CN207443176U - A kind of LED television backlight tester - Google Patents

Abstract

The utility model is related to a kind of LED television backlight testers, and including babinet and AC/DC switching power circuits, the AC/DC switching power circuits are arranged on the box house；The input terminal of the AC/DC switching power circuits is connected with power supply；Invariable power module is further included, the invariable power module is connected with the output terminal of the AC/DC switching power circuits.The circuit engineering that the utility model uses can be when detecting that lamp bar voltage is low, it is automatic to increase test electric current, when detecting that lamp bar voltage is high, it is automatic to reduce test electric current, so that in the four corner of lamp bar voltage, it can ensure that lamp bar obtains relatively enough brightness and will not damage lamp bead.

Description

A kind of LED television backlight tester

Technical field

The utility model belongs to household appliance technical field, and in particular to a kind of LED television backlight tester.

Background technology

At present, popularized using the liquid crystal TV set of LED backlight, the work of thing followed television maintenance also increasingly increases More, and the failure that the back light system of LCD TV is television set easily sends out position, when repair, it is to have certain risk to tear screen open , it can to greatest extent avoid unnecessary screen of tearing open dangerous the quality not judging backlight lamp bar in the case of tearing screen open. So various LED backlight testers come into being.

Currently marketed LED backlight tester, it is preferred that output current constant current, output voltage adapt to lamp bar electricity automatically Pressure.The test problems of LED television backlight can be solved in certain degree, still, defect is：When the series connection number of lamp bead When different, operating voltage needed for lamp bar is different, the operating voltage that some lamp bars need in below 30V, some lamp bars need Operating voltage up to more than 200V, and tester is constant current output because to take into account high pressure lamp bar is unable to overcurrent damage lamp bead, The current value of constant current cannot design too greatly, so, maximum current also only has tens milliamperes, therefore, bright when testing low-voltage lamp bar Degree will be relatively low too many；And if making low pressure lamp bar enough bright, high pressure lamp bar is easy for overcurrent damage.So existing LED back ofs the body Optical tester cannot take into account the test brightness effect of high-low pressure lamp bar simultaneously.

Utility model content

In view of this, the purpose of the utility model is to overcome the deficiencies in the prior art, a kind of LED television backlight is provided Tester is to solve the problems, such as that existing LED backlight tester cannot take into account the test brightness of high-low pressure lamp bar simultaneously.

In order to achieve the above object, utility model adopts the following technical scheme that：A kind of LED television backlight tester, including： Babinet and AC/DC switching power circuits, the AC/DC switching power circuits are arranged on the box house；The AC/DC switches The input terminal of power circuit is connected with power supply；Further include invariable power module, the invariable power module and the AC/DC Switching Power Supplies The output terminal connection of circuit.

Further, the invariable power module includes DC/DC step-up/step-down circuits, control signal output circuit, invariable power electricity Road and output circuit, the DC/DC step-up/step-down circuits, invariable power circuit and output circuit are sequentially connected, and the AC/DC is opened Powered-down source circuit, DC/DC step-up/step-down circuits, invariable power circuit are connected respectively with the control signal output circuit.

Further, output display circuit, the output terminal of the output display circuit and AC/DC switch electricity are further included Source circuit connects, and the input terminal of the output display circuit is connected with the output circuit.

Further, the babinet is equipped with display screen, and the display screen is connected with the output display circuit.

Further, the display screen is liquid crystal display.

Further, the output terminal of the output circuit is equipped with red-black sheath type banana bin.

Further, the babinet uses PC high flame-retardant materials.

Further, the tank surface is equipped with USB interface.

Further, the DC/DC step-up/step-down circuits include UC3843 chips.

Further, the control signal output circuit includes the first double operational chip；The invariable power circuit includes the Two double operational chips.

The utility model uses above technical scheme, and the attainable advantageous effect of institute includes：

A kind of LED television backlight tester provided by the embodiments of the present application, the circuit engineering that the application uses can be It is automatic to increase test electric current when detecting that lamp bar voltage is low, it is automatic to reduce test when detecting that lamp bar voltage is high Electric current so that in the four corner of lamp bar voltage, can ensure that lamp bar obtains relatively enough brightness and will not damage lamp bead.

Description of the drawings

It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, it can also be obtained according to these attached drawings other attached drawings.

