Driving system and stepping motor driver

Abstract

The utility model discloses a driving system and a stepping motor driver, and relates to the technical field of drivers, and the driving system comprises an indication feedback circuit and a relay circuit. Through the indication feedback circuit connected into the relay circuit, when a relay in the relay circuit has a fault and cannot be closed, the indication feedback circuit outputs a feedback signal to the driving controller according to the fault condition, so that the driving controller controls a load to stop working, the phenomenon that a post-stage resistor is burnt out is avoided, and potential safety hazards are reduced; meanwhile, the indication feedback circuit can output indication information according to the fault condition so as to transmit the current relay fault phenomenon to an operator, so that the fault information can be quickly and timely transmitted under the condition that the operator does not need to carry out manual detection operation, the operator can timely process the relay fault, and potential safety hazards are avoided.

Description

Technical Field

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

[0002] Since the automatic switching element with isolation function and its control circuit are relatively simple, the relay is widely used in stepper motor drivers to drive load power supply.

[0003] However, during the test of the circuit based on the relay driving the load power supply, it was found that the relay was energized and could not be normally attracted due to a fault. Figure 1 The conventional circuit shown cannot provide any fault indication information of the relay. Only the operator can know the fault condition of the relay through manual inspection and operation. Therefore, it is impossible to deal with the relay fault in time, which poses a great safety hazard. Utility Model Content

[0004] The main purpose of this application is to propose a drive system and a stepper motor driver, which aims to solve the technical problem that the relay fault information is not received in time and the relay fault cannot be handled in time, causing a great safety hazard.

[0005] To achieve the above-mentioned purpose, the present application proposes a drive system, wherein the drive system is connected to a drive controller, and the drive system includes an indication feedback circuit and a relay circuit, wherein the indication feedback circuit is connected to the relay circuit;

[0006] The feedback end of the indication feedback circuit is connected to the drive controller, and is used to output a feedback signal to the drive controller when a relay in the relay circuit fails, so that the drive controller controls the drive load to stop working based on the feedback signal, and is used to output indication information when a fault occurs in the relay circuit;

[0007] The control end of the relay circuit is connected to the drive controller, and is used to enter a closed state upon receiving a power-on signal output by the drive controller, and turn on the indication feedback circuit to supply power to the drive load.

[0008] In one embodiment, the indication feedback circuit includes a rectifier bridge module, a charging buffer module, a fault indication module, a fault feedback module and a charging pickup module;

[0009] The rectifier bridge module is connected in series with the charging pickup module, the charging buffer module is connected between the rectifier bridge module and the charging pickup module, and the fault indication module and the fault feedback module are connected in parallel with the charging buffer module.

[0010] In one embodiment, the rectifier bridge module includes a first diode and a second diode connected in series, and a third diode and a fourth diode connected in series;

[0011] The connection point of the first diode and the second diode is connected to a phase line of a power grid, and the connection point of the third diode and the fourth diode is connected to a two-phase line of a power grid;

[0012] One end of the first diode away from the second diode is connected to one end of the third diode away from the fourth diode to form a first DC end, and one end of the second diode away from the first diode is connected to one end of the fourth diode away from the third diode to form a second DC end.

[0013] In one embodiment, the charging and engaging module includes a first capacitor and a second capacitor connected in parallel;

[0014] The first end of the first capacitor and the first end of the second capacitor are connected to the first DC terminal, and the second end of the first capacitor and the second end of the second capacitor are connected to the second DC terminal.

[0015] In one embodiment, the charging buffer module includes a first resistor;

[0016] The first end of the first resistor is connected to the second DC end, and the second end of the first resistor is connected to the second end of the first capacitor.

[0017] In one embodiment, the fault indication module includes a second resistor and a first light emitting diode connected in series;

[0018] One end of the second resistor away from the first light emitting diode is connected to the first end of the first resistor, and one end of the first light emitting diode away from the second resistor is connected to the second end of the first resistor.

