Intelligent Control Circuit for Traffic LED Signal Lamps
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Solution Overview
Problem
Traffic LED signal lamps experience high failure rates due to 'green conflict' and other issues like simultaneous red and green light activation, caused by short circuits and high voltage AC/DC driving power vulnerabilities, leading to reduced service life and reliability.
Innovation Solution
An intelligent control circuit for traffic LED signal lamps, featuring precise constant current modules, a CPU processor, fault detection board, and AC/DC switching module, which converts utility AC to low voltage DC for direct LED driving, eliminating high voltage issues and incorporating solar energy and backup power for reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage AC/DC driving power is used in traffic LED signal lamps, then the driving capability and brightness are improved, but the vulnerability to short circuits and breakdown increases, leading to high failure rates
Solution Approach 1:
The patent divides the single high voltage AC/DC driving power into multiple independent low voltage driving power modules (first driving power module, second driving power module, etc.). Each module independently drives specific LED signal lamps, isolating faults to individual modules rather than causing system-wide failures. This segmentation resolves the contradiction by maintaining sufficient driving capability through multiple modules while improving reliability through fault isolation.
Solution Approach 2:
The patent transforms the driving power parameters from high voltage AC/DC to low voltage DC through rectification and voltage regulation stages. By changing the voltage level and current characteristics, the system maintains adequate driving capability for LED brightness while significantly reducing the vulnerability to short circuits and breakdowns that occur with high voltage systems.
2Ease of operation
If bidirectional silicon controlled rectifier is used for high voltage driving, then the switching control capability is improved, but the inherent defects cause green conflict and simultaneous red-green light activation
Solution Approach 1:
The patent segments the control function by providing separate control circuits for each driving power module, with independent control over red, yellow, and green LED signals. This segmentation eliminates the green conflict problem by ensuring that control signals for different colors are independently managed and cannot be simultaneously activated in conflicting combinations.
Solution Approach 2:
The patent introduces a fault detection board as an intermediary component that monitors the工作状态 of all driving power modules and LED signals. This intermediary detects abnormal conditions such as green conflict or simultaneous red-green activation and triggers protective measures, thereby maintaining signal accuracy while preserving the switching control capability of the silicon controlled rectifiers.
3Device complexity
If built-in AC/DC driving power is provided in each signal lamp, then the system integration is improved, but the damage rate from transient high voltage impulsion at frequent switching increases
Solution Approach 1:
The patent extracts the AC/DC rectification and voltage regulation functions from individual signal lamps and consolidates them into a centralized power supply system. This external power supply system processes the AC to DC conversion and voltage regulation once, then distributes stable low voltage DC to multiple driving power modules, eliminating the transient high voltage impulses that would otherwise occur in each individual lamp's built-in AC/DC driver.
Solution Approach 2:
The patent implements protective circuits within each driving power module that provide beforehand cushioning against voltage spikes and transient impulses. These protective measures are built into the module design to absorb and dissipate transient high voltage before they can damage the LED components, thereby extending service life while maintaining system integration.
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 solution significantly reduces 'green conflict' and high failure rates, enhances service life, reliability, and safety, allowing the lamps to function even when wet, while improving energy efficiency and backup power performance.
Implementation Method 1
a driving power, configured to convert an utility electric alternating current into multiple direct currents for output
Implementation Method 2
a solar energy receiving device, in connection with the solar energy controller module, and configured to convert a received solar energy into the original solar electric source
Implementation Method 3
traffic LED signal lamps, in respective connection with output terminals of multiple precise constant current modules
Data Source
AI summary
An intelligent control circuit for a traffic LED signal lamp, including: a driving power, configured to convert an utility electric alternating current into multiple direct currents for output; multiple precise constant current modules, in one-to-one correspondence to the multiple direct currents, respectively, and configured to perform precise constant current processing on each of the multiple direct currents for output; and traffic LED signal lamps, in respective connection with output terminals of multiple precise constant current modules.