Flow controller

Abstract

The utility model relates to a flow controller, which comprises a circuit board with high-density wiring, a high-performance microprocessor integrated on the circuit board, a high-speed ADC (Analog to Digital Converter) module, a reference voltage source module, a display key module, a communication component, a three-pin flow sensor plugged on the circuit board, and a multi-path power supply processing circuit, in the multi-path power supply processing circuit, a digital 5V circuit is respectively connected with a high-performance microprocessor, a display key module and a communication component through a digital 3.3 V circuit, the digital 5V circuit is connected with a high-speed ADC (Analog to Digital Converter) module through an analog 5V circuit, and a reference voltage source module is connected with the high-speed ADC module; the analog 17V circuit is connected with a power supply pin of the flow sensor through the analog adjustable 10-15V circuit; and the digital 12V circuit is connected with a controlled proportional electromagnetic valve. According to the flow controller, the requirement for an external power supply is lowered, and meanwhile the regulation and control response speed and precision of the proportional valve are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of control, and particularly relates to a flow controller. Background Art

[0002] Since the electromagnetic proportional valve requires relatively precise voltage and is directly connected to the power supply, the fluctuation of the external power supply will directly affect the adjustment accuracy of the proportional valve. Therefore, the existing mass flow controllers require the power supply to be at a fixed value of 24V ± 10% or 12V ± 10%, resulting in the following defects:

[0003] (1) High requirements for the power supply;

[0004] (2) Insufficient control accuracy and slow adjustment control;

[0005] (3) Generally large in volume and heavy in structure. Content of the Utility Model

[0006] The technical problem to be solved by the utility model is to overcome the defects of the existing mass flow controllers, such as high requirements for the power supply, insufficient control accuracy and adjustment speed, etc. A flow controller is provided. By designing a multi-channel power processing circuit to process the power supply for the digital circuit and the ripple of the analog circuit, and cooperating with a high-performance microcontroller to achieve millisecond-level adjustment, the requirements for the external power supply are reduced. At the same time, the control response speed and accuracy for the proportional valve are improved. The control circuit board uses high-density wiring to extremely limit the volume and reduce the processing material cost.

[0007] This flow controller includes a circuit board with high-density wiring, a high-performance microprocessor integrated on the circuit board, a high-speed ADC module, a reference voltage source module, a display button module, and a communication component. A three-pin flow sensor is plugged into the circuit board. Among them, a multi-channel power supply processing circuit is also provided on the circuit board. The multi-channel power supply processing circuit stabilizes the voltage for a total of six DC-DC power supplies, including a digital 5V circuit, a digital 3.3V circuit, a digital 12V circuit, an analog 17V circuit, an analog 5V circuit, and an analog adjustable 10-15V circuit. The digital 5V circuit, the digital 3.3V circuit, the digital 12V circuit, and the analog 17V circuit use MP2456D-LF-Z buck converters. The analog 5V circuit uses an LP2985 low-dropout voltage regulator. The analog adjustable 10-15V circuit uses a TPS7A4701 low-dropout linear regulator. The input terminals of the digital 5V circuit, the analog 17V circuit, and the digital 12V circuit are respectively connected to an external 20-40V power supply. Among them, the digital 5V circuit is connected to the high-performance microprocessor, the display button module, and the communication component through the digital 3.3V circuit. The digital 5V circuit is connected to the high-speed ADC module through the analog 5V circuit. At the same time, the reference voltage source module is connected to the high-speed ADC module. The analog 17V circuit is connected to the power supply pin of the flow sensor through the analog adjustable 10-15V circuit. The digital 12V circuit is connected to a controlled proportional solenoid valve.

[0008] Further, the high-speed ADC module is connected to the high-performance microprocessor. The signal pin of the flow sensor is connected to the signal input terminal of the high-performance microprocessor through the high-speed ADC module. The output terminal of the high-performance microprocessor is connected to the controlled proportional solenoid valve. The high-performance microprocessor is serially connected to the display button module and the communication component.

[0009] Further, the communication component includes a CAN module, an RS485 communication module, an analog switch circuit, and a physical interface. The physical interface is respectively connected to the CAN module and the RS485 communication module through the analog switch circuit. The CAN module and the RS485 communication module are both connected to the serial port of the high-performance microprocessor.

[0010] Further, the high-performance microprocessor uses an AT32F403A processor. The high-speed ADC module uses an ADS1256 analog-to-digital conversion module. The reference voltage source module uses a REF5025 high-precision reference source. The flow sensor uses an AWM43300VH mass flow sensor.

[0011] Further, the circuit board uses a multi-layer board with high-density wiring. The multi-channel power supply processing circuit is arranged in the edge area of the circuit board.

