Wireless Charging Coil Control for Stable Close-Proximity Power Transfer
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Solution Overview
Problem
Wireless charging efficiency between electronic devices is unstable, particularly when conductive coils are close in proximity, leading to failed charging or low power transfer due to insufficient power delivery at the initial stages of charging.
Innovation Solution
An electronic device with a conductive coil and wireless charging circuitry that adjusts the frequency and duty cycle of the charging current based on received power control signals from an external device, increasing frequency and decreasing duty cycle at the start of charging to ensure stable power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive coil of the electronic device and the conductive coil of the external electronic device are very close in distance to each other, then wireless charging can be enabled, but charging may fail to be performed or charging efficiency may be unstable
Solution Approach 1:
The patent applies dynamics by making the charging current parameters adjustable rather than fixed. The processor dynamically changes the frequency and duty cycle of the charging current based on real-time charging conditions, allowing the system to adapt to varying coil proximities and maintain stable charging efficiency throughout the charging process
Solution Approach 2:
The patent implements parameter changes by modifying the frequency and duty cycle of the charging current. The processor increases or decreases these parameters based on feedback from the charging process, enabling the system to overcome instability caused by close coil proximity and maintain reliable wireless charging
2Power
If charging power is low in a process of starting charging, then wireless charging can be initiated, but charging efficiency may be more unstable
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the frequency and duty cycle of the charging current before and during the initial charging phase. The processor proactively modifies these parameters in response to low charging power conditions, preventing charging efficiency instability before it occurs rather than reacting after the problem manifests
Solution Approach 2:
The patent implements feedback by continuously monitoring charging power and efficiency, then using this information to adjust the charging current parameters. The processor receives feedback about charging conditions and dynamically modifies frequency and duty cycle to maintain stable charging efficiency even when charging power is low
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
Maintains stable power transfer and prevents voltage drops during charging, even when conductive coils are close, by dynamically adjusting the charging current parameters, thus ensuring efficient wireless charging.
Implementation Method 1
when a conductive coil of the electronic device and a conductive coil of the external electronic device are aligned, the electronic device may transfer power to the external electronic device through a specific frequency band
Data Source
AI summary
An electronic includes: a housing including a first plate, a second plate, and a side member; a display; a conductive coil parallel to the second plate and disposed between the display and the second plate; a wireless charging circuitry electrically connected to the conductive coil; and a processor operatively connected with the display and the wireless charging circuitry. The wireless charging circuitry receives a signal for wirelessly transferring power to an external electronic device from the processor, receives information about the external electronic device, receives a power control signal from the external electronic device via the conductive coil, applies a charging current of a first frequency to the conductive coil based at least in part on a request signal, increases a frequency of the charging current, compares the increased frequency with a first value, and adjusts a duty cycle of the charging current.