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Three-Level Current Switching Inverter

IP.com Disclosure Number: IPCOM000097760D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Gruodis, AJ: AUTHOR

Abstract

The three-level inverter provides a negative output when the input is positive, a ground output when the input is at ground, and a positive output when the input is negative.

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Three-Level Current Switching Inverter

The three-level inverter provides a negative output when the input is positive, a ground output when the input is at ground, and a positive output when the input is negative.

Transistor T1 is biased by diode D1 and resistor R1 so that it conducts when the input is at the ground level. Current through T1 causes a potential drop across resistor R3, which causes the emitter of transistor T3 to drop to a potential below the voltage +V2 connected to the base. Therefore, T3 does not conduct. Transistor T2 is biased by diode D2 and resistor R2 so that it conducts when the input resides at ground level. Current through T2 causes a potential rise across resistor R4. The voltage on the emitter of transistor T4 is raised above the voltage level -V2, cutting off T4. Therefore, when the input resides at ground, T3 and T4 are not conducting and the input resides at the ground level coupled to the output by resistor R5.

When the input resides at the positive level, T2 is cut off and the emitter of T4 drops towards the negative supply -V3, causing T4 to conduct. Current through T4 causes a potential drop across R5, resulting in a negative output. At this time, T1 is conducting and T3 is cut off. When the input is at the negative potential, T1 cuts off and the emitter of T3 rises towards the positive supply +V3, causing T3 to conduct. Current through T3 causes a potential rise across R5, resulting in a positive output. At this time, T2 is co...