Monitoring circuit for instantaneous disconnection of fisheye terminal and connecting hole in vibration test

Abstract

The utility model relates to the technical field of power device testing, in particular to a fisheye terminal and connecting hole transient disconnection monitoring circuit in a vibration test. Comprising a data acquisition card which is provided with a plurality of acquisition channels and is arranged in a monitoring device; a pin end of the to-be-tested power module is connected with a plurality of fisheye terminals, the fisheye terminals are arranged in connecting holes of the circuit board, the connecting holes are provided with first connecting points connected with a first end of one acquisition channel of the data acquisition card, and the fisheye terminals are provided with second connecting points connected with a second end of the acquisition channel. According to the utility model, through the arrangement of the fisheye terminal and connecting hole transient disconnection monitoring circuit, the pulse change during the transient disconnection of the fisheye terminal and the connecting hole is captured through the data acquisition card, and the long-time high-speed monitoring of the crimp transient disconnection of the fisheye terminal and the connecting hole can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of power device testing, and particularly relates to a monitoring circuit for instantaneous breakage between a fish-eye terminal and a connection hole in vibration testing. Background Art

[0002] The fish-eye terminal (pressfit) technology is an alternative solution to welding installation. It mainly realizes reliable connection of electrical contacts through a cold connection and solderless method. The fish-eye terminal is pressed into the PCB hole, and a high clamping force is obtained through a small pressing force. During the pressing process, the fish-eye terminal undergoes elastic deformation and provides a tight connection with low contact impedance and high reliability. Simply put, pressfit creates an electro-mechanical interconnection without soldering, and the connector can be quickly installed on the PCB module. The elimination of the soldering process not only reduces the connection impedance but also further reduces the production cost and assembly time.

[0003] However, during long-term use and in a vibration environment, instantaneous breakage may occur in the fish-eye terminal. The instantaneous breakage is caused by reasons such as material fatigue, oxidation, or mechanical stress of the fish-eye terminal or the PCB hole. In vibration testing, the requirements for data acquisition are very strict, and it is difficult for the existing technology to quickly identify and respond to connection abnormalities or instantaneous breakage situations. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a monitoring circuit for instantaneous breakage between a fish-eye terminal and a connection hole in vibration testing to solve the above technical problems;

[0005] The technical problems solved by the utility model can be realized by adopting the following technical solutions:

[0006] A monitoring circuit for instantaneous breakage between a fish-eye terminal and a connection hole in vibration testing includes:

[0007] A data acquisition card with multiple acquisition channels, which is arranged in the monitoring device;

[0008] A power module to be tested, the pin ends of the power module to be tested are connected with a plurality of fish-eye terminals, the fish-eye terminals are arranged in connection holes of a circuit board, and a first connection point connecting the first end of one of the acquisition channels of the data acquisition card is arranged on the connection hole, and a second connection point connecting the second end of the acquisition channel is arranged on the fish-eye terminal.

[0009] Preferably, it further includes parallel resistors corresponding to the number of the fish-eye terminals. The first end of one parallel resistor is connected to one first connection point, and the second end of the parallel resistor is connected to the corresponding second connection point.

[0010] Preferably, the fish-eye terminal is deformably arranged in the connection hole, and the second connection point is located at the lower end of the fish-eye terminal.

[0011] Preferably, it further includes

[0012] a first test point disposed on the circuit board, the first connection point is connected to the first connection point through the surface trace of the circuit board, and the first end of the acquisition channel is connected to the first connection point by connecting the first test point;

[0013] a second test point disposed on the circuit board, the second connection point is connected to the second connection point through the surface trace of the circuit board, and the second end of the acquisition channel is connected to the second connection point by connecting the second test point.

[0014] Preferably, it further includes an adapter board, the second test point is connected to the adapter board and connected to the data acquisition card through the z adapter board.

[0015] Preferably, it further includes a voltage source, the first end of the voltage source is connected to the first connection point, the second end of the voltage source is connected to the second connection point, and a supply voltage is output.

[0016] Preferably, the supply voltage does not exceed 5V.

[0017] Preferably, the number of acquisition channels of the data acquisition card is greater than or equal to the number of fish-eye terminals.

[0018] Preferably, the data acquisition card is connected to the expansion interface of the monitoring device, and the data acquisition card has a controllable pulse trigger range.

[0019] Preferably, the monitoring device is provided with a counter connected to the data acquisition card and a program control interface for setting parameters and displaying monitoring data.

