Power interruption monitoring system for air bag deicing system

Abstract

The utility model belongs to the technical field of aircraft airbag deicing systems, and particularly relates to a power interruption monitoring system for an airbag deicing system. The system comprises a voltage division unit, a comparison unit, a control unit and a storage unit. The voltage dividing unit is used for sampling and dividing the monitored voltage and then transmitting the voltage to the first input of the comparison unit; the second input of the comparison unit is connected with reference voltage; when the voltage division value of the monitored voltage is lower than the second input of the comparison unit, the comparison unit outputs a first level, and when the voltage division value of the monitored voltage is higher than the second input of the comparison unit, the comparison unit outputs a second level; and when the control unit monitors that the output of the comparison unit is converted from the second level to the first level, the monitored voltage is judged to be interrupted, and fault information is stored in the storage unit.

Description

Technical Field

[0001] This utility model belongs to the technical field of aircraft airbag de-icing systems, and specifically relates to a power interruption monitoring system for airbag de-icing systems. Background Technology

[0002] Civil aircraft face various severe weather conditions on their routes. The airbag de-icing system ensures that the aircraft will not cause safety accidents due to icing when passing through icing cloud areas. When the onboard power system experiences a power outage, the de-icing system controller needs to record fault information and de-icing system status information in a timely manner to ensure that the de-icing system can maintain the working state before the power outage after the power is restored.

[0003] The onboard power system provides 28V DC power to the airbag de-icing system. The minimum voltage required to maintain the airbag de-icing system is 18V. If the power supply voltage is too low, the de-icing operation will be interrupted suddenly. When the power supply is restored, the system will not be able to continue operating in the previous state, causing catastrophic consequences.

[0004] Therefore, it is essential to effectively identify power voltage anomalies and record the operating status of the de-icing system when the power supply is interrupted. However, current optocoupler-based detection circuits can only detect anomalies caused by a complete power outage and cannot identify anomalies where the power supply voltage is below 18V. Therefore, when the power supply voltage is below 18V, it cannot be effectively detected and handled. Utility Model Content

[0005] Purpose of the utility model: To solve the problems mentioned in the background art, this utility model provides a power interruption monitoring system for an airbag de-icing system, which monitors the voltage of the power supply in real time and stores fault information and the working status of the de-icing system when the power supply voltage is lower than a set threshold.

[0006] The technical solution of this utility model:

[0007] A power interruption monitoring system for an airbag de-icing system includes a voltage divider unit, a comparison unit, a control unit, and a storage unit;

[0008] The voltage divider unit is used to sample and divide the monitored voltage and transmit it to the first input of the comparison unit; the second input of the comparison unit is connected to the reference voltage.

[0009] When the voltage division value of the monitored voltage is lower than the second input of the comparison unit, the comparison unit outputs a first level; when the voltage division value of the monitored voltage is higher than the second input of the comparison unit, the comparison unit outputs a second level.

[0010] When the control unit detects that the output of the comparison unit changes from the second level to the first level, it determines that the monitored voltage has been interrupted and stores the fault information in the storage unit.

[0011] Furthermore, the voltage divider unit includes a first resistor R1, a second resistor R2, and a third resistor R3 connected in series;

[0012] The input terminal of the first resistor R1 is connected to the voltage being monitored, and the first input of the comparison unit is connected between the second resistor R2 and the third resistor R3.

[0013] Furthermore, the system also includes a filtering unit.

[0014] The filtering unit includes: a transient voltage suppression diode V4, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4;

[0015] The transient voltage suppression diode V4 is placed between the voltage divider unit and the monitored voltage. One end of the transient voltage suppression diode V4 is connected to the monitored voltage, and the other end is grounded.

[0016] The first capacitor C1 is placed between the monitored voltage and ground;

[0017] The second capacitor C2 is positioned between the reference voltage and ground;

[0018] The third capacitor is placed between the negative power supply terminal of the comparator and ground;

[0019] The fourth capacitor is placed between the positive power supply terminal of the comparator and ground.

[0020] Furthermore, it also includes a power failure protection unit;

[0021] The power failure protection unit includes a large capacitor and a voltage conversion chip N4;

[0022] The large capacitor has pin 1 connected to the monitored voltage and pin 3 grounded.

[0023] Pin 1 of the large capacitor is connected to the positive voltage input terminal of the voltage conversion chip N4, and pin 3 is connected to the negative voltage input terminal of the voltage conversion chip N4.

[0024] The 5V output of the voltage conversion chip N4 is connected to the positive power supply terminal of the comparator unit after being filtered by a capacitor and divided by a resistor.

[0025] Furthermore, the control unit triggers an interrupt by capturing the level change of the comparison unit's output and stores the fault information in the interrupt handling function.

[0026] Furthermore, the large capacitor in the power failure protection unit stores a certain amount of charge before the power failure. When the system experiences a power outage, the large capacitor discharges, thereby maintaining the power required by the airbag de-icing system power failure monitoring system.

[0027] Beneficial effects

[0028] If the power supply to the de-icing system is interrupted and measures are not taken in time, the de-icing system will be unable to maintain its previous working state after the power supply is restored, resulting in the failure of the de-icing function and posing a huge threat to flight safety.

[0029] The optocoupler-type power interruption monitoring circuit cannot set a lower limit value for monitoring. It can only detect a power interruption when the power supply is completely disconnected, meaning it cannot detect situations where the supply voltage is below 18V and above 0V.

[0030] This method uses a comparator to monitor the power supply voltage of the de-icing system in real time. When the voltage drops below 18V, fault information and de-icing status are stored promptly. Compared with optocoupler-based power interruption monitoring methods, this method significantly improves detection accuracy. When power is restored, the de-icing system can continue operating in the state it was in before the power interruption, improving the reliability and safety of the airbag de-icing system. Attached Figure Description

[0031] Figure 1 This is a block diagram illustrating the principle of a power interruption monitoring system for an airbag de-icing system.

