Polyax is developing solid-state transformer technology to empower the grid of the future.
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Developing Solid-State Transformer
Technology for the Grid of the Future.

Medium-Voltage Conversion
SST Control Intelligence
High-Frequency Magnetics

We are building a new solid-state transformer device that targets higher efficiency, tighter control, and stronger resilience for utilities, data centers, and electrified industry. Our platform combines high-frequency transformers, modular converters, advanced controls, and fast protection into a deployable MV architecture.

PX-SYSTEM // DIAGNOSTIC INITIALIZING...
FLUX: 0.00 T
TEMP: 24.0 °C
FREQ: 100 kHz
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Technology platform

Core subsystems powering our solid-state transformer architecture.

High‑Insulation Transformers

Compact, safe isolation at medium voltage.

We design and validate high‑frequency transformers for medium‑voltage applications with a focus on insulation coordination, partial‑discharge control, and manufacturability. Our work targets compact, cost‑effective MV isolation using planar approaches where appropriate, robust winding structures, advanced materials, and thorough test plans—bridging simulation, HIL, and lab characterization. Target domains include renewables, EV, marine, aerospace, and data‑center power.

Planar Magnetics

Simulation, prototype, and characterization for high performance and reliability.

We develop planar transformers and inductors tuned for wide‑bandgap switching frequencies and high power density, emphasizing low loss, tight coupling, and consistent manufacturing. We combine 2D/3D EM modeling, thermal models, and test infrastructure to correlate predictions with hardware. Our roadmap includes scalable MV planar solutions and cost‑optimized stacks for production.

Cooling Architecture

Two‑phase and advanced air/liquid paths co‑designed with magnetics and mechanics.

We co‑design thermal pathways with power stage and magnetics, exploring two‑phase cooling and advanced air/liquid loops. We aim to translate data‑center cooling techniques into medium‑voltage power electronics, pairing CFD and sensor feedback with control algorithms (pumps/fans/valves) to improve reliability and energy efficiency at scale.

Modular Power‑Dense Converters

Repeatable sub‑modules for various applications.

We architect repeatable MV converter sub‑modules that scale across applications. Efforts include topology selection, SiC switch utilization, EMI/EMC strategies, and robust mechanical/thermal integration. We consider serviceability, instrumentation, and production test strategies early to accelerate qualification and manufacturing ramp.

Advanced Distributed Control

Multi‑node, fault‑tolerant control with synchronized sensing.

We implement novel control algorithms—current control, DC control, controllable dynamic load with programmable profiles (including data‑center load emulation), and grid‑islanding modes—across distributed nodes with time‑aligned sensing. Roadmap items include AI‑assisted control and industrial IoT for predictive diagnostics and adaptive grid interaction.

Reduced THD & Circulating Currents

Topology and control strategies to minimize distortion and parasitics across operating envelopes.

We reduce harmonics and parasitics using modulation, interleaving, and balancing strategies that hold across real operating envelopes. Our approach integrates device physics, magnetics layout, and control to suppress circulating currents, improve power quality, and meet compliance targets with margin.

Smart Protection Techniques

Fast detection and coordinated response to abnormal conditions without false trips.

We design protection that reacts in microseconds while minimizing false trips: sensing chains, MV gate‑driver protection, optical isolation, and coordinated fault response across nodes. We validate protection timing against WBG device di/dt and dv/dt realities and integrate diagnostics into system control and HIL benches.

Utility Feeders • Data Centers • Microgrids • Fast EV Charging • Industrial Electrification • Defense Energy Systems
Polyax circuit prototype

Roadmap

How we move from SST prototype to scaled deployment.

Prototype Validation

01

Architecture Freeze

Finalize converter, transformer, protection, and controls architecture for the first integrated SST prototype.

02

Subsystem Bench Testing

Validate high-frequency magnetics, switching nodes, and control loops under representative stress conditions.

03

Integrated HIL Validation

Run hardware-in-the-loop and fault-injection scenarios to de-risk full-system behavior before pilot deployment.

04

Readiness Review

Complete design and test gate review with pilot success metrics, instrumentation plan, and deployment requirements.

Team & partnerships

We are an interdisciplinary team spanning power electronics, controls, magnetics, software, and test engineering. We work with pilot partners across utility, data center, industrial, and defense energy systems.

Progress snapshot

  • Build status: Integrated SST subsystem prototype in active validation.
  • Target profile: Higher efficiency, faster control response, and resilient MV operation.
  • Validation stack: Simulation, HIL, and bench testing with fault scenarios.
  • Pilot phase: Recruiting early utility, data center, and industrial partners.
  • IP path: Ongoing filings and know-how development across magnetics, controls, and protection.

Let's evaluate pilot fit

Select your application and partnership stage so we can route your request to the right technical lead.

Partnership stage

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FAQ

Answers for pilot partners, strategic customers, and early supporters.

What exactly is Polyax building?

We are building a solid-state transformer platform for medium-voltage power conversion. The system integrates high-frequency isolation, modular conversion stages, controls, and protection to improve efficiency, resilience, and observability.

Who is this technology for?

Our primary focus is utility distribution, data center power infrastructure, and industrial electrification where dynamic loads, efficiency, and reliability are all critical.

What stage is the product at today?

We are in active prototype validation and pilot planning. Current work is focused on subsystem validation, integrated controls, and deployment readiness with early partners.

How can we engage with Polyax?

You can engage as a pilot host, technical validation partner, manufacturing collaborator, or strategic investor. Share your context through the contact form and we will route it to the appropriate lead.

What differentiates your SST approach?

We are co-designing magnetics, power stage, controls, and protection as one system. That integration is central to our target performance on efficiency, response speed, and operational resilience.

What medium‑voltage (MV) capabilities do you offer?

MV isolation design, MV gate driver chains, protection strategies, reduced‑THD topologies, thermal architectures, instrumentation, and distributed control for MV drives and related applications in renewables, EV, marine, and aerospace.

Do you plan software on top of hardware?

Yes. Our roadmap includes a telemetry and controls intelligence layer for monitoring, diagnostics, adaptive tuning, and fleet optimization.

When are pilot programs opening?

We are onboarding early design partners now. If you have a potential deployment environment, share your use case and constraints through the contact form.

How quickly will your team respond?

We respond to qualified technical and partnership inquiries within two business days.

Request pilot conversation See roadmap

Contact

Tell us about your application and partnership goals. We'll reply within 2 business days.

Pilot opportunities we're prioritizing

  • Grid-edge medium-voltage conversion
  • Data center power resilience
  • Fast-response controllable loads
  • Electrified industrial systems
  • Software-defined power operations