Testing device

Abstract

The invention provides a testing device. The testing device comprises an access device, a power supply module, a sampling module and a main control module. The access device is provided with a first connecting piece and a second connecting piece which are used for accessing two ends of a to-be-tested signal line; the first sampling piece and the second sampling piece are used for being connected to the two ends of a to-be-tested area on a to-be-tested signal line; the power supply module is electrically connected with the access device and is used for outputting a reference electric signal to a to-be-tested signal line through the first connecting piece and the second connecting piece, and the sampling module is electrically connected with the access device. The invention aims to realize the detection of the direct current resistance of the signal line of the product with the Hotbar process, so that the yield of the product with the Hotbar process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of product testing, and in particular to a testing device. Background Art

[0002] The hotbar process is also called hot-pressed tin-melting welding process. Its principle is to first print the solder paste on the circuit board, and then use heat to melt the solder and connect and conduct the two electronic devices that need to be connected. This process is often used to weld the flexible circuit board (FPC Flexible Printed Circuit) on the circuit board, thereby effectively reducing costs and reducing the number of flexible circuit board connectors. However, in the process of hot-pressed tin-melting welding, it is necessary to manually align the two devices to be welded, that is, to align the signal lines of the same network on the two devices to be welded together, so that after hot-pressed tin-melting welding, the signal lines of the same network on the two devices to be welded can be welded together. However, there is a risk of poor welding in the above welding process, such as cold welding, false welding, welding deviation, etc., which leads to abnormal signals transmitted on the signal lines corresponding to the connection of the flexible circuit board and the circuit board during the working process of the product with hot-pressed tin-melting welding process, which greatly reduces the yield rate of products with hot-pressed tin-melting welding process. Therefore, how to detect the above-mentioned poor welding after welding has become a technical problem that urgently needs to be solved. Summary of the invention

[0003] The main purpose of the present invention is to provide a testing device, which aims to detect the welding state of the welding point of the signal line in the product with Hotbar process, so as to improve the yield rate of the product with Hotbar process.

[0004] To achieve the above object, the present invention provides a testing device comprising:

[0005] An access device, the access device having a first connector and a second connector for accessing two ends of a signal line to be tested; and a first sampling member and a second sampling member for accessing two ends of a test area on the signal line to be tested;

[0006] A power supply module, the power supply module is electrically connected to the access device and is used to output a reference electrical signal to the signal line to be tested via the first connector and the second connector;

[0007] A sampling module, the sampling module is electrically connected to the access device and is used to collect the voltage at both ends of the test area on the test signal line through the first sampling device and the second sampling device, and output a corresponding voltage detection signal;

[0008] The main control module is used to determine the welding state of the welding point on the signal line to be tested according to the reference electrical signal and the voltage detection signal.

[0009] Optionally, the power supply module includes:

[0010] A voltage source module, the voltage source module is electrically connected to the access device and applies a preset voltage signal to both ends of the signal line to be tested via the first connector and the second connector;

[0011] A constant current source module is electrically connected to the access device and outputs a preset current signal to the signal line to be tested via the first connector and the second connector.

[0012] Optionally, the reference electrical signal includes a preset current signal;

[0013] The main control module is used to determine the voltage at both ends of the area to be tested and the current flowing through the area to be tested according to the preset current signal and the voltage detection signal, and calculate the resistance value of the area to be tested;

[0014] When the resistance value of the resistor is not within the preset resistance value range, the main control module determines that the welding of the welding point on the signal line to be tested is abnormal;

[0015] When the resistance value of the resistor is within the preset resistance value range, the main control module determines that the welding of the welding point on the signal line to be tested is normal.

[0016] Optionally, the reference electrical signal includes a preset current signal; the preset current signal includes a first preset current signal and a second preset current signal; the voltage detection signal includes a first voltage detection signal and a second voltage detection signal;

[0017] The main control module is used to control the power supply module to output the first preset current signal and obtain the corresponding first voltage detection signal through the sampling module, and then control the power supply module to output the second preset current signal and obtain the corresponding second voltage detection signal through the sampling module; and obtain the resistance value of the area to be tested according to a preset calculation formula;

[0018] When the resistance value of the resistor is not within the preset resistance value range, the main control module determines that the welding of the welding point on the signal line to be tested is abnormal;

[0019] When the resistance value on the signal line to be tested is within the preset resistance value range, the main control module determines that the welding of the welding point on the signal line to be tested is normal;

[0020] The default calculation formula is:

[0021]

[0022] Among them, I2 is the second current determined by the main control module according to the second preset current signal, I1 is the first current determined by the main control module according to the first preset current signal, V2 is the second voltage determined by the main control module according to the second voltage detection signal, and V1 is the first voltage determined by the main control module according to the first voltage detection signal.

[0023] Optionally, the power supply module is further configured to output a preset voltage signal corresponding to the voltage setting signal when receiving the voltage setting signal.

[0024] Optionally, the sampling module includes:

[0025] A differential amplifier module, wherein a first input end of the differential amplifier module is electrically connected to the first sampling component, and a second output end of the differential amplifier module is electrically connected to the second sampling component;

[0026] The differential amplifier module is used to perform a differential amplification on the first voltage collected at one end of the test area by the first sampling device and the second voltage collected at the other end of the test area by the second sampling device, and then output a corresponding voltage detection signal after amplifying the difference according to a preset amplification factor.

[0027] Optionally, the sampling module further includes:

[0028] A buffer circuit, wherein the input end of the buffer circuit is connected to the output end of the differential amplifier module, and the output end of the buffer circuit is electrically connected to the main control module.

