Maritime satellite fan alarm system and method

Abstract

The invention provides a maritime satellite fan alarm system and method, and belongs to the technical field of fan alarm, the maritime satellite fan alarm system comprises a controller and an indication assembly, the controller is connected with the indication assembly, and the controller comprises a Hall element, a logic control module and a power supply module; the Hall element is used for sensing current change in a maritime satellite fan power supply loop to obtain a current signal and converting the current signal into a voltage signal, the logic control module processes and judges the voltage signal and outputs a detection result of the working state of the fan, and the working state of the fan is displayed through the indication assembly. And when the working state of the fan exceeds the set threshold value, an alarm is given, independent work can be achieved, the inspection basis is provided for maintenance personnel, and the fan has the advantage of being installed under the condition that the internal structure and external connection of original equipment are not damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of fan alarms, and in particular relates to a maritime satellite fan alarm system and method. Background Art

[0002] The maritime satellite system installed on the Boeing 737 aircraft has a design defect. When the maritime satellite fan fails, the aircraft is not designed with a related alarm function, which causes the maritime satellite to overheat and be damaged for a long time, affecting the normal operation of the aircraft. The present invention realizes the monitoring of the operating status of the maritime satellite fan without destroying the aircraft structure by designing a set of signal acquisition, processing and indication systems, thereby avoiding overheating failures of the aircraft maritime satellite system.

[0003] Aircraft equipment, including electronic equipment, CRT, instrument panels, etc., is cooled by electronic equipment ventilation computers, which control valves and blowers by receiving system status information provided by pressure, flow and temperature sensors and valves in the system and data provided by related computers such as cabin pressurization controllers. The signals generated by the pressure, flow and temperature sensors and valves are processed by computer logic. When the signals do not conform to normal logic, the computer outputs a fault signal. The above system is limited to the original configuration area of ​​the aircraft, and the implementation process is complex, involving multiple sensors, and cannot provide overheating warnings for electronic equipment that is not within the monitoring range.

[0004] The existing technology mainly obtains various data in the air duct by collecting pressure, flow, temperature, and valve position signals. For optional equipment, if the installation location is not in the air duct area, a cooling fan needs to be installed separately. For such equipment, if there is no miniaturized alarm system, once the heat dissipation fails, the equipment will face the risk of overheating and damage, and the flight safety of the aircraft will be affected. Summary of the invention

[0005] The present invention aims at solving the problems in the prior art, and the technical solution adopted in this application is as follows: In the first aspect, the present invention provides a maritime satellite fan alarm system, including: a controller and an indication component, the controller is connected to the indication component, the controller includes a Hall element, a logic control module and a power supply module; the Hall element is used to sense the current change in the maritime satellite fan power supply circuit to obtain a current signal, and convert the current signal into a voltage signal, the logic control module processes and judges the voltage signal, outputs the detection result of the fan working status, displays the fan working status through the indication component, and alarms when the fan working status exceeds a set threshold.

[0006] Furthermore, the controller is installed on the existing equipment rack of E6 without the need for additional drilling. The controller is used to process different status signals of the fan and convert them into different indication states through signal processing and output them to the output component.

[0007] Furthermore, the power supply module of the controller adopts AC / DC: an AC / DC design with excellent electromagnetic compatibility characteristics is used to provide a reliable DC power supply for the controller, and an AC power supply with the same source as the SDU fan is used to ensure the reliability of logic parameters.

[0008] Furthermore, the Hall element of the controller: the SDU fan loop current can be accurately converted into a voltage signal by using the Hall element, and provided to the logic control module for judgment.

[0009] Furthermore, the logic control module of the controller receives the voltage signal provided by the Hall sensor and makes a judgment through a logic judgment circuit. The judgment logic is as follows: The judgment is made 30-60 seconds after the system starts to avoid misjudgment caused by unstable inrush current at the moment of SDU fan startup; When the SDU fan fails to start, such as being stuck, the system can output a warning signal to the output component; When the SDU fan starts normally, but the workload increases beyond the manual requirements due to wear and contamination, the system can output a warning signal to the output component; When the SDU fan operates normally and the operating parameters meet the requirements of the manual, the system outputs a normal signal to the output component.

