In this paper, a new multi-input-multi-output (MIMO) dc-dc converter with high step-up capability is proposed for wide power ranges. Also, in order to increase each output voltage, diode-capacitor (D-C) voltage multiplier (VM) stages are utilized in the proposed converter. The number of input stages, output stages, and VM stages are arbitrary and dependent to design conditions. At first, the general structure of proposed MIMO converter is presented. Then, in order to explain the converter operation, we walk through the design of a 1 kW four-input-two-output example, including loss and efficiency calculations. We validate the design with a prototype that matches efficiency calculations.

A new dc-dc converter with high voltage gain is proposed in this study. The proposed converter consists of two switches which are turned on and off simultaneously. Additionally, two Switched-Capacitor (SC) cells and one Energy Storage (ES) cell are utilized in the structure of the proposed converter. These result in high voltage gains at low values of the duty cycle. Besides, the voltage stress across the power devices is low and below half of the output voltage. Therefore, the MOSFET switches with low RDS-on and devices with reduced nominal voltage can be used in the proposed converter which in turn reduces the conduction and turn-on losses. The analysis of the voltage and current stresses of the devices is accomplished. The circuit performance is compared with other solutions in the literature in terms of voltage gain and normalized voltage stress of switches and diodes. Eventually, in order to verify the theoretical analysis, the experimental results are provided.

In this paper, a new non-isolated high step-up Quasi Z-source dc-dc converter with coupled inductor techniques is presented, which is suitable for renewable applications. The main advantages of the proposed topology are continuous input current, common ground between load and input DC source, low normalized voltage stress on the semiconductors (switch/diodes) and low total voltage stress on devices compared to the conventional QZS converter. However, increasing the turn's ratio value of the coupled inductor windings not only doesn't limit the duty cycle but also leads to decrease the voltage stress on switch/diodes and increase the output voltage level. The operating performance of the proposed converter, theoretical analysis and comparison between the proposed converter and other published works (i.e. QZS converters) are provided. Finally, one prototype at 500W is built and tested which shows experimental results and theoretical analysis verify each other well

In this study, a new non‐isolated six‐phase interleaved boost dc–dc converter is presented for photovoltaic (PV) applications. The suggested structure consists of two symmetric three‐phase interleaved boost dc–dc converters along with two switched‐capacitor cells, in order to obtain high conversion ratio. For different values of duty‐cycles, the voltage conversion ratio of the proposed topology is high. Also, the voltage stress of switches for various duty cycles is low and the efficiency of proposed topology is high. Moreover, the value of input current ripple is low with the utilisation of interleaving techniques. These advantages cause the proposed topology to be a good candidate for PV systems. The operation modes and mathematical analysis of the presented converter is introduced. In order to show the merits of presented converter, comparison results with other boost dc/dc converters are provided. Both experimental and simulation works based 453 W are presented to verify the operation of recommended converter. PSCAD/EMTDC software is used for simulation work.

In this study, a new non‐isolated high step‐up DC–DC converter is presented with high‐voltage gain which is suitable for renewable applications. The proposed converter uses coupled inductor and voltage multiplier cell (diode capacitor) for increasing the voltage level. The voltage gain of the proposed converter can be increased by selecting the appropriate turns ratio of coupled inductor. Voltage multiplier cell consists of two diodes and two capacitors which are used to obtain high‐voltage gain. The diode‐capacitor cell is used as a clamp circuit, which leads to reducing the voltage stress across the semiconductors. The proposed converter has a single power switch which causes the control of the proposed converter is simple. Also, the power switch is used with lower ON‐state resistant ( R _DS‐ON ). The zero‐current switching of the diode is obtained in OFF state. Therefore, the conduction losses are decreased with lower normalised voltage stress across semiconductors. To prove the performance of the proposed converter, theoretical analysis and comparison with other converters are provided. To confirm the benefits of the proposed converter, a laboratory prototype with 20 V input voltage, 200 V output voltage and about 200 W power level at operating 25 kHz is built and tested.

In this study, a new high step-up DC-DC converter with zero voltage switching (ZVS) capability is presented for renewable energy applications. In order to achieve high voltage gain without extreme duty cycles or a high turn ratio, a combination of a coupled inductor and switched diode-capacitor voltage multiplier cells are used. In the presented converter only an auxiliary winding with a diode that operates under zero current switching (ZCS) is utilized to realize ZVS for two power switches. And an active clamp circuit is utilized to reach ZVS for the other power switches. The leakage inductance of the coupled inductor controls the current falling rate of the voltage multiplier and output diodes, and also they turn ON under ZCS condition. Hence, reverse recovery losses of the diodes are reduced. The voltage stress on the power switches is low, and low voltage rating switches can be adapted to reduce the losses of their conduction. Finally, a 1 KW experimental prototype setup with 50V input voltage and 470V output voltage is built to verify the converter performance.