CN219304822U - Pressure acquisition, conversion and transmission circuit of helicopter emergency floating inflatable high-pressure gas cylinder - Google Patents
Pressure acquisition, conversion and transmission circuit of helicopter emergency floating inflatable high-pressure gas cylinder Download PDFInfo
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- CN219304822U CN219304822U CN202223179762.1U CN202223179762U CN219304822U CN 219304822 U CN219304822 U CN 219304822U CN 202223179762 U CN202223179762 U CN 202223179762U CN 219304822 U CN219304822 U CN 219304822U
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Abstract
The utility model discloses a helicopter emergency floating inflatable high-pressure gas cylinder pressure acquisition conversion and transmission circuit, which comprises an acquisition conversion circuit and a transmission circuit which are connected with each other; the acquisition conversion circuit at least comprises a common-mode inductor and a voltage-frequency converter which are sequentially connected, the analog voltage signal of the gas cylinder is filtered through the common-mode inductor and then output to the voltage-frequency converter, and the analog voltage signal of the gas cylinder is converted into a frequency signal by the voltage-frequency converter and is output to the transmission circuit; the transmission circuit at least comprises a triode and a photoelectric coupler which are connected in sequence, wherein a frequency signal is input into the triode, amplified by the triode and then output to the photoelectric coupler, and the photoelectric coupler isolates and outputs the amplified frequency signal. The utility model can collect the low-power voltage analog quantity output by the high-pressure gas cylinder, realize physical isolation in the signal transmission process, eliminate the interference signals of long-distance ground wire coupling, and realize synchronous output of frequency signals.
Description
Technical Field
The utility model belongs to the field of emergency rescue, and particularly relates to a helicopter emergency floating inflatable high-pressure gas cylinder pressure acquisition, conversion and transmission circuit.
Background
When a modern fight helicopter or a civil helicopter flies in a water area/sea area, once natural disasters, war destroys or self faults occur, the helicopter can topple and sink in a short time after power is lost and falls into the sea. The helicopter is matched with the high-pressure gas cylinder, so that gas can be released when the aircraft falls into water, and the buoyancy bag is inflated, so that sufficient floating capacity is provided for the helicopter, and rescue time is won. When the pressure of the gas stored in the high-pressure gas cylinder is about 30MPa and once the pressure of the gas cylinder is leaked, and the pressure cannot be monitored in real time, when an emergency helicopter needs to force the water to fall, the air pressure is insufficient, the floating bag is not inflated enough, enough floating capacity cannot be provided, and accidents can be caused.
The existing domestic civil helicopter has no water floating function, the emergency floating inflatable gas cylinder equipped with the early military helicopter monitors pressure manually, due to the limitation of the installation position and space of the gas cylinder, ground staff observes the pressure gauge equipped on the high-pressure gas cylinder through the handheld reflector, the dial scale resolution of the pressure gauge is lower, generally 2 MPa/grid, and the monitored pressure value is always a general number and can only be checked before and after flight due to the errors of manual observation. Once the gas cylinder leaks in the air, a driver cannot learn fault information and cannot return to the air in time, and emergency forced landing is encountered, so that accidents can be caused.
Disclosure of Invention
The utility model aims to provide a pressure acquisition, conversion and transmission circuit of a high-pressure gas cylinder for emergency floating inflation of a helicopter, which is used for acquiring low-power voltage analog quantity output by the high-pressure gas cylinder, enhancing signal driving capability by using a voltage conversion frequency specific circuit, realizing physical isolation in the signal transmission process by using a triode driving circuit and an optical coupler isolation circuit, eliminating interference signals of long-distance ground wire coupling and synchronously outputting frequency signals.
In order to solve the technical problems, the technical scheme of the utility model is as follows: the helicopter emergency floating inflatable high-pressure gas cylinder pressure acquisition, conversion and transmission circuit comprises an acquisition, conversion circuit and a transmission circuit which are connected with each other; the acquisition conversion circuit at least comprises a common-mode inductor and a voltage-frequency converter which are sequentially connected, the analog voltage signal of the gas cylinder is filtered through the common-mode inductor and then output to the voltage-frequency converter, and the analog voltage signal of the gas cylinder is converted into a frequency signal by the voltage-frequency converter and is output to the transmission circuit; the transmission circuit at least comprises a triode and a photoelectric coupler which are connected in sequence, wherein a frequency signal is input into the triode, amplified by the triode and then output to the photoelectric coupler, and the photoelectric coupler isolates and outputs the amplified frequency signal.
The output end of the photoelectric coupler is connected with the data processor.
The data processor is connected with a protection circuit, and a plurality of groups of low junction capacitance bidirectional TVS diode arrays SYC544CS are connected in the protection circuit.
The maximum clamp voltage of SYC544CS is set to 14.4V.
The voltage-to-frequency converter model SG131A.
The triode model is 3DK9HUA.
The model of the photoelectric coupler is GH281-4.
Compared with the prior art, the utility model has the beneficial effects that:
1) Collecting low-power voltage analog quantity output by a high-pressure gas cylinder, using a voltage conversion frequency specific circuit to enhance signal driving capability, realizing physical isolation in the signal transmission process through a triode driving circuit and an optical coupler isolation circuit, eliminating interference signals of long-distance ground wire coupling, and simultaneously realizing synchronous output of frequency signals;
2) The high-pressure gas cylinder pressure signal is uploaded to the electromechanical system of the helicopter in real time in an RS422 data format, a low-junction capacitance TVS tube with a novel technology is adopted as an interface chip data port protection circuit, a primary protection circuit is connected with a signal port and a shell, and a secondary protection circuit is connected with the signal port and a circuit ground, so that the lightning protection performance of the interface circuit is ensured, the high-speed transmission performance of communication data is ensured, and signal distortion is avoided.
