Switching Circuit Safeguard Against Erroneous Output Voltages
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing switch devices for vehicles do not appropriately handle erroneous output voltages from the output unit, which can lead to improper switching of the switch.
Innovation Solution
A switch device that includes an output unit, a switch, a resistor, a switching circuit, and a reduction circuit. The reduction circuit reduces the resistor voltage when all specific voltages output by the output unit reach or exceed an output threshold, ensuring appropriate switching of the switch even with erroneous output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switching circuit switches the switch on or off according to the resistor voltage without considering erroneous output voltages, then the switching operation is simple, but the reliability of switching control deteriorates when erroneous voltages occur
Solution Approach 1:
The reduction circuit performs preliminary action by detecting when all specific voltages are at or above the output threshold and proactively reducing the resistor voltage before erroneous switching can occur. This preventive measure ensures reliable switching control by eliminating the harmful state of erroneous high voltages before they can cause improper switch operation.
Solution Approach 2:
The reduction circuit acts as an intermediary between the output unit and the switching circuit. It monitors the output voltages and intervenes by reducing the resistor voltage when erroneous conditions are detected, thereby mediating the interaction between the output unit and switching circuit to prevent erroneous switching while maintaining normal switching functionality.
2Reliability
If the reduction circuit reduces the resistor voltage when all specific voltages are at or above the output threshold, then the reliability of switching control improves, but the device complexity increases
Solution Approach 1:
The reduction circuit is configured to automatically detect when all specific voltages are at or above the output threshold and autonomously reduce the resistor voltage without requiring external control signals. This self-service capability improves switching control reliability while minimizing the need for additional complex control logic or external intervention mechanisms.
3Device complexity
If no reduction circuit is provided, then the device complexity is low, but the switch may be improperly switched when erroneous voltages are output
Solution Approach 1:
The reduction circuit converts the harmful effect of erroneous high voltages into a beneficial protective function. By detecting when all specific voltages are at or above the output threshold and reducing the resistor voltage, the circuit transforms the potential harm of erroneous voltages that cause improper switching into a benefit where the erroneous state is automatically corrected and prevented from affecting switch operation.
Data Source
AI summary
In a switch device, an output voltage output by a microcomputer is input to one end of a resistor. A driving circuit switches a main switch on or off according to a resistor voltage at the other end of the resistor. When all of a plurality of specific voltages included in a plurality of output voltages output by the microcomputer are an output threshold or more, an AND circuit of an adjustment circuit reduces the resistor voltage.