Peristaltic pump flow monitoring circuit and peristaltic pump system

Abstract

The application relates to the technical field of fluid transmission devices, and discloses a peristaltic pump flow monitoring circuit and a peristaltic pump system, wherein the circuit comprises a flowmeter module, a control module and a plurality of peristaltic pump driving modules, each peristaltic pump driving module corresponding to driving one peristaltic pump; the flowmeter module is connected with the control module to detect the liquid flow rate through the peristaltic pump in real time and generate a flow detection signal to feed back to the control module; the control module is configured to generate a control signal according to the flow detection signal; the input control end of the peristaltic pump driving module is connected with the control module, and the output detection end of the peristaltic pump driving module is connected with the control module to output a load detection signal of the peristaltic pump, so that the control module adjusts the control signal according to the load detection signal. The application realizes peristaltic pump system flow self-adaptive control and multi-pump precise collaborative control, effectively improves the flow precision error caused by pump pipe deformation or skidding, and is beneficial to realizing curve tracking on complex flow.

Description

Technical Field

[0001] This application relates to the field of fluid transfer equipment technology, and in particular to a peristaltic pump flow monitoring circuit and a peristaltic pump system. Background Technology

[0002] In the field of liquid detection and transportation in animal husbandry, peristaltic pumps are widely used. As a high-precision fluid transfer device, they feature pollution-free transmission and good sealing performance.

[0003] However, when controlling peristaltic pumps, the relevant technologies typically rely on fixed formulas to calculate parameters for calibration, which is easily affected by the environment and fluid medium, resulting in poor control accuracy. Furthermore, in applications requiring multiple peristaltic pumps to work together, each pump is equipped with an independent controller, making it difficult to achieve precise multi-pump coordinated control. Utility Model Content

[0004] This application provides a peristaltic pump flow monitoring circuit and a peristaltic pump system, which solves the technical problems of poor flow control accuracy and low intelligence level of peristaltic pump systems. This application realizes adaptive flow control and precise collaborative control of multiple pumps in the peristaltic pump system, effectively improves the flow accuracy error caused by pump tube deformation or slippage, and is conducive to curve tracking of complex flow.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include: In a first aspect, embodiments of this application provide a peristaltic pump flow monitoring circuit, the circuit including a flow meter module, a control module and a plurality of peristaltic pump drive modules, each of the peristaltic pump drive modules driving one peristaltic pump; The flow meter module is connected to the control module to detect the flow rate of the liquid flowing through the peristaltic pump in real time and generate a flow detection signal to be fed back to the control module. The control module is configured to generate a control signal based on the flow detection signal; The input control terminal of each of the peristaltic pump drive modules is connected to the control module to receive the control signal and drive the cooperative operation of each peristaltic pump according to the control signal; Each of the peristaltic pump drive modules has its output detection terminal connected to the control module to output the load detection signal of the peristaltic pump and send the load detection signal to the control module, so that the control module adjusts the control signal according to the load detection signal.

[0006] The peristaltic pump flow monitoring circuit proposed in this application can detect the flow rate in real time through a flow meter module. This allows the control module to dynamically control the peristaltic pump drive module to adjust the rotation state of the peristaltic pump based on the actual flow rate. Simultaneously, it receives load detection signals from the peristaltic pump drive module to the control module, enabling timely acquisition of the actual load status of the peristaltic pump. This avoids uncontrollable changes such as pump tube deformation or slippage affecting the control accuracy of the peristaltic pump, thus achieving closed-loop control of the fluid transfer process. Compared with open-loop control methods that rely on fixed parameter calibration, it can adaptively control changes such as liquid viscosity, pump tube aging, and liquid adhesion to the pump walls, effectively improving the accuracy and stability of flow control. Furthermore, when multiple peristaltic pumps need to work together, the control module can synchronously generate corresponding control signals based on the flow detection signals, achieving coordinated operation among multiple pumps and reducing flow ratio deviations caused by asynchronous responses. Therefore, this application realizes adaptive flow control and precise multi-pump coordinated control of the peristaltic pump system, effectively improving flow accuracy errors caused by pump tube deformation or slippage, and facilitating curve tracking of complex flow rates.

