No, because DC means direct current, it is only suitable for single-phase reverse pass characteristics. If you want to change 220 to 100, you need an AC transformer. The diode is only suitable for rectification. You need a 100V transformer, and it is best to To make a rectifier bridge with four diodes, you need two capacitors with a voltage resistance of at least 250V. Connect them together so that the output voltage is a stable DC voltage of 100v. I hope this can help you. Thank you