[0032] Figure 2 This is a circuit diagram of a power interruption monitoring system for an airbag de-icing system. Detailed Implementation

[0033] This utility model discloses a power interruption monitoring system for an airbag de-icing system, comprising: a voltage divider unit, a comparison unit, a power failure protection unit, a filtering unit, a control unit, and a storage unit;

[0034] The principle of the voltage interruption monitoring system for the airbag de-icing system is as follows: Figure 1 As shown, the voltage monitoring circuit outputs a first level when it detects that the power supply voltage is lower than the set threshold (3.3V); otherwise, it outputs a second level. When the power supply voltage is normal, the output of the voltage monitoring circuit is at the second level; when the power supply is interrupted, the output of the voltage monitoring circuit is at the first level. The control unit collects the output level of the voltage monitoring circuit. When the output of the voltage monitoring circuit changes from the second level to the first level, the control unit captures this change and writes the fault information and the status information of the de-icing system into the storage unit.

[0035] The voltage divider unit is as follows: Figure 2As shown, the system consists of resistors R1, R2, and R3. First, a lower limit value of the voltage to be monitored is preset and used as the second input of comparator U1. Then, the monitored voltage is divided by the three resistors R1, R2, and R3, and the resulting voltage division value is used as the first input of comparator U1. The voltage range for maintaining the normal operation of the de-icing system is 18V to 30V. By configuring the three resistors R1 = 4.7K, R2 = 10K, and R3 = 3.3K to divide the supply voltage, the voltage range of the first input of the comparator when the de-icing system is operating normally is 3.3V to 5.5V. The second input of the comparator is configured to be 3.3V. When the first input voltage value of the comparator is lower than the second input voltage value, the output of the comparator changes from the second level to the first level.

[0036] The comparison unit includes a comparator U1, which uses the output of the voltage divider unit and the lower limit value of the monitored voltage as the first and second inputs of the comparator, respectively.

[0037] The power failure protection unit is attached. Figure 2 As shown, it includes a large capacitor C5. When the power supply voltage is lower than 18V, C5 discharges. The HTR28T515-B converts the 28V voltage to 5V voltage. After filtering by C6, C7, and C8 and voltage division by R5 and R6, it powers the comparator unit, enabling the system to operate normally for a short time.

[0038] The filtering unit consists of an attached Figure 2 It consists of a transient voltage suppressor diode V4 and capacitors C1, C2, C3, and C4, each with a capacity of 0.1uF. The transient voltage suppressor diode is responsible for filtering out voltage spikes during power supply, while C1, C2, C3, and C4 are responsible for filtering out high-frequency noise.

[0039] The control unit acquires the output level of the comparison unit. When the output of the comparison unit changes from the second level to the first level, the software inside the control unit records the fault information and de-icing status information at this moment and writes them into the storage unit.

Claims

1. A power interruption monitoring system for an airbag de-icing system, characterized in that, The system includes a voltage divider unit, a comparator unit, a control unit, and a storage unit; The voltage divider unit is used to sample and divide the monitored voltage and transmit it to the first input of the comparison unit; the second input of the comparison unit is connected to the reference voltage. When the voltage division value of the monitored voltage is lower than the second input of the comparison unit, the comparison unit outputs a first level; when the voltage division value of the monitored voltage is higher than the second input of the comparison unit, the comparison unit outputs a second level. When the control unit detects that the output of the comparison unit changes from the second level to the first level, it determines that the monitored voltage has been interrupted and stores the fault information in the storage unit.

2. The power interruption monitoring system for the airbag de-icing system according to claim 1, characterized in that, The voltage divider unit includes a first resistor R1, a second resistor R2, and a third resistor R3 connected in series; The input terminal of the first resistor R1 is connected to the voltage being monitored, and the first input of the comparison unit is connected between the second resistor R2 and the third resistor R3.

3. The power interruption monitoring system for the airbag de-icing system according to claim 2, characterized in that, The system also includes a filtering unit. The filtering unit includes: a transient voltage suppression diode V4, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4; The transient voltage suppression diode V4 is placed between the voltage divider unit and the monitored voltage. One end of the transient voltage suppression diode V4 is connected to the monitored voltage, and the other end is grounded. The first capacitor C1 is placed between the monitored voltage and ground; The second capacitor C2 is positioned between the reference voltage and ground; The third capacitor is placed between the negative power supply terminal of the comparator and ground; The fourth capacitor is placed between the positive power supply terminal of the comparator and ground.

4. The power interruption monitoring system for the airbag de-icing system according to claim 1, characterized in that, It also includes a power failure protection unit; The power failure protection unit includes a large capacitor and a voltage conversion chip N4; The large capacitor has pin 1 connected to the monitored voltage and pin 3 grounded. Pin 1 of the large capacitor is connected to the positive voltage input terminal of the voltage conversion chip N4, and pin 3 is connected to the negative voltage input terminal of the voltage conversion chip N4. The 5V output of the voltage conversion chip N4 is connected to the positive power supply terminal of the comparator unit after being filtered by a capacitor and divided by a resistor.

5. The power interruption monitoring system for the airbag de-icing system according to claim 4, characterized in that, The control unit triggers an interrupt by capturing the level change of the comparison unit's output and stores the fault information in the interrupt handling function.

6. The power interruption monitoring system for the airbag de-icing system according to claim 5, characterized in that, upon power failure... The large capacitor in the protection unit stores a certain amount of charge before power failure. When the system experiences a power outage, the large capacitor discharges, thereby maintaining the power required by the airbag de-icing system power outage monitoring system.

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