CN218866043U - PCBA short circuit detection circuitry and detecting system - Google Patents
PCBA short circuit detection circuitry and detecting system Download PDFInfo
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- CN218866043U CN218866043U CN202223382062.2U CN202223382062U CN218866043U CN 218866043 U CN218866043 U CN 218866043U CN 202223382062 U CN202223382062 U CN 202223382062U CN 218866043 U CN218866043 U CN 218866043U
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Abstract
The utility model discloses a PCBA short circuit detection circuit and detection system, the detection circuit includes a first analog switch IC, a second analog switch IC, a comparator, a controller and a power supply, the switch pins of the two analog switch ICs are in one-to-one correspondence and are electrically connected; the output end of the first analog switch IC is electrically connected with the inverting input end of the comparator, is electrically connected with a power supply through a first resistor, and is grounded through a second resistor; the output end of the second analog switch IC is electrically connected with the power supply through a third resistor and a fourth resistor, and a connecting point between the third resistor and the fourth resistor is electrically connected with the non-inverting input end of the comparator; the switch pins of the two analog switch ICs are configured to be electrically connected with a point to be tested on the PCBA, and the controller is respectively electrically connected with the switch control ends of the two analog switch ICs and controls different switch pins of the two analog switch ICs to be conducted with the output ends of the two analog switch ICs; the output end of the comparator is electrically connected with the input end of the controller.
Description
Technical Field
The utility model relates to an integrated circuit field especially relates to a PCBA short circuit detection circuitry and detecting system.
Background
In the manufacturing process of the circuit board, short circuit may occur at some points on the circuit board due to the defects of the components or problems in the manufacturing process. If the short circuit problem of the circuit board is not effectively detected and the circuit board is directly electrified, the circuit board may be damaged. Therefore, it is necessary to perform a short circuit test for the circuit board in order to ensure the safe, stable and effective operation of the circuit board.
In the prior art, two short circuit test methods of a circuit board are generally available, wherein one method adopts a pure hardware connection detection circuit which is connected with an LED indicator lamp in series for detection, two ends of the detection circuit are connected with two adjacent test points, the two test points are connected with different electric potentials, and if a short circuit exists, the LED can be lightened. The test method can only detect one or more test points at one time, when the test method is applied to the test of a circuit board with more test points, the test can be completed by multiple tests, the test time is longer, the labor is wasted, and the test is easy to miss and miss. The other testing method is to adopt special automatic equipment to carry out short circuit testing on the circuit board, and the testing method has high accuracy and efficiency, but the cost is high, and the method is difficult to be born by some enterprises.
The above background disclosure is only used for assisting understanding of the concept and technical solutions of the present invention, and it does not necessarily belong to the prior art of the present patent application, nor does it necessarily give technical teaching; the above background should not be used to assess the novelty and inventive aspects of the present application in the absence of express evidence that the above disclosure is published prior to the filing date of the present patent application.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a PCBA short circuit detection circuitry can carry out the short circuit test to the station of waiting on the PCBA high-efficiently to it is with low costs.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a PCBA short circuit detection circuit is used for carrying out short circuit test on a point to be tested on the PCBA, and comprises a first analog switch IC, a second analog switch IC, a comparator, a controller and a power supply, wherein the first analog switch IC and the second analog switch IC are respectively provided with a plurality of switch pins, a switch control end and an output end, and the switch pins of the first analog switch IC are in one-to-one correspondence with the switch pins of the second analog switch IC and are electrically connected with each other;
the output end of the first analog switch IC is electrically connected with the inverting input end of the comparator, is electrically connected with the power supply through a first resistor, and is grounded through a second resistor;
the output end of the second analog switch IC is electrically connected with the power supply through a third resistor and a fourth resistor, and a connecting point between the third resistor and the fourth resistor is electrically connected with the non-inverting input end of the comparator;
the switch pins of the first analog switch IC or the second analog switch IC are configured to be electrically connected with a point to be tested on the PCBA, the controller is electrically connected with each switch control end of the first analog switch IC and the second analog switch IC respectively, and the controller is used for sending a trigger signal to the switch control ends so as to control different switch pins of the first analog switch IC and the second analog switch IC to be conducted with output ends of the first analog switch IC and the second analog switch IC;
and the output end of the comparator is electrically connected with the input end of the controller.
