CN217868125U - Isolating circuit, oiling machine oil gas recovery monitoring system and oiling machine - Google Patents
Isolating circuit, oiling machine oil gas recovery monitoring system and oiling machine Download PDFInfo
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- CN217868125U CN217868125U CN202221311390.0U CN202221311390U CN217868125U CN 217868125 U CN217868125 U CN 217868125U CN 202221311390 U CN202221311390 U CN 202221311390U CN 217868125 U CN217868125 U CN 217868125U
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Abstract
The application relates to an isolated circuit, tanker aircraft vapor recovery monitoring system and tanker aircraft, this isolated circuit is used for zener formula safety barrier, and isolated circuit includes: the power isolation module is used for electrically isolating a power supply and the Zener type safety barrier, and the signal isolation module is used for electrically isolating a pulse signal between an external system and the Zener type safety barrier. The isolation circuit provided by the embodiment of the application can realize the electrical isolation between the Zener type safety barrier and a power supply and between the Zener type safety barrier and an external system.
Description
Technical Field
The application relates to the technical field of electronics, in particular to an isolating circuit, an oiling machine oil gas recovery monitoring system and an oiling machine.
Background
The zener barrier is an energy limiter consisting of a fast fuse, a current limiting resistor or a voltage limiting diode. For playing explosion-proof safety protection effect during the use of zener formula safety barrier, the mounted position must have very reliable ground system, but zener formula safety barrier ground terminal meets back signal with the ground and will can't correctly convey to because signal ground, directly reduce signal interference killing feature, influence system stability. In addition, the zener type safety barrier has a large influence on the power supply, and is also easily damaged due to the fluctuation of the power supply.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the prior art, this application has proposed an isolated circuit, tanker aircraft vapor recovery monitoring system and tanker aircraft. The isolation circuit that this application embodiment provided can realize the isolation of power and zener formula safety barrier through set up the power isolation module between power and zener formula safety barrier circuit, in addition, sets up signal isolation module between zener formula safety barrier and external system, can realize the signal isolation between external system and the zener formula safety barrier, guarantees the stability of external system and power work.
The application provides an isolating circuit, its characterized in that, isolating circuit are used for zener formula safety gate, and isolating circuit includes: the power isolation module is used for electrically isolating a power supply and the Zener type safety barrier, and the signal isolation module is used for electrically isolating a pulse signal between an external system and the Zener type safety barrier; the power isolation module comprises a power isolation element, the input end of the power isolation element is connected with a power supply, and the output end of the power isolation element is electrically connected with the input end of the Zener type safety gate; the signal isolation module comprises an optical coupling element and a field effect transistor, wherein the anode of the output end of the optical coupling element is connected with the input end of an external system circuit, the cathode of the input end of the optical coupling element is connected with the drain electrode of the field effect transistor, the source electrode of the field effect transistor is grounded, and the grid electrode of the field effect transistor is electrically connected with the input end of the Zener type safety grid.
Optionally, a power isolation element is used for power isolation between the power output terminal 24V voltage to the zener-type safety gate input terminal 5V voltage.
Optionally, the power isolation module further includes a first indicator light, an anode of the first indicator light is electrically connected to the input terminal of the power isolation module, and a cathode of the first indicator light is grounded.
Optionally, the power isolation module further comprises a second indicator light, an anode of the second indicator light is electrically connected to the output end of the power isolation module, and a cathode of the second indicator light is grounded.
Optionally, the power isolation module further includes a capacitor filter circuit, a first input end of the capacitor filter circuit is electrically connected to the positive output end of the power supply, and a second input end of the capacitor filter circuit is grounded.
Optionally, the power isolation module further includes an overcurrent protector electrically connected between the positive output terminal of the power supply and the power isolation element, and configured to turn off when the current at the positive output terminal of the power supply is greater than a preset current threshold.
Optionally, the power isolation module further includes a rectifier diode, an anode of the rectifier diode is electrically connected to the positive output terminal of the power supply, and a cathode of the rectifier diode is electrically connected to the input terminal of the power isolation element.
Optionally, the power isolation module further includes a zener diode, an anode of the zener diode is grounded, and a cathode of the zener diode is electrically connected to the positive output terminal of the power supply and is configured to be turned on when the voltage of the positive output terminal of the power supply is greater than the preset voltage threshold.
