On-Off Apparatus for Smart Card Coil Isolation
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Solution Overview
Problem
In smart cards, the integration of power consumption components beyond the chip circuit, such as display screens, requires a power acquisition circuit, but sharing a common coil for communication and power acquisition leads to suboptimal efficiency and complicates circuit design, necessitating a method to disconnect the radio frequency carrier between the coil and the chip.
Innovation Solution
An on-off apparatus with AC input and output ends, DC isolating components, and a control module that turns on or off paths between the coil and the chip, allowing the coil to be connected or disconnected from the chip, enabling efficient power acquisition and communication by isolating DC signals and controlling AC signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common coil is used for both communication and power acquisition, then device complexity is reduced, but power acquisition efficiency deteriorates
Solution Approach 1:
The patent segments the coil system into two independent coils: a first coil dedicated to communication and a second coil dedicated to power acquisition. This segmentation allows each coil to be optimized for its specific function, resolving the contradiction between device simplicity and power acquisition efficiency by eliminating the interference that occurs when a single coil must serve dual purposes.
Solution Approach 2:
The patent extracts the power acquisition function from the communication coil by introducing a separate second coil for power acquisition. This extraction allows the first coil to focus solely on communication while the second coil handles power acquisition, thereby resolving the efficiency loss that occurs when a common coil is used for both functions.
2Loss of energy
If a power acquirement coil is added, then power acquisition efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the power acquisition coil with the existing communication coil structure, using the same physical space and design approach for both coils. This merging strategy allows the system to achieve improved power acquisition efficiency while minimizing the increase in device complexity and cost by leveraging the existing coil framework.
3Loss of energy
If a power acquirement coil is added, then power acquisition efficiency is improved, but communication reliability deteriorates
Solution Approach 1:
The patent segments the electromagnetic field functions by dedicating the first coil to communication and the second coil to power acquisition. This spatial and functional segmentation prevents the interference and signal disruption that would occur with a shared coil, thereby maintaining communication reliability while improving power acquisition efficiency.
4Device complexity
If a common coil is used for communication and power acquisition, then device complexity is reduced, but communication reliability deteriorates
Solution Approach 1:
The patent segments the coil system into separate communication and power acquisition coils, eliminating the signal interference and carrier disruption that occur when a single coil is used for both functions. This segmentation maintains simple device architecture while preserving communication reliability by dedicating the first coil exclusively to communication tasks.
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 solution allows for efficient power acquisition and communication in smart cards by isolating DC signals and controlling AC signal transmission, enhancing power acquisition efficiency and simplifying circuit design while maintaining communication integrity.
Implementation Method 1
The first DC isolating component is configured to isolate a DC signal between the first pin and the AC input end and to transmit an AC signal between the first pin and the AC input end
Implementation Method 2
The second DC isolating component is configured to isolate a DC signal between the second pin and the AC output end and to transmit an AC signal between the second pin and the AC output end
Implementation Method 3
The on-off module is configured to turn on or off a path between the third pin and the fourth pin under control of the control signal. When the path between the third pin and the fourth pin is turned on, a path between the first pin and the second pin is turned on
Data Source
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AI summary
An on-off apparatus and an electronic device. The on-off apparatus comprises an AC input terminal (100), an AC output terminal (110), an on-off module (120), a first DC blocking component (130) and a second DC blocking component (140), wherein the on-off module (120) comprises a first port (121), a second port (122), a third port (123), a fourth port (124), and a control terminal (125). The third port (123) is electrically connected with a DC power supply (VCC), the fourth port (124) is connected with a ground terminal, and the control terminal (125) is used for receiving a control signal. The on-off module (120) is used to turn on or off a path between the third port (123) and the fourth port (124) under the control of the control signal. In a case where the path between the third port (123) and the fourth port (124) is turned on, a path between the first port (121) and the second port (122) is turned on. In a case where the path between the third port (123) and the fourth path (124) is turned off, the path between the first port (121) and the second port (122) is turned off. The first DC blocking component (130) is connected between the AC input terminal (100) and the first port (121), and the second DC blocking component (140) is connected between the AC output terminal (110) and the second port (122).