Maritime satellite fan alarm system and method

Abstract

A maritime satellite fan alarm system and method, relating to the technical field of fan alarms. The maritime satellite fan alarm system comprises: a controller and an indication assembly, the controller being connected to the indication assembly, and the controller comprising a Hall element, a logic control module and a power supply module. The Hall element is used for sensing a current change in a power supply circuit of a maritime satellite fan, to acquire a current signal, and converting the current signal into a voltage signal; the voltage signal is processed and determined by means of the logic control module, which outputs a detection result of the working state of the fan; the working state of the fan is displayed by means of the indication assembly, and when the working state of the fan exceeds a set threshold, an alarm is emitted. Thus, the system can operate independently and provide an inspection basis for inspection personnel, and has the advantage of being installed without damaging the internal structure and external connection of an original device.

Description

A marine satellite fan alarm system and method Technical Field

[0001] This invention belongs to the field of fan alarm technology, specifically relating to a marine satellite fan alarm system and method. Background Technology

[0002] The maritime satellite system installed on Boeing 737 aircraft has a design flaw: when the maritime satellite fan malfunctions, the aircraft lacks a corresponding alarm function, leading to prolonged overheating and damage to the maritime satellite, affecting normal aircraft operation. This invention designs a signal acquisition, processing, and indication system that monitors the operational status of the maritime satellite fan without damaging the aircraft structure, thus preventing overheating failures of the aircraft's maritime satellite system.

[0003] The cooling of aircraft equipment, including electronic devices, CRTs, instrument panels, etc., is achieved by the electronic equipment ventilation computer. This computer receives system status information from pressure, flow, and temperature sensors and valves, as well as data from related computers such as the cabin pressurization controller, and controls valves and blowers accordingly. The signals generated by the pressure, flow, and temperature sensors and valves are processed by computer logic; when a signal deviates from normal logic, the computer outputs a fault signal. This system is limited to the original aircraft configuration and its implementation is complex, involving multiple sensors. Furthermore, it cannot provide overheat warnings for electronic equipment outside the monitoring range. Technical issues

[0004] Existing technologies mainly acquire various data within the air duct by collecting pressure, flow rate, temperature, and valve position signals. For optional equipment, if the installation location is not in the air duct area, a separate cooling fan needs to be installed. For such equipment, without a miniaturized alarm system, once the heat dissipation fails, the equipment will face the risk of overheating and damage, which will affect the flight safety of the aircraft. Technical solutions

[0005] To address the problems of the prior art, the technical solution adopted in this application is as follows:

[0006] In a first aspect, the present invention provides a marine satellite fan alarm system, comprising: a controller and an indicator component, wherein the controller is connected to the indicator 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 marine satellite fan 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, the indicator component displays the fan working status, and an alarm is triggered when the fan working status exceeds a set threshold.

[0007] Furthermore, the controller is installed on the existing E6 equipment rack without the need for additional drilling. The controller is used to process different fan status signals and convert them into different indication status outputs to the output components through signal processing.

[0008] Furthermore, the power supply module of the controller adopts AC / DC: it uses an AC / DC design with excellent electromagnetic compatibility characteristics to provide the controller with a reliable DC power supply, and uses the same AC power supply as the SDU fan to ensure the reliability of logic parameters.

[0009] Furthermore, the Hall element of the controller: The Hall element can be used to accurately convert the SDU fan loop current into a voltage signal and provide it to the logic control module for judgment.

[0010] 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:

[0011] The judgment is made 30-60 seconds after the system starts up to avoid judgment errors caused by the unstable inrush current when the SDU fan starts.

[0012] When the SDU fan fails to start, such as when it freezes, the system can output a warning signal to the output component.

[0013] When the SDU fan starts normally, but the workload increases beyond the manual requirements due to wear or contamination, the system can output a warning signal to the output component.

[0014] When the SDU fan is working properly and the operating parameters meet the requirements of the manual, the system outputs a normal signal to the output component.

[0015] Furthermore, the indicator component is installed on the square hole in the left side panel of the cargo hold entrance. Only one 23.5mm*28.5mm square hole needs to be pre-drilled in the left side panel. The left side panel is made of composite material, and the hole in the composite material is easy to restore.

[0016] The indicator component provides two indication modes: a solid green light when the aircraft is operating normally; and a solid yellow light when the SDU fan malfunctions or its parameters are out of tolerance. The yellow light will remain on as long as the SDU fan has malfunctioned or its parameters have been out of tolerance since the aircraft was powered on. The indicator component uses a curved lens to diffuse the light.

