DC UPS Battery Tap Switching for Output Voltage Regulation
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Solution Overview
Problem
Direct current uninterruptible power supplies (DC UPSs) face challenges in maintaining stable output voltage, often exceeding acceptable limits for sensitive loads due to the need to charge battery banks and provide power simultaneously, leading to potential equipment damage.
Innovation Solution
The system employs an intermediate battery tap connection and a relay to control the output voltage, allowing the entire cell bank to take over in case of battery power failure, ensuring the voltage remains within acceptable limits for the load without the need for a DC/DC converter, thus eliminating power consumption and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the DC UPS charges battery banks while providing power to the load simultaneously, then the power supply capability is improved, but the output voltage exceeds the load allowable limit
Solution Approach 1:
The battery bank is segmented into multiple series-connected battery cells. Instead of connecting the load to the entire battery bank, the system taps into a specific intermediate battery cell to provide the output voltage. This segmentation allows the system to utilize only the necessary voltage portion from the battery bank, enabling simultaneous charging and load供电 without exceeding the load's voltage limit.
Solution Approach 2:
An intermediate battery cell serves as a mediator between the battery bank and the load. By selecting and connecting to a specific intermediate cell rather than the entire battery bank, the system achieves voltage matching for the load while the remaining battery cells can be charged simultaneously, resolving the voltage conflict.
2Stability of the object's composition
If a DC/DC converter is used to regulate voltage, then the voltage stability is improved, but the power consumption and cost increase
Solution Approach 1:
The system extracts and eliminates the DC/DC converter from the architecture by directly tapping into an intermediate battery cell. This removal eliminates the power consumption and cost associated with the converter while maintaining voltage stability through the inherent voltage characteristics of the selected battery cell.
Solution Approach 2:
The battery cell itself provides the voltage regulation function that would otherwise require an active DC/DC converter. By selecting an intermediate battery cell with appropriate voltage characteristics, the system uses the battery's inherent properties to self-regulate the output voltage, eliminating the need for external conversion equipment.
3Power
If the entire cell bank is connected to the load, then the power output is improved, but the voltage exceeds the acceptable limit for sensitive loads
Solution Approach 1:
The system segments the battery bank connection by implementing an intermediate tap point at a specific battery cell. This allows the load to be connected to only the necessary portion of the battery bank voltage, reducing the output voltage to acceptable levels while maintaining adequate power output for the load.
Data Source
AI summary
Disclosed is a system that includes a plurality of battery cells connected in series; a first connection path from an intermediate battery cell of the plurality to an output bus of the system; a second connection path from a last one of the plurality of battery cells to an output bus; a circuit switch installed along the second connection path, the circuit switch configured to open or close the second connection path; and an undervoltage relay in the output bus, wherein the undervoltage relay is set at a threshold voltage, and wherein the undervoltage relay is configured to control the circuit switch when a voltage on the output bus exceeds the threshold voltage or drops below the threshold voltage.