Pressure detection circuit, fluid system and sequencing system

Abstract

The utility model relates to a pressure detection circuit, a fluid circuit system and a sequencing system. The pressure detection circuit includes: a pressure detection module for detecting pressure and sending a pressure signal to a main control module; a main control module for receiving and outputting a pressure signal; a first communication module and a second communication module respectively connected to the main control module; wherein the first communication module or the second communication module is connected to an adapter device, the first communication module or the second communication module receives the pressure signal sent by the main control module and sends the pressure signal to the adapter device; or the first communication module and the second communication module are respectively connected to the first adapter device and the second adapter device, the first communication module and the second communication module receive the pressure signal sent by the main control module and send the pressure signal to the first adapter device and the second adapter device respectively. The pressure detection circuit of the utility model can communicate with different adapter devices through different communication modules.

Description

Technical Field

[0001] The utility model relates to the detection field, in particular to a pressure detection circuit, a liquid circuit system and a sequencing system. Background Art

[0002] Pressure detection circuits are widely used. Different pressure sensors can be configured to detect a variety of pressures, such as liquid pressure, gas pressure, etc. After the pressure detection circuit detects the pressure, it will send the pressure signal to the subsequent device, which can be a host computer or processor, etc., and the host computer or processor will perform subsequent processing on the pressure data.

[0003] The existing pressure detection circuit usually has only one communication mode, and can communicate with the subsequent device only when it matches the communication mode between the subsequent device, such as the host computer or the processor. If the transmission of the pressure detection circuit and the subsequent device does not match, for example, the pressure detection circuit uses I2C communication, and the subsequent device uses CAN communication, or the pressure detection circuit uses CAN communication, and the subsequent device uses I2C communication, the pressure detection circuit and the subsequent device cannot achieve effective communication.

[0004] It can be seen that the existing pressure detection circuit only has a single communication method, has a small application scenario, and cannot meet the needs of users. Utility Model Content

[0005] In order to solve the above technical problem or at least partially solve the above technical problem, the utility model provides a pressure detection circuit that can communicate with different adapter devices through different communication modules.

[0006] In a first aspect, the utility model provides a pressure detection circuit, the pressure detection circuit comprising:

[0007] A pressure detection module is used to detect pressure and send a pressure signal to a main control module;

[0008] A main control module, used for receiving and outputting pressure signals;

[0009] A first communication module and a second communication module respectively connected to the main control module;

[0010] Among them, a first communication module or a second communication module is set to be connected to the adapter device, and the first communication module or the second communication module receives the pressure signal sent by the main control module and sends the pressure signal to the adapter device; or, the adapter device includes a first adapter device and a second adapter device, and the first communication module and the second communication module are set to be connected to the first adapter device and the second adapter device respectively, and the first communication module and the second communication module receive the pressure signal sent by the main control module and send the pressure signal to the first adapter device and the second adapter device respectively.

[0011] In an embodiment of the utility model, the first communication module is a communication interface module, which is used to receive the pressure signal sent by the main control module and send the pressure signal to the external communication module, and the external communication module then sends the pressure signal to the adapter device;

[0012] Optionally, the communication interface module is an I2C communication interface module, and the second communication module is a CAN communication module.

[0013] In an embodiment of the present utility model, the main control module includes:

[0014] MCU unit;

[0015] An identification unit connected to the MCU unit is used to identify the main control module in the CAN bus to identify the pressure detection circuit where the main control module is located;

[0016] Optionally, the main control module further includes a first signal input unit connected to the MCU unit, and the first signal input unit is used to receive the pressure signal sent by the pressure detection module;

[0017] Optionally, the main control module further comprises a status indication unit connected to the MCU unit, and the status indication unit is used to indicate the status of the main control module;

[0018] Optionally, the main control module further comprises a burning unit connected to the MCU unit, the burning unit being used to receive a burning signal and burn the main control module according to the burning signal;

[0019] Optionally, the main control module further includes a crystal oscillator unit connected to the MCU unit, and the crystal oscillator unit is used to provide a clock signal required by the main control module.

[0020] In an embodiment of the present utility model, the CAN communication module comprises:

[0021] A second signal input unit is connected to the main control module and is used to receive a first signal sent by the main control module, where the first signal includes a pressure signal;

[0022] a transceiver unit connected to the second signal input unit and configured to convert the first signal into a second signal, the second signal being adapted to be transmitted on the CAN bus;

[0023] A bus interface unit, connected to the transceiver unit, and configured to output the second signal to the CAN bus;

[0024] Optionally, the CAN communication module further comprises a power interface unit connected to an external power source for supplying power to the CAN communication module;

[0025] Optionally, the CAN communication module further comprises a first filtering unit, a first end of which is respectively connected to the transceiver unit and the power interface unit, and a second end of which is grounded, for filtering out interference signals in the power supply signal;

[0026] Optionally, the CAN communication module further comprises: a second filtering unit, the bus interface unit is connected to the transceiver unit through the second filtering unit, the second filtering unit is used to filter out interference signals in the CAN communication module, wherein a first end of the second filtering unit is connected to a first output end of the transceiver unit, and a second end of the second filtering unit is connected to a second output end of the transceiver unit;

[0027] Optionally, the CAN communication module further comprises a protection unit connected to the bus interface unit and used for protecting the CAN communication module;

[0028] Optionally, the CAN communication module further includes an impedance matching unit connected to the selection unit, and configured to reduce reflection interference of the signal after the CAN communication module is connected.

[0029] Optionally, the CAN communication module further comprises a selection unit for selecting whether to connect the impedance matching unit to the CAN communication module;

[0030] Optionally, the first filtering unit comprises:

[0031] A first capacitor group, the first capacitor group includes at least two capacitors connected in parallel, a first end of the first capacitor group is connected to a power input end of the transceiver unit, and a second end of the first capacitor group is grounded;

[0032] Optionally, the second filtering unit includes a common mode inductor, a first end of the common mode inductor is connected to the first output end of the transceiver unit, and a second end of the common mode inductor is connected to the second output end of the transceiver unit;

[0033] Optionally, the protection unit comprises:

[0034] A transient voltage suppression diode, wherein a first end of the transient voltage suppression diode is connected to the third end of the common mode inductor, a second end of the transient voltage suppression diode is connected to the fourth end of the common mode inductor, and a third end of the transient voltage suppression diode is grounded.

[0035] In an embodiment of the utility model, the pressure detection circuit further includes:

[0036] a power supply module, connected to the external power supply and the main control module respectively, for converting a first voltage of the external power supply into a second voltage, and supplying power to the main control module according to the second voltage;

[0037] Optionally, the power supply module comprises:

[0038] A front-end filtering unit, used for filtering out interference in the first voltage;

[0039] A voltage conversion module, connected to the front-end filter unit, for converting the first voltage after interference is filtered out into a second voltage;

[0040] A back-end filtering unit, connected to the voltage conversion module, for filtering out interference in the second voltage;

[0041] Optionally, the power supply module further comprises a separation unit, a first end of which is connected to the digital ground and a second end of which is connected to the analog ground, for separating the digital ground from the analog ground;

[0042] Optionally, the front-end filtering unit comprises:

[0043] A bidirectional transient voltage suppressor tube, a first end of which is grounded, and a second end of which is connected to the positive electrode of an external power supply;

[0044] A second capacitor group includes a plurality of capacitors connected in parallel, wherein a first end of the second capacitor group is connected to a second end of the bidirectional transient voltage suppressor, a first end of the second capacitor group is also connected to an input end of the voltage conversion module, and a second end of the second capacitor group is grounded;

[0045] Optionally, the back-end filtering unit comprises:

[0046] The third capacitor group includes at least two capacitors connected in parallel, a first end of the third capacitor group is connected to the output end of the voltage conversion module, and a second end is grounded.

[0047] In an embodiment of the utility model, the pressure detection circuit further includes:

[0048] A signal amplification module, connected to the pressure detection module, and used to amplify the pressure signal from the pressure detection module;

[0049] Optionally, the signal amplification module comprises:

[0050] A third signal input unit, connected to the pressure detection module, for receiving a pressure signal from the pressure detection module;

[0051] an amplifying unit, used for amplifying a pressure signal;

[0052] The signal output unit is used to output the amplified pressure signal.

[0053] Optionally, the pressure detection circuit further comprises:

[0054] The reference voltage module is used to provide a reference voltage to the signal amplification module.

[0055] In a second aspect, a fluid circuit system is provided, comprising a first fluid circuit component and a pressure detection circuit as described above, wherein the first fluid circuit component comprises a first storage device, a first rotary valve, a first reaction device and a first pump component, wherein the first pump component drives the liquid in the first storage device to enter the first reaction device through the first rotary valve, and the pressure detection module comprises a first pressure sensor, and the first pressure sensor is used to detect the fluid circuit pressure between the first reaction device and the first pump component.

