Efficient Battery Backup System for Reliable Power Supply
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Summary
Problems
Conventional UPS systems face inefficiencies and increased complexity due to the wide operational voltage range of the DC bus, which is amplified by high discharge rate batteries like lead-acid or lithium-ion, leading to reduced power efficiency and higher costs.
Innovation solutions
A UPS system with a driver circuit that separates charging and discharging paths for the battery module, allowing the DC bus voltage to operate within a narrower range than the battery voltage, using a charging current regulator and boost circuit to control the battery voltage during charging and discharging phases.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the backup battery operates at a high discharge rate to ensure continuous power supply during AC disruption, then the reliability of power supply is improved, but the DC bus voltage drops significantly, requiring a wide operational voltage range which reduces power efficiency and increases system complexity
Why choose this principle:
The patent segments the battery module into multiple individual battery cells (e.g., 5 cells in series for 58.4V nominal voltage). This segmentation allows each cell to operate within a narrow voltage range while the series combination provides the necessary total voltage, reducing the relative voltage drop during discharge and eliminating the need for a wide DC bus voltage range.
Principle concept:
If the backup battery operates at a high discharge rate to ensure continuous power supply during AC disruption, then the reliability of power supply is improved, but the DC bus voltage drops significantly, requiring a wide operational voltage range which reduces power efficiency and increases system complexity
Why choose this principle:
The patent changes the voltage parameter by operating the battery module at a higher nominal voltage (58.4V from 5 series-connected lithium-ion cells) compared to conventional single-cell or low-voltage configurations. This parameter change reduces the percentage voltage drop during discharge, maintaining more stable DC bus voltage and improving power efficiency without requiring wide voltage range support.
Application Domain
Data Source
AI summary:
A UPS system with a driver circuit that separates charging and discharging paths for the battery module, allowing the DC bus voltage to operate within a narrower range than the battery voltage, using a charging current regulator and boost circuit to control the battery voltage during charging and discharging phases.
Abstract
Methods and systems supply uninterrupted power to a load using a backup battery module. A driver circuit connects the load and the backup battery module such that the operational range of the load voltage is narrower than the operational range of the battery voltage. Different charging and discharging paths of the driver circuit may be used to limit the DC bus voltage to values lower than the battery voltage. The proposed systems and methods can increase power efficiency and decrease the cost of power supply and conversion operations.