Feasibility and Accuracy Analysis of Input Power Estimation for Boost PFC Converter without Additional Sensor

Accurately Estimate Input Power for Your Design

The most commonly used boost PFC converters in the industry only sample input voltage, output voltage, and inductor current, and control the switching frequency and duty cycle. This presentation discusses the feasibility of estimating real-time input power based on this limited information in a boost converter, using the HR1211 as an example. The influences of major non-ideal effects, including turn-on delay, turn-off delay, and current distortion caused by the parasitic oscillation in DCM are analyzed in detail, and an algorithm for accurate estimation is proposed accordingly. In contrast to the power metering implemented by input voltage and current sensors, this study provides an approach to monitor input power without introducing any additional system complexity, cost, or power loss. The feasibility and the correctness of the theoretical analysis have been validated by the experimental results based on a power supply solution in production.

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