Thermopile Flow Sensor Layout for ESD Breakdown Protection
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Solution Overview
Problem
Thermopile-based flow sensors are susceptible to electrostatic discharge (ESD) which can damage the transducer and negatively impact performance, posing risks to both the sensor and the patient if used in medical applications.
Innovation Solution
The implementation of thermopiles with rounded corners and an electrostatic discharge (ESD) protection circuit, including diodes that divert current away from sensitive components during an ESD pulse, along with a heating structure designed with curved corners to reduce current density and prevent breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sharp corners are used in thermopile junctions and heating structures, then manufacturing is easier, but electrostatic discharge damage occurs and reliability deteriorates
Solution Approach 1:
The patent applies curvature by replacing sharp corners with rounded corners in thermopile junctions and heating structures. This geometric modification reduces electrostatic field concentration at corners, preventing ESD-induced breakdown while maintaining manufacturability through standard fabrication processes that can produce rounded features.
2Reliability
If ESD protection circuits are added, then reliability improves, but device complexity increases
Solution Approach 1:
The patent introduces ESD protection circuits as intermediary components that mediate between external electrostatic threats and sensitive internal components. These protection circuits act as a buffer, absorbing or diverting ESD energy before it reaches the thermopile and heating structures, thereby protecting the core functionality without requiring fundamental redesign of the sensor.
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 effectively protects the thermopile-based flow sensing apparatus from ESD, ensuring reliable operation and preventing potential harm to patients by maintaining sensor integrity and performance.
Implementation Method 1
a heating structure disposed over the membrane structure and configured to heat the heated area
Implementation Method 2
a first thermopile including a plurality of first thermocouples disposed upstream of the centerline... and a second thermopile including a plurality of second thermocouples disposed downstream of the centerline
Data Source
AI summary
Various methods, apparatuses, and systems for sensing a flow of fluid are provided. The apparatus includes, but not limited to: a membrane structure defining a heated area; a heating structure disposed over the membrane structure and configured to heat the heated area, where the heating structure has a centerline; a first thermopile including a plurality of first thermocouples disposed upstream of the centerline, where at least a portion of the plurality of first thermocouples are disposed over the membrane structure and at least one junction of the plurality of first thermocouples has rounded corners; and a second thermopile including a plurality of second thermocouples disposed downstream of the centerline, where at least a portion of the plurality of second thermocouples are disposed over the membrane structure and at least one junction of the plurality of second thermocouples has rounded corners.