EMI suppression techniques for very high efficiency and very high-power density medium power AC-DC adapters
Konferenz: PCIM Asia 2023 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
29.08.2023-31.08.2023 in Shanghai, China
doi:10.30420/566131069
Tagungsband: PCIM Asia 2023
Seiten: 5Sprache: EnglischTyp: PDF
Autoren:
Jitaru, Ionel (Rompower Energy Systems Inc., USA)
Savu, Andrei (Rompower International SRL, Romania)
Radoi, Constantin (Polytechnic University of Bucharest, Romania)
Inhalt:
The paper will present several solutions designed to meet the EMI requirements under EN 55022 class B limit, for a 240W AC-DC adapter with USB-PD 3.1, wherein the output voltage can vary between 5V to 48V and an output current of up to 5A. The targeted power density is 28W/inc3 and the overall efficiency in the worst case at 90Vac is 95%. There are mechanical limitations regarding the size of the EMI filter to meet the proposed power density. The paper will analyze the EMI levels with a chosen EMI filter suitable to fit in a case of 70x75x28 (mm). The efficiency and EMI results are analyzed in three cases. The first case the transformer design does not use any shielding technique, the second case a traditional coper foil shield is utilized, and the third case is utilizing Rompower active shield technique. The comparison between these three implementations will be made in respect of EMI measurement, in respect of system efficiency and in respect of thermal behavior.