[0010] Furthermore, the indicating assembly is installed on the square hole of the left side wall panel of the cargo hold entrance. Only one 23.5mm*28.5mm square hole needs to be opened in advance on the left side wall panel. The left side wall panel is made of composite material, and the hole in the composite material is easy to restore.

[0011] The indicator component provides two indication modes. The green light is on when working normally; the yellow light is on when the SDU fan fails or the parameters are out of tolerance, and the yellow light will continue to be on as long as the SDU fan fails or the parameters are out of tolerance after the aircraft is powered on. The indicator component uses a curved lens to diffusely reflect the light.

[0012] Furthermore, the indication component is installed on the left side wall panel of the cargo hold entrance; the indication component consists of a flame-retardant shell and two circuit boards, which are used to receive output signals provided by the control component, and the input board and the output board can provide two sets of indication functions that backup each other.

[0013] Furthermore, the controller also includes a filtering module, a power correction module, a low voltage protection module, a pulse conversion module and an overcurrent protection module; The filter module uses common-mode inductors L1, L2 and L6, L7, and capacitors C2 and C3 to suppress common-mode interference for the power input. The series-mode inductors L5, L9 and capacitors C8, C9, C10 form an EMI network to suppress series-mode interference for the high-voltage output DC. The power correction module uses the chip UC2854BDW to achieve power factor correction; The low voltage protection module is composed of a low voltage detection network consisting of T3, U8, and Q7. When the power factor correction output is abnormal, the T2 input is inhibited to achieve the low voltage protection function; The pulse conversion module includes a pulse transformer T2, which is used to convert the high-voltage pulse after power factor correction into a stable 28VDC; The overcurrent protection module is composed of a control network consisting of comparator AR4 and resistors R71, R81, and R73. When the input current exceeds the set threshold, the VDDA voltage increases, and the AR4-4 voltage increases. When it is higher than the voltage at the AR4-5 terminal, the AR4-2 output is low, which inhibits the operation of the subsequent circuit and cuts off the output to achieve overcurrent protection.

[0014] In a second aspect, the present invention provides a working method of the maritime satellite fan alarm system as described in the first aspect, comprising: The Hall element of the controller senses the current change in the power supply circuit of the maritime satellite fan to obtain the current signal, and converts the current signal into a voltage signal. The logic control module processes and judges the voltage signal, outputs the detection result of the fan working status, displays the fan working status through the indicator component, and issues an alarm when the fan working status exceeds the set threshold.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are: The present invention adopts an independently working maritime satellite fan alarm system, uses the same power source as the monitored system, collects loop current signals, converts the current signals into voltage signals, processes and judges by the logic control module, outputs the detection results, and displays them by the indicator component, providing inspection basis for maintenance personnel. The invention has the characteristics of being installed without destroying the internal structure and external connection of the original equipment, which is extremely important in the modification of civil aircraft and is of great significance to ensuring flight safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a structural schematic diagram of the controller of the present invention; Figure 2 is an external schematic diagram of a controller of the present invention; Figure 3is an external schematic diagram of the indicator assembly of the present invention; Figure 4 It is a structural schematic diagram of the indicating component of the present invention; Figure 5 It is a schematic diagram of installation and observation of the indicator assembly of the present invention; Figure 6 A schematic diagram for observing the end-user use of the present invention; Figure 7 It is a schematic diagram of the installation of the maritime satellite fan controller of the present invention; Figure 8 It is an internal circuit block diagram of the maritime satellite fan alarm system of the present invention; Fig. 9 A system wiring diagram of a maritime satellite fan alarm system of the present invention; Fig.10 A diagram of the lower left area of ​​the first circuit of the maritime satellite fan alarm system of the present invention; Fig.11 It is a lower right area diagram of the first circuit diagram of the maritime satellite fan alarm system of the present invention; Fig.12 It is an upper left area diagram of a first circuit diagram of a maritime satellite fan alarm system of the present invention; Fig.13 It is an upper right area diagram of the first circuit diagram of the maritime satellite fan alarm system of the present invention; Fig.14 It is an upper area diagram of a second circuit diagram of a maritime satellite fan alarm system of the present invention; Fig.15 A lower area diagram of a second circuit diagram of a maritime satellite fan alarm system of the present invention; Fig.16 It is an upper area diagram of the third circuit diagram of the maritime satellite fan alarm system of the present invention; Fig.17 A lower area diagram of a third circuit diagram of a maritime satellite fan alarm system of the present invention; Fig.18 It is the upper left area diagram of the fourth circuit diagram of the maritime satellite fan alarm system of the present invention; Fig.19 It is the upper right area diagram of the fourth circuit diagram of the maritime satellite fan alarm system of the present invention; Fig. 20 A diagram of the lower left area of ​​a fourth circuit diagram of the maritime satellite fan alarm system of the present invention; Fig.21 A diagram of the lower right area of ​​a fourth circuit diagram of the maritime satellite fan alarm system of the present invention; Among them: 1. Power supply module (AC / DC); 2. Logic control module; 3. Hall element; 4. Output board; 5. Input board; 6. Quick-release screws; 7. Indicator component; 8. Control component; 9. SDU fan; 10. SDU fan base (SDU FAN, located at the bottom of the SDU). DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0020] Embodiment 1, as Figure 1 to Figure 21 As shown, this embodiment provides a maritime satellite fan alarm system, including: a controller and an indication component, the controller is connected to the indication component, and the controller includes a Hall element, a logic control module and a power supply module; The controller senses the current change in the power supply circuit of the maritime satellite fan through the Hall element to obtain the current signal, and converts the current signal into a voltage signal. The logic control module processes and judges the voltage signal, outputs the detection result of the fan working status, displays the fan working status through the indicator component, and issues an alarm when the fan working status exceeds the set threshold.

