CN202421370U - Aging test circuit for backlight driver board - Google Patents
Aging test circuit for backlight driver board Download PDFInfo
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- CN202421370U CN202421370U CN2011205414838U CN201120541483U CN202421370U CN 202421370 U CN202421370 U CN 202421370U CN 2011205414838 U CN2011205414838 U CN 2011205414838U CN 201120541483 U CN201120541483 U CN 201120541483U CN 202421370 U CN202421370 U CN 202421370U
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Abstract
The utility model discloses an aging test circuit for a backlight driver board. The aging test circuit comprises a regulation circuit, a driving circuit, a constant current power circuit and a starting circuit, wherein the input end of the regulation circuit is connected to an external test power supply, and the output end of the regulation circuit is connected to the signal input end of the driving circuit; the output end of the driving circuit is connected to the feedback signal input end of the constant current power circuit; the voltage input end of the constant current power circuit is connected to the external test power supply, and the output end of the constant current power circuit is connected to a common anode of backlight light-emitting diodes (LED) which are connected in parallel on a backlight driver board to be tested; and the input end of the starting circuit is connected to the cathode of any backlight LED of the backlight driver board to be tested, and the output end of the starting circuit is connected to the signal input end of the driving circuit. The problem about the universality of a load of the backlight driver board can be solved, and an aging test in the backlight driver board can be quickly realized.
Description
Technical field
The utility model relates to backlight drive board test field, in particular to a kind of LED-backlit drive plate burn in test circuit.
Background technology
Along with popularizing of LED-backlit televisor; In the production run of LED-backlit televisor; Some production problems just highlight day by day, and for example just there are some problems in the test problem for backlight drive plate (being called for short the DR plate), and LED-backlit televisor model is numerous at present; Correspondingly its DR plate also has numerous models; The varying number of cement resistor or the diode aging method of existing test DR plate normally all adopts to(for) the DR plate of every kind of different model are as test load, so testing efficiency is lower, and cost is higher.
As shown in Figure 1, it makees the synoptic diagram of the fictitious load of DR board test voltage Vboost for the high-power cement resistor of existing usefulness, in test process, according to the DR plate determine the correlation parameter of high-power cement resistor with the quantity of the string number of LED and every string LED.When adopting the method; Since the DR plate of different model different with the string number of LED with the quantity of every string LED; So the parameter setting for high-power cement resistor is also different; Therefore when the DR plate of the multiple different model of test, need the high-power cement resistor of labor, its efficient reduces, and cost is higher.
As shown in Figure 2, its for existing be the synoptic diagram of making the fictitious load of DR board test voltage Vboost of general-purpose diode.The load characteristic of similar above-mentioned true LED; Because DR plate model is different; And the LED quantity of LED display is also different, and therefore the quantity of used general-purpose diode is also different, according to the model of different DR plates; Serve as each DR plate the quantity of load-carrying diode do not wait enormous amount to several thousand from hundreds of.Therefore expend higher.
In sum, how to provide a kind of efficient higher and lower-cost backlight drive board test circuit, thereby the test of Rapid Realization backlight drive plate and changing the line of production just seem particularly important.
The utility model content
The purpose of the utility model is to provide a kind of backlight drive plate burn in test circuit, and it can solve the versatility problem of backlight drive plate plate load, burn-in test that can Rapid Realization backlight drive plate.
In order to reach the purpose of the utility model, the utility model adopts following technical scheme to realize:
A kind of backlight drive plate burn in test circuit comprises regulating circuit, driving circuit, constant current power circuit and start-up circuit, wherein,
The input end of said regulating circuit is connected to the external testing power supply, and its output terminal is connected to the signal input part of driving circuit;
The output terminal of said driving circuit is connected to the feedback signal input end of said constant current power circuit;
The voltage input end of said constant current power circuit is connected to the external testing power supply, and its output terminal is connected to the common anode that is arranged at many on the backlight drive plate to be measured backlight LED that are connected in parallel;
The input end of said start-up circuit is connected to the negative electrode of arbitrary backlight LED of backlight drive plate to be measured, and its output terminal is connected to the signal input part of driving circuit.