[0020] Advantages of the present invention: Due to the above technical solutions, the present invention realizes long-term high-speed monitoring of the crimping break-off situation between the fish-eye terminal and the connection hole by setting a fish-eye terminal and a connection hole break-off monitoring circuit and capturing the pulse change when the fish-eye terminal and the connection hole are broken off through a data acquisition card. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the break-off monitoring circuit of a single fish-eye terminal in an embodiment of the present invention;

[0022] Figure 2 It is a connection diagram of the first fish-eye terminal in an embodiment of the present invention;

[0023] Figure 3 It is a connection diagram of the second fish-eye terminal in an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the connection of the third fish-eye terminal in the embodiment of the present utility model;

[0025] Figure 5 Schematic diagram of the connection of the fourth fish-eye terminal in the embodiment of the present utility model;

[0026] Figure 6 Schematic diagram of the connection of the fifth fish-eye terminal in the embodiment of the present utility model;

[0027] Figure 7 Schematic diagram of the connection of the sixth fish-eye terminal in the embodiment of the present utility model;

[0028] Figure 8 Schematic diagram of the connection of the seventh fish-eye terminal in the embodiment of the present utility model;

[0029] Figure 9 Schematic diagram of the voltage source in the embodiment of the present utility model;

[0030] Figure 10 Schematic diagram of the adapter board in the embodiment of the present utility model;

[0031] Figure 11 Schematic diagram of the hardware connection between the adapter board and the fish-eye terminal in the embodiment of the present utility model;

[0032] Figure 12 Flow chart of momentary break monitoring in the embodiment of the present utility model. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0034] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0035] Next, the present utility model will be further described in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation of the present utility model.

[0036] A momentary break monitoring circuit for fish-eye terminals and connection holes in vibration testing, as Figures 1 to 11 shown, includes,

[0037] A data acquisition card 1 with multiple acquisition channels, which is arranged in the monitoring device;

[0038] Power module to be measured, the pin ends of the power module to be measured are connected to a plurality of fisheye terminals 2, the fisheye terminals 2 are arranged in the connection holes of the circuit board, and a first connection point P1 connecting one end of one of the acquisition channels of the connection data acquisition card 1 is arranged on the connection hole, and the fisheye terminal 2 is provided with a second connection point P2 connecting the other end of the acquisition channel.

[0039] Specifically, the utility model can realize long-time high-speed monitoring of the instantaneous break of the press fit between the fisheye terminal 2 and the PCB connection hole. The principle of the monitoring scheme is that the first connection point P1 is welded and led out on the connection hole, and the second connection point P2 is welded and led out at the position close to the lower side of the fisheye terminal 2 of the power module to be measured under the PCB board. A power supply voltage is applied to both ends of the first connection point P1 and the second connection point P2, and the high-speed data acquisition card 1 detects the voltage at both ends of the first connection point P1 and the second connection point P2. If the fisheye terminal 2 is in good contact with the connection hole, the voltage at both ends of the first connection point P1 and the second connection point P2 is close to 0V. If the fisheye terminal 2 has an instantaneous break with the connection hole, the voltage at both ends of the first connection point P1 and the second connection point P2 is close to the applied power supply voltage value.

[0040] In a preferred embodiment, it further includes parallel resistors 3 corresponding to the number of fisheye terminals 2. The first end of one parallel resistor 3 is connected to a first connection point P1, and the second end of the parallel resistor 3 is connected to the corresponding second connection point P2.

[0041] Specifically, when an instantaneous break occurs between the fisheye terminal 2 and the connection hole, it will cause a sharp increase in the voltage difference, resulting in overcurrent or overvoltage conditions. The parallel resistor 3 can limit the change speed of the voltage, avoid circuit failures caused by sudden instantaneous breaks; at the same time, the parallel resistor 3 can help reduce electromagnetic interference in the circuit, ensure the data stability of the data acquisition card 1 during high-speed data acquisition, and help absorb or limit voltage spikes or reverse voltages caused by instantaneous breaks, thereby protecting the data acquisition card 1 from damage.

[0042] In a preferred embodiment, the fisheye terminal 2 is deformably arranged in the connection hole, and the second connection point P2 is located at the lower end of the fisheye terminal 2.

[0043] Specifically, the fisheye terminal 2 of the utility model realizes electrical contact by being pressed into the PCB connection hole in a solderless manner. During the pressing process, the fisheye terminal 2 undergoes elastic deformation and provides a tight connection with low contact impedance and high reliability.

[0044] In a preferred embodiment, it further includes

[0045] A first test point T1 arranged on the circuit board. The first connection point P1 is connected to the first connection point P1 through the surface trace of the circuit board, and the first end of the acquisition channel is connected to the first connection point P1 through the connection of the first test point T1.

[0046] The second test point T2 is provided on the circuit board. The second connection point P2 is connected to the second connection point P2 through the surface trace of the circuit board. The second end of the acquisition channel is connected to the second test point T2 and the second connection point P2.

