Improved Triple-Switch Triple Mode DC-DC Converter With Suppressed Voltage Oscillations

Triple switch, triple mode (TSTM) dc-dc converters find extensive utilization in renewable energy applications. Unlike other dc-dc converters, TSTM converters operate with two duty cycles (d, d₁), achieving maximum power point tracking (MPPT) and output voltage regulation simultaneously. However, these converters often exhibit high voltage stress on the switches due to resonance caused by mismatched switch/inductor parameters. This article proposes a new TSTM dc-dc converter for high voltage gain with low voltage stress. The advantages of the proposed converter include the following: 1) elimination of resonance due to parameters mismatch, resulting in the suppression of voltage oscillations, 2) flexibility to regulate the output voltage with two duty cycles, and 3) high voltage gain over a wide range of duty cycles. The article provides a detailed explanation of the converter topology, working principle, steady-state analysis, external characteristics, and closed-loop controller design. The design guidelines and performance comparison are also presented. A 460-W laboratory setup is built, and experimental verification is conducted for the voltage conversion from 24 to 272 V.