Electrical circuit for a centrifuge
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United States of America Patent
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-
Feb 4, 1992
Grant Date -
N/A
app pub date -
May 6, 1991
filing date -
May 5, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To control the speed of an alternating-current drive capacitor motor of a centrifuge, the motor is connected to the bridge arm of a single-phase inverter. The bridge arm is connected at each of its ends to the midpoints of a series circuit of two capacitors and two field-effect transistors, these series circuits being connected in parallel with one another and connected to the output of a rectifier operated by the a.c. voltage supply. During operation, the capacitors are discharged by means of triggering the field-effect transistors alternately via the capacitor motor, the triggering being performed via a microprocessor serving as a pulse generator.
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