全新产品DIO232 Bachmann

DIO232  Bachmann

DIO232

我们都知道，不管电源是220V,380V,还是690V,每秒钟的交变都是以50HZ基准，50HZ我们把它叫做工频，软启动调制输出的，也是同频同相的工频电源。在这里重点说明的是：软起动的电压幅度调制，靠晶闸管正/负半桥，错位180度时间周期导通完成的！

这个导通时间周期，有什么依据？答案是：采样进线电压的同步信号！

不管是模拟的也好，数字的也好，都从进线，则通过电阻降压采样，得到一个弦波信号，我们称为同步信号。这个同步信号的作用就是：保证控制板输出的驱动信号同频同相，正半周可控硅上桥触发，负半周下桥导通。就这样，经过转化的UVW三相相位不产生变化（其实0度的时候有轻微的失真），电压产生变化，把输出电压逐渐提升到额定值。

所以，软起动基本的原理，就是将电压进行调幅的过程。比如，用户手册上讲的，30%电压线性启动，就是大约以100多伏的电压开始起动电机，而不是从0V开始（实际上很难）。

实际应用中，软起动是采取怎样的技术，在频率不变，逐渐调整电压幅值的呢。两个方法：

1.控制驱动脉冲的脉宽，由窄逐渐加宽，当输出电压和输入电压相等的时候，驱动脉冲和弦波宽度一致。例子如施耐德ATS48就是这种类型，国产的大多都是这种类型。

2.和变频器一样，在脉宽波中加入载波，控制载波频率的宽窄，来控制电压的变化。这种控制方法极其细腻的控制了驱动脉宽的变化，称为数字式软起动器，多见于品牌软起动器，启动平衡度非常好，使电压，电流，功率更加线性。

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