CN106646269B - High-voltage power supply fault excitation monitoring device and monitoring method thereof - Google Patents

Abstract

The invention provides a high-voltage power supply fault excitation monitoring device, comprising: a high-voltage power supply module, whose key nodes are divided into two types: high-voltage nodes and low-voltage nodes; a random vibration test bench, which excites possible faults of the high-voltage power supply module under vibration stress mode; a low-voltage node switching conditioning module for conditioning the voltage signal of the low-voltage node within the allowable voltage measurement range; a low-voltage node data acquisition module for collecting and measuring the low-voltage nodes processed by the low-voltage node switching and conditioning module signal; a high-voltage node switching voltage divider module, used to divide the voltage signal of the high-voltage node into the allowable voltage measurement range; a high-voltage node data acquisition module, used to collect and measure the voltage drop through the high-voltage node switching voltage divider module The selected high-voltage node signal; the upper computer system is used to receive the low-voltage node signal and the high-voltage node signal, and issue a control command to control the switching of the corresponding node voltage signal.

Description

A high-voltage power supply fault excitation monitoring device and monitoring method thereof

technical field

The invention relates to the technical field of power supply monitoring, in particular to a high-voltage power supply fault excitation monitoring device and a testing method thereof.

Background technique

During the operation of the spacecraft, the reliable operation of the high-voltage power supply for aerospace is an important guarantee for the normal operation of the spacecraft. However, the space environment is extremely harsh and complex. In addition to the harsh launch environment, aerospace high-voltage power supplies have to withstand the combined effects of space environmental stress such as electricity, vibration and high temperature shock for a long time during the lift-off process and after entering the orbit for normal operation. This will cause the power supply to fail, causing significant damage.

Therefore, how to efficiently stimulate the possible failure modes of the high-voltage power supply and accurately monitor and diagnose the failure modes of the power supply has become a technical problem to be solved urgently by those skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to monitor the power failure mode that may be caused by vibration stress, use a random vibration test bench to provide high-acceleration vibration stress, excite the possible failure mode of the high-voltage power supply under vibration stress, and monitor the power supply in real time through the monitoring system. The voltage signal changes of each node and output help analyze the possible failure modes of high-voltage power supplies in a vibration environment and the weak links of power supply design.

In order to achieve the above purpose, the present invention first proposes a high-voltage power supply fault excitation monitoring device, including:

The high-voltage power supply module is a high-voltage power supply for aerospace. The key nodes in the circuit are divided into two types: high-voltage nodes and low-voltage nodes. The high-voltage node is a node with a voltage value higher than 400V, and the low-voltage node is a voltage value lower than 50V. node;

A random vibration test bench, connected to the high-voltage power module, provides vibration stress for the high-voltage power module, and excites possible failure modes of the high-voltage power module under vibration stress;

A low-voltage node switching conditioning module, connected to the low-voltage node in the high-voltage power supply module, and configured to adjust the voltage signal of the low-voltage node to an allowable voltage measurement range;

a low-voltage node data acquisition module, connected to the low-voltage node switching and conditioning module, for collecting and measuring the low-voltage node signal processed by the low-voltage node switching and conditioning module;

a high-voltage node switching voltage dividing module, which is connected to the high-voltage node in the high-voltage power supply module, and is used for dividing the voltage signal of the high-voltage node into an allowable voltage measurement range;

a high-voltage node data acquisition module, connected to the high-voltage node switching voltage-dividing module, for collecting and measuring the high-voltage node signal selected by the high-voltage node switching voltage-dividing module after being depressurized and selected;

The host computer system is connected to the low-voltage node data acquisition module and the high-voltage node data acquisition module at the same time, and is used to receive the low-voltage node signal and the high-voltage node signal, and issue a control command to control the switching of the corresponding node voltage Signal.

According to the high-voltage power supply fault excitation monitoring device proposed by the present invention, the low-voltage node switching conditioning module includes: a drive unit, a relay switching circuit, a voltage conditioning circuit, a main control unit and a serial communication unit;

The driving unit includes a decoding chip and a transistor array;

The relay switching circuit is composed of a plurality of relay switching units, and each relay unit includes a relay, a light-emitting diode and a resistor;

The voltage conditioning circuit is connected with the output end of the relay switching circuit and the low-voltage node data acquisition module; the voltage conditioning circuit includes an operational amplifier follower circuit and a voltage dividing circuit, and the output end of the relay switching module is connected to the voltage dividing circuit, The signal stepped down by the voltage divider circuit is isolated by the operational amplifier follower circuit and then input to the low-voltage node data acquisition module;

The serial communication unit is connected between the main control unit and the host computer system, and converts the RS2303 signal of the main control unit and the USB signal.

