Switching bipolar driver circuit for inductive load
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United States of America Patent
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-
Dec 24, 1991
Grant Date -
N/A
app pub date -
Jan 22, 1991
filing date -
Jan 22, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bipolar chopping driver circuit has a pair of NPN totem-pole connected driver transistors with a fly-back diode connected across the NPN source transistor and a biasing resistor connected between base and emitter of the source transistor. A fullwave bridge driver may be comprised of two such totem pole circuits with the inductive load connected between them at the junctions between NPN source and sink transistors. A clamp circuit is provided in both cases, for preventing the voltage swings at the bases of the source transistors from exceeding the DC supply voltage that is connected to the collectors of the source transistors, thereby permitting operation at high chopping frequencies without excessive delay in switching load current and excessive power losses.
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