Loquens de difficili problemati copia copiae virtutis; PCB cloth plate problems is not very difficult, but if want to cloth up a refined PCB must be one of the difficulties in switching power supply (PCB design is not good, may cause no matter how to debug parameter debugging cloth out of the situation, so not scaremongering) when reason was the PCB board consideration or a lot of, such as: Electrical performance, process route, salus requisita, EMC ictum, etc.; Inter factores considerandi, electricum principalissimum est, sed EMC difficillimum est intellectu, et bottleneck multarum inceptorum in EMC iacet. Sequentia a 22 directionibus ad communicandum PCB tabulam et EMC.

1, ambitus perfectus potest esse otiosus PCB designatio EMI circuit

Ictum circuii supra EMC cogitari potest, input columellae hic sunt; Lightning-proof pressure sensitivity; Resistentia R102 ne concursu currenti (cum CURSUS ad damnum reducere); Key error mode X capacitance and Y capacitance with inductor filtering; Sunt de salute tabulae fuses; Quaelibet haec machinis maximi momenti est, et cuiusque artificii munus et actio diligenter aestimanda est. The EMC severity level should be considered when designing the circuit, such as the number of filters to be set, the number and location of the y-capacitor quantity. The choice of pressure-sensitive size and quantity is closely related to our requirements for EMC. Welcome to discuss the seemingly simple EMI circuit that actually contains profound truths for each component.

2. Circuitus et EMC : ( notissima volatilia topologia principalis, vide quae cardines ambitus EMC mechanismum continent)

The circled parts in the circuit in the figure above are very important for EMC (note that the green part is not), such as radiation. It is known that electromagnetic field radiation is spatial, but the basic principle is the change of magnetic flux, which involves the effective cross-sectional area of magnetic field, namely the corresponding loop in the circuit. The electric current can produce a magnetic field, which is stable and cannot be converted into an electric field. Sed mutatio electrici electrici mutans campum magneticum producit, et mutabilis campus magneticus campum electricum producere potest (re vera haec est aequatio celeberrima Maxwell et lingua simplici utens), et campus electricus mutans etiam magneticum agrum. Fac igitur operam dare locis ubi in/offs civitatibus sunt, id unum ex fontibus EMC, et hoc unum ex fontibus EMC. For example, the dotted line loop in the circuit is the opening and closing loop of the switch tube. Not only the switching speed can be adjusted during the design of the circuit, but also the area of the wiring loop of the layout board has an important influence on EMC! Aliae duae ansae sunt effusio loramenta et ansas rectificans, prius intellige in antecessum, et postea loquere!

3. Societas inter PCB design et EMC

1.PCB loop has a very important influence on EMC, such as flyback main power loop. If it is too large, the radiation will be poor.

2. Filter wiring effect, filter is used to filter out interference, but if PCB wiring is not good, filter may lose the effect it should have.

3. Structura pars, quae consilio radiator fundatio non bonae voluntatis ad versionem tutandam fundationem afficit;

4. Si pars sensitiva nimis propinqua est impedimento principii, ut EMI circuitio et tubus transibit, necessario ad pauperem EMC ducet, et area manifesta separatio requiritur.

5. Wiring of RC effusio ansa.

6.Y capacitor grounding and wiring, and the position of Y capacitor is also critical!

De hoc loquor, et de eo plura loqui, sed ducam tibi.

Here’s a quick example:

Ut in arca punctata in figura supra, X capacitor paxillus wiring incisus est. Discere potes quomodo capacitorem clavum externam wiring efficere (exprimendo venam wiring utens). Hoc modo effectus eliquationis X capacitoris ad optimum statum pervenire potest.

4. Praeparatio ad PCB designandum: (si plene paratus es, consilium gradatim stabilire potest, ne consilium evertendi et rursus incipiens)

There are roughly the following aspects, are their own design process to consider, all the content has nothing to do with other tutorials, are just their own experience summary.

1. Appearance structure size, including positioning hole, air channel flow direction, input and output socket, need to match with the customer system, also need to communicate with the customer assembly problems, height limit and so on.

2. Safety certification, products do what kind of certification, where do the basic insulation creepage distance to leave enough, where do strengthen the insulation to leave enough distance or slot.

3. Packaging design: there is no special period, such as preparation for customized packaging.

4. De processu itineris delectu: decuriae unicae duplicatae tabulae delectu, vel tabulae multi- strati, secundum schematicum schematicum et tabulam quantitatem, sumptus et alia aestimationem comprehensivam.

5. Other special requirements of customers.

The structure and process will be relatively more flexible, safety regulations or relatively fixed part, what certification to do, what safety standards, of course, there are some safety regulations are common in many standards, but there are also some special products such as medical treatment will be more stringent.

For the new entry engineer friends are not dazzled;

Next list some general products general, the following is summarized for IEC60065 specific cloth requirements, for safety needs to keep in mind, encounter specific products will be targeted processing:

1. Distantia input fusi caudex maior est quam 3.0mm secundum regulas securitatis exigente, et lamina actualis est 3.5mm (simpliciter loquendo, distans distans fuse per 3.5mm ante et 3.0mm post).

