Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-11-13
1976-08-03
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
317 27R, G01R 3102
Patent
active
039731855
ABSTRACT:
A circuit for monitoring the inductance of an inductive load controlled by phase-operated thyristor devices or similar devices. One embodiment of the invention comprises a first current sensitive device to produce a signal proportional to the current flowing through the load, a voltage sensitive device to produce a signal proportional to the voltage across the load, an inductor driven by the voltage signal and a second current sensitive device for producing a signal proportional to the current flowing through the inductor. The first current signal is then rectified and fed to a voltage divider consisting of five series connected resistors. The second current signal is also rectified and fed to the same voltage divider. A comparator is connected to the aforementioned voltage divider and senses any voltage change on the voltage divider due to a change in the ratio of the second current signal to the first current signal (or the inverse ratio) and thus in effect, senses any change in the impedance of the load.
REFERENCES:
patent: 2808566 (1957-10-01), Douma
patent: 2879472 (1959-04-01), Worden
patent: 3202877 (1965-08-01), Perrault
patent: 3281681 (1966-10-01), Stevenson
patent: 3284705 (1966-11-01), Dobson
patent: 3340434 (1967-09-01), Riebs
patent: 3519910 (1970-07-01), Pfaff et al.
Beak John H.
Speer Gordon W.
General Electric Company
Haubner J. Wesley
Strecker Gerard R.
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