A multi-channel constant current power supply controller

Abstract

The utility model discloses a kind of multi-channel constant current power supply controller, the controller includes main control module, communication conversion module and constant current drive module;Among them, constant current drive module is the constant current drive module of multi-channel;Main control module is connected with communication conversion module by serial communication pin communication, and main control module is used to issue constant current control information;The output end of communication conversion module connects constant current drive module, and communication conversion module is used for the conversion of different communication protocol;Constant current drive module is connected with main control module by communication conversion module, and the size and direction of current of constant current drive module are adjusted by the control of main control module received;Communication conversion module and constant current drive module are respectively accessed independent external power supply.The controller is used to realize the flexible control to the size and direction of the current of multiple winding coils, and is suitable for constructing small three-dimensional space magnetic field and other purposes.

Description

Technical Field

[0001] This application belongs to the field of constant current source controller technology, specifically referring to a multi-channel constant current power supply controller. Background Technology

[0002] Currently, magnetic field generation technology based on constant current source controllers mainly relies on the Biot-Savart law, which states that the strength and direction of the magnetic field are controlled by adjusting the magnitude and direction of the current. The uniaxial magnetic fields widely used in the market and scientific research are constructed using single-channel constant current source controllers, which offer advantages such as high precision and reliability.

[0003] However, with the continuous development of technology, the demand for multi-axis space magnetic fields is increasing. Traditional single-axis magnetic fields, due to their limited degrees of freedom, are unable to meet the application requirements of complex space magnetic fields. Although multi-axis magnetic fields can be constructed by combining multiple single-channel controllers, this method suffers from drawbacks such as complex equipment integration and slow response speed. In contrast, space magnetic field control achieved directly by a multi-channel constant current source controller has significant advantages in terms of system structure, response performance, and control flexibility. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this application provides a multi-channel constant current power controller for flexible control of the magnitude and direction of current in multiple winding coils, suitable for applications such as constructing small three-dimensional spatial magnetic fields.

[0005] This utility model provides a multi-channel constant current power supply controller, which includes a main control module, a communication conversion module, and a constant current drive module. The main control module is connected to the communication conversion module via a serial communication pin, and the main control module is used to send constant current control information. The output of the communication conversion module is connected to the constant current drive module, and the communication conversion module is used for the conversion of different communication protocols; The constant current drive module is connected to the main control module through the communication conversion module, and the constant current drive module receives control from the main control module to adjust the magnitude and direction of the output current; The communication conversion module and the constant current drive module are each connected to an independent external power supply.

[0006] Furthermore, according to the multi-channel constant current power controller provided in this utility model application, the communication conversion module includes at least a first communication interface and a second communication interface, the first communication interface being connected to the constant current drive module, and the second communication interface being connected to the main control module; The first communication interface includes a positive communication terminal A+ interface, a negative communication terminal B- interface, and a common terminal COM interface; the second communication interface includes an input terminal RX interface, an output terminal TX interface, a power input positive terminal VCC interface, and a power ground terminal GND interface. The communication positive terminal A+ and the communication negative terminal B- are connected to the constant current drive module, and the common terminal COM is connected to the constant current drive module via a common ground; the input terminal RX and the output terminal TX are connected to the main control module, and the power input positive terminal VCC and the power ground terminal GND are connected to an independent external power supply.

[0007] Furthermore, according to the multi-channel constant current power controller provided in this utility model application, the constant current drive module includes a plurality of constant current drive units, and each of the constant current drive units is connected in parallel to the first communication interface of the communication conversion module. Furthermore, according to the multi-channel constant current power controller provided in this utility model application, the constant current drive module includes three constant current drive units, and the three constant current drive units are connected in parallel to the output terminal of the communication conversion module. Furthermore, according to the multi-channel constant current power controller provided in this utility model application, the constant current drive unit includes a DIP switch area, a communication interface, a limit interface, a power interface, an input signal interface, and a voltage detection interface; The DIP switch area is used for address setting and multi-device addressing; the communication interface is used to connect to the output of the communication conversion module; the power interface is connected to an independent external power supply to provide power to the constant current drive unit; the input signal interface is connected to the main control module to control the current direction; and the voltage detection interface is used to connect to a coil to generate a magnetic field.

