Wireless Power Transmit Detection for Tx-to-Tx Conflict Protection
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Solution Overview
Problem
Wireless power systems face conflicts when multiple devices capable of transmitting and receiving power are brought into proximity, leading to high currents and voltages that can cause damage.
Innovation Solution
A wireless power device with a rectifier circuit, transmit driver, transmit detect circuit, and controller that detects the presence of incoming wireless power and prevents transmission to avoid conflicts, activating the transmit driver only in the absence of detected power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a device is designed to both transmit and receive wireless power, then the device's versatility is improved, but the risk of transmit conflicts increases when multiple such devices are brought into proximity
Solution Approach 1:
The transmit detect circuit performs preliminary detection of transmitted wireless power presence before the transmit driver activates. This advance detection prevents transmit conflicts by ensuring the device only transmits when no other device is already transmitting, resolving the contradiction between dual functionality and conflict avoidance
2Reliability
If the transmit detect circuit continuously monitors for transmitted power, then the reliability against transmit conflicts is improved, but the energy consumption increases
Solution Approach 1:
The transmit detect circuit operates periodically rather than continuously, monitoring for transmitted power at intervals before transmit operations. This periodic operation maintains reliable conflict detection while significantly reducing energy consumption compared to continuous monitoring
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 transmit conflicts by ensuring that a device does not transmit power when another device is already transmitting, thereby preventing high currents and voltages that could damage the devices.
Implementation Method 1
a transmitter driving a transmit coil and a receiver with a receiver coil placed proximate to the transmit coil. The receiver coil receives the wireless power generated by the transmit coil
Implementation Method 2
a rectifier circuit coupled to a coil; a transmit driver coupled to the rectifier circuit
Data Source
AI summary
A wireless power device is presented that avoids transmit conflicts. The device can include a rectifier circuit coupled to a coil; a transmit driver coupled to the rectifier circuit; a transmit detect circuit configured to detect receipt of transmitted wireless power at the coil; and a controller coupled to the transmit driver and the transmit detect circuit, the controller receiving a signal from the transmit detect circuit and providing an alert of the presence of the transmitted wireless power, the controller activating the transmit driver to transmit wireless power in absence of the signal. The wireless device can determine an operating mode and in a transmit mode determine presence of a received power. If received power is detected an alert can be provided and an off state initiated. If transmit power is not detected the transmit driver can be activated.