[0019] In one embodiment, the fault feedback module includes a third resistor, a photocoupler, a fourth resistor and a third capacitor, wherein the photocoupler includes a second light emitting diode and a light detector;

[0020] The first end of the third resistor is connected to the first end of the first resistor, and the second end of the third resistor is connected to the positive electrode of the second light emitting diode;

[0021] The cathode of the second light emitting diode is connected to the second end of the first resistor, the input end of the light detector is connected to the power supply current, and the output end of the light detector is connected to the connection point of the fourth resistor and the third capacitor;

[0022] The fourth resistor and the third capacitor are connected in parallel and grounded.

[0023] In one embodiment, the relay includes a first switching device and a first inductor;

[0024] The first resistor is connected in parallel to both ends of the first switch device, and the first end of the first inductor is connected to the power supply current.

[0025] In one implementation, the relay circuit further includes a fifth diode, a fourth capacitor, a first switch tube and a fifth resistor;

[0026] The fifth diode is connected in parallel to both ends of the first inductor, the input end of the first switch tube is connected to the second end of the first inductor and the anode of the fifth diode respectively, and the control end of the first switch tube is connected to the drive controller;

[0027] The first end of the fourth capacitor is connected to the power supply current end and the cathode of the fifth diode respectively, the first end of the fifth resistor is connected to the control end of the first switch tube, the second end of the fourth capacitor, the second end of the fifth resistor and the output end of the first switch tube are connected in common and then grounded.

[0028] The present application also proposes a stepper motor driver, comprising a drive system, the drive system being connected to a drive controller, the drive system comprising an indication feedback circuit and a relay circuit, the indication feedback circuit being connected to the relay circuit;

[0029] The feedback end of the indication feedback circuit is connected to the drive controller, and is used to output a feedback signal to the drive controller when a relay in the relay circuit fails, so that the drive controller controls the drive load to stop working based on the feedback signal, and is used to output indication information when a fault occurs in the relay circuit;

[0030] The control end of the relay circuit is connected to the drive controller, and is used to enter a closed state upon receiving a power-on signal output by the drive controller, and turn on the indication feedback circuit to supply power to the drive load.

[0031] In the technical solution of the present application, a driving system is provided, the driving system is connected to the driving controller, the driving system includes an indication feedback circuit and a relay circuit, the indication feedback circuit is connected to the relay circuit; the feedback end of the indication feedback circuit is connected to the driving controller, and is used to output a feedback signal to the driving controller when a relay in the relay circuit fails, so that the driving controller controls the driving load to stop working based on the feedback signal, and is used to output indication information when a fault occurs in the relay circuit; the control end of the relay circuit is connected to the driving controller, and is used to enter a closed state when receiving a power-on signal output by the driving controller, and turn on the indication feedback circuit to power the driving load. By connecting the indication feedback circuit to the relay circuit, when the relay in the relay circuit fails and cannot be attracted, the indication feedback circuit outputs a feedback signal to the driving controller according to the fault condition, so that the driving controller controls the load to stop working, avoids the phenomenon of the rear-stage resistor burning out, and reduces safety hazards. At the same time, the indication feedback circuit will also output indication information according to the fault condition to transmit the current relay fault phenomenon to the operator, so as to realize the rapid and timely transmission of fault information without the operator performing manual detection operations, so that the operator can handle the relay fault in time and avoid safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application 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 present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0033] Figure 1 This is a schematic diagram of the circuit structure for conventionally supplying power to the driving load;

[0034] Figure 2 This is a schematic diagram of the module structure of the drive system of this application;

[0035] Figure 3 This is a schematic diagram of the circuit structure of the driving system of this application.

[0036] Description of Figure Numbers:

[0037] 10. Indication feedback circuit; BR, rectifier bridge module; 101. Charging buffer module; 102. Fault indication module; 103. Fault feedback module; 104. Charging pickup module;

[0038] 20. Relay circuit;

[0039] D1, first diode; D2, second diode; D3, third diode; D4, fourth diode; D5, fifth diode;

[0040] C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor;

[0041] R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor;

[0042] Do1, first light emitting diode; Do2, second light emitting diode;

[0043] U1, photocoupler; L, photodetector; RL, relay; K1, first switch device; L1, first inductor; Q1, first switch tube.

[0044] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0048] During the test of the circuit based on relay-driven load power supply, it was found that the relay was energized and could not be normally attracted due to a fault. Figure 1 The conventional circuit shown cannot provide any fault indication information of the relay. Only the operator can know the fault condition of the relay through manual inspection and operation. Therefore, it is impossible to deal with the relay fault in time, which is a technical problem with great safety hazards.

