A high-power isolation diode fault detection method

Abstract

The application relates to the field of aviation electrical control, in particular to a high-power isolation diode fault detection method, which is applied to a power supply circuit of a helicopter electrical system and comprises a high-power isolation diode open-circuit fault detection method and a high-power isolation diode short-circuit fault detection method; the method solves the problem that when a diode fails, the power supply system of the helicopter electrical system is not easy to monitor after the fault, equipment is damaged and the like, and the safety of the airplane is affected.

Description

Technical Field

[0001] This invention relates to the field of aviation electrical control, and more specifically to a method for detecting faults in high-power isolation diodes. Background Technology

[0002] Currently, helicopters lack effective real-time detection methods for diode faults. Typically, if a diode fault has little impact on flight safety, the faulty component is replaced after the flight. However, if a diode fault could lead to serious consequences, multiple backups or derating are generally employed.

[0003] Currently, the power supply system for helicopter electrical systems, such as Figure 1 As shown, the dual-power isolated supply, typically using diodes for isolation, presents risks such as difficulty in detecting faults and equipment damage, impacting aircraft safety. Degrading or using multiple backups increases cost and weight. With the development of helicopter technology, the requirements for helicopter power systems are becoming increasingly stringent, demanding not only simple structure, high intelligence, light weight, and good ergonomics, but also high reliability, safety, and ease of maintenance. The high-power isolation diode real-time fault monitoring method will inject new vitality into the field of helicopter electrical control. Summary of the Invention

[0004] The purpose of this invention is to propose a high-power isolation diode fault detection method to address the risks associated with diode failure in helicopter electrical systems, such as difficulty in monitoring the fault and equipment damage, which affect aircraft safety.

[0005] The technical solution of this invention:

[0006] A high-power isolation diode fault detection method is applied to the power supply circuit of a helicopter electrical system. The power supply circuit of the helicopter electrical system includes diode No. 1 and diode No. 2. The method includes a high-power isolation diode open-circuit fault detection method and a high-power isolation diode short-circuit fault detection method.

[0007] Furthermore, the high-power isolation diode short-circuit fault detection method includes short-circuit fault detection for diode No. 1 and diode No. 2;

[0008] The specific steps for detecting a short circuit in diode #1 are as follows:

[0009] Step 1-1: Collect the voltage of PP1 busbar, voltage of PP3 busbar, current of diode 1, status of battery pack contactor, and status of contactor 1 and contactor 2 through the power supply processor;

[0010] Step 1-2: According to the data collected in step 1, when the No. 1 diode meets the determination condition, it is considered to be in a short circuit state.

[0011] Further, in step 1-2, when the No. 1 diode meets the determination conditions (a) (b) at the same time, it is considered to be in a short circuit state:

[0012] (a) The No. 1 contactor and the No. 2 contactor are both in an open state;

[0013] (b) The battery contactor is on && the PP1 busbar voltage > 5V && the PP3 busbar voltage > 10V && the No. 1 diode current < -10A.

[0014] Further, when it is judged that the No. 1 diode is in a short circuit state, a No. 1 diode short circuit fault is reported, and the No. 1 unloading contactor is opened.

[0015] Further, the No. 2 diode short circuit fault detection specifically includes the following steps:

[0016] Step 2-1: Collect the PP2 busbar voltage, the PP3 busbar voltage, the No. 2 diode current, the battery contactor state, the No. 1 contactor and the No. 2 contactor state through the power supply processor;

[0017] Step 2-2: According to the data collected in step 2-1, when the No. 2 diode meets the determination condition, it is considered to be in a short circuit state.

[0018] Further, in step 2-2, when the No. 2 diode meets the determination conditions (c) (d) at the same time, it is considered to be in a short circuit state:

[0019] (c) The No. 1 contactor and the No. 2 contactor are both in an open state;

[0020] (d) The battery contactor is on && the PP2 busbar voltage > 5V && the PP3 busbar voltage > 10V && the No. 2 diode current < -10A.

[0021] Further, when it is judged that the No. 2 diode is in a short circuit state, a No. 2 diode short circuit fault is reported, and the No. 2 unloading contactor is opened.

[0022] Further, the high-power isolation diode open circuit fault detection method is for the detection when the No. 1 diode and the No. 2 diode are both open circuit faults, specifically including the following steps:

[0023] Step 3-1: Collect the No. 1 diode current, the No. 2 diode current, the No. 1 contactor state, the No. 2 contactor state, the battery contactor state, and the battery current and capacity data through the power supply processor;

[0024] Step 3-2: Through the data collected by step 3-2, when the 1st and 2nd diodes simultaneously satisfy the determination conditions, it is considered that the 1st and 2nd diodes are both in open circuit state.

