The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 11, 1990
Filed:
Jul. 01, 1988
Alex J Severinsky, Silver Spring, MD (US);
Viteq Corporation, Lanham, MD (US);
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.