Two-wire power supply electronic switch
US5838555A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 24, 1997 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Sep 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/79
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A two-wire power supply switch connected in series with a load between two poles of an alternating current mains electrical power supply conventionally includes a main triac between two terminals of the switch which is turned on by the conduction of an optotriac with a time-delay relative to the zero crossing of the voltage between the switch terminals determined by the breakdown voltage of a series of Zener diodes. The switch includes a power supply unit with a rectifier bridge connected to one terminal directly and connected to the other terminal via a capacitor. An auxiliary triac shunting the capacitor is turned on by the optotriac on each zero crossing of the voltage between the switch terminals. This optimizes conditions when the switch is open and when the switch is closed separately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.