High current inductor common mode filtering SQ series Energy storage charging station coil
SQ2820
SQ2820 is a square closed magnetic core flat wire common-mode inductor. It is made by using manganese-zinc ferrite SQ type magnetic core and flat copper wire for winding. It is a mainstream magnetic component for EMI filtering in high-power power supplies and is compatible with vertical or horizontal PCB pin mounting.
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The flat winding has a higher current density, lower DCR and excellent heat dissipation performance. It is specifically designed to suppress common-mode interference on the power line. Its features include a 1:1 symmetrical winding, low leakage flux, strong common-mode suppression effect, and the flat line structure is suitable for high-current scenarios.
Product parameters
| Core Material | PC40 Manganese-Zinc Ferrite | Installation Options | PCB Vertical / Horizontal Pin Options Available |
| Winding Material | Flat Oxygen-Free Copper Strip | Rated Working Voltage | 85~265VAC 50/60Hz |
| Rated Current Range | 3A~10A (Customizable) | Inductance Range | 2mH~20mH, Customizable as Required |
| Inductance Tolerance | ±10% / ±5% Available | Resistance DCR | Low mΩ Level |
| Frame / Base | UL94-V0 Flame Retardant Plastic | Brand | CXWON |
| Operating Temperature | -40℃ ~ +125℃ | Optional Processes | Full Package Malla Tape, Vacuum Immersion Painting, Moisture Protection |
Common models
Core advantages of SQ inductor
1. The SQ closed square magnetic core structure has low leakage flux and strong suppression capability for common-mode noise, making it easier to pass EMC tests.
2. The flat copper wire winding has a much higher current density than traditional round wires, resulting in lower temperature rise under high current conditions.
3. The extremely low DC resistance (DCR) reduces copper loss and improves the overall efficiency of the power supply.
4. The 1:1 symmetrical design of the winding results in small differential-mode imbalance and stable filtering performance.
5. The PC40 ferrite magnetic core has low high-frequency loss and can suppress common-mode interference over a wide frequency range.
2. The flat copper wire winding has a much higher current density than traditional round wires, resulting in lower temperature rise under high current conditions.
3. The extremely low DC resistance (DCR) reduces copper loss and improves the overall efficiency of the power supply.
4. The 1:1 symmetrical design of the winding results in small differential-mode imbalance and stable filtering performance.
5. The PC40 ferrite magnetic core has low high-frequency loss and can suppress common-mode interference over a wide frequency range.
Inductor real-shot details：
Typical application scenarios
Flowchart
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FAQ
Q: What is the maximum rated current supported by the common-mode inductor of SQ2820?
A: The standard version can reach up to 10A. It can be customized by adjusting the thickness and width of the flat wire. According to the temperature rise indicators, the recommended range for regular selection is 3 to 8A.
Q: What are the advantages and disadvantages of the epoxy-coated version of SQ2820?
A: Epoxy coating advantages: reduces coil noise, prevents moisture, and is resistant to vibration, suitable for energy storage and outdoor equipment; disadvantages: the cost slightly increases, and the coil heat dissipation slightly decreases.
Q: What frequencies of EMI filtering is the SQ2820 suitable for?
A: It is mainly for power frequency conducted interference, applicable in the range of dozens of kHz to 30 MHz, to suppress common-mode noise of power lines.
Q: Is the winding of SQ2820 1:1, and can it be made into an asymmetric winding?
A: The standard version is 1:1 symmetrical winding; special schemes can customize asymmetric winding. It is necessary to provide the schematic diagram and current parameter assessment in advance.
Q: What is the difference between the flat wire and the ordinary round wire common-mode inductor of SQ2820?
A: The flat copper tape has a higher filling rate and smaller DCR, resulting in lower temperature rise at high currents; the round wire is suitable for smaller currents. For high-power and projects with strict temperature rise requirements, the SQ flat wire solution is preferred.
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