Wireless Power Charging Control for CEP Timeout Distortion
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Solution Overview
Problem
In wireless power transmission systems, light load states can cause distortion in control error packets, leading to premature termination of power transmission despite the device being in the charging area, resulting in unnecessary interruptions and delayed charging.
Innovation Solution
A wireless power transmission device with a primary coil and a communication unit that receives and decodes control error packets, utilizing a CEP timer and interrupt count to determine if the device is still in the charging area, allowing continuous charging even if packets are not transmitted within a predetermined period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the charger uses a predetermined period timeout method to detect terminal removal, then the detection simplicity is improved, but the charging reliability deteriorates due to packet distortion in light load states
Solution Approach 1:
The patent implements a feedback mechanism where the charger monitors control error packets sent by the terminal and uses interrupt counts to verify successful reception. When packet distortion occurs due to light load states, the system detects the communication failure through missing interrupts and responds by adjusting power transmission, thereby maintaining charging reliability without increasing system complexity
Solution Approach 2:
The patent replaces the mechanical timeout-based detection method with an interrupt-driven communication verification system. Instead of simply timing out when no packets are received, the system uses interrupt counts to track successful packet receptions and distinguishes between genuine terminal removal and packet distortion caused by light load states, thereby improving charging reliability
2Speed
If the charger terminates power transmission upon timeout, then the response speed to terminal removal is improved, but the charging continuity deteriorates due to false detection in light load states
Solution Approach 1:
The patent performs preliminary verification by counting interrupts before terminating power transmission. When a timeout occurs, the system first checks whether interrupt counts indicate successful packet reception, and only terminates transmission if both timeout and low interrupt count are detected. This preliminary action prevents false termination due to light load state distortion while maintaining fast response to genuine terminal removal
Solution Approach 2:
The patent dynamically adjusts the termination decision based on real-time interrupt count data. Instead of a fixed timeout termination policy, the system adapts its response by considering the interrupt count status, allowing it to maintain charging continuity when distortion occurs but quickly terminate when the terminal is genuinely removed, thus balancing response speed and charging continuity
3Measurement precision
If the charger monitors control error packets continuously, then the detection accuracy of terminal removal is improved, but the energy consumption increases
Solution Approach 1:
The patent uses the terminal's own control error packets as the detection mechanism. The terminal periodically sends these packets during normal operation, and the charger simply monitors their receipt through interrupt counting. This self-service approach allows accurate detection of terminal removal without requiring additional active transmission or monitoring resources from the charger, thus maintaining detection accuracy while minimizing energy consumption
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 unnecessary interruptions in wireless power transmission, ensuring continuous charging by accurately determining if the device is in the charging area, even during light load states, thereby enhancing charging efficiency.
Implementation Method 1
the wireless power transmission system requires a coupling (magnetic induction and/or magnetic resonance) between the primary coil provided in a charger and the secondary coil provided in a terminal
Implementation Method 2
the wireless power transmission system requires a coupling (magnetic induction and/or magnetic resonance) between the primary coil provided in a charger and the secondary coil provided in a terminal
Data Source
AI summary
The present invention relates to a power control method and device in a wireless power transmission system. According to the present invention, even if a CEP packet is not transmitted from a wireless power reception device over a certain period of time, a wireless power transmission device may additionally determine whether the wireless power reception device is located in a charging area and sustainably perform charging.