Further, in accordance with any one or a combination of multiple technical solutions described above, the test system further includes a first indicator for indicating that the test is passed and a second indicator for indicating that the test is failed, where the first indicator and the second indicator are electrically connected to the output end of the controller;
if the comparator outputs a high level, the controller controls a second indicator to work; and if the comparator outputs a low level, the controller controls the first indicator to work.
Further, with any one or combination of multiple technical solutions, the first indicator is a first LED indicator, the second indicator is a second LED indicator, and the first LED indicator and the second LED indicator have different colors in working states.
Further, in accordance with any one or a combination of multiple technical solutions, the electronic device further includes a third indicator for indicating a start detection state, wherein the third indicator is electrically connected to an output end of the controller; if the short circuit detection of the test point on the PCBA is started, the controller controls a third indicator to work;
or one end of the first indicator is electrically connected with the controller through a current-limiting resistor, and the other end of the first indicator is grounded; one end of the second indicator is electrically connected with the controller through a current-limiting resistor, and the other end of the second indicator is grounded.
Further, in accordance with any one or a combination of the foregoing technical solutions, an output end of the second analog switch IC is connected to one end of the second resistor, which is grounded, and the second resistor is an adjustable varistor.
Further, in accordance with any one or combination of the preceding claims, the first and/or second analog switch IC is configured with n switch control terminals and 2 n A switch pin.
Further, any one or a combination of the preceding claims configured to couple more than 2 n And carrying out short circuit test on the test points to be tested, wherein the number of the first analog switch ICs and the second analog switch ICs is multiple.
Further, in view of any one or combination of the foregoing technical solutions, the first analog switch IC and the second analog switch IC are RS2551 integrated chips;
or the controller is a single chip microcomputer.
Further, in accordance with any one or a combination of multiple previous claims, an output terminal of the comparator is electrically connected to the power supply through a fifth resistor, and is grounded through a capacitor.
According to another aspect of the present invention, the present invention provides a PCBA short circuit detection system, comprising a display device and the PCBA short circuit detection circuit, wherein the display device is electrically connected to a controller of the detection circuit;
the display device is configured to display a short circuit test result of a point to be tested.
The utility model provides a beneficial effect that technical scheme brought as follows:
a. the PCBA short circuit detection circuit provided by the utility model has simple structure and low cost;
b. in the utility model, the switch pin of the first analog switch IC110 is in one-to-one correspondence with the switch pin of the second analog switch IC120 and is electrically connected, the controller is respectively electrically connected with each switch control end of the first analog switch IC110 and the second analog switch IC120, and the controller controls different switch pins of the first analog switch IC110 and the second analog switch IC120 to be conducted with the output end thereof, all test points are only required to be electrically connected with the switch pins of the first analog switch IC110 or the analog switch IC120 once, the controller controls the test points to be switched until the short circuit detection between all test points on the whole circuit board is completed, the detection speed is high, and the efficiency is high;
c. the third indicator, the first indicator and the second indicator respectively indicate the starting test, the passing test and the failure test, so that the detection process and the detection result are simple and clear;
d. through adjusting the resistance of second resistance, this detection circuitry's detectivity can be nimble, and then improve the degree of accuracy of test.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a PCBA short circuit detection circuit according to an exemplary embodiment of the present invention.
Wherein the reference numerals include: 110-first analog switch IC, 120-second analog switch IC, 200-comparator, 3-controller, 410-first resistor, 420-second resistor, 430-third resistor, 440-fourth resistor, 450-fifth resistor, 460-capacitor, 510-first LED indicator, 520-second LED indicator, 530-third indicator.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
In an embodiment of the present invention, a PCBA short circuit detection circuit is provided for performing a short circuit test on a point to be tested on a PCBA, see fig. 1, the detection circuit includes a first analog switch IC110, a second analog switch IC120, a comparator 200, a controller 300, a power supply, a first indicator, a second indicator, and a third indicator 530. Optionally, the first analog switch IC110 and the second analog switch IC are RS2551 integrated chips; the controller 300 is a single chip microcomputer.