[0021] The system adopts an independently working maritime satellite fan alarm system, uses the same power supply as the monitored system, collects loop current signals, converts the current signals into voltage signals, and processes and judges them by the logic control module, outputs the test results, and displays them by the indicator component, providing inspection basis for maintenance personnel. The invention has the characteristics of not destroying the internal structure and external connection of the original equipment, which is extremely important in the modification of civil aircraft and is of great significance to ensuring flight safety.

[0022] The controller is installed on the existing E6 equipment rack without the need for additional drilling. The controller is used to process different status signals of the fan and convert them into different indication states through signal processing and output them to the output components.

[0023] The power supply module of the controller adopts AC / DC: it uses AC / DC design with excellent electromagnetic compatibility characteristics to provide reliable DC power supply for the controller, and uses the same AC power supply as the SDU fan to ensure the reliability of logic parameters.

[0024] Hall element of the controller: The Hall element can be used to accurately convert the SDU fan circuit current into a voltage signal and provide it to the logic control module for judgment.

[0025] The logic control module of the controller receives the voltage signal provided by the Hall sensor and makes a judgment through the logic judgment circuit. The judgment logic is as follows: The judgment is made 30-60 seconds (adjustable) after the system is started to avoid misjudgment caused by unstable impact current at the moment of SDU fan startup.

[0026] When the SDU fan fails to start, such as being stuck, the system can output a warning signal to the output component.

[0027] When the SDU fan starts normally, but the workload increases beyond the manual requirements due to wear, contamination, etc., the system can output a warning signal to the output component.

[0028] When the SDU fan operates normally and the operating parameters meet the requirements of the manual, the system outputs a normal signal to the output component.

[0029] When the control component fails completely, the output component does not work, but it will not affect the normal operation of the SDU fan; see the logic control table for details:

[0030] The indicator assembly is installed on the square hole of the left wall plate of the cargo hold entrance. The left wall plate can be set with a 23.5mm*28.5mm square hole. The left wall plate is made of composite materials. Composite materials have the characteristics of light weight and high strength. It is easy to open the hole using specific equipment. The hole structure is stable and easy to repair. The indicator assembly includes an output plate, an input plate and quick-release screws. The quick-release screws are used to install the indicator assembly into the square hole. The input plate is used to receive signals, and the output plate is used to output alarms.