[0017] Furthermore, the indicator component is mounted on the left side panel of the cargo hold entrance; the indicator component consists of a flame-retardant housing and two circuit boards, used to receive output signals provided by the control component, and the input board and output board can provide two sets of mutually redundant indicator functions.

[0018] 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;

[0019] The filtering module uses common-mode inductors L1, L2, L6, and L7, and capacitors C2 and C3 to suppress common-mode interference at the power input. The series-mode inductors L5 and L9 and capacitors C8, C9, and C10 form an EMI network to suppress series-mode interference at the high-voltage DC output.

[0020] The power correction module uses the UC2854BDW chip to achieve power factor correction;

[0021] The low-voltage protection module consists of a low-voltage detection network composed of T3, U8, and Q7. When the power factor correction output is abnormal, it suppresses the T2 input to achieve the low-voltage protection function.

[0022] The pulse conversion module includes a pulse transformer T2, which converts the power factor corrected high-voltage pulse into a stable 28VDC.

[0023] The overcurrent protection module consists of a control network composed of comparator AR4 and resistors R71, R81, and R73. When the input current exceeds the set threshold, the VDDA voltage rises and the AR4-4 voltage rises. When the voltage is higher than that at the AR4-5 terminal, the AR4-2 output goes low, suppressing the operation of the subsequent circuit and cutting off the output to achieve overcurrent protection.

[0024] In a second aspect, the present invention provides a method for operating the marine satellite fan alarm system as described in the first aspect, comprising:

[0025] The controller uses a Hall element to sense changes in the current in the power supply circuit of the marine satellite fan and obtains a current signal. The current signal is then converted into a voltage signal, which is processed and judged by the logic control module. The detection result of the fan's operating status is output and displayed through an indicator component. An alarm is triggered when the fan's operating status exceeds a set threshold. Beneficial effects

[0026] This invention employs an independently operating marine satellite fan alarm system. It uses the same power source as the monitored system, collects loop current signals, converts these signals into voltage signals, processes and judges them by a logic control module, outputs the detection results, and displays them on an indicator component, providing maintenance personnel with a basis for inspection. This invention features installation without damaging the original equipment's internal structure or external connections, a crucial characteristic in civil aircraft retrofitting and of great significance for ensuring flight safety. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 is a schematic diagram of the controller of the present invention;

[0029] Figure 2 is an external schematic diagram of the controller of the present invention;

[0030] Figure 3 is an external schematic diagram of the indicator component of the present invention;

[0031] Figure 4 is a schematic diagram of the structure of the indicator component of the present invention;

[0032] Figure 5 is a schematic diagram of the installation and observation of the indicator component of the present invention;

[0033] Figure 6 is a schematic diagram of end-user usage observation of the application of the present invention;

[0034] Figure 7 is a schematic diagram of the installation of the marine satellite fan controller of the present invention;

[0035] Figure 8 is an internal circuit block diagram of the marine satellite fan alarm system of the present invention;

[0036] Figure 9 is a system wiring diagram of the marine satellite fan alarm system of the present invention;

[0037] Figure 10 is a diagram of the lower left area of ​​the first circuit of the marine satellite fan alarm system of the present invention;

[0038] Figure 11 is the lower right area diagram of the first circuit diagram of the marine satellite fan alarm system of the present invention;

[0039] Figure 12 is the upper left area diagram of the first circuit diagram of the marine satellite fan alarm system of the present invention;

[0040] Figure 13 is the upper right area diagram of the first circuit diagram of the marine satellite fan alarm system of the present invention;

[0041] Figure 14 is the upper area diagram of the second circuit diagram of the marine satellite fan alarm system of the present invention;

[0042] Figure 15 is the lower part of the second circuit diagram of the marine satellite fan alarm system of the present invention;

[0043] Figure 16 is the upper area diagram of the third circuit diagram of the marine satellite fan alarm system of the present invention;

[0044] Figure 17 is the lower part of the third circuit diagram of the marine satellite fan alarm system of the present invention;

[0045] Figure 18 is the upper left area diagram of the fourth circuit diagram of the marine satellite fan alarm system of the present invention;

[0046] Figure 19 is the upper right area diagram of the fourth circuit diagram of the marine satellite fan alarm system of the present invention;