[0056] In an embodiment of the utility model, the liquid circuit system also includes a second liquid circuit component, the second liquid circuit component includes a second storage device, a second rotary valve, a second reaction device and a second pump component, the second pump component drives the liquid in the second storage device into the second reaction device through the second rotary valve, and the pressure detection module also includes a second pressure sensor, which is used to detect the liquid circuit pressure between the second reaction device and the second pump component.

[0057] In an embodiment of the utility model, the first liquid circuit assembly further includes a first three-way valve, which is arranged between the first rotary valve and the first reaction device, and includes a first port, a second port and a third port, the first port is connected to the first rotary valve, the second port is connected to the first reaction device, and the third port is connected to the first pump assembly, and the first pump assembly drives the liquid in the first storage device to enter the first branch between the first three-way valve and the first pump assembly through the first rotary valve and the first three-way valve;

[0058] The second liquid circuit assembly also includes a second three-way valve, which is arranged between the second rotary valve and the second reaction device, and includes a fourth port, a fifth port and a sixth port, the fourth port is connected to the second rotary valve, the fifth port is connected to the second reaction device, and the sixth port is connected to the second pump assembly, and the second pump assembly drives the liquid in the second storage to enter the second branch between the second three-way valve and the second pump assembly through the second rotary valve and the second three-way valve;

[0059] There are two pressure detection circuits, one of which is a first pressure detection circuit, and the other is a second pressure detection circuit. The pressure detection module of the first pressure detection circuit includes a first pressure sensor and a second pressure sensor, and the pressure detection module of the second pressure detection circuit includes a third pressure sensor and a fourth pressure sensor. The third pressure sensor is used to detect the pressure of the first branch, and the fourth pressure sensor is used to detect the pressure of the second branch.

[0060] In a third aspect, a sequencing system is provided, the sequencing system comprising the pressure detection circuit as described above; or comprising the liquid circuit system as described above.

[0061] The embodiment of the utility model provides a pressure detection circuit, including: a pressure detection module, a main control module, a first communication module and a second communication module. When in a scenario where an adapter device needs to communicate with the first communication module, the first communication module is set to communicate with the adapter device; when in a scenario where an adapter device needs to communicate with the second communication module, the second communication module is set to communicate with the adapter device; when in a scenario where an adapter device needs to communicate with both the first communication module and the second communication module, for example, multiple adapter devices meet multiple communication methods, the first communication module is set to communicate with the first adapter device, and the second communication module is set to communicate with the second adapter device. The pressure detection circuit of the embodiment of the utility model can communicate with different adapter devices, has a wide range of applications, and can meet the different needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0064] Figure 1 Shown is a schematic diagram of the structure of the pressure detection circuit of the utility model;

[0065] Figure 2 Shown is a circuit diagram of the communication interface module of the utility model;

[0066] Figure 3 Shown is a schematic diagram of the structure of the main control module of the utility model;

[0067] Figure 4 Shown is a circuit diagram of some units of the main control module of the utility model;

[0068] Figure 5 Shown is a circuit diagram of the identification unit of the utility model;

[0069] Figure 6 Shown is a circuit diagram of the status indication unit of the utility model;

[0070] Figure 7 Shown is a circuit diagram of the programming unit of the utility model;

[0071] Figure 8 The circuit diagram of the crystal oscillator unit of the utility model is shown as follows

[0072] Fig. 9 Shown is a schematic diagram of the CAN communication module structure of the utility model;

[0073] Fig.10 Shown is a circuit diagram of the CAN communication module of the utility model;

[0074] Fig.11 Shown is a schematic structural diagram of a power supply module of the utility model;

[0075] Fig.12 Shown is a circuit diagram of the power supply module of the utility model;

[0076] Fig.13 The figure shows a schematic diagram of the structure of the signal amplification module in the pressure detection circuit of the utility model;

[0077] Fig.14 Shown is a circuit diagram of a signal amplification module in a pressure detection circuit of the utility model;

[0078] Fig.15 Shown is a circuit schematic diagram of a reference voltage module in a voltage detection circuit of the utility model;

[0079] Fig.16 Shown is a schematic diagram of a fluid circuit system for detecting the pressure of a fluid circuit of the utility model;

[0080] Fig.17 Shown is a schematic diagram of a fluid circuit system for detecting pressures of two fluid circuits of the utility model;

[0081] Fig.18 Shown is a schematic diagram of a fluid circuit system for detecting pressures of four fluid circuits of the present invention. DETAILED DESCRIPTION

[0082] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0083] Figure 1 Shown is a schematic structural diagram of the pressure detection circuit of the utility model.

[0084] like Figure 1 As shown, a pressure detection circuit provided by an embodiment of the utility model includes:

[0085] The pressure detection module 110 is used to detect the pressure and send the pressure signal to the main control module 120;

[0086] A main control module 120, used to receive and output a pressure signal;

[0087] A first communication module 170 and a second communication module 130 respectively connected to the main control module;

[0088] Among them, the first communication module 170 or the second communication module 130 is set to be connected to the adapter device, the first communication module 170 or the second communication module 130 receives the pressure signal sent by the main control module and sends the pressure signal to the adapter device; or, the adapter device includes a first adapter device and a second adapter device, and the first communication module 170 and the second communication module 130 are set to be connected to the first adapter device and the second adapter device respectively, the first communication module 170 and the second communication module 130 receive the pressure signal sent by the main control module and send the pressure signal to the first adapter device and the second adapter device respectively.

[0089] In the embodiment of the utility model, setting the communication module to be connected to the adapter device refers to connecting the communication module to the adapter device through an interface, electrical connection, connector, other functional modules, or other methods in the prior art.

[0090] In the embodiment of the utility model, the first communication module 170 can be connected and communicated with an adapter device of the same communication mode that is consistent with / matched / adapted to its communication mode, and the second communication module 130 can be connected and communicated with an adapter device of the same communication mode that is consistent with / matched / adapted to its communication mode. For example, if the first communication module 170 is an I2C communication module, the first communication module 170 can be connected to an IC2 adapter device and communicate using the IC2 communication mode, and if the second communication module 130 is a CAN communication module, the second communication module 130 can be connected to a CAN adapter device and communicate using the CAN communication mode.

[0091] In an embodiment of the present application, the pressure value of the object under test detected by the pressure detection module 110 in the pressure detection circuit is output in the form of a pressure signal. The main control module 120 receives the pressure signal, and the first communication module 170 can be set to be connected to the adapter device, and the pressure detection circuit sends the pressure signal through the first communication module 170. The main control module 120 receives the pressure signal, and the second communication module 130 can also be set to be connected to the adapter device, and the pressure detection circuit sends the pressure signal through the second communication module 130. In another embodiment of the present application, the adapter device includes a first adapter device and a second adapter device, and the first communication module 170 can be set to be connected to the first adapter device, and the second communication module 130 can be connected to the second adapter device, then the pressure detection circuit can send the pressure signal to the first adapter device through the first communication module 170, and send the pressure signal to the second adapter device through the second communication module 130.

[0092] In actual applications, although the first communication module 170 and the second communication module 130 can both be connected to corresponding adapter devices, if the pressure detection circuit detects only one pressure signal, it only sends the pressure signal to one adapter device. If the pressure detection circuit detects multiple pressure signals, different pressure signals can be sent to different adapter devices.

[0093] In the pressure detection circuit of the embodiment of the utility model, the first communication module 170 is a communication interface module, which is used to receive the pressure signal sent by the main control module 120 and send the pressure signal to the external communication module, and the external communication module then sends the pressure signal to the adapter device. In this way, the components constituting the first communication module 170 are relatively few, which can reduce the occupied space in the pressure detection circuit, making the layout design of the pressure detection circuit more reasonable.

[0094] Of course, in one embodiment of the utility model, the first communication module 170 can also be an internal communication module, which can directly send the pressure signal to the adapter device. In another embodiment of the utility model, the first communication module 170 includes a communication interface module and an internal communication module, and the pressure signal is sent to the internal communication module through the communication interface module, and sent to the adapter device by the internal communication module. In the above embodiment where a communication module is provided inside the pressure detection circuit, the communication between the pressure detection circuit and the adapter device can be realized without additionally configuring a communication module in the system, and other circuits in the system can be reduced, making the system composition simpler.

[0095] The embodiment of the utility model provides a pressure detection circuit, which includes: a pressure detection module 110, a main control module 120, a first communication module 170 and a second communication module 130. The first communication module 170 can be connected and communicated with an adapter device of the same communication mode that conforms to / matches / adapts to its communication mode, and the second communication module 130 can be connected and communicated with an adapter device of the same communication mode that conforms to / matches / adapts to its communication mode, so that the pressure detection circuit can communicate with different adapter devices, which solves the problem that the pressure detection circuit in the prior art can only communicate using a single communication mode, so that the pressure detection circuit of the utility model has a wide range of applications and can meet the different needs of users.

