CN205376097U - Welding short circuit and detection circuitry that opens circuit are shaded - Google Patents
Welding short circuit and detection circuitry that opens circuit are shaded Download PDFInfo
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- CN205376097U CN205376097U CN201521029557.4U CN201521029557U CN205376097U CN 205376097 U CN205376097 U CN 205376097U CN 201521029557 U CN201521029557 U CN 201521029557U CN 205376097 U CN205376097 U CN 205376097U
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Abstract
The utility model discloses a welding short circuit and detection circuitry that opens circuit are shaded, include: LED lamp strip, power module, the first terminal, second terminal, switch unit and little the control unit. The switch unit includes: switch unit output, switching unit control end and switch unit sense terminal, little the control unit includes: little the control unit control end, little the control unit sense terminal and little the control unit output. The switch unit output is connected with the first terminal and second terminal, switches the unit control end and is connected with micro -control system unit control end, and the switch unit sense terminal is connected with little the control unit sense terminal and power module. Little the control unit control end is connected with switching unit control end, and little the control unit sense terminal corresponds with the switch unit sense terminal to be connected, and little the control unit output is connected with power module. The utility model provides a whether welding short circuit and detection circuitry that opens circuit are shaded can detect the welding of being shaded and take place even to weld or two kinds of condition of rosin joint.
Description
Technical field
This utility model relates to a kind of backlight solder shorts and broken circuit detection circuit, particularly relates to a kind of backlight solder shorts for liquid crystal indicator and broken circuit detection circuit.
Background technology
Liquid crystal display (LCD), because of performances such as it are lightweight, volume is little, thickness is thin, is widely used in the terminal presentation facility of various sizes.LCD is passive active display, and namely display screen itself is not luminous, need to realize image by backlight module luminescence and show.Backlight module is mainly made up of light source, light guide plate, optical film sheet etc., and the light source that current backlight module is conventional is light emitting diode (LED), cathode fluorescent tube (CCFL) and electroluminescent (EL).Wherein, LED backlight has low-power consumption, lower calorific value, high brightness, long-life advantage, it has also become the main flow of current LCD backlight.
LED backlight structural representation is as it is shown in figure 1, include LED lamp bar 11, power module 12, input terminal 13 and lead-out terminal 14.When any one input terminal 13 or lead-out terminal 14 rosin joint of backlight, panel there will be obvious bright spot, cause the generation of Lampyridea phenomenon, and detection platform cannot determine the situation of lighting of panel, now such panel will flow into the burning stage, and panel breakage cannot be repaired.When different lead-out terminals 14 occurs even to weld, due to the problem that the difference of LED resistance can cause two LED lamp bar 11 luminance nonuniformities；When input terminal 13 and lead-out terminal 14 occur even to weld, then Lampyridea phenomenon can be caused even to burn out system end.
Therefore, when backlight welding occurs abnormal, how can easily detect that abnormal welding is that even weldering is abnormal or rosin joint is abnormal, become the problem that those skilled in the art need to solve.
Utility model content
In view of this, this utility model provides a kind of backlight solder shorts and broken circuit detection circuit.This backlight solder shorts and broken circuit detection circuit include: LED lamp bar, power module, the first terminal, the second terminal, switch unit and micro-control unit.
Described the first terminal and the second terminal are respectively used to as the input of described LED lamp bar and output electric current.
Described switch unit, including: switch unit outfan, switch unit control end and switch unit test side.
Described micro-control unit, including: micro-control unit controls end, micro-control unit test side and micro-control unit outfan.
Described switch unit outfan is connected with described the first terminal and described second terminal, and described switch unit controls end and is connected with described micro-control unit controls end, and described switch unit test side is connected with described micro-control unit test side and described power module.
Described micro-control unit controls end controls end with described switch unit and is connected, and described micro-control unit test side is corresponding with described switch unit test side to be connected, and described micro-control unit outfan is connected with described power module.
This utility model provides a kind of backlight solder shorts and broken circuit detection circuit, micro-control unit controls end controls end with switch unit and is connected, switch unit test side can be controlled be connected with micro-control unit test side or be connected with power module, so that the second terminal connects with micro-control unit test side, the first terminal is made to connect with micro-control unit test side or connect with power module.When the first terminal and the second terminal connect with micro-control unit test side simultaneously, it is possible to carry out even welding detection；When the first terminal connects with power module, when the second terminal connects with micro-control unit test side, it is possible to carry out rosin joint detection.Utilize this testing circuit can complete the detection to backlight solder shorts and open circuit conditions, it is to avoid when weldering or rosin joint occur to connect in backlight welding, the damage of unrepairable occurs in panel.
