In　this　paper,　the　multi-frequency　modeling　technique　is　adopted　to　derive　a　general　small-signal　model　for　various　DAB　resonant　converters,　based　on　which,　the　explicit　expressions　of　the　associated　transfer　functions　as　well　as　the　general　control　block　diagram　of　DAB　resonant　converters　are　obtained.　At　last,　a　simulation　circuit　of　a　DAB　series　resonant　converter　is　built,　and　the　phase-shift-angle-to-output-voltage　transfer　function　is　measured　to　validate　the　proposed　model.　©　2023　IEEE.