[0031] The indicator component can provide 2 indication modes. When working normally, the green light is on; when the SDU fan fails or the parameters are out of tolerance, the yellow light is on, and as long as the SDU fan fails or the parameters are out of tolerance after the aircraft is powered on, the yellow light will continue to be on (optionally red). The indicator component uses a curved lens to diffusely reflect the light, which is eye-catching but not glaring.

[0032] The indicator component is installed on the left wall panel of the cargo hold entrance. Maintenance personnel can stand at the cargo hold door and observe directly without entering the cargo hold, which will not increase the workload of maintenance personnel. Airlines can modify the pre-flight inspection work card according to their own situation and conduct a visual inspection of the area. The inspection can be completed in just a few seconds.

[0033] Indicator assembly: It consists of a flame-retardant housing and two circuit boards, which are used to receive the output signal provided by the control assembly. The input board and the output board can provide two sets of indication functions for mutual backup, with a theoretical service life of more than 100,000 hours. For details, see the indicator assembly working status table:

[0034] The controller also includes a filter module, a power correction module, a low voltage protection module, a pulse conversion module and an overcurrent protection module. The module functions are described in detail: Filter module EMI FILTER: In order to meet the requirements of aviation EMC electromagnetic compatibility, this product has an EMI filter design. Common-mode inductors L1 and L6 are used to suppress common-mode interference of power supply input. When common-mode interference current flows through L6 and L1, due to the isotropic nature of the common-mode interference current, isotropic magnetic fields will be generated in the coils of L6 and L1, thereby increasing the inductive reactance of the coils, making the coils appear as high impedance, attenuating the common-mode interference current, and achieving the purpose of suppressing common-mode interference; differential-mode inductors L2 and L7 are used to suppress differential-mode interference of power supply input. L2, L7 and C3 form a series circuit. Since L2 and L7 have large inductive reactance to differential-mode high-frequency interference, and X capacitor C3 has small capacitive reactance to high-frequency interference, differential-mode interference noise is filtered out, achieving the purpose of suppressing differential-mode high-frequency interference noise; similarly, differential-mode inductors L5, L9 and capacitors C8, C9, C10 form an EMI network to suppress differential-mode interference for high-voltage output DC.

[0035] Power correction module POWER FACTOER CORRECTION: This product uses the chip UC2854BDW to achieve power factor correction, reduce reactive current, and improve circuit efficiency. The chip contains a voltage amplifier, an analog multiplier / divider, a current amplifier, and a fixed-frequency PWM. In addition, it also contains a gate driver compatible with power MOSFET, a 7.5V reference, a line predictor, a load enable comparator, a low power detector, and an overcurrent comparator. The high reference voltage (U2-8) and high oscillator amplitude (U2-16) of the chip greatly reduce noise sensitivity, and have a lower startup current, reducing the burden on the power supply circuit.

[0036] Low voltage protection module UVLO DETECT: The low voltage detection network composed of T3, U8, and Q7 can inhibit T2 input when the power factor correction output is abnormal (low) to achieve low voltage protection function.

[0037] Pulse conversion module HIGH DC / DC: Pulse transformer T2 is used to convert the high voltage pulse (220VDC) after power factor correction into a stable 28VDC.

[0038] Overcurrent protection module CURRENT LIMIT: A control network composed of comparator AR4 and resistors R71, R81, and R73. When the input current is too large (such as short circuit), the VDDA voltage increases, and the AR4-4 voltage increases. When it is higher than the voltage at the AR4-5 terminal, the AR4-2 output is low, which inhibits the operation of the subsequent circuit and cuts off the output to achieve overcurrent protection.

[0039] Power supply module DC / DC: converts 28VDC to 5VDC to provide working power for the LOGIC CONTROL module.

[0040] Hall element SENSOR: The sensor is used to sense the current intensity in the maritime satellite fan power supply circuit, and convert the current signal into a voltage signal to provide it to the logic control module for processing.

