On-Board Chargers (OBC), micro-inverters, small solar inverters, and industrial power supplies.


The technology is also applicable to embedded systems, consumer electronics, and distributed energy devices.

Benefits include

  • Compact design

  • Improved reliability

  • Reduced EMI

  • Enhanced transient response.

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Typical challenges

  • Limited space for passive components

  • High ripple currents

  • EMI issues

  • High efficiency in compact designs.

    Designers often struggle to balance size, cost, and reliability while meeting performance standards.

Our active capacitor offers

  • Compact design

  • High-performance energy buffering

  • Reduced ripple

  • EMI

    The scalable platform enables easy integration into small systems, improving both reliability and efficiency—without increasing size or cost.

P2 Active Capacitor for 3.3kW Power Supply

(For AI datacenter application)

Design and Result Compared to Existing Solutions

  • Design: The proposed method introduces a low-voltage H-bridge active capacitor in series with the DC-link capacitor. It operates in three modes:

    1. Charging mode: Charges backup capacitor C₂.

    2. Normal mode: Bypasses C₂ to minimize losses.

    3. Hold-up mode: Uses stored energy in C₂ to maintain output voltage during ACLDO.

  • Results:

    • Volume Reduction: Achieves 34.1% reduction compared to passive capacitor banks.

    • Power Loss Reduction: Delivers 32% lower power loss than the baby-boost method.

    • Flexibility: Allows tuning between volume and loss by adjusting the reference voltage of C₂ (VC₂,ref), offering a customizable trade-off.

    • Plug-and-play: No need to modify existing converter topology or control systems.

Main Technical Requirements

  1. Hold-up time extension without increasing system volume: Traditional passive capacitor banks require large volumes to meet hold-up time requirements during AC line-cycle dropout (ACLDO).

  2. Minimizing power loss: Existing active methods like the baby-boost configuration introduce significant conduction losses due to high voltage and current stress on switching devices.

  3. Compatibility with existing converter topologies: Many solutions require intrusive changes to the converter’s control or topology, limiting their applicability.

Let’s Explore Your Application – Together

At Nordic Passive, we always offer a pre-development analysis tailored to your specific application. This initial study is designed to support a go/no-go decision for a potential collaboration — with no strings attached.

Our scalable platform is built to adapt across a wide range of power electronics applications. With only minimal fine-tuning, we can integrate our active capacitor technology to deliver measurable improvements in at least one critical performance factor — whether your priority is cost, reliability, or size/weight.

We believe in data-driven partnerships, and our goal is to help you validate the potential before committing.


Let’s explore how our technology can elevate your system — from concept to performance breakthrough.

Want to know if we have a solution for you?

Feel free to contact us for more information on how we can help optimizing your product.