Power Supply Circuit for Battery Management System
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Solution Overview
Problem
Existing power storage systems rely on external power for operation, which can lead to instability when external power is unavailable, limiting their ability to function as uninterruptible power supplies during grid failures or power outages.
Innovation Solution
A power storage system with a battery management system (BMS) and power supply circuit that can switch between external power and battery power, ensuring continuous operation by using battery power when external power is not available, and including a converter to match voltage levels and a power switching unit for controlled power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power storage system uses external power for BMS operation, then the system can operate with stable external power supply, but the system becomes unstable when external power is unavailable
Solution Approach 1:
The power supply circuit is designed to accept multiple power sources (external power and battery power) and automatically switch between them. The circuit includes a first power supply path for external power and a second power supply path for battery power, enabling the BMS to operate reliably regardless of external power availability.
Solution Approach 2:
The power supply circuit acts as an intermediary between the power sources (external power and battery) and the BMS. It includes switching mechanisms and voltage regulation components that mediate the power transfer, ensuring the BMS receives stable power from either source without direct exposure to the instability of external power outages.
2Reliability
If the system switches to battery power for BMS operation, then the system can operate during external power failures, but additional power management components are required
Solution Approach 1:
The power supply circuit is segmented into distinct functional modules: a first power supply path for external power, a second power supply path for battery power, a power switching unit for controlling power source selection, and a converter for voltage regulation. This segmentation allows each component to perform a specific function, making the overall complex system manageable and maintainable.
Solution Approach 2:
The power supply circuit incorporates dynamic switching capability through the power switching unit, which can transition between external power and battery power based on real-time conditions. The converter also dynamically adjusts voltage levels to match BMS requirements, enabling the system to adapt to changing power availability without manual intervention.
3Use of energy by moving object
If a converter is used to match voltage levels, then the system can efficiently utilize battery power, but the device complexity increases
Solution Approach 1:
The converter changes the electrical parameter (voltage) of the battery power to match the BMS operating requirements. By adjusting the voltage parameter, the system efficiently utilizes battery power for BMS operation. The converter is integrated into the second power supply path, adding minimal complexity while ensuring proper voltage matching for efficient energy utilization.
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 stable operation of the power storage system by using battery power during external power failures, maintaining system functionality and supporting loads during grid abnormalities.
Implementation Method 1
a converter for reducing an output voltage of the battery
Implementation Method 2
a first diode coupled between an input terminal to which the external power is applied and a power supply terminal of the BMS; a second diode coupled between the converter and the power supply terminal of the BMS
Data Source
AI summary
A power storage system for supplying power to a load by coupling a power generation system, a battery, and a grid, the power storage system includes a battery management system (BMS) for controlling charging and discharging of the battery and a power supply circuit for supplying power to the BMS, wherein the power supply circuit is configured to supply external power to the BMS as an operating power of the BMS in a first state in which the external power is applied, and the power supply circuit is configured to supply power of the battery to the BMS as the operating power of the BMS in a second state in which the external power is not applied.