[0049] In order to solve this technical problem, the present application provides a driving system to solve the technical problem that the relay fault information is not obtained in time and the relay fault cannot be handled in time, causing a great safety hazard.

[0050] See also Figure 2 , the present application proposes a driving system, the driving system is connected to a driving controller, the driving system comprises an indication feedback circuit 10 and a relay circuit 20, the indication feedback circuit 10 is connected to the relay circuit 20;

[0051] The feedback end of the indication feedback circuit 10 is connected to the drive controller, and is used to output a feedback signal to the drive controller when a fault occurs in the relay RL in the relay circuit 20, so that the drive controller controls the drive load to stop working based on the feedback signal, and is used to output indication information when a fault occurs in the relay circuit 20. The control end of the relay circuit 20 is connected to the drive controller, and is used to enter a closed state when receiving a power-on signal output by the drive controller, and turn on the indication feedback circuit 10 to power the drive load.

[0052] First Figure 1 The conventional circuit shown is explained. Figure 1 L1 and L2 in the figure are connected to the power grid, and the power grid current passes through the rectifier bridge (i.e. Figure 1 BR in the figure) is rectified into a DC current. If the drive controller outputs a power-on signal to the transistor (i.e. Figure 1 In the Q of the transistor, the transistor conduction loop is formed. At this time, the power supply current on the power supply current end flows through the inductor (i.e. Figure 1 L in the relay RL is grounded. If the relay RL can work normally, the switch device in the relay RL (i.e. Figure 1 The K in the figure will be attracted by the energized inductor. At this time, the DC current will pass through the switch device to the capacitor (i.e. Figure 1 C) in the relay is charged and supplies power to the subsequent drive load; if the relay RL cannot work normally, that is, the switch device in the relay RL cannot be normally attracted, the DC current will pass through the resistor (i.e. Figure 1R in the relay charges the capacitor. When the capacitor is fully charged, the switch device in the relay RL is closed, and the DC current charges the capacitor through the switch device.

[0053] From the above, it can be seen that in conventional circuits, when the relay RL fails, it is not able to actively feedback the fault information to the operator. Although a switch device is configured to charge the capacitor to ensure normal power supply to the drive load, the subsequent resistor will always be overheated before the capacitor is fully charged, and there is still a safety risk.

[0054] Therefore, based on the above-mentioned existing problems, this embodiment proposes a driving system capable of relay RL fault indication and feedback. The relay RL fault in the relay circuit 20 is detected by the indication feedback circuit 10 connected to the relay circuit 20 in the driving system, and the corresponding current flow path is triggered according to the state of the switch device in the relay RL, and the feedback signal and the indication signal are triggered according to the current flow path, so that the safety hazard is handled without the operator performing manual detection operations, and the fault information is transmitted quickly and timely, so that the operator can handle the relay RL fault in time to avoid safety hazards.

[0055] It should be noted that Figure 1 Other device structures in Figure 3 The device structure is the same as that in Figure 3 The description of is taken as an example and no further description is given here.

[0056] Specifically, refer to Figure 3 As shown, the indication feedback circuit 10 includes a rectifier bridge module BR, a charging buffer module 101, a fault indication module 102, a fault feedback module 103 and a charging pickup module 104;

[0057] The rectifier bridge module BR is connected in series with the charging pull-in module 104 , the charging buffer module 101 is connected between the rectifier bridge module BR and the charging pull-in module 104 , and the fault indication module 102 and the fault feedback module 103 are connected in parallel with the charging buffer module 101 .

[0058] Because the drive system in this embodiment is connected to the power grid, it is necessary to set a rectifier bridge module BR in the drive system to rectify the power grid current connected from the power grid, and rectify it into a DC current that can supply power to the drive load. At the same time, in order to reduce the current value of the DC current output to the drive load and avoid the impact of large current impact and excessive heat generation when starting the drive load, a charging buffer module 101 is set. The DC current when the drive load is started is limited by the charging buffer module 101 to achieve smooth starting of the drive load. In addition, while the charging buffer module 101 is stepping down the DC current connected, the DC current after the step-down will be transmitted to the charging suction module 104 to charge the charging suction module 104. After the charging suction module 104 is fully charged, it will assist the switch device in the relay RL in the relay circuit 20 to be pulled in. In this way, when the relay RL fails and cannot be pulled in normally, the relay RL is assisted by the charging suction module 104 to ensure the normal operation of the drive system and reduce the safety hazards that the relay RL has not been pulled in before the fault is handled.

