Stepping driver circuit and stepping driver

Abstract

The utility model relates to a stepping driver circuit and a stepping driver, and the stepping driver circuit comprises a driving circuit which is used for driving a motor to rotate; the input end of the feedback loop is connected with the output end of the driving circuit, and the feedback loop is used for collecting the running state of the driving circuit and outputting a corresponding pulse signal; and the first controlled end of the step-down circuit is connected with the output end of the driving circuit, the control end of the step-down circuit is connected with the output end of the feedback loop, and the step-down circuit is used for reducing the voltage after peak rectification of the voltage output by the driving circuit under the driving of the pulse signal. According to the technical scheme of the utility model, a high-power resistor is replaced by the step-down circuit, so that the problem of heating of the high-power resistor can be avoided under the condition that the voltage of the MOS tube is effectively clamped.

Description

Technical Field

[0001] The present application relates to the field of driver technology, and in particular to a stepper driver circuit and a stepper driver. Background Art

[0002] In a two-phase six-wire stepper driver, when the lower tube is in the off state, there is no freewheeling loop under some working conditions, which leads to higher drain and source voltages of the MOS tube, and may also cause electromagnetic interference problems, further affecting the performance and stability of the motor.

[0003] In order to reduce the voltage and prevent excessive voltage from damaging the MOS tube and affecting the performance and stability of the motor, the existing technology often uses high-power resistors to discharge the voltage spikes of the MOS tube. However, this method will cause the resistor to heat up seriously. At the same time, more high-power devices will also make the driver larger. Utility Model Content

[0004] The main purpose of the utility model is to provide a stepper driver circuit, aiming to solve the technical problems that the prior art uses high-power resistors to discharge voltage spikes of MOS tubes in stepper drivers, which will cause serious heating of the resistors and make the driver larger in size.

[0005] To achieve the above object, the stepper driver circuit proposed by the utility model includes:

[0006] A driving circuit, wherein the driving circuit is used to drive the motor to rotate;

[0007] A feedback loop, wherein the input end of the feedback loop is connected to the output end of the driving circuit, and the feedback loop is used to collect the operating state of the driving circuit and output a corresponding pulse signal;

[0008] A step-down circuit, wherein the first controlled end of the step-down circuit is connected to the output end of the driving circuit, the control end of the step-down circuit is connected to the output end of the feedback loop, and the step-down circuit is used to reduce the voltage after rectification of the voltage spike output by the driving circuit under the drive of the pulse signal.

[0009] In one embodiment, the feedback loop includes:

[0010] A detection circuit, wherein an input end of the detection circuit is connected to an output end of the drive circuit, and the detection circuit is used to collect an operating state of the drive circuit and output a corresponding voltage signal;

[0011] A pulse generating circuit, wherein the input end of the pulse generating circuit is connected to the output end of the detection circuit, the output end of the pulse generating circuit is connected to the control end of the step-down circuit, and the pulse generating circuit is used to output a corresponding pulse driving signal according to a voltage signal.

[0012] In one embodiment, the detection circuit comprises:

[0013] a first diode, wherein a first resistor is connected between a cathode of the first diode and an output terminal of the driving circuit, and a second diode is connected between an anode of the first diode and ground;

[0014] a first switch element, wherein a control terminal of the first switch element is connected to a common node of the first diode and the second diode, and a second resistor is connected between the control terminal and the second controlled terminal of the first switch element;

[0015] A second switch element, wherein the control end of the second switch element is connected to the first controlled end of the first switch element, a third resistor is connected between the control end and the first controlled end of the second switch element, and the second controlled end of the second switch element is connected to the input end of the pulse generating circuit.

[0016] In one embodiment, the pulse generating circuit comprises:

[0017] A pulse chip, wherein at least one capacitor is connected between a control terminal of the pulse chip and ground, and a reset terminal of the pulse chip is connected to an output terminal of the detection circuit;

[0018] A fifth resistor, a fourth resistor is connected between a first end of the fifth resistor and the output end of the detection circuit, a common node of the fourth resistor and the fifth resistor is connected to a discharge end of the pulse chip, a first capacitor is connected between the fifth resistor and the ground, and a common node of the fifth resistor and the first capacitor is connected to a trigger end;

[0019] A third switch element, wherein a control end of the third switch element is connected to the driving output end of the pulse chip, and a second controlled end of the third switch element is grounded;

[0020] A fourth switch element, wherein the control end of the fourth switch element is connected to the first controlled end of the third switch element, a sixth resistor is connected between the control end and the first controlled end of the fourth switch element, a seventh resistor is connected between the first controlled end of the fourth switch element and the control end of the step-down circuit, and the second controlled end of the fourth switch element is grounded.

