Series-Resonant Medium Frequency Induction Heating System

Product Overview

This medium frequency induction heating system is designed around the series-resonant inverter structure, consisting of a MF power supply, a compensation capacitor box, and a customized induction coil. It is a high-efficiency, cost-effective solution widely used in metal melting, heat treatment, and thermal fitting applications.

Technical Highlights

Feature	Description
1. Power Structure	Series-resonant inverter topology using IGBT/MOSFET technology
2. Frequency Range	1–20 kHz, ideal for forging, melting, annealing, surface hardening
3. Capacitor Box	Provides capacitive compensation for inductive load, improves power factor
4. Induction Coil	Acts as both inductor and heating element, typically made from 3–10m copper tubing
5. High Efficiency	Operates at resonance point for maximum energy transfer and minimal losses
6. Compact System	Integrated MF power + capacitor + coil makes it easy to deploy and maintain
7. Application Flexibility	Suitable for melting, hot fitting, sintering, forging, spraying & more

Technical Explanation

The system works on LC series resonance, where the induction coil (L) and capacitor box (C) form a resonant circuit. At resonance, impedance is minimized, and current is maximized—allowing efficient energy transfer to the workpiece via eddy current heating.

However, the design also has several limitations:

Induction coil length is typically long (3–10 meters of copper tubing)
The coil is directly connected to high-voltage output (up to 550V) and is not isolated from the grid
In vacuum applications, the coil may cause glow discharge, so insulation is critical (high-temp tape, ceramic mud, varnish, or shielded enclosure required)

Series-Resonant Medium Frequency Induction Heating System