A CAN bus-based electric drum control device

Abstract

This invention provides a CAN bus-based electric roller control device, belonging to the field of logistics conveying technology. It includes a main control module, a CAN communication module, an electric roller interface module, and a sensor interface module. The CAN communication module connects to a host computer via a CAN bus. The main control module has a main control chip U5A, which is connected to the CAN communication module. Multiple electric roller interface modules are included; the input of each module is connected to the main control chip U5A, and its output is connected to the drive motor of the electric roller. Multiple sensor interface modules are also included; the output of each module is connected to the main control chip U5A, and its input is connected to a sensor. These sensors feed back signals collected by the sensors to the main control chip U5A, thereby controlling the rotation of the electric roller through the electric roller interface modules. This invention provides a high degree of automation and intelligence in its electric roller control device, enabling the control of multiple electric rollers and avoiding interference from strong / weak current coupling between the drive and control circuits.

Description

Technical Field

[0001] This utility model relates to the field of logistics and conveying technology, and in particular to an electric roller control device based on CAN bus. Background Technology

[0002] A logistics roller conveyor line is a mechanized system that uses a motor to drive rollers to rotate and transmit power through friction to achieve continuous transport of goods. It is a core piece of equipment in modern warehousing. With the rapid development of modern logistics, the requirements for automation and intelligence in logistics conveying equipment are also increasing.

[0003] Currently, the electric roller conveyor lines in logistics mainly use IO control or PROFINET, EtherNet / IP, EtherCat, Modbus for control and communication. The drive motor is externally driven, and both the motor drive circuit and the control circuit are on an external controller. In special scenarios, interference may occur, causing unstable operation. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model discloses an electric roller control device based on CAN bus.

[0005] An electric roller control device based on a CAN bus includes a main control module, a CAN communication module, an electric roller interface module, and a sensor interface module. The CAN communication module is connected to a host computer via a CAN bus. The main control module has a main control chip U5A, which is connected to the CAN communication module. Multiple electric roller interface modules are included, each with its input terminal connected to the main control chip U5A and its output terminal connected to the drive motor of the electric roller. Each interface module includes an electric roller speed control interface circuit and an electric roller direction control interface circuit. Multiple sensor interface modules are also included, each with its output terminal connected to the main control chip U5A and its input terminal connected to a sensor. These sensors feed back signals collected by the sensors to the main control chip U5A, thereby controlling the rotation of the electric roller through the electric roller interface modules.

[0006] Furthermore, the electric roller control device of this application also includes multiple protection modules, the output terminal of each protection module is connected to the main control chip U5A, including a control voltage sampling protection circuit, a bus voltage sampling protection circuit and a PCB temperature sampling protection circuit.

[0007] Furthermore, the electric roller control device of this application also includes multiple alarm modules, each of which is communicatively connected to the main control module and is used to feed back the electric roller alarm signal to the main control module.

[0008] Furthermore, the electric roller control device of this application also includes an IP address editing module. The output end of the IP address editing module is connected to the main control module and is used to configure an IP address for the electric roller control device, thereby realizing the integration of CAN devices and Ethernet.

[0009] Furthermore, the CAN communication module includes a transceiver chip U18. The RXD pin of the transceiver chip U18 is connected to the CAN_RX pin of the main control chip U5A via resistor R98, and the TXD pin of the transceiver chip U18 is connected to the CAN_TX pin of the main control chip U5A via resistor R99. The CANH pin of the transceiver chip U18 is connected to the CANH interface via pins 1 and 2 of the common-mode inductor L3, and the CANL pin of the transceiver chip U18 is connected to the common-mode inductor L3 via pins 1 and 2 of the common-mode inductor L3. Pins 4 and 3 are connected to the CANL interface, which is used to connect to the CAN bus. Pin 2 of the common mode inductor L3 is grounded via TVS diode Z2, pin 3 of the common mode inductor L3 is grounded via TVS diode Z1, pin 1 of the common mode inductor L3 is grounded via resistor R101 and capacitor C66, pin 4 of the common mode inductor L3 is grounded via resistor R100 and capacitor C66, and capacitor C59 is connected in parallel between pin 1 and pin 4 of the common mode inductor L3.

