Choosing Inductors for Inverters: Key Considerations.

In photovoltaic systems, the use of inverters is fundamental. However, it is equally important to protect the inverter and the entire system from disturbances that may originate from the power grid. One effective way to achieve this is by integrating an inductor. This solution helps filter disturbances and ensures the stable and safe operation of the photovoltaic system. In this article, we will explore the various factors to consider when selecting inductors for inverters, taking into account aspects such as voltage, frequency, and project specifications.

When choosing an inductor for an inverter, the nominal voltage is one of the first factors to evaluate. It is crucial to ensure that the inductor does not face overload or overheating. To provide an adequate safety margin, the nominal voltage of the inductor should be slightly higher than the output voltage of the inverter. This precaution helps prevent operational issues and increases the component's lifespan.

Another essential parameter in selecting an inductor is the operating frequency. Inverters operate at various frequencies, and the inductor must be designed to function correctly at the specific frequency in use. It is important to choose an inductance value that matches the inverter's operating frequency. An inappropriate inductance value can compromise inverter performance, negatively impacting the system's efficiency and stability.

The design specifications of the inverter directly influence the choice of the inductor. For instance, the load current is a critical aspect to consider: the inductor must handle the expected current without saturating. Inductor saturation could cause malfunctions and damage the system. Furthermore, the physical dimensions of the inductor must be compatible with the inverter circuit's layout. The inductor must be small enough to fit into the circuit without issues, yet large enough to dissipate the generated heat.

The quality of the materials used to construct the inductor is another significant factor to consider. Our inductors are all made in Italyt and built with high-quality magnetic materials and robust windings, ensuring greater durability and stable performance over time. Investing in high-quality inductors can reduce the need for maintenance and replacement in the long term, contributing to improved overall system reliability.



Choosing inductors for inverters requires careful and thoughtful consideration of various factors. By taking into account the nominal voltage, operating frequency, design specifications, and material quality, we can help you select the most suitable inductor for your application to ensure proper operation and efficiency of your inverter. A well-considered and carefully made choice can significantly contribute to the system's long-term stability and reliability.

Toroidal Transformers vs. Traditional Transformers: a detailed comparison.

In the world of electrical systems and electronics, selecting the right transformer is crucial to ensure efficiency and safety. Two of the most common types of transformers are toroidal transformers and traditional (laminated core) transformers. In this article, we provide a detailed comparison of these two technologies, analyzing their advantages, disadvantages, and typical applications.

Toroidal transformers are electronic devices characterized by a magnetic core in the shape of a toroid (ring). This configuration offers several advantages over traditional transformers, including higher efficiency and reduced electromagnetic interference (EMI). Toroidal transformers are often used in applications where space and signal quality are critical.

Traditional transformers, often known as laminated core transformers, consist of a core made of silicon steel laminations stacked to form an E- or U-shaped structure. These transformers are widely used for their robustness and reliability. Thanks to their simple and proven design, traditional transformers are broadly employed in many applications. However, they have some limitations, such as relatively bulky dimensions and magnetic losses occurring at the junctions between the laminations.

Below, we detail the advantages of each configuration:

Advantages of Toroidal Transformers:

1. Energy Efficiency: Toroidal transformers have lower magnetic flux leakage, leading to higher efficiency for the same power output.
2. Compact Size: The toroidal shape allows for more compact designs, saving space in devices.
3. Reduced Electromagnetic Interference (EMI): The toroidal configuration minimizes EMI emissions, enhancing signal quality.
4. Lower Hum: Toroidal transformers produce less acoustic noise compared to traditional transformers.



Advantages of Traditional Transformers:

1. Robustness: Laminated core transformers are known for their durability and resistance to demanding operating conditions.
2. Lower Cost: For the same power output, traditional transformers tend to be more cost-effective due to their standardized design.
3. Wide Availability: Traditional transformers are widely available and used in many standard applications.
4. Lower Inrush Currents: Unlike toroidal transformers, which may experience high inrush currents at startup (increasing with power), traditional transformers do not face this issue.

Motor Starting  Reactors: Benefits, Applications, and Practical Advices.

Motor starting reactors are essential components in industrial systems and electrical applications. These devices help reduce inrush currents, thereby extending the lifespan of motors and enhancing the overall safety of the system. In this article, we will explore the benefits of motor starting reactors, their main applications, and provide practical advice on how to select the right reactor for your needs.