[0007] Optionally, the flow meter module includes: A flow sensor, wherein a first port of the flow sensor is adapted to receive a first power supply signal, a second port of the flow sensor is adapted to output the flow detection signal, and a third port of the flow sensor is grounded; A first transistor, wherein the control terminal of the first transistor is adapted to be connected to the second port of the flow sensor, the first terminal of the first transistor is connected to the control module, and the first terminal of the first transistor is adapted to receive the first power supply signal, and the second terminal of the first transistor is grounded.

[0008] This application can shape and stabilize the output signal of the flow sensor, ensuring the consistency of the signal level and anti-interference performance of the signal received by the control module, thereby improving the flow detection accuracy and system reliability. The signal conditioned by this flow meter module can be acquired by the control module in real time, realizing accurate feedback and closed-loop control of the peristaltic pump flow.

[0009] Optionally, the control module includes a microcontroller unit; The first input terminal of the microcontroller unit is connected to the flow meter module to receive the flow detection signal generated by the flow meter module through the first input terminal. The first and second output terminals of the microcontroller unit are connected to the peristaltic pump drive module. The microcontroller unit is configured to generate the control signal through the first and second output terminals and send it to the peristaltic pump drive module.

[0010] The microcontroller unit can acquire and process the signals output by the flow meter module in real time, and use this information to precisely control the start, stop and speed of the peristaltic pump, thereby achieving stable closed-loop regulation.

[0011] Optionally, the peristaltic pump is a stepper motor, and each peristaltic pump drive module includes a motor drive chip. The steering control terminal of the motor drive chip is connected to the first output terminal of the microcontroller unit as one of the input control terminals of the peristaltic pump drive module, and the phase control terminal of the motor drive chip is connected to the second output terminal of the microcontroller unit as another of the input control terminals of the peristaltic pump drive module, so as to receive the control signal through the steering control terminal and the phase control terminal. The first, second, third, and fourth driving terminals of the motor driver chip are connected to the stepper motor to control the direction and phase of the stepper motor.

[0012] This application can precisely control the driving phase sequence and rotation direction of the stepper motor, ensuring that the peristaltic pump operates smoothly and responds quickly, which is beneficial to improving the control accuracy of the peristaltic pump.

[0013] Optionally, the microcontroller unit further includes a second input terminal and a third input terminal, and the motor driver chip further includes a first detection terminal and a second detection terminal. The first detection terminal serves as one output detection terminal of the peristaltic pump drive module and is connected to the second input terminal of the microcontroller unit. The second detection terminal serves as the other output detection terminal of the peristaltic pump drive module and is connected to the third input terminal of the microcontroller unit, so as to detect the load status of the peristaltic pump and generate the load detection signal to be fed back to the control module. The control module is also configured to adjust the control signal according to the load conditions.

[0014] This application can monitor changes in motor load in real time and dynamically adjust the drive output, effectively avoiding overload or idling of the peristaltic pump, and improving the system's adaptability and operational reliability.

[0015] Optionally, the circuit further includes a power conversion module, which includes a step-down chip. The input terminal of the step-down chip is adapted to receive a second power supply signal, so as to step down the second power supply signal to obtain the first power supply signal, and output the first power supply signal through the output terminal of the step-down chip.

[0016] Optionally, the circuit further includes a voltage regulator module, which includes a Zener diode. The cathode of the Zener diode is adapted to be connected to the reset port of the microcontroller power supply, and the cathode of the Zener diode is also adapted to receive a first power supply signal. The control electrode of the Zener diode is connected to the cathode of the Zener diode, and the anode of the Zener diode is grounded.

[0017] Optionally, the circuit further includes a switching module, which includes a push-button switch, a power management chip, and a second transistor. The first terminal of the push-button switch is grounded, the second terminal of the push-button switch is adapted to connect to the input terminal of the power management chip, the output terminal of the power management chip is connected to the control terminal of the second transistor, the first terminal of the second transistor is connected to the second power supply signal, and the second terminal of the second transistor is connected to the control module.

[0018] This application implements one-button start and stop functions through a switch module, and with the help of a power management chip, it can realize soft start and power failure protection, thereby improving system safety and ease of operation.

[0019] Optionally, the circuit further includes a serial port module, which includes a USB interface and a serial port conversion chip. The USB interface is connected to the input terminal of the serial port conversion chip, and the output terminal of the serial port conversion chip is connected to the control module to perform software debugging of the control program of the control module through the USB interface.

