Ntawv luam tawm hauv Circuit Court board (PCB) is the support of circuit components and components in electronic products. It provides the electrical connection between circuit components and components. It is the most basic component of various electronic equipment, and its performance is directly related to the quality of electronic equipment. Nrog kev txhim kho cov ntaub ntawv hauv zej zog, txhua yam khoom siv hluav taws xob feem ntau ua haujlwm ua ke, thiab kev cuam tshuam ntawm lawv ntau dua thiab ntau dua. Yog li ntawd, kev sib nqus hluav taws xob tau dhau los ua tus yuam sij rau kev ua haujlwm ib txwm ntawm cov tshuab hluav taws xob. Ib yam li ntawd, nrog kev txhim kho thev naus laus zis thev naus laus zis, qhov ceev ntawm PCB tau nce siab dua thiab ntau dua. Qhov zoo ntawm PCB tsim muaj kev cuam tshuam loj rau kev cuam tshuam thiab tiv thaiv kev cuam tshuam kev muaj peev xwm ntawm Circuit Court. Ntxiv nrog rau kev xaiv cov khoom siv thiab tsim hluav taws xob, cov xov hluav taws xob PCB zoo kuj tseem yog ib qho tseem ceeb heev hauv kev sib nqus hluav taws xob kom ua tau zoo tshaj plaws ntawm cov hluav taws xob hluav taws xob.

Since the PCB is an inherent component of the system, enhancing electromagnetic compatibility in the PCB wiring does not incur additional costs to the final product completion. However, in printed circuit board design, product designers often only pay attention to improve density, reduce the occupation of space, simple production, or the pursuit of beautiful, uniform layout, ignoring the impact of circuit layout on electromagnetic compatibility, so that a large number of signals radiation into the space to form harassment. Cov xov tooj PCB tsis zoo tuaj yeem ua rau muaj teeb meem emc ntau dua li nws tuaj yeem tshem tawm. Muaj ntau zaus, txawm tias ntxiv cov ntxaij lim dej thiab cov khoom siv tsis tuaj yeem daws cov teeb meem no. Thaum kawg, tag nrho pawg thawj coj yuav tsum tau rov ua dua. Yog li ntawd, txhim kho tus cwj pwm xov tooj PCB zoo yog txoj hauv kev kom raug nqi tshaj plaws los pib.

Ib yam uas yuav tsum nco ntsoov yog tsis muaj txoj cai nruj rau PCB thaiv thiab tsis muaj cov cai tshwj xeeb uas npog tag nrho cov kab hluav taws xob PCB. Feem ntau cov xov hluav taws xob PCB raug txwv los ntawm qhov loj ntawm lub rooj tsav xwm hauv Circuit Court thiab cov tooj liab-txheej txheej. Qee cov txheej txheem thaiv kab mob uas tuaj yeem siv rau hauv ib lub Circuit Court tab sis tsis yog rau lwm qhov yog nyob ntawm qhov kev paub ntawm tus kws tsim hluav taws xob thaiv. Txawm li cas los xij, muaj qee txoj cai dav dav, uas yuav tham txog hauv qab no.

Rau kev tsim qauv zoo. PCB nrog tus nqi qis yuav tsum ua raws cov hauv paus ntsiab lus hauv qab no:

2. Layout ntawm Cheebtsam ntawm PCB

Ua ntej tshaj plaws, nws yog qhov tsim nyog los txiav txim siab PCB loj npaum li cas. Thaum PCB qhov loj me dhau, kab ntawv luam tawm ntev, qhov cuam tshuam nce ntxiv, lub peev xwm los tiv thaiv lub suab qis, thiab tus nqi nce. Me me dhau, cov cua sov ua kom tsis zoo, thiab cov kab uas nyob ib sab muaj qhov cuam tshuam rau cuam tshuam. Tom qab txiav txim siab PCB loj. Tom qab ntawd nrhiav cov khoom tshwj xeeb. Thaum kawg, raws li chav ua haujlwm ntawm Circuit Court, txhua qhov khoom siv hauv Circuit Court tau teeb tsa.

