A wide voltage converter includes a power-supply-side converter unit, n load-side converter units, and a step-up/step-down converter device having n transformers. The step-up/step-down converter device electrically connects the power-supply-side converter unit to the n load-side converter units. The wide-voltage-range converter is capable of operating without derating with n specified output voltages, which can be predetermined independent from one another, and reliably inhibits restart.