The evolution of smart cities and homes relies heavily on advanced energy-saving solutions and control technologies. Meeting the narrowband design needs of modern telecommunication systems is seen as an important element in the smart cities transformation process. That means that designers will look to power line transformers to take a leading role in satisfying these requirements. This blog examines the changing landscape of power distribution grids, and the benefits of Power Line Communication (PLC) technology.  It also presents the features in Bourns® PFB Series PLC transformers that make these components a cost-effective solution for narrowband requirements in the latest PLC-based systems.

Benefits of Power Line Communication Infrastructure

Traditional power grids, once characterized by centralized power distribution, are undergoing significant changes with the integration of renewable energy sources. As more consumers generate their own power through sources like solar panels, the grid is shifting towards decentralization. This shift presents challenges, including the need for a more intelligent and robust system, commonly known as the ‘smart grid’. PLC technology is used by smart grid systems to enable real-time communication and helps to rapidly detect localized power outages when used in smart meters.

PLC technology utilizes existing power line infrastructure for seamless data transfer, making it a reliable and cost-effective choice for smart grids. Unlike wireless alternatives, PLC communication faces fewer issues related to cost, security, coverage, and latency. Bourns addresses this demand for narrowband PLC technology through its PFB Series transformers which feature advanced galvanic isolation specifically designed to meet smart energy infrastructure requirements.

Designing Galvanic Isolation for Line Coupling Circuits

In a recent application note, Bourns engineers outlined a straightforward approach to designing galvanic isolation. Bourns® PFB Series PLC transformers offer a solution for line coupling circuits, providing galvanic isolation to separate AC mains and PLC signals. These transformers are designed for both long-distance rural and urban applications, operating at transmission frequencies less than 500 kHz.

The application note also highlights the addition of using the Bourns® GMOV™ circuit protection component into the PLC coupling circuit design. With its low capacitance to minimize speed interference, the Bourns® GMOV™ protector serves as an ideal solution for applications requiring very low leakage to help decrease energy waste.

PLC Smart Meter Line Coupling Application Example

To emphasize the value of using Bourns® PFB Series transformers, the application note uses a PLC smart meter application as a helpful example. The example illustrates that the electrical parameters of the PFB Series transformers align with the design steps outlined for effective isolation in PLC coupling circuits. It also lists the specific GMOV™ protector model that is recommended based on the PLC system voltage so as to ensure superior protection against transients or surges.

Of interest to designers, these transformers are available in standard and elongated forms, and are qualified with STMicroelectronics® ST8500 programmable PLC modem SoC and STLD1 Line Driver. Plus, they offer reinforced insulation for added safety, protecting against electric shock and isolating users from hazardous input voltages.

In conclusion, PLC technology is a cornerstone for smart energy infrastructure applications due to its reliability, real-time measurements, and cost-effectiveness. Bourns® PFB Series PLC transformers are tailored to meet the isolation requirements in PLC line coupling circuits and are designed to meet narrowband PLC coupling circuit requirements in applications such as smart meters and automation equipment. The inclusion of the GMOV™ hybrid protection component into the design provides an additional robust protection and low capacitance solution to thwart unexpected transients or surges.

Bourns remains committed to aiding the evolution of smart energy solutions with its innovative and reliable component technologies. To that end, this application note has provided a helpful streamlined design process for incorporating isolation into coupling circuits, emphasizing the importance of selecting transformers with advanced features.