Wireless Charging Protection Circuit for Magnetic Core Failure Detection
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Solution Overview
Problem
The existing wireless mobile phone charging solutions using high-permeability magnetic cores are prone to failure during mass production, leading to reduced charging efficiency and potential safety hazards, such as battery explosion, due to undetected failures in the ferrite material.
Innovation Solution
A charging protection circuit is introduced with a detection circuit between the high-permeability magnetic core and the power receiving device, comparing electromagnetic waves when the core is operational and when it has failed, using second and third receiving coils, converters, sensors, and comparators to determine core failure, and triggering an alarm or NFC shutdown signal to stop charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a high-permeability magnetic core is used in wireless charging, then charging efficiency is improved and battery protection is enhanced, but the risk of failure and safety hazards increases
Solution Approach 1:
The patent applies preliminary action by implementing a detection circuit that proactively monitors the magnetic core's permeability before failure occurs. The detection circuit continuously measures the magnetic flux through the magnetic core and compares it against threshold values, enabling early detection of degradation and preventing catastrophic failure while maintaining efficient charging operation.
Solution Approach 2:
The patent implements feedback by creating a closed-loop monitoring system where the detection circuit measures magnetic flux, processes the signal through comparison circuits, and triggers protective actions based on the results. This feedback mechanism allows the system to automatically respond to magnetic core degradation by shutting down charging when thresholds are exceeded, thus maintaining reliability without sacrificing charging efficiency during normal operation.
2Reliability
If a detection circuit is added to monitor magnetic core status, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the detection circuit functionality into the existing wireless charging circuit structure. The detection circuit shares common components such as the magnetic core, power supply, and control logic with the main charging circuit, thereby adding monitoring capability without proportionally increasing overall system complexity.
Solution Approach 2:
The patent implements universality by designing the detection circuit to serve multiple functions: it monitors magnetic core permeability, detects charging status, provides safety protection, and enables communication between transmitter and receiver. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving comprehensive safety 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
The solution effectively detects high-permeability magnetic core failures, preventing continuous charging and associated safety hazards by alerting the user and shutting down the charging process, thus ensuring the safety of the power receiving device.
Implementation Method 1
first receiving coils 20 configured to receive electromagnetic waves from the wireless charging base 1; a power supply circuit 26 configured to convert electromagnetic energy generated by the electromagnetic waves received by the first receiving coils into electric energy
Implementation Method 2
a high-permeability magnetic core 22 configured to block electromagnetic waves opposite to the electromagnetic waves from the wireless charging base
Implementation Method 3
a detection circuit 24 configured to compare the electromagnetic waves received from the wireless charging base when the high-permeability magnetic core is working normally and when the high-permeability magnetic core has failed
Implementation Method 4
The surface layer of the battery is a metal layer, the metal layer will generate eddy current effects in the alternating magnetic field, that is, an eddy current is generated on the metal surface layer to generate an opposite magnetic field
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Provided is a charging protection circuit. The charging protection circuit includes a wireless charging base and a charging receiving circuit. The charging receiving circuit includes first receiving coils configured to receive electromagnetic waves from the wireless charging base; a high-permeability magnetic core coupled to the first receiving coils and configured to block electromagnetic waves opposite to the electromagnetic waves from the wireless charging base; a detection circuit coupled to the high-permeability magnetic core and configured to detect whether the high-permeability magnetic core has failed; and a power supply circuit coupled to the high-permeability magnetic core and configured to convert electromagnetic energy generated by electromagnetic waves into electric energy to supply power to a power receiving device. With the technical solution, the serious result caused by continuous charging of a wireless charger after a high-permeability magnetic core has failed is avoided, thus guaranteeing the security of a power receiving device.