Integrated Bidirectional Charger for Split Battery Power Balancing
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Solution Overview
Problem
Existing battery chargers for electric vehicles often have inefficiencies due to their fixed configurations, which may not optimize power transfer across varying power requirements and battery voltages.
Innovation Solution
A configurable DC-DC converter system that includes multiple buck-boost converters for high and low voltage batteries, along with transformers and bridge rectifiers, allowing for flexible operation modes such as full charging, balanced charging, and fault-based operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed configuration battery charger is used, then the device complexity is reduced, but the adaptability to different power requirements and battery voltages deteriorates
Solution Approach 1:
The patent implements a configurable DC-DC converter that can dynamically change its operation mode based on real-time power requirements and battery states. The converter can switch between full charging mode, balanced charging mode, and fault-based operation modes, allowing the system to adapt to different scenarios without requiring multiple fixed chargers.
Solution Approach 2:
The DC-DC converter is designed with multi-functionality to handle various charging scenarios. It can charge multiple high voltage batteries and low voltage batteries simultaneously or individually, support different charging modes (full charging, balanced charging), and respond to different fault conditions, making it a universal charging solution.
2Adaptability or versatility
If a configurable DC-DC converter system with multiple buck-boost converters is used, then the adaptability to different battery configurations is improved, but the device complexity increases
Solution Approach 1:
The charging system is segmented into multiple independent buck-boost converters, each capable of charging specific batteries. The system includes first and second high voltage buck-boost converters for different high voltage batteries, and first and second low voltage buck-boost converters for different low voltage batteries. This segmentation allows flexible configuration while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces a controller as an intermediary that manages the complexity of coordinating multiple converters. The controller receives information about battery states and power requirements, then automatically configures the appropriate converters and charging modes, shielding users from the underlying system complexity while providing flexible adaptability.
3Use of energy by moving object
If fixed operation modes are used in battery chargers, then the ease of operation is improved, but the efficiency under varying power requirements deteriorates
Solution Approach 1:
The system implements feedback mechanisms where the controller continuously monitors battery states, power requirements, and operating conditions. Based on this feedback, the controller automatically adjusts the charging mode and converter configuration to optimize efficiency. The system can detect faults and adapt operations accordingly, maintaining high efficiency without requiring manual intervention.
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 system achieves high efficiency and flexibility in charging multiple batteries by optimizing power transfer and allowing for adaptive operation based on battery states and power requirements.
Implementation Method 1
an alternating current (AC) to direct current (DC) converter (AC-DC converter), the AC-DC converter connectable to a line voltage
Implementation Method 2
one or more transformers having a primary side connected to the AC-DC converter and a secondary side connected to each of a primary side of the first high voltage buck-boost converter
Implementation Method 3
a first high voltage bridge rectifier connected to the secondary side of the one or more transformers and the primary side of the first high voltage buck-boost converter
Data Source
AI summary
A system includes: an AC-DC converter; and a DC-DC converter, the DC-DC converter including: a first high voltage buck-boost converter having a secondary side connectable to a first high voltage battery; a second high voltage buck-boost converter having a secondary side connectable to a second high voltage battery; a first low voltage buck-boost converter having a secondary side connectable to a first low voltage battery; a second low voltage buck-boost converter having a secondary side connectable to a second low voltage battery; and one or more transformers having a primary side connected to the AC-DC converter and a secondary side connected to each of a primary side of the first high voltage buck-boost converter, a primary side of the second high voltage buck-boost converter, a primary side of the first low voltage buck-boost converter, and a primary side of the second low voltage buck-boost converter.