Fig. 1 is a kind of structure diagram of LED television backlight tester of the utility model；

In figure：1st, AC/DC switching power circuits；2nd, power supply；3rd, invariable power module；31st, DC/DC step-up/step-down circuits；32nd, control Signal output apparatus processed；33rd, invariable power circuit；34th, output circuit；35th, output display circuit.

Specific embodiment

It, below will be to the technology of the utility model to make the purpose of this utility model, technical solution and advantage clearer Scheme is described in detail.Obviously, the described embodiments are only a part of the embodiments of the utility model rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not before creative work is made Obtained all other embodiment is put, belongs to the scope that the utility model is protected.

The embodiment of the present application provides a kind of LED television backlight tester, is used in the LED television backlight tester Circuit engineering can be automatic to increase test electric current when detecting that lamp bar voltage is low, detecting that lamp bar voltage is high When, it is automatic to reduce test electric current so that in the four corner of lamp bar voltage, it is relatively enough bright can to ensure that lamp bar obtains It spends and lamp bead will not be damaged.

The specific LED television backlight tester of one provided in the embodiment of the present application is provided below in conjunction with the accompanying drawings.

As shown in Figure 1, LED television backlight tester, including babinet (not shown) and AC/DC switching power circuits 1, the AC/DC switching power circuits 1 are arranged on the box house；The input terminal of AC/DC switching power circuits 1 and power supply 2 Connection；Invariable power module 3 is further included, invariable power module 3 is connected with the output terminal of AC/DC switching power circuits 1.

The operation principle of the application LED television backlight tester is：The mains supply of 85-265V is opened by AC/DC Powered-down source circuit 1 is converted to fixed low pressure voltage stabilizing output；Such as voltage can be set to a certain voltage between 8-32V, such as It can be met the requirements within 12V, output power 24W, such as 12W.Obtained fixed voltage is output to invariable power module, permanent work( Rate module exports fixed power to meet test condition.So no matter lamp bar voltage levels, light source obtain driving power base The problem of this is identical, and brightness is also just essentially the same, solves low pressure lamp bar luminance shortage, and high pressure lamp bar power is bigger than normal.So that Security, practicability substantially get a promotion.The test condition of lamp bar is more nearly actual operating condition, and test result is more accurate Really, reference significance is also just had more.

Optionally, invariable power module 3 includes DC/DC step-up/step-down circuits 31, control signal output circuit 32, invariable power circuit 33 and output circuit 34, the DC/DC step-up/step-down circuits 31, invariable power circuit 33 and output circuit 34 be sequentially connected, institute State AC/DC switching power circuits 1, DC/DC step-up/step-down circuits 31, invariable power circuit 33 respectively with the control signal output circuit 32 connections.

Specifically, the mains supply of 85-265V is converted to the DC voltage-stabilizing of 8-32V by AC/DC switching power circuits 1 Power supply is simultaneously powered to invariable power module 3；Control signal output circuit 32 controls DC/DC step-up/step-down circuits 31 to export suitable test lamp The output current of item, since the input voltage of DC/DC step-up/step-down circuits 31 is constant so that the input of DC/DC step-up/step-down circuits 31 Power in a certain value, such as：10W.It should be noted that the input power of DC/DC step-up/step-down circuits 31 is no more than upper Otherwise the output power for the D.C. regulated power supply stated can cause D.C. regulated power supply cisco unity malfunction.

Optionally, the DC/DC step-up/step-down circuits 31 include UC3843 chips.

Optionally, the control signal output circuit 32 includes the first double operational chip.

Optionally, the invariable power circuit 33 includes the second double operational chip.

In test, lamp bar is connected to the output terminal of output circuit 34, after powering on, AC/DC switching power circuits 1 Fixation low pressure voltage stabilizing be output to DC/DC step-up/step-down circuits 31, the input current of DC/DC step-up/step-down circuits 31 slowly increases, makes The input current that invariable power circuit 33 must be input to slowly increases, and the input current in invariable power circuit 33 is less than rated current When, the second double operational chip feedback signal in invariable power circuit 33 to control signal output circuit 32, control signal output electricity The first double operational chip in road 32 is adjusted the input current of DC/DC step-up/step-down circuits 31, when input current reaches most During big value, the first double operational chip controls reduce input current and make it stable in setting value, form a closed loop control, directly Input current to invariable power circuit 33 reaches setting value so that the power invariability that invariable power circuit 33 exports, invariable power circuit 33 by constant power output to output circuit 34.

