Wireless Power Receiver Control Using BLE and RSSI Thresholds
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Solution Overview
Problem
Current wireless power transmission systems face limitations in high-speed information exchange and compatibility between different power levels, particularly in maintaining stable power transfer and preventing overvoltage issues due to the lack of efficient out-band communication protocols for detecting and managing wireless power receivers.
Innovation Solution
The implementation of a wireless power transmission system that utilizes out-band communication, specifically Bluetooth Low Energy (BLE), to enable high-speed detection of wireless power receiver replacement, distance estimation, and adaptive communication mode adjustment, allowing for efficient power transfer and link management by using Received Signal Strength Indicator (RSSI) and voltage thresholds to control power transmission and communication links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in-band communication is used for wireless power transmission, then power transfer can be established, but high-speed information exchange and high-capacity communication are limited
Solution Approach 1:
The communication function is segmented into two separate channels: in-band communication for power transfer control and out-band communication for high-speed data exchange. This allows each communication channel to be optimized for its specific purpose without compromising the other.
Solution Approach 2:
An out-band communication system acts as an intermediary for high-speed information exchange, while the in-band communication maintains the power transfer function. The two communication bands work independently but coordinate through the wireless power transmission system.
2Device complexity
If wireless power transmission is performed without out-band communication, then system simplicity is maintained, but detection of receiver replacement and distance estimation are insufficient
Solution Approach 1:
The out-band communication system serves as an intermediary for detecting receiver replacement and estimating distance through RSSI measurements, providing accurate measurement capabilities without significantly increasing system complexity.
Solution Approach 2:
The out-band communication channel performs multiple functions including receiver detection, distance estimation, and communication mode adjustment, making the additional system complexity worthwhile by enabling precise measurements and adaptive control.
3Productivity
If out-band communication is implemented for high-speed detection, then receiver replacement and distance estimation improve, but system complexity increases
Solution Approach 1:
The out-band communication system provides multiple functions (high-speed detection, distance estimation, mode adjustment) through a single additional communication channel, achieving high productivity without proportionally increasing system complexity.
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 supports various applications by enabling rapid and secure power transfer management, preventing malfunctions and ensuring compatibility between different power levels, while maintaining efficient communication and power delivery.
Implementation Method 1
a power pick-up circuit configured to receive wireless power from a wireless power transmitter through magnetic coupling with the wireless power transmitter in an operating frequency
Implementation Method 2
Magnetic induction is a method of transmitting energy using current induced to a coil of a reception side due to magnetic fields generated in a coil battery cell of a transmission side according to electromagnetic coupling of a coil of the transmission side and the coil of the reception side
Implementation Method 3
Out-band communication includes, for example, NFC and Bluetooth Low Energy (BLE) communication
Data Source
AI summary
According to one aspect of the present disclosure, a wireless power receiver for receiving wireless power on the basis of out-band communication is provided. The receiver comprises: a power pick-up circuit configured to receive wireless power from a wireless power transmitter at an operating frequency; and a communication/control circuit configured to perform at least one of in-band communication using the operating frequency and out-band communication using a frequency other than the operating frequency. Here, on the basis of at least one of the received voltage in the power pick-up circuit and a received signal strength indicator (RSSI) of a first signal related to the out-band communication, the communication/control circuit may perform a power interruption procedure for interrupting transmission of the wireless power and a disconnection procedure for releasing the connection of the out-band communication.