A bridge rectifier may be Commonly found firstly of any SMPS circuit and is also released principally for rectifying the mains AC to an entire wave DC, which can be even further filtered using a filter capacitor and applied to the mosfet/inductor stage to the supposed flyback primary side switching https://power-supplies-repair66655.blog5.net/72795140/power-supplies-repair-things-to-know-before-you-buy