CN110518843B - Stepping motor driving circuit of linear cutting control system - Google Patents
Stepping motor driving circuit of linear cutting control system Download PDFInfo
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- CN110518843B CN110518843B CN201910887272.0A CN201910887272A CN110518843B CN 110518843 B CN110518843 B CN 110518843B CN 201910887272 A CN201910887272 A CN 201910887272A CN 110518843 B CN110518843 B CN 110518843B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P8/00—Arrangements for controlling dynamo-electric motors of the kind having motors rotating step by step
- H02P8/12—Control or stabilisation of current
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Abstract
A stepping motor driving circuit of a linear cutting control system. Relates to a linear cutting control system, in particular to a stepping motor driving circuit of the linear cutting control system. A stepping motor driving circuit of a wire cutting control system is provided which maintains a rated value of a current of a conducting phase winding regardless of whether the motor is in a locked state or an operating state. The device comprises a stepping motor pulse enabling circuit, a stepping motor driving and chopping circuit, a full-current working and half-current locking current control circuit and a micro-control unit; one end of the resistor R70 is electrically connected with one end of the diode D70, and the other end of the resistor R70 is connected between the hysteresis comparator U4 and the resistor R7; the other end of the diode is connected between the field effect transistor Q1 and the resistor R6. The invention has the characteristics of compact and reasonable structure, stable performance, keeping the rated value of the current of the conducting phase winding in both the locking state and the running state, and the like.
Description
Technical Field
The invention relates to a linear cutting control system, in particular to a stepping motor driving circuit of the linear cutting control system.
Background
The existing fast wire cutting control system mostly adopts a stepping motor to drive X, Y, U, V shafts, a X, Y, U, V-shaft stepping motor driving power supply generally adopts a 24V direct current power supply to supply power, the open loop control is realized, the system control is simple, and the cost is low.
In actual operation, if the stepping motor is operated at a high speed, the influence of the electrical time constant increases significantly: during conduction, the current cannot rise rapidly to the nominal value; during the off period, the winding current cannot immediately vanish. Thus, the torque produced by the motor is significantly reduced. In addition, the excitation winding may generate a high back electromotive force at the off-time, and if no measures are taken, the switching element may be damaged. For these problems, there are generally the following requirements for the driving circuit:
(1) The rising and falling edges of the current waveform can be improved, resulting in a nearly rectangular current waveform. Considering the factors of simple circuit, low cost and the like, the low-power stepping motor can reduce the time constant and widen the working frequency range through the series current limiting resistor. However, in order to maintain the phase current rating when the motor is stationary, the supply voltage must be increased, and thus the required dc supply capacity is relatively large. When the motor is stationary, a major part of the power output is consumed by the series current limiting resistor, and heat generated by the current limiting resistor must be rapidly dissipated, otherwise problems may occur. It follows that a simple series current limiting resistor is an inefficient method of improving the speed range. For high-power or higher-power stepper motors, high-low voltage or chopper drive is often used. These driving methods are complicated, but have good driving characteristics and high efficiency.
(2) And a loop for releasing current energy in the cut-off period is arranged, so that counter potential generated at two ends of the winding is reduced, and current attenuation is accelerated.
(3) The power consumption of the driving circuit is required to be low and the efficiency to be high.
Disclosure of Invention
The present invention is directed to the above problems, and provides a stepping motor driving circuit of a wire cutting control system which maintains a rated value of a current of a conducting phase winding regardless of whether the motor is in a locked state or an operating state.
