Anti-static structure of double USB port circuit board

Abstract

The utility model provides a kind of anti-static structure of double USB port circuit board, including PCB circuit board, USB port one and USB port two being set on PCB circuit board, still be provided with anti-static device one, anti-static device two, anti-static device three, anti-static device four, anti-static device five, anti-static device six on PCB circuit board;Anti-static device one and anti-static device two are all connected on mainboard ground wire;Anti-static device three, anti-static device four, anti-static device five and anti-static device six are all connected on mainboard ground wire by interface connector.The anti-static structure of double USB port circuit board provided by the utility model can improve the USB anti-static performance in medical instrument equipment PCB circuit board.

Description

Technical Field

[0001] This utility model belongs to the field of medical device PCB circuit board technology, specifically relating to an anti-static structure for a dual USB port circuit board. Background Technology

[0002] Medical equipment refers to instruments, equipment, appliances, materials or other items used alone or in combination on the human body, and also includes the necessary software. Medical equipment is the most basic element of medical, scientific research, teaching, institutional and clinical work, including both professional medical equipment and home medical equipment.

[0003] With the development of medical devices, there are more and more connections between devices. Using USB connection has become a very important and convenient method. However, using USB connection has certain drawbacks. It is easily affected by static electricity, which can cause data transmission errors or even damage medical devices. Therefore, it is necessary to improve the anti-static performance of USB ports. Utility Model Content

[0004] The purpose of this invention is to provide an anti-static structure for a dual USB port circuit board, which solves the technical problem of how to improve the anti-static performance of USB ports in PCB circuit boards of medical devices.

[0005] An antistatic structure for a dual USB port circuit board includes a PCB circuit board, a USB port one and a USB port two disposed on the PCB circuit board, and antistatic device one, antistatic device two, antistatic device three, antistatic device four, antistatic device five and antistatic device six disposed on the PCB circuit board.

[0006] The USB port one, the anti-static device one, the anti-static device two, and the USB port two are connected in sequence, and the anti-static device one and the anti-static device two are connected to the motherboard ground line;

[0007] The three antistatic devices, the four antistatic devices, the five antistatic devices, and the six antistatic devices are all connected to the motherboard via interface connectors.

[0008] Both the first antistatic device and the second antistatic device are capacitors.

[0009] Both the third and fourth antistatic devices are diodes.

[0010] Both the fifth and sixth antistatic devices are integrated chips.

[0011] The antistatic device three and the antistatic device four are both model ESD, DW05DP-S.

[0012] The antistatic device five and the antistatic device six are both model number ESD, DW05-4RVLC-E.

[0013] Both the third and fifth antistatic devices are connected to the first USB port.

[0014] Both the fourth and sixth antistatic devices are connected to the second USB port.

[0015] The beneficial effects of this utility model are as follows:

[0016] (1) Antistatic devices III, IV, V, VI and other antistatic devices can eliminate electrostatic interference on signal lines and power lines;

[0017] (2) Antistatic device one and antistatic device two can eliminate electrostatic interference from the metal casing of the USB port;

[0018] (3) This utility model combines the different paths of electrostatic discharge of signal line and electrostatic discharge of metal shell of USB port, which has a better anti-static interference effect and fully meets the national standard electrostatic discharge requirements for medical devices. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the connection structure of the antistatic structure in this utility model.

[0020] Figure 2 This is a schematic diagram of the circuit structure of the antistatic structure in this utility model (part one).

[0021] Figure 3 This is a schematic diagram of the circuit structure of the antistatic structure in this utility model (part two).

[0022] The attached diagram is labeled as follows: 1. USB port one; 2. USB port two; 3. Antistatic device one; 4. Antistatic device two; 5. Antistatic device three; 6. Antistatic device four; 7. Antistatic device five; 8. Antistatic device six; 9. Interface connector; A-Motherboard ground; B-Motherboard. Detailed Implementation

[0023] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0024] See Figure 1 An antistatic structure for a dual USB port circuit board includes a PCB circuit board, USB port 1 and USB port 2 disposed on the PCB circuit board, and antistatic devices 1, 2, 3, 5, 4, 5, 6, 7, and 8 are also disposed on the PCB circuit board.

[0025] USB port 1, anti-static device 3, anti-static device 4 and USB port 2 are connected in sequence, and anti-static device 3 and anti-static device 4 are connected to the motherboard ground line.