The embodiment of this application still provides an tanker aircraft vapor recovery monitoring system, tanker aircraft vapor recovery monitoring system is based on aforementioned arbitrary the isolated circuit, tanker aircraft vapor recovery monitoring system includes: the gas flowmeter comprises a control system, a power supply and a gas flowmeter, wherein the control system is electrically connected with a signal isolation module in an isolation circuit, and the signal isolation module is used for electrically isolating the control system; the power supply is electrically connected with a power supply isolation module in the isolation circuit, and the power supply isolation module is used for electrically isolating the power supply; the gas flow meter is connected with a Zener type safety grid in the isolation circuit.
The embodiment of the application also provides the fuel dispenser, which comprises the isolation circuit of any one of the above parts.
The isolating circuit that this application embodiment provided is applied to zener formula safety barrier, through set up power module between power and zener formula safety barrier circuit, sets up signal isolation module between external system and zener formula safety barrier to this keeps apart the interference that zener formula safety barrier brought, and then has guaranteed the stability of power and external system work.
Drawings
Preferred embodiments of the present application will now be described in further detail with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an isolation circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit structure diagram of a power isolation module in an isolation circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit structure diagram of a signal isolation module in an isolation circuit according to an embodiment of the present application;
fig. 4 is a schematic diagram of a circuit structure of a zener type safety gate portion according to an embodiment of the present application;
figure 5 is a schematic structural diagram of an oil and gas recovery detection system of a fuel dispenser according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the following detailed description, reference is made to the accompanying drawings that form a part hereof and in which is shown by way of illustration specific embodiments of the application. In the drawings, like numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized and structural, logical or electrical changes may be made to the embodiments of the present application.
Fig. 1 is a schematic structural diagram of an isolation circuit according to an embodiment of the present disclosure. As shown in fig. 1, an isolation circuit 100 is used for the zener type safety gate 103. The isolation circuit 100 includes: the power isolation module 102 is used for electrically isolating the power supply 101 from the zener safety barrier 103, and the signal isolation module 104 is used for electrically isolating the pulse signal between the external system 105 and the zener safety barrier 103. The input end of the power isolation module is connected with the power supply, and the output end of the power isolation module is connected with the input end of the Zener type safety barrier. The input end of the signal isolation module is connected with the output end of the Zener type safety grid, and the output end of the signal isolation module is connected with an external system.
Fig. 2 is a schematic circuit structure diagram of a power isolation module in an isolation circuit according to an embodiment of the present disclosure. As shown in fig. 2, the power isolation module 102 includes a power isolation element 201, an input terminal of the power isolation element 201 is connected to the power source 101, and an output terminal of the power isolation element 201 is electrically connected to an input terminal of the zener-type safety barrier. The input end of the power isolation element 201 is connected to the positive electrode of the power supply, and the output end is connected to the input end of the zener-type safety barrier through the output end M1 of the circuit. In some embodiments, the power isolation element may optionally be a DC-DC power isolation element of type IF2405S-1W (U1). The embodiment of the application does not limit the specific type and type of the power isolation element, as long as the requirement of power isolation can be met. The power isolation element needs to be selected taking into account the input of the power supply voltage, the isolation requirements between the input and the output, the regulation requirements for the output voltage, etc. The power isolation element in the embodiment of the present application may make a suitable selection of the type and type of the isolation element according to the voltage of the specific input power and the output voltage of the power isolation module.
Fig. 3 is a schematic circuit structure diagram of a signal isolation module in an isolation circuit according to an embodiment of the present disclosure. As shown in fig. 3, the signal isolation module 104 includes an optical coupling element U1 and a field effect transistor Q1, an anode of an output end of the optical coupling element U1 is connected to a circuit input end of the external system 105, a cathode of an input end of the optical coupling element U1 is connected to a drain D of the field effect transistor Q1, a source S of the field effect transistor is grounded, and a gate G of the field effect transistor is electrically connected to an input end of the zener-type safety gate. The optocoupler U1 is a conversion device, realizes the isolation of a front stage input end and a rear stage output end through the conversion process from electricity to light and then to electricity, and can also play a role in protecting an external system circuit. The optocoupler U1 encapsulates the light emitting diode and the phototriode together, the light emitting diode is an input end, and the phototriode is an output end. The Zener type safety barrier is electrically connected with the input end of the optocoupler, so that interference signals generated by grounding of the Zener type safety barrier cannot interfere with an external system. The pulse signal is a digital signal, and the gate G controls whether the drain D and the source S are turned on or off according to the input pulse signal. When the drain D and the source S are conducted, a light emitting diode in the optocoupler U1 is conducted, electrical signals are converted into optical signals, and the optical signals are converted into electrical signals through the phototriode and then input into an external system. Therefore, in the signal isolation module, the optical coupler is used for realizing the electrical isolation of the input signal, and the field effect transistor is used for controlling whether the cathode at the input end of the optical coupler is grounded.