[0008] Furthermore, according to the multi-channel constant current power controller provided in this utility model application, the DIP switch area includes a set of 8-bit DIP switches; wherein, the 8th DIP switch is used to select the control mode. When the 8th DIP switch is set to OFF, analog / digital signal control is enabled; when the 8th DIP switch is set to ON, bus communication mode is enabled. The other 7-bit DIP switch is used to set the communication address of the constant current drive unit, and multi-device addressing can be achieved through different ON / OFF combinations of the 7-bit DIP switch. Furthermore, according to the multi-channel constant current power controller provided in this utility model application, the 8th DIP switch of the three constant current drive units is set to ON, and the addresses of the three constant current drive units are set to 01, 02 and 03 respectively. Among them, the first to seventh DIP switches of the constant current drive unit with address 01 are all set to OFF; The first DIP switch of the constant current drive unit with address 02 is set to ON, and the second to seventh DIP switches are all set to OFF. The first DIP switch of the constant current drive unit with address 03 is set to OFF, the second DIP switch is set to ON, and the third to seventh DIP switches are all set to OFF.

[0009] Furthermore, according to the multi-channel constant current power controller provided in this utility model application, the constant current drive unit uses the 485 communication protocol; the communication interface includes an RS485 bus A-line interface, an RS485 bus B-line interface, and a common terminal COM interface. The A-line interface is connected to the positive communication terminal A+ interface, the B-line interface is connected to the negative communication terminal B- interface, the common terminal COM interface of the communication interface is connected to the common terminal COM interface of the first communication interface, and the constant current drive unit and the communication conversion module are connected to the same ground. Furthermore, according to the multi-channel constant current power controller provided in this utility model application, the input signal interface includes a first input signal terminal IN1 interface, a second input signal terminal IN2 interface, a third input signal terminal IN3 interface, and a common terminal COM interface; The first input signal terminal IN1 interface is used for the input of the first analog signal, PWM or frequency signal, or as the in-phase terminal of a differential signal; The second input signal terminal IN2 is used for the second signal input or as a differential signal inverting terminal; The third input signal terminal IN3 interface is used for direction control or enable control; The common COM interface is used as the common ground for signals. Furthermore, according to the multi-channel constant current power controller provided in this utility model application, the third input signal terminal IN3 of the input signal interface is connected to the main control module to receive current direction control from the main control module.

[0010] The beneficial effects of this utility model are as follows: The multi-channel constant current power controller provided in this utility model application consists of a main control module, a communication conversion module, and a constant current drive module, which together realize the coordinated output of multi-channel current. The serial communication pin of the main control module is connected to the corresponding signal terminal of the communication conversion module, and the output terminal of the communication conversion module is connected to the bus interface of the constant current drive module in parallel. The main control module controls the current of the constant current drive module in multiple channels, and can independently adjust the current magnitude and direction of each channel to achieve precise control of the intensity and direction of the three-dimensional magnetic field. Compared with the traditional single-axis magnetic field control scheme, the three-axis magnetic field constructed by this controller has higher degrees of freedom and can adapt to more complex magnetic field application requirements. In addition, compared with the method of using multiple independent single-axis controllers to realize a three-axis magnetic field, this new invention adopts an integrated multi-channel design, which makes the system structure simpler, the connection more convenient, and significantly improves the collaborative control capability and overall response consistency between channels. Attached Figure Description

[0011] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the multi-channel constant current power supply controller provided in this embodiment.

[0013] Figure 2 This is a schematic diagram of the communication conversion module proposed in this embodiment.

[0014] Figure 3 This is a schematic diagram of the constant current drive unit provided in this embodiment.

[0015] The components in the diagram are labeled as follows: main control module 10, communication conversion module 20, constant current drive module 30, first communication interface 21, second communication interface 22, DIP switch area 31, communication interface 32, limit interface 33, power interface 34, input signal interface 35, and voltage detection interface 36. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0017] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0018] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0019] The embodiments of this application will now be further described in conjunction with the accompanying drawings and specific implementation details.

