Electricity: power supply or regulation systems – Remote sensing
Patent
1978-03-29
1979-03-06
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
323 20, H02J 700, G05F 146
Patent
active
041433149
ABSTRACT:
A solar array-ion thruster system including a power control circuit which provides for use of the thruster itself in operating the solar array at the maximum power point. The power control circuit is connected between the solar array and the ion thruster and receives voltage and current signals from the former. The control circuit multiplies the voltage and current signals together to produce a power signal which is differentiated with respect to time. The differentiator output is detected by a zero crossing detector and, after suitable shaping, the detector output is phase compared with a clock in a phase demodulator. An integrator receives no output from the phase demodulator when the operating point is at the maximum power point but is driven toward the maximum power point for non-optimum operation. A ramp generator provides minor variations in the beam current reference signal produced by the integrator in order to obtain the first derivative of power.
REFERENCES:
patent: 3487291 (1969-12-01), Dowgiallo
patent: 3566143 (1971-02-01), Cherdak et al.
patent: 3816804 (1974-06-01), Cardwell
Manning J. R.
Musial N. T.
Pellinen A. D.
Shook G. E.
The United States of America as represented by the Administrator
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