[0041] Logic control module LOGIC CONTROL: contains a delay circuit and a set of logic control circuits, as shown in the attached Figure 14-15As shown, the delay circuit is mainly composed of NE555DR and CD4017. NE555DR provides a stable clock signal for CD4017. After receiving the clock signal, CD4017 outputs a high level at the same intervals in Q0-Q9. The interval time is determined by the clock cycle, which can be changed by adjusting the potentiometer RP1. When powered on, capacitor C1 is charged through RP1, R11 and R22, and the voltages of pins 2 and 6 of NE555DR gradually increase. When the voltage of C1 is less than 1 / 3VCC, the output of pin 3 is high; when the voltage of C1 is between 1 / 3VC and 2 / 3VCC, the output of pin 3 remains (high); when the voltage of C1 is greater than 2 / 3VCC, the output of pin 3 is low, and the built-in triode of NE555DR is turned on, C1 starts to discharge, and when the voltage of C1 is between 1 / 3VCC and 2 / 3VCC, the output of pin 3 remains (low); when the voltage of C1 is less than 1 / 3VCC, the output of pin 3 is high, and so on and so forth, to achieve a stable clock output. Since NE555DR and CD4017 are powered by U1 (DC / DC), and the input of U1 comes from the AC / DC module, this design can ensure that the maritime satellite fan can avoid logic errors caused by the instantaneous impact current when it is powered on, so that the maritime satellite fan has sufficient time to enter a stable state. When U3-6 outputs a high level, the thyristor Q3 is turned on and maintained, the relay JK1 is energized, and the output signal SENSOR+ of the Hall sensor is connected to the in-phase terminal AR1-7 of the comparator LM2901DR2G. When SENSOR+ is greater than 0.5V (the voltage value corresponding to the loop current of 0.2A), AR1-1 outputs a high level, triggering the thyristor Q5 to work and maintain, JK2 is energized, disconnecting the alarm circuit, and the output component does not alarm; when SENSOR+ is less than 0.5V, AR1-14 outputs a high level, triggering the NPN transistor QA2 to turn on, realizing the low current abnormal alarm; U 3-9 is enabled to output high level after U3-6, triggering thyristor Q2 to turn on and keep it, JK3 is energized, and the sensor signal SENSOER+ is used as the in-phase input of AR1-5 through JK3. When the in-phase voltage is greater than 2.5V (the voltage value corresponding to the loop current 1A), AR1-2 outputs high level, triggering thyristor Q4 to turn on and keep it, JK4 is energized, and the warning signal is triggered; U3-11 is enabled to output high level after U3-9, triggering thyristor Q1 to turn on and keep it, JK5 is energized, and the AC / DC output voltage signal is used as JK6 input through JK5 to provide power for the output component. The judgment of the current state of the maritime satellite fan is realized, and the judgment result is output to the indication component as a level signal.

[0042] like Fig. 9The green part is the product component and wiring, and the blue dotted line represents the original connection. After the alarm system is installed, the green wiring is used instead of the blue wiring. The loop current is collected by the control component and then logically processed and output to the indication component. This design does not fundamentally change the blue connection properties and does not affect the original electrical characteristics of the aircraft.

