A fixed duty cycle cannot maintain a stable output voltage when the input voltage or load changes. To solve this, we need to design a feedback system.
We walk through the step-by-step process of:
Modeling the Converter: Using a comparator and a triangular wave (carrier) to modulate the duty cycle.
Small Signal Analysis: Adding perturbations to the modulation wave to observe the system response.
Generating the Bode Plot: Analyzing the transfer function from the duty cycle to the output voltage.
This foundational analysis is crucial for designing a stable and responsive closed-loop controller in our next session.
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