CN212694001U

CN212694001U - Open circuit detection circuit and open circuit detection device

Info

Publication number: CN212694001U
Application number: CN202021263706.4U
Authority: CN
Inventors: 李鹏程; 陈湘娜
Original assignee: China Display Optoelectronics Technology Huizhou Co Ltd
Current assignee: China Display Optoelectronics Technology Huizhou Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-03-12
Anticipated expiration: 2030-06-30

Abstract

The utility model provides an open circuit detection circuit and an open circuit detection device, wherein the open circuit detection circuit comprises a power input end, a test signal output end, a plurality of first resistance modules and a plurality of first test signal lines which are in short circuit connection; one end of each first test signal line is connected with the power supply input end through one first resistance module, and the other end of each first test signal line is connected with the test signal output end through one first resistance module; the test signal output end is grounded through the first resistor module. The technical scheme of the utility model, it detects to open a way to the circuit to aim at solving the mode that adopts to concatenate LED, leads to the too high technical problem of test cost.

Description

Open circuit detection circuit and open circuit detection device

Technical Field

The utility model relates to a test technical field, in particular to detection circuitry opens a way and detection device opens a way.

Background

Before consumer electronic products are sold out of factories, open-short circuit detection needs to be carried out on circuits of the electronic products. Taking the display industry as an example, whether the display device can normally display the picture is an intuitive judgment for judging whether the display device is normal, however, some lines on the whole machine of the client need to be reserved on the display module, and the reserved lines cannot judge whether the display module is open-circuited or not through display. At present, in order to prevent the display device with open circuit on the line from flowing into the client, manufacturers mainly confirm the open circuit condition of the line by connecting the LED lamps on the reserved line in series, but there are the following problems in the open circuit condition of the line by connecting the LED lamps on the line in series:

1. the number of the LED lamps is increased along with the increase of the number of lines to be tested, so that the test cost is increased;

2. once the number of the LED lamps is too large, production line staff are easy to fatigue, and detection errors are caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides an open a way detection circuitry and detection device opens a way aims at solving and adopts the mode of concatenating LED to open a way the circuit and detect, leads to the too high technical problem of test cost.

In order to achieve the above object, the present invention provides an open circuit detection circuit, which includes a power input terminal, a test signal output terminal, a plurality of first resistance modules and a plurality of first test signal lines in short circuit;

one end of each first test signal line is connected with the power supply input end through one first resistance module, and the other end of each first test signal line is connected with the test signal output end through one first resistance module;

the test signal output end is grounded through the first resistor module.

Optionally, the resistances of the plurality of first resistance modules are different from each other.

Optionally, the open circuit detection circuit further includes a power module and a plurality of second test signal lines connected in series;

one end of the second test signal line arranged at the head position is connected with the power supply module, and one end of the second test signal line arranged at the tail position is the power supply input end.

Optionally, the open circuit detection circuit further comprises a plurality of second resistance modules;

every two adjacent second test signal lines are connected through one second resistance module.

Optionally, the resistances of the plurality of second resistance modules are the same.

Optionally, the open circuit detection circuit further includes a flexible circuit board, and the plurality of short-circuited first test signal lines and the plurality of series-connected second test signal lines are disposed on the flexible circuit board.

Optionally, the open circuit detection circuit further comprises an indicator light module;

the test signal output end is grounded through the first resistor module and the indicator light module.

In order to achieve the above object, the present invention further provides an open circuit detection device, which includes the open circuit detection circuit according to any one of the above aspects.

Optionally, the open circuit detection device further comprises a signal detection device;

and the input end of the signal detection device is connected with the test signal output end of the open-circuit detection circuit.

Optionally, the signal detection device includes a current detection device, and a detection end of the current detection device is connected to the test signal output end;

and/or the signal detection device comprises a voltage detection device, and the detection end of the voltage detection device is connected with the test signal output end.

The technical scheme of the utility model, link together many first test signal line through setting up first resistance module, when the open circuit condition appeared in first test signal line, the equivalent resistance of circuit can change thereupon, and the voltage and the electric current of test signal output end also can change thereupon, and the tester is through the voltage and/or the electric current that detect test signal output end, can accurately judge whether open a way of first test signal line, so sets up, can effectively reduce the test cost of test signal line.

Drawings

In order to more clearly illustrate the embodiments of the present invention 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 of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a block diagram of an embodiment of an open circuit detection circuit according to the present invention;

fig. 2 is a schematic circuit diagram of an exemplary embodiment of the open circuit detection circuit of the present invention;

fig. 3 is a block diagram of another embodiment of the open circuit detection circuit of the present invention;

fig. 4 is a block diagram of another embodiment of the open circuit detection circuit of the present invention;

fig. 5 is a schematic circuit diagram of another exemplary embodiment of the open circuit detection circuit of the present invention;

fig. 6 is a block diagram of another embodiment of the open circuit detection circuit of the present invention.

