Oghere na -arịgo n’ime PCB is an important element in electronic design. Onye nrụpụta PCB ọ bụla ga -aghọta ebumnuche nke oghere PCB na nhazi ya. Ọzọkwa, mgbe ejikọtara oghere arịgoro na ala, enwere ike ịchekwa ụfọdụ nsogbu na -enweghị isi mgbe echichichara.

Etu esi eji oghere PCB belata EMI?

Dị ka aha ahụ na -egosi, oghere itinye PCB na -enyere aka idobe PCB n’ụlọ. Agbanyeghị, nke a bụ ihe eji arụ ọrụ anụ ahụ, na mgbakwunye na ọrụ electromagnetic, enwere ike iji oghere itinye PCB iji belata nnyonye anya elektrọnik (EMI). A na-etinyekarị PCBS nke nwere mmetụta Emi na ogige ọla. Iji belata EMI nke ọma, ekwesịrị ijikọ oghere PCB plated na ala. Mgbe ihe mkpuchi ala a gasịrị, ndabichi ọ bụla ga -esi na mkpochi ọla ruo na ala.

Etu esi eji oghere PCB belata EMI? Gịnị mere njikọ ala ji dị mkpa?

Ajụjụ a na -ajụkarị nke onye nrụpụta ọhụrụ bụ ala nke ị jikọtara ya na ya? N’ime ngwaọrụ elektrọnik nkịtị, enwere akara, ntọala ụlọ na ntọala. Dị ka usoro isi aka, ejikọla oghere ndị na -arị elu iji gosi ala. Ala mgbaama bụ ala nrụtụ aka maka ngwa elektrọnik na nhazi sekit gị, na iwebata nnyonye anya elektrọnik n’ime ya abụghị ezigbo echiche.

Ihe ị chọrọ ijikọ bụ ikpe ala. Nke a bụ ebe njikọ niile dị na kabinet na -ezukọ. Ekwesịrị ijikọ ntọala chassis n’otu oge, ọkacha mma site na njikọ kpakpando. Nke a na -ezere ịkpata loops ntọala na ọtụtụ njikọ ala. Multiple grounding connections can cause a slight voltage difference and cause current to flow between chassis grounding. A na -agbada chassis ahụ n’ala maka usoro nchekwa.

Gịnị kpatara o ji dị mkpa inwe njikọ ntọala kwesịrị ekwesị?

Ọ bụrụ na ntọala okpokoro nke bọọdụ PCB bụ shei ọla, mgbe ahụ ihe mkpuchi ọla niile bụ ụwa. A na -ejikọ waya ala nke ọkụ eletrik 220V na ụwa. Ekwesịrị ijikọ ihu niile na ụwa, yana kposara kwesịrị ijikọ na ụwa. In this way, incoming interference in EMC testing is discharged directly from the ground to the ground without interfering with the internal system. Na mgbakwunye, ngwaọrụ nchedo EMC ga -enwerịrị interface nke ọ bụla, ma kwesịrị ịdị nso na interface ahụ.

If it’s a plastic case, it’s best to have a metal plate embedded in it. Ọ bụrụ na ọ nweghị ụzọ ị ga -esi nweta, mgbe ahụ ọ dị mkpa ịtụle ihe ndị ọzọ na okirikiri wiring, akara mmetụta ọsọ ọsọ (elekere, nrụgharị, kristal oscillator, wdg) chọrọ iji chekwaa nhazi ala, mụbaa netwọkụ nzacha (mgbawa, oscillator kristal). , Ịnye ọkụ).

Ijikọ oghere ịkwakọba na ala chassis bụ omume kacha mma, mana ọ bụghị naanị omume kacha mma ịgbaso. Iji hụ na echekwara ngwaọrụ gị, a ga -ejikọrịrị ntọala chassis gị na ọdụ ụgbọ ala kwesịrị ekwesị. Dịka ọmụmaatụ, ọ bụrụ na ị rụọ igwe na -akwụ ụgwọ akpaaka akpaghị aka nke ọma, ị nwere ike nwee ndị ahịa na -eme mkpesa maka “ujo eletriki” mgbe ị na -akwụ ụgwọ. Nke a nwere ike ime mgbe onye ahịa na-emetụ akụkụ igwe anaghị egbochi ya.

Ọkụ eletrik dị nwayọọ nwekwara ike ime mgbe chassis ike kọmpụta adabaghị nke ọma. This can also happen when ground cables connecting power outlets to the floor of a building are disconnected. Nke a nwere ike ibute ịdọrọ n’elu igwe dabara.

The principle of EMI shielding depends on proper grounding connections. Inwe njikọ ala na -ese n’elu mmiri abụghị naanị na -ekpughere onye ahịa gị obere ujo eletrik, mana ọ nwere ike imebi nchekwa onye ahịa gị ma ọ bụrụ na ngwaọrụ gị dị mkpụmkpụ. Dị ka egosiri na ọnụ ọgụgụ dị n’okpuru, ezigbo ntọala dị mkpa maka nchekwa na mkpuchi EMI.

Usoro izizi maka ịchebe oghere PCB

A na -ejikarị oghere itinye PCB na imewe. Enwere iwu ole na ole dị mfe ma a bịa n’ịwụnye oghere. Nke mbụ, attentionaa ntị na nhazi nke oghere na -arịgo. Mperi ebe a ga -ebute ozugbo PCB arụnyere nke ọma n’ụlọ ya. Hụkwa na oghere arịgoro bụ nha kwesịrị ekwesị maka ịghasa ị họọrọ.

Nnukwu sọftụwia sekit, dị ka ngwanrọ usoro Altium Designer, nwere ike idobe oghere oghere yana kọwaa iwu ndị metụtara oghere dị nchebe. Etinyekwala oghere arịgoro oke na nsọtụ PCB. Obere ihe ọkụ ọkụ dị n’akụkụ ya nwere ike bute mgbawa na PCB n’oge nrụnye ma ọ bụ mwepụ. Ịkwesịrị ịhapụ ohere zuru oke n’etiti oghere na -arịgo na akụkụ ndị ọzọ.