A high-coupling ESD protection PCB structure
By introducing an optimized layout of transformers, ESD devices, ferrite beads, and resistors into the PCB structure, the problem of insufficient ESD protection in traditional PCB layout is solved, achieving rapid electrostatic discharge and improved signal integrity, thus meeting the miniaturization requirements of electronic devices.
Patent Information
- Application Number
- CN202522466459.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-11-20
AI Technical Summary
Traditional PCB layout design suffers from excessively long trace distances in terms of ESD protection, leading to increased signal transmission delays, insufficient coupling, and inability to effectively release electrostatic charges, thus affecting the performance and reliability of electronic components.
The PCB structure with high coupling is adopted, including PCB substrate, transformer, ESD device, ferrite bead and resistor. Short traces are designed and a common pad structure is adopted. Differential trace coupling is used to avoid right angles and sharp angles. The layout is optimized to reduce signal interference and delay.
It improves the response speed of ESD protection, reduces signal transmission interference and delay, enhances the ESD resistance of electronic devices, achieves higher performance and stability, and meets the requirements of miniaturization.
Smart Images
Figure CN224947758U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PCB technology, and in particular to an ESD protection PCB structure with high coupling degree. Background Technology
[0002] In electronic devices, electrostatic discharge (ESD) can damage electronic components, affecting the performance and reliability of the equipment. Traditional PCB layout designs have some shortcomings in ESD protection, such as excessively long trace distances, which increase signal transmission delays and also increase the paths for ESD interference; insufficient coupling, which prevents ESD protection components from functioning effectively and from dissipating electrostatic charges in time, thus damaging sensitive components.
[0003] Therefore, existing technologies have shortcomings and need to be improved. Utility Model Content
[0004] The purpose of this invention is to overcome at least some of the shortcomings of the prior art and provide an ESD protection PCB structure with high coupling.
[0005] The technical solution of this utility model is as follows: This utility model provides an ESD protection PCB structure with high coupling, including: a PCB substrate, and a transformer, ESD device, ferrite bead and resistor disposed on the PCB substrate. The ESD device is arranged horizontally on the PCB substrate, and the ESD device is disposed close to the pin of the transformer. The transformer is electrically connected to the electrostatic sensitive element on the PCB substrate through a short trace, and the ESD device, ferrite bead and resistor are all disposed on the short trace. The ferrite bead and resistor are disposed on the PCB substrate with a common pad structure.
[0006] Furthermore, the short traces connecting the transformer and the sensitive element are arranged to run through the center of the ESD device, and two adjacent short traces are differential traces, wherein the short traces in the differential traces are of equal length and are coupled to each other.
[0007] Furthermore, the length of the short trace is less than or equal to 424 mil.
[0008] The advantages of this invention, achieved by adopting the above scheme, are as follows: Shorter trace distances allow ESD current to quickly reach and be released from the protective components, reducing the risk of damage to sensitive components. Higher coupling ensures that the ESD protection components can respond to ESD events promptly and effectively, enhancing the device's ESD resistance. Optimized trace design and reasonable inter-layer layout reduce interference and delay during signal transmission, improving signal integrity and contributing to higher performance and stability in electronic devices. The compact layout design and the use of multi-layer PCB structures effectively reduce PCB size while maintaining functionality, meeting the miniaturization needs of electronic devices. Attached Figure Description
[0009] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.
[0010] Figure 2 for Figure 1 Enlarged view of the location indicated by the superscript number. Detailed Implementation
[0011] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0012] Please refer to the following: Figure 1 and Figure 2 This invention provides a highly coupled ESD protection PCB structure, including: a PCB substrate (not shown), and a transformer 1, an ESD device 2, a ferrite bead, and a resistor disposed on the PCB substrate. The ESD device 2 is arranged horizontally on the PCB substrate, and is positioned close to the pins of the transformer 1. It is worth noting that the horizontal arrangement of the ESD device 2 means that the ESD connection traces are arranged horizontally as a whole. Therefore, the horizontal arrangement of the ESD device 2 allows it to maintain a relatively close and co-directional structure with the trace trajectory. This avoids the problem of vertical ESD device placement requiring the traces to follow the vertical lines of the ESD device 2, helps reduce trace length, and prevents the ESD device 2 from occupying excessive vertical space. The transformer 1 is electrically connected to the electrostatic sensitive element on the PCB substrate via a short trace 4. The ESD device 2, the ferrite bead, and the resistor are all disposed on the short trace 4. Specifically, in this embodiment, the length of the short trace 4 does not exceed 424 mil (10.5 mm). The ferrite bead and resistor are disposed on the PCB substrate using a shared pad 3 structure to achieve surge protection.
[0013] Furthermore, the short traces 4 connecting the transformer 1 and the sensitive element are arranged to run through the center of the ESD device 2, and two adjacent short traces 4 are differential traces, with the short traces 4 of the differential traces being of equal length and coupled to each other.
[0014] Furthermore, in the routing structure of short trace 4, sharp angles or right angles are avoided in the line to reduce reflections and interference during signal transmission.
[0015] In this design, the ESD device 2 is placed close to the pins of transformer 1, and the ferrite bead and resistor share a common pad 3 to achieve a protective effect. In the routing design, short traces are used to connect the sensitive component and the ESD protection component. Short traces 4 directly reduce the ESD current transmission path, lower resistance and inductance, and improve the response speed of ESD protection. Right angles or acute angles are avoided (obtuse angles, rounded corners, etc. are used for routing) to reduce reflections and interference during signal transmission and improve signal integrity. In the ESD protection path, this optimized routing shape helps the ESD current flow more smoothly, improving the protection effect. In the coupling design, the ESD device 2 is placed horizontally, achieving equal-length traces and basic coupling of differential traces.
[0016] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A highly coupled ESD-protected PCB structure, characterized in that, include: The PCB substrate, and the transformer, ESD device, ferrite bead and resistor disposed on the PCB substrate. The ESD device is arranged horizontally on the PCB substrate and is located close to the pin of the transformer. The transformer is electrically connected to the electrostatic sensitive element on the PCB substrate through a short trace. The ESD device, ferrite bead and resistor are all disposed on the short trace. The ferrite bead and resistor are disposed on the PCB substrate with a common pad structure.
2. The ESD protection PCB structure with high coupling degree according to claim 1, characterized in that, The short traces connecting the transformer and the sensitive element are arranged to run through the center of the ESD device, and two adjacent short traces are differential traces. The short traces in the differential traces are of equal length and are coupled to each other.
3. The ESD protection PCB structure with high coupling degree according to claim 1 or 2, characterized in that, The length of the short trace is less than or equal to 424 mil.