CN204681278U

CN204681278U - A kind of micro-stepping driving of stepping motor system

Info

Publication number: CN204681278U
Application number: CN201520366178.8U
Authority: CN
Inventors: 李劲; 李松; 刘俊
Original assignee: Yangzhou Dajin Motor Manufacturing Co Ltd
Current assignee: Yangzhou Dajin Motor Manufacturing Co Ltd
Priority date: 2015-06-01
Filing date: 2015-06-01
Publication date: 2015-09-30
Anticipated expiration: 2025-06-01

Abstract

The utility model relates to a kind of micro-stepping driving of stepping motor system regions, belongs to driving stepper motor field.A kind of micro-stepping driving of stepping motor system of the utility model; comprise FPGA control chip, optical coupling isolation circuit, power amplification circuit, H-bridge drive circuit and current protecting circuit; FPGA control chip, optical coupling isolation circuit, power amplification circuit and H-bridge drive circuit are linked in sequence; then access stepping motor, and current protecting circuit is being connected to form a closed loop circuit with stepping motor and FPGA control chip respectively.The Multi-level microstep system that the utility model adopts has the advantages such as cost is low, volume is little, response is fast, use safety, well can adapt to the demand of various occasion.

Description

A kind of micro-stepping driving of stepping motor system

Technical field

The utility model belongs to driving stepper motor field, particularly relates to a kind of micro-stepping driving of stepping motor system regions.

Background technology

Multi-level microstep refers to the driving method " the intrinsic step angle of motor " being subdivided into some small steps, and segmentation is realized by the phase current of the accurate control step motor of driver, has nothing to do with motor itself.Its principle is, stator energized phase electric current is allowed once not to be raised to position, and power-off phase current once not reduce to 0(winding current waveform be no longer approximate square waves, but N level is similar to staircase waveform), make a concerted effort in the magnetic field that then stator winding current produces, rotor can be made to have N number of new equilbrium position (forming N number of step angle).

Existing Design of Stepper Motor Control Circuit, the higher motor internal of holistic cost there is electromagnetic interference or protectiveness is inadequate, and motor easily burns in operation process, and these are all the technical problems that we are badly in need of solving.

Utility model content

Goal of the invention of the present utility model is the above problem solving stepping motor, provides a kind of micro-stepping driving of stepping motor system.

A kind of micro-stepping driving of stepping motor system of the utility model; comprise FPGA control chip, optical coupling isolation circuit, power amplification circuit, H-bridge drive circuit and current protecting circuit; FPGA control chip, optical coupling isolation circuit, power amplification circuit and H-bridge drive circuit are linked in sequence; then access stepping motor, and current protecting circuit is being connected to form a closed loop circuit with stepping motor and FPGA control chip respectively.

What FPGA control chip adopted is EP2C8Q208C8N chip.

What optical coupling isolation circuit adopted is HCPL2630 chip.

What power amplification circuit adopted is IR2110 chip.

What current protecting circuit adopted is that LM393 voltage comparator realizes.

The utility model beneficial effect is as follows:

The Multi-level microstep system that the utility model adopts has the advantages such as cost is low, volume is little, response is fast, use safety, well can adapt to the demand of various occasion.

Accompanying drawing explanation

Fig. 1 is entire system block diagram.

Fig. 2 is A phase drive circuit figure.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described:

The utility model comprises FPGA control chip 1, optical coupling isolation circuit 2, power amplification circuit 3, H-bridge drive circuit 4 and current protecting circuit 5 as shown in Figure 1.FPGA control chip 1, optical coupling isolation circuit 2, power amplification circuit 3 and H-bridge drive circuit 4 are linked in sequence, and then access stepping motor, and current protecting circuit 5 are being connected to form a closed loop circuit with stepping motor and FPGA control chip 1 respectively.

In this system, most important parts are exactly FPGA control chip 1, it is the core component that whole system is achieved, after control end sends relevant parameter and order to FPGA control chip 1, namely FPGA control chip 1 exports the input of corresponding current signal to stepping motor, thus reaches the effect controlling motor.The FPGA control chip 1 that native system adopts be EP2C8Q208C8N, and this fpga chip belongs to middle and small scale device, and its size to fit, stability are high and can the feature such as reprovision be all its reason of selection.

The Main Function of optical coupling isolation circuit 2 is that protective circuit is not by electromagnetic interference influence; due to the low-voltage that FPGA control chip 1 exports; and drive circuit is high voltage; so in running; the interphase interaction of high-low pressure can produce the phenomenon of electromagnetic interference; the signal of telecommunication of input can be converted to light signal by light-emitting diode after adding optical coupling isolation circuit 2, then be converted to signal of telecommunication output by the photodiode of output, so just can ensure that system can not by electromagnetic interference influence.Optical coupling isolation circuit 2 we adopt be light-coupled isolation chip HCPL2630.

