Optical communication servo control system

Abstract

The utility model discloses an optical communication servo control system, which comprises a power supply module, a driving module, an optical communication module, a control unit and a motor, the power supply module adopts a master-slave 1 + N redundant structure, the power supply module is connected with the driving module and the optical communication module to supply power to the driving module and the optical communication module, the driving module is connected with the motor to drive the motor to work and generate an optical feedback signal, and the control unit is connected with one or more motors to collect information of the motor and generate an electric control instruction. And the optical communication module is used for realizing signal two-way transmission of converting and transmitting an optical feedback signal to the control unit and converting and transmitting an electric control instruction to the driving module based on photoelectric conversion. According to the optical communication servo control system provided by the utility model, the power supply module adopts a redundancy architecture, the 1 + N redundancy power supply design ensures that the system operation is not influenced by a single-point fault, the modular structure supports hot plug replacement, and the average maintenance time is shortened.

Description

Technical Field

[0001] This utility model belongs to the field of integrated circuit technology, specifically relating to an optical communication servo control system. Background Technology

[0002] Traditional drive control systems typically employ an integrated design, leading to the following problems:

[0003] 1. Low power management efficiency: The integrated power module generates a lot of heat under high load, which affects system stability.

[0004] 2. Sensitive to electromagnetic interference (EMI): The motor drive signal is susceptible to interference, which can lead to a decrease in control accuracy.

[0005] 3. Poor scalability: System upgrades or maintenance require complete replacement, resulting in high costs.

[0006] In existing technologies, some driver modules adopt a discrete design, but the coordination and optimization between modules are insufficient, and problems such as communication delay and uneven heat dissipation still exist.

[0007] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0008] The purpose of this invention is to provide an optical communication servo control system that can improve its power management efficiency, electromagnetic interference, and scalability.

[0009] To achieve the above objectives, a specific embodiment of this utility model provides an optical communication servo control system, including: a power supply module, a drive module, an optical communication module, a control unit, and a motor; the power supply module adopts a master-slave 1+N redundant structure, multiple drive modules are provided, the power supply module is connected to the drive module and the optical communication module to supply power to the drive module and the optical communication module, the drive module is connected to the corresponding motor to drive the motor to work and generate optical feedback signals, the control unit is connected to the motor to collect motor information and generate electrical control commands, the optical communication module is connected to the drive module through an optical fiber, and the optical communication module is also connected to the control unit, the optical communication module is used to realize bidirectional signal transmission based on photoelectric conversion to convert and transmit the optical feedback signal to the control unit and the electrical control command to the drive module.

[0010] In one or more embodiments of the present invention, the optical communication module has multiple control interfaces to connect to multiple control units, and the optical communication module has multiple drive interfaces to connect to multiple drive modules.

[0011] In one or more embodiments of this utility model, the optical communication module has six control interfaces and six drive interfaces.

[0012] In one or more embodiments of this utility model, the control unit is connected to the optical communication module via a SCSI-36 line.

[0013] In one or more embodiments of this utility model, the optical communication module includes one or more photoelectric converters, each photoelectric converter including a first signal conversion unit and a second signal conversion unit; the first signal conversion unit is used to convert electrical control commands into optical command signals that are transmitted to the drive module, and the second signal conversion unit is used to convert optical feedback signals output by the drive module into electrical feedback signals that are transmitted to the control unit.

[0014] In one or more embodiments of the present invention, the first signal conversion unit includes a first differential-to-single-ended module, a first single-ended-to-differential module, and an optical emission module connected in sequence. The first differential-to-single-ended module is used to convert electrical control commands into a first single-ended signal, the first single-ended-to-differential module is used to convert the first single-ended signal into a first low-voltage differential signal, and the optical emission module is used to convert the first low-voltage differential signal into an optical command signal for output.

[0015] In one or more embodiments of the present invention, the second signal conversion unit includes a second single-ended to differential module, a second differential to single-ended module, and an optical receiving module connected in sequence. The optical receiving module is used to convert the optical feedback signal into a second low-voltage differential signal, the second differential to single-ended module is used to convert the second low-voltage differential signal into a second single-ended signal, and the second single-ended to differential module is used to convert the second single-ended signal into an electrical feedback signal.

[0016] In one or more embodiments of the present invention, the photoelectric converter further includes an interference detection unit, which is connected to a first differential-to-single-ended module to perform signal processing based on a first single-ended signal to generate a state characterization signal.

