Non-isolated high step-up DC/DC power converter with coupled-inductor

Area of Science:

• Electrical Engineering
• Power Electronics
• Circuit Design

Background:

• High voltage gain converters are crucial for various power applications.
• Existing designs often involve complex topologies and multiple switches, increasing cost and reducing efficiency.
• Need for efficient and simplified high voltage gain converter solutions.

Purpose of the Study:

• To present a novel non-isolated single-switch converter topology.
• To achieve high voltage gain with improved efficiency and simplified control.
• To validate the converter's performance through theoretical analysis and experimental verification.

Main Methods:

• Integration of coupled-inductor, clamp circuit, and voltage lift capacitor techniques.
• Utilizing a single pulse width modulation (PWM) for the power switch.
• Employing the clamp circuit to circulate leakage inductance energy, suppressing voltage spikes.

Main Results:

• The proposed converter achieves a high voltage gain (48V to 400V).
• Maximum efficiency reached 96.5%, with full load efficiency at 92.3%.
• Demonstrated suppression of voltage spikes on the active switch, improving reliability.

Conclusions:

• The non-isolated single-switch converter offers a simple yet effective solution for high voltage gain applications.
• The integrated clamp circuit significantly enhances efficiency by managing leakage inductance.
• The proposed topology presents a promising alternative for power conversion systems requiring high voltage step-up.