[0020] This application facilitates online system debugging and firmware upgrades through a serial port module, simplifies maintenance processes, and improves development and calibration efficiency.

[0021] Secondly, embodiments of this application provide a peristaltic pump system, the system comprising: At least one peristaltic pump; The peristaltic pump flow monitoring circuit is connected to each of the peristaltic pumps. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a peristaltic pump flow monitoring circuit provided in an embodiment of this application; Figure 2 A schematic diagram of the circuit structure of the flow meter module provided in the embodiments of this application; Figure 3 A schematic diagram of the circuit structure of the control module provided in an embodiment of this application; Figure 4 A schematic diagram of the circuit structure of the peristaltic pump drive module provided in an embodiment of this application; Figure 5 A schematic diagram of the circuit structure of the power conversion module provided in the embodiments of this application; Figure 6 One of the circuit structure diagrams of the voltage regulator module provided in the embodiments of this application; Figure 7 A second schematic diagram of the circuit structure of the voltage regulator module provided in the embodiments of this application; Figure 8 A schematic diagram of the circuit structure of the switching module provided in an embodiment of this application; Figure 9 One of the circuit structure diagrams of the serial port module provided in the embodiments of this application; Figure 10 This is the second schematic diagram of the circuit structure of the serial port module provided in the embodiments of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0026] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0027] Currently, most peristaltic pump control systems adopt an open-loop control method, which drives the peristaltic pump motor only according to the set speed or running time. When the pipeline ages, the viscosity of the medium changes, or the pump tube slips, this control method is prone to causing the output flow rate to deviate from the set value, making it difficult to achieve stable and accurate flow control.

[0028] Meanwhile, in related technologies, each peristaltic pump needs to be equipped with an independent control module, which results in poor system scalability and high cost. Furthermore, in application scenarios involving multiple pumps operating in parallel or proportional liquid preparation, dynamic coordination and synchronous control of flow rates between pumps cannot be achieved.

[0029] Therefore, a control system with flow closed-loop feedback control and support for multi-pump collaborative drive is needed to improve flow detection accuracy and system response speed.

[0030] This application provides a peristaltic pump flow monitoring circuit 10, such as... Figure 1 As shown, the circuit includes a flow meter module 11, a control module 12, and multiple peristaltic pump drive modules 13, each driving a peristaltic pump 20. The flow meter module 11 is connected to the control module 12 to detect the flow rate of the liquid passing through the peristaltic pump 20 in real time and generate a flow detection signal, which is fed back to the control module 12. The control module 12 is configured to generate a control signal based on the flow detection signal. The input control terminals of each peristaltic pump drive module 13 are connected to the control module 12 to receive the control signal and drive the coordinated operation of each peristaltic pump 20 according to the control signal. Simultaneously, the output detection terminals of each peristaltic pump drive module 13 are connected to the control module 12 to output a load detection signal of the peristaltic pump 20 and send the load detection signal to the control module 12, enabling the control module 12 to adjust the control signal according to the load detection signal.

[0031] Specifically, when liquid flows through peristaltic pump 20, flow meter module 11 generates a corresponding flow detection signal based on fluid velocity or volume change per unit time, and transmits the flow detection signal to the relevant port of control module 12 to achieve real-time, high-precision acquisition of liquid flow.

[0032] The control module 12 adopts the STM32 series microcontroller system. Its internal integrated analog-to-digital conversion circuit can convert the flow detection signal fed back by the flow meter module 11 into a digital signal, calculate the detected flow value based on the digital signal, compare the detected flow value with the target flow value set by the system, and generate a precise control signal based on the adaptive PID adjustment algorithm.

[0033] Each peristaltic pump drive module 13 receives the control signal output by the control module 12 and generates a corresponding motor drive signal to drive the peristaltic pump 20 in the phase and direction of rotation, thereby achieving precise control of the liquid delivery volume. Simultaneously, multiple peristaltic pump drive modules 13, by receiving control commands from the control module 12, can achieve synchronous and coordinated control of multiple pumps, effectively solving the problems of response delay and poor synchronization of multiple peristaltic pumps 20, and ensuring precise matching of fluid ratios. Furthermore, each peristaltic pump drive module 13 also monitors the load conditions of the corresponding peristaltic pump, such as load conditions caused by abnormal mechanical transmission resistance, liquid viscosity, pump tube aging, and liquid adhesion to the pump wall, resulting in changes in motor operating current. This information is fed back to the control module 12 in real time for adaptive adjustment of the control signal, preventing damage to the pump body and circuitry due to overload.

