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Antistorage Overlap Circuit

IP.com Disclosure Number: IPCOM000080219D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Hart, BE: AUTHOR

Abstract

Transistors 2 and 3 are turned on and off alternately to produce an alternating voltage across the windings of a transformer 4. A clock circuit 5 establishes the timing for this alternating voltage. A group of transistors 6 forms a circuit for controlling transistor 2, and a similar circuit 7 controls transistor 3. A transistor 8 controls circuit 6 according to the AND logic function of a clock signal 9 and an input 10. A transistor 11 controls circuit 7 according to the AND logic function of a clock signal 12 and an input 13.

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Antistorage Overlap Circuit

Transistors 2 and 3 are turned on and off alternately to produce an alternating voltage across the windings of a transformer 4. A clock circuit 5 establishes the timing for this alternating voltage. A group of transistors 6 forms a circuit for controlling transistor 2, and a similar circuit 7 controls transistor 3. A transistor 8 controls circuit 6 according to the AND logic function of a clock signal 9 and an input 10. A transistor 11 controls circuit 7 according to the AND logic function of a clock signal 12 and an input 13.

Except for the operation of inputs 10 and 13, the circuits would switch transistors 2 and 3 in close phase relationship with clock circuit 5. In such an operation, one of the transistors 2 and 3 might be turned on before the other transistor has turned off, and thereby provide a low-impedance path through the two halves of the primary winding of transformer 4. Transistors 14 and 15 are connected to sense the off condition of transistors 2 and 3, and to produce a signal on lines 10 or 13 to enable turning on transistor 2 or 3 only when the other transistor has turned off.

A transistor 2 or 3 turns off when the associated circuit 6 or 7 has been switched by clock 5, and when the accumulated charge in the base-emitter junction of the transistor 2 or 3 has thereafter been removed. Transistor 15 has its base terminal connected to the base terminal of transistor 3 so that transistor 15 turns on with transistor 3 in res...