Field Collapse Pulser for Repeatable ESD Characterization
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Solution Overview
Problem
Current electrostatic discharge (ESD) testing methods, such as IEC 61000-4-2 'gun' testing, are unsatisfactory due to lack of repeatability, variability in operator and lab conditions, and electromagnetic compatibility issues, making it difficult to characterize and optimize ESD protection systems effectively at the system level.
Innovation Solution
A field collapse pulser is developed to provide a repeatable and cost-effective means of generating high-current pulses comparable to ESD stress, allowing for characterization of ESD susceptibility in both powered and unpowered systems without the risks associated with traditional Transmission Line Pulse (TLP) testing, using a fixed capacitor stack and isolated contact points for safe connection to devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IEC 61000-4-2 'gun' testing is used for ESD qualification, then system level ESD testing can be performed, but repeatability and measurement precision deteriorate due to operator and lab condition variability
Solution Approach 1:
The patent creates a controlled laboratory model that copies the essential characteristics of real ESD events using a rechargeable capacitor stack and controlled discharge circuitry. This artificial ESD generator replicates the pulse characteristics (current, voltage, duration) of actual ESD events without the variability introduced by human operators or uncontrolled environmental factors, thereby achieving both reliability and measurement precision.
Solution Approach 2:
The patent employs adjustable parameters including variable capacitance values (through different capacitor stacks), controllable discharge rates, and adjustable voltage levels. These parameters can be precisely controlled and replicated across multiple tests, enabling repeatable ESD pulse generation that maintains consistent characteristics while adapting to different testing requirements.
2Reliability
If traditional ESD testing methods are used, then ESD protection systems can be tested, but device complexity and cost increase due to expensive equipment and expertise requirements
Solution Approach 1:
The patent divides the ESD testing system into separate functional modules: a rechargeable capacitor stack for energy storage, a controlled discharge circuit for pulse generation, and a load circuit for ESD protection characterization. This segmentation allows each component to be independently designed, tested, and replaced, reducing overall system complexity while maintaining testing capability.
Solution Approach 2:
The patent implements a self-contained ESD generator that can be recharged and reused without external equipment. The capacitor stack can be recharged through a simple circuit, and the entire system can be operated independently without requiring complex external power supplies or specialized test equipment, thereby reducing device complexity and cost.
3Power
If Transmission Line Pulse (TLP) testing is used for ESD stress testing, then high-current pulses can be generated, but safety risks and equipment damage potential increase
Solution Approach 1:
The patent incorporates several safety features including current-limiting resistors, voltage clamping circuits, and controlled discharge pathways that prevent excessive current or voltage from damaging equipment. The capacitor stack is designed with inherent protection mechanisms, and the discharge circuit includes protective elements that activate before damage can occur, thereby cushioning against harmful effects while still enabling high-current pulse generation for ESD testing.
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 field collapse pulser offers a reliable and affordable solution for debugging ESD and transient soft-failures, enabling detailed characterization and optimization of ESD protection systems with repeatable and verifiable results, reducing the need for expensive equipment and expertise.
Implementation Method 1
The pulser includes a capacitor stack that can be charged and discharged to generate the desired pulse. The capacitor stack is configured to store electrical energy during charging and release it rapidly during discharge to create high-current pulses comparable to ESD events.
Implementation Method 2
The field collapse pulser generates electrostatic discharge-like pulses by rapidly discharging stored capacitive energy through the device under test, creating transient current pulses that replicate ESD stress conditions for testing and characterization.
Data Source
AI summary
Disclosed are exemplary embodiments of electrostatic discharge (ESD) pulse generators that may provide improved system level ESD robustness characterization and qualification analysis.