Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1990-02-20
1990-11-27
Stephan, Steven L.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 16, 363 17, 363132, H02M 7537
Patent
active
049741420
ABSTRACT:
An improved switch-mode power supply having a direct current power source, a transformer, first and second switching transistors in series with the primary winding of the transformer, and drive means for generating signals to switch on the switching transistors. In the improved circuit, a connection is provided through a diode to complete a circuit through the first switching transistor and part of the primary winding on activation of the drive means, drawing energy from a junction between two reservoir capacitors in series. The current from this circuit generates a field in the core of the transformer which is sensed by an auxiliary winding and switches on the second switching transistor, allowing a circuit to be completed through both switching transistors and the entire primary winding of the transformer. In a further embodiment of the circuit, third and fourth switching transistors are also provided in series with the primary winding of the transformer to complete a second circuit through the direct current power source. The drive means sends two series of pulse-width modulated drive pulses, the first series switching on the first switching transistor and the primary winding in one direction, and the second series of pulses, 180.degree. out of phase from the first, switching on the third switching transistor and the primary winding in the opposite direction. A rebalance winding of the transformer and related circuitry are also provided to maintain the reservoir capacitors in balance.
REFERENCES:
patent: 4403269 (1983-09-01), Carroll
patent: 4585986 (1986-04-01), Dyer
patent: 4594649 (1986-06-01), Rhoads et al.
patent: 4736284 (1988-04-01), Yamagishi et al.
patent: 4754385 (1988-06-01), McDade et al.
patent: 4908857 (1990-03-01), Burns et al.
Stephan Steven L.
Sterrett Jeffrey
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