Wherein the first analog switch IC110 and the second analog switch IC120 each have a plurality of switch pins, a switch control terminal and an output terminal, and the first analog switch IC110 and the second analog switch IC120 are connected to the first input terminalThe switch pin of the analog switch IC110 (see CP of U1 in FIG. 1) 1 、CP 2 、CP 3 ……CP x ) And a switch pin of the second analog switch IC120 (see CP of U2 in FIG. 1) 1 、CP 2 、CP 3 ……CP x ) And are in one-to-one correspondence and electrically connected.
The switch pins of the first analog switch IC110 or the second analog switch IC120 are configured to be electrically connected to a point to be tested on the PCBA, the controller 300 is electrically connected to the respective switch control terminals of the first analog switch IC110 and the second analog switch IC120, respectively, and the controller 300 is configured to send a trigger signal to the switch control terminals to control different switch pins of the first analog switch IC110 and the second analog switch IC120 to be conducted with the output terminals thereof.
The output terminal of the first analog switch IC110 is electrically connected to the inverting input terminal of the comparator 200 and passes through a first resistor 410 (see R in FIG. 1) 1 ) Is electrically connected to the power supply and passes through a second resistor 420 (see R in fig. 1) 8 ) Ground, the second resistor 420 (see R in FIG. 1) 8 ) Is an adjustable rheostat. By adjusting the second resistor 420 (see R in FIG. 1) 8 ) The resistance value of the detection circuit can be adjusted, so that the detection sensitivity of the detection circuit can be adjusted, and the accuracy of the test can be improved.
The output terminal of the second analog switch IC120 passes through a third resistor 430 (see R in FIG. 1) 6 ) A fourth resistor 440 (see R in fig. 1) 2 ) Is electrically connected with the power supply and the third resistor 430 (see R in FIG. 1) 6 ) And a fourth resistor 440 (R) 2 ) The connection point therebetween is electrically connected to the non-inverting input terminal of the comparator 200.
The output end of the comparator 200 is electrically connected with the input end of the controller 300; and, the output terminal of the comparator 200 passes through a fifth resistor 450 (see R in fig. 1) 3 ) Is electrically connected to the power supply and is passed through a capacitor 460 (see C in fig. 1) 1 ) And is grounded.
The first indicator is used for indicating that the test is passed, and is specifically a first LED indicator lamp 510, one end of which passes through a current limiting resistor R 4 The output end of the controller 300 is electrically connected, and the other end of the controller is grounded, and if the comparator 200 outputs a low level, the controller 300 controls the first indicator to operate. The second indicator is used for indicating test failure, and is specifically a second LED indicator lamp 520, one end of which passes through a current limiting resistor R 5 And the other end of the controller 300 is grounded, and if the comparator 200 outputs a high level, the controller 300 controls the second indicator to operate. The third indicator 530 is used for indicating a start detection state, and is specifically a third LED indicator lamp, one end of which passes through a current limiting resistor R 7 And is electrically connected to the output terminal of the controller 300, and if the short circuit detection of the test point on the PCBA is started, the controller 300 controls the third indicator 530 to operate. The utility model discloses in, first LED pilot lamp 510, second LED pilot lamp 520 and third LED pilot lamp are different at the luminous colour of during operation. The first indicator, the second indicator and the third indicator may also be other indicating devices for indicating that the test is passed or failed, such as an audio prompt device or an audible and visual prompt device.