[0047] Figure 20 is the lower left area diagram of the fourth circuit diagram of the marine satellite fan alarm system of the present invention;

[0048] Figure 21 is the lower right area diagram of the fourth circuit diagram of the marine satellite fan alarm system of the present invention;

[0049] The components include: 1. Power supply module (AC / DC); 2. Logic control module; 3. Hall element; 4. Output board; 5. Input board; 6. Quick release screw; 7. Indicator assembly; 8. Control assembly; 9. SDU fan; 10. SDU fan base (SDU FAN, located at the bottom of the SDU). The best embodiment of the present invention

[0050] A marine satellite fan alarm system includes: a controller and an indicator component. The controller is connected to the indicator 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 power supply circuit of the marine 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 and outputs the detection result of the fan's operating status. The indicator component displays the fan's operating status and issues an alarm when the fan's operating status exceeds a set threshold. Embodiments of the present invention

[0051] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0052] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0053] Example 1, as shown in Figures 1 to 21, provides a marine satellite fan alarm system, including: a controller and an indicator component, the controller being connected to the indicator component, the controller including a Hall element, a logic control module and a power supply module;

[0054] The controller senses the current changes in the power supply circuit of the marine satellite fan through Hall elements to obtain current signals, converts the current signals into voltage signals, and the logic control module processes and judges the voltage signals to output the detection results of the fan's operating status. The fan's operating status is displayed through the indicator component, and an alarm is triggered when the fan's operating status exceeds the set threshold.

[0055] This system employs an independently operating marine satellite fan alarm system, utilizing the same power source as the monitored system. It collects loop current signals, converts them into voltage signals, processes and judges these signals via a logic control module, outputs the detection results, and displays them on an indicator component, providing maintenance personnel with a basis for inspection. This invention features the characteristic of not damaging the original equipment's internal structure or external connections; this characteristic is extremely important in civil aircraft retrofitting and is of great significance for ensuring flight safety.

[0056] The controller is installed on the existing E6 rack without additional drilling. The controller is used to process different fan status signals and convert them into different indicator status outputs to the output components through signal processing.

[0057] The controller's power supply module adopts AC / DC: it uses an AC / DC design with excellent electromagnetic compatibility characteristics to provide the controller with a reliable DC power supply, and uses the same AC power source as the SDU fan to ensure the reliability of logic parameters.

[0058] Hall effect sensor in controller: The Hall effect sensor can be used to accurately convert the SDU fan loop current into a voltage signal and provide it to the logic control module for judgment.

[0059] The controller's logic control module receives the voltage signal from the Hall sensor and performs a judgment through a logic judgment circuit. The judgment logic is as follows:

[0060] The system will make a judgment 30-60 seconds after startup (adjustable) to avoid judgment errors caused by unstable inrush current when the SDU fan starts.

[0061] When the SDU fan fails to start, such as when it freezes, the system can output a warning signal to the output component.

[0062] When the SDU fan starts normally, but the workload increases beyond the manual requirements due to wear, contamination, or other reasons, the system can output a warning signal to the output component.

[0063] When the SDU fan is working properly and the operating parameters meet the requirements of the manual, the system outputs a normal signal to the output component.

[0064] When the control component completely fails, the output component will not work, but this will not affect the normal operation of the SDU fan; see the logic control table for details:

[0065]

[0066]

[0067] The indicator assembly is installed in a square hole on the left side panel of the cargo hold entrance. The left side panel can have one 23.5mm x 28.5mm square hole. The left side panel is made of composite material, which is lightweight and high-strength, and the hole can be easily drilled using specific equipment. The drilled 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 an alarm.

[0068] The indicator assembly offers two indication modes: a solid green light during normal operation, and a solid yellow light when the SDU fan malfunctions or its parameters are out of tolerance. The yellow light will remain continuously lit as long as the SDU fan has experienced a malfunction or out-of-tolerance parameter issue since the aircraft was powered on (a solid red light is also optional). The indicator assembly uses a curved lens to diffuse the light, making it visible but not glaring.

[0069] The indicator component is installed on the left side panel of the cargo hold entrance, allowing maintenance personnel to observe directly from the cargo hold door without entering the cargo hold. This does not increase the workload of maintenance personnel. Airlines can modify the pre-flight inspection work card according to their own situation to conduct a visual inspection of this area, which can be completed in just a few seconds.

