Product Overview

Defon Electronics manufactures custom toroidal transformers with power ratings up to 21000VA, designed for high-efficiency, low-noise, and compact power conversion applications.

Toroidal transformers feature a circular core structure that significantly reduces magnetic leakage, improves energy efficiency, and minimizes vibration and acoustic noise compared to traditional EI transformers.

Our custom toroidal transformers are widely used in industrial equipment, medical systems, audio amplifiers, renewable energy systems, automation equipment, and high-power electrical applications requiring stable and clean power output.

With strong engineering capability, we provide full OEM/ODM customization including voltage design, power rating up to 21000VA, insulation class, shielding, and mechanical structure.

Key Features

  • Power range up to 21000VA (21kVA high power design)
  • High efficiency toroidal core construction
  • Ultra-low magnetic noise and vibration
  • Compact and lightweight compared to EI transformers
  • High energy conversion efficiency
  • Low no-load loss design
  • Custom primary and secondary voltage options
  • Strong thermal stability for continuous operation
  • OEM / ODM customization supported
  • Suitable for high-end and industrial applications

Applications

Custom toroidal transformers are widely used in:

Industrial Equipment

  • Automation systems
  • Industrial power supplies
  • Machinery control systems
  • High-power electrical equipment

Audio & High-End Electronics

  • Professional audio amplifiers
  • Hi-fi sound systems
  • Studio equipment
  • Audio power supply units

Medical Equipment

  • Diagnostic devices
  • Imaging systems
  • Laboratory instruments
  • Precision medical electronics

Renewable Energy Systems

  • Solar power systems
  • Inverters and converters
  • Energy storage systems
  • Hybrid power systems

Commercial & Specialized Equipment

  • Communication systems
  • Security systems
  • Test and measurement equipment
  • High-reliability power modules

Electrical Performance

  • Extremely low magnetic leakage
  • High efficiency with reduced energy loss
  • Low acoustic noise and vibration
  • Excellent thermal performance under load
  • Stable voltage output under varying conditions
  • High dielectric strength insulation system
  • Reliable operation in continuous duty applications

Customization Options

We provide full OEM/ODM customization:

  • Input voltage: 110V / 220V / 230V / 240V / 277V / custom
  • Output voltage: single or multiple isolated outputs
  • Power rating: from low power up to 21000VA
  • Frequency: 50Hz / 60Hz
  • Insulation class: B / F / H
  • Shielding: electrostatic shielding optional
  • Mounting type: chassis / PCB / enclosed / custom housing
  • Terminal / connector / lead wire design
  • Safety certifications: UL / CE / ETL options
  • OEM branding and private labeling

Why Defon Electronics

Defon Electronics is a professional manufacturer of custom toroidal transformers, specializing in high-efficiency and high-power solutions up to 21000VA.

  • Strong engineering capability for high-power design
  • Stable mass production quality control
  • Expertise in low-noise transformer construction
  • Fast OEM customization and prototyping
  • Competitive factory pricing
  • Global export experience for industrial clients

We support both prototype development and large-scale OEM production.