0 引 言
步进电机是工业控制中应用十分广泛的一种电动机,它能将数字信号直接转换成角位移或线位移,驱动速度和指令脉冲能严格同步,具有较高的定位精度,控制系统成本低廉,在经济型数控机床等领域应用广泛。这里针对电磁干扰较强以及要求低成本应用的场合,采用超强抗干扰、小巧低功耗的工业级STC12C系列单片机,充分利用单片机内部的硬件资源,设计实用的步进电机控制和驱动系统。
1 控制系统总体方案设计
系统功能原理示意图如图1所示。
在该系统中由单片机直接输出电机的各相控制脉冲序列,光耦进行必要的光电隔离,采用分立元件构成功率.MOSFET管驱动电路,带动电机转动。键盘接口与 LED显示功能由具有SPI串行接口功能的ZLG7289实现。既可使用按键输入的方式精确设置电机的工作方式与转速,也可以通过调速旋钮实现电机转速的连续调节,还能通过上位机实现对电机工作方式的调整与控制。
2 硬件电路设计
2.1 控制电路设计
控制芯片采用STC12C4052AD,它是1个时钟/机器周期的单片机,速度比普通的8051单片机快8~12倍,有20个引脚且为小巧封装。该单片机具有超强抗干扰,抗静电的特点,能轻松通过4 kV快速脉冲干扰,其功耗超低,正常工作模式下的典型功耗为2.7~7 mA。芯片自带硬件看门狗,具有高速SPI通信端口,8通道8位A/D转换,2路PWM输出,4 KB容量的FLASH存储器,256 B容量的SRAM,4个定时器,1个全双工串行通信口。由于单片机内部的资源丰富,性价比高,能够满足该设计的要求,而且减少了硬件电路的设计,提高了工作效率。单片机的外部引脚定义,及其在该设计中的资源分布如图2所示。
P1.4(ADC4)口外接4.7 kΩ的可调电位器,利用单片机内部的模/数转换功能转换成数字量,进而控制输出脉冲频率,完成步进电机速度的“连续”调节。过流检测的结果直接引入到外部中断0,实现对电流的快速控制。
2.2 驱动电路设计
功率MOSFET管的部分驱动电路如图3所示。该电路的设计可改进功率MOSFET管的快速开通时间,提高了驱动电流的前后沿陡度,能够改善高频响应。功率MOSFET管栅源间的阻抗很高,工作于开关状态下漏源间电压的突变会通过极间电容耦合到栅极,产生相当幅度的VGS脉冲电压。正方向的VGS脉冲电压可能会导致器件的误导通。为此,需要适当降低栅极驱动电路的阻抗,在栅源之间并接阻尼电阻或接一个稳压值小于20 V,而又接近20 V的齐纳二极管,以防止栅源开路工作。
为了抑制功率管内的快恢复,二极管出现反向恢复效应,在电路中接入4只快恢复二极管。其中,反并联快恢复二极管的作用是为电机相绕组提供续流通路,其余2 只是为了使功率MOSFET管内部的快恢复二极管不流过反向电流,以保证功率MOSFET管在动态工作时能起到正常的开关的作用。
2.3 显示与按键处理电路
在单片机应用系统中,典型的键盘显示接口电路由基于并行扩展技术的8155,8279构成控制电路。现代单片机应用系统广泛采用串行扩展技术。相对于并行方式,串行扩展接线灵活,占用单片机资源少。
ZLG7289A是具有SPI串行接口功能的可同时驱动8位数码管或64只独立LED的智能显示驱动芯片,单片即可完成显示、键盘接口的全部功能。采用串行方式与微处理器通信,数据从DIO引脚送入芯片,并由CLK端同步。当选信号变为低电平后,DIO引脚上的数据在CLK引脚的上升沿被写入 ZLG7289A的缓冲寄存器。图4是ZLG7289的典型应用。ZLG7289A连接共阴式数码管,应用中不需要的数码管与键盘可以不连接,省去数码管或对数码管设置消隐属性,这均不会影响键盘的使用。整个电路无需添加锁存器和驱动器,耗电少,软件设计中无需编写显示译码程序,省去了静态显示扩展芯片,大大节省了CPU的时间。该电路设计中仅采用4×4键盘和4位数码管,已完全满足设计需要。
3 软件设计
软件部分采用模块化结构设计。对步进电机转速的控制是通过定时器工作在中断方式实现的。定时器定时中断产生周期性脉冲序列,不是采用软件延时的方式,这样不占用CPU的时间。CPU在非中断时间内可以处理其他事件,只有在中断发生时才驱动步进电机转动一步。根据步进电机励磁状态转换,采用查表法求出所需的输出状态,并以二进制码的形式依次存入单片机内部的存储器中;然后按照正向或反向顺序依次取出地址的状态字,送给STC12C4052AD,输出各励磁状态,从而实现环形分配器的功能。
程序总体框架包括:主程序、过流检测中断服务子程序、定时器中断服务子程序、以及其他子程序(包括正转、反转子程序、键盘显示控制子程序、A/D转换子程序等),由于篇幅限制,在此不一一叙述。
4 系统测试
该系统采用超强抗干扰,小巧低功耗的工业级STC12C4052AD单片机为控制核心,工作可靠性高,抗于扰能力强。系统测试在专门的检测实验室内进行。利用群脉冲发生器(EFT-4001)、周波电压跌落发生器(VDG-1105)、静电放电发生器(ESD-20)以及雷击浪涌发生器(SG-5006) 等专用仪器对系统的电压变化抗扰度、快速瞬变脉冲群抗扰度、抗静电和雷击浪涌等参数进行检测。经过实验,系统功能正常,所有参数均已达标。
5 结 语
电子技术发展日新月异,新型单片机层出不穷。在电机控制系统开发过程中,如果恰当选取单片机以及各电路模块的型号,能够简化设计过程,起到事半功倍的效果。该系统采用STC12C4052AD单片机,其工作方式、转动速率及转矩数可以通过键盘输入,也可通过普通旋钮或上位机调节。键盘显示模块采用 ZLG7289实现。本系统具有通用性,适当改变输出口各位控制端,便可控制不同相数的步进电机。
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EP1S40B956C5
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EP1S40B956C6
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EP1S40F1020
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EP1S40F1508C5
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EP1S40F1508C7
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EP1S60F1508C6
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EP1SGX10CF672
