Inverter circuit with a control circuit for leading transistors more effectively into a turned-off state

Claim 1

An inverter circuit, comprising: two transistors (1, 2) connected in series across the terminals of a direct-current supply, a control transformer (3) for transistors, the secondary windings (5, 6) of said transformer being connected to base control circuits of transistors (1, 2), a load circuit including a series connection of an inductive winding (7) and a capacitor (10, 11) and being connected across a point between transistors (1 and 2) and a power source, and a base current control circuit, including a secondary winding (16) for said inductive winding (7) and a winding (17) for a base control transformer (3), said latter winding being connected to said secondary winding (16), characterized in that the base current control circuit further comprises a collector-emitter circuit for transistor (1, 2) and that the control circuit is connected to the terminals of a power source by way of two rectifiers (20, 21), a given one of said rectifiers closing the control circuit while the other rectifier prevents the current from flowing through a presently conductive transistor (1 or 2) and control circuit (16, 17) to the power source terminal (- or +) opposite to said presently conductive transistor, whereby a voltage (U 3 ), induced in secondary winding (16) of said inductive winding and indicating the rate of decrease of the collector current of transistor (1 or 2), said voltage (U 3 ) being decreased by a collector-emitter voltage (U 1 ) of transistor (1 or 2), improves the switching off of transistor (1 or 2) as the hazard of simultaneous conduction of transistors (1 and 2) increases.