[0021] In one embodiment, the driving circuit comprises:

[0022] Motor;

[0023] a fifth switch element, wherein a first conduction end of the fifth switch element is connected to a first DC voltage; a third diode is connected between a second conduction end of the fifth switch element and ground, and a common node between the fifth switch element and the third diode is connected to a first common end of the motor;

[0024] a sixth switch element, wherein a first conduction end of the sixth switch element is connected to a first DC voltage; a fourth diode is connected between a second conduction end of the sixth switch element and ground, and a common node between the sixth switch element and the fourth diode is connected to a second common end of the motor;

[0025] a seventh switch element, wherein a second conduction end of the seventh switch element is grounded, and a first conduction end of the seventh switch element is connected to a first positive phase end of the motor;

[0026] an eighth switch element, wherein a second conduction end of the eighth switch element is grounded, and a first conduction end of the eighth switch element is connected to a first negative phase end of the motor;

[0027] a ninth switch element, wherein a second conduction end of the ninth switch element is grounded, and a first conduction end of the ninth switch element is connected to a second positive phase end of the motor;

[0028] A tenth switching element, wherein the second conduction end of the tenth switching element is grounded, and the first conduction end of the tenth switching element is connected to the second negative phase end of the motor.

[0029] In one embodiment, it further includes:

[0030] A rectifier circuit, wherein the input end of the rectifier circuit is connected to the output end of the drive circuit, the output end of the rectifier circuit is connected to the first controlled end of the step-down circuit, and the rectifier circuit is used to rectify the AC power output by the drive circuit into a DC power supply.

[0031] In one embodiment, the rectifier circuit comprises:

[0032] a fifth diode, wherein a cathode of the fifth diode is connected to the first controlled end of the step-down circuit, and an anode of the fifth diode is connected to the second conducting end of the seventh switch element;

[0033] a sixth diode, wherein a cathode of the sixth diode is connected to the first controlled end of the step-down circuit, and an anode of the sixth diode is connected to the second conducting end of the eighth switch element;

[0034] a seventh diode, wherein a cathode of the seventh diode is connected to the first controlled end of the step-down circuit, and an anode of the seventh diode is connected to the second conducting end of the ninth switch element;

[0035] An eighth diode, wherein a cathode of the eighth diode is connected to the first controlled end of the buck circuit, and an anode of the eighth diode is connected to the second conducting end of the tenth switch element.

[0036] In one embodiment, the step-down circuit comprises:

[0037] an eleventh switch element, wherein the control end of the eleventh switch element is connected to the output end of the feedback loop, the first controlled end of the eleventh switch element is connected to the output end of the drive circuit, a ninth diode is connected between the control end and the first controlled end of the eleventh switch element, and an eighth resistor is connected between the control end and the first controlled end of the eleventh switch element;

[0038] a first inductor, wherein a first end of the first inductor is connected to the second controlled end of the eleventh switch element, a second end of the first inductor is connected to a second DC voltage, and at least one capacitor is connected between the second end of the first inductor and the ground;

[0039] A tenth diode, wherein the tenth diode is respectively connected to the eleventh switch element and the first inductor, and an anode of the tenth diode is grounded.

[0040] In one embodiment, at least one capacitor is connected between the output terminal of the driving circuit and the ground.

[0041] To achieve the above object, the utility model also proposes a stepper driver, including the stepper driver circuit as described above.

