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).