Drive regulator utilizing variable pulse width signal

Details Drive regulator utilizing variable pulse width signal Drive regulator utilizing variable pulse width signal

1984-10-01

1986-03-18

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

318128, 331116M, 331156, 331183, H03B 530, H03L 500

Patent

active

045771642

ABSTRACT:
There is disclosed a drive regulation and control circuit for a tuning fork resonator also adaptable to other electrical devices wherein an approximately sine wave signal from a motion sensor is applied to an instantaneous level detector which causes a variable width pulse signal to be on during that portion of the sine wave signal where the instantaneous level exceeds an adjustable reference level; a control signal is generated with a magnitude varying as a moving average of the width of the variable width pulses; the control signal causes the reduction of current to the tuning fork drive to cause reduction of motion amplitude. An optional feature provides rapid response by activating a motion braking signal having a duration approximately equal to the variable width pulse "on" period. A distinctive feature of the instantaneous level detector is the fact that the sine wave signal is not rectified but is rather converted to a fluctuating direct current signal with a DC level accurately determined by an internal semi-conductor voltage reference element.

REFERENCES:
patent: 4177434 (1979-12-01), Ida
Wooton, "Phase-Locked-Loop Control of a Tuning Fork Oscillator", IBM Technical Disclosure Bulletin, vol. 22, No. 3, Aug. 1979, pp. 1088-1090.

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