[0042] The embodiment of the utility model realizes the collection of the operating status of the driving circuit by adopting a feedback loop and an electrical connection with the driving circuit, and outputs a corresponding pulse signal, and then connects the first controlled end of the step-down circuit with the output end of the driving circuit, and the control end of the step-down circuit is connected to the output end of the feedback loop, so that the step-down circuit can effectively reduce the voltage output by the driving circuit under the drive of the pulse signal. By adopting the step-down circuit to replace the high-power resistor, the problem of heating of the high-power resistor can be overcome while effectively clamping the MOS tube voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1 This is a schematic diagram of the structure of an embodiment of a stepper driver circuit of the utility model;

[0045] Figure 2 It is a structural schematic diagram of another embodiment of the stepping driver circuit of the utility model;

[0046] Figure 3 It is a structural schematic diagram of another embodiment of the stepping driver circuit of the utility model;

[0047] Figure 4 This is the schematic diagram of the stepper driver circuit of the utility model.

[0048] Description of Figure Numbers:

[0049]

[0050] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0052] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0053] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0054] In one embodiment of the present invention, the stepping driver circuit; Figure 1 As shown, the stepper driver circuit includes a drive circuit 100, a feedback loop 200 and a buck circuit 300, wherein:

[0055] The driving circuit 100 is used to drive the motor M to rotate; the input end of the feedback loop 200 is connected to the output end of the driving circuit 100, and the feedback loop 200 is used to collect the operating status of the driving circuit 100 and output a corresponding pulse signal; the first controlled end of the step-down circuit 300 is connected to the output end of the driving circuit 100, and the control end of the step-down circuit 300 is connected to the output end of the feedback loop 200, and the step-down circuit 300 is used to reduce the voltage after rectification of the voltage spike output by the driving circuit 100 under the drive of the pulse signal.

[0056] In this embodiment, the design of the buck circuit 300 is mainly to avoid the problem that the voltage between the drain and source of the switch element is high when the drive circuit 100 is turned off, which leads to the burning of the switch element, so as to ensure the stability and reliability of the rotation of the motor M. In addition, the role of the feedback loop 200 is crucial. It can not only collect the operating status of the drive circuit 100 in real time, but also output the corresponding pulse signal according to the operating status. This design, on the one hand, helps to monitor the operation of the drive circuit 100 in real time, and promptly discover and deal with possible problems; on the other hand, through the output of the pulse signal, the duty cycle of the buck circuit 300 can be effectively adjusted, so as to achieve the purpose of more stable voltage reduction.

[0057] In addition, the driving circuit 100, feedback loop 200 and buck circuit 300 in this design are all realized by electronic components and circuit design. This design scheme not only has a high degree of integration, can reduce the size and weight of the device, but also has good flexibility and scalability, and can be adjusted and optimized according to different application scenarios and requirements.

[0058] In this embodiment, the feedback loop 200 may include a controller, and the controller may be implemented by a main control chip, such as an MCU (Microcontroller Unit), a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), a SOC (System On Chip), etc. Other simple logic gate chips may also be used.

[0059] In this embodiment, if Figure 4 As shown, the driving circuit 100 includes a motor M, a fifth switching element M1, a sixth switching element M2, a seventh switching element M3, an eighth switching element M4, a ninth switching element M5 and a tenth switching element M6, wherein:

[0060] The first conducting end of the fifth switch element M1 is connected to the first DC voltage; a third diode D1 is connected between the second conducting end of the fifth switch element M1 and the ground, and a common node of the fifth switch element M1 and the third diode D1 is connected to the first common terminal of the motor M; the first conducting end of the sixth switch element M2 is connected to the first DC voltage; a fourth diode D2 is connected between the second conducting end of the sixth switch element M2 and the ground, and a common node of the sixth switch element M2 and the fourth diode D2 is connected to the second common terminal of the motor M; the second conducting end of the seventh switch element M3 is grounded, and the first conducting end of the seventh switch element M3 is connected to the first positive phase terminal of the motor M; the second conducting end of the eighth switch element M4 is grounded, and the first conducting end of the eighth switch element M4 is connected to the first negative phase terminal of the motor M; the second conducting end of the ninth switch element M5 is grounded, and the first conducting end of the ninth switch element M5 is connected to the second positive phase terminal of the motor M; the second conducting end of the tenth switch element M6 is grounded, and the first conducting end of the tenth switch element M6 is connected to the second negative phase terminal of the motor M. At least one capacitor is connected between the output terminal of the driving circuit 100 and the ground. At least one capacitor is connected between the input terminal of the driving circuit 100 and the ground.

