What is?

In induction cooktops, a single-ended drive (SED) system refers to a minimalist inverter topology in which a single high-frequency switching device (IGBT/MOSFET) drives the entire induction coil. Unlike complex multi-switch designs such as half-bridge/full-bridge designs, SED achieves heating through resonance, requiring significantly fewer components. 

Principle

Circuit Structure:

• Single IGBT/MOSFET + resonant capacitor (LC tank)
• Direct DC-to-AC conversion via switching at 20–100 kHz

Key Workflow:

• ON Phase: Current flows → coil charges → creates magnetic flux
• OFF Phase: Freewheeling diode discharges coil → sustains oscillation

Power Modulation:

• Adjusts heat via burst-fire control (rapid ON/OFF cycles) or frequency shift

Advantages

• Easy replacement of IGBTs
• Direct access to IGBTs for measurements
• Easy exchange of resonant coil