Preferably, said external testing power supply is the power supply of liquid crystal display module, and the power supply of said liquid crystal display module is connected to the input end of said regulating circuit and the voltage input end of said constant current power circuit through the DC-DC DC converting circuit.
More preferably; Said DC-DC DC converting circuit comprises 1 three terminal regulator U2,6 electric capacity of voltage regulation, 1 current-limiting resistance; And 1 LED light, the input end of said three terminal regulator U2 is connected to the power supply of liquid crystal display module, is connected to a common port of two electric capacity of voltage regulation that are connected in parallel simultaneously; The output terminal of said three terminal regulator U2 is connected to the anode of LED light through said current-limiting resistance; Be connected to a common port of four electric capacity of voltage regulation that are connected in parallel simultaneously, the earth terminal ground connection of said three terminal regulator U2, the equal ground connection of the other end of said electric capacity of voltage regulation.
More preferably, the model of said three terminal regulator U2 is LM7812.
Preferably; Said regulating circuit comprises that two are regulated chip SW1; Said two first pin to the, ten pins of regulating chip SW1 are connected on 19 divider resistances that are connected in series the compartment of terrain successively; Said two the 11 pin and the 12 pins of regulating chip SW1 are unsettled, and said two the tenth three-prong to the 16 pins of regulating chip SW1 all are connected to first pin each other.
Preferably; Said start-up circuit comprises the first triode Q4, the second triode Q5, divider resistance R2, divider resistance R39 and divider resistance R28; The base stage of the said second triode Q5 is connected to the negative electrode of arbitrary backlight LED of backlight drive plate to be measured; Its grounded collector, its emitter connects high level through pull-up resistor R29 and is connected with the base stage of the first triode Q4, and the emitter of the said first triode Q4 is through the divider resistance R39 and the divider resistance R28 ground connection of parallel connection; Its collector connects high level, and the emitter of the said first triode Q4 is connected to the signal input part of driving circuit through divider resistance R2.
Preferably; Said driving circuit comprises operational amplifier U1, the 3rd triode Q6, and the 4th triode Q7; The negative pole of said operational amplifier U1 is connected to the common anode of many backlight LED that are connected in parallel through divider resistance; Its positive pole is connected to the output terminal of start-up circuit, and its output terminal connects the base stage that is connected to the 3rd triode Q6 and the 4th triode Q7 through divider resistance, and the collector of said the 3rd triode Q6 connects high level; Its emitter is connected to the emitter of the 4th triode Q7, the grounded collector of said the 4th triode Q7.
Preferably, said operational amplifier U1 is technical grade amplifier LM258P.
Preferably; Said constant current power circuit comprises CMOS pipe Q1, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3; The grid of said CMOS pipe Q1, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3 all connects high level; Its drain electrode all is connected to the external testing power supply, and its source electrode all is connected to the common anode of many backlight LED that are connected in parallel.
More preferably, the model of said CMOS pipe Q1, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3 is RFP260N.
Technical scheme through above-mentioned the utility model can be found out, the utlity model has following beneficial effect:
1, the electric current of every string LED keeps constant because the Vboost that provides through the utility model flows through, and the every group of sampling pin sampling voltage that feeds back to the backlight drive plate simultaneously also requires constant, when starting moment; Backlight drive plate sampling end (D1-1, D1-2 ... Dn-n) detect that to flow through the LED electric current little; Via PWM its Vboost is raise, ultimate current, sampling voltage all reach steady state value, and Vboost no longer raises; Keep the value of this moment, the system that load and DR plate are formed reaches mobile equilibrium.
2, utilize the transfer characteristics and the output characteristics of CMOS pipe to realize the output constant current.
