CN112666375A

CN112666375A - Method for detecting output ripple voltage of aviation TRU

Info

Publication number: CN112666375A
Application number: CN202011511067.3A
Authority: CN
Inventors: 张桂芳; 王博; 孙建勤
Original assignee: Shaanxi Aero Electric Co Ltd
Current assignee: Shaanxi Aero Electric Co Ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-04-16

Abstract

The application belongs to the field of aviation electric power systems, and particularly relates to an aviation TRU output ripple voltage detection method. The method comprises the steps of S1, extracting a pulsating alternating current ripple signal of the output voltage of the aviation TRU; step S2, carrying out positive half-wave sampling on the pulsating alternating current ripple signal; step S3, peak value sampling is carried out, and the peak value of the TRU ripple voltage is obtained; step S4, amplifying voltage amplitude; step S5, isolating and limiting amplitude; step S6, carrying out differential amplification treatment, filtering common-mode noise, and changing the TRU ripple voltage into safe direct-current voltage within 0-3V; and step S7, sending the signals to the AD sampling port of the DSP for sampling and then detecting the output ripple voltage of the aviation TRU. The application can realize the detection of pulsating alternating current ripples in the TRU output direct current voltage, has strong anti-interference capability and high detection precision, is favorable for an aviation power distribution system to carry out the state monitoring of the TRU, carries out fault quick isolation through system control, prevents the fault range from being enlarged, and is favorable for ensuring the safe operation of other electric equipment.

Description

Method for detecting output ripple voltage of aviation TRU

Technical Field

The application belongs to the field of aviation electric power systems, and particularly relates to an aviation TRU output ripple voltage detection method.

Background

At present, a secondary power supply in an aviation alternating current power supply system widely adopts a voltage Transformation Rectifier (TRU) device, and has the advantages of simple structure, reliable work, strong overload capacity and the like. The 12-pulse TRU has a working principle as shown in figure 1, and comprises a three-winding transformer and two three-phase full-bridge rectifying circuits, wherein the primary side and one secondary side of the three-winding transformer are connected into a star shape, the other secondary side of the three-winding transformer is connected into a triangle shape, and the rectifying circuits are led out through a balance reactor to obtain pulsating direct-current voltage at the output end. In the current aviation power system, the output voltage of the TRU device is not regulated, and fault detection and fault diagnosis of the TRU are realized by detecting the output voltage of the TRU device through a bus bar power controller.

In the practical use process, the two three-phase full-bridge rectification circuits of the TRU play a crucial role in the reliable operation of the TRU, and the fault of any one or more of the rectification diodes affects the output voltage of the TRU, so that the normal operation of other electric equipment is interfered. When the open circuit or short circuit fault of the diode occurs, the output direct current ripple voltage of the TRU is increased, high-order harmonic waves are generated, the airplane power grid is polluted, even the TRU winding is burnt out, the flight safety is not facilitated, and therefore the detection of the TRU ripple voltage is particularly important. At present, the TRU ripple detection is adopted for the first time on a certain civil aircraft, and the detection technology of the TRU ripple detection needs to be broken through.

Disclosure of Invention

The method for detecting the output ripple voltage of the aviation transformer rectifier can identify the fault of the diode of the three-phase full-bridge rectifier circuit inside the TRU, is convenient for the bus bar power controller to monitor the state of the TRU, can carry out quick isolation and fault protection when the rectifier circuit inside the TRU breaks down, and ensures the safe work of the later-stage electric equipment.

The application discloses an aviation TRU output ripple voltage detection method mainly includes:

step S1, extracting a pulsating alternating current ripple signal of the output voltage of the aviation TRU;

step S2, carrying out positive half-wave sampling on the pulsating alternating current ripple signal;

step S3, peak value sampling is carried out, and the peak value of the TRU ripple voltage is obtained;

step S4, amplifying voltage amplitude;

step S5, isolating and limiting amplitude;

step S6, carrying out differential amplification treatment, filtering common-mode noise, and changing the TRU ripple voltage into safe direct-current voltage within 0-3V;

and step S7, sending the signals to the AD sampling port of the DSP for sampling and then detecting the output ripple voltage of the aviation TRU.

Preferably, before the step S1, the method further includes dividing the 12-pulse rectified output dc voltage output by the TRU.

Preferably, in step S1, the ripple ac ripple signal of the output voltage of the aviation TRU is extracted by a dc blocking ac circuit including a capacitor.

Preferably, in step S2, sampling is performed by a positive half-wave sampling circuit composed of a diode, a capacitor and an operational amplifier module.

Preferably, before step S3, the method further includes amplifying the sampled signal by a triode.

Preferably, in step S3, the peak value of the TRU ripple voltage is acquired via a peak sample-and-hold circuit composed of a transistor, a capacitor, and a resistor, wherein a discharge time constant composed of the capacitor and the resistor is set to a frequency with respect to the TRU ripple, and it is considered that no discharge is performed.

Preferably, in step S4, the voltage amplitude is amplified by an in-phase proportional amplifier circuit.

Preferably, in step S5, isolation clipping is performed by an analog signal isolator.

