Electrical continuity load monitoring circuit
US4799019A · kind A · utility
Inventors
Key dates
| Filing date | Mar 2, 1987 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Mar 2, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/58
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A load monitoring, indicating, and alarm system monitors electrical continuity through an AC electrical load coupled in a first electrical line with an electrical indicator such as an indicating lamp in a second electrical line coupled in parallel with the first electrical line. A first AC electronic switch such as a triac is coupled in series with the indicator in the second electrical line. The actuating gate of the first AC electronic switch is coupled to the first electrical line. The first AC electronic switch is therefore conducting and the indicator lamp on when there is electrical continuity through the load and power is being supplied to the load. A reactance control component is coupled in series with the load for adjusting the phase angle of gate current to voltage delivered to the gate terminal of the first AC electronic switch. The reactive component may be a second AC electronic switch coupled in series with the electrical load in the first electrical line. A resistor operatively couples the gate terminal of the second AC electronic switch to the second electrical line. A normally closed relay and alarm may be coupled in a third electrical line placed in parallel with…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.