Strobe alarm circuit
US5128591A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 1991 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Jul 10, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A strobe light circuit for flashing a flashtube at a desired frequency includes a transformer the primary of which is repetitively connected and disconnected across a D.C. power source by a switch so that energy stored in the primary winding during closed periods of the switch is transferred to the secondary winding of the transformer, with a step-up in voltage, during open periods of the switch, and through a diode to an energy-storing capacitor connected in parallel with the flashtube. The closed period of each switch cycle is initiated at regular intervals by a timing signal and the open period is initiated in response to the attainment of a predetermined voltage across a capacitor connected across the power source indicating that sufficient energy is being stored in the primary winding during each cycle such that the energy transferred to the energy-storing capacitor during the open period of all cycles occurring during one flash period will be sufficient to enable the flashtube to produce a flash when triggered. A flash unit associated with the flashtube includes a trigger circuit that responds to two closely following trigger pulses to produce a double flash during each flash…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.