[0012] The flow controller of the present utility model overcomes the defects of the existing mass flow controller, such as high power supply requirements, insufficient control precision and adjustment speed, etc. By designing a multi-channel power supply processing circuit to process the power supply of the digital circuit and the ripple of the analog circuit, and cooperating with a high-performance microcontroller to achieve millisecond-level adjustment, it reduces the requirements for the external power supply, and at the same time improves the control response speed and precision of the proportional valve. The control circuit board uses high-density wiring to extremely restrict the volume and reduce the processing material cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following further describes a flow controller of the present utility model with reference to the drawings:

[0014] Figure 1 It is a block diagram of the logic structure and connection principle of this flow controller;

[0015] Figure 2 It is a circuit diagram of the multi-channel power supply processing circuit of this flow controller;

[0016] Figure 3 It is a circuit diagram of the high-performance processor of this flow controller;

[0017] Figure 4 It is a circuit diagram of the high-speed ADC module, reference voltage source module and flow sensor of this flow controller;

[0018] Figure 5 It is a component wiring diagram of the circuit board of this flow controller.

[0019] In the figure:

[0020] 1 - Circuit board, 2 - High-performance microprocessor, 3 - High-speed ADC module, 4 - Reference voltage source module, 5 - Display key module, 6 - Communication component, 7 - Flow sensor, 8 - Multi-channel power supply processing circuit;

[0021] 61 - CAN module, 62 - RS485 communication module, 63 - Analog switch circuit, 64 - Physical interface; 81 - Digital 5V circuit, 82 - Digital 3.3V circuit, 83 - Digital 12V circuit, 84 - Analog 17V circuit, 85 - Analog 5V circuit, 86 - Analog adjustable 10 - 15V circuit. DETAILED IMPLEMENTATION MANNER

[0022] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a direct connection, or an indirect connection through an intermediate medium, and may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0024] The following further describes the technical solution of the present utility model with specific embodiments, but the protection scope of the present utility model is not limited to the following embodiments.

[0025] Embodiment 1: As Figures 1 to 4As shown in the figure, this flow controller includes a circuit board 1 with high-density wiring, a high-performance microprocessor 2 integrated on the circuit board 1, a high-speed ADC module 3, a reference voltage source module 4, a display button module 5, and a communication component 6. A three-pin flow sensor 7 is plugged into the circuit board 1. Among them, a multi-channel power processing circuit 8 is also provided on the circuit board 1. The multi-channel power processing circuit 8 has a voltage stabilization circuit for a total of six DC-DC power supplies, including a digital 5V circuit 81, a digital 3.3V circuit 82, a digital 12V circuit 83, and an analog 17V circuit 84, an analog 5V circuit 85, and an analog adjustable 10 - 15V circuit 86. The digital 5V circuit 81, the digital 3.3V circuit 82, the digital 12V circuit 83, and the analog 17V circuit 84 use MP2456D-LF-Z buck converters. The analog 5V circuit 85 uses an LP2985 low-dropout voltage regulator, and the analog adjustable 10 - 15V circuit 86 uses a TPS7A4701 low-dropout linear regulator. The three input terminals of the digital 5V circuit 81, the analog 17V circuit 84, and the digital 12V circuit 83 are respectively connected to an external 20 - 40V power supply. Among them, the digital 5V circuit 81 is connected to the high-performance microprocessor 2, the display button module 5, and the communication component 6 through the digital 3.3V circuit 82. The digital 5V circuit 81 is connected to the high-speed ADC module 3 through the analog 5V circuit 85. At the same time, the reference voltage source module 4 is connected to the high-speed ADC module 3. The analog 17V circuit 84 is connected to the power supply pin of the flow sensor 7 through the analog adjustable 10 - 15V circuit 86. The digital 12V circuit 83 is connected to a controlled proportional solenoid valve. It realizes the access of multiple power supply voltages. The digital part and the 17V analog part use MP2456D-LF-Z buck converters. The 5V and adjustable 10 - 15V analog parts respectively use LP2985 and TPS7A4701 low-dropout regulators with low dropout and ultra-low ripple, and the ripple is 4uV, which fully reduces the ripple interference and improves the signal-to-noise ratio. Through the above circuit for DCDC power processing, the requirement for the external power supply is further reduced, and it can be measured that it can work normally from 20V to 45V.

[0026] Embodiment 2: In this flow controller, the high-speed ADC module 3 is connected to the high-performance microprocessor 2. The signal pin of the flow sensor 7 is connected to the signal input terminal of the high-performance microprocessor 2 through the high-speed ADC module 3. The output terminal of the high-performance microprocessor 2 is connected to a controlled proportional solenoid valve. The high-performance microprocessor 2 is serially connected to the display button module 5 and the communication component 6. The remaining structures and components are as described in Embodiment 1 and will not be repeated here.