[0096] In the pressure detection circuit in the embodiment of the utility model, the communication interface module is an I2C communication interface module 1710 , and the second communication module 130 is a CAN communication module 1300 .

[0097] In an embodiment of the present utility model, the first communication module 170 and the second communication module 130 can be configured as different communication modes. For example, the first communication module 170 is an I2C communication interface module 1710, and the second communication module 130 is a CAN communication module 1300. Both communication modes can communicate with the adapter device.

[0098] like Figure 2 As shown, the connector J2 may be an I2C interface, through which communication with other external adapter devices having an I2C communication function may be performed.

[0099] The connector J2 includes 4 ports, port 1 is connected to the power supply; port 2 and port 3 are communication ports, respectively connected to pin 21 and pin 22 of the MCU unit 122, for transmitting the signal from the MCU unit 122 to the adapter device in I2C mode; port 4 is grounded. In the embodiment of the utility model, unless otherwise specified, grounding refers to digital grounding.

[0100] The communication interface module also includes a resistor R18, a resistor R19, and a capacitor C17. One end of the resistor R19 is connected to a 5V power supply, and the other end is connected to port 2 of the connector J2. One end of the resistor R18 is connected to a 5V power supply, and the other end is connected to port 3 of the connector J2. One end of the capacitor C17 is connected to a 5V power supply, and the other end is grounded.

[0101] like Figure 2 As shown, capacitor C17 is a filter capacitor, which can reduce interference. Resistors R18 and R19 are pull-up resistors, which are connected to pin No. 21 and pin No. 22 of MCU unit 122 to provide pull-up level.

[0102] The above-mentioned MCU unit 122 is the MCU unit 122 in the main control module 120, and its structure, function, etc. will be described below.

[0103] In the practical embodiment of the present invention, the first communication module 170 can be an I2C communication interface module 1710, and the second communication module can be a CAN communication module 1300. Therefore, the pressure detection circuit of the embodiment of the present invention has the ability to communicate with the CAN communication device and the I2C communication device, and can select which communication module to communicate through according to the connected adapter device. For example, if the I2C communication device is connected, then the communication is through the I2C communication interface module 1710. When both adapter devices are connected at the same time, the pressure signal can select a communication module for communication. When both adapter devices are connected at the same time, and there are multiple pressure signals at the same time, each pressure signal can select a communication module for communication. For example, pressure signal A is sent to the I2C communication device through the I2C communication interface module 1710, and pressure signal B is sent to the CAN communication device through the CAN communication module 1300.

[0104] like Figure 1 As shown, the pressure detection circuit includes the above pressure detection module 110, the main control module 120, the first communication module 170, the second communication module 130, and also includes a power supply module 140, a signal amplification module 150 and a reference voltage module 160.

[0105] The power supply module 140 is connected to the external power supply and the main control module 120 respectively, and is used to convert a first voltage of the external power supply into a second voltage, and supply power to the main control module 120 according to the second voltage.

[0106] The signal amplifying module 150 is connected to the pressure detecting module 110 and is used to amplify the pressure signal from the pressure detecting module 110 .

[0107] The reference voltage module 160 is used to provide a reference voltage to the signal amplification module 150 .

[0108] In the embodiment of the utility model, the pressure detection module 110 detects the pressure and outputs the pressure signal. The pressure signal is amplified by the signal amplification module 150 and then transmitted to the main control module 120, and the main control module 120 outputs the pressure signal. The main control module 120 can communicate with the adapter device using the I2C communication method to output the pressure signal; or can communicate with the adapter device using the CAN communication method to output the pressure signal; or can communicate with the I2C communication device using the I2C communication method to output one pressure signal, and also communicate with the CAN adapter device using the CAN communication method to output another pressure signal. In this process, the reference voltage module 160 provides a reference voltage to the signal amplification module 150, and the power supply module 140 supplies power to the main control module 120.

[0109] The structure and function of each module of the pressure detection circuit are described in detail below.

[0110] The pressure detection module 110 of the embodiment of the utility model can be various types of pressure detectors, such as a liquid pressure detector, a gas pressure detector, a solid pressure detector, etc., and can be configured according to the pressure to be detected, which will not be repeated here.

[0111] like Figure 3 As shown, the main control module 120 includes:

[0112] MCU unit 122;

[0113] The identification unit 123 connected to the MCU unit 122 is used to identify the main control module 120 in the CAN bus to identify the pressure detection circuit where the main control module 120 is located.

[0114] In some achievable implementations of the present utility model, the main control module 120 further includes a first signal input unit 124 connected to the MCU unit 122, and the first signal input unit 124 is used to receive the pressure signal sent by the pressure detection module 110;

[0115] In some achievable embodiments of the present invention, the main control module 120 further includes a status indication unit 125 connected to the MCU unit 122, and the status indication unit 125 is used to indicate the status of the main control module 120;

[0116] In some achievable embodiments of the present invention, the main control module 120 further includes a burning unit 126 connected to the MCU unit 122, and the burning unit 126 is used to receive a burning signal and burn the main control module 120 according to the burning signal;

[0117] In some achievable implementations of the present invention, the main control module 120 further includes a crystal oscillator unit 127 connected to the MCU unit 122 , and the crystal oscillator unit 127 is used to provide a clock signal required by the main control module 120 .

[0118] Figure 4 FIG. 1 is a circuit diagram of the main control module 120 of the present invention.

[0119] The main control module 120 includes an MCU unit 122. In the embodiment of the utility model, the MCU includes a plurality of pins.

[0120] The first signal input unit 124 includes a resistor R8 and a capacitor C20, wherein one end of the resistor R8 is connected to the signal amplification module 150, and the other end is connected to the 16th pin of the MCU unit 122. One end of the capacitor C20 is connected to the 16th pin of the MCU unit 122, and the other end is grounded.

[0121] The utility model Figure 4 In the illustrated embodiment, two amplified pressure signals Pre_AD1 and Pre_AD2 are connected, respectively connected to the 16th pin and the 17th pin of the MCU unit 122. In other embodiments of the utility model, more amplified pressure signals can be connected according to the function and the number of pins of the MCU unit 122; or only one amplified pressure signal can be connected, for example, only the amplified pressure signal Pre_AD1 or only the amplified pressure signal Pre_AD2.

[0122] When two amplified pressure signals are connected, the first signal input unit 124 further includes a resistor R9 and a capacitor C22, wherein one end of the resistor R9 is connected to the other amplified pressure signal Pre_AD2, and the other end is connected to the No. 17 pin of the MCU unit 122. One end of the capacitor C22 is connected to the No. 17 pin of the MCU unit 122, and the other end is grounded.

[0123] Pin No. 32 and Pin No. 33 of the MCU unit 122 are used to communicate with the CAN communication module, and the two pins are one for sending and one for receiving.

[0124] Pin No. 41, Pin No. 42 and Pin No. 43 of the MCU unit 122 are used to receive an identification signal sent by the identification unit 123, such as an identification ID.

[0125] Pin No. 21 and Pin No. 22 of the MCU unit 122 are connected to the communication interface module and can communicate with the adapter device via I2C, with one pin for sending and one pin for receiving.

[0126] Pin No. 28 of the MCU unit 122 is connected to the status indication unit 125, and can control the display of the status indication unit 125 to display the status of the pressure detection circuit.

[0127] Pin No. 7, Pin No. 34 and Pin No. 37 of the MCU unit 122 are respectively connected to the programming unit 126 for communicating with the programming unit 126, for example, for receiving programming signals.

[0128] Pin No. 5 of the MCU unit 122 is connected to the crystal oscillator unit 127 for receiving a clock signal.

[0129] Pin No. 2, pin No. 3 and pin No. 44 of the MCU unit 122 are grounded through resistors R12, R15 and R13, respectively.

[0130] Figure 5 FIG. 1 is a schematic diagram of a circuit of the identification unit 123 of the present invention. Figure 5As shown, the identification unit 123 can be a three-position dip switch SW1. By adjusting the three-position dip switch SW1, the identification information of the identification unit 123 can be set, so as to identify the pressure detection circuit of the present invention after connecting to the CAN bus.

[0131] The identification unit 123 further includes resistors R33, R34 and R35. Ports 6, 5 and 4 of the three-position dial switch SW1 are connected to the 3.3V power supply through resistors R33, R34 and R35 respectively, and ports 1, 2 and 3 of the three-position dial switch SW1 are grounded.

[0132] Ports 6, 5, and 4 of the three-position dip switch SW1 are also connected to pins 41, 42, and 43 of the MCU unit 122, respectively, for sending the set identification information to the MCU unit 122.

[0133] Figure 6 FIG. 1 is a circuit diagram of the state indicating unit 125 of the present invention. The state indicating unit 125 may use a light emitting diode D1 as an indicator light.

