Macapacitor anoita basa rakakosha mukumhanya-mhanya PCB dhizaini uye kazhinji ndiyo inonyanya kushandiswa mudziyo paPCBS. MuPCB, macapacitors anowanzo kukamurwa kuita mafirita capacitors, decoupling capacitors, simba rekuchengetedza capacitors, nezvimwe.

1.Power output capacitor, filter capacitor

Isu tinowanzo tarisa kune capacitor yekupinza uye kubuda maseketi emagetsi module sefirita capacitor. Kunzwisisa kwakapusa ndeyekuti iyo capacitor inovimbisa kugadzikana kweiyo yekuisa uye inobuda magetsi ekupa. Mune module yemagetsi, iyo sefa capacitor inofanira kunge yakakura isati yadiki. Sezvinoratidzwa mumufananidzo, iyo sefa capacitor inoiswa hombe uyezve diki munzira yemuseve.

Paunenge uchigadzira magetsi, zvinofanirwa kucherechedzwa kuti wiring uye ganda remhangura rakakura zvakakwana uye huwandu hwemakomba hwakakwana kuti huve nechokwadi chekuti kuyerera kwesimba kunosangana nezvinodiwa. Hupamhi uye nhamba yemakomba zvinoongororwa pamwe chete nezvino.

Simba rekuisa capacitance

Iyo simba yekuisa capacitor inoumba yazvino loop ine switching loop. Ichi chazvino loop chinosiyana nehombe amplitude, Iout amplitude. Iyo frequency ndeye switching frequency. Munguva yekuchinja kweiyo DCDC chip, ikozvino inogadzirwa neichi chiuno chinoshanduka, kusanganisira nekukurumidza di/dt.

Mune synchronous BUCK mode, nzira inoenderera mberi inofanira kupfuura nepakati peGND pin ye chip, uye capacitor inopinza inofanira kubatanidzwa pakati peGND neVin yechip, saka nzira inogona kuva pfupi uye yakakora.

Nharaunda yemhete yemazuva ano idiki zvakakwana, zviri nani iyo radiation yekunze yemhete yemazuva ano ichave.

2.Decouupling capacitor
Iyo pini yemagetsi ye-high-speed IC inoda zvakakwana decoupling capacitors, zviri nani imwe papini. Muchigadziro chaicho, kana pasina nzvimbo ye decoupling capacitor, inogona kubviswa sezvakakodzera.
Iyo decoupling capacitance ye IC simba rekupa pini kazhinji idiki, senge 0.1μF, 0.01μF, nezvimwewo. Iyo inoenderana pasuru zvakare idiki, senge 0402 package, 0603 package uye zvichingodaro. Paunenge uchiisa decoupling capacitors, pfungwa dzinotevera dzinofanira kuonekwa.
(1) Isa padhuze nepaunogona napo pini yekugovera magetsi, zvikasadaro inogona kunge isisina decoupling mhedzisiro. Theoretically, iyo capacitor ine imwe decoupling radius, saka musimboti wepedyo unofanirwa kunyatsoitwa.
(2) Iyo decoupling capacitor kune magetsi epini inotungamira inofanirwa kuve ipfupi sezvinobvira, uye mutobvu unofanirwa kuve wakakora, kazhinji upamhi hwemutsara i8 ~ 15mil (1mil = 0.0254mm). Chinangwa chekukora ndechekudzikisa lead inductance uye kuve nechokwadi chekushanda kwemagetsi.
(3) Mushure mekupa magetsi uye mapini epasi e decoupling capacitor anoburitswa kunze kwewelding pad, rova ​​maburi ari padyo uye batanidza kune magetsi uye pasi ndege. Mutobvu unofanirawo kukora, uye gomba rinofanira kuva rakakura sezvinobvira. Kana gomba rine aperture ye10mil richikwanisa kushandiswa, 8mil buri harifanirwe kushandiswa.
(4)Iva nechokwadi chekuti decoupling loop idiki sezvinobvira

3.Energy kuchengetedza capacitor
Basa rekuchengetedza simba capacitor ndere kuona kuti IC inogona kupa simba munguva pfupi kana uchishandisa magetsi. Kugona kwesimba rekuchengetedza capacitor kazhinji hombe, uye inoenderana pasuru zvakare yakakura. MuPCB, simba rekuchengetedza capacitor rinogona kunge riri kure nemudziyo, asi kwete kure zvakanyanya, sezvakaratidzwa mumufananidzo. Iyo yakajairika simba yekuchengetedza capacitor fan-gomba modhi inoratidzwa mumufananidzo.

Nheyo dzemaburi e fan uye tambo ndedzinotevera:
(1) Iyo inotungamira ipfupi uye gobvu sezvinobvira, kuitira kuti pane diki parasitic inductance.
(2)Kune simba rekuchengetedza capacitor, kana zvishandiso zvine hombe overcurrent, baya maburi akawanda sezvinobvira.
(3) Ehe, kuita kwakanakisa kwemagetsi kwegomba re fan ndiro disc gomba. Chokwadi chinoda kunyatsotariswa