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Browse Prior Art Database

Opposite Polarity Voltage Generator

IP.com Disclosure Number: IPCOM000076970D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Barcomb, JC: AUTHOR

Abstract

An oscillator 10 turns transistor T1 on and off at a given frequency, depending on the time constant for resistor R and capacitor C. While T1 is off, C charges with the polarity shown through R and diode D1.

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Opposite Polarity Voltage Generator

An oscillator 10 turns transistor T1 on and off at a given frequency, depending on the time constant for resistor R and capacitor C. While T1 is off, C charges with the polarity shown through R and diode D1.

When T1 turns on, the positive side of C is pulled to ground and the negative side provides a negative polarity relative to ground, thereby reverse biasing D1 and forward biasing diode D2, to supply a negative voltage to a load connected to the output. R2 and C2 comprise an RC filter to smooth the output.

For full-wave rectification another oscillator, transistor, resistor, capacitor and diode D1 can be connected to the output through a diode D3 with 180 degrees phasing to give full-wave output for better regulation.

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