Wireless Charger Electromagnet Control for Coil Alignment
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Solution Overview
Problem
Wireless charging of devices often requires precise alignment of transmitter and receiver coils, which can be challenging due to low magnetic attraction between non-magnetic metal plates, leading to a degraded user experience with unreliable charging and potential damage from strong magnetic fields.
Innovation Solution
Incorporating an electromagnet with a control circuit that activates or deactivates the magnetic field for alignment assistance, reducing the risk of damage and improving precision by controlling magnetic field strength based on the presence of a wireless power supply device and the quality of power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an electromagnet is used to provide strong magnetic attraction for coil alignment, then alignment precision is improved, but magnetic interference with external devices increases
Solution Approach 1:
The electromagnet's magnetic field is made dynamic through on-demand activation. The control circuit activates the electromagnet only when a wireless power supply device is detected in proximity, and deactivates it when not needed. This dynamic control maintains strong magnetic attraction for alignment when required, while minimizing magnetic interference with external devices when the charging function is not in use.
Solution Approach 2:
The magnetic field strength parameter is changed from a constant strong field to a variable field that is activated only when needed. By controlling the electromagnet's power state (on/off) based on the presence of a wireless power supply device, the system adjusts the magnetic field parameter to resolve the contradiction between needing strong attraction for alignment and minimizing interference with external devices.
2Measurement precision
If the electromagnet is continuously activated to maintain alignment, then alignment precision is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous activation, the electromagnet is activated periodically or on-demand based on the presence of a wireless power supply device. The control circuit detects when a power supply device is nearby and activates the electromagnet only during that period, rather than keeping it continuously on. This periodic activation maintains alignment precision when needed while significantly reducing energy consumption during idle periods.
Solution Approach 2:
The system transitions from static continuous operation to dynamic on-demand operation. The electromagnet's activation state changes dynamically based on environmental conditions (presence of power supply device), allowing the system to maintain alignment precision only when necessary, thereby reducing overall energy consumption.
3Measurement precision
If strong magnetic fields are used for alignment assistance, then alignment precision is improved, but potential damage to external devices increases
Solution Approach 1:
The control circuit implements preliminary detection of a wireless power supply device's presence before activating the electromagnet. By detecting the proximity of a power supply device first, the system can activate the electromagnet only when appropriate, preventing strong magnetic fields from acting on unrelated external devices that could suffer damage. This preliminary detection and conditional activation serves as a protective measure.
Solution Approach 2:
The magnetic field parameter is changed from a constantly strong field to a conditionally activated field. By monitoring the presence of a wireless power supply device and adjusting the electromagnet's activation state accordingly, the system ensures strong magnetic fields are applied only when needed for alignment, preventing potential damage to external devices that are not part of the charging system.
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
Enhances user experience by ensuring accurate alignment and efficient charging while minimizing magnetic interference with external devices, maintaining alignment only when necessary to conserve energy and reduce emissions.
Implementation Method 1
a control circuit configured to control a magnetic field strength generated by the electromagnet for alignment of a power-receiving coil
Implementation Method 2
Wireless charging of devices often requires precise alignment of transmitter and receiver coils
Data Source
AI summary
The present disclosure relates to a wireless-chargeable device and an apparatus for controlling a magnetic field strength of a magnetic field generated by an electromagnet. The wireless-chargeable device includes an electromagnet (102) and a control circuit (104). The control circuit (104) is configured to control a magnetic field strength generated by an electro-magnet for alignment of a power-receiving coil (106) of the wireless-chargeable device with respect to a power-transmitting coil of a wireless power supply device.