Automation systems now play a central role across manufacturing, logistics and infrastructure. Whether used in robotic cells or distributed control systems, performance depends on consistent and well-managed power architecture.
In automation, the choice between AC and DC power supplies remains a key design decision. In practice, most automation systems rely on both. The real challenge lies in how effectively power is converted, distributed and controlled across the application.
Why this matters in 2026
Automation design continues to evolve, with systems becoming more compact and increasingly interconnected. Expectations around efficiency, uptime and compliance have increased.
It involves working with distributed control architectures, which feature high-density control panels, sensitive electronics requiring that require stable voltage, and systems expected to operate continuously.
These factors place greater emphasis on defining the power strategy early in the design process.
Understanding AC and DC in Automation
AC power is typically supplied from the mains and used as the primary input in industrial systems.
DC power is required by control and electronic components, including PLCs, sensors, communication modules, and embedded controllers.
As a result, AC/DC conversion is usually the first stage in mains-powered systems, followed by DC/DC conversion where different voltage levels or isolation requirements must be addressed.
AC/DC Power Supplies in Practice
AC/DC power supplies convert mains input into a stable DC output for system-level distribution.
In industrial automation, these units are commonly installed within control cabinets or mounted on DIN rails. Selection is typically based on:
- Input voltage range
- Thermal performance within the enclosure
- Efficiency under varying load conditions
- Compliance with safety and EMC standards
Enclosed, DIN rail and chassis mount designs are widely used, depending on environmental conditions, available space and cooling requirements.
DC/DC conversion within the System
Once DC power has been established, DC/DC converters regulate, step, or isolate voltage levels for specific subsystems.
They are widely used across control boards, communication modules, and isolated circuits, where voltage stability and noise control directly affect performance.
PCB mount DC/DC converters support compact layouts and maintain consistent electrical performance across sensitive components.
Common design challenges
Challenges often arise when power supply selection is delayed. This can lead to issues with thermal constraints within enclosures, or challenges meeting EMC compliance; it may also result in additional filtering requirements and layout limitations.
Addressing these issues late in the design cycle increases development time and complexity.
Early specification as a design approach
Treating the power supply as part of the initial system architecture supports better alignment with performance and compliance.
As automation systems advance, careful consideration of power supply design remains essential for reliable and predictable performance.