[0017] In one or more embodiments of this utility model, the interference detection unit includes an XOR gate, the first differential-to-single-ended module is also used to convert the electrical control command into a third single-ended signal, the first input terminal and the second input terminal of the XOR gate receive the first single-ended signal and the third single-ended signal respectively, and the output terminal of the XOR gate outputs a state characterization signal.

[0018] In one or more embodiments of this utility model, the interference detection unit further includes a timer and a diode. The input terminal of the timer is connected to the output terminal of an XOR gate to receive a state characterization signal. The cathode of the diode is connected to the output terminal of the timer, and the anode of the diode is connected to the power supply voltage.

[0019] Compared with existing technologies, the optical communication servo control system of this invention adopts a fiber optic communication architecture, which has excellent anti-interference performance and completely avoids the electromagnetic interference problems of traditional copper cable transmission. The optical signal transmission is not affected by the strong electromagnetic environment of the workshop (such as frequency converters and welding equipment). The power module adopts a redundant architecture, and the 1+N redundant power supply design ensures that a single point of failure does not affect the system operation. The modular structure supports hot-swappable replacement, shortening the mean time to repair. The multi-interface design of the optical communication module meets the needs of multi-axis collaborative control. The optical fiber can be cut as needed, facilitating the connection of multiple devices and adapting to different application scenarios, with excellent scalability and flexibility. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a circuit diagram of an optical communication servo control system according to one embodiment of the present invention.

[0022] Figure 2 This is a circuit diagram of an optical communication module in one embodiment of the present invention. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0024] The terms "coupled," "connected," or "linked" in this specification include both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as an electrical conduction medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in utility models, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0025] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this disclosure. Therefore, the following detailed description should not be considered limiting.

[0026] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0027] For the purposes of this disclosure, the phrase “A and / or B” means (A), (B), or (A and B). For the purposes of this disclosure, the phrase “A, B and / or C” means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0028] Various components and devices may be referred to or shown in the singular (e.g., “transistor”, “transistor”, “switch”, etc.) in this document, but only for the convenience of discussion, and any element referred to in the singular may include multiple such elements as taught herein.

[0029] The description uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," each of which may refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used with respect to embodiments of this disclosure are synonymous.

[0030] like Figure 1As shown in the figure, an optical communication servo control system according to an embodiment of the present invention includes: a power supply module 10, a drive module 20, an optical communication module 30, a control unit 40, and a motor 50.

[0031] The power module 10 is connected to the drive module 20 and the optical communication module 30 to supply power to the drive module 20 and the optical communication module 30.

[0032] In one embodiment, the power module 10 adopts a master-slave 1+N redundancy structure, where N is greater than 1. The power module 10 consists of one master module and N slave modules. The redundancy mechanism of the power module 10 is as follows: at least one of the N slave modules is a redundant backup (i.e., "+1"). In case of failure, the backup module takes over the load to ensure continuous power supply to the system.

[0033] In one embodiment, a master module can provide control power (24VDC) to the drive module 20 and the optical communication module 30, while simultaneously providing rectified high-voltage power to the drive module 20, with a maximum output power of 45kW. Multiple drive modules 20 can be powered by multiple slave modules. This structure ensures that when a single drive module 20 fails, the other drive modules 20 can still operate normally, and the system can be restored simply by replacing the faulty module, significantly improving the reliability and ease of maintenance of the equipment.

[0034] The drive module 20 is connected to the corresponding motor 50 to drive the motor 50 and generate an optical feedback signal. The control unit 40 is connected to the motor 50 to collect information from the motor 50 and generate electrical control commands. Each drive module 20 drives one motor 50. The control unit 40 can control multiple drive modules 20 through the optical communication module 30. The optical communication module 30 is connected to the drive module 20 via optical fiber and is also connected to the control unit 40. In one embodiment, the control unit 40 is connected to the optical communication module 30 via a SCSI-36 cable. The optical communication module 30 is used for bidirectional signal transmission based on photoelectric signal conversion, converting and transmitting the optical feedback signal to the control unit 40 and converting and transmitting the electrical control commands to the drive module 20.

[0035] In one embodiment, the driving module includes a voltage conversion circuit, an FPGA controller, a sampling circuit, and a PWM conditioning circuit. The voltage conversion circuit is connected to the power supply module 10 for voltage conversion and to the FPGA controller for power supply. The FPGA controller receives optical command signals from the optical communication module 30 to control the PWM conditioning circuit to drive the motor 50. The sampling circuit is used to collect information (current, voltage, speed) from the motor 50 and generate sampling signals that are sent to the FPGA controller. The FPGA controller generates optical feedback signals based on the sampling signals.