The circuit for detecting the TRU output ripple voltage of the aviation transformer rectifier can realize the detection of the pulsating alternating current ripple in the TRU output direct current voltage, has strong anti-jamming capability and high detection precision, is favorable for an aviation power distribution system to monitor the state of the TRU, finds the fault of a rectifier diode in the TRU as early as possible, quickly isolates the fault through system control, prevents the fault range from being expanded, and is favorable for ensuring the safe operation of other electric equipment.

Drawings

Fig. 1 is a schematic diagram of the operation of a 12-pulse TRU.

Fig. 2 is a block diagram of the method for detecting an aircraft TRU output ripple voltage according to the present application.

Fig. 3 is a first partial circuit diagram of the embodiment of fig. 2 of the present application.

Fig. 4 is a second circuit diagram of the embodiment of fig. 2 of the present application, and the two circuit portions shown in fig. 3 and 4 are connected at the reference symbol con.

For the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; further, the drawings are for illustrative purposes, and terms describing positional relationships are limited to illustrative illustrations only and are not to be construed as limiting the patent.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application.

Further, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are used in the description of the invention in a generic sense, e.g., connected as either a fixed connection or a removable connection or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in this application according to the specific situation.

The invention provides a TRU output ripple voltage detection method, which can convert 12-pulse alternating current ripple components in the TRU output direct current voltage into stable direct current voltage and send the stable direct current voltage to a DSP (digital signal processor) for sampling. The designed TRU ripple voltage detection circuit is shown in figures 3-4, and the detection conditioning circuit principle is shown in figure 2.

The TRU output voltage is 12 pulse wave rectification output direct current voltage, firstly, after voltage division is carried out through a resistor R1068 and a resistor R1071, the voltage is sent into a DC blocking alternating current circuit composed of C450, and a pulse alternating current ripple signal of the TRU output voltage is extracted; then sending the sample into a positive half-wave sampling circuit consisting of a diode D125, a triode Q1B and a U192A operational amplifier module, wherein the diode D125 prevents the negative half cycle of the ripple from flowing into a post-stage circuit, so as to extract the positive half wave of the TRU ripple pulse, and carrying out amplitude amplification through a Q1B triode; and then, the peak value sampling and holding circuit consisting of Q1A, C454 and a resistor R1078 is used, the capacitance of the C454 is 1nF, the R1078 is 10M omega, the discharge time constant is large, and the TRU ripple voltage peak value can be obtained by considering that almost no discharge is carried out relative to the frequency of the TRU ripple pulsation. Then the voltage amplitude is amplified by an in-phase proportional amplifying circuit consisting of U193A, and the anti-interference capability is improved. After the analog signal isolator U194 carries out isolation amplitude limiting, the situation that the voltage of the front stage is too high and the rear stage circuit is damaged is prevented; and finally, after differential amplification processing is carried out on the TRU 191 chip, common mode noise is filtered, the TRU ripple voltage is changed into safe direct current voltage within 0-3V, and then the safe direct current voltage is sent to an AD sampling port of the DSP for sampling.

When a rectifier diode inside the TRU has a fault (open circuit or short circuit), the output voltage ripple of the TRU is increased, and when the output voltage ripple passes through the ripple sampling circuit, a ripple sampling value which is far larger than the normal running state of the TRU is obtained, so that the fault can be rapidly identified by a bus bar power controller in a power supply system, and the TRU is controlled to quit the network by controlling the disconnection of a rear-stage contactor of the TRU.

Having thus described the present application in connection with the preferred embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that the scope of the present application is not limited to those specific embodiments, and that equivalent modifications or substitutions of related technical features may be made by those skilled in the art without departing from the principle of the present application, and those modifications or substitutions will fall within the scope of the present application.

Claims

1. The method for detecting the output ripple voltage of the aviation TRU is characterized by comprising the following steps of:

step S4, amplifying voltage amplitude;

step S5, isolating and limiting amplitude;

2. The airborne TRU output ripple voltage detection method of claim 1, wherein:

before step S1, the method further includes dividing the 12-pulse rectified output dc voltage output by the TRU.

3. The airborne TRU output ripple voltage detection method of claim 1, wherein:

in step S1, a ripple ac ripple signal of the output voltage of the aviation TRU is extracted through a dc blocking ac circuit composed of a capacitor.

4. The airborne TRU output ripple voltage detection method of claim 1, wherein:

in step S2, sampling is performed by a positive half-wave sampling circuit composed of a diode, a capacitor, and an operational amplifier module.

5. The airborne TRU output ripple voltage detection method of claim 1, wherein:

before step S3, the method further includes amplifying the sampled signal by a triode.

6. The airborne TRU output ripple voltage detection method of claim 1, wherein:

in step S3, the peak value of the TRU ripple voltage is acquired via a peak sample-and-hold circuit composed of a transistor, a capacitor, and a resistor, where a discharge time constant composed of the capacitor and the resistor is set to a frequency with respect to the TRU ripple pulsation, and it is considered that discharge is not performed.

7. The airborne TRU output ripple voltage detection method of claim 1, wherein:

in step S4, the in-phase proportional amplifier circuit amplifies the voltage amplitude.

8. The airborne TRU output ripple voltage detection method of claim 1, wherein:

in step S5, isolation clipping is performed by the analog signal isolator.