Two-Wire Lamp Control Using Power-Line Signal Superposition
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Solution Overview
Problem
Existing four-wire lamp systems transformed into two-wire systems face signal transmission errors due to lack of power during low duty cycles, leading to lamp failure.
Innovation Solution
A method and system that involves inputting R, G, and B lamp control signals to oscillators generating higher frequency oscillation signals, amplifying and coupling these signals with integrated power, superposing onto composite electric power, and using a two-wire system to transmit the composite signal, and signal-power separation to restore the original signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If lamp control signals in a complete period are sampled and converted into coded signals for two-wire transmission, then transformation from four-wire system to two-wire system is realized, but signal transmission errors occur due to lack of power during low duty cycle periods
Solution Approach 1:
The patent combines control signals and power transmission into a single two-wire system by modulating control signals onto power lines using high-frequency oscillation. This merging eliminates the need for separate control wires while maintaining reliable signal transmission through continuous power carrier wave, resolving the contradiction between reduced wiring complexity and signal transmission reliability during low duty cycles.
Solution Approach 2:
The patent uses periodic high-frequency oscillation signals as a carrier wave to transmit control information. By modulating control signals onto this continuous periodic power carrier, the system ensures continuous power transmission and reliable signal delivery even when control duty cycles are low, preventing signal loss while maintaining simplified two-wire architecture.
2Reliability
If sampling accuracy and stability requirements are increased to improve signal conversion, then signal transmission errors are reduced, but system complexity and cost increase
Solution Approach 1:
The patent replaces complex sampling and analog-to-digital conversion systems with a simpler modulation-based approach. Instead of sampling control signals and converting them to coded signals, the system directly modulates control signals onto high-frequency power carrier waves, eliminating the need for high-precision sampling circuits and reducing overall system complexity while maintaining transmission reliability.
Solution Approach 2:
The patent changes the transmission parameter from baseband control signals to high-frequency modulated signals. By transforming the control signals into high-frequency oscillations that ride on the power carrier, the system achieves reliable transmission without requiring high sampling accuracy, thereby reducing system complexity while maintaining signal integrity.
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
Ensures synchronous transmission of composite signals with reduced delay and continuous power supply, preventing lamp failure and simplifying system structure while reducing wiring complexity and costs.
Implementation Method 1
inputting R (red), G (green) and B (blue) lamp control signals in a four-wire system to three corresponding oscillators respectively, and controlling the oscillators to generate R, G and B oscillation signals respectively, wherein oscillation frequencies of the three oscillators are different and are all higher than frequencies of the input R, G or B lamp control signals
Implementation Method 2
the R, G and B oscillation signals are coupled by capacitive coupling or transformer coupling
Implementation Method 3
the R, G and B oscillation signals are coupled by capacitive coupling or transformer coupling
Implementation Method 4
superposing the composite signal onto the integrated electric power to obtain composite electric power that is transmitted by a two-wire system
Implementation Method 5
enabling the composite signal to sequentially pass through three LC frequency selection circuits for frequency selection to restore the composite signal into the amplified R, G and B oscillation signals
Implementation Method 6
demodulating the amplified R, G and B oscillation signals to obtain the R, G and B lamp control signals respectively
Data Source
AI summary
A four wire-to-two wire lamp control method includes: inputting R, G and B lamp control signals are to corresponding oscillators which are controlled to generate R, G and B oscillation signals; the three oscillation signals being amplified and then coupled into a composite signal which is superposed onto integrated electric power to obtain composite electric power that is transmitted by a two-wire system transmission module. In this way, transformation from a four-wire lamp system to a two-wire lamp system is realized. The composite signal and power are synchronously transmitted in the two-wire system, such that the system can approximately synchronously transmit the composite signal at a low delay, and the integrated electric power can still be transmitted continuously in case of a low duty cycle of the lamp control signals, thus satisfying the requirement for driving power of a lamp.