CN113419159B - Testing method, testing device and testing circuit of flexible circuit board - Google Patents
Testing method, testing device and testing circuit of flexible circuit board Download PDFInfo
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- CN113419159B CN113419159B CN202110604320.8A CN202110604320A CN113419159B CN 113419159 B CN113419159 B CN 113419159B CN 202110604320 A CN202110604320 A CN 202110604320A CN 113419159 B CN113419159 B CN 113419159B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2825—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere in household appliances or professional audio/video equipment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2843—In-circuit-testing
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Abstract
The invention discloses a flexible circuit board testing method, which comprises the following steps: when a preset electronic element is connected with a flexible circuit board to form a module to be tested, inputting constant current to the module to be tested and detecting the total voltage of the module to be tested; determining electrical performance parameters of the flexible circuit board according to the total voltage and a preset voltage; the preset voltage is preset voltage when the preset electronic element inputs the constant current; and determining the test result of the flexible circuit board according to the comparison result of the electrical property parameter and the target electrical property parameter. The invention also discloses a flexible circuit board testing device and a flexible circuit board testing circuit. The invention aims to realize effective detection of the circuit connection condition of the flexible circuit board and improve the accuracy of the detection result of the flexible circuit board.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a testing method and a testing device for a flexible circuit board and a testing circuit for the flexible circuit board.
Background
In electronic products (e.g., projection devices), flexible Printed Circuit (FPC) is widely used as the miniaturization and precision of the products are more and more required.
At present, the flexible circuit board is generally subjected to visual inspection or automatic optical detection, and the circuit connection condition of the flexible circuit board cannot be effectively detected by the modes, so that the accuracy of the detection result of the flexible circuit board is influenced.
Disclosure of Invention
The invention mainly aims to provide a testing method of a flexible circuit board, a testing device of the flexible circuit board and a testing circuit of the flexible circuit board, aiming at realizing effective detection of the circuit connection condition of the flexible circuit board and improving the accuracy of the detection result of the flexible circuit board.
In order to achieve the above object, the present invention provides a method for testing a flexible circuit board, the method comprising the steps of:
when a preset electronic element is connected with a flexible circuit board to form a module to be tested, inputting a constant current to the module to be tested and detecting the total voltage of the module to be tested;
determining electrical performance parameters of the flexible circuit board according to the total voltage and a preset voltage; the preset voltage is preset voltage when the preset electronic element inputs the constant current;
and determining the test result of the flexible circuit board according to the comparison result of the electrical property parameter and the target electrical property parameter.
Optionally, the step of determining the electrical performance parameter of the flexible circuit board according to the total voltage and a preset voltage includes:
determining the test voltage of the flexible circuit board according to the total voltage and the preset voltage;
determining the test resistance of the flexible circuit board according to the test voltage;
determining the test resistance as the electrical property parameter.
Optionally, the step of determining the test resistance of the flexible circuit board according to the test voltage includes:
obtaining a preset corresponding relation between the test voltage and the test resistor according to the constant current;
and determining the test resistance corresponding to the test voltage based on the preset corresponding relation.
Optionally, the flexible circuit board is provided with a plurality of signal lines, and before the step of inputting a constant current to the module to be tested and detecting a total voltage of the module to be tested, the method further includes:
determining a target signal line in the signal lines when a preset electronic element and a flexible circuit board are connected based on a matched interface to form a module to be tested;
determining a target control signal corresponding to the target signal line;
and inputting the target control signal to a change-over switch, and when receiving the target control signal, the change-over switch accesses the target signal line to a test loop formed by connecting the module to be tested and a constant current power supply, wherein the constant current power supply is a power supply module for inputting the constant current.
Optionally, the step of determining a target signal line of the plurality of signal lines includes:
and taking each signal line as the target signal line in turn.
Optionally, the target electrical performance parameter includes a target electrical performance parameter interval, and the step of determining the test result of the flexible circuit board according to the comparison result of the electrical performance parameter and the target electrical performance parameter includes:
if the comparison result is that the target electrical performance parameter is within the target electrical performance parameter interval, determining that the test result is that the flexible circuit board is normal;
and if the comparison result is that the target electrical performance parameter is positioned outside the target electrical performance parameter interval, determining that the test result is that the flexible circuit board is abnormal.
Optionally, the flexible circuit board is a flexible circuit board applied to a projection device, the preset electronic component is a digital micromirror device used in the projection device and connected with the flexible circuit board in a matched manner, a diode is arranged in the digital micromirror device, and the preset voltage is a voltage drop when the diode is conducted through the constant current.
