Drive-circuit of a brushless DC motor
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United States of America Patent
Stats
-
Apr 18, 2000
Grant Date -
N/A
app pub date -
Oct 17, 1997
filing date -
Oct 18, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Drive circuit for a brushless, electronically commutated DC motor, wherein an electronic switching element (T.sub.1, T.sub.2) is arranged in series with each phase winding (L.sub.1, L.sub.2) of the motor and the switching elements (T.sub.1, T.sub.2) are driven in response to a sensor (2) for the rotational position of the rotor, in particular formed as a digital Hall IC, wherein each phase winding (L.sub.1, L.sub.2) is connected to a common node (8) of the circuit via a respective decoupling diode (D.sub.1, D.sub.2), and wherein parallel to the phase windings (L.sub.1, L.sub.2) and the corresponding decoupling diodes (D.sub.1, D.sub.2) a protective transistor circuit (10) is arranged that is driven in such a manner that the inductively induced voltage peaks are eliminated.
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