Card Reader Power Control via Periodic Unit Scheduling
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Solution Overview
Problem
Card readers experience high instantaneous power consumption when multiple power-consuming units, such as the shutter driving unit, roller driving unit, and interference magnetic field generation unit, operate simultaneously, leading to peak power consumption.
Innovation Solution
A card reader with a control unit that operates these units at different drive powers, ensuring that the periods of maximum power consumption do not overlap, thereby reducing overall power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple units (shutter driving unit, roller driving unit, interference magnetic field generation unit) operate simultaneously at maximum power, then the card reader can perform all functions effectively, but the instantaneous power consumption becomes excessively large
Solution Approach 1:
The control unit schedules the operation of multiple power-consuming units in periodic time slots, ensuring that units operating at maximum power do not run simultaneously. The shutter driving unit, roller driving unit, and interference magnetic field generation unit are activated in sequence rather than concurrently, creating a periodic operation pattern that distributes peak power demands across different time periods.
Solution Approach 2:
The system dynamically adjusts the operation timing of each unit based on real-time power consumption considerations. The control unit monitors and coordinates the activation of different units, changing their operational states dynamically to avoid simultaneous maximum power draw while ensuring all necessary functions are performed during the card reading process.
2Ease of operation
If the shutter driving unit and roller driving unit operate at maximum power simultaneously, then card conveyance and shutter control are effective, but power consumption peaks increase
Solution Approach 1:
The control unit implements periodic operation scheduling where the shutter driving unit and roller driving unit are activated in alternating time slots. When the shutter driving unit operates at maximum power to close or open the shutter, the roller driving unit operates at reduced power or remains idle, and vice versa, creating a periodic pattern that prevents simultaneous peak power consumption.
3Reliability
If the interference magnetic field generation unit operates continuously at maximum power, then crime prevention through skimming protection is effective, but overall power consumption increases
Solution Approach 1:
The interference magnetic field generation unit operates in periodic pulses rather than continuously. The control unit activates the interference magnetic field at maximum power only during critical periods when card data reading or writing is occurring, and reduces or stops operation during idle periods, maintaining security effectiveness while significantly reducing overall power consumption.
Solution Approach 2:
The control unit dynamically changes the power parameter of the interference magnetic field generation unit based on operational needs. During card data processing, the unit operates at maximum power to ensure security; during idle periods or when security threats are not detected, the power level is reduced, optimizing the balance between security effectiveness and power consumption.
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
This approach effectively suppresses the increase in instantaneous power consumption while maintaining effective operation of the units, including crime prevention through secure interference magnetic field generation.
Implementation Method 1
an interference magnetic field generation unit as a measure against skimming
Data Source
AI summary
A card reader which reads information recorded on a card may include a plurality of units having overlapping operation periods; and a control unit structured to operate each of the plurality of units by a plurality of drive powers. The control unit may be configured to control the plurality of units so that periods in which the drive powers of each of the plurality of units are maximum do not overlap.