Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1990-03-23
1992-05-05
Pellinen, A. D.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 98, H02M 744
Patent
active
051113805
ABSTRACT:
A half-bridge inverter is powered from a DC voltage source and has a series-tuned high-Q LC circuit connected across its output. A load is normally connected across the tank capacitor of the LC circuit. When a load is not so connected, the magnitude of the high-frequency current flowing through the LC circuit would tend to increase to destructively high levels. To prevent this from taking place, the high frequency current is controlled by making the inverter skip a charging-cycle each time the peak magnitude of this current exceeds a pre-determined level. In particular, during normally loaded operation, the LC circuit receives a charge from the DC voltage source for each individual half-cycle of the inverter's oscillation. However, if--during a given inverter half-cycle--the magnitude of the high frequency current exceeds a predetermined level, a control circuit acts to prevent the inverter from completing its immediately following half-cycle. As a result, with an unloaded series-tuned LC circuit connected across the inverter's output, each time the inverter acts to charge the LC circuit during a given half-cycle, the magnitude of the high frequency current increases beyond the predetermined level. Thereafter, the inverter will be prevented from re-charging the LC circuit until the magnitude of the high frequency current has decayed below the predetermined level; which will typically take about 30 cycles of free-running oscillations of the LC circuit.
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Hoff Marc S.
Pellinen A. D.
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