Rešitev za the emc problem of komunikacija stikalo napajanje napajanje
Komunikacija preklapljanje napajanje je široko rabljeno in program nadzorovano preklapljanje, optično podatki prenos, brezžično bazno postaje, kabel televizija sistemi, in IP omrežja due do njegove prednosti od majhna velikost, lahka teža, visoka učinkovitost , zanesljiva operacija, in daljinski nadzor. It is the vožnja sila za normalno delovanje of informacija tehnologija oprema.
Z razvoj informacija tehnologija, informacije tehnologija oprema is razpršenost po vsej državi, od razvita osrednja mesta v oddaljena gorska območja, zagotavljanje veliko priročnost za komunikacijo in informacije prenos med ljudmi. Due do the razlike mestna in podeželska območja, moč o oskrba omrežje komunikacija oprema vključuje oboje stabilno veliko moč omrežje omrežje omrežje omrežje napajanje napajanje napajanje metode in neodvisno majhna vodna energija energija oskrba metode. pod napajanje dobava način način majhne hidroelektrarne postaje, due to spremembe v voda prostornina, znatne spremembe v poraba poraba 2c in nestabilno delovanje moči proizvodnja oprema, the valovna oblika popačenje od moč omrežje is huda in napetost nihanja so velika. At isto isto čas, nestandardno ožičenje od the distribucija sistem predstavlja a hudo izziv do the the the komunikacija stikalo napajanje napajanje.
Železnica komunikacija in moč komunikacija se razvija in raste. Due do the močna inducirana napetost ustvarjena z električna lokomotiva, tla napetost nih nih veliko, rezultat v pomembno nihanje v v mreža napetost. A močna električna poljska lahko lahko vzrok prehodna nestabilnost v delovanje preklop moč napajanje napajanje oprema oprema. The komunikacija stikalo moč napajanje delovanje blizu visoka napetost moč mreža, čeprav mreža napetost je stabilna, je enostavno prizadeta močna elektromagnetna polje interferenca povzročena z spremembe v mreža obremenitev.
Zato , the komunikacija stikalo moč oskrba bi moralo imeti močno elektromagnetno interferenco upornost, zlasti prilagodljivost do strela udarci, prenapetosti, in mreža napetost nihanja. It bi moralo imeti zadostno anti-interference sposobnost statično interferenčno, električno polje, magnetno valovno, in elektromagnetno valovi, zagotavljanje ITS normalno delovanje in stabilnost v napajanje do komunikacija oprema oprema.
On the other hand, due to the power switch transistor, rectifier or freewheeling diode, and main power transformer inside the communication switching power supply working in the mode of high-voltage, high current, and high-frequency switching, the voltage and current waveform is mostly square wave. During the square wave switching process of high voltage and high current, severe harmonic voltage and current will be generated. These harmonic voltages and currents are transmitted through the input line of the power supply or the output line of the switching power supply, causing interference to other devices and the power grid that are powered by the communication power supply on the same power grid. At the same time, they also cause interference to devices powered by the communication power supply, such as program controlled switching equipment, wireless base stations, optical transmission equipment, and cable television equipment, making them unable to work properly; On the other hand, severe harmonic voltage and current generate electromagnetic interference inside the switching power supply, which causes instability in the internal operation of the switching power supply and reduces its performance. Some electromagnetic fields radiate into the surrounding space through the gaps in the switch power supply casing, and together with the radiated electromagnetic fields generated through power lines and DC output lines, they propagate through space, causing interference to other high-frequency equipment and equipment sensitive to electromagnetic fields, leading to abnormal operation of other equipment.
Elektromagnetna združljivost težave od preklapljanje napajanje napajalniki
The electromagnetic compatibility issues caused by communication switching power supply operating in high voltage and high current switching states are quite complex. In terms of electromagnetic compatibility of the entire machine, there are mainly several types: common impedance coupling, line to line coupling, electric field coupling, magnetic field coupling, and electromagnetic wave coupling. The three elements of electromagnetic compatibility are: interference source, propagation path, and interference object. Common impedance coupling mainly refers to the common impedance between the interference source and the interfered object electrically, through which the interference signal enters the interfered object. Line to line coupling mainly refers to the mutual coupling between wires or PCB wires that generate interference voltage and interference current due to parallel wiring. Electric field coupling is mainly due to the presence of potential differences, resulting in the coupling of the induced electric field to the interfered body. Magnetic field coupling mainly refers to the coupling of low-frequency magnetic fields generated near high current pulse power lines to interference objects. Electromagnetic wave coupling is mainly caused by high-frequency electromagnetic waves generated by pulsating voltage or current, which radiate outward through space and couple with the corresponding interfering body. In fact, each coupling method cannot be strictly distinguished, only with different focuses.
In a switching power supply, the main power switch operates in a high-frequency switching mode at a high voltage. The switching voltage and current are both square waves, and the spectrum of higher-order harmonics contained in this square wave can reach more than 1000 times the frequency of the square wave. At the same time, due to the leakage inductance and distributed capacitance of the power transformer, as well as the unsatisfactory working state of the main power switching device, high-frequency and high-voltage peak harmonic oscillations are often generated when high-frequency is turned on or off. The higher-order harmonics generated by this harmonic oscillation are transmitted to the internal circuit through the distributed capacitance between the switch tube and the heat sink or radiated into space through the heat sink and transformer. Switching diodes used for rectification and continuation are also an important cause of high-frequency interference. Due to the high-frequency switching state of the rectifier and freewheeling diodes, the presence of parasitic inductance and junction capacitance in the diode leads, as well as the influence of reverse recovery current, causes them to operate at high voltage and current change rates, resulting in high-frequency oscillations. Due to the fact that rectifier and freewheeling diodes are generally close to the power output line, the high-frequency interference generated by them is most likely to be transmitted through the DC output line.
V vrstnem redu za izboljšanje moč faktor, aktivno moč faktor popravek so uporabljeni v komunikacija stikalo napajanje napajanje. At isto čas, in vrsta za izboljšanje učinkovitost in zanesljivost od toko vezje in zmanjšanje električni stres moč naprave, a veliko število of mehko preklapljanje tehnologije so bile sprejete. Among them, nič napetost, nič tok, or nič napetost nič napetost nič tok tok preklapljanje tehnologija is the največje široko uporabljeno. To tehnologija v veliki meri zmanjša the elektromagnetna interferenca generirana z preklapljanje naprave. Vend, mehko preklapljanje brez izgub absorpcija vezja pogosto uporaba l in c za energija prenos, uporaba enosmerna prevodnost diode doseganje enosmerna energija pretvorba. Zato , the diode v to resonančno vezje posta a glavni vir vir elektromagnetni interferenčni.
