CN211928089U - Detection device for printed circuit board assembly - Google Patents
Detection device for printed circuit board assembly Download PDFInfo
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- CN211928089U CN211928089U CN201922201042.2U CN201922201042U CN211928089U CN 211928089 U CN211928089 U CN 211928089U CN 201922201042 U CN201922201042 U CN 201922201042U CN 211928089 U CN211928089 U CN 211928089U
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- board assembly
- circuit board
- printed circuit
- sampling
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Abstract
The utility model discloses a detection apparatus for printed circuit board assembly. The detection device comprises a main control circuit, a sampling circuit, and test probes and voltage division circuits which are the same in number as the voltage test points in the printed circuit board assembly to be detected. The detection device can rapidly detect whether each path of voltage test point in the printed circuit board assembly to be detected has a short circuit condition through the sampling circuit and the voltage division circuit, and accurately measure the voltage to be detected of each path of voltage test point. On the other hand, the test result and the voltage value to be tested of each path of voltage test point are displayed through the display screen, so that the staff can conveniently check the test result, the detection efficiency is improved, the detection cost is reduced, and the method is particularly suitable for mass production test of the printed circuit board assembly to be tested.
Description
Technical Field
The utility model relates to a detection apparatus for printed circuit board belongs to test technical field.
Background
Printed Circuit Board Assembly (PCBA), i.e. a Printed Circuit Board (PCB) to which electronic components have been soldered, with the continuous development of electronic technology, more and more chips are soldered on the Printed Circuit Board, so that the Printed Circuit Board Assembly is used to more and more different voltages.
At present, whether each voltage has a short circuit and whether the voltage normally detects on the printed circuit board assembly, generally rely on the manual work to use the universal meter to detect each voltage test point respectively, this kind of detection mode efficiency is lower, and the cost is higher, but also has lou to examine, the wrong problem of examining etc..
Disclosure of Invention
The utility model aims to solve the technical problem that a detection device of printed circuit board subassembly is provided.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a detection device for a printed circuit board assembly comprises a main control circuit, a sampling circuit, test probes and a voltage division circuit, wherein the number of the test probes and the voltage division circuit is equal to that of voltage test points in the printed circuit board assembly to be detected; the input end of each test probe is correspondingly connected with the voltage test point, the output end of each test probe is correspondingly connected with the detection end of the sampling circuit and the input end of the corresponding voltage division circuit, the output ends of the sampling circuit and the voltage division circuit are respectively connected with the corresponding input end of the main control circuit, and the output end of the main control circuit is connected with the control end of the sampling circuit.
Preferably, the detection device of the printed circuit board assembly further comprises a measurement bracket for fixing the printed circuit board assembly to be tested, and the measurement bracket is provided with a test port correspondingly connected with each path of voltage test point in the printed circuit board assembly to be tested and used for connecting the test probe.
Preferably, the sampling circuit comprises a constant voltage source, a sampling resistor, a current detection amplifier and a single-pole multi-throw switch; the constant voltage source is connected with one end of the sampling resistor, the other end of the sampling resistor is connected with a movable contact of the single-pole multi-throw switch, each fixed contact of the single-pole multi-throw switch is connected with one voltage test point through a corresponding test probe, and the current detection amplifier is connected in parallel at two ends of the sampling resistor and used for collecting the sampling voltage of the sampling resistor and transmitting the sampling voltage to the main control circuit.
Preferably, each voltage dividing circuit comprises a first resistor and a second resistor, and one end of the first resistor is used as an input end of the voltage dividing circuit and is used for being connected with an output end of the corresponding test probe; the other end of the first resistor is connected with one end of the second resistor together to serve as the output end of the voltage division circuit and is used for being connected with the voltage input end of the main control circuit, and the other end of the second resistor is grounded.
Preferably, the detection device of the printed circuit board assembly further comprises a display screen, and the display screen is connected with the main control circuit.
