智能門鎖是指在傳統機械鎖的基礎上改進，將電子技術、集成電路、電子元器件等結合多種識別技術的產品。近幾年來，智能門鎖逐漸成為消費者首選，不僅有著更高的安全防護性能，而且使用起來也十分方便。智能門鎖支持多種解鎖方式，包括指紋解鎖、鑰匙解鎖、NFC卡片解鎖、臨時密碼解鎖、手機/手表解鎖、AI3D 人臉解鎖等。隨著智能門鎖市場快速發展和產品可靠性提升的需求，相關的檢測規范也應運而生，其中包含靜電放電標準IEC61000-4-2和浪涌沖擊標準 IEC61000-4-5。東沃電子DOWOSEMI擁有全套先進的測試設備與專業的測試整改團隊，可根據相關的測試標準，提供智能門鎖ESD/EOS及浪涌防護整體解決方案。

智能門鎖(suo)浪涌靜電保護方案設計圖

       如圖所示(shi)，智(zhi)能(neng)門鎖控制(zhi)板由鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)+干(gan)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)組合供電(dian)(dian)(dian)(dian)(dian)(dian)、毫(hao)米波雷達傳感器系統喚醒(xing)、藍(lan)牙芯片(pian)、電(dian)(dian)(dian)(dian)(dian)(dian)源管理 IC、3D 人臉識(shi)別、指紋(wen)識(shi)別、傳感器、按鍵、LCD 顯示(shi)屏、馬達驅動(dong)等組成。智(zhi)能(neng)門鎖控制(zhi)板供電(dian)(dian)(dian)(dian)(dian)(dian)分為鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)和干(gan)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)兩部分，優先使用(yong)鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)供電(dian)(dian)(dian)(dian)(dian)(dian)，鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)沒電(dian)(dian)(dian)(dian)(dian)(dian)后干(gan)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)才會進行(xing)供電(dian)(dian)(dian)(dian)(dian)(dian)，鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)就可(ke)以拿出來(lai)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)，鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)也不(bu)會停機，從而實(shi)現循環供電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)刻在(zai)線的效果。即便是鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)干(gan)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)都(dou)沒電(dian)(dian)(dian)(dian)(dian)(dian)，還可(ke)以用(yong)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)寶或USB Type-C數據線給門鎖充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)，實(shi)現應急解鎖。

       在實際使用中，由于(yu)靜(jing)(jing)電(dian)(dian)(dian)ESD和浪(lang)涌(yong)的存在，會導致智能門(men)(men)鎖(suo)出(chu)現(xian)故障，甚至對(dui)智能門(men)(men)鎖(suo)系統產(chan)生不可逆(ni)的破壞性。針對(dui)智能門(men)(men)鎖(suo)靜(jing)(jing)電(dian)(dian)(dian)浪(lang)涌(yong)問題，東(dong)沃電(dian)(dian)(dian)子可提供(gong)高緊湊度、大功率、低(di)鉗位電(dian)(dian)(dian)壓、低(di)漏電(dian)(dian)(dian)、超(chao)高穩定性的全系列ESD靜(jing)(jing)電(dian)(dian)(dian)防(fang)護器(qi)件，客戶可根據不同接口的靜(jing)(jing)電(dian)(dian)(dian)等(deng)級選擇合(he)適(shi)的產(chan)品。

智(zhi)能(neng)門(men)鎖浪(lang)涌靜(jing)電(dian)防(fang)護器件(jian)TVS/ESD選(xuan)型攻(gong)略

1）Type-C（USB）電源供電口(kou)ESD防(fang)護(hu)器件選型(xing)

       智能門鎖通過Type-C（USB）接口供電（充電），根據充電電流大小可選擇5V或12V的ESD靜電保護二極管。5V電源供電口推薦東沃SD05C或DW05DP-S，SD05C最大IPP=30A(8/20us)，功率450W，采用SOD-323封裝；DW05DP-S最大IPP=100A(8/20us)，功率2000W，采用DFN1006-2L小尺寸封裝。12V推薦東沃SD12C或DW12P4N3-S，SD12C最大IPP=18A(8/20us)，功率400W，采用SOD-323封裝；DW12P4N3-S最大IPP=150A(8/20us)，功率4000W，采用DFN2020-3L封裝，可滿足大功率充電需求。