[0010] Furthermore, one end of the input terminal of the electric roller speed control interface circuit is connected to the DSP_AO1 pin of the main control chip U5A, and the other end is simultaneously connected to one end of resistor R79 and resistor R132. The other end of resistor R79 is grounded, and the other end of resistor R132 is connected to the non-inverting input pin 3 of operational amplifier U15A. The +24V power supply is simultaneously connected to pin 8 of operational amplifier U15A and capacitor C50, with the other end of capacitor C50 grounded. The inverting input pin 2 of operational amplifier U15A is simultaneously connected to one end of resistor R142 and resistor R144. The other end of 2 is grounded, and the other end of the resistor R144 is connected to pin 1 of the output of the operational amplifier U15A; pin 1 of the output of the operational amplifier U15A is connected to both capacitor C51 and pin 5 of the non-inverting input of the operational amplifier U15B via resistor R136, and the other end of capacitor C51 and pin 4 of the operational amplifier U15A are grounded; pin 6 of the inverting input of the operational amplifier U15B is connected to pin 7 of the output of the operational amplifier U15B, and pin 7 of the output of the operational amplifier U15B is connected to the output of the electric roller speed control interface circuit via resistor R139.

[0011] Furthermore, the output terminal of the electric roller speed control interface circuit is simultaneously connected to a Zener diode D15 and a capacitor C52, and the other end of the Zener diode D15 and the capacitor C52 is grounded.

[0012] Furthermore, one end of the input terminal of the electric roller direction control interface circuit is connected to the DSP_DO1 pin of the main control chip U5A, and the other end is connected to one end of resistor R81 and the base of NPN transistor Q9 via resistor R77. The other end of resistor R81 and the emitter of NPN transistor Q9 are grounded. The collector of NPN transistor Q9 is connected to one end of resistor R74 and pin 2 of optocoupler U12 via resistor R75. The +5V power supply is connected to the other end of resistor R74 and pin 1 of optocoupler U12. A 24V resistor is connected to the anode of diode D2 via resistor R60. The cathode of diode D2 is simultaneously connected to pin 4 of optocoupler U12, the collector of NPN transistor Q8, the cathode of diode D3, and one end of resistor R71. The other end of resistor R71 is connected to the output terminal of the electric drum direction control interface circuit. The anode of diode D3 and the emitter of NPN transistor Q8 are grounded. Pin 3 of optocoupler U12 is simultaneously connected to the base of NPN transistor Q8 and one end of resistor R78. The other end of resistor R78 is grounded.

[0013] Furthermore, one end of the input terminal of the alarm module is connected to an external alarm triggering device, and the other end is simultaneously connected to one end of resistors R52 and R68. The other end of resistor R52 is grounded. The other end of resistor R68 is simultaneously connected to one end of resistor R61 and pin 1 of optocoupler U9. The other end of resistor R61 is simultaneously connected to one end of resistor R49 and pin 2 of optocoupler U9. The other end of resistor R49 is connected to D11. The 3.3V power supply is connected to pin 4 of optocoupler U9 and the output terminal of the alarm module via resistor R43. The output terminal of the alarm module is connected to the DSP_DI1 pin of the main control chip U5A. Pin 3 of optocoupler U9 is grounded.

[0014] Furthermore, in the PCB temperature sampling protection circuit, one end of resistor R87 is connected to the power supply +3.3V, and the other end is connected to the thermistor RT1. The other end of the thermistor RT1 is grounded, and the temperature sampling point TEMP is located between resistor R87 and the thermistor RT1. A capacitor C55 is connected in parallel across the two ends of the thermistor RT1.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The electric roller control device of this utility model enables the main control module and the host computer to communicate via the CAN bus through the setting of the CAN communication module. New devices only need to be connected to the CAN bus, which has strong expansion capability and high stability of CAN communication. In addition, the electric roller control device of this utility model has a high degree of integration, with multiple electric roller interface modules and sensor modules, which can realize the simultaneous control of multiple electric rollers, reduce the complexity of external wiring, and have a high degree of automation and intelligence. Through the setting of the interface circuit, the strong / weak current coupling interference field of the drive line and the control line can be effectively reduced. Attached Figure Description