[0034] The peristaltic pump flow monitoring circuit 10 proposed in this application can detect the flow rate in real time through the flow meter module 11. This allows the control module 12 to dynamically control the peristaltic pump drive module 13 to adjust the rotation state of the peristaltic pump 20 based on the actual flow rate. Simultaneously, it receives the load detection signal fed back from the peristaltic pump drive module 13 to the control module 12, thus timely obtaining the actual load condition of the peristaltic pump 20. This avoids uncontrollable changes such as pump tube deformation or slippage affecting the control accuracy of the peristaltic pump 20, thereby achieving closed-loop control of the fluid transfer process. Compared with open-loop control methods that rely on fixed parameter calibration, it can adaptively control changes such as liquid viscosity, pump tube aging, and liquid adhesion to the pump wall, effectively improving the accuracy and stability of flow control. Furthermore, when multiple peristaltic pumps 20 need to work together, the control module 12 can synchronously generate corresponding control signals based on the flow detection signals, achieving coordinated operation among multiple pumps and reducing flow ratio deviations caused by asynchronous responses. Therefore, this application realizes adaptive flow control and precise collaborative control of multiple pumps in the peristaltic pump system, effectively improving the flow accuracy error caused by pump tube deformation or slippage, and is conducive to curve tracking of complex flow.

[0035] Figure 2 The circuit structure of the flow meter module 11 described above is shown. In some embodiments of this application, such as... Figure 2 As shown, the flow meter module 11 includes a flow sensor P1 and a first transistor Q1.

[0036] The first port of flow sensor P1 is adapted to receive the first power supply signal, the second port of flow sensor P1 is adapted to output the flow detection signal, and the third port of flow sensor P1 is grounded.

[0037] The control terminal of the first transistor Q1 is adapted to be connected to the second port of the flow sensor P1, the first terminal of the first transistor Q1 is connected to the control module 12, and the first terminal of the first transistor Q1 is adapted to receive the first power supply signal, and the second terminal of the first transistor Q1 is grounded.

[0038] Specifically, in this embodiment, the first power supply signal is a 5V voltage signal. The first port corresponds to the power supply line of the flow sensor P1, the second port corresponds to the signal line of the flow sensor P1, and the third port corresponds to the ground line of the flow sensor P1.

[0039] The first transistor Q1 is an NPN transistor. Its base is the control terminal of the first transistor Q1, its collector is the first terminal of the first transistor Q1, and its emitter is the second terminal of the first transistor Q1. The first terminal METER of the first transistor Q1 is connected to the control module 12. The flow detection signal from the flow sensor P1 is sent to the base of the first transistor Q1 through resistor R15. When the base voltage is low, the first transistor Q1 is turned on, and the first terminal METER is at a high voltage. Conversely, the first transistor Q1 is turned off, used to perform pulse signal shaping on the flow detection signal generated by the flow meter signal. Resistor R14 is a current-limiting resistor used to prevent excessive current from damaging the first transistor Q1.

[0040] Furthermore, the first port of the flow sensor P1 receives a 5V first power supply signal through a Schottky diode D1. When the input first power supply signal is higher than the forward voltage of the Schottky diode D1, the Schottky diode D1 conducts, clamping the voltage input to the subsequent circuit to near the diode's forward voltage plus the first power supply signal, preventing excessive voltage from damaging the circuit and achieving overvoltage protection. In addition, the flow meter module 11 uses a resistor R16 and a capacitor C18 to form an RC filter circuit, which bypasses high-frequency noise in the 5V first power supply signal to ground. Resistor R15 is a bias resistor, which, together with capacitor C17, provides a suitable bias voltage for the first transistor Q1.

[0041] This embodiment of the application can shape and stabilize the output signal of the flow sensor P1 to ensure the consistency of the signal level and anti-interference performance of the signal received by the control module 12, thereby improving the flow detection accuracy and system reliability. The signal conditioned by the flow meter module 11 can be acquired by the control module 12 in real time to achieve accurate feedback and closed-loop control of the flow of the peristaltic pump 20.

