Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1993-09-22
1999-12-07
Riley, Shawn
Electric power conversion systems
Current conversion
Using semiconductor-type converter
H02M 75387
Patent
active
059994320
ABSTRACT:
In a self-oscillating full bridge inverter, a small non-linear inductor is connected in series with the inverter's load. Tightly coupled with this inductor are four individual secondary windings, one for each of the inverter's four transistors. By way of a high-speed rectifier for each secondary winding, at the end of each half-cycle of the inverter's 20 kHz squarewave output voltage, the energy stored in the inductor is used for: i) rapidly sweeping out the charges from the collector-base junction of the transistor last to cease conducting of the two most recently conducting transistors, and ii) for preventing the obverse two transistors from becoming conductive until the most recently conducting two transistors have both fully ceased to be conductive. As a result, even with a purely resistive load, the transistors are affirmatively prevented from forming direct conduction paths across the DC source.
REFERENCES:
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patent: 4464710 (1984-08-01), Gruber
patent: 4502107 (1985-02-01), Nilssen
patent: 4506318 (1985-03-01), Nilssen
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Schroeder, "Analysis and Design of a Highly Efficient Power Stage for an 18-KHZ 2.5KW DC-DC Converter", IEEE, Jul. 1981, pp. 273-283.
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