |
| Expiry date | Jun 12, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/945
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A contactless motion detector, including an oscillator and an amplifier, has an energizing circuit connected across an electronic breakdown device lying in series with a contant-current unit, this series combination receiving pulsating direct current from a supply circuit in parallel with an output thyristor which bridges either the entire series combination or only the constant-current unit. The output thyristor is controlled by a switching transistor responding to an output signal from the motion detector; even when the output thyristor fires to actuate a load in the supply circuit, a sufficient voltage drop is maintained across the breakdown device to keep the oscillator and the amplifier operating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.