Current-Source-Mode DC-DC Converter with Ripple-Based Control: Concept, Modeling and Duality Principle

The fundamental current-source-mode (CSM) dc-dc converters and their corresponding power conversion systems have been proposed as effective solutions for constant current drive applications. However, the full potential of CSM converters remains largely untapped due to the lack of advanced control strategies. Widely adopted ripple-based control methods for voltage-source-mode (VSM) dc-dc converters can provide valuable control references for CSM converters. This work revisits the derivation of CSM converters and proposes a ripple based control for CSM converters (denoted as I2 control), leveraging the circuit duality principle. Through frequencydomain modeling based on describing function, this work reveals the duality between I2 control for CSM converters and the well-known V2 control for VSM converters, highlighting their stability regions in terms of the duty cycle and circuit parameters. Experimental results validate the stability region of I2 control and demonstrate its significantly faster dynamic response compared to the control methods without ripple information, for example, proportional-integral (PI) control and model predictive control (MPC).