Bidirectional Resonant Converter With Switchable Resonant Paths
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Solution Overview
Problem
Existing high-power dual-active bridge (DAB) converters face inefficiencies when operated in a wide voltage range due to excessive reactive power and large primary-secondary phase shift angles, leading to low equipment efficiency.
Innovation Solution
A bidirectional resonant converter is designed with resonant branches electrically connected to primary windings of a transformer, forming multiple connection paths. A selection unit chooses one or more paths to create a resonant cavity, allowing for adjustable parameters and efficient energy conversion across a wide voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the high-power DAB converter is operated in a wide voltage range, then the voltage gain is far away from 1, but the reactive power increases and the equipment efficiency is low
Solution Approach 1:
The patent divides the resonant circuit into multiple resonant branches, each with different parameter combinations. By selecting and connecting specific resonant branches based on the operating voltage range, the system segments the overall conversion process into multiple optimized stages, maintaining voltage gain close to 1 in each stage and reducing reactive power accumulation.
Solution Approach 2:
The patent dynamically adjusts the resonant circuit parameters by selecting different resonant branches according to the real-time operating conditions. This dynamic reconfiguration allows the system to adapt to wide voltage ranges while maintaining optimal efficiency and minimizing reactive power at each operating point.
2Power
If the primary-secondary phase shift angle is too large, then the voltage gain can be achieved, but the reactive power increases and efficiency is low
Solution Approach 1:
The patent changes the resonant parameters (inductance and capacitance values) by selecting different resonant branches with optimized parameter combinations. This allows the system to achieve the required voltage gain with smaller phase shift angles, thereby reducing reactive power and improving efficiency.
Solution Approach 2:
The patent segments the voltage conversion task into multiple smaller steps by using different resonant branches for different voltage ranges. Each branch is optimized to operate with voltage gain close to 1, avoiding the need for large phase shift angles and reducing reactive power consumption.
3Productivity
If multiple resonant branches are added to form multiple connection paths, then the efficiency across wide voltage range is improved, but the device complexity increases
Solution Approach 1:
The patent designs resonant branches that can serve multiple functions and be used in different operating conditions. Each resonant branch is configured to handle specific voltage ranges efficiently, and the selection unit dynamically routes the operating current through the appropriate branch, making the system multi-functional without proportionally increasing complexity.
Solution Approach 2:
The patent uses a dynamic selection unit that automatically chooses the optimal resonant branch based on real-time operating conditions. This dynamic control mechanism manages the complexity of multiple resonant branches by providing automated, intelligent routing, reducing the burden on the control system and simplifying the overall operation despite the increased number of components.
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
The proposed bidirectional resonant converter achieves high-efficiency electrical energy conversion by optimizing the resonant cavity parameters based on the operating mode, thereby improving efficiency and reducing reactive power across a wide voltage range.
Implementation Method 1
a resonant cavity between the first switching circuit and the transformer is formed. According to the technology of the present disclosure, the parameters of the resonant cavity are correspondingly changed
Data Source
AI summary
A bidirectional resonant converter includes a first port, a second port, a first circuit, a resonant circuit, a transformer, a second circuit and a selection unit. The transformer includes a plurality of primary windings. The resonant circuit comprise a plurality of resonant branches. Each resonant branch is electrically connected with at least one primary winding. The plurality of resonant branches and the corresponding primary windings are collaboratively formed as a plurality of connection paths. The selection unit is electrically connected with the plurality of connection paths, and selects at least one connection path from the plurality of connection paths. A resonant cavity between the first circuit and the transformer is formed. The resonant cavity is selected according to the working mode, and the parameters of the resonant cavity are correspondingly changed.