Maka nyocha na mmepe nke ịgbanye ọkụ ọkụ, PCB imewe nwere nnukwu ọnọdụ. A bad PCB has poor EMC performance, high output noise, weak anti-interference ability, and even basic functions are defective.

Ọ dịtụ iche na PCBS ngwaike ndị ọzọ, ike PCBS nwere ikike nwere ụfọdụ njirimara nke ha. Isiokwu a ga -ekwu okwu mkpirikpi banyere ụfọdụ ụkpụrụ kachasị nke eriri PCB maka ịgbanye ọkụ ọkụ dabere na ahụmịhe injinịa.

1, ịgbasa

A ghaghị ịtụle oghere dị n’ahịrị maka ngwaahịa ọkụ eletrik dị elu. Oghere nke nwere ike iru ihe achọrọ na ụkpụrụ nchekwa kwekọrọ bụ nke kacha mma, mana ọtụtụ oge maka ngwaahịa na -adịghị mkpa asambodo, ma ọ bụ enweghị ike iru asambodo ahụ, ahụmịhe na -ekpebi oghere ahụ. Kedu obosara nke oghere kwesịrị ekwesị? Ekwesịrị ịtụle mmepụta ma ọ ga -ekwe nkwa ịdị ọcha elu, iru mmiri gburugburu ebe obibi, mmetọ ndị ọzọ na -eche ka ọ dị.

Maka ntinye isi, ọbụlagodi na enwere ike ijide n’aka na bọọdụ ahụ dị ọcha ma kaa akara, MOS tube drain electrode dị nso na 600V, ihe na -erughị 1mm dị ize ndụ n’ezie!

2. Ngwa dị na nsọtụ bọọdụ

Maka patch capacitance ma ọ bụ ngwaọrụ ndị ọzọ mebiri emebi na nsọtụ PCB, ekwesịrị iburu n’uche ụzọ PCB splitter mgbe ị na -etinye. Ọnụ ọgụgụ ahụ na -egosi ntụnyere nrụgide na ngwaọrụ n’okpuru ụzọ ntinye dị iche iche.

FIG. 1 Atụnyere nrụgide na ngwaọrụ mgbe efere kewara

Enwere ike ịhụ na ngwaọrụ ahụ kwesịrị ịpụ na ya na nsọtụ nke onye na -ekewa, ma ọ bụghị ya, akụrụngwa nwere ike mebie n’ihi PCB splitter.

3. Mpaghara akaghị

Whether input or output, power loop or signal loop, should be as small as possible. Oghere ike na -ewepụta mpaghara elektrọnik, nke ga -eduga na njirimara EMI dara ogbenye ma ọ bụ mkpọtụ mmepụta dị ukwuu; At the same time, if received by the control ring, it is likely to cause an exception.

N’aka nke ọzọ, ọ bụrụ na mpaghara mgbachi ike dị ukwuu, nha anya parasitic inductance ga -abawanye, nke nwere ike ịbawanye elu mkpọtụ mmiri igbapu mmiri.

4. Wiring isi

N’ihi mmetụta nke DI/DT, a ga -ebelata inductance na ọnụ ike, ma ọ bụghị ya, a ga -ewepụta ọkụ eletrik siri ike. Ọ bụrụ n’ịchọrọ ibelata inductance, na -achọkarị ibelata ogologo nke wiring, ịbawanye arụmọrụ obosara dị obere.

5. eriri mgbaàmà

Maka ngalaba nchịkwa niile, ekwesịrị ka echebara wiwi pụọ na ngalaba ike. Ọ bụrụ na ha abụọ nọ ibe ha nso n’ihi mmachi ndị ọzọ, ahịrị njikwa na akara ike ekwesịghị ịdị ka ibe ya, ma ọ bụghị ya, ọ nwere ike ibute arụ ọrụ na -adịghị mma nke ike ọkụ, ujo.

In addition, if the control line is very long, a pair of back and forth lines should be close to each other, or the two lines should be placed on the two sides of the PCB facing each other, so as to reduce the loop area and avoid interference by the electromagnetic field of the power part. FIG. 2 na -egosi ụzọ mgbazinye akara akara ziri ezi na nke na -ezighi ezi n’etiti A na B.

