Boost Converter Transient Response Control
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Solution Overview
Problem
Existing boost converters with fast transient response suffer from unwanted oscillation and slow load transient due to the use of fixed coefficients in lookup tables, as seen in Peretz's design, which is inadequate for rapidly changing load conditions in mini-LED backlight panels.
Innovation Solution
A boost converter with an inductor, diode, transistor, and controller that dynamically controls switching based on estimated load current and transient mode, using adaptive transient voltage thresholds and extended lower bounds to prevent oscillation and speed up light-to-heavy load transient responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a lookup table with fixed coefficients is used to control load transient, then the transient response can be controlled, but oscillation occurs which slows down the load transient
Solution Approach 1:
The patent implements dynamic control by transitioning from fixed lookup table coefficients to real-time calculated coefficients based on actual operating conditions. The controller dynamically adjusts the transient voltage threshold and control coefficients according to the current load transient state, enabling the system to adapt to varying conditions and eliminate oscillation while maintaining fast transient response.
Solution Approach 2:
The patent changes the control parameters from fixed values stored in a lookup table to dynamically calculated values. The transient voltage threshold and control coefficients are continuously updated based on real-time measurements of output voltage and load current, allowing the system to optimize performance for each specific transient condition rather than relying on pre-defined fixed parameters.
2Loss of time
If the transient voltage threshold is set too low, then the transient mode can be detected earlier, but oscillation may occur due to premature mode switching
Solution Approach 1:
The patent employs feedback mechanisms where the controller continuously monitors the output voltage and compares it against dynamically adjusted transient voltage thresholds. The system uses feedback from the actual voltage response to determine when to switch modes, ensuring that mode transitions occur only when appropriate conditions are met, thereby preventing oscillation while maintaining timely transient detection.
Solution Approach 2:
The patent prepares control coefficients and transient voltage thresholds in advance through calculations based on expected operating conditions. By pre-calculating appropriate threshold values and control parameters for different transient scenarios, the system can quickly respond to load changes without premature or oscillatory mode switching, as the preliminary prepared parameters are optimized for each specific transient condition.
3Device complexity
If fixed control coefficients are used, then the controller design is simplified, but the transient response cannot adapt to rapidly changing load conditions
Solution Approach 1:
The patent transforms the control approach by changing parameters from fixed to variable. The controller calculates control coefficients and transient voltage thresholds in real-time based on actual operating conditions, enabling the system to adapt to rapidly changing load transient conditions. This parameter change approach maintains reasonable design complexity while dramatically improving adaptability to varying load conditions.
Data Source
AI summary
A boost converter includes an inductor and a diode electrically connected in series between an input voltage and an output voltage; a transistor electrically coupled to an interconnected node of the inductor and the diode; and a controller that controls switching of the transistor according to a transient mode and an estimated load current. The output voltage in a light-to-heavy load transient mode has at least one first valley point with a value of a transient voltage threshold, followed by at least one second valley point with a value higher than the first valley point, before exiting the light-to-heavy load transient mode.