Synchronous rectifier for use in a wireless power transfer system and method for synchronous rectification in wireless power transfer

A rectifier for use in a receiver of a wireless power transfer system, the rectifier for receiving wireless power transferred from a transmitter of the wireless power transfer system, the rectifier comprising a field effect transistor (FET) comprising:

• a source terminal electrically connected to ground;
• a drain terminal electrically connected to a receive element of the receiver, the receive element for extracting power from the transmitter of the wireless power transfer system;
• and
• a gate terminal electrically connected to the receive element, the gate terminal driven by a gate driver outputting a gate signal in phase with an input signal received at the receive element, the rectifier further comprising,
• a trigger circuit electrically connected to the receive element and the gate driver, the trigger circuit outputting a trigger signal for operating the gate driver, wherein the trigger circuit comprises,
• a sampling circuit for sampling the input signal;
• and
• a delay line for delaying output of the sampling circuit such that the gate signal is synchronized with the input signal received at the receive element.