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1-STEP AC-DC Power Conversion

1-STEP AC-DC Power Conversion Solution

Our patented 1-STEP technology is revolutionizing power conversion with an innovative circuit solution that uniquely achieves 3-phase active power factor correction, power regulation and electrical isolation in a single conversion step.   

Engineered to deliver improved conversion efficiency and power density in a simplified topology, 1-STEP ac-do converter solution reduces weight, size, cost, complexity and risk for mission-critical applications. 

1-STEP can be scaled up in parallel to meet any output need such as those required by high-power systems found in next-generation military and commercial aerospace platforms.  

PS2600: 1-STEP AC-DC Power Converter
  • Rated at 2,600W (9.6A) output power
  • 3-phase, 400 Hz aircraft power to regulated & isolated 270 VDC output
  • Unity power factor
  • Less than 2% total harmonic distortion
  • Programmable soft start
  • Low in-rush current
PS1500: 1-STEP AC-DC Power Converter
  • Rated at 1,500W (5.5A) steady state with overload to 3 kW for 3 minutes
  • 3-phase, 400 Hz to a regulated and isolated 270 VDC
  • Short circuit protection
  • Stiff dynamic load response
  • Soft start
  • Low output voltage ripple of 0.4%
  • Low weight at 2.4 lbs
See How 1-STEP Compares to Conventional Conversion Methods:
Abstract: Three Phase Active Power Factor Correction in a Single Step

Isolated, Regulated DC Output in One Conversion Reduces Cost, Complexity and Risk

Invented by: Joseph F. Youssef, Senior Electrical Engineer, Marotta Controls

By converting three phase AC power to DC voltage for ready use in military and industrial applications, today’s advanced power electronics circuitry is enabling the replacement of mechanical, pneumatic and hydraulic systems in mission-critical settings.  The resulting improvements is Size, Weight, Power, and Cost (SWaP-C) are driving advancements in military platforms, shipboard systems and commercial aircraft.  High performance power electronics must continue to improve, yet these solutions historically require a complex multi-step process to rectify AC to DC and further achieve regulation and isolation of output.  While power factor correction and current distortion are key challenges in this process, existing conversion options such as auto transformer rectification units (ATRUs) and Vienna rectifiers can only solve these issues by accepting performance trade-offs that negatively impact weight, efficiency, size and cost.  To remove these limitations and improve performance of power electronics designs, Marotta Controls has developed 1-STEP AC-DC Conversion, an innovative topology for three phase active power factor correction.  Groundbreaking because it achieves regulation and isolation in a single step, 1-STEP technology not only simplifies complex circuitry, it creates a significant design advantage with reduced size and weight, extremely low harmonics (<3%) and unity power factor.

To download a copy of the full technical paper please register using the download form above in the sidebar.

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