[0061] In this embodiment, the drive circuit 100 forms a two-phase six-wire switch drive circuit through the cooperation between the fifth switch element M1, the sixth switch element M2, the seventh switch element M3, the eighth switch element M4, the ninth switch element M5 and the tenth switch element M6, so as to drive the motor to operate efficiently under a preset working state. The fifth switch element M1, the seventh switch element M3 and the eighth switch element M4 are respectively connected to the three pins of the first winding, and the sixth switch element M2, the ninth switch element M5 and the tenth switch element M6 are respectively connected to the three pins of the second winding. By connecting the above-mentioned switch elements to different terminals of the motor winding, the motor winding is stably and reliably controlled, so that the motor operates under a preset working state. The drive circuit 100 of this embodiment adopts a two-phase six-wire method, which improves the operating efficiency of the motor and reduces energy consumption, so that the motor can maintain efficient operation under various working conditions.

[0062] It can be understood that the fifth switch element M1, the sixth switch element M2, the seventh switch element M3, the eighth switch element M4, the ninth switch element M5 and the tenth switch element M6 can all be electronic components such as MOS tubes, IGBTs, thyristors, triodes or relays that can automatically switch under the action of control signals.

[0063] In this embodiment, if Figure 4As shown, the buck circuit 300 includes an eleventh switch element M7, a first inductor L1 and a tenth diode D8, wherein:

[0064] The control end of the eleventh switch element M7 is connected to the output end of the feedback loop 200, the first controlled end of the eleventh switch element M7 is connected to the output end of the drive circuit 100, a ninth diode D7 is connected between the control end and the first controlled end of the eleventh switch element M7, and an eighth resistor R1 is connected between the control end and the first controlled end of the eleventh switch element M7; the first end of the first inductor L1 is connected to the second controlled end of the eleventh switch element M7, the second end of the first inductor L1 is connected to the second DC voltage, and at least one capacitor is connected between the second end of the first inductor L1 and the ground; the tenth diode D8 is respectively connected to the eleventh switch element M7 and the first inductor L1, and the positive electrode of the tenth diode D8 is grounded.

[0065] In the present embodiment, a buck step-down circuit is formed by the eleventh switch element M7, the first inductor L1 and the tenth diode D8, and the buck step-down circuit can be used when the input voltage fluctuates. The eleventh switch element M7 is set to adjust the output voltage amplitude so that the buck step-down circuit maintains the stability of the output voltage. In addition, the anti-interference ability of the circuit can be improved by the setting of the ninth diode D7 and the eighth resistor R1. When the input voltage fluctuates instantaneously, the ninth diode D7 and the eighth resistor R1 can limit the instantaneous change of the current, so that the output voltage is more stable. Then, by connecting at least one or more capacitors between the second end of the first inductor L1 and the ground, a filtering effect is played, and the stability of the output voltage is further improved. The tenth diode D8 is connected between the eleventh switch element M7 and the first inductor L1, which plays a role in protecting the circuit. When the circuit is short-circuited or overloaded, the tenth diode D8 will be turned on immediately, thereby cutting off the circuit and protecting the circuit elements from damage. In summary, the circuit structure provided in this embodiment forms an efficient buck step-down circuit through the eleventh switch element M7, the first inductor L1 and the tenth diode D8, which can have good anti-interference ability and protection performance while ensuring the stability of the output voltage. In addition, the circuit can be adjusted according to actual needs. For example, the values ​​of inductance and capacitance can be increased or decreased to meet different working requirements. In addition, the eleventh switch element M7 can be a MOSFET, an IGBT, a thyristor or a triode, etc., to improve the performance of the circuit.

[0066] In addition, the step-down circuit structure provided in this embodiment can not only adopt a buck step-down circuit, but also other types of power supply circuits, such as a flyback switching power supply, a buck-boost step-up / step-down circuit, etc. It is only necessary to adjust the circuit accordingly according to different application requirements.