[0020] This embodiment provides a multi-channel constant current power supply controller for flexible control of the magnitude and direction of current in multiple winding coils, suitable for applications such as constructing small three-dimensional spatial magnetic fields. Addressing the limitations of traditional small magnetic field current generators, which primarily utilize independent single-channel constant current controllers and thus can only generate uniaxial magnetic fields and cannot achieve precise three-dimensional magnetic field control, this embodiment provides a multi-channel constant current power supply controller that uses serial communication to achieve independent control of multiple constant current sources and decoupling of the target three-dimensional magnetic field through a main controller. It precisely controls the current direction and magnitude of each channel current module. This structure enables precise control of the magnetic field in any region within three-dimensional space, offering greater control freedom and flexibility.

[0021] Figure 1 This is a schematic diagram of the multi-channel constant current power supply controller provided in this embodiment.

[0022] like Figure 1As shown, the multi-channel constant current power supply controller includes a main control module 10, a communication conversion module 20, and a constant current drive module 30, which together realize the coordinated output of multi-channel current. The constant current drive module 30 is a multi-channel constant current drive module. The main control module 10 is connected to the communication conversion module 20 via a serial communication pin, and the main control module 10 is used to send constant current control information. The output terminal of the communication conversion module 20 is connected to the constant current drive module 30, and the communication conversion module 20 is used for conversion between different communication protocols. The constant current drive module 30 is connected to the main control module 10 through the communication conversion module 20, and the constant current drive module 30 receives control from the main control module 10 to adjust the magnitude and direction of the output current. The communication conversion module 20 and the constant current drive module 30 are each connected to an independent external power supply.

[0023] Specifically, the serial communication pin of the main control module 10 is connected to the corresponding signal terminal of the communication conversion module 20, and the output terminal of the communication conversion module 20 is connected in parallel to the bus interface of the constant current drive module 30. All modules are connected to a common ground.

[0024] Figure 2 This is a schematic diagram of the communication conversion module 20 proposed in this embodiment.

[0025] like Figure 2 As shown, the communication conversion module 20 includes at least a first communication interface 21 and a second communication interface 22. The first communication interface 21 is connected to the constant current drive module 30, and the second communication interface 22 is connected to the main control module 10. The first communication interface 21 includes a positive communication terminal A+ interface, a negative communication terminal B- interface, and a common terminal COM interface; the second communication interface 22 includes an input terminal RX interface, an output terminal TX interface, a power input positive terminal VCC interface, and a power ground terminal GND interface. The positive communication terminal A+ and the negative communication terminal B- are connected to the constant current drive module 30, and the common terminal COM is connected to the constant current drive module 30 via a common ground. The input terminal RX and the output terminal TX are connected to the main control module 10, and the power input positive terminal VCC and the power ground terminal GND are connected to an independent external power supply.

[0026] Specifically, in this embodiment, the Arduino Mega 2560 chip is used as the main control module 10, and a TTL to RS485 converter module is used as the communication conversion module 20 for illustration. Figure 1 , Figure 2As shown, RX1 (pin 19) and TX1 (pin 18) on the Mega board are connected to the input RX interface and output TX interface of the TTL to RS485 module, respectively; the communication positive terminal A+ and communication negative terminal B- of the TTL to RS485 module are connected in parallel to the interface of the constant current drive module 30. All devices must be connected to a common ground, and the TTL to RS485 module and the constant current drive module 30 must be connected to external power supplies respectively.

[0027] In this embodiment, a TTL to RS485 converter is used to ensure that the communication line is in RS485 communication protocol mode. One end of the communication conversion module 20 communicates with the main control module 10 via a serial port, and the other end is connected to the communication interface of the constant current drive module 30, realizing the conversion of signals from serial port to RS485 communication protocol, and has good anti-interference and long-distance communication capabilities. The TTL to RS485 converter needs to be powered independently and share a common ground with the system when working.

[0028] like Figure 1 As shown, in this embodiment, the constant current driving module 30 includes a plurality of constant current driving units, and each of the constant current driving units is connected in parallel to the first communication interface 21 of the communication conversion module 20.

[0029] This embodiment uses the constant current drive module 30, which includes three constant current drive units, as an example for illustration. The three constant current drive units are connected in parallel to the output terminal of the communication conversion module 20.