In addition, in order to achieve the above object, the present application also provides a flexible circuit board testing apparatus, including:
the preset electronic element is provided with a third interface, and the third interface is used for being connected with the interface of the flexible circuit board in a matching manner;
the constant current power supply is used for outputting constant current;
the voltage testing module is used for detecting voltage;
the controller, the constant current power supply with the voltage test module all with the controller is connected, the controller includes: the flexible circuit board testing method comprises a memory, a processor and a flexible circuit board testing program which is stored on the memory and can run on the processor, wherein the steps of the flexible circuit board testing method are realized when the flexible circuit board testing program is executed by the processor.
Optionally, the flexible circuit board is a flexible circuit board applied to a projection device, the preset electronic component is a digital micromirror device in the projection device, the digital micromirror device is used for being connected with the flexible circuit board in a matched manner, a diode is arranged in the digital micromirror device, and the preset voltage is a voltage drop when the diode is conducted through the constant current; and/or the presence of a gas in the atmosphere,
the flexible circuit board is provided with a plurality of signal wires, the flexible circuit board testing device further comprises a change-over switch, the change-over switch is used for switching different signal wires to be connected into a testing loop formed by connecting the preset electronic element and the flexible circuit board with the constant current power supply, and the change-over switch is connected with the controller.
In addition, in order to achieve the above object, the present application also provides a flexible circuit board test circuit, including:
the flexible circuit board testing device as above; and
a flexible circuit board having a fourth interface that mates with the third interface;
wherein the third interface is connected with the fourth interface; the module formed by the preset electronic element and the flexible circuit board is defined as a module to be tested, the output end of the constant current power supply is connected with the input end of the module to be tested, the output end of the module to be tested is connected with the input end of the constant current power supply, and the voltage testing module is used for testing the total voltage of the module to be tested.
The invention provides a flexible circuit board testing method, which is characterized in that when a preset electronic element is connected with a flexible circuit board to form a module to be tested, a constant circuit is input into the module to be tested, the total voltage of the module to be tested is detected, the electrical property parameter of the flexible circuit board is determined based on the total voltage of the module to be tested and the preset voltage when the constant current is input into the preset electronic element, the testing result of the flexible circuit board is determined by the comparison result between the obtained electrical property parameter and the target electrical property parameter, and the obtained testing result is tested under the condition that the flexible circuit board is electrified, so that the obtained testing result can accurately reflect the circuit connection condition of the flexible circuit board, and the testing accuracy of the flexible circuit board is effectively improved.
Drawings
FIG. 1 is a schematic diagram of a hardware structure involved in the operation of an embodiment of the flexible circuit board testing device of the present invention;
FIG. 2 is a schematic structural diagram of a flexible circuit board testing circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an internal structure of a predetermined electronic component in an embodiment of a flexible printed circuit board testing circuit according to the present invention;
FIG. 4 is a schematic diagram illustrating the testing principle of the testing circuit in FIG. 2;
FIG. 5 is a schematic diagram of a switch according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating a flexible printed circuit testing method according to an embodiment of the present invention;
FIG. 7 is a schematic flowchart illustrating a method for testing a flexible printed circuit board according to another embodiment of the present invention;
fig. 8 is a schematic flow chart of a flexible circuit board testing method according to another embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: when a preset electronic element is connected with a flexible circuit board to form a module to be tested, inputting constant current to the module to be tested, and detecting the total voltage of the module to be tested; determining electrical performance parameters of the flexible circuit board according to the total voltage and a preset voltage; the preset voltage is preset voltage when the preset electronic element inputs the constant current; and determining the test result of the flexible circuit board according to the comparison result of the electrical property parameter and the target electrical property parameter.
In the prior art, the flexible circuit board is generally subjected to visual inspection or automatic optical detection, and the circuit connection condition of the flexible circuit board cannot be effectively detected by the methods, so that the accuracy of the detection result of the flexible circuit board is influenced.
The invention provides the solution, and aims to realize effective detection of the circuit connection condition of the flexible circuit board and improve the accuracy of the detection result of the flexible circuit board.
The embodiment of the invention provides a flexible circuit board test circuit, which is particularly used for testing the circuit connection condition of a flexible circuit board 1.
Specifically, in the present embodiment, referring to fig. 1 and 2, the flexible circuit board test circuit includes a flexible circuit board test device and a flexible circuit board 1 (FPC). The flexible circuit board testing device comprises a preset electronic element 21, a constant current power supply 22, a voltage testing module 23 and a controller 24.
The preset electronic component 21 is specifically an electronic component having an interface matching the interface of the flexible circuit board 1. Specifically, the preset electronic element 21 is an electronic element which is matched and connected with the flexible circuit board 1 in target equipment corresponding to the flexible circuit board 1, and the target equipment is equipment which needs to apply the flexible circuit board 1, so that on one hand, the matching and connecting conditions of the flexible circuit board 1 and other elements in the equipment which needs to be used can be tested while the circuit connection condition of the flexible circuit board 1 is tested; on the other hand, a needle bed required by the detection of the flexible circuit board 1 does not need to be additionally customized, so that the detection cost is saved and the detection efficiency is improved.
