IGBT Loss Calculator

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Estimate IGBT conduction loss, switching energy loss, diode recovery contribution, total dissipation, and junction temperature for inverter and motor-drive applications.

Input Parameters

Collector Current

VCE(sat)

Duty Cycle

Switching Frequency

kHz

Turn-on Energy Eon

Turn-off Energy Eoff

Diode Recovery / Extra Energy

Thermal Resistance Junction-Ambient

°C/W

Ambient Temperature

°C

Results

Conduction Loss

Switching Loss

Total IGBT Loss

Estimated Junction Temperature

Loss Dominance

Design Note

Equations Used

Pcond ≈ VCE(sat) × IC × Duty

Psw ≈ (Eon + Eoff + Erec) × fsw

Ptotal = Pcond + Psw

Tj ≈ Ta + Ptotal × RθJA

Frequently Asked Questions (FAQ)

Q1: What does an IGBT loss calculator estimate?
It estimates conduction loss, switching loss, total loss, and thermal rise for an IGBT device.

Q2: Where do Eon and Eoff come from?
They are switching energies from the IGBT datasheet at specified voltage, current, gate resistance, and temperature.

Q3: Why is IGBT loss only an estimate?
Datasheet energy values change with bus voltage, current, gate resistance, temperature, and layout parasitics.

Q4: When is IGBT better than MOSFET?
IGBTs are often used at higher voltage and power levels, while MOSFETs are usually preferred for lower voltage and higher-frequency switching.

Q5: Can this replace thermal simulation?
No. Use it for first-pass estimates and verify with thermal models and measured case or junction temperature.

Disclaimer: This is an engineering estimator. Real IGBT loss depends on waveform shape, device temperature, gate resistance, DC-link voltage, diode behavior, modulation, heatsink, and PCB/busbar layout.

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