Multi-Frequency Wireless Charging With Receiver Voltage Detection
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Solution Overview
Problem
Conventional wireless charging devices require separate charging devices for each frequency standard, increasing setup and maintenance costs and causing power loss due to continuous transmission without a receiver device present.
Innovation Solution
A wireless charging device that generates and transmits alternating current (AC) voltage signals at multiple frequencies, detecting compatible receiver devices using threshold voltage changes, and confirms presence through impedance adjustments, allowing a single device to charge devices with different frequency standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate charging devices are used for each frequency standard, then compatibility with different receiver devices is improved, but device complexity and cost increase
Solution Approach 1:
The charging device is designed with multiple transmitting units, each configured for a different frequency standard (e.g., first transmitting unit for 100-400 kHz Qi standard, second transmitting unit for 6-8 MHz AirFuel standard). The control unit intelligently selects and activates the appropriate transmitting unit based on the detected receiver device type, enabling a single charging device to serve multiple frequency standards without requiring separate dedicated devices for each standard.
Solution Approach 2:
The charging device dynamically switches between different transmitting units based on real-time detection of receiver device characteristics. The control unit monitors voltage changes at junctions of different transmitting units and activates the appropriate unit corresponding to the detected frequency standard, allowing the system to adapt its configuration dynamically rather than being fixed to a single frequency.
2Use of energy by moving object
If continuous power transmission is performed, then power availability is improved, but energy loss increases
Solution Approach 1:
The control unit continuously monitors voltage changes at the junctions of different transmitting units to detect the presence of receiver devices. When a receiver device is detected (indicated by voltage change exceeding a threshold), the control unit activates power transmission through the appropriate transmitting unit. When no receiver device is present (voltage change below threshold), transmission is halted. This feedback mechanism ensures power is transmitted only when needed, eliminating continuous transmission and associated energy waste.
Solution Approach 2:
Instead of continuous transmission, the system performs periodic detection of receiver device presence by monitoring voltage changes at transmitting unit junctions. Power transmission is activated in periodic cycles only when detection confirms a receiver device is present, converting continuous transmission into intermittent, demand-based transmission that reduces energy loss while maintaining power availability when needed.
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
Reduces power loss and enhances efficiency by ensuring power transmission only to detected devices, eliminating the need for multiple charging devices and supporting multiple frequency standards.
Implementation Method 1
a transmitting unit coupled to the driver unit, wherein the transmitting unit includes a first coil and a first capacitor coupled to each other and configured to transmit the first AC voltage signal having the first frequency
Data Source
AI summary
A wireless charging device includes a driver unit configured to generate one of a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency. Also, the wireless charging device includes a transmitting unit having a first coil and a first capacitor and configured to transmit the first AC voltage signal. Further, the transmitting unit includes a second coil and a second capacitor and configured to transmit the second AC voltage signal. Additionally, the wireless charging device includes a control unit configured to detect a first receiver device operating at the first frequency based on a change in a first voltage in the transmitting unit, and detect a second receiver device operating at the second frequency based on a change in a second voltage in the transmitting unit.