LLC RESONANT CONVERTER AS WELL AS CONTROL CIRCUIT AND RESONANT CURRENT SAMPLING CIRCUIT THEREOF

摘要

An LLC resonant converter as well as a control circuit and a resonant current sampling circuit thereof. An inductor is connected to a resonant cavity (30) of the LLC resonant converter, so as to induce a resonant current of the resonant cavity and convert the resonant current into an alternating current induced voltage; a voltage conversion sub-circuit further converts the alternating current induced voltage into a direct current voltage and outputs same to a controller (610). Therefore, the resonant current is sampled in real time, thereby providing a basis for further control of the controller, and the control to a turnoff current of a switch tube facilitates reducing switch loss of a bridge arm switch and improving the control accuracy of the controller.