[0043] Figure 10-13 This is the first circuit diagram of the maritime satellite fan alarm system of the present invention. This circuit is the input part of the AC / DC module. In order to meet the electromagnetic compatibility envelope requirements of the aircraft, it is necessary to perform EMI design on the AC input power supply. This circuit uses a filter network composed of common-mode inductors and differential-mode inductors, which effectively improves the input EMC characteristics. Specifically, the first circuit diagram includes a chip UC2854BDW installed in the center of the circuit board, and its pin 1 is grounded; Pin 2 of chip UC2854BDW is connected to the first node, one end of the first node is connected to resistor R38 and then connected to pin 9, capacitor C23 and capacitor C52 are connected between resistor R38 and pin 9 and then grounded, the other end of the first node is connected to resistor R34, thermistor RT1, diode Q3, resistor R7, resistor R6, resistor R2 in sequence and then connected to power supply VCC, wherein one end of thermistor RT1 is also connected to resistor R33 and then grounded, the other end of thermistor RT1 is also connected to line R10-1, line R10-1 and line R9-1 are connected in series with capacitor C7, resistor R12, voltage regulator VR4, diode Q3, capacitor C6, resistor R11, voltage regulator VR3, diode Q2 in sequence; Pin 3 of the chip UC2854BDW is connected to capacitor C23, resistor R20, resistor R89, resistor R88 and then grounded, pin 4 is connected to the line between resistor R20 and resistor R89, and capacitor C15 is provided between pin 4 and pin 3; The pin 5 of the chip UC2854BDW is connected to the resistor R22 and the resistor R27 in sequence, and then connected to the line between the resistor R34 and the thermistor RT1. One end of the resistor R22 is connected to two diodes D8 arranged in parallel and then grounded. The other end of the resistor R22 is also connected to the capacitor C18 and then grounded. The pin 6 of the chip UC2854BDW is connected in series with resistors R16 and R14 in sequence and then connected to the positive pole of the power supply. There are three lines between the positive pole of the power supply and resistor R14, namely the first line, the second line and the third line. The first line is connected in series with diode D2 and then connected to the first end of the transistor. The second end of the transistor is connected to resistors R5 and R9 and connected to line R9-1. The third end of the transistor is connected to resistors R8 and R10 and then connected to line R10-1. The third end of the transistor is also connected to the first end of the thermistor VR2; the second line is connected in series with components L5, inductor L9, diode D4, resistor R4, diode D3 in sequence and then connected to the third end of the thermistor VR2. The second end of the thermistor VR2 is not connected to the line; the third line has two lines after components D1 SDB155-TP are set in sequence. Component D1 The first line of SDB155-TP connects components L2, inductor L1, and inductor L6, and then connects to one end of component SW1. The other end of component SW1 is connected in series with component F1, and then connects to pin 1 of component J1 and pin 1 of component J2. Pin 6 of components J1 and J2 is connected to mounting hole NC4. The second line of component D1 SDB155-TP connects components L7, inductor L1, and inductor L6, and then connects to pin 4 of components J1 and J2. Pin 7 of chip UC2854BDW is connected to resistor R28 and then to pin 11. Resistor R28 is connected in series with capacitor C219. Resistor R30 and resistor R25 are connected to the line between resistor R28 and pin 11, and then to potential VA. Resistor 35 is also connected to the line between resistor R28 and pin 11, and then to ground. Pin 8 of chip UC2854BDW is connected to resistors R32, R15, and R13, and then connected to the positive pole of the power supply; The pin 10 of the chip UC2854BDW is connected to the resistor 29 and then to the power supply VCC. The line between the resistor 29 and the pin 10 is also connected to the amplifier AR1A and the amplifier AR1B and the component TC1; Pin 12 of chip UC2854BDW is connected to resistor R23 and then grounded; Pin 13 of chip UC2854BDW is connected to capacitor C16 and then grounded; Pin 14 of chip UC2854BDW is connected to capacitor C17 and then grounded; Pin 15 of chip UC2854BDW is connected to capacitor C13 and then grounded; Pin 16 of chip UC2854BDW is connected to resistor R17, diode Q4 and then grounded.

[0044] Figure 14-15This is the second circuit diagram of the maritime satellite fan alarm system of the present invention. This circuit is the power conversion part of the AC / DC module, which is mainly composed of transformer T2 and current transformer T3. When the input voltage is lower than the rated value, the output voltage of current transformer T3 decreases, and the output of U8 (UCC28600DR) is turned off to achieve system low voltage protection. For specific circuit details, please refer to Figure 14-15 As shown, no further detailed description is given here.