[0029] Optionally, the differential amplifier module further has an amplification factor setting terminal, and the sampling module further includes a variable resistance module;

[0030] The variable resistor module is electrically connected to the amplification factor setting terminal of the differential amplifier module, and is used to set its own resistance value according to the received trigger signal, or to adjust its own resistance value accordingly when triggered by the user;

[0031] The differential amplifier module is used to set its own preset amplification factor according to the resistance value of the variable resistor module.

[0032] Optionally, the first connecting member, the second connecting member, the first sampling member and the second sampling member form a detection end group, and the access device has a plurality of the detection end groups.

[0033] Optionally, the access device further includes a first switch module and a second switch module;

[0034] The first switch module is electrically connected to the first connecting member, the second connecting member, the power supply module and the main control module respectively;

[0035] The second switch module is electrically connected to the first sampling component, the second sampling component, the power supply module and the main control module respectively;

[0036] The main control module is used to control the actions of the first switch module and the second switch module so that the power supply module is connected to the two ends of the corresponding signal line to be tested, and the sampling module is connected to the two ends of the test area in the corresponding signal line to be tested.

[0037] Optionally, the main control module is used to control the operation of the first switch module and the second switch module when receiving test signals in sequence, so that the power supply module and the sampling module are connected to each detection end group in sequence; and determine the welding status of the welding points on the multiple signal lines to be tested based on the acquisition of the multiple reference electrical signals and the multiple voltage detection signals.

[0038] Optionally, when receiving a voltage stabilizing device test signal, the main control module controls the sampling module to collect the forward voltage and reverse voltage at both ends of the test area on the signal line to be tested through the first sampling device and the second sampling device, and determines the state of the voltage stabilizing device on the signal line to be tested based on the forward voltage and the reverse voltage.

[0039] Optionally, the testing device further includes:

[0040] A prompt module is electrically connected to the main control module; the main control module is also used to control the prompt module to prompt the welding status.

[0041] The test device of the present invention includes an access device, a power supply module, a sampling module and a main control module; wherein the access device has a first connector and a second connector for accessing the two ends of the signal line to be tested, and a first sampling component and a second sampling component for accessing the two ends of the test area on the signal line to be tested. The power supply module is used to output a reference electrical signal to the signal line to be tested via the first connector and the second connector, the sampling module is used to collect the voltage at the two ends of the test area on the signal line to be tested via the first sampling component and the second sampling component and output a corresponding voltage detection signal, and the main control module is used to determine the welding state of the welding point on the signal line to be tested according to the reference electrical signal and the voltage detection signal. Through the above-mentioned setting, the test device can detect the DC resistance of the corresponding signal line on the current flexible circuit and the circuit board, so as to judge the welding state of the welding point of the current signal line, that is, to judge the welding state of the gold finger of a signal line on the flexible circuit board and the pad corresponding to the signal line on the circuit board. Thus, in practical applications, the testing device of the present invention realizes the detection of the welding status of the welding points of the signal lines in the products with Hotbar process, so that the user can judge whether the current flexible circuit board and the circuit board have poor welding according to the results of the welding status detection, thereby effectively improving the production yield of the products with Hotbar process. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical methods in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0043] Figure 1 A schematic diagram of a circuit module of an embodiment of a testing device of the present invention;

[0044] Figure 2 A schematic diagram of a circuit module of another embodiment of a testing device of the present invention;

[0045] Figure 3 A schematic diagram of a circuit module of another embodiment of a testing device of the present invention;

[0046] Figure 4 A schematic diagram of a circuit module of another embodiment of a testing device of the present invention;

[0047] Figure 5 A schematic diagram of a circuit module of another embodiment of a testing device of the present invention;

[0048] Figure 6 A schematic diagram of a circuit module of another embodiment of a testing device of the present invention;

[0049] Figure 7 Schematic diagram of Hotbar process welding between flexible circuit board and circuit board.

[0050] Description of Figure Numbers:

[0051] Label name Label name 10 Access device 11 First connecting piece 12 Second connecting piece 13 First sample 14 The second sample 15 First switch module 16 Second switch module 17 The third switch module 20 Power supply module 21 Voltage source module 22 Constant current source module 30 Sampling Module 31 Differential amplifier module 32 Buffer Circuit 40 Main control module

[0052] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical methods in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical methods between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical methods is contradictory or cannot be implemented, it should be deemed that such a combination of technical methods does not exist and is not within the scope of protection required by the present invention.

[0057] The hotbar process is also called hot-pressed tin-melting welding process. Its principle is to first print the solder paste on the circuit board, and then use heat to melt the solder and connect and conduct the two electronic devices that need to be connected. This process is often used to weld the flexible circuit board (FPC Flexible Printed Circuit) on the circuit board, thereby effectively reducing costs and reducing the number of flexible circuit board connectors. However, in the process of hot-pressed tin-melting welding, it is necessary to manually align the two devices to be welded, that is, to align the signal lines of the same network on the two devices to be welded together, so that after hot-pressed tin-melting welding, the signal lines of the same network on the two devices to be welded can be welded together. However, there is a risk of poor welding in the above welding process, such as cold welding, false welding, welding deviation, etc., which leads to abnormal signals transmitted on the signal lines corresponding to the connection of the flexible circuit board and the circuit board during the working process of the product with hot-pressed tin-melting welding process, which greatly reduces the yield rate of products with hot-pressed tin-melting welding process. Therefore, how to detect the above-mentioned poor welding after welding has become a technical problem that urgently needs to be solved.

