Modelagem do conversor CC-CC boost ATCT-CCQE pelo método do conversor boost equivalente

Abstract

This work models a non-isolated DC-DC Boost converter with a wide conversion range (WCR) and a four-state switching cell (4SSC). The classic DC-DC Boost converter is defined as the equivalent model, and the main conventional modeling techniques from power electronics literature are evaluated to select the most appropriate one. To find the equivalent converter in the specified operating region, energy storage intervals in the inductor are defined, leading to the determination of the equivalent switching frequency and duty cycle. Subsequently, the parameters of the equivalent converter are defined, including power supply, storage inductance, capacitances, and load resistance. Using the obtained equivalent model, concepts from PWM small-signal modeling techniques are applied to derive transfer functions. The analytically modeled transfer functions are compared with those of the WCR-4SSC Boost converter, obtained through simulation and experimental testing. This comparison seeks to validate the transfer functions for potential control applications. For simulation design and validation, the converter specifications are Vin= 86 V, Po= 3 kW, Vout= 400 V e f s= 35 kHz, while the transfer function verification in the test bench operates at 33% of the output power. In conclusion, the theoretical validation of the transfer functions demonstrates significant accuracy compared to the WCR-4SSC Boost converter, despite limitations in the experimental validation method for capturing comparative curves.