By LEIDITECH | 02 July 2024 | 0 Comments

Lei Mao's one-stop solution to electrostatic surge and interface safety in electronic equipment

In the rapidly evolving digital age，Electronic devices are not only the core of daily life，It's also industrial automation、Intelligent Wearing、The cornerstone of smart homes and even future transportation。however，With the continuous expansion of technological boundaries，The challenges faced by the equipment are becoming increasingly severe，Especially from electrostatic discharge(ESD)、The threat of surge impact and electromagnetic interference，They are like invisible assassins，Silently eroding the stability and service life of electronic products。to this end，Building a comprehensive set of services、An efficient protection system is particularly important，To ensure that each one“Electronic heart”Can bounce strongly in complex and ever-changing environments，Safe and worry free。

From Power Carrier Communication to Bluetooth Speaker，From gallium nitride semiconductor applications toTWSwirelessBluetooth earphones，From precision sensors toLEDIntelligent lighting，And electrostatic and surge protection strategies for display screens and smart wearable devices。This article，Lei Mao will take you on an exploratory journey，Revealing the mystery of electrostatic surge protection。

1.1 Power carrier wavePLCModule application solution

Whole machine product design end，L，N Online safety protection design，PLC Signal coupling design，Lei Mao strongly recommends referring to the following circuit diagram，Reduce damage caused by surges and other factorsPLCModule damage

explain:The first level bidirectional in the figureTVSProtective tube（D1/D2）Required；

L/NOnlinePLCThe signal access point needs to be connected to a varistor（RV1）behind;

PLCTwo differential mode inductors need to be connected in series after the signal（L1/L2）Isolate from the power supply of the entire machine;

T1 transformer is 1:1 Transformer；

C1 safety capacitor。

1.2Carrier signal surge protection scheme

P0300SCSemiconductor discharge tubes for carrier coupled signal protection devices，It has an ultra fast response speed，IHStable value，Minimal signal attenuation，Features such as strong sustained anti-interference ability。

Advantages of the plan：While ensuring signal integrity，Through surge testing。satisfyIEC61000-4-5 10/700μs 6KV。

2.1sensor（4-20mA）Electrostatic protection scheme

Lei Mao adoptsS1MAndLC2401CWProtection routine 4-20mA24 Powered Sensitive Sensorschip

Advantages of the plan：Small package，Low capacitance，High current protection。satisfyIEC61000-4-2，Level 4，Contact discharge 30kV，Air discharge 30kV。

3.1Bluetooth speaker control board electrostatic surge protection scheme

Bluetooth speakers often experience static electricity issues due to plugging and unplugging, which can affect their use，If the Bluetooth speaker does not readUSBcard、The sound of singing is noisy、Plug in and restart、Battery not supplying power、Noise, etc，According to the national requirements for static electricity and surge testing，Reasonable circuit design。

The following Lei Mao recommends various interface protection devices，Ensure reliability and safety，haveUSBinterface,TFCard interface，Audio and video interfaces andDCPower port/Battery port。The detailed scheme diagram can be found in the protection scheme of the mini program——Signal interface section view。

satisfyIEC61000-4-2，Level 4，Contact discharge 30kV，Air discharge 30kV；If it is necessary to meetIEC61000-4-5. High level surge testing requires high power selectionSMCdevice。

3.2TWSStatic protection scheme for wireless Bluetooth earphones

Due to the low working current of the earphones，Small size，Recommended to use Lei Mao SMD0603P010 model self recovery fuse，In the charging compartment, it can effectively protect against excessive current，The problem of overheating。

Anti static electricityESDRecommended use of devicesLC0542T5，Can effectively meet the requirementsVBUSandIOStatic electricity protection requirements。

satisfyIEC61000-4-2，Level 4，Contact discharge 14kV，Air discharge 17kV.

4.1radarmoduleLMXBR202010 Circuit Plan

Radar moduleLMXBR202010 Circuit Application Cases，This module can be applied to smart lighting、Intelligent Security 、Smart Home、Intelligent home appliancesOther fields。

Radar chip：XBR816

center frequency：9.85GHz

Supply voltage：1.2V

Maximum operating current：50mA

Voltage reducing deviceDCDC：LM6216A12M3G（Vout：1.2V）、LM6216A30M3G（Vout：3.3V）

Anti static protection devicesESD：ESDA05CT30（Vrwm：5V）

The module components are packaged in small packages，Save space。

satisfyIEC61000-4-2，Level 4，contact/Air discharge±30KV。

5.1LC03-6ForT1，T3/E3，10M/100M，High speed drive line，ISDN-S/UInterface line electrostatic surge protection scheme

Lei MaoLC03-The 6 series is applied to suppress static surges between two high-speed data lines，Can withstand up to 100 currentsAImpulse current。Can be used for differential mode protection or common mode protection，Can meetGR-1089 standard。