Drawings
FIG. 1 is a schematic diagram of a collection and conversion circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a transmission circuit according to an embodiment of the utility model;
fig. 3 is a circuit schematic diagram of a low junction capacitance TVS interface chip data port protection circuit according to an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
The pressure signal output by the high-pressure gas cylinder is represented by analog voltage 0V-5V, in order to filter interference of on-line coupling of the analog signal in the long-distance transmission process, the common-mode inductor L16 is used for filtering the gas cylinder pressure analog voltage signal QM4, the gas cylinder analog voltage signal is precisely voltage-to-frequency converter U17 through SG131A, the analog signal is converted into frequency signal F-QM4, 3DK9HUA triode Q3 is driven, GH281-4 photoelectric coupler U8 works, isolated frequency signal F4 is output, and gas cylinder pressure V-F signal conversion and isolated transmission are achieved. The master control chip of the starting device data processor obtains an analog voltage value corresponding to the pressure of the gas cylinder through capturing the frequency f4, and utilizes a relation curve of the pressure and the voltage of the gas cylinder: y (pressure Mpa) =kX (voltage V) +B to obtain the actual pressure value (Mpa) of the gas cylinder, and uploading the gas cylinder pressure value to the electromechanical computer system of the helicopter at a rate of 500ms by a serial port of SCI-B of the main control chip.
By using the two low-junction-capacitance bidirectional TVS diode arrays SYC544CS with the novel technology, the high-speed transmission signal waveform of serial port communication data in the RS422 data format is not distorted, and the lightning protection effect is good. Two independent bidirectional TVs are arranged in SYC544CS, namely a pin 1 to pin 3 common end and a pin 2 to pin 3 common end, and the specific connection method of the circuit is as follows: pin 1 and pin 2 of a SYC544CS diode array are respectively connected with data ports A and B of an interface chip, and pin 3 is connected with a shell of the device, so that primary lightning protection is realized; pin 1 and pin 2 of another SYC544CS diode array are respectively connected with data ports A and B of the interface chip, and pin 3 is connected with GND of the chip, so that secondary lightning protection is realized. When instantaneous high-voltage lightning signals are loaded on the data port of the interface chip, larger energy is released on the shell of the device through the primary lightning protection circuit, the rest small part of energy is absorbed on the circuit GND through the secondary lightning protection circuit, the port voltage is clamped in a lower voltage range, and the clamping voltage of the SYC544CS diode array selected by the device is 14.4V to the maximum, so that the data port of the interface chip can be effectively protected.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (7)
1. The helicopter emergency floating inflatable high-pressure gas cylinder pressure acquisition, conversion and transmission circuit is characterized by comprising an acquisition, conversion circuit and a transmission circuit which are connected with each other; the acquisition conversion circuit at least comprises a common-mode inductor and a voltage-frequency converter which are sequentially connected, the analog voltage signal of the gas cylinder is filtered through the common-mode inductor and then output to the voltage-frequency converter, and the analog voltage signal of the gas cylinder is converted into a frequency signal by the voltage-frequency converter and is output to the transmission circuit; the transmission circuit at least comprises a triode and a photoelectric coupler which are connected in sequence, wherein a frequency signal is input into the triode, amplified by the triode and then output to the photoelectric coupler, and the photoelectric coupler isolates and outputs the amplified frequency signal.
2. The helicopter emergency floating inflatable high-pressure gas cylinder pressure acquisition, conversion and transmission circuit according to claim 1, wherein an output end of the photoelectric coupler is connected with the data processor.
3. The helicopter emergency floating inflatable high-pressure gas cylinder pressure acquisition, conversion and transmission circuit according to claim 2, wherein the data processor is connected with a protection circuit, and a plurality of groups of low-junction capacitance bidirectional TVS diode arrays SYC544CS are connected in the protection circuit.
4. A helicopter emergency floating inflation high-pressure gas cylinder pressure acquisition conversion and transmission circuit as claimed in claim 3, wherein the maximum clamping voltage of SYC544CS is set to 14.4V.
5. The helicopter emergency floating inflation high-pressure gas cylinder pressure acquisition, conversion and transmission circuit of claim 1, wherein the voltage-to-frequency converter is SG131A.
6. The helicopter emergency floating inflation high-pressure gas cylinder pressure acquisition, conversion and transmission circuit of claim 1, wherein the triode model is 3DK9HUA.
7. The helicopter emergency floating inflation high-pressure gas cylinder pressure acquisition, conversion and transmission circuit according to claim 1, wherein the photoelectric coupler is GH281-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223179762.1U CN219304822U (en) | 2022-11-29 | 2022-11-29 | Pressure acquisition, conversion and transmission circuit of helicopter emergency floating inflatable high-pressure gas cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223179762.1U CN219304822U (en) | 2022-11-29 | 2022-11-29 | Pressure acquisition, conversion and transmission circuit of helicopter emergency floating inflatable high-pressure gas cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219304822U true CN219304822U (en) | 2023-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223179762.1U Active CN219304822U (en) | 2022-11-29 | 2022-11-29 | Pressure acquisition, conversion and transmission circuit of helicopter emergency floating inflatable high-pressure gas cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219304822U (en) |
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2022
- 2022-11-29 CN CN202223179762.1U patent/CN219304822U/en active Active
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