Wireless Power Transmission Coil Array Detection
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Solution Overview
Problem
Existing wireless power transmission systems with multi-coil arrays face inefficiencies in detecting the presence of multiple wireless power receiving apparatuses, leading to increased delay and power consumption due to sequential coil sensing and the need for separate communication means.
Innovation Solution
A wireless power transmission apparatus with a switching block, power amplification and transmission block, sensing block, and power distribution and control block, which uses periodical preamble signals to rapidly detect the presence of wireless power receiving apparatuses, minimizing power consumption by controlling power signal transmission only to active paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential coil sensing is used to detect the presence of power receiving apparatuses, then the system can identify active paths, but the delay time increases when several coils are sequentially sensed
Solution Approach 1:
The system segments the detection process by using a sensing block that can simultaneously monitor multiple coil paths through preamble signal analysis, rather than sequentially checking each coil. This segmentation allows parallel detection across multiple paths, reducing the overall detection time while maintaining accuracy.
Solution Approach 2:
The system performs preliminary action by transmitting preamble signals before actual power transmission. These preamble signals serve as preliminary detection probes that allow the system to identify active paths in advance, so that when power transmission is needed, the system already knows which coils to activate, eliminating sequential detection delays.
2Measurement precision
If all transmission coils are sequentially driven to determine the presence of power receiving apparatuses, then complete coverage is achieved, but a great deal of power is consumed
Solution Approach 1:
The system applies partial action by only activating and monitoring specific coil paths that show signs of activity through preamble signal detection. Instead of sequentially driving all transmission coils, the sensing block identifies which paths have receiving apparatuses present, and power is only transmitted through those identified paths, significantly reducing overall power consumption while maintaining detection completeness.
Solution Approach 2:
The system uses self-service by having the receiving apparatuses themselves indicate their presence through their response to preamble signals. The sensing block detects these responses without requiring active driving of all coils, allowing the system to identify active paths through the apparatuses' own signals rather than through exhaustive system-driven detection.
3Loss of information
If separate communication means are used to communicate with the battery, then feedback response can be received, but the device complexity increases
Solution Approach 1:
The system merges the communication function with the existing power transmission infrastructure by using the same coil array and signal processing block for both power transmission and feedback reception. The sensing block that detects preamble signals also receives feedback responses, eliminating the need for separate communication hardware and reducing overall device complexity while maintaining full feedback capability.
Solution Approach 2:
The coil array and sensing block are designed with multi-functionality, serving both as power transmission elements and as communication/reception elements. The same hardware components that transmit power and detect presence also receive feedback responses from batteries, allowing a single system to handle multiple functions without requiring separate dedicated hardware for each function.
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
Enables rapid recognition of multiple wireless power receiving apparatuses and efficient operation with reduced power consumption by selectively amplifying and transmitting power signals only to active paths, improving the efficiency of wireless power transmission.
Implementation Method 1
Wireless power transmission technology includes electromagnetic induction and magnetic resonance. In the electromagnetic induction method, a power transmission coil and a power reception coil are inductively coupled to each other with a distance of several millimeters (mm) therebetween to deliver energy by means of electromagnetic induction.
Implementation Method 2
In the electromagnetic induction method, a power transmission coil and a power reception coil are inductively coupled to each other with a distance of several millimeters (mm) therebetween to deliver energy by means of electromagnetic induction.
Implementation Method 3
In the magnetic resonance method, two dielectric resonators or coil resonators having the same resonance frequency are disposed close to each other to wirelessly transmit the power by means of resonance.
Data Source
AI summary
Provided are an apparatus and a method for transmitting wireless power. According to an embodiment of the present invention, a wireless power transmission apparatus includes: a switching block receiving distributed power signals and delivering the power signals as periodical preamble signals that make a detour around a power amplification and transmission block or delivering the power signals to the power amplification and transmission block; the power amplification and transmission block amplifying the power signals and transmitting the power signals to a coil array block; a sensing block detecting the preamble signals on the respective paths that are delivered to the coil array block, and sensing changes in the preamble signals according to whether wireless power receiving apparatuses appear; and a power distribution and control block controlling the switching block according to sensing results to transmit the power signals to the power amplification and transmission block.