Charge balancing current sampler for a digital motor control
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United States of America Patent
Stats
-
Feb 14, 1989
Grant Date -
N/A
app pub date -
Aug 4, 1987
filing date -
Aug 4, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An analog current sensing circuit is controlled by a current loop microprocessor. An integrator circuit stores charge which is the integral of armature current in a motor. The output is read by the microprocessor and divided by a time value to determine an average value of current. The microprocessor generates a pulse to discharge a capacitor in the integrator circuit to the same extent it was charged by a current feedback signal. At the same time the circuit may be sensing current for the next cycle. Leftover fractions of pulses are stored as charge on the capacitor and are included in values sensed in succeeding cycles. Both a method and a circuit are disclosed.
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