Browse Prior Art Database

Gate

IP.com Disclosure Number: IPCOM000097921D
Original Publication Date: 1961-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Athens, AS: AUTHOR

Abstract

The circuitry gates the output from a number of solar cells.

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Gate

The circuitry gates the output from a number of solar cells.

A gate transistor 1 connects through resistors 2a...2n to the base of amplifier transistors 3a...3n. The solar cells 4a...4n are connected to the base of their respective transistors. These decrease the base current through resistors 5a... 5n when light strikes the cell. This action turns off the transistor associated with the illuminated solar cell. The voltage at the output terminals 6a...6n drops, since the transistor is cut off, and essentially no current flows through load resistors 7a...7n.

When it is desired to gate the outputs from the solar cells off, a positive signal is applied to the base of transistor 1. Transistor 1 then conducts between emitter and collector to supply transistors 3a... 3n with base current through resistors 2a... 2n. These are much lower in resistance than resistors 5a...5n. With transistor 1 in this condition, there is sufficient base current to hold the amplifier transistors 3a...3n in the saturated state regardless of the solar cell output. In this manner, the solar cell output is gated off since the amplifier transistors are made independent of the solar cell output and indicate no illuminated solar cells.

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