Stepping motor driving device based on H bridge

Abstract

The utility model discloses a stepping motor driving device based on an H-bridge, which relates to the technical field of stepping motor driving equipment, and is characterized in that an H-bridge motor driving chip is provided with a power port, a grounding port and at least two H-bridge circuit channels; each H-bridge circuit channel is provided with two input ports and two output ports; two H-bridge circuit channels control one stepping motor; four input ports for controlling the same stepping motor are connected with a signal source, and four output ports are connected with the stepping motor; each output port corresponds to one LC filtering assembly and one diode; one end of each diode is connected between the corresponding output port and the stepping motor, and the other end of each diode is grounded; each LC filtering assembly is connected between the corresponding output port and the stepping motor. The stepping motor driving device provided by the utility model is simple in structure and low in cost, and has antistatic and filtering effects.

Description

Technical Field

[0001] The utility model relates to the technical field of stepper motor driving equipment, and more specifically, to a stepper motor driving device based on an H-bridge. Background Art

[0002] The stepper motor is an open-loop control motor that converts electrical pulse signals into angular displacement or linear displacement, also known as a pulse motor. In the case of non-overload, the motor's speed and stop position depend only on the frequency and number of pulses of the pulse signal, and are not affected by load changes. When the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle in the set direction, called the "step angle", and its rotation runs step by step at a fixed angle. The angular displacement can be controlled by controlling the number of pulses to achieve the purpose of accurate positioning; at the same time, the speed and acceleration of the motor rotation can be controlled by controlling the pulse frequency, thereby achieving the purpose of speed regulation. As an actuator, the stepper motor is one of the key products of mechatronics and is widely used in various automation control systems. With the development of microelectronics and computer technology, the demand for stepper motors is increasing day by day, and they are used in various fields.

[0003] A stepper motor driver is a device used to control a stepper motor. It converts the input electrical signal into a current signal suitable for the operation of the stepper motor. The main function of a stepper motor driver is to control the rotation speed, direction and position of the stepper motor.

[0004] On this basis, since the driving signal of the stepper motor usually contains frequent high-speed switching, this may cause more high-frequency noise on the power line and control line. In order to reduce the impact of these noises on the system, the stepper motor driver generally needs to have a filtering effect. In addition, considering that the stepper motor will generate electrostatic discharge during operation, especially when it moves at high speed or switches quickly, these electrostatic discharges may cause interference or damage to surrounding electronic equipment. Therefore, the stepper motor driver also needs to limit the impact of electrostatic discharge on surrounding electronic equipment.

[0005] At present, most of the stepper motor drivers on the market have complex internal circuits and are expensive. Therefore, in the field of stepper motor drive equipment, it is necessary to develop a stepper motor drive device with a simple structure, low price, anti-static and filtering effects. Utility Model Content

[0006] In view of the problem that the internal circuit of the stepper motor driver in the prior art is complex and expensive, the purpose of the utility model is to provide a stepper motor driving device based on an H-bridge, which includes an H-bridge motor driving chip, an LC filter component and a diode; the H-bridge motor driving chip has at least two H-bridge circuit channels; each H-bridge circuit channel has two input ports and two output ports; the H-bridge motor driving chip also has a power port and a ground port.

[0007] Two H-bridge circuit channels control a stepper motor; the H-bridge motor driver chip is used to control the four input ports of the same stepper motor to connect to the signal source, and the H-bridge motor driver chip is used to control the four output ports of the same stepper motor to connect to the stepper motor; each output port corresponds to an LC filter component and a diode; one end of each diode is connected between its corresponding output port and the stepper motor, and the other end is grounded; each LC filter component is connected between its corresponding output port and the stepper motor.

[0008] The utility model is further configured as follows: the LC filter component includes a first capacitor and an inductor; the inductor is connected in series between the output port and the stepper motor; one end of the first capacitor is connected between the output port and the stepper motor, and the other end is grounded.

[0009] The utility model is further configured to include a resistor, wherein a resistor is connected in series between each input port and the signal source.

[0010] The utility model is further configured as follows: it also includes a second capacitor, at least one of the second capacitors is provided, and when multiple second capacitors are provided, all the second capacitors are connected in parallel; one end of the second capacitor is grounded, and the other end is connected to the power port.