The reference numbers illustrate:

100	power supply module	101	First resistance module
				1021～102M	Multiple first test signal lines	103	Second resistance module
1041～104N	Multiple second test signal lines	105	Indicator light module
				TEST	Test signal output terminal	GND	Ground

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely 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 in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Fig. 1 is a block diagram of an embodiment of the open circuit detection circuit of the present invention.

Referring to fig. 1, the open circuit detection circuit includes a power input terminal VDD for supplying power, a TEST signal output terminal TEST, a plurality of first resistance modules 101, and a plurality of first TEST signal lines 1021 to 102M short-circuited therewith; one end of each first TEST signal line is connected with the power supply input end VDD through a first resistance module 101, and the other end of each first TEST signal line is connected with the TEST signal output end TEST through a first resistance module 101; and the TEST signal output terminal TEST is grounded through a first resistor module 101.

The TEST signal output terminal TEST is used for connecting with a signal detection device having a current detection function and/or a voltage detection function.

The first resistor module 101 may be formed by a single resistor, may be formed by connecting a plurality of resistors in series, or may be formed by connecting a plurality of resistors in parallel.

The open circuit detection circuit further comprises a flexible circuit board, the plurality of first test signal lines 1021-102M can be arranged on the flexible circuit board, the plurality of first test signal lines 1021-102M are signal lines in the same network, namely the plurality of first test signal lines 1021-102M are in short circuit together, as shown in fig. 1, A1-AM and B1-BM are pins at two ends of the plurality of first test signal lines 1021-102M, and A1-AM and B1-BM are in short circuit together. As shown in fig. 1, a pin a1 of the first TEST signal line 1021 is connected to the power input terminal VDD through one first resistor module 101, and a pin B1 of the first TEST signal line 1021 is connected to the TEST signal output terminal TEST through the other first resistor module 101.

The working principle of the open circuit detection circuit is as follows: the voltage and/or current of the TEST signal output terminal TEST are detected by a signal detection device. If the circuit of each first TEST signal line and the circuits at two sides of the pin of the first TEST signal line are not open, the current of the TEST signal output terminal TEST is equal to the ratio of the voltage of the power input terminal VDD to the equivalent resistance of the whole circuit, and the voltage of the TEST signal output terminal TEST is equal to the voltage to ground of the TEST signal output terminal TEST. If one or more of the first TEST signal lines are open, the equivalent resistance of the whole circuit increases, and correspondingly, the current of the TEST signal output terminal TEST decreases, and the voltage of the TEST signal output terminal TEST also decreases. The tester can judge whether the first TEST signal line is open-circuited by detecting the voltage and/or the current of the TEST signal output terminal TEST. For example, referring to fig. 2, it is assumed that the flexible circuit board includes 3 first

test signal lines

1021, 1022, and 1023 thereon; the first pin a1 of the first TEST signal line 1021 is connected to the power input terminal VDD through a first resistor R1, and the second pin B1 of the first TEST signal line 1021 is connected to the TEST signal output terminal TEST through a second resistor R2; the first pin a2 of the first TEST signal line 1022 is connected to the power input terminal VDD through the third resistor R3, and the second pin B2 of the first TEST signal line 1022 is connected to the TEST signal output terminal TEST through the fourth resistor R4; the first pin a3 of the first TEST signal line 1023 is connected to the power input terminal VDD via a fifth resistor R5, and the second pin B3 of the first TEST signal line 1023 is connected to the TEST signal output terminal TEST via a sixth resistor R6; and, the TEST signal output terminal TEST is grounded through the seventh resistor R7. Setting the equivalent resistance of the whole circuit to Ra under normal conditions and the voltage of the power input terminal VDD to U, the current I of the TEST signal output terminal TEST is U/Ra under normal conditions, and the voltage U1 of the TEST signal output terminal TEST is I R7 is U R7/Ra under normal conditions. If the first TEST signal line 1021 is open, the equivalent resistance of the circuit increases from Ra to Rb, and accordingly, the current I of the TEST signal output terminal TEST decreases, and the voltage of the TEST signal output terminal TEST decreases, which is equal to U1U R7/Rb. In other embodiments, the TEST signal output terminal TEST may be further disposed between the first resistor R1 and the pin a1, or between the third resistor R3 and the pin a2, or between the fifth resistor R5 and the pin A3; and the resistance adjusting circuit can be arranged between the pin B1 and the second resistor R2, between the pin B2 and the fourth resistor R4, or between the pin B3 and the sixth resistor R6, and can be arranged according to requirements.

