Not all chargers are equally useful

The author shares their experience in analyzing and repairing modern GaN chargers, comparing high-quality solutions with budget alternatives. The article was prompted by the purchase of an inexpensive 240W power supply from a marketplace, whose specifications raised doubts compared to professional equipment. While developing a custom power module with Power Delivery support, the author delved into circuit design and charging standards. The article covers technical nuances of modern adapters, issues regarding discrepancies between advertised and actual performance, and the importance of high-quality components. The author provides a detailed breakdown of the internal structure of power supplies, explaining why significant price differences often point to compromises in safety and reliability. This material is useful for engineers and enthusiasts interested in electronics and power system design.