[0134] The state indicating unit 125 further includes a resistor R7 , a transistor Q1 , and a resistor R10 .

[0135] The anode of the light-emitting diode D1 is connected to the 3.3V power supply through the resistor R7, the cathode of the light-emitting diode D1 is connected to the third end of the transistor Q1, the first end of the transistor Q1 is connected to the 28th pin of the MCU unit 122 through the resistor R10, and the second end of the transistor Q1 is grounded.

[0136] Figure 7 The circuit diagram of the programming unit 126 of the present invention is shown, wherein J4 can also be called a programming debugging interface. The programming debugging interface J4 can be connected to other devices with programming functions, receive programming signals, and program the main control module 120 according to the programming signals.

[0137] The burning unit 126 includes a burning debugging interface J4, a capacitor C16, a resistor R14, a resistor R16 and a resistor R17. Port 1 of the burning debugging interface J4 is connected to the 7th pin of the MCU unit 122, and port 1 of the burning debugging interface J4 is also grounded through capacitor C16. Port 2 of the burning debugging interface J4 is grounded through R16, port 3 of the burning debugging interface J4 is connected to a 3.3V power supply through R17, port 4 of the burning debugging interface J4 is directly grounded, and port 5 of the burning debugging interface J4 is directly connected to a 3.3V power supply. One end of the resistor R14 is connected to the 3.3V power supply, and one end is grounded through capacitor C16.

[0138] Port 2 and port 3 of the burning and debugging interface J4 are also connected to pin 34 and pin 37 of the MCU unit 122 respectively, so as to send the burning signal to the main control module 120 .

[0139] In the embodiment of the utility model, the burning unit 126 can also receive a reset signal, and send the reset signal RESET to the seventh pin of the MCU unit 122 to reset the MCU unit 122 .

[0140] Figure 8 FIG. 1 is a circuit diagram of the crystal oscillator unit 127 of the present invention. Figure 8 As shown, the crystal oscillator unit 127 includes: a high-speed crystal oscillator Y1 for generating a periodic clock signal; the crystal oscillator unit 127 also includes a resistor R6, a capacitor C13 and a capacitor C14.

[0141] Pin 2 of the high-speed crystal oscillator Y1 is grounded, pin 3 of the high-speed crystal oscillator Y1 is connected to pin 5 of the MCU unit 122 through resistor R6, pin 4 of the high-speed crystal oscillator Y1 is connected to a 3.3V power supply, and pin 4 of the high-speed crystal oscillator Y1 is also grounded through capacitor C13, and pin 1 of the high-speed crystal oscillator Y1 is left floating.

[0142] refer to Figures 3 to 8 As shown, when the main control module 120 is working, the MCU unit 122 receives the amplified pressure signal Pre_AD1 from the 16th pin. The resistor R8 and the capacitor C20 form an RC filter circuit, which is used to filter out other unnecessary signals in the input signal, i.e., the amplified pressure signal Pre_AD1. The resistors R12, R15, and R13 connected to the MCU unit 122 are pull-down resistors, which are used to provide a low level to the 2nd pin, the 3rd pin, and the 44th pin of the MCU unit 122.

[0143] When the MCU unit 122 is working, in the identification unit 123, ports 6, 5, and 4 of the three-position dial switch SW1 are connected to the power supply through resistors R33, R34, and R35, and ports 6, 5, and 4 of the three-position dial switch SW1 are also connected to the main control module at the same time. Resistors R33, R34, and R35 are pull-up resistors, and ports 1, 2, and 3 of the three-position dial switch SW1 are grounded. By controlling the dialing of the three-position dial switch SW1, the port corresponding to the three-position dial switch SW1 can be controlled to output a high level or a low level to the main control module, thereby achieving the role of identity recognition. Specifically, when a certain dial in the three-position dial switch SW1 does not choose to be grounded, the port corresponding to the ungrounded dial provides a high level to the MCU unit 122, and when a certain dial in the three-position dial switch SW1 chooses to be grounded, the port corresponding to the grounded dial provides a low level to the MCU unit 122.

[0144] In one application scenario of the present invention, multiple devices can be connected to the CAN bus, and the pressure detection circuit of the present invention uses the identification unit 123 to identify itself to distinguish it from other devices connected to the CAN bus. In another application scenario, multiple pressure detection circuits of the present invention are connected to the CAN bus, and different pressure detection circuits are identified according to the identification unit 123 in the main control module 120. In other embodiments of the present utility model, the identification unit 123 can also be other modules with the same or similar functions.

[0145] When the main control module 120 is working, it can control the status indication unit 125 to light up or turn off according to a preset mode, such as periodically turning on and off, or keeping it on or off for a long time.

[0146] The status indicating unit 125 may be a status indicator light. The status of the main control module 120 may include normal operation, abnormality, no power, etc. In normal operation, the status indicator light may be a light that flashes at a fixed frequency, such as a light that flashes at a frequency of 1S; in abnormal operation, the light may be long on; in no power, the light may be long off. In other embodiments of the utility model, the status indicating unit 125 may also be an LED display screen that displays different states through different numbers or a combination of different numbers.

[0147] In the status indication unit 125, the input current of the base of the transistor Q1 can be controlled by the main control module 120 outputting high and low levels to control the on and off of the transistor Q1. The transistor Q1 controls the power supply circuit of the light-emitting diode D1, so by controlling the on and off of the transistor Q1, the light-emitting diode D1 can be controlled to be on or off. Specifically, when the main control module 120 outputs a high level, the transistor Q1 is turned on and the light-emitting diode D1 is on; when the main control module 120 outputs a low level, the transistor Q1 is turned off and the light-emitting diode D1 is off.

[0148] In the state indicating unit 125, transistor resistor R10 is a current limiting resistor of the base of transistor Q1, which can limit the input current of the base of transistor Q1 to be enough to fully turn on transistor Q1 and will not burn transistor Q1 due to excessive current. Resistor R7 is a current limiting resistor of light-emitting diode D1, which can limit the current flowing into light-emitting diode D1 to prevent light-emitting diode D1 from burning.

[0149] When the main control module 120 is working, in the burning unit 126, the burning debugging interface J4 can adopt a 1.25 spacing 5PIN socket, and the No. 1 port of the burning debugging interface J4 is connected to the No. 7 pin of the MCU unit 122, and the reset signal is connected. The resistor R14 is a pull-up resistor, and the capacitor C16 is a filter capacitor, which can play a role in reducing interference. In addition, the capacitor C16 can also be used to output a low level to reset the MCU unit 122. The resistor R17 is a pull-up resistor, which provides a high level to the No. 34 pin of the MCU unit 122, that is, the burning data interface. R16 is a pull-down resistor, which provides a low level to the No. 37 pin of the MCU unit 122, that is, the burning clock interface.

[0150] When the main control module 120 is working, in the crystal oscillator unit 127, the high-speed crystal oscillator Y1 is a high-speed active crystal oscillator with a frequency of 8 MHz, the resistor R6 is a crystal oscillator matching resistor, which can reduce the reflection of the clock signal in the circuit, and the capacitor C13 and the capacitor C14 are filter capacitors, which can reduce the high-frequency interference in the clock signal and make the clock signal more stable. The clock signal is a high-speed clock for the main control module 120, and all functions in the main control module 120 are based on the clock signal provided by the crystal oscillator unit 127, including signal processing, signal transmission, etc.

[0151] Fig. 9 FIG. 1 is a schematic diagram of the structure of the CAN communication module 1300 of the present utility model. Fig.10 FIG. 1 is a circuit diagram of the CAN communication module 1300 of the present invention. Fig. 9 , Fig.10 As shown, in an embodiment of the present utility model, the CAN communication module 1300 includes:

[0152] A second signal input unit 131 is connected to the main control module 120 and is used to receive a first signal sent by the main control module 120, where the first signal includes a pressure signal;

[0153] The transceiver unit 132 is connected to the second signal input unit 131 and is used to convert the first signal into a second signal, and the second signal is adapted to be transmitted on the CAN bus;

[0154] The bus interface unit 133 is connected to the transceiver unit 132 and is used to output the second signal to the CAN bus.

[0155] The utility model Fig.10 In the illustrated embodiment, the bus interface unit 133 includes two interfaces, namely, interface J7 and interface J8, and each of interface J7 and interface J8 has two ports.

[0156] In some achievable implementations of the present invention, the CAN communication module 1300 further includes:

[0157] A power interface unit 134, one end of which is connected to an external power source, and the other end of which is connected to a first end of the first filter unit 135, for supplying power to the CAN communication module;

[0158] In some achievable implementations of the present invention, the CAN communication module 1300 further includes:

[0159] The first filtering unit 135 has a first end connected to the transceiver unit 132 and a second end grounded, and is used to filter out interference signals in the power supply signal.