[0036] In other embodiments, the optical communication servo control system further includes a power supply selection logic circuit. The power supply selection logic circuit is connected to multiple slave modules and multiple drive modules. When a slave module or drive module fails, the power supply selection logic circuit can disconnect the path between the failed slave module and the normal drive module and switch the normal slave module to the normal drive module for power supply. Alternatively, it can disconnect the path between the normal slave module and the failed drive module and switch the normal slave module to another normal drive module for continued power supply.

[0037] The circuit employs a fiber optic connection scheme, and the communication optical fibers between all modules can be cut to length according to on-site installation requirements and support hot-swapping replacement. This design not only simplifies the installation process but also facilitates later maintenance and system expansion, making it particularly suitable for industrial automated production lines that require frequent layout adjustments.

[0038] In one embodiment, the optical communication module 30 has multiple control interfaces to connect to the control unit 40 (the control unit 40 also has multiple corresponding interfaces), and the optical communication module 30 has multiple drive interfaces (SCSI interfaces) to connect to multiple drive modules 20 respectively, so that multiple drive modules 20 can be controlled by one control unit 40. In one embodiment, the optical communication module 30 has six control interfaces and six drive interfaces. The control unit 40 can connect to any one of the control interfaces, and a communication link with a single drive module 20 can be established by connecting the corresponding drive interface to the target drive module 20. If the control unit 40 connects to six control interfaces, it can establish communication links with up to six drive modules 20 (the design of six control interfaces and six drive interfaces can meet the synchronous control requirements of up to six high-precision feed axes for typical CNC machine tool application scenarios).

[0039] like Figure 2 As shown, the optical communication module 30 includes multiple photoelectric converters 31. In one embodiment, six photoelectric converters 31 are provided, corresponding to six control interfaces and six drive interfaces.

[0040] The photoelectric converter 31 includes a first signal conversion unit and a second signal conversion unit; the first signal conversion unit is used to convert electrical control commands into optical command signals that are transmitted to the drive module 20, and the second signal conversion unit is used to convert the optical feedback signals output by the drive module 20 into electrical feedback signals that are transmitted to the control unit 40.

[0041] The first signal conversion unit includes a first differential-to-single-ended module 311, a first single-ended-to-differential module 312, and an optical transmitter module TX connected in sequence. The first differential-to-single-ended module 311 is used to convert electrical control commands into a first single-ended signal TX1. The first single-ended-to-differential module 312 is used to convert the first single-ended signal TX1 into first low-voltage differential signals O_TX1+ and O_TX1-. The optical transmitter module TX is used to convert the first low-voltage differential signals O_TX1+ and O_TX1- into optical command signals for output.

[0042] The second signal conversion unit includes a second single-ended to differential module 313, a second differential to single-ended module 314, and an optical receiver module RX connected in sequence. The optical receiver module RX is used to convert the optical feedback signal into second low-voltage differential signals O_RX1+ and O_RX1-. The second differential to single-ended module 314 is used to convert the second low-voltage differential signals O_RX1+ and O_RX1- into a second single-ended signal RX1. The second single-ended to differential module 313 is used to convert the second single-ended signal RX1 into an electrical feedback signal.

[0043] In one embodiment, the first differential-to-single-ended module 311 is constructed using a DS34C86 chip and can achieve differential-to-single-ended conversion through different enable configurations. The second single-ended-to-differential module 313 is constructed using a DS34C87 chip and can achieve single-ended-to-differential conversion through enable configuration. The first single-ended-to-differential module 312 and the second differential-to-single-ended module 314 are constructed using an MS2111 chip and can achieve single-ended-to-differential and differential-to-single-ended conversion through enable configuration.

[0044] In one embodiment, the electronic control command has a set of differential signals TX1+, TX1- and another set of differential signals nTX1+, nTX1-. The first differential-to-single-ended module 311 converts the differential signals TX1+, TX1- into a first single-ended signal TX1, and the first differential-to-single-ended module 311 converts the differential signals nTX1+, nTX1- into a third single-ended signal nTX1.

[0045] The photoelectric converter 31 also includes an interference detection unit, which is connected to the first differential-to-single-ended module 311 to perform signal processing based on the first single-ended signal TX1 and the third single-ended signal nTX1 to generate a state characterization signal.