[0042] Figure 3 The circuit structure of the control module 12 described above is shown. In some embodiments of this application, the control module 12 includes a microcontroller unit 121, such as... Figure 3 As shown, the first input terminal of the microcontroller unit 121 is connected to the flow meter module 11 to receive the flow detection signal generated by the flow meter module 11 through the first input terminal.

[0043] Specifically, in this embodiment, the microcontroller unit 121 uses an STM32F103ZET6 microcontroller U1. Its pin PB11 serves as the first input terminal of the microcontroller unit 121, connected to the first terminal METER of the first transistor Q1 to receive the flow detection signal generated by the flow meter module 11. Furthermore, the microcontroller integrates multiple GPIO pins, a UART serial port, and a CAN controller. This not only meets the signal interaction requirements with the flow meter module 11 but also enables program burning, debugging, and fault log export via the serial port. The CAN bus ensures synchronous communication for multi-pump collaborative control. Its powerful processing capabilities allow for rapid execution of PID adaptive adjustment algorithms, providing hardware support for flow closed-loop control and multi-pump collaborative logic.

[0044] The first and second output terminals of the microcontroller unit 121 are connected to the peristaltic pump drive module 13. The microcontroller unit 121 is configured to generate control signals through the first and second output terminals and send them to the peristaltic pump drive module 13.

[0045] Specifically, the PC8 pin of the microcontroller U1 serves as the first output terminal of the aforementioned microcontroller unit 121, and the PC9 pin of the microcontroller U1 serves as the second output terminal of the aforementioned microcontroller unit 121. The control signal output from the PC8 pin is used to control the motor stepping amount of the peristaltic pump drive module 13 driving the peristaltic pump 20, and the control signal output from the PC9 pin is used to control the motor direction of the peristaltic pump drive module 13 driving the peristaltic pump 20.

[0046] In this embodiment, the microcontroller unit 121 can acquire and process the signal output by the flow meter module 11 in real time, and accordingly precisely control the start, stop, and speed of the peristaltic pump 20 to achieve stable closed-loop regulation. Furthermore, the control signals are distributed via the CAN FD bus at 2ms intervals. After each peristaltic pump 20 executes the drive command corresponding to the control signal, it transmits its operating status back via CAN FD. Abnormal events are recorded in the built-in flash memory of the microcontroller U1, and fault logs can be exported via the UART interface.

[0047] In some embodiments of this application, the peristaltic pump 20 is a stepper motor. Figure 4 The circuit structure of the peristaltic pump drive module 13 described above is shown, as follows: Figure 4As shown, each peristaltic pump drive module 13 includes a motor drive chip U3. The steering control terminal of the motor drive chip U3 serves as one input control terminal of the peristaltic pump drive module 13 and is connected to the first output terminal of the microcontroller unit 121. The phase control terminal of the motor drive chip U3 serves as another input control terminal of the peristaltic pump drive module 13 and is connected to the second output terminal of the microcontroller unit 121, so as to receive control signals through the steering control terminal and the phase control terminal. The first drive terminal, second drive terminal, third drive terminal and fourth drive terminal of the motor drive chip U3 are connected to a stepper motor to control the steering and phase of the stepper motor.

[0048] Specifically, the motor driver chip U3 can be a driver chip with the model number DRV8825PWPR. Its pins VMA and VMB are connected to a 24V power supply signal, and a 100uF electrolytic capacitor and a 100nF ceramic capacitor are respectively connected between pins VMA and VMB and ground to achieve high-frequency filtering.

[0049] The DIR pin of the motor driver chip U3 serves as the aforementioned steering control terminal, determining the driving direction of the stepper motor. The STEP pin serves as the aforementioned phase control terminal. Pins A1, A2, B1, and B2 are respectively the aforementioned first driving terminal, second driving terminal, third driving terminal, and fourth driving terminal, corresponding to the phase driving lines of phases A1, A2, B1, and B2 of the stepper motor, thereby driving the stepper motor to rotate according to a specific phase excitation sequence.

