Fig 1.
Proposed FB cascaded CW multiplier based dc-dc converter.
Fig 2.
Ideal waveforms of the developed dc-dc converter during one switching period in CCM mode.
Fig 3.
Operating stages of the proposed converter.
Fig 4.
Graphical representation of gain changes due to the change in the duty cycle for the suggested converter forn = 1to 5 and the conventional boost dc-dc converter.
Table 1.
Comparison of different parameters of the developed dc-dc cascaded converter with others.
Fig 5.
Input current ripple as a function of input boost inductance.
Fig 6.
Voltage stresses on different devices for the proposed converter and others at duty cycle d = 0.5 and output voltage at Vo = 380V.
Thus, the required input voltage decreases as the number of stage increase. (a) Capacitor voltage stress. (b) Switch voltage stress.
Fig 7.
Output voltage ripple changes with the change in output capacitance.
Fig 8.
Voltage gain at different component numbersfor duty ratio,d = 0.5, Vo = 380V for the developed converter and other topologies.
Table 2.
Comparison between the developed converter and some other converters applicable in PV application.
Table 3.
Specifications of the proposed converter prototype.
Table 4.
Components description of proposed converter prototype.
Fig 9.
Simulation results of the developed FB cascaded CW converter.
Fig 10.
Experimental wave shapes of the developed converter.
(a) Gate signals: Sa1(Vgs), Sa2(Vgs), Sm1(Vgs) and Sm2(Vgs). (b) CW multiplier terminal (or FB) voltage and current, vb and ib respectively, and parallel inductor current, iLp.
Fig 11.
The output voltage, Vo, boost inductor current, iLs and output current, Io.
Fig 12.
Calculated, simulation and experimental voltage gain, Mv versus duty ratio, d for the developed converter for n = 1 to 3 at 50% load.
Fig 13.
Measured efficiency for different input voltages.
Fig 14.
Loss breakdown (calculated value) of the key components of the developed converter.
Fig 15.
Maximum power of the two monocrystalline type PV panels and irradianceon a sunny day.
Fig 16.
Maximum power of the two monocrystalline type PV panels and irradiance in a cloudy (slight rain) day.