[0059] The fault processing is mainly performed by the fault indication module 102 and the fault feedback module 103. The fault indication module 102 is used to send an indication signal to directly reflect the current relay RL fault to the operator, and the fault feedback module 103 is used to send a feedback signal to the drive controller that controls the drive system and the drive load, and feedback the current relay RL fault, so that the drive controller can quickly stop the signal output to the drive system and the drive load after receiving the feedback signal, and control the drive system and the drive load to enter the shutdown state.

[0060] It should be noted that the drive controller can determine the on-time of the photoelectric coupler U1 in the fault feedback module 103 according to the input feedback signal, and judge whether the current relay RL has a fault according to the on-time of the photoelectric coupler U1. If the drive controller determines that the on-time of the photoelectric coupler U1 is less than the preset on-time according to the input feedback signal, it is considered that the current relay RL can be started normally; if the drive controller determines that the on-time of the photoelectric coupler U1 is greater than the preset on-time according to the input feedback signal, it is considered that the current relay RL has a fault.

[0061] Further, the rectifier bridge module BR includes a first diode D1 and a second diode D2 connected in series, and a third diode D3 and a fourth diode D4 connected in series;

[0062] The connection point of the first diode D1 and the second diode D2 is connected to a phase line of the power grid, and the connection point of the third diode D3 and the fourth diode D4 is connected to a two-phase line of the power grid; an end of the first diode D1 away from the second diode D2 is connected to an end of the third diode D3 away from the fourth diode D4 to form a first DC end, and an end of the second diode D2 away from the first diode D1 is connected to an end of the fourth diode D4 away from the third diode D3 to form a second DC end.

[0063] In the positive half cycle of the grid current, the first diode D1 and the third diode D3 are turned on, the second diode D2 and the fourth diode D4 are turned off, and the first access terminal (i.e. Figure 3 The grid current connected to the charging pickup module 104 is returned to the second access terminal (i.e., the charging current is connected to the charging pickup module 104) through the first diode D1 and the third diode D3. Figure 3 L2 in the circuit) generates a DC current with a positive top and a negative bottom output to drive the load.

[0064] In the negative half cycle of the grid current, the second diode D2 and the fourth diode D4 are turned on, the first diode D1 and the third diode D3 are turned off, and the grid current connected from the first access end bypasses the charging attraction module 104 through the turned-on second diode D2, and then returns to the second access end through the turned-on fourth diode D4, thereby generating a DC current with a positive top and a negative bottom output to the driving load.

[0065] Furthermore, the charging and engaging module 104 includes a first capacitor C1 and a second capacitor C2 connected in parallel;

[0066] A first end of the first capacitor C1 and a first end of the second capacitor C2 are connected to the first DC terminal, and a second end of the first capacitor C1 and a second end of the second capacitor C2 are connected to the second DC terminal.

[0067] The charging attraction module 104 in this embodiment includes a first capacitor C1 and a second capacitor C2. When the first switch device K1 in the relay RL fails to close due to a fault, the DC current flowing in the circuit structure will be input into the first capacitor C1 and the second capacitor C2 through the charging buffer module 101, so as to charge the first capacitor C1 and the second capacitor C2. When the first capacitor C1 and the second capacitor C2 are fully charged, they will assist the first switch device K1 in the relay RL to be attracted. At this time, the DC current will supply power to the first capacitor C1 and the second capacitor C2 through the attracted first switch device K1, and the corresponding first capacitor C1 and the second capacitor C2 will supply power to the driving load connected to the subsequent stage.

[0068] Further, the charging buffer module 101 includes a first resistor R1;

[0069] The first end of the first resistor R1 is connected to the second DC end, and the second end of the first resistor R1 is connected to the second end of the first capacitor C1. When the DC current flows through the first resistor R1, a voltage drop will be generated due to the resistance value of the first resistor R1 itself, thereby reducing the voltage value of the DC current and limiting the DC current.