[0050] The stepper motor includes two-phase windings, each with two terminals. Pins A1 and A2 correspond to the two terminals of one phase winding, and pins B1 and B2 correspond to the two terminals of the other phase winding. When the STEP pin receives a control signal, the motor driver chip U3 drives the stepper motor to rotate one step in the corresponding direction through pins A1, A2, B1, and B2.

[0051] Therefore, the embodiments of this application can accurately control the driving phase sequence and rotation direction of the stepper motor, ensuring that the peristaltic pump 20 operates smoothly and responds quickly, which is beneficial to improving the control accuracy of the peristaltic pump 20.

[0052] Furthermore, in some embodiments of this application, the motor drive chip U3 also includes a first detection terminal and a second detection terminal. The first detection terminal serves as an output detection terminal of the peristaltic pump drive module 13 and is connected to the second input terminal of the microcontroller unit 121. The second detection terminal serves as another output detection terminal of the peristaltic pump drive module 13 and is connected to the third input terminal of the microcontroller unit 121, so as to detect the load status of the peristaltic pump 20 and generate a load detection signal to be fed back to the control module 12.

[0053] The control module 12 is also configured to adjust the control signal according to the load condition. Specifically, pin ISENA of the motor driver chip U3 is connected to pin PB4 of the microcontroller U1 as the first detection terminal, and pin ISENB is connected to pin PB5 of the microcontroller U1 as the second detection terminal. Current is detected through pins ISENA and ISENB to provide feedback on changes in the motor load.

[0054] Therefore, this application can monitor changes in motor load in real time and dynamically adjust the drive output, effectively avoiding overload or idling of the peristaltic pump 20, and improving the system's adaptability and operational reliability. In some embodiments of this application, each peristaltic pump drive module 13 drives one peristaltic pump 20. Each peristaltic pump drive module 13 receives control signals synchronously sent by the control module 12 to collaboratively achieve precise flow distribution and timing synchronization with the peristaltic pump 20.

[0055] In some embodiments of this application, the peristaltic pump flow monitoring circuit 10 further includes a power conversion module 14, such as... Figure 5 As shown, the power conversion module 14 includes a step-down chip U7. Specifically, the step-down chip U7 is model LM2575SX-5.0 / NOPB. The input terminal of the step-down chip U7 is adapted to receive a 24V second power supply signal to step down the second power supply signal to obtain the aforementioned 5V first power supply signal. The output terminal of the step-down chip U7 is adapted to output the first power supply signal. The Schottky diode D2 and electrolytic capacitor C1 are used for the reverse voltage surge protection circuit, while the inductor L1, electrolytic capacitor C2, and Schottky diode D3 are used to eliminate 5V output surges and increase its reliability.

[0056] In some embodiments of this application, the circuit further includes a voltage regulator module 15. Figure 6 and Figure 7 The circuit structure of the voltage regulator module 15 is shown, as follows: Figure 6 As shown, the voltage regulator module 15 includes a Zener diode U9, wherein the cathode of the Zener diode U9 is adapted to be connected to the reset port RST of the microcontroller power supply, and the cathode of the Zener diode U9 is also adapted to receive the first power supply signal. The control electrode of the Zener diode U9 is connected to the cathode of the Zener diode U9, and the anode of the Zener diode U9 is grounded.

[0057] Specifically, the Zener diode U9 can be a TL431. The cathode of Zener diode U9 is connected to the RST pin of microcontroller U1 via resistors R12 and R13, where resistor R12 is a 1kΩ current-limiting resistor. When the first power supply signal is greater than 5V, Zener diode U9 conducts, shorting the cathode and anode, pulling the cathode voltage down to below 5V. Then, Zener diode U9 immediately cuts off, disconnecting the cathode and anode, causing the cathode voltage to rise back above 5V. This cycle repeats, stabilizing the signal output to the reset port at 5V and preventing erroneous resets caused by signal fluctuations at the reset port.

[0058] like Figure 7 As shown, the voltage regulator module 15 also includes a voltage regulator chip U5, which can be an AMS1117-3.3. It receives the first power supply signal and converts the 5V first power supply signal into a 3.3V third power supply signal, which is then input to the microcontroller U1 for power supply.

