多级节拍分配器的自启动电路

• 作 者: 袁永昇
• 出 处: 电子技术
• 发表日期: 1990年04期
• 关键词: 启动电路 脉冲序列 自动化设备 控制线路 相器 状态表 状态图 初始状态 函数表达式 工作循环

在数字控制的自动化设备中被广泛应用的节拍分配器又称为分相器。它的逻辑功能是将脉冲序列均匀地分配到各个控制线路中,达到分时操作的目的。构成节拍分配器的最简单方法是使用环形计数器。图1是使用环形计数器构成的4节拍分配器。这种电路虽然简单但是不能自启动。它须要有一个初始状态,在加电之后必须将电路置成初始状态: Q_1=1,Q_2=0,Q_3=0,Q_4=0 它才能正常地工作。

Beat dispensers, widely used in digitally controlled automation equipment, are also known as phase separators. Its logic function is the pulse sequence is evenly distributed to each control line, to achieve the purpose of time-sharing operation. The easiest way to make a beat dispenser is to use a ring counter. Figure 1 is a 4-beat dispenser using a ring counter. Although this circuit is simple but can not be self-starting. It needs to have an initial state that must be set to its initial state after power-up: Q_1 = 1, Q_2 = 0, Q_3 = 0, Q_4 = 0.