Voltage Protection Arrangement with Self-Healing Switch
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Solution Overview
Problem
Existing voltage protection circuits for electronic devices, particularly in automation technology, often result in permanent disconnection due to overvoltage, requiring service intervention for repair, and lack the ability to detect undervoltages effectively.
Innovation Solution
A voltage protection arrangement with a switch-off unit and a voltage detection unit, utilizing electronic switches and comparators with hysteresis, allowing self-healing operation and simultaneous detection of overvoltage and undervoltage, enabling the electronic device to resume operation once voltages return to safe levels without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse is used in the overvoltage protection circuit, then the electronic device is protected from destructive overvoltages, but the electronic device is permanently disconnected and requires service intervention for repair
Solution Approach 1:
The patent implements a self-healing protection mechanism where the electronic switch automatically opens during overvoltage conditions and closes again when voltage returns to normal levels, eliminating the need for service intervention. The control unit monitors voltage continuously and autonomously controls the switch state, allowing the system to serve itself without external repair actions.
Solution Approach 2:
The patent replaces the mechanical fuse (which requires physical replacement) with an electronic switch controlled by an electronic control unit. This substitution allows for automated, reversible protection - the electronic switch can be opened and closed through electrical control signals rather than requiring mechanical replacement, enabling the system to restore operation automatically after overvoltage events.
2Device complexity
If a simple overvoltage protection circuit is used, then the device structure is simple, but the device cannot detect undervoltages or provide error messages
Solution Approach 1:
The patent implements a multi-functional protection system where the control unit performs multiple functions: monitoring overvoltage conditions, monitoring undervoltage conditions, controlling the electronic switch, and generating error messages. This single control unit handles all protection and detection functions, providing versatility without requiring separate dedicated circuits for each function, thus maintaining relative simplicity while achieving comprehensive monitoring capabilities.
Solution Approach 2:
The patent employs dynamic voltage threshold comparison where the control unit continuously compares the supply voltage against predefined upper and lower threshold values. The system adaptively responds to changing voltage conditions by switching the electronic switch state and generating appropriate error messages based on real-time voltage levels, enabling flexible detection of both overvoltage and undervoltage conditions within a single dynamic control framework.
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 solution ensures the electronic device is protected from destructive overvoltages and undervoltages, allowing it to automatically recover and maintain operation within a safe voltage range, enhancing reliability and safety without the need for service intervention.
Implementation Method 1
the voltage detection unit has a voltage comparator and a switching or signal output connected to the output of the voltage comparator for reporting an impermissible voltage
Implementation Method 2
when an impermissible voltage U1 is present at the input of the disconnection unit, the electrical switch is opened and when a permissible voltage U2 is then applied, the switch is closed again
Implementation Method 3
the voltage detection unit has a test stage through which the function of the voltage comparator of the voltage detection unit and the switching or signal output connected thereto can be tested without influencing the electrical switch
Data Source
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AI summary
The invention relates to a voltage protection arrangement for an electronic device, in particular for a control system in automation engineering. The voltage protection arrangement has a greater functionality, and therefore also a greater range of applications, due to the fact that said arrangment has a switching-off unit (2) and a voltage detection unit (4) connected to the output (3) of the switching-off unit (2), wherein the switching-off unit (2) has a voltage comparator (7) and a normally electrically closed switch (10) connected to the output (8) of the voltage comparator (7), arranged between the input (9) and the output (3) of the switching-off unit (2), wherein the voltage detection unit (4) has a voltage comparator (12) and a switch output (14) connected to the output (13) of the voltage comparator (12) for signalling an impermissible voltage, and wherein, in the event of an impermissible voltage Ui occurring at the input (9) of the switching-off unit (2), the electrical switch (10) is opened and, in the event of a subsequent permissible voltage U2 occurring, the switch (10) is closed again.