[0070] Further, the fault indication module 102 includes a second resistor R2 and a first light emitting diode Do1 connected in series;

[0071] One end of the second resistor R2 away from the first light emitting diode Do1 is connected to the first end of the first resistor R1 , and one end of the first light emitting diode Do1 away from the second resistor R2 is connected to the second end of the first resistor R1 .

[0072] When the first switch device K1 in the relay RL fails to close, the DC current not only flows through the first resistor R1 to charge the first capacitor C1 and the second capacitor C2, but also flows through the second resistor R2 and the first light-emitting diode Do1. At this time, the first light-emitting diode Do1 enters a light-emitting state according to the connected DC current, thereby outputting an indication signal to the operator, reflecting that there is currently a relay RL fault.

[0073] The purpose of the second resistor R2 connected in series is to adjust the direct current flowing through the light emitting diode to protect the light emitting diode.

[0074] Further, the fault feedback module 103 includes a third resistor R3, a photocoupler U1, a fourth resistor R4 and a third capacitor C3, wherein the photocoupler U1 includes a second light emitting diode Do2 and a light detector L;

[0075] The first end of the third resistor R3 is connected to the first end of the first resistor R1, and the second end of the third resistor R3 is connected to the positive electrode of the second light-emitting diode Do2; the negative electrode of the second light-emitting diode Do2 is connected to the second end of the first resistor R1, the input end of the light detector L is connected to the power supply current, and the output end of the light detector L is connected to the connection point of the fourth resistor R4 and the third capacitor C3; the fourth resistor R4 and the third capacitor C3 are connected in parallel and grounded.

[0076] When the first switch device K1 in the relay RL fails, the DC current will synchronously flow to the third resistor R3, and then flow to the second light-emitting diode Do2 in the photocoupler U1 through the third resistor R3. The second light-emitting diode Do2 enters the light-emitting state based on the DC current connected. At this time, the light of the second light-emitting diode Do2 in the light-emitting state will be received by the photodetector L, and the photodetector L enters the on state. The power supply current (i.e. Figure 3 The VDD in the photodetector L is output to the output terminal of the photodetector L based on the conduction state, forming an electrical signal output to the feedback signal output terminal. Figure 3 TO MCU in the drive controller).

[0077] The third resistor R3 is used to protect the photoelectric coupler U1, and the fourth resistor R4 and the third capacitor C3 play a filtering role.

[0078] Further, the relay RL includes a first switch device K1 and a first inductor L1;

[0079] The first resistor R1 is connected in parallel to both ends of the first switch device K1 , a first end of the first inductor L1 is connected to the power current, and a second end of the first inductor L1 is grounded.

[0080] When the first switch device K1 is automatically closed based on the energized first inductor L1 , a direct current flows through the first switch device K1 to charge the first capacitor C1 and the second capacitor C2 .

[0081] Furthermore, the relay circuit 20 further includes a fifth diode D5, a fourth capacitor C4, a first switch tube Q1 and a fifth resistor R5;

[0082] The fifth diode D5 is connected in parallel to both ends of the first inductor L1, the input end of the first switch tube Q1 is connected to the second end of the first inductor L1 and the positive electrode of the fifth diode D5 respectively, and the control end of the first switch tube Q1 is connected to the drive controller; the first end of the fourth capacitor C4 is connected to the power supply current end and the negative electrode of the fifth diode D5 respectively, the first end of the fifth resistor R5 is connected to the control end of the first switch tube Q1, and the second end of the fourth capacitor C4, the second end of the fifth resistor R5 and the output end of the first switch tube Q1 are connected in common and then grounded.

[0083] When the control terminal of the first switch tube Q1 is connected to the power-on signal output by the drive controller (i.e. Figure 3 When RELAY_C in the circuit enters the on state, the power supply current (i.e. Figure 3The VDD in the power supply (VDD) flows into the ground terminal through the first inductor L1 and the first switch tube Q1, and the power supply current flows into the ground terminal through the fourth capacitor C4. At this time, the first inductor L1 generates a magnetic field to attract the first switch device K1. Among them, the fifth resistor R5 is used to protect the control end of the first switch tube Q1, and the fifth diode D5 is used to provide a freewheeling path when the first inductor L1 is disconnected to reduce the peak voltage.