The technical scheme of the invention is as follows: the device comprises a stepping motor pulse enabling circuit, a stepping motor driving and chopping circuit, a full-current working and half-current locking current control circuit and a micro-control unit;
The pulse enabling circuit of the stepping motor comprises a capacitor C1, an optical coupler U1, a resistor R2, a resistor R3, an inverter U2 and a resistor R4;
A connecting end of the optical coupler U1 is electrically connected with a stepping motor A phase driving pulse signal end through a resistor R1;
the two connecting ends of the optical coupler U1 are in telecommunication connection with a driving enabling signal end of the stepping motor A;
one end of the capacitor C1 is connected between the phase A driving pulse signal end of the stepping motor and the optical coupler U1, and the other end of the capacitor C is connected between the phase A driving enabling signal end of the stepping motor and the optical coupler U1;
the three connection ends of the optical coupler U1 are grounded;
the four connecting ends of the optical coupler U1 are electrically connected with one connecting end of the inverter U2 through a resistor R3;
The two connecting ends of the inverter U2 are electrically connected with the stepping motor drive and chopper circuit;
one end of the resistor R2 is connected between the resistor R3 and the optical coupler U1, and the other end of the resistor R2 is connected with a power supply;
one end of the resistor R4 is connected between the inverter U2 and the stepping motor driving and chopping circuit, and the other end of the resistor R is connected with a power supply;
the stepping motor driving and chopping circuit comprises a gate U3, a resistor R5, a field effect transistor Q1, a freewheeling diode D0, a hysteresis comparator U4, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R16 and a capacitor C2;
The gate U3, the resistor R5 and the field effect transistor Q1 are electrically connected in sequence;
A connection end of the gate U3 is electrically connected with two connection ends of the inverter U2;
The drain electrode of the field effect transistor Q1 is electrically connected with a working power supply through a stepping motor winding r 1;
the freewheeling diode D0 is connected in parallel with two ends of the stepping motor winding r 1;
two connecting ends of the hysteresis comparator U4 are electrically connected with one end of the resistor R7, and the other end of the hysteresis comparator U is electrically connected with the source electrode of the field effect transistor Q1;
One end of the resistor R6 is electrically connected with the source electrode of the field effect transistor Q1, and the other end of the resistor R is grounded;
One end of the capacitor C2 is connected between the delay comparator U4 and the resistor R7, and the other end of the capacitor C is grounded;
One end of the resistor R8 is electrically connected with the three connecting ends of the hysteresis comparator U4, and the other end of the resistor R8 is electrically connected with the full-current working and half-current locking current control circuit and the micro-control unit;
One connection end of the hysteresis comparator U4 and one end of the resistor R9 are respectively and electrically connected with a second pin of the gate U3; the other end of the resistor R9 is connected between the delay comparator U4 and the resistor R8;
The V2 connecting end of the micro control unit is electrically connected with a connecting end of the hysteresis comparator U4, one end of the resistor R16 is electrically connected between the V2 connecting end and the hysteresis comparator U4, and the other end of the resistor R16 is connected with a power supply;
the V0 connecting end of the micro control unit is connected between the resistor R3 and the inverter U2;
the full-current working and half-current locking current control circuit comprises a resistor R15, a diode D1, a resistor R14, a capacitor C4, a resistor R12, a resistor R13, an operational amplifier U5, a resistor R10, a resistor R11 and a capacitor C3;
The V1 connecting end of the micro control unit is connected with a pin III of the operational amplifier U5 in series through a diode D1 and a resistor R14 in sequence;
one end of the resistor R15 is connected between the diode D1 and the micro-control unit, and the other end of the resistor R is connected with a power supply;
One end of the resistor R12 is connected between the resistor R14 and the comparator U5, and the other end of the resistor R is connected with a power supply;
one end of the resistor R13 is connected between the resistor R14 and the comparator U5, and the other end of the resistor R is grounded;
one end of the capacitor C4 is connected between the resistor R14 and the comparator U5, and the other end of the capacitor C is grounded;
the first pin of the comparator U5 is grounded through a resistor R10 and a resistor R11 which are sequentially connected in series;
The second pin of the comparator U5 is connected between the first pin of the comparator U5 and the resistor R10;
The capacitor C3 is connected in parallel with two ends of the resistor R11;
The resistor R8 is electrically connected with the capacitor C3.
The inverter U2 is of the type 74HC14D.
The stepping motor driving and chopping circuit further comprises a resistor R70 and a diode D70 which are sequentially connected in series;
One end of the resistor R70 is electrically connected with one end of the diode D70, and the other end of the resistor R70 is connected between the hysteresis comparator U4 and the resistor R7;
the other end of the diode is connected between the field effect transistor Q1 and the resistor R6.
The negative terminal of the diode D70 is electrically connected to the resistor R70.
The positive terminal of the diode D70 is electrically connected to the resistor R70.
The invention comprises a stepping motor pulse enabling circuit, a stepping motor driving and chopping circuit, a full-current working and half-current locking current control circuit and a micro-control unit; the stepping motor is driven by adopting a chopping constant-current driving mode, and the current of the conducting phase winding is kept to be rated value through ingenious circuit design no matter the motor is in a locking state or in an operating state. Meanwhile, the problem that the actual stepping motor driving current is larger or smaller due to the fact that the stepping motor driving pulse parameters of different single-board machine manufacturers are inconsistent is solved. The invention has the characteristics of compact and reasonable structure, stable performance, keeping the rated value of the current of the conducting phase winding in both the locking state and the running state, and the like.
