Resonant Inductive Coupling Extension Cord for LED Lighting
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Solution Overview
Problem
Existing resonant inductive coupling systems are limited to short-range wireless power transmission, typically less than 2 meters, and are not suitable for powering motors and lights over longer distances without generating sparks, which poses a hazard in flammable environments like coal mines.
Innovation Solution
A resonant inductive coupling extension cord system using a power supply with a power coil generating pulsed DC current at 0.8 KHz or greater, transmitted through a series or parallel configuration of receiver and transfer coils, allowing for safe and efficient power transmission up to 100 feet without sparks or shocks, and enabling operation of LEDs with increased lumens per watt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resonant inductive coupling is used for wireless power transmission, then sparks are prevented and safety is improved, but transmission distance is limited to less than 2 meters
Solution Approach 1:
The system divides the power transmission path into multiple segments using extension cords with receiver coils and transfer coils. Each segment transmits power over a short distance (less than 2 meters) through resonant inductive coupling, and multiple segments are connected in series or parallel to achieve total transmission distances of hundreds of feet while maintaining spark-free operation throughout each segment.
2Length of stationary object
If conventional electrical cords are used, then power can be transmitted over long distances, but sparks are generated at connections creating explosion hazards
Solution Approach 1:
The system replaces conventional mechanical electrical connections (plugs and sockets) with wireless resonant inductive coupling between coils. This substitution eliminates physical contact points where sparks could occur during connection/disconnection, while still enabling power transmission over long distances through multiple connected extension cord segments.
3Reliability
If resonant inductive coupling is used, then spark-free transmission is achieved, but sufficient power cannot be transmitted to operate motors and lights over long distances
Solution Approach 1:
The system combines multiple extension cords with receiver coils and transfer coils in series or parallel configurations. This merging of multiple power transmission paths allows the system to deliver sufficient total power to operate motors and lights over long distances while each individual coil pair maintains safe resonant coupling operation.
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
The system provides a safe, efficient, and reliable means to transmit power over long distances without sparks or shocks, enabling the use of LEDs in hazardous environments, with self-limiting current and reduced component requirements, and is tolerant to wide voltage ranges, maintaining effective lighting.
Implementation Method 1
Resonant inductive coupling is the near field wireless transmission of electrical energy between two magnetically coupled coils that are part of resonant circuits tuned to resonate at the same frequency
Implementation Method 2
Resonant transfer works by making a coil having an oscillating current. This generates an oscillating magnetic field. If a second coil is brought near it, the coil can pick up most of the energy before it is lost
Implementation Method 3
plurality of light emitting diodes connected to a receiver coil designed to receive the pulsed DC current from the power supply by means of resonant inductive coupling
Data Source
AI summary
A resonant inductive coupling extension cord and light emitting diode system having a plurality of light emitting diodes (LEDS) connected to a receiver coil designed to receive a pulsed DC current from a power supply by means of resonant inductive coupling. The power supply generates a pulsed DC current at a frequency of 0.8 KHz or greater, wherein the pulsed DC current is positive relative to ground. The power supply provides the pulsed DC current through a power coil and through the extension cords to the receiver coil. The (LEDs) are powered through resonant inductive coupling up to 160 volts. The light emitting diodes are self-limiting with respect to current. There is no potential for a spark or shock hazard when the extension cords are connected to the power supply, to the LED system or each other or whether the extension cords or LED are cut or broken.