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The sample and hold effect, or quasi-digital (discrete) behaviour, of constant-frequency peak current-mode control (PCM) is pulse-width modulated DC-DC converters is presented in a manner consistent with the physical behaviour of the circuit. This approach develops a transfer function using control theory that captures the quasi-digital behaviour encountered when the current control loop is closed in PCM. The new transfer function accurately captures the current loop behaviour, leading the way for a compete linear time-variant system circuit for PWM DC-DC converters. This work improves upon previous derivations by remaining true to the physical behaviour of the circuit while resulting in a rational transfer function that can be used in a multiple loop complete linear system circuit to accurately predict converter behaviour due to changes in input voltage, output current, and reference voltage.
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on (Volume:5 )
Date of Conference: 23-26 May 2004