3, utilize output feedback regulation and operational amplifier characteristics to realize the output constant voltage.
Description of drawings
Fig. 1 is the synoptic diagram that the high-power cement resistor of existing usefulness is done the fictitious load of DR board test voltage Vboost;
Fig. 2 be existing be the synoptic diagram of making the fictitious load of DR board test voltage Vboost of general-purpose diode;
Fig. 3 is the backlight drive plate burn in test circuit structural representation that the utility model embodiment provides;
Fig. 4 is the backlight drive plate burn in test circuit figure that the utility model embodiment provides.
The realization of the utility model purpose, functional characteristics and excellent effect will combine specific embodiment and accompanying drawing to do further explanation below.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the said technical scheme of the utility model is done further to describe in detail; So that those skilled in the art can better understand the utility model and implementing, but the embodiment that lifts not conduct to the qualification of the utility model.
As shown in Figure 3, the utility model embodiment provides a kind of backlight drive plate burn in test circuit, and it comprises regulating circuit 10, driving circuit 20, constant current power circuit 30 and start-up circuit 40, wherein,
The input end of said regulating circuit 10 is connected to the external testing power supply; Its output terminal is connected to the signal input part of driving circuit 20; Wherein, Said external testing power supply is the power supply of liquid crystal display module, and the power supply of said liquid crystal display module is connected to the input end of said regulating circuit 10 and the voltage input end of said constant current power circuit 30 through DC-DC DC converting circuit (not shown, it is in order to provide Vboost);
The output terminal of said driving circuit 20 is connected to the feedback signal input end of said constant current power circuit 30;
The voltage input end of said constant current power circuit 30 is connected to the external testing power supply, and its output terminal is connected to the common anode that is arranged at many on the backlight drive plate to be measured backlight LED that are connected in parallel;
The input end of said start-up circuit 40 is connected to the negative electrode of arbitrary backlight LED of backlight drive plate to be measured, and its output terminal is connected to the signal input part of driving circuit 20.
Under the preferred implementation, as shown in Figure 4, said DC-DC DC converting circuit comprises 1 three terminal regulator U2,6 electric capacity of voltage regulation, 1 current-limiting resistance; And 1 LED light; The model of for example said three terminal regulator U2 is LM7812, and the input end of said three terminal regulator U2 is connected to the power supply of liquid crystal display module, is connected to a common port of two electric capacity of voltage regulation that are connected in parallel simultaneously; The output terminal of said three terminal regulator U2 is connected to the anode of LED light through said current-limiting resistance; Be connected to a common port of four electric capacity of voltage regulation that are connected in parallel simultaneously, the earth terminal ground connection of said three terminal regulator U2, the equal ground connection of the other end of said electric capacity of voltage regulation.
With reference to Fig. 4; Said regulating circuit 10 comprises that two are regulated chip SW1; Said two first pin to the, ten pins of regulating chip SW1 are connected on 19 divider resistances that are connected in series the compartment of terrain successively; Said two the 11 pin and the 12 pins of regulating chip SW1 are unsettled, and said two the tenth three-prong to the 16 pins of regulating chip SW1 all are connected to first pin each other.
Regulate chip SW1/SW2 and divider resistance on every side thereof and constituted regulating circuit 10 parts; When operate as normal; Total system is in equilibrium state; The size of load current depends on the size of the anodal U+ of operational amplifier U1, and the size of regulating anodal U+ promptly is the size of having regulated whole load current.(U+)-(U-) ≈ ULED=UR2=(R2/ (Rt+R2)) * Vboost=ULED/ (ULED+URt) during equilibrium state, because the pressure drop of each backlight LED is identical, this formula just is equivalent to the ratio of the quantity of diode, i.e. 1/N; N represents the quantity of every string backlight LED, and N=n+1, n are regulated value, the backlight driver plate of different model; According to its specifications, the quantity N of known every string backlight LED pushes corresponding position n with the by-pass cock in the regulating circuit 10; N=N-1 wherein, regulates chip SW1 and is represented as ten; Regulate chip SW2 and be represented as a position, maximal regulated 99, promptly regulating maximal value is 99.Wherein, Vboost is the output valve of above-mentioned DC-DC DC converting circuit.
