High step‐up cascaded DC–DC converter integrating coupled inductor and passive snubber

Abstract

A new high step-up cascaded DC-DC converter is proposed in this study, which is composed of one cascaded boost converter, one diode-capacitor structure and a coupled inductor with extended voltage-doubling cell. The proposed converter can achieve high-voltage gain by adjusting the duty cycle and the turns ratio of the coupled inductor, which avoids the circuit operating at the extreme duty cycle. Moreover, a passive clamped circuit is utilised to decrease the voltage stresses on the power devices and absorb the energy of leakage inductance of the coupled inductor to increase voltage gain. Thus, it reduces the conduction losses and alleviates the reverse-recovery problem of diodes. In conclusion, the proposed converter can achieve high-voltage gain and improve efficiency. The operating principle and steady-state analysis of the proposed converter is illustrated in detail in this study. Finally, experimental results of a prototype circuit with input voltage 40 V, output voltage 300 V and output power 200 W are presented to verify the analysis results of the proposed converter.

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

“…A comparison between the presented structure based on some coupled inductor methods and other high step‐up converters is summarized in Table . It can be observed that the introduced converter is attractive than other converters in voltage gain and voltage stress across the main switch(es).…”

Household induction cooking system based on a grid‐connected photovoltaic system

“…For instance, cascade converters are capable of extending the conversion ratio, but at the cost of redundant energy processing and low efficiency [41]. Pure or hybrid switched‐capacitor converters are also eligible choices [42].…”

Single-Switch High Step-Up Zeta Converter Based on Coat Circuit

“…And the isolated converters are preferred when electrical isolation is required. The voltage gain of the cascade converters is the product of the gain of each stage structure, and the ability of high voltage step-up can be easily achieved [9]- [11]. But the efficiency of the system would decrease with multi-stage energy transformation, and there are some problems in the stability of the multi-stage structures.…”