[0016] Figure 1 The diagram shows a structural block diagram of an electric roller control device based on a CAN bus according to this utility model. Figure 2 It shows Figure 1 The circuit structure diagram of the main control module is shown below; Figure 3 It shows Figure 1 The circuit structure diagram of the CAN communication module is shown below. Figure 4 yes Figure 1 The circuit structure diagram of the electric drum speed control interface circuit is shown below. Figure 5 yes Figure 1 The circuit structure diagram of the electric drum direction control interface circuit is shown below. Figure 6 yes Figure 1 The circuit structure diagram of the alarm module is shown below; Figure 7 yes Figure 1 The circuit structure diagram of the PCB temperature sampling protection circuit is shown below. Figure 8 yes Figure 1 The circuit structure diagram of the bus voltage sampling protection circuit is shown below. Figure 9 yes Figure 1 The circuit structure diagram of the control voltage sampling protection circuit is shown.

[0017] In the picture: 1-Main control module; 2-CAN communication module; 3-Electric roller interface module; 31-Electric roller speed control interface circuit; 32-Electric roller direction control interface circuit; 4-Sensor interface module; 5-Protection module; 6-Alarm module; 7-IP address editing module; 8-Power supply module. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] Combination Figure 1 As shown, this application discloses a CAN bus-based electric roller control device, comprising a main control module 1, a CAN communication module 2, an electric roller interface module 3, a sensor interface module 4, a protection module 5, an alarm module 6, an IP address editing module 7, and a power supply module 8. The main control module 1 includes a main control chip U5A, such as... Figure 2As shown, the main control chip U5A, model F280041CPZS, is used for real-time processing of control algorithms. CAN communication module 2 acts as a communication bridge between the host computer and the main control module 1, communicating with the host computer via the CAN bus to implement command delivery and data upload. There are two electric roller interface modules 3, capable of connecting two electric rollers and communicating with the main control module 1. These include an electric roller speed control interface circuit 31 and an electric roller direction control interface circuit 32. The electric roller speed control interface circuit 31 adjusts the operating speed of the electric roller according to the commands from the main control module 1, while the electric roller direction control interface circuit 32 changes the rotation direction (forward or reverse) of the electric roller according to the commands from the main control module 1. The output of sensor interface module 4 is connected to the main control module 1, and the input is connected to the sensor, used to feed back various status data (such as position, pressure, etc.) collected by the sensor to the main control module 1. Protection module 5 includes a control voltage sampling protection circuit 51, a bus voltage sampling protection circuit 52, and a PCB temperature sampling protection circuit 53. The control voltage sampling protection circuit 51 monitors the control circuit voltage and, in case of abnormality, triggers protection in conjunction with the main control module 1 to prevent voltage-related damage to the equipment. The bus voltage sampling protection circuit 52 monitors the main power supply bus voltage and, in case of abnormality, triggers protection in conjunction with the main control module 1 to ensure the safety of the system's power supply. The PCB temperature sampling protection circuit 53 monitors the PCB circuit board temperature and, in case of overheating, triggers protection in conjunction with the main control module 1 to prevent overheating damage. Alarm module 6 has its input terminal connected to the signal interface of an external alarm triggering device and its output terminal connected to the main control module 1, used to feed back the electric roller alarm signal to the main control module 1. IP address editing module 7 is communicatively connected to the main control module 1 and is used to configure the IP address for the electric roller control device, realizing the integration of CAN devices and Ethernet. Power module 8 is electrically connected to the above modules and is used to supply power to the above modules.

[0022] In summary, the main control module 1 of this utility model receives various input signals, processes them, and outputs control commands. At the same time, it has a linkage protection mechanism to ensure the stable and safe operation of the electric roller. Each module has a clear division of labor and works together to support the realization of the functions of the electric roller system.