The isolating circuit that this application embodiment provided is applied to zener formula safety barrier, through set up power module between power and zener formula safety barrier circuit, sets up signal isolation module between external system and zener formula safety barrier to this keeps apart the interference that zener formula safety barrier brought, and then has guaranteed the stability of power and external system work.
In some embodiments, optionally, the power isolation element 201 is used for power isolation between the power output terminal 24V voltage to the zener-type safety barrier input terminal 5V voltage. In a specific implementation circuit, components such as resistors are required to be connected between an input power supply and the power isolation element and between the power isolation element and the zener type safety gate circuit according to the requirements of the input and output terminal voltages of the power isolation element.
Referring to fig. 2, as shown in fig. 2, the power isolation module 102 further includes a first indicator light D1, an anode of the first indicator light D1 is electrically connected to the input terminal of the power isolation module, and a cathode of the first indicator light D1 is grounded. The first indicator light D1 can be a light emitting diode, and when the power supply voltage at the input end of the power supply isolation module meets a first preset voltage value, the first indicator light D1 emits light to indicate that the power supply isolation module works normally; when power isolation module input mains voltage does not satisfy first default voltage value, first pilot lamp D1 is luminous, instructs power isolation module unable normal work, and at this moment, the staff can investigate the circuit, in time discovers the problem, solves the potential safety hazard. Wherein, the first preset voltage value may be 24V. The first indicator light is connected in series with a first resistor R21 for limiting the current through the first indicator light. In some embodiments, the first resistor R21 has a resistance of 1 kilo ohms.
In some embodiments, optionally, the power isolation module 102 further includes a second indicator light D2, an anode of the second indicator light D2 is electrically connected to the output terminal of the power isolation module, and a cathode of the second indicator light is grounded. And the second indicator light D2 is used for indicating whether the voltage connected with the output end of the power isolation module meets a second preset voltage value. When the anode voltage of the second indicator light D2 meets a second preset voltage value, the second indicator light D2 emits light to indicate that the voltage connected to the output end of the power isolation module is normal; when the anode voltage of the second indicator light D2 does not meet the second preset voltage value, the second indicator light D2 does not emit light, and the output end of the power isolation module is indicated to be abnormally connected with voltage. Because the access voltage is the operating voltage of zener formula safety barrier circuit, the staff can investigate zener formula safety barrier circuit or power isolation module's circuit in view of the above, in time discovers the problem, solves the potential safety hazard. Wherein, the second preset voltage value may be 5V. In addition, to limit the current in the second indicator light, a second resistor R23 is connected in series with the second indicator light D2. In some embodiments, the resistance of the second resistor R23 is 5100 ohms.
As shown in fig. 2, the power isolation module 102 further includes a capacitor filter circuit, a first input end of the capacitor filter circuit is electrically connected to the positive output end of the power supply, and a second input end of the capacitor filter circuit is grounded. The capacitor filter circuit is connected to the power isolation module, and includes a third capacitor C3, a second capacitor C2, and a first capacitor C1, where in some embodiments, optionally, a capacitance value of the third capacitor C3 is smaller than a capacitance value of the second capacitor C2, specifically, a capacitance value of the third capacitor C3 may be 4.7uF, and a capacitance value of the second capacitor C2 may be 105F. The third capacitor C3 is used to filter out the signal with a relatively low frequency, and the second capacitor C2 is used to filter out the signal with a relatively high frequency, the frequency of the signal passing through being the section between the two capacitors. The first capacitor C1 is connected in parallel to the output end of the power isolation module, and the third resistor R22 is connected in parallel to two ends of the first capacitor C1, and is used for discharging the electric energy at two ends of the first capacitor C1. The capacitance of the first capacitor C1 may be 104F, and the resistance of the third resistor R22 may be 256 ohms.
The power isolation module circuit further comprises an overcurrent protector F7, wherein the overcurrent protector F7 is electrically connected between the positive output end of the power supply 101 and the power isolation element and is used for being turned off when the current of the positive output end of the power supply is greater than a preset current threshold value. The overcurrent protector is connected at the input end of the power isolation module and used for protecting the circuit of the power isolation module, when the current connected into the power isolation module is higher than the protection current of the overcurrent protector F7, the overcurrent protector is disconnected, an electric device in the power isolation module cannot be damaged, and electricity utilization danger can be prevented to a certain extent.
