Wireless Charging Transmitter Controller for Interference Prevention
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Solution Overview
Problem
Simultaneous operation of magnetic resonance type wireless charging and near field communication (NFC) type short range communication can lead to communication errors due to harmonic wave interference, and existing solutions either turn off NFC during charging or use switching circuits, which result in unnecessary power waste.
Innovation Solution
A transmitting apparatus with a controller that selectively switches between power transmission and communication transmission modes based on the presence of power or communication receivers, using magnetic resonance for power and NFC for communication, and enabling/disabling transmitters to prevent interference and reduce power waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power transmitter and communication transmitter are simultaneously operated, then both wireless charging and short range communication functions are available, but communication errors occur due to harmonic wave interference
Solution Approach 1:
The system dynamically switches between power transmission mode and communication mode based on detected receiver presence. The controller enables or disables the power transmitter and communication transmitter selectively, transforming the static simultaneous-operation system into a dynamic time-division system that avoids harmonic interference while maintaining dual functionality.
Solution Approach 2:
The system employs periodic sensing of receiver presence and switches modes accordingly. By repeatedly detecting whether a power receiver or communication receiver is present and alternating between modes in periodic cycles, the system ensures reliable operation while maintaining the ability to provide both wireless charging and short range communication services.
2Reliability
If the NFC chip is turned off during charging period, then communication errors are prevented, but unnecessary power is wasted when no power receiver is present
Solution Approach 1:
The controller continuously senses whether a power receiver or communication receiver is present and uses this feedback to selectively enable or disable the appropriate transmitter. This feedback mechanism ensures that the system only activates transmitters when needed, preventing unnecessary power consumption while maintaining communication reliability through selective operation.
Solution Approach 2:
The system automatically detects the type of receiver present and self-regulates its operation mode without external control. When a power receiver is detected, it activates power transmission; when a communication receiver is detected, it activates communication mode. This self-service capability eliminates the need for manual switching and optimizes power usage based on actual operational needs.
3Reliability
If switching circuit is used between power transmission circuit and communication circuit, then interference is prevented, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it senses receiver presence, determines the appropriate operation mode, and controls the selective enabling/disabling of transmitters. By making the controller multi-functional, the system avoids adding separate switching circuits while still achieving reliable interference-free operation through intelligent control.
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
Prevents communication errors and reduces power waste by selectively operating the power or communication transmitter based on sensed receivers, ensuring efficient operation of both wireless charging and short range communication.
Implementation Method 1
a resonance type wireless power transmission method that complies with the Alliance for Wireless Power (A4WP) standard uses a frequency of 6.78 MHz for transmitting power
Implementation Method 2
near field communication (NFC) is a technology for transmitting and receiving various wireless data over a short distance of within 10 cm using a frequency of 13.56 MHz
Data Source
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AI summary
Disclosed herein is a transmitting apparatus for both wireless charging and short range communication. According to an embodiment, the transmitting apparatus for both wireless charging and short range communication includes a power transmitter configured to wirelessly transmit power to a power receiver, a communication transmitter configured to wirelessly transmit information to a communication receiver, and a controller configured to control the transmitting apparatus to be selectively switched between a first mode in which the power transmitter is enabled and the communication transmitter is disabled and a second mode in which the communication transmitter is enabled and the power transmitter is disabled. The controller may switch to the first mode when the power receiver is sensed, and may switch to the second mode when the communication receiver is sensed. According to an embodiment of the present invention, a power receiver or a communication receiver is sensed and then a power transmitter or a communication transmitter corresponding thereto is selectively operated so that a communication error that occurs when the power transmitter and the communication transmitter are simultaneously operated is prevented and an unnecessary waste of power is reduced.