[0160] In some achievable implementations of the present invention, the CAN communication module 1300 further includes:

[0161] A second filtering unit 136, the bus interface unit 133 is connected to the transceiver unit 132 through the second filtering unit 136, and the second filtering unit 136 is used to filter out interference signals in the CAN communication module 1300;

[0162] The first end of the second filtering unit 136 is connected to the first output end of the transceiver unit 132 , and the second end of the second filtering unit 136 is connected to the second output end of the transceiver unit 132 .

[0163] In some achievable implementations of the present invention, the CAN communication module 1300 further includes:

[0164] The protection unit 137 is connected to the bus interface unit 133 and is used to protect the CAN communication module 1300;

[0165] In some achievable implementations of the present invention, the CAN communication module 1300 further includes:

[0166] A selection unit 138, used to select whether to connect the impedance matching unit 139 to the CAN communication module 1300;

[0167] In some achievable implementations of the present invention, the CAN communication module 1300 further includes:

[0168] The impedance matching unit 139 is connected to the selection unit 138 and is used to reduce the reflection interference of the signal after connecting to the CAN communication module 1300.

[0169] like Fig.10 As shown, the second signal input unit 131 includes a resistor R3 and a resistor R5. One end of the resistor R3 is connected to the 33rd pin of the MCU unit 122, and the other end is connected to the 1st pin of the transceiver U1.

[0170] One end of the resistor R5 is connected to the 32nd pin of the MCU unit 122, and the other end is connected to the 4th pin of the transceiver U1.

[0171] The transceiver unit 132 includes a transceiver U1, a resistor R2, a capacitor C1, a capacitor C9 and a capacitor C10. Among them, the No. 2 pin of the transceiver U1 is grounded, and the No. 3 pin of the transceiver U1 is grounded through the first filtering unit 135. The No. 5 pin of the transceiver U1 is grounded through the capacitor C9, and the No. 5 pin of the transceiver U1 is also connected to the 3.3V power supply. The No. 6 pin of the transceiver U1 is grounded through the capacitor C10, the No. 7 pin of the transceiver U1 is grounded through the capacitor C1, and the No. 8 pin of the transceiver U1 is grounded through the resistor R2.

[0172] In some achievable implementations of the present invention, the first filtering unit 135 includes:

[0173] The first capacitor group 1351 includes at least two capacitors connected in parallel. A first end of the first capacitor group 1351 is connected to a power input end of the transceiver unit 132 , and a second end of the first capacitor group 1351 is grounded.

[0174] The utility model is implemented as follows Fig.10 In the illustrated embodiment, the first capacitor group 1351 includes a capacitor C11 and a capacitor C12 connected in parallel. In other embodiments of the present invention, the first capacitor group 1351 may be composed of other numbers of capacitors connected in parallel.

[0175] A first end of the capacitor C11 and the capacitor C12 connected in parallel is connected to a 5V power supply, and a second end of the capacitor C11 and the capacitor C12 connected in parallel is grounded.

[0176] In some feasible implementations of the present invention, the second filtering unit 136 includes a common mode inductor L1, a first end of the common mode inductor L1 is connected to the first output end of the transceiver unit 132, and a second end of the common mode inductor L1 is connected to the second output end of the transceiver unit 132.

[0177] In some achievable implementations of the present invention, the impedance matching unit 139 may be a resistor R4, one end of which is connected to pin No. 6 of the transceiver U1, and the other end of which is connected to the second end of a one-bit dip switch SW2.

[0178] In some achievable implementations of the present invention, the selection unit 138 may be a one-bit dip switch SW2, a first end of the one-bit dip switch SW2 is connected to the No. 7 pin of the transceiver U1, and a second end of the one-bit dip switch SW2 is connected to the No. 6 pin of the transceiver U1 through a resistor R4. By setting the one-bit dip switch SW2, it can be selected whether to connect the impedance matching unit 139, i.e., the resistor R4, to the CAN communication module 1300.

[0179] In some practicable implementations of the present invention, the protection unit 137 includes:

[0180] A transient voltage suppression diode DZ1, a first end of the transient voltage suppression diode DZ1 is connected to the third end of the common mode inductor L1, a second end of the transient voltage suppression diode DZ1 is connected to the fourth end of the common mode inductor L1, and a third end of the transient voltage suppression diode DZ1 is grounded.

[0181] The utility model Fig.10 In the illustrated embodiment, the first end of the common mode inductor L1 in the second filtering unit 136 is connected to the No. 7 pin of the transceiver U1, the second end of the common mode inductor L1 is connected to the No. 6 pin of the transceiver U1, the third end of the common mode inductor L1 is connected to the No. 1 port of the interface J8 and the No. 1 port of the interface J7, and the fourth end of the common mode inductor L1 is connected to the No. 2 port of the interface J8 and the No. 2 port of the interface J7. The first end of the resistor R4 is connected to the second end of the common mode inductor L1, the second end of the resistor R4 is connected to the second end of the selection unit 138, and the first end of the selection unit 138 is connected to the first end of the common mode inductor L1, that is, the resistor R4 is connected between the first end and the second end of the common mode inductor L1 through the selection unit 138. Since the first end of the common-mode inductor L1 is connected to pin 7 of the transceiver U1, and the second end of the common-mode inductor L1 is connected to pin 6 of the transceiver U1, the selection unit 138 can select whether to connect the resistor R4 across pins 6 and 7 of the transceiver U1.

[0182] In the embodiment of the utility model, the first signal may include other signals in addition to the pressure signal, and the first signal cannot be directly transmitted on the CAN bus. The conversion from the first signal to the second signal may include voltage conversion, code conversion, etc., and the converted second signal can be adapted to be transmitted on the CAN bus. Therefore, in the utility model, the second signal input unit 131 in the CAN communication module 1300 receives the first signal sent by the main control module 120, and the transceiver unit 132 converts the first signal into a second signal, and the second signal is adapted to be transmitted on the CAN bus; the bus interface unit 133 outputs the second signal to the CAN bus.

[0183] In the CAN communication module 1300, the No. 1 pin and the No. 4 pin of the transceiver U1 are connected to the No. 33 pin and the No. 32 pin of the MCU unit 122 through the resistor R3 and the resistor R5, respectively. The resistor R3 and the resistor R5 play the role of impedance matching in the circuit, which can reduce the reflection of the signal in the line. The No. 2 pin and the No. 3 pin of the transceiver U1 are power supply pins, which are used to power the CAN communication module 1300; the No. 2 pin is grounded, the No. 3 pin is connected to the 5V power supply, and the No. 3 pin is also grounded through the capacitor C11 and the capacitor C12, respectively. The capacitor C11 and the capacitor C12 can reduce the interference of the power supply and / or the ground and the influence of noise, and play the role of filtering and stabilizing the power supply. The No. 6 pin and the No. 7 pin of the transceiver U1 are differential output pins, and the capacitor C10 and the capacitor C1 connected to the No. 6 pin and the No. 7 pin are bus data signal filtering capacitors. Pin 8 of transceiver U1 is grounded through resistor R2, which is a pull-down resistor for providing a low level to pin 8 of transceiver U1, i.e., STB pin. Pin 3 of transceiver U1 is connected to a 3.3V power supply and is also grounded through capacitor C9, which is a power supply filter capacitor.

[0184] SW2 is a one-bit dip switch, and the one-bit dip switch SW2 can be used to select whether to connect the terminal resistor R4 between the No. 6 pin of the transceiver U1 and the No. 7 pin of the transceiver U1. In other words, in terms of signals, the one-bit dip switch SW2 can be used to select whether to connect the resistor R4 between the input end of the bus CANH signal and the input end of the CANL signal. Specifically, when the one-bit dip switch SW2 is in the closed state, the resistor R4 is not connected between the first end of the common-mode inductor L1 and the second end of the common-mode inductor L1. When the one-bit dip switch SW2 is in the open state, the resistor R4 is connected between the first end of the common-mode inductor L1 and the second end of the common-mode inductor L1, that is, the resistor R4 is connected to the CAN communication module 1300.

[0185] After being connected to the CAN communication module 1300, the resistor R4 can achieve impedance matching and reduce the reflection interference of the signal in the circuit. The function of the common mode inductor L1 is to filter out the common mode interference in the bus. The function of the transient voltage suppression diode DZ1 is to protect the circuit from static electricity and avoid damage to the CAN communication module 1300.

[0186] Fig.11 FIG. 1 is a schematic diagram of the structure of the power supply module 140 of the present invention. Fig.12 Shown is a circuit diagram of the power supply module 140 of the present invention.