[0047] Specifically, since the first connection point P1 and the second connection point P2 are directly provided on the connection hole and the fish-eye terminal 2, due to their installation positions, it is inconvenient to directly connect the first connection point P1 and the second connection point P2. Therefore, the present utility model leads out the first test point T1 and the second test point T2 which are convenient for connecting the data acquisition card 1. The first test point T1 is connected to the first connection point P1, and the second test point T2 is connected to the second connection point P2.

[0048] In a preferred embodiment, it further includes an adapter board 5. The second test point T2 is connected to the adapter board 5 and is connected to the data acquisition card 1 through the adapter board 5.

[0049] Specifically, the high-speed data acquisition card 1 is connected to the adapter board 5 through a patch cord, and the fish-eye terminal 2 is connected to the adapter board 5 through a lead on the circuit board.

[0050] In a preferred embodiment, it further includes a voltage source 4. The first end V+ of the voltage source 4 is connected to the first connection point P1, and the second end V- of the voltage source 4 is connected to the second connection point P2 to output a supply voltage.

[0051] In a preferred embodiment, the supply voltage does not exceed 5V.

[0052] Specifically, the voltage source 4 of the present utility model adopts low-voltage power supply, and the supply voltage is preferably 2V to 5V.

[0053] In a preferred embodiment, the number of acquisition channels of the data acquisition card 1 is greater than or equal to the number of fish-eye terminals 2.

[0054] Specifically, the present utility model adopts a data acquisition card 1 with 8 acquisition channels. The number of fisheye terminals 2 of the power module to be measured is 7, including a first fisheye terminal 21, a second fisheye terminal 22, a third fisheye terminal 23, a fourth fisheye terminal 24, a fifth fisheye terminal 25, a sixth fisheye terminal 26, and a seventh fisheye terminal 27. Correspondingly, the present utility model is provided with 7 first test points T1 and 7 second test points T2. The 7 first test points T1 respectively include test point T11, test point T12, test point T13, test point T14, test point T15, test point T16, and test point T17. The 7 second test points T2 respectively include test point T21, test point T22, test point T23, test point T24, test point T25, test point T26, and test point T27. Both ends of the first fisheye terminal 21 are connected to test point T11 and test point T21, and are connected to the first channel L1 of the adapter card; both ends of the second fisheye terminal 22 are connected to test point T12 and test point T22, and are connected to the second channel L2 of the adapter card; both ends of the third fisheye terminal 23 are connected to test point T13 and test point T23, and are connected to the third channel L3 of the adapter card; both ends of the fourth fisheye terminal 24 are connected to test point T14 and test point T24, and are connected to the fourth channel L4 of the adapter card; both ends of the fifth fisheye terminal 25 are connected to test point T15 and test point T25, and are connected to the fifth channel L5 of the adapter card; both ends of the sixth fisheye terminal 26 are connected to test point T16 and test point T26, and are connected to the sixth channel L6 of the adapter card; both ends of the seventh fisheye terminal 27 are connected to test point T17 and test point T27, and are connected to the seventh channel L7 of the adapter card; each fisheye terminal 2 is connected to the data acquisition card 1 and corresponding marks are made.

[0055] In a preferred embodiment, the data acquisition card 1 is connected to the expansion interface of the monitoring device, and the data acquisition card 1 has a controllable pulse trigger range.

[0056] Specifically, the pulse trigger range is 0V to 5V. For example, when the power supply voltage is powered on at 3V, the pulse trigger range is set to 2.5V. When an instantaneous break occurs, the voltage at both ends of the first connection point P1 and the second connection point P2 approaches the applied power supply voltage value of 3V, reaching the pulse trigger range, and the instantaneous break is recorded.

[0057] In a preferred embodiment, the monitoring device is provided with a counter connected to the data acquisition card 1 and a program-controlled interface for setting parameters and displaying monitoring data.

[0058] Specifically, the monitoring device can directly adopt a computer, which is internally provided with monitoring software for controlling the data acquisition card 1. The high-speed data acquisition card 1 is located at the expansion interface (PCIE interface) of the main board card of the computer.

[0059] In a specific embodiment, such as Figure 12As shown in the figure, the method for implementing the monitoring circuit of the present utility model includes:

[0060] Step 1: The high-speed data acquisition card 1 is located at the PCIE interface of the main board card of the monitoring device and is connected to the adapter board 5 through a patch cord. The fisheye terminal 2 of the power module to be measured is connected to the adapter board 5 through a lead wire.

[0061] Step 2: Check the hardware circuit connection. After confirming that there is no problem, power on the low-voltage power supply.

[0062] Step 3: Open the monitoring software in the monitoring device. The interface is initialized and historical monitoring data is read, which can avoid the loss of monitoring data in case of accidents.