Specifically, in this embodiment, the flexible circuit board 1 is a flexible circuit board 1 applied to a projection device, the preset electronic component 21 is a Digital Micromirror Device (DMD) used in the projection device and connected to the flexible circuit board 1 in a matching manner, and a diode is built in the DMD. Referring to fig. 3, fig. 3 is an internal circuit diagram of a DMD as the predetermined electronic element 21, wherein 01 denotes a DMD signal connection pin, 02 denotes a built-in diode, and 03 denotes a GND (ground) common terminal of the DMD and the FPC.
Further, in order to ensure the accuracy of the test result of the flexible circuit board, the preset electronic element 21 has a fixed voltage when a constant current is input, and specifically, the preset voltage is defined as a preset voltage when the constant current is input to the preset electronic element 21. For example, the predetermined voltage is a voltage drop when the diode 02 is turned on. Specifically, since the built-in diode of the DMD generates a voltage drop of 0.45 when conducting in the forward direction, a voltage drop of 0.45 is generated in the circuit at this stage when the GND applies a forward current to the signal pin.
The preset electronic component 21 has a third interface 11, and the third interface 11 is used for matching and connecting with an interface of the flexible circuit board 1. Specifically, the flexible circuit board 1 has a fourth interface 2a matched with the third interface 11, and the third interface 11 is connected with the fourth interface 2a, so as to realize matching connection between the preset electronic component 21 and the flexible circuit board 1. The flexible circuit board 1 and the predetermined electronic component 21 may be connected in series or in parallel according to actual use requirements (for example, the flexible circuit board 1 is connected to other electronic components in the corresponding target device).
The constant current source 22 is specifically configured to output a constant current. Therefore, a module formed by the preset electronic element 21 and the flexible circuit board 1 is defined as a module to be tested, the output end of the constant current power supply 22 is connected with the input end of the module to be tested, and the output end of the module to be tested is connected with the input end of the constant current power supply 22. Based on this, the constant current source 22 may input a constant current to the detection module when testing the flexible circuit board 1.
The voltage testing module 23 is used for detecting voltage, and the setting position thereof can be selected according to actual testing requirements. In this embodiment, the voltage testing module 23 is used for testing the total voltage of the module under test. Specifically, the voltage testing module 23 may be disposed at two ends of the constant current source 22, or disposed at a signal output end of the flexible circuit board 1 and an input end of the predetermined electronic element 21 when the flexible circuit board 1 is connected in series with the predetermined electronic element 21, respectively.
In an embodiment of the present invention, referring to fig. 1, the controller 24 includes: a processor 1001 (e.g., CPU), a memory 1002, a data interface 1003, a signal interface 1004, and the like. The memory 1002 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 1002 may alternatively be a storage device separate from the processor 1001.
The constant current power supply 22, the voltage test module 23, and the like are connected to the controller 24. The data interface 1003 is connected to the voltage testing module 23 and can be used to obtain data detected by the voltage testing module 23. The signal interface 1004 is connected to the constant current power supply 22 and can be used to control the output operation of the constant current power supply 22.
In this embodiment, in order to improve the refinement of the testing apparatus, the controller 24 includes a single chip microcomputer and a central control system connected to the single chip microcomputer, the voltage testing module 23 may specifically be an ADC pin of the single chip microcomputer, and the single chip microcomputer is in communication connection (for example, USB connection) with the central control system, based on which the single chip microcomputer can transmit the received voltage data back to the central control system, so that the central control system determines the electrical performance parameter (for example, resistance value) of the flexible circuit board 1 according to the received voltage data.
Those skilled in the art will appreciate that the configuration of the device shown in fig. 1 is not intended to be limiting of the device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a flexible circuit board test program may be included in the memory 1002, which is a kind of computer-readable storage medium. In the apparatus shown in fig. 1, the processor 1001 may be configured to call a flexible circuit board test program stored in the memory 1002 and perform operations of steps related to the flexible circuit board test method in the following embodiments.
