Protection Of High Power Modulators During Main Power Loss And Recovery

Abstract

High power modulators contain various stages of power conversion, from low voltage AC to high voltage DC, which usually receive their input power from public utility mains. These mains are subject to transients (over voltage surges and under voltage dips) that may last from several microseconds, to several hundred milliseconds or to a total blackout of power. The power modulator must operate without failure during the transient line conditions, the full l o s s of AC power, and the restoration of AC power.