[0046] The interference detection unit includes an XOR gate (NOX), a timer, and a diode. The first and second input terminals of the XOR gate (NOX) receive a first single-ended signal TX1 and a third single-ended signal nTX1, respectively. The output terminal of the XOR gate (NOX) outputs a state characterization signal. The input terminal of the timer is connected to the output terminal of the XOR gate and receives the state characterization signal. The cathode of the diode is connected to the output terminal of the timer, and the anode of the diode is connected to the power supply voltage.

[0047] Under normal operating conditions, the third single-ended signal nTX1 and the first single-ended signal TX1 are 0 and 1 respectively (two different values), and the state characterization signal is 1. When there is interference, the third single-ended signal nTX1 and the first single-ended signal TX1 will be 1 or 0 at the same time, and the state characterization signal will be 0.

[0048] The status characterization signal is input to the timer, which is used to delay the status characterization signal. The output of the timer controls whether the LED light up, so that the LED display status can be used to determine whether there is interference. If the status characterization signal is 0, the LED will be lit, thus indicating that there is interference.

[0049] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An optical communication servo control system, characterized in that, include: The system comprises a power supply module, a drive module, an optical communication module, a control unit, and a motor. The power supply module adopts a master-slave 1+N redundant structure. Multiple drive modules are provided. The power supply module is connected to the drive module and the optical communication module to supply power to them. The drive module is connected to the corresponding motor to drive the motor and generate optical feedback signals. The control unit is connected to the motor to collect motor information and generate electrical control commands. The optical communication module is connected to the drive module via optical fiber and is also connected to the control unit. The optical communication module is used for bidirectional signal transmission based on photoelectric conversion, converting and transmitting optical feedback signals to the control unit and converting and transmitting electrical control commands to the drive module.

2. The optical communication servo control system according to claim 1, characterized in that, The optical communication module has multiple control interfaces to connect to multiple control units, and the optical communication module has multiple drive interfaces to connect to multiple drive modules.

3. The optical communication servo control system according to claim 2, characterized in that, The optical communication module has six control interfaces and six drive interfaces.

4. The optical communication servo control system according to claim 1, characterized in that, The control unit is connected to the optical communication module via a SCSI-36 cable.

5. The optical communication servo control system according to claim 1, characterized in that, The optical communication module includes multiple photoelectric converters, each photoelectric converter including a first signal conversion unit and a second signal conversion unit; the first signal conversion unit is used to convert electrical control commands into optical command signals that are transmitted to the drive module, and the second signal conversion unit is used to convert optical feedback signals output by the drive module into electrical feedback signals that are transmitted to the control unit.

6. The optical communication servo control system according to claim 5, characterized in that, The first signal conversion unit includes a first differential-to-single-ended module, a first single-ended-to-differential module, and an optical emission module connected in sequence. The first differential-to-single-ended module is used to convert electrical control commands into a first single-ended signal. The first single-ended-to-differential module is used to convert the first single-ended signal into a first low-voltage differential signal. The optical emission module is used to convert the first low-voltage differential signal into an optical command signal for output.

7. The optical communication servo control system according to claim 5, characterized in that, The second signal conversion unit includes a second single-ended to differential module, a second differential to single-ended module, and an optical receiving module connected in sequence. The optical receiving module is used to convert the optical feedback signal into a second low-voltage differential signal. The second differential to single-ended module is used to convert the second low-voltage differential signal into a second single-ended signal. The second single-ended to differential module is used to convert the second single-ended signal into an electrical feedback signal.

8. The optical communication servo control system according to claim 6, characterized in that, The photoelectric converter also includes an interference detection unit. The first differential-to-single-ended module is also used to convert electrical control commands into a third single-ended signal. The interference detection unit is connected to the first differential-to-single-ended module to perform signal processing based on the first single-ended signal and the third single-ended signal to generate a state characterization signal.

9. The optical communication servo control system according to claim 8, characterized in that, The interference detection unit includes an XOR gate, the first input terminal and the second input terminal of the XOR gate receive a first single-ended signal and a third single-ended signal respectively, and the output terminal of the XOR gate outputs a state characterization signal.

10. The optical communication servo control system according to claim 9, characterized in that, The interference detection unit also includes a timer and a diode. The input of the timer is connected to the output of an XOR gate to receive a state characterization signal. The cathode of the diode is connected to the output of the timer, and the anode of the diode is connected to the power supply voltage.

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