[0045] Figure 16-Figure 17 This is the third circuit diagram of the maritime satellite fan alarm system of the present invention. This circuit diagram is the over-temperature protection, output overload (short circuit) protection, overvoltage protection, and DC output EMI filtering part of the AC / DC module. Among them, the over-temperature protection is implemented by TC622VOA. This design deploys 2 levels of over-temperature protection. The 85°C protection is implemented by U10 and sampling resistors R74 and R75. When the ambient temperature exceeds 85°C, U10-2 outputs a low level, MOS tube Q13 is cut off, and thus MOS tube Q12 is cut off, and the output is suppressed; 100°C protection is implemented by U10-2 and sampling resistor R75-2. When the ambient temperature exceeds 100°C, U10-2-2 outputs a low level, and the MOSFET tube Q13 is cut off, and thus MOS tube Q12 is cut off, and the output is suppressed; when the output of Q12 is overloaded (such as: short circuit occurs), VDDA is pulled low, and when the output of AR4-2 is low, MOS tube Q13 is cut off, Q12 is cut off, and the output is suppressed, thereby protecting the internal circuit from damage; when the output is overvoltage due to external reasons, the VDDA voltage rises, and the voltage divider network composed of R71, R81, and R73, in which the voltage at the R73 end rises, and when it reaches the set value, the voltage at the opposite end of AR4-4 is higher than that at the same end of AR4-5, and the output of AR4-2 is low. Based on the above principle, the output of Q12 is suppressed; the DC output EMC is provided by the common mode inductors L4 and L8 and the capacitor C50; for specific circuit details, please refer to Figure 16-Figure 17 As shown, no further detailed description is given here.

[0046] Figure 18-Figure 21This is the fourth circuit diagram of the maritime satellite fan alarm system of the present invention. The main principle of this part of the circuit is as follows: It is designed to achieve the following main technical requirements. First, the alarm system should not be affected by the power-on impact current of the maritime satellite fan, so as not to cause misjudgment due to unstable impact current; second, the abnormal signal monitored by the alarm system should be able to be maintained. As long as the parameter exceeds the standard during the monitoring process, the abnormal state will be locked unless the system is powered off. Third, the alarm system should be able to alarm and lock in various abnormal situations, including: the maritime satellite fan does not work (no loop current), abnormal stagnation (loop current increases). This logic circuit mainly uses NE555 timer, CD4017 counter, LM139 comparator, thyristor, relay and other components to achieve technical goals, among which NE555 provides a suitable clock for CD4017, and uses the output end of CD4017 to trigger the thyristor locking detection channel. The detection channel uses a comparator to process the voltage signal output by the Hall element. When the circuit setting conditions are met, the output component displays green; otherwise, the output component displays yellow (optionally red); for specific circuit details, please refer to Figure 18-Figure 21 As shown, no further detailed description is given here.

[0047] Design requirements: When the SDU fan is working normally, it should be able to provide normal working indications for easy inspection by maintenance personnel. When the SDU fan fails and cannot provide cooling function, the warning system should be able to indicate the fault status, and the maintenance personnel should obtain the fault status in time. When the SDU fan performance exceeds the manual requirements, that is, when the fan begins to get stuck but has not yet completely stuck, the warning system should be able to indicate the fault status, and the maintenance personnel should obtain the fault status in time.

[0048] And it should not increase the workload of maintenance personnel, that is, it should be easy to operate.

[0049] It does not change the aircraft structure, does not fundamentally change the original electrical connection of the aircraft, and is easy to construct.

[0050] Design output: Design an SDU fan monitoring and alarm system to monitor the fan working status and indicate the fan status through logical control.

[0051] This embodiment uses products based on Hall elements to modify civil aircraft. Civil aircraft mainly rely on contact sensors to sense signals such as temperature, voltage, current, pressure, and flow. However, contact sensors need to be embedded in the system at the beginning of system design. The later installation of contact sensors requires the destruction of the original structure, which is difficult to construct and will lead to derivative risks, affecting flight safety. This invention uses a contactless design. Through the magnetoelectric effect, the loop current signal is obtained and converted into a voltage signal. After logical processing, it is converted into a visual state, which is convenient for maintenance personnel to check. This design does not destroy the internal structure and external connection of the original equipment of the aircraft, does not affect the structural strength of the aircraft, and does not generate derivative risks.

