US Patent 11863084 Multiplex control for multi-port AC/DC adapter with chopper

A multi-output AC/DC adapter can include a main power stage that receives power from an AC power source and delivers an intermediate output voltage, a plurality of regulator stages each comprising a chopper circuit that receives the intermediate output voltage and produces a regulated output DC voltage for one of the multiple outputs, and a controller. The main power stage can be a flyback converter, and the intermediate output voltage can be derived from a secondary winding of a flyback transformer of the flyback converter. The controller can provide a voltage reference signal and a feedback signal to the feedback loop of the main power stage, and the feedback signal can be an output voltage of one of the regulator stages. The controller can also provide a voltage reference signal to the controller of each of the regulator stages.