[0058] For this purpose, refer to Figure 1 In one embodiment of the present invention, the present invention provides a testing device comprising:

[0059] An access device 10, the access device 10 has a first connector 11 and a second connector 12 for accessing two ends of a signal line to be tested; and a first sampling member 13 and a second sampling member 14 for accessing two ends of a test area on the signal line to be tested;

[0060] A power supply module 20, which is electrically connected to the access device 10 and is used to output a reference electrical signal to the signal line to be tested via the first connector 11 and the second connector 12;

[0061] The sampling module 30 is electrically connected to the access device 10 and is used to collect the voltage at both ends of the test area on the test signal line through the first sampling element 13 and the second sampling element 14, and output a corresponding voltage detection signal;

[0062] The main control module 40 is used to determine the welding state of the welding point on the signal line to be tested according to the reference electrical signal and the voltage detection signal.

[0063] Understandably, reference Figure 7 , Figure 7The figure shows a schematic diagram of the connection between a circuit board and a flexible circuit board (FPC). The circuit board is provided with a plurality of connection pads for signal lines, such as pad P1 electrically connected to signal line L1a. Signal line L1b and pad P1' electrically connected to signal line L1b are provided on the flexible circuit board corresponding to signal line L1a. When pad P1 and pad P1' are aligned and welded together by a hot-pressing tin-melting welding process, signal line L1a and signal line L1b are connected together to form signal line L1. At this time, the device on the circuit board connected to signal line L1 and the device on the board connected to the other end of the flexible circuit board can establish electrical connection with each other through signal line L1.

[0064] In this embodiment, the access device 10 may include an access seat, and a first connector 11, a second connector 12, a first sampling member 13, and a second sampling member 14 arranged on the access seat. The first connector 11, the second connector 12, the first sampling member 13, and the second sampling member 14 may establish an electrical connection path through a corresponding circuit module in the electrical connection line test device. The access seat may be used to place a circuit board provided with a signal line to be tested and a flexible circuit board welded to the circuit board.

[0065] Among them, the first connector 11 and the second connector 12 can be implemented by connectors corresponding to the connectors on the circuit board, such as TYPE-C / Lightning / Micro-USB, etc. It can be understood that since the flexible circuit board and the signal line on the circuit board are basically under the solder mask, it is impossible to directly establish an electrical connection path with external devices. Therefore, considering that the essential function of the flexible circuit board is to connect two circuit boards to achieve signal transmission, if it is necessary to output a reference electrical signal on the signal line to be tested, then the power supply module 20 can be electrically connected to the signal line to be tested from the two external connectors corresponding to the signal line on the two flexible circuit boards connected at both ends of the flexible circuit board. For example, refer to Figure 1 , Figure 1 , which shows the connection relationship of a signal line to be tested on a flexible circuit board. When the flexible circuit board is welded on PCB1 by hot pressing tin melting welding process, one end of the signal line to be tested is electrically connected to the connector on PCB1, and the other end is electrically connected to the connector on PCB2. At this time, the first connector 11 can be connected to the connector, and the second connector 12 can be connected to the second connector 12, so as to output a reference electrical signal to the signal line to be tested.

[0066] In this embodiment, the test area can be the welding point between the flexible circuit board and the circuit board, or the signal line to be tested. The first sampling piece 13 and the second sampling piece 14 can be implemented by using probes. The user can press the first sampling piece 13 and the second sampling piece 14 on the test area to be tested, for example Figure 1 The two ends of the welding point A and B can also be directly touched on Figure 1 On the corresponding pins of the two connectors. It can be understood that a pressing piece with adjustable height can be provided on the test device, and the first sampling piece 13 and the second sampling piece 14 can be movably set on the side of the pressing piece facing the signal line to be tested, for example, they can be movably set in a slide groove, and the position of the slide groove just corresponds to the position of the signal line to be tested. At this time, the user can adjust the position of the first sampling piece 13 and the second sampling piece 14 in the slide groove according to the requirements of the position of the area to be tested, and when starting the test, press the pressing piece down so that one end of the first sampling piece 13 and the second sampling piece 14 just presses on the corresponding position of the signal line to be tested, for example, one presses on one end A of the welding place, and the other presses on the other end B of the welding place. Through the above-mentioned setting, the sampling piece and the connecting piece are distinguished, and the user can select the position of the required area to be tested by himself, which improves the convenience of the user in using the test device.

[0067] In this embodiment, the main control module 40 can be implemented by a main controller, such as MCU, DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), PLC, SOC (System On Chip), etc.

[0068] In this embodiment, optionally, the sampling module 30 can be implemented by an analog-to-digital conversion module, the first input end of the analog-to-digital conversion module is electrically connected to the first sampling component 13, and the second input end of the analog-to-digital conversion module is electrically connected to the sampling component. The analog-to-digital conversion module can perform analog-to-digital conversion on the voltage signal at one end of the test area collected by the first sampling component 13 and output a first voltage signal, and perform analog-to-digital conversion on the voltage at the other end of the test area collected by the second sampling room and output a second voltage signal. The voltage detection signal includes a first voltage signal and a second voltage signal. The main control module 40 can obtain the voltage value on the actual test area according to the first voltage signal and the second voltage signal.

[0069] Optionally, in another embodiment, the sampling module 30 includes:

[0070] A differential amplifier module 31, wherein a first input end of the differential amplifier module 31 is electrically connected to the first sampling component 13, and a second output end of the differential amplifier module 31 is electrically connected to the second sampling component 14;

[0071] The differential amplifier module 31 is used to perform differential amplification according to a preset amplification factor on the first voltage collected at one end of the test area by the first sampling element 13 and the second voltage collected at the other end of the test area by the second sampling element 14, and then output a corresponding voltage detection signal.

