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Preregulator Feedback Circuit Using Light Actuated Switch

IP.com Disclosure Number: IPCOM000093884D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Harper, TP: AUTHOR

Abstract

This circuit is for preregulating the input to a series regulator transistor 10. At the same time, the circuit isolate s the primary and secondary ground systems. As the primary voltage of transformer 10 increases, voltage V2 and the voltage drop across transistor 11 also increase. At a predetermined voltage, zener diode 12 begins to conduct turning on transistor 13. Collector current from transistor 13 passes through diode 14 of light switch 15. With the increase of current in diode 14, switch 16 is turned on sending a control signal through amplifier 17 to input control of multivibrator 18 to shut it off. With multivibrator 18 shut off, capacitor 19 discharges to reduce the voltage across transistor 11 to its normal regulation level.

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Preregulator Feedback Circuit Using Light Actuated Switch

This circuit is for preregulating the input to a series regulator transistor 10. At the same time, the circuit isolate s the primary and secondary ground systems. As the primary voltage of transformer 10 increases, voltage V2 and the voltage drop across transistor 11 also increase. At a predetermined voltage, zener diode 12 begins to conduct turning on transistor 13. Collector current from transistor 13 passes through diode 14 of light switch 15. With the increase of current in diode 14, switch 16 is turned on sending a control signal through amplifier 17 to input control of multivibrator 18 to shut it off. With multivibrator 18 shut off, capacitor 19 discharges to reduce the voltage across transistor 11 to its normal regulation level. The lowering of voltage on transistor 11 is effective to turn off transistor 13 to reduce current in diode 14 of light switch 15. As current decreases in diode 14 switch 16 is turned off causing multivibrator 18 to resume operation.

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