Research On High Gain Zeta DC-DC Converter Based On Coupled Inductor

With the increasing depletion of fossil fuels,green and clean energy,such as solar energy and fuel cells have been widely developed and applied.Solar energy has become one of the mainstream of the new energy utilization due to its advantages of no-pollution,wide distribution,various application forms.However,the PV module has the characteristic of the low-output voltage.In order to meet the requirements of grid connected power generation and power equipment,the high gain DC-DC converter is needed to boost low voltage to high voltage.Therefore,the research of DC-DC converters with high voltage gain and high efficiency has important signification.Firstly,according to the requirements of high voltage gain DC-DC converter,the Zeta boost converter based on the coupled inductor(CB-Zeta)is proposed by combining the Zeta converter,the coupled inductor technique and the voltage multiplier cells.The proposed converter has the advantages of high boost ability,the recycle of leakage inductance energy,and the restraint of the diode reverse-recovery problem.The working principle and steady-steate performance of the proposed converters are analysed detailedly and verified by the MatlabSecondly,A Zeta boost converter based on coupled inductor and double voltage multiplier cells(CBDV-Zeta)is proposed by introducing the double clamping circuit,the proposed converter integrates double voltage clamp circuits on the primary side of the coupled inductor,two voltage doubler capacitors are charged in parallel when the active switch is turned off,the leakage inductance energy can be absorbed synchronously,and the current stress of the corresponding diodes can be reduced;two voltage doubler capacitors are discharged in series when the main switch is turned on,which further extended the output voltage level.The working principle and steady-steate performance of the proposed converter is analysed detailedly and verified by the Matlab simulation.The state space averaging method is used to model the CBDV-Zeta converter and the closed loop compensation network is designed on this basis.And an principale prototy controlled by TMS320F2812 is build for experimental justification,the validity of the theoretical analysis is confirmed by the experimental results.