Two-wire frequency to DC converter
US4167706A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1978 |
| Grant date | Sep 11, 1979 |
| Priority date | — |
| Expiry date | Jan 31, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K9/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A two-wire frequency to DC converter utilizes a multistage binary counter which is controlled by a crystal oscillator and the input frequency. This arrangement provides precisely shaped square wave pulses at the output of the counter whose frequency is functionally related to the input frequency and which can be fed into a low pass filter to obtain an average DC value for the AC input. The output terminal at each stage of the binary counter has a plurality of open terminals, each associated with a particular frequency. By connecting a single diode across a selected open terminal, the converter which is constructed without regard to any input frequency, so it can be mass-produced, can be easily customized for a particular input frequency range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.