[0187] Combination Fig.11 , Fig.12 As shown, the power supply module 140 includes:

[0188] A front-end filtering unit 141, configured to filter out interference in the first voltage;

[0189] The voltage conversion module 142 is connected to the front-end filtering unit 141 and is used to convert the first voltage after the interference is filtered out into a second voltage;

[0190] A back-end filtering unit 143, connected to the voltage conversion module 142, for filtering out interference in the second voltage;

[0191] Optionally, the power supply module 140 further includes:

[0192] The separation unit 144 has a first end connected to the digital ground and a second end connected to the analog ground, and is used to separate the digital ground from the analog ground.

[0193] Optionally, the front-end filtering unit 141 includes:

[0194] A bidirectional transient voltage suppressor TVS1, a first end of which is grounded, and a second end of which is connected to an external 5V power supply;

[0195] The second capacitor group 1411 includes multiple capacitors in parallel. The first end of the second capacitor group 1411 is connected to the second end of the bidirectional transient voltage suppressor TVS1. The first end of the second capacitor group 1411 is also connected to the input end of the voltage conversion module 142. The second end of the second capacitor group 1411 is grounded.

[0196] Optionally, the back-end filtering unit 143 includes:

[0197] The third capacitor group 1431 includes at least two capacitors connected in parallel. A first end of the third capacitor group 1431 is connected to the output end of the voltage conversion module 142 , and a second end is grounded.

[0198] Optionally, the separation unit 144 may be a resistor R1 , which is disposed between the digital ground and the analog ground to separate the digital ground from the analog ground.

[0199] Optionally, the power supply module 140 further includes a power supply socket J1, through which an external power source is connected to the power supply module 140 and provides a 5V voltage to the power supply module 140. The power supply module 140 supplies power to the outside through the power supply socket J1.

[0200] Fig.12 In the illustrated embodiment, the second capacitor group 1411 includes five capacitors connected in parallel, namely capacitor C2, capacitor C4, capacitor C5, capacitor C6 and capacitor C7. In other embodiments of the present invention, the second capacitor group 1411 may be composed of other numbers of capacitors connected in parallel.

[0201] Fig.12In the illustrated embodiment, the third capacitor group 1431 includes two capacitors connected in parallel, namely capacitor C3 and capacitor C8. In other embodiments of the present invention, the third capacitor group 1431 may be composed of other numbers of capacitors connected in parallel.

[0202] In the embodiment of the utility model, the separation unit 144 is arranged in the power supply module 140. In fact, the separation unit 144 can be arranged in other modules, for example, it can be arranged in the main control module 120 and the signal amplification module 150, which will not be repeated here.

[0203] In the embodiment of the utility model, the power supply requirements of various functional modules and units are not exactly the same. Some functional modules and units require 5V power supply, such as the second communication module 130 requires 5V power supply; some functional modules and units require 3.3V power supply, such as the identification unit 123 and the status indication unit 125 require 3.3V power supply. Usually, there is only one voltage connected from the external power supply. In the utility model, a 5V power supply is connected from the outside. In the embodiment of the utility model, after the external 5V power supply is connected to the power supply module 140, the power supply module 140 converts it into 3.3V for use by other functional modules and units.

[0204] Specifically, the external power supply is connected to the power supply module 140 through the power supply socket J1, and provides a 5V voltage to the power supply module 140, and the power supply module 140 supplies power to the outside through the power supply socket J1. The bidirectional transient voltage suppression tube TVS1 is used as an anti-reverse connection and electrostatic discharge device to protect the subsequent circuit. VR1 in the voltage conversion module 142 converts the 5V power supply into 3.3V. Capacitor C3 and capacitor C8 are output filter capacitors, which can reduce the interference and noise of the power supply and / or ground. Resistor R1 is set between the digital ground and the analog ground to separate the digital ground from the analog ground.

[0205] Fig.13 FIG. 1 is a schematic diagram showing the structure of the signal amplification module 150 in the pressure detection circuit of the present invention. Fig.14 FIG. 1 is a circuit diagram of a signal amplifying module 150 in a pressure detection circuit of the present invention.

[0206] refer to Fig.13 , Fig.14 As shown, the signal amplification module 150 includes:

[0207] A third signal input unit 151 is connected to the pressure detection module 110 and is used to receive a pressure signal from the pressure detection module 110;

[0208] an amplifying unit 152, for amplifying the pressure signal;

[0209] The signal output unit 153 is used to output the amplified pressure signal.

[0210] For ease of explanation, Fig.14 The illustrated embodiment shows some components of the pressure detection module 110 . In actual applications, the pressure detection module 110 is disposed outside the signal amplification module 150 .

[0211] The pressure detection module 110 includes a Honeywell sensor (not shown) and a socket J3, and the Honeywell sensor outputs the detected pressure through the socket J3. The pressure detection module 110 also includes a capacitor C24 and a capacitor C25. The capacitor C24 and the capacitor C25 are connected in parallel, and after being connected in parallel, they are connected between an external 5V power supply and an analog ground. Port 1 of the socket J3 is connected to a 5V power supply, and port 4 is connected to an analog ground. The voltage difference between ports 2 and 3 of the socket J3 is the detected pressure signal.

[0212] Port No. 2 of the socket J3 is connected to pin No. 1 of the amplifier U3, i.e., the positive input terminal of the amplifier U3, through a resistor R21, and port No. 3 of the socket J3 is connected to pin No. 8 of the amplifier U3, i.e., the reverse input terminal of the amplifier U3, through a resistor R23.

[0213] refer to Fig.13 , Fig.14 As shown, the third signal input unit 151 includes a resistor R21, a resistor R22 and a resistor R23. The amplifying unit 152 includes an amplifier U3, a capacitor C26 and a capacitor C27.

[0214] Pin 1 of the amplifier U3 is also connected to pin 8 of the amplifier U3 via resistor R22.

[0215] Capacitor C26 and capacitor C27 are connected in parallel and connected between an external 5V power supply and an analog ground.

[0216] Pins 3 and 7 of amplifier U3 are both connected to a 5V power supply, and pin 2 of amplifier U3 is connected to analog ground. Pin 4 of amplifier U3 is connected to a 1.5V power supply, which is the reference voltage provided by reference voltage module 160. Pin 6 of amplifier U3 outputs the amplified pressure signal.

[0217] The signal output unit 153 is Fig.14 Not shown in the figure, the signal output unit 153 can be any device, port, connector or socket that can output.

[0218] In the embodiment of the utility model, the pressure detection module 110 detects pressure and outputs a pressure signal through the socket J3. The pressure signal output by the pressure detection module 110 is an analog signal. The pressure signal from the socket J3 enters the amplifier U3 through the third signal input unit 151, is amplified by the amplifier U3, and the amplified pressure signal Pre_AD1 is sent to the first signal input unit 124 of the main control module through the signal output unit 153. In the first signal input unit 124, the amplified pressure signal Pre_AD1 enters the 16th pin of the MCU unit 122 through the resistor R8. The amplified pressure signal Pre_AD1 is an analog signal, and after entering the MCU unit 122, the MCU unit 122 performs analog-to-digital conversion.

[0219] The capacitor C24 and the capacitor C25 connected to the No. 1 port of the socket J3 are filter capacitors, which can reduce the interference of the power supply and / or the ground and the influence of noise. The resistor R21, the resistor R22 and the resistor R23 in the third signal input unit 151 are reserved impedance matching circuits, which can be adjusted according to actual needs. The amplifier U3 is a differential operational amplifier, and the amplification factor of the amplifier U3 can be determined by configuring the resistance values ​​of the resistor R20 and the resistor R24, and the differential signal is converted into a single-ended signal. The capacitor C26 and the capacitor C27 connected to the No. 3 pin and the No. 7 pin of the amplifier U3 are power filter capacitors of the amplifier U3, which can reduce the interference of the power supply and / or the ground and the influence of noise.

[0220] The utility model Figure 4 In the illustrated embodiment, two amplified pressure signals are shown, namely, the amplified pressure signal Pre_AD1 connected to the 16th pin of the MCU unit 122, and the amplified pressure signal Pre_AD2 connected to the 17th pin of the MCU unit 122. In practical applications, the main control module 120 can receive and process multiple pressure signals, or only receive and process one pressure signal.

[0221] If it is necessary to detect multiple pressures, multiple pressure detection modules 110 and multiple signal amplification modules 150 matched with the pressure detection modules 110 can be provided. The structure of each signal amplification module 150 is as above, and is used to amplify the pressure signal and transmit the amplified pressure signal to the main control module 120. For example, in another embodiment of the utility model, two signal amplification modules are included to amplify the pressure signal, and transmit the amplified pressure signal Pre_AD1 and the amplified pressure signal Pre_AD2 to the 16th pin and the 17th pin of the main control module MCU unit 122, respectively.

[0222] Fig.15 FIG. 1 is a schematic diagram of a circuit of a reference voltage module 160 in a voltage detection circuit of the present invention. Fig.15As shown, the reference voltage module 160 includes an amplifier U4, a resistor R25, a resistor R26, a resistor R27 and a capacitor C28.

