Visible Light Communication Lighting Apparatus Signal Noise Reduction
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Solution Overview
Problem
Existing visible light communication systems face interference issues when multiple lighting apparatuses are present, leading to inaccurate signal reception due to radiation noise and difficulty in securing insulation properties, particularly when using modulation signals superposed on illumination light.
Innovation Solution
A lighting apparatus configured with a luminaire body, a visible-light-communication-signal-outputting part, and a photo-coupler, which modulates light intensity to superpose communication signals on illumination light, using a power supply circuit, switch element, and impedance element to control current flow and reduce radiation noise, while employing a photo-coupler for signal transmission to ensure insulation and simplify circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a receiving unit is added to each lighting apparatus to receive and verify communication signals, then communication accuracy is improved, but system cost and complexity increase
Solution Approach 1:
The receiving unit function is extracted from individual lighting apparatuses and consolidated into a separate communication signal receiving device. This allows each lighting apparatus to function as a simple transmitter without complex receiving and verification circuits, reducing overall system complexity while maintaining communication reliability through centralized signal verification.
2Stability of the object's composition
If a modulation signal is transmitted through electric wires connecting communication signal circuits to lighting apparatuses, then signal synchronization is achieved, but radiation noise increases and insulation becomes difficult
Solution Approach 1:
The electrical signal transmission through wires is replaced with optical signal transmission through light. The communication signal is modulated onto the illumination light emitted by the light source, eliminating the need for physical electric wire connections between the communication signal circuit and lighting apparatuses, thereby reducing radiation noise and insulation difficulties.
3Ease of manufacture
If general purpose electric wires are used to connect communication circuits to lighting apparatuses, then installation ease is improved, but insulation properties cannot be secured
Solution Approach 1:
The electrical connection system using general purpose electric wires is replaced with an optical connection system using light transmission. The modulation signal is transmitted by modulating the light intensity of the illumination light, eliminating the need for physical wire connections and associated insulation problems while maintaining installation simplicity.
4Power
If a relatively-large current flows through electric wires for modulation signal transmission, then power delivery is improved, but radiation noise increases and signal accuracy deteriorates
Solution Approach 1:
The electrical current transmission system is replaced with an optical light transmission system. The modulation signal is encoded by varying the intensity of the light source rather than by varying electrical current through wires. This eliminates radiation noise generated by large currents while preserving the modulation signal accuracy, as the light intensity can be precisely controlled to represent the communication signal.
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 effectively suppresses radiation noise, ensures accurate transmission of communication signals, and simplifies the circuit design, allowing for easy integration into existing non-insulated lighting systems, thereby enhancing signal synchronization and reducing interference.
Implementation Method 1
The photo-coupler is configured to receive the modulation signal output from the visible-light-communication-signal-outputting part
Implementation Method 2
a light source that includes a solid light-emitting element
Data Source
AI summary
A lighting apparatus for visible light communication includes at least one luminaire body and a visible-light-communication-signal-outputting part. The luminaire body includes a light source that includes an LED. The visible-light-communication-signal-outputting part is configured to output a modulation signal to the luminaire body. The luminaire body further includes: a power supply circuit configured to dim the light source; a switch element for modulating an output current that is supplied from the power supply circuit to the light source; a resistor connected in parallel with the switch element; and a photo-coupler configured to receive the modulation signal output from the visible-light-communication-signal-outputting part. The visible-light-communication-signal-outputting part is provided outside the luminaire body, and is configured to transmit the modulation signal via the photo-coupler.