UPS Converter Architecture for High-Speed Battery Charging
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Solution Overview
Problem
Conventional uninterruptible power supply apparatuses face challenges in high-speed charging of lithium-ion batteries while maintaining power supply to a load, often leading to DC power shortages or increased costs when using high-capacity systems or external chargers.
Innovation Solution
The apparatus incorporates a fourth power converter that cooperates with the first power converter during high-speed charging, converting AC power to DC power and supplying it to the DC line, alongside existing converters to manage power distribution efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high-capacity uninterruptible power supply apparatus is selected to provide sufficient DC power for high-speed charging, then the power supply capacity is improved, but the cost increases
Solution Approach 1:
The patent applies dynamics by enabling the first power converter to dynamically switch between two operational modes: normal operation mode (converting AC to DC for the DC line) and high-speed charging support mode (cooperating with the fourth power converter to provide additional DC power). This dynamic adaptability allows the system to provide high power capacity only when needed for battery charging, rather than maintaining high capacity continuously, thereby reducing overall system cost while meeting peak power demands.
2Productivity
If an external charger is added to enable high-speed charging of the power storage device, then the charging speed is improved, but the cost increases
Solution Approach 1:
The patent applies universality by designing the fourth power converter as a multi-functional component that serves dual purposes: (1) supporting high-speed charging of the power storage device by providing additional DC power when needed, and (2) maintaining standard power conversion functions during normal operation. This eliminates the need for a separate external charger, as the fourth power converter integrates the high-speed charging capability within the existing UPS system architecture, thereby achieving high charging speed without the additional cost of an external charger.
3Device complexity
If the first power converter operates alone during normal state, then the device complexity is reduced, but the power supply capacity is insufficient for high-speed charging
Solution Approach 1:
The patent applies segmentation by dividing the power conversion function into multiple specialized converters: the first power converter handles standard AC-to-DC conversion for normal operation, while the fourth power converter is specifically dedicated to supporting high-speed charging operations. This segmentation allows each converter to be optimized for its specific function, enabling the system to achieve high DC power generation capacity when needed while keeping the overall system architecture relatively simple and manageable.
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
This configuration prevents DC power shortages during high-speed charging, enabling efficient operation while reducing costs compared to high-capacity systems or external chargers.
Implementation Method 1
the first power converter converts AC power supplied from the AC power supply into DC power and supplies the DC power to a DC line
Implementation Method 2
The second power converter converts the DC power received from the DC line into AC power and supplies the AC power to a load
Implementation Method 3
The third power converter stores the DC power received from the DC line in a power storage device
Data Source
AI summary
An uninterruptible power supply apparatus includes an AC/DC converter that converts AC power supplied from a commercial AC power supply into DC power and supplies the DC power to a DC line, a DC/AC converter that converts the DC power received from the DC line into AC power and supplies the AC power to a load, a DC/DC converter that provides and receives DC power between the DC line and a battery, and a bidirectional converter that, in high-speed charging of the battery, operates in cooperation with the AC/DC converter, converts the AC power supplied from the commercial AC power supply into DC power, and supplies the DC power to the DC line. This can prevent a shortage of DC power during a high-speed charging operation and enables high-speed charging of the battery while supplying rated power to the load.