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AC / DC converter device of electromagnetic interference generated by


Measurement for SCR of EMI receiver measurement) clamor for EMI3EM] Although inhibition of various filters can be used with high power factor rectifier, or to solve common power rectifiers EMI, but the most simple, by 4 ・ No. 3,2000 JOURNALOFNALUNIVERSITYOFENGINEERINGSumNo92 economic and effective measures to suppress EMI is in parallel across the diode rectifier RC snubber circuit analysis shows that from the front, mainly in the diode rectifier circuit off when the electromagnetic interference, and 8 (2R control circuit mainly generated when the opening electromagnetic interference. can be used at both ends of shunt capacitors in the rectifier to reduce EMI. Figure 9 shows the impact of shunt capacitors. This is directly connected to the grid measuring a half-wave circuit EMI. But in fact due to the capacitor in parallel with the rectifier and leakage inductance connected to the formation of oscillation, it is not only just put a capacitor in parallel with the rectifier. In order to prevent oscillation,[link widoczny dla zalogowanych], but also a resistor in series with the capacitor. Despite the inhibitory effect of RC buffer noise is worse than that of pure capacitors, but uses the RC buffer rectifier, the EMI did not use RC buffer than the rectifier is much lower. in the semiconductor data sheet for noise suppression also includes the RC network of recommended values. SCR circuit in the buffer the effects of RC circuit than in the rectifier effect has to be worse. Specifically, SCR, in its turn generated when a high EMI, and Rc are mainly used to suppress the buffer off the noise it generated when the HF, Rc buffer only by a small range of firing angle Small EMI. Figure 10 and drew a full-wave half controlled SCR circuit in a RC network and non-contact situations RC A measured spectrum. measured at the trigger angle 9O. circumstances. You can see that in frequencies below a few MHz, there are RC SCR buffer control circuit, the EMI even more than the EMI-free buffer also slightly higher in case of Figure 9 .4 Conclusion rectifier din interference spectrum as a function of shunt capacitors for the controlled rectifier circuit,[link widoczny dla zalogowanych], because the interference of the main thyristor conduction is produced by the SCR, and therefore the load size. But when the firing angle is zero,[link widoczny dla zalogowanych], that is not controlled rectifier, when interference is generated by the turn-off thyristor ,[link widoczny dla zalogowanych], mainly related with the load, the greater the load, the greater the interference. Controlled Rectifier electromagnetic interference unrelated to the basic nature of the load,[link widoczny dla zalogowanych], but close to the firing angle, firing angle increases from 0 to 90. When the interference is from the smallest to largest, then began to interfere with the value increases with the decline in the firing angle. References [1] AHandbookSeriesOilElectromagneticInterferenceandCompatibility.Vol1-6.ICT, Gaineville, Virginia1971 [23LaszioTihang [. ElectromagneticCompatibilityinPowerErectronics.NewYork: IEEEPRESS, 1995. [3 Ma Weiming. Power Electronic Systems EMC Wuhan: Wuhan University of Hydraulic and Electric Press, 2000.AnalysisofElectromagneticInterferenceProducedbyAC/DCConvertersMaWeimingTuChangqiAbstract: Basedontheanalysisofelectromagneticinterference (EMI) producedbypowersemieonductors, experimentshavebeenmadeonordinaryphase-eontro1rectificationcircuitstOstudytheeausesofEMiproduction + itsnature, characterlst】 csandsuppressionmethods.Therebyareliablebasis / oroptimizationdesignofAC / DCconvertersisprovided.Keywords: electromagneticinterference; converter; rectification

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