For a PCBA to be tested with X test points, when the PCBA is not tested, the controller 300 controls the first LED indicator lamp 510, the second LED indicator lamp 520, and the third LED indicator lamp to be turned off. During testing, all the test points are electrically connected with the switch pins of the first analog switch IC110 or the second analog switch IC120 in a one-to-one correspondence manner only once, so that the test is started, and the controller 300 controls the third LED indicator light to be turned on to indicate the start of the test. The controller 300 controls the first analog switch IC110 to turn on the first input test point CP 1 The output terminal of the first analog switch IC110 outputs the signal OUT of the test point 1 Then, the controller 300 controls the second analog switch IC120 to sequentially turn on the remaining test points (CP) 2 ～CP x ) The output terminal of the second analog switch IC120 sequentially outputs the corresponding test signals OUT 2 (ii) a If the first round of detection has no short circuit, the controller 300 controls the first analog switch IC110 to open the second input test point CP 2 Then control againThe second analog switch IC120 turns on the remaining input test points (CP) in sequence 3 ～CP x ) Performing a second round of similar operation; and completing the short circuit test between the X-1 test point and the X test point until the short circuit test between the X test point and the X test point is completed. If there is no short circuit, the controller 300 receives that the output signal of the comparator 200 is always at a low level, and the controller 300 controls the first LED indicator 510 to light up, indicating that the test is passed, that is, the test result is good. If there is a short circuit between two test points during the test, the comparator 200 outputs a high level signal to the controller 300, and after receiving the high level signal, the controller 300 controls the second LED indicator 520 to light up, indicating that the test fails, i.e., the test result is a defective product. The controller 300 (single chip microcomputer) controls the test points to be switched in the whole test process, so that a tester does not need to connect the detection circuit with two of all the test points for many times, and the tester does not need to interpret the test result according to the indicator light for many times, the detection speed is high, the test efficiency is high, and the possibility of missed test and mistest is reduced; and the three indicators respectively indicate the start test, the test pass and the test fail, so that the test result is simple and clear.
For the circuit board to be tested with different numbers of test points, the analog switches with different models and the number of the analog switches can be selected. In one embodiment of the present invention, the first analog switch IC110 and/or the second analog switch IC120 are configured with n switch control terminals and 2 n A switch pin when the detection circuit is configured to pair more than 2 n And performing short-circuit test on the test points to be tested, wherein the number of the first analog switch ICs 110 and the second analog switch ICs 120 is multiple, so that all test points in the PCBA to be tested are connected into the detection circuit.
The embodiment of the utility model provides a PCBA short circuit detection system, including display device and the PCBA short circuit detection circuit, the display device with the detection circuit of the controller 300 electricity connection; the display device is configured to display a short circuit test result of a point to be tested. If a short circuit between two specific test points needs to be detected, the controller 300 can control the display device to display the short circuit point by accessing the display device.
The utility model discloses a test principle does: assuming that the resistance between any two test points is Rx, the resistance R-between the output of the first analog switch IC110 and the output of the second analog switch IC120 is:
the voltage V + at the non-inverting input of the comparator 200 is:
the voltage V-at the inverting input of the comparator 200 is:
by matching the first resistance 410 (R) 1 ) A second resistor 420 (R) 8 ) And a third resistor 430 (R) 6 ) And a fourth resistor 440 (R) 2 ) The voltage value of the inverting input terminal of the comparator 200 is greater than the voltage value of the non-inverting input terminal thereof under the condition of no short circuit, the comparator 200 outputs a low level, and the controller 300 receives the low level output by the comparator 200 and controls the first indicator to work to indicate that the test is passed. When two test points are short-circuited and the resistance value of R-is very small and close to zero, the voltage V-at the inverting input end of the comparator 200 is about 0V, at this time, the voltage V-at the inverting input end of the comparator 200 is smaller than the voltage V + at the non-inverting input end thereof, the comparator outputs a high level, and the controller 300 receives the high level output by the comparator 200 and controls the second indicator to work to indicate that the test fails. In practical application, by adjusting the second resistor 420 (R) 8 ) Can be flexibly adjustedThe detection sensitivity of the detection circuit is improved, and the detection accuracy is improved.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. 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 apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (10)
1. A PCBA short circuit detection circuit is used for carrying out short circuit test on a point to be tested on the PCBA, and comprises a first analog switch IC (110), a second analog switch IC (120), a comparator (200), a controller (300) and a power supply, wherein the first analog switch IC (110) and the second analog switch IC (120) are respectively provided with a plurality of switch pins, a switch control end and an output end, and the switch pins of the first analog switch IC (110) are in one-to-one correspondence with the switch pins of the second analog switch IC (120) and are electrically connected with each other;
the output end of the first analog switch IC (110) is electrically connected with the inverting input end of the comparator (200), and is electrically connected with the power supply through a first resistor (410), and is grounded through a second resistor (420);
the output end of the second analog switch IC (120) is electrically connected with the power supply through a third resistor (430) and a fourth resistor (440), and a connection point between the third resistor (430) and the fourth resistor (440) is electrically connected with the non-inverting input end of the comparator (200);
the switch pins of the first analog switch IC (110) or the second analog switch IC (120) are configured to be electrically connected with points to be tested on the PCBA, the controller (300) is respectively electrically connected with the switch control ends of the first analog switch IC (110) and the second analog switch IC (120), and the controller (300) is used for sending a trigger signal to the switch control ends so as to control different switch pins of the first analog switch IC (110) and the second analog switch IC (120) to be conducted with the output ends of the first analog switch IC (110) and the second analog switch IC (120);
the output end of the comparator (200) is electrically connected with the input end of the controller (300).
