Intelligent motor drive circuit used for controlling liquid flow

Abstract

A single-chip stepping motor controller integrated circuit L297 serves as a control kernel, a pulse distributor, a PWM chopper, an output logic control unit and other modules are integrated inside, and accordingly system control is more convenient and easy to achieve. A split power drive circuit composed of a triode transistor and a power MOS tube replaces an integrated block circuit, so that cost of a system is reduced, and the requirements for driving a wide-voltage large-current stepping motor can be met. Meanwhile, a power supply conversion integrated circuit QX3400 is used as a kernel, the design of a high-frequency DC-DC conversion circuit meets the requirements of a multi-channel power supply of the system, and accordingly multiple power supply input can be adopted in the handheld system using the control scheme. Besides, a full-digital feedback control function of a stator winding of the stepping motor is achieved, the photoelectric isolation function is carried out on input and output signals, and anti-interference capacity and operation reliability of a controller are improved. A motor drive circuit has the advantages of being compact in structure, small in size, flexible in use, high in control precision and high in adaptability.

Description

technical field [0001] The invention relates to a motor control device, in particular to a driving circuit of an all-digital stepping motor controller. Background technique [0002] The on-site rapid detection system of the sanitation prevention system has relatively high requirements for the flow control to be detected in order to achieve high accuracy due to the small sampling volume, especially the hand-held type, which cannot realize multi-power supply and high-power power supply due to the limitation of the volume. The motor control circuit requirements of the liquid sampling system are even higher. At present, the diaphragm pump method and the DC motor drive method are widely used in the market to extract liquid samples. The control circuit of these methods is too complicated for micro sampling, and the power supply The precision requirement is higher. For this reason, synchronous motor drive methods have recently appeared on the market, because the structure of stepp...

AI Technical Summary

Problems solved by technology

However, due to the manufacturing process, in order to realize the control of the stepping motor, the drive circuit is relatively complicated, and the feedback adjustment function of the current cannot be well realized.

And there is no limit function for current changes, no communication interface circuit

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