Power amplification circuit 3 effect in systems in which mainly controls the amplification of power, and what we adopted is IR2110 chip, and it has the features such as on-off effect is rapid, structure is simple, just required for our system.

In Hybrid stepping motor, the biphase current due to it is forward and reverse electric current, so need H-bridge drive circuit 4 to realize.

The effect of current protecting circuit 5 prevents that the input current of stepping motor is excessive burns out motor; what we adopted is that LM393 voltage comparator realizes; when input voltage is greater than the safe voltage of setting; comparator then exports a signal to control end, and the power supply cutting off whole system prevents burn-down of electric motor.

In A phase drive circuit figure as shown in Figure 2, PWM_ah and PWM_al enters from the pin 1 of the HCPL2630 of chip and pin 2, after the opto-electronic conversion of chip HCPL2630 inside, from signal HIN and LIN of pin 6 and pin 7 stable output, access pin 10 and the pin 12 of driving chip IR2110 respectively, after IR2110 circuit power amplifies, LO and HO exports from pin 1 and pin 7 driving voltage being used as H-bridge circuit respectively, when LO exports from pin 7, the break-make of M2 and M3 of transistor IRF530 can be controlled, when HO exports from pin 1, the break-make of M1 and M4 of transistor IRF530 can be controlled, the AH exported, AL signal connects the A phase of motor, thus reach the object of segmentation.

1 pin of light-coupled isolation chip HCPL2630 connects the high level of AH of FPGA as shown in Figure 2,2 low levels meeting the AL of FPGA, the equal ground connection of pin 3 and 4, pin 5,8 have all accessed the electric capacity that a size is 0.1 μ F, and in order to prevent interference, 6 are connected with the filter capacitor of 15pF respectively with 7.

The electric capacity of 104p and 105p is added as shown in Figure 2 respectively between the pin 2 and 3 of power amplifier chip IR2110, pin 9 and 13; and the effect of diode between pin 2 and pin 5 when being to prevent conducting electric current cross conference and burn chip; play the effect of protection; pin 1 is also the effect playing a current limliting with R3 and R5 that pin 7 is connected simultaneously; electric capacity C3 between pin 5,6 is a bootstrap capacitor; C3 can produce power supply between pin 5,6, for pin 7 provides voltage.In order to the output signal HIN of 6 pin and 7 pin that make HCPL2630 and LIN is effective, we access a low-voltage also must to 11 pin, when 10 pins access high level and 12 pin access low level time, pin 7 exports high level, pin 1 output low level.

As shown in Figure 2, in H-bridge circuit, the input HO of upper level, LO are as two inputs of H bridge, and AH, AL are two outputs connecting motor A phase.At SPWM ripple within the scope of 0 ~ π, the conducting of M2 and M3 of input HO control MOSFET and by, the sense of current is now power supply-M2- -M3-ground; When SPWM ripple is within the scope of the π of π ~ 2, the conducting of M1 and M4 of input LO control MOSFET and by, the sense of current is now power supply-M1- -M4-ground, so within the cycle of whole sinusoidal signal, H-bridge circuit just controls the electric current of output, makes it change sinusoidally, thus drives A, B phase winding.

The above; it is only preferred embodiment of the present utility model; not do any type of restriction to the utility model, those skilled in the art utilizes the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drops in protection range of the present utility model.

Claims

1. a micro-stepping driving of stepping motor system; comprise FPGA control chip, optical coupling isolation circuit, power amplification circuit, H-bridge drive circuit and current protecting circuit; it is characterized in that: described FPGA control chip, described optical coupling isolation circuit, described power amplification circuit and described H-bridge drive circuit are linked in sequence; then access stepping motor, and described current protecting circuit is being connected to form a closed loop circuit with stepping motor and described FPGA control chip respectively.

2. a kind of micro-stepping driving of stepping motor system according to claim 1, is characterized in that: what described FPGA control chip adopted is EP2C8Q208C8N chip.

3. a kind of micro-stepping driving of stepping motor system according to claim 1, is characterized in that: what described optical coupling isolation circuit adopted is HCPL2630 chip.

4. a kind of micro-stepping driving of stepping motor system according to claim 1, is characterized in that: what described power amplification circuit adopted is IR2110 chip.

5. a kind of micro-stepping driving of stepping motor system according to claim 1, is characterized in that: what described current protecting circuit adopted is that LM393 voltage comparator realizes.