Automatic surge suppressor disconnect protection system
US5864454A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1997 |
| Grant date | Jan 26, 1999 |
| Priority date | — |
| Expiry date | Mar 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/042
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A surge suppressor disconnect protection circuit is coupled to a first surge suppressor. The first surge suppressor is electrically coupled to phase and neutral line terminals of an AC source to protect the first surge suppressor from predetermined overvoltages. The circuit includes a relay switch with a relay contact and a relay drive coil. The relay contact is setable to one of a high and a low impedance state. The relay contact is electrically connected to the first surge suppressor and to one of the line terminals. A signal adjuster is electrically connected at its phase port to the AC phase terminal and to the AC neutral terminal for rectifying AC to generate a DC signal. The adjuster filters the DC signal and scales the filtered DC signal. An amplifier is electrically coupled to the adjuster at a non-inverting input port and to a first voltage reference at an inverting input port. The amplifier output port is electrically coupled back to the inverting input port to provide a feedback path therebetween. An integrator displaying a predefined integrator time constant is electrically connected at its input port to the amplifier means such that a signal is generated at the integra…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.