[0070] Indicator Components: Composed of a flame-retardant housing and two circuit boards, these components receive output signals from the control components. The input and output boards provide two sets of mutually redundant indicating functions, with a theoretical service life exceeding 100,000 hours. See the indicator component operating status table for details.

[0071]

[0072]

[0073] 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. Detailed descriptions of the module functions are as follows:

[0074] EMI Filter Module: To meet aviation EMC requirements, this product incorporates EMI filtering. Common-mode inductors L1 and L6 are used to suppress common-mode interference at the power input. When common-mode interference current flows through L6 and L1, the unidirectional nature of the current generates a magnetic field within the coils, increasing the coil's inductive reactance and making it exhibit high impedance. This attenuates the common-mode interference current, thus suppressing common-mode interference. Differential-mode inductors L2 and L7 are used to suppress differential-mode interference at the power input. L2, L7, and capacitor C3 form a series circuit. Due to the high inductive reactance of L2 and L7 to differential-mode high-frequency interference, and the low capacitive reactance of capacitor C3, differential-mode interference noise is filtered out, achieving the goal of suppressing differential-mode high-frequency interference noise. Similarly, differential-mode inductors L5 and L9, along with capacitors C8, C9, and C10, form an EMI network to suppress differential-mode interference at the high-voltage DC output.

[0075] Power Factor Correction Module: This product uses the UC2854BDW chip to achieve power factor correction, reducing reactive current and improving circuit efficiency. This chip includes a voltage amplifier, an analog multiplier / divider, a current amplifier, and a fixed-frequency PWM. It also includes a power MOSFET-compatible gate driver, a 7.5V reference, a line predictor, a load enable comparator, a low-power detector, and an overcurrent comparator. The chip's high reference voltage (U2-8) and high oscillator amplitude (U2-16) significantly reduce noise sensitivity and have a low startup current, reducing the burden on the power supply circuitry.

[0076] UVLO DETECT, a low-voltage protection module, consists of a low-voltage detection network composed of T3, U8, and Q7. It can suppress the T2 input when the power factor correction output is abnormal (low), thus realizing the low-voltage protection function.

[0077] HIGH DC / DC Pulse Conversion Module: Pulse Transformer T2 is used to convert the high-voltage pulse (220VDC) after power factor correction into a stable 28VDC.

[0078] The overcurrent protection module CURRENT LIMIT consists of a control network composed of comparator AR4 and resistors R71, R81, and R73. When the input current is too large (such as a short circuit), the VDDA voltage rises and the AR4-4 voltage rises. When the voltage is higher than that at the AR4-5 terminal, the AR4-2 output goes low, suppressing the operation of the subsequent circuit and cutting off the output to achieve overcurrent protection.

[0079] Power supply module DC / DC: Converts 28VDC to 5VDC to provide operating power for the LOGIC CONTROL module.

[0080] Hall element SENSOR: The sensor is used to sense the current intensity in the power supply circuit of the marine satellite fan and convert the current signal into a voltage signal for processing by the logic control module.

[0081] The logic control module (LOGIC CONTROL) includes a delay circuit and a set of logic control circuits, as shown in Figures 14-15. The delay circuit mainly consists of an NE555DR and a CD4017. The NE555DR provides a stable clock signal to the CD4017. After receiving the clock signal, the CD4017 outputs a high level at equal intervals in its Q0-Q9 stages. The interval is determined by the clock period, which can be varied by adjusting potentiometer RP1. Upon power-up, capacitor C1 is charged via RP1, R11, and R22, gradually increasing the voltage at pins 2 and 6 of the NE555DR. When the voltage across C1 is less than 1 / 3 VCC, pin 3 outputs high; when the voltage across C1 is between 1 / 3 VCC and 2 / 3 VCC, the output at pin 3 remains high; when the voltage across C1 is greater than 2 / 3 VCC, the output at pin 3 goes low, and simultaneously, the NE555DR's built-in transistor turns on, causing C1 to discharge. When the voltage across C1 is between 1 / 3 VCC and 2 / 3 VCC, the output at pin 3 remains low; when the voltage across C1 is less than 1 / 3 VCC, the output at pin 3 goes high. This cycle repeats, achieving a stable clock output. Since the NE555DR and CD4017 are powered by U1 (DC / DC), and the input of U1 comes from the AC / DC module, this design ensures that the marine satellite fan has sufficient time to reach a stable state, preventing logic errors caused by the inrush current during power-up. When U3-6 outputs a high level, the thyristor Q3 conducts and remains on, relay JK1 is energized, and the Hall sensor's output signal SENSOR+ is connected to the non-inverting input AR1-7 of comparator LM2901DR2G. When SENSOR+ is greater than 0.5V (the voltage value corresponding to a loop current of 0.2A), AR1-1 outputs a high level, triggering thyristor Q5 to operate and remain on, JK2 is energized, the alarm circuit is disconnected, and the output component does not alarm; when SENSOR+ is less than 0.5V, AR1-14 outputs a high level, triggering NPN transistor QA2 to conduct, realizing a low current abnormality alarm; U U3-9, after being enabled by U3-6, outputs a high level, triggering SCR Q2 to conduct and remain on, and JK3 to engage. The sensor signal SENSOER+ passes through JK3 as the non-inverting input of AR1-5. When the voltage at the non-inverting input is greater than 2.5V (the voltage value corresponding to a loop current of 1A), AR1-2 outputs a high level, triggering SCR Q4 to conduct and remain on, and JK4 to engage, triggering a warning signal. U3-11, after being enabled by U3-9, outputs a high level, triggering SCR Q1 to conduct and remain on, and JK5 to engage. The AC / DC output voltage signal passes through JK5 as the input of JK6, providing power to the output components. This achieves the determination of the maritime satellite fan current status and outputs the determination result as a level signal to the indicator component.