[0025] Further, in step 3-2, when the 1st and 2nd diodes simultaneously satisfy the determination conditions (e) (f), it is considered that the 1st and 2nd diodes are both in open circuit state:

[0026] (e) The battery pack contactor is turned on, and at least one of the 1st contactor or the 2nd contactor is in the on state;

[0027] (f) The 1st diode current < 4A && the 2nd diode current < 4A && the battery discharge current > 1A && the battery capacity < 85%.

[0028] Further, when it is determined that the 1st and 2nd diodes are both in open circuit state, the 1st and 2nd open circuit faults are reported at the same time.

[0029] Advantages of the present application:

[0030] The present application provides a high-power isolation diode fault detection method, which can detect the open circuit and short circuit conditions of the 1st and 2nd diodes in the power supply system of the helicopter electrical system in real time online. The application on the aircraft will reduce the system weight, has the advantages of high reliability, safety, easy maintenance, etc., and improves the safety of the aircraft. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The circuit principle diagram of the power supply system of the helicopter electrical system;

[0032] Figure 2 The 1st and 2nd diode open circuit fault detection flowchart of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0034] As Figure 1As shown, it is the power supply system circuit structure principle diagram of typical helicopter electrical system, adopts double power supply isolation power supply, usually uses diode to isolate, that is, uses No. 1 diode and No. 2 diode to isolate, the circuit structure includes PP1 busbar, PP2 busbar, PP3 busbar, PP1 busbar, PP2 busbar are two independent busbars, and the communication or disconnection of PP1 busbar, PP2 busbar is controlled by a 300A phase connection contactor;PP1 busbar, PP2 busbar are connected to PP3 busbar simultaneously, PP1 busbar and PP3 busbar are isolated by No. 1 diode, PP2 busbar and PP3 busbar are isolated by No. 2 diode, PP1 busbar is connected by No. 1 unloading contactor;PP2 busbar is connected by No. 2 unloading contactor;No. 1 unloading contactor, No. 2 unloading contactor are connected to power supply processor by control line respectively, and the power supply processor can control the attraction or disconnection of No. 1 unloading contactor, No. 2 unloading contactor;PP3 busbar is connected with battery pack through a battery contactor with a capacity of 80A, and PP3 busbar supplies power to the battery pack on the machine, at the same time, the battery pack feeds back its voltage signal, current signal and capacity signal to the power supply processor through the signal line, and the power supply processor judges whether other components need to supply power to the battery pack according to the signal fed back by the battery pack.

[0035] When No. 1 and No. 2 diodes are faulty, the prior art is not easy to monitor, the equipment is damaged and other risks, which affects the safety of the aircraft.

[0036] Therefore, based on the above problems, the present application provides a high-power isolation diode fault detection method, which is applied to the power supply circuit of a helicopter electrical system, including a high-power isolation diode open circuit fault detection method and a high-power isolation diode short circuit fault detection method.

[0037] In the present application, the high-power isolation diode short circuit fault detection method includes short circuit fault detection of No. 1 diode and No. 2 diode.

[0038] The No. 1 diode short circuit fault detection specifically includes the following steps:

[0039] Step 1-1: collecting PP1 busbar voltage, PP3 busbar voltage, No. 1 diode current, battery pack contactor state, No. 1 contactor and No. 2 contactor state by power supply processor;

[0040] Step 1-2: when No. 1 diode meets the determination condition, it is considered to be in short circuit state according to the data collected in step 1, and when No. 1 diode meets determination conditions (a) and (b) simultaneously, it is considered to be in short circuit state:

[0041] (a) No. 1 contactor and No. 2 contactor are both in off state;

[0042] (b) battery contactor is on && PP1 bus voltage > 5V && PP3 bus voltage > 10V && No. 1 diode current < -10A.

[0043] Step 1-3: when judging that No. 1 diode is in short circuit state, report No. 1 diode short circuit fault, and turn off No. 1 unloading contactor.

[0044] The detection of No. 2 diode short circuit fault specifically includes the following steps:

[0045] Step 2-1: collect PP2 bus voltage, PP3 bus voltage, No. 2 diode current, battery contactor state, No. 1 contactor and No. 2 contactor state through power supply processor;

[0046] Step 2-2: through the data collected in step 2-1, when No. 2 diode meets the judgment condition, it is considered to be in short circuit state; when No. 2 diode meets the judgment conditions (c) (d) at the same time, it is considered to be in short circuit state:

[0047] (c) No. 1 contactor and No. 2 contactor are both in off state;

[0048] (d) battery contactor is on && PP2 bus voltage > 5V && PP3 bus voltage > 10V && No. 2 diode current < -10A.

[0049] Step 2-3: when judging that No. 2 diode is in short circuit state, report No. 2 diode short circuit fault, and turn off No. 2 unloading contactor.