[0030] Figure 3 This is a schematic diagram of the constant current drive unit provided in this embodiment.

[0031] like Figure 3 As shown, the constant current drive unit has high-performance DC output capability. The constant current drive unit includes a DIP switch area 31, a communication interface 32, a limit interface 33, a power interface 34, an input signal interface 35, and a voltage detection interface 36. The DIP switch area 31 is used for address setting and multi-device addressing; the communication interface 32 is used to connect to the output terminal of the communication conversion module 20; the power interface 34 is connected to an independent external power supply to provide power to the constant current drive unit; the input signal interface 35 is connected to the main control module 10 to control the current direction; and the voltage detection interface 36 is used to connect a coil to generate a magnetic field.

[0032] Specifically, the core configuration of the constant current drive unit is implemented using a set of 8-bit DIP switches. That is, the DIP switch area 31 includes a set of 8-bit DIP switches; wherein, the 8th DIP switch is used to select the control mode. When the 8th DIP switch is set to OFF, analog / digital signal control is enabled; when the 8th DIP switch is set to ON, bus communication mode is enabled, supporting 485 communication protocol / CAN communication protocol; the other 7 DIP switches are used to set the communication address of the constant current drive unit, and multi-device addressing is achieved through different ON / OFF combinations of the 7 DIP switches.

[0033] The constant current drive unit uses the RS485 communication protocol; the communication interface 32 includes an RS485 bus A-line interface, an RS485 bus B-line interface, and a common terminal COM interface. like Figure 1 As shown, the A-line interface of the RS485 bus of each constant current drive unit is connected to the positive communication terminal A+ interface, the B-line interface of the RS485 bus is connected to the negative communication terminal B- interface, the common terminal COM interface of the communication interface 32 is connected to the common terminal COM interface of the first communication interface 21, and the constant current drive unit and the communication conversion module 20 are connected to the same ground to establish a stable differential communication link.

[0034] The input signal interface 35 includes a first input signal terminal IN1, a second input signal terminal IN2, a third input signal terminal IN3, and a common terminal COM. The first input signal terminal IN1 is used for inputting a first analog signal, PWM, or frequency signal, or as a differential signal in-phase input. The second input signal terminal IN2 is used for inputting a second signal, or as a differential signal inverting input. The third input signal terminal IN3 is used for direction control or enable control. The common terminal COM is used as a common ground terminal for the signal. like Figure 1 , Figure 3 As shown, the power interface 34 supports a wide voltage DC input of 9–24V. The positive terminal of the power interface 34 is connected to the “9–24V” terminal, and the negative terminal of the power interface 34 is connected to “PGND” to provide working power to the module.

[0035] In this embodiment, to enable multi-device communication, the RS485 communication address of each constant current drive unit needs to be set via a DIP switch. The 8th DIP switch of each of the three constant current drive units is set to ON, and the addresses of the three constant current drive units are set to 01, 02, and 03, respectively. Among them, the first to seventh DIP switches of the constant current drive unit with address 01 are all set to OFF; The first DIP switch of the constant current drive unit with address 02 is set to ON, and the second to seventh DIP switches are all set to OFF. The first DIP switch of the constant current drive unit with address 03 is set to OFF, the second DIP switch is set to ON, and the third to seventh DIP switches are all set to OFF.

[0036] In the Arduino program, the same baud rate, parity, and stop bits should be configured, and each slave address should be specified as 01, 02, and 03 to establish stable communication. The current communication link allows for current value setting but does not yet include direction control. Therefore, to achieve direction control, the analog ports A0, A1, and A2 on the Mega board must be connected to the third input signal terminal IN3 of the three constant current drive units, i.e., the direction control input terminal, to control the current direction.

[0037] Finally, as Figure 1 As shown, coils with fixed resistance are connected to the output terminals (i.e., voltage detection interface 36) of each constant current driving unit, and the main control module 10 sends corresponding current control signals to each constant current driving unit. The multi-channel constant current source controller can then output a preset current value, which, after flowing through the coil, excites a magnetic field of corresponding intensity. By arranging multiple coils in a three-dimensional conical structure, a spatial magnetic field with specific distribution characteristics can be synthesized in the target area, thereby achieving flexible control over the entire three-dimensional magnetic field morphology.

