title: COSEL Power Supply, Noise Filter 2025 Product Catalog

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COSEL Power Supply, Noise Filter 2025 Product Catalog

2Selection of EMI FiltersOutput voltage [V]200100Figure 2.11.2 gives an example of comparing pulseattenuation characteristics for an EMI filter using a generalferrite core and one using an amorphous core.The graph suggests that the amorphous core preventsthe voltage of output pulses from increasing quickly inrelation to rising input pulse voltage (a good pulseattenuation characteristic).Beyond a given volt-time product the choke coil of anEMI filter will saturate, resulting in significantly reducednoise suppression. The volt-time product (V . T) thatcauses the core to reach magnetic saturation is foundwith the following calculation expression:12[Pulse attenuation characteristic Pulse width: 1μs]NAC-16-472(Ferrite core)00 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0Input voltage [kV]Figure 2.11.2 Example of Comparing PulseAttenuation CharacteristicsGround Capacitor CodesNAP-16-472(Amorphous core)V : Pulse voltage [V]T : Pulse width [sec]According to the expression,an EMI filter using aB: Change of core’s magneticcore that has largerBflux density = Bm - Br [T]Bm: Saturation magneticflux densityBr : Residual magneticflux densityN : Number of turns in a coil [turns](for example, an amorphouscore) is less vulnerableto magnetic saturation,assuming that the numbersof turns and the sizes ofcores are the same.Ae: Effective cross section [m 2 ]Many EMI filters can support various capacities ofground capacitors by specifying an appropriate code.The selectable ground capacitor codes depend on thetypes of EMI filters; the following table lists an exampleof ground capacitor codes and attenuation characteristics.Table 2.12.1 Example of Ground Capacitor Codes (EAP series)CodeLeak Current (input 125/250V 60Hz)Line to ground capacitor(nominal value)0005μA/10μA maxNot Provided10112.5μA/25μA max100pF22125μA/50μA max220pF33137.5μA/75μA max330pF47150μA/100μA max470pF68110222233275.5μA0.13 mA0.25 mA0.38 mA////150μA max0.25 mA max0.5 mA max0.75 mA max680pF1000pF2200pF3300pF4720.5mA/1.0 mA max4700pFAttenuation [dB]Figure 2.12.1 Example of Ground Capacitor Codesand Common Attenuation CharacteristicsGenerally, the larger capacity one sets a ground capacitorto, the better the common mode attenuation characteristic.But, the leakage current will also become larger, whichmeans that there is a tradeoff.The abundant selections of ground capacitor capacitiesmake it possible for one to develop the best balancebetween attenuation characteristic and leakage current.13010203040506070EAP series10A Rated article800.010.1110100Frequency [MHz]Options000102222472221471Our EMI filters can be customized by specifying anoption code.As the types of set options depend on filter products,please refer to our catalog.The following describes the outline of each option:a. DIN rail installation type: DThis type of EMI filter can be installed to a DIN railoften used for control consoles, etc.Figure 2.13.1 Examples of DIN Rail InstallationType EMI FiltersNote that as this type of EMI filter may not produceproper noise attenuation with grounding through a DINrail, one must connect the ground to the protective earthterminal (PE) of the EMI filter. For EMI filters that havetwo protective earth terminals, it can connect the groundto either one only.Model NameRated CurrentOptionGround Capacitor CodesEMI/EMCFilter? 767 ?Technical Notes-9