An Efficient Voltage Step-up/down Partial Power Converter (SUD- PPC) using Wide Bandgap devices

Abstract

This paper proposed a novel topology for stepup/down converter based on the concept of partial power processing, which improves efficiency as well as power density. The unified modulation strategy achieves the auto transition between two operating modes without requiring any additional control. The operating principle is analyzed in detail, from which it is found that diode reverse recovery of Si MOSFETs reduces the voltage regulation range in step-down operation mode. Therefore, SiC MOSFET is employed in the high voltage side to avoid duty cycle loss. The SPICE simulations based on the SiC and Si devices have been built, and the simulation results verify the effect of using SiC devices. A 400V prototype based on SiC MOSFET has been built. Measurement results confirm the high efficiency in overall voltage range, and the maximum efficiency exceeds 99%.

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“…The PF values obtained in [23,111] were 0.94 and 0.93, respectively. Additionally, the authors in [23,45,59,62,111] achieved power factors of 4.94%, 0.91%, 0.97%, 0.89%, and 0.93%, respectively, with efficiency values of 95.5%, 99.62%, 98.77%, and 99.5% achieved in [23,59,62,111], respectively. Despite claims of high efficiency by the authors in [23,59,62,111], their CTHD values were quite above the recommended standard in IEEE Std.…”

“…There were no estimated values of power factor (PF) or current total harmonic distortion (CTHD) in [46] to justify the 66.6% efficiency obtained, as shown in Table 3. In addition, there were no reported CTHD values for the works carried out in [23,46,111], but the CTHD values for [45,59,62] were obtained as 4.62%, 8.32%, and 7.527%, respectively.…”

“…However, PPC may not be suitable if there is a significant variation in the voltage at the PCC or in a weak grid scenario during multiple FCS operations [46]. The PF values obtained in [23,111] were 0.94 and 0.93, respectively. Additionally, the authors in [23,45,59,62,111] achieved power factors of 4.94%, 0.91%, 0.97%, 0.89%, and 0.93%, respectively, with efficiency values of 95.5%, 99.62%, 98.77%, and 99.5% achieved in [23,59,62,111], respectively.…”

“…PPC parameter performances are presented in Table 3. The investigations conducted in [23,45,46,59,62,111] indicated converter-side control as the major strategy for the PPC architecture, as shown in Table 3. The authors in [23,45] deployed the DB controller, while the authors in [46,59,62] used the PI controller.…”

“…The authors in [23,45] deployed the DB controller, while the authors in [46,59,62] used the PI controller. The authors in [23,45,62] concentrated their efforts on voltage and current control, unlike the authors in [46,59,111], whose interest was only in current control. There were no estimated values of power factor (PF) or current total harmonic distortion (CTHD) in [46] to justify the 66.6% efficiency obtained, as shown in Table 3.…”