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Constant Voltage Switching Regulator

IP.com Disclosure Number: IPCOM000076383D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Ruddy, GA: AUTHOR

Abstract

This constant-voltage switching regulator provides a low voltage, close-tolerance power supply that is independent of the individual distribution system and changes in load.

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Constant Voltage Switching Regulator

This constant-voltage switching regulator provides a low voltage, close- tolerance power supply that is independent of the individual distribution system and changes in load.

A remote ground point provides a ground reference to reference-voltage circuit 13, compensating for ground line losses in the distribution system and for changes in ground line Losses due to varying load. Reference-voltage circuit 13 generates a voltage that is equal to the desired output voltage which is fed to voltage-detect differential amplifier 15. The switching regulator output voltage is fed into the other side of differential amplifier 15, which compares the two inputs to generate an output to Schmitt trigger 17. If the output of the regulator is less than that desired, Schmitt trigger 17 provides a fast-acting oscillation free-step voltage to drive transistor switch 19 on. Schmitt trigger 17 drives transistor switch 19 off when regulator voltage exceeds the desired voltage.

The overcurrent differential amplifier 21 and the overvoltage circuit 23 monitor the output current and the output voltage, respectively, and act as protective circuits in fault conditions. If the output current becomes too large, an increased voltage appears across resistor R1, and the output of amplifier 21 acts through Schmitt trigger 17 to inhibit any driving of transistor switch 19 until the load current has reduced to an acceptable level. If the output voltage increases ...