Uninterruptible Power Supply Regenerated Power Management
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Solution Overview
Problem
Existing uninterruptible power supply devices face issues when connected to independent power generators, as regenerated power from loads can return to the generator, causing failures.
Innovation Solution
The implementation of an uninterruptible power supply device with a switch, AC bus, first and second power converters, and a control circuit that manages power conversion and storage, preventing the return of regenerated power by charging a power storage device during regeneration and discharging it during power running.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch is turned on to supply AC power from the AC power supply to the load, then the load receives power normally, but regenerated power from the load returns to the AC power supply causing failure
Solution Approach 1:
The patent introduces a power converter as an intermediary device between the load and the AC power supply. This power converter includes a DC-DC converter and an inverter that together form a buffer system. When regenerated power is generated by the load, it is converted to DC power by the power converter and stored in a storage battery, preventing it from returning to the AC power supply. This intermediary mechanism effectively blocks the harmful regenerated power while maintaining normal power supply functionality.
Solution Approach 2:
The patent extracts the regenerated power from the main power supply path by introducing a separate power conversion and storage path. The power converter specifically targets and separates the regenerated power component from the overall power flow, directing it to the storage battery instead of allowing it to return to the AC power supply. This extraction approach isolates the harmful element while preserving the beneficial power transmission.
2Reliability
If a power converter is added to prevent regenerated power return, then the AC power supply is protected, but the device complexity increases
Solution Approach 1:
The power converter designed in the patent serves multiple functions simultaneously: it converts AC power to DC power for the storage battery, converts DC power to AC power for the load, and manages regenerated power from the load. By making the power converter multi-functional, the patent reduces the need for separate dedicated devices for each function, thereby limiting the increase in device complexity while achieving comprehensive power management and protection.
Solution Approach 2:
The patent combines the DC-DC conversion function and the AC-DC inversion function into a single integrated power converter system. Rather than using separate independent converters for each conversion task, the system merges these functions into one unified device that can operate in multiple modes (charging mode, discharging mode, and regenerated power management mode). This merging approach reduces the overall number of components and simplifies the system architecture.
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 solution effectively prevents or reduces the return of regenerated power to the AC power supply, enhancing input efficiency by utilizing the stored power during load operation.
Implementation Method 1
a power converter connected to the load... converts DC power from a DC power supply into AC power and supplies the AC power to the load
Implementation Method 2
The second power converter has a charge mode in which the second power converter converts AC power received from the AC bus into DC power and supplies the DC power to a first power storage device
Implementation Method 3
a discharge mode in which the second power converter converts DC power of the first power storage device into AC power and outputs the AC power to the AC bus
Data Source
AI summary
An uninterruptible power supply device includes a switch, a power converter, and another power converter. The switch includes a first electrode that receives AC power from an AC power supply and a second electrode connected to a load via an AC bus, and is turned on during a normal operation and turned off during a power failure. The power converter converts DC power from a DC power supply into AC power and outputs it to the AC bus during a power failure. The other power converter converts the AC power received from the AC bus into DC power and stores it in a lithium-ion battery when the load is performing regeneration running, and converts the DC power of the lithium-ion battery into AC power and supplies it to the AC bus when the load is performing power running.