[0072] In this embodiment, the differential amplifier module 31 can be implemented by a differential amplifier chip or a differential amplifier device, such as a differential amplifier. The differential amplifier module 31 can perform differential amplification on the voltage at both ends of the test area through the first sampling device 13 and the second sampling device 14, and then output a corresponding voltage detection signal. The voltage value of the voltage detection signal is the voltage at both ends of the test area after amplification by a preset amplification factor. After the main control module 40 obtains the voltage detection signal through its own ADC port, it can determine the actual voltage at both ends of the test area according to the voltage value of the voltage detection signal and the known preset amplification factor. Among them, the preset amplification factor in the main control module 40 is set in advance in the main control module 40 by the R&D personnel.

[0073] It should be understood that, since the welding conditions of the welding points of different signal lines to be tested are different, and the impedance of the signal lines to be tested is also different, in order to facilitate the subsequent main control circuit to effectively identify the voltage value of the current voltage detection signal. In one embodiment of the present invention, the differential amplifier module 31 also has an amplification factor setting terminal, and the sampling module 30 also includes a variable resistance module;

[0074] The variable resistor module is electrically connected to the amplification factor setting terminal of the differential amplifier module 31, and is used to set its own resistance value according to the received trigger signal, or to adjust its own resistance value accordingly when triggered by the user;

[0075] The differential amplifier module 31 is used to set its own preset amplification factor according to the resistance value of the variable resistor module.

[0076] In this embodiment, optionally, the variable resistance module can be a variable resistance chip electrically connected to the main control module 40. The user can touch the trigger module set on the test device, or trigger the external terminal, so that the main control module 40 receives the corresponding resistance setting signal. After receiving the resistance setting signal, the main control module 40 can control the variable resistance chip to work, so as to adjust its resistance to the resistance corresponding to the resistance setting signal, so that the preset magnification of the current differential amplifier module 31 is adjusted to the magnification required by the user. Optionally, the variable resistance module can also be implemented by a variable resistor. The user can change the resistance of the variable resistor by toggling the corresponding structure on the variable resistor, so that the preset magnification of the current differential amplifier module 31 is adjusted to the magnification required by the user. In this way, through the above setting, the test device can be compatible with the detection of Hotbar process signal lines with different welding states and types, thereby improving the comprehensiveness of the detection of the test device.

[0077] It is understandable that in order to meet the voltage sampling range of the sampling module, the power supply module 20 can also output a preset voltage signal corresponding to the voltage setting signal according to the received voltage setting signal to meet the sampling requirements. It is understandable that the voltage setting signal can be given by the main control module or by an external terminal.

[0078] In addition, in combination with the above embodiments, in one embodiment of the present invention, reference is made to Figure 4 , the sampling module 30 also includes:

[0079] The buffer circuit 32 has an input end connected to the output end of the differential amplifier module 31 , and an output end of the buffer circuit 32 electrically connected to the main control module 40 .

[0080] In this embodiment, the buffer circuit 32 can be implemented by a buffer chip or a D flip-flop. The buffer circuit 32 is used to receive the voltage detection signal output by the differential amplifier module 31, and cache it before outputting it. In this way, the stability of the voltage detection signal output to the mutual control module can be guaranteed, and the voltage detection signal can be prevented from fluctuating, thereby effectively improving the sampling accuracy of the test device and the accuracy of detection.

[0081] In this embodiment, reference Figure 2 , the power supply module 20 includes:

[0082] A voltage source module 21, the voltage source module 21 is electrically connected to the access device 10, and applies a preset voltage signal to both ends of the signal line to be tested via the first connector 11 and the second connector 12;

[0083] The constant current source module 22 is electrically connected to the access device 10 and outputs a preset current signal to the signal line to be tested via the first connector 11 and the second connector 12 .

[0084] In the present embodiment, the voltage source module 21 can be implemented by using a power access terminal and a voltage conversion module, such as at least one of a rectifier circuit, a DCDC circuit, and an LLC transformer circuit. The power access terminal can be used to access the battery voltage, or to access the voltage provided by an external power supply, such as the mains power of the power grid or the voltage output by an outdoor power supply. Optionally, the voltage source module 21 can output a preset voltage signal of a preset voltage value corresponding to its specification type. Optionally, the voltage source module 21 is also used to output a preset voltage signal corresponding to the voltage setting signal when a voltage setting signal is received. Specifically, the voltage source module 21 can establish an electrical connection with the main control module 40, and the main control module 40 can output a corresponding voltage setting signal to the voltage source module 21 according to the voltage setting signal transmitted from the trigger module on the test device or the setting signal transmitted from the external terminal, so that the power supply module outputs the corresponding voltage, thereby meeting the detection voltage requirements of different signal lines to be tested, and meeting the voltage sampling range of the above-mentioned sampling module 30.

[0085] In the present embodiment, the current source module can be implemented by a constant current chip, or by a constant current circuit composed of a switch tube. It is understandable that the current source module can also be electrically connected to the main control module 40 to realize the current value of the preset current signal output by the current source module adjusted by the main control module 40, that is, the current value on the current signal line to be tested is the current value of the preset current signal. In this way, the main control module 40 can calculate the resistance of the area to be tested according to the voltage at both ends of the area to be tested and the current value of the preset current signal, and then judge whether the current signal line to be tested is abnormal according to the resistance of the area to be tested. At the same time, the output end of the voltage source module 21 is arranged in parallel with the output end of the constant current source module 22, that is, the output positive end of the two is electrically connected and electrically connected to the first connector 11, and the output negative end of the two is electrically connected and electrically connected to the second connector 12. It is understandable that such a setting can limit the current on the signal line to be tested to the preset current value, so as to prevent the situation that the line is burned by directly adding a preset voltage signal at both ends because the total resistance of the signal line to be tested is too low.

