Intelligent multi-parameter monitoring controller for fluid pump

Abstract

According to the intelligent multi-parameter monitoring controller for the fluid pump, provided by the invention, the MCU of a plurality of external differential input channels is supported on the basis of an internal ADC to realize the control module U1, a plurality of MEMS sensors are directly connected with the control module U1, and voltage signals or current signals acquired by the MEMS sensors are directly sent into the control module U1; the control module U1 generates corresponding analog signals according to electric signals transmitted by each MEMS sensor, an independent ASIC or MCU does not need to be configured for each MEMS sensor, the electric signals of the sensors can be processed through the MCU chip of the control module U1, control over the fluid pump can be achieved, and the overall cost of the controller is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to an intelligent multi-parameter monitoring controller for a fluid pump. Background Art

[0002] A fluid pump is a device used to move fluid (gas or liquid) from one location to another. It achieves fluid transportation by increasing the pressure of the fluid. Fluid pumps are widely used in industry, agriculture, construction, healthcare, and daily life. They are used for various purposes, such as water supply, irrigation, pressurization, circulation, and sewage disposal, as well as gas transportation such as ventilators and air pumps. In some complex scenarios, fluid pumps need to refer to fluid parameters such as pressure, flow, temperature, and operating parameters of the fluid pump (such as operating current) to control the fluid pump. These fluid parameters are usually measured by dedicated sensors.

[0003] The structure of conventional commercial sensor modules currently used in the market is: "1 MEMS sensor + 1 ASIC / MCU + 1 or more parameter output pins". The current signal or voltage signal collected by the MEMS sensor is calibrated by the ASIC or MCU set inside the sensor module to become an accurate analog signal / digital signal, and then sent out of the sensor through the output pin to be converted or read by the external ADC / MCU. For example, the patent application number CN201620556192.9 discloses a water pump controller with motor online insulation monitoring function. Figure 1 It can be seen that it uses a current sensor and a voltage sensor at the same time. The signal output end of the voltage sensor and the signal output end of the current sensor are respectively connected to the signal input end of the analog-to-digital converter. That is, the two sensors output analog signals calibrated by the ASIC inside the sensor module. The analog signals are then sent out of the sensor module, converted into digital signals by the external analog-to-digital converter ADC, and then sent to the microcontroller to control the start and stop of the motor.

[0004] However, when measuring the physical parameters of multiple fluids, multiple sensor modules with a structure of "one MEMS sensor + one ASIC / MCU + one or more parameter output pins" are required, which undoubtedly incurs a significant cost. Given this situation, how to simultaneously and cost-effectively detect the physical parameters of multiple external gases or liquids and achieve precise control of the operating status of external devices has become a pressing technical challenge in this field. Utility Model Content

[0005] In order to solve the problem of high cost of the technical scheme of controlling the fluid equipment based on multiple sensors in the prior art, the utility model provides intelligent multi parameter monitoring controller for fluid pump, it can realize the accurate control of fluid pump based on multiple MEMS sensors with lower cost.

[0006] The technical scheme of the utility model is as follows: intelligent multi parameter monitoring controller for fluid pump, characterized in that, it includes:

[0007] Fluid parameter physical quantity input mechanism, control module U1 and fluid pump operation regulator;

[0008] The control module U1 is realized based on the MCU of internal ADC supporting multiple external differential input channels;

[0009] The fluid parameter physical quantity input mechanism includes: MEMS sensor for fluid parameter monitoring for reference when fluid pump is running;The number of the MEMS sensor is greater than or equal to 1;Each MEMS sensor is arranged on the corresponding detection position of the monitored fluid pump, all the MEMS sensors are electrically connected with the control module U1, and the MEMS sensor converts the detected parameter physical quantity into an electrical signal and directly inputs into the control module U1;

[0010] The control module U1 receives the fluid parameter electrical signal collected by all the MEMS sensors, converts into corresponding ADC values based on the internal ADC module, generates a control signal and sends to the fluid pump operation regulator;

[0011] The fluid pump operation regulator is electrically connected with the monitored fluid pump and controls the operation of the monitored fluid pump based on the control signal.