Preferably, the detection device of the printed circuit board assembly further comprises a power supply circuit, an input end of the power supply circuit is connected with the main control circuit, and an output end of the power supply circuit is connected with the printed circuit board assembly to be detected.
Preferably, the master control circuit is composed of a single chip microcomputer with an analog-to-digital conversion function and a peripheral circuit thereof.
The utility model provides a detection device of printed circuit board assembly realizes the condition whether the short circuit appears in each way voltage test point in the quick detection printed circuit board assembly that awaits measuring through setting up sampling circuit and bleeder circuit on the one hand to the voltage that awaits measuring of every way voltage test point of accurate measurement. On the other hand, the test result and the voltage value to be tested of each path of voltage test point are displayed in time through the display screen, so that the staff can check the test result, the detection efficiency is improved, the detection cost is reduced, and the method is particularly suitable for mass production test of the printed circuit board assembly to be tested.
Drawings
Fig. 1 is a schematic structural diagram of a detection device for a printed circuit board assembly according to the present invention;
fig. 2 is a schematic diagram of a sampling circuit in the detection apparatus for a printed circuit board assembly provided by the present invention;
fig. 3 is a schematic diagram of a voltage dividing circuit in the detecting device of the printed circuit board assembly provided by the present invention.
Detailed Description
The technical content of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the detection device for a printed circuit board assembly provided by the present invention comprises a main control circuit 1, a sampling circuit 2, and a test probe 3 and a voltage dividing circuit 4 which are equal in number to the voltage test points in the printed circuit board assembly to be tested; the input end of each test probe 3 is correspondingly connected with the voltage test point, the output end of each test probe 3 is correspondingly connected with the detection end of the sampling circuit 2 and the input end of the corresponding voltage division circuit 4, the output ends of the sampling circuit 2 and the voltage division circuit 4 are respectively connected with the corresponding input end of the main control circuit 1, and the output end of the main control circuit 1 is connected with the control end of the sampling circuit 2.
The sampling circuit 2 detects the sampling voltages of the voltage test points in the printed circuit board assembly to be tested one by one, the sampling voltages are respectively transmitted to the main control circuit 1 to obtain the impedance of each voltage test point to ground, and the main control circuit 1 determines whether each voltage test point has a short circuit condition according to the threshold resistance set in advance. Meanwhile, after the voltage to be measured of each voltage test point is divided to a proper voltage by each voltage dividing circuit 4, the voltage is transmitted to the main control circuit 1, and the main control circuit 1 obtains the voltage to be measured of each voltage test point according to the preset voltage dividing proportion of the voltage dividing circuits 4.
The detection device of the printed circuit board assembly is also provided with a measurement bracket 7 for fixing the printed circuit board assembly to be detected, and the measurement bracket 7 is provided with a test port which is correspondingly connected with each path of voltage test point in the printed circuit board assembly to be detected and is used for connecting test probes, so that one test probe is correspondingly connected with one path of voltage test point; then, the multiple voltage test points correspond to multiple test probe connections.
As shown in fig. 2, the sampling circuit 2 includes a constant voltage source V, a sampling resistor Rx, a current detection amplifier 21, and a single-pole multi-throw switch 22. The constant voltage source V is connected with one end of a sampling resistor Rx, the other end of the sampling resistor Rx is connected with a movable contact of the single-pole multi-throw switch 22, and each static contact of the single-pole multi-throw switch 22 is connected with one voltage test point through a corresponding test probe; the current detection amplifier 21 is connected in parallel to two ends of the sampling resistor Rx, and is configured to collect the sampling voltage Vx of the sampling resistor Rx and transmit the sampling voltage Vx to the main control circuit. The voltage value of the constant voltage source V is determined according to the magnitude of the sampling resistor Rx, and generally, the constant voltage source V is 5V. The resistance value of the sampling resistor Rx is adjusted according to the sampling voltage collected by the current detection amplifier 21 and the voltage range of the voltage to be measured at the voltage test point.