[0023] Specifically, in combination Figure 3As shown, the CAN communication module 2 includes a transceiver chip U18, model CA-IS2062A, used for signal conversion and communication between the main control module 1 and the CAN bus. The RXD pin of transceiver chip U18 is connected to the CAN_RX pin of the main control chip U5A via resistor R98, used to receive control signals sent by the main control chip U5A. The TXD pin of transceiver chip U18 is connected to the CAN_TX pin of the main control chip via resistor R99, used to transmit data received from the CAN bus back to the main control chip U5A. The CANH pin of transceiver chip U18 is connected to the CANH interface via pins 1 and 2 of common-mode inductor L3, and the CANL pin of transceiver chip U18 is connected to the CANL interface via pins 4 and 3 of common-mode inductor L3. The CANH and CANL interfaces are used to connect to the CAN bus and output or receive differential signals. Pin 2 of common-mode inductor L3 is grounded via TVS diode Z2, pin 3 is grounded via TVS diode Z1, pin 1 is grounded via resistor R101 and capacitor C66, and pin 4 is grounded via resistor R100 and capacitor C66. A capacitor C59 is connected in parallel between pins 1 and 4 of common-mode inductor L3. Common-mode inductor L3 is used to suppress common-mode noise on the CAN bus, improving communication anti-interference capability. TVS diodes Z1 and Z2 provide surge protection; when the CAN bus encounters lightning strikes or transient high voltage, TVS diodes Z1 and Z2 conduct and clamp, protecting the transceiver chip U18 from overvoltage damage. Resistors R100 and R101, along with capacitor C66, form an RC filter to further filter out CAN bus noise.

[0024] The working principle of the CAN communication module 2 of this utility model is as follows: When sending data, the main control chip U5A sends a logic level signal to the CAN_TX pin, which enters the TXD pin of the transceiver chip U18 through resistor R99. The transceiver chip U18 converts the logic level signal into a differential signal, which is then processed by common mode inductor L3, TVS diodes Z1 and Z2 and RC filter before being sent to the CAN bus.

[0025] When receiving data, the differential signal of the CAN bus is processed by common-mode inductor L3, TVS diodes Z1 and Z2 and RC filter, and then enters the CANH and CANL pins of transceiver chip U18. After the transceiver chip converts the differential signal into a logic level signal, it is output to the CAN_RX pin of the main control chip through resistor R98 and received by the main control chip U5A.

[0026] In summary, this application uses transceiver chip U18 to convert the logic level of master control chip U5A to the differential signal of CAN bus, and uses common mode inductor L3, TVS diodes Z1 and Z2 and RC filter to comprehensively reduce interference and ensure the stability of CAN communication.

[0027] Furthermore, this embodiment takes one of the electric roller control interface modules 3 as an example to introduce the electric roller speed control interface circuit 31 and the electric roller direction control interface circuit 32. Specifically, in conjunction with... Figure 4 As shown, one end of the input terminal of the electric roller speed control interface circuit 31 is connected to the DSP_AO1 pin of the main control chip U5A, and the other end is connected to one end of resistor R79 and resistor R132. The other end of resistor R79 is grounded, and the other end of resistor R132 is connected to the non-inverting input pin 3 of operational amplifier U15A. The +24V power supply is connected to pin 8 of operational amplifier U15A and capacitor C50, and the other end of capacitor C50 is grounded. The inverting input pin 2 of operational amplifier U15A is connected to one end of resistor R142 and resistor R144. The other end of resistor R142 is grounded, and the other end of resistor R144 is connected to pin 1 of the output of operational amplifier U15A. Pin 1 of the output of operational amplifier U15A is connected to capacitor C51 and pin 5 (non-inverting input) of operational amplifier U15B via resistor R136. The other end of capacitor C51 and pin 4 of operational amplifier U15A are grounded. Pin 6 (inverting input) of operational amplifier U15B is connected to pin 7 of the output of operational amplifier U15B. Pin 7 of the output of operational amplifier U15B is connected to the output of the electric roller speed control interface circuit via resistor R139. The output of the electric roller speed control interface circuit is also connected to Zener diode D15 and capacitor C52. The other ends of Zener diode D15 and capacitor C52 are grounded.

