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How to compute MOSFET gate charge loss per cycle in Python using UliEngineering

You can easily compute the MOSFET gate charge loss per switching cycle using the UliEngineering Python library:

mosfet_gate_charge_loss_per_cycle.py
from UliEngineering.Electronics.MOSFET import mosfet_gate_charge_loss_per_cycle
from UliEngineering.EngineerIO import *

# Compute gate charge loss for 10nC gate charge at 12V
loss = mosfet_gate_charge_loss_per_cycle("10nC", "12V")
print(f"Gate charge loss per cycle (10nC, 12V): {format_value(loss, 'J')}")

# Compute gate charge loss for 50nC gate charge at 15V
loss = mosfet_gate_charge_loss_per_cycle("50nC", "15V")
print(f"Gate charge loss per cycle (50nC, 15V): {format_value(loss, 'J')}")

Example output

mosfet_gate_charge_loss_per_cycle_output.txt
Gate charge loss per cycle (10nC, 12V): 120 nJ
Gate charge loss per cycle (50nC, 15V): 750 nJ

The MOSFET gate charge loss per cycle represents the energy dissipated in charging and discharging the MOSFET gate capacitance during each switching event. This is a critical parameter for power efficiency calculations in switching power supplies, motor drives, and other high-frequency switching applications. The loss occurs due to the energy required to charge the gate and is dissipated as heat.

The gate charge loss per cycle is computed using the formula: $E = Q_g \times V_{drive}$, where $E$ is the energy in joules, $Q_g$ is the total gate charge in coulombs, and $V_{drive}$ is the gate drive voltage in volts. This represents the energy required to charge the gate capacitance, which is dissipated as heat in the gate driver and MOSFET gate resistance.

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