Optical Coupling Device with Concentrated Electric Field for Noise Shielding
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Solution Overview
Problem
Conventional optical coupling devices face issues with parasitic capacitance and increased costs due to the need for a light-transmitting conductive layer to shield displacement current, which also reduces the effective light-receiving surface area and signal-to-noise ratio.
Innovation Solution
The optical coupling device incorporates a first conductive part with a concentrated electric field point that is separated from the light-receiving part, reducing parasitic capacitance and eliminating the need for a light-transmitting conductive layer, thereby enhancing common-mode transient rejection and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-transmitting conductive layer is added to shield displacement current, then noise resistance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the light-transmitting conductive layer from the conventional structure. By repositioning the conductive plates and creating concentrated electric field points away from the light-receiving surface, the patent achieves noise shielding without requiring the additional light-transmitting layer, thus reducing structural complexity while maintaining noise resistance
Solution Approach 2:
The patent introduces concentrated electric field points as intermediary elements between the conductive plates. These concentrated field points serve as mediators that redirect electric field distribution away from the light-receiving surface, providing noise shielding functionality without the need for a light-transmitting conductive layer
2Reliability
If a light-transmitting conductive layer is added to shield displacement current, then noise resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes the light-transmitting conductive layer from the manufacturing process. By achieving noise shielding through geometric arrangement of conductive plates and concentrated electric field points, the patent eliminates the need to manufacture and assemble this additional layer, thereby reducing manufacturing cost
Solution Approach 2:
The patent replaces the expensive light-transmitting conductive layer with a simpler geometric configuration of existing conductive plates. This substitution uses readily available materials and standard manufacturing processes, significantly reducing production costs while achieving the same noise resistance function
3Reliability
If a light-transmitting conductive layer is added to shield displacement current, then noise resistance is improved, but the effective light-receiving surface area is reduced
Solution Approach 1:
The patent extracts and removes the light-transmitting conductive layer that was blocking part of the light-receiving surface. By achieving noise shielding through electric field concentration and geometric arrangement instead, the patent restores the full light-receiving surface area while maintaining noise resistance
Solution Approach 2:
The patent shifts the noise shielding mechanism from a two-dimensional surface layer (light-transmitting conductive layer covering the surface) to a three-dimensional electric field distribution pattern. By concentrating electric fields at specific points in space away from the surface, the patent achieves shielding without occupying the light-receiving surface area
4Reliability
If a light-transmitting conductive layer is added to shield displacement current, then noise resistance is improved, but signal-to-noise ratio is reduced
Solution Approach 1:
The patent removes the light-transmitting conductive layer that was attenuating the optical signal. By achieving noise resistance through electric field concentration and geometric arrangement, the patent eliminates the signal attenuation effect while maintaining noise shielding, thus preserving the signal-to-noise ratio
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 configuration effectively reduces parasitic capacitance and transient voltage variations caused by common-mode noise, enhancing noise resistance without the need for a light-transmitting conductive layer, thus improving the signal-to-noise ratio and reducing manufacturing costs.
Implementation Method 1
a light-emitting part 4, which converts an electrical signal to light and emits the light
Implementation Method 2
a light-receiving part 51, which converts light from the light-emitting part 4 to an electrical signal
Implementation Method 3
the first conductive part 31 has a point on which an electric field generated by a potential difference between the primary conductive plate 2 and the secondary conductive plate 3 is concentrated
Data Source
AI summary
An optical coupling device includes a primary conductive plate, a light-emitting part, a secondary conductive plate, a light-receiving part, and a first conductive part. The light-emitting part is located on the primary conductive plate, converts an electrical signal to light, and emits the light. The secondary conductive plate is spaced apart from the primary conductive plate, and faces the light-emitting part. The light-receiving part is disposed on the secondary conductive plate to face the light-emitting part, and converts light from the light-emitting part to an electrical signal. The first conductive part is disposed at a side facing the light-emitting part, and has a point on which an electric field generated by a potential difference between the primary conductive plate and the secondary conductive plate is concentrated.