Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1976-08-03
1978-03-28
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
330124R, 318681, G05B 1128
Patent
active
040817318
ABSTRACT:
Direct current error signals of either polarity are converted to a unipolar voltage and used to offset a triangular timing wave. The offset wave is applied to threshold amplifier so as to produce pulse width modulated signals. The pulse width modulated signals, together with a polarized direction signal and a clock signal from the triangular wave source, is applied to a servo amplifier containing first and second channels, each containing a flip flop for opening the associated channel in accordance with the polarity of the direction signal so as to pass direct or inverted pulse width modulating signals, respectively, through amplifier and filter circuits to the output terminal. Each of the amplifier circuits has a current sensing resistor, and a switching transistor arranged to switch the associated flip flop and thereby open that channel whenever the current through the sensing resistor exceeds a predetermined level.
REFERENCES:
patent: 3323031 (1967-05-01), Kasper et al.
patent: 3525029 (1970-08-01), Joslyn et al.
patent: 3588710 (1971-06-01), Masters
patent: 3795869 (1974-03-01), Mionet et al.
Dobeck B.
Roehl Joseph M.
Sperry Rand Corporation
Terry Howard P.
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