Current measurement circuit for transformer with high...

Details Current measurement circuit for transformer with high... Current measurement circuit for transformer with high...

2007-03-27

2007-03-27

Nguyen, Vincent Q. (Department: 2858)

Electrophotography

Image formation

Development

C324S705000

Reexamination Certificate

active

11174119

ABSTRACT:
A printer apparatus includes a photoreceptor, a magnetic roll, an electrode, a current source coupled to the electrode, the current source having a signal generator coupled to an input winding of a transformer that exhibits a parasitic capacitance; and a current measurement circuit. The current measurement circuit includes a simulation capacitor having a capacitance proportional to the parasitic capacitance, the simulation capacitor having a first electrode coupled to a hot terminal of the output winding of the transformer and a second electrode coupled to a first node, a second sense resistor coupled between the first node and ground so current flowing through the simulation capacitor flows through the second sense resistor, a first sense resistor coupled to a second node, and a differential amplifier having an inverting input coupled to the first node and a non-inverting input coupled to the second node.

REFERENCES:
patent: 3644806 (1972-02-01), Belson et al.
patent: 4409600 (1983-10-01), Minowa

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