Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1973-09-26
1976-01-27
Heyman, John S.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
307235H, 307235T, 318678, 318681, 352141, 354 44, G03B 710, G05B 106
Patent
active
039355241
ABSTRACT:
An electronic switching system for the control of a load, such as a motor serving to adjust the diaphragm of a motion-picture camera, comprises a normally inactive comparison circuit including a transistor bridge with a pair of NPN transistors in one pair of adjoining arms and a pair of PNP transistors in the other pair. Two complementary transistors in each half of the bridge, lying between diagonally opposite corners, are provided with a common biasing circuit shunted across that bridge diagonal, the load being connected across the other bridge diagonal. Each biasing circuit includes a resistive voltage divider with taps joined to the bases of the associated bridge transistors and a group of cascaded ancillary transistors connected across a section of the voltage divider containing one of these taps. The first ancillary transistor of each cascaded group has its base connected to an associated input terminal receiving a switching signal and a reference voltage, respectively. A differential amplifier, connected across the input terminals, emits an unbalance signal which applies power to a pair of normally open-circuited ancillary transistors, forming part of the two cascaded groups to activate the comparison circuit by energizing the emitters of these ancillary transistors via a switching stage including a constant-current source.
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Millman & Taub, Pulse, Digital, and Switching Waveforms; McGraw-Hill Book Co.; 1965, pp. 389-402.
Cap Heinrich
Krammer Herbert
Scheiber Robert
Anagnos L. N.
Dubno Herbert
Hauser Raimund
Heyman John S.
Montague Ernest G.
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