An online test circuit and device for a PCBA circuit board

Abstract

The utility model discloses a kind of online test circuit and device of PCBA circuit board, the online test circuit includes antistatic module, charging module, power module, probe detection module, alarm module and display module;Antistatic module connects charging module;Charging module connects power module;Power module connects probe detection module, alarm module and display module;Probe detection module connects power module and alarm module, and between probe detection module and power module, alarm module is open circuit, and pass is formed by connecting the PCBA circuit board to be tested;Alarm module connects display module, and alarm module issues alarm according to whether with probe detection module and the pass formed by PCBA circuit board to be tested;Display module connects alarm module, and display module shows detection information according to the detection result of alarm module.

Description

Technical Field

[0001] This application belongs to the field of PCBA circuit board testing technology, specifically referring to an online testing circuit and device for PCBA circuit boards. Background Technology

[0002] In the PCBA (Printed Circuit Board Assembly) manufacturing industry, existing PCBA boards are generally not subjected to detailed circuit testing during the production process unless there are special requirements. Short circuit boards are not tested. PCBA boards are produced directly according to the submitted Gerber files, and then surface mount technology is used to process them into PCBA boards without conducting detailed sampling inspections.

[0003] Meanwhile, PCBA boards that have completed production will not undergo full circuit testing unless there are special requirements, which may cause various problems in the finished products. Furthermore, detailed testing also incurs high costs and time. For example, flying probe testing of a standard PCB board requires expensive flying probe testing machines and takes a long time, approximately one to three hours to test a single board, with some unnecessary points being omitted. In addition, composite mold testing, while potentially reducing time, requires the manufacture of separate molds. The production of composite molds consists of layers of boards, including pins, wire bonding, and ribbon cables, making it costly and time-consuming to produce. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this application provides an online testing circuit and device for PCBA circuit boards, which has a simple structure and can quickly perform random inspections on various PCBA circuit boards after production.

[0005] This utility model provides an online testing circuit for PCBA circuit boards, the online testing circuit including an anti-static module, a charging module, a power supply module, a probe detection module, an alarm module, and a display module; The anti-static module is connected to the charging module, and the anti-static module is used to prevent high-voltage impact of external static electricity on the online test circuit; The charging module is connected to the power module, and the charging module is used to charge the power module; The power module is connected to the probe detection module, the alarm module, and the display module, and the power module provides power to the online test circuit. The probe detection module is connected to the power module and the alarm module. There is no circuit between the probe detection module, the power module, and the alarm module. A circuit is formed by connecting the probe detection module to the PCBA circuit board to be tested. The alarm module is connected to the display module, and the alarm module issues an alarm based on whether it forms a path with the probe detection module and the PCBA circuit board to be tested. The display module is connected to the alarm module, and the display module displays detection information based on the detection results of the alarm module.

[0006] Furthermore, according to the online test circuit of the PCBA circuit board provided in this application, the anti-static module includes at least one set of RC units, wherein the RC unit is composed of a resistor and a capacitor connected in parallel; one end of the RC unit is grounded, and the other end of the RC unit is connected to the charging module. Furthermore, according to the online test circuit of the PCBA circuit board provided in this application, the charging module includes a charging interface USB1, a charging chip U2, and a connection circuit between the charging interface USB1 and the charging chip U2. The charging module is connected to an external charging power source through the charging interface USB1, and the charging chip U2 converts the voltage of the external charging power source to the charging voltage of the power module. Furthermore, according to the online test circuit of the PCBA circuit board provided in this application, the charging interface USB1 is a Type-C charging interface.

[0007] Furthermore, according to the online test circuit of the PCBA circuit board provided in this application, the power module is a lithium battery, one end of the lithium battery is connected to the charging module, and the other end of the lithium battery is grounded. Furthermore, according to the online testing circuit of the PCBA circuit board provided in this application, the probe detection module includes a first detection hole and a second detection hole. The first detection hole is connected to the power supply module, and the second detection hole is connected to the alarm module. There is an open circuit between the first detection hole and the second detection hole. Furthermore, according to the online test circuit of the PCBA circuit board provided in this application, the alarm module includes a buzzer and a connection circuit connected to the buzzer and the second detection hole. Furthermore, according to the online test circuit of the PCBA circuit board provided in this application, the online test circuit also includes a WiFi module, which is connected to the alarm module and the display module, and the WiFi module transmits the status information of the online test circuit to the outside. Furthermore, according to the online test circuit of the PCBA circuit board provided in this application, the online test circuit further includes a memory module, which is connected to the alarm module and the display module, and the memory module stores the alarm information of the alarm module.