Based on the above components, in the present embodiment, referring to fig. 2, the flexible circuit board 1 is provided with a fifth interface 213, a sixth interface 214, a first interface 211, and a second interface 212. The first interface 211 and the second interface 212 are signal interfaces of the flexible circuit board 1, and the flexible circuit board 1 is connected to the first interface 211 and the second interface 212 through signal lines. The fifth interface 213 and the sixth interface 214 are specifically the wire Ground (GND) of the flexible circuit board 1, and the fifth interface 213 and the sixth interface 214 are connected by a wire with a small resistance (smaller than a set threshold). Based on this, the fourth interface 2a may include the second interface 212 and the sixth interface 214, the preset electronic component 21 may be provided with the third interface 11 matched with the second interface 212 and the sixth interface 214, when the second interface 212 and the sixth interface 214 of the flexible circuit board 1 are connected with the corresponding matched third interface 11 in the preset electronic component 21, the flexible circuit board 1 and the preset electronic component 21 form a module to be tested, the fifth interface 213 is an input end of the module to be tested, and the first interface 211 is an output end of the module to be tested. Based on this, the output end of the constant current power supply 22 is connected with the fifth interface 213, the fifth interface 213 and the sixth interface 214 are connected based on the electric wire inside the flexible circuit board 1, the sixth interface 214 is connected with the corresponding third interface 11 in the preset electronic element 21, the second interface 212 is connected with the corresponding second interface 212 in the preset electronic element 21, and the first interface 211 is connected with the input end of the constant current power supply 22, so as to form a closed loop for detecting the flexible circuit board 1. The voltage detection module can be arranged between the constant current power supply 22 and the fifth interface 213 or the sixth interface 214 and the corresponding third interface 11, and is used for detecting the first voltage value at the position; the voltage detection module can also be arranged between the constant current power supply 22 and the first interface 211 and is used for detecting a second voltage value at the position; the total voltage of the module under test (i.e., the total output voltage of the constant current power supply 22) is determined based on the voltage difference between the first voltage value and the second voltage value.
Based on the closed loop, the constant current source 22 may input a constant current to a module to be tested formed by connecting the flexible circuit board 1 and the preset electronic element 21, detect a total voltage of the module to be tested through the voltage detection module in a process of inputting the constant current, determine an actual electrical property parameter of the flexible circuit board 1 according to the detected total voltage and a preset voltage corresponding to the preset electronic element 21, and determine a test result of the flexible circuit board 1 based on a comparison structure of the actually determined electrical property parameter of the flexible circuit board 1 and a target electrical property parameter. The target electrical property parameter is specifically a target value that the electrical property parameter needs to reach when the inside of the flexible circuit board 1 meets a preset use requirement (for example, each signal line in the flexible circuit board 1 is normally connected).
Further, for more clearly explaining the detection principle of the test circuit of the present application, referring to fig. 4, fig. 4 is a simplified circuit diagram of fig. 2, two ends of the R-FPC are respectively two signal interfaces of the FPC, the D-DMD is a diode built in a DMD component, and the voltage drop is 0.45V (abbreviated as Ud), based on which, the constant current power supply 22 outputs a stable 10mA current to power the test circuit, the probe is arranged at U0 to detect the positive voltage under the constant current path, and the probe is arranged at U1 to detect the negative voltage under the constant current path, based on which, the actual signal resistance value of the FPC is R-FPC = (U0-U1-Ud)/10 mA, and the obtained R-FPC can be used as the actual electrical performance parameter of the flexible circuit board 1.
In this embodiment, the test circuit of the flexible circuit board 1 is set according to the above manner, so that it is ensured that the obtained test result is tested under the condition that the flexible circuit board 1 is powered on, and it is ensured that the obtained test result can accurately reflect the circuit connection condition of the flexible circuit board 1, thereby effectively improving the test accuracy of the flexible circuit board.
Further, in an embodiment, the flexible circuit board 1 is provided with a plurality of signal lines, each of the signal lines has a first interface 211 and a second interface 212, the plurality of first interfaces 211 are connected to the constant current power supply 22 for inputting the constant current, and the plurality of second interfaces 212 are connected to the predetermined electronic component 21 in a matching manner. The first interface 211 and the second interface 212 here are the same concept as the first interface 211 and the second interface 212 in the above-described embodiment.
Based on this, referring to fig. 5, the flexible circuit board testing apparatus further includes a change-over switch 3, the change-over switch 3 is configured to switch different signal lines to be connected between the constant current power supply 22 and the preset electronic component 21, and the change-over switch 3 is connected to the controller 24. Specifically, the signal interface 1004 of the controller 24 is connected to the change-over switch 3, so as to control the change-over switch 3 to connect different signal lines to the closed loop formed by connecting the constant current power supply 22 and the module to be tested by outputting different signals.
