Wireless Power Receiver Overcurrent Protection Logic
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Solution Overview
Problem
High-power wireless power systems face challenges in controlling high currents and voltages, leading to heating and potential damage due to overcurrent and overvoltage conditions, which existing technologies struggle to manage effectively.
Innovation Solution
A wireless power receiver system that operates in high-power mode by using a processor to compare output current signals with a current limit value, generating OC INT signals, transmitting End Power Transfer (EPT) packets, and enabling an LDO current limit circuit to protect against overcurrent conditions, while also employing hardware over-current detection in low-power mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-power wireless power transmission is implemented, then power delivery capability is improved, but overheating and device damage risk increases
Solution Approach 1:
The system performs preliminary thermal modeling and predicts future temperature conditions before actual overheating occurs. The processor calculates thermal characteristics based on power transmission parameters and predicts temperature trends, enabling preventive action before damage occurs.
Solution Approach 2:
The system continuously monitors power transmission parameters and uses this feedback to adjust power delivery in real-time. The processor receives power parameter data, compares it with thermal models, and dynamically controls the power transmission to maintain safe operating temperatures.
2Speed
If traditional overcurrent protection circuits are used, then response speed is improved, but system complexity and cost increase
Solution Approach 1:
The patent replaces traditional hardware overcurrent protection circuits with a software-based protection mechanism running on the device's existing processor. The processor executes protection logic that monitors power parameters and controls power delivery, eliminating the need for separate hardware protection circuits while maintaining fast response through software optimization.
3Device complexity
If software-based power control is implemented, then device integration is improved, but response speed may decrease
Solution Approach 1:
The system pre-calculates thermal characteristics and creates thermal models before power transmission begins. This preliminary action allows the software-based control to make rapid decisions during operation without requiring complex real-time calculations, maintaining fast response while using integrated software 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
The system effectively manages high-power transmission by reducing output current to prevent damage, ensuring safe operation and protecting both the receiver and load devices from overcurrent conditions, even in high-power scenarios.
Implementation Method 1
wireless power transfer involves 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 receiving power from a receiver coil and producing a rectified voltage
Data Source
AI summary
A method of over-current protection in a wireless power receiver operating in a high-power mode includes digitally receiving an output current signal, generating an OC INT signal if the output current signal is greater than a current limit value, and if the OC INT signal is generated, transmitting Count A number of End Power Transfer (EPT) packets. If wireless power transmission has not stopped, transmitting Count C number of Control Error Packets (CEPs) with Value B. If wireless power transmission has not reduced such that the output current IL is below the current limit value, then enabling an LDO current limit circuit in a power block of the wireless power receiver. In a low-power mode, the receiver enables a hardware over-current circuit that generates an OC INT signal when the output current exceeds a current limit.