Drawings
Figure 1 is a schematic diagram of the operation of the a-phase drive circuit of the stepper motor of the present invention,
Figure 2 is an enlarged schematic circuit diagram of the pulse enable circuit of the stepper motor of figure 1,
Figure 3 is an enlarged schematic diagram of the stepper motor drive and chopper circuit of figure 1,
Figure 4 is an enlarged schematic diagram of the full current operation and half current lock-in current control circuit of figure 1,
Figure 5 is a schematic diagram of a circuit for reducing the output current of a stepper motor,
FIG. 6 is a schematic diagram of a circuit for increasing the output current of a stepper motor;
in the figure, 1 is a stepping motor pulse enabling circuit, 2 is a stepping motor driving and chopping circuit, and 3 is a full-current working and half-current locking current control circuit.
Detailed Description
The invention is as shown in figures 1-6, comprising a stepping motor pulse enabling circuit 1, a stepping motor driving and chopping circuit 2, a full-current working and half-current locking current control circuit 3 and a micro-control unit;
The stepping motor pulse enabling circuit 1 comprises a capacitor C1, an optical coupler U1, a resistor R2, a resistor R3, an inverter U2 and a resistor R4;
A connecting end of the optical coupler U1 is electrically connected with a stepping motor A phase driving pulse signal end through a resistor R1;
the two connecting ends of the optical coupler U1 are in telecommunication connection with a driving enabling signal end of the stepping motor A;
one end of the capacitor C1 is connected between the phase A driving pulse signal end of the stepping motor and the optical coupler U1, and the other end of the capacitor C is connected between the phase A driving enabling signal end of the stepping motor and the optical coupler U1;
the three connection ends of the optical coupler U1 are grounded;
the four connecting ends of the optical coupler U1 are electrically connected with one connecting end of the inverter U2 through a resistor R3;
The two connecting ends of the inverter U2 are electrically connected with the stepping motor drive and chopper circuit;
one end of the resistor R2 is connected between the resistor R3 and the optical coupler U1, and the other end of the resistor R2 is connected with a power supply;
one end of the resistor R4 is connected between the inverter U2 and the stepping motor driving and chopping circuit, and the other end of the resistor R is connected with a power supply;
In fig. 1, the pulse enable circuit of the stepper motor controls the input of control pulses and pulse shaping of the phase a of the stepper motor. And when the phase of the A phase of the stepping motor is out of phase, prohibiting the control pulse of the A phase of the stepping motor from being acted.
The stepping motor driving and chopping circuit 2 comprises a gate U3, a resistor R5, a field effect transistor Q1, a freewheeling diode D0, a hysteresis comparator U4, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R16 and a capacitor C2;
The gate U3, the resistor R5 and the field effect transistor Q1 are electrically connected in sequence;
A connection end of the gate U3 is electrically connected with two connection ends of the inverter U2;
The drain electrode of the field effect transistor Q1 is electrically connected with a working power supply through a stepping motor winding r 1;
the freewheeling diode D0 is connected in parallel with two ends of the stepping motor winding r 1;
two connecting ends of the hysteresis comparator U4 are electrically connected with one end of the resistor R7, and the other end of the hysteresis comparator U is electrically connected with the source electrode of the field effect transistor Q1;
One end of the resistor R6 is electrically connected with the source electrode of the field effect transistor Q1, and the other end of the resistor R is grounded;
One end of the capacitor C2 is connected between the delay comparator U4 and the resistor R7, and the other end of the capacitor C is grounded;
One end of the resistor R8 is electrically connected with the three connecting ends of the hysteresis comparator U4, and the other end of the resistor R8 is electrically connected with the full-current working and half-current locking current control circuit and the micro-control unit;
One connection end of the hysteresis comparator U4 and one end of the resistor R9 are respectively and electrically connected with a second pin of the gate U3; the other end of the resistor R9 is connected between the delay comparator U4 and the resistor R8;
The V2 connecting end of the micro control unit is electrically connected with a connecting end of the hysteresis comparator U4, one end of the resistor R16 is electrically connected between the V2 connecting end and the hysteresis comparator U4, and the other end of the resistor R16 is connected with a power supply;
the V0 connecting end of the micro control unit is connected between the resistor R3 and the inverter U2;
in FIG. 1, a stepping motor driving and chopping circuit controls the on-off of a phase A of the stepping motor and current chopping. When the phase A control pulse of the stepping motor acts, current is generated in the phase A of the stepping motor, the phase A of the stepping motor acts, the current of the phase A is sampled through a current sampling resistor R6, and a U4 comparator is responsible for current chopping.
