Wireless Charging Control Signal Frequency and Phase Adjustment
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Solution Overview
Problem
Wireless charging methods experience electromagnetic interference (EMI) issues, leading to malfunctions in devices and potential adverse effects on human health, which existing technologies have not adequately addressed.
Innovation Solution
An electronic device with a conductive coil and power generation circuit, controlled by processors that adjust the frequency, phase, and duty cycle of a control signal to optimize power transmission, ensuring compliance with international standards and reducing EMI by comparing transmission power to a designated threshold and adjusting the control signal parameters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transmission is performed using electromagnetic induction or resonance, then power can be transmitted wirelessly to the power reception device, but electromagnetic interference (EMI) occurs causing device malfunctions and adverse health effects
Solution Approach 1:
The patent applies dynamics by making the operating frequency variable rather than fixed. The frequency of the wireless power transmission is dynamically adjusted based on detected EMI levels and environmental conditions. This allows the system to adapt to changing electromagnetic environments, avoiding fixed frequency interference while maintaining wireless power transmission functionality.
Solution Approach 2:
The patent changes the frequency parameter of the wireless power transmission system. By varying the operating frequency within a designated range and selecting optimal frequencies based on EMI detection, the system transforms the static frequency parameter into a dynamic one, thereby reducing electromagnetic interference while preserving the wireless charging capability.
2Object-affected harmful factors
If the frequency of the control signal is adjusted to reduce EMI, then electromagnetic interference is reduced, but the transmission power amount may vary requiring additional control mechanisms
Solution Approach 1:
The patent implements feedback control by continuously detecting the actual transmission power and comparing it with the target power level. Based on this feedback, the system adjusts the duty cycle of the control signal to compensate for power variations caused by frequency changes. This closed-loop control ensures that EMI reduction through frequency adjustment does not compromise the required transmission power.
Solution Approach 2:
The patent uses periodic modulation of the control signal (PWM with adjustable duty cycle) to regulate power transmission. By varying the duty cycle periodically, the system can precisely control the average power delivered while maintaining the adjusted frequency that reduces EMI, thus decoupling frequency control from direct power 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 solution effectively reduces EMI, ensuring safe and efficient wireless charging by dynamically adjusting the control signal parameters, thereby minimizing interference and adhering to international emission standards.
Implementation Method 1
One type of wireless charging may use electromagnetic induction
Implementation Method 2
another type may use magnetic resonance
Data Source
AI summary
An electronic device according to one embodiment of the present disclosure includes a conductive coil, a power generation circuit, and one or more processors operatively connected to the power generation circuit and may be configured to: compare an amount of transmission power to be supplied to a power reception device with designated threshold power amount, determine a designated frequency to be a frequency of a control signal for controlling the power generation circuit when the amount of transmission power is equal to or less than the designated threshold power amount, determine a phase of the control signal based at least in part on the amount of transmission power and/or the designated frequency when the designated frequency is determined to be the frequency of the control signal, transmit the control signal having the designated frequency and the phase to the power generation circuit to generate, based at least in part on the control signal, transmission power corresponding to the amount of transmission power, and supply the transmission power generated by the power generation circuit to the power reception device wirelessly via the conductive coil.