Synchronized input latch circuit with conditioning circuits for AC inputs
US4916331A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 27, 1988 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Jul 27, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/135
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An AC input conditioning circuit comprises a latch circuit, one or more latch conditioning channels, and a latch synchronizing circuit that is coupled to an AC source and has an output supplying a latch enable pulse to the latch enable terminal of the latch circuit only when the AC power signal exceeds predetermined latching threshold during alternate half cycles. The conditioning channel comprises an input coupled to a device whose on or off sense is to be detected, and an output coupled to a corresponding channel of the latch. Each conditioning channel can be comprised of a rectifier diode, followed by a zener diode and a driver amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.