Speaker as Wireless Power Repeater for Display Systems
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Solution Overview
Problem
In display systems, the efficiency of wireless power transmission and reception decreases with increasing distance from the transmitter, making it difficult to place components beyond a certain distance, and using a separate repeater increases production costs and volume, while sound bars as repeaters struggle to generate sufficient power signals due to load and resonance point changes.
Innovation Solution
A display system that uses a speaker as a repeater to amplify and retransmit power signals, incorporating wireless power transmission and reception circuits, distribution circuits, and impedance conversion to maintain efficient power transfer over longer distances without thickening the display or increasing volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the distance from wireless power transmitter to component is increased, then the placement flexibility is improved, but the power transmission efficiency is significantly reduced
Solution Approach 1:
The patent introduces a speaker as an intermediary device between the wireless power transmitter and the display component. The speaker receives power wirelessly from the transmitter, converts it to electrical current, and then transmits power to the display through magnetic field coupling. This intermediary approach enables power transmission over distances beyond the direct coupling range while maintaining adequate efficiency.
Solution Approach 2:
The power transmission path is divided into two segments: first from the wireless power transmitter to the speaker, and second from the speaker to the display. This segmentation allows each component to operate within its optimal coupling distance while achieving overall extended transmission distance.
2Loss of energy
If a coil is wound around a thick magnetic material to improve power reception efficiency, then the power reception efficiency is improved, but the thickness of the display is thickened
Solution Approach 1:
The speaker acts as a power mediation device that performs electromagnetic conversion, eliminating the need for thick magnetic shielding materials in the display. The speaker's power transmission circuit generates magnetic fields that couple with the display's reception coil, providing efficient power transfer without requiring the display itself to have thick magnetic materials.
3Length of stationary object
If a separate repeater is added to increase transmission distance, then the transmission distance is extended, but the production cost and system volume are increased
Solution Approach 1:
The speaker is designed to perform multiple functions: it serves as both an audio output device and a wireless power transmission/repetition device. The speaker's internal power transmission circuit enables it to function as a repeater, extending the wireless power transmission distance without requiring a separate dedicated repeater device. This multi-functionality avoids increasing system volume and reduces production costs.
4Length of stationary object
If a sound bar is used as a repeater, then the transmission distance is extended, but the power signal magnitude is insufficient due to load and resonance point changes
Solution Approach 1:
The patent employs impedance conversion circuits that dynamically adjust electrical parameters to maintain optimal resonance conditions. The impedance conversion circuit changes the resonance point according to the load, ensuring that the power transmission circuit operates at maximum efficiency regardless of the speaker's audio output load. This parameter adjustment maintains sufficient power signal magnitude for extending transmission distance.
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 configuration allows for efficient wireless power transmission and reception over specified distances, improving the display system's appearance and reducing production costs by using the speaker as a repeater to supply power for both sound and image output units.
Implementation Method 1
a wireless power transmitter that converts power supplied from a power source unit into a first magnetic field and to transmit a first power signal to a speaker
Implementation Method 2
a wireless power reception circuit that converts the second power signal received from the speaker into a third current
Data Source
AI summary
A display system may include a wireless power transmitter that converts power supplied from a power source unit into a first magnetic field and to transmit a first power signal to a speaker; the speaker including a wireless power transmission/reception circuit that converts the first power signal received from the wireless power transmitter into a first current, and to generate a second magnetic field by the first current to transmit a second power signal to a display, a distribution circuit that distributes power received through the first power signal to a sound output unit by distributing the first current and outputting a second current, and the sound output unit that outputs sound using power supplied from the distribution circuit; and the display including a wireless power reception circuit that converts the second power signal received from the speaker into a third current, and an image output unit that outputs an image by using power transferred through the third current.