TITLE:
Design and Analysis of an Integrated Hybrid AC/DC Generator with Built-In Rectification as an Alternative to Conventional DC Generator Systems
AUTHORS:
Laiqat Ali Khan
KEYWORDS:
Hybrid AC/DC Generator, Brushless Synchronous Generator, Built-In Rectification, Integrated Generator-Converter System, DC Power Systems, Telecommunications Power Supply, −48 V DC, Power Electronics, Voltage Regulation, Embedded Rectifier
JOURNAL NAME:
Open Journal of Energy Efficiency,
Vol.15 No.3,
August
18,
2026
ABSTRACT: Conventional direct current (DC) power systems for telecommunications and other DC-intensive applications typically employ a three-phase alternating current (AC) generator together with an external rectification cabinet to produce the regulated −48 V DC supply required by communication equipment. Although this architecture is widely adopted and highly reliable, it increases equipment footprint, installation complexity, transportation requirements, cabling, deployment time, and maintenance. Conventional DC generators provide direct DC output through mechanical commutation; however, their reliance on brushes and commutators introduces mechanical wear, sparking, increased maintenance, and reduced operational reliability. This paper proposes an integrated hybrid AC/DC generator architecture that combines a commercial brushless synchronous AC generator with an embedded DC rectification system within a single generator enclosure. The proposed design incorporates a three-phase bridge rectifier, filtering stage, voltage regulation, protection circuitry, and optional DC-DC conversion to deliver regulated −48 V DC while simultaneously retaining the capability to supply conventional AC power. The work does not introduce a new electrical machine or a new rectifier topology; instead, it presents a system-level integration of two mature technologies to eliminate the need for a separate external telecom rectification cabinet. The proposed architecture is evaluated through analytical modelling, electrical machine theory, representative design calculations, and circuit-level analysis. Performance metrics including DC output voltage, voltage regulation, ripple characteristics, efficiency, thermal management, and protection requirements are examined and compared with those of conventional commutator-based DC generators. The reported performance values represent predicted behavior under the stated design assumptions and are intended to demonstrate the engineering feasibility of the proposed architecture rather than experimental validation. The proposed integrated hybrid AC/DC generator is expected to reduce installation complexity, equipment footprint, deployment time, and maintenance while preserving the reliability and operational advantages of modern brushless alternator technology. The architecture is particularly suited to telecommunications, emergency communication systems, disaster recovery, military field operations, remote industrial facilities, and other applications requiring compact and reliable simultaneous AC and regulated DC power from a single generator platform [1].