A digital circuit in an electronic device. Cov khoom siv hluav taws xob sib piv thiab cov khoom siv hluav taws xob sib txuas thiab cov yam ntxwv sib txuas sib txawv, lawv tsim kev cuam tshuam thiab cuam tshuam kev cuam tshuam kev cuam tshuam yog txawv. Also high frequency. Vim tias qhov sib txawv sib txawv, kev cuam tshuam ntawm cov hluav taws xob tsawg zaus thiab cov txheej txheem ntawm kev cuam tshuam kev cuam tshuam yog txawv. Yog li hauv kev teeb tsa kev tiv thaiv, yuav tsum muaj digital Circuit. The analog circuit and the power supply circuit are placed separately to separate the high frequency circuit from the low frequency circuit. If there are conditions, they should be isolated or made into a circuit board separately. Tsis tas li ntawd, kev teeb tsa yuav tsum tau them nyiaj tshwj xeeb kom muaj zog. Weak signal device distribution and signal transmission direction.

In printed board layout high speed. Txog rau qhov nruab nrab-nrawm thiab qis-logic circuits, cov khoom siv yuav tsum tau teeb tsa raws li qhia hauv daim duab 1-1.

Ib yam li lwm cov kev sib tw logic, cov khoom siv yuav tsum tau muab tso kom ze li sai tau rau ib leeg thiaj li ua tiav qhov ua tau zoo los tiv thaiv suab nrov. The position of components on the PRINTED circuit board should take full account of emi. Ib ntawm cov hauv paus ntsiab lus yog khaws cov coj ntawm cov khoom sib xws kom luv li sai tau. Hais txog kev teeb tsa, qhov sib piv ntawm cov teeb liab, cov khoom siv hluav taws xob nrawm nrawm, thiab lub suab nrov qhov chaw (xws li kev xa tawm, hloov hluav taws xob tam sim no, thiab lwm yam) yuav tsum raug sib cais kom txo qis cov teeb liab sib txuas ntawm lawv, raws li qhia hauv daim duab 1 -②

Clock generator. Crystal oscillator and CPU clock input are prone to noise, to be closer to each other. Noisy devices. Low current circuit. Large current circuits should be kept away from logic circuits as far as possible. Nws yog ib qho tseem ceeb uas yuav tsum tau ua cais pawg thawj coj saib yog tias ua tau.

2.1 The following principles shall be observed when determining the location of special components: (1) Shorten the connection between high-frequency components as far as possible, and try to reduce their distribution parameters and electromagnetic interference between each other. Cov khoom siv cuam tshuam tau yooj yim yuav tsum tsis txhob nyob ze ib leeg, thiab cov khoom siv thiab cov khoom tsim tawm yuav tsum nyob deb li deb tau.

(2) Tej zaum yuav muaj qhov sib txawv muaj peev xwm sib txawv ntawm qee cov khoom lossis cov xov hlau, yog li qhov nrug ntawm lawv yuav tsum tau nce ntxiv kom tsis txhob raug xwm txheej luv luv tshwm sim los ntawm kev tso tawm. Cheebtsam uas muaj hluav taws xob siab yuav tsum kom deb li deb tau tso rau hauv qhov chaw tsis yooj yim siv tau los ntawm txhais tes thaum debugging.

(3) Cheebtsam uas nws hnyav tshaj 15g. Nws yuav tsum tau braced thiab ces welded. Cov ntawd loj thiab hnyav. Cov khoom siv nrog cov ntsuas ntsuas siab yuav tsum tsis txhob muab tso rau ntawm lub rooj tsav xwm luam tawm, tab sis ntawm lub chassis ntawm lub tshuab tag nrho, thiab qhov teeb meem ntawm cov cua sov yuav tsum tau txiav txim siab. Cov cua sov yuav tsum tau nyob deb ntawm cov cua sov.

(4) rau potentiometer. Adjustable inductor kauj. Hloov pauv capacitor. Cov txheej txheem ntawm cov khoom siv kho tau xws li microswitch yuav tsum xav txog cov txheej txheem tsim nyog ntawm tag nrho lub tshuab. Yog tias lub tshuab hloov kho, yuav tsum tau muab tso rau ntawm daim ntawv luam tawm saum toj no yooj yim los kho qhov chaw; Yog tias lub tshuab hloov kho sab nraud, nws txoj haujlwm yuav tsum raug hloov mus rau txoj haujlwm ntawm kev kho lub pob qhov rooj ntawm lub vaj huam sib luag chassis.

(5) Txoj hauj lwm nyob ntawm qhov chaw tso thiab kho qhov sib dhos ntawm daim ntawv luam tawm yuav tsum tau muab tso tseg.

