Dual-Active-Bridge Converter Control for Deadtime Loss Compensation
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Solution Overview
Problem
Existing direct-current-to-direct-current converters face inefficiencies and increased thermal energy generation due to varying load conditions, requiring advanced control methods to minimize power loss and thermal dissipation.
Innovation Solution
A dual-active-bridge converter system with a primary and secondary converter, a transformer, and an electronic controller that adjusts modulation frequency and phase angles based on current errors, utilizing a deadtime compensation module to optimize operation and reduce thermal energy generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the converter operates with fixed modulation frequency and phase angle, then the control system is simple, but thermal efficiency deteriorates under varying load conditions
Solution Approach 1:
The patent implements dynamic adjustment of modulation frequency and phase angle based on real-time load conditions. The controller continuously monitors load variations and adapts the operating parameters accordingly, transitioning from a static control system to a dynamic one that optimizes thermal efficiency across different operating points.
Solution Approach 2:
The patent changes key operating parameters (modulation frequency and phase angle) to optimize converter performance. By varying these parameters in response to load changes, the system maintains high thermal efficiency without requiring a fundamentally more complex control architecture.
2Temperature
If elaborate cooling systems are added to handle thermal energy, then thermal management is improved, but device complexity increases
Solution Approach 1:
The patent converts the harmful thermal energy that would require cooling into a beneficial outcome by optimizing the converter's operating parameters to minimize thermal generation in the first place. Through dynamic adjustment of modulation frequency and phase angle, the system reduces power losses and thermal dissipation, turning the thermal management problem into an efficiency optimization opportunity.
3Loss of energy
If modulation frequency is dynamically adjusted, then thermal efficiency is improved, but control complexity increases
Solution Approach 1:
The patent employs feedback control where the controller monitors load conditions and uses this information to adjust modulation frequency and phase angle. This closed-loop approach enables the system to minimize power losses by continuously adapting to changing operating conditions while maintaining manageable control complexity through established control techniques.
Data Source
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AI summary
An electronic controller is configured to provide control signals to the control terminals of the semiconductor switches of the primary converter and the secondary converter based on a commanded current or target output current; the electronic controller is configured to adjust the phase angle(s), between a respective pairs of semiconductor switches of the primary converter and second converter based on a deadtime compensation module responsive to a current error or current difference between the target output current and the observed output current. A low-pass filter facilitates estimation of the current error for compensation in the commanded current.