[0028] The working principle of the electric drum speed control interface circuit in this application is as follows: The main control chip U15A outputs a corresponding analog voltage signal through the DSP_A01 pin based on the target speed of the electric roller. This signal is grounded and divided by resistor R79 before entering the non-inverting input pin 3 of operational amplifier U15A. After being amplified by operational amplifier U15A, it is output from pin 1 of operational amplifier U15A and then enters operational amplifier U15B through resistor R136. Operational amplifier U15B forms a voltage follower, which can both isolate the preceding and following circuits and drive the following load. After the signal is output from pin 7 of operational amplifier U15B, it flows to the output of the electric roller speed control circuit. When the output signal voltage exceeds 12V, the Zener diode D15 conducts, clamping the voltage at 13.1V. In summary, the electric roller speed control interface circuit of this invention, after amplification, filtering, and overvoltage protection, outputs a stable voltage signal with a suitable amplitude. This signal is used to change the rotational speed of the electric roller, achieving precise control of the electric roller speed.

[0029] Furthermore, combined with Figure 5 As shown, one end of the input terminal of the electric drum direction control interface circuit of this utility model is connected to the DSP_DO1 pin of the main control chip U5A, and the other end is connected to one end of resistor R81 and the base of NPN transistor Q9 through resistor R77. The other end of resistor R81 and the emitter of NPN transistor Q9 are grounded. The collector of NPN transistor Q9 is connected to one end of resistor R74 and pin 2 of optocoupler U12 through resistor R75. The +5V power supply is connected to the other end of resistor R74 and pin 1 of optocoupler U12; the +24V power supply is connected to the anode of diode D2 through resistor R60. The cathode of diode D2 is simultaneously connected to pin 4 of optocoupler U12, the collector of NPN transistor Q8, the cathode of diode D3, and one end of resistor R71. The other end of resistor R71 is connected to the output of the electric drum direction control interface circuit. The anode of diode D3 and the emitter of NPN transistor Q8 are grounded. Pin 3 of optocoupler U12 is simultaneously connected to the base of NPN transistor Q8 and one end of resistor R78. The other end of resistor R78 is grounded.

[0030] The working principle of the electric drum direction control interface circuit of this utility model is as follows: Forward Rotation Control: When the DSP_DO1 pin of the main control chip U5A outputs a high level, current flows through resistor R77 to the base of NPN transistor Q9, turning on the NPN transistor Q9. After being turned on, the NPN transistor Q9 pulls its collector low to near ground. At this time, the current path is: +5V power supply → pin 1 of optocoupler U12 → pin 2 of optocoupler U12 → resistor R75 → collector of NPN transistor Q9 → emitter of NPN transistor Q9 → GND. This current causes the LED inside optocoupler U12 to light up, triggering the phototransistor inside to conduct. After the phototransistor conducts, a circuit is formed between pins 3 and 4 of optocoupler U12. At this time, the current path is: +24V power supply → resistor R60 → ​​diode D2 → pin 4 of optocoupler U12 → pin 3 of optocoupler U12 → resistor R78 → GND. The current flows through resistor R78 and generates a voltage drop across it. Simultaneously, this current flows to the base of NPN transistor Q8, turning it on and creating a low-resistance path between its collector and emitter. At this time, the potential of output terminal DO1 is pulled low by Q8 to near ground level (GND), and this low-level signal drives the external actuator to rotate forward.

[0031] Reversal Control: When the DSP_DO1 pin of the main control chip U5A outputs a low level, the NPN transistor Q9 is cut off, and no current flows through the LED inside the optocoupler U12, so it does not emit light. The phototransistor inside the optocoupler U12 is also cut off, and its output pins 3 and 4 are disconnected. Since there is no output current at pin 3 of the optocoupler U12, there is no driving current at the base of the NPN transistor Q8, so Q8 is cut off, and its collector-emitter junction is in a high-impedance state, no longer pulling the output DO1 low. At this time, the current path is: +24V power supply through resistor R60 → ​​diode D2 → resistor R71 → output DO1, forming a circuit. The potential of output DO1 is raised to close to +24V, and this high-level signal drives the external actuator to reverse.