Specifically, in the present embodiment, the flexible circuit board 1 includes 8 signal lines, and based on the total number of the signal lines of the flexible circuit board 1, the number of the signal interfaces 1004 of the controller 24 is at least three (U11, U2B, U C), and the three signal interfaces are in communication connection with the control terminal of the change-over switch 3. Based on this, the controller 24 can control the high-low level state of the three signal interfaces, the controller 24 can output 8 different control signals through the three signal interfaces, each control signal corresponds to a signal line, and the change-over switch 3 can access the corresponding signal line to the test loop based on the received control signal, so that the determination of the electrical performance parameters of the signal line in the flexible circuit board 1 can be realized, and the corresponding test result can be obtained. In addition, the controller 24 may further include a switch interface (e.g., INH1 interface) electrically connected to the control terminal of the transfer switch 3, based on which the controller 24 may turn on or off the transfer switch 3 by inputting or prohibiting inputting of an electrical signal through the switch interface.
In this embodiment, by setting the change-over switch 3, the circuit connection condition of each signal line in the flexible circuit board 1 can be detected separately, so that the accuracy of the detection result of the flexible circuit board 1 is further improved.
Further, based on the test circuit, the embodiment of the invention also provides a flexible circuit board control device. The detailed structure, the working principle and the technical effects achieved by the flexible circuit board testing device can refer to the related description in the above testing circuit embodiment, and are not described herein again.
The embodiment of the invention also provides a flexible circuit board testing method, which is based on the flexible circuit board testing circuit to test the circuit connection condition of the flexible circuit board.
Referring to fig. 6, an embodiment of a flexible circuit board testing method according to the present application is provided. In this embodiment, the flexible circuit board testing method includes:
step S10, inputting constant current to a module to be detected and detecting the total voltage of the module to be detected when a preset electronic element is connected with a flexible circuit board to form the module to be detected;
specifically, when the preset electronic element and the flexible circuit board are connected in series or in parallel based on the matched interface, the module formed by connecting the two components is used as the module to be tested.
The connection between the preset electronic element and the flexible circuit board can be controlled manually or controlled by an automatic electric control device. When the preset electronic element is connected with the flexible circuit board to form the module to be tested, the flexible circuit board is considered to be connected with the flexible circuit board testing device and form a testing loop, the preset instruction can be input by a detection person or automatically generated by the device, and the preset electronic element is determined to be connected with the flexible circuit board to form the module to be tested when the preset instruction is detected.
When the preset electronic element is determined to be connected with the flexible circuit board to form the module to be tested, the constant current power supply is controlled to input constant current to the module to be tested, and the total voltage of the module to be tested is detected in the process. Specifically, when the test circuit only includes a module to be tested in addition to the constant current power supply, the voltage at both ends of the constant current power supply can be detected as the total voltage. In the present embodiment, based on the test circuit shown in fig. 3, a first voltage value (voltage to ground) U0 between the sixth interface of the flexible circuit board and the third interface of the preset electronic component corresponding thereto is detected, a second voltage value (voltage to ground) U1 between the input terminal of the constant current power supply and the fifth interface of the flexible circuit board is detected, and then the total voltage = U0-U1 here.
The constant current can be set according to the test requirement, and can also be set based on the performance parameters of the preset electronic element. For example, when the predetermined electronic component includes a built-in diode, the rated forward current of the diode may be set as the constant current.
Step S20, determining electrical performance parameters of the flexible circuit board according to the total voltage and a preset voltage; the preset voltage is preset voltage when the preset electronic element inputs the constant current;
the preset voltage can be obtained by testing after constant current is led into the preset electronic element in advance; the predetermined voltage may also be determined by a performance parameter of the predetermined electronic component (e.g., a voltage drop between the two poles when the diode passes a nominal forward current). The preset voltage is stored in a setting area of the memory in advance. Based on this, the preset voltage here can be obtained by reading the parameters in the set area of the memory.
The electrical property parameters are characteristic parameters representing the connection performance of the flexible circuit board when the flexible circuit board is electrified. Specifically, the electrical performance parameters include voltage, resistance, electrical power, etc. of the flexible circuit board.
Based on the constant current input by the module to be tested, different total voltages and different preset voltages can correspond to different electrical performance parameters. For example, when the flexible circuit board and the preset electronic element are connected in series at two ends of the constant current power supply, the voltage difference between the total voltage and the preset voltage can be used as an electrical property parameter, and the voltage difference represents the actual voltage when the flexible circuit board is connected with the constant current; the corresponding resistance value of the flexible circuit board can be obtained based on the voltage difference and used as an electrical property parameter, wherein the resistance value represents the actual resistance of the flexible circuit board when constant current is introduced; the product of the voltage difference and the constant current can be used as an electrical property parameter, wherein the product represents the actual power of the flexible circuit board when the constant current is applied.
And S30, determining a test result of the flexible circuit board according to the comparison result of the electrical property parameters and the target electrical property parameters.
