Battery Current Control Using MOSFET Backflow Prevention
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Solution Overview
Problem
Existing battery systems lack effective mechanisms to control current flow direction, leading to undesired backflow and inefficiencies, particularly in vehicles with regenerative braking systems.
Innovation Solution
Implementing a battery management system that uses power MOSFETs to actively control current flow, preventing backflow by activating specific MOSFETs based on current measurements, and utilizing a DC-DC converter to manage voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional battery systems are used without active current control, then device complexity is reduced, but current flow direction cannot be controlled leading to backflow issues
Solution Approach 1:
The battery management system monitors current flow conditions and automatically activates control switches to prevent backflow. The system serves itself by detecting current direction and state of charge, then autonomously adjusting switch states to maintain proper current flow control without requiring external intervention.
Solution Approach 2:
The battery management system continuously monitors current flow, voltage, and state of charge, then uses this feedback information to control the activation state of MOSFET switches. This closed-loop control ensures that current flow direction is properly managed while preventing backflow, with the system adjusting its behavior based on real-time conditions.
2Reliability
If power MOSFETs are added to control current flow, then current direction control and backflow prevention are improved, but device complexity increases
Solution Approach 1:
The battery management system with MOSFET control switches serves multiple functions: it prevents backflow, controls charging/discharging current direction, monitors battery state of charge, and manages power flow between battery and electrical system. By consolidating these functions into a single integrated system, the patent reduces overall complexity despite adding active control 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
Enhances battery system reliability and efficiency by minimizing backflow and optimizing current direction, thereby improving performance and compatibility with traditional vehicle designs.
Implementation Method 1
Implementing a battery management system that uses power MOSFETs to actively control current flow, preventing backflow by activating specific MOSFETs based on current measurements
Implementation Method 2
utilizing a DC-DC converter to manage voltage levels
Data Source
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AI summary
A battery system may include an energy storage component (14) the couples to an electrical system (42). The battery system may also include a first semiconductor switching device and a second semiconductor switching device (44, 46). The first semiconductor switching device and the second semiconductor switching device (44,46) each selectively couple the energy storage component (14) to the electrical system (42). Additionally, the battery system may include a first diode coupled in parallel with the first semiconductor switching device and a second diode coupled in parallel with the second semiconductor switching device (48,54). Further, the battery system may include a battery management system (36) that controls operation of the first semiconductor switching device and the second semiconductor switching device (44,46) to selectively couple the energy storage component (14) to the electrical system (42). The battery management system may selectively couple the energy storage component (14) to the electrical system based on an output current measurement (64) of the energy storage component (14).