There are two sources of complexity in the charger: PFC and efficient resonant converter, which is to be expected of high-quality charger. The whole magsafe h

There are two sources of complexity in the charger: PFC and efficient resonant converter, which is to be expected of high-quality charger. The whole magsafe handshaking mechanism, which looks like an afterthought to solve reliability problems caused by arcing on the pins, that also got used to block counterfeiters.