Optionally, in an embodiment, the resistance values of the first resistance modules 101 are set to different resistance values, then, the positions where the open circuits occur are different, the equivalent resistances of the circuits are different, and the tester can accurately position the first TEST signal line where the open circuit occurs according to the specific current value and/or voltage value of the TEST signal output terminal TEST, which is beneficial for the tester to quickly find the abnormal signal line, and improves the working efficiency of the tester. In addition, two pins of the first test signal line are respectively provided with a first resistance module 101, which is beneficial for a tester to accurately position a specific open circuit position of the first test signal line with an open circuit.

The technical scheme of the utility model, link together many first TEST signal line 1021 ~ 102M through setting up first resistance module 101, when the open circuit condition appears in first TEST signal line, the equivalent resistance of circuit can change thereupon, TEST signal output part TEST's voltage and electric current also can change thereupon, the tester is through the voltage and/or the electric current that detect TEST signal output part TEST, can accurately judge whether open a way first TEST signal line, so set up, can effectively reduce the TEST cost to first TEST signal line.

Optionally, referring to fig. 3, in an embodiment, the open circuit detection circuit further includes a power module 100 and a plurality of second test signal lines 1041 to 104N connected in series;

one end of the second test signal line 1041 disposed at the head is connected to the power module 100, and one end of the second test signal line 104N disposed at the last is the power input terminal VDD, that is, one end of the second test signal line 104N disposed at the last is connected to one end of the first test signal lines 1021 to 102M through the first resistance modules 101.

The short-circuited first TEST signal lines and the series second TEST signal lines are arranged on the flexible circuit board, and the TEST signal output end TEST can be used for detecting the current and the voltage of any position in the circuit.

In this embodiment, the second test signal lines 1041 to 104N are signal lines of different networks, i.e. independent signal lines without short-circuited signal lines. In the present application, a plurality of originally independent second TEST signal lines 1041 to 104N are connected together, and whether the second TEST signal lines 1041 to 104N are open-circuited or not is determined by detecting the voltage and/or current of the TEST signal output terminal TEST. Of course, whether the first TEST signal lines 1021-102M are open-circuited can be determined by detecting the voltage and/or current of the TEST signal output terminal TEST, so as to detect the open-circuit conditions of the signal lines of the same network and the signal lines of different networks. Specifically, because the first TEST signal line or the second TEST signal line is open, the equivalent resistance of the whole circuit changes, correspondingly, the voltage and the current of the TEST signal output terminal TEST also change correspondingly, and a tester can judge whether the first TEST signal line or the second TEST signal line is open or not by detecting the voltage and/or the current of the TEST signal output terminal TEST. For example, as shown in fig. 3, if the third second TEST signal line 1043 is open, the voltage at the TEST signal output terminal TEST is 0V, and the current is 0A; if the line on the side of the first pin a1 of the first TEST signal line 1021 is open, the equivalent resistance of the circuit increases, the current at the TEST signal output terminal TEST decreases, and the voltage at the TEST signal output terminal TEST decreases accordingly.

Optionally, referring to fig. 4, in an embodiment, the open circuit detection circuit further includes a plurality of second resistance modules 103; every two adjacent second test signal lines are connected through a second resistance module 103. The second resistor module 103 may be formed by a single resistor, may be formed by connecting a plurality of resistors in series, or may be formed by connecting a plurality of resistors in parallel.

In this embodiment, the second resistance module 103 is used to connect two adjacent second test signal lines, so that the technical scheme of this embodiment can test whether each second test signal line in different networks is open-circuited or not, and can also test whether each second test signal line is short-circuited or not; it is also possible to test whether there is an open circuit in the first test signal line in the same network. Specifically, because the first TEST signal line or the second TEST signal line is open or the second TEST signal line is short, the equivalent resistance of the whole circuit changes, correspondingly, the voltage and the current of the TEST signal output terminal TEST also change correspondingly, and a tester can judge whether the first TEST signal line is open or not or whether the second TEST signal line is open or short by detecting the voltage and/or the current of the TEST signal output terminal TEST. For example, referring to fig. 5, 1041 to 1046 are set as a plurality of second TEST signal lines of different nets, and 1021 to 1023 are set as a plurality of first TEST signal lines short-circuited in the same net, connecting the TEST signal output terminal TEST with the pin D6 of the second TEST signal line 1046. Setting the voltage provided by the power module 100 to be 5V, and the equivalent resistance of the circuit to be 9 Ω, then, the voltage of the TEST signal output terminal TEST under the normal condition is 1.667V, and the current is 0.556A; if one or more lines of the second TEST signal lines 1041 to 1045 are open, the current of the TEST signal output terminal TEST is 0A, and the voltage is 0V; if there is a short circuit in the second TEST signal line, for example, the second TEST signal lines 1041 and 1042 are shorted together, then the equivalent resistance of the circuit becomes smaller, the current of the TEST signal output terminal TEST increases, and the voltage rises; if one circuit of the first TEST signal lines 1021-1023 is open-circuited, the equivalent resistance of the circuit is increased by 0.5 omega, the current is reduced by 0.029A, and the voltage of the TEST signal output terminal TEST is increased by 0.175V; if two circuits of the first TEST signal lines 1021-1023 are open-circuited, the equivalent resistance of the circuit is increased by 2 omega, the current is reduced by 0.101A, and the voltage of a TEST signal output terminal TEST is increased by 0.606V; if the three circuits of the first TEST signal lines 1021-1023 are open-circuited, the circuit current is 0A, and the voltage of the TEST signal output terminal TEST is 5V.

