Circuit for controlling current switching in multiple inductive loads, with single current detector, particularly for windings of step motors
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United States of America Patent
Stats
-
May 22, 1990
Grant Date -
N/A
app pub date -
Sep 16, 1988
filing date -
Oct 5, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The circuit controls current switching in multiple inductive loads (L1, L2, L3, L4) fed by means of respective switching switches (SW1, SW2, SW3, SW4) and by means of respective current adjustment switches (SWA, SWB), and comprises a single sense resistor (R) in series to said switching switches, and a single comparator circuit (C, FF) adapted to generate a logical signal (Q) when the voltage across the sense resistor exceeds a reference voltage (V.sub.ref), which drives a plurality of AND gates (PA, PB) which control said adjustment switches and the second inputs whereof are driven by respective square-wave signals in opposite phase with a period equal to twice the switching period.
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