High-Frequency AC Power Supply for Thin Display Cables
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Solution Overview
Problem
Large display devices require high power, necessitating thick cables and converters, which compromises design and user convenience, and using high DC voltage for thin cables leads to stability and manufacturing cost limitations.
Innovation Solution
An electronic device utilizing a power supply device that outputs high-frequency alternating current through a cable, with a balanced type filter and transformers to adjust voltage, and a display device that converts this current to a direct current, employing inverters, rectifiers, and transformers to manage voltage levels efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If high DC voltage is used to reduce cable thickness, then cable thickness is reduced, but stability and manufacturing cost are compromised
Solution Approach 1:
The patent changes the voltage parameter from DC to high-frequency AC, enabling thin cable transmission while maintaining stability through frequency-based power delivery. The power supply device converts DC input to high-frequency AC output, which can be transmitted through thin cables without the stability issues of high-voltage DC.
Solution Approach 2:
The patent replaces the mechanical/conversion system approach (using DC-DC converters in the display device) with an electromagnetic approach (using high-frequency AC transmission). The display device no longer needs complex voltage conversion circuitry, as the power is delivered in a form ready for direct rectification to the required voltage levels.
2Reliability
If thick cables are used to supply low DC voltage, then stability is improved, but device thickness and user convenience are compromised
Solution Approach 1:
The patent changes the electrical parameter from low-voltage DC to high-frequency AC, allowing thin cables to transmit the same power levels that previously required thick cables. The high frequency enables efficient power transmission with reduced current, thereby reducing the required cable cross-section while maintaining stability.
3Power
If DC-DC converters are mounted in the display device, then power conversion is achieved, but device complexity and thickness are increased
Solution Approach 1:
The patent extracts the power conversion function from the display device and relocates it to an external power supply device. The display device only needs to perform simple rectification of high-frequency AC to DC, while the complex DC-DC conversion is performed externally, significantly reducing the display device's complexity and thickness.
Solution Approach 2:
The patent introduces high-frequency AC as an intermediary power transmission form between the external power supply and the display device. This intermediary form allows efficient power transmission through thin cables while enabling simple rectification at the display device, avoiding the need for complex DC-DC converters.
4Length of moving object
If high-frequency AC is used for power transmission, then cable thickness is reduced, but additional filtering and transformation components are required
Solution Approach 1:
The patent designs the power supply device to perform multiple functions: rectification of input DC, generation of high-frequency AC, and voltage transformation. The external power supply device acts as a universal power adapter that can serve multiple display devices, and the integrated filter and transformer in the power supply device handle both filtering and voltage adjustment in a unified design.
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 reduces cable thickness, enhances user convenience, and minimizes manufacturing costs by optimizing power transmission through high-frequency alternating current.
Implementation Method 1
a balanced type filter configured to pass a high-frequency alternating current having a single frequency from the input alternating current
Implementation Method 2
a first transformer configured to increase a voltage of the high-frequency alternating current that has passed through the balanced type filter
Implementation Method 3
a second transformer configured to reduce the increased voltage of the high-frequency alternating current supplied from the cable to a predetermined level
Implementation Method 4
a rectifier configured to convert the high-frequency alternating current having the reduced voltage into the direct current of a target level of an operating voltage in an internal circuit
Data Source
AI summary
An electronic device includes a power supply device configured to output a high-frequency alternating current through a cable based on an input alternating current; and a display configured to operate based on a direct current obtained from the high-frequency alternating current supplied from the power supply device through the cable. The power supply device includes a balanced type filter configured to pass a high-frequency alternating current having a single frequency from the input alternating current; and a transformer configured to increase a voltage of the high-frequency alternating current and to output the high-frequency alternating current having the increased voltage through the cable. The display includes a transformer configured to reduce the increased voltage to a predetermined level; and a rectifier configured to convert the high-frequency alternating current having the reduced voltage into the direct current of a target level of an operating voltage.