Pressure Sensor Neutralization Plate for Static Discharge
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Solution Overview
Problem
Semiconductor pressure sensors used in refrigeration and air conditioning devices face issues with static electricity and potential differences between the diaphragm and the semiconductor device, leading to malfunctions, and existing solutions require complex structures to neutralize these issues without simplifying the design or maintaining the pressure receiving space height.
Innovation Solution
A pressure sensor design featuring a neutralization plate connected to an earth terminal pin, which is positioned at the same height or lower than the semiconductor pressure detecting device, effectively neutralizing static electricity by using an earth bonding wire with a larger diameter than other bonding wires, and can be formed in various shapes with a window hole or slit, ensuring reliable operation without enlarging the sensor's height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive member is arranged between the semiconductor pressure detecting device and the diaphragm to achieve neutralization, then static electricity and potential difference problems are resolved, but the structure becomes more complex and the height of the pressure receiving space must be enlarged
Solution Approach 1:
The neutralization plate is integrated with the base structure, merging the neutralization function into an existing component rather than adding a separate conductive member between the diaphragm and semiconductor device. This eliminates the need for additional structural elements while maintaining the neutralization effect.
Solution Approach 2:
Instead of increasing the height of the pressure receiving space (vertical dimension), the neutralization plate is positioned at the periphery of the base (horizontal dimension). This dimensional shift allows neutralization without enlarging the pressure receiving space height.
2Reliability
If a conductive member is arranged between the semiconductor pressure detecting device and the diaphragm to achieve neutralization, then static electricity and potential difference problems are resolved, but the pressure receiving space height must be enlarged
Solution Approach 1:
The neutralization plate is positioned at the periphery of the base in the horizontal plane rather than extending vertically into the pressure receiving space. This dimensional repositioning achieves neutralization without increasing the pressure receiving space height.
Solution Approach 2:
The neutralization plate is placed specifically at the peripheral position of the base where it can effectively neutralize static electricity without interfering with the central pressure receiving space. This localized positioning maintains the required height while providing the necessary neutralization function.
3Device complexity
If the neutralization plate is positioned at the periphery of the base, then the structure is simplified and height is maintained, but the neutralization effectiveness may be reduced
Solution Approach 1:
The earth bonding wire serves as an intermediary conductor, electrically connecting the neutralization plate at the base periphery to the earth terminal pin. This ensures effective neutralization of static electricity while maintaining the simplified peripheral positioning of the neutralization plate.
Solution Approach 2:
The base structure serves multiple functions: it supports the semiconductor pressure detecting device, contains the pressure receiving space, and provides the mounting position for the neutralization plate. This multi-functionality maintains structural simplicity while achieving effective neutralization.
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 provides enhanced resistance to electromagnetic noise and static electricity, ensuring high reliability and preventing malfunctions while maintaining the sensor's size and simplicity of manufacturing.
Implementation Method 1
the neutralization plate is electrically connected to an earth pad of the semiconductor type pressure detecting device and the earth terminal pin
Implementation Method 2
using an earth bonding wire with a larger diameter than other bonding wires
Data Source
AI summary
The invention prevents a pressure receiving space of a pressure sensor from being electrically charged. In a pressure sensor, a diaphragm is attached to a base which is fixed within a cover and a pressure receiving space in which an oil is sealed is formed. A semiconductor type pressure detecting device is connected to a plurality of terminal pins by a bonding wire. A neutralization plate attached to a periphery of the semiconductor type pressure detecting device or a part of the periphery thereof is connected to an earth terminal pin by an earth bonding wire, or is connected to the earth terminal pin by a soldering so as to prevent an insulative medium sealed within the pressure receiving space from being electrically charged.