Abstract
A novel control strategy for pure continuous conduction mode (CCM) operation of a non-isolated five switch boost inverter is proposed in this paper. A conventional dc-dc boost converter is sandwiched between a full bridge dc-ac inverter in order to derive this inverter structure. This inverter which conventionally operates in discontinuous conduction mode (DCM) and discontinuous-continuous-discontinuous conduction mode (DCD) is made to operate in pure CCM using the proposed control strategy and hence possesses the following benefits: Firstly, this inverter attains an even higher voltage gain using CCM operation when compared with both DCM and DCD operation. Secondly, for CCM operation the inductor current ripple obtained is small in comparison with DCM and DCD operation. This inverter utilises only five switches which are operated using sinusoidal pulse width modulation (SPWM) and employs very few passive elements in its structure thus reducing the setup expense. Inverter behaviour for pure CCM operation is studied and its topology simulated using MATLAB/SIMULINK. Results of both open loop control and closed loop control are discussed and theoretically verified.
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