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At presrent, the photoelectric switch is more and more widely used in the industrial automation equipment.It can be finished counting industrial products by using the characteristic of the photoelectric switch which can detect the objects without touching them. This design uses the modular design method,including power-supply module, The photoelectric conversion module, optocoupler isolation circuit module, power off protection module, matrix keyboard module, counting module and The display module. It mainly uses 51 single-chip microcomputer to control the system,uses the keilC51 software to design program,uses the Proteus software to complete the simulation. Through the experiment, it proves the design is feasible. 相似文献
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为了满足脉冲电场消融的应用需求,解决单极性脉冲电场分布不均匀的问题,研制了一台基于半桥结构的主电路、具有纳秒级前沿的高重复频率双极性亚微秒高压脉冲电源。该脉冲电源由FPGA提供控制信号,经过驱动芯片放大控制信号后,利用光耦隔离驱动多个SiC MOSFET。驱动电路所需元器件较少,信号控制时序简单,可提供负压偏置,使开关管可靠关断,提高了电路的抗电磁干扰能力,使电源能稳定运行。通过电阻负载实验,对比分析了不同栅极电阻对驱动电压的影响,驱动电压上升沿时间越短对应的双极性高压脉冲前沿越快。实验结果表明:所设计的高频双极性脉冲电源在100Ω纯阻性负载上能够稳定产生重复频率双极性纳秒脉冲,输出电压0~±4 kV可调,脉宽0.2~1.0μs可调,正负脉冲相间延时0~1 ms可调,上升沿和下降沿60~150 ns之间。该双极性脉冲电源电路设计结构紧凑,能满足应用的参数需求。 相似文献
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