Programmable gain for switched power control

Details Programmable gain for switched power control Programmable gain for switched power control

1996-09-13

1998-09-29

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307 44, 307 52, 307 60, 307 80, 323906, 244173, H02J 308

Patent

active

058149031

ABSTRACT:
In the described embodiments, a spacecraft is powered by paralleled solar panels, which supply power to a load. The panels are ORed together, and each is controlled by a switched shunt, which provides coarse control of the load voltage. A control loop senses the load voltage, and logic selects those shunts which are conductive at any particular time in a manner which tends to maintain the load voltage constant. The control loop may undesirably become unstable because of gain changes caused by changes in solar panel insolation. A further controller adjusts the clock frequency at which the shunts are switched in a manner which tends to stabilize the loop. The further controller responds (a) to the current of one or more of the panels, (b) to the frequency of oscillations across the load, or (c) to both.

REFERENCES:
patent: 3816804 (1974-06-01), Cardwell
patent: 4575679 (1986-03-01), Chung et al.
patent: 4691159 (1987-09-01), Ahrens et al.
patent: 4794272 (1988-12-01), Bavaro et al.
patent: 5602464 (1997-02-01), Linkowsky et al.
"Loop Gain of a Spacecraft Switched Shunt Power System", IEEE Aerospace and Electronic Systems, vol. 30, No. 4, Oct. 1994, pp. 1049-1053.

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