[0012] Further characterized in that:

[0013] The MEMS sensor in the fluid parameter physical quantity input mechanism includes: pressure sensor S1, flow sensor S2, temperature sensor S3 and current sensor S4;

[0014] The fluid pump operation regulator includes: NMOS tube Q2, optocoupler OP1, insulated gate bipolar transistor Q1, double-pole double-throw relay K1, external power supply interface RS3 and fluid pump rotating speed adjustment interface RS4;The fluid pump rotating speed adjustment interface RS4 is connected with the power supply input interface of the fluid pump;The external power supply interface RS3 is connected with external DC power supply;

[0015] The fluid pump operation regulator further includes: resistance R3-R6, bidirectional transient voltage suppressor D1 and regulator power supply interface RS1;

[0016] The 1-pin of the fluid pump rotating speed adjusting interface RS4 is connected to one end of the bidirectional TVS diode D1, and then connected to the 3-pin of the double-pole double-throw relay K1; the 2-pin of the fluid pump rotating speed adjusting interface RS4 is connected to the other end of the bidirectional TVS diode D1 and the 6-pin of the double-pole double-throw relay K1; the 1-pin of the external power supply interface RS3 is connected to the 2-pin, 5-pin of the double-pole double-throw relay K1 and one end of the resistor R4; the 2-pin of the external power supply interface RS3 is connected to the emitter E of the insulated gate bipolar transistor Q1 and the 3-pin of the optocoupler OP1;

[0017] The 1-pin of the double-pole double-throw relay K1 is connected to the 4-pin of the control module U1, and the 4-pin of the double-pole double-throw relay K1 is connected to the 7-pin of the double-pole double-throw relay K1 and then connected to the collector C of the insulated gate bipolar transistor Q1; the 8-pin of the double-pole double-throw relay K1 is connected to the 1-pin of the control module U1;

[0018] The other end of the resistor R4 is connected to the gate G of the insulated gate bipolar transistor Q1 and then connected to the 4-pin of the optocoupler OP1; the 1-pin of the optocoupler OP1 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to one end of the resistor R5 and then connected to the 2-pin of the control module U1; the 2-pin of the optocoupler OP1 is connected to the other end of the resistor R5 and the drain D of the NMOS tube Q2; the source S of the NMOS tube Q2 is connected to one end of the resistor R6 and then grounded, and the gate G of the NMOS tube Q2 is connected to the other end of the resistor R6 and then connected to the 5-pin of the control module U1;

[0019] The 1-pin of the regulator power supply interface RS1 is connected to the 4-pin of the control module U1, and the 2-pin of the regulator power supply interface RS1 is connected to the 3-pin of the control module U1;

[0020] The fluid pump running regulator further comprises a bus interface RS2 for providing an interface for external data communication; the 1-pin of the bus interface RS2 is connected to the 7-pin of the control module U1, and the 2-pin of the bus interface RS2 is connected to the 8-pin of the control module U1;

[0021] The fluid parameter physical quantity input mechanism further comprises decoupling capacitors C1-C4;

[0022] The 1-pin of the pressure sensor S1 is connected to the 18-pin of the control module U1, the 2-pin of the pressure sensor S1 is connected to one end of the capacitor C1 and the 2-pin of the control module U1; the 3-pin of the pressure sensor S1 is connected to the 20-pin of the control module U1, the 4-pin of the pressure sensor S1 is grounded, and the other end of the capacitor C1 is grounded;

[0023] The 1 pin of the flow sensor S2 is connected to the 15 pin of the control module U1, the 2 pin of the flow sensor S2 is connected to the 2 pin of the control module U1 and one end of the capacitor C2, the other end of the capacitor C2 is grounded, the 3 pin of the flow sensor S2 is connected to the 16 pin of the control module U1, and the 4 pin of the flow sensor S2 is grounded;

[0024] The 1 pin of the temperature sensor S3 is connected to the 13 pin of the control module U1, the 2 pin of the temperature sensor S3 is connected to the 2 pin of the control module U1 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, the 3 pin of the temperature sensor S3 is connected to the 14 pin of the control module U1, and the 4 pin of the temperature sensor S3 is grounded;

[0025] The 1 pin of the current sensor S4 is connected to the 11 pin of the control module U1, the 2 pin of the current sensor S4 is connected to the 2 pin of the control module U1 and one end of the capacitor C4, the other end of the capacitor C4 is grounded, the 3 pin of the current sensor S4 is connected to the 12 pin of the control module U1, and the 4 pin of the current sensor S4 is grounded;

[0026] It also includes a decoupling capacitor C0, a power indicator DS1, an alarm lamp DS2, a resistor R1 and a resistor R2;

[0027] The negative electrode of the power indicator DS1 is grounded, and the positive electrode of the power indicator DS1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the 4 pin of the control module U1;

[0028] The negative electrode of the alarm lamp DS2 is connected to the 10 pin of the control module U1, the positive electrode of the alarm lamp DS2 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the 4 pin of the control module U1;

[0029] The 3 pin of the control module U1 is grounded, the 4 pin of the control module U1 is connected to VDD and one end of the decoupling capacitor C0, and the other end of the decoupling capacitor C0 is grounded.