2）Type-C（USB）數據口，高速I/O接口ESD防護器件選型

       智能(neng)門鎖(suo)高速(su)數據(ju)(ju)或I/O傳(chuan)輸(shu)時，對結電容(rong)要(yao)求(qiu)比較高，通常要(yao)求(qiu)選(xuan)擇Cj<0.5pF的ESD防護器(qi)件。東沃電子技術推薦選(xuan)型DW05DRF-B-E或DW05DGCMS-BH-E。東沃DW05DRF-B-E最(zui)大(da)IPP=4A(8/20us)，功率(lv)80W，結電容(rong)0.3pF，采用(yong)(yong)DFN1006-2L封裝；東沃DW05DGCMS-BH-E最(zui)大(da)IPP=3A(8/20us)，功率(lv)75W，結電容(rong)0.15pF，采用(yong)(yong)DFN0603-2L封裝，適合更(geng)高數據(ju)(ju)傳(chuan)輸(shu)速(su)率(lv)，。

3）VBAT電池接口ESD防護器件選型(xing)

       智(zhi)能門鎖(suo)鋰電(dian)池(chi)電(dian)壓一般為4.2~4.5V，超過可能充鼓(gu)電(dian)池(chi)。針對4.2~4.5V電(dian)池(chi)端ESD防護，東(dong)(dong)沃(wo)電(dian)子(zi)技術(shu)(shu)推薦(jian)選型(xing)4.5V的ESD二極管(guan)：DW4.5DPF-B-S、DW4.5D3HP-S、DW4.5DPVL-S、DW4.5P4N3-B-S等，功(gong)(gong)率(lv)大(da)(da)小根(gen)據(ju)實(shi)際需(xu)求選擇。東(dong)(dong)沃(wo)DW4.5DPF-B-S最(zui)大(da)(da)IPP=30A(8/20us)，功(gong)(gong)率(lv)450W，采(cai)(cai)用(yong)(yong)(yong)DFN1006-2L封(feng)(feng)裝；東(dong)(dong)沃(wo)DW4.5D3HP-S最(zui)大(da)(da)IPP=100A(8/20us)，功(gong)(gong)率(lv)1500W，采(cai)(cai)用(yong)(yong)(yong)SOD-323F封(feng)(feng)裝；東(dong)(dong)沃(wo)DW4.5DPVL-S最(zui)大(da)(da)IPP=180A(8/20us)，功(gong)(gong)率(lv)2160W，采(cai)(cai)用(yong)(yong)(yong)DFN1610-2L封(feng)(feng)裝；東(dong)(dong)沃(wo)DW4.5P4N3-B-S最(zui)大(da)(da)IPP=250A(8/20us)，功(gong)(gong)率(lv)4000W，采(cai)(cai)用(yong)(yong)(yong)DFN2020-3L封(feng)(feng)裝。5V電(dian)池(chi)接口防護，東(dong)(dong)沃(wo)電(dian)子(zi)技術(shu)(shu)推薦(jian)選用(yong)(yong)(yong)DWGB0511D2、DWGB0510D2等。東(dong)(dong)沃(wo)DWGB0511D2最(zui)大(da)(da)IPP=100A(8/20us)，功(gong)(gong)率(lv)900W，采(cai)(cai)用(yong)(yong)(yong)DFN1006-2L封(feng)(feng)裝。東(dong)(dong)沃(wo)DWGB0510D2最(zui)大(da)(da)IPP=50A(8/20us)，功(gong)(gong)率(lv)600W，采(cai)(cai)用(yong)(yong)(yong)DFN1006-2L封(feng)(feng)裝。

4）按鍵、觸摸、LED接口ESD防護器件選型

       智能門鎖鍵盤、觸(chu)摸輸入和(he)LED信(xin)號等接口(kou)靜電(dian)防護，東沃電(dian)子技術推薦選用結(jie)電(dian)容小于20pF的ESD二(er)極管。3.3V信(xin)號推薦DW03DMS-B-E、DW3.3DF-B-E、DWUB3312D2、DWUB3310D1等，結(jie)電(dian)容分(fen)別(bie)為20pF、15pF、15pF、15pF，封裝(zhuang)分(fen)別(bie)為DFN0603-2L、DFN1006-2L、DFN1006-2L、DFN0603-2L。5V信(xin)號推薦DW05D5BC-B-E、DW05DF-BH-E、DW05DMS-BH-E、DWUB0510D2等，結(jie)電(dian)容分(fen)別(bie)為11pF、14pF、20pF、15pF，封裝(zhuang)分(fen)別(bie)為SOD-523、DFN1006-2L、DFN0603-2L、 DFN1006-2L。