Alternatively, for the case that only the test circuit needs to be tested whether there is an open circuit or a short circuit, the resistance values of the second resistance modules 103 may be set to be the same. In other embodiments, the resistance values of the second resistor modules 103 may be set to be different from each other, so that the second test signal line with the short circuit condition can be accurately positioned by a tester. It is understood that the position of the TEST signal output terminal TEST can be set according to actual needs, and is not limited herein.

Optionally, referring to fig. 6, in an embodiment, the open circuit detection circuit further comprises an indicator light module 105; the TEST signal output terminal TEST is grounded via a first resistor module 101 and the indicator light module 105.

In this embodiment, whether the open circuit condition occurs in the circuit is indicated by setting the indicator light module 105, so that developers can preliminarily know the operating conditions of the signal lines. For example, if any one of the second test signal lines is open or all of the first test signal lines are open, the indicator light module 105 is not lit.

The utility model also provides an open circuit detection device, including the open circuit detection circuit as above, the detailed structure of this open circuit detection circuit can refer to above-mentioned embodiment, and the description is omitted here; it can be understood that, because the utility model discloses an open a way among the detection device and used above-mentioned detection circuit that opens a way, consequently, the utility model discloses an open a way detection device's embodiment includes the whole technical scheme of the whole embodiments of above-mentioned detection circuit that opens a way, and the technological effect that reaches is also identical, no longer gives details here.

Optionally, the open circuit detection device further comprises a signal detection device; the input end of the signal detection device is connected with the TEST signal output end TEST of the open circuit detection circuit. The signal detection device is used for detecting the voltage and/or the current of the TEST signal output terminal TEST so as to enable a tester to determine whether the TEST signal line is open-circuited or short-circuited according to the detected voltage and/or current.

In one embodiment, the signal detection device is a current detection device; the detection end of the current detection device is connected with the TEST signal output end TEST to detect the current of the TEST signal output end TEST, and the current detection device can be an ammeter or other devices capable of detecting the current.

In one embodiment, the signal detection device is a voltage detection device; the detection end of the voltage detection device is connected with the TEST signal output end TEST to detect the voltage of the TEST signal output end TEST, and the voltage detection device can be a voltmeter or other devices capable of detecting the voltage.

In one embodiment, the signal detection device includes a current detection device and a voltage detection device, and a detection terminal of the current detection device is connected to the TEST signal output terminal TEST to detect a current of the TEST signal output terminal TEST; and the detection end of the voltage detection device is connected with the TEST signal output end TEST so as to detect the voltage of the TEST signal output end TEST.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An open circuit detection circuit is characterized by comprising a power supply input end, a test signal output end, a plurality of first resistance modules and a plurality of first test signal lines in short circuit;

the test signal output end is grounded through the first resistor module.

2. The open circuit detection circuit of claim 1, wherein the first resistor modules have different resistances.

3. The open circuit detection circuit of claim 1, further comprising a power module and a plurality of second test signal lines connected in series;

4. The open circuit detection circuit of claim 3, further comprising a plurality of second resistance modules;

5. The open circuit detection circuit of claim 4, wherein the plurality of second resistor modules have the same resistance.

6. The open circuit detection circuit of claim 3, further comprising a flexible circuit board, wherein the plurality of shorted first test signal lines and the plurality of series connected second test signal lines are disposed on the flexible circuit board.

7. The open circuit detection circuit of any of claims 1-6, wherein the open circuit detection circuit further comprises an indicator light module;

8. An open circuit detection device, characterized in that it comprises an open circuit detection circuit according to any one of claims 1-7.

9. The open circuit detection device according to claim 8, wherein the open circuit detection device further comprises a signal detection device;

10. The open circuit detection device according to claim 9, wherein the signal detection device comprises a current detection device, a detection terminal of the current detection device being connected to the test signal output terminal;