Magnetic components are used throughout new energy equipment, including EV chargers, solar inverters, energy storage systems and other power conversion equipment.
Transformers, inductors and magnetic filters all have different functions. The right component needs to match the electrical characteristics of the application while maintaining acceptable losses, temperature and reliability.
For new energy equipment, component selection is particularly important because many systems operate at high power and may run continuously.
Start by determining where the magnetic component will be used.
An inductor for a solar inverter does not necessarily have the same requirements as a transformer for an EV charger.
Common applications include:
EV chargers
Solar inverters
Energy storage systems
DC-DC converters
Battery management systems
Industrial power supplies
Understanding the application helps determine the appropriate magnetic structure and specifications.
Power level is one of the first specifications to establish.
High-power applications require magnetic components capable of handling substantial current and energy without excessive losses or temperature rise.
The design should consider continuous power as well as peak power.
A component selected only according to average load may not perform properly when the system reaches its maximum operating condition.
Current capacity is especially important for inductors used in new energy equipment.
High-current inductors need to maintain suitable inductance without excessive saturation.
The winding must also handle the current without creating excessive copper losses.
For high-current designs, manufacturers may use thicker copper wire, multiple parallel conductors or flat copper wire depending on the application.
Switching frequency has a direct effect on magnetic component design.
Higher frequencies can allow smaller magnetic components, but they can also increase core and winding losses.
The core material and winding structure should therefore be selected according to the actual switching frequency.
This is particularly important for high-frequency transformers and inductors used in power conversion systems.
Different magnetic materials have different characteristics.
Ferrite materials are commonly used in high-frequency transformers and inductors, while other magnetic materials may be more suitable for energy storage or lower-frequency applications.
When choosing a core, consider frequency, magnetic flux density, saturation characteristics and core loss.
The physical size of the core alone does not determine whether it is suitable.
Saturation is an important consideration for power inductors.
When the magnetic core approaches saturation, inductance can decrease and current can increase rapidly.
This can create additional stress on switching devices and increase system losses.
For high-current applications, check the inductance-versus-current curve instead of relying only on the nominal inductance value.
Winding resistance contributes to copper loss.
As current increases, even relatively small resistance can result in significant power loss and heat.
Low DCR is therefore desirable for many high-current new energy applications.
However, reducing resistance usually requires larger conductors or more copper, so the winding design needs to balance electrical performance and available space.
New energy equipment may operate at high load for extended periods.
The magnetic component must therefore be able to dissipate the heat generated by core and winding losses.
Check the temperature rise under the actual or expected maximum load.
The surrounding temperature should also be included because the component may be installed inside an enclosed inverter, charger or energy storage system.
Energy efficiency is a major concern in new energy systems.
Every watt lost in a transformer or inductor eventually becomes heat.
Reducing magnetic losses can improve the efficiency of the complete power conversion system and reduce the cooling requirements.
When comparing components, evaluate performance under realistic operating conditions rather than looking only at the best-case efficiency.
Power density is becoming increasingly important in new energy equipment.
EV chargers, solar inverters and energy storage systems often need to provide more power within limited installation space.
A smaller magnetic component can help reduce system size, but reducing dimensions should not compromise thermal performance or reliability.
Core design, winding structure and cooling should be considered together.
Transformers used in new energy equipment may require electrical isolation between different circuits.
Insulation requirements depend on the operating voltage and system architecture.
Check insulation materials, dielectric strength, creepage and clearance according to the requirements of the finished product.
This is especially important in high-voltage applications such as EV charging and energy storage systems.
Power conversion equipment generates switching noise that can affect electromagnetic compatibility.
Common mode chokes and other magnetic filtering components can be used to control unwanted noise.
Transformer and inductor construction can also influence EMI performance through leakage inductance and parasitic capacitance.
The magnetic component should therefore be evaluated as part of the complete power conversion and filtering system.
New energy equipment can be installed in demanding environments.
Depending on the application, magnetic components may be exposed to high temperatures, humidity, vibration or outdoor conditions.
The component's operating temperature range and mechanical construction should match the actual installation environment.
For automotive applications, vibration and temperature cycling can be particularly important.
Standard components may not always provide the required combination of power, current, dimensions and thermal performance.
Custom transformers and inductors can be designed around the specific requirements of the equipment.
The manufacturer can adjust the core material, winding structure, conductor size, air gap, insulation and mechanical dimensions.
This can be useful when designing high-power EV chargers, solar inverters and energy storage equipment.
The manufacturer's production capability is another important factor.
Check whether the supplier has suitable winding equipment, core processing capabilities, automated production and testing equipment.
For high-current magnetic components, the manufacturer should also have experience with large conductors and appropriate winding techniques.
Magnetic components should be tested against the required specifications.
Depending on the application, testing may include inductance, DCR, saturation characteristics, temperature rise, insulation resistance and withstand voltage.
Consistent quality is especially important for new energy products that may be produced in large quantities and expected to operate for many years.
When comparing suppliers, look beyond the quoted price.
Consider engineering experience, magnetic materials, winding technology, testing capabilities, production capacity and quality control.
A supplier with experience in EV charging, solar power, energy storage or other power electronics applications may be better equipped to handle application-specific requirements.
The right magnetic component depends on the complete electrical and mechanical requirements of the new energy system.
Power, current, frequency, core material, saturation, DCR, temperature, insulation, size and EMI performance all need to be considered together.
For demanding applications, custom magnetic components can provide a better fit than standard products, particularly when the equipment requires high power density, high efficiency or long-term operation.
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