An intrinsically safe circuit and hydrogenation machine for data acquisition in hydrogenation environment

Abstract

The present application provides an intrinsically safe circuit and a hydrogenator for data acquisition in a hydrogenation environment, comprising at least one connection port; a signal conditioning circuit connected to the connection port; an ADC chip connected to the signal conditioning circuit; the connection port comprises a power supply terminal, an acquisition terminal and a ground terminal; the signal conditioning circuit comprises a power supply line connected to the power supply terminal; an acquisition circuit connected to the acquisition terminal; the power supply line comprises a first protection unit connected to a power input terminal; a first voltage stabilizing unit connected to the first protection unit; a current limiting unit connected to the first voltage stabilizing unit; the current limiting unit is connected to the power supply terminal; the acquisition circuit comprises a unidirectional conduction unit connected to the acquisition terminal; a second voltage stabilizing unit connected to the unidirectional conduction unit; a second protection unit connected to the second voltage stabilizing unit; the second protection unit is connected to the ADC chip.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogenation equipment, and in particular to an intrinsically safe circuit and a hydrogenation machine for data collection in a hydrogenation environment. Background Art

[0002] At present, sensors and control systems in various dangerous environments of hydrogen refueling stations are generally connected by safety isolation fences. The control system of a hydrogen refueling machine often has 4 or more sensors that need to be connected to the control system. However, the internal space of the hydrogen refueling machine is already very small, and the installation of a safety isolation fence requires an additional explosion-proof box, which not only increases the equipment cost, but also makes the space inside the hydrogen refueling machine very small. Therefore, it is necessary to provide a connection solution to reduce the equipment cost and the size of the hydrogen refueling machine while meeting the explosion-proof standards. Summary of the invention

[0003] The purpose of the present application is to provide an intrinsically safe circuit and a hydrogenation machine for data acquisition in a hydrogenation environment, so as to achieve the technical effect of reducing equipment costs and reducing the volume of the hydrogenation machine while meeting explosion-proof standards.

[0004] In the first aspect, an embodiment of the present application provides an intrinsically safe circuit for data acquisition in a hydrogenation environment, comprising at least one connection port; a signal conditioning circuit connected to the connection port; an ADC chip connected to the signal conditioning circuit; the connection port comprises a power supply terminal, an acquisition terminal and a ground terminal; the signal conditioning circuit comprises a power supply line connected to the power supply terminal; an acquisition circuit connected to the acquisition terminal; the power supply line comprises a first protection unit connected to a power input terminal; a first voltage stabilizing unit connected to the first protection unit; a current limiting unit connected to the first voltage stabilizing unit; the current limiting unit is connected to the power supply terminal; the acquisition circuit comprises a unidirectional conduction unit connected to the acquisition terminal; a second voltage stabilizing unit connected to the unidirectional conduction unit; a second protection unit connected to the second voltage stabilizing unit; the second protection unit is connected to the ADC chip.

[0005] Furthermore, the unidirectional conduction unit includes a first Schottky diode and a second Schottky diode; the anode of the first Schottky diode is connected to the collection end; the cathode of the first Schottky diode is connected to the anode of the second Schottky diode; and the cathode of the second Schottky diode is connected to the input end of the second voltage stabilizing unit.

[0006] Furthermore, the intrinsically safe circuit also includes a DC / DC module connected to the power input terminal.

[0007] Furthermore, the intrinsically safe circuit also includes a controller connected to the ADC chip; the controller and the ADC chip are connected via a photoelectric coupler.

[0008] Furthermore, the intrinsically safe circuit also includes a grounding resistance unit connected to the second protection unit.

[0009] Furthermore, the intrinsically safe circuit further comprises a band-stop filter unit; an input end of the band-stop filter unit is connected to the second protection unit; and an output end of the band-stop filter unit is connected to the ADC chip.

[0010] In a second aspect, the present application provides a hydrogen refueling machine, including an explosion-proof box and the above-mentioned intrinsically safe circuit arranged in the explosion-proof box.

