Device and method for counting flanks of electrical pulses

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means

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361 86, 361101, H02H 318

Patent

active

059781947

ABSTRACT:
A device for counting the edges of electric pulses is disclosed and comprises a first capacitor connected in series with a pump circuit, which comprises a first resistance in series with a first diode connected in parallel with a second resistance, and a second capacitor connected in parallel with the first resistance. When a voltage, which is caused by one of the edges of an electric pulse, is applied across the first capacitor and the pump circuit, the first and second capacitors are charged in series with a charge that is essentially determined by the second capacitor. A first input of a comparator is connected to the connection point between the first capacitor and the pump circuit and a second input of the comparator is connected to a comparison potential, in order to indicate that a given approximate number of pulses have been counted when the voltage across the first capacitor exceeds a threshold level determined by the comparison potential.

REFERENCES:
patent: 4127886 (1978-11-01), Easter
patent: 4423457 (1983-12-01), Brajder
patent: 5095261 (1992-03-01), Schoofs

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