One of the main advantages of motor starting reactors is their ability to reduce inrush currents. When a motor starts, the initial current can be up to ten times higher than the nominal current. This high current can damage motor components and the electrical system. Reactors limit this initial current, reducing stress on components and increasing the motor's longevity.

In addition to reducing inrush currents, motor starting reactors also enhance system stability. By minimizing current peaks and line imbalances, voltage fluctuations are reduced, ensuring smoother and more reliable motor operations. This leads to significant savings in electricity costs. This is particularly important in industrial applications where system stability is critical to avoid interruptions and failures.

Motor starting reactors are used in a wide range of industrial and commercial applications, including:

• Pumping Systems: Reactors are employed to start electric pumps, reducing component wear and improving operational efficiency.
• Compressors: In air compression systems, reactors help avoid current peaks that could damage compressors and electrical circuits.
• Conveyor Belts: In industrial transport systems, reactors ensure a gradual and controlled start, preventing overloads and equipment damage.
• Large Industrial Motors: Reactors are used to start high-power motors in applications such as fans, mills, and machine tools, ensuring safe and reliable operation.

When choosing a motor starting reactor, several factors should be considered to ensure proper selection. Here are some practical tips:



• Assess the Inrush Current: Ensure the reactor is correctly sized to handle the expected inrush current for the motor. A reactor that is too small might be ineffective, while one that is too large could lead to excessive costs.
• Consider the Motor Type: Different types of motors may require specific reactors. Check the motor specifications and manufacturer recommendations to determine the most suitable reactor.
• Evaluate Available Space: The physical dimensions of the reactor are important for smooth installation. Ensure there is sufficient space to mount the reactor within the system without issues and to guarantee regular operation.

In conclusion, motor starting reactors are essential components for improving the efficiency and safety of motorized systems. By reducing inrush currents and enhancing system stability, reactors contribute to extending motor lifespan and reducing failure risks. Carefully considering the benefits, applications, and practical advice provided in this article will help you select the right reactor for your needs and optimize your motor performance. If you need further technical support, write to us at info@svtsas.it.

Our reactors are exclusively made in Italy with high-quality, reliable, and certified components.

Is it always possible to convert three-phase voltage to single-phase voltage?

It often happens that there is a need to convert from three-phase power supply voltage to single-phase voltage. Is it always possible?

The answer is yes, and there are multiple solutions available. One of the most economical options is to use a three-phase transformer, supplied with 400V three-phase at the input, and outputting 230V between one of the phases and the neutral. It should be noted that with this type of electromechanical solution, the system will always be unbalanced—one phase will be loaded twice as much as the other two. Therefore, if the need is to have a balanced output load, the balancing must be achieved electronically through PLC. It is not possible to balance the system even by using three single-phase transformers connected in a delta or star configuration instead of the three-phase transformer. In fact, such a solution is characterized by lower efficiency and higher weight compared to using a single three-phase transformer.

Can an Autotransformer Be Used in This Case?

No, an autotransformer can only be used when there is a need for a voltage change, but within a system that is either three-phase to three-phase or single-phase to single-phase—not in mixed solutions that combine the two.



How Can You Convert Single-Phase Voltage to Three-Phase Voltage?

Single-phase = one phase; three-phase = three distinct phases. It is not possible to "create" three distinct phases from a single phase.

How to reduce the size and bulk of electrical transformers?

Electrical transformers are static machines that operate in alternating current and are based on the phenomenon of electromagnetic induction. They are essential in most of the electronic devices we use because they allow voltage transformation to ensure the proper functioning of household appliances and machinery used in our daily work.

Transformers can also be classified based on their size. For instance, we have mega transformers (1,000 MVA), large transformers (up to 2 MVA), network transformers (up to 1,600 kVA), and small transformers (up to 16 kVA).

Is it always possible to reduce the size and weight of electrical transformers?

The answer depends primarily on the operating frequency. If the operating frequency is 50/60 Hz, the only way to try to reduce size and weight is to use toroidal transformers instead of traditional laminated-core transformers.

On the other hand, if there is the possibility of operating at a higher frequency, then the higher the operating frequency, the smaller the windings that can be used. However, the higher the operating frequency, the greater the need for more advanced ferromagnetic cores (such as iron powder materials, Kool Mu, and Mu-metal). Additionally, the electromagnetic compatibility issues become more significant as the operating frequency increases.