The Benefits of Using Shielded Coupled Inductor

SEPIC

A SEPIC (Single-Ended Primary Inductance Converter) is particularly suitable for battery-powered devices or automotive applications. It provides a constant non-inverted output voltage that can be above or below the input voltage. This allows battery voltage fluctuations and different load scenarios to be compensated. This is possible because the SEPIC technology combines a boost and buck converter. Another significant advantage of this circuit topology is a constant input current, which in combination with the input filter consisting of C1 and L1 results in a considerably lower conducted interference. Using a coupled inductor can significantly reduce ripple current load and thus core losses. Although the coupling capacitor C2 provides some isolation between input and output, SEPIC is one of the non-isolated topologies.

Click here to get more.

ZETA

ZETA is another multiwinding converter topology which offers basically a similar functionality than a SEPIC. Both power converters are able to step up and down the input voltage and generate a stable non-inverting output voltage. Another similarity is the DC transfer function VOUT = VIN x D/(1-D). Due to the slightly rearranged circuit configuration with L2 and C3 at the output ZETA converters providing a continuous output current with a low ripple. Unlike a real buck-boost, ZETA converters just require one buck controller IC directly driving a MOSFET. The output is not isolated from the input.

CuK

CuK converters have like SEPIC and ZETA topologies the ability to regulate a voltage that is above or below the input voltage. A special feature, required by some applications, is an inverted output voltage. A major benefit from an EMI point of view  is the continuous current flow in combination with the LC filters on both the input and output side of the converter. This provides a stable current drain from the battery and is significantly minimizing the ripple current. The output is not isolated from the input.

Flyback

Flyback converters are among the most commonly used topologies in industrial electronics and lower power automotive applications. They are extremely popular due to the relatively simple and thus cost-effective design of this circuit topology, which requires only a few components. The coupled inductor serves as a storage choke and also provides galvanic isolation between input and output. The energy transfer takes place during the off-time of the MOSFET. This topology can generate non-inverted output voltages far below or above the input voltage. Depending on the converter's isolation requirements or the safety standard applicable to the particular application, either a coupled inductor with a functional isolation of up to 500 V or a transformer can be used. Another special feature of flyback converters is the ability to generate multiple output voltages. A disadvantage of this topology are the high voltage peaks generated by the switching transistor. This can make an EMC filter necessary at the converter's input to suppress the conducted interference that occurs.

Multi-Output Buck

Coupled inductors can be also used to create an auxiliary or a second output voltage respectively by only using a single buck regulator. This can help to reduce the complexity of the circuits and thus save costs and space on the board.

A coupled inductor is a type of inductor that consists of two or more inductors wound on a common core, allowing them to share magnetic fields. This design enhances energy transfer between the inductors, making coupled inductors essential in various applications where efficient energy management is crucial. At Mentech, we focus on providing high-quality coupled inductors, including common mode chokes and POE transformers, designed to optimize performance in electronic systems. Understanding the characteristics and advantages of coupled inductors helps businesses leverage them for improved functionality.

Diverse Applications of Coupled Inductors

YuYang Magnetic Product Page

Coupled inductors are widely used in power supply systems, where they help regulate voltage and improve energy efficiency. They are particularly effective in DC-DC converters and other switching power supplies, where efficient energy transfer is critical. The use of coupled inductors in POE transformers allows for seamless integration of power and data transmission, enhancing the functionality of modern communication devices. Furthermore, our common mode chokes are designed to reduce electromagnetic interference (EMI), ensuring stable operation in sensitive electronic environments. By incorporating coupled inductors, businesses can significantly enhance the performance and reliability of their electrical systems.

Mentech's Chip Inductors for Signal Integrity

Mentech's chip inductors ensure the signal integrity required for IEEE 802.3 applications, with both inductive and capacitive options available. They support maximum data rates of up to 10G for IEEE 802.3 and can handle POE applications up to 90W. Their small size and low-profile, surface-mount design make them ideal for modern electronic devices, while their excellent noise suppression performance enhances overall system reliability. Understanding these components is essential for businesses that prioritize high-performance networking solutions.

Explore More with Our Inductor Product Line

See related components in our inductor product line, including our molding inductors. These inductors feature a magnetic shielding structure with a closed magnetic circuit, ensuring strong resistance to electromagnetic interference and ultra-low buzzing noise. Their compact size makes them versatile for various applications, while high current performance is maintained even under high-frequency and high-temperature conditions. With low resistance and a robust structure, our molding inductors comply with AEC-Q200 standards, making them reliable choices for businesses seeking efficient and durable solutions in their electronic systems.

Conclusion

Are you interested in learning more about Shielded Coupled Inductor? Contact us today to secure an expert consultation!