Application principle and example content sharing of nanocrystalline common mode inductor core

1. Variable-frequency Drive Device

The frequency converter is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply. The inverter is mainly composed of rectification (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit, micro-processing unit and so on. The frequency converter adjusts the voltage and frequency of the output power supply by switching on and off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. With the continuous improvement of industrial automation, frequency conversion The device has also been widely used. The low magnetic permeability nanocrystalline large common mode inductor core is suitable for low voltage inverters of ≤1000V, which can effectively suppress the common mode interference generated by the inverter.

2. Photovoltaic inverter (PV Inverter)

Suitable for 500kW, 1MW high-power centralized photovoltaic inverters. High permeability and large common mode inductance iron core is suitable for high-power photovoltaic inverter AC side EMC filtering, using the high inductance of the iron core can effectively reduce the number of iron cores to achieve a good filtering effect; low permeability and large common mode inductance The iron core is suitable for EMC filtering on the DC side of high-power photovoltaic inverters. This type of iron core has good inductance frequency characteristics, can effectively resist unbalanced DC components, and avoid burnout caused by iron core saturation.

3. Wind power converter

Suitable for 1MW, 1.5MW, 2MW, 3MW and other direct drive and double-fed converters. Single-turn chokes assembled by stacking several nanocrystalline iron cores are an effective solution to bearing current problems, as well as large current disturbances (peak values ​​ranging from tens to more than 100 amps) generated by wind power generation, large-scale variable speed drives, and other applications. ) is an effective solution to the problem of ultra-high common-mode noise. These problems usually manifest themselves in the form of high-frequency spike currents. Common-mode components produced by Antai Technology Co., Ltd. can be easily and safely integrated into these existing fields to solve the problems that arise. Common mode components can be assembled from two different inner diameter magnetic rings. The components are custom designed according to the required saturation current and inductance, allowing a single selection of magnetic rings, and can also be assembled in several pieces (up to 7 pieces).

4. Electric Vehicles/Hybrid Vehicles

Nanocrystalline common mode inductors are increasingly used in on-board chargers for pure electric vehicles and hybrid electric vehicles. When the temperature is as high as 180°C, the nanocrystalline core can operate safely and for a long time; limited by its application temperature range of ~100°C, the ferrite core cannot meet the usage requirements.

5. Gas-insulated switchgear

Gas-insulated switchgear (GIS) is a component of a very reliable power transmission network. In the past few years, the system voltage has reached 1.2 kV. The switching operation of the GIS can cause dangerous voltage transients (VFTO). A single-turn reactor with a concentrically mounted nanocrystalline core on the inner conductor can effectively suppress these damaging high-frequency (~15 MHz) voltages. Other core materials such as ferrite do not solve this problem.

6. High-energy particle accelerator

Since nanocrystals have a high saturation magnetic flux density of at least 1.2 Tesla, a suitable nanocrystalline iron core is a solution for synchrocyclotron cavity tuning components. Particle beam deflection concentrators or concentrators in very limited spaces, by using nanocrystalline iron cores, typically require a 50% reduction in length compared to ferrite iron cores, but the disadvantage is a significant increase in power consumption during operation. However, due to their low impedance, nanocrystalline iron cores also avoid adverse interactions with the ion beam, and as a result, nanocrystalline iron cores are used in several particle beam accelerator facilities around the world.