Test circuit including a power supply with a current transformer

Details Test circuit including a power supply with a current transformer Test circuit including a power supply with a current transformer

1996-05-23

1998-08-04

Brown, Glenn W.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324537, G01R 3102

Patent

active

057899347

ABSTRACT:
A measurement system is provided for the measurement of current supplied from a power source, wherein the power source provides a time-varying current, with certain portions thereof being supplied by discharge of an output capacitor. The measurement system includes a circuit for providing a supply voltage between a first terminal and a second terminal, with a sense resistor connected to the first terminal. A capacitor is coupled between the sense resistor and the second terminal and a current sensing circuit is coupled to the capacitor for sensing current flow therein and providing a first signal which is indicative thereof. At least one operational amplifier is coupled to the sense resistor and provides a signal that is indicative of voltage drop as a result of current flow therethrough. A summing amplifier is coupled to the current sense circuit and the operational amplifier and provides an output that is indicative of a sum of the first and second signals, thereby providing an indication of both power source output current and capacitor discharge current to a load connected between the first terminal and the second terminal.

REFERENCES:
patent: 4369407 (1983-01-01), Korbell
patent: 4868509 (1989-09-01), Ury et al.
patent: 4906937 (1990-03-01), Wikstrom et al.
patent: 5469071 (1995-11-01), Obata

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