Bias control for high efficiency inverter circuit
OwnerOle K. Nilsseninventor
Life of this patent
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Abstract
An improved high efficiency push-pull inverter circuit employing a pair of switching transistors that are alternately triggered into conduction by a control circuit, for converting DC voltage into high frequency AC voltage. The control circuit includes a pair of saturable transformers that are non-coupled to each other and are each connected to the base of a respective transistor. The bases are isolated from ground potential by a capacitor, and significant reverse voltage signals are developed and alternately applied to the base of a conducting transistor for rapidly turning it off, thereby increasing device switching speed and overall efficiency of the circuit.
Claims22
A push-pull inverter circuit connected to a unidirectional voltage input supply and being operable to provide an alternating voltage output, the inverter circuit having a main transformer in circuit with two alternately conducting switching transistors, each having a base, an emitter and a collector, the improvement comprising:
- separate non-coupled saturable inductor means for each transistor connected in circuit with the base-emitter junction thereof;
- and
- circuit means effective to establish an operating bias potential at the base of each transistor lower than the respective emitter potential whereby each saturable inductor means upon saturation provides an effective direct connection between said base and said operating bias potential for ensuring the rapid evacuation of charge carriers from the base for thereby turning the transistor off.
A push-pull inverter circuit connected to a unidirectional voltage input supply and being operable to provide an alternating voltage output, the inverter circuit having two alternately conducting switching transistors, each having a base, a collector and an emitter, the improvement comprising:
- first circuit means for connecting the transistors in series with the input supply voltage;
- separate non-coupled saturable inductor means for each transistor connected in circuit with the base-emitter junction thereof;
- and
- second circuit means effective to establish an operating bias potential at the base of each transistor lower than the respective emitter potential whereby each saturable inductor mean upon saturation provides an effective direct connection between said base and said operating bias potential for ensuring the rapid evacuation of charge carriers from the base for thereby turning the transistor off.
A push-pull inverter circuit connected to a unidirectional voltage input supply and being operable to provide an alternating voltage output, the inverter circuit having a main transformer in circuit with two alternately conducting switching transistors, each transistor having a base, an emitter and a collector, and the inverter circuit also having a separate, non-coupled, saturable inductor for each transistor connected in circuit with the base and emitter thereof, the improvement comprising:
- shunt diode means in circuit with the collector and emitter of each transistor.
A push-pull inverter circuit connected to a unidirectional voltage input supply and being operable to provide an alternating voltage output, the inverter circuit having two alternately conducting switching transistors connected in series, and each having a base, a collector and an emitter, and the inverter circuit also having a separate, non-coupled, saturable inductor for each transistor connected in circuit with the base and emitter thereof, the improvement comprising:
- shunt diode means in circuit with the collector and emitter of each transistor.
Dependencies are inferred from the claim text.