[0030] The intelligent multi-parameter monitoring controller for fluid pumps provided in the present application implements the control module U1 based on an MCU with an internal ADC supporting multiple pairs of external differential input channels. Multiple MEMS sensors are directly connected to the control module U1, and the voltage signal or current signal collected by the MEMS sensor is directly sent to the control module U1. The control module U1 generates a corresponding analog signal from the electrical signal transmitted by each MEMS sensor. In the present application, there is no need to configure an independent ASIC or MCU for each MEMS sensor. The MCU chip of a control module U1 can both process the sensor electrical signal and realize the control of the fluid pump, which greatly reduces the overall cost of the controller. The present application adopts a structure of multiple MEMS sensors in conjunction with one control module U1, which supports the simultaneous measurement of the physical values ​​of multiple fluid parameters associated with the fluid pump. The control module U1 cooperates with the fluid pump operation regulator to use multiple fluid parameter values ​​measured by multiple parameter sensors to realize the control of the operation of the fluid pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the system structure of an intelligent multi-parameter monitoring controller for a fluid pump;

[0032] Figure 2 General block diagram of control module MCU;

[0033] Figure 3 Circuit connection diagram for operating the regulator for the fluid pump;

[0034] Figure 4 It is a schematic diagram of the circuit structure of the control module U1 and the sensor;

[0035] Figure 5 This is a schematic diagram of the external connections of the intelligent multi-parameter monitoring controller for body pumps. DETAILED DESCRIPTION

[0036] like Figure 1 As shown, the present application includes an intelligent multi-parameter monitoring controller for a fluid pump, which includes: a fluid parameter physical quantity input mechanism, a control module U1 and a fluid pump operation regulator.

[0037] In this application, in order to support multiple MEMS sensor inputs at the same time, the control module U1 is implemented based on an MCU whose internal ADC supports multiple pairs of external differential input channels. Figure 2 Shown is a general block diagram of the MCU type used in this application. Figure 2In the present application, only one MEMS sensor is marked, and the difference between the two pins VINP and VINN is the differential signal of the fluid parameter collected by the sensor. If there are more sensors, they can also be connected to U1 based on the same principle. MUX is a switching channel for the input, which switches the analog signals input by multiple MEMS to a certain pair of differential signals to the amplification circuit PGA and ADC processing path based on MUX. After ADC, the analog signal is converted into a digital signal, and then processed by the filter Filter and the digital signal processor DSP, and finally communicated with the outside through the bus interface Serial Interface. By controlling the module U1, the selection, amplification, AD conversion, digital calibration and generation of corresponding control signals of the electrical signals input by the MEMS sensor can be completed. In the present application, it is not necessary to configure an independent ASIC or MCU for each MEMS sensor. Through the MCU chip of the control module U1, the electrical signals of multiple MEMS sensors can be processed and the parameters can be calibrated, and the control of the fluid pump can also be realized, which greatly reduces the overall cost of the controller.

[0038] In the present embodiment, the control module U1 is realized based on the MCU chip with model MS32F7223A0ZQ. The MCU chip is built-in with a 24-bit high-precision differential input Σ-Δ type analog-to-digital converter ADC. The working voltage of the ADC is the internal LDO output voltage VLDO (which can output VDD voltage); the positive / negative end input supports 14 pairs of GND differential external single input channels (AN0~AN13), which can also form multiple pairs of external differential input channels; the built-in pre-stage gain programmable amplification circuit PGA has high input impedance; the reference voltage can be selected: VLDO, VLDO / 2, internal reference voltage VIR (which can be output from the port VIRO), external reference voltage VER (VERI input); ADC clock: 8 / 24 frequency division of the peripheral high-frequency clock FHCLK (8MHz); differential input amplification factor (including pre-stage PGA amplification) is 0.25 / 0.5 / 1 / 2 / 4 / 8 / 16 / 32 / 64 / 128 / 256; oversampling rate 64~32768, sampling rate 10Hz@32768~15.626KHz@64; support 50Hz / 60Hz power frequency filtering @ sampling rate = 10Hz; built-in temperature sensor, output voltage VTS can be used as the positive / negative end input signal of the ADC. Of course, in actual application, other MCUs or ASICs with similar functions can also be used.

