Browse Prior Art Database

Push Push Inverter Using a Single Ended Input

IP.com Disclosure Number: IPCOM000092938D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Baumann, DD: AUTHOR

Abstract

This circuit utilizes the collapsing field of a switch-driven transformer to provide symmetrical output from the transformer secondary, increasing its power efficiency by nearly 50%.

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Push Push Inverter Using a Single Ended Input

This circuit utilizes the collapsing field of a switch-driven transformer to provide symmetrical output from the transformer secondary, increasing its power efficiency by nearly 50%.

Multivibrator 10 turns transistor switch 12 on and off. When transistor 12 is on, current flows in the primary of transformer 14. Voltage is induced in its secondary equal to N x V, where N is the turns ratio and V is the voltage across the primary. When transistor 12 is turned off, the voltage across the primary and secondary reverses in order to maintain the primary current. Since the very high impedance of transistor 12, when off, allows the reverse voltage to rise to a high instantaneous value destructive to transistor 12, diode 16 acts as a quench. This causes a loss of as much as one-half the available energy.

Zener diode 18 clamps the large reverse voltage to its breakdown voltage and the energy contained in the primary is now discharged at the zener voltage. If the breakdown voltage of diode 18 is approximately equal to V, then the effective voltage across the primary is equal to twice V.

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