电子负载仪的设计  

The design of electronic load instrument

作　　者：谭承君[1] 曾国强[1] 刘玺尧[1] 罗群[1] 龚春慧[1] 吴刚[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,四川成都610051

出　　处：《电子技术应用》2013年第8期73-76,共4页Application of Electronic Technique

基　　金：国家高技术研究发展计划(863)项目(2012AA061803);四川省科技厅科技支撑计划项目(2011FZ0064)

摘　　要：以增强AVR RISC结构的ATmega16控制器为核心,设计并制作了直流电子负载仪。系统通过斜波发生器产生的锯齿波和电流采样信号与控制信号的误差信号作比较产生约20 kHz的PWM波控制MOSFET管工作,然后经过误差放大器的PI调节构成闭环负反馈控制环路,实现恒流。恒阻和恒压模式通过软件实时调节流过MOS管电路的电流实现。实测数据显示,系统恒流模式下精度在1%以内,恒阻与恒功率模式下精度在3%以内。Using ATmegal6 controller which is enhanced AVR RISC structure as the core, we design a switching electronic load instrument. Comparing the sawtooth wave generated by the ramp generator with the error signal of the current sampling signal and the control signal, a PWM wave about 20KHz which controls MOSFET is generated. Then constitute a closed loop negative feedback control loop through amplifier PI regulator to achieve constant. Constant resistance and constant voltage mode can be de signed by software in real-time adjustment to flow through the current of the MOS transistor circuits. The measured data show that the accuracy within 1% in constant current mode, constant resistance and constant power mode accuracy within 3%.

关 键 词：电子负载 PI闭环调节 PWM波控制 恒流 恒阻 恒功率 

分 类 号：TM933[电气工程—电力电子与电力传动]