During concrete the design; Regulate chip SW1 and form primary sample with ten 20K divider resistances; Regulate chip SW2 and carry out secondary sample again, so just accomplished 0～99 grade of dividing potential drop sampling, mention every string backlight LED maximum above being equivalent to and to be with 99 LED loads with nine 2K divider resistances.During practical application, from Vboost input beginning, the node mark 0～9 of regulating the corresponding 20K resistance in series number of chip SW1 is as ten, and the node mark 0～9 of regulating the corresponding 2K resistance in series number of chip SW2 is as a position.
Said start-up circuit 40 comprises the first triode Q4, the second triode Q5, divider resistance R2, divider resistance R39 and divider resistance R28; The base stage of the said second triode Q5 is connected to the negative electrode of arbitrary backlight LED of backlight drive plate to be measured; Its grounded collector; Its emitter connects high level through pull-up resistor R29 and is connected with the base stage of the first triode Q4; The emitter of the said first triode Q4 is through the divider resistance R39 and the divider resistance R28 ground connection of parallel connection, and its collector connects high level, and the emitter of the said first triode Q4 is connected to the signal input part of driving circuit 20 through divider resistance R2.
When backlight driver plate powered on moment; This moment, constant current power circuit 30 comprised Q2 (RFP260N) be in cut-off state; The electric current of backlight LED of being equivalent to flow through is 0; Sampling end (D1-1, D1-2 that backlight driver is done ... D3-8) voltage also is that 0, the first triode Q4 ends, and the voltage swing of the electrode input end of operational amplifier U1 is:
U+={(R2+R39//R28)/(Rt+(R2+R39//R28))}*Vboost，
The PWM of backlight driver plate raises Vboost; This is that U+ is also along with rising; Q2 open, the LED electric current that is equivalent to flow through rises, sampling spot voltage (D1-1, the D1-2 of backlight driver plate ... D3-8) raise; The emitter of the first triode Q4 has been followed the magnitude of voltage of sampling spot at this moment, and this process has been accomplished the startup of backlight driver plate.The existence of R39/R38, the input U+ of U1 loses RP when having avoided starting, and surpasses the input range of U1 (LM258P).
Realize that through said start-up circuit 40 process of constant current and constant voltage is:
When the anodal U+ of operational amplifier U1 is a steady state value; The raceway groove of the CMOS pipe Q1 that constant current this moment power circuit 30 comprises, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3RFP260N chip is opened constant; Be current constant, the needed current value of system is determined by regulation voltage level.Void according to the amplifier input end is broken/empty short principle knowledge: U+=U-, with reference to figure 4, so V
D1-1Also be constant.When certain reason makes V
D1-1When diminishing, VR28//R39 follows and diminishes, and U+ raises, and U-raises, V
D1-1Also raise, can find out, passed through this feedback procedure V in system's operate as normal
D1-1Remain constant, V
D1-2V
D3-8Also kept constant.
Under the preferred implementation, said driving circuit 20 comprises operational amplifier U1 (in the present embodiment, said operational amplifier U1 is technical grade amplifier LM258P); The 3rd triode Q6; And the 4th triode Q7, the negative pole of said operational amplifier U1 is connected to the common anode of many backlight LED that are connected in parallel through divider resistance, and its positive pole is connected to the output terminal of start-up circuit 40; Its output terminal connects the base stage that is connected to the 3rd triode Q6 and the 4th triode Q7 through divider resistance; The collector of said the 3rd triode Q6 connects high level, and its emitter is connected to the emitter of the 4th triode Q7, the grounded collector of said the 4th triode Q7.
