By LEIDITECH | 28 June 2024 | 0 Comments
USBStatic and surge protection of interfaces
USByesUniversal Serial Bus（universal serial bus ）Abbreviations for，It is a common external bus standard，Used to standardize the connection and communication between computers and other electronic devices。USBTechnology makes data transmission simpler and faster，And it supports plug and play functionality，That is to say，Users can connect or disconnect while the computer is runningUSBequipment，No need to restart the computer or perform complex settings。
As technology evolves，From the beginningUSB 1.xreachUSB 2.0、USB 3.x、USB 3.2、USB4 and nowUSB4 andUSB Type-C，Significant improvement in transmission speed and power management capabilities，Satisfying the needs of modern devices for high-speed data exchange and efficient charging。
electrostatic discharge （ESD）And surges（Surge）yesUSBCommon threats faced by interfaces。Static surges not only directly damage hardware，It may also cause data transmission interruption or reduce the overall performance of the device。
To ensureUSBStability and security of interfaces，Effective protective measures must be included in the design。Common protective components includeESDdiodeAnd transient voltage suppressors（TVS）。ESDDiodes can respond quickly when detecting high voltage，Guide excess charge towards the ground wire，To avoid damage to sensitive circuits。TVSDiodes can absorb and limit transient voltage during surges，Protect the circuit from damage。in addition，Low junction capacitanceESDProtective devices are commonly used for high-speed data cables，To minimize the impact on signal quality，And gas discharge tubes（GDT）Suitable for handling high-energy surges，As the first level of protection，Effectively releasing a large amount of energy。
Shanghai Leimao has advanced equipment and a professional team，Can be based onIEC61000-4-2 andIEC61000-4-Provide customers with recommended solutions based on the testing standards of 5 and the anti-static requirements of the product itself。Here is Lei Mao's discussion onUSBBrief description of electrostatic surge protection scheme：
1.1.1：USB2.0 Static protection scheme
Advantages of the plan：USB2.0 provides 500MbpsTransmission speed of，Lei Mao adopts single device protection,Save space，Ensure signal integrity，SR05 satisfyIEC61000-4-2，Level 4，Contact discharge 20kV，Air discharge 20kV。SR05W satisfyIEC61000-4-2，Level 4，Contact discharge 30kV，Air discharge 30kV,Performance has increased by 7 times，Ensure various electrical interferences for industrial customers。As forVbusThere are overcurrent requirements，Required configurationPTCprotect。
1.1.2 USB2.0 Static protection scheme(2)
Advantages of the plan：USB2.0 provides 500MbpsTransmission speed of，Lei Mao adopts single device protection,Save space， Ensure signal integrity，USBLC6-2SC6 Connected between the 1st and 6th legs of the，satisfyIEC61000-4-2，Level 4，Contact discharge 25kV，Air discharge 30kV，Ensure various electrical interferences for industrial customers。As forVbusThere are overcurrent requirements，Required configurationPTCprotect。
1.2 doubleUSB2.0 Static protection scheme
Advantages of the plan：USB2.0 provides 500MbpsTransmission speed of，Lei Mao uses a single device to protect 2USB,Save space， Ensure signal integrity，satisfyIEC61000-4-2，Level 4，Contact discharge 8kV，Air discharge 15kV。
As forVbusThere are overcurrent requirements，Required configurationPTCprotect。
1.3 USB3.0/TYPE-C Static protection scheme
Advantages of the plan：USB3.0 provides 5.0GbpsTransmission speed of，Lei Mao adopts single device protection,Save space， Ensure signal integrity，satisfyIEC61000-4-2，Level 4，Contact discharge 8kV，Air discharge 15kV
1.4 USB3.0/TYPE-C Static protection scheme
Advantages of the plan：USB3.0 provides 5.0GbpsTransmission speed of，Lei Mao adopts discrete device protection,Ensure signal integrity satisfyIEC61000-4-2，Level 4，Contact discharge 8kV，Air discharge 15kV。
1.5 mobile phoneUSBPort static surge protection scheme
Advantages of the plan：Lei Mao adopts Level 2 protection,Save space，Provide front-end protection for surge devices,Suitable for international markets。 Post stage adoptionDFN1006-3-way anti-static device，satisfyIEC61000-4-2，Contact discharge 30kV，Air discharge 30kV。
1.6 USBWith fast charging and electrostatic protection voltage of 5V 12V 36V
