CN201893106U - Driving control circuit of light emitting diode (LED) back light source - Google Patents
Driving control circuit of light emitting diode (LED) back light source Download PDFInfo
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- CN201893106U CN201893106U CN2010206101249U CN201020610124U CN201893106U CN 201893106 U CN201893106 U CN 201893106U CN 2010206101249 U CN2010206101249 U CN 2010206101249U CN 201020610124 U CN201020610124 U CN 201020610124U CN 201893106 U CN201893106 U CN 201893106U
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Abstract
The utility model relates to a driving control circuit of a light emitting diode (LED) back light source, which comprises a driving circuit, a voltage feedback circuit, a back light regulation circuit, a current control circuit and an LED lamp tube, wherein the driving circuit, the voltage feedback circuit, the back light regulation circuit, the current control circuit and the LED lamp tube are mutually connected, one end of the current control circuit is connected with the LED lamp tube, the other end of the current control circuit is sequentially connected with the back light regulation circuit, the voltage feedback circuit and the driving circuit, the driving circuit comprises a driving control chip, a main driving capacitor and a main driving voltage stabilizer tube, the current control circuit comprises a current control triode, a current detection resistor and a current control voltage stabilizer tube, the back light regulation circuit comprises a No.1 regulation triode, a No.2 regulation triode and a No.3 regulation triode which are mutually connected, and the voltage feedback circuit comprises a transformer, a voltage signal end, a light emitting tube and a light receiving tube. The driving control circuit disclosed by the utility model has the advantages of compete function, simple structure and low cost and is easy to control.
Description
Technical field
The utility model relates to a kind of control circuit, relates in particular to the Drive and Control Circuit in a kind of LED-backlit source, specifically be applicable to the LED-backlit source efficiently, drive controlling cheaply.
Background technology
Along with flat panel TV develops towards slimming, the LED TV has become a kind of trend.Though, backlight develops into LED from LCD and has brought lot of superiority, but also design has brought challenge to power supply, how to drive and control the problem that the LED electric current has become the power supply design to face, remove to control the LED electric current with integrated IC, be difficult to accomplish the control of large scale LED-backlit, remove to build the LED-backlit circuit with discrete component and become a kind of desirable selection, different Drive and Control Circuit is just arranged accordingly, how go to finish the breakthrough point that LED-backlit drive controlling has efficiently become new technology with minimum cost, the utility model produces under such background.
The Chinese patent publication number is CN101430863A, the patent of invention that open day is on May 13rd, 2009 discloses a kind of LED-backlit source driving circuit, by the interface that is used for I/O power supply and control signal, the 12V DC voltage that is used for importing changes into the output of 5V reference voltage and reaches the DC/DC converter of powering for controller, be used for controlling controller and the booster driving circuit composition that booster driving circuit is opened and closed according to brightness regulation voltage and switch regulation voltage, booster driving circuit is used for the 12V DC voltage of input is raise, with constant-current driving backlight LED, and open or close according to the control signal of controller output and drive the loop.Though the driving circuit of this invention makes LED drive efficient up to more than 90% by the mixing regulative mode that employing integrates PWM and PFM, but it adopts integrated IC to remove to control the LED electric current, not only be difficult to accomplish large scale LED backlight control, controlled a little less than, and complex structure, in addition, this invention has only related to drive controlling, and does not relate to the control of the aspects such as switching, brightness and feedback of backlight, and function is less.
Summary of the invention
The purpose of this utility model is to overcome less, controlled weak, baroque defective of the function that exists in the prior art and problem, and the Drive and Control Circuit in more, the controlled LED-backlit source stronger, simple in structure of a kind of function is provided.
For realizing above purpose, technical solution of the present utility model is: the Drive and Control Circuit in a kind of LED-backlit source, comprise interconnective driving circuit, adjustment circuit backlight, current control circuit and LED fluorescent tube, one end of described current control circuit is connected with the LED fluorescent tube, the other end is connected with adjustment circuit backlight, and the other end of adjustment circuit backlight is connected with driving circuit; Described Drive and Control Circuit also comprises voltage feedback circuit, and an end of voltage feedback circuit is connected with driving circuit, and the other end is connected with the other end of adjustment circuit backlight.
