Precision 50 percent duty cycle controller

Details Precision 50 percent duty cycle controller Precision 50 percent duty cycle controller

1988-09-09

1989-12-05

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 307265, 307236, 307494, 328 34, 328 62, 330252, 323312, 323316, H03K 500, H03K 522, H03K 508, H03F 345

Patent

active

048854751

ABSTRACT:
A sine wave locked in phase and frequency to a carrier having a high second harmonic content, carrying information on the magnitude of a parameter, is applied to an open loop operational amplifier which provides a trapezoidal waveform to a high speed, differential transistor pair which provides a pair of squarewave signals whose duty cycles are regulated by varying the threshold at which the differential pair switches. The squarewaves may be used as a second-harmonic-free demodualting signal. The fundamental premise is that if the amplitude levels of the squarewave levels of the squarewave are known to a high degree of accuracy, and they are equal in the positive and negative directions, then the average value is zero only for a 50% duty cycle. A current regulator generates a selected current to a constant value with a high gain amplifier. This current is switched from one side to the other of the differential pair by the trapezoidal waveform. The voltage excursions may be controlled in equal amounts above and below zero by selecting the resistive values in the collector circuits of the differential pair to be of a magnitude which will accomplish that end. The average value of the resulting squarewave is regulated to zero by integrating the voltage at the output of one of the collectors of the differential pair and varying the threshold at the base of the other transistor to obtain a 50% duty cycle.

REFERENCES:
patent: 3172952 (1965-03-01), Lentz
patent: 3188486 (1965-06-01), Favin
patent: 3381088 (1968-04-01), Lentz et al.
patent: 4034236 (1977-07-01), Aveneau et al.
patent: 4052679 (1977-10-01), Hosoya
patent: 4277697 (1981-07-01), Hall et al.
patent: 4527075 (1985-07-01), Zbinden

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