[0086] In one embodiment of the present invention, the reference electrical signal includes a preset current signal, and the main control module 40 is used to determine the voltage at both ends of the test area and the current flowing through the test area according to the preset current signal and the voltage detection signal, and calculate the resistance value of the test area;

[0087] When the resistance value is not within the preset resistance value range, the main control module 40 determines that the welding of the welding point on the signal line to be tested is abnormal;

[0088] When the resistance value is within the preset resistance value range, the main control module 40 determines that the welding of the welding point on the signal line to be tested is normal.

[0089] In this embodiment, the power supply module can be implemented by a constant current chip, or by sampling the constant current source and the voltage source in the above embodiment. It can be understood that if the welding of the welding point on the current signal line is abnormal, then the resistance value on the test area, such as the resistance value of the welding point or the resistance value of the signal line on the entire signal line must be abnormal. The R&D personnel can test at least one sample multiple times during the research and development period to confirm the preset resistance range of the test area on the signal line to be tested when the welding point of the signal line is normal. In the actual test, the circuit module can confirm whether the welding of the welding point on the current signal line to be tested is abnormal by comparing the relationship between the preset resistance range of the test area and the resistance value actually obtained through the above embodiment process.

[0090] Optionally, in another embodiment, the reference electrical signal includes a preset current signal; the preset current signal includes a first preset current signal and a second preset current signal; the voltage detection signal includes a first voltage detection signal and a second voltage detection signal;

[0091] The main control module 40 is used to control the power supply module 20 to output a first preset current signal and obtain a corresponding first voltage detection signal through the sampling module 30, and then control the power supply module 20 to output a second preset current signal and obtain a corresponding second voltage detection signal through the sampling module 30; and obtain the resistance value of the area to be tested according to a preset calculation formula;

[0092] When the resistance value is not within the preset resistance value range, the main control module 40 determines that the welding of the welding point on the signal line to be tested is abnormal;

[0093] When the resistance value on the signal line to be tested is within the preset resistance value range, the main control module 40 determines that the welding of the welding point on the signal line to be tested is normal;

[0094] The default calculation formula is:

[0095]

[0096] Among them, I2 is the second current determined by the main control module 40 according to the second preset current signal, I1 is the first current determined by the main control module 40 according to the first preset current signal, V2 is the second voltage determined by the main control module 40 according to the second voltage detection signal, and V1 is the first voltage determined by the main control module 40 according to the first voltage detection signal.

[0097] In this embodiment, the power supply module 20 can also be implemented by a constant current chip, or by sampling the constant current source and voltage source in the above embodiment. The main control module 40 can obtain the resistance value of the test area by measuring the resistance by the volt-ampere method. Compared with directly detecting the resistance value based on the preset current signal and voltage signal, it can further improve the accuracy of the resistance value detection, thereby improving the accuracy of the test device in detecting the welding state of the welding point of the signal line to be tested.

[0098] It is understandable that, since the present application determines the welding state of the welding point of the current signal line to be tested by detecting the resistance value of the test area on the signal line to be tested. The resistance value of the signal line to be tested is generally small, so in order to improve the accuracy of the detection, the test area can be set to the area between the two ends of the welding point, that is, Figure 1 A and B shown in FIG.

[0099] The test device of the present invention includes an access device 10, a power supply module 20, a sampling module 30 and a main control module 40; wherein the access device 10 has a first connector 11 and a second connector 12 for accessing the two ends of the signal line to be tested, and a first sampling component 13 and a second sampling component 14 for accessing the two ends of the test area on the signal line to be tested. The power supply module 20 is used to output a reference electrical signal to the signal line to be tested through the first connector 11 and the second connector 12, the sampling module 30 is used to collect the voltage at the two ends of the test area on the signal line to be tested through the first sampling component 13 and the second sampling component 14 and output a corresponding voltage detection signal, and the main control module 40 is used to determine the welding state of the welding point on the signal line to be tested according to the reference electrical signal and the voltage detection signal. Through the above settings, the test device can detect the DC resistance of the signal line correspondingly connected on the current flexible circuit and the circuit board, so as to realize the judgment of the welding state of the welding point of the current signal line, that is, to realize the judgment of the welding state of the gold finger of a certain signal line on the flexible circuit board and the pad corresponding to the signal line on the circuit board. Thus, in practical applications, the testing device of the present invention realizes the detection of the welding status of the welding points of the signal lines in the products with Hotbar process, so that the user can judge whether the current flexible circuit board and the circuit board have poor welding according to the results of the welding status detection, thereby effectively improving the production yield of the products with Hotbar process.

[0100] In one embodiment of the present invention, the first connecting member 11, the second connecting member 12, the first sampling member 13 and the second sampling member 14 form a detection end group, and the access device 10 has a plurality of detection end groups.

[0101] In this embodiment, optionally, corresponding to each detection terminal group, a plurality of power supply modules 20 and a plurality of sampling modules 30 may be provided correspondingly, and connected one by one. In other words, each detection terminal group may be used to access a signal line to be tested, and the main control module 40 may control the plurality of power supply modules 20 to simultaneously output reference electrical signals to the plurality of signal lines, and simultaneously obtain a plurality of voltage detection signals through the plurality of sampling modules 30, so as to realize the testing of the welding status of the welding points on the plurality of signal lines to be tested at the same time, thereby improving the efficiency of the test.