The target electrical property parameter is specifically a target value or a target range which is required to be reached by the electrical property parameter of the flexible circuit board when the module to be tested is connected with constant current. The target electrical performance parameters may be specifically parameters pre-configured and stored by the system, or may be parameters input by a tester based on actual test requirements. In the embodiment, the target electrical performance parameter is an electrical performance parameter representing normal connection inside the flexible circuit board; in other embodiments, the target electrical performance parameter may also be indicative of an electrical performance parameter at an abnormal connection within the flexible circuit board.
When the target electrical property parameter is a specific value, the comparison result specifically includes that the electrical property parameter is larger than the target electrical property parameter, and the electrical property parameter is smaller than the target electrical property parameter. When the target electrical property parameter is within a certain interval, the comparison result specifically includes that the electrical property parameter is within the target electrical property parameter interval, the electrical property parameter is outside the target electrical property parameter interval, and the like. Different comparison results represent test results of different flexible circuit boards.
Specifically, in this embodiment, the target electrical performance parameter includes a target electrical performance parameter interval, and the step of determining the test result of the flexible circuit board according to the comparison result between the electrical performance parameter and the target electrical performance parameter includes: if the comparison result is that the target electrical performance parameter is within the target electrical performance parameter interval, determining that the test result is that the flexible circuit board is normal; and if the comparison result is that the target electrical performance parameter is outside the target electrical performance parameter interval, determining that the test result is that the flexible circuit board is abnormal. For example, the resistance value of the flexible circuit board is greater than or equal to the set threshold value when the interior of the flexible circuit board is normal and in a connection state with a preset electronic element, and based on the resistance value set greater than or equal to the set threshold value, the resistance value set is used as the target electrical property parameter interval. When the actual resistance value of the flexible circuit board determined based on the total voltage and the preset voltage is larger than or equal to the set threshold value, the flexible circuit board is considered to be normal; when the actual resistance value of the flexible circuit board determined based on the total voltage and the preset voltage is smaller than the set threshold value, the flexible circuit board is considered to be abnormal, and faults such as signal line corrosion and poor contact may exist.
The method for testing the flexible circuit board comprises the steps of inputting a constant circuit to the module to be tested and detecting the total voltage of the module to be tested at the same time when a preset electronic element is connected with the flexible circuit board to form the module to be tested, determining the electrical property parameters of the flexible circuit board based on the total voltage of the module to be tested and the preset voltage when the preset electronic element inputs the constant current, and determining the test result of the flexible circuit board according to the comparison result between the obtained electrical property parameters and the target electrical property parameters. In this way, the electronic components are preset to
Further, based on the above embodiment, another embodiment of the flexible circuit board testing method of the present application is provided. In this embodiment, referring to fig. 7, the step S20 includes:
step S21, determining the test voltage of the flexible circuit board according to the total voltage and the preset voltage;
the test voltage specifically refers to the actual working voltage of the flexible circuit board in a test loop formed by the module to be tested and the constant current power supply.
Different total voltages and different preset voltages correspond to different test voltages. The preset voltage corresponding relationship between the total voltage, the preset voltage and the test voltage can be predetermined based on the connection mode (such as series connection or parallel connection) between the preset electronic element in the module to be tested and the flexible circuit board, whether the test loop formed by the module to be tested and the constant current power supply includes other power consumption devices except the preset electronic element and the flexible circuit board, the connection line condition (such as the connection line length, the connection line type and the like) between the elements in the test loop, and the like, and the preset voltage corresponding relationship can be a calculation relationship, a mapping relationship, an algorithm model and the like. And determining the test voltage of the flexible circuit board corresponding to the current total voltage and the preset voltage based on the voltage corresponding relation.
For example, in the present embodiment, when the preset electronic components, the constant current power supply, and the flexible circuit board form the test circuit in the manner of fig. 3 and 4, the total voltage = U0-U1, and the preset voltage is Ud, the test voltage = U0-U1-Ud. In other embodiments, the corresponding correction coefficient may also be determined according to the related factors when establishing the voltage correspondence, and the test voltage is obtained after correcting U0-U1-Ud based on the correction coefficient.
Step S22, determining the test resistance of the flexible circuit board according to the test voltage;
different test voltages correspond to different test resistances. Specifically, the corresponding relationship between the test voltage and the test resistance may be pre-established, and the corresponding relationship may be a calculation relationship (e.g., a function formula), a mapping relationship (e.g., a mapping table, etc.), an algorithm model, or the like. Based on the pre-established relationship, the test resistance corresponding to the current test voltage may be determined.