6.1LEDPower module and open circuit protection scheme for intelligent lighting

The use of Lei Mao devices includes：

Rectifier bridge：The characteristic of Leimao rectifier bridge is that the packaging size is the smallest in the industry，recommendationIBSEncapsulated rectifier bridge，IB-SSeries specialized forLEDmirror Mingjie；
Self recovery fusePTC；
Transient voltage suppressiondiodeTVS ：Effectively protecting precision in electronic circuitscomponent，Protected from damage caused by various surge pulses；
Electrostatic protection componentsESD ：The lighting industry mostly applies 5V、12V、24V、36VLuminaires，LEDRecommended small bodies that do not take up space for applications Integrated packaging，
LEDOpen circuit protection elementPLED：Dedicated toLEDLamp bead series circuit，When a certainLED Not affected when the lamp beads are damaged or open circuit is present Ring OtherLEDNormal operation of lamp beads；And it also has anti overvoltage protection performance，bringLED Can resist instantaneous lightning strikes。With conductivity Low voltage、have a swift response、Features such as self recovery after troubleshooting，Greatly improvedLED Stability of circuit operation。

7.1An anti-static solution for screen stuttering and dead screen on display screens

All kinds of screens have a baseband，There is a dot on the basebandICMaintain normal screen operation。Static electricity from the shell to the ground and fromPCBAAnywhere on the board can penetrate and affect the basebandIC Normal operation。IC The rated working voltage of is basically 3V，Relatively fast frequency。

Lei Mao is now showcasing several issues encountered by clients：

1. Home appliance display screen customers，Play 20KVAir static electricity，Frequent screen dead，Restarting is good again。Lei Mao Analysiscircuit boardfind，The customer has already used a lotESDcomponent，Re analyze the electrical properties of components，find，Incorrect voltage selection，The capacitance is also too high。Recommended by Lei MaoESDA3.3CW-4 SolutionESD

2. Workshop tablet control equipment，Previously, the customer chose a capacitor that was too highSD03C，For this reason, the customer has put in a lot of effort to load capacitor devices in the capacitor field，Still not ideal。Lei Mao recommends replacing it directlyLC03CI No need to modify the circuit board。If you want to modify the circuit board, your first choice isESDA3.3CW-4 Take care of one，Can replace 4 piecesLC03CI，Moreover, it saves the customer's 4 pillsSD03CAnd 4 capacitor devices。

3. Car driving recorder，Customer's shell installation，Electrostatic pulse，Lightning pulses can cause screen death。Because it's a car，Higher testing level，Can be addedESDA3.3CW-4 orLC03CIorSD03C，in additionEMCOverall, we also need to put in some effort，Leave this to meEMCThe rectification engineer discussed it。

8.1Gallium nitrideGaNStatic surge protection scheme

Antecedent：Gallium nitride does not have transient surge absorption capability，During circuit switching transients and lightning surges，Overflow voltage cannot exceed the rated capacity of gallium nitride。

Advantages of the plan：At the primary stage of the flyback power transformerTVSCan fully absorbFETOverimpulse energy generated by switching transients，Quick response、Low residual pressure、controlled.

Lei Mao adopts： PTVS160AFSingle device protection,High power，Small size，Save space.

9.1Smart Watch Activity tracker

Smart Watch，Activity tracker ，Also known as fitness tracking，This is a wearable device，Fitness related metrics used for monitoring and tracking devices or applications，Can be used for children's position monitoring，Walking distance or operating conditions，Calories burned and in some cases, heart rate, etc，Can determine the frequency and intensity of exercise, as well as the physical condition of the person。

Recommended Lei Mao products for smartwatches

10.1Earphone interface electrostatic protection scheme

Advantages of the plan：Left and right channels andMICSignal line amplifierESDDiode protection post stage chip，Lei Mao will add magnetic beads to filter out noise according to the situation，Can choose 3.3VOr 5V ESD diode，While ensuring signal integrity，adoptElectrostatic testing。 satisfy：IEC61000-4-2，Contact discharge 30kV，Air discharge 30kV，ISO10605-2 Level 4

10.2TWSStatic Protection Scheme for Wireless Bluetooth Earphone Interface

Advantages of the plan：Lei Mao's plan includesTWSA complete solution for two parts: Bluetooth earphones and charging compartment ，Affected bytwsheadsetSpace limitations and reasons for mobility and portability，TWS We offer a compact headphone protection solution，Low capacity，Low leakage current，High stability protective devices，We use high-power and small packaging for the power portESD,EOS Protective devices，High frequency signal lines use low junction capacitorsESDProtective devices。AllESDProtective devices IR <0.1uA。therefore，This plan is very suitableTWS Bluetooth earphones and other wearable products。

This scheme can ensure signal integrity while also，Through electrostatic testing。 satisfy：IEC61000-4-2，Contact discharge 30kV，Air discharge 30kV，ISO10605-2 Level 4。

1.TWS Bluetooth earphones ESD &EOS Protection plan

2.TWS Headphone charging compartment ESD&EOS Overall solution

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。

The fragile nerves guarding the electronic world：Revealing the Art of Static and Surge Protection fo From static electricity to surges，Comprehensive protection：Summary of protection design schemes for

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Lei Mao's one-stop solution to electrostatic surge and interface safety in electronic equipment

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