2. The PCBA short-circuit detection circuit as recited in claim 1, further comprising a first indicator for indicating that a test passed and a second indicator for indicating that a test failed, the first and second indicators being electrically connected with an output of the controller (300);
if the comparator (200) outputs a high level, the controller (300) controls a second indicator to work; if the comparator (200) outputs a low level, the controller (300) controls the first indicator to work.
3. The PCBA short-circuit detection circuit according to claim 2, characterized in that the first indicator is a first LED indicator lamp (510), the second indicator is a second LED indicator lamp (520), and the first LED indicator lamp (510) and the second LED indicator lamp (520) are different in light emitting color in the working state.
4. The PCBA short-circuit detection circuit as recited in claim 2, further comprising a third indicator for indicating an enable detection state, the third indicator (530) being electrically connected with an output of the controller (300); if short circuit detection of the test points on the PCBA is started, the controller (300) controls a third indicator (530) to work;
or one end of the first indicator is electrically connected with the controller (300) through a current-limiting resistor, and the other end of the first indicator is grounded; one end of the second indicator is electrically connected with the controller (300) through a current-limiting resistor, and the other end of the second indicator is grounded.
5. The PCBA short-circuit detection circuit as recited in claim 1, wherein an output terminal of the second analog switch IC (120) is connected with one end of the second resistor (420) connected to ground, the second resistor (420) being an adjustable resistor.
6. PCBA short-circuit detection circuit according to claim 1, characterised in that the first (110) and/or second (120) analogue switch ICs are configured with n switch control terminals and 2 n A switch pin.
7. The PCBA short circuit detection circuit as recited in claim 6, configured to detect over 2 n And performing short circuit test on the test points, wherein the number of the first analog switch ICs (110) and the second analog switch ICs (120) is multiple.
8. The PCBA short circuit detection circuit as recited in claim 1, wherein the first and second analog switch ICs (110, 2551) are RS2551 integrated chips;
or the controller (300) is a single chip microcomputer.
9. The PCBA short detection circuit as recited in claim 1, wherein the output of the comparator (200) is electrically connected to the power supply through a fifth resistor (450) and to ground through a capacitor (460).
10. A PCBA short circuit detection system, comprising a display device and a PCBA short circuit detection circuit as claimed in any one of claims 1 to 9, the display device being electrically connected to a controller (300) of the detection circuit;
the display device is configured to display a short circuit test result of a point to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223382062.2U CN218866043U (en) | 2022-12-16 | 2022-12-16 | PCBA short circuit detection circuitry and detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223382062.2U CN218866043U (en) | 2022-12-16 | 2022-12-16 | PCBA short circuit detection circuitry and detecting system |
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| CN218866043U true CN218866043U (en) | 2023-04-14 |
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| CN202223382062.2U Active CN218866043U (en) | 2022-12-16 | 2022-12-16 | PCBA short circuit detection circuitry and detecting system |
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