Power Management Bypass for Toll Road OBU Battery Life
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Solution Overview
Problem
In toll road information systems, on-board units (OBUs) equipped with nonchargeable batteries face challenges in power management to extend battery life, especially when power is unavailable, and existing systems fail to efficiently handle power transitions between vehicle batteries and backup batteries.
Innovation Solution
A power management system incorporating a bypass device, main boost converter, and linear regulators that dynamically adjust voltage levels to optimize power usage, preventing sudden switches to backup batteries during voltage drops and extending battery life by maintaining power supply from the vehicle battery as long as possible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a nonchargeable battery is used in the OBU, then the OBU can maintain standby function for annual periods, but the battery life is limited and requires strict power management
Solution Approach 1:
A power management system is introduced as an intermediary between the battery and the OBU components. This system includes voltage detection circuits, control logic, and power switching mechanisms that automatically manage power distribution, preventing direct user interaction complexity while extending battery life through intelligent standby mode control and selective component powering.
Solution Approach 2:
The power management system incorporates feedback mechanisms through voltage detection circuits that continuously monitor battery voltage levels and system power states. This feedback enables dynamic adjustment of power consumption, allowing the system to extend battery life by entering low-power modes when appropriate while maintaining operational readiness when needed.
2Reliability
If the OBU actively notifies the administration unit of its removal, then the system reliability is improved, but additional power consumption occurs
Solution Approach 1:
The notification system is designed to operate periodically or event-driven rather than continuously. The power management system monitors for removal events and triggers notifications only when necessary, reducing power consumption while maintaining reliable notification capability. This includes using low-power detection circuits that activate full notification only when removal is detected.
Solution Approach 2:
The notification system transitions between different power states dynamically. During normal operation, the system remains in a low-power state with minimal activity. When removal is detected, the system dynamically switches to an active state to send notifications, then returns to low-power state, optimizing the balance between reliability and power consumption.
3Reliability
If voltage drops occur during operation, then the system must switch to backup battery, but this causes sudden power transitions that may affect system stability
Solution Approach 1:
The power management system incorporates voltage detection and threshold-based control mechanisms that anticipate voltage drops before they cause system failure. When voltage approaches critical levels, the system proactively manages the transition to backup power sources, smoothing the transition process and preventing sudden power changes that could destabilize the system.
Solution Approach 2:
A power management circuit acts as an intermediary between the main power source and the OBU, and between backup power sources and the OBU. This intermediary smoothly manages power transitions by coordinating between multiple power sources, preventing sudden switches and maintaining stable voltage supply during transitions, thereby ensuring both reliability and stability.
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 extends the life of the backup battery by preventing unnecessary power draws from the backup battery during normal operation and ensuring continuous power supply to the OBU, even during sudden voltage drops, thereby enhancing the overall power management efficiency.
Implementation Method 1
when a main input voltage exceeds a threshold voltage, the bypass device is used to output the main input voltage to the node
Implementation Method 2
the main boost converter is used to up-convert the main input voltage to the threshold voltage to output the threshold voltage to the node
Implementation Method 3
The linear regulator is coupled to the node for down-converting the voltage at the node to provide a first voltage to a microprocessor
Data Source
AI summary
A power management system includes a bypass device, a main boost converter and a linear regulator. The bypass device is coupled to a node, when a main input voltage exceeds a threshold voltage, the bypass device is used to output the main input voltage to the node, and when the main input voltage is less than the threshold voltage, the bypass device is disabled. The main boost converter is coupled to the node, when the main input voltage is less than the threshold voltage, the main boost converter is used to up-convert the main input voltage to the threshold voltage to output the threshold voltage to the node, and when the main input voltage exceeds than the threshold voltage, the main boost converter is disabled. The linear regulator is coupled to the node for down-converting the voltage at the node to provide a first voltage to a microprocessor.