LLC Resonant Converter Layout Without Secondary Resonant Components
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Solution Overview
Problem
Existing LLC resonance conversion circuits for two-way charging piles in electric vehicles have complex structures, leading to poor control, high costs, and bulky sizes due to the need for resonance capacitors and inductors on both the primary and secondary sides.
Innovation Solution
The LLC resonance conversion circuit redesigns the circuit architecture to simplify control and reduce size and cost by eliminating resonance capacitors and inductors on the secondary side, utilizing a primary side network with switch elements, transformers, and secondary side networks connected directly to the coils, with optional series connections for the resonance capacitors and inductors on the primary side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resonance capacitors and inductors are equipped on both primary and secondary sides, then the LLC resonance conversion circuit can achieve two-way charging function, but the circuit structure becomes complex and bulky
Solution Approach 1:
The patent extracts and removes the resonance capacitor and resonance inductor from the secondary side of the LLC resonance conversion circuit. By taking out these components only from the secondary side while keeping them on the primary side, the circuit achieves two-way charging functionality with reduced complexity and smaller size on the secondary side.
2Adaptability or versatility
If resonance capacitors and inductors are equipped on both primary and secondary sides, then the LLC resonance conversion circuit can achieve two-way charging function, but the cost increases
Solution Approach 1:
The patent removes the resonance capacitor and resonance inductor from the secondary side, thereby reducing the bill of materials and manufacturing cost. The extraction principle directly addresses the cost issue by eliminating unnecessary components while preserving the essential two-way charging capability through the primary side resonance circuit.
3Adaptability or versatility
If resonance capacitors and inductors are equipped on both primary and secondary sides, then the LLC resonance conversion circuit can achieve two-way charging function, but the size becomes bulky
Solution Approach 1:
The patent extracts the resonance capacitor and resonance inductor from the secondary side, directly reducing the volume and physical size of the secondary side circuit. This extraction eliminates the need for large magnetic components and capacitors on the secondary side, resulting in a more compact overall circuit design.
4Adaptability or versatility
If resonance capacitors and inductors are equipped on both primary and secondary sides, then the LLC resonance conversion circuit can achieve two-way charging function, but the control performance deteriorates
Solution Approach 1:
The patent removes the resonance capacitor and resonance inductor from the secondary side, simplifying the control architecture. By eliminating the secondary side resonance components, the control system only needs to manage the primary side resonance circuit, reducing the complexity of control algorithms and improving overall control performance.
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 redesign enhances control ease and reduces the overall size and cost of the conversion circuit while maintaining efficient operation.
Implementation Method 1
The transformer includes at least one coil and at least one excitation inductor
Implementation Method 2
The primary side resonance circuit includes at least one resonance capacitor, at least one resonance inductor
Data Source
AI summary
An LLC resonance conversion circuit is provided. The LLC resonance conversion circuit includes a primary side network, a transformer, a primary side resonance circuit and a secondary side network. The transformer includes at least on coil and at least one excitation inductor. The primary side network includes a plurality of switch elements and an input capacitor. The primary resonance circuit includes at least one resonance capacitor, at least one resonance inductor and at least one auxiliary inductance. The resonance capacitor and the resonance inductor are connected in series between the coil and the primary side network. Two terminals of the excitation inductor are connected to the coil. The auxiliary inductance is connected to the resonance inductor. The secondary side network includes a plurality of switch elements and an output capacitor. The secondary network is connected to the coil.