The control hardware of wye-delta soft start is shown in
Figure 2. And it mainly contains
1) Voltage detection component, which consists of the
voltage transformer and its auxiliary circuit, is used to collect
the real-time voltage signal of motor.
2) SCM control component contains single-chip
microcomputer chip, A/D conversion device, contactor drive
circuit and thyristor trigger control circuit. A universal chip
which has more than eight bits can be used as the core of SCM.
By A/D conversion device, the voltage analog signal detected