[0039] The fluid parameter physical quantity input mechanism comprises: fluid pump running reference fluid parameter monitoring MEMS sensors; the number of MEMS sensors is greater than or equal to 1; each MEMS sensor is arranged at a corresponding detection position on the fluid pump, all the MEMS sensors are electrically connected with the control module U1, and the MEMS sensors convert the detected parameter physical quantity into an electrical signal and input the electrical signal into the control module U1.

[0040] The number and type of specific MEMS sensors are set according to actual needs. In the embodiment, the fluid pump is a fluid pump, and the corresponding sensors are: a pressure sensor S1, a flow sensor S2, a temperature sensor S3 and a current sensor S4, as shown in the specific implementation. Figure 4

[0041] The pressure sensor S1 is arranged at the fluid outlet of the fluid pump and detects the real-time pressure of the fluid output by the fluid pump; the flow sensor S2 is arranged at the fluid outlet of the fluid pump and detects the real-time flow of the fluid output by the fluid pump; the temperature sensor S3 is arranged on the pump body of the fluid pump and detects the real-time temperature of the fluid pump; and the current sensor S4 is arranged at the input power supply position of the fluid pump and monitors the working current of the fluid pump in real time.

[0042] In specific implementation, the electrically erasable programmable read-only memory EEPROM of the control module U1 stores a plurality of parameters of a calibration formula corresponding to each fluid parameter; the control module U1 receives the electrical signals collected by all the MEMS sensors and converts the electrical signals into digital quantities through ADC, calls the calibration parameters corresponding to the sensors, calculates the calibration value of each physical quantity through the corresponding calibration formula, and then obtains the correct value corresponding to each fluid parameter. The control module determines the current running state of the fluid pump according to the digital value of each fluid parameter, generates a control signal according to the determination result, and sends the control signal to the fluid pump running regulator. The fluid pump running regulator is electrically connected with the fluid pump and controls the running of the fluid pump by changing the high and low and positive and negative of the voltage value of the power supply output to the fluid pump through the RS4 interface. The specific calibration method for each fluid parameter can be realized based on the prior art. The control module U1 uses the SCL and SDA pins of the I2C bus for programming and mutual transmission of instructions and data with the external single-chip microcomputer MCU.

[0043] ​In the control module U1, the current operating state of the fluid pump needs to be determined according to the fluid parameter calibration value, and the current operating state of the fluid pump is determined. The determination method comprises: comparing the real-time fluid pressure of the fluid of the fluid pump attribute input by the pressure sensor S1 with the preset fluid pressure range value, determining whether the fluid pressure exceeds the range; comparing the cumulative value or real-time value of the fluid flow value input by the flow sensor S2 with the preset fluid flow range, determining whether the fluid flow exceeds the range; comparing the temperature value of the fluid pump input by the temperature sensor S3 with the preset temperature range, determining whether the temperature of the fluid pump exceeds the range; comparing the real-time operating current value of the fluid pump input by the current sensor S4 with the preset current range, determining whether the power value exceeds the range.

[0044] The preset range value of each parameter is obtained by referring to the specification book of the fluid pump. For example, according to the provisions in the equipment specification book, the allowable operating current range of the fluid pump is 1A~2A, if the real-time operating current value input by the current sensor S4 exceeds this range, the equipment needs to be stopped immediately to prevent damage to the equipment. The specific implementation method can be realized based on the prior art.

[0045] When the fluid pump occurs abnormal conditions such as over-flow, over-pressure, under-pressure, over-heat, etc., the parameter values measured by the multi-parameter sensor are respectively represented as excessive current, excessive pressure value, too small pressure value, and too high temperature. At this time, the control module U1 can stop the operation of the fluid pump in time according to the set abnormal control strategy and send alarm information, so as to meet the needs of accurate control of the fluid pump in various industries.

[0046] The fluid pump operation regulator can be realized based on various control circuits between the control module U1 and the fluid pump in the prior art. The fluid pump operation regulator in the application is as shown in Figure 3 .

[0047] The fluid pump operation regulator comprises an NMOS tube Q2, an optical coupler OP1, an insulated gate bipolar transistor (IGBT) Q1, a double-pole double-throw relay K1, a regulator power interface RS1, an external power interface RS3, a fluid pump rotating speed adjustment interface RS4, resistors R3~R6, and a bidirectional transient voltage suppressor D1.

[0048] As shown in Figure 5 , the application provides a working power VDD for the intelligent multi-parameter monitoring controller for the fluid pump through the regulator power interface RS1.

