Introduction to stepper motor driver control chip types

With the steady development of industrial production and home appliance industries, toy motors and intelligent robot sales markets, stepper motors are increasingly used. The stepper motor drive integrated circuit is an integrated circuit that integrates a CMOS control loop and DMOS power electronics. It can form a complete automatic control system with the main CPU, motor and incremental servo motor. It can be used to drive brushless DC motors, stepper motors, automotive relays and other AC currents.

Stepper motor drivers are divided into two types: voltage type and current type. What are the differences between them?

1. Voltage type:

The DC circuit uses capacitor filtering. At high voltage, the capacitor stores electric field energy, and at low voltage, the capacitor releases electric field energy for filling, thereby keeping the DC voltage stable. A DC circuit is a voltage source, hence it is called voltage type.

2. Current type:

The DC circuit uses an inductor filter. When the current is high, the reactor stores magnetic field energy. When the current is small, the reactor releases the magnetic field energy and begins to fill it, keeping the DC stable. A DC circuit is a current source, hence it is called current type.

Because the load is generally reasonable, there must be reactive load transmission between it and the switching power supply, so there must be a cache component for the reactive load in the middle of the DC stage. If a large capacitor is used to buffer the reactive load, a voltage source soft starter is formed. If a large reactor is selected to buffer the reactive load, a current source soft starter is formed.

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