2.2 Cov txheej txheem ntawm txhua ntu hauv Circuit Court raws li cov kev ua haujlwm hauv Circuit Court yuav tsum ua raws cov hauv qab no:

(1) Teem txoj haujlwm ntawm txhua chav haujlwm ua haujlwm raws li cov txheej txheem hauv Circuit Court, kom cov qauv teeb tsa tau yooj yim rau cov teeb liab ntws thiab lub teeb liab khaws tib txoj kev kom deb li deb tau.

(2) Mus rau cov khoom tseem ceeb ntawm txhua txoj haujlwm ua haujlwm ua lub hauv paus, ib puag ncig nws kom ua tiav qhov teeb tsa. Cheebtsam yuav tsum zoo ib yam. Thiab huv si. Kev sib sau ua ke ntawm PCB kom txo qis thiab ua kom luv luv thiab sib txuas ntawm cov khoom siv. (3) Rau kev siv hluav taws xob ua haujlwm ntawm ntau zaus, yuav tsum tsis txhob faib cov khoom nruab nrab ntawm cov khoom siv. Hauv kev siv hluav taws xob dav dav, cov khoom siv yuav tsum tau teeb tsa ua ke kom ntau li ntau tau. Txoj hauv kev no, tsis tsuas yog zoo nkauj, thiab yooj yim rau nruab vuam, yooj yim rau kev tsim khoom loj.

(4) Cheebtsam nyob ntawm ntug ntawm lub rooj tsav xwm hauv Circuit Court, feem ntau tsis pub tsawg tshaj 2mm los ntawm ntug ntawm lub rooj tsav xwm hauv Circuit Court. Qhov zoo tshaj plaws ntawm lub rooj tsav xwm yog daim duab plaub. Ntev rau dav piv 3: 2 lossis 4: 3. Qhov loj ntawm lub rooj tsav xwm hauv Circuit loj dua 200x150mm. Kev txiav txim siab yuav tsum tau muab rau lub zog ntawm lub tshuab hluav taws xob hauv Circuit Court.

2.3 Kev teeb tsa dav dav rau PCB cov khoom siv:

Cov ntsiab lus ntawm Circuit thiab cov teeb liab yuav tsum tau teeb tsa kom txo qis kev sib txuas ntawm cov cim tsis xav tau:

(1) Cov teeb liab hluav taws xob qis yuav tsum tsis txhob nyob ze rau qib siab teeb liab channel thiab cov kab hluav taws xob yam tsis muaj kev lim dej, suav nrog cov kab hluav taws xob uas tuaj yeem tsim cov txheej txheem ib ntus.

(2) Sib cais theem qis analog Circuit Court los ntawm digital Circuit kom tsis txhob muaj cov analog Circuit Court. Cov hluav taws xob digital thiab lub voj sib txuas ntawm cov khoom siv hluav taws xob tsim cov kev sib txuas tsis sib xws.

(3) siab. Hauv. Kev siv logic nrawm nrawm siv thaj chaw sib txawv ntawm PCB.

(4) Qhov ntev ntawm kab teeb liab yuav tsum tau txo kom tsawg thaum tsim cov phiaj xwm

(5) Ua kom ntseeg tau ntawm cov phaj uas nyob ib sab. Nruab nrab ntawm cov txheej uas nyob ib sab ntawm tib lub rooj tsavxwm. Tsis txhob muaj cov kab hluav taws xob sib txuas ntev ntev dhau ntawm cov xov txuas ib sab ntawm tib txheej.

(6) Electromagnetic cuam tshuam (EMI) lim yuav tsum nyob ze rau EMI qhov chaw li sai tau thiab muab tso rau hauv tib lub rooj tsav xwm.

(7) DC/DC hloov pauv. Hloov cov ntsiab lus thiab cov rectifiers yuav tsum tau muab tso ze rau ntawm lub tshuab hluav taws xob kom tsawg li tsawg tau ntawm lawv cov xov hlau

(8) Tso qhov ntsuas qhov ntsuas hluav taws xob thiab lim lub ntsuas hluav taws xob kom ze li sai tau rau lub rectifier diode.

(9) Lub rooj tsav xwm luam tawm tau muab faib raws qhov zaus thiab qhov hloov pauv tam sim no, thiab lub suab nrov thiab lub suab uas tsis yog lub suab yuav tsum nyob deb dua.

(10) Cov kab hluav taws xob-cuam tshuam yuav tsum tsis txhob sib txuas mus rau qhov siab-tam sim no, kev hloov pauv ceev.