Battery Module Inverter Topology for Isolated Charge-Discharge Switching
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Solution Overview
Problem
Existing power supply systems based on battery storage struggle to efficiently provide AC voltage to high-power consumers and switch between charging and discharging processes while ensuring galvanic isolation and optimal component sizing.
Innovation Solution
A cascaded multilevel inverter/converter system with battery modules connected in series, using a switching mechanism and bridge circuits to generate AC voltage, and separate charging and discharging paths with tailored filters and relays for efficient power transfer and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two-point or three-point inverters are used to generate AC voltage from DC battery voltage, then AC voltage can be provided to consumers, but thermal losses and device size increase
Solution Approach 1:
The patent divides the battery system into multiple battery modules connected in series, where each module has its own bridge circuit. This segmentation allows independent control of each module, reducing thermal losses by optimizing current paths and enabling more efficient voltage generation compared to traditional two-point or three-point inverters.
2Power
If battery modules are connected in series to provide high supply voltage for high-power consumers, then operating currents and electrical losses are reduced, but device complexity increases
Solution Approach 1:
The bridge circuits in each battery module serve multiple functions: they generate AC voltage, enable galvanic isolation between charging and discharging paths, and facilitate switching between charging and discharging modes. This multi-functionality reduces overall device complexity despite the series connection of multiple modules.
Solution Approach 2:
The switching means acts as an intermediary between the battery modules and the charging/discharging paths, controlling the connection and disconnection of individual modules. This intermediary component simplifies the overall system architecture by providing a centralized control mechanism for managing multiple series-connected modules.
3Adaptability or versatility
If a switching mechanism is implemented to switch between charging and discharging processes, then the power supply system can serve dual purposes, but ensuring galvanic isolation increases device complexity
Solution Approach 1:
The patent combines the galvanic isolation function with the switching mechanism by integrating bridge circuits into each battery module. The bridge circuits inherently provide galvanic isolation while enabling switching between charging and discharging paths, thereby achieving dual functionality without significantly increasing device complexity.
4Loss of energy
If separate charging and discharging paths are used with tailored filters, then power transfer efficiency is optimized, but space requirements increase
Solution Approach 1:
The patent applies tailored filters specifically to the charging and discharging paths where they are most needed for optimizing power transfer efficiency. By localizing the filter application to these specific paths rather than implementing universal filtering across the entire system, space requirements are minimized while maintaining optimal efficiency where it matters most.
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
Enables efficient power supply to high-power consumers with AC voltage, supports both charging and discharging processes, and ensures galvanic isolation and optimal component sizing, reducing thermal losses and space requirements.
Implementation Method 1
each battery module also has an accumulator which can be connected via a bridge circuit of the battery module to the first electrical connection and the second electrical connection
Implementation Method 2
the power supply system has a switching means to which the charging path, the discharging path and the interconnection branch are connected, and wherein the switching means can connect the charging path and/or the discharging path electrically conductively to the interconnection branch
Data Source
AI summary
A power supply system with a large number of battery modules, wherein each battery module has a first electrical connection and a second electrical connection, via which the battery modules are connected in series in an interconnection branch of the power supply system. Each battery module also has an accumulator which can be connected via a bridge circuit of the battery module to the first electrical connection and the second electrical connection, and to a charging path via which the power supply system can be charged, and to a discharging path via which the power supply system can deliver electrical power to a connected consumer. The power supply system has a switching component to which the charging path, the discharging path and the interconnection branch are connected, and wherein the switching component can connect the charging path and/or the discharging path electrically conductively to the interconnection branch.