Continuation is with reference to Fig. 4; Said constant current power circuit 30 comprises CMOS pipe Q1, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3; The grid of said CMOS pipe Q1, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3 all connects high level, and its drain electrode all is connected to the external testing power supply, and its source electrode all is connected to the common anode of many backlight LED that are connected in parallel; Wherein, the model of said CMOS pipe Q1, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3 is RFP260N.
Wherein, said three CMOS pipe Q1/Q2/Q3 parallel connection constitutes, and purpose is to increase output power.Resistance R 1/R22/R33/R34/R35/R36 plays metering function here, in addition, and the electrostatic damage of above-mentioned three CMOS pipe of said resistance R 40 protections.
In the utility model embodiment; Said backlight drive plate burn in test circuit also comprises LED display circuit 50, and it comprises many backlight LED that are connected in parallel, LED-backlit lamp D1-1～D3-8 as shown in Figure 4; It has double action in circuit; The one, be used for showing that when the total system operate as normal of load and backlight drive plate formation, backlight LED is bright; Backlight LED does not work when improper.The 2nd, be used for sampling, the embodiment of said sampling please refer to mentioned above, through sampling, makes load have certain LED characteristic.
The flow through electric current of every string LED of the Vboost that provides through the utility model keeps constant, and the every group of sampling pin sampling voltage that feeds back to the backlight drive plate simultaneously also requires constant, when starting moment; Backlight drive plate sampling end (D1-1, D1-2 ... Dn-n) detect that to flow through the LED electric current little; Via PWM its Vboost is raise, ultimate current, sampling voltage all reach steady state value, and Vboost no longer raises; Keep the value of this moment, the system that load and DR plate are formed reaches mobile equilibrium.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (10)
1. a backlight drive plate burn in test circuit is characterized in that, comprises regulating circuit, driving circuit, constant current power circuit and start-up circuit, wherein,
The input end of said regulating circuit is connected to the external testing power supply, and its output terminal is connected to the signal input part of driving circuit;
The output terminal of said driving circuit is connected to the feedback signal input end of said constant current power circuit;
The voltage input end of said constant current power circuit is connected to the external testing power supply, and its output terminal is connected to the common anode that is arranged at many on the backlight drive plate to be measured backlight LED that are connected in parallel;
The input end of said start-up circuit is connected to the negative electrode of arbitrary backlight LED of backlight drive plate to be measured, and its output terminal is connected to the signal input part of driving circuit.
2. backlight drive plate burn in test circuit as claimed in claim 1; It is characterized in that; Said external testing power supply is the power supply of liquid crystal display module, and the power supply of said liquid crystal display module is connected to the input end of said regulating circuit and the voltage input end of said constant current power circuit through the DC-DC DC converting circuit.
3. backlight drive plate burn in test circuit as claimed in claim 2; It is characterized in that said DC-DC DC converting circuit comprises 1 three terminal regulator U2,6 electric capacity of voltage regulation, 1 current-limiting resistance, and 1 LED light; The input end of said three terminal regulator U2 is connected to the power supply of liquid crystal display module; Be connected to a common port of two electric capacity of voltage regulation that are connected in parallel simultaneously, the output terminal of said three terminal regulator U2 is connected to the anode of LED light through said current-limiting resistance, is connected to a common port of four electric capacity of voltage regulation that are connected in parallel simultaneously; The earth terminal ground connection of said three terminal regulator U2, the equal ground connection of the other end of said electric capacity of voltage regulation.
4. backlight drive plate burn in test circuit as claimed in claim 3 is characterized in that the model of said three terminal regulator U2 is LM7812.
5. backlight drive plate burn in test circuit as claimed in claim 1; It is characterized in that; Said regulating circuit comprises that two are regulated chip SW1; Said two first pin to the, ten pins of regulating chip SW1 are connected on 19 divider resistances that are connected in series the compartment of terrain successively, and said two the 11 pin and the 12 pins of regulating chip SW1 are unsettled, and said two the tenth three-prong to the 16 pins of regulating chip SW1 all are connected to first pin each other.