[0063] Step 4: Set the corresponding parameters on the monitoring software according to the channels of the adapter board 5 used. For example, when the low-voltage power supply is powered on at 3V, the range of this channel is selected as 0V - 5V, and the trigger level is set at 2.5V.

[0064] Step 5: After all the used acquisition channels are set, click to open the device. The data acquisition card 1 is connected for communication, and the interface indicator light turns green and shows that it is connected.

[0065] Step 6: After switching the tab, click to start. The data acquisition card 1 starts to work, acquires the information of each acquisition channel and displays it on the oscilloscope display panel of the program control interface. If there is an instantaneous break between the fisheye terminal 2 and the connection hole, the voltage of the corresponding acquisition channel of the data acquisition card 1 becomes larger, approaching the set voltage of the low-voltage power supply. The monitoring data automatically records the number of pulses, which is the number of instantaneous breaks. When the monitoring count changes, the monitoring software automatically saves the monitoring data.

[0066] Step 7: After the test is completed, stop the operation of the monitoring software, turn off the device, power off the low-voltage power supply, and disconnect the hardware circuit in sequence.

[0067] The above is only a preferred embodiment of the present utility model, and does not limit the implementation manner and protection scope of the present utility model. For those skilled in the art, it should be able to realize that all the equivalent replacements and obvious changes made by using the description and illustrations of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A circuit for monitoring the instantaneous disconnection of a fisheye terminal and a connecting hole in a vibration test, characterized in that: include, A data acquisition card (1) with multiple acquisition channels is arranged in the monitoring device; A power module to be tested, wherein the pin end of the power module to be tested is connected to a plurality of fisheye terminals (2), the fisheye terminals (2) are arranged in connection holes of a circuit board, the connection hole is provided with a first connection point (P1) connected to the first end of one of the acquisition channels of the data acquisition card (1), and the fisheye terminal (2) is provided with a second connection point (P2) connected to the second end of the acquisition channel.

2. The circuit for monitoring the instantaneous disconnection of the fisheye terminal and the connection hole in the vibration test according to claim 1, characterized in that: It also includes parallel resistors (3) corresponding to the number of the fisheye terminals (2), wherein a first end of a parallel resistor (3) is connected to a first connection point (P1), and a second end of the parallel resistor (3) is connected to a corresponding second connection point (P2).

3. The circuit for monitoring the instantaneous disconnection of the fisheye terminal and the connecting hole in the vibration test according to claim 1, characterized in that: The fisheye terminal (2) is deformably arranged in the connection hole, and the second connection point (P2) is located at the lower end of the fisheye terminal (2).

4. The circuit for monitoring the instantaneous disconnection of the fisheye terminal and the connecting hole in the vibration test according to claim 1, characterized in that: Also includes, A first test point (T1) is provided on the circuit board, the first connection point (P1) is connected to the first connection point (P1) through a surface wiring of the circuit board, and the first end of the acquisition channel is connected to the first connection point (P1) by connecting the first test point (T1); A second test point (T2) is provided on the circuit board, the second connection point (P2) is connected to the second connection point (P2) through a surface wiring of the circuit board, and the second end of the acquisition channel is connected to the second connection point (P2) by connecting the second test point (T2).

5. The circuit for monitoring the instantaneous disconnection of the fisheye terminal and the connection hole in the vibration test according to claim 4, characterized in that: It also comprises an adapter plate (5), wherein the second test point (T2) is connected to the adapter plate (5) and is connected to the data acquisition card (1) via the adapter plate (5).

6. The circuit for monitoring the instantaneous disconnection of the fisheye terminal and the connecting hole in the vibration test according to claim 1, characterized in that: It also includes a voltage source (4), a first end of the voltage source (4) is connected to the first connection point (P1), and a second end of the voltage source (4) is connected to the second connection point (P2), outputting a supply voltage.

7. The circuit for monitoring the instantaneous disconnection of the fisheye terminal and the connecting hole in the vibration test according to claim 6, characterized in that: The supply voltage does not exceed 5V.

8. The circuit for monitoring the instantaneous disconnection of the fisheye terminal and the connecting hole in the vibration test according to claim 1, characterized in that: The number of the acquisition channels of the data acquisition card (1) is greater than or equal to the number of the fisheye terminals (2).

9. The circuit for monitoring the instantaneous disconnection of the fisheye terminal and the connecting hole in the vibration test according to claim 1, characterized in that: The data acquisition card (1) is connected to the expansion interface of the monitoring device, and the data acquisition card (1) has a controllable pulse trigger range.

10. The circuit for monitoring the instantaneous disconnection of the fisheye terminal and the connection hole in the vibration test according to claim 9, characterized in that: The monitoring device is provided with a counter connected to the data acquisition card (1) and a program control interface for setting parameters and displaying monitoring data.

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