Bakeng sa lipatlisiso le nts’etsopele ea phepelo ea motlakase, Moralo oa 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.

E fapane hanyane le li-PCBS tse ling, ho chencha li-PCBS ho na le litšobotsi tse ling tsa tsona. Sengoloa sena se tla bua hakhutšoanyane ka melaoana ea mantlha ea wiring ea PCB bakeng sa ho chencha phepelo ea motlakase ho latela boiphihlelo ba boenjineri.

1, spacing

Ho arohana ha mohala ho lokela ho tsotelloa bakeng sa lihlahisoa tse phahameng tsa motlakase. Karohano e ka fihlelang litlhokahalo tsa melaoana ea polokeho ke eona e ntle ka ho fetisisa, empa makhetlo a mangata bakeng sa lihlahisoa tse sa hlokeng setifikeiti, kapa tse sa khoneng ho fihlela setifikeiti, karohano e khethoa ke boiphihlelo. Ke bophara bo bokae bo loketseng? E tlameha ho nahana ka tlhahiso hore na e netefatsa boto e hloekile bokaholimo, mongobo oa tikoloho, ts’ilafalo e ngoe e emetse maemo joang.

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. Likarolo tse pheletsong ea boto

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

Ho ka bonoa hore sesebelisoa se lokela ho ba hole le ho bapisoa le bohale ba se arohaneng, ho seng joalo karolo e ka senyeha ka lebaka la splitter ea PCB.

3. Loop area

Whether input or output, power loop or signal loop, should be as small as possible. Lupu ea motlakase e hlahisa tšimo ea motlakase, e tla lebisa ho litšobotsi tse mpe tsa EMI kapa lerata le leholo la tlhahiso; At the same time, if received by the control ring, it is likely to cause an exception.

Ka lehlakoreng le leng, haeba sebaka sa lupu sa motlakase se le seholo, ho ts’oaroa hoa likokoana-hloko ho tla eketseha, ho ka eketsang tlhoro ea lerata.

4. Key wiring

Ka lebaka la phello ea DI / DT, ho fokotsa matla ho node e matla ho tlameha ho fokotsoa, ​​ho seng joalo tšimo e matla ea motlakase e tla hlahisoa. Haeba u batla ho fokotsa ho hloka matla, ha e le hantle u batla ho fokotsa bolelele ba wiring, eketsa khato ea bophara e nyane.

5. Likhoele tsa lipontšo

Bakeng sa karolo eohle ea taolo, ho lokela ho tsotelloe wiring hole le karolo ea motlakase. Haeba tse peli li atamelane ka lebaka la lithibelo tse ling, mohala oa taolo le mohala oa motlakase ha lia lokela ho ts’oana, ho seng joalo li ka lebisa ts’ebetsong e sa tloaelehang ea phepelo ea motlakase, ts’abo.

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. FEIE. 2 e bonts’a mekhoa e nepahetseng le e fosahetseng ea mekhoa ea ho tsamaisa lipontšo lipakeng tsa A le B.

Setšoantšo sa 2 Mekhoa e nepahetseng le e fosahetseng ea mekhoa ea ho tsamaisa li-cable.

Ehlile, mohala oa lets’oao o lokela ho fokotsa khokahano ka masoba!

6, copper

Ka linako tse ling ho beha koporo ha ho hlokahale ebile ho lokela ho qojoa. Haeba koporo e ne e le kholo ka ho lekana mme matla a eona a fapane, e ne e ka sebetsa joalo ka lenakana, e bonesang maqhubu a motlakase ho e potoloha. Ka lehlakoreng le leng, ho bonolo ho nka lerata.

Ka kakaretso, ho beoa ha koporo ho lumelloa feela ho li-node tsa tuli, joalo ka “node ea” fatše “qetellong ea tlhahiso, e ka eketsang ka nepo phallo ea matla le ho sefa lipontšo tsa lerata.

7, ‘mapa,

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. Ho joalokaha eka sete ea litšitiso tse nang le litekanyetso tse fapaneng tsa impedance li hokahane ka mokhoa o ts’oanang, ‘me hajoale e tla ikhethela tsela e nang le impedance e tlase ho feta.

U ka kenya terata karolo ea taolo ea potoloho ka lehlakoreng le leng, ‘me u behe koporo holima node ea “fatše” ka lehlakoreng le leng, ebe u kopanya mahlakore ka bobeli ka lesoba.

8. Phallo ea li-rectifier diode

Haeba sehlahisoa se hlahisang sehlahisoa se haufi le sehlahisoa, ha sea lokela ho beoa ka tsela e ts’oanang le sehlahisoa. Ho seng joalo, tšimo ea motlakase e hlahisoang ke diode e tla phunyeletsa sekoting se entsoeng ke matla le mojaro o kantle, e le hore lerata le lekantsoeng la khumo le eketsehe.

FEIE. 3 Ho beoa ka mokhoa o nepahetseng le o fosahetseng ha diode

9, terata ea fatše,

Mehala ea likhoele e lokela ho ba hlokolosi haholo. Ho seng joalo, EMS, EMI le ts’ebetso e ngoe li ka mpefala. Bakeng sa ho chencha phepelo ea motlakase “mobu” oa PCB, bonyane lintlha tse peli tse latelang: (1) mobu oa motlakase le mohala oa lets’oao, e lokela ho ba khokahano ea ntlha e le ‘ngoe; (2) Ha hoa lokela hore ho be le sebaka sa mobu.

10. Y capacitance

Keketso le tlhahiso li lula li hokahantsoe le Y capacitor, ka linako tse ling ka mabaka a mang, e kanna ea se khone ho leketla mobung oa li-input capacitor, hopola ka nako ena, e tlameha ho hokahanngoa le node e tsitsitseng, joalo ka sethala se phahameng sa motlakase.

11, tse ling

Ha ho raloa PCB ea phepelo ea motlakase ea nnete, ho kanna ha ba le lintlha tse ling tse lokelang ho nahanoa, joalo ka “varistor e lokela ho ba haufi le potoloho e sirelelitsoeng”, “induction mode e tloaelehileng ho eketsa meno a tsoang”, “chip VCC phepelo ea motlakase e lokela eketsa capacitor ”joalo-joalo. Ntle le moo, tlhoko ea kalafo e khethehileng, joalo ka foil ea koporo, ho sirelletsa, jj, le eona e lokela ho tsotelloa mohatong oa moralo oa PCB.

Ka linako tse ling hangata ho thulana le melao-motheo e ‘maloa e loantšanang, ho kopana le e’ ngoe ea tsona e ke keng ea kopana le e ‘ngoe, ena ke tlhoko ea hore baenjiniere ba sebelise boiphihlelo bo seng bo le teng, ho latela litlhoko tsa projeke, ho fumana mohala o nepahetseng ka ho fetisisa!