5）LCD接口(kou)ESD防(fang)護器件選型(xing)

       智能門鎖LCD信號(hao)接口(kou)ESD靜(jing)電防(fang)護，結電容大小要求0.5pF左右，東沃電子技術推薦選(xuan)型DW05DUCF-B-E、DW05DRF-B-E、DWMB0515D2、DWMB0516D2，工作電壓均為(wei)5V，結電容分(fen)別(bie)(bie)為(wei)0.5pF、0.3pF、0.3pF、0.3pF，封裝(zhuang)均為(wei)DFN1006-2L。電源部分(fen)東沃電子技術推薦選(xuan)型DW07D5-B-E、DW18D-B-S，工作電壓分(fen)別(bie)(bie)為(wei)7V、18V，封裝(zhuang)分(fen)別(bie)(bie)為(wei)SOD-523、SOD-323。

6）傳(chuan)感器接口ESD防護器件選型

       智能門鎖傳感器供電接口(kou)防護，東沃技術(shu)推(tui)薦(jian)選(xuan)型SD05C，數據(ju)傳輸接口(kou)防護選(xuan)用DW3.3DF-B-E，參數見(jian)上文(wen)。

7）音頻輸出接(jie)口ESD防護器件(jian)選型

&nbsp;      智(zhi)能(neng)門鎖(suo)音(yin)頻輸出接(jie)口(kou)防(fang)護，東沃技術推薦選型DW05DRF-B-E，參數見上文。

8）RF射頻接口(kou)ESD防(fang)護器件選型

       智(zhi)能門鎖無線射(she)頻（WIFI/藍牙/NFC等）接口ESD靜電保護，由(you)于(yu)信號(hao)頻率較高，需(xu)要(yao)采用(yong)超低結(jie)電容的ESD二極管，東(dong)沃技術推薦(jian)選型(xing)DWPMB0511D2，最大(da)IPP=3A(8/20us)，功(gong)率60W，結(jie)電容0.18pF，采用(yong)DFN1006-2L封裝(zhuang)，確保信號(hao)的完整性。

9）UART接口(kou)ESD防護(hu)器件(jian)選型

       指紋模塊(kuai)、人臉識別模塊(kuai)、無線(xian)模塊(kuai)等與主(zhu)機采(cai)用UART方式連接，UART接口防ESD靜電保護，東沃技術(shu)推薦(jian)選型(xing)DW03DLC-B-S或DW05DLC-B-S，工作電壓(ya)分別為3.3V和5V，結電容均為1pF，功(gong)率均為350W，均采(cai)用SOD-323封裝。

10）馬達(da)驅(qu)動浪涌防(fang)護器件TVS二極(ji)管選(xuan)型

       馬達驅動電路由于感性負載存在的原因容易產生浪涌尖峰，如果不加以保護很容易損壞驅動芯片，甚至影響系統的工作，為此需要選用浪涌抑制器件TVS二極管加以防護，東沃技術推薦選用SM4L17A、SMAJ15CA，功率均為400W，東沃SM4L17A在10/1000us測試條件下IPP=14.5A，采用SOD-123封裝；東沃SMAJ15CA在10/1000us測試條件下IPP=16.39A,采用SMA/DO-214AC封裝。

       以上是東沃智能門鎖浪涌靜電保護方案，如有特殊需求，歡迎前來探討。浪涌靜電防護方案，找東沃電子，電路保護不迷路！方案中選型用到的ESD靜電保護二極管和TVS二極管，東沃電子已全面量產、品質穩定、高可靠性、交期迅速、廠家價格、免費樣品、免費EMC測試、免費選型，歡迎廣大新老客戶前來咨詢：137 5773 6996（微信同號）余工。