[0032] Furthermore, this embodiment takes one of the alarm modules 6 as an example to illustrate the circuit structure of the alarm module 6 in detail. Specifically, in conjunction with... Figure 6As shown, one end of the input terminal of alarm module 6 is connected to an external alarm triggering device, and the other end is connected to one end of resistors R52 and R68. The other end of resistor R52 is grounded. The other end of resistor R68 is connected to one end of resistor R61 and pin 1 of optocoupler U9. The other end of resistor R61 is connected to one end of resistor R49 and pin 2 of optocoupler U9. The other end of resistor R49 is connected to D11. The 3.3V power supply is connected to pin 4 of optocoupler U9 and the output terminal of the alarm module via resistor R43. The output terminal of the alarm module is connected to the DSP_DI1 pin of the main control chip U5A. Pin 3 of optocoupler U9 is grounded. This utility model alarm module is an alarm circuit based on optocoupler U9, including an input side circuit and an output side circuit. The input side circuit includes resistors R68, R61, and R49. The voltage at CMO is divided by these resistors, limiting the current flowing into pin 1 of optocoupler U9 to prevent damage to the LED of optocoupler due to excessive current. The optocoupler U9 disconnects the electrical connection between the external alarm trigger circuit and the control module, and transmits the alarm using optical signals, which has strong anti-interference capabilities.

[0033] The working principle of the alarm module of this utility model is as follows: When there is no alarm signal, CMO3 has no level change, the LED in optocoupler U9 has no current, the phototransistor is cut off, and the 3.3V voltage is output after passing through resistor R43. Since the phototransistor is cut off, the current cannot be grounded through the phototransistor, and the output terminal remains at a high level.

[0034] When an alarm signal is received, the level of CMO3 changes. After being divided by R68 and R61, current flows through the input side (pins 1 and 2) of the optocoupler, causing the internal LED to light up. The light signal triggers the phototransistor on the output side (pins 3 and 4) of the optocoupler to conduct, forming a new current path. At this time, the 3.3V voltage is connected to pin 4 of the optocoupler through resistor R43, and then connected to ground through pin 3. The output is at a low level. The main control chip U5A detects the level change at the output to identify the alarm signal of the electric drum and triggers subsequent alarm processing (such as shutdown, audible and visual alarms, etc.).

[0035] In summary, the alarm circuit of this invention achieves reliable connection and electrical isolation between the external alarm signal and the internal control circuit of the electric roller through optocoupler isolation technology. When the electric roller malfunctions and triggers an alarm signal, it can accurately and stably transmit the alarm information to the control module, enabling timely implementation of appropriate measures to ensure the safe operation of the electric roller system.

[0036] Furthermore, combined with Figure 7As shown, this utility model's PCB temperature sampling and protection circuit utilizes the characteristic of NTC thermistors changing resistance with temperature to achieve real-time sampling of PCB temperature and provide temperature protection for the hardware. Specifically, the +3.3V power supply is grounded through resistor R87 and thermistor RT1. Resistor R87 and thermistor RT1 are connected in series to form a voltage divider circuit, and the temperature sampling point TEMP is located between resistor R87 and thermistor RT1. According to the voltage divider principle, the voltage value obtained at TEMP will change with the resistance of thermistor RT1. The voltage signal at TEMP is transmitted to the main control chip U5A, and the corresponding PCB temperature value can be obtained by processing this voltage value. When the PCB temperature is detected to reach or exceed the set protection point (e.g., 80℃), corresponding protection actions will be triggered, such as issuing an alarm signal or reducing the system operating frequency, to prevent PCB damage due to overheating and ensure stable system operation. A capacitor C55 is connected in parallel across the two ends of the thermistor RT1. The capacitor C55 is a filter capacitor used to filter out high-frequency noise in the voltage value at the TEMP point, making the acquired voltage value more stable.