[0067] The technical solution of the utility model adopts a feedback loop 200 to be electrically connected to the driving circuit 100 to collect the operating status of the driving circuit 100 and output a corresponding pulse signal, and then connects the first controlled end of the step-down circuit 300 to the output end of the driving circuit 100, and the control end of the step-down circuit 300 is connected to the output end of the feedback loop 200, so that the step-down circuit 300 reduces the voltage output by the driving circuit 100 under the drive of the pulse signal. By adopting the step-down circuit 300 to replace the high-power resistor, the problem of heating of the high-power resistor can be avoided while effectively clamping the MOS tube voltage.

[0068] Combined with reference Figure 2 and Figure 4 As shown, further, another embodiment of the utility model provides a stepping driver circuit, based on the above Figure 1 In the embodiment shown, the feedback loop 200 includes a detection circuit 210 and a pulse generation circuit 220, wherein:

[0069] The input end of the detection circuit 210 is connected to the output end of the driving circuit 100, and the detection circuit 210 is used to collect the operating status of the driving circuit 100 and output a corresponding voltage signal; the input end of the pulse generating circuit 220 is connected to the output end of the detection circuit 210, and the output end of the pulse generating circuit 220 is connected to the control end of the step-down circuit 300, and the pulse generating circuit 220 is used to output a corresponding pulse driving signal according to the voltage signal.

[0070] In this embodiment, the detection circuit 210 can be at least one of a voltage detection circuit and a current detection circuit, which is used to monitor the power supply status of the output of the driving circuit 100 in real time, specifically the current or voltage. More specifically, the detection circuit 210 is a voltage detection circuit, which is used to monitor the output voltage of the driving circuit 100 in real time. The detection circuit 210 can be implemented using a common voltage sensor or an analog-to-digital converter (ADC) or using the gate-source voltage characteristics of the switching element.

[0071] In this embodiment, the pulse generating circuit 220 may be a pulse generator for generating a pulse drive signal according to the voltage signal output by the detection circuit 210. The pulse generating module may be implemented by a digital signal processor (DSP), a microcontroller (MCU) or a logic gate circuit. In addition, the pulse generating circuit 220 may further include a frequency control module for adjusting the frequency of the pulse drive signal to meet different working requirements. Specifically, in the embodiment, the NE555 chip may be used for implementation.

[0072] In this embodiment, the step-down circuit is used to adjust the input voltage according to the pulse drive signal, so as to reduce the voltage. The step-down module can be implemented by a linear regulator or a switching regulator.

[0073] In this embodiment, the working principle of the entire feedback loop 200 is as follows: the detection circuit 210 monitors the operating state of the driving circuit 100 in real time, and converts the monitoring result into a voltage signal output. The pulse generating circuit 220 generates a corresponding pulse driving signal according to the voltage signal to drive the controlled end of the step-down circuit 300 to adjust the input voltage according to the pulse driving signal to achieve voltage reduction, with high control accuracy and good stability.

[0074] In this embodiment, the detection circuit 210 includes a first diode D9, a first switch element Q3 and a second switch element Q1, wherein:

[0075] A first resistor R2 is connected between the cathode of the first diode D9 and the output end of the driving circuit 100, and a second diode D10 is connected between the anode of the first diode D9 and the ground; the control end of the first switching element Q3 is connected to the common node of the first diode D9 and the second diode D10, and a second resistor R7 is connected between the control end and the second controlled end of the first switching element Q3; the control end of the second switching element Q1 is connected to the first controlled end of the first switching element Q3, a third resistor R5 is connected between the control end and the first controlled end of the second switching element Q1, and the second controlled end of the second switching element Q1 is connected to the input end of the pulse generating circuit 220.

[0076] In this embodiment, the first switch element Q3 may be a MOS tube, and the second switch element Q1 may be a triode. By using the first diode D9 to set a specific clamping voltage, when the gate-source voltage of the first switch element Q3 reaches the conduction standard, the first switch element Q3 is turned on, so that the base of the second switch element Q1 is grounded, and the base of the second switch element Q1 is input with a low level, thereby controlling the second switch element Q1 to be turned on. When the gate-source voltage of the first switch element Q3 rises to the cut-off standard, the first switch element Q3 is cut off, so that the base of the second switch element Q1 is no longer grounded. At this time, the base of the second switch element Q1 is input with a high level, thereby realizing the turn-off of the second switch element Q1.

