Portable Radio UPS With Regulated Voltage and Fast LFP Charging
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Solution Overview
Problem
Existing two-way portable radios have unreliable battery systems that require lengthy charging times and frequent replacements, leading to significant downtime and increased operational costs, especially in mission-critical situations.
Innovation Solution
The development of an uninterruptible power supply (UPS) system with rechargeable lithium iron phosphate (LFP) battery cells that can be charged in minutes, providing a constant regulated voltage independent of the battery's state of charge, allowing for extended runtime and reduced charge cycles, and incorporating an external power source for rapid charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing battery systems are used for two-way radios, then the radio can be powered portably, but the charging time is long (3-4 hours) and operational uptime is limited to 70%
Solution Approach 1:
The patent changes the chemical parameters of the battery system by using lithium iron phosphate (LFP) chemistry with optimized cell configuration and voltage parameters. The system operates at higher voltages (48V nominal) and uses specific charge rate parameters (6C charging capability) to achieve faster charging times of under 10 minutes while maintaining reliability.
Solution Approach 2:
The patent introduces a DC-DC converter as an intermediary device between the power source and battery cells. This converter mediates the power transfer, enabling controlled charging at optimized rates and voltages, which allows rapid charging without compromising battery life or safety.
2Reliability
If existing battery systems are used for two-way radios, then the radio can operate portably, but frequent battery replacements are needed increasing operational costs
Solution Approach 1:
The patent extends battery cycle life by changing operational parameters including using LFP chemistry which naturally provides longer cycle life, operating at optimized voltage ranges (48V nominal system), and controlling charge/discharge rates through the DC-DC converter to prevent degradation.
Solution Approach 2:
The system incorporates intelligent battery management that automatically monitors and manages battery health, state of charge, and charging parameters. The DC-DC converter and control system work together to optimize charging cycles and prevent conditions that would reduce battery life, enabling the system to maintain itself over extended periods.
3Reliability
If existing battery systems are used for two-way radios, then the radio can be powered, but voltage swings and noise issues occur affecting signal quality
Solution Approach 1:
The DC-DC converter acts as an intermediary that isolates the radio from direct battery connections. It provides regulated, clean power output with stable voltage, filtering out noise and preventing voltage swings from reaching the radio, thereby improving signal quality while maintaining portable operation.
Solution Approach 2:
The system changes the electrical parameters by operating at higher voltage (48V nominal) with better regulated output. The DC-DC converter maintains stable output voltage parameters even when battery state of charge varies, reducing voltage swings and associated noise that would degrade radio performance.
4Loss of time
If faster charging is implemented for two-way radios, then operational uptime increases, but battery degradation and safety risks increase
Solution Approach 1:
The DC-DC converter serves as a protective intermediary during charging, controlling the charge rate and voltage to prevent overheating and other safety issues. It enables fast charging (6C rate capability) while monitoring and managing battery conditions to prevent degradation and maintain safety.
Solution Approach 2:
The system uses LFP chemistry which allows higher charge rates with better thermal stability and safety margins. The controlled parameter changes include maintaining optimal voltage and temperature ranges during fast charging, enabling under-10-minute charging while preserving battery lifespan and safety.
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 UPS system significantly increases the operational uptime of two-way radios to 98% by reducing charge time to under 10 minutes, extending battery life, and minimizing downtime, thereby decreasing overall operational costs and improving reliability during critical situations.
Implementation Method 1
The UPS system includes rechargeable battery cells and an uninterruptible power supply (UPS) configured to provide power to the radio
Implementation Method 2
rechargeable battery cells composed of lithium iron phosphate (LFP) or equivalent
Data Source
AI summary
Uninterruptible power supply (UPS) systems and related methods that may be used to supply power to two-way, portable radios are described. The UPS system provides full UPS functionality and a constant output voltage independent of a battery voltage and battery State of Charge (SOC).