Wireless Charging Frequency Modulation for Efficient Power Transfer
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Solution Overview
Problem
Existing wireless charging systems for portable devices, such as mobile phones and earphones, face inefficiencies in power transfer due to amplitude modulation, leading to increased charging time and power loss, especially when trying to charge devices with larger battery capacities.
Innovation Solution
The system employs frequency modulation during the charge mode to enable maximal power transfer, using an oversampling power amplifier and sinusoid generating switched-capacitor amplifier, allowing for more efficient power delivery without varying the output voltage of the rectifier, thus ensuring a stable supply voltage and reducing charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If amplitude modulation is used for data communication during wireless charging, then data can be transmitted between devices, but power transfer efficiency decreases and charging time increases
Solution Approach 1:
The patent segments the communication and power transfer functions by using separate frequency channels: amplitude modulation at 13.56 MHz for data communication and a different frequency for power transfer. This allows both functions to operate simultaneously without interfering with each other's efficiency.
Solution Approach 2:
The patent transitions from single-frequency operation to multi-frequency operation, adding the frequency dimension as a new degree of freedom. By operating at multiple frequencies simultaneously, the system can maintain both data communication and efficient power transfer without the trade-off present in single-frequency amplitude modulation systems.
2Loss of information
If amplitude modulation with 100% modulation depth is used, then data communication is achieved, but power transfer drops to zero during modulation phases
Solution Approach 1:
The patent separates data communication and power transfer into distinct frequency domains, allowing full-amplitude modulation for data without affecting power transfer continuity at the power frequency.
Solution Approach 2:
By using separate frequencies for communication and power transfer, the system maintains continuous power transfer action while simultaneously performing data communication, eliminating the intermittent power transfer that occurs during amplitude modulation cycles.
3Quantity of substance
If higher power is transmitted to charge larger batteries, then charging capacity increases, but power loss and temperature increase
Solution Approach 1:
The patent changes the operating frequency parameter to enable higher power transfer efficiency. By operating at optimized frequencies with appropriate modulation schemes, the system achieves better coupling and lower losses, enabling efficient charging of larger batteries without excessive power loss or temperature rise.
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
This approach enables faster charging and reduces power loss by maintaining power transfer efficiency even during data communication, making it suitable for devices with larger battery capacities and improving overall charging efficiency.
Implementation Method 1
the power transmitter stage is built to generate a magnetic field in the RFID frequency range and to modulate it with transmitter data and to transmit the modulated magnetic field with the power antenna
Implementation Method 2
which portable receiver stage is built to receive an antenna signal with the receiver antenna exposed to the modulated magnetic field and to demodulate the transmitter data and to rectify the antenna signal to charge the battery
Data Source
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Figure 5
AI summary
A system (17; 32) of a power device (18; 33) and a portable device (19; 34) for wireless charging of a battery (20) of the portable device (19; 34), which power device (18; 33) comprises a power transmitter stage and a power receiver stage connected with a power antenna (25) and which portable device (19; 34) comprises a portable transmitter stage and a portable receiver stage connected to a portable antenna (31), wherein the power transmitter stage is built to generate a magnetic field in the RFID frequency range and to modulate it with transmitter data and to transmit the modulated magnetic field with the power antenna (25) and which portable receiver stage is built to receive an antenna signal (30) with the receiver antenna (31) exposed to the modulated magnetic field and to demodulate the transmitter data and to rectify the antenna signal to charge the battery (20) in charging cycles and which portable transmitter stage is built to use an amplitude modulation to modulate the magnetic field with portable transmitter data and which power receiver stage is built to demodulate the portable transmitter data and which portable transmitter stage is built to transmit power adjustment data to increase or to decrease the power transmitted with the magnetic field emitted with the power antenna (25) of the power transmitter stage and needed to charge the battery (20) and which power receiver stage is built to receive the power adjustment data and to steer the power transmitter stage to transmit more or less power in the generated magnetic field, wherein, that the power device (18; 33) and the portable device (19; 34) are built to activate a charge mode and wherein the power transmitter stage and the portable transmitter stage in activated charge mode are built to add the functionality to use a frequency modulation to modulate the magnetic field to at least transmit the power adjustment data and wherein the power receiver stage and the portable receiver stage in activated charge mode are built to process a frequency demodulation of the antenna signals (30) to at least receive the power adjustment data.