[0049] The fluid pump speed regulation interface RS4 is connected with a power supply input interface of the fluid pump; and the external power supply interface RS3 is connected with an external DC power supply VCC. The external DC power supply VCC is input through two pins of VCC_IN+ and VCC_IN- of the RS3 interface, is an external power supply arranged outside the monitoring controller, and is controlled by a PWM signal of the control module U1 to control the on-off of a light emitting diode of the optocoupler OP1, and then control the on-off of a DC power supply output by the IGBT, so that the average value of the DC power supply VCC output through two pins of VCC_OUT1 and VCC_OUT2 of the RS4 interface corresponds to the duty ratio of the PWM signal, and is finally used to regulate the speed of the fluid pump. In the embodiment, a 12V DC power supply is provided in the form of an external battery and is connected to the external power supply interface RS3.

[0050] One pin of the fluid pump speed regulation interface RS4 is connected with one end of a bidirectional TVS diode D1, and then connected with a 3-pin of a double-pole double-throw relay K1; a 2-pin of the fluid pump speed regulation interface RS4 is connected with the other end of the bidirectional TVS diode D1 and a 6-pin of the double-pole double-throw relay K1; a 1-pin of the external power supply interface RS3 is connected with a 2-pin and a 5-pin of the double-pole double-throw relay K1 and one end of a resistor R4; and a 2-pin of the external power supply interface RS3 is connected with an emitter E of an insulated gate bipolar transistor Q1 and a 3-pin of the optocoupler OP1.

[0051] A 1-pin of the double-pole double-throw relay K1 is connected with a 4-pin of the control module U1, a 4-pin of the double-pole double-throw relay K1 is connected with a 7-pin of the double-pole double-throw relay K1, and then connected with a collector C of the insulated gate bipolar transistor Q1; and an 8-pin of the double-pole double-throw relay K1 is connected with a 1-pin of the control module U1.

[0052] The other end of the resistor R4 is connected with a gate G of the insulated gate bipolar transistor Q1, and then connected with a 4-pin of the optocoupler OP1; a 1-pin of the optocoupler OP1 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with one end of a resistor R5, and then connected with a 2-pin of the control module U1; a 2-pin of the optocoupler OP1 is connected with the other end of the resistor R5 and a drain D of an NMOS tube Q2; a source S of the NMOS tube Q2 is connected with one end of a resistor R6, and then grounded; and a gate G of the NMOS tube Q2 is connected with the other end of the resistor R6, and then connected with a 5-pin of the control module U1.

[0053] A 1-pin of the regulator power supply interface RS1 is connected with a 4-pin of the control module U1, and a 2-pin of the regulator power supply interface RS1 is connected with a 3-pin of the control module U1.

[0054] The fluid pump operation regulator further comprises a bus interface RS2 providing an interface for external data communication, two pins of the RS2 interface are connected with the SCL (clock input pin of the I2C bus) and SDA (data input / output pin of the I2C bus) signals of the I2C bus respectively, the 1 pin of the bus interface RS2 is connected with the 7 pin of the control module U1, and the 2 pin of the bus interface RS2 is connected with the 8 pin of the control module U1. When data communication with external equipment is needed, data communication is carried out based on the bus interface RS2. In the embodiment, when calibration procedures for each parameter in the control module are needed, the calibration system can be connected with the bus interface RS2 to transmit the calibration parameters into the control module U1, so that the calibration process is realized.

[0055] The fluid parameter physical quantity input mechanism further comprises decoupling capacitors C1-C4, the 1 pin of the pressure sensor S1 is connected with the 18 pin of the control module U1, the 2 pin of the pressure sensor S1 is connected with one end of the capacitor C1 and the 2 pin of the control module U1, the 3 pin of the pressure sensor S1 is connected with the 20 pin of the control module U1, the 4 pin of the pressure sensor S1 is grounded, and the other end of the capacitor C1 is grounded.

[0056] The 1 pin of the flow sensor S2 is connected with the 15 pin of the control module U1, the 2 pin of the flow sensor S2 is connected with the 2 pin of the control module U1 and one end of the capacitor C2, the other end of the capacitor C2 is grounded, the 3 pin of the flow sensor S2 is connected with the 16 pin of the control module U1, and the 4 pin of the flow sensor S2 is grounded.

[0057] The 1 pin of the temperature sensor S3 is connected with the 13 pin of the control module U1, the 2 pin of the temperature sensor S3 is connected with the 2 pin of the control module U1 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, the 3 pin of the temperature sensor S3 is connected with the 14 pin of the control module U1, and the 4 pin of the temperature sensor S3 is grounded.

[0058] The 1 pin of the current sensor S4 is connected with the 11 pin of the control module U1, the 2 pin of the current sensor S4 is connected with the 2 pin of the control module U1 and one end of the capacitor C4, the other end of the capacitor C4 is grounded, the 3 pin of the current sensor S4 is connected with the 12 pin of the control module U1, and the 4 pin of the current sensor S4 is grounded.

