Semiconductor Module Thermal Load Reduction in Airbag Control Unit
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Solution Overview
Problem
Control units for personal protection systems, such as airbag control units, face thermal limitations due to the heat load on semiconductor modules, restricting the number of functions that can be integrated, and existing solutions do not effectively manage power dissipation during battery underpower situations.
Innovation Solution
A second semiconductor module is introduced to share the energy reserve charging and supply power to sensors, reducing thermal load on the first module by parallel connection, and providing power from the vehicle battery during underpower conditions, thus increasing the power supply capabilities and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more functions are integrated into a single semiconductor module, then the functionality and performance of the control unit are improved, but the thermal load on the semiconductor module increases beyond permissible limits
Solution Approach 1:
The control unit is divided into multiple semiconductor modules (first semiconductor module 100 and second semiconductor module 111), each handling specific functions. The first module handles energy reserve charging and sensor power supply, while the second module handles sensor interfaces and communication, thereby distributing thermal load across separate modules while maintaining overall system functionality.
2Temperature
If a second semiconductor module is added to share power supply functions, then the thermal load on the first module is reduced, but the device complexity increases
Solution Approach 1:
The first and second semiconductor modules are merged into a single integrated circuit board 120, sharing common power supply connections and control logic. This physical integration reduces the complexity increase that would otherwise result from adding a separate module, while still achieving thermal load distribution through functional separation.
3Power
If the first semiconductor module charges the energy reserve alone, then the power supply capability is sufficient for basic functions, but the performance of the microcontroller and memory is limited
Solution Approach 1:
The energy reserve is pre-charged to a superelevated voltage level (20-50V) by both semiconductor modules before any high-power operations are needed. This preliminary charging action ensures that sufficient energy is available to support high-performance microcontroller operations and large memory configurations without exceeding thermal limits during actual operation.
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
This configuration reduces power dissipation and thermal load on the first semiconductor module, enabling higher performance and increased functionality while maintaining system functionality during battery underpower situations.
Implementation Method 1
The reduction in the losses that occur in the charging circuit of the first semiconductor module, specifically because of the finite internal resistance of the semiconductor module in up-conversion mode, are markedly reduced by parallel connection with the internal resistance of the second semiconductor module.
Data Source
AI summary
A control unit for triggering the personal protection arrangement, including a first semiconductor module that is configured to make available various supply voltages and to charge an energy reserve, and including at least one second semiconductor module that is likewise configured to charge the energy reserve, the first and the second semiconductor module each having a semiconductor support.