Active quadrature current reference source

Details Active quadrature current reference source Active quadrature current reference source

1980-04-07

1981-10-20

Shoop, William M.

Electricity: power supply or regulation systems

For phase shift or control

Using impedance

323358, G05F 100, H01F 4006

Patent

active

042963699

ABSTRACT:
This reference source provides a current which is of relatively high magnitude and which leads the voltage by substantially 90.degree.. It includes a reference capacitor which is highly stable and pure but of low capacitance, and a power capacitor which has a high capacitance. The capacitors are connected together at one end for coupling to a voltage source. A current comparator compares the currents flowing through the reference capacitor and the power capacitor, and provides a difference signal. A circuit generates a current in response to the difference signal and adds the generated current to the current through the power capacitor resulting in a current having a waveform and phase substantially identical to the reference capacitor current which leads the voltage source voltage by substantially 90.degree..

REFERENCES:
patent: 3142015 (1964-07-01), Kusters et al.
patent: 3188562 (1965-06-01), Kusters et al.
patent: 3568045 (1971-03-01), Yorke

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