In some embodiments, optionally, the power isolation module further includes a rectifying diode D3, an anode of the rectifying diode D3 is electrically connected to the positive power output terminal, and a cathode of the rectifying diode is electrically connected to the input terminal of the power isolation element. And the anode of the rectifier diode D3 is connected to the input end of the power isolation module. When the power supply connected to the power supply isolation module is alternating current, the alternating current is converted into direct current by using the rectifier diode D3.
Referring to fig. 2, as shown in fig. 2, the power isolation module 102 further includes a zener diode D4, an anode of the zener diode D4 is grounded, and a cathode of the zener diode D4 is electrically connected to the positive output end of the power supply, and is configured to be turned on when the voltage at the positive output end of the power supply is greater than the preset voltage threshold. The zener diode D4 plays a role in stabilizing voltage in the circuit, and after the zener diode is reverse-broken down, the reverse voltage does not change with respect to the reverse current within a certain reverse current range.
In addition, resistors can be reasonably configured in the circuits of the power isolation module and the signal isolation module according to the current or voltage requirements of other electronic devices in the circuits, as shown in fig. 2, the first resistor R21 and the second resistor R23 are protection resistors of the light emitting diode, and the third resistor R22 is a protection resistor of the output end of the power isolation module. As shown in fig. 3, the fourth resistor R31, the fifth resistor R32, and the sixth resistor R33 are connected according to a voltage requirement for connecting the electronic component. In the signal isolation module circuit module provided in the embodiment of the present application, the fourth resistor R31 may be 10 ten thousand ohms, the fifth resistor R32 may be 1000 ohms, and the sixth resistor R33 may be 10 ten thousand ohms.
In order to describe the isolation circuit in detail, which is proposed in the embodiment of the present application, the isolation circuit will be described in conjunction with a zener type safety gate circuit, and fig. 4 is a schematic diagram of a circuit structure of a zener type safety gate portion which is proposed in the embodiment of the present application. In the zener type safety barrier, a plurality of circuits as shown in fig. 4 are packaged. With reference to fig. 2, 3 and 4, a circuit output end M1 of the power isolation module circuit is connected to a first access end M3 of the zener barrier circuit. The input end M2 of the signal isolation module is connected with a second access end M6 of the Zener type guard gate circuit; an access terminal M5 of the signal isolation module can be accessed to another first access terminal M3 of the zener barrier circuit. In some embodiments, optionally, a connector is provided between the power isolation module and the zener barrier circuit, and the terminals of the power isolation module and the signal isolation module may be connected to the circuit access terminal in the zener barrier through the connector. And a third access end M4 and a fourth access end M7 which are not connected with the power isolation module or the signal isolation module in the Zener type safety gate circuit are connected with the gas flowmeter through another connector.
The application still provides an tanker aircraft vapor recovery system detecting system. Figure 5 is a schematic structural diagram of an oil and gas recovery detection system of a fuel dispenser according to an embodiment of the present application. As shown in fig. 5, the tanker aircraft vapor recovery monitoring system 500 is based on isolated electrical circuits as previously described, the tanker aircraft vapor recovery monitoring system 500 comprising: a control system 501, a power supply 101, and a gas flow meter 502. The control system 501 is electrically connected to the signal isolation module 104 in the isolation circuit, and the signal isolation module 104 is used for electrical isolation of the control system.
The power supply 101 is electrically connected to a power isolation module 102 in the isolation circuit, which is used for electrical isolation of the power supply. The gas meter 502 is connected to a zener-type safety barrier in the isolation circuit.
Because the particularity of tanker aircraft oil gas detection system work, explosion-proof requirement need be considered, for this reason, need use zener formula safety barrier among the tanker aircraft oil gas recovery system, however, because zener formula safety barrier ground connection can produce the interference to control system, so, tanker aircraft oil gas recovery system that this application embodiment provided utilizes isolation circuit, set up electrical isolation module between zener formula safety barrier and power and between zener formula safety barrier and control system, realize the electrical isolation with zener formula safety barrier for oil gas recovery detection system can stabilize normal work.
