Load current detection circuit

Details Load current detection circuit Load current detection circuit

1995-05-11

1996-10-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327310, 327384, 361 2, 361 13, 307137, H03K 1716

Patent

active

055635415

ABSTRACT:
A load current detection circuit restrains the generation of noise spikes with a minimum of circuitry when changing between current detection sensitivity ranges by providing a plurality of sensitivity resistors between the output of a voltage source, such as a negative feedback voltage amplifier, and a load. Sensitivity range changing is performed via switches that increase or decrease the number of sensitivity resistors between the voltage source and the load. When a current detection sensitivity change is commanded, a voltage difference across the sensitivity resistors is measured, and a control processor generates a control voltage for changing voltage difference gradually until the voltage difference is zero without changing the voltage across the load. The sensitivity range switching then occurs when no current flows through the sensitivity resistors so that no noise spikes are produced. Then the control voltage is gradually changed until the full load current passes through the selected sensitivity resistors.

REFERENCES:
patent: 4716398 (1987-12-01), Eccleston et al.
patent: 4771195 (1988-09-01), Stein
patent: 4808861 (1989-02-01), Ehni
patent: 4890021 (1989-12-01), Walker

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