燃料电池内阻测试用程控高频交流电流源设计与研究

ccording to the characteristics of the testing methods of fuel cells impedance,the programmable AC current source was designed which was consist on the micro-controller, sine wave signal circuits, programmable gain amplifier circuits, power amplifier and protection circuits, and CAN communication interface circuits.The programmable AC current source combined with PID control algorithm to overcome shortcomings of the traditionalAC current source, such as narrow-band output, low precision and small current. The results of the testing of actual fuel cells impedance indicated that the current source is good at the characteristics of output frequency band, amplitude accuracy and stability.