Barcode Scanner Charger RESU Type Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing barcode scanner chargers fail to differentiate between super-capacitor and lithium-ion battery-based rechargeable energy storage units (RESUs), leading to inappropriate charging processes that can damage the units and require additional mechanical keying features, increasing costs and user frustration.
Innovation Solution
A charger with a detection circuit that measures the terminal resistance at the thermistor pin to determine the type of RESU, using a P-channel MOSFET and analog-to-digital converter to select the appropriate charging process for either super-capacitor or lithium-ion battery-based units, ensuring safe and efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a charger uses a single charging process for all RESU types, then the device complexity is reduced, but the reliability of charging deteriorates due to incompatible charging processes damaging the units
Solution Approach 1:
The charger dynamically adjusts its charging process based on the detected RESU type. The system transitions from a static single charging mode to a dynamic adaptive charging mode where the charging parameters (current, voltage, timing) are modified in real-time based on whether a super-capacitor or lithium-ion battery is detected, resolving the contradiction between simplicity and safety
Solution Approach 2:
The charger changes its operating parameters based on the detected RESU type. For super-capacitors, it applies high current charging with specific timing sequences, while for lithium-ion batteries, it uses controlled constant current/constant voltage charging with temperature monitoring, thus adapting parameters to maintain reliability without requiring complex mechanical differentiation
2Reliability
If mechanical keying features are added to differentiate RESU types, then the reliability of charging is improved, but the ease of manufacture deteriorates due to additional production steps and costs
Solution Approach 1:
The patent replaces mechanical keying features (physical differentiation mechanisms) with an electrical detection system. Instead of using different mechanical shapes, tabs, or keying features on the connectors, the system uses electrical resistance measurement to identify RESU type, significantly simplifying manufacturing while maintaining reliable differentiation
Solution Approach 2:
The thermistor pin serves as an intermediary element that enables electrical detection of RESU type without requiring mechanical differentiation. By measuring the resistance characteristics of this pin, the system can identify whether a super-capacitor or lithium-ion battery is present, providing reliable type identification without adding mechanical complexity to either the RESU or charger
3Reliability
If additional detection circuits are added to identify RESU type, then the reliability of charging is improved, but the device complexity of the charger increases
Solution Approach 1:
The detection circuit performs multiple functions: it measures the resistance of the thermistor pin to identify RESU type, and the same circuitry is used during the charging process to monitor temperature and control charging parameters. This multi-functionality reduces the need for separate dedicated detection components, minimizing the increase in device complexity while improving reliability
Solution Approach 2:
The existing thermistor pin, originally intended solely for temperature monitoring during charging, is repurposed to also serve as the detection element for RESU type identification. This self-service approach allows the same hardware component to perform dual functions, avoiding the need for additional dedicated detection circuits and minimizing complexity increases
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 allows for safe and efficient charging of both super-capacitor and lithium-ion battery-based RESUs without additional mechanical keying, reducing costs and user frustration by automatically adjusting the charging process based on the detected RESU type.
Implementation Method 1
Temperature may be detected by sensing the thermistor's resistance (i.e., the terminal resistance at the thermistor pin) since the thermistor's resistance varies with temperature (e.g., 10K ohms at room temperature)
Data Source
AI summary
Cordless indicia readers may use a rechargeable energy storage unit (RESU) for power. The RESU may include either at least one lithium-ion battery or at least one super capacitor. Problems may arise when an RESU containing a lithium-ion battery is charged using a super-capacitor charging-scheme. The present invention embraces a system and method for charging a barcode scanner that includes determining the RESU type and then charging the RESU with a charging process that is appropriate for the RESU type.