Circuit control method, coupling circuit and related products

By introducing an impedance tuning switch and a second tuning module into the NFC module, scanning failure and current overload problems caused by distance or alignment issues in NFC terminal devices are solved, improving the user experience.

CN118300640BActive Publication Date: 2025-09-19HONOR DEVICE CO LTD
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Patent Information

Application Number
CN202211736497.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-30
Publication Date
2025-09-19
Estimated Expiration
2042-12-30

AI Technical Summary

Technical Problem

In NFC terminal devices, existing technologies fail to scan due to weak electromagnetic coupling when the card is far away from the device or the position is not accurate. When the card is close to the device, current overload causes the device to restart, affecting the user experience.

Method used

By introducing an impedance tuning switch and a second tuning module into the NFC module, the impedance tuning switch is closed when the scanning current is less than a preset threshold, thereby increasing the input impedance of the coupling circuit, improving the scanning range and avoiding current overload, including the use of a single-pole single-throw switch and a capacitor for impedance tuning.

Benefits of technology

The scanning range is increased, avoiding scanning failures and current overloads caused by distance or alignment issues, improving the user experience and preventing device reboots.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application relates to the field of electronic technology and provides a circuit control method, a coupling circuit, and related products. The circuit control method is applied to an NFC module. The NFC module includes an NFC processor and a coupling circuit. The coupling circuit includes an induction coil and a first tuning module. The induction coil is configured to generate a coupling signal between the induction coil and a tag to be scanned under the action of the first tuning module, thereby enabling NFC communication between the NFC processor and the tag to be scanned. The NFC module also includes an impedance tuning switch and a second tuning module. The method includes: outputting a switch closing instruction when it is determined that no tag to be scanned is within a scanning range and the scanning current is less than a preset current threshold; wherein the switch closing instruction is configured to instruct the impedance tuning switch to close to increase the scanning current. The scanning current is the current in the coupling circuit when the NFC processor outputs a card search waveform. This method can avoid current overload while maintaining a large scanning range.
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Citation Information

Patent Citations

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    US20140256270A1

  • NFC reader with auto tuner

    US20180225482A1