According to the high-voltage power supply fault excitation monitoring device proposed by the present invention, the high-voltage node switching voltage dividing module includes: a driving unit, a voltage dividing circuit, a relay switching circuit, a main control unit and a serial port communication unit.

According to the high-voltage power supply fault excitation monitoring device proposed by the present invention, the host computer system includes a test node selection module, a test data display module and a failure threshold setting module;

The test node selection module includes a node path selection button and a test node display lamp, so as to realize the selection of the test path of the high-voltage power supply module;

The test data display module includes a node voltage average display part, a node waveform display part and a storage path setting part, and the low voltage node data acquisition module and the high voltage node are connected through the storage path of the test data set by the storage path setting part. The test data transmitted by the data acquisition module to the host computer system is stored in the set storage path; the node voltage average value display part is used to display the voltage average value of all nodes of the high-voltage power supply module; the node waveform display part for selecting and displaying all node waveforms of a certain channel in the high-voltage power supply module;

The failure threshold setting module includes a failure threshold setting part and an alarm indicator light, and the failure threshold voltage output by the high-voltage power supply module is set through the failure threshold setting part.

The present invention also provides a high-voltage power supply fault excitation monitoring method, comprising the following steps:

S1: Place the high-voltage power module in the random vibration test bench, and connect the node leads of the high-voltage power module from the lead ports of the random vibration test bench to the low-voltage node switching conditioning module and the high-voltage node switching voltage divider module;

S2: Select the output channel of the high-voltage power supply module to be tested through the test node selection module of the host computer system;

S3: Set the storage path of the test data through the data display module of the host computer system;

S4: Set the upper and lower limit of the failure threshold of the three-way output of the high-voltage power supply module through the failure threshold setting module of the upper computer system;

S5: Set the vibration stress of the random vibration test bench, and after the vibration stress is stabilized after power-on, run the system program of the upper computer to control the switching, measurement, and transmission of the voltage signal data of each node;

S6: Use MATLAB to call the test data, and point out the weak links of the power supply design by analyzing the working state of the power supply under vibration stress, the failure mode, and the change trend of the node signal.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention provides vibration stress through a random vibration test bench, and excites the possible failure mode of the power supply under the vibration stress. At the same time, the device can accurately monitor the voltage signal changes of each node of the high-voltage power supply and the working state of the power supply in real time. Through MATLAB processing and analyzing data, the weak link of power supply design is found in the production design stage. At the same time, the invention is suitable for the state monitoring of most switching power supplies, has high portability, can provide a test platform for the state monitoring of other power supplies, and helps to analyze the failure mechanism of the switching power supply.

Description of drawings

1 is a schematic structural diagram of a specific implementation of a high-voltage power supply fault excitation monitoring system of the present invention;

Fig. 2 is the upper computer system structure diagram in the present invention;

3 is a schematic diagram of a low-voltage node voltage signal measurement principle in the present invention;

FIG. 4 is a schematic diagram of a high-voltage node voltage signal measurement principle in the present invention.

Detailed ways

A specific embodiment of the present invention will be described below with reference to FIG. 1. The high-voltage power supply fault excitation monitoring device in this embodiment includes a high-voltage power supply module (1), a random vibration test bench (2), a host computer system (3), and a low-voltage node switch. A conditioning module (4), a low-voltage node data acquisition module (5), a high-voltage node switching voltage divider module (6), and a high-voltage node data acquisition module (7);

The high-voltage power supply module (1) selects a certain type of high-voltage power supply for aerospace, with three outputs, and the key nodes in each part of the circuit are divided into two types: high-voltage nodes and low-voltage nodes. The high-voltage node is a node whose voltage value is higher than 400V, and the low-voltage node is a node whose voltage value is lower than 50V.

The random vibration test bench (2) adopts a high-accelerated reliability test box of QualMark Typhoon 2.5 of QualMark Company, which provides vibration stress to the high-voltage power module (1) and stimulates its possible failure modes under the vibration stress.

The host computer system (3) is connected with the low-voltage node switching and conditioning module (4), the low-voltage node data acquisition module (5), the high-voltage node switching voltage dividing module (6), and the high-voltage node data acquisition module (7), and the host computer system ( 3) Sending control instructions to the low-voltage node switching conditioning module (4) and the high-voltage node switching voltage dividing module (6) to control the switching of corresponding node voltage signals. The low-voltage node data acquisition module (5) and the high-voltage node data acquisition module (6) transmit the test data to the upper computer system (3).