[0011] The beneficial effects that can be achieved by the present application are: the current type sensor is connected to the connection port; the voltage input from the power input terminal is input into the current type sensor after passing through the first protection unit, the first voltage stabilizing unit and the current limiting unit; the current output by the current type sensor flows into the ADC chip through the acquisition terminal, the unidirectional conduction unit, the second voltage stabilizing unit and the second protection unit; the unidirectional conduction unit can prevent the current on one side of the ADC chip from affecting the operating parameters of the current type sensor after the connection port, and at the same time, connecting the current type sensor through the intrinsically safe circuit also reduces the equipment cost and the size of the hydrogen filling machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the connection method of sensors in existing hazardous environments;

[0014] Figure 2 A schematic diagram of a sensor connection method provided in an embodiment of the present application;

[0015] Figure 3 A schematic diagram of an intrinsically safe circuit topology structure for data collection in a hydrogenation environment provided in an embodiment of the present application;

[0016] Figure 4 A schematic diagram of a signal conditioning circuit provided in an embodiment of the present application;

[0017] Figure 5 A schematic diagram of a DC / DC module provided in an embodiment of the present application.

[0018] Icons: 10-intrinsically safe circuit; 100-signal conditioning circuit; 110-first protection unit; 120-first voltage stabilizing unit; 130-current limiting unit; 140-connection port; 150-one-way conduction unit; 160-second voltage stabilizing unit; 170-second protection unit; 180-grounding resistance unit; 190-band-stop filter unit; 200-ADC chip; 300-controller; 400-DC / DC module. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0020] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0021] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 1 It is a schematic diagram of the connection method of sensors in existing hazardous environments; Figure 2 A schematic diagram of a sensor connection method provided in an embodiment of the present application; Figure 3 A schematic diagram of an intrinsically safe circuit topology structure for data collection in a hydrogenation environment provided in an embodiment of the present application; Figure 4 A schematic diagram of a signal conditioning circuit provided in an embodiment of the present application; Figure 5 A schematic diagram of a DC / DC module provided in an embodiment of the present application.

[0022] like Figure 1 , Figure 2 As shown, the sensors and control systems in the dangerous environment of hydrogen refueling stations are generally connected by safety isolation fences. The control system of a hydrogen refueling machine often has 4 or even more sensors that need to be connected to the control system, which will cause two problems: 1. Increased cost; 2. Space congestion, because the internal space of the hydrogen refueling machine is already very small, and the installation of the safety isolation fence requires an exceptional explosion-proof box. Therefore, in order to reduce the equipment cost and the size of the hydrogen refueling machine while meeting the explosion-proof standards, the embodiment of the present application provides an intrinsically safe circuit for data acquisition in the hydrogenation environment. By connecting sensors through the intrinsically safe circuit, both the equipment cost and the size of the hydrogen refueling machine can be reduced.

[0023] like Figure 3 , 4As shown, the intrinsically safe circuit 10 provided in the embodiment of the present application includes at least one connection port 140; a signal conditioning circuit 100 correspondingly connected to the connection port 140; an ADC chip 200 connected to the signal conditioning circuit 100; the connection port 140 includes a power supply terminal (terminal 1 of P1), a collection terminal (terminal 2 of P1) and a ground terminal (terminal 3 of P1); the signal conditioning circuit 100 includes a power supply circuit connected to the power supply terminal; a collection circuit connected to the collection terminal; the power supply circuit includes a first protection unit 110 connected to the power input terminal; a first voltage stabilizing unit 120 connected to the first protection unit 110; a current limiting unit 130 connected to the first voltage stabilizing unit 120; the current limiting unit 130 is connected to the power supply terminal; the collection circuit includes a unidirectional conduction unit 150 connected to the collection terminal; a second voltage stabilizing unit 160 connected to the unidirectional conduction unit 150; a second protection unit 170 connected to the second voltage stabilizing unit 160; the second protection unit 170 is connected to the ADC chip 200. In order to facilitate the connection of multiple sensors in the hydrogenation machine, in one embodiment, the number of connection ports 140 can be set to 4 or more; each connection port 140 is connected to a corresponding signal conditioning circuit 100. The second protection unit 170 in each signal conditioning circuit 100 is connected to the I / O port in the ADC chip 200.

