High step‐up pulse‐width modulation DC–DC converter based on quasi‐Z‐source topology

Abstract

In this study, a new high step-up non-isolated DC-DC converter is proposed. This converter is derived from quasi-Z-source inverter and quadratic boost converter. Compared with these converters, it gives higher gain at the same duty ratio. Steady-state analysis for the proposed converter operating in continuous conduction mode is presented. Expressions for power loss in each component and gain for non-ideal converter are derived. Design expressions for various elements of converter are derived. A small-signal model is derived and controller design is discussed. A prototype is implemented in laboratory to verify the performance of the converter. Experimental results show good agreement with the theoretical analysis and simulation results.

FPGA‐based implementation of single‐phase seven‐level quasi‐Z‐source inverter

“…30 The conduction loss and switching loss of the seven-level inverter are computed independently from expressions given in Ji and Wang. The overall loss comprises conduction and switching loss of the switch and losses due to passive components of diode, inductors, and capacitors of the qZs network, which is computed from the expressions given in Erickson and Maksimovic 29 and Patidar and Umarikar.…”

“…The overall loss comprises conduction and switching loss of the switch and losses due to passive components of diode, inductors, and capacitors of the qZs network, which is computed from the expressions given in Erickson and Maksimovic 29 and Patidar and Umarikar. 30 The conduction loss and switching loss of the seven-level inverter are computed independently from expressions given in Ji and Wang. 31 Efficiency % ð Þ ¼ P out P out þ P loss × 100% (31) Figure 16A clearly illustrates the power loss distribution across various components for a total load of 200 W at 0.25 duty cycle.…”

Input-Parallel Output-Series DC-DC Boost Converter With a Wide Input Voltage Range, For Fuel Cell Vehicles

“…The converter proposed in [16] uses a Z source network to achieve a higher voltage-gain, but the output and the input sides do not share a common ground, which may result in maintenance safety issues and additional EMI. The Quasi-Z source network is applied to the conventional Boost DC-DC converter in [17]. This converter, with high voltage gain also has a high voltage stress for the power semiconductors.…”

An Isolated High Step-Up Converter with Non-Pulsating Input Current for Renewable Energy Applications

“…In renewable energy applications, DC-DC converters with a high voltage gain and non-pulsating input current are required. Therefore, in [23]- [26], non-isolated step-up converters featuring a continuous input current is presented. High step-up converters with a non-pulsating input current offers several advantages.…”