[0008] This application also provides an online testing device for PCBA circuit boards. The online testing device includes a housing, a detection port, a charging port, and a circuit board on which the online testing circuit of the PCBA circuit board described in this application is arranged. The circuit board is disposed inside the housing, and the detection port and the charging port are both connected to the circuit board.

[0009] The beneficial effects of this utility model are as follows: The online testing circuit and device for PCBA circuit boards provided in this application have a simple circuit structure. It directly connects to the PCBA circuit board under test via a probe detection module, and the state of the PCBA circuit board under test can be determined by the continuity of the circuit. This allows for effective testing of the PCBA circuit board. The online testing circuit for PCBA circuit boards provided in this application is low in cost, easy to operate, and suitable for large-scale application. Attached Figure Description

[0010] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the online test circuit for the PCBA circuit board provided in this embodiment. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0013] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0014] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0015] The embodiments of this application will now be further described in conjunction with the accompanying drawings and specific implementation details.

[0016] Figure 1 This is a schematic diagram of the online test circuit for the PCBA circuit board provided in this embodiment.

[0017] like Figure 1 As shown, the online testing circuit includes an anti-static module, a charging module, a power supply module, a probe detection module, an alarm module, and a display module. The anti-static module is connected to the charging module and is used to prevent high-voltage surges from external static electricity from burning out the circuit. The charging module is connected to the power supply module and is used to charge the power supply module, improving its continuous operating capability. The power supply module is connected to the probe detection module, the alarm module, and the display module, and provides power to the online testing circuit. The probe detection module is connected to the power supply module and the alarm module, forming an open circuit between the probe detection module, the power supply module, and the alarm module, but creating a circuit through the PCBA circuit board under test. The alarm module is connected to the display module and issues an alarm based on whether it forms a circuit with the probe detection module and the PCBA circuit board under test. The display module is connected to the alarm module and displays the detection information based on the alarm module's detection results.

[0018] Specifically, such as Figure 1 As shown, the anti-static module includes at least one set of RC units, each consisting of a resistor and a capacitor connected in parallel. In this embodiment, one set of RC units is used as an example. The resistor R4 and the capacitor C1 are connected in parallel to form an RC unit, one end of which is grounded, and the other end is connected to the charging module.

[0019] The charging module includes a charging interface USB1, a charging chip U2, and a connection circuit between the charging interface USB1 and the charging chip U2. The charging module is connected to an external charging power source through the charging interface USB1, and the charging chip U2 converts the voltage of the external charging power source to the charging voltage of the power module. In this embodiment, the charging chip U2 is model TP4057-MS.

[0020] Specifically, all EH ports of the USB1 charging interface are connected to the RC unit. The B12 port of the USB1 charging interface is grounded. The B9 port of the USB1 charging interface is connected to the 5V VCC voltage through fuse F1. The A5 port of the USB1 charging interface is grounded through resistor R2. The B5 port of the USB1 charging interface is grounded through resistor R1. The A9 port of the USB1 charging interface is connected to the B9 port of the USB1 charging interface. The A12 port of the USB1 charging interface is grounded. One end of diode D1 is grounded together with resistor R2, and the other end of diode D1 is connected to the 5V VCC voltage.

[0021] Port 1 of the charging chip U2 is connected to the 5V VCC voltage via a series resistor R6 and an LED. Port 2 of the charging chip U2 is grounded. One end of the parallel connection between diode D2 and capacitor C3 is connected to port 3 of the charging chip U2, and the other end is grounded. Port 4 of the charging chip U2 is connected to the 5V VCC voltage. Port 5 of the charging chip U2 is connected to the LED. One end of resistor R7 is grounded, and the other end is connected to port 6 of the charging chip U2. One end of capacitor C2 is connected to the 5V VCC voltage, and the other end of capacitor C2 is grounded.

[0022] In this embodiment, the charging interface USB1 is a Type-C charging interface. The Type-C charging interface, combined with the charging chip U2, enables rapid charging of the power module, significantly improving its charging speed. The charging interface USB1 can be powered by a standard 5V power supply, such as a computer's Type-C 5V power supply. This can be achieved by directly plugging a standard USB-to-Type-C cable into the computer, or by directly connecting a Type-C 5V plug.

[0023] The power module is a lithium battery, one end of which is connected to the charging module, and the other end is grounded. Specifically, as shown... Figure 1 As shown, pin 1 of lithium battery U1 is grounded, and pin 2 of lithium battery U1 is connected to port 3 of the charging chip U2 to receive charging from the charging module.

