Abstract:

In view of the wide application of the electronic load in the power equipment test,a DC electronic load with the MSP430F149 microcontroller as core processor is developed.The ADC12 module built in the microcontroller samples the voltage and current of the load in real time.The external 10 bit D/A conversion chip TLC5615 outputs analog voltage signal to drive MOS transistor.BP neural network algorithm is adopted in the internal control.The system achieves 4 operating modes:the constant current,constant voltage,constant resistance and constant power modes.Practical tests show that the adjusting time is less than 3 seconds with the voltage and current measurement error less than ±0.5%.With fast tracking speed and high accuracy,the design is of economic value.

Key words: DC electronic load;MSP430F149;TLC5615;BP neural network algorithm