Analysis of An Improved Short-circuit Protection for Multilevel PWM ac/dc Converter

멀티레벨 PWM ac/dc 컨버터의 향상된 단락보호기법 해석

This paper describes an improved short-circuit protection for a multilevel ac/dc power converter The output do power of the proposed converter can be disconnected from the load within several hundred microseconds at the instant of short-circuit fault. Once the fault has been cleared the dc power is reapplied to the load. The rising time of the do load voltage is as small as several hundred microseconds, and there is no overshoot of the dc voltage because the do output capacitors hold undischarged state. Therefore, the proposed converter can be used for a power supply, which requires a rapid disconnection of the load from the power supply in the case of a short circuit, as well as a rapid connection the load to the power supply after the clearance of the short circuit condition.