IEC 60146: Semiconductor Converters — The Power Electronics Foundation from Thyristors to IGBTs

Semiconductor Converters: From Thyristor Rectifiers to IGBT Inverters — IEC 60146 Covers It All

IEC 60146-2:1999 specifies semiconductor converter requirements, covering everything from simple diode rectifier bridges to complex PWM inverters. This is the foundational standard for power electronics equipment.

Core concept: commutation. The fundamental challenge is transferring current from one switching device to the next. Line-commutated converters rely on AC grid voltage reversal to turn off thyristors — simple and reliable, but generate harmonics (characteristic 5th, 7th, 11th, 13th) and consume reactive power (PF ≈ cos α). Self-commutated converters (IGBT-based VSC) can actively control power factor (even leading), at higher device cost.

Selection triad: (1) Topology — diode/thyristor/IGBT/MOSFET determines cost and control flexibility. (2) Cooling — natural (≤50 A), forced air (50–500 A), liquid (≥500 A or high power density). (3) Harmonic compliance — IEC 61000-3-2/-3-4 limit converter harmonic injection; filters may be required.

TN Lab — Semiconductor converters are the foundation of modern power electronics, from EV fast charging to HVDC transmission.