Power supply with current measurement circuit for...

Details Power supply with current measurement circuit for... Power supply with current measurement circuit for...

2007-03-19

2008-08-12

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S679000, C363S021150

Reexamination Certificate

active

07411406

ABSTRACT:
A current measurement circuit to measure the output of a power supply transformer includes a simulation capacitor having a capacitance proportional to a parasitic capacitance of the transformer. The first electrode of the capacitor is coupled to an output winding of the transformer and the second electrode is coupled to a first node, with a second sense resistor coupled between the first node and ground so that current flowing through the simulation capacitor flows through the second sense resistor. Current flowing through a first sense resistor coupled to a second node and to ground has a component representative of the output current of the power supply and a component representative of the parasitic current. A differential amplifier coupled at an inverting input to the first node and at a non-inverting input to the second node generates an output signal that is proportional to the output current of the power supply.

REFERENCES:
patent: 3644806 (1972-02-01), Belson et al.
patent: 4054836 (1977-10-01), Povey
patent: 4409600 (1983-10-01), Minowa
patent: 4757263 (1988-07-01), Cummings et al.
patent: 2001/0017781 (2001-08-01), Hideaki

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