Inverter converter circuit for maintaining oscillations throughout extreme load variations
AssigneeBoschert Assoc.
InventorRobert J. Boschert
Life of this patent
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Abstract
A magnetically coupled two transistor multivibrator for use with power supplies. In addition to the usual collector driven output transformer, an auxiliary transformer having its secondary winding in series with the transistor base drive circuits is employed. The auxiliary transformer has primary windings powered by emitter current. Provision is also made for feedback from the main output transformer so that the secondary base drive windings can be powered from either emitter or collector currents. Electronic means are employed to isolate the output transformer from the base drive transformer upon the occurrence of a short circuit in the load, thus permitting the emitter windings to take over the function of supplying feedback and maintaining oscillations.
Claims5
A two transistor magnetically coupled multivibrator for use with power supplies capable of maintaining oscillations under extreme load conditions comprising:
- a conventional multivibrator with a collector driven output transformer having load windings and transistor base drive feedback windings,
- a base drive transformer in addition to the said output transformer having primary windings powered by emitter currents of the two transistors, and having secondary windings connected to drive the base/emitter circuits of the two transistors and powered by feedback from both the output transformer feedback windings and the said base drive transformer primary windings,
- and an electronic means of disconnecting the said output transformer feedback windings from the said base drive transformer upon the occurrence of a load short circuit so that the electrically "dead" output transformer is thereafter prevented from drawing power from the said base drive transformer and oscillations will continue solely due to feedback within the said base drive transformer.
Dependencies are inferred from the claim text.