The low-voltage node switching and conditioning module (4) is connected to the low-voltage node of the high-voltage power supply module (1), switches the corresponding node according to the control command sent by the upper computer system, and adjusts the low-voltage node voltage signal of the high-voltage power supply module (1) to The low-voltage node data acquisition module (5) is within the allowable voltage measurement range.

The low-voltage node data acquisition module (5) is connected to the output end of the low-voltage node switching and conditioning module (4) and the host computer system, so as to collect and measure the node voltage signal processed by the low-voltage node switching and conditioning module (4), and transmit the signal through the PCI bus. The measurement data is uploaded to the upper computer system (3).

The high-voltage node switching voltage divider module (6) is connected to the high-voltage node of the high-voltage power supply module (1) and the upper computer system (3), and divides the high-voltage node voltage signal of the high-voltage power supply (1) to a level allowed by the high-voltage node data acquisition module. Within the voltage measurement range, switch the corresponding high-voltage node according to the control command sent by the upper computer system (3).

The high-voltage node data acquisition module (7) is connected with the high-voltage node switching voltage dividing module (6) and the host computer system (3), and is used for collecting and measuring the high-voltage node signal after the voltage reduction and selection by the high-voltage node switching voltage dividing module (6), And transmit the test data to the upper computer system (3) through LAN.

2, the host computer system (3) in the present invention includes a test node selection module (3-1), a test data display module (3-2), and a failure threshold setting module (3-3).

The test node selection module (3-1) is composed of a node channel selection button and a test node display lamp, which can realize the selection of the test channel of the high-voltage power supply module (1), and according to the selection result, the host computer system (3) switches to the low-voltage node for conditioning The module (4) and the high-voltage node switching voltage dividing module (6) send test instructions to control the switching to measure the node voltage signals of all nodes in the selected test path.

The test data display module (3-2) consists of a node voltage average display part (3-2-1), a node waveform display part (3-2-2) and a storage path setting part (3-2-3). Through the storage path of the test data set by the storage path setting part (3-2-3), the test data transmitted from the low-voltage node data acquisition module (5) and the high-voltage node data acquisition module (6) to the upper computer is stored in the set storage path. in the path. The node voltage average value display part (3-2-1) displays the voltage average value of all nodes of the high voltage power supply module (1). The node waveform display part (3-2-3) can choose to display all node waveforms of a certain channel of the high voltage power supply module (1).

The failure threshold setting module (3-3) consists of a failure threshold setting part (3-3-1) and an alarm indicator light (3-3-2). The high voltage power supply module is set through the failure threshold setting part (3-3-1). (1) Failure threshold voltage of three outputs. The alarm indicator light is green when the high voltage power supply module (1) is working normally. When the output voltage of the high voltage power supply module (1) exceeds the failure threshold range, the alarm indicator (3-3-2) turns red.

Please continue to refer to FIG. 3, the low-voltage node switching conditioning module (4) in the present invention includes a driving unit (4-1), a relay switching circuit (4-2), a voltage conditioning circuit (4-3), a main control unit (4) -4), serial communication unit (4-5) Among them:

The driving unit (4-1) is composed of a decoding chip (4-1-1) and a transistor array (4-1-2). The decoding chip (4-1-1) selects the 74LS238 chip, the input terminal of which is connected to the IO pins of the main control unit (4-4), and the output terminal of the decoding chip (4-1-1) is connected to the transistor array (4- 1-2), the transistor array (4-1-2) selects ULN2003.

The relay switching circuit (4-2) is composed of a plurality of relay switching units (4-2-1), each relay unit is composed of a relay (4-2-2), a light emitting diode (4-2-3) and a resistor (4 -2-4) Composition. The +5V power supply terminal of the relay (4-2-2) is connected to the anode of the light-emitting diode (4-2-3). Two ends of the resistor (4-2-4) are respectively connected to the cathode of the diode (4-2-3) and the control terminal of the relay (4-2-2). The control port of the relay (4-2-2) is connected to the output port of the transistor array (4-1-2) of the drive unit (4-1), and each output port of the transistor array (4-1-2) is connected to two The control terminal of the relay control unit. The normally open contact of the relay (4-2-2) is connected to the input end of the voltage conditioning circuit (4-3), and the low voltage node signal of the high voltage power supply module (1) is connected to the moving contact of the relay (4-2-2). superior.

The voltage conditioning circuit (4-3) is connected with the output end of the relay switching circuit (4-2) and the low-voltage node data acquisition module (5). The voltage conditioning circuit (4-3) is composed of an operational amplifier follower circuit (4-3-1) and a voltage divider circuit (4-3-2), and the output end of the relay switching module (4-2) is connected to the voltage divider circuit (4-3-2). -3-2), the signal stepped down by the voltage divider circuit (4-3-2) is isolated by the operational amplifier follower circuit (4-3-1) and then input to the low-voltage node data acquisition module (5).

