A Sensorless Current Balance Control Method for Interleaved Boost Converters Based on Output Voltage Ripple

In this article, a sensorless current balance control method for a multiple-phase interleaved boost converter is proposed. Balanced current can help an interleaved boost converter prevent imbalanced heat distribution and inductor saturation as well as improving the output voltage performance and overall system efficiency. This article analyzes the relationship equations between the periodic output voltage ripple and the phase current balance status. In the proposed method, the current sensor is eliminated, and only one voltage sensor on the output capacitor side is needed to monitor the output voltage information. The proposed sensorless current control method estimates the phase current distribution status according to the periodic output voltage peak ripple value and adjusts the phase current distribution status by changing the gate drive signal duty cycle of each phase MOSFET. To validate the proposed method, a PSIM simulation model and a two-phase interleaved boost converter test bench are set up, and the experiment waveforms verify the effectiveness of the proposed method.