Point-of-Sale Supercapacitor Backup for Transaction Data Integrity
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Solution Overview
Problem
Point of sale (POS) devices face data loss or corruption during power failures due to incomplete write actions when transaction data is being stored, especially in offline transactions, and conventional backup solutions like lithium-ion batteries are costly and unreliable.
Innovation Solution
A POS device uses a supercapacitor to provide backup power, enabling a graceful shutdown by automatically transferring transaction data from volatile to non-volatile memory and shutting down subsystems quickly to prevent data loss, without the need for battery charger and gas gauge circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium-ion batteries are used for backup power, then the POS device can maintain power during outages, but the device complexity and cost increase due to required charger and gas gauge circuits
Solution Approach 1:
The patent extracts and removes the complex battery management circuits (charger and gas gauge) from the backup power system, retaining only the essential energy storage function through a simplified capacitor-based approach that eliminates unnecessary complexity while maintaining core reliability
Solution Approach 2:
The patent replaces expensive, complex lithium-ion batteries with inexpensive capacitors that have shorter discharge durations but sufficient for the critical backup function of completing data writes during power outages, reducing both cost and complexity
2Reliability
If lithium-ion batteries are used for backup power, then the POS device can maintain power during outages, but the reliability decreases due to battery aging, charge loss, and swelling
Solution Approach 1:
The patent employs capacitors with shorter operational lifespans compared to batteries, but these capacitors do not suffer from aging, charge loss, or swelling issues. The shorter duration is sufficient for the critical function of maintaining power during brief outages to complete data writes, thereby achieving reliable backup power without the degradation problems of batteries
3Reliability
If the POS device shuts down quickly to prevent data loss, then data integrity is maintained, but the time available to complete data writes to non-volatile memory is reduced
Solution Approach 1:
The voltage monitor detects power loss conditions in advance and triggers the processor to initiate data write operations to non-volatile memory before the actual power failure occurs. This preliminary action ensures that critical data is saved proactively, maintaining data integrity while allowing sufficient time for the write operation to complete before shutdown
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
Ensures data integrity by completing transaction data writes to non-volatile memory and shutting down the system gracefully within 500 ms, preventing data loss or corruption during power outages, while eliminating the costs and reliability issues associated with lithium-ion batteries.
Implementation Method 1
a supercapacitor to provide power to the processor in response to a loss in power
Data Source
AI summary
A point-of-sale (POS) device may include an input device to receive transaction data, a processor to process the transaction data, a storage memory to store the transaction data, a supercapacitor to provide power to the processor in response to a loss in power, and a voltage monitor to monitor an input voltage to the POS device to identify the loss in power and provide an alert to the processor indicating the loss in power, wherein, in response to the alert, the processor stores the transaction data in the storage memory.