PoDL powered device with active rectifier bridge and shunting switch

A method performed by a circuit in a Power over Data Lines (PoDL) system, the method comprising:

• conveying classification information, by a Powered Device (PD) logic circuit, to Power Sourcing Equipment (PSE), during a classification phase, via a first conductor and a second conductor;
• controlling a shunting switch for selectively shunting the first conductor and the second conductor together for communication with the PSE during the classification phase;
• supplying power to the logic circuit during the classification phase by a holdup capacitor, the capacitor having a first voltage terminal and a second voltage terminal;
• rectifying a voltage supplied by the PSE on the first conductor and the second conductor using a full-bridge rectifier to ensure the capacitor is charged with a proper polarity voltage, irrespective of a voltage polarity applied to the first conductor and the second conductor by the PSE, the rectifier comprising at least a first controllable switch and a second controllable switch;
• and
• controlling the first controllable switch and the second controllable switch to force one of the first controllable switch and the second controllable switch to be conductive during a time when the PD logic circuit controls the shunting switch to shunt the first conductor and the second conductor together, to create a completed circuit path between the first voltage terminal of the capacitor and the second voltage terminal of the capacitor via the shunting switch.