Backup Power Supply Switching for Fast Battery Charging
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Solution Overview
Problem
Existing backup power supply devices face increased charging times due to methods that divide battery units into groups for voltage management, which can lead to interruptions in power supply during failures and inefficient charging.
Innovation Solution
A backup power supply device with first and second battery packs, a charging circuit, and control unit that compares voltages to manage charging and discharging switches, allowing for parallel charging and discharging while maintaining battery voltages within specific limits to prevent interruptions and reduce charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output switch is kept ON at all times to prevent power interruption, then power supply continuity is improved, but battery voltage may exceed load device voltage causing direct application of high voltage to the load
Solution Approach 1:
A voltage comparison circuit is introduced as an intermediary between the battery pack and the load device. This circuit compares the battery voltage with the load device voltage and controls the switch accordingly, enabling the system to maintain power continuity while preventing overvoltage damage through intelligent voltage monitoring and comparison
2Reliability
If battery units are divided into two groups for voltage management, then power supply continuity is ensured, but charging time increases
Solution Approach 1:
The battery pack is segmented into multiple individual battery units, each with its own voltage detection and control circuitry. This segmentation allows the control unit to independently manage charging and discharging for each unit, enabling parallel processing of multiple battery units and significantly reducing overall charging time while maintaining power supply reliability
3Productivity
If a boosting DC/DC converter is added to boost input voltage for full charging, then charging capability is improved, but device complexity increases
Solution Approach 1:
The system employs self-service charging where the battery pack charges itself directly from the power supply without requiring external boosting equipment. The control unit intelligently manages the charging process by detecting battery voltage levels and controlling discharge switches, eliminating the need for complex DC/DC converters while maintaining effective charging capability
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 solution enables uninterrupted power supply during failures and significantly shortens the overall charging time by strategically controlling the charging and discharging of battery packs, ensuring they are fully charged and ready for standby without prolonged interruptions.
Implementation Method 1
first and second battery packs 21, 22 each including a secondary battery cell
Data Source
AI summary
A backup power supply device having a short charging time is provided. The backup power supply device for supplying power when a main power supply is under a power failure includes first and second battery packs connected in parallel, a charging circuit for charging the first and second battery packs, first and second discharging switches for causing the first and second battery packs to discharge to the load device respectively, and a control unit. The control unit compares the battery voltages of the first and second battery packs with an output voltage from the main power supply. The control unit sets the first and second discharging switches to ON when the battery voltages are lower than the output voltage. When the battery voltage of the battery pack exceeds the output voltage of the main power supply due to charging, the control unit sets the first discharging switch and the second discharging switch to OFF. Thereafter, after the first and second battery packs are fully charged, the control unit switches the first and second discharging switches to ON when the battery voltage has dropped to a dischargeable upper limit voltage.