[0027] Embodiment 3: In this flow controller, the communication component 6 includes a CAN module 61, an RS485 communication module 62, an analog switch circuit 63, and a physical interface 64. The physical interface 64 is respectively connected to the CAN module 61 and the RS485 communication module 62 through the analog switch circuit 63. Both the CAN module 61 and the RS485 communication module 62 are connected to the serial port of the high-performance microprocessor 2. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0028] Embodiment 4: As Figure 3 , 4 shown, in this flow controller, the high-performance microprocessor 2 uses an AT32F403A processor; the high-speed ADC module 3 uses an ADS1256 analog-to-digital conversion module, and the reference voltage source module 4 uses a REF5025 high-precision reference source; the flow sensor 7 uses an AWM43300VH mass flow sensor. The AT32F403A is a -bit CPU, which can perform efficient and high-speed signal processing and instruction output under low power consumption. The parameters of the ADS1256 are 30KSPS and 24Bit; the standard grade of the REF5025 is 0.1% maximum and 8ppm / °C, and the low-noise grade is 3μVPP / V. Cooperating with the high-precision microprocessor, it realizes signal regulation in milliseconds. The flow sensor 5 uses an AWM43300VH mass flow sensor. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0029] Embodiment 5: As Figure 5 shown, the circuit board 1 of this flow controller uses a multi-layer board with high-density wiring, and the multi-channel power processing circuit 8 is arranged in the edge area of the circuit board. Since the multi-channel power processing circuit is prone to emitting interference signals, by arranging it on the edge and cooperating with a fully enclosed inductor, the emission of radiation signals is reduced; a multi-layer PCB is used, and copper plating is used for isolation under the power supply, holes are drilled and sealed at the edge, and the entire PCB uses global copper plating as the ground, thereby ensuring a good signal return path and good grounding of analog signals, realizing the shortest propagation path, and improving the signal transmission efficiency. The remaining structures and components are as described in Embodiment 1 and will not be repeated. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0030] This flow controller processes the power supply for digital circuits and the ripple of analog circuits by designing a multi-channel power processing circuit, and cooperates with a high-performance microcontroller to achieve regulation in milliseconds, reducing the requirements for external power supplies. At the same time, it improves the control response speed and accuracy of the proportional valve. The control circuit board uses high-density wiring, extremely constraining the volume and reducing the processing material cost.

[0031] The above description shows the main features, basic principles, and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments or examples, and can be implemented in other specific forms without departing from the spirit or basic features of the present utility model. Therefore, the above-described embodiments or examples should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0032] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flow controller, characterized in that: The invention comprises a circuit board (1) with high-density wiring, a high-performance microprocessor (2), a high-speed ADC module (3), a reference voltage source module (4), a display key module (5) and a communication component (6) integrated on the circuit board (1), and a three-pin flow sensor (7) plugged into the circuit board (1), wherein the circuit board (1) is also provided with a multi-channel power supply processing circuit (8). The multi-channel power supply processing circuit (8) has a total of six DC-DC power supply voltage stabilization circuits, including a digital 5V circuit (81), a digital 3.3V circuit (82), a digital 12V circuit (83), an analog 17V circuit (84), an analog 5V circuit (85), and an analog adjustable 10-15V circuit (86); the digital 5V circuit (81), the digital 3.3V circuit (82), the digital 12V circuit (83), and the analog 17V circuit (84) use an MP2456D-LF-Z step-down converter, the analog 5V circuit (85) uses an LP2985 low voltage dropout regulator, and the analog adjustable 10-15V circuit (86) uses a TPS7A4701 low voltage linear regulator; The three input ends of the digital 5V circuit (81), the analog 17V circuit (84) and the digital 12V circuit (83) are respectively connected to an external 20-40V power supply, wherein the digital 5V circuit (81) is respectively connected to a high-performance microprocessor (2), a display key module (5) and a communication component (6) via a digital 3.3V circuit (82); the digital 5V circuit (81) is connected to a high-speed ADC module (3) via an analog 5V circuit (85), and the reference voltage source module (4) is connected to the high-speed ADC module (3); the analog 17V circuit (84) is connected to a power supply pin of a flow sensor (7) via an analog adjustable 10-15V circuit (86); and the digital 12V circuit (83) is connected to a controlled proportional solenoid valve.

2. The flow controller according to claim 1, characterized in that: The high-speed ADC module (3) is connected to a high-performance microprocessor (2); the signal pin of the flow sensor (7) is connected to the signal input end of the high-performance microprocessor (2) via the high-speed ADC module (3); the output end of the high-performance microprocessor (2) is connected to a controlled proportional solenoid valve; and the high-performance microprocessor (2) is serially connected to the display key module (5) and the communication component (6).

3. The flow controller according to claim 2, characterized in that: The communication component (6) comprises a CAN module (61), an RS485 communication module (62), an analog switch circuit (63) and a physical interface (64); the physical interface (64) is respectively connected to the CAN module (61) and the RS485 communication module (62) via the analog switch circuit (63); and the CAN module (61) and the RS485 communication module (62) are both connected to the serial port of the high-performance microprocessor (2).

4. The flow controller according to claim 3 is characterized in that: The high-performance microprocessor (2) adopts an AT32F403A processor; the high-speed ADC module (3) adopts an ADS1256 analog-to-digital conversion module; the reference voltage source module (4) adopts a REF5025 high-precision reference source; and the flow sensor (7) adopts an AWM43300VH mass flow sensor.

5. The flow controller according to any one of claims 1 to 4, characterized in that: The circuit board (1) is a multi-layer board with high-density wiring, and the multi-channel power supply processing circuit (8) is arranged in the edge area of ​​the circuit board.

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