Method for maximizing the solar cell OPTO-electronic conversion efficiency in optically controlled hydraulic actuators
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United States of America Patent
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Aug 6, 1996
Grant Date -
N/A
app pub date -
Sep 23, 1994
filing date -
Sep 23, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for optically powering and controlling a hydraulic actuator in which the electrohydraulic servo valve is powered and controlled by a solar cell, with incident light at optimum level, but frequency-modulated at low amplitude, allowing optimum impedance matching to the servo valve solenoids. The signal is F.M. detected using a discriminator, which outputs are applied to the bases of two transistors in series with the electrohydraulic servo valve solenoids. The nearly constant output impedance of the solar cell or a follow-up amplifier allows optimum performance of the discriminator. The unique feature is the operation of the solar cell at a light level which is optimum for efficiency of the system.
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