[0024] The probe detection module includes a first detection port SC1 and a second detection port SC2. The first detection port SC1 is connected to the power supply module and grounded, and the second detection port SC2 is connected to the alarm module. There is an open circuit between the first detection port SC1 and the second detection port SC2. The first detection port SC1 and the second detection port SC2 are connected by soldered probe pin sockets, allowing for plug-and-play probe use. Each module is connected by a different wiring network (copper wires on the PCB).

[0025] The assembly process of the first detection hole SC1 and the second detection hole SC2 includes: welding the probe holder to the first detection hole SC1 and the second detection hole SC2, requiring the backplate interface to be flattened after welding, and paying attention to the orientation of the welded interface. Welding the base of the lithium battery U1 requires a heating table. The base of the lithium battery U1 is made of plastic, which is prone to melting at temperatures exceeding 200 degrees Celsius. The solder pads on the base of the lithium battery U1 are relatively small, necessitating welding with a heating table, and attention must be paid to the orientation of the welded position.

[0026] The alarm module includes a buzzer and a connection circuit connected to the buzzer and the second detection hole. Specifically, as shown... Figure 1 As shown, one end of resistor R5 is connected to the second detection port SC2, and the other end is connected to the emitter of transistor Q2. Port 1 of switch SW1 is connected to pin 2 of the lithium battery U1; port 2 of switch SW1 is connected to the positive terminal of buzzer BUZZER1; port 3 of switch SW1 is unused; port 4 of switch SW1 is connected to pin 2 of the lithium battery U1; port 5 of switch SW1 is connected to control chip U5; and port 6 of switch SW1 is unused. The negative terminal of buzzer BUZZER1 is connected to the collector of transistor Q1, the emitter of transistor Q1 is connected to the base of transistor Q2, and the base of transistor Q1 is connected to the collector of transistor Q2. One end of resistor R3 is connected to the positive terminal of buzzer BUZZER1, and the other end of resistor R3 is connected to the base of transistor Q1.

[0027] In this embodiment, the control chip U5 is model AMS1117-3.3. Capacitor C10 is connected to ports 1 and 3 of the control chip U5, and port 3 of the control chip U5 is connected to port 5 of the switch SW1. Port 2 of the control chip U5 is unused. Port 4 of the control chip U5 is connected to a 3V VCC voltage. One end of capacitor C11 is connected to port 4 of the control chip U5, and the other end of capacitor C11 is grounded.

[0028] The display module includes a display screen and peripheral circuitry for the display screen. In this embodiment, an OLED display screen is used as an example. The OLED display screen is connected to a control chip U3. In this embodiment, the control chip U3 is model STC8H1K08-36I-TSSOP20. The control chip U3 is communicatively connected to the control chip U5, receives information from the control chip U5, and controls the OLED display screen to display the continuity information of the PCBA circuit board under test.

[0029] like Figure 1 As shown in this embodiment, the online test circuit further includes a WiFi module, which is connected to the alarm module and the display module. The WiFi module transmits the status information of the online test circuit to the outside world. Adding the WiFi module allows the collected data to be displayed on the OLED screen, showing the specific continuity of components or different signal networks on the PCBA circuit board under test. The WiFi module can also upload the test data to the cloud for detailed data analysis, making the information detected by the testing device more refined, clear, and concise.

[0030] The online testing circuit also includes a memory module connected to the alarm module and the display module. The memory module stores alarm information from the alarm module. The control module can convert and send the detected data to the corresponding serial port, allowing direct viewing of data changes on a PC. Visual operation is possible, and the system can be easily configured through the memory module. It can detect more data, accurately locate required information, and add more functions, but this requires higher technical expertise, is more complex to operate, and is more costly.

[0031] The working principle of the online testing circuit for the PCBA circuit board provided in this embodiment is as follows: Check whether there is a short circuit or open circuit at the corresponding point on the PCBA circuit board under test: Before testing, turn on the switch of the detection circuit. Reserve test points on the PCBA board to be tested (if there are no test points, the exposed pads are generally tested). During testing, align any one of the test probes in the detection circuit with the test point or pad, keep the test position still, and align the other test probe with the GND test point or GND pad. Listen for feedback from the buzzer in the detection circuit. If the test point is short-circuited to GND, the buzzer in the detection circuit will be grounded and form a loop, and the buzzer will immediately sound an alarm. If there is no short circuit, the buzzer will not form a loop and will not sound. The control chip of the display module receives the message and displays it on the OLED screen. A short circuit will indicate "Short Circuit" and an open circuit will indicate "Open Circuit".