[0024] In one embodiment, the first protection unit 110 is a fuse F2, and the first end of the fuse F2 is connected to the power input end; the first voltage stabilizing unit 120 includes a voltage stabilizing diode D5 and a voltage stabilizing diode D6; the cathodes of the voltage stabilizing diode D5 and the voltage stabilizing diode D6 are both connected to the second end of the fuse F2, and the anodes of the voltage stabilizing diode D5 and the voltage stabilizing diode D6 are grounded; the current limiting unit 130 includes a current limiting resistor R3 and a current limiting resistor R4, and the current limiting resistor R3 and the current limiting resistor R4 are connected in parallel, and one end is connected to the cathode of the voltage stabilizing diode D5 and the voltage stabilizing diode D6, and the other end is connected to the power supply end (terminal 1 of P1) of the connection port 140 (P1).

[0025] The unidirectional conducting unit 150 includes a first Schottky diode D4 and a second Schottky diode D3; the anode of the first Schottky diode D4 is connected to the collection end (terminal 2 of P1); the cathode of the first Schottky diode D4 is connected to the anode of the second Schottky diode D3; the cathode of the second Schottky diode D3 is connected to the input end of the second voltage stabilizing unit 160.

[0026] The second voltage stabilizing unit 160 includes a third voltage stabilizing diode D1 and a fourth voltage stabilizing diode D2, wherein the cathodes of the third voltage stabilizing diode D1 and the fourth voltage stabilizing diode D2 are connected to the cathode of the second Schottky diode D3; the anodes of the third voltage stabilizing diode D1 and the fourth voltage stabilizing diode D2 are grounded; the second protection unit 170 is a fuse F1, wherein the first end of the fuse F1 is connected to the cathodes of the third voltage stabilizing diode D1 and the fourth voltage stabilizing diode D2, and the second end of the fuse F1 is connected to the ADC chip 200.

[0027] like Figure 5 As shown, in one embodiment, the power input terminal can also be connected to a DC / DC module 400, and the 12V DC power supply is converted into 24V DC power by the DC / DC module 400, which not only meets the power supply demand of the sensor, but also isolates the power supply from the circuit where the sensor is located, thereby improving the safety of the circuit. The DC / DC module 400 can be selected from, but not limited to, a DC-DC chip of model VRB1224S-6WR3.

[0028] The intrinsically safe circuit 10 provided in the embodiment of the present application also includes a controller 300, and the 12V DC output terminal of the controller 300 is connected to the input terminal of the DC / DC module 400; the output terminal of the DC / DC module 400 is connected to the power input terminal of the power supply circuit. The CS pin in the SPI pin of the controller 300 is connected to the CS pin of the controller 300 through a photocoupler; the CLK pin in the SPI pin of the controller 300 is connected to the CLK pin of the controller 300 through a photocoupler; the MISO pin in the SPI pin of the controller 300 is connected to the MISO pin of the controller 300 through a photocoupler; the MISI pin in the SPI pin of the controller 300 is connected to the MISI pin of the controller 300 through a photocoupler. The controller 300 is isolated from the ADC chip 200 by a photocoupler, thereby improving the safety of the circuit. In one embodiment, the controller 300 can be a single-chip microcomputer, a PLC controller, etc.

[0029] The second end of the second protection unit 170 (fuse F1) can also be connected to the grounding resistance unit 180, and the current signal output by the sensor is made more stable through the grounding resistance unit 180. In one embodiment, the grounding resistance unit 180 includes a resistor R1; the first end of the resistor R1 is connected to the second end of the fuse F1, and the second end of the resistor R1 is grounded.

