Power Converter Voltage Control Using Load-Transient Slew Rate
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Solution Overview
Problem
Power converters face challenges in efficiently regulating output voltage during load transients, leading to voltage overshoot and undershoot, which can exceed permitted limits, and existing solutions either reduce efficiency or increase system cost.
Innovation Solution
The method involves estimating or calculating the slew rate of the output voltage or error voltage during a load transient and modifying the regulation accordingly, allowing quicker reaction to transients without requiring additional output capacitors or higher switching frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If higher switching frequency is used to reduce output voltage overshoot, then voltage regulation precision is improved, but efficiency deteriorates
Solution Approach 1:
The patent estimates the slew rate of the output voltage or error voltage in advance during load transients, enabling the controller to predict and prepare for upcoming voltage deviations before they occur. This preliminary action allows the system to take corrective measures proactively, reducing the need for high switching frequency adjustments and thereby maintaining efficiency while achieving precise voltage regulation.
2Stability of the object's composition
If more output capacitors are added to reduce voltage undershoot or overshoot, then voltage stability is improved, but system cost and area increase
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors the error voltage and estimates its slew rate. Based on this real-time feedback, the controller dynamically adjusts the power converter's operation to counteract voltage deviations during load transients. This active feedback control achieves voltage stability without requiring additional output capacitors, thereby avoiding increased system cost and area.
3Ease of operation
If conventional threshold-based detection is used to detect voltage deviations, then detection simplicity is maintained, but response speed deteriorates
Solution Approach 1:
The patent changes the detection parameter from simple voltage threshold to slew rate estimation of the error voltage. By calculating the rate of change of the error voltage, the system can detect upcoming deviations earlier and respond more quickly. This parameter change maintains operational simplicity through automated calculation while significantly improving response speed during load transients.
Data Source
AI summary
A controller for a power converter includes: an estimator configured to estimate or calculate a slew rate of an output voltage of the power converter or a slew rate of an error voltage which corresponds to a difference between the output voltage and a target voltage, during a load transient; and a modulator configured to modify regulation of the output voltage based on the estimated or calculated slew rate. A corresponding voltage regulation method and an electronic system that includes the power converter are also described.