Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Demand – excess – maximum or minimum
Patent
1988-07-01
1990-09-11
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Demand, excess, maximum or minimum
324103P, 324133, 324127, 324119, G01R 3102, G01N 2904
Patent
active
049566008
ABSTRACT:
A line isolated current detector for detecting low frequency peak to peak currents on a high frequency chopped line with a first series diode and resistor detecting positive waves and a second series diode and resistor detecting negative waves. First and second capacitors across the first and second resistors, respectively, temporarily store positive and negative detected waves. A third series diode and resistor connected in parallel across the first series diode and resistor and a fourth series diode and resistor connected in parallel across the second series diode and resistor allows faster charging and slower discharging of the capacitors. This allow the capacitors to charge waveforms quick enough to use a high frequency current transformer sensing a high frequency chopped line and discharge waveform slow enough to reconstruct the low frequency waveform before high frequency chopping to allow accurate current measurements of direct current or low frequency currents using a current transformer.
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Eisenzopf Reinhard J.
Nguyen Vinh P.
Viteq Corporation
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