Electricity: motive power systems – Automatic and/or with time-delay means – Speed or rate-of-movement
Patent
1989-04-07
1990-05-22
Ro, Bentsu
Electricity: motive power systems
Automatic and/or with time-delay means
Speed or rate-of-movement
307519, 324 78R, 324166, 361239, G01R 2309
Patent
active
049280457
ABSTRACT:
A circuit arrangement for generating a useful direct voltage signal associated with the frequency of an alternating current signal serves, in particular, to regulate the synchronism of an electric motor. It includes a comparator circuit (7) which converts the two opposite polarity half-waves of the alternating current signal of a tacho coil (2) into pulses whose edges trigger a measuring and control circuit (18) which generates direct voltages corresponding to the half-period durations of the alternating current signal measured from the respective zero passages. The comparison voltage input (9) of the comparator (7) is connected with the output of a differential amplifier (10) whose two inputs (29, 30) are each connected to a storage capacitor (27, 28) which can be connected, via associated first and second switches (80, 81), with the useful direct voltage signal (22), with the first switch (80) being used to periodically couple out the useful direct voltage signal associated with the first half-periods and the second switch (81) being used to periodically couple out the direct voltage signal associated with the second half-periods.
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Papst-Motoren GmbH & Co. KG
Ro Bentsu
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