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EP1SGX10DF672
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EP1SGX10DF672C7
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EP1SGX25CF672
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EP1SGX25CF672C7
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EP20K00QC208-1X
EP20K00QC208-3V
EP20K00QC240-1XV
EP20K00QC240-3V
EP20K00QI208-2V
EP20K00QI240-2V
EP20K1000CB652C7
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EP20K1000CB652C8
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EP20K1000CF33C7
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EP20K1000CF672C7
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EP20K1000CF672C8
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EP20K1000CF672I9
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EP20K1000EBC652
EP20K1000EBC652-1
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EP20K1000EBC652-1X
EP20K1000EBC652-2
EP20K1000EBC652-2N
EP20K1000EBC652-2X
EP20K1000EBC652-3
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EP20K1000EBI652-2
EP20K1000EBI652-2N
EP20K1000EBI652-2X
EP20K1000EFC-2X
EP20K1000EFC33
EP20K1000EFC33-1
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EP20K1000EFC33-2
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EP20K1000EFC33-3
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EP20K1000EFC672
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EP20K1000EFC672-2
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EP20K1000EFC672-3
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EP20K1000EFI33-1
EP20K1000EFI33-1N
EP20K1000EFI33-1X
EP20K1000EFI33-2
EP20K1000EFI33-2N
EP20K1000EFI33-2X
EP20K1000EFI33-3
EP20K1000EFI33-3N
EP20K1000EFI672-2N
EP20K1000EFI672-2X
EP20K100BC356-1
EP20K100BC356-1N
EP20K100BC356-1V
EP20K100BC356-2
EP20K100BC356-2N
EP20K100BC356-2X
EP20K100BC356-3
EP20K100BC356-3N
EP20K100EBC356
EP20K100EBC356-1
EP20K100EBC356-1N
EP20K100EBC356-1X
EP20K100EBC356-2
EP20K100EBC356-2N
EP20K100EBC356-2X
EP20K100EBC356-3
EP20K100EBC356-3N
EP20K100EBI356-1
EP20K100EBI356-1N
EP20K100EBI356-1X
EP20K100EBI356-2
EP20K100EBI356-2N
EP20K100EBI356-2X
EP20K100EBI356-3
EP20K100EBI356-3N
EP20K100EFC144
EP20K100EFC144-1
EP20K100EFC144-1N
EP20K100EFC144-1X
EP20K100EFC144-2
EP20K100EFC144-2N
EP20K100EFC144-2X
EP20K100EFC144-3
EP20K100EFC144-3N
EP20K100EFC256-2X
EP20K100EFC324
EP20K100EFC324-1
EP20K100EFC324-1N
EP20K100EFC324-1X
EP20K100EFC324-2
EP20K100EFC324-2N
EP20K100EFC324-2X
EP20K100EFC324-3
EP20K100EFC324-3N
EP20K100EFC484-2X
EP20K100EFI144-1
EP20K100EFI144-1N
EP20K100EFI144-1X
EP20K100EFI144-2
EP20K100EFI144-2N
EP20K100EFI144-2X
EP20K100EFI144-3
EP20K100EFI144-3N
EP20K100EFI324-1
EP20K100EFI324-1N
EP20K100EFI324-1X
EP20K100EFI324-2
EP20K100EFI324-2N
EP20K100EFI324-2X
EP20K100EFI324-3
EP20K100EFI324-3N
EP20K100EFI484-2X
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