The full current operation and half current locking current control circuit 3 comprises a resistor R15, a diode D1, a resistor R14, a capacitor C4, a resistor R12, a resistor R13, an operational amplifier U5, a resistor R10, a resistor R11 and a capacitor C3
The V1 connecting end of the micro control unit is connected with a pin III of the operational amplifier U5 in series through a diode D1 and a resistor R14 in sequence;
one end of the resistor R15 is connected between the diode D1 and the micro-control unit, and the other end of the resistor R is connected with a power supply;
one end of the resistor R12 is connected between the resistor R14 and the operational amplifier U5, and the other end of the resistor R is connected with a power supply;
One end of the resistor R13 is connected between the resistor R14 and the operational amplifier U5, and the other end of the resistor R is grounded;
one end of the capacitor C4 is connected between the resistor R14 and the operational amplifier U5, and the other end of the capacitor C is grounded;
the first pin of the comparator U5 is grounded through a resistor R10 and a resistor R11 which are sequentially connected in series;
the second pin of the comparator U5 is connected between the first pin of the operational amplifier U5 and the resistor R10;
The capacitor C3 is connected in parallel with two ends of the resistor R11;
The resistor R8 is electrically connected with the capacitor C3.
In fig. 1, the full current operation and half current locking current control circuit controls whether the stepper motor is in a normal driving state or in a half current locking state. When the stepping motor normally drives the machine tool to work, the stepping motor outputs full current, and V1 in FIG. 1 outputs high level at the moment; when the corresponding shaft of the machine tool is in a suspended state, in order to avoid offset, the stepping motor must be in an enabled state to output a certain current so as to avoid the displacement of the shaft caused by external force or gravity, and then V1 outputs a low level. The specific full current operation and the half current locking current are determined by R8-R14, and the current in the general locking state is about half of the normal driving operation current, so the current is commonly called half current locking.
Fig. 1 is a schematic diagram of the operation of a phase a drive circuit of a stepper motor. CTR_A is a stepping motor A phase driving pulse signal, CTR_0 is a stepping motor A phase driving enabling signal. When ctr_0 is high, the stepping motor a phase driving pulse signal ctr_a is inhibited from being applied. When CTR_0 is at a low level, the phase drive pulse signal CTR_A of the stepping motor A is allowed to act, the output end 4 pin of the optical coupler U1 outputs the inverted pulse of the control pulse, and the optical coupler U1 plays an isolating role. The inversion pulse outputs a pulse signal in phase with the start a-phase drive pulse signal ctr_a via an inverter U2, which uses 74HC14D and shapes the input pulse in addition to inverting the signal. The pulse signal output by the inverter U2 is sent to the pin 1 of the input end of the AND gate U3, when the pin 2 of the input end of the AND gate U3 is in a high level, the pin 3 of the output end of the AND gate U3 outputs a stepping motor A phase driving pulse signal, and the field effect transistor Q1 is driven to work through the resistor R5. In fig. 1, r1 is a stepping motor winding, D0 is a freewheeling diode, and 24V is a stepping motor operating power supply. When the A-phase driving pulse signal of the stepping motor is at a high level, the field effect transistor Q1 is conducted, and the A-phase winding r1 of the stepping motor is electrified; on the contrary, when the phase A driving pulse signal of the stepping motor is at a low level, the field effect transistor Q1 is cut off, and the phase A winding r1 of the stepping motor has no current. R6 is a sampling resistor, and the current of the phase winding R1 of the stepping motor A is fed into the inverting input end of the comparator U4 after passing through a first-order RC filter formed by the resistor R7 and the capacitor C2 in a voltage mode.
V0 is normally set as an input port of the MCU, when the MCU detects that the stepping motor A is out of phase, V0 is converted into an output port of the MCU, and a high level is output, so that the output of a stepping motor driving pulse signal is blocked.
