Abstract
Quasi-Z-source derived push-pull converter is a new topology intended for energy harvesting from renewable energy sources. Use of the topology shows that currents in the input and output parts strongly depend on the implementation of the output rectifier. This paper presents a comparative study and an experimental evaluation of the four output rectification stages. Analytical expressions for the voltage and current stress of rectifier components are presented. Experimental verification with the 400 W prototype was performed in the input voltage range of 40 V to 400 V at 400 V output voltage. Efficiency and duty cycle of active state, i.e. the DC gain characteristic, were measured in that range. Experimental waveforms for each topology are presented. Waveforms were measured at the input voltage 80 V, i.e. at the DC gain factor equal to 5. DOI: http://dx.doi.org/10.5755/j01.eee.20.6.7264
Highlights
INTRODUCTIONThe concept of the quasi-Z-source inverter (qZSI) was proposed by Prof. F
The concept of the quasi-Z-source inverter was proposed by Prof
It follows from the obtained results that the 2C-FW rectifier has better performance for applications requiring a wide regulation range of the input voltage
Summary
The concept of the quasi-Z-source inverter (qZSI) was proposed by Prof. F. Peng in 2008 [1] It is based on the two-port impedance network that couples inverter circuit to the input DC source. QZSI provides high EMI immunity, wide regulation freedom and continuous input current. These (a) advantages make the qZSI suitable for renewable and alternative power applications (solar panels, fuel cells, wind power generators, etc.) [2]–[5] and propulsion motor drive applications [6], [7]. It is derived by the combination of a singleswitch non-isolated quasi-Z-source converter (qZSC), coupled inductors, and the conventional push-pull topology. Voltage values in the quasi-Z-source networks depend on the duty cycle of active state (DA) and the input voltage: VC1
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