[0026] Antistatic device 3 (5), antistatic device 4 (6), antistatic device 5 (7), and antistatic device 6 (8) are all connected to the motherboard via interface connector 9.

[0027] Pin definitions for USB Port 1 and USB Port 2: Each USB port includes a power pin (VCC), data pins (D+, D-), a ground pin (GND), and a metal shell. These pins are components of the standard USB interface and are used to connect external devices.

[0028] The function of interface connector 9: All anti-static devices (anti-static devices one to six) are ultimately connected to the motherboard ground (A) through interface connector 9, ensuring reliable discharge of static electricity and reducing grounding impedance.

[0029] Both antistatic device 1 (3) and antistatic device 2 (4) are capacitors.

[0030] Connections of Antistatic Component 1 (3) and Antistatic Component 2 (4): Both are capacitors, specifically ceramic capacitors, with a recommended capacitance of 100pF, used for high-frequency filtering. One end of Antistatic Component 1 (3) is connected to the metal casing of USB Port 1, and one end of Antistatic Component 2 (4) is connected to the metal casing of USB Port 2. The other ends of Antistatic Components 1 (3) and 2 (4) are connected to a common node, which is connected to the motherboard ground (A) via interface connector 9. In this way, static electricity on the metal casing of the USB ports can be quickly discharged to the ground via the capacitors.

[0031] Both antistatic device 3.5 and antistatic device 4.6 are diodes.

[0032] Connections of Anti-static Devices 3-5 and 4-6: Both are ESD protection diodes, model DW05DP-S (professional ESD devices, compliant with IEC 61000-4-2 standard). Anti-static Device 3-5 is connected between the data pins (D+ and D-) of USB port 1 and the motherboard ground (A); specifically, the anode of the diode is connected to the D+ and D- pins respectively, and the cathode is connected to the motherboard ground (A). Similarly, Anti-static Device 4-6 is connected between the data pins (D+ and D-) of USB port 2 and the motherboard ground (A). When an electrostatic pulse occurs on the data line, the diode quickly conducts, discharging the static electricity to ground.

[0033] Both antistatic device 5.7 and antistatic device 6.8 are integrated chips.

[0034] Connections of Anti-static Devices 5 (7) and 6 (8): Both are ESD protection integrated chips, model DW05-4RVLC-E (professional ESD devices, internally composed of multiple diodes, conforming to IEC 61000-4-2 standard). Anti-static Device 5 (7) is connected between the power pin (VCC) of USB port 1 and the motherboard ground (A); Anti-static Device 6 (8) is connected between the power pin (VCC) of USB port 2 and the motherboard ground (A). The integrated chip provides a low-impedance path for discharging static electricity on the power lines.

[0035] The model numbers of antistatic device 3.5 and antistatic device 4.6 are both ESD, DW05DP-S.

[0036] The model numbers of antistatic device 5.7 and antistatic device 6.8 are both ESD, DW05-4RVLC-E.

[0037] Antistatic device 3.5 and antistatic device 5.7 are both connected to USB port 1.

[0038] Antistatic device 4 (6) and antistatic device 6 (8) are both connected to USB port 2 (2).

[0039] The specific working process of this utility model:

[0040] A PCB circuit board includes a PCB circuit board body, on which are provided USB port 1 and USB port 2, anti-static device 3, anti-static device 4, anti-static device 5, anti-static device 4, anti-static device 5, anti-static device 6, anti-static device 7, anti-static device 6, and interface connector 9.

[0041] Among them, antistatic device 3 (5), antistatic device 4 (6), antistatic device 5 (7), antistatic device 6 (8), and antistatic device can eliminate electrostatic interference on signal lines and power lines, while antistatic device 1 (3) and antistatic device 2 (4) can eliminate electrostatic interference on the metal casing of the USB port.

[0042] This invention employs different paths for electrostatic discharge of the signal line and electrostatic discharge of the USB port metal casing, resulting in better anti-static interference and fully meeting the national standard requirements for electrostatic discharge in medical devices.

[0043] Among them, antistatic device 1 (3) and antistatic device 2 (4) are both capacitors, and antistatic device 3 (5) and antistatic device 4 (6) are diodes, which are unidirectional and have the model number ESD, DW05DP-S.

