Vehicle Power Source System Dynamic Pre-Charging Control
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Solution Overview
Problem
The existing power source systems for vehicles face instability during pre-charging due to increased consumption power from auxiliary devices, which can lead to insufficient power from the auxiliary power source, causing unstable operations of other devices.
Innovation Solution
A power source system that includes a main power source, an auxiliary power source, a power converter, a relay, a boost converter, and a controller, where the controller pre-charges the capacitor by setting the output current of the boost converter to a first value during initializing processes of specific auxiliary devices and increases it to a second value after completion, ensuring stable pre-charging without power insufficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output current of the boost converter is increased to reduce pre-charging time, then productivity is improved, but the auxiliary power source may become insufficient when auxiliary devices are activated, causing instability
Solution Approach 1:
The output current of the boost converter is made dynamic rather than fixed. The control device adjusts the output current based on the operational state of auxiliary devices: when auxiliary devices are not activated, the output current is set to a higher second current value to reduce pre-charging time; when auxiliary devices are activated, the output current is reduced to a first current value to ensure sufficient power supply and maintain stability. This dynamic adjustment resolves the contradiction between productivity and reliability.
Solution Approach 2:
The control device monitors the activation state of auxiliary devices and uses this feedback information to adjust the output current of the boost converter accordingly. The control device determines whether auxiliary devices are activated and adjusts the current between the first current value (when activated) and the second current value (when not activated), creating a closed-loop control system that adapts to changing conditions and maintains optimal performance.
2Reliability
If the output current of the boost converter is reduced to ensure sufficient power for auxiliary devices, then reliability is improved, but the pre-charging time increases
Solution Approach 1:
The system dynamically adjusts the output current based on actual power supply needs. When auxiliary devices are activated and require more power, the output current is reduced to the first current value to ensure reliable power supply. When auxiliary devices are not activated and power demand is lower, the output current is increased to the second current value to accelerate pre-charging. This dynamic behavior allows the system to optimize for reliability when needed and for productivity when conditions permit.
Solution Approach 2:
The control device periodically monitors the activation state of auxiliary devices during the pre-charging process and adjusts the output current accordingly. This periodic checking and adjustment allows the system to switch between the first current value and the second current value as needed, enabling the system to maintain reliability during critical periods while maximizing productivity during safe periods.
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 enables stable pre-charging of capacitors even when various auxiliary devices are connected, reducing the risk of power insufficiency and minimizing the time required for pre-charging by adjusting the output current based on the devices' processes.
Implementation Method 1
a boost converter having a low voltage terminal thereof connected to the auxiliary power source and having a high voltage terminal connected to the power converter
Data Source
AI summary
A power source system may include a main power source, a power converter including a capacitor, a relay configured to switch between connection and disconnection between the power converter and the main power source, an auxiliary power source, a boost converter having a low voltage terminal thereof connected to the auxiliary power source, and having a high voltage terminal thereof connected to the power converter without interposing the relay, and a controller configured to pre-charge the capacitor prior to placing the relay in a connected state. During the pre-charging of the capacitor, the controller may be configured to set an output current of the boost converter to a first current value while a specific auxiliary device connected to the auxiliary power source executes a specific process, and change the output current to a second current value larger than the first current value after the execution is completed.