2. Before and after the rectifier bridge, the safety requirements are 2.0MM, and the plate layout is 2.5MM.

3. After rectification, safety regulations generally do not require, but the distance between high and low voltage is left according to the actual voltage, and 400V high voltage is left above 2.0mm.

4. Praecepta securitatis pro primo stadio 6.4mm (rimam electricam) requirunt et reptile spatium 7.6mm esse debet. (Nota hoc se habere ad intentionem initus actualis, necesse est referre ad tabulam pro certo calculi, notitiis tantum referendi, sub re ipsa re)

5. Cold ground and hot ground are clearly marked for the first stage; L, N nota, INPUT AC, INPUT nota, fuse praemonitio et sic deinceps notanda;

It is reiterated that the actual safety distance is related to the actual input voltage and the working environment, so it is necessary to refer to the table for specific calculation. The data provided is for reference only and shall prevail in the actual situation.

5. Consider other factors for PCB design safety

1. Understand what certification their products do and what product categories they belong to. For example, medical treatment, communication, electricity, TV and so on are different, but there are also many similarities.

2. Tutus in normis, intellige qualitates velit clausus locus cum PCB tabula, qui locus est fundamentalis velit, qui locus velit confirmatur, distantia vexillum diversum non idem est. Optimum est signa inhibere, et electrica distantiam computare, distantiam serpere.

3. Focus on the safety devices of the product, such as the relationship between the magnetism of the transformer and the original side;

4. Radiator and surrounding distance problem, radiator insulation is not the same as the ground is not the same, the ground is cold, hot insulation is the same cloth.

5. Special attention should be paid to the distance of insurance, requiring the strictest place. The distance between front and rear of the fuse is consistent.

6. Relatio inter Y capacitatem et ultrices venam et contactum.

Et cetera, quomodo distare spatium, quomodo salutem facere requisita erit explicabimus.

6, PCB consilium potestatis copia layout

1. Primum mensura PCB magnitudine et numero componentium, ut ad bonam densitatem consequendam, vel densum, sparsum erit deformis.

2. Modulare circulum, nucleum ut centrum sume, et primas machinas clavis pone.

3. Cogitatus est verticalis seu horizontalis anti-positionis, alterum pulchrum, alterum obturaculum in operatione opportunum, specialibus circumstantiis benificium considerare potest.

4. Take cabling into consideration and arrange the layout in the most reasonable position for subsequent cabling.

5. Quantum fieri potest in extensione ansa area reducere. Quattuor ansae postea singillatim explicabuntur.

Do the above points, of course, flexible use, more reasonable layout will be born soon.

Quae sequuntur, primum virgo PCB traxi, multis abhinc annis, valde difficile est ad perficiendum, licet parva quaestio media sit, sed generalis assituatio est eruditione dignissima;

In this figure, the power density is still relatively high. The control part of LLC, the auxiliary source part and the BUCK circuit driver (high-power multi-channel output) part are on the small board, which is not taken out. Let’s take a look at the layout characteristics of the main power:

1. Input et output terminales fixae sunt et moveri non possunt. Tabula rectangula est.

Propositio hic est ab imo ad summum, a sinistro ad dextrum, et calor dissipatio dependet a testa.

2.EMI ambitus adhuc patet fluere directionem, quae magni momenti est, alioqui non formosa et mala emc.

3. The position of large capacitor should consider PFC loop and LLC main power loop as far as possible;

4. The current of the side side is relatively large. In order to run the current and dissipate the heat of the rectifier tube, this layout is adopted. Summitatem virtutis altae iacuit plerumque negativa, et ima iacuit positiva.

Each board has its own characteristics, of course, also has its own difficulties, how to reasonably solve the key, we can understand the layout of reasonable selection of meaning?

7. Appreciation of PCB exempla

I think it is a good place to do it. Of course, there will always be defects, which can also be pointed out. It is not easy for a single panel to be so compact, so you can use this board to learn and discuss! A tergo etiam erit ad hanc tabulam ad explicandam eruditionem in primis fruendam.

8. Intellectus quattuor ansarum consiliorum PCB 🙁 postulatio PCB layout est parva area quattuor ansarum)

Praeterea, effusio ansa (RCD effusio, RC effusio tubi MOS et RC absorptionem tubi rectificati) etiam magni momenti est, quod etiam fascia quae frequentiam radiorum altam gignit. Si de figura superiore quaestiones habes, gratum est eas discutere. Quaestiones nullas timemus.

9. PCB designat maculam calidam (punctum potentiale fluctuans) et filum humus;

Repetita operam rebus:

1. Pay special attention to hot spots (high-frequency switching points), which are high-frequency radiation points. Cable layout has a great impact on EMC.

2. Fascia calidis maculis formata parva est et filum breve, nec spissum filum, sed dum satis est.

3. Funis humus in uno puncto fundi debet. Principalis potentia loco et loco dato separatus, sampling grounde distinctus.

4. Humus radiatoris coniungi debet cum potentia principali.