Title One Phase Common Mode Choke in a 50Hz net for suppressing 50kHz current harmonic Input ·         Set  inductance of both in series connected windings at the peak value of the current Ic (Ic = (Ic1 - Ic2)/2  ~ (0.01-0.05) x Iload ·         Set the compensated harmonics of the thermal current .Note that the sign "+" marks the compensated current harmonics. ·         Set the other harmonics of the thermal current which are not compensated without the sign "+". ·         Select the differential inductance : L-Type = 4 ·         Select Cu round wire: Wire = 0 ·         The frequency of the first harmonic is 50Hz ·         Set the Q-factor in order to limit the resistive voltage drop of the compensated current, the temperature rise and the criterion = 0 ·         Select ferrite with a good reverse permeability. ·         Select  suitable core family and the gap positions Output ·         Control the value of inductance ·         Manufacture 2 insulated, full layer windings, each with 50% of the calculated turns. Do not use double section bobbin Test ·         Check the core construction with Gap=0 ·         Set the current in the LI-point higher and Press Ctrl+L to see the diagram Inductance vs. Current Note ·         In order to calibrate the choke, connect both windings in series on the calculated calibration AC-voltage (rms value) with the calibration frequency (normally 50Hz or 60Hz) and then vary the gap until you get the calculated calibration AC-current (rms value).

 Title Three Phase Common Mode Choke with a one phase core in a 50Hz symmetrical net for suppressing 5000Hz unsymmetrical current harmonics Input ·         Set  inductance of three in series connected windings at the peak value of the current 2 x Ico (Ico  ~ (0.01-0.05) x Iload ·         Set the compensated harmonics of the thermal current .Note that the sign "+" marks the compensated current harmonics. ·         Set the other harmonics of the thermal current which are not compensated without the sign "+". ·         Select the differential inductance : L-Type = 4 ·         The frequency of the first harmonic is 50Hz ·         Set the Q-factor in order to limit the resistive voltage drop of the compensated current, the temperature rise and the criterion = 0 ·         Select grain oriented steel. ·         Select  suitable one phase core family and the gap positions Output ·         Control the value of inductance ·         Manufacture 3 insulated, full layer windings, each with 1/3 of the calculated turns. Test ·         Check the core construction with Gap=0 ·         Set the current in the LI-point higher and Press Ctrl+L to see the diagram Inductance vs. Current Note ·         In order to calibrate the choke, connect all windings in series on the calculated calibration AC-voltage (rms value) with the calibration frequency (normally 50Hz or 60Hz) and then vary the gap until you get the calculated calibration AC-current (rms value).

 Title Drainage Choke between 2 rectifiers Input ·         Set  inductance of both windings in series at approx. 5-10% of the nominal current Id/2 ·         Select the differential inductance : L-Type = 4 ·         Select Cu flat wire or foil with layer insulation: Wire = 3 or 6 ·         The frequency of the first harmonic is 150Hz ·         Set the rms values of the harmonics of the thermal current:  Note that the sign "+" marks the compensated current harmonics. ·         Set the temperature rise ·         Select cold rolled steel. ·         Set Gap = 1 and Core Assembly = 2 or better ·         Select  suitable core family (UI) Output ·         Control the value of inductance Test ·         Set the current in the LI-point higher and Press Ctrl+L to see the diagram Inductance vs. Current Note ·         In order to calibrate the choke, connect both in series windings on the calculated calibration AC-voltage (rms value) with the calibration frequency (normally 50Hz or 60Hz) and then vary the gap until you get the calculated calibration AC-current (rms value).

 Title Drainage Choke between 2 phases of inverters Input ·         Set  inductance of both windings in series at approx. 5-10% of the nominal current Iout/2 ·         Select the differential inductance : L-Type = 4 ·         Select Cu flat wire or foil with layer insulation: Wire = 3 or 6 ·         The frequency of the first harmonic is 50Hz ·         Set the rms values of the harmonics of the thermal current:  Note that the sign "+" marks the compensated current harmonics. ·         Set the temperature rise ·         Select cold rolled steel. ·         Set Gap = 1 and Core Assembly = 2 or better ·         Select  suitable core family (UI) Output ·         Control the value of inductance Test ·         Set the current in the LI-point higher and Press Ctrl+L to see the diagram Inductance vs. Current Note ·         In order to calibrate the choke, connect both in series windings on the calculated calibration AC-voltage (rms value) with the calibration frequency (normally 50Hz or 60Hz) and then vary the gap until you get the calculated calibration AC-current (rms value).