Medium Frequency Induction Heating Power Supply

1.The Medium frequency IGBT induction heating power supply mainly consists of the following modules:

Rectification unit

Rectify AC power (50Hz) into DC power, usually using three-phase fully controlled bridge rectification or diode rectification.

Filter unit

By using DC reactors or capacitors for filtering, voltage fluctuations are eliminated and a stable DC power supply is provided.

Inverter unit (core part)

Invert DC power into medium frequency AC power (1-20kHz), commonly using IGBT or MOSFET as switching devices, and adopting series or parallel resonant circuits.

Resonant circuit

The LC resonant circuit is composed of an induction coil (load) and a compensation capacitor, which improves heating efficiency through resonant boost/current.

Control and protection circuits

Using PWM or PFM to regulate power, achieving automatic frequency tracking (maintaining resonance state), and equipped with overcurrent, overvoltage, and overheating protection.

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2. Workflow
Rectification and filtering: The input three-phase AC power is rectified and filtered to become DC power.

Inverter and Resonance: DC electricity is converted into intermediate frequency AC through an inverter to drive an LC resonant circuit.

Energy coupling: The induction coil generates an alternating magnetic field, causing eddy current heating inside the workpiece.

Closed loop control: Real time detection of load current/voltage, adjusting the inverter frequency to match the resonance point (such as phase-locked loop PLL technology).

3. Key features
Efficient and energy-saving: Heat is directly generated inside the workpiece, with a thermal efficiency of up to 60% to 80% (much higher than resistance heating).

Precise temperature control: By adjusting frequency and power, local or uniform heating can be achieved, suitable for processes such as quenching, melting, brazing, etc.

Quick response: extremely fast heating speed (in seconds), suitable for automated production lines.

Non contact heating: Avoid contamination and extend the lifespan of the workpiece.

Medium frequency induction heating power supply

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