Abstract: A bypass valve assembly includes an outer casing and a spaced outer liner defining an annular bypass channel for channeling bypass air. The outer liner includes a plurality of circumferentially spaced slots around which are positioned an annular valve body. The valve body is positionable from a closed position substantially blocking bypass airflow into the slots to an open position uncovering the slots. Positioning means rotates and translates the valve body over the outer liner for covering and uncovering the slots.

Abstract: A control circuit (36) on the primary side of a converter senses the output voltage and is useful for modulating the drive pulse width of a switching transistor (30). An averaging circuit (78) averages the drive pulse and compares this average with an average of the drive pulses for all switching transistors in a system of parallel converters to produce an error signal. In response to the error signal, the drive pulse width is varied so that the load current is distributed evenly among the parallel converters to improve the system efficiency.