[0082] As shown in Figure 9, the green part represents the product components and wiring, and the blue dotted line represents the original connection. After the alarm system is installed, the green wiring is used to replace the blue wiring. The loop current is collected by the control component, processed by logic, and output to the indicator component. This design does not fundamentally change the blue connection attribute and does not affect the original electrical characteristics of the aircraft.

[0083] Figures 10-13 are the first circuit diagrams of the maritime satellite fan alarm system of the present invention. This circuit is the input section of the AC / DC module. In order to meet the electromagnetic compatibility envelope requirements of aircraft, EMI design is required for 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 mounted in the center of the circuit board, with pin 1 grounded.

[0084] Pin 2 of the UC2854BDW chip is connected to the first node. One end of the first node is connected to resistor R38 and then to pin 9. Between resistor R38 and pin 9, capacitors C23 and C52 are connected and then grounded. The other end of the first node is connected in sequence to resistor R34, thermistor RT1, diode Q3, resistor R7, resistor R6, and resistor R2 and then to power supply VCC. 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, Zener diode VR4, diode Q3, capacitor C6, resistor R11, Zener diode VR3, and diode Q2.

[0085] The UC2854BDW chip has a capacitor C23, a resistor R20, a resistor R89, and a resistor R88 connected to pin 3 and then grounded. Pin 4 is connected to the line between resistor R20 and resistor R89. A capacitor C15 is placed between pin 4 and pin 3.

[0086] Pin 5 of the UC2854BDW chip is connected to resistors R22 and R27 in sequence, and then connected to the line between resistor R34 and thermistor RT1. One end of resistor R22 is connected to two diodes D8 in parallel and then grounded. The other end of resistor R22 is also connected to capacitor C18 and then grounded.

[0087] Pin 6 of the UC2854BDW chip is connected to the positive power supply via series resistors R16 and R14. There are three lines between the positive power supply and resistor R14: the first line, the second line, and the third line. The first line is connected to the first terminal of a transistor via series diode D2. The second terminal of the transistor is connected to resistors R5 and R9 via line R9-1. The third terminal of the transistor is connected to resistors R8 and R10 via line R10-1. The third terminal of the transistor is also connected to the first terminal of the thermistor VR2. The second line is connected to the third terminal of the thermistor VR2 via series components L5, inductor L9, diode D4, resistor R4, and diode D3. The second terminal of the thermistor VR2 is not connected to any line. The third line has two lines after connecting component D1 (SDB155-TP). The first line of the SDB155-TP connects to components L2, L1, and L6, and then to one end of component SW1. The other end of component SW1 is connected in series with component F1 and then to pin 1 of component J1 and pin 1 of component J2. Pins 6 of components J1 and J2 are connected to mounting hole NC4. The second line of the SDB155-TP connects to components L7, L1, and L6, and then to pin 4 of components J1 and J2.

[0088] The UC2854BDW chip has a resistor R28 connected to pin 7 and then connected 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 connected to potential VA. Resistor R35 is also connected to the line between resistor R28 and pin 11 and then grounded.