The embodiment of the application also provides the fuel dispenser, which comprises the isolating circuit. In some embodiments, optionally, an oil gas recovery monitoring system is arranged in the oiling machine, in the oil gas recovery monitoring system, the gas flow meter is in an unsafe area, according to explosion-proof requirements, a zener safety barrier is required to be used by a control system in the oiling machine, and by using the isolation circuit provided by the embodiment of the application, the electrical isolation among the control system, the power supply and the zener safety barrier can be realized, so that the oiling machine can stably work.
The above-described embodiments are provided for illustrative purposes only and are not intended to limit the present disclosure, and those skilled in the art can make various changes and modifications without departing from the scope of the present disclosure, and therefore, all equivalent technical solutions should fall within the scope of the present disclosure.
Claims (10)
1. An isolation circuit for a zener-type safety barrier, the isolation circuit comprising: a power supply isolation module and a signal isolation module,
the power isolation module is used for electrical isolation between the power supply and the Zener type safety barrier,
the signal isolation module is used for electrically isolating the pulse signal between an external system and the Zener type safety barrier; wherein, the first and the second end of the pipe are connected with each other,
the power isolation module comprises a power isolation element, the input end of the power isolation element is connected with a power supply, and the output end of the power isolation element is electrically connected with the input end of the Zener type safety gate;
the signal isolation module comprises an optical coupling element and a field effect transistor, wherein the anode of the output end of the optical coupling element is connected with the input end of an external system circuit, the cathode of the input end of the optical coupling element is connected with the drain electrode of the field effect transistor, the source electrode of the field effect transistor is grounded, and the grid electrode of the field effect transistor is electrically connected with the input end of the Zener type safety grid.
2. The isolation circuit of claim 1, wherein the power isolation element is used for power isolation between a power output terminal voltage of 24V to a zener-type safety gate input terminal voltage of 5V.
3. The isolation circuit of claim 1, wherein the power isolation module further comprises a first indicator light, wherein an anode of the first indicator light is electrically connected to the input terminal of the power isolation module, and wherein a cathode of the first indicator light is grounded.
4. The isolation circuit of claim 1, wherein the power isolation module further comprises a second indicator light, an anode of the second indicator light being electrically connected to the output of the power isolation module, and a cathode of the second indicator light being grounded.
5. The isolation circuit of claim 1, wherein the power isolation module further comprises a capacitive filter circuit, a first input terminal of the capacitive filter circuit is electrically connected to the positive power output terminal, and a second input terminal of the capacitive filter circuit is grounded.
6. The isolation circuit of claim 1, wherein the power isolation module further comprises an over-current protector electrically connected between the positive output terminal of the power supply and the power isolation element for turning off when the current at the positive output terminal of the power supply is greater than a predetermined current threshold.
7. The isolation circuit of claim 1, wherein the power isolation module further comprises a rectifying diode, an anode of the rectifying diode is electrically connected to the positive output terminal of the power supply, and a cathode of the rectifying diode is electrically connected to the input terminal of the power isolation element.
8. The isolation circuit of claim 1, wherein the power isolation module further comprises a zener diode, an anode of the zener diode is grounded, and a cathode of the zener diode is electrically connected to the positive power output terminal for conducting when a voltage at the positive power output terminal is greater than a predetermined voltage threshold.
9. A fuel dispenser vapor recovery monitoring system, the fuel dispenser vapor recovery monitoring system being based on the isolated electrical circuit of any of claims 1-8, the fuel dispenser vapor recovery monitoring system comprising: a control system, a power supply, and a gas flow meter, wherein,
the control system is electrically connected with a signal isolation module in the isolation circuit, and the signal isolation module is used for electrical isolation of the control system;
the power supply is electrically connected with a power supply isolation module in the isolation circuit, and the power supply isolation module is used for electrically isolating the power supply;
the gas flow meter is connected with a Zener type safety grid in the isolation circuit.
10. A fuel dispenser, characterized in that it comprises an isolated electrical circuit as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221311390.0U CN217868125U (en) | 2022-05-23 | 2022-05-23 | Isolating circuit, oiling machine oil gas recovery monitoring system and oiling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221311390.0U CN217868125U (en) | 2022-05-23 | 2022-05-23 | Isolating circuit, oiling machine oil gas recovery monitoring system and oiling machine |
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| Publication Number | Publication Date |
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| CN217868125U true CN217868125U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221311390.0U Active CN217868125U (en) | 2022-05-23 | 2022-05-23 | Isolating circuit, oiling machine oil gas recovery monitoring system and oiling machine |
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| CN (1) | CN217868125U (en) |
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