[0059] When the control module U1 makes the CTRL_PWR pin output a high level, the G electrode of the NMOS tube Q2 is high, and the S electrode and the D electrode are turned on. At this time, no matter whether the level of the CTRL_PWM pin is high or low, the cathode of the input end of the optocoupler OP1 is always low, the light-emitting diode of the optocoupler OP1 works, and the output end is connected. In this case, the pressure difference between the two ends of the RS4 interface is always 0, and the fluid pump does not work.

[0060] When the control module U1 sets the CTRL_PWR pin to a low level, the G pole of Q2 is at a low level, and its S pole and D pole are disconnected; at this time, the level of the cathode of the input end of the optocoupler OP1 is determined by the level of the CTRL_PWM pin. In this case, the output voltage difference between the two ends of the RS4 interface is controlled by the CTRL_PWM pin.

[0061] Once some situations occur that require the fluid pump to be shut down, for example: the fluid pressure value detected by the control module U1 does not match the current value, and the current value of the fluid pump obviously exceeds the normal range, the control module U1 will make the CTRL_ALARM pin output a low level and light up the alarm LED; at the same time, when the CTRL_PWR pin outputs a high level, the fluid pump will stop running.

[0062] based on Figure 3 The circuit shown can directly reduce the average voltage of the DC power supply output by RS4 through the PWM signal CTRL_PWM to control the stalling of the fluid pump. In most MCUs, the minimum duty cycle of the PWM signal cannot be set to 0%, but at least a value slightly greater than 0%. Similarly, the minimum duty cycle of the PWM signal CTRL_PWM in the technical solution of the present application is at least slightly greater than 0, so the minimum average voltage of the DC power supply output by RS4 controlled by CTRL_PWM will also be slightly greater than 0, which is not necessarily sufficient to ensure that the fluid pump is completely stalled. Therefore, NMOS tube Q2 is provided in the present application. When the fluid pump needs to be completely stopped, it is necessary to use the CTRL_PWR signal to turn off the light-emitting end of the optocoupler so that the voltage of the DC power supply output by RS4 is 0, ensuring that the fluid pump can be quickly controlled to stop.

[0063] At the same time, the technical solution of the present application also supports the control of the speed and rotation direction of the fluid pump, which can be selectively used according to the needs of specific scenarios.

[0064] When control module U1 outputs a high level on the CTRL_PWM pin, there is no voltage difference at the input of optocoupler OP1, its LED turns off, and its output is disconnected. At this time, the G pin of IGBT Q1 is high, Q1's E and C terminals are connected, and the voltage difference across the RS4 interface equals the voltage difference across the RS3 interface. When the CTRL_PWM pin outputs a low level, there is a voltage difference at the input of optocoupler OP1, the LED operates, and the output is connected. The G pin of IGBT Q1 is low, Q1's E and C terminals are disconnected, and the voltage difference across the RS4 interface is zero. As needed, the microcontroller (MCU) causes the CTRL_PWM pin to transmit PWM signals with varying duty cycles at a constant frequency. This generates an average voltage across the RS4 interface corresponding to the duty cycle, thereby adjusting the fluid pump's speed. The specific control method for PWM signals with varying duty cycles can be implemented using the control method of the MS32F7223A0ZQ MCU chip.

[0065] When the single-chip microcomputer MCU makes the CTRL_MOTOR_REV pin output a high level, there is no voltage difference across the electromagnetic coil of the double-pole double-throw relay K1, the contact is not in action, and the normally closed contact is closed. At this time, the VCC_OUT1 and VCC_OUT2 of the RS4 interface are respectively connected to the positive and negative ends of the direct-current power supply VCC after the voltage regulation of the IGBT Q1, and the fluid pump rotates forward. When the CTRL_MOTOR_REV pin outputs a low level, there is a voltage difference across the electromagnetic coil of the double-pole double-throw relay K1, and the current in the coil generates a magnetic field. This magnetic field will attract the armature to move against the spring force, thereby causing the normally open contact to close. At this time, the VCC_OUT1 and VCC_OUT2 of the RS4 interface are respectively connected to the negative and positive ends of the direct-current power supply after the voltage regulation of the IGBT Q1, and the fluid pump reverses.