For convenience of understanding, the effect of the utility model is illustrated below by way of example：

Assuming that output voltage is 12V, output power 12W, then when input current is more than 1A, in invariable power circuit 33 Second amplifier chip will not output power, when input current be less than 1A when, the second double operational chip feedback signal is to control signal Output circuit 32, the first double operational chip controls input current gradually increase, and when input current is 1A, invariable power circuit 33 is defeated Go out invariable power 12W.

In this way, no matter lamp bar voltage levels, light source obtain driving power it is essentially identical, brightness also just it is essentially the same, The problem of perfection solves low pressure lamp bar luminance shortage, and high pressure lamp bar power is bigger than normal.So that security, practicability are substantially carried It rises.The test condition of lamp bar is more nearly actual operating condition, and test result is more accurate, also just has more reference significance.

It should be noted that the control signal output circuit 32 in the embodiment of the present application can also use microcontroller, herein It does not limit.

Optionally, output display circuit 35 is further included, output terminal and the AC/DC of the output display circuit 35 are switched Power circuit 1 connects, and the input terminal of the output display circuit 35 is connected with the output circuit 34.

Optionally, babinet is equipped with display screen (not shown), and the display screen connects with the output display circuit 35 It connects, display screen is used to show measured power；Display screen uses liquid crystal display.

Optionally, the output terminal of output circuit 34 is equipped with red-black sheath type banana bin (not shown).

Optionally, babinet uses PC high flame-retardant materials.

Optionally, tank surface is equipped with USB interface (not shown).

It should be noted that the DC/DC step-up/step-down circuits 31 provided in the embodiment of the present application, control signal output circuit 32 It can also use other that can realize the chip of its function, not limit herein.

In conclusion the utility model can detect lamp in the circuit engineering that LED television backlight tester uses It is automatic to increase test electric current when voltage is low, it is automatic to reduce test electric current when detecting that lamp bar voltage is high, make It obtains in the four corner of lamp bar voltage, can ensure that lamp bar obtains relatively enough brightness and will not damage lamp bead.

The above is only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to In this, in the technical scope that any one skilled in the art discloses in the utility model, variation can be readily occurred in Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with the power Subject to the protection domain of profit requirement.

Claims (10)

1. a kind of LED television backlight tester, including：Babinet and AC/DC switching power circuits, the AC/DC Switching Power Supplies Circuit is arranged on the box house；The input terminal of the AC/DC switching power circuits is connected with power supply；It is characterized in that, also Including invariable power module, the invariable power module is connected with the output terminal of the AC/DC switching power circuits.

A kind of 2. LED television backlight tester according to claim 1, which is characterized in that the invariable power module bag DC/DC step-up/step-down circuits, control signal output circuit, invariable power circuit and output circuit are included, the DC/DC lifts piezoelectricity Road, invariable power circuit and output circuit are sequentially connected, the AC/DC switching power circuits, DC/DC step-up/step-down circuits, permanent work( Rate circuit is connected respectively with the control signal output circuit.

3. a kind of LED television backlight tester according to claim 2, which is characterized in that further include output display electricity Road, the output terminal of the output display circuit are connected with the AC/DC switching power circuits, the input of the output display circuit End is connected with the output circuit.

4. a kind of LED television backlight tester according to claim 3, which is characterized in that the babinet is equipped with aobvious Display screen, the display screen are connected with the output display circuit.

5. a kind of LED television backlight tester according to claim 4, which is characterized in that the display screen is liquid crystal Display screen.

6. a kind of LED television backlight tester according to claim 2, which is characterized in that the output circuit it is defeated Outlet is equipped with red-black sheath type banana bin.

7. a kind of LED television backlight tester according to claim 1, which is characterized in that the babinet uses PC high Spend fire proofing.

A kind of 8. LED television backlight tester according to any one of claims 1 to 7, which is characterized in that the babinet Surface is equipped with USB interface.

9. a kind of LED television backlight tester according to claim 2, which is characterized in that the DC/DC lifts piezoelectricity Road includes UC3843 chips.

A kind of 10. LED television backlight tester according to claim 2, which is characterized in that the control signal output Circuit includes the first double operational chip；The invariable power circuit includes the second double operational chip.