[0059] In some embodiments of this application, the circuit further includes a switch module 16. Figure 8 The circuit structure of the switch module 16 is shown, as follows: Figure 8 As shown, the switch module 16 includes a push-button switch SW1, a power management chip U3, and a second transistor Q2. The first terminal of the push-button switch SW1 is grounded, and the second terminal of the push-button switch SW1 is adapted to connect to the input terminal of the power management chip U3. The output terminal of the power management chip U3 is connected to the control terminal of the second transistor Q2. The first terminal of the second transistor Q2 is connected to a second power supply signal, and the second terminal of the second transistor Q2 is connected to the control module 12.

[0060] Specifically, the power management chip U3 can be model LTC2950ITS8-1#TRPBF. When the power management chip U3 is initially powered on, the enable pin EN is high, keeping the second transistor Q2 off. When a button is pressed, after the power management chip U3's built-in anti-bounce processing, it releases a low-level enable signal, making the enable pin EN low. This enable signal triggers the second transistor Q2 to conduct, allowing the 24V second power supply signal to be transmitted to the power output port POWEROUT via the second transistor Q2. That is, the power output port POWEROUT outputs a 24V high level, powering on the system. When the button is pressed again, the INT pin of the power management chip U3 goes low, pulling the KILL signal low and triggering the second transistor Q2 to turn off. The power output port POWEROUT outputs a 0V low level, powering off the system.

[0061] In some embodiments of this application, the power output port POWEROUT is connected to the input terminal of the step-down chip U7 in the power conversion module 14 to input a second power supply signal of 24V.

[0062] Therefore, in this embodiment, the switch module 16 enables one-button start and stop functions, and the power management chip U3 enables soft start and power failure protection, thereby improving system safety and ease of operation.

[0063] In some embodiments of this application, the circuit further includes a serial port module 17. Figure 9 The circuit structure of the serial port module 17 is shown, as follows: Figure 9 As shown, the serial port module 17 includes a USB interface USB1 and a serial port conversion chip U2. The USB interface USB1 is connected to the input terminal of the serial port conversion chip U2, and the output terminal of the serial port conversion chip U2 is connected to the control module 12 so as to perform software debugging of the control program of the control module 12 through the USB interface USB1.

[0064] Specifically, the serial port converter chip U2 can be a CH340N, with its pins UD+ and UD- connected to the D+ and D- interfaces of the USB interface USB1, respectively. The RXD pin of the serial port converter chip U2 is connected to the PA9 pin of the microcontroller U1, and the TXD pin is connected to the PA10 pin of the microcontroller U1. The VCC pin of the serial port converter chip U2 is connected to the 5V first power supply signal via a 100nF filter capacitor. This embodiment of the application uses the serial port converter chip U2 to achieve the conversion between the USB interface USB1 and the UART serial port, thereby allowing the adaptive PID control algorithm of the microcontroller U1 to be debugged through the USB interface USB1.

[0065] Therefore, the serial port module 17 in this application facilitates online system debugging and firmware upgrades, simplifies maintenance processes, and improves development and calibration efficiency.

[0066] In addition, the serial port module 17 also includes a serial port indicator light unit, such as... Figure 10 As shown, the PA9 pin of the microcontroller U1 is connected to the serial port indicator light unit. When the serial port sends data, the control terminal of the third transistor Q3 receives a low-level signal, which turns on the third transistor Q3 and the fourth transistor Q4, thereby causing the light-emitting diode LED1 to blink. The lighting time of the light-emitting diode LED1 can be adjusted by adjusting the size of the capacitor C20.

[0067] Accordingly, this application also provides a peristaltic pump system, including at least one peristaltic pump 20, and a peristaltic pump flow monitoring circuit 10 as described in the above embodiments, wherein the peristaltic pump flow monitoring circuit 10 is connected to each of the peristaltic pumps 20.

[0068] The specific configurations and further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0069] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0070] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0072] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0073] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A peristaltic pump flow monitoring circuit, characterized in that, The circuit includes a flow meter module, a control module, and multiple peristaltic pump drive modules, each of which drives one peristaltic pump. The flow meter module is connected to the control module to detect the flow rate of the liquid flowing through the peristaltic pump in real time and generate a flow detection signal to be fed back to the control module. The control module is configured to generate a control signal based on the flow detection signal; The input control terminal of each of the peristaltic pump drive modules is connected to the control module to receive the control signal and drive the cooperative operation of each peristaltic pump according to the control signal; Each of the peristaltic pump drive modules has its output detection terminal connected to the control module to output the load detection signal of the peristaltic pump and send the load detection signal to the control module, so that the control module adjusts the control signal according to the load detection signal.

