Oscillators – Solid state active element oscillator – Transistors
Patent
1977-09-21
1978-08-08
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331113A, 363 17, 363132, H02M 7537, H03K 330
Patent
active
041059573
ABSTRACT:
A full bridge inverter includes four bipolar transistors of like conductivity type, connected in a bridge circuit including an apex to which a load is connected. During a first time interval, emitter collector paths of a first pair of transistors are connected betwen a DC source and the apex so that current flows in a first direction through the apex while the transistors are forward biased. The emitter collector paths of a second pair of transistors are connected with the source and the apex so that current flows in a second direction through the apex during a second interval while the transistors of the second pair are forward biased. A first transformer has first and second windings respectively connected in series with the emitters of the transistors of the first pair, such that voltages at the emitters of the transistors of the first pair have a tendency to vary in the same direction. A second transformer has third and fourth windings connected in series with the emitters of the transistors of the second pair, with the windings being wound so that the voltages at the emitters of the transistors of the second pair have a tendency to vary in the same direction. Thereby, the turn-on and turn-off times of the transistors of the two pairs are simultaneous, to equalize turn-on losses and distributed turn-off losses between the transistors.
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Grimm Siegfried H.
Qualidyne Systems, Inc.
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