Basic Architecture of Communication Power Supply System

A communication power supply system typically consists of AC input sources, rectifiers, DC distribution, backup batteries, and power management units to ensure reliable and uninterrupted operation of telecom equipment. Core Components1.

A

C Input and Rectifiers Telecom sites usually receive power from the national electricity grid.

The A

C power is converted to a stable DC voltage, commonly –48 V DC, using rectifiers. This negative DC voltage is chosen for safety, reduced corrosion, and compatibility with lead-acid battery backup systems. Redundant rectifiers are often deployed to ensure continuous operation even if one unit fails.

2.

D

C Distribution and Power Distribution Units (PDUs) The rectified DC power is distributed to telecom equipment such as routers, switches, base transceiver stations (BTS), and remote radio heads (RRH) via PDUs.

PD

Us manage load distribution, provide surge protection, and allow remote monitoring and control, ensuring stable operation across the network. 3. Backup Batteries Batteries, typically 12 V lead-acid cells connected in series, provide temporary power during grid outages.

They float-charge from the rectifiers and supply –48 V DC to the equipment if the primary power fails. This setup effectively creates an uninterruptible power supply (UPS) for critical telecom loads. 4.

Generators and Automatic Transfer Switches (ATS) For extended outages, diesel generators automatically start to supply AC power.

The AT

S synchronizes generator output with the grid and rectifiers, ensuring seamless transition and continuous DC power to the telecom equipment. 5.

Intermediate Bus and Point-of-

Load (POL) Converters High-density telecom equipment often requires multiple low-voltage supplies. The –48 V DC is converted to intermediate bus voltages (e.g., +12 V) and further stepped down using POL converters to supply analog and digital circuits efficiently. Modern designs may use cascaded or hybrid isolated converters to optimize efficiency and reduce PCB complexity.

System Design Considerations

Redundancy (N+1): Ensures that if one power module fails, others maintain the load without interruption. Environmental Protection: Temperature, humidity, and surge protection are critical for reliability. Monitoring and Control: Remote management allows operators to track power usage, detect faults, and implement corrective actions proactively.

Scalability: Modular designs allow expansion to meet growing network demands, especially in 5G and high-density deployments.

Summary

The basic architecture of a communication power supply system integrates AC input, rectification, DC distribution, backup batteries, generators, and advanced power management to ensure uninterrupted, reliable power for telecom networks. This architecture supports redundancy, efficiency, and scalability, making it essential for modern communication infrastructure.