Dual Active Bridge Converter Phase Shift for Light-Load ZVS
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Solution Overview
Problem
Conventional dual active bridge converters struggle to achieve zero voltage switching across a wide range of load conditions, particularly in light load conditions, leading to low efficiency due to limited operating conditions.
Innovation Solution
The implementation of adaptive intra-bridge phase shifting in dual active bridge converters, where the output voltage is sensed to compute a target intra-bridge phase shift, and switch control signals are adjusted based on a time-based switching sequence to compensate for variations in output voltage, enabling zero voltage switching across a wide range of load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional dual active bridge converters operate under fixed switching control, then the device structure remains simple, but the efficiency deteriorates under light load conditions due to inability to achieve zero voltage switching
Solution Approach 1:
The patent implements dynamic intra-bridge phase shifting where the phase shift amount is continuously adjusted based on real-time output voltage feedback. This dynamic control enables the converter to achieve zero voltage switching across varying load conditions, particularly improving light load efficiency without requiring complex hardware modifications
Solution Approach 2:
The control system senses the output voltage and uses this feedback to compute the appropriate target intra-bridge phase shift amount. This closed-loop feedback mechanism automatically adjusts the switching sequence to maintain zero voltage switching conditions, resolving the contradiction between simplicity and efficiency by using intelligent control rather than complex hardware
2Adaptability or versatility
If the intra-bridge phase shift amount is fixed, then the switching control is simple, but the adaptability deteriorates as the converter cannot compensate for output voltage variations under different load conditions
Solution Approach 1:
The system dynamically adjusts the intra-bridge phase shift amount based on sensed output voltage and computed target values. This dynamic adaptability allows the converter to maintain optimal performance across light, medium, and heavy load conditions without requiring multiple hardware configurations
Solution Approach 2:
The patent changes the switching control parameter (intra-bridge phase shift amount) based on operating conditions. By computing and adjusting this parameter dynamically, the system achieves high adaptability to different load conditions while using standard converter hardware, avoiding the need for complex multi-configuration systems
3Productivity
If zero voltage switching is achieved only under specific operating conditions, then the control method remains simple, but the productivity deteriorates due to limited operational efficiency range
Solution Approach 1:
The intra-bridge phase shifting control mechanism serves multiple functions: it enables zero voltage switching under all load conditions, compensates for output voltage variations, and maintains efficient power transfer across the entire operating range. This universal control approach eliminates the need for different control strategies for different operating conditions
Solution Approach 2:
The feedback-based computation of target phase shift amounts enables the system to automatically adapt to any load condition and maintain high efficiency. The continuous sensing and adjustment mechanism ensures zero voltage switching is achieved universally across all operating conditions, significantly improving overall productivity
Data Source
AI summary
Systems and methods for controlling a dual active bridge converter are disclosed herein. An output voltage of a dual active bridge converter is sensed. Based at least in part on the output voltage, a target intra-bridge phase shift amount between two bridges of the dual active bridge converter is computed. A plurality of switch control signals, which are provided to respective switches of the dual active bridge converter, are caused to switch according to a time-based switching sequence based on the target intra-bridge phase shift amount to compensate for variations in the output voltage.