![]() ![]() ![]() In the 1950s, switching power supplies were complex and expensive, used in aerospace and satellite applications that needed small, lightweight power supplies.īy the early 1970s, new high-voltage transistors and other technology improvements made switching power supplies much cheaper and they became widely Switching power supplies are now very cheap, but this wasn't always the case. The switching power supply gets its name because it switches power on and off thousands of times a second, which turns out to be a very efficient way to do this conversion. Most consumer electronics, from your cell phone to your television, use a switching power supply to convert AC power from the wall to the low-voltage DC used by electronic circuits. Many electronic components work together to provide smooth power to your laptop. We hope that cross-compatibility between devices and chargers will continue and only become more universal.Inside the Macbook charger. While this is just an early look at USB Type-C and the USB-IF Power Delivery standard, later this year we expect to see several new systems sporting USB Type-C and we’ll be sure to keep you updated on the charging situation. This may suggest that the MacBook power adapter is indeed capable of following at least some PD profiles but that they just aren’t labeled on the power adapter. What is perhaps more interesting though is that the Chromebook Pixel 2015 charges at all (albeit at a slower rate and a warning message “Low power charger connected – Your Chromebook may not charge while it is turned on”) when using the MacBook power adapter. We also found the MacBook does not charge any faster or slower using the Chromebook’s more powerful power adapter. It’s clear from our testing that the MacBook will accept charging signals from a PD power adapter like the Chromebook’s, but it is also clear that the MacBook adapter isn’t quite following the PD standard, rather something custom from Apple. ![]()
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