Magnetic Secure Transmission Inductor Current Control
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Solution Overview
Problem
Existing magnetic secure transmission (MST) devices face challenges in reducing power consumption, particularly during data non-transmission periods, which affects the efficiency and battery life of mobile devices used for contactless payments.
Innovation Solution
The implementation of a magnetic secure transmission (MST) system that includes an inductor, a switching circuit, and a control circuit to adjust the current levels in the inductor during data transmission and non-transmission periods, ensuring the inductor emits magnetic pulses only when necessary, thereby reducing power consumption by maintaining current at a constant level or changing it with a constant slope during non-transmission periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the inductor current is continuously adjusted during data non-transmission periods to maintain data readiness, then the device can quickly resume data transmission, but power consumption increases
Solution Approach 1:
The patent applies periodic action by dividing the data non-transmission period into multiple sub-periods with alternating current adjustment patterns. During first sub-periods, the current level is maintained constant to save power, while during second sub-periods, the current level is adjusted to prepare for potential data transmission. This periodic alternation between low-power maintenance mode and transmission-preparation mode reduces overall power consumption while ensuring the device can quickly resume data transmission when needed.
2Reliability
If the inductor current level is maintained high during non-transmission periods to ensure immediate data transmission capability, then transmission readiness is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the inductor current adjustment strategy adaptive rather than static. The control circuit dynamically adjusts the current level based on the specific timing within the non-transmission period and the likelihood of imminent data transmission requests. During early sub-periods when transmission is more likely, the current is adjusted to higher levels for quick resumption. During later sub-periods when transmission is less likely, the current is maintained at lower constant levels to save power, thus dynamically balancing transmission readiness with 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 significantly reduces power consumption by minimizing the root-mean-square (RMS) value of the inductor current during non-transmission periods, extending the battery life of mobile devices and enhancing the efficiency of contactless payment systems.
Implementation Method 1
The control circuit is configured to control the switching circuit to adjust a level of a current in the inductor, such that the inductor emits a magnetic pulse
Data Source
AI summary
A magnetic secure transmission (MST) system includes a switching circuit, an inductor, and a control circuit. The control circuit is configured to control the switching circuit to adjust a level of current in the inductor. The inductor current may be adjusted by a first amount over a data transmission period such that the inductor emits a magnetic pulse including a first magnitude. The inductor current may be kept constant during a first sub-period of a data non-transmission period and may be changed by a second amount at a constant slope during a second sub-period of the data non-transmission period, such that the inductor emits a magnetic pulse including a second magnitude during the second sub-period of the data non-transmission period. The second amount is less than the first amount. The first magnitude is greater than a threshold value. The second magnitude is less than the threshold value.