LLC Resonant Converter Topology Switching for Wide Input Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LLC resonant converters have a limited input voltage range, resulting in a short holding time and the need for a large-volume, high-cost output-end capacitor.
Innovation Solution
An LLC resonant converting apparatus that includes a processor to control the LLC resonant converter to operate in either half-bridge or full-bridge mode based on input voltage, using metal oxide semiconductor field effect transistors and a voltage detector to manage the switching states, thereby extending the input voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional LLC resonant converter is used with a fixed topology, then the circuit structure is simple, but the input voltage range is limited and holding time is short
Solution Approach 1:
The patent implements dynamic topology switching by detecting input voltage levels and automatically selecting between half-bridge and full-bridge modes. The processor monitors voltage conditions and dynamically reconfigures the switching circuit arrangement, allowing the converter to adapt to varying input voltages while maintaining optimal performance across a wide voltage range.
Solution Approach 2:
The patent designs the converter to perform multiple functions through a single unified circuit that can operate in different modes. The same basic LLC resonant converter circuit serves both half-bridge and full-bridge configurations, enabling it to handle both wide voltage ranges (full-bridge mode) and maintain efficiency at higher voltages (half-bridge mode), thus achieving multi-functionality without requiring separate dedicated circuits.
2Duration of action of moving object
If the input voltage range is extended using a larger output-end capacitor, then the holding time increases, but the volume and cost increase
Solution Approach 1:
The patent changes the operational parameters of the converter by switching between half-bridge and full-bridge modes based on input voltage detection. This parameter change allows the system to maintain stable output voltage across different input conditions without requiring excessive energy storage capacity, thereby reducing the needed capacitor size while extending effective holding time through intelligent mode transitions.
3Duration of action of moving object
If the input voltage range is extended using a larger output-end capacitor, then the holding time increases, but the cost increases
Solution Approach 1:
The patent changes the operational parameters of the converter by switching between half-bridge and full-bridge modes based on input voltage detection. This parameter change allows the system to maintain stable output voltage across different input conditions without requiring excessive energy storage capacity, thereby reducing the needed capacitor size and associated costs while maintaining extended holding time capability.
Data Source
AI summary
An LLC resonant converting apparatus determines to operate as a half-bridge LLC resonant converter or a full-bridge LLC resonant converter based on the magnitude of the input voltage. The present disclosure can solve the problem that the input voltage range of the LLC resonant converter is not wide enough.