[0066] In order to be more practical, the application also provides a power indicator lamp DS1 and an alarm lamp DS2. The negative electrode of the power indicator lamp DS1 is connected to the ground, the positive electrode of the power indicator lamp DS1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the 4th pin of the control module U1. The negative electrode of the alarm lamp DS2 is connected to the 10th pin of the control module U1, the positive electrode of the alarm lamp DS2 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the 4th pin of the control module U1. When an alarm occurs, the MCU makes CTRL_ALARM output a low level, and at this time the alarm LED lamp is lit.

[0067] The 3rd pin of the control module U1 is connected to the ground, and the 4th pin of the control module U1 is connected to VDD and one end of the decoupling capacitor C0, and the other end of the decoupling capacitor C0 is connected to the ground.

[0068] The technical scheme of the application can receive external instructions or data information in real time through the linkage action between the modules, measure the pressure, flow, temperature and current physical quantities of the fluid pump at the same time or at different times, obtain the values of the calibrated pressure, flow, temperature and current physical quantities, use the values of the measured physical quantities as control parameters according to the set control rules, control the rotating speed of the fluid pump, and switch the fluid pump to rotate forward or reverse. When the temperature or power supply current of the fluid pump is abnormal, the alarm LED lamp can be lit to stop the operation of the fluid pump.

[0069] Since the polarities of the DC power supply VCC_OUT1 and VCC_OUT2 connected to both ends of the DC motor of the fluid pump are uncertain, a bidirectional TVS diode D1 is connected in parallel across the RS4 interface to release the back electromotive force current generated when the motor stops. When the motor stops and generates a back electromotive force, if the back electromotive force is too large, the bidirectional TVS diode can conduct in either direction. Therefore, regardless of the polarity of the back electromotive force generated by the motor, once the forward or reverse voltage exceeds the breakdown voltage of the TVS diode, the diode will conduct, providing a discharge path to absorb the back electromotive force current, thereby protecting the motor front-end circuit from damage caused by excessive back electromotive force.

[0070] The intelligent multi-parameter monitoring controller of the present application has a 5V or 3.3V dual power supply mode. It adopts a PCBA packaging form, is easy to install and operate, has multiple functions, and is highly practical. The calculated values of pressure, flow rate, temperature and current physical quantities are accurate and reliable. Compared with using multiple single-parameter sensors at the same time, it saves cost. By monitoring the fluid pump using multiple parameters of pressure, flow rate, temperature and current at the same time, it can support the adjustment of the start-stop, speed and direction of the fluid pump, and perform alarm and abnormal processing, meeting the needs of accurate control of fluid pumps in various scenarios.

[0071] It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those skilled in the art, without departing from the spirit and essence of the present disclosure, the types and numbers of MEMS sensors, fluid pumps and DC motors can be increased, various modifications and improvements can be made, and the application range of the intelligent multi-parameter monitoring controller can be widened, and these modifications, improvements and widenings are also regarded as the protection scope of the present disclosure.

Claims

1. Intelligent multi-parameter monitoring controller for fluid pumps, characterized in that: It includes: Fluid parameter physical quantity input mechanism, control module U1 and fluid pump operation regulator; The control module U1 is implemented based on an MCU whose internal ADC supports multiple pairs of external differential input channels; The fluid parameter physical quantity input mechanism includes: a MEMS sensor for monitoring the fluid parameter as a reference when the fluid pump is running; the number of the MEMS sensors is greater than or equal to 1; each MEMS sensor is arranged at a corresponding detection position on the monitored fluid pump, and all the MEMS sensors are electrically connected to the control module U1, and the MEMS sensors convert the detected parameter physical quantity into an electrical signal and directly input it into the control module U1; The control module U1 receives all the fluid parameter electrical signals collected by the MEMS sensors, converts them into corresponding ADC values ​​based on the internal ADC module, generates a control signal, and sends it to the fluid pump operation regulator; The fluid pump operation regulator is electrically connected to the monitored fluid pump and controls the operation of the monitored fluid pump based on the control signal.

2. The intelligent multi-parameter monitoring controller for a fluid pump according to claim 1, characterized in that: The MEMS sensors in the fluid parameter physical quantity input mechanism include: a pressure sensor S1, a flow sensor S2, a temperature sensor S3 and a current sensor S4.

3. The intelligent multi-parameter monitoring controller for a fluid pump according to claim 1, characterized in that: The fluid pump operation regulator includes: an NMOS tube Q2, an optocoupler OP1, an insulated gate bipolar transistor Q1, a double-pole double-throw relay K1, an external power supply interface RS3 and a fluid pump speed adjustment interface RS4; the fluid pump speed adjustment interface RS4 is connected to the power supply input interface of the fluid pump; the external power supply interface RS3 is connected to an external DC power supply.