[0102] Optionally, in another embodiment, the number of the power supply module 20 and the sampling module 30 is still one, refer to Figure 5 , the access device 10 further includes a first switch module 15 and a second switch module 16;

[0103] The first switch module 15 is electrically connected to the first connector 11, the second connector 12, the power supply module 20 and the main control module 40 respectively;

[0104] The second switch module 16 is electrically connected to the first sampling component 13, the second sampling component 14, the power supply module 20 and the main control module 40 respectively;

[0105] The main control module 40 is used to control the first switch module 15 and the second switch module 16 to enable the power supply module 20 to be connected to both ends of the corresponding signal line to be tested, and to enable the sampling module 30 to be connected to both ends of the test area in the corresponding signal line to be tested.

[0106] In this embodiment, the first switch module 15 and the second switch module 16 can be composed of multiple switch devices, or can be implemented by a gate chip. The main control module 40 can determine which signal line to be tested that is connected to the detection end group that needs to be tested according to the currently received trigger signal, and control the first switch module 15 and the second switch module 16 to operate to test the signal line to be tested. Figure 5 , take the case where the detection end group 1 is connected to the signal line I to be tested, and the detection end group 2 is connected to the signal point II to be tested as an example, if the signal line I to be tested needs to be tested at present, the user can trigger the trigger module on the test device to make it output the corresponding trigger signal, or trigger the external terminal to make the external terminal output the corresponding trigger signal to the main control module 40. When the main control module 40 receives the trigger signal, and determines according to the trigger signal that the signal line I to be tested connected to the detection end group 1 needs to be tested at present, then the first switch module 15 will be controlled to operate to conduct the path between the power supply module 20 and the first connector 11 and the second electrical connector in the detection end group 1, that is, to conduct the path between the power supply module 20 and the connector 1 and the connector 2. Similarly, the main control module 40 will also control the second switch module 16 to operate to conduct the path between the sampling module 30 and the first sampling component 13 and the second sampling component 14 in the detection group 1, that is, to conduct the path between the sampling module 30 and the point A and the point B on the signal line I to be tested, and test the signal line I to be tested according to the above embodiment process.

[0107] It should be understood that the contents and Figure 7 As can be seen from the schematic diagram, a flexible circuit board is often provided with at least one signal line. When the flexible circuit board is welded to the circuit board through a hot pressing tin melting welding process, the flexible circuit board and the corresponding signal line on the circuit board will establish an electrical connection with each other through welding.

[0108] To this end, in order to be able to test all signal lines through a complete test device test process, in this embodiment, the main control module 40 is used to control the first switch module 15 and the second switch module 16 to operate when receiving sequential test signals, so that the power supply module 20 and the sampling module 30 are connected to each detection end group in turn; and based on the acquisition of multiple reference electrical signals and multiple voltage detection signals, the welding status of the welding points on the multiple signal lines to be tested is determined.

[0109] In this embodiment, when the main control module 40 receives a sequential test signal (which can be obtained from a trigger device or from a communication module via an external terminal), the detection end group that needs to be tested currently and the test order of the detection end group to be tested can be determined according to the sequential test signal. Figure 5 , the current detection end groups are detection end group 1 and detection end group 2, and the test sequence is from detection end group 1 to detection end group 2. After receiving the sequential test signal, the main control module 40 will confirm the detection end group and the detection sequence to be tested, and control the first switch module 15 and the second switch module 16 to act according to the same process in the above embodiment, so that the power supply module 20 and the sampling module 30 are connected to each detection end group, that is, the power supply module 20 and the sampling module 30 are electrically connected to each signal line to be tested. When testing each signal line to be tested, the main control module 40 can obtain the welding state of the welding point of the current signal line to be tested according to the test process in the above embodiment. And after obtaining the current welding state, according to the detection sequence, the first switch module 15 and the second switch module 16 are controlled to act again to test the next signal line to be tested until the welding states of all the above signals to be tested have been obtained and prompted.

[0110] Thus, through the above configuration, the test device of the present invention can realize the welding status of all signal lines on the flexible circuit board and the corresponding signal lines on the circuit board, thereby improving the efficiency of the test device. At the same time, the sequential testing method can effectively save the number of circuit modules set in the test device, simplify the volume of the test device, and improve the integration of the test device. For example, combined with Figure 3 It can be seen from the embodiment in that in this embodiment, by sequentially measuring, only one differential amplifier module 31, one constant current source module 22 and one voltage source module 21 can be provided, without additionally providing repeated circuit modules.

[0111] It should be understood that in addition to being able to test the welding status of signal lines connected by hot-pressed tin-melting welding, the testing device of the present invention can also detect whether the voltage-stabilizing device in the current product to be tested is damaged, for example, whether the TVS tube in the product to be tested is damaged.

[0112] Specifically, in one embodiment of the present invention, referring to Figure 6When receiving the voltage stabilizer device test signal, the main control module 40 first controls the power supply module 20 to output a first reference current signal to flow from the first end of the voltage stabilizer device to be tested to the second end of the voltage stabilizer device to be tested and controls the sampling module 30 to collect the forward voltage at both ends of the voltage stabilizer device to be tested through the first sampling device 13 and the second sampling device 14, and then controls the power supply module 20 to output a second reference current signal to flow from the first end of the voltage stabilizer device to be tested to the second end of the voltage stabilizer device to be tested and controls the sampling module 30 to collect the reverse voltage at both ends of the voltage stabilizer device to be tested through the first sampling device 13 and the second sampling device 14; and determines the state of the voltage stabilizer on the signal line to be tested according to the forward voltage and the reverse voltage.

