What is the difference between flat wire and round wire inductors?

Flat wire inductors use flat copper wire with fill factor up to 45-55% (vs 35-45% for round wire), DCR reduced by 20-30%, lower AC losses at high frequency, and better thermal dissipation.

What information helps ProMagTech review a custom magnetic component project?

ProMagTech reviews target electrical parameters, application environment, reliability requirements, material requirements, and required qualification documents for each custom magnetic component project.

How high is the power density of ProMagTech planar transformers?

ProMagTech's new ultra-thin planar transformer is only 8mm thick with 40% higher power density than the previous generation, achieving up to 98% efficiency, suitable for LLC, CLLC and other high-efficiency resonant topologies.

ProMagTech

High Current Flat Wire Inductors

ProMagTech specializes in flat wire winding technology, reducing inductor DCR by 30% and increasing saturation current by 25%. Widely used in EV charging stations (20-60kW), solar storage inverters (1-50kW), and industrial automation., samples delivered in 5-7 days.

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15+

Years Experience

50+

Global Clients

200+

Products

30+

Countries

Core Advantages

Why industry leaders choose ProMagTech

⚡

Low DCR Flat Wire Design

Flat copper wire winding with 27% larger rectangular cross-section than round wire. Lower skin effect, DCR reduced by 20-30% compared to traditional products, improving overall efficiency to 98%+.

🔬

Precision R&D

Independent R&D team with 20+ patents, continuous investment in technology innovation. Custom design capabilities with OEM/ODM support.

🏭

ISO Quality & Environmental Certified

Production and quality evidence will be expanded with factory process photos, test capability records, and project-specific quality documents.

🌏

Global Service Network

Products exported to 30+ countries. Localized technical support in Southeast Asia (Indonesia, Vietnam, Thailand), Pakistan and other emerging markets.

💠

Rapid Customization

One-stop service from design to mass production based on your electrical parameters (inductance, current, frequency). Samples delivered in 5-7 days.

🛡

100% Factory Inspection

Every product undergoes DCR testing, inductance testing, and Hi-Pot testing before delivery, ensuring zero-defect quality.

Contact Us

Contact Person

Zhang Yong

Phone / WhatsApp

+86 13537658938

Email

zyong@promagtech.cn

Address

No. 22 Dongkeng Road, Fenghuang Street, Guangming District, Shenzhen, China

Website

www.promagtech.com

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📍 Shenzhen, China

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Service Commitment

Fast Response

Technical team provides initial proposal within 1 business day

Free Evaluation

Free sample evaluation service available

Technical Confidentiality

Strict confidentiality for customer technical data

Products

Full range of high-performance power magnetic components for various power levels and applications

High Current Flat Wire Inductor

Featuring flat copper wire winding for ultra-low DCR and excellent thermal performance. Designed for EV, energy storage and other high-current applications.

Three-Phase Common Mode Inductor

Nanocrystalline core designed for three-phase power systems. Excellent common mode impedance for PV inverters and energy storage converters.

Planar Flat Wire Transformer

Flat wire winding with nanocrystalline core for ultra-high power density. Suitable for LLC, CLLC resonant topologies up to 200kHz.

SQ Common Mode Inductor

Designed for EV motor drive and inverter EMC filtering. for automotive applications.

Charging Station PFC Inductor

Designed for EV DC charging station PFC circuits with flat wire winding supporting high power output.

High-Frequency Amorphous CM Inductor

Amorphous core with PCB-mounted winding structure, ultra-thin design for SiC/GaN high-frequency applications.

PFC Boost Flat Wire Inductor

Designed for single-phase/three-phase PFC circuits with low DCR and low temperature rise.

Energy Storage Inductor

Designed for energy storage converters and bidirectional DC-DC modules. available.

SMD Flat Wire Inductor

Ultra-thin SMD flat wire inductor for consumer electronics and compact industrial power modules.

For more product details: www.promagtech.com/products

Technical Resources

Deep dive into magnetic component design principles, selection guides, and application cases

Selection Guide

Flat Wire vs Round Wire Inductors: How to Choose?

Comprehensive comparison of two winding technologies from DC resistance, saturation current, thermal performance, and cost.

Design Calculation

20-60kW PFC Inductor Selection & Design Guide

Detailed explanation of inductor selection steps, calculation formulas, and design considerations for three-phase PFC circuits.

EMI Design

Common Mode Inductor Design Guide: Improving EMI

Systematic explanation of common mode choke optimization methods from core material selection to winding structure and grounding.

Selection Guide

800V Platform Inductor Selection: EV High Voltage Solutions

Key points on insulation distance, partial discharge, and thermal management design for 800V architecture requirements.

Reliability Analysis

Southeast Asia EV Charger Reliability Design

Analysis of magnetic component reliability design strategies for harsh environments including high temperature, humidity, and salt spray.

Whitepaper

Solar Energy Storage Magnetic Components Whitepaper

Comprehensive analysis of magnetic component technical requirements and selection recommendations for energy storage PCS and PV inverters.

About ProMagTech

ProMagTech (Shenzhen Pumici Technology Co., Ltd.) was founded in 2013, specializing in R&D, manufacturing, and sales of power magnetic components. Located in Guangming District, Shenzhen, we have modern production facilities and comprehensive quality testing systems.

Our main products include flat wire inductors, planar transformers, common mode chokes, PFC boost inductors, energy storage inductors, and high-frequency amorphous reactors. Our core products feature flat copper wire winding technology and nanocrystalline core materials, offering low DCR, high saturation current density, excellent thermal performance, and high reliability.

Products are widely used in EV OBC (On-Board Chargers), DC-DC converters, EV DC charging stations (20kW-60kW), solar inverters, energy storage converters (PCS), industrial power supplies, and 5G communication power supplies. Product evidence, material declarations, and reliability test scope should be confirmed for each project before qualification.

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2013

Company founded, focused on magnetic component manufacturing

2015

Flat wire inductor technology breakthrough, first export to Southeast Asia

2018

Entered EV supply chain, partnered with leading Chinese EV manufacturers

2021

R&D center expansion, production capacity doubled

2026

Ultra-thin planar transformer mass production, annual capacity exceeds 1 million units