4. The intelligent multi-parameter monitoring controller for a fluid pump according to claim 3, characterized in that: The fluid pump operation regulator further includes: resistors R3 to R6, a bidirectional transient voltage suppressor D1 and a regulator power supply interface RS1; Pin 1 of the fluid pump speed regulating interface RS4 is connected to one end of the bidirectional TVS diode D1 and then to pin 3 of the double-pole double-throw relay K1; pin 2 of the fluid pump speed regulating interface RS4 is connected to the other end of the bidirectional TVS diode D1 and pin 6 of the double-pole double-throw relay K1; pin 1 of the external power supply interface RS3 is connected to pins 2 and 5 of the double-pole double-throw relay K1 and one end of the resistor R4; pin 2 of the external power supply interface RS3 is connected to the emitter E of the insulated gate bipolar transistor Q1 and pin 3 of the optocoupler OP1; Pin 1 of the double-pole double-throw relay K1 is connected to pin 4 of the control module U1, and pin 4 of the double-pole double-throw relay K1 is connected to pin 7 of the double-pole double-throw relay K1 and then connected to the collector C of the insulated gate bipolar transistor Q1; pin 8 of the double-pole double-throw relay K1 is connected to pin 1 of the control module U1; The other end of the resistor R4 is connected to the gate G of the insulated gate bipolar transistor Q1 and then to pin 4 of the optocoupler OP1; pin 1 of the optocoupler OP1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R5 and then to pin 2 of the control module U1; pin 2 of the optocoupler OP1 is connected to the other end of the resistor R5 and the drain D of the NMOS transistor Q2; the source S of the NMOS transistor Q2 is connected to one end of the resistor R6 and then to ground, and the gate G of the NMOS transistor Q2 is connected to the other end of the resistor R6 and then to pin 5 of the control module U1; Pin 1 of the regulator power interface RS1 is connected to pin 4 of the control module U1 , and pin 2 of the regulator power interface RS1 is connected to pin 3 of the control module U1 .

5. The intelligent multi-parameter monitoring controller for a fluid pump according to claim 3, characterized in that: The fluid pump operation regulator also includes: a bus interface RS2, which provides an interface for external data communication; pin 1 of the bus interface RS2 is connected to pin 7 of the control module U1, and pin 2 of the bus interface RS2 is connected to pin 8 of the control module U1.

6. The intelligent multi-parameter monitoring controller for a fluid pump according to claim 2, characterized in that: The fluid parameter physical quantity input mechanism also includes: decoupling capacitors C1 to C4; Pin 1 of the pressure sensor S1 is connected to pin 18 of the control module U1, and pin 2 of the pressure sensor S1 is connected to one end of the capacitor C1 and pin 2 of the control module U1; pin 3 of the pressure sensor S1 is connected to pin 20 of the control module U1, pin 4 of the pressure sensor S1 is grounded, and the other end of the capacitor C1 is grounded; Pin 1 of the flow sensor S2 is connected to pin 15 of the control module U1, pin 2 of the flow sensor S2 is connected to pin 2 of the control module U1 and one end of the capacitor C2, the other end of the capacitor C2 is grounded, pin 3 of the flow sensor S2 is connected to pin 16 of the control module U1, and pin 4 of the flow sensor S2 is grounded; Pin 1 of the temperature sensor S3 is connected to pin 13 of the control module U1, pin 2 of the temperature sensor S3 is connected to pin 2 of the control module U1 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, pin 3 of the temperature sensor S3 is connected to pin 14 of the control module U1, and pin 4 of the temperature sensor S3 is grounded; Pin 1 of the current sensor S4 is connected to pin 11 of the control module U1, pin 2 of the current sensor S4 is connected to pin 2 of the control module U1 and one end of the capacitor C4, the other end of the capacitor C4 is grounded, pin 3 of the current sensor S4 is connected to pin 12 of the control module U1; pin 4 of the current sensor S4 is grounded.

7. The intelligent multi-parameter monitoring controller for a fluid pump according to claim 1, characterized in that: It also includes: a decoupling capacitor C0, a power indicator light DS1, a warning light DS2, a resistor R1 and a resistor R2; The negative electrode of the power indicator light DS1 is grounded, the positive electrode of the power indicator light DS1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to pin 4 of the control module U1; The negative electrode of the warning light DS2 is connected to the 10th pin of the control module U1, the positive electrode of the warning light DS2 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the 4th pin of the control module U1; Pin 3 of the control module U1 is grounded, pin 4 of the control module U1 is connected to VDD and one end of the decoupling capacitor C0 , and the other end of the decoupling capacitor C0 is grounded.

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