[0052] Embodiment 2: This embodiment provides a working method of the maritime satellite fan alarm system as described in Embodiment 1, including: The Hall element of the controller senses the current change in the power supply circuit of the maritime satellite fan to obtain the current signal, and converts the current signal into a voltage signal. The logic control module processes and judges the voltage signal, outputs the detection result of the fan working status, displays the fan working status through the indicator component, and issues an alarm when the fan working status exceeds the set threshold.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A maritime satellite fan alarm system, characterized in that: include: A controller and an indicating component, wherein the controller is connected to the indicating component, and the controller includes a Hall element, a logic control module and a power supply module; The Hall element is used to sense the current change in the power supply circuit of the maritime satellite fan to obtain the current signal, and convert the current signal into a voltage signal. The logic control module processes and judges the voltage signal, outputs the detection result of the fan working status, displays the fan working status through the indicator component, and issues an alarm when the fan working status exceeds the set threshold.

2. A maritime satellite fan alarm system according to claim 1, characterized in that: The controller is installed on the existing equipment rack of E6. The controller is used to process different status signals of the fan and convert them into different indication states through signal processing and output them to the output component.

3. A maritime satellite fan alarm system according to claim 1, characterized in that: The power supply module of the controller adopts AC / DC: it uses an AC / DC design with excellent electromagnetic compatibility characteristics and uses the same AC power supply as the SDU fan.

4. A maritime satellite fan alarm system according to claim 1, characterized in that: The Hall element of the controller converts the SDU fan loop current into a voltage signal and provides it to the logic control module for judgment.

5. A maritime satellite fan alarm system according to claim 1, characterized in that: The logic control module of the controller is used to receive the voltage signal provided by the Hall sensor and make a judgment through the logic judgment circuit. The judgment logic is as follows: The judgment is made 30-60 seconds after the system starts to avoid misjudgment caused by unstable inrush current when the SDU fan starts. When the SDU fan fails to start, a warning signal is output to the output component; When the SDU fan starts normally, but the workload increases beyond the manual requirements, a warning signal is output to the output component; When the SDU fan operates normally and the operating parameters meet the requirements of the manual, the system outputs a normal signal to the output component.

6. A maritime satellite fan alarm system according to claim 1, characterized in that: The indicating assembly is installed on the square hole of the left wall plate of the cargo hold entrance. The square hole needs to be opened in advance on the left wall plate, and the left wall plate is made of composite materials; The indicator component provides two indication modes. The green light is on when the system is working normally. The yellow light is on when the SDU fan fails or the parameters are out of tolerance. The indicator component uses a curved lens to diffusely reflect the light.

7. A maritime satellite fan alarm system according to claim 1, characterized in that: The indicating assembly is installed on the left side wall panel of the cargo hold entrance; the indicating assembly consists of a flame-retardant shell and two circuit boards, which are used to receive the output signal provided by the control assembly. The input board and the output board can provide two sets of indication functions that back up each other.

8. A maritime satellite fan alarm system according to claim 1, characterized in that: The controller also includes a filtering module, a power correction module, a low voltage protection module, a pulse conversion module and an overcurrent protection module; The filter module uses common-mode inductors L1, L2 and L6, L7, and capacitors C2 and C3 to suppress common-mode interference for the power input. The series-mode inductors L5, L9 and capacitors C8, C9, C10 form an EMI network to suppress series-mode interference for the high-voltage output DC. The power correction module uses the chip UC2854BDW to achieve power factor correction; The low voltage protection module is composed of a low voltage detection network consisting of T3, U8, and Q7. When the power factor correction output is abnormal, the T2 input is inhibited to achieve the low voltage protection function; The pulse conversion module includes a pulse transformer T2, which is used to convert the high-voltage pulse after power factor correction into a stable 28VDC; The overcurrent protection module is composed of a control network consisting of comparator AR4 and resistors R71, R81, and R73. When the input current exceeds the set threshold, the VDDA voltage increases, and the AR4-4 voltage increases. When it is higher than the voltage at the AR4-5 terminal, the AR4-2 output is low, which inhibits the operation of the subsequent circuit and cuts off the output to achieve overcurrent protection.

9. A working method of a maritime satellite fan alarm system according to any one of claims 1 to 8, characterized in that: include: The Hall element of the controller senses the current change in the power supply circuit of the maritime satellite fan to obtain the current signal, and converts the current signal into a voltage signal. The logic control module processes and judges the voltage signal, outputs the detection result of the fan working status, displays the fan working status through the indicator component, and issues an alarm when the fan working status exceeds the set threshold.

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