No ka noiʻi a me ka hoʻomohala ʻana i ka lako mana e hoʻololi ana, Hoʻolālā PCB occupies a very important position. A bad PCB has poor EMC performance, high output noise, weak anti-interference ability, and even basic functions are defective.

ʻOkoʻa iki mai PCBS lako paʻa, PCBS ka hoʻololi ʻana i kahi mana o kā lākou iho. E kamaʻilio pōkole kēia ʻatikala e pili ana i kekahi o nā kumu nui o ka hoʻopili PCB no ka hoʻololi ʻana i ka lako ma muli o ka ʻike ʻenehana.

1, spacing

Pono e noʻonoʻo ʻia ka laina laina no nā huahana uila kiʻekiʻe. ʻO ka spacing i hiki ke hoʻokō i nā koi o nā lula palekana e pili pono ana ʻoi aku ka maikaʻi loa, akā i nā manawa he nui no nā huahana i pono ʻole ka hōʻoia, a i ʻole hiki ke hoʻokō i ka palapala hōʻoia, hoʻoholo ʻia ka spacing e ka ʻike. He aha ka laulā o ke kau kūpono? Pono e noʻonoʻo i ka hana inā e hōʻoia i ka hoʻomaʻemaʻe o ka papa, ka mahana o ke kaiapuni, a ke kali nei kahi haumia no kahi kūlana pehea.

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. Nā mea ma ka lihi o ka papa

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.

FIG. 1 Comparison of stress on the device when the plate is split

Hiki ke ʻike ʻia ka mamao o ka hāmeʻa a kūlike i ka lihi o ka mahele, inā ʻaʻole e hōʻino ʻia ka mea ma muli o ka PCB splitter.

3. Loop area

Whether input or output, power loop or signal loop, should be as small as possible. Kuhi ka loop loop uila i ka māla electromagnetic, kahi e alakaʻi ai i nā ʻano EMI maikaʻi ʻole a i ʻole kani walaʻau nui; At the same time, if received by the control ring, it is likely to cause an exception.

Ma ka ʻaoʻao ʻē aʻe, inā ʻoi aku ka nui o ka mana loop loop, e hoʻonui pū ʻia ka inductance parasite like, kahi e hoʻonui ai i ka piko walaʻau o ke kahawai.

4. Kelepona kī

Ma muli o ka hopena o DI / DT, pono e hoʻemi ʻia ka inductance ma ka piko hōʻeuʻeu, a i ʻole e hana ʻia ka māla electromagnetic ikaika. Inā makemake ʻoe e hōʻemi i ka inductance, makemake nui e hōʻemi i ka lōʻihi o ka uea ʻana, hoʻonui i ka hana ākea ka liʻiliʻi.

5. Nā kaula hōʻailona

No ka ʻāpana holoʻokoʻa holoʻokoʻa, pono e noʻonoʻo ʻia i ka uapo ʻana mai ka ʻaoʻao mana. Inā pili kokoke lāua i kekahi ma muli o nā kapu ʻē aʻe, ʻaʻole like ka laina kaohi a me ka laina mana, a i ʻole ia e alakaʻi i ka hana maʻamau o ka mana, haʻalulu.

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. ANA. Hōʻike ʻo 2 i ka pololei a me ka pololei ʻole o nā laina laina laina ma waena o A a me B.

Kiʻi 2 ʻO nā pololei a me nā hana hewa hōʻailona hōʻailona pono ʻole.

ʻOiaʻiʻo, e hōʻemi ka laina hōʻailona i ka pili ma o nā puka!

6, copper

I kekahi manawa pono ʻole ke kau ʻana i ke keleawe a pono hoʻi e hōʻalo ʻia. Inā lawa ka keleawe a ʻano ʻokoʻa kona voltage, hana paha ia ma ke ʻano he antenna, e hoʻomālamalama ana nā nalu uila a puni iā ​​ia. Ma ka lima ʻē aʻe, maʻalahi ke kiʻi i ka walaʻau.

ʻO ka maʻamau, ʻae wale ʻia ke kau keleawe ma nā piko static, e like me ka piko “ground” i ka hopena puka, kahi e hiki ai ke hoʻonui pono i ka capacitance puka a kānana i kekahi mau hōʻailona walaʻau.

7, palapala ‘āina,

For a circuit, copper can be laid on one side of the PCB, which automatically maps to the wiring on the other side of the PCB to minimize the impedance of the circuit. Me he mea lā e hoʻopili ʻia kahi hoʻonohonoho o nā impediment me nā waiwai impedance ʻokoʻa i ka like, a e koho koho ʻia ke au i ke ala me ka impedance haʻahaʻa e kahe ai.

Hiki iā ʻoe ke uea maoli i ka ʻāpana o ka pōʻaiapuni ma kekahi ʻaoʻao, a moe keleawe ma ka piko “honua” ma kekahi ʻaoʻao, a hoʻohui i nā ʻaoʻao ʻelua ma o ka lua.

8. Diode rectifier auao

Inā kokoke ka diode rectifier puka i ka hopena, ʻaʻole pono e kau like me ka hopena. Inā ʻole, e komo ka māla electromagnetic ma ka diode i loko o ka loop i hana ʻia e ka hopena mana a me ka ukana kūwaho, no laila e hoʻonui ka leo i nā leo puka.

ANA. 3 Pololei a pololei ʻole ka hoʻokomo ʻana i nā diode

9, uea lepo,

Pono e akahele nā ​​kaula o nā kaula honua. Inā ʻole, e hōʻino paha ka EMS, EMI a me nā hana ʻē aʻe. No ka hoʻololi ʻana i ka mana lako PCB “honua”, ma ka liʻiliʻi he ʻelua mau helu ma lalo: (1) ka papa honua a me ka pae hōʻailona, ​​pono e pili hoʻokahi kiko; (2) ʻAʻole pono he loop loop.

10. Y capacitance

Hoʻokomo pinepine ʻia ka hoʻokomo a me ka puka i ka capacitor Y, i kekahi manawa no kekahi mau kumu, ʻaʻole hiki ke kau ʻia ma ka honua capacitor input, e hoʻomanaʻo i kēia manawa, pono e hoʻopili ʻia i kahi node static, e like me ka terminal voltage kiʻekiʻe.

11, ʻē aʻe

Ke hoʻolālā nei i ka PCB o ka lako mana maoli, aia paha kekahi mau pilikia ʻē aʻe e noʻonoʻo ai, e like me “kokoke ka varistor i ke kaapuni pale”, “induction mode mode to increase the hoʻokuʻu niho”, “chip VCC power supply should e hoʻonui i ka capacitor ”a pēlā aku. Eia kekahi, ʻo ka pono no ka lapaʻau kūikawā, e like me ka pepa keleawe, pale, a pēlā aku, pono nō hoʻi e noʻonoʻo ʻia i ka hanana hoʻolālā PCB.

I kekahi manawa hālāwai pinepine kekahi mau loina i ka hakakā me kekahi, e hālāwai me kekahi o lākou hiki ʻole ke hui i kekahi, ʻo kēia ka pono o nā ʻenekini e noi i nā ʻike e kū nei, e like me nā pono o ka papahana maoli, e hoʻoholo i nā uea kūpono loa.