Ọgụgụ 2 Ụzọ mgbazinye eriri mgbaama ziri ezi na nke na -ezighi ezi.

N’ezie, ahịrị mgbama kwesịrị ibelata njikọ ahụ site na oghere!

6, ọla kọpa

Mgbe ụfọdụ ịtụkwasị ọla anaghị adịcha mkpa, ekwesịrị ịze ya. Ọ bụrụ na ọla kọpa buru oke ibu ma na voltaji ya dịgasị iche, ọ nwere ike rụọ ọrụ dị ka antenna, na -eme ka ebili mmiri eletrik gbaa ya gburugburu. N’aka nke ọzọ, ọ dị mfe ibuli mkpọtụ.

Na mkpokọta, a na -anabata idobe ọla kọpa na ọnụ ọnụ, dị ka oghere “ala” na njedebe mmepụta, nke nwere ike ịbawanye ikike mmepụta ya nke ọma wee hichapụ ụfọdụ mkpọtụ mkpọtụ.

7, eserese,

Maka sekit, enwere ike idobe ọla kọpa n’otu akụkụ nke PCB, nke na -esepụta akpaaka na wiring n’akụkụ nke ọzọ nke PCB iji belata impedance nke sekit ahụ. Ọ dị ka a ga -asị na ejikọtara otu ihe mgbochi nwere ụkpụrụ impedance dị iche iche na nke ugbu a, na nke ugbu a ga -ahọrọ ụzọ nwere obere ihe nfe ga -agafe.

Ị nwere ike waya akụkụ njikwa sekit n’otu akụkụ, wee debe ọla kọpa n’akụkụ “ala” n’akụkụ nke ọzọ, wee jikọọ akụkụ abụọ ahụ site na oghere.

8. diode mmepụta ihe

Ọ bụrụ na diode nrụpụta nrụpụta dị nso na mmepụta ya, ekwesighi idobe ya na mmepụta ya. Ma ọ bụghị ya, mpaghara elektrọnik nke emepụtara na diode ga -abanye n’ime loop nke nrụpụta ike na ibu dị na mpụga pụtara, ka ụda nrụpụta a tụrụ atụ na -abawanye.

FIG. 3 Ndozi ziri ezi na ezighi ezi nke diodes

9, waya ala,

Wiring nke eriri ala ga -akpachapụ anya. Ma ọ bụghị ya, EMS, EMI na arụmọrụ ndị ọzọ nwere ike ịka njọ. Maka ịgbanye ọkụ eletrik PCB “ala”, opekata mpe isi ihe abụọ a: (1) ala ike na ala mgbaama, kwesịrị ịbụ njikọ otu ebe; (2) E kwesịghị inwe mkpọchi ala.

10. Y capacitance

A na -ejikọkarị ntinye na mmepụta ya na capacitor Y, mgbe ụfọdụ n’ihi ihe ụfọdụ, ọ nwere ike ọ gaghị enwe ike kwụgide na ala capacitor ntinye, cheta n’oge a, ga -ejikọrịrị ya na ọnụ ọnụ static, dị ka ọdụ ụgbọ elu dị elu.

11, ndị ọzọ

Mgbe ị na -echepụta PCB nke ezigbo ọkụ ọkụ, enwere ike ịnwe nsogbu ndị ọzọ ị ga -echebara echiche, dị ka “varistor kwesịrị ịdị nso na sekit echedoro”, “ntinye ọnọdụ nkịtị iji bulie ezé ndị na -agbapụta”, “mgbawa ike VCC kwesịrị. mụbaa capacitor ”na ihe ndị ọzọ. Na mgbakwunye, ekwesịrị ịtụle mkpa maka ọgwụgwọ pụrụ iche, dị ka foil ọla, mkpuchi, wdg, na ọkwa imebe PCB.

Mgbe ụfọdụ, na -ezute ọtụtụ ụkpụrụ na -emegide ibe ha, izute otu n’ime ha enweghị ike izute nke ọzọ, nke a bụ mkpa ndị injinia itinye ahụmịhe dị adị, dị ka mkpa ọrụ dị n’ezie, chọpụta eriri kacha dabara adaba!