Vehicle Safety Unit Activation Voltage Control Circuit
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Solution Overview
Problem
Existing safety systems for vehicles, such as airbag activation, face challenges in efficiently providing activation voltage while minimizing power consumption and preventing accidental deployments.
Innovation Solution
A device with a pass-through switch and control switches is designed to provide a switchable, high-/low-impedance trigger high-side supply voltage, ensuring reliable activation voltage provision with low power consumption and redundancy for increased reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety semiconductor is designed to provide activation voltage for airbag deployment, then the reliability of safety function is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic power management by switching the safety semiconductor between active and sleep modes. The control unit monitors collision detection signals and dynamically activates the activation voltage provision only when collision is detected, otherwise keeping the system in sleep mode to minimize power consumption while maintaining safety functionality.
Solution Approach 2:
The system employs periodic monitoring of collision detection signals rather than continuous activation. The control unit periodically checks for collision conditions and only activates the high-power activation voltage provision when needed, creating a periodic action pattern that reduces overall power consumption while ensuring safety reliability.
2Reliability
If the activation voltage is continuously provided to ensure reliable airbag deployment, then the reliability of safety function is improved, but the risk of accidental deployment increases
Solution Approach 1:
The patent introduces a control unit as an intermediary between the collision detection signal and the activation voltage provision. This control unit verifies collision conditions and mediates the activation process, ensuring that activation voltage is provided only when genuine collision is detected, thereby preventing accidental deployment while maintaining reliable safety function.
Solution Approach 2:
The system implements feedback control where the control unit continuously monitors collision detection signals and adjusts the activation voltage provision accordingly. The feedback mechanism ensures that activation occurs only when verified collision conditions are met, preventing accidental deployment while ensuring reliable safety response.
3Reliability
If multiple control switches and resistors are added to reduce power consumption and prevent accidental deployment, then the reliability and power efficiency are improved, but the device complexity increases
Solution Approach 1:
The patent merges the control functions into a integrated control unit that manages multiple switches and resistors. By combining the control logic for power management and safety verification into a single control unit, the system reduces overall complexity while maintaining the benefits of multiple control elements for power efficiency and safety.
Solution Approach 2:
The control unit is designed with multi-functionality, serving both power management (controlling sleep/active modes) and safety verification (monitoring collision signals) functions. This universal control element reduces the need for separate dedicated components, thereby reducing device complexity while achieving multiple safety and efficiency goals.
Data Source
AI summary
A device for providing an activation voltage for a safety unit for a vehicle. The device includes a supply terminal for applying a first supply voltage potential, an activation terminal for outputting the activation voltage, and a control terminal for reading in a control signal. In addition, the device includes a pass-through switch that is connected between the supply terminal and the activation terminal, a first control switch, a second control switch, and a third control switch that includes a control input that is connected to the control terminal.