Floor-Type Pedestrian Signals With Distributed Constant-Current Conversion
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Solution Overview
Problem
Conventional floor-type pedestrian signals experience degradation in brightness and lighting delays as they move away from the controller due to the use of constant current power, especially in wider crosswalks with increased numbers of signals, affecting visibility and causing confusion for pedestrians and drivers.
Innovation Solution
A system that converts voltage control power into constant current power for each pedestrian signal and applies it to an LED array based on control signals, using a daisy chain connection method to maintain consistent brightness and lighting times across multiple signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If constant current power is applied to a series connection of floor-type pedestrian signals, then the system is simple to control, but brightness degrades toward the end of the signal array
Solution Approach 1:
The patent divides the power supply system into independent modules, where each floor-type pedestrian signal operates as an independent unit with its own constant current power supply. This segmentation allows each signal to maintain consistent brightness without being affected by voltage drops in the series connection, while still enabling centralized control through the controller that manages each module independently.
Solution Approach 2:
The patent changes the power supply parameter from a unified constant current source to distributed constant current sources. Each signal module receives constant current power independently, changing the electrical parameter distribution from a single-point control to multiple-point control, thereby maintaining uniform brightness across all signals regardless of their position in the array.
2Device complexity
If multiple floor-type pedestrian signals are connected in series to reduce device complexity, then installation is easier, but lighting synchronization becomes difficult
Solution Approach 1:
The patent implements a feedback mechanism where each floor-type pedestrian signal module includes a constant current conversion module that monitors and adjusts its own power supply. The controller receives feedback from each module and independently controls the constant current power supply to each signal, ensuring synchronized lighting across all signals while maintaining the simplicity of series installation.
3Reliability
If floor-type pedestrian signals are installed in the ground to improve pedestrian visibility, then pedestrian safety is enhanced, but the signals are exposed to harsh environmental conditions
Solution Approach 1:
The patent embeds the electronic components and power supply modules within the structural housing of the floor-type pedestrian signal, nesting the sensitive electronics inside the protective enclosure that is installed in the ground. This nested structure protects the internal components from environmental factors like water and soil while maintaining the ground installation for pedestrian safety.
Solution Approach 2:
The patent introduces a protective housing and sealing structure as an intermediary between the ground environment and the electronic components. This intermediary layer (housing, seals, and protective coatings) shields the constant current conversion modules and LED arrays from direct exposure to water, soil, and mechanical damage while allowing the signal to function reliably in the ground installation.
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 ensures consistent brightness and synchronized lighting across a series of pedestrian signals, enhancing visibility for pedestrians while minimizing interference for drivers, even in wider crosswalks.
Implementation Method 1
a constant current conversion module configured to convert the voltage control power input to the input terminal into constant current power and output the constant current power
Implementation Method 2
an LED array including LED devices of a first color and a second color and built-in in the ground between a road and a sidewalk
Implementation Method 3
a plurality of floor-type pedestrian signals including a light emitting diode (LED) array including LED devices
Data Source
AI summary
The present invention provides a plurality of floor-type pedestrian signals, in which a control signal and voltage control power are applied, the voltage control power is converted into constant current power in each floor-type pedestrian signal, and the constant current power is applied to an LED array according to the control signal. Through this, the present invention prevents the brightness of the floor-type pedestrian signal from lowering as the distance from a controller increases, and maintains a constant lighting time of the plurality of floor-type pedestrian signals, so that even if the width of a crosswalk increases, the visibility of the floor-type pedestrian signal is kept constant.