[0037] Combination Figure 8 As shown, this utility model's bus voltage sampling and protection circuit is a bus voltage sampling circuit based on resistor voltage divider. It can convert a high bus voltage into a low-voltage signal suitable for acquisition and processing, while also possessing certain filtering and clamping protection functions. Specifically, the bus input voltage 24 / 48V_IN is connected in series with resistors R94, R95, and R97. The other end of resistor R97 is grounded, and the voltage of resistor R97 is connected to the VDC sampling point via resistor R96. Resistor R96 plays a certain role in current limiting and isolation, preventing the downstream circuit of the sampling point from affecting the voltage divider network, and ensuring the stability and accuracy of the sampling signal. The voltage signal of the VDC sampling point is transmitted to the main control chip U5A. By processing the voltage value of the VDC sampling point, the corresponding bus input voltage value can be obtained. In addition, capacitor C58 is connected in parallel between the VDC sampling point and ground to form a filter circuit, making the sampled voltage signal more stable and improving the stability of voltage sampling. One end of diode D14 is connected to the VDC sampling point, and the other end is connected to the +3.3V power supply, which plays a clamping protection role. When the voltage at the VDC sampling point exceeds +3.3V due to abnormal conditions, diode D14 conducts, clamping the voltage at the VDC sampling point to around 3.4V. This prevents excessively high voltage from entering the main control chip U5A, avoids damage to sensitive components due to overvoltage, and ensures the reliability and stability of the circuit.

[0038] Furthermore, combined with Figure 9As shown, the control voltage sampling protection circuit of this utility model includes a voltage divider network composed of resistors R86, R88, and R90. A +24V control voltage is applied to the input terminal of resistor R86, and the output terminal of resistor R90 is grounded. According to the voltage divider principle of series circuits, a smaller voltage value proportional to the control voltage is obtained across R90. The voltage of resistor R90 is connected to the VCC_24L sampling point via resistor R89. R89 provides current limiting and isolation, preventing the downstream circuit of the sampling point from affecting the voltage divider network and ensuring the stability and accuracy of the sampling signal. The voltage signal at the VCC_24L point is acquired and processed by the main control module to obtain the corresponding +24V control voltage value. Capacitor C56 is connected in parallel between the VCC_24L sampling point and ground, forming a filter circuit. One end of diode D13 is connected to the VCC_24L sampling point, and the other end is connected to the +3.3V power supply, providing clamping protection. When the voltage at the VCC_24L sampling point exceeds +3.3V due to an abnormal condition, diode D13 conducts, clamping the voltage at the VCC_24L sampling point to approximately 3.4V. This prevents excessively high voltages from entering subsequent circuits, avoiding damage to sensitive components due to excessive voltage, and ensuring the reliability and stability of the circuit.

[0039] It should be emphasized that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A CAN bus-based electric drum control device, characterized by, The system includes a main control module (1), a CAN communication module (2), an electric roller interface module (3), and a sensor interface module (4). The CAN communication module (2) is connected to the host computer via a CAN bus. The main control module (1) has a main control chip U5A, which is connected to the CAN communication module (2). There are multiple electric roller interface modules (3). The input end of each electric roller interface module (3) is connected to the main control chip U5A, and the output end is connected to the drive motor of the electric roller. It includes an electric roller speed control interface circuit (31) and an electric roller direction control interface circuit (32). There are multiple sensor interface modules (4). The output end of each sensor interface module (4) is connected to the main control chip U5A, and the input end is connected to the sensor. It is used to feed back the signals collected by the sensor to the main control chip U5A, and then control the rotation of the electric roller through the electric roller interface module (3).

2. The motorized roller control device of claim 1, wherein, It also includes multiple protection modules (5), the output of each of the protection modules (5) is connected to the main control chip U5A, including a control voltage sampling protection circuit, a bus voltage sampling protection circuit and a PCB temperature sampling protection circuit.

3. The motorized roller control device of claim 1, wherein, It also includes multiple alarm modules (6), each of which is communicatively connected to the main control module and is used to feed back the electric drum alarm signal to the main control module.

4. The motorized roller control device of claim 1, wherein, It also includes an IP address editing module (7), the output of which is connected to the main control module (1) and is used to configure the IP address of the electric roller control device to realize the integration of CAN device and Ethernet.

5. The motorized roller control device of claim 1, wherein, The CAN communication module (2) includes a transceiver chip U18. The RXD pin of the transceiver chip U18 is connected to the CAN_RX pin of the main control chip U5A via resistor R98, and the TXD pin of the transceiver chip U18 is connected to the CAN_TX pin of the main control chip U5A via resistor R99. The CANH pin of the transceiver chip U18 is connected to the CANH interface via pins 1 and 2 of the common mode inductor L3, and the CANL pin of the transceiver chip U18 is connected to pins 4 and 5 of the common mode inductor L3. Pins 1 and 3 are connected to the CANL interface, which is used to connect to the CAN bus. Pin 2 of the common mode inductor L3 is grounded through TVS diode Z2, pin 3 of the common mode inductor L3 is grounded through TVS diode Z1, pin 1 of the common mode inductor L3 is grounded through resistor R101 and capacitor C66, pin 4 of the common mode inductor L3 is grounded through resistor R100 and capacitor C66, and capacitor C59 is connected in parallel between pin 1 and pin 4 of the common mode inductor L3.

