Dual-Purpose Battery UPS Rectifier Topology
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Solution Overview
Problem
Existing UPS systems with three-level battery boost converters are costly and complex due to the need for an additional battery boost converter, which adds expense and complexity while the rectifier is unused during battery operation.
Innovation Solution
A dual-purpose battery connection arrangement that utilizes the same batteries for both normal operation and battery mode, eliminating the need for an expensive battery boost converter by using thyristors to interconnect the utility line or battery to the rectifier, and providing a soft-start and utility disconnect feature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-level battery boost converter is added to the UPS system, then power factor correction and utility power quality improvement are achieved, but system complexity and cost increase
Solution Approach 1:
The existing battery module is made multi-functional by configuring it to operate as a battery boost converter during normal operation. The battery module serves dual purposes: as a power source during interruptions and as a boost converter for power factor correction during normal operation, eliminating the need for a separate three-level battery boost converter.
Solution Approach 2:
The functionality of the battery module is merged with the battery boost converter function. By connecting the battery module to the rectifier input and controlling its operation, the patent combines two separate functions (battery backup and power factor correction) into a single integrated system, reducing overall complexity.
2Adaptability or versatility
If a three-level battery boost converter is added to the UPS system, then utility power quality and power factor are improved, but system cost increases
Solution Approach 1:
The battery module is designed to perform multiple functions: serving as both the backup power source and the boost converter for power factor correction. This eliminates the need to manufacture and install an additional three-level battery boost converter, thereby reducing system cost while maintaining power quality improvement capabilities.
Solution Approach 2:
The battery module serves itself by providing both backup power and power factor correction functions. During normal operation, it automatically functions as a boost converter to improve power quality, and during interruptions, it seamlessly switches to providing backup power, eliminating the need for separate dedicated components.
3Power
If a separate battery boost converter is used, then battery voltage is boosted during normal operation, but the rectifier becomes unused during battery mode operation
Solution Approach 1:
The battery module is configured to perform voltage boosting through the rectifier during normal operation. During battery mode, the same battery module continues to function by providing power through the inverter, ensuring continuous utilization of the battery system without leaving the rectifier completely unused, as it can still charge the battery when available power is present.
Data Source
AI summary
An uninterruptible power supply (UPS) system includes a rectifier having inputs connectable to an input AC power line to receive AC power therefrom. The output of the rectifier is connected to the input of an inverter. A dual-purpose battery is connected to function as a battery boost when the rectifier is receiving AC power from the AC power line. If the UPS is switched to operate in battery mode, the battery provides input voltage to the inverter when the rectifier is not receiving AC power from the AC power source.