Push-pull switching mode inverter-type power supply
AssigneePioneer Magnetics, Inc.
InventorsStephen H. Incledon, Bruce L. Wilkinson
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Abstract
A system is provided for driving the switching transistors in a push-pull switching mode inverter-type power supply. The system of the invention provides drive current adjusted to the actual power supply load throughout the entire switching cycle from turn-on to the completion of turn-off for each of the switching transistors. There is essentially zero power dissipation in the various elements which make up the system. Moreover, the system obtains substantially all of its drive power from the outputs of the switching transistors themselves, and it provides transformer isolation for the switching transistors.
Claims10
In a push-pull switching mode inverter-type power supply which includes an electromagnetic storage device and first and second switching transistors connected to the storage device for cyclically storing electrical energy in the storage device and releasing the energy into a load, said switching transistors introducing electrical energy into the electromagnetic storage device having positive halfcycles and negative half-cycles and further having a transition time between each of said half-cycles, a drive system for said switching transistors for alternately turning said switching transistors on and off, said drive system including:
- first and second switching circuits coupled to the first switching transistors respectively serving to turn the first switching transistors on and off;
- third and fourth switching circuits coupled to the second switching transistors respectively serving to turn the second switching transistors on and off;
- control circuitry connected to said first and second switching circuits and to said third and fourth switching circuits for supplying two distinct control signals to said first and second switching circuits and two distinct control signals to said third and fourth switching circuits to cause each of said first and second switching transistors cyclically to turn on and turn off, and with the first and second switching transistors being rendered conductive in alternate cycles.
Dependencies are inferred from the claim text.