Active electronic load

Key features:

Up to 30A @ 32V DC

two current ranges ( 3A/30A)

Circuitprotection

• Overcurrent shutdown
• Overvoltage shutdown
• thermal shutdown

TFT Interface with RS232 interface

external SPI - BUS and I2C SMBUS for integration in Electronic Workbench with central control interface (not included in this project)

all Features simulated and tested with Multisim

Actual Design on 6Layer PCB caused by high current topic with 1oz copper each layer

SIMULATION RESULTS

setting 2A with 2V DAC without Error

setting 20A with 2V DAC without Error

Power dissipation at 24V and 20A on MOSFET and resistor --> TOTALPOWER = 117W * 4 MOSFETS= 468W

CURRENT and VOLTAGE measurement 24V 20A calibrated with variable resistors

CURRENT to voltage MCU = ILOAD /10 at High Current State (low mode Voltage= Current)

Voltage MCU = VIN /10

protection system is hard to document caused by event triggered but works perfect including reset function