UPS Converter Merging AC-DC and DC-DC Stages
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Solution Overview
Problem
Current UPS systems face inefficiencies due to multiple steps of AC to DC and DC to DC conversion, which reduce their performance and efficiency, and are limited to accepting AC input only, requiring large-capacity batteries and multiple conversion stages.
Innovation Solution
A UPS system incorporating multiple converters, including a first converter for converting input power to high-voltage DC, a second converter for isolation and synchronous rectification to low-voltage DC, and a third converter with open-loop control for flexible output adjustment, improving efficiency and reducing system losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple conversion stages (AC/DC and DC/DC) are used in the UPS system, then the power can be converted to required voltage levels, but the conversion efficiency decreases and system losses increase
Solution Approach 1:
The patent combines the AC/DC conversion and DC/DC conversion into a single integrated converter unit. This merged converter performs both functions in one device, eliminating the energy losses associated with multiple separate conversion stages while maintaining the capability to convert AC input to the required DC output voltage levels.
Solution Approach 2:
The integrated converter is designed to perform multiple functions: it can convert AC to DC, perform DC/DC voltage conversion, and provide isolation between input and output. This multi-functional design eliminates the need for separate dedicated converters for each function, reducing overall system losses.
2Device complexity
If the UPS system accepts only AC input, then the power conversion can be simplified, but the adaptability to different power sources is limited
Solution Approach 1:
The input interface of the UPS system is designed to accept multiple types of power sources including AC power, DC power from batteries, and power from other UPS units. The integrated converter is capable of handling different input types and converting them to the required output voltage, providing universal adaptability without significantly increasing system complexity.
3Reliability
If large-capacity batteries are used for power storage, then the uninterrupted power supply capability is improved, but the system size and cost increase
Solution Approach 1:
The patent integrates the battery storage function directly into the converter unit, combining the power conversion and energy storage functions in one compact system. This integration allows for more efficient space utilization and reduces the overall system volume compared to separate battery banks.
Solution Approach 2:
The system enables power sharing and energy transfer between multiple UPS units through the integrated converter, adding a dimensional aspect of inter-unit energy exchange. This allows smaller individual battery capacities to achieve the same overall reliability through coordinated operation of multiple units.
4Power
If several steps of conversion from AC to DC and DC to DC are implemented, then the voltage can be adjusted to required levels, but the UPS efficiency is reduced
Solution Approach 1:
The patent merges the AC/DC rectification and DC/DC voltage conversion functions into a single integrated converter stage. This eliminates the intermediate DC bus and reduces the number of switching operations, thereby improving overall UPS efficiency while maintaining full voltage adjustment capability from AC input to DC output.
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
The proposed UPS system enhances efficiency by minimizing conversion stages, improving power factor correction, and providing flexible voltage adjustment, thus enhancing the overall performance and reliability of the power supply to servers.
Implementation Method 1
a first converter (11), having a first input terminal (IN1) for receiving a first power source and a first output terminal for outputting a first voltage
Implementation Method 2
a second converter (12) having a second input terminal electrically connected to the first output terminal and the third output terminal, and a second output terminal for outputting a second voltage
Data Source
AI summary
The present invention provides an uninterruptible power system (UPS), the UPS comprising: a first converter having a first input terminal for receiving a first power source and a first output terminal for outputting a first voltage, wherein the first power source is a DC power or AC power and the first voltage is a DC voltage; a third converter having a third input terminal for receiving the second power source and the third output terminal connected to the first output terminal, wherein the second power source is a DC power; and a second converter having a second input terminal connected to the first output terminal and the third output terminal, and the second output terminal for outputting a second voltage corresponding to the first voltage.