Resonance Circuit Capacitance Variance for Stable Wireless Power
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Solution Overview
Problem
Wireless power transfer to display apparatuses, such as TVs, faces challenges in maintaining stable power transmission due to varying distances from peripheral devices, leading to instability in voltage gain and reduced power efficiency.
Innovation Solution
A display apparatus with a resonance circuit unit that adjusts its capacitance using a capacitance variance unit and switching elements to maintain a stable resonance point and voltage, regardless of distance from the power source, by varying the duty cycle and operating frequency of switching elements to ensure consistent power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transfer is applied to display apparatus, then wire complexity is removed and installation flexibility is improved, but power transmission stability deteriorates due to distance variations
Solution Approach 1:
The patent applies dynamics by making the capacitance value variable rather than fixed. The capacitance variance unit dynamically adjusts the capacitance of the resonance circuit based on the detected distance from the external apparatus, allowing the system to adapt to changing installation conditions and maintain stable power transmission across different distances.
Solution Approach 2:
The patent implements feedback through a distance detection unit that continuously monitors the distance between the display apparatus and the external apparatus. This detected distance information is fed back to the capacitance variance unit, which adjusts the capacitance accordingly, creating a closed-loop control system that maintains power transmission stability.
2Device complexity
If fixed capacitance is used in resonance circuit, then circuit simplicity is maintained, but resonance point stability deteriorates when distance changes
Solution Approach 1:
The patent transforms the static capacitance into a dynamic parameter by introducing a capacitance variance unit. This unit varies the capacitance value based on the detected distance, ensuring that the resonance circuit maintains its resonant condition even when the distance from the external apparatus changes, thus preserving resonance point stability.
Solution Approach 2:
The patent changes the capacitance parameter dynamically to compensate for distance variations. By adjusting the capacitance value according to the detected distance, the system maintains the resonant frequency and impedance matching conditions, ensuring stable power transfer despite changes in the physical configuration.
3Reliability
If capacitance is varied to maintain resonance, then power transmission stability is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent introduces dynamic elements (capacitance variance unit with switching elements) to maintain stable power transmission. The switching elements selectively connect different capacitance values based on the detected distance, enabling the resonance circuit to adapt to varying conditions while maintaining reliable power transfer.
Solution Approach 2:
The system performs self-adjustment by automatically varying the capacitance based on distance detection without requiring external intervention. The capacitance variance unit autonomously selects appropriate capacitance values to maintain resonance, reducing the need for manual configuration or external control systems.
4Productivity
If switching elements operate at high frequency, then power transfer efficiency is improved, but switching losses increase
Solution Approach 1:
The patent employs periodic switching action where the switching elements are turned on and off at optimized frequencies and duty cycles. By carefully controlling the switching timing and duration, the system achieves efficient power transfer while minimizing the time during which switching losses occur, balancing efficiency and energy loss.
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 solution enables stable and efficient power transmission to display apparatuses over a range of distances, ensuring consistent target power and image quality by dynamically adjusting the resonance circuit's capacitance and frequency to compensate for changes in mutual inductance and leakage inductance.
Implementation Method 1
a resonance circuit unit configured to generate a voltage by using an inductive electromotive force generated by an external apparatus
Implementation Method 2
a capacitance variance unit configured to vary a capacitance (Cv) of the resonance circuit unit to adjust a resonance point of the resonance circuit unit
Data Source
AI summary
The present invention relates to a display apparatus and operational method therefor, and an electronic apparatus, and the display apparatus according to an embodiment of the present invention may comprise: a resonance circuit unit for generating voltage by means of inductive electromotive force generated due to an external apparatus; a capacitance variance unit for varying the capacitance (Cv) of the resonance circuit unit in order to control the resonance point thereof, the resonance point having been changed due to the distance from the external apparatus; and a display panel for implementing an image by means of the voltage.