[0089] The UC2854BDW chip is connected to the positive terminal of the power supply after connecting resistors R32, R15, and R13 to pin 8.

[0090] The UC2854BDW chip has pin 10 connected to resistor 29 and then connected to power supply VCC. The line between resistor 29 and pin 10 is also connected to amplifier AR1A and amplifier AR1B, as well as component TC1.

[0091] Pin 12 of the UC2854BDW chip is connected to ground via resistor R23;

[0092] Pin 13 of the UC2854BDW chip is connected to capacitor C16 and then grounded.

[0093] Pin 14 of the UC2854BDW chip is connected to capacitor C17 and then grounded;

[0094] Pin 15 of the UC2854BDW chip is connected to capacitor C13 and then grounded.

[0095] Connect resistor R17 and diode Q4 to pin 16 of the UC2854BDW chip and then ground.

[0096] Figures 14-15 show the second circuit diagram of the marine satellite fan alarm system of the present invention. This circuit is the power conversion part of the AC / DC module, 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, shutting down the output of U8 (UCC28600DR) to realize the low voltage protection of the system. For specific circuit details, please refer to Figures 14-15, which will not be described in detail here.

[0097] Figures 16-17 show the third circuit diagram of the maritime satellite fan alarm system of the present invention. This circuit diagram includes the over-temperature protection, output overload (short circuit) protection, overvoltage protection, and DC output EMI filtering sections of the AC / DC module. Over-temperature protection is implemented by the TC622VOA. This design deploys two levels of over-temperature protection. 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, MOSFET Q13 is cut off, and thus MOSFET Q12 is cut off, suppressing the output. 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 MOSFET Q13 is cut off. Therefore, MOSFET Q12 is turned off, and the output is suppressed. When Q12 output is overloaded (e.g., a short circuit occurs), VDDA is pulled low. When AR4-2 output is low, MOSFET Q13 is turned off, Q12 is turned off, and the output is suppressed, thus protecting the internal circuit from damage. When the output is overvoltage due to external reasons, VDDA voltage rises. In the voltage divider network composed of R71, R81, and R73, the voltage at the R73 terminal rises. When it reaches the set value, the voltage at the opposite terminal of AR4-4 is higher than that at the same terminal of AR4-5, and AR4-2 output is low. In the same way as above, Q12 output is suppressed. DC output EMC is provided by common mode inductors L4 and L8 and capacitor C50. For specific circuit details, please refer to Figures 16 and 17, which will not be described in detail here.

[0098] Figures 18-21 are the fourth circuit diagram of the marine satellite fan alarm system of the present invention. The main principle of this circuit is as follows: Designed to achieve the following main technical requirements: First, the alarm system should be unaffected by the inrush current of the marine satellite fan during power-on, and should not be misjudged due to unstable inrush current; Second, the abnormal signals monitored by the alarm system should be maintained, and the abnormal state should be locked as long as any parameter exceeds the standard during the monitoring process, unless the system is powered off; Third, the alarm system should be able to alarm and lock under various abnormal conditions, including: the marine satellite fan not working (no loop current) and abnormal jamming (increased loop current). This logic circuit mainly uses components such as the NE555 timer, CD4017 counter, LM139 comparator, thyristor, and relay to achieve its technical objectives. The NE555 provides a suitable clock for the CD4017, and the output of the CD4017 triggers the thyristor to lock the detection channel. The detection channel processes the voltage signal output by the Hall element using a comparator. When the circuit's set conditions are met, the output component displays green; otherwise, the output component displays yellow (or red if desired). Specific circuit details can be found in Figures 18-21, and will not be described in detail here.

[0099] Design Requirements: When the SDU fan is operating normally, the system should provide a normal operating status indicator to facilitate maintenance personnel's inspection. When the SDU fan malfunctions and fails to provide cooling, the warning system should provide a fault status indication, allowing maintenance personnel to promptly obtain the fault information. When the SDU fan performance exceeds the manual requirements, i.e., when the fan begins to jam but is not yet completely stuck, the warning system should provide a fault status indication, allowing maintenance personnel to promptly obtain the fault information.

[0100] Furthermore, it does not increase the workload of maintenance personnel, meaning it is easy to operate.

[0101] It does not change the aircraft structure or the original electrical connections, and is easy to construct.

[0102] Design output: Design an SDU fan monitoring and alarm system to monitor the fan's operating status and indicate the fan status through logic control.