V1 is set as an output port of the MCU, and when the stepping motor works normally 13: when the output of V1 is low, the stepping motor is in a half-current locking state; when the V1 output is high, the stepping motor is in a driving working state. The specific analysis is as follows:
When the V1 output is at a low level, V4＝V3＝0.5V。
At this time, the upper limit flip level V8 of the hysteresis comparator U4: Namely: /(I) V8＝0.2V。
The lower limit flip level V8 of the hysteresis comparator U4: Namely: /(I) V8＝0.1V。
This is:
when the V1 output is at a high level, Namely: /(I)V3＝1.9V。
V4＝V3＝1.9V。
At this time, the upper limit flip level V8 of the hysteresis comparator U4: Namely: /(I) V8＝0.4V。
The lower limit flip level V8 of the hysteresis comparator U4: Namely: /(I) V8＝0.3V。
The frequency of the stepper motor drive pulse signal CTR_A is typically within 500Hz, i.e. 2000 μs. The time constant of the first-order RC filter formed by the resistor R7 and the capacitor C2 is as follows: r7c2=10× 3×4.7×10-9 =47 μs. Therefore, during the high level of the driving pulse signal ctr_a of the stepper motor, the driving pulse signal is chopped into a plurality of sub-pulse signals by the comparator U4, the input terminal 2 of the and gate U3 is supplied through the output terminal 1 of the comparator U4, and the input terminal 1 of the and gate U3 is at the high level, so that the sub-pulse signals drive the stepper motor through the resistor R5 via the output terminal 3 of the and gate U3. During the high level of the step motor driving pulse signal ctr_a, the input terminal 1 pin of the and gate U3 is low, so the output terminal 3 of the and gate U3 is always low, and no step motor driving pulse signal is generated. At this time, the inverting input terminal 2 pin of the comparator U4 is 0, and therefore the output terminal 1 of the comparator U4 is high.
V2 is set as the input port of the MCU. According to the above analysis, during the high level of the stepping motor driving pulse signal ctr_a, the output terminal 1 pin of the comparator U4 will have the sub pulse signal present. However, when the phase is lost, since V6 is always 0, the output terminal 1 of the comparator U4 is always at a high level, so that the MCU can determine that the motor is lost, convert V0 into the output port of the MCU, and output a high level, thereby blocking the output of the stepping motor driving pulse signal.
The inverter U2 is of the type 74HC14D. In addition to inverting the signal, the input pulse can be shaped.
The fast wire cutting control system is generally produced and sold by each manufacturer, the driving pulse signals of the stepping motor come from the main control system, the pulse frequency and the like of the driving pulse signals are not controlled by the fast wire cutting control system, and the driving pulse signals of the stepping motors of the manufacturers of the main control system are output differently. Therefore, in the practical application process, the situation that the output current is larger or smaller may occur when the stepping motor driving circuit is simply used. Accordingly, the present invention further improves the above-described driving circuit.
The stepping motor driving and chopping circuit further comprises a resistor R70 and a diode D70 which are sequentially connected in series;
One end of the resistor R70 is electrically connected with one end of the diode D70, and the other end of the resistor R70 is connected between the hysteresis comparator U4 and the resistor R7;
the other end of the diode is connected between the field effect transistor Q1 and the resistor R6.
The negative terminal of the diode D70 is electrically connected to the resistor R70.
The positive terminal of the diode D70 is electrically connected to the resistor R70.
Fig. 2 and 3 are an improved circuit for reducing the output current of the stepper motor and an improved circuit for increasing the output current of the stepper motor, respectively. When the circuit board is designed, the positions of D70 and R70 are reserved, and repair welding components are changed according to the need if the improvement is needed.
Fig. 2 is an improved circuit for reducing the output current of a stepper motor. Compared with the circuit of fig. 1, a resistor R70 and a diode D70 are added, the anode of the diode D70 is connected with the source electrode of the field effect transistor Q1, and the cathode of the diode D70 is connected with the resistor R70. When the fet Q1 is turned on, the capacitor C2 is charged by the current R7// R70, where R7// R70 is 10// 10=5Ω, and thus the time for charging to the inverting voltage of the comparator U4 is greatly shortened. When the fet Q1 is turned off, the voltage on the capacitor C2 still discharges only through the resistors R7 and R6, compared to the circuit of fig. 1, due to the reverse turn-off characteristic of the diode D70. Therefore, the duty ratio of the output drive pulse becomes smaller, and the stepping motor drive current becomes smaller. In the actual process, the resistance values of the resistors R7 and R70 can be adjusted according to specific conditions.