[0113] In this embodiment, the first connector 11 and the second connector 12 can be implemented by the connectors in the above embodiment, the first connector 11 can be used to access the VBUS connector electrically connected to the first end of the voltage stabilizer, and the second connector 12 can be used to access the GND connector electrically connected to the second end of the voltage stabilizer. When the active module receives the voltage stabilizer test signal transmitted when the trigger module on the test device is triggered, or receives the voltage stabilizer test signal transmitted from the external terminal via the communication module, it will start to perform the forward voltage and reverse voltage test of the above voltage stabilizer.

[0114] It is understandable that the current values ​​of the first reference current signal and the second reference current signal can be the same, for example, 1mA, and the directions of the first reference current signal and the second reference current signal are different. Optionally, the main control module 40 can control the power supply module 20 to output a forward current or a reverse current to achieve the above-mentioned acquisition of the forward voltage and the reverse voltage. Optionally, the access device 10 can also be provided with a fourth switch module (not shown in the figure), and the fourth switch module is electrically connected to the positive and negative output terminals of the power supply module 20, the first connector 11 and the second connector 12 respectively. When the main control module 40 needs to confirm the forward voltage of the current voltage stabilizer, the fourth switch module can be controlled to operate to conduct the path between the positive output terminal of the power supply module 20 and the first connector 11, and conduct the path between the negative output terminal of the power supply module 20 and the second connector 12, and control the power supply module 20 to output a reference current of a preset current value, that is, a first reference current signal. At this time, the reference current will flow from the first end of the voltage stabilizer to the second end of the voltage stabilizer. When the main control module 40 needs to confirm the reverse voltage of the current voltage stabilizer, the second switch module 16 is also controlled to operate to conduct the path between the positive output terminal of the power supply module 20 and the second connector 12, and the path between the negative output terminal of the power supply module 20 and the first connector 11, and control the power supply module 20 to output a reference current of a preset current value, that is, a second reference current. At this time, the reference current will flow from the second end of the voltage stabilizer to the first end of the voltage stabilizer.

[0115] Optionally, the sampling module 30 may be an analog-to-digital conversion module, and the main control module 40 may obtain the first voltage signal collected by the first sampling component 13 and the second voltage signal collected by the second sampling component 14 through the analog-to-digital conversion module. When the control power supply module 20 outputs the first reference current signal, the main control module 40 may subtract the second voltage signal from the first voltage signal to obtain the forward voltage. When the control power supply module 20 outputs the second reference current signal, the main control module 40 may subtract the first voltage signal from the second voltage signal to obtain the reverse voltage.

[0116] Optionally, the sampling module 30 may also be the differential amplifier module 31 in the above embodiment. In this case, the access device 10 may further include a third switch module 17. Figure 6 and Figure 3 When the power supply module 20 is controlled to output the first reference current signal, the main control module 40 can control the third switch module 17 to operate, so as to conduct the path between the positive phase input terminal of the differential amplifier module 31 and the first end of the voltage stabilizer, and conduct the path between the negative phase input terminal of the differential amplifier module 31 and the second end of the voltage stabilizer. At this time, the voltage detection signal output by the sampling module 30 represents the forward voltage on the voltage stabilizer. When the power supply module 20 is controlled to output the second reference current signal, the main control module 40 can control the third switch module 17 to operate, so as to conduct the path between the positive phase input terminal of the differential amplifier module 31 and the second end of the voltage stabilizer, and conduct the path between the negative phase input terminal of the differential amplifier module 31 and the first end of the voltage stabilizer. At this time, the voltage detection signal output by the sampling module 30 represents the reverse voltage on the voltage stabilizer.

[0117] Thus, through the above-mentioned setting, the testing device of the present invention can also realize the testing of the forward voltage and reverse voltage of the voltage stabilizing device, and prompt the result to the user so that the user can confirm whether the current voltage stabilizing device is abnormal, thereby effectively improving the versatility of the testing device of the present invention.

[0118] In one embodiment of the present invention, the testing device further includes:

[0119] The prompt module is electrically connected to the main control module 40; the main control module 40 is also used to control the prompt module to prompt the welding status.

[0120] In this embodiment, the prompt module can be implemented by a display module, such as an LED lamp, a display screen, a digital tube, etc., or a voice prompt module, such as a speaker. Specifically, taking the display module as a display screen as an example, the main control module 40 can control the display screen to display the welding state of the welding point for hot pressing tin melting welding obtained through the above-mentioned embodiments. For example, only the welding state of one signal line is currently detected, and the detection result is that the welding is normal, then the main control module 40 will control the display screen to display the image of "signal line 1 welding is normal" to prompt the user of the welding state of the signal line currently under test. In addition, it can be understood that the main control module 40 can also control the prompt module to prompt the resistance value of the area to be tested on the current signal line, so that when the welding state of the signal line is abnormal, the user can analyze the cause of the abnormal welding according to the resistance value of the area to be tested. In this way, through the above-mentioned setting, the test device can directly prompt the user after the welding state detection of the welding point is completed, which improves the convenience of the user using the test device.

[0121] The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A testing device, characterized in that: The testing device comprises: An access device, the access device having a first connector and a second connector for accessing two ends of a signal line to be tested; and a first sampling member and a second sampling member for accessing two ends of a test area on the signal line to be tested; A power supply module, the power supply module is electrically connected to the access device and is used to output a reference electrical signal to the signal line to be tested via the first connector and the second connector; A sampling module, the sampling module is electrically connected to the access device and is used to collect the voltage at both ends of the test area on the test signal line through the first sampling device and the second sampling device, and output a corresponding voltage detection signal; The main control module is used to determine the welding state of the welding point on the signal line to be tested according to the reference electrical signal and the voltage detection signal.

