Wireless Power Access Control Using In-Band and Out-Band Communication
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Solution Overview
Problem
Current wireless power transmission systems lack an effective method for notifying wireless power receivers of the maximum number of supported devices and efficiently transitioning from in-band to out-band communication, leading to unclear rules and increased handover time in shared mode operations.
Innovation Solution
A wireless power transmitter and receiver system that utilizes a power conversion circuit with primary coils for magnetic coupling and a communication/control circuit to perform in-band and out-band communications, transmitting information on connectable devices and service support through advertising packets, allowing for efficient device notification and reduced handover time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If in-band communication is used for information exchange between wireless power transmitter and receivers, then power transmission can be established, but communication speed and information exchange capacity are limited
Solution Approach 1:
The patent combines in-band communication (using the same frequency as power transmission) and out-band communication (using separate frequencies like Bluetooth) into a hybrid communication system. The transmitter and receivers use both communication channels simultaneously to exchange information, thereby increasing communication speed and capacity without significantly increasing system complexity.
2Adaptability or versatility
If the wireless power transmitter supports multiple wireless power receivers, then service coverage is improved, but the handover time and communication complexity increase
Solution Approach 1:
The patent implements preliminary actions by having the wireless power transmitter pre-negotiate and pre-configure communication parameters with multiple receivers before power transmission begins. The transmitter uses out-band communication to exchange information about the maximum number of supported devices and service availability in advance, so that when receivers need to connect or handover, the process is faster and more efficient.
Solution Approach 2:
The patent introduces out-band communication as an intermediary channel that facilitates faster information exchange between the transmitter and multiple receivers. This separate communication path allows for efficient negotiation of device limits and service parameters without interfering with the power transmission band, thereby reducing handover time while supporting multiple devices.
3Ease of operation
If clear information about supported devices and service availability is transmitted, then receiver connection efficiency is improved, but communication overhead increases
Solution Approach 1:
The patent extracts critical information about device support limits and service availability into separate out-band communication messages, distinct from the main power transmission control data. By taking out this specific information into a dedicated notification mechanism, receivers can quickly ascertain compatibility and connection parameters without processing excessive communication overhead in the in-band channel.
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
Enables efficient connection with multiple wireless power receivers, reduces the time from initial connection to wireless power transmission, and clarifies the shared mode operation rules by providing clear information on supported devices and service availability.
Implementation Method 1
a power conversion circuit, which has a plurality of primary coils, configured to transfer a wireless power to a wireless power receiver using a primary coil that forms a magnetic coupling with the wireless power receiver
Implementation Method 2
perform an in-band communication with the wireless power receiver using the operating frequency
Data Source
AI summary
The present invention relates to an access control method and device in a wireless power transmission system. A wireless power transmission device comprises: a power conversion circuit configured to have a plurality of primary coils and transmit wireless power to a wireless power reception device by using the primary coil which has formed magnetic coupling to the wireless power reception device at an operating frequency; and a communication/control circuit configured to perform in-band communication with the wireless power reception device by using the operating frequency and perform out-band communication with the wireless power reception device by using a frequency other than the operating frequency, wherein the communication/control circuit can transmit information for notifying whether or not connection to the wireless power reception device is possible by using the out-band communication.