The main control circuit 1 controls the movable contacts of the single-pole multi-throw switch 22 to be switched to a certain path of voltage test point one by one or randomly so that the current detection amplifier 21 collects the sampling voltage value Vx of the sampling resistor Rx and outputs the sampling voltage value Vx to the main control circuit 1, and the main control circuit 1 calculates the ground impedance of each path of voltage test point by adopting the following formula according to the received sampling voltage value Vx of the sampling resistor Rx corresponding to each path of voltage test point. The main control circuit 1 is composed of a single chip microcomputer with an analog-to-digital conversion function and a peripheral circuit thereof.
Ro＝(V÷Vx/Rx)-Rx (1)
Wherein, Ro represents the ground impedance of a certain path of voltage test point, V represents the voltage value of the constant voltage source, and Vx represents the sampling voltage value Vx of the sampling resistor Rx. According to the voltage range fluctuation condition of the constant voltage source and the accuracy of the voltage dividing circuit, a threshold resistor is set in the main control circuit 1 in advance, so that the main control circuit 1 can judge whether each voltage test point is short-circuited or not according to the threshold resistor. Specifically, the main control circuit 1 compares the obtained impedance to ground corresponding to each path of voltage test point with the threshold resistance, and if the resistance value of the impedance to ground of a certain path of voltage test point is less than or equal to the set threshold resistance, it is determined that the voltage test point is short-circuited.
As shown in fig. 3, the voltage test points Vo to Vn in the printed circuit board assembly to be tested respectively correspond to one test probe 3, and each test probe 3 respectively corresponds to one voltage dividing circuit 4, so that each voltage dividing circuit 4 can measure the voltage to be tested of the corresponding voltage test point. And after the voltage to be measured of the corresponding voltage test point is divided to a proper voltage through each voltage dividing circuit 4, the voltage to be measured of each voltage test point is transmitted to the main control circuit 1 to obtain the voltage to be measured of each voltage test point, so that the voltage to be measured of the voltage test points is prevented from being overlarge and exceeding the measurement range. Each voltage division circuit 4 comprises a first resistor Ra and a second resistor Rb, and one end of the first resistor Ra is used as an input end of the voltage division circuit 4 and is connected with the output end of the corresponding test probe 3; the other end of the first resistor Ra and one end of the second resistor Rb are connected together to serve as an output end of the voltage dividing circuit 4, and are used for being connected with a voltage input end of the main control circuit 1, and the other end of the second resistor Rb is grounded. The voltage to be measured of the corresponding voltage test point is divided to a proper voltage through the voltage division effect of the first resistor Ra and the second resistor Rb. The resistance values of the first resistor Ra and the second resistor Rb are adjusted according to the actual voltage to be measured of the voltage test point.
As shown in fig. 1, in order to facilitate the staff to check whether the voltage test points in the printed circuit board assembly to be tested are short-circuited and to obtain the voltage to be tested of each voltage test point, a display screen 5 may be provided in the detection apparatus for the printed circuit board assembly to display. The display screen can adopt any display screen with a display function, such as an LCD display screen and the like. When a sampling circuit 2 detects one path of voltage test point, if the main control circuit 1 confirms that the voltage test point has a short circuit, the display screen is controlled to display; if the main control circuit 1 determines that the voltage test point has no short circuit, the short circuit detection is continuously performed on the next voltage test point until all the voltage test points are detected. And, every time the voltage to be measured of one path of voltage test point is obtained through the voltage division circuit, the main control circuit 1 controls the display screen to display
As shown in fig. 1, the detection device of the printed circuit board assembly is further provided with a power supply circuit 6, an input end of the power supply circuit 6 is connected with the main control circuit 1, and an output end of the power supply circuit 6 is connected with the printed circuit board assembly to be detected. When the situation that all the voltage test points are not short-circuited is detected, the power supply circuit 6 is controlled by the main control circuit 1 to supply power to the printed circuit board assembly to be tested. The power supply circuit 6 is a conventional power supply circuit, and is not described herein again.