[0077] During the operation of the circuit, the first resistor R2 can be replaced with an adjustable potentiometer according to actual needs to adjust the resistance value of the first diode D9 to achieve precise control of the clamping voltage. In addition, other components such as capacitors and resistors can be added or deleted as needed to optimize circuit performance.

[0078] The circuit structure in this embodiment has the following advantages: first, by using the first diode D9 to set the clamping voltage, the operating voltage of the circuit can be effectively reduced and the stability of the circuit can be improved; second, the combination of the first switching element Q3 and the second switching element Q1 enables the circuit to have better switching speed and dynamic response; finally, the circuit structure is simple, easy to implement and low cost.

[0079] In this embodiment, the pulse generating circuit 220 includes a pulse chip U1, a fifth resistor R8, a third switch element Q2 and a fourth switch element Q4, wherein:

[0080] At least one capacitor is connected between the control end of the pulse chip U1 and the ground, and the reset end of the pulse chip U1 is connected to the output end of the detection circuit 210; a fourth resistor R6 is connected between the first end of the fifth resistor R8 and the output end of the detection circuit 210, and a common node of the fourth resistor R6 and the fifth resistor R8 is connected to the discharge end of the pulse chip U1, a first capacitor C5 is connected between the fifth resistor R8 and the ground, and a common node of the fifth resistor R8 and the first capacitor C5 is connected to the trigger end; the control end of the third switch element Q2 is connected to the drive output end of the pulse chip U1, and the second controlled end of the third switch element Q2 is grounded; the control end of the fourth switch element Q4 is connected to the first controlled end of the third switch element Q2, a sixth resistor R4 is connected between the control end and the first controlled end of the fourth switch element Q4, a seventh resistor R3 is connected between the first controlled end of the fourth switch element Q4 and the control end of the step-down circuit 300, and the second controlled end of the fourth switch element Q4 is grounded.

[0081] In this embodiment, the pulse chip U1 can be a NE555 chip to provide a stable and reliable pulse output. The output end of the NE555 chip is connected to the control end of the third switch element Q2. In this way, when the pulse chip U1 outputs a pulse, the switch state of the third switch element Q2 can be controlled, thereby realizing the control of the circuit. In addition, the control end of the fourth switch element Q4 is connected to the first controlled end of the third switch element Q2, so that when the pulse chip U1 outputs a pulse, the fourth switch element Q4 can also switch the state accordingly to realize further control of the circuit.

[0082] In this embodiment, the fifth resistor R8 and the first capacitor C5 together form a charging loop. When there is a signal at the output end of the detection circuit 210, the capacitor C5 starts to charge, and when the charging voltage reaches a certain value, the pulse chip U1 is triggered to output a pulse signal. The pulse signal passes through the fifth resistor R8 and the fourth resistor R6, driving the third switch element Q2 and the fourth switch element Q4 to switch states, thereby controlling the circuit.

[0083] In addition, the reset end of the pulse chip U1 is connected to the output end of the detection circuit 210, so that when the detection circuit 210 detects an abnormal signal, the pulse chip U1 can be triggered to reset in time to ensure the normal operation of the circuit. Through the coordinated work of the pulse chip U1, the fifth resistor R8, the third switch element Q2 and the fourth switch element Q4, stable control of the circuit can be achieved. At the same time, the addition of the detection circuit 210 and the buck circuit 300 makes the circuit have better performance and reliability.

[0084] Combined with reference Figure 3 and Figure 4 As shown, further, another embodiment of the utility model provides a stepper driver circuit, based on the above Figure 1 In the embodiment shown, the stepper driver circuit further includes a rectifier circuit 400, wherein:

[0085] The input end of the rectifier circuit 400 is connected to the output end of the drive circuit 100, and the output end of the rectifier circuit 400 is connected to the first controlled end of the step-down circuit 300. The rectifier circuit 400 is used to rectify the AC power output by the drive circuit 100 into a DC power.

