Overvoltage Protection Circuit Checking via Single Voltage Tap
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Solution Overview
Problem
Existing overvoltage protection circuits in electric machines lack a simple and reliable method to check their functionality, leading to potential premature activation of safety mechanisms and unnecessary downtime.
Innovation Solution
An overvoltage protection circuit with a series connection of at least two overvoltage protection units, each with a switching unit in parallel, allows for easy functionality checks by measuring voltage at a single tap point, using semiconductor switching elements and diodes to limit voltage and detect defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional overvoltage protection circuits are used without a simple checking method, then the system can operate continuously, but the reliability decreases due to potential undetected defects and premature safety mechanism activation
Solution Approach 1:
The overvoltage protection circuit performs self-diagnosis by using its own switching units and voltage taps to measure and evaluate the functionality of its protection components. The circuit tests itself by switching between operational and test modes, eliminating the need for external diagnostic equipment or complex separate checking mechanisms.
Solution Approach 2:
The circuit incorporates a feedback mechanism where the measured voltage at the voltage tap is compared against expected values to determine the functional state of overvoltage protection units. This feedback loop enables automatic detection of defects and triggers appropriate safety responses only when necessary.
2Measurement precision
If multiple voltage taps are used to check each overvoltage protection unit individually, then the measurement precision improves, but the device complexity and ease of operation worsen
Solution Approach 1:
A single voltage tap serves as an intermediary measurement point that provides information about the state of multiple series-connected overvoltage protection units. By measuring at this intermediate point and using switching units to isolate specific sections, the system can diagnose individual units without requiring separate taps for each component.
Solution Approach 2:
The overvoltage protection circuit is divided into multiple series-connected protection units, each with its own switching unit. This segmentation allows the system to test individual units by switching them in and out of the measurement circuit, enabling precise diagnosis of specific components through a single voltage tap measurement.
3Reliability
If the overvoltage protection circuit is checked continuously during operation, then the reliability improves by detecting defects early, but the use of energy and device complexity increase
Solution Approach 1:
The functionality check is performed periodically or at scheduled intervals rather than continuously. The switching units activate test modes at predetermined times to measure voltage at the tap point, then return to normal operation. This periodic checking maintains reliability by detecting defects early while minimizing energy consumption by keeping the system in low-power operational mode between checks.
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 method quickly and reliably determines the functionality of the overvoltage protection circuit, reducing the risk of premature safety mechanism activation and minimizing downtime by identifying defects before system operation.
Implementation Method 1
each overvoltage protection component limiting a voltage, dropping across this component, to a component voltage limit. In one embodiment, an overvoltage protection component includes a diode, in particular a suppressor diode or Zener diode
Implementation Method 2
The switching unit includes a switching element, in particular a semiconductor switching element, for example a MOSFET or IGBT
Implementation Method 3
a resistor component for limiting a current flow through the switching element
Data Source
AI summary
An overvoltage protection circuit for an electric machine has a series connection of at least two overvoltage protection units, each having a switching unit connected in parallel. Each overvoltage protection unit includes at least one overvoltage protection component that limits a voltage, dropping across this component, to a component voltage limit. At least one of the overvoltage protection units includes at least two overvoltage protection components. A voltage tap is provided between two of overvoltage protection components. A method of checking the overvoltage protection circuit includes detecting a voltage present at the overvoltage protection circuit, switching the switching units into different switching configurations and determining a measured value of a voltage present at the voltage tap in each of the switching configurations, comparing the measured values in each case to an associated comparative value, and determining the functionality of the overvoltage protection circuit based on comparison result.