USB Power Distribution Prioritization During Engine Restart Sag
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current power distribution devices for vehicles face instability when the engine is restarted after a no-idling state, leading to potential fuse burnout and disruption of power supply to USB-compatible devices due to decreased battery voltage, as they lack a step-up unit and current limiting circuits that can manage increased power demands.
Innovation Solution
A power distribution device with multiple ports that includes a detection unit for no-idling states, a negotiation mechanism to reduce power supply to non-preferred devices while maintaining supply to preferred ones, and a step-up/down portion to manage voltage, preventing fuse burnout and ensuring continuous operation of critical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the maximum power supply to USB compatible devices is increased to meet improved functionality requirements, then the power supply capability is improved, but the risk of fuse burnout increases when battery voltage decreases during engine restart
Solution Approach 1:
The power supply device dynamically adjusts the maximum power supply capability based on battery voltage conditions. When battery voltage is normal, the device supplies power up to the maximum capability (e.g., 60W). When battery voltage decreases during engine restart, the device automatically reduces the maximum power supply to a safe level, preventing fuse burnout while maintaining the ability to supply high power when conditions permit
Solution Approach 2:
The control unit changes the power supply parameters (voltage and current limits) based on real-time battery voltage detection. By adjusting these parameters dynamically, the system achieves both high power supply capability under normal conditions and protection against fuse burnout when battery voltage sags during engine restart
2Productivity
If power supply to all devices is maintained at maximum level, then the device performance is improved, but the battery voltage stability deteriorates during engine restart
Solution Approach 1:
The system applies different power supply strategies to different devices based on their priority classification. Preferred devices (e.g., audio display unit, smartphone for communication) receive priority power allocation and voltage stabilization during engine restart. Non-preferred devices have their power supply reduced or suspended during critical moments when battery voltage sags, ensuring that overall system performance is maintained while protecting battery voltage 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 solution effectively reduces power supply to non-preferred devices during no-idling states and restores it upon engine restart, preventing fuse burnout and ensuring continuous operation of preferred devices like smartphones, even with decreased battery voltage.
Implementation Method 1
a step-up/down portion for stepping up or down the battery voltage supplied from the battery
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A USB power distribution unit according to an embodiment of the present invention has a function of distributing power supplied from a battery to a smartphone connected to a preferred port and a mobile battery connected to a non-preferred port. The USB power distribution unit includes a no-idling detection portion, an engine restart detection portion, a PD negotiation portion, and a step-up/down portion, and causes the PD negotiation portion to determine the amount of power supply to the mobile battery when a no-idling state is detected.