[0011] The utility model is further configured as follows: a plurality of the second capacitors are provided.

[0012] The utility model is further configured as follows: the second capacitor is arranged close to the power supply connected to the power port.

[0013] The utility model is further configured that: the inductor is a magnetic bead.

[0014] The utility model is further configured to include a power supply, which is grounded and connected to a power port.

[0015] The utility model is further configured as follows: the diode is a TVS diode.

[0016] The utility model is further configured as follows: the H-bridge motor driving chip is a GC3909 chip.

[0017] In summary, compared with the prior art, the utility model has the following beneficial effects: the H-bridge-based stepper motor driving device provided by the utility model includes an H-bridge motor driving chip, an LC filter component and a diode with a simple structure and low price, wherein the H-bridge motor driving chip drives the stepper motor, the LC filter component enables the entire device to have a filtering effect, and the diode enables the entire device to have an anti-static effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment.

[0019] In the figure: 1. H-bridge motor driver chip; 21. inductor; 22. first capacitor; 3. diode; 4. resistor; 5. second capacitor; 6. power supply; 7. signal source; 8. stepper motor. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] It should be noted that the terms "center", "up", "down", "horizontal", "left", "right", "front", "back", "lateral", "longitudinal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0022] like Figure 1 As shown, it is the basic structure of the preferred embodiment of the utility model. This embodiment provides a stepper motor driving device based on H-bridge, which includes an H-bridge motor driving chip 1, an LC filter component and a diode 3; the H-bridge motor driving chip 1 has at least two H-bridge circuit channels. Each H-bridge circuit channel is composed of four MOS tubes and has two input ports and two output ports; the H-bridge motor driving chip 1 also has a power port and a ground port.

[0023] Two H-bridge circuit channels control a stepper motor 8, the H-bridge motor driver chip 1 is used to control the four input ports of the same stepper motor 8 to connect to the signal source 7, and the H-bridge motor driver chip is used to control the four output ports of the same stepper motor 8 to connect to the stepper motor 8. Each output port corresponds to an LC filter component and a diode 3; one end of each diode 3 is connected between its corresponding output port and the stepper motor 8, and the other end is grounded; each LC filter component is connected between its corresponding output port and the stepper motor 8, and the LC filter component is only composed of a capacitor and an inductor.

[0024] The H-bridge-based stepper motor 8 driving device provided in this embodiment realizes the driving of the stepper motor 8 through the H-bridge motor driving chip 1 with a simple structure and a low price, makes the whole device have a filtering effect through the LC filter component with a simple structure and a low price, and makes the whole device have an anti-static effect through the diode 3 with a simple structure and a low price.

[0025] The H-bridge motor driver chip 1 described in this embodiment is a GC3909 chip, which has functions such as over-temperature protection, under-voltage protection, short-circuit protection, and over-current protection. It can work under a power supply voltage of 3.8-12V, and each port can provide a continuous output current of up to 1.5A. It should be noted that any motor driver chip with an H-bridge that is compatible with the GC3909 chip can replace the GC3909 chip as the H-bridge motor driver chip 1.

[0026] Specifically, the LC filter component includes a first capacitor 22 and an inductor 21; the inductor 21 is connected in series between the output port and the stepper motor 8; one end of the first capacitor 22 is connected between the output port and the stepper motor 8, and the other end is grounded. The ungrounded end of the first capacitor 22 is located on the side of the inductor 21 close to the H-bridge motor driver chip 1 or on the side of the inductor 21 close to the stepper motor 8. In this embodiment, the ungrounded end of the first capacitor 22 is located on the side of the inductor 21 close to the stepper motor 8. In this embodiment, the first capacitor 22 is 1000pF; the impedance of the inductor 21 in this embodiment is 330ohm, and the maximum DC current of the inductor 21 is 1.2A.

[0027] This embodiment further includes a resistor 4, and a resistor 4 is connected in series between each input port and the signal source 7 to limit the current and voltage output by the signal source 7 to protect the H-bridge motor driver chip 1 and reduce the influence of noise signals on the H-bridge motor driver chip 1. The resistor 4 in this embodiment is 100Ω.

