Abstract
In this paper, a soft switched high step-up converter with low number of passive components especially magnetic core is presented. Despite the voltage gain is achieved by adjusting the turns ratio of the coupled inductors, the main challenge of using them is to recycle the leakage inductance energy as soon as the switch is turned off. Thus, an active clamp circuit is employed which not only absorbs the leakage inductance energy but also provides the soft switching condition for all switches. Hence, the main and auxiliary switches are turned on at ZVS and turned off at ZVS condition. Also, all diodes turn off at ZCS which mitigates the reverse recovery problem. Thus, a higher operating frequency can be used without concerning for switching loss. Moreover, the existence of common ground between input and output reduces the control circuit complexity and also expands the applications of the converter. Moreover, since the switches voltage stress is low, switches with low drain-source resistance can be adopted to reduce the conduction loss. Considering the mentioned advantages, the efficiency of the introduced converter is enhanced notably. Finally, the proposed converter is simulated at 300W and 100kHz to verify the theoretical analysis and converter operation.
Published Version
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