[0038] The multi-channel constant current power controller provided in this embodiment has an address setting function for each constant current drive unit to enable multi-device communication. By configuring the address DIP switches inside the constant current drive units, the three constant current drive units can be set to different communication addresses (such as 01, 02, and 03) and RS485 communication mode can be used. In the program of the main control module 10, consistent communication parameters (including baud rate, parity bit, and stop bit) need to be configured, and the addresses of each constant current drive unit need to be specified to establish stable communication.

[0039] The current communication line supports independent setting of the output current value of each channel. To achieve flexible control of the current direction, an additional connection is established between the three analog output ports of the main control module 10 and the direction control input terminals of each constant current drive unit, and the switching control of the current direction is achieved by outputting high and low level signals.

[0040] The multi-channel constant current power controller provided in this utility model application consists of a main control module 10, a communication conversion module 20, and a constant current drive module 30, which together realize the coordinated output of multi-channel current. The serial communication pin of the main control module 10 is connected to the corresponding signal terminal of the communication conversion module 20, and the output terminal of the communication conversion module 20 is connected to the bus interface of the constant current drive module 30 in parallel. The main control module 10 controls the current of the constant current drive module 30 in multiple channels, and can independently adjust the current magnitude and direction of each channel to achieve precise control of the intensity and direction of the three-dimensional magnetic field. Compared with the traditional single-axis magnetic field control scheme, the three-axis magnetic field constructed by this controller has higher degrees of freedom and can adapt to more complex magnetic field application requirements. In addition, compared with the method of using multiple independent single-axis controllers to realize a three-axis magnetic field, this new invention adopts an integrated multi-channel design, which makes the system structure simpler, the connection more convenient, and significantly improves the collaborative control capability and overall response consistency between channels.

[0041] Regarding communication methods, traditional multi-channel constant current source controllers often rely on non-differential single-ended signals or software analog communication for signal transmission. These methods have weak anti-interference capabilities, insufficient signal stability, and are easily affected by the environment. The multi-channel constant current power supply controller provided in this application adopts the RS485 differential communication protocol. Through physical differential signal transmission, it effectively suppresses environmental interference, significantly improving communication reliability and anti-interference capabilities, thereby ensuring stable transmission of control signals in complex industrial environments.

[0042] Furthermore, this controller supports synchronous control of multiple current directions with a high degree of coordination and integration. The controller issues commands through a control terminal, which are then transmitted to each constant current drive unit via the communication conversion module 20, achieving synchronous output of multiple currents. This effectively reduces the risk of signal conflict and provides higher system stability and control reliability.

[0043] Meanwhile, the multi-channel constant current source control technology proposed in this invention possesses excellent system scalability and functional adaptability. Its application is not limited to the construction of triaxial magnetic fields but can also be extended to the current control field of multi-channel magnetorheological dampers. The multi-channel constant current source controller has the ability to independently regulate the current of each output channel, and can precisely set the magnitude and direction of the current in each path. This characteristic meets the current control requirements of multi-channel magnetorheological dampers. Based on this technological advantage, this controller shows broad application prospects in engineering applications such as vibration suppression and vibration reduction control.

[0044] The multi-channel constant current power controller involved in this invention not only constructs a triaxial spatial magnetic field but also possesses flexible magnetic field configuration capabilities. For example, by arranging three conductive coils in a cylindrical, coaxial, coincident manner, the controller can integrate and generate a single-axis synthetic magnetic field. Compared to traditional single-axis magnetic field control schemes, this synthetic magnetic field has a wider effective control range and can achieve precise and fine control of the synthetic magnetic field by adjusting the current magnitude of each channel.

[0045] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0046] The above provides a detailed description of a multi-channel constant current power controller provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A multi-channel constant current power supply controller, characterized in that, The multi-channel constant current power controller includes a main control module, a communication conversion module, and a constant current drive module; wherein, the constant current drive module is a multi-channel constant current drive module. The main control module is connected to the communication conversion module via a serial communication pin, and the main control module is used to send constant current control information. The output of the communication conversion module is connected to the constant current drive module, and the communication conversion module is used for the conversion of different communication protocols; The constant current drive module is connected to the main control module through the communication conversion module, and the constant current drive module receives control from the main control module to adjust the magnitude and direction of the output current; The communication conversion module and the constant current drive module are each connected to an independent external power supply.