Specifically, in order to ensure that the obtained test resistor can accurately represent the circuit connection condition of the flexible circuit board, a preset corresponding relation between the test voltage and the test resistor can be established based on the constant current input by the module to be tested, and based on the preset corresponding relation, the preset corresponding relation between the test voltage and the test resistor is obtained according to the constant current; and determining the test resistance corresponding to the test voltage based on the preset corresponding relation. For example, in the present embodiment, when the predetermined electronic component, the constant current source, and the flexible circuit board form the test circuit in the manner of fig. 3 and 4, and the constant current is I, then there may be a correspondence relationship between the test resistance R and the test voltage that is R = (U0-U1-Ud)/I. And calculating the test resistance corresponding to the current test voltage based on the corresponding relation. In addition, in other embodiments, when the electronic component and the flexible circuit board are preset in a parallel connection manner or when other power consuming components are further included in the test circuit, the preset corresponding relationship between the test voltage and the test resistance can be established based on the constant current, so as to ensure the accuracy of the obtained test resistance.
And S23, determining the test resistance as the electrical property parameter.
In this embodiment, through the steps S21 to S23, the actual connection condition inside the flexible circuit board represented by the test resistance of the flexible circuit board is determined based on the total voltage and the preset voltage when the constant current is applied to the module to be tested, and the actual resistance of the flexible circuit board has different resistance values due to the normal circuit connection, the abnormal contact or the corrosion of the trace of the flexible circuit board.
Further, based on any one of the above embodiments, another embodiment of the flexible circuit board testing method is provided. In this embodiment, the flexible circuit board is provided with a plurality of signal lines, and referring to fig. 8, it is defined that step S10 inputs a constant current to the module to be tested, and the step S11 detects a total voltage of the module to be tested, before step S11, the method further includes:
step S101, when a preset electronic element and a flexible circuit board are connected based on a matched interface to form a module to be tested, determining a target signal line in a plurality of signal lines;
the target signal line may be specifically determined based on a predetermined test rule, or may be determined by acquiring a currently received test instruction. Specifically, each of the plurality of signal lines may be sequentially used as a target signal line according to a predetermined test rule, so that the connection condition of each signal line is accurately measured. In addition, the operator may also input a test command including identification information of a part of the target signal lines among the plurality of signal lines based on actual requirements, and obtain the target signal line by analyzing the test command.
The number of the target signal lines can be one or more than one according to actual requirements.
Step S102, determining a target control signal corresponding to the target signal line;
different target signal lines correspond to different target control signals. For example, based on fig. 5, the flexible circuit board includes 8 signal lines, the controller is provided with three signal interfaces U11, U2B, and U2C for transmitting the target control signal, each signal interface has two states of high level and low level, and the three signal interfaces can output 8 control signals in cooperation by arranging and combining the three signal interfaces and the two levels of each signal interface, and each control signal can correspond to one signal line in the flexible circuit board. For example, the control signals corresponding to the signal line 1 are U11 high level, U2B low level and U2C low level, the control signals corresponding to the signal line 2 are U11 high level, U2B high level and U2C high level, the control signals corresponding to the signal line 3 are U11 low level, U2B low level and U2C low level, and so on.
Step S103, inputting the target control signal to a change-over switch, and when receiving the target control signal, the change-over switch accesses the target signal line to a test loop formed by connecting the module to be tested with a constant current power supply, wherein the constant current power supply is a power supply module for inputting the constant current.
The transfer switch may control an on or off state of each signal line in the test loop based on the target control signal, and specifically, the transfer switch may control the target signal line corresponding to the target control signal to be connected to the test loop, and disconnect other signal lines except the target control line from the test loop.
It should be noted that, based on steps S101 to S103, the target electrical performance parameter is a target value or a target range that the electrical performance parameter of the target signal line needs to reach when the module to be tested is connected with a constant current. Different target signal lines can correspond to the same target electrical performance parameters or different target electrical performance parameters according to actual requirements.
In this embodiment, through change over switch's setting, can realize carrying out accurate measurement to the connection condition of appointed signal line in the flexible circuit board to guarantee that the testing result of flexible circuit board can satisfy the detection demand accurately.
The step of determining a target signal line in the plurality of signal lines includes that when each signal line is sequentially used as the target signal line, a test result of the flexible circuit board includes sub-test results respectively corresponding to each target signal line. Based on the above, when each sub-detection result is that the electrical performance parameter of the target signal line is within the corresponding target electrical performance parameter interval, determining that the flexible circuit board has a normal circuit connection result; and when any sub-detection result is that the electrical property parameter of the target signal line is outside the corresponding target electrical property parameter interval, determining that the test result of the flexible circuit board is abnormal circuit connection of the flexible circuit board.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a flexible circuit board test program is stored on the computer-readable storage medium, and when the flexible circuit board test program is executed by a processor, the relevant steps of any of the above flexible circuit board test methods are implemented.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A flexible circuit board testing method is characterized by comprising the following steps:
when a preset electronic element is connected with a flexible circuit board to form a module to be tested, inputting constant current to the module to be tested and detecting the total voltage of the module to be tested;
determining electrical performance parameters of the flexible circuit board according to the total voltage and a preset voltage; the preset voltage is preset voltage when the preset electronic element inputs the constant current;
determining a test result of the flexible circuit board according to the comparison result of the electrical performance parameters and the target electrical performance parameters;
the flexible circuit board is applied to projection equipment, the preset electronic element is a digital micro-mirror device which is used for being matched and connected with the flexible circuit board in the projection equipment, a diode is arranged in the digital micro-mirror device, and the preset voltage is a voltage drop when the diode is conducted through the constant current.