[0103] This embodiment describes the retrofitting of a civil aircraft using Hall effect sensors. Civil aircraft primarily rely on contact sensors to sense signals such as temperature, voltage, current, pressure, and flow rate. However, contact sensors need to be embedded in the system during the initial design phase. Adding contact sensors later requires damaging the existing structure, leading to significant construction difficulties and potential risks that could affect flight safety. This invention utilizes a contactless design, acquiring loop current signals through the magnetoelectric effect and converting them into voltage signals. After logical processing, these signals are made visible, facilitating inspection by maintenance personnel. This design does not damage the aircraft's existing internal structure or external connections, does not affect the aircraft's structural strength, and avoids any derivative risks.

[0104] Example 2: This example provides a method for operating a marine satellite fan alarm system as described in Example 1, including:

[0105] The controller uses a Hall element to sense changes in the current in the power supply circuit of the marine satellite fan and obtains a current signal. The current signal is then converted into a voltage signal, which is processed and judged by the logic control module. The detection result of the fan's operating status is output and displayed through an indicator component. An alarm is triggered when the fan's operating status exceeds a set threshold.

[0106] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention. Industrial applicability

[0107] By acquiring the circuit current signal, converting the current signal into a voltage signal, and processing and judging it by the logic control module, the detection result is output and displayed by the indicator component, providing a basis for inspection for maintenance personnel.

Claims

1. A marine satellite fan alarm system, characterized in that, include: A controller and an indicator component, wherein the controller is connected to the indicator component, and the controller includes a Hall element, a logic control module, and a power supply module; Hall effect sensors are used to detect current changes in the power supply circuit of the marine satellite fan 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's operating status, displays the fan's operating status through an indicator component, and issues an alarm when the fan's operating status exceeds a set threshold.

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

3. A marine 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 source as the SDU fan.

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

5. A marine 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 up to avoid judgment errors caused by the unstable inrush current when the SDU fan starts. When the SDU fan fails to start, an alarm signal is output to the output component; When the SDU fan starts normally, but the workload increases beyond the manual's requirements, an alarm signal is output to the output component; When the SDU fan is working properly and the operating parameters meet the requirements of the manual, the system outputs a normal signal to the output component.

6. A marine satellite fan alarm system according to claim 1, characterized in that, The indicator component is installed on the square hole in the left side panel of the cargo hold entrance. The square hole in the left side panel needs to be pre-drilled, and the left side panel is made of composite material. The indicator component provides two indication modes: a solid green light when working normally, and a solid yellow light when the SDU fan malfunctions or parameters are out of tolerance; the indicator component uses a curved lens to diffuse the light.

7. A marine satellite fan alarm system according to claim 1, characterized in that, The indicator component is mounted on the left side panel of the cargo hold entrance; the indicator component consists of a flame-retardant housing and two circuit boards, which are used to receive output signals provided by the control component. The input board and the output board can provide two sets of indicator functions that are backups for each other.

8. A marine 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 filtering module uses common-mode inductors L1, L2, L6, and L7, and capacitors C2 and C3 to suppress common-mode interference at the power input. The series-mode inductors L5 and L9 and capacitors C8, C9, and C10 form an EMI network to suppress series-mode interference at the high-voltage DC output. The power correction module uses the UC2854BDW chip to achieve power factor correction; The low-voltage protection module consists of a low-voltage detection network composed of T3, U8, and Q7. When the power factor correction output is abnormal, it suppresses the T2 input to achieve the low-voltage protection function. The pulse conversion module includes a pulse transformer T2, which converts the power factor corrected high-voltage pulse into a stable 28VDC. The overcurrent protection module consists of a control network composed of comparator AR4 and resistors R71, R81, and R73. When the input current exceeds the set threshold, the VDDA voltage rises and the AR4-4 voltage rises. When the voltage is higher than that at the AR4-5 terminal, the AR4-2 output goes low, suppressing the operation of the subsequent circuit and cutting off the output to achieve overcurrent protection.

9. A method of operating the marine satellite fan alarm system as described in any one of claims 1-8, characterized in that, include: The controller uses a Hall element to sense changes in the current in the power supply circuit of the marine satellite fan and obtains a current signal. The current signal is then converted into a voltage signal, which is processed and judged by the logic control module. The detection result of the fan's operating status is output and displayed through an indicator component. An alarm is triggered when the fan's operating status exceeds a set threshold.

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