Accompanying drawing explanation
Fig. 1 is LED backlight structural representation in prior art；
Fig. 2 be this utility model embodiment one provide a kind of backlight solder shorts and broken circuit detection circuit company weldering testing circuit figure；
Fig. 3 is a kind of backlight solder shorts of providing of this utility model embodiment one and the rosin joint testing circuit figure of broken circuit detection circuit；
Fig. 4 be this utility model embodiment two provide a kind of backlight solder shorts and broken circuit detection circuit company weldering testing circuit figure；
Fig. 5 is a kind of backlight solder shorts of providing of this utility model embodiment two and the rosin joint testing circuit figure of broken circuit detection circuit.
Detailed description of the invention
Understandable for enabling above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with drawings and Examples, this utility model is described further.
It should be noted that elaborate detail in the following description so that fully understanding this utility model.But this utility model can be different from alternate manner described here implement with multiple, and those skilled in the art can do similar popularization when without prejudice to this utility model intension.Therefore this utility model is not by the restriction of following public detailed description of the invention.
Embodiment one
Refer to Fig. 2 and Fig. 3, Fig. 2 is company's weldering testing circuit of a kind of backlight solder shorts of providing of this utility model embodiment one and broken circuit detection circuit, and Fig. 3 is a kind of backlight solder shorts of providing of this utility model embodiment one and the rosin joint testing circuit of broken circuit detection circuit.
Refer to Fig. 2 and Fig. 3, a kind of backlight solder shorts and broken circuit detection circuit that this utility model embodiment one proposes specifically include that LED lamp bar 21, power module 22, the first terminal the 23, second terminal 24, switch unit 25, micro-control unit 26 and detection resistance 27.It should be noted that the quantity of LED lamp bar 21 can be one or more in LED backlight, for purposes of illustration only, this utility model is illustrated for two LED lamp bar 21 in the present embodiment one.
Specifically, the two ends of every LED lamp bar 21 connect the first terminal 23 and the second terminal 24 respectively, and the first terminal 23 and the second terminal 24 are respectively used to input for LED lamp bar 21 and export electric current.Further, the input of each LED lamp bar 21 and a first terminal 23 connect, and the outfan of each LED lamp bar 21 and second terminal 24 connect.The number of the first terminal 23 is identical with the bar number of LED lamp bar 21, and the number of the second terminal 24 is also identical with the bar number of LED lamp bar 21.In the present embodiment one, the number of the first terminal 23 and the second terminal 24 is two.
Specifically, switch unit 25 can be relay, controls end 253 and switch unit test side 254 including switch unit outfan 252, switch unit, and each switch unit also includes at least one switch element 251；Micro-control unit 26 includes micro-control unit controls end 263, micro-control unit test side 264 and micro-control unit outfan 262.
More specifically, micro-control unit outfan 262 is connected with power module 22, control the level output of power module 22.A kind of backlight solder shorts and broken circuit detection circuit include two switch units 25 altogether；Switch unit outfan 252 is connected with the first terminal 23 and the second terminal 24.In switch unit 25, the number of switch element 251 is identical with the number of the first terminal 23 that this switch unit outfan 252 connects and the second terminal 24, and each switch element 251 only connects a first terminal 23 or second terminal 24.
In the present embodiment one, each switch unit outfan 252 connects a first terminal 23 and second terminal 24, therefore comprising two switch elements 251 in each switch unit 25, each switch element 251 connects a first terminal 23 or connects second terminal 24.
More specifically, switch unit test side 254 is connected with micro-control unit test side 264 and power module 22.Switch unit test side 254 includes multiple first pin 2541 and multiple second pin 2542, each switch element 251 at least one first pin 2541 corresponding, each switch element 251 at least one second pin 2542 corresponding, each first pin 2541 and each second pin 2542 be a corresponding switch element 251 only.Micro-control unit test side 264 includes multiple 3rd pin 2641, and the number of the 3rd pin 2641 is identical with the total number of switch element 251.First pin 2541 is connected with power module 22, corresponding to being connected with power module 22 after multiple first pin 2541 parallel connections of same switch element 251；Second pin 2542 is connected with the 3rd pin 2641, corresponding to being connected with the 3rd pin 2641 after multiple second pin 2542 parallel connections of same switch element 251.Changeable the second pin 2542 being connected to the first corresponding pin 2541 or correspondence of each switch element 251.Micro-control unit test side 264 is for output or receives detection level.