The utility model provides a detection device of printed circuit board assembly realizes the condition whether the short circuit appears in each way voltage test point in the quick detection printed circuit board assembly that awaits measuring through setting up sampling circuit and bleeder circuit on the one hand to the voltage that awaits measuring of every way voltage test point of accurate measurement. On the other hand, the test result and the voltage value to be tested of each path of voltage test point are displayed in time through the display screen, so that the staff can check the test result, the detection efficiency is improved, the detection cost is reduced, and the method is particularly suitable for mass production test of the printed circuit board assembly to be tested.
The above is a detailed description of the detecting device for the printed circuit board assembly provided by the present invention. Any obvious modifications to the device, which would be obvious to those skilled in the art, without departing from the essential spirit of the invention, are intended to be covered by the appended claims.
Claims (7)
1. A detection device of a printed circuit board assembly is characterized by comprising a main control circuit, a sampling circuit, test probes and a voltage division circuit, wherein the number of the test probes and the voltage division circuit is equal to that of voltage test points in the printed circuit board assembly to be detected; the input end of each test probe is correspondingly connected with the voltage test point, the output end of each test probe is correspondingly connected with the detection end of the sampling circuit and the input end of the corresponding voltage division circuit, the output ends of the sampling circuit and the voltage division circuit are respectively connected with the corresponding input end of the main control circuit, and the output end of the main control circuit is connected with the control end of the sampling circuit.
2. The apparatus for inspecting printed circuit board assembly according to claim 1, further comprising a measuring bracket for fixing the printed circuit board assembly to be inspected, wherein the measuring bracket is provided with a testing port corresponding to each voltage testing point in the printed circuit board assembly to be inspected for connecting the testing probe.
3. The inspection device for a printed circuit board assembly of claim 1, wherein:
the sampling circuit comprises a constant voltage source, a sampling resistor, a current detection amplifier and a single-pole multi-throw switch; the constant voltage source is connected with one end of the sampling resistor, the other end of the sampling resistor is connected with a movable contact of the single-pole multi-throw switch, each fixed contact of the single-pole multi-throw switch is connected with one voltage test point through a corresponding test probe, and the current detection amplifier is connected in parallel at two ends of the sampling resistor and used for collecting the sampling voltage of the sampling resistor and transmitting the sampling voltage to the main control circuit.
4. The inspection device for a printed circuit board assembly of claim 1, wherein:
each voltage division circuit comprises a first resistor and a second resistor, wherein one end of the first resistor is used as the input end of the voltage division circuit and is used for being connected with the output end of the corresponding test probe; the other end of the first resistor is connected with one end of the second resistor together to serve as the output end of the voltage division circuit and is used for being connected with the voltage input end of the main control circuit, and the other end of the second resistor is grounded.
5. The apparatus for testing a printed circuit board assembly of claim 1, further comprising a display screen, wherein the display screen is connected to the master control circuit.
6. The apparatus for inspecting printed circuit board assembly of claim 1, further comprising a power supply circuit, wherein an input terminal of the power supply circuit is connected to the main control circuit, and an output terminal of the power supply circuit is connected to the printed circuit board assembly under test.
7. The inspection device for a printed circuit board assembly of claim 1, wherein:
the master control circuit consists of a singlechip with an analog-digital conversion function and a peripheral circuit thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922201042.2U CN211928089U (en) | 2019-12-10 | 2019-12-10 | Detection device for printed circuit board assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922201042.2U CN211928089U (en) | 2019-12-10 | 2019-12-10 | Detection device for printed circuit board assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211928089U true CN211928089U (en) | 2020-11-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922201042.2U Active CN211928089U (en) | 2019-12-10 | 2019-12-10 | Detection device for printed circuit board assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211928089U (en) |
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2019
- 2019-12-10 CN CN201922201042.2U patent/CN211928089U/en active Active
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