Active PFC Power Supplies for Industry 4.0 Automation

Active PFC power supplies play a critical role in improving power quality in modern industrial automation systems. By reducing Total Harmonic Distortion (THD) and stabilizing input current, these power solutions ensure reliable operation in Industry 4.0 manufacturing environments.

In the competitive landscape of modern manufacturing, electrical reliability is the foundation of productivity. As facilities transition toward Industry 4.0, the integration of sophisticated robotics, high-speed sensors, and complex motor drives has fundamentally changed the nature of factory power grids. While these systems provide unprecedented precision, they also introduce a significant challenge: “dirty power” characterized by high Total Harmonic Distortion (THD).

For the design engineer, managing power quality is no longer just a regulatory checkbox—it is a critical strategy for preventing downtime. Choosing a power supply with Active Power Factor Correction (PFC) is one of the most effective ways to protect sensitive automation electronics from the invisible interference generated by non-linear loads. At Horizon PSS, we specialize in providing high-performance power solutions, both self-manufactured and through our strategic partnerships, that stabilize demanding industrial environments.

Choosing a power factor correction power supply such as DRS-3600 36W is one of the most effective ways to protect sensitive automation electronics from interference generated by non-linear loads.

The Problem: “Dirty Power” and Harmonic Distortion

Most standard power supplies without correction draw electricity from the grid in sharp, uneven pulses rather than smooth waves. This non linear draw creates harmonics currents at frequencies that are multiples of the 50Hz or 60Hz fundamental line frequency.

For engineers, high THD can lead to several operational problems:

System Glitches
High-frequency noise can cause “ghost” errors in PLCs, erratic sensor readings, and communication failures between networked devices.

Excessive Heat
Harmonics increase the RMS current, causing cables, circuit breakers, and transformers to overheat even when the actual workload remains unchanged.

Nuisance Tripping
Harmonic currents can trigger protective relays unexpectedly, leading to costly and unplanned production halts.

The Solution: What is Active PFC?

Active Power Factor Correction (PFC) is an electronic stage, typically a boost converter, built into the power supply’s input. It actively shapes the input current so it follows the voltage in a clean, sinusoidal wave. This results in a Power Factor (PF) close to 1.0 (Unity Power Factor), making the supply appear to the grid as a simple, efficient resistive load.

Why Active PFC is Superior to Passive Solutions

While passive PFC uses heavy, bulky inductors to “mask” harmonics, Horizon’s Active PFC units offer a more sophisticated approach:

• Universal Input: Our power supplies operate seamlessly from 90 V to 264 VAC, allowing equipment manufacturers to design machines ready for global deployment without manual voltage selector switches.
• Superior Efficiency: Active circuits significantly reduce energy losses, helping keep both the power supply and control cabinet cooler.
• Compact Form Factor: Because Active PFC circuits operate at higher switching frequencies, their components are smaller. This enables slim DIN-rail designs, ideal for modern high-density control cabinets where every millimeter of rail space matters.

Maintaining stable industrial power quality is essential for reliable operation of robotics, PLC controllers, and sensors in modern automation systems.

Comparison: Choosing the Right Architecture

Meeting the Standard: IEC/EN 61000 3 2

For manufacturers targeting global markets, compliance is not optional. The IEC/EN 61000-3-2 standard limits the harmonic currents that electronic devices can inject back into the public power grid.

By integrating Horizon PSS Active PFC power supplies, engineers can meet IEC/EN 61000-3-2 harmonic compliance requirements directly within their system design, simplifying CE certification and reducing the need for external filtering.

Product Spotlight: Powering Industry 4.0

At Horizon PSS, we distribute and manufacture solutions designed for the most demanding industrial environments.

• Industrial DIN-Rail Power Supplies with Active PFC
  High-efficiency solutions designed for industrial automation environments, offering wide input voltage ranges, high reliability, and compact DIN-rail form factors for modern control cabinets.
• High Density Chassis Mounts: For high-wattage applications where SWaP (Size, Weight, and Power) constraints are critical, our solutions deliver maximum output power with a minimal thermal footprint.
• Green Energy Ready: Our high-efficiency designs reduce standby losses and heat dissipation, helping manufacturers support sustainability goals while lowering operational costs.

Engineering FAQ: Power Quality in Automation

Q: How does Active PFC help with “Ride Through” or Brownouts?

A: Active PFC stages function as an internal energy reservoir. Our power supplies typically provide a hold-up time greater than 20 ms, allowing PLCs and critical controllers to remain powered during brief voltage dips that would otherwise trigger system resets.

Q: Does a higher power factor reduce electricity costs?

A: Yes. While residential users are typically billed only for real power (watts), industrial facilities are often penalized for poor power factor. A higher PF also reduces RMS current, allowing engineers to use smaller wire gauges and smaller circuit breakers in control cabinets.

Q: Is Active PFC necessary for power supplies under 75?

A: Although IEC standards are less strict for units under 75 W, Horizon PSS often recommends PFC even at these power levels in precision laboratory and automated test environments, where low-level electrical interference can affect sensitive measurements.

The Horizon Edge

Reliability in factory automation begins at the power inlet. By choosing Active PFC power solutions from Horizon PSS, engineers can ensure that their Industry 4.0 smart factories are protected from the hidden risks of poor power quality.