Okocwaningo nentuthuko yokushintshwa kokuphakelwa kwamandla, Design PCB ithatha isikhundla esibaluleke kakhulu. A bad PCB has poor EMC performance, high output noise, weak anti-interference ability, and even basic functions are defective.

Ihluke kakhulu kwamanye ama-PCBS wehadiwe, ukushintsha amandla kwe-PCBS kunezici ezithile zazo. Lo mbhalo uzokhuluma kafishane ngeminye yemigomo eyisisekelo ye-wiring ye-PCB yokushintsha ukunikezwa kwamandla kususelwa kulwazi lobunjiniyela.

1, isikhala

Isikhala somugqa kufanele sicatshangelwe ngemikhiqizo yamandla aphezulu. Isikhala esingahlangabezana nezimfuneko zemithethonqubo yokuphepha ehambisanayo yiyona engcono kakhulu, kepha izikhathi eziningi zemikhiqizo engadingi isitifiketi, noma engakwazi ukuhlangabezana nesitifiketi, isikhala sinqunywa ngokuhlangenwe nakho. Yibuphi ububanzi besikhala obufanele? Kufanele ucabangele ukukhiqizwa ukuthi uqinisekise ukuhlanzeka kwebhodi phezulu, umswakama wezemvelo, okunye ukungcola okulinda isimo kanjani.

For the mains input, even if the board surface can be guaranteed clean and sealed, MOS tube drain source electrode close to 600V, less than 1mm is actually more dangerous!

2. Izingxenye emaphethelweni ebhodi

For the patch capacitance or other easily damaged devices at the edge of PCB, the PCB splitter direction must be taken into consideration when placing. The figure shows the comparison of the stress on the devices under various placement methods.

ISITHOMBE. 1 Ukuqhathanisa ukucindezeleka kudivayisi lapho ipuleti lihlukaniswa

Kungabonakala ukuthi idivayisi kufanele ibe kude futhi ifane emaphethelweni esihlukanisi, ngaphandle kwalokho ingxenye ingalimala ngenxa yokuhlukaniswa kwe-PCB.

3. Loop area

Whether input or output, power loop or signal loop, should be as small as possible. Iluphu yamandla ikhipha inkambu kagesi, ezoholela kuzimpawu ezimbi ze-EMI noma umsindo omkhulu wokukhipha; At the same time, if received by the control ring, it is likely to cause an exception.

Ngakolunye uhlangothi, uma indawo yeluphu yamandla inkulu, ukwehliswa okulingana nezinambuzane nakho kuzokwenyuka, okungakhuphula inani eliphakeme lomsindo.

4. Izintambo zokhiye

Ngenxa yomphumela we-DI / DT, ukwehliswa kwe-node okunamandla kufanele kwehliswe, ngaphandle kwalokho kuzokwenziwa inkambu enamandla kagesi. Uma ufuna ukunciphisa i-inductance, ngokuyisisekelo ufuna ukunciphisa ubude bezintambo, ukwandisa isenzo sobubanzi sincane.

5. Izintambo zezimpawu

Esigabeni sonke sokulawula, kufanele kubhekwe ukuxhunywa kwentambo kude nesigaba samandla. Uma laba ababili besondelene ngenxa yeminye imikhawulo, intambo yokulawula nentambo yamandla akufanele ihambisane, ngaphandle kwalokho kungaholela ekusebenzeni okungajwayelekile kwamandla kagesi, ukushaqeka.

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. ISITHOMBE. 2 ikhombisa izindlela ezifanele nezingalungile zomzila womugqa wesiginali phakathi kuka-A no-B.

Umdwebo 2 Izindlela zokuqondisa ikhebula elungile nelingalungile.

Vele, ulayini wesiginali kufanele unciphise ukuxhumana ngezimbobo!

6, ithusi

Kwesinye isikhathi ukubeka ithusi akudingeki nhlobo futhi kufanele kugwenywe. Uma ithusi lalilikhulu ngokwanele futhi amandla alo ehlukahluka, lalingasebenza njenge-antenna, likhanye amagagasi kagesi azungeze lona. Ngakolunye uhlangothi, kulula ukucosha umsindo.

Ngokuvamile, ukubekwa kwethusi kuvunyelwe kuphela kuma-static node, njenge-node “yomhlabathi” ekugcineni kokukhipha, okungakhuphula ngempumelelo amandla wokukhipha futhi kuhlunge ezinye izimpawu zomsindo.

7, ukwenza imephu,

Okwesifunda, ithusi lingabekwa ohlangothini olulodwa lwe-PCB, oluzibeka ngokuzenzakalela ku-wiring ngakolunye uhlangothi lwe-PCB ukunciphisa impedance yesifunda. Kunjengokungathi iqoqo lezithiyo ezinamanani e-impedance ahlukile lixhunywe ngokufana, futhi i-current izokhetha ngokuzenzakalela indlela ene-impedance ephansi kakhulu engadlula kuyo.

Empeleni ungafaka ucingo ingxenye yokulawula yesekethe ngakolunye uhlangothi, bese ubeka ithusi kunodi “yomhlabathi” ngakolunye uhlangothi, bese uxhuma izinhlangothi zombili ngembobo.

8.I-diode yokulungisa okukhiphayo

Uma i-diode rectifier diode isondele kokukhiphayo, akufanele ibekwe ngokufana nokukhiphayo. Ngaphandle kwalokho, inkambu ye-electromagnetic eyenziwe ku-diode izongena ku-loop eyakhiwe ngamandla kagesi kanye nomthwalo wangaphandle, ukuze umsindo olinganisiwe wokukhipha ukhuphuke.

ISITHOMBE. 3 Ukubekwa ngendlela efanele nokungalungile kwama-diode

9, phansi ucingo,

Ukuxhunywa kwezintambo zomhlabathi kufanele kuqaphele kakhulu. Ngaphandle kwalokho, i-EMS, i-EMI nokunye ukusebenza kungahle kwehle. Ngokushintshela i-PCB “umhlabathi” wokunikezwa kwamandla, okungenani amaphuzu amabili alandelayo: (1) amandla kagesi nomhlabathi wesiginali, kufanele kube ukuxhumeka kwephoyinti elilodwa; (2) Akufanele kube khona iluphu yomhlabathi.

10. Y amandla

Okokufaka nokukhiphayo kuvame ukuxhumeka ku-Y capacitor, kwesinye isikhathi ngenxa yezizathu ezithile, kungahle kungakwazi ukulenga endaweni yokufaka ye-capacitor, khumbula ngalesi sikhathi, kufanele kuxhunywe ku-node emile, njenge-high voltage terminal.

11, okunye

Lapho kuklanywa i-PCB yokunikezwa kwamandla uqobo, kungahle kube nezinye izingqinamba okufanele uzicabangele, njenge “i-varistor kufanele ibe seduze kwesekethe evikelwe”, khulisa i-capacitor ”njalo njalo. Ngaphezu kwalokho, isidingo sokwelashwa okukhethekile, okufana nocwecwe lwethusi, ukuvikelwa, njll., Kufanele kubhekwe nasezingeni le-PCB design.

Kwesinye isikhathi kwesinye isikhathi kuhlangana izimiso eziningi ezingqubuzanayo, ukuhlangabezana nesinye sazo ngeke kuhlangatshezwane nesinye, lesi yisidingo sonjiniyela ukusebenzisa isipiliyoni esivele sikhona, ngokusho kwezidingo zephrojekthi yangempela, ukunquma izintambo ezifanele kakhulu!