[0028] This embodiment also includes a second capacitor 5, at least one of which is provided. When a plurality of second capacitors 5 are provided, all second capacitors 5 are connected in parallel, one end of the second capacitor 5 is grounded, and the other end is connected to the power port to filter out noise signals from the power supply 6 and reduce the influence of the power supply 6 on the H-bridge motor driver chip 1.

[0029] Specifically, a plurality of the second capacitors 5 are provided to improve the filtering effect on the noise signal of the power supply 6. In this embodiment, three second capacitors 5 are provided, and the second capacitor 5 is 10 μF.

[0030] Specifically, the second capacitor 5 is arranged close to the power supply 6 connected to the power port to improve the filtering effect of the noise signal of the power supply 6. When the second capacitor 5 is close to the power supply 6, it can respond to the voltage change of the power supply 6 more quickly, so it can more effectively filter out the high-frequency noise and fluctuation in the power supply 6. In contrast, if the second capacitor 5 is close to the H-bridge motor driver chip 1, the response time will be slower and the filtering effect may not be as good as when it is close to the power supply 6.

[0031] Specifically, this embodiment further includes a power supply 6 , and the power supply 6 is grounded and connected to a power supply 6 port.

[0032] Specifically, in this embodiment, the inductor 21 is a low-cost magnetic bead.

[0033] Specifically, the diode 3 is a TVS diode to improve the antistatic effect. The TVS diode is also called a transient voltage suppression diode. In this embodiment, the TVS diode is a D5V0P1B2LP-7B diode.

[0034] In summary, the H-bridge based stepper motor 8 driving device provided in this embodiment includes an H-bridge motor driving chip 1 with a simple structure and low price, an LC filter component and a diode 3, wherein the H-bridge motor driving chip 1 drives the stepper motor 8, the LC filter component enables the entire device to have a filtering effect, and the diode 3 enables the entire device to have an anti-static effect.

[0035] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A stepper motor driving device based on an H-bridge, characterized in that: It comprises an H-bridge motor driving chip (1), an LC filter component and a diode (3); the H-bridge motor driving chip (1) has at least two H-bridge circuit channels; each H-bridge circuit channel has two input ports and two output ports; The H-bridge motor driver chip (1) also has a power port and a ground port; Two H-bridge circuit channels control a stepper motor (8); the H-bridge motor driving chip (1) is used to control four input ports of the same stepper motor (8) to connect to a signal source (7); the H-bridge motor driving chip (1) is used to control four output ports of the same stepper motor (8) to connect to the stepper motor (8); each output port corresponds to an LC filter component and a diode (3); one end of each diode (3) is connected between its corresponding output port and the stepper motor (8), and the other end is grounded; each LC filter component is connected between its corresponding output port and the stepper motor (8).

2. The H-bridge stepper motor driving device according to claim 1, characterized in that: The LC filter component comprises a first capacitor (22) and an inductor (21); the inductor (21) is connected in series between the output port and the stepper motor (8); one end of the first capacitor (22) is connected between the output port and the stepper motor (8), and the other end is grounded.

3. The H-bridge stepper motor driving device according to claim 2, characterized in that: It also includes a resistor (4), and a resistor (4) is connected in series between each input port and the signal source (7).

4. The H-bridge based stepper motor driving device according to claim 3, characterized in that: It also comprises a second capacitor (5), at least one of which is provided, and when a plurality of the second capacitors (5) are provided, all the second capacitors (5) are connected in parallel; one end of the second capacitor (5) is grounded, and the other end is connected to the power port.

5. The H-bridge based stepper motor driving device according to claim 4, characterized in that: A plurality of the second capacitors (5) are provided.

6. A stepper motor driving device based on an H-bridge according to claim 4 or 5, characterized in that: The second capacitor (5) is arranged in close proximity to a power source (6) connected to the power port.

7. A stepper motor driving device based on an H-bridge according to claim 4 or 5, characterized in that: The inductor (21) is a magnetic bead.

8. A stepper motor driving device based on an H-bridge according to any one of claims 1 to 5, characterized in that: It comprises a power source (6), wherein the power source (6) is grounded and connected to a power port.

9. A stepper motor driving device based on an H-bridge according to any one of claims 1 to 5, characterized in that: The diode (3) is a TVS diode.

10. A stepper motor driving device based on an H-bridge according to any one of claims 1 to 5, characterized in that: The H-bridge motor driving chip (1) is a GC3909 chip.

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