The main control unit (4-4) is STM32, the model is F103ZET6.

The serial communication unit (4-5) is connected between the main control unit (4-4) and the host computer system (3), and converts the RS2303 signal of the main control unit (4-4) with the USB signal.

The low-voltage node data acquisition module (5) in this embodiment adopts a PCI1714UL model data acquisition board. The input end of the data acquisition board is connected with the output end of the low-voltage node switching and conditioning module (4), and the data acquisition board transmits the collected and measured low-voltage node voltage signals to the host computer system (3) via the PCI bus.

Please continue to refer to FIG. 4, the high-voltage node switching voltage dividing module (6) in the present invention includes: a driving unit (6-1), a voltage dividing circuit (6-2), a relay switching circuit (6-3), a main control unit (6-4), serial communication unit (6-5), of which:

The driving unit (6-1) is composed of a decoding chip (6-1-1) and a transistor array (6-1-2). The decoding chip (6-1-1) selects the 74LS238 chip, the input terminal of which is connected to the IO pin of the main control unit (6-4), and the output terminal of the decoding chip (6-1-1) is connected to the transistor array (6- 1-2), the transistor array (6-1-2) selects ULN2003.

The voltage dividing circuit (6-2) is composed of multi-stage voltage dividing resistors. The input end of the voltage dividing circuit (6-2) is connected with the high voltage node of the high voltage power supply module (1), and the output end of the voltage dividing circuit (6-2) is connected with the input end of the relay switching circuit (6-3).

The relay switching circuit (6-3) is composed of a plurality of relay switching units (6-3-1), each relay unit is composed of a relay (6-3-2), a light emitting diode (6-3-3) and a resistor (6 -3-4) Composition. The +5V power supply terminal of the relay (6-3-2) is connected to the anode of the light-emitting diode (6-3-3). Two ends of the resistor (6-3-4) are respectively connected to the cathode of the diode (6-3-3) and the control terminal of the relay (6-3-2). The control port of the relay (6-3-2) is connected to the output port of the transistor array (6-1-2) of the drive unit (6-1), and each output port of the transistor array (6-1-2) is connected to a relay Control side of the control unit. The normally open contact of the relay (6-3-2) is connected to the oscilloscope probe in the corresponding high-voltage node acquisition module (7). ) are connected to the moving contacts.

The main control unit (6-4) of the high-voltage node switching voltage dividing module (6) and the main control unit (4-4) of the low-voltage node switching and conditioning module (4) are the same main control unit.

The serial communication unit (6-5) of the high-voltage node switching voltage dividing module (6) and the serial communication unit (4-5) of the low-voltage node switching and conditioning module (4) are the same serial communication unit.

The high-voltage node data acquisition module (7) in this embodiment adopts a dual-channel oscilloscope, and the model is DSO5012A. The host computer system (3) is connected to the oscilloscope through the network port, and uses VISA to send the standard command of programmable instrument (SCPI) to the oscilloscope DSO5012A to control the oscilloscope to measure and transmit the high-voltage node voltage processed by the high-voltage node switching voltage divider module (6). signal data.

In addition, the present invention also provides a monitoring method corresponding to the German high-voltage power supply fault excitation monitoring device in FIG. 1, comprising the following steps:

S1: Place the high-voltage power module (1) in the random vibration test bench (2), and lead the node leads of the high-voltage power module (1) from the lead ports of the random vibration test bench (2) to switch the conditioning modules to the low-voltage nodes respectively. (4) Connect with the high-voltage node switching voltage divider module (6).

S2: Select the output path of the high-voltage power supply module (1) to be tested through the test node selection module (3-1) of the host computer system (3).

S3: The storage path of the test data is set through the data display module (3-2) of the upper computer system (3).

S4: Set the upper and lower limits of the failure threshold of the three-way output of the high-voltage power supply module (1) through the failure threshold setting module (3-3) of the upper computer system (3).

S5: Set the vibration stress of the random vibration test bench (2), and after the vibration stress is stabilized after power-on, run the program of the upper computer system (3) to control switching, measurement, and transmission of voltage signal data of each node.

S6: Use MATLAB to call the test data, and point out the weak links of the power supply design by analyzing the working state of the power supply under vibration stress, the change trend of the node signal, the failure mode, etc.

The above description of the present invention is illustrative rather than restrictive, and those skilled in the art will understand that many modifications, changes or equivalents may be made within the spirit and scope defined by the claims, but they will all fall within the scope of the claims. within the protection scope of the present invention.