In the present embodiment one, each switch unit test side 254 includes four the first pins 2541 and two the second pins 2542, wherein corresponding two the first pins 2541 of each switch element 251 corresponding second pin 2542, an and each first pin 2541 and each second pin 2542 only corresponding switch element 251.Micro-control unit test side 264 includes four the 3rd pins 2641.Corresponding to being connected with power module 22 after two the first pin 2541 parallel connections of same switch element 251；Second pin 2542 corresponding to same switch element 251 is connected with the 3rd pin 2641 respectively.
More specifically, micro-control unit controls end 263 includes multiple 4th pin 2631, switch unit controls end 253 and includes the 5th pin 2531, and each switch unit to control the number of the 5th pin 2531 that end 253 comprises identical with the number comprising switch element 251.Each 5th pin 2531 is connected with the 4th pin 2631.Switch unit controls end 253 and is connected to the first pin 2541 or the second pin 2542 of correspondence for controlling switch element 251；Micro-control unit controls end 263 is used for controlling switch unit and controls end 253.
In the present embodiment one, each switch unit 25 comprises two switch elements 251, and therefore each switch unit control end 253 includes two the 5th pins 2531.Micro-control unit controls end 263 includes two the 4th pins 2631, and each 5th pin 2531 is connected with the 4th pin 2631.
More specifically, detection resistance 27 is arranged between micro-control unit test side 264 and the second pin 2542, can by the voltage signal of micro-control unit test side 264 perception for sensed current signal is converted to.Further, detection resistance 27 one end is connected with the line between the second pin 2542 and the 3rd pin 2641, detects resistance 27 other end ground connection.
Further, changeable the second pin 2542 being connected to the first corresponding pin 2541 or correspondence of each switch element 251；Switch unit controls end 253 and is connected to the first pin 2541 or the second pin 2542 of correspondence for controlling switch element 251；Micro-control unit controls end 263 is used for controlling switch unit and controls end 253；Micro-control unit test side 264 is for output or receives detection level；Micro-control unit outfan 262 is used for controlling power module 22 output level.
In this utility model embodiment one, when LED backlight is carried out even weldering detection, please continue to refer to Fig. 2.Micro-control unit controls end 263 controls switch unit and controls end 253, thus controlling each switch element 251 to be all connected to the second pin 2542 of correspondence.And then, each the first terminal 23 all connects with the 3rd corresponding pin 2641 with each second terminal 24.Now, one the 3rd pin 2641 of micro-control unit test side 264 exports high level, if other the 3rd pins 2641 receive high level, then there is even weldering with the first terminal 23 corresponding to the 3rd pin 2641 receiving high level or the second terminal 24 in the 3rd pin 2641 that output high level is described.3rd pin 2641 of micro-control unit test side 264 is sequentially output high level, and detection LED backlight even welds situation.
It should be noted that when LED backlight carries out even weldering detection, what the 3rd pin 2641 exported high value is between 1.8V and 3.8V, it is preferable that the high value of the 3rd pin 2641 output is 3.3V.
In this utility model embodiment one, when LED backlight is carried out rosin joint detection, please continue to refer to Fig. 3.Micro-control unit controls end 263 controls switch unit and controls end 253, thus the switch element 251 controlling to be connected with the first terminal 23 is all connected to the second pin 2541, thus the switch element 251 controlling to connect with the second terminal 24 is all connected to the second corresponding pin 2542.And then, each the first terminal 23 connects with power module 22, and each second terminal 24 all connects with the 3rd corresponding pin 2641.Now, micro-control unit outfan 262 controls power module 22 and exports high level, if the 3rd pin 2641 being connected with the second pin 2542 does not receive high level, then illustrate not receive some in second terminal 24 corresponding to the 3rd pin 2641 of high level and the first terminal 23 that connects with this second terminal 24 and rosin joint occurs.
It should be noted that when LED backlight carries out rosin joint detection, the high level of power module 22 output is determined by the number of the comprised LED of LED lamp bar 21, it is preferable that needed for each LED, high value is 3V.
In the present embodiment one, micro-control unit controls end 263 comprises two the 4th pins 2631, controls a switch unit 25 of the first terminal 23 connection and a switch unit 25 of the second terminal 24 connection respectively.When the first terminal and the second terminal connect with micro-control unit test side simultaneously, it is possible to carry out even welding detection；When the first terminal connects with power module, when the second terminal connects with micro-control unit test side, it is possible to carry out rosin joint detection.Utilize this testing circuit can complete the detection to backlight solder shorts and open circuit conditions, it is to avoid when weldering or rosin joint occur to connect in backlight welding, the damage of unrepairable occurs in panel.