[0223] Pin 5 of amplifier U4, i.e., the VCC+ terminal, is connected to an external 5V power supply to provide operating voltage to amplifier U4. Pin 5 of amplifier U4 is also connected to analog ground through capacitor C28. Pin 3 of amplifier U4, i.e., the reverse input terminal, is connected to pin 4 of amplifier U4 through resistor R25, and pin 4 of amplifier U4 is the output terminal. Pin 1 of amplifier U4, i.e., the positive input terminal, is grounded through resistor R27; pin 1 of amplifier U4 is also connected to a 5V power supply through resistor R26. Pin 2 of the amplifier, i.e., the ground terminal, is connected to analog ground. Pin 4 of amplifier U4 outputs a 1.5V power supply, which is provided to signal amplification module 150 as a reference voltage.

[0224] The utility model Fig.15 In the embodiment, the external power supply 5V enters the positive input terminal of the amplifier U4 after the voltage division of the resistor R26 and the resistor R27. The above connection mode of the amplifier U4 is a voltage follower mode. Through the negative feedback mode of the amplifier, a voltage of 1.5V can be stably output. Among them, the role of the resistor R26 and the resistor R27 is voltage division. By adjusting the resistance values ​​of the resistor R26 and the resistor R27, the voltage input to the positive input terminal of the amplifier U4 can be adjusted. Capacitor C28 is a filter capacitor, which can achieve filtering, anti-interference and protection. The connection mode of the resistor R25 and the amplifier U4 constitutes a negative feedback circuit, which can make the output voltage more stable, and the resistance value of the resistor R25 can be adjusted according to demand. By adjusting the resistance values ​​of the resistors R26 and R27, the reference voltage module 160 can also output other voltages, which will not be repeated here.

[0225] Fig.16 The figure shows a schematic diagram of a fluid circuit system for detecting the pressure of a fluid circuit according to the present invention. Fig.16 As shown, the liquid circuit system includes a first liquid circuit component and the above-mentioned pressure detection circuit 1000, the first liquid circuit component includes a first storage device 1611, a first rotary valve 1621, a first reaction device 1631 and a first pump component 1641, the first pump component 1641 drives the liquid in the first storage device 1611 to enter the first reaction device 1631 through the first rotary valve 1621, and the pressure detection module 110 in the pressure detection circuit includes a first pressure sensor 1001, and the first pressure sensor 1001 is used to detect the liquid circuit pressure between the first reaction device 1631 and the first pump component 1641.

[0226] Fig.17 FIG. 1 is a schematic diagram of a fluid circuit system for detecting the pressure of two fluid circuits of the utility model. Fig.17As shown, in this embodiment, in addition to Fig.16 In addition to the structure shown, optionally, the liquid circuit system also includes a second liquid circuit component, which includes a second storage device 1612, a second rotary valve 1622, a second reaction device 1632 and a second pump component 1642. The second pump component 1642 drives the liquid in the second storage device 1612 into the second reaction device 1632 through the second rotary valve 1622. The pressure detection module 110 also includes a second pressure sensor 1002, which is used to detect the liquid circuit pressure between the second reaction device 1632 and the second pump component 1642.

[0227] Fig.18 The figure shows a schematic diagram of a fluid circuit system for detecting the pressure of four fluid circuits of the utility model. Fig.18 As shown, the first liquid circuit component also includes a first three-way valve 1651, which is arranged between the first rotary valve 1621 and the first reaction device 1631. The first three-way valve 1651 includes a first port, a second port and a third port. The first port is connected to the first rotary valve 1621, the second port is connected to the first reaction device 1631, and the third port is connected to the first pump assembly 1641. The first pump assembly 1641 drives the liquid in the first storage 1611 to enter the first branch between the first three-way valve 1651 and the first pump assembly 1641 through the first rotary valve 1621 and the first three-way valve 1651.

[0228] The first pump assembly 1641 also drives the liquid in the first storage 1611 to enter the first reaction device 1631 through the first rotary valve 1621 and the first three-way valve 1651.

[0229] The second liquid circuit component also includes a second three-way valve 1652, which is arranged between the second rotary valve 1622 and the second reaction device 1632. The second three-way valve 1652 includes a fourth port, a fifth port and a sixth port. The fourth port is connected to the second rotary valve 1622, the fifth port is connected to the second reaction device 1632, and the sixth port is connected to the second pump assembly 1642. The second pump assembly 1642 drives the liquid in the second storage 1612 to enter the second branch between the second three-way valve 1652 and the second pump assembly 1642 through the second rotary valve 1622 and the second three-way valve 1652.

[0230] The second pump assembly 1642 also drives the liquid in the second storage 1612 to enter the second reaction device 1632 through the second rotary valve 1622 and the second three-way valve 1652 .

[0231] There are two pressure detection circuits, one of which is a first pressure detection circuit 1000, and the other is a second pressure detection circuit 2000. The pressure detection module of the first pressure detection circuit 1000 includes a first pressure sensor 1001 and a second pressure sensor 1002, and the pressure detection module of the second pressure detection circuit 2000 includes a third pressure sensor 2001 and a fourth pressure sensor 2002. The third pressure sensor 2001 is used to detect the pressure of the first branch, and the fourth pressure sensor 2002 is used to detect the pressure of the second branch.

[0232] In an embodiment of the utility model, there can be multiple storage devices in each liquid path system, which are used to store reaction reagents and cleaning agents, etc., respectively. Each pump assembly can be an injection pump. After the injection pump is started, it can generate positive pressure or negative pressure, and can pass the reaction reagents in the storage device through the rotary valve and the three-way valve in sequence, and then enter the reaction device to perform a biochemical reaction. If the reaction device needs to be cleaned during the biochemical reaction, the pump assembly can first pass the cleaning liquid in the storage device into the first branch between the third port of the three-way valve and the pump assembly for pre-storage, and when cleaning, the cleaning liquid is refluxed to the reaction device. In an embodiment of the utility model, each reaction device can be a specific chip, on which a sample to be tested is placed, and biochemical reactions, etc. can be performed.

[0233] In the embodiment of the present utility model, Fig.16 As shown, it includes a pressure detection circuit, and the pressure detection circuit includes a pressure sensor to detect the pressure of a liquid line. The embodiment of the utility model can also be as follows Fig.17 As shown, it includes a pressure detection circuit, and the pressure detection circuit includes two pressure sensors to detect the pressure of the two liquid circuits. Fig.18 As shown, two pressure detection circuits are included, and each pressure detection circuit includes two pressure sensors to detect the pressure of four liquid circuits.

[0234] In other embodiments of the present invention, more pressure detection circuits may be included, each of which includes one or two pressure sensors, and each pressure sensor can be used to detect the pressure of one liquid circuit. For example, one pressure detection circuit includes one pressure sensor that can detect the pressure of one liquid circuit, and another pressure detector includes two pressure sensors that can detect the pressure of two liquid circuits. When multiple pressure detection circuits are configured in other embodiments of the present invention, the liquid circuit configuration, the working principle and the connection method of the pressure detection circuit refer to those shown in the above embodiments, and will not be repeated here.

[0235] The fluid circuit system of the utility model embodiment includes a pressure detection circuit, and the pressure detection circuit includes: a pressure detection module, a main control module, a first communication module and a second communication module. In the utility model embodiment, the pressure detection circuit can communicate with different adapter devices, has a wide range of applications, and can meet different needs of users.

[0236] An embodiment of the utility model further provides a sequencing system, which includes the pressure detection circuit as described above; or includes the liquid circuit system as described above.

[0237] The sequencing system can be a biochemical substance analysis instrument, such as a gene sequencer. A variety of liquid reagents are used in the sequencing system, and different liquid reagents are used for sequencing. In the sequencing system of the utility model, the liquid reagent can flow in the liquid path system, and the liquid pressure of the liquid reagent in the liquid path system is detected by the pressure detection circuit.

[0238] The sequencing system of the utility model can communicate with different adapter devices, has a wide range of applications, and can meet the different needs of users.

[0239] The embodiments of the utility model provide a pressure detection circuit, a fluid circuit system and a sequencing system, including a first communication module and a second communication module, which can communicate with different adapter devices, have a wide range of applications, and can meet different needs of users.

[0240] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0241] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A pressure detection circuit, characterized in that: The pressure detection circuit comprises: A pressure detection module is used to detect pressure and send a pressure signal to a main control module; A main control module, used for receiving and outputting the pressure signal; A first communication module and a second communication module respectively connected to the main control module; Among them, the first communication module or the second communication module is set to be connected to the adapter device, the first communication module or the second communication module receives the pressure signal sent by the main control module and sends the pressure signal to the adapter device; or, the adapter device includes a first adapter device and a second adapter device, the first communication module and the second communication module are set to be connected to the first adapter device and the second adapter device respectively, the first communication module and the second communication module receive the pressure signal sent by the main control module and send the pressure signal to the first adapter device and the second adapter device respectively.

