A Sensorless Current Balance Control Method for Interleaved Boost Converter

Current balance is essential in high power interleaved boost converter to ensure the function and performance of the converter. It helps to prevent imbalanced heat distribution, inductor saturation and improves the output voltage performance and overall efficiency. A sensorless current control method is proposed in this paper to achieve the balanced phase current. By eliminating the current sensor, the design complexity and system cost can be reduced. This paper analyzes the relationship between the peak value of the output voltage ripple and the phase current status. The sensorless current control method detects and analyzes the difference in the output phase voltages to determine the current sharing status. Adjustment on the control parameters will then take place based on the relationship between the voltage ripple mismatches and current sharing. A simulation model and a two-phase interleaved boost converter prototype have been developed to validate the effectiveness of the proposed method.