Embodiment two
Refer to Fig. 4 and Fig. 5, Fig. 4 be this utility model embodiment two provide a kind of backlight solder shorts and broken circuit detection circuit company weldering testing circuit；Fig. 5 is a kind of backlight solder shorts of providing of this utility model embodiment two and the rosin joint testing circuit of broken circuit detection circuit.A kind of backlight solder shorts and broken circuit detection circuit that the present embodiment two proposes are similar to the structure of a kind of backlight solder shorts provided in embodiment one and broken circuit detection circuit, do not repeat them here, highlight both and distinguish part.For purposes of illustration only, this utility model is still illustrated by we for two LED lamp bar 21 in the present embodiment two.
Please continue to refer to Fig. 4 and Fig. 5, being different from embodiment one, a kind of backlight solder shorts and broken circuit detection circuit include four switch units 25 altogether.Each switch unit outfan 252 is connected with a first terminal 23 or second terminal 24.Each switch unit controls end 253 and includes the 5th pin 2531, each switch unit test side 254 includes two the first pins 2541 and two the second pins 2542, wherein it is connected with power module 22 after corresponding two the first pin 2541 parallel connections of each switch element 251, and is connected with the 3rd pin 2641 after corresponding two the second pin 2542 parallel connections of each switch element 251.Micro-control unit controls end 263 includes four the 4th pins 2631, and micro-control unit test side 264 includes four the 3rd pins 2641.
It should be noted that, the number of switch unit 25 is less than or equal to the summation of the first terminal 23 and the second terminal 24 number, each the first terminal 23 and each second terminal 24 are connected with switch unit 25, and the concrete number of switch unit 25 is not limited by this utility model.First pin 2541 corresponding with each switch element 251 is at least one, second pin 2542 corresponding with each switch element 251 is at least one, and the number of the first pin 2541 corresponding to switch element 251 and the second pin 2542 is not limited by this utility model.Micro-control unit controls end 263 is used for controlling switch unit and controls end 253, thus controlling switch element 251 to be connected to the first pin 2541 or the second pin 2542 of correspondence, as long as the number of the 4th pin 2631 can control the connection status of switch element 251 according to practical situation, the concrete number of the 4th pin 2631 is not limited by this utility model.
Please continue to refer to Fig. 4 and Fig. 5, further, the input of every LED lamp bar 21 and a first terminal 23 connect, and the outfan of every LED lamp bar 21 and second terminal 24 connect.Each switch unit 25 comprises a switch element 251, each switch element 251 and a first terminal 23 and connects one to one or connect one to one with second terminal 24.It is connected with power module 22 after two the first pin 2541 parallel connections corresponding with each switch element 251；It is connected with the 3rd pin 2641 respectively after two the second pin 2542 parallel connections corresponding with each switch element.Each 5th pin 2531 is connected with the 4th pin 2631；Micro-control unit outfan 262 is connected with power module 22.Detection resistance 27 is arranged between described micro-control unit test side 264 and described second pin 2542, and specifically, detection resistance 27 one end is connected with the line between the second pin 2542 and the 3rd pin 2641, detects resistance 27 other end ground connection.
It should be noted that, each switch unit 25 comprises at least one switch element 251, the number of each comprised switch element of switch unit 25 251 is identical with the number of the first terminal 23 connected and the second terminal 24, this utility model to each comprised switch element of switch unit 25 251 concrete number do not limit, similarly, switch unit outfan 253 is connected by this utility model the first terminal 23 and the concrete number of the second terminal 24 do not limit.
A kind of backlight solder shorts and broken circuit detection circuit that the present embodiment two proposes refer to Fig. 4 when carrying out even weldering detection, refer to Fig. 5 when carrying out rosin joint detection, and it is identical that concrete detection process detects process with embodiment one, does not repeat them here.
In the present embodiment two, micro-control unit controls end 263 comprises four the 4th pins 2631, controls four switch units 25 respectively.When the first terminal 23 connects with micro-control unit test side 264 with the second terminal 24 simultaneously, it is possible to carry out even welding detection；When the first terminal 23 connects with power module 22, when the second terminal 24 connects with micro-control unit test side 264, it is possible to carry out rosin joint detection.Backlight solder shorts and open circuit are detected more flexible by this embodiment two.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, it is impossible to assert that of the present utility model being embodied as is confined to these explanations.For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, it is also possible to make some simple deduction or replace, protection domain of the present utility model all should be considered as belonging to.