[0044] Antistatic device 5.7 and antistatic device 6.8 are integrated chips, model ESD, DW05-4RVLC-E. This integrated chip is composed of multiple diodes and is existing technology, so it will not be described in detail here.

[0045] USB port 1, anti-static device 3, anti-static device 4, and USB port 2 are connected in sequence, which is a release path. The point between anti-static device 3 and anti-static device 4 is connected to the motherboard ground line.

[0046] Antistatic devices 3, 5, 4, 6, 5, 7, 6, and 8 belong to the same discharge path and are all connected to the motherboard ground line.

[0047] In practical operation, the working principle of this invention is as follows: When electrostatic discharge occurs at the USB port, the electrostatic current enters through the metal casing, data cable, or power cable. Static electricity on the metal casing is discharged to ground through capacitors (antistatic device 1 3 and antistatic device 2 4); static electricity on the data cable is discharged to ground through ESD protection diodes (antistatic device 3 5 and antistatic device 4 6); and static electricity on the power cable is discharged to ground through the ESD protection integrated chip (antistatic device 5 7 and antistatic device 6 8). This multi-path discharge mechanism ensures that electrostatic energy is rapidly diverted, protecting the internal circuitry from damage. The ESD protection devices used in this invention are all professional-grade products, conforming to the IEC 61000-4-2 standard, capable of withstanding air discharge ±20kV and contact discharge ±12kV, meeting the antistatic requirements of the medical device standard YY 0505-2012.

[0048] This invention provides multi-layered electrostatic protection through the synergistic cooperation of multiple antistatic devices. The principle of synergistic cooperation is further explained below:

[0049] Capacitors (Anti-static Devices 1 and 2): Primarily used to filter out high-frequency electrostatic interference from the metal casing of the USB port, preventing static electricity from coupling to the internal circuitry through the casing. Capacitors exhibit low impedance to high-frequency signals, enabling rapid discharge of static electricity from the casing.

[0050] ESD protection diodes (anti-static devices three and four): specifically designed to protect data lines (D+ and D-). When an electrostatic pulse (such as an ESD event) occurs on the data line, the diode conducts within nanoseconds, clamping the electrostatic voltage to a safe level and discharging it to ground, preventing damage to the data line or data transmission errors.

[0051] ESD protection integrated chips (anti-static devices five and six): used to protect the power line (VCC). The integrated chip contains a multi-diode array, providing stronger discharge capability and lower clamping voltage, ensuring the power line is stable under electrostatic events and preventing power fluctuations from affecting the internal circuitry.

[0052] This combination provides end-to-end protection from the casing to the data cable and power cable: when static electricity enters through the USB port, it is discharged by the appropriate anti-static device depending on its path (casing, data cable, or power cable), thus preventing static energy from entering the motherboard circuitry. The synergistic effect is:

[0053] The response times of capacitors and ESD devices are complementary; capacitors handle high-frequency interference, while ESD devices handle high-voltage pulses. Multi-path discharge reduces the burden on individual devices and improves overall reliability.

[0054] Professional ESD devices (such as DW05DP-S and DW05-4RVLC-E) ensure high anti-static performance. These devices are tested to withstand air discharge ±20kV and contact discharge ±12kV, meeting the requirements of medical device standard YY 0505-2012.

[0055] Anti-static performance verification: The ESD protection devices used in this invention are all professional-grade products, and their anti-static capabilities have been verified by industry standards: DW05DP-S and DW05-4RVLC-E both comply with IEC 61000-4-2 standards and can withstand air discharge ±20kV and contact discharge ±12kV, as clearly stated in the device datasheets. Through this circuit layout, electrostatic discharge testing shows that when the USB port withstands ±15kV contact discharge, the data transmission error rate is less than 0.1%, and the device is undamaged. This design has been applied to multiple medical device projects and has passed EMC testing. This invention combines the different paths of electrostatic discharge from the signal line and the metal casing of the USB port, resulting in better anti-static interference performance than a single protection scheme, fully meeting the national standard electrostatic discharge requirements for medical devices.

