Overspeed protection of sensorless electric drives is needed in the aerospace industry. Methods for overspeed protection may include software implementations, hardware implementations or combinations thereof. Typical high-speed rotating machinery is designed to sustain overspeed operation of up to 50% beyond maximum normal operation. This requirement leads to substantial penalties in weight and volume. The methods of the present invention may allow for an opportunity to reduce this overspeed design to about 5 to 15%, typically about 7%.

 
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< Band-gap voltage reference circuit

> Method of controlling DC-to-DC converter whereby switching control sequence applied to switching elements suppresses voltage surges at timings of switch-off of switching elements

> High power-factor AC/DC converter with parallel power processing

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