2. The testing device according to claim 1, characterized in that: The power supply module comprises: A voltage source module, the voltage source module is electrically connected to the access device and applies a preset voltage signal to both ends of the signal line to be tested via the first connector and the second connector; A constant current source module is electrically connected to the access device and outputs a preset current signal to the signal line to be tested via the first connector and the second connector.

3. The testing device according to claim 1, characterized in that: The reference electrical signal includes a preset current signal; The main control module is used to determine the voltage at both ends of the area to be tested and the current flowing through the area to be tested according to the preset current signal and the voltage detection signal, and calculate the resistance value of the area to be tested; When the resistance value of the resistor is not within the preset resistance value range, the main control module determines that the welding of the welding point on the signal line to be tested is abnormal; When the resistance value of the resistor is within the preset resistance value range, the main control module determines that the welding of the welding point on the signal line to be tested is normal.

4. The testing device according to claim 1, characterized in that: The reference electrical signal includes a preset current signal; the preset current signal includes a first preset current signal and a second preset current signal; the voltage detection signal includes a first voltage detection signal and a second voltage detection signal; The main control module is used to control the power supply module to output the first preset current signal and obtain the corresponding first voltage detection signal through the sampling module, and then control the power supply module to output the second preset current signal and obtain the corresponding second voltage detection signal through the sampling module; and obtain the resistance value of the area to be tested according to a preset calculation formula; When the resistance value of the resistor is not within the preset resistance value range, the main control module determines that the welding of the welding point on the signal line to be tested is abnormal; When the resistance value on the signal line to be tested is within the preset resistance value range, the main control module determines that the welding of the welding point on the signal line to be tested is normal; The default calculation formula is: Among them, I2 is the second current determined by the main control module according to the second preset current signal, I1 is the first current determined by the main control module according to the first preset current signal, V2 is the second voltage determined by the main control module according to the second voltage detection signal, and V1 is the first voltage determined by the main control module according to the first voltage detection signal.

5. The testing device according to claim 1, characterized in that: The power supply module is further configured to output a preset voltage signal corresponding to the voltage setting signal when receiving the voltage setting signal.

6. The testing device according to claim 1, characterized in that: The sampling module comprises: A differential amplifier module, wherein a first input end of the differential amplifier module is electrically connected to the first sampling component, and a second output end of the differential amplifier module is electrically connected to the second sampling component; The differential amplifier module is used to perform a differential amplification on the first voltage collected at one end of the test area by the first sampling device and the second voltage collected at the other end of the test area by the second sampling device, and then output a corresponding voltage detection signal after amplifying the difference according to a preset amplification factor.

7. The testing device according to claim 6, characterized in that: The sampling module also includes: A buffer circuit, wherein the input end of the buffer circuit is connected to the output end of the differential amplifier module, and the output end of the buffer circuit is electrically connected to the main control module.

8. The testing device according to claim 6, characterized in that: The differential amplifier module also has an amplification factor setting terminal, and the sampling module also includes a variable resistance module; The variable resistor module is electrically connected to the amplification factor setting terminal of the differential amplifier module, and is used to set its own resistance value according to the received trigger signal, or to adjust its own resistance value accordingly when triggered by the user; The differential amplifier module is used to set its own preset amplification factor according to the resistance value of the variable resistor module.

9. The testing device according to any one of claims 1 to 8, characterized in that: The first connecting member, the second connecting member, the first sampling member and the second sampling member form a detection end group, and the access device has a plurality of the detection end groups.

10. The testing device according to claim 9, characterized in that: The access device further includes a first switch module and a second switch module; The first switch module is electrically connected to the first connecting member, the second connecting member, the power supply module and the main control module respectively; The second switch module is electrically connected to the first sampling component, the second sampling component, the power supply module and the main control module respectively; The main control module is used to control the actions of the first switch module and the second switch module so that the power supply module is connected to the two ends of the corresponding signal line to be tested, and the sampling module is connected to the two ends of the test area in the corresponding signal line to be tested.

11. The testing device according to claim 10, characterized in that: The main control module is used to control the first switch module and the second switch module to operate when receiving test signals in sequence, so that the power supply module and the sampling module are connected to each detection end group in sequence; and determine the welding status of the welding points on the multiple signal lines to be tested based on the multiple reference electrical signals and the multiple voltage detection signals obtained.

12. The testing device according to any one of claims 1 to 8, characterized in that: When receiving the voltage stabilizing device test signal, the main control module first controls the power supply module to output a first reference current signal flowing from the first end of the voltage stabilizing device to be tested to the second end of the voltage stabilizing device to be tested and controls the sampling module to collect the forward voltage at both ends of the voltage stabilizing device to be tested through the first sampling device and the second sampling device, and then controls the power supply module to output a second reference current signal flowing from the first end of the voltage stabilizing device to be tested to the second end of the voltage stabilizing device to be tested and controls the sampling module to collect the reverse voltage at both ends of the voltage stabilizing device to be tested through the first sampling device and the second sampling device; And according to the forward voltage and the reverse voltage, the state of the voltage stabilizing device on the signal line to be tested is determined.

13. The testing device according to any one of claims 1 to 8, characterized in that: The testing device also includes: A prompt module is electrically connected to the main control module; the main control module is also used to control the prompt module to prompt the welding status.

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