Zvekutsvaga uye kusimudzira kwekuchinja magetsi, Pcb dhizaini 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.

Zvishoma zvakasiyana nedzimwe Hardware PCBS, switching power PCBS ine mamwe maitiro avo. Chinyorwa ichi chichataura muchidimbu nezve mamwe emitemo yakakosha yePCB wiring yekuchinja magetsi zvichienderana neinjiniya ruzivo.

1, spacing

Kutsemuka kwemutsara kunofanirwa kutariswa kune yakakwira magetsi zvigadzirwa. Mukana unokwanisa kuzadzikisa zvinodiwa nemitemo yekuchengetedza inoenderana ndiyo yakanyanya kunaka, asi nguva zhinji yezvigadzirwa izvo zvisingade chitupa, kana zvisingakwanise kuwana chitupa, nzvimbo inotsanangurwa neruzivo. Ndeupi upamhi hwenzvimbo hwakakodzera? Unofanira kufunga nezve kugadzirwa kuti uvimbise kuchena kwepabhodhi, hunyoro hwezvakatipoteredza, kumwe kusvibiswa kumirira mamiriro ezvinhu sei.

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. Zvikamu pamucheto webhodhi

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

Inogona kuonwa kuti chishandiso chinofanira kunge chiri kure uye chakaenzana kumucheto kwekutsemura, zvikasadaro chinhu icho chinogona kukuvara nekuda kwePBB splitter.

3. Loop area

Whether input or output, power loop or signal loop, should be as small as possible. Iyo simba chiuno inoburitsa magetsi emagetsi munda, izvo zvinotungamira kune yakashata EMI hunhu kana hombe kuburitsa ruzha; At the same time, if received by the control ring, it is likely to cause an exception.

Kune rimwe divi, kana iyo simba chiuno nzvimbo iri hombe, iyo yakaenzana yezvipembenene inductance ichawedzerawo, iyo inogona kuwedzera iyo yekudonha ruzha nhongonya.

4. Kiyi wiring

Nekuda kwekuita kweDI / DT, iyo inductance pane iyo inosimba node inofanira kuderedzwa, zvikasadaro simba remagetsi remagetsi rinogadzirwa. Kana iwe uchida kudzikisa inductance, ichinyanya kuda kudzikisa kureba kwetambo, kuwedzera upamhi chiito idiki.

5. Tambo dzemasaini

Kune iyo yese chikamu chekutonga, kufunga kunofanirwa kupihwa kune wiring kure nechikamu chemagetsi. Kana izvo zviviri zviri padhuze nepadhuze nekuda kwezvimwe zvinorambidzwa, tambo yekudzora netambo yemagetsi haifanire kufananidzwa, zvikasadaro zvinogona kutungamira mukusaita mashandiro emagetsi, kuvhunduka.

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. NGUVA. 2 inoratidzira iyo chaiyo uye isiriyo chiratidzo tambo yekufambisa nzira pakati peA naB.

Mufananidzo 2 Yakarurama uye isiriyo chiratidzo tambo nzira dzenzira.

Ehe, tambo yemasaini inofanirwa kudzikisira kubatana kuburikidza nemakomba!

6, mhangura

Dzimwe nguva kuisa mhangura hazvidi zvachose uye kunofanira kudzivirirwa. Kana iyo mhangura yaive yakakura zvakakwana uye nemhepo yayo ichisiyana, inogona kuita senge antenna, ichipenya magetsi emagetsi anokomberedza. Kune rimwe divi, zviri nyore kutora ruzha.

Kazhinji, kuiswa kwemhangura kunongobvumidzwa pane zvimiti zvimire, zvakaita se “pasi” podhi pamagumo ekubuda, ayo anogona kunyatso kuwedzera kuburitsa capacitance uye kusefa mamwe maratidziro eruzha.

7, mepu,

Kune redunhu, mhangura inogona kuiswa kune rimwe divi rePCB, iyo inozvimhanyisa mepu kune wiring kune rimwe divi rePBB kudzora impedance yedunhu. Zvinoita sekunge seti yezvipingamupinyi nemhando dzakasiyana dzemhedheni dzakabatana zvakafanana, uye iyo yazvino inosarudza yega nzira ine yakaderera impedance yekuyerera nayo.

Iwe unogona kunyatso tesa chikamu chekutonga wedunhu kune rimwe divi, woisa mhangura pane “pasi” node kune rimwe divi, uye wobatanidza mativi maviri nepaburi.

8. Chigadzirwa chinogadzirisa diode

Kana iyo goode inogadzirisa diode iri padyo nezvinobuda, haifanire kuiswa yakafanana neinobuda. Zvikasadaro, munda wemagetsi unogadzirwa padhodhi unopinda mukati mechidzitiro chakaumbwa nesimba rinobuda uye mutoro wekunze, kuitira kuti ruzha rwakayerwa rwuwedzere.

NGUVA. 3 Kurongeka uye kusarongeka kuiswa kwemadhiodhi

9, pasi waya,

Wiring yetambo dzepasi dzinofanira kuve dzakangwarira kwazvo. Zvikasadaro, EMS, EMI uye kumwe kuita kungadzikire. Zvekuchinja magetsi pcb “pasi”, zvirinani zvinotevera zvibodzwa zviviri: (1) simba pasi uye chiratidzo pasi, inofanirwa kuve imwechete poindi kubatana; (2) Panofanirwa kunge pasina pevhu chiuno.

10. Y capacitance

Kuisa uye kuburitsa zvinowanzo kuve zvakabatana neY capacitor, dzimwe nguva nekuda kwezvimwe zvikonzero, zvinogona kusakwanisa kuturika pane yekuisa capacitor pasi, rangarira panguva ino, inofanirwa kuve yakabatana neiyo tuli node, senge yakakwira voltage terminal.

11, zvimwe

Kana uchigadzira iyo PCB yemagetsi magetsi, panogona kunge paine dzimwe nyaya dzekufunga nezvadzo, sekuti “varistor inofanirwa kunge iri padhuze nedunhu rakachengetedzwa”, “yakajairika modhi induction yekuwedzera mazino anobuda”, “chip VCC magetsi anofanirwa wedzera capacitor ”zvichingodaro. Uye zvakare, iko kudikanwa kwekurapwa kwakakosha, senge yemhangura foil, kudzivirirwa, nezvimwewo, kunofanirwa kutariswawo muchikamu chePCB dhizaini.

Dzimwe nguva kazhinji vanosangana nemitemo yakawanda inopesana, kusangana neumwe wavo haugone kusangana neumwe, uku ndiko kudikanwa kwemainjiniya kushandisa ruzivo rwuripo, zvinoenderana nezvinodiwa zveprojekti, sarudza wiring yakakodzera kwazvo!