2. The pressure detection circuit according to claim 1, characterized in that: The first communication module is a communication interface module, which is used to receive the pressure signal sent by the main control module and send the pressure signal to an external communication module, and the external communication module then sends the pressure signal to an adapter device.

3. The pressure detection circuit according to claim 2, characterized in that: The communication interface module is an I2C communication interface module, and the second communication module is a CAN communication module.

4. The pressure detection circuit according to claim 3, characterized in that: The main control module comprises: MCU unit; The identification unit connected to the MCU unit is used to identify the main control module in the CAN bus to identify the pressure detection circuit where the main control module is located.

5. The pressure detection circuit according to claim 4, characterized in that: The main control module also includes a first signal input unit connected to the MCU unit, and the first signal input unit is used to receive the pressure signal sent by the pressure detection module.

6. The pressure detection circuit according to claim 4, characterized in that: The main control module further comprises a status indicating unit connected to the MCU unit, and the status indicating unit is used to indicate the status of the main control module.

7. The pressure detection circuit according to claim 4, characterized in that: The main control module further comprises a burning unit connected to the MCU unit, and the burning unit is used for receiving a burning signal and burning the main control module according to the burning signal.

8. The pressure detection circuit according to claim 4, characterized in that: The main control module also includes a crystal oscillator unit connected to the MCU unit, and the crystal oscillator unit is used to provide a clock signal required by the main control module.

9. The pressure detection circuit according to claim 3, characterized in that: The CAN communication module comprises: A second signal input unit, connected to the main control module, and configured to receive a first signal sent by the main control module, wherein the first signal includes the pressure signal; a transceiver unit connected to the second signal input unit, and configured to convert the first signal into a second signal, wherein the second signal is adapted to be transmitted on a CAN bus; A bus interface unit is connected to the transceiver unit and is used to output the second signal to the CAN bus.

10. The pressure detection circuit according to claim 9, characterized in that: The CAN communication module also includes a power interface unit connected to an external power source for supplying power to the CAN communication module.

11. The pressure detection circuit according to claim 10, characterized in that: The CAN communication module also includes a first filtering unit, a first end of which is respectively connected to the transceiver unit and the power interface unit, and a second end is grounded, for filtering out interference signals in the power supply signal.

12. The pressure detection circuit according to claim 11, characterized in that: The CAN communication module also includes: a second filtering unit, the bus interface unit is connected to the transceiver unit through the second filtering unit, and the second filtering unit is used to filter out interference signals in the CAN communication module, wherein the first end of the second filtering unit is connected to the first output end of the transceiver unit, and the second end of the second filtering unit is connected to the second output end of the transceiver unit.

13. The pressure detection circuit according to claim 12, characterized in that: The CAN communication module also includes a protection unit connected to the bus interface unit and used for protecting the CAN communication module.

14. The pressure detection circuit according to claim 13, characterized in that: The CAN communication module also includes an impedance matching unit connected to the selection unit, which is used to reduce reflection interference of the signal after the CAN communication module is connected.

15. The pressure detection circuit according to claim 14, characterized in that: The CAN communication module further includes a selection unit for selecting whether to connect the impedance matching unit to the CAN communication module.

16. The pressure detection circuit according to claim 11, characterized in that: The first filtering unit comprises: A first capacitor group, wherein the first capacitor group includes at least two capacitors connected in parallel, a first end of the first capacitor group is connected to a power input end of the transceiver unit, and a second end of the first capacitor group is grounded.

17. The pressure detection circuit according to claim 13, characterized in that: The second filtering unit includes a common mode inductor, a first end of the common mode inductor is connected to the first output end of the transceiver unit, and a second end of the common mode inductor is connected to the second output end of the transceiver unit.

18. The pressure detection circuit according to claim 17, characterized in that: The protection unit comprises: A transient voltage suppression diode, wherein a first end of the transient voltage suppression diode is connected to a third end of the common mode inductor, a second end of the transient voltage suppression diode is connected to a fourth end of the common mode inductor, and a third end of the transient voltage suppression diode is grounded.

19. The pressure detection circuit according to claim 1, characterized in that: The pressure detection circuit also includes: The power supply module is connected to the external power supply and the main control module respectively, and is used to convert the first voltage of the external power supply into a second voltage, and supply power to the main control module according to the second voltage.

20. The pressure detection circuit according to claim 19, characterized in that: The power supply module comprises: A front-end filtering unit, used to filter out interference in the first voltage; A voltage conversion module, connected to the front-end filter unit, and used for converting the first voltage after filtering out interference into a second voltage; The back-end filtering unit is connected to the voltage conversion module and is used to filter out interference in the second voltage.

21. The pressure detection circuit according to claim 20, characterized in that: The power supply module further includes a separation unit, a first end of which is connected to the digital ground, and a second end of which is connected to the analog ground, for separating the digital ground from the analog ground.

22. The pressure detection circuit according to claim 20, characterized in that: The front-end filtering unit comprises: A bidirectional transient voltage suppressor tube, a first end of which is grounded, and a second end of which is connected to the positive electrode of an external power supply; The second capacitor group includes multiple capacitors connected in parallel, the first end of the second capacitor group is connected to the second end of the bidirectional transient voltage suppressor, the first end of the second capacitor group is also connected to the input end of the voltage conversion module, and the second end of the second capacitor group is grounded.

23. The pressure detection circuit according to claim 20, characterized in that: The back-end filtering unit comprises: A third capacitor group, the third capacitor group includes at least two capacitors connected in parallel, a first end of the third capacitor group is connected to the output end of the voltage conversion module, and a second end is grounded.

24. The pressure detection circuit according to claim 1, characterized in that: The pressure detection circuit also includes: A signal amplifying module is connected to the pressure detecting module and is used to amplify the pressure signal from the pressure detecting module.

25. The pressure detection circuit according to claim 24, characterized in that: The signal amplification module comprises: a third signal input unit, connected to the pressure detection module, and configured to receive the pressure signal from the pressure detection module; an amplifying unit, used for amplifying the pressure signal; A signal output unit is used to output the amplified pressure signal.

26. The pressure detection circuit according to claim 24, characterized in that: The pressure detection circuit also includes: A reference voltage module is used to provide a reference voltage to the signal amplification module.

27. A fluid circuit system, characterized in that: The fluid circuit system includes a first fluid circuit component and a pressure detection circuit as described in any one of claims 1 to 26, wherein the first fluid circuit component includes a first storage device, a first rotary valve, a first reaction device and a first pump component, wherein the first pump component drives the liquid in the first storage device into the first reaction device through the first rotary valve, and the pressure detection module includes a first pressure sensor, and the first pressure sensor is used to detect the fluid circuit pressure between the first reaction device and the first pump component.

28. The fluid circuit system according to claim 27, characterized in that: The liquid circuit system also includes a second liquid circuit component, which includes a second storage device, a second rotary valve, a second reaction device and a second pump component. The second pump component drives the liquid in the second storage device to enter the second reaction device through the second rotary valve. The pressure detection module also includes a second pressure sensor, which is used to detect the liquid circuit pressure between the second reaction device and the second pump component.

29. The fluid circuit system according to claim 28, characterized in that: The first liquid circuit assembly further includes a first three-way valve, which is disposed between the first rotary valve and the first reaction device, and includes a first port, a second port, and a third port, wherein the first port is connected to the first rotary valve, the second port is connected to the first reaction device, and the third port is connected to the first pump assembly, and the first pump assembly drives the liquid in the first reservoir to enter the first branch between the first three-way valve and the first pump assembly through the first rotary valve and the first three-way valve; The second liquid circuit assembly further includes a second three-way valve, which is disposed between the second rotary valve and the second reaction device, and includes a fourth port, a fifth port, and a sixth port, wherein the fourth port is connected to the second rotary valve, the fifth port is connected to the second reaction device, and the sixth port is connected to the second pump assembly, and the second pump assembly drives the liquid in the second storage device to enter the second branch between the second three-way valve and the second pump assembly through the second rotary valve and the second three-way valve; The pressure detection circuits are provided with two, one of which is a first pressure detection circuit, and the other is a second pressure detection circuit. The pressure detection module of the first pressure detection circuit includes the first pressure sensor and the second pressure sensor, and the pressure detection module of the second pressure detection circuit includes a third pressure sensor and a fourth pressure sensor. The third pressure sensor is used to detect the pressure of the first branch, and the fourth pressure sensor is used to detect the pressure of the second branch.

30. A sequencing system, characterized in that: The sequencing system comprises the pressure detection circuit as described in any one of claims 1-26; or comprises the liquid circuit system as described in any one of claims 27-29.

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