2. The multi-channel constant current power supply controller according to claim 1, characterized in that, The communication conversion module includes at least a first communication interface and a second communication interface, wherein the first communication interface is connected to the constant current drive module and the second communication interface is connected to the main control module; The first communication interface includes a positive communication terminal A+ interface, a negative communication terminal B- interface, and a common terminal COM interface; the second communication interface includes an input terminal RX interface, an output terminal TX interface, a power input positive terminal VCC interface, and a power ground terminal GND interface. The communication positive terminal A+ and the communication negative terminal B- are connected to the constant current drive module, and the common terminal COM is connected to the constant current drive module via a common ground; the input terminal RX and the output terminal TX are connected to the main control module, and the power input positive terminal VCC and the power ground terminal GND are connected to an independent external power supply.

3. The multi-channel constant current power supply controller according to claim 2, characterized in that, The constant current drive module includes several constant current drive units, and each constant current drive unit is connected in parallel to the first communication interface of the communication conversion module.

4. The multi-channel constant current power supply controller according to claim 3, characterized in that, The constant current drive module includes three constant current drive units, which are connected in parallel to the output of the communication conversion module.

5. The multi-channel constant current power supply controller according to claim 4, characterized in that, The constant current drive unit includes a DIP switch area, a communication interface, a limit interface, a power interface, an input signal interface, and a voltage detection interface. The DIP switch area is used for address setting and multi-device addressing; the communication interface is used to connect to the output of the communication conversion module; the power interface is connected to an independent external power supply to provide power to the constant current drive unit; the input signal interface is connected to the main control module to control the current direction; and the voltage detection interface is used to connect to a coil to generate a magnetic field.

6. The multi-channel constant current power supply controller according to claim 5, characterized in that, The DIP switch area includes a set of 8-bit DIP switches; wherein, the 8th DIP switch is used to select the control mode. When the 8th DIP switch is set to OFF, analog / digital signal control is enabled; when the 8th DIP switch is set to ON, bus communication mode is enabled. The other 7-bit DIP switch is used to set the communication address of the constant current drive unit, and multi-device addressing can be achieved through different ON / OFF combinations of the 7-bit DIP switch.

7. The multi-channel constant current power supply controller according to claim 6, characterized in that, The 8th DIP switch of each of the three constant current driving units is set to ON, and the addresses of the three constant current driving units are set to 01, 02 and 03 respectively. Among them, the first to seventh DIP switches of the constant current drive unit with address 01 are all set to OFF; The first DIP switch of the constant current drive unit with address 02 is set to ON, and the second to seventh DIP switches are all set to OFF. The first DIP switch of the constant current drive unit with address 03 is set to OFF, the second DIP switch is set to ON, and the third to seventh DIP switches are all set to OFF.

8. The multi-channel constant current power supply controller according to claim 5, characterized in that, The constant current drive unit uses the RS485 communication protocol; the communication interface includes an RS485 bus A-line interface, an RS485 bus B-line interface, and a common terminal COM interface. The A-line interface is connected to the positive communication terminal A+ interface, the B-line interface is connected to the negative communication terminal B- interface, the common terminal COM interface of the communication interface is connected to the common terminal COM interface of the first communication interface, and the constant current drive unit and the communication conversion module are connected to the same ground.

9. The multi-channel constant current power supply controller according to claim 5, characterized in that, The input signal interface includes a first input signal terminal IN1 interface, a second input signal terminal IN2 interface, a third input signal terminal IN3 interface, and a common terminal COM interface; The first input signal terminal IN1 interface is used for the input of the first analog signal, PWM or frequency signal, or as the in-phase terminal of a differential signal; The second input signal terminal IN2 is used for the second signal input or as a differential signal inverting terminal; The third input signal terminal IN3 interface is used for direction control or enable control; The common COM interface is used as the common ground for signals.

10. The multi-channel constant current power supply controller according to claim 9, characterized in that, The third input signal terminal IN3 of the input signal interface is connected to the main control module and receives current direction control from the main control module.

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