[0050] As shown in Figure 2 In the present application, the open circuit fault detection method of the high-power isolation diode is for the detection when No. 1 diode and No. 2 diode are in open circuit fault at the same time, specifically including the following steps:

[0051] Step 3-1: collect No. 1 diode current, No. 2 diode current, No. 1 contactor state, No. 2 contactor state, battery contactor state, battery current and capacity data through power supply processor;

[0052] Step 3-2: through the data collected in step 3-2, when No. 1 and No. 2 diodes meet the judgment conditions at the same time, it is considered that No. 1 and No. 2 diodes are both in open circuit state; when No. 1 and No. 2 diodes meet the judgment conditions (e) (f) at the same time, it is considered that No. 1 and No. 2 diodes are both in open circuit state:

[0053] (e) battery contactor is on, and at least one of No. 1 contactor or No. 2 contactor is in on state;

[0054] (f) Diode 1 current < 4A && Diode 2 current < 4A && battery discharge current > 1A && battery capacity < 85%.

[0055] Step 3-3: When judging that the No.1 and No.2 diodes are in open circuit state, simultaneously report No.1 and No.2 diode open circuit fault.

[0056] Therefore, the open circuit and short circuit conditions of the specific No.1 and No.2 diodes in the power supply system of the helicopter electrical system can be detected in real time and on line, the on-board application can reduce the system weight, has the advantages of high reliability, safety, easy maintenance and the like, and improves the safety of the aircraft.

[0057] The above is only a specific embodiment of the present application, and the present application is described in detail, and the part not described in detail is a conventional technology. However, the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-power isolation diode fault detection method, applied to the power supply circuit of a helicopter electrical system, wherein the power supply circuit of the helicopter electrical system includes diode No. 1 and diode No. 2, characterized in that, The method includes a method for detecting open-circuit faults in high-power isolation diodes and a method for detecting short-circuit faults in high-power isolation diodes; the method for detecting short-circuit faults in high-power isolation diodes includes detecting short-circuit faults in diode 1 and diode 2. The specific steps for detecting a short circuit in diode #1 are as follows: Step 1-1: Collect the voltage of PP1 busbar, voltage of PP3 busbar, current of diode 1, status of battery pack contactor, and status of unloading contactor 1 and unloading contactor 2 through the power supply processor; Step 1-2: Based on the data collected in Step 1, if diode 1 meets the judgment condition, it is considered to be in a short circuit state; if diode 1 simultaneously meets judgment conditions (a) and (b), it is considered to be in a short circuit state. (a) Both unloading contactor No. 1 and unloading contactor No. 2 are in the open state; (b) Battery contactor is open && PP1 busbar voltage > 5V && PP3 busbar voltage > 10V && Diode No. 1 current < -10A; The specific steps for detecting a short circuit fault in diode #2 are as follows: Step 2-1: Collect the voltage of PP2 busbar, voltage of PP3 busbar, current of diode No. 2, status of battery pack contactor, status of unloading contactor No. 1 and unloading contactor No. 2 through the power supply processor; Step 2-2: Based on the data collected in Step 2-1, if diode 2 meets the judgment condition, it is considered to be in a short-circuit state; if diode 2 simultaneously meets judgment conditions (c) and (d), it is considered to be in a short-circuit state. (c) Both unloading contactor No. 1 and unloading contactor No. 2 are in the open state; (d) Battery contactor is open && PP2 busbar voltage > 5V && PP3 busbar voltage > 10V && Diode No. 2 current < -10A; The method for detecting open-circuit faults in high-power isolation diodes is for detecting simultaneous open-circuit faults in diodes 1 and 2, and specifically includes the following steps: Step 3-1: Collect the current of diode 1, the current of diode 2, the status of unloading contactor 1, the status of unloading contactor 2, the status of battery pack contactor, and the current and capacity data of battery pack through the power supply processor. Step 3-2: Based on the data collected in Step 3-2, if diodes 1 and 2 simultaneously meet the judgment conditions, then diodes 1 and 2 are considered to be in an open circuit state; if diodes 1 and 2 simultaneously meet judgment conditions (e) and (f), then diodes 1 and 2 are considered to be in an open circuit state. (e) The battery pack contactor is closed, and at least one of the unloading contactors, No. 1 or No. 2, is in the closed state. (f) Diode 1 current < 4A && Diode 2 current < 4A && Battery discharge current > 1A && Battery capacity < 85%.

2. The method for fault detection of a high-power isolation diode according to claim 1, characterized in that, When it is determined that diode 1 is in a short-circuit state, a short-circuit fault of diode 1 is reported, and unloading contactor 1 is disconnected.

3. The method for fault detection of a high-power isolation diode according to claim 2, characterized in that, When it is determined that diode 2 is in a short-circuit state, a short-circuit fault of diode 2 is reported, and unloading contactor 2 is disconnected.

4. The method for fault detection of a high-power isolation diode according to claim 3, characterized in that, When it is determined that both diodes 1 and 2 are in an open circuit state, an open circuit fault for diodes 1 and 2 will be reported simultaneously.

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