[0086] In this embodiment, the rectifier circuit 400 can adopt a full-bridge rectifier circuit or a half-wave rectifier circuit to better rectify the voltage output by the drive circuit 100, and can have a good rectification effect and a stable output voltage. Specifically, the rectifier circuit is composed of four diodes, which are respectively set corresponding to the output ends of the drive circuit 100, and the negative ends of the four diodes are connected in parallel, that is, the four diodes correspond to one output, and then the rectified output voltage is collected on one line to obtain a stable DC power supply feedback loop and the step-down circuit 300, further reducing voltage fluctuations and improving power supply stability.

[0087] In this embodiment, the rectifier circuit 400 includes a fifth diode D3, a sixth diode D4, a seventh diode D5 and an eighth diode D6, wherein:

[0088] The cathode of the fifth diode D3 is connected to the first controlled end of the buck circuit 300, and the anode of the fifth diode D3 is connected to the second conductive end of the seventh switch element M3; the cathode of the sixth diode D4 is connected to the first controlled end of the buck circuit 300, and the anode of the sixth diode D4 is connected to the second conductive end of the eighth switch element M4; the cathode of the seventh diode D5 is connected to the first controlled end of the buck circuit 300, and the anode of the seventh diode D5 is connected to the second conductive end of the ninth switch element M5; the cathode of the eighth diode D6 is connected to the first controlled end of the buck circuit 300, and the anode of the eighth diode D6 is connected to the second conductive end of the tenth switch element M6.

[0089] In this embodiment, the AC power output by the driving circuit is rectified by providing a fifth diode D3, a sixth diode D4, a seventh diode D5 and an eighth diode D6. On the one hand, the AC power is rectified into a DC power that can be used by the feedback loop 200 and the buck circuit 300. On the other hand, the rectification of the diodes further reduces voltage fluctuations and improves power supply stability. On the basis of the rectification by the above four diodes, more diodes can be added as needed to further improve the rectification effect.

[0090] The utility model also proposes a stepper driver, which includes a stepper driver circuit. The specific structure of the stepper driver circuit refers to the above-mentioned embodiment. Since the stepper driver adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0091] The above is an implementation method provided in combination with specific content, and it is not considered that the specific implementation of this application is limited to these descriptions. Any similarity or similarity with the method, structure, etc. of this application, or any technical deduction or replacement made on the premise of the concept of this application, shall be deemed to be within the scope of protection of this application.

Claims

1. A stepper driver circuit, characterized in that: include: A driving circuit, wherein the driving circuit is used to drive the motor to rotate; A feedback loop, wherein the input end of the feedback loop is connected to the output end of the driving circuit, and the feedback loop is used to collect the operating state of the driving circuit and output a corresponding pulse signal; A step-down circuit, wherein the first controlled end of the step-down circuit is connected to the output end of the driving circuit, the control end of the step-down circuit is connected to the output end of the feedback loop, and the step-down circuit is used to reduce the voltage after rectification of the voltage spike output by the driving circuit under the drive of the pulse signal.

2. The stepper driver circuit according to claim 1, characterized in that: The feedback loop includes: A detection circuit, wherein an input end of the detection circuit is connected to an output end of the drive circuit, and the detection circuit is used to collect an operating state of the drive circuit and output a corresponding voltage signal; A pulse generating circuit, wherein the input end of the pulse generating circuit is connected to the output end of the detection circuit, the output end of the pulse generating circuit is connected to the control end of the step-down circuit, and the pulse generating circuit is used to output a corresponding pulse driving signal according to a voltage signal.

3. The stepper driver circuit according to claim 2, characterized in that: The detection circuit comprises: a first diode, wherein a first resistor is connected between a cathode of the first diode and an output terminal of the driving circuit, and a second diode is connected between an anode of the first diode and ground; a first switch element, wherein a control terminal of the first switch element is connected to a common node of the first diode and the second diode, and a second resistor is connected between the control terminal and the second controlled terminal of the first switch element; A second switch element, wherein the control end of the second switch element is connected to the first controlled end of the first switch element, a third resistor is connected between the control end and the first controlled end of the second switch element, and the second controlled end of the second switch element is connected to the input end of the pulse generating circuit.