[0032] Check whether there is a short circuit or open circuit at both ends of the specific components on the PCBA circuit board under test: Before testing, turn on the switch of the detection circuit and directly test the exposed pads at both ends of the component on the PCBA circuit board to be tested. Place the two detection probes on the pads of the component under test (there is no left or right distinction). By listening to the sound feedback from the buzzer of the alarm detection module, determine whether the component is short-circuited. If the component is short-circuited, the buzzer in the detection circuit will sound an alarm because the short circuit at both ends of the component forms a loop. If there is no short circuit, the buzzer in the detection circuit will not sound an alarm, and the control chip of the display module will receive the message and display it on the OLED display screen. A short circuit will be indicated as "short circuit", and an open circuit will be indicated as "open circuit".

[0033] This embodiment also provides an online testing device for PCBA circuit boards. The online testing device includes a housing, a detection port, a charging port, and a circuit board on which the online testing circuit of the PCBA circuit board as described in this embodiment is arranged. The circuit board is disposed inside the housing, and the detection port and the charging port are both connected to the circuit board.

[0034] This application provides an online testing circuit and device for PCBA circuit boards. The circuit structure is simple, directly connecting to the PCBA circuit board under test via a probe detection module. The state of the PCBA circuit board under test can be determined by observing the continuity of the circuit. This effectively tests the PCBA circuit board. The online testing circuit for PCBA circuit boards provided in this application is low-cost, easy to operate, and suitable for large-scale application.

[0035] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0036] The online testing circuit and device for PCBA circuit boards provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An online testing circuit for a PCBA circuit board, characterized in that, The online testing circuit includes an anti-static module, a charging module, a power supply module, a probe detection module, an alarm module, and a display module. The anti-static module is connected to the charging module, and the anti-static module is used to prevent high-voltage impact of external static electricity on the online test circuit; The charging module is connected to the power module, and the charging module is used to charge the power module; The power module is connected to the probe detection module, the alarm module, and the display module, and the power module provides power to the online test circuit. The probe detection module is connected to the power module and the alarm module. There is no circuit between the probe detection module, the power module, and the alarm module. A circuit is formed by connecting the probe detection module to the PCBA circuit board to be tested. The alarm module is connected to the display module, and the alarm module issues an alarm based on whether it forms a path with the probe detection module and the PCBA circuit board to be tested. The display module is connected to the alarm module, and the display module displays detection information based on the detection results of the alarm module.

2. The online test circuit for the PCBA circuit board according to claim 1, characterized in that, The anti-static module includes at least one set of RC units, each RC unit consisting of a resistor and a capacitor connected in parallel; one end of the RC unit is grounded, and the other end of the RC unit is connected to the charging module.

3. The online test circuit for the PCBA circuit board according to claim 2, characterized in that, The charging module includes a charging interface USB1, a charging chip U2, and a connection circuit between the charging interface USB1 and the charging chip U2. The charging module is connected to an external charging power source through the charging interface USB1, and the charging chip U2 converts the voltage of the external charging power source to the charging voltage of the power module.

4. The online test circuit for the PCBA circuit board according to claim 3, characterized in that, The charging interface USB1 is a Type-C charging interface.

5. The online test circuit for the PCBA circuit board according to claim 3, characterized in that, The power module is a lithium battery, one end of which is connected to the charging module, and the other end of which is grounded.

6. The online test circuit for the PCBA circuit board according to claim 5, characterized in that, The probe detection module includes a first detection hole and a second detection hole. The first detection hole is connected to the power module, and the second detection hole is connected to the alarm module. There is an open circuit between the first detection hole and the second detection hole.

7. The online test circuit for the PCBA circuit board according to claim 6, characterized in that, The alarm module includes a buzzer and a connection circuit connected to the buzzer and the second detection hole.

8. The online test circuit for the PCBA circuit board according to claim 1, characterized in that, The online test circuit also includes a WiFi module, which is connected to the alarm module and the display module. The WiFi module transmits the status information of the online test circuit to the outside world.

9. The online test circuit for PCBA circuit boards according to claim 1, characterized in that, The online test circuit also includes a memory module, which is connected to the alarm module and the display module, and stores the alarm information of the alarm module.

10. An online testing device for PCBA circuit boards, characterized in that, The online testing device includes a housing, a detection port, a charging port, and a circuit board on which an online testing circuit for a PCBA circuit board as described in any one of claims 1 to 9 is arranged; the circuit board is disposed inside the housing, and the detection port and the charging port are both connected to the circuit board.

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