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Control of Power Electronic Converters

T06.1 - State Feedback-Based Digital Voltage Mode Control Design in a Series Capacitor Buck Converter for Fast Transient Performance and Robust Stability

Tuesday, March 24, 2026
8:30 AM - 8:50 AM CT
Location: 217B
Traditional DC–DC converter controls like Voltage Mode Control (VMC) and Current Mode Control (CMC) are widely used but have clear drawbacks. VMC is simple, yet its response is slow, while CMC reacts faster but needs precise current sensing, which increases cost, adds losses, and complicates the design. To overcome these issues, we propose a state-feedback control method for the Series Capacitor Buck (SCB) converter. Instead of relying on current sensors, the method uses only the capacitor voltage and how quickly it changes. Since this change naturally reflects inductor current, the controller still captures system dynamics without extra sensing hardware. The result is a simpler design with fewer components, reduced noise, and much wider bandwidth. Using state-space modeling and carefully tuned feedback, the controller delivers faster settling, smaller overshoot, and more stable operation compared to VMC and CMC. Overall, this approach makes converters both easier to build and quicker to respond, pointing toward a practical and reliable alternative for future high-performance power systems.