6. The electric drum control device according to claim 1, characterized in that, One end of the input terminal of the electric roller speed control interface circuit is connected to the DSP_AO1 pin of the main control chip U5A, and the other end is connected to one end of resistor R79 and resistor R132. The other end of resistor R79 is grounded, and the other end of resistor R132 is connected to the non-inverting input pin 3 of operational amplifier U15A. The +24V power supply is connected to pin 8 of operational amplifier U15A and capacitor C50, with the other end of capacitor C50 grounded. The inverting input pin 2 of operational amplifier U15A is connected to one end of resistor R142 and resistor R144. The other end is grounded, and the other end of the resistor R144 is connected to pin 1 of the output of the operational amplifier U15A; pin 1 of the output of the operational amplifier U15A is connected to both capacitor C51 and pin 5 of the non-inverting input of the operational amplifier U15B via resistor R136, and the other end of capacitor C51 and pin 4 of the operational amplifier U15A are grounded; pin 6 of the inverting input of the operational amplifier U15B is connected to pin 7 of the output of the operational amplifier U15B, and pin 7 of the output of the operational amplifier U15B is connected to the output of the electric roller speed control interface circuit via resistor R139.

7. The electric drum control device according to claim 6, characterized in that, The output terminal of the electric drum speed control interface circuit is simultaneously connected to a Zener diode D15 and a capacitor C52, and the other end of the Zener diode D15 and the capacitor C52 is grounded.

8. The electric drum control device according to claim 1, characterized in that, One end of the input terminal of the electric roller direction control interface circuit is connected to the DSP_DO1 pin of the main control chip U5A. The other end is connected via resistor R77 to one end of resistor R81 and the base of NPN transistor Q9. The other end of resistor R81 and the emitter of NPN transistor Q9 are grounded. The collector of NPN transistor Q9 is connected via resistor R75 to one end of resistor R74 and pin 2 of optocoupler U12. The +5V power supply is connected to the other end of resistor R74 and pin 1 of optocoupler U12. The +24V power supply... V is connected to the anode of diode D2 via resistor R60. The cathode of diode D2 is simultaneously connected to pin 4 of optocoupler U12, the collector of NPN transistor Q8, the cathode of diode D3, and one end of resistor R71. The other end of resistor R71 is connected to the output terminal of the electric drum direction control interface circuit. The anode of diode D3 and the emitter of NPN transistor Q8 are grounded. Pin 3 of optocoupler U12 is simultaneously connected to the base of NPN transistor Q8 and one end of resistor R78. The other end of resistor R78 is grounded.

9. The electric drum control device according to claim 3, characterized in that, One end of the input terminal of the alarm module is connected to an external alarm triggering device, and the other end is connected to one end of resistor R52 and resistor R68. The other end of resistor R52 is grounded. The other end of resistor R68 is connected to one end of resistor R61 and pin 1 of optocoupler U9. The other end of resistor R61 is connected to one end of resistor R49 and pin 2 of optocoupler U9. The other end of resistor R49 is connected to D11. A 3.3V power supply is connected via resistor R43 to pin 4 of the optocoupler U9 and the output of the alarm module. The output of the alarm module is connected to the DSP_DI1 pin of the main control chip U5A. Pin 3 of the optocoupler U9 is grounded.

10. The electric drum control device according to claim 2, characterized in that, In the PCB temperature sampling protection circuit, one end of resistor R87 is connected to the power supply +3.3V, and the other end is connected to the thermistor RT1. The other end of the thermistor RT1 is grounded. The temperature sampling point TEMP is located between resistor R87 and the thermistor RT1. A capacitor C55 is connected in parallel across the two ends of the thermistor RT1.

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