Current Transient Suppression Circuit for Test Systems
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Solution Overview
Problem
Conventional test and measurement systems fail to effectively suppress current transients, leading to destructive currents in devices under test, especially as device geometries shrink, and existing protection circuits are inadequate in handling fast transients and ultra-low current performance.
Innovation Solution
The implementation of a current transient suppression circuit with galvanically isolated switching elements and series inductance, which shunts excess current to ground or another node away from the device under test, using a combination of inductors, transformers, diodes, and switching devices to provide fast and effective protection across a wide range of voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protection circuits (crowbar circuits with silicon-controlled rectifiers) are used, then overvoltage protection is provided, but the circuits cannot operate fast enough to suppress fast transients and cannot achieve ultra-low current performance
Solution Approach 1:
The patent replaces conventional electronic protection circuits (silicon-controlled rectifiers) with a mechanical relay-based protection circuit. The relay mechanically opens or closes contacts to divert transient currents, providing fast response to voltage transients while achieving ultra-low leakage current performance that electronic circuits cannot attain. The mechanical switching action provides both speed and reliability for protecting against fast transients.
Solution Approach 2:
The patent introduces a mechanical relay as an intermediary device between the circuit under test and ground. This relay acts as a mediator that detects voltage transients and mechanically connects or disconnects the shunt path to ground, providing isolation and protection while maintaining ultra-low leakage current. The mechanical intermediary enables both fast transient response and picoamp-level current performance.
2Reliability
If series resistors are added to the test setup to minimize excessive current effects, then current transient damage is reduced, but the ability to perform higher current tests is eliminated unless resistance is removed
Solution Approach 1:
The patent implements a dynamic protection circuit using a mechanical relay that can switch between different circuit configurations. The relay dynamically connects or disconnects the shunt path based on detected voltage transients, providing protection only when needed. This allows the circuit to maintain full current capability during normal operation while providing automatic protection during transient events, achieving both device protection and test versatility.
Solution Approach 2:
The protection circuit is self-regulating through the mechanical relay that automatically detects voltage transients and activates the shunt path without external intervention. The circuit monitors itself and provides protection only when transients are detected, allowing full current range testing during normal operation while automatically protecting against excessive currents during transient events.
3Reliability
If dynamic variable series resistance is implemented in series with the circuit branch, then current transient suppression is improved, but circuit complexity and reconfiguration requirements increase
Solution Approach 1:
The patent extracts the protection function from the main current path by using a parallel shunt circuit activated by a mechanical relay. Instead of placing variable resistance in series with the circuit branch, the protection mechanism is taken out as a separate parallel path that activates only during transients. This reduces circuit complexity while maintaining effective transient suppression, as the shunt path does not interfere with normal current flow or require reconfiguration.
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 solution provides robust protection against current transients, allowing for higher static DC currents without voltage drops and enabling ultra-low current performance, even with high voltage inputs, by quickly diverting excess current away from the device under test, thus preventing damage.
Implementation Method 1
An inductor is electrically connected to a test signal by an input of the inductor
Implementation Method 2
at least one switching device electrically connected to an output of the inductor; and an output of the at least one switching device connected to a shunt path
Data Source
AI summary
A current transient suppression circuit includes an inductor electrically connected to a test signal by an input of the inductor, at least one switching device electrically connected to an output of the inductor, and an output of the at least one switching device connected to a shunt path. A method of suppressing current transients in a circuit includes receiving a test signal at an inductor, and when the test signal comprises a current transient, the current transient is received at the inductor, activating at least one switching device electrically connected to the inductor to shunt the current transient away from a device under test.