2. The peristaltic pump flow monitoring circuit according to claim 1, characterized in that, The flow meter module includes: A flow sensor, wherein a first port of the flow sensor is adapted to receive a first power supply signal, a second port of the flow sensor is adapted to output the flow detection signal, and a third port of the flow sensor is grounded; A first transistor, wherein the control terminal of the first transistor is adapted to be connected to the second port of the flow sensor, the first terminal of the first transistor is connected to the control module, and the first terminal of the first transistor is adapted to receive the first power supply signal, and the second terminal of the first transistor is grounded.

3. The peristaltic pump flow monitoring circuit according to claim 1, characterized in that, The control module includes a microcontroller unit; The first input terminal of the microcontroller unit is connected to the flow meter module to receive the flow detection signal generated by the flow meter module through the first input terminal. The first and second output terminals of the microcontroller unit are connected to the peristaltic pump drive module. The microcontroller unit is configured to generate the control signal through the first and second output terminals and send it to the peristaltic pump drive module.

4. The peristaltic pump flow monitoring circuit according to claim 3, characterized in that, The peristaltic pump is a stepper motor. Each peristaltic pump drive module includes a motor drive chip. The steering control terminal of the motor drive chip is connected to the first output terminal of the microcontroller unit as one input control terminal of the peristaltic pump drive module. The phase control terminal of the motor drive chip is connected to the second output terminal of the microcontroller unit as another input control terminal of the peristaltic pump drive module, so as to receive the control signal through the steering control terminal and the phase control terminal. The first, second, third, and fourth driving terminals of the motor driver chip are connected to the stepper motor to control the direction and phase of the stepper motor.

5. The peristaltic pump flow monitoring circuit according to claim 4, characterized in that, The microcontroller unit further includes a second input terminal and a third input terminal. The motor driver chip further includes a first detection terminal and a second detection terminal. The first detection terminal serves as one output detection terminal of the peristaltic pump driver module and is connected to the second input terminal of the microcontroller unit. The second detection terminal serves as the other output detection terminal of the peristaltic pump driver module and is connected to the third input terminal of the microcontroller unit, so as to detect the load status of the peristaltic pump and generate the load detection signal to be fed back to the control module.

6. The peristaltic pump flow monitoring circuit according to claim 2, characterized in that, The circuit also includes a power conversion module, which includes a step-down chip. The input terminal of the step-down chip is adapted to receive a second power supply signal, so as to step down the second power supply signal to obtain the first power supply signal, and output the first power supply signal through the output terminal of the step-down chip.

7. The peristaltic pump flow monitoring circuit according to claim 3, characterized in that, The circuit also includes a voltage regulator module, which includes a Zener diode. The cathode of the Zener diode is adapted to be connected to the reset port of the microcontroller power supply, and the cathode of the Zener diode is also adapted to receive a first power supply signal. The control electrode of the Zener diode is connected to the cathode of the Zener diode, and the anode of the Zener diode is grounded.

8. The peristaltic pump flow monitoring circuit according to claim 1, characterized in that, The circuit also includes a switching module, which includes a push-button switch, a power management chip, and a second transistor. The first terminal of the push-button switch is grounded, the second terminal of the push-button switch is adapted to connect to the input terminal of the power management chip, the output terminal of the power management chip is connected to the control terminal of the second transistor, the first terminal of the second transistor is connected to the second power supply signal, and the second terminal of the second transistor is connected to the control module.

9. The peristaltic pump flow monitoring circuit according to claim 1, characterized in that, The circuit also includes a serial port module, which includes a USB interface and a serial port conversion chip. The USB interface is connected to the input terminal of the serial port conversion chip, and the output terminal of the serial port conversion chip is connected to the control module to perform software debugging of the control program of the control module through the USB interface.

10. A peristaltic pump system, characterized in that, The system includes: At least one peristaltic pump; And a peristaltic pump flow monitoring circuit as described in any one of claims 1 to 9, wherein the peristaltic pump flow monitoring circuit is connected to each of the peristaltic pumps respectively.

Images