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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4376 датащи(PDF) 35 Page - STMicroelectronics |
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AN4376 датащи(HTML) 35 Page - STMicroelectronics |
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35 / 37 page  DocID025380 Rev 1 35/37 AN4376 PFC waveforms 37 7.9 Conducted emission pre-compliance test From Figure 48 to Figure 51 are the average measurements of the conducted noise with 23 LED load and nominal mains voltages. The limits shown on the diagrams are those of the EN55022 Class-B, which is the most popular standard for domestic equipment. As visible in the diagrams, good margins with respect to the limits are present in all test conditions. Increasing the CX capacitor value of the EMI filter will improve the safe margin but affecting the PF. A compromise has been fixed in this design. Note that a CY capacitor between the negative output pin of the converter and ground has been placed to filter common mode noise flowing into the demonstration board. Figure 48. 100 VAC and 23 LED load - phase Figure 49. 100 VAC and 23 LED load - neutral Figure 50. 230 VAC and 23 LED load - phase Figure 51. 230 VAC and 23 LED load - neutral |
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