USB Power Delivery Device Voltage Adjustment for Start-Stop Transients
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Solution Overview
Problem
USB Power Delivery devices in vehicles face disruptions during start-stop transients, where vehicle battery voltage dips, causing current input to exceed limits and potentially shutting down the device due to inconsistent power supply.
Innovation Solution
A USB Power Delivery device with a buck-boost DC-DC converter and controller that adjusts output voltage based on vehicle power state signals, switching from high to low voltage during start-stop events to maintain stable charging without exceeding current limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the USB Power Delivery device maintains high output voltage during start-stop transients, then fast charging capability is preserved, but current input exceeds limits causing device shutdown
Solution Approach 1:
The patent implements dynamic voltage adjustment by switching between first and second output voltages based on the vehicle's power state. The controller monitors vehicle power state indicators and dynamically changes the output voltage of the DC-DC converter accordingly, allowing the system to adapt to changing electrical conditions during start-stop transients.
Solution Approach 2:
The patent changes the electrical parameter (output voltage) of the DC-DC converter based on vehicle operating conditions. By switching between different voltage levels (first output voltage during normal operation, second output voltage during start-stop transients), the system maintains reliable operation while preventing current exceedance during transient events.
2Reliability
If the device reduces output voltage during start-stop events, then current input limits are maintained, but charging speed decreases
Solution Approach 1:
The patent employs periodic switching between different voltage modes based on the cyclic nature of start-stop transients. The controller periodically monitors vehicle power state and switches between first and second output voltages in response to transient events, enabling the system to maintain high voltage during normal charging (for fast charging) and switch to lower voltage only during brief transient periods when current limits would be exceeded.
3Stability of the object's composition
If the DC-DC converter switches between voltage modes, then power supply stability is maintained, but device complexity increases
Solution Approach 1:
The patent implements a feedback control mechanism where the controller monitors vehicle power state indicators and uses this information to determine when to switch between different output voltage modes. This feedback-based approach maintains power supply stability by responding to actual vehicle electrical conditions while keeping the control logic relatively simple through clear threshold-based decision making.
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
Ensures uninterrupted power supply to USB devices during start-stop events by reducing power requirements, preventing device shutdown and maintaining charging sessions, while reducing electrical load on the vehicle system.
Implementation Method 1
a buck-boost DC-DC converter in communication with the vehicle battery and the USB device, and a controller in communication with the start-stop controller, the DC-DC converter, and the USB device
Data Source
AI summary
An electrical power supply device is configured to communicate with a start-stop controller that automatically shuts down and restarts an internal combustion engine in a vehicle. The device includes a DC-DC power convertor and a device controller. The DC-DC power convertor is configured to produce a first voltage or a second voltage that is less than the first voltage. The device controller which causes the DC-DC power convertor to produce the first voltage in response to a run signal from the start-stop controller and also causes the DC-DC power convertor to produce the second voltage in response to a stop signal from the start-stop controller.