Active Capacitor Technology – Intelligent Energy Storage

Reinventing energy storage in power electronics

Active capacitors replace large capacitors with intelligent energy buffering and control, enabling higher power density and longer system lifetime.

  • Same functional role as DC-link capacitors

  • Reduced capacitance requirement and volume

  • Extends system lifetime through active ripple control

Explore how our Active Technology transforms your world

What is Active Capacitance?

Traditional capacitors rely on large dielectric volumes to store energy and stabilize voltage. In DC-link applications, this often requires bulky electrolytic capacitors to absorb low-frequency ripple and maintain system stability.

This leads to components that:

  • dominate system lifetime

  • limit power density

  • introduce thermal and reliability constraints

Active capacitance replaces this approach by combining:

  • a reduced physical capacitor

  • power electronics

  • real-time control

The system actively manages energy flow and compensates voltage ripple, emulating the behavior of a large passive capacitor with significantly reduced energy storage.

Active capacitors replace traditional passive capacitors by dynamically managing energy and stabilizing voltage through power electronics and control. This enables a significant reduction in physical capacitance while maintaining system stability and performance.

In DC-link applications, active capacitors reduce stress on electrolytic components, extend system lifetime, and enable more compact designs for high-performance power electronics.

Technical foundation

Beyond Passive – Intelligent Energy Management

Active capacitors introduce dynamic voltage control into the DC-link.

Instead of relying on large static energy storage, the system:

  • adapts to load conditions

  • compensates ripple in real time

  • controls energy flow actively

Key impact

  • Improved transient response

  • Reduced low-frequency ripple

  • Lower capacitor aging

This shifts capacitors from passive components to active system controllers

The full system potential is realized when combined with Hybrid DC-link systems, where both current and voltage are actively controlled.

Application Ready

DC-link in Motor Drives

  • Replaces large electrolytic capacitors

  • Reduces capacitance requirement

  • Improves system lifetime

  • Lower volume and weight

  • Reduced maintenance (longer lifetime)

  • Improved system reliability

Power Supplies & Converters

  • Stabilizes DC-link voltage

  • Improves transient performance

  • Higher power density

  • Better control performance

  • Reduced capacitor footprint

Built for Real Systems

The technology is designed for integration into real-world applications, including:

  • motor drives

  • grid converters

  • power electronics platforms

it is engineered for:

  • system compatibility

  • scalability

  • reliability

Key characteristics

  • Designed for standard DC-link architectures

  • Compatible with existing systems

  • Supports modular integration

Combined DC-link Platform

  • Active capacitor + active inductor

  • Full DC-link optimization

  • Maximum reduction in passive components

  • System-level differentiation

Work with us

We are working with industry partners to bring active capacitor technology into commercial systems.

By combining active capacitors with advanced magnetics, we enable a new generation of high-performance power electronic solutions.