Claims (2)

1. A high voltage power supply fault excitation monitoring device, comprising:

the high-voltage power supply module is a high-voltage power supply for spaceflight, key nodes in a circuit of the high-voltage power supply module are divided into a high-voltage node and a low-voltage node, the high-voltage node is a node with a voltage value higher than 400V, and the low-voltage node is a node with a voltage value lower than 50V;

the random vibration test bed is connected with the high-voltage power supply module, provides vibration stress for the high-voltage power supply module, and excites a fault mode which may appear in the high-voltage power supply module under the vibration stress;

the low-voltage node switching and conditioning module is connected with the low-voltage node in the high-voltage power supply module and is used for conditioning a voltage signal of the low-voltage node to be within an allowable voltage measurement range;

the low-voltage node data acquisition module is connected with the low-voltage node switching and conditioning module and is used for acquiring and measuring low-voltage node signals processed by the low-voltage node switching and conditioning module;

the high-voltage node switching voltage division module is connected with the high-voltage node in the high-voltage power supply module and is used for dividing the voltage signal of the high-voltage node into an allowable voltage measurement range;

the high-voltage node data acquisition module is connected with the high-voltage node switching and voltage dividing module and is used for acquiring and measuring high-voltage node signals subjected to voltage reduction selection through the high-voltage node switching and voltage dividing module;

an upper computer system which is connected with the low-voltage node data acquisition module and the high-voltage node data acquisition module at the same time and is used for receiving the low-voltage node signals and the high-voltage node signals and sending out control instructions to control the switching of corresponding node voltage signals,

wherein, the low-voltage node switching and conditioning module comprises: the device comprises a driving unit, a relay switching module, a voltage conditioning circuit, a main control unit and a serial port communication unit;

the driving unit comprises a decoding chip and a transistor array;

the relay switching module consists of a plurality of relay switching units, and each relay unit comprises a relay, a light-emitting diode and a resistor;

the voltage conditioning circuit is connected with the output end of the relay switching module and the low-voltage node data acquisition module; the voltage conditioning circuit comprises an operational amplifier follower circuit and a voltage division circuit, the output end of the relay switching module is connected with the voltage division circuit, and a signal which is subjected to voltage reduction by the voltage division circuit is isolated by the operational amplifier follower circuit and then is input into the low-voltage node data acquisition module;

the serial port communication unit is connected between the main control unit and the upper computer system and converts RS2303 signals of the main control unit and USB signals

The high-voltage node switching voltage division module comprises: a driving unit, a voltage division circuit, a relay switching module, a main control unit and a serial port communication unit,

the upper computer system comprises a test node selection module, a test data display module and a failure threshold setting module;

the test node selection module comprises a node access selection button and a test node display lamp and is used for selecting the test access of the high-voltage power supply module;

the test data display module comprises a node voltage average value display part, a node waveform display part and a storage path setting part, a storage path of test data is set through the storage path setting part, and the test data transmitted to the upper computer system by the low-voltage node data acquisition module and the high-voltage node data acquisition module is stored in a storage space corresponding to the set storage path; the node voltage average value display part is used for displaying the voltage average value of all nodes of the high-voltage power supply module; the node waveform display part is used for selectively displaying all node waveforms of a certain passage in the high-voltage power supply module;

the failure threshold setting module comprises a failure threshold setting part and an alarm indicator lamp, and the failure threshold voltage output by the high-voltage power supply module is set through the failure threshold setting part.

2. A high-voltage power failure excitation monitoring method applied to the high-voltage power failure excitation monitoring device according to claim 1, comprising the steps of:

s1: the high-voltage power supply module is placed in a random vibration test bed, and node lead wires of the high-voltage power supply module are led out from a lead port of the random vibration test bed and are respectively connected with a low-voltage node switching conditioning module and a high-voltage node switching voltage-dividing module;

s2: selecting an output channel of a high-voltage power supply module to be tested through a test node selection module of the upper computer system;

s3: setting a storage path of test data through a test data display module of the upper computer system;

s4: setting the upper and lower limits of the failure threshold values of the three outputs of the high-voltage power supply module through a failure threshold value setting module of the upper computer system;

s5: setting the vibration stress of a random vibration test bed, running an upper computer system program after the vibration stress is stabilized after the random vibration test bed is powered on, and controlling, switching, measuring and transmitting voltage signal data of each node;

s6: and (3) using MATLAB to call test data, and indicating weak links of power supply design by analyzing the working state of the power supply under the vibration stress, the change trend of node signals and the fault mode.

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