2. The flexible circuit board testing method of claim 1, wherein the step of determining the electrical performance parameter of the flexible circuit board from the total voltage and a preset voltage comprises:
determining the test voltage of the flexible circuit board according to the total voltage and the preset voltage;
determining the test resistance of the flexible circuit board according to the test voltage;
determining the test resistance as the electrical property parameter.
3. The flexible circuit board testing method of claim 2, wherein the step of determining the test resistance of the flexible circuit board according to the test voltage comprises:
obtaining a preset corresponding relation between the test voltage and the test resistor according to the constant current;
and determining the test resistance corresponding to the test voltage based on the preset corresponding relation.
4. The method for testing a flexible circuit board according to claim 2, wherein the flexible circuit board is provided with a plurality of signal lines, and before the step of inputting a constant current to the module under test and detecting a total voltage of the module under test, the method further comprises:
determining a target signal line in the signal lines when a preset electronic element and a flexible circuit board are connected based on a matched interface to form a module to be tested;
determining a target control signal corresponding to the target signal line;
and inputting the target control signal to a change-over switch, wherein the change-over switch accesses the target signal line to a test loop formed by connecting the module to be tested with a constant current power supply when receiving the target control signal, and the constant current power supply is a power supply module for inputting the constant current.
5. The flexible circuit board testing method of claim 4, wherein the step of determining a target signal line of the plurality of signal lines comprises:
and taking each signal line as the target signal line in turn.
6. The method of any of claims 1 to 5, wherein the target electrical performance parameter comprises a target electrical performance parameter interval, and the step of determining the test result of the flexible circuit board based on the comparison of the electrical performance parameter and the target electrical performance parameter comprises:
if the comparison result is that the target electrical performance parameter is within the target electrical performance parameter interval, determining that the test result is that the flexible circuit board is normal;
and if the comparison result is that the target electrical performance parameter is outside the target electrical performance parameter interval, determining that the test result is that the flexible circuit board is abnormal.
7. A flexible circuit board testing device, characterized in that, flexible circuit board testing device includes:
the preset electronic element is provided with a third interface, and the third interface is used for being connected with the interface of the flexible circuit board in a matching manner;
the constant current power supply is used for outputting constant current;
the voltage testing module is used for detecting voltage;
the controller, constant current power supply with voltage test module all with the controller is connected, the controller includes: a memory, a processor and a flexible circuit board test program stored on the memory and executable on the processor, the flexible circuit board test program when executed by the processor implementing the steps of the flexible circuit board test method of any one of claims 1 to 6;
the flexible circuit board is applied to projection equipment, the preset electronic element is a digital micro-mirror device which is used for being matched and connected with the flexible circuit board in the projection equipment, a diode is arranged in the digital micro-mirror device, and the preset voltage is the voltage drop of the diode when the diode is conducted through the constant current; and/or the presence of a gas in the atmosphere,
the flexible circuit board is provided with a plurality of signal lines, the flexible circuit board testing device further comprises a change-over switch, the change-over switch is used for switching different signal lines to be connected into the preset electronic element and a testing loop formed by connecting the flexible circuit board with the constant current power supply, and the change-over switch is connected with the controller.
8. A flexible circuit board test circuit, comprising:
the flexible circuit board testing device of claim 7; and
a flexible circuit board having a fourth interface that mates with the third interface;
wherein the third interface is connected with the fourth interface; the module formed by the preset electronic element and the flexible circuit board is defined as a module to be tested, the output end of the constant current power supply is connected with the input end of the module to be tested, the output end of the module to be tested is connected with the input end of the constant current power supply, and the voltage testing module is used for testing the total voltage of the module to be tested.
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| CN113993273A (en) * | 2021-10-22 | 2022-01-28 | 京东方科技集团股份有限公司 | Display device and test method thereof |
| CN114692557B (en) * | 2022-06-01 | 2022-08-16 | 深圳市鄱阳科技有限公司 | Flexible circuit board manufacturing performance monitoring and analyzing method and system |
| CN218524827U (en) * | 2022-08-03 | 2023-02-24 | 江苏时代新能源科技有限公司 | Flexible circuit board test system |
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