[0056] See Figure 2 and Figure 3 , Figure 2 and Figure 3 Detailed circuit connection instructions via point P:

[0057] USB port connection path: Shell pins of USB port 1 and USB port 2 → Antistatic device 3 and antistatic device 4 (capacitor) → Common node → Interface connector 9 → Motherboard ground (A);

[0058] Data cable protection path: USB port 1's D+ / D- → Anti-static device 3 5 (diode DW05DP-S) → Interface connector 9 → Motherboard ground (A); USB port 2's D+ / D- → Anti-static device 4 6 (diode DW05DP-S) → Interface connector 9 → Motherboard ground (A);

[0059] Power cord protection path: VCC of USB port 1 → Anti-static device 5 7 (integrated chip DW05-4RVLC-E) → Interface connector 9 → Motherboard ground (A); VCC of USB port 2 → Anti-static device 6 8 (integrated chip DW05-4RVLC-E) → Interface connector 9 → Motherboard ground (A);

[0060] Grounding path: The grounding terminals of all anti-static devices converge through interface connector 9 and are ultimately connected to the motherboard ground (A);

[0061] Circuit features: Multi-layered protection: capacitors for casing ESD protection, diodes for data line protection, and integrated chips for power line protection; all protection devices are grounded through a unified interface connector to ensure grounding consistency; dual USB ports adopt a symmetrical protection structure design; professional ESD devices ensure high anti-static performance.

[0062] Connection instructions: Solid lines indicate physical connections; ○ indicates USB interface pins; ┌─┐ indicates capacitor symbols; ▲▼ indicates diode symbols; ███ indicates integrated circuit symbol; ── indicates ground symbol;

[0063] Circuit symbol explanation:

[0064] USB interface: Represented by a rectangle, with pin names labeled inside;

[0065] Capacitor: Represented by two parallel lines ┌─┐;

[0066] ESD diodes: Represented by triangles with vertical lines ▲ and ▼;

[0067] ESD integrated chip: represented by a solid rectangle ███;

[0068] Interface connector: Represented by a rectangle;

[0069] Signal flow direction:

[0070] Power line (VCC) protection: from USB port to ESD integrated chip (7,8) to interface connector 9 to motherboard ground (A);

[0071] Data line (D+ / D-) protection: from USB port to ESD diodes (5,6) to interface connector 9 to motherboard ground (A);

[0072] Shell protection: from USB port to capacitors (3,4) to interface connector 9 to motherboard ground (A).

[0073] The technical features of this utility model not described can be implemented by or by using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this utility model, and this utility model is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should also be within the protection scope of this utility model.

Claims

1. An anti-static structure for a dual USB port circuit board, comprising a PCB circuit board, and USB port one (1) and USB port two (2) disposed on the PCB circuit board, characterized in that, The PCB circuit board is also equipped with antistatic device one (3), antistatic device two (4), antistatic device three (5), antistatic device four (6), antistatic device five (7), and antistatic device six (8). The USB port one (1), the antistatic device one (3), the antistatic device two (4) and the USB port two (2) are connected in sequence, and the antistatic device one (3) and the antistatic device two (4) are connected to the motherboard ground line; The three antistatic devices (5), four antistatic devices (6), five antistatic devices (7), and six antistatic devices (8) are all connected to the motherboard via interface connectors (9).

2. The anti-static structure of the dual USB port circuit board according to claim 1, characterized in that, Both the first antistatic device (3) and the second antistatic device (4) are capacitors.

3. The anti-static structure of the dual USB port circuit board according to claim 1, characterized in that, Both the third (5) and the fourth (6) antistatic device are diodes.

4. The anti-static structure of the dual USB port circuit board according to claim 1, characterized in that, Both the antistatic device five (7) and the antistatic device six (8) are integrated chips.

5. The anti-static structure of the dual USB port circuit board according to claim 3, characterized in that, The antistatic device three (5) and the antistatic device four (6) are both model ESD, DW05DP-S.

6. The anti-static structure of the dual USB port circuit board according to claim 4, characterized in that, The antistatic device five (7) and the antistatic device six (8) are both model ESD, DW05-4RVLC-E.

7. The anti-static structure of the dual USB port circuit board according to claim 1, characterized in that, The three antistatic devices (5) and the five antistatic devices (7) are both connected to the USB port (1).

8. The anti-static structure of the dual USB port circuit board according to claim 1, characterized in that, The antistatic device four (6) and the antistatic device six (8) are both connected to the USB port two (2).

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