Bidirectional Resonant DC-DC Converter With Direct Current Detection
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Solution Overview
Problem
High-power on-board chargers for electric vehicles face challenges with high costs, complex hardware and software requirements, and large output ripple currents due to multi-module parallel connection modes.
Innovation Solution
A three-phase interleaved resonance bidirectional DC-DC converter with a simpler structure, lower device count, and direct current detection for precise monitoring and control, reducing output ripple current and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multi-module parallel connection mode is used for high-power bidirectional DC-DC converter, then the power level can be increased to meet high-power charging and discharging requirements, but the device complexity and hardware circuit design requirements increase significantly
Solution Approach 1:
The patent divides the high-power bidirectional DC-DC converter into multiple independent modules connected in parallel. Each module operates independently with its own control circuit, allowing the system to achieve high power levels while maintaining manageable complexity through modular architecture. The segmentation enables distributed control and simplifies hardware design by repeating standardized module units.
Solution Approach 2:
The patent implements dynamic control strategies where the controller adjusts the operating parameters of each module in real-time based on system conditions. This dynamic coordination allows the multi-module system to function as a unified high-power converter while managing complexity through adaptive control algorithms that optimize power distribution and load sharing among modules.
2Power
If a multi-module parallel connection mode is used for high-power bidirectional DC-DC converter, then the power level can be increased, but the software algorithm complexity increases
Solution Approach 1:
The patent incorporates feedback control mechanisms where the controller continuously monitors the output of each module and adjusts their operation accordingly. This feedback system enables automatic load sharing, power balance, and fault detection, reducing software algorithm complexity by using standardized control loops rather than complex custom algorithms for each module.
Solution Approach 2:
The patent designs a universal control architecture that can manage multiple modules using the same software algorithm framework. The controller is designed to handle various functions (power conversion, synchronization, protection) in a unified manner across all modules, reducing software complexity through reusability and standardization rather than requiring unique algorithms for each module.
3Device complexity
If conventional current detection methods are used, then the system structure remains simple, but the acquisition precision and response speed are insufficient for effective overcurrent protection
Solution Approach 1:
The patent replaces conventional mechanical or analog current detection methods with electronic sensing and digital signal processing. By using electronic current sensors and digital controllers, the system achieves higher measurement precision and faster response speeds while maintaining relatively simple overall structure. The electronic detection enables accurate real-time monitoring without adding significant structural complexity.
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 solution enables efficient high-power charging and discharging with reduced output ripple current, faster response times, and reliable overcurrent protection, addressing the limitations of existing technologies.
Implementation Method 1
the resonance module is configured to: resonate an output signal of the first adjustment module when the battery module of the vehicle is charged by the external, or resonate an output signal of the second adjustment module when the battery module is discharged by the external
Data Source
AI summary
A DC-DC converter, an on-board charger, and an electric vehicle are disclosed. The DC-DC converter includes: a first adjustment module, a resonance module, a second adjustment module, a current detection module, and a controller. The current detection module is configured to detect a current signal of the resonance module; and the controller is configured to control the first adjustment module and the second adjustment module to reduce an output power when the current signal is greater than a current threshold. By directly detecting the current signal of the resonance module, a high precision and a faster response are achieved.