Wireless Power Slot Control for Stable Receiver Voltage
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in preventing overvoltage and undervoltage issues in wireless power receivers, especially during the power transfer phase when a slot is created.
Innovation Solution
The system employs a method where the wireless power transmitter operates at a first frequency before creating a slot and then switches to a higher second frequency after the slot ends, ensuring stable power delivery and preventing circuit damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wireless power transmitter creates a slot during power transfer, then communication or control functions can be performed, but overvoltage and undervoltage problems occur in the wireless power receiver
Solution Approach 1:
The system performs preliminary actions by switching to a higher second operating frequency before creating the slot and resumes at this frequency after the slot. This frequency switching preparation prevents voltage instability and circuit damage in the power receiver during the slot period, while still allowing communication functions to be performed.
2Ease of operation
If the wireless power transmitter stops power delivery during slot creation, then communication can occur, but charging stops after the slot
Solution Approach 1:
The system maintains continuity of useful action by delivering power continuously at the higher second operating frequency during the slot period rather than stopping power delivery. This ensures charging continues uninterrupted while still allowing communication functions to be performed during the slot.
3Adaptability or versatility
If the wireless power receiver circuit is exposed to voltage fluctuations during slot creation, then slot functionality is achieved, but circuit damage occurs
Solution Approach 1:
The system applies beforehand cushioning by switching to a higher second operating frequency before the slot is created and maintaining this frequency during and after the slot. This frequency adjustment cushions the power receiver circuit from voltage fluctuations and potential damage while still enabling slot functionality for communication and 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
This approach effectively prevents damage to the wireless power receiver's circuit and ensures continuous charging by managing voltage levels effectively during the slot creation process.
Implementation Method 1
The magnetic induction method corresponds to a method transmitting power by using electric currents that are induced to the coil of the receiver by a magnetic field, which is generated from a coil battery cell of the transmitter, in accordance with an electromagnetic coupling between a transmitting coil and a receiving coil.
Implementation Method 2
the magnetic resonance method is different from the magnetic induction method in that energy is transmitted due to a concentration of magnetic fields on both a transmitting end and a receiving end, which is caused by the generated resonance.
Data Source
AI summary
The present disclosure provides a method for transmitting wireless power, performed by a wireless power transmitter, in a wireless power transmission system, and a device using same, the method comprising: entering a power transmission phase associated with transmitting the wireless power to a wireless power receiver; generating a slot in the power transmission phase; and performing foreign object detection on the slot, wherein the wireless power transmitter transmits the wireless power to the wireless power receiver on the basis of a first operating frequency before generating the slot, the wireless power transmitter resumes transmitting the wireless power on the basis of a second operating frequency after the slot is ended, and the second operating frequency is a higher frequency than the first operating frequency.