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Inverter Circuit with Hall Effect Device

IP.com Disclosure Number: IPCOM000080823D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Hart, BE: AUTHOR

Abstract

In the drawing, transistors 2 and 3 are switched by alternate phase signals at their base terminals. These transistors alternately drive opposite halves of the transformer primary winding 4 in their collector circuit, to produce an alternating-polarity voltage across a load in the circuit of the transformer secondary winding 5. Transistors 6 and 7 and associated resistors form a differential amplifier. The differential amplifier responds to the flux level of the transformer, to produce the switching signals at the base terminals of transistors 2 and 3. Zener diodes 8 and 9 are connected to limit the amplitude of this signal.

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Inverter Circuit with Hall Effect Device

In the drawing, transistors 2 and 3 are switched by alternate phase signals at their base terminals. These transistors alternately drive opposite halves of the transformer primary winding 4 in their collector circuit, to produce an alternating- polarity voltage across a load in the circuit of the transformer secondary winding
5. Transistors 6 and 7 and associated resistors form a differential amplifier. The differential amplifier responds to the flux level of the transformer, to produce the switching signals at the base terminals of transistors 2 and 3. Zener diodes 8 and 9 are connected to limit the amplitude of this signal.

The signal to transistors 6 and 7 is provided by a Hall effect device 10 that is located to sense the flux level of the transformer core. The components are arranged for the circuit to switch at a flux value suitably less than saturation. One advantage of this circuit is that it avoids the undesirable current-wave forms that occur in circuits of this general type, which use feedback windings on the transformer core to supply switching signals to the transistors. Another advantage, is that it overcomes the problem that circuits of this general type may operate the transformer unsymmetrically, with a flux density greater in one polarity than the other.

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