Fig. 3 is an improved circuit for increasing the output current of a stepper motor. Compared with the circuit of fig. 1, a resistor R70 and a diode D70 are added, the cathode of the diode D70 is connected with the source electrode of the field effect transistor Q1, and the anode of the diode D70 is connected with the resistor R70. When the fet Q1 is turned on, the reverse turn-off characteristic of the diode D70 still charges the capacitor C2 through R7, and thus the time to charge the inverting voltage of the comparator U4 is greatly shortened. When the fet Q1 is turned off, the voltage on the capacitor C2 is discharged through the resistors R7// R70 and R6, with R7// R70 being 10// 10=5Ω, compared to the circuit of fig. 1, due to the forward conduction characteristic of the diode D70. Therefore, the duty ratio of the output drive pulse becomes large, and the stepping motor drive current becomes small. In the actual process, the resistance values of the resistors R7 and R70 can be adjusted according to specific conditions.
In conclusion, the invention solves the problem that the actual stepping motor driving current is larger or smaller due to inconsistent stepping motor driving pulse parameters of different single board machine manufacturers.
The model of the micro control unit is STM8GC104R8.
For the purposes of this disclosure, the following points are also described:
(1) The drawings of the embodiments disclosed in the present application relate only to the structures related to the embodiments disclosed in the present application, and other structures can refer to common designs;
(2) The embodiments disclosed herein and features of the embodiments may be combined with each other to arrive at new embodiments without conflict;
the above is only a specific embodiment disclosed in the present application, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. The stepping motor driving circuit of the linear cutting control system is characterized by comprising a stepping motor pulse enabling circuit, a stepping motor driving and chopping circuit, a full-current working and half-current locking current control circuit and a micro control unit;
The pulse enabling circuit of the stepping motor comprises a capacitor C1, an optical coupler U1, a resistor R2, a resistor R3, an inverter U2 and a resistor R4;
A connecting end of the optical coupler U1 is electrically connected with a stepping motor A phase driving pulse signal end through a resistor R1;
the two connecting ends of the optical coupler U1 are in telecommunication connection with a driving enabling signal end of the stepping motor A;
one end of the capacitor C1 is connected between the phase A driving pulse signal end of the stepping motor and the optical coupler U1, and the other end of the capacitor C is connected between the phase A driving enabling signal end of the stepping motor and the optical coupler U1;
the three connection ends of the optical coupler U1 are grounded;
the four connecting ends of the optical coupler U1 are electrically connected with one connecting end of the inverter U2 through a resistor R3;
The two connecting ends of the inverter U2 are electrically connected with the stepping motor drive and chopper circuit;
one end of the resistor R2 is connected between the resistor R3 and the optical coupler U1, and the other end of the resistor R2 is connected with a power supply;
one end of the resistor R4 is connected between the inverter U2 and the stepping motor driving and chopping circuit, and the other end of the resistor R is connected with a power supply;
the stepping motor driving and chopping circuit comprises a gate U3, a resistor R5, a field effect transistor Q1, a freewheeling diode D0, a hysteresis comparator U4, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R16 and a capacitor C2;
The gate U3, the resistor R5 and the field effect transistor Q1 are electrically connected in sequence;
A connection end of the gate U3 is electrically connected with two connection ends of the inverter U2;
The drain electrode of the field effect transistor Q1 is electrically connected with a working power supply through a stepping motor winding r 1;
the freewheeling diode D0 is connected in parallel with two ends of the stepping motor winding r 1;
two connecting ends of the hysteresis comparator U4 are electrically connected with one end of the resistor R7, and the other end of the hysteresis comparator U is electrically connected with the source electrode of the field effect transistor Q1;
One end of the resistor R6 is electrically connected with the source electrode of the field effect transistor Q1, and the other end of the resistor R is grounded;
One end of the capacitor C2 is connected between the delay comparator U4 and the resistor R7, and the other end of the capacitor C is grounded;
One end of the resistor R8 is electrically connected with the three connecting ends of the hysteresis comparator U4, and the other end of the resistor R8 is electrically connected with the full-current working and half-current locking current control circuit and the micro-control unit;