[0030] In order to filter the signal output by the sensor, the second end of the second protection unit 170 (fuse F1) can also be connected to the band-stop filter unit 190; the input end of the band-stop filter unit 190 is connected to the second protection unit 170; the output end of the band-stop filter unit 190 is connected to the ADC chip 200. In one embodiment, the band-stop filter unit 190 includes a resistor R2 and a capacitor C1; the first end of the resistor R2 is connected to the second end of the fuse F1; the second end of the resistor R2 is respectively connected to the first end of the capacitor C1 and the ADC chip 200; the second end of the capacitor C1 is grounded.

[0031] The embodiment of the present application further provides a hydrogenation machine, which includes an explosion-proof box and the above-mentioned intrinsically safe circuit 10 arranged in the explosion-proof box.

[0032] In summary, the embodiments of the present application provide an intrinsically safe circuit and a hydrogenator for data acquisition in a hydrogenation environment, comprising at least one connection port; a signal conditioning circuit connected to the connection port; an ADC chip connected to the signal conditioning circuit; the connection port comprises a power supply terminal (terminal 1 of P1), an acquisition terminal (terminal 2 of P1) and a ground terminal (terminal 3 of P1); the signal conditioning circuit 100 comprises a power supply circuit connected to the power supply terminal; an acquisition circuit connected to the acquisition terminal; the power supply circuit comprises a first protection unit connected to the power input terminal; a first voltage stabilizing unit connected to the first protection unit; a current limiting unit connected to the first voltage stabilizing unit; the current limiting unit is connected to the power supply terminal; the acquisition circuit comprises a unidirectional conduction unit connected to the acquisition terminal; a second voltage stabilizing unit connected to the unidirectional conduction unit; a second protection unit connected to the second voltage stabilizing unit; the second protection unit is connected to the ADC chip; while meeting the explosion-proof standards, the equipment cost is reduced and the volume of the hydrogenator is reduced.

[0033] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An intrinsically safe circuit for data acquisition in a hydrogenation environment, characterized in that: include: At least one connection port; a signal conditioning circuit correspondingly connected to the connection port; An ADC chip connected to the signal conditioning circuit; The connection port includes a power supply terminal, a collection terminal and a ground terminal; the signal conditioning circuit includes a power supply line connected to the power supply terminal; A collection circuit connected to the collection end; The power supply circuit includes a first protection unit connected to the power input terminal; a first voltage stabilizing unit connected to the first protection unit; a current limiting unit connected to the first voltage stabilizing unit; and the current limiting unit is connected to the power supply terminal; The acquisition circuit includes a unidirectional conducting unit connected to the acquisition end; a second voltage stabilizing unit connected to the unidirectional conducting unit; a second protection unit connected to the second voltage stabilizing unit; the second protection unit is connected to the ADC chip; the unidirectional conducting unit includes a first Schottky diode and a second Schottky diode; the anode of the first Schottky diode is connected to the acquisition end; the cathode of the first Schottky diode is connected to the anode of the second Schottky diode; the cathode of the second Schottky diode is connected to the input end of the second voltage stabilizing unit.

2. The intrinsically safe circuit according to claim 1, characterized in that: The intrinsically safe circuit also includes a DC / DC module connected to the power input terminal.

3. The intrinsically safe circuit according to claim 1, characterized in that: The intrinsically safe circuit also includes a controller connected to the ADC chip; the controller and the ADC chip are connected via a photoelectric coupler.

4. The intrinsically safe circuit according to claim 1, characterized in that: The intrinsically safe circuit further includes a grounding resistance unit connected to the second protection unit.

5. The intrinsically safe circuit according to claim 1, characterized in that: The intrinsically safe circuit further includes a band-stop filter unit; an input end of the band-stop filter unit is connected to the second protection unit; and an output end of the band-stop filter unit is connected to the ADC chip.

6. A hydrogenation machine, characterized in that: The invention comprises an explosion-proof box and the intrinsically safe circuit according to any one of claims 1 to 5 arranged in the explosion-proof box.

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