DC Lighting System Arc Suppression via Voltage Verification
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Solution Overview
Problem
Conventional illuminating systems face challenges in suppressing electric arcs when there is an incomplete connection between the input terminal and conductor of a DC power supply path, as the DC voltage lacks zero-crossing points, making it difficult to extinguish arcs.
Innovation Solution
A lighting system comprising a signal transmitting device, a signal receiving device, and a lighting device that adjusts the voltage value of a DC voltage based on transmission data, keeping the light source extinguished until an activation command is received, thereby controlling the state change and preventing electric arcs during incomplete connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the illuminating fixture is directly connected to DC power supply paths, then the fixture can operate without an AC/DC converter, but electric arcs may form and become difficult to extinguish under incomplete connection conditions
Solution Approach 1:
The control circuit performs preliminary voltage verification before enabling the light source. It first applies a first voltage level to verify proper connection, and only after successful verification applies a second voltage level to activate the light source. This preliminary action prevents electric arcs by ensuring complete connection before full power activation.
Solution Approach 2:
The system dynamically adjusts the voltage level applied to the light source based on connection status. The control circuit switches between a first voltage level (verification mode) and a second voltage level (operation mode), creating a dynamic voltage control system that adapts to connection conditions and prevents harmful electric arcs.
2Duration of action of stationary object
If DC voltage is applied continuously to the light source, then the light source remains illuminated, but electric arcs cannot be extinguished due to lack of zero-crossing points
Solution Approach 1:
The control circuit implements periodic voltage verification by repeatedly applying the first voltage level to check connection status before and during operation. This periodic action allows the system to detect and respond to connection issues, enabling arc suppression while maintaining continuous illumination through controlled voltage application.
Solution Approach 2:
The system changes the voltage parameter from a single continuous level to multiple discrete levels (first voltage level for verification, second voltage level for operation). This parameter change enables the control circuit to differentiate between verification and operation phases, allowing arc suppression through controlled voltage transitions while maintaining reliable illumination.
3Speed
If the voltage conversion circuit operates without verification, then the lighting system responds quickly to activation commands, but connection issues may cause electric arcs and noise interference
Solution Approach 1:
The control circuit performs preliminary connection verification by applying the first voltage level and checking the response before transitioning to the second voltage level for normal operation. This preliminary action filters out improper connections that would cause noise interference, while the verification process is designed to be quick, minimizing delay in the overall response time.
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 effectively suppresses electric arcs by ensuring no current flows to the light source until a valid activation command is received, even in cases of incomplete connections, enhancing safety and reducing noise interference.
Implementation Method 1
a voltage conversion circuit (22) configured to convert the first DC voltage (V1) into the second DC voltage (V2)
Implementation Method 2
a receiver circuit (31) configured to obtain the transmission data by detecting change in the voltage value of the second DC voltage (V2)
Implementation Method 3
The lighting device (1) is configured to light a light source (5) with the second DC voltage (V2)
Data Source
AI summary
A control circuit is configured to, when switching a state of a light source from an extinguished state to a lighting state, control a voltage conversion circuit so that a second DC voltage has a voltage value which changes according to transmission data containing an activation command. A lighting device is configured to keep the state of the light source at the extinguished state until receiving the activation command from the receiver circuit, and to change the state of the light source to the lighting state when receiving the activation command from the receiver circuit.