Power Converter Feedback Current Control
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Solution Overview
Problem
Conventional power converters consume excessive power due to continuous feedback current flow throughout the switching period and occupy large circuit areas with external feedback capacitors of high capacitance values.
Innovation Solution
A controller and power converter design where the feedback current flows only during a specific time interval within the switching period, using a feedback sensing circuit and digital feedback signal generator to adjust the output voltage, and integrating small capacitance capacitors within the controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback current flows continuously throughout the entire switching period, then the feedback operation can maintain output voltage stability, but power consumption increases significantly
Solution Approach 1:
The feedback current is transformed from continuous flow to periodic pulsed flow. The controller generates feedback current only during specific intervals within the switching period rather than continuously, achieving both voltage stability and reduced power consumption through this periodic action approach
2Reliability
If feedback capacitor is disposed outside the controller with high capacitance value, then feedback operation can be performed effectively, but circuit area occupied increases
Solution Approach 1:
The feedback capacitor is integrated inside the controller chip rather than being disposed externally. This merging of the capacitor into the controller structure eliminates the need for large external capacitance components, significantly reducing the overall circuit area while maintaining feedback effectiveness
Solution Approach 2:
The feedback capacitor is nested within the controller internal structure. By placing the capacitor inside the controller chip boundaries, the design achieves compact integration where the capacitor becomes part of the controller's internal architecture rather than an external component
Data Source
AI summary
A controller includes a feedback sensing circuit that generates a feedback current during a first time interval in a switching period of a power converter based on an output voltage of the power converter and to generate a digital sensing signal indicative of a duration of the first time interval, and a feedback signal generator that determines a magnitude of the feedback current that flows during the first time interval based on a value of the digital sensing signal and to generate a digital feedback signal based on the determined magnitude of the feedback current. The controller adjusts the output voltage of the power converter in response to the digital feedback signal.