Load current detection circuit
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United States of America Patent
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Oct 8, 1996
Grant Date -
N/A
app pub date -
May 11, 1995
filing date -
May 19, 1994
priority date (Note) -
Expired
status (Latency Note)
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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.
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