4. The stepper driver circuit according to claim 2, characterized in that: The pulse generating circuit comprises: A pulse chip, wherein at least one capacitor is connected between a control terminal of the pulse chip and ground, and a reset terminal of the pulse chip is connected to an output terminal of the detection circuit; A fifth resistor, a fourth resistor is connected between a first end of the fifth resistor and the output end of the detection circuit, a common node of the fourth resistor and the fifth resistor is connected to a discharge end of the pulse chip, a first capacitor is connected between the fifth resistor and the ground, and a common node of the fifth resistor and the first capacitor is connected to a trigger end; A third switch element, wherein a control end of the third switch element is connected to the driving output end of the pulse chip, and a second controlled end of the third switch element is grounded; A fourth switch element, wherein the control end of the fourth switch element is connected to the first controlled end of the third switch element, a sixth resistor is connected between the control end and the first controlled end of the fourth switch element, a seventh resistor is connected between the first controlled end of the fourth switch element and the control end of the step-down circuit, and the second controlled end of the fourth switch element is grounded.

5. The stepper driver circuit according to claim 1, characterized in that: The driving circuit comprises: Motor; a fifth switch element, wherein a first conduction end of the fifth switch element is connected to a first DC voltage; a third diode is connected between a second conduction end of the fifth switch element and ground, and a common node between the fifth switch element and the third diode is connected to a first common end of the motor; a sixth switch element, wherein a first conduction end of the sixth switch element is connected to a first DC voltage; a fourth diode is connected between a second conduction end of the sixth switch element and ground, and a common node between the sixth switch element and the fourth diode is connected to a second common end of the motor; a seventh switch element, wherein a second conduction end of the seventh switch element is grounded, and a first conduction end of the seventh switch element is connected to a first positive phase end of the motor; an eighth switch element, wherein a second conduction end of the eighth switch element is grounded, and a first conduction end of the eighth switch element is connected to a first negative phase end of the motor; a ninth switch element, wherein a second conduction end of the ninth switch element is grounded, and a first conduction end of the ninth switch element is connected to a second positive phase end of the motor; A tenth switching element, wherein the second conduction end of the tenth switching element is grounded, and the first conduction end of the tenth switching element is connected to the second negative phase end of the motor.

6. The stepper driver circuit according to claim 5, characterized in that: Also includes: A rectifier circuit, wherein the input end of the rectifier circuit is connected to the output end of the drive circuit, the output end of the rectifier circuit is connected to the first controlled end of the step-down circuit, and the rectifier circuit is used to rectify the AC power output by the drive circuit into a DC power supply.

7. The stepper driver circuit according to claim 6, characterized in that: The rectifier circuit comprises: a fifth diode, wherein a cathode of the fifth diode is connected to the first controlled end of the step-down circuit, and an anode of the fifth diode is connected to the second conducting end of the seventh switch element; a sixth diode, wherein a cathode of the sixth diode is connected to the first controlled end of the step-down circuit, and an anode of the sixth diode is connected to the second conducting end of the eighth switch element; a seventh diode, wherein a cathode of the seventh diode is connected to the first controlled end of the step-down circuit, and an anode of the seventh diode is connected to the second conducting end of the ninth switch element; An eighth diode, wherein a cathode of the eighth diode is connected to the first controlled end of the buck circuit, and an anode of the eighth diode is connected to the second conducting end of the tenth switch element.

8. The stepper driver circuit according to claim 1, characterized in that: The step-down circuit comprises: an eleventh switch element, wherein the control end of the eleventh switch element is connected to the output end of the feedback loop, the first controlled end of the eleventh switch element is connected to the output end of the drive circuit, a ninth diode is connected between the control end and the first controlled end of the eleventh switch element, and an eighth resistor is connected between the control end and the first controlled end of the eleventh switch element; a first inductor, wherein a first end of the first inductor is connected to the second controlled end of the eleventh switch element, a second end of the first inductor is connected to a second DC voltage, and at least one capacitor is connected between the second end of the first inductor and the ground; A tenth diode, wherein the tenth diode is respectively connected to the eleventh switch element and the first inductor, and an anode of the tenth diode is grounded.

9. The stepper driver circuit according to claim 1, characterized in that: At least one capacitor is connected between the output end of the driving circuit and the ground.

10. A stepper driver, characterized in that: Comprising a stepper driver circuit as described in any one of claims 1-9.

Images