One connection end of the hysteresis comparator U4 and one end of the resistor R9 are respectively and electrically connected with a second pin of the gate U3; the other end of the resistor R9 is connected between the delay comparator U4 and the resistor R8;
The V2 connecting end of the micro control unit is electrically connected with a connecting end of the hysteresis comparator U4, one end of the resistor R16 is electrically connected between the V2 connecting end and the hysteresis comparator U4, and the other end of the resistor R16 is connected with a power supply;
the V0 connecting end of the micro control unit is connected between the resistor R3 and the inverter U2;
The full current working and half current locking current control circuit comprises a resistor R15, a diode D1, a resistor R14, a capacitor C4, a resistor R12, a resistor R13, an operational amplifier U5, a resistor R10, a resistor R11 and a capacitor C3
The V1 connecting end of the micro control unit is connected with a pin III of the operational amplifier U5 in series through a diode D1 and a resistor R14 in sequence;
one end of the resistor R15 is connected between the diode D1 and the micro-control unit, and the other end of the resistor R is connected with a power supply;
One end of the resistor R12 is connected between the resistor R14 and the comparator U5, and the other end of the resistor R is connected with a power supply;
one end of the resistor R13 is connected between the resistor R14 and the comparator U5, and the other end of the resistor R is grounded;
one end of the capacitor C4 is connected between the resistor R14 and the comparator U5, and the other end of the capacitor C is grounded;
the first pin of the comparator U5 is grounded through a resistor R10 and a resistor R11 which are sequentially connected in series;
The second pin of the comparator U5 is connected between the first pin of the comparator U5 and the resistor R10;
The capacitor C3 is connected in parallel with two ends of the resistor R11;
The resistor R8 is electrically connected with the capacitor C3.
2. The stepping motor driving circuit for a wire cutting control system according to claim 1, wherein said inverter U2 is of a type 74HC14D.
3. The stepping motor driving circuit of a linear cutting control system according to claim 1, wherein the stepping motor driving and chopping circuit further comprises a resistor R70 and a diode D70 connected in series in sequence;
One end of the resistor R70 is electrically connected with one end of the diode D70, and the other end of the resistor R70 is connected between the hysteresis comparator U4 and the resistor R7;
the other end of the diode is connected between the field effect transistor Q1 and the resistor R6.
4. The stepping motor driving circuit of a linear cutting control system according to claim 1, wherein the negative terminal of the diode D70 is electrically connected to the resistor R70.
5. The stepping motor driving circuit of a linear cutting control system according to claim 1, wherein the positive terminal of the diode D70 is electrically connected to the resistor R70.
6. The stepping motor driving circuit of a wire cutting control system according to claim 1, wherein the micro control unit is STM8GC104R8.
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| CN201910887272.0A CN110518843B (en) | 2019-09-19 | 2019-09-19 | Stepping motor driving circuit of linear cutting control system |
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| CN201910887272.0A CN110518843B (en) | 2019-09-19 | 2019-09-19 | Stepping motor driving circuit of linear cutting control system |
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| CN110518843B true CN110518843B (en) | 2024-05-03 |
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|---|---|---|---|---|
| US5767589A (en) * | 1996-09-03 | 1998-06-16 | Maximum Products Inc. | Lighting control circuit for vehicle brake light/tail light/indicator light assembly |
| CN108919139A (en) * | 2018-06-11 | 2018-11-30 | 扬州万泰电子科技有限公司 | One kind having resistance pulse power wire cutting clearance discharge condition detection circuit |
| CN208971424U (en) * | 2018-10-11 | 2019-06-11 | 上海四横电机制造有限公司 | A kind of stepper motor driving circuit |
| CN210167990U (en) * | 2019-09-19 | 2020-03-20 | 扬州万泰电子科技有限公司 | Stepping motor driving circuit of linear cutting control system |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5767589A (en) * | 1996-09-03 | 1998-06-16 | Maximum Products Inc. | Lighting control circuit for vehicle brake light/tail light/indicator light assembly |
| CN108919139A (en) * | 2018-06-11 | 2018-11-30 | 扬州万泰电子科技有限公司 | One kind having resistance pulse power wire cutting clearance discharge condition detection circuit |
| CN208971424U (en) * | 2018-10-11 | 2019-06-11 | 上海四横电机制造有限公司 | A kind of stepper motor driving circuit |
| CN210167990U (en) * | 2019-09-19 | 2020-03-20 | 扬州万泰电子科技有限公司 | Stepping motor driving circuit of linear cutting control system |
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| 一种实用的步进电机驱动电路;刘炜;;宁夏工程技术;20060315(第01期);全文 * |
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