DAB Converter Phase Control for Inductance Variation
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Solution Overview
Problem
DAB converters experience a decrease in transmission efficiency due to individual differences in inductance, which existing technologies struggle to inhibit effectively.
Innovation Solution
A DAB converter design that includes a transformer with a primary-side and secondary-side winding, two full bridge circuits, capacitors, and a control unit that adjusts the phase difference between the switching of the full bridge circuits based on an estimated inductance value to maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a DAB converter uses a transformer with primary-side and secondary-side windings and two full bridge circuits, then power transmission capability is improved, but transmission efficiency decreases due to individual differences in inductance
Solution Approach 1:
The patent applies dynamics by making the switching phase difference adjustable rather than fixed. The control unit dynamically changes the phase difference between the first and second full bridge circuits based on the estimated inductance value, allowing the system to adapt to individual inductance variations and maintain optimal transmission efficiency.
Solution Approach 2:
The patent changes the operating parameter (phase difference) based on the measured inductance value. By estimating the actual inductance and adjusting the phase difference accordingly, the system compensates for individual differences in inductance and prevents transmission efficiency degradation.
2Adaptability or versatility
If the inductance of the DAB converter varies due to individual differences, then manufacturing flexibility is improved, but transmission efficiency decreases
Solution Approach 1:
The patent implements feedback by estimating the actual inductance value of the DAB converter and using this information to adjust the switching phase difference. The control unit continuously monitors and adapts the operating parameters based on the measured inductance, creating a closed-loop control system that maintains efficiency despite inductance variations.
Solution Approach 2:
The patent performs preliminary estimation of the inductance value before normal operation to determine the optimal phase difference. This preliminary action allows the system to pre-adjust the switching parameters to match the actual inductance, preventing efficiency loss from the outset.
3Device complexity
If the phase difference between full bridge circuits is fixed, then device complexity is reduced, but transmission efficiency cannot be maintained under inductance variations
Solution Approach 1:
The patent applies self-service by enabling the DAB converter to automatically estimate its own inductance value and adjust its own switching phase difference without external intervention. The control unit performs self-diagnosis and self-adjustment, maintaining transmission efficiency through autonomous adaptation to inductance variations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively inhibits the decrease in transmission efficiency caused by inductance differences, ensuring stable power transmission.
Implementation Method 1
a transformer having a primary-side winding and a secondary-side winding
Data Source
AI summary
A DAB converter that is capable of inhibiting a decrease in the transmission efficiency of electric power due to an individual difference of the inductance. A DAB converter including: a transformer having a primary-side winding and a secondary-side winding; a first and second full bridge circuit; a first and second capacitor; and a control unit, in which, the primary and secondary side winding is connected between a midpoint and a midpoint of the first full bridge circuit, the first capacitor is connected between two input/output terminals included in the first full bridge circuit, the second capacitor is connected between two input/output terminals included in the second full bridge circuit, and the control unit configured to adjust a phase difference between the switching of the first and second full bridge circuit based on an estimated value of an inductance of the DAB converter.