用于农药喷洒的可控高压静电电源设计

Design of controllable high-voltage electrostatic supply for spraying pesticide

为农作物静电喷雾试验设计一种输出可控直流高压静电的装置。装置硬件部分主要采用PWM控制方式改变开关管的导通与关闭时间比率,实现输出电压的可控性。输出电压可控范围0-30 k V,最小调节量为1 k V,误差为±0.5 k V,输出电流在50。检测显示电路依靠分压采样与A/D转换可测量电压并在液晶屏上显示,能够绘制电压的实时变化曲线,以便对负载阻态的变化进行实时观察。用高压电表对该装置的输出端进行测量,结果表明,该装置的输出端为可控高电压小电流＂静电＂。

A controllable DC high voltage electrostatic device was designed for electrostatic spraying experiment on crop. The hardware of the device changed the ratio of conduction and closing by applying PWM control pattern which could control the output voltage magnitude. Output voltage could be controlled in range of 0-30 kV and minimum adjustment amount was 1 kV with error in ±500 V.The output current was about 50 μA. Detection and display circuit could measure and display the value of output voltage and the dynamic curve of output in real time by sampling of divided voltage and A/D converting to achieve the real- time state of load observation. The result measured by high voltage meter showed that the device had generated controllable electrostatic with high voltage and low current.