Efficient Noise Suppression – VACOCOIL Improved Attenuation at High Frequency
Common Mode Chokes (CMCs) with the patented VACOCOIL design offer improved attenuation at high frequency (f > 1 MHz) compared to standard designs.
Benefits:
- High current common mode choke in most compact design
- Cost-optimized solution
- 10x improved impedance compared to standard design (@10 MHz)
Reduction of winding capacitance with innovative winding technology
VAC’s new VACOCOIL technology enables a new solution for the winding of a high power CMC (load currents > 50 A). Until now, parallel copper wires have been used as standard for high currents. However, this leads to high parasitic winding capacitances and therefore lower attenuation in the high frequency range. With the introduction of VACOCOIL technology, a solid copper conductor replaces the parallel copper wires. This results in lower winding capacitance and improved attenuation, typically in the > 1 MHz range.
An example is shown in below figure. A CMC with three parallel copper wires (3x Ø 3 mm, blue curve) is compared to a CMC with VACOCOIL technology (1x Ø 4.5 mm, red curve). There is no difference in the toroidal core used. Due to the significantly reduced winding capacitance of the VACOCOIL technology, the impedance in the frequency range > 1 MHz is significantly higher. In addition to the significantly better attenuation, VACOCOIL technology represents a cost-optimized and often more compact solution compared to the standard solution.
Reduction of winding capacitance with innovative winding technology
VAC’s new VACOCOIL technology enables a new solution for the winding of a high power CMC (load currents > 50 A). Until now, parallel copper wires have been used as standard for high currents. However, this leads to high parasitic winding capacitances and therefore lower attenuation in the high frequency range. With the introduction of VACOCOIL technology, a solid copper conductor replaces the parallel copper wires. This results in lower winding capacitance and improved attenuation, typically in the > 1 MHz range.
An example is shown in below figure. A CMC with three parallel copper wires (3x Ø 3 mm, blue curve) is compared to a CMC with VACOCOIL technology (1x Ø 4.5 mm, red curve). There is no difference in the toroidal core used. Due to the significantly reduced winding capacitance of the VACOCOIL technology, the impedance in the frequency range > 1 MHz is significantly higher. In addition to the significantly better attenuation, VACOCOIL technology represents a cost-optimized and often more compact solution compared to the standard solution.
List of Standard VACOCOIL Common Mode Chokes
| Product | Download |
IN [A] |
Number of Windings |
UN OVCat III [V] |
UN OVCat II [V] |
Grade | Design |
LN 10 kHz [mH] |
LN 100 kHz [mH] |
RCU [mΩ] |
|Z| 100 kHz [Ω] |
fR [MHz] |
Icm 10 kHz [mA] |
Length [mm] |
Height [mm] |
Width [mm] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6109-X004 * | 120 | 2 | 1000 | 1500 | Industry | Low profile | 1.52 | 1.26 | 0.44 | 870 | 3 | 700 | 91.6 | 42.5 | 91.6 | |
| 6109-X005 * | 120 | 3 | 1000 | 1500 | Industry | Low profile | 1.21 | 0.77 | 0.44 | 598 | 5 | 700 | 91.6 | 42.5 | 91.6 | |
| 6109-X006 * | 120 | 4 | 1000 | 1500 | Industry | Low profile | 0.85 | 0.46 | 0.44 | 383 | 6 | 500 | 91.6 | 42.5 | 91.6 |
* Types marked with an asterisk (*) are currently available as prototype samples only.
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