Advantages of the plan：USB2.0 provides 500MbpsTransmission speed of，Lei Mao adopts single device protection,Save space， Ensure signal integrity，satisfyIEC61000-4-2，Level 4，Contact discharge 20kV，Air discharge 25kV。
For fast charging voltage 5V/12V/36VAll have corresponding devices。
1.7 USB3.0/TYPE-C Electrostatic filtering protection scheme
Advantages of the plan：USB3.0 provides 5.0GbpsTransmission speed of，Lei Mao adopts multiple integrated devices for protection, Can save space，Can ensure signal integrity，Can filter out noise，satisfyIEC61000-4-2（Level 4），Contact discharge 25kV，Air discharge 25kV 。
1.8 USB3.1 The electrostatic protection scheme for the second generation interface
USB 3.1 Section The second generation integrates Tx/Rx Differential line，Speed up to 10 Gbps。At these speeds，Electrostatic discharge protection Capacitors must be minimized，To maintain signal integrity。
Solution:ESD Solution Tx/Rx Linear USB 3.1 Gen 2 There should be one 0.3 pF Or lower capacitors have Signal integrity purpose，The working voltage is>3.6 V。One solution is 4 passageway ESD Equipment ultra-low capacitance data cable (Tx,Rx)， Combining low capacitance 2 passageway ESD Equipment used for D+/D -and VBUS Single channel of the line ESD equipment。
1.9 USB2.0-USB3.1 Static electricity protection scheme for interfaces
background：USBInterface from 2.From 0 to the present 3.1 Gen 2,Data rate from 480Mbps reach 10Gbps，The data rate is getting higher and higher，Therefore, the capacitance requirements for electrostatic discharge protection devices are becoming smaller and smaller，To maintain signal integrity。
Solution: USB 3.1 Gen 2 of Tx/Rx lineESD The capacitance should be 0.5 pF Or lower，The working voltage is>3.6 V。The following solution is a 3 passageway ESD ，Ultra low capacitance（0.25PF)。
This oneESD protectUSBThe four pins of the connector（VCC、D-、D+andGnd），Therefore, both the power and data cables are protected。aboutUSB3.1 Gen Two can use three，aboutUSB2.0 can use one
1.10 USB-PDStatic surge protection scheme for fast charging power supply
PDThe full name of isUSB Power Delivery Specification，yesUSBA fast charging standard launched by the standardization organization。
USB-PD Standard support through compatible USB The cable provides power to the system up to 240W。
VBUS The commonly used voltage for pins is 12V、15V 、24V。
Lei Mao adoptsleiditech encapsulation DFN2020-3 (2mm x 2mm)The series provides a protection solution for fast charging with small volume and high power。
1.11 USB4 High speed interface electrostatic surge protection scheme
Advantages of the plan：USB4 Interface support up to 40Gbps Data transmission speed，Lei Mao adopts a low junction capacitance of 0.2PF,Small volumeDFN0603 Packaging,Bring back the discrete components for scanningESDProtection plan, Convenient wiring，Ensure signal integrity，Can filter out noise，satisfyIEC61000-4-2（Level 4）。
Lei Mao has a detailed plan and wiring diagram，And recommended model parameters。Please contact Lei MaoEMCLittle brother requests it。
Lei Mao mainly provides anti-static measuresTVS/ESDAnd relatedEMCcomponent（Discharge tubeTSS/GDT、Stabilizing tubeZENER、VaristorMOV、Rectifier diodeRECTIFIER、Self recovery fusePPTC、Field-effect transistorMOSFET、inductance）。
Surrounded by Lei MaoEMCEMC service customers，Self built free laboratory for testing static electricity for customersESD（30KV）、Group pulseEFT(4KV)、surge（8/20，10/700 10/1000）、Car load shedding（7637 5a/5b）Performance testing of components, etc。LeiditechKeeping up with the pulse of domestic and international technological updates，Continuously innovatingEMCProtection scheme and related devices，Target direction is small packaging，High power，Provide reliable solutions and components for domestic substitution。
From static electricity to surges，Comprehensive protection：Summary of protection design schemes for
Static surge protection and filtering schemes for common audio and video interfaces
Leave a Reply
Your email address will not be published.Required fields are marked. *
POPULAR BLOG
- AC Servo Motor EMI Tracing and Complete Link EMC Protection Solution
- Industrial Sensor 4-20mA Loop-Powered Transmitter ESD and Surge Protection Solution
- EMC Protection Design for All Interfaces of Fully Automated Fecal Analyzers
- Leiditech Lightning and ESD Protection Solution for the Rongpin Rockchip RD-RK3588-AHD AI Expansion
- Technical Analysis of Graded ESD and Surge Protection for Medical-Grade Semi-Automated Thromboelasto