Dual Protocol Wireless Power Transmitter
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Solution Overview
Problem
Existing wireless charging systems face challenges in supporting multiple wireless power receiving devices that use different charging protocols, leading to inefficiencies and compatibility issues when multiple devices are charged simultaneously.
Innovation Solution
A wireless power transmitting device equipped with control circuitry that detects and communicates with multiple wireless power receiving devices using in-band frequency-shift-keying and amplitude-shift-keying packets, allowing it to negotiate power levels and adapt to different charging protocols by stopping and restarting power transmission as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless power transmitting device uses a single charging protocol, then the device complexity is reduced, but the adaptability to different wireless power receiving devices is limited
Solution Approach 1:
The wireless power transmitting device is designed to support multiple wireless charging protocols (first protocol with FSK-ASK communication and second protocol with ASK-only communication) within a single system. The control circuitry can detect which protocol a receiving device supports and automatically switch between protocols, making the transmitting device universal and compatible with various device types without requiring separate charging devices for each protocol.
Solution Approach 2:
The system dynamically switches between different communication protocols based on the detected capabilities of the receiving device. The control circuitry transitions from using FSK-ASK communication (first protocol) to ASK-only communication (second protocol) when appropriate, allowing the system to adapt its behavior in real-time based on the connected device rather than being fixed to a single protocol.
2Reliability
If the wireless power transmitting device attempts to communicate with all devices using the first protocol, then communication compatibility is improved, but power transmission efficiency deteriorates due to failed responses from second protocol devices
Solution Approach 1:
The control circuitry monitors the response status of wireless power receiving devices to determine which protocol they support. When a device fails to respond with an amplitude-shift-keying packet after receiving a frequency-shift-keying packet, the system uses this feedback to conclude the device supports the second protocol and switches communication methods accordingly, ensuring reliable communication without wasting power on incompatible devices.
Solution Approach 2:
The system dynamically adjusts its communication approach based on real-time device responses. Instead of persisting with a single communication method, the transmitting device transitions between protocols based on detected device capabilities, maintaining communication reliability while avoiding the inefficiency of repeatedly attempting failed communications.
3Adaptability or versatility
If the wireless power transmitting device stops and restarts power transmission to detect second protocol devices, then protocol detection capability is improved, but the charging time increases
Solution Approach 1:
The control circuitry performs preliminary protocol detection by sending a frequency-shift-keying packet before initiating full power transmission. This preliminary action allows the system to identify the receiving device's protocol support early in the process, determining whether the device responds with an amplitude-shift-keying packet (first protocol) or remains silent (second protocol), thereby avoiding unnecessary protocol-switching delays during actual charging.
Solution Approach 2:
The system uses periodic power transmission cycles with detection phases. Between actual power transmission periods, the control circuitry performs brief detection cycles by sending protocol-specific packets and monitoring responses. This periodic detection approach minimizes the impact on charging time while ensuring proper protocol identification and switching.
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 simultaneous charging of multiple devices with different wireless charging protocols, ensuring efficient power transmission and compatibility, thereby enhancing user convenience and device charging capabilities.
Implementation Method 1
a wireless charging mat wirelessly transmits power to a portable electronic device that is placed on the mat. The portable electronic device has a receiving coil and rectifier circuitry for receiving wireless alternating-current (AC) power from a coil in the wireless charging mat that is overlapped by the receiving coil.
Implementation Method 2
The rectifier converts the received AC power into direct-current (DC) power.
Data Source
AI summary
Multiple wireless power receiving devices operating in accordance with potentially different wireless charging protocols may be placed on a wireless power transmitting device. The wireless power transmitting device sends a frequency-shift-keying packet. If a wireless power receiving device is compliant with a first wireless charging protocol, the device responds to the frequency-shift-keying packet with an amplitude-shift-keying response packet. If the wireless power receiving device is compliant with a second wireless charging protocol, the wireless power receiving device will fail to respond to the frequency-shift-keying packet and the wireless power transmitting device responds by stopping and starting wireless power transmission and awaiting an amplitude-shift-keying packet from the wireless power receiving device in accordance with the second wireless charging protocol.