Stack DC Power Supply Battery Charger for LED Traffic Lighting
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Solution Overview
Problem
Conventional traffic lighting systems designed for incandescent bulbs, when retrofitted with LED lamps, suffer from inefficiencies due to redundant DC-AC and AC-DC conversions in traditional power supply systems, leading to unnecessary power losses and inefficiencies.
Innovation Solution
A power management system comprising a Power Management Unit (PMU) and a Service Bypass Unit (SBU) that dynamically adjusts power modes based on AC power quality, allowing for efficient DC power distribution to LED lamps, including a backup mode using a DC battery and a bypass mode to redirect power when the PMU is compromised.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional power supply systems with redundant DC-AC and AC-DC conversions are used in retrofitted LED traffic lighting systems, then the system can maintain compatibility with existing infrastructure, but power losses increase and energy efficiency deteriorates
Solution Approach 1:
The patent extracts and removes the redundant DC-AC conversion stage from the power supply system. By directly converting AC power to DC power for LED operation, the system eliminates the unnecessary intermediate conversion step, thereby reducing energy losses while maintaining system functionality.
Solution Approach 2:
The power supply unit is designed to perform multiple functions: it can operate in bypass mode during normal conditions and switch to battery power during outages. This multi-functionality allows the system to maintain compatibility with existing infrastructure while optimizing energy efficiency through direct AC-DC conversion when needed.
2Ease of repair
If the Power Management Unit is removed for maintenance or replacement, then system accessibility and ease of repair improve, but power supply reliability deteriorates unless bypass mode is activated
Solution Approach 1:
The system prepares for potential PMU removal by having the bypass mode pre-configured and the battery system ready. When the PMU needs maintenance, the system can seamlessly switch to bypass mode before removal, ensuring continuous power supply and eliminating downtime.
Solution Approach 2:
The bypass mode acts as an intermediary power path that can take over when the PMU is removed. This intermediary mechanism ensures that power continues to flow from the AC source directly to the load, maintaining reliability during PMU maintenance or replacement.
3Reliability
If AC power quality deteriorates with sags or swells, then power management becomes more challenging, but the Service Bypass Unit can detect these conditions and switch to appropriate operating modes
Solution Approach 1:
The Service Bypass Unit incorporates feedback mechanisms that continuously monitor AC power quality parameters such as voltage sags and swells. Based on this feedback, the system automatically detects poor conditions and switches to the appropriate operating mode, maintaining reliable operation under varying power quality conditions.
Solution Approach 2:
The system dynamically adjusts its operating mode based on real-time power quality conditions. The Service Bypass Unit can transition between bypass mode, normal PMU mode, and battery mode as needed, making the system adaptable and reliable under different AC power conditions without requiring overly complex manual intervention.
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 enhances power efficiency by eliminating redundant conversions, ensuring reliable operation even when the PMU is removed or compromised, and optimizing power flow to maintain traffic signal functionality with reduced energy consumption.
Implementation Method 1
a backup power source coupled to the power management unit
Implementation Method 2
converting, by the power management unit in the second mode of operation, the AC power to a second DC power
Data Source
AI summary
According to at least one aspect, embodiments herein provide a method for operating a battery charging system, the method comprising receiving, by a first rectifier, a first AC voltage, receiving, by a second rectifier, a second AC voltage, converting, by the first rectifier, the first AC voltage to a first DC voltage, converting, by the second rectifier, the second AC voltage to a second DC voltage, biasing, by the second rectifier, the first rectifier with the second DC voltage, biasing, by the second rectifier, a battery charger with the second DC voltage, providing, by the first rectifier, a biased voltage to the battery charger, and providing, by the battery charger, a second power to a battery.