[0084] The present application also proposes a stepper motor driver, which includes the drive system as described above. The specific structure of the drive system refers to the above embodiment. Since the stepper motor driver adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0085] The above description is only an exemplary embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A drive system, characterized in that: The drive system is connected to the drive controller, and the drive system includes an indication feedback circuit and a relay circuit, and the indication feedback circuit is connected to the relay circuit; The feedback end of the indication feedback circuit is connected to the drive controller, and is used to output a feedback signal to the drive controller when a relay in the relay circuit fails, so that the drive controller controls the drive load to stop working based on the feedback signal, and is used to output indication information when a fault occurs in the relay circuit; The control end of the relay circuit is connected to the drive controller, and is used to enter a closed state upon receiving a power-on signal output by the drive controller, and turn on the indication feedback circuit to supply power to the drive load.

2. The drive system according to claim 1, characterized in that: The indication feedback circuit includes a rectifier bridge module, a charging buffer module, a fault indication module, a fault feedback module and a charging pickup module; The rectifier bridge module is connected in series with the charging pickup module, the charging buffer module is connected between the rectifier bridge module and the charging pickup module, and the fault indication module and the fault feedback module are connected in parallel with the charging buffer module.

3. The drive system according to claim 2, characterized in that: The rectifier bridge module comprises a first diode and a second diode connected in series, and a third diode and a fourth diode connected in series; The connection point of the first diode and the second diode is connected to a phase line of a power grid, and the connection point of the third diode and the fourth diode is connected to a two-phase line of a power grid; One end of the first diode away from the second diode is connected to one end of the third diode away from the fourth diode to form a first DC end, and one end of the second diode away from the first diode is connected to one end of the fourth diode away from the third diode to form a second DC end.

4. The drive system according to claim 3, characterized in that: The charging and pulling module includes a first capacitor and a second capacitor connected in parallel; The first end of the first capacitor and the first end of the second capacitor are connected to the first DC terminal, and the second end of the first capacitor and the second end of the second capacitor are connected to the second DC terminal.

5. The drive system according to claim 4, characterized in that: The charging buffer module includes a first resistor; The first end of the first resistor is connected to the second DC end, and the second end of the first resistor is connected to the second end of the first capacitor.

6. The drive system according to claim 5, characterized in that: The fault indication module includes a second resistor and a first light emitting diode connected in series; One end of the second resistor away from the first light emitting diode is connected to the first end of the first resistor, and one end of the first light emitting diode away from the second resistor is connected to the second end of the first resistor.

7. The drive system according to claim 6, characterized in that: The fault feedback module includes a third resistor, a photoelectric coupler, a fourth resistor and a third capacitor, wherein the photoelectric coupler includes a second light emitting diode and a light detector; The first end of the third resistor is connected to the first end of the first resistor, and the second end of the third resistor is connected to the positive electrode of the second light emitting diode; The cathode of the second light emitting diode is connected to the second end of the first resistor, the input end of the light detector is connected to the power supply current, and the output end of the light detector is connected to the connection point of the fourth resistor and the third capacitor; The fourth resistor and the third capacitor are connected in parallel and grounded.

8. The drive system according to claim 7, characterized in that: The relay comprises a first switching device and a first inductor; The first resistor is connected in parallel to both ends of the first switch device, and the first end of the first inductor is connected to the power supply current.

9. The drive system according to claim 8, characterized in that: The relay circuit also includes a fifth diode, a fourth capacitor, a first switch tube and a fifth resistor; The fifth diode is connected in parallel to both ends of the first inductor, the input end of the first switch tube is connected to the second end of the first inductor and the anode of the fifth diode respectively, and the control end of the first switch tube is connected to the drive controller; The first end of the fourth capacitor is connected to the power supply current end and the cathode of the fifth diode respectively, the first end of the fifth resistor is connected to the control end of the first switch tube, the second end of the fourth capacitor, the second end of the fifth resistor and the output end of the first switch tube are connected in common and then grounded.

10. A stepper motor driver, characterized in that: The stepper motor driver comprises a drive system as claimed in any one of claims 1 to 9.

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