Claims (10)
1. backlight solder shorts and a broken circuit detection circuit, including:
LED lamp bar；
Power module；
The first terminal, the second terminal, be respectively used to as the input of described LED lamp bar and output electric current；
It is characterized in that, also include:
Switch unit, including: switch unit outfan, switch unit control end and switch unit test side；
Micro-control unit, including: micro-control unit controls end, micro-control unit test side and micro-control unit outfan；
Described switch unit outfan is connected with described the first terminal and described second terminal, and described switch unit controls end and is connected with described micro-control unit controls end, and described switch unit test side is connected with described micro-control unit test side and described power module；
Described micro-control unit controls end controls end with described switch unit and is connected, and described micro-control unit test side is corresponding with described switch unit test side to be connected, and described micro-control unit outfan is connected with described power module.
2. a kind of backlight solder shorts according to claim 1 and broken circuit detection circuit, it is characterised in that each described switch unit also includes at least one switch element.
3. a kind of backlight solder shorts according to claim 2 and broken circuit detection circuit, it is characterised in that each described switch element only connects a described the first terminal or described second terminal.
4. a kind of backlight solder shorts according to claim 2 and broken circuit detection circuit, it is characterised in that described switch unit test side includes multiple first pin and multiple second pin, and described micro-control unit test side includes multiple 3rd pin；
Described first pin is connected with described power module, and described second pin is connected with described 3rd pin.
5. a kind of backlight solder shorts according to claim 4 and broken circuit detection circuit, it is characterised in that each described switch element at least one described first pin corresponding, each described switch element at least one described second pin corresponding；
Each described first pin and each described second pin be a corresponding switch element only.
6. a kind of backlight solder shorts according to claim 5 and broken circuit detection circuit, it is characterised in that be connected corresponding to the 3rd pin described with after multiple described second pins in parallel of same described switch element；Corresponding to being connected with described power module after multiple described first pins in parallel of same described switch element.
7. a kind of backlight solder shorts according to claim 2 and broken circuit detection circuit, it is characterised in that described micro-control unit controls end includes multiple 4th pin；
Described switch unit controls end and includes the 5th pin, and the number that each described switch unit controls described 5th pin that end comprises is identical with the number of described switch element；
Each described 5th pin and described 4th pin connect.
8. a kind of backlight solder shorts according to claim 5 and broken circuit detection circuit, it is characterised in that
Described switch unit controls end and is connected to the first pin or second pin of correspondence for controlling described switch element；
Described micro-control unit controls end is used for controlling described switch unit and controls end；
Described micro-control unit test side is for output or receives detection level；
Described micro-control unit outfan is used for controlling described power module output level.
9. a kind of backlight solder shorts according to claim 4 and broken circuit detection circuit, it is characterised in that
Also include detection resistance；Described detection resistance is arranged between described micro-control unit test side and described second pin；
Described detection resistance can by the voltage signal of described micro-control unit test side perception for sensed current signal being converted to.
10. a kind of backlight solder shorts according to claim 1 and broken circuit detection circuit, it is characterised in that described switch unit is relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521029557.4U CN205376097U (en) | 2015-12-10 | 2015-12-10 | Welding short circuit and detection circuitry that opens circuit are shaded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521029557.4U CN205376097U (en) | 2015-12-10 | 2015-12-10 | Welding short circuit and detection circuitry that opens circuit are shaded |
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| Publication Number | Publication Date |
|---|---|
| CN205376097U true CN205376097U (en) | 2016-07-06 |
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| CN201521029557.4U Active CN205376097U (en) | 2015-12-10 | 2015-12-10 | Welding short circuit and detection circuitry that opens circuit are shaded |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272818A (en) * | 2020-03-02 | 2020-06-12 | 深圳市金锐显数码科技有限公司 | Circuit board soldering tin detection method and device |
-
2015
- 2015-12-10 CN CN201521029557.4U patent/CN205376097U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272818A (en) * | 2020-03-02 | 2020-06-12 | 深圳市金锐显数码科技有限公司 | Circuit board soldering tin detection method and device |
| CN111272818B (en) * | 2020-03-02 | 2022-12-02 | 深圳市金锐显数码科技有限公司 | Circuit board soldering tin detection method and device |
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