6. backlight drive plate burn in test circuit as claimed in claim 1; It is characterized in that; Said start-up circuit comprises the first triode Q4, the second triode Q5, divider resistance R2, divider resistance R39 and divider resistance R28; The base stage of the said second triode Q5 is connected to the negative electrode of arbitrary backlight LED of backlight drive plate to be measured; Its grounded collector, its emitter connects high level through pull-up resistor R29 and is connected with the base stage of the first triode Q4, and the emitter of the said first triode Q4 is through the divider resistance R39 and the divider resistance R28 ground connection of parallel connection; Its collector connects high level, and the emitter of the said first triode Q4 is connected to the signal input part of driving circuit through divider resistance R2.
7. backlight drive plate burn in test circuit as claimed in claim 1 is characterized in that said driving circuit comprises operational amplifier U1; The 3rd triode Q6; And the 4th triode Q7, the negative pole of said operational amplifier U1 is connected to the common anode of many backlight LED that are connected in parallel through divider resistance, and its positive pole is connected to the output terminal of start-up circuit; Its output terminal connects the base stage that is connected to the 3rd triode Q6 and the 4th triode Q7 through divider resistance; The collector of said the 3rd triode Q6 connects high level, and its emitter is connected to the emitter of the 4th triode Q7, the grounded collector of said the 4th triode Q7.
8. backlight drive plate burn in test circuit as claimed in claim 7 is characterized in that, said operational amplifier U1 is technical grade amplifier LM258P.
9. backlight drive plate burn in test circuit as claimed in claim 1; It is characterized in that; Said constant current power circuit comprises CMOS pipe Q1, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3; The grid of said CMOS pipe Q1, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3 all connects high level, and its drain electrode all is connected to the external testing power supply, and its source electrode all is connected to the common anode of many backlight LED that are connected in parallel.
10. backlight drive plate burn in test circuit as claimed in claim 9 is characterized in that, the model of said CMOS pipe Q1, the 2nd CMOS pipe Q2 and the 3rd CMOS pipe Q3 is RFP260N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205414838U CN202421370U (en) | 2011-12-21 | 2011-12-21 | Aging test circuit for backlight driver board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205414838U CN202421370U (en) | 2011-12-21 | 2011-12-21 | Aging test circuit for backlight driver board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202421370U true CN202421370U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205414838U Expired - Fee Related CN202421370U (en) | 2011-12-21 | 2011-12-21 | Aging test circuit for backlight driver board |
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| CN (1) | CN202421370U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914384A (en) * | 2015-03-25 | 2015-09-16 | 广东长虹电子有限公司 | Dual-purpose cellular-type LED lamp strip frock of ageing |
| CN104950239A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | Backlight driving detection circuit |
| CN109410807A (en) * | 2018-11-21 | 2019-03-01 | 惠科股份有限公司 | drive circuit and display panel |
-
2011
- 2011-12-21 CN CN2011205414838U patent/CN202421370U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104950239A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | Backlight driving detection circuit |
| CN104950239B (en) * | 2014-03-25 | 2019-06-07 | 深圳市海洋王照明工程有限公司 | A kind of backlight drive detection circuit |
| CN104914384A (en) * | 2015-03-25 | 2015-09-16 | 广东长虹电子有限公司 | Dual-purpose cellular-type LED lamp strip frock of ageing |
| CN109410807A (en) * | 2018-11-21 | 2019-03-01 | 惠科股份有限公司 | drive circuit and display panel |
| US11443666B2 (en) | 2018-11-21 | 2022-09-13 | HKC Corporation Limited | Drive circuit for adjusting a voltage required for aging detection using a feedback circuit, and display panel |
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Granted publication date: 20120905 Termination date: 20181221 |