Described driving circuit comprises drive controlling chip, main electric capacity and the main stabilivolt that drives of driving, a main end that drives electric capacity is connected with main stabilivolt and driving resistor of driving parallel with one another, the main other end that drives stabilivolt, main driving resistor is connected with the drive controlling chip, is connected with process auxiliary drive electric capacity parallel with one another, No. two driving resistor and No. three driving resistor on the drive controlling chip.
Described current control circuit comprises Current Control triode, current sense resistor and Current Control stabilivolt, and the C utmost point of described Current Control triode is connected with the LED fluorescent tube, the E utmost point is connected with Current Control stabilivolt, adjustment circuit backlight by current sense resistor ground connection, the B utmost point.
Described adjustment circuit backlight comprises an interconnective adjustment triode, adjusts triodes for No. two and adjusts triodes No. three, the E utmost point of a described adjustment triode is connected with the ENA signal end, the B utmost point is connected with the DIM signal end, the C utmost point is connected with No. two adjustment triodes, the other end of adjusting triode for No. two is connected with the B utmost point of No. three adjustment triodes, and the C utmost point of No. three adjustment triodes is connected with current control circuit, the E utmost point is connected with adjustment voltage source, a feedback resistance.
Described voltage feedback circuit comprises transformer, voltage signal end, luminotron and light-receiving tube, described voltage signal end is connected with transformer parallel with one another, No. two feedback resistances by feedback resistance, a luminotron, the other end of transformer, No. two feedback resistances is connected with light-receiving tube, the other end ground connection of light-receiving tube; The voltage of described voltage signal end collection is the voltage of Current Control triode.
The model of described drive controlling chip is TNY277, and frequency of operation is 130KHz, and the reference voltage of described Current Control stabilivolt inner setting is 1.25V.
Compared with prior art, the beneficial effects of the utility model are:
1, because the Drive and Control Circuit in a kind of LED-backlit of the utility model source comprises interconnective driving circuit, voltage feedback circuit, adjustment circuit backlight, current control circuit and LED fluorescent tube, comprise the drive controlling chip in the driving circuit, simultaneously, voltage feedback circuit, adjustment circuit backlight, current control circuit constitutes by discrete component, thereby realized the purpose of high-efficiency and low-cost, in addition, driving circuit avoids circuit destroyed by the closure of controlling and driving control chip, voltage feedback circuit passes through to detect the variation of Current Control triode voltage to realize control output voltage, adjustment circuit backlight is brought in by control ENA signal end and DIM signal and is realized that whether and the size of the brightness of working work backlight, current control circuit realizes controlling the purpose of lamp current by Control current control triode, make its electric current be no more than setting, the electric current of optocoupler and the gain of feedback thereby control is flowed through, make output voltage stabilization in a reasonable range, and the realization of these comprehensive functions is that to be based upon the electronic component number less, on the comparatively simple basis of structure, reached fully with minimum components and parts, minimum cost goes to finish the purpose of LED-backlit source drive controlling efficiently.Therefore the utility model is not only multiple functional, easy to control, and simple in structure, cost is lower.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Among the figure: LED fluorescent tube 1, driving circuit 2, drive controlling chip 21, the main electric capacity 22 that drives, main 23, numbers driving resistor 24 of stabilivolt that drive, 26, No. three driving resistor 27 of 25, No. two driving resistor of process auxiliary drive electric capacity, adjustment circuit backlight is adjusted triode for 3, No. one and is adjusted triode 32 31, No. two, adjust triode 33, ENA signal end 34, DIM signal end 35 No. three, adjust voltage source 36, current control circuit 4, Current Control triode 41, current sense resistor 42, Current Control stabilivolt 43, voltage feedback circuit 5, transformer 51, voltage signal end 52, luminotron 53, light-receiving tube 54,55, No. two feedback resistances 56 of a feedback resistance.
Embodiment
Below in conjunction with description of drawings and embodiment the utility model is described in further detail
Referring to Fig. 1, the Drive and Control Circuit in a kind of LED-backlit source, comprise interconnective driving circuit 2, adjustment circuit 3 backlight, current control circuit 4 and LED fluorescent tube 1, one end of current control circuit 4 is connected with LED fluorescent tube 1, the other end is connected with adjustment circuit 3 backlight, and the other end of adjustment circuit 3 backlight is connected with driving circuit 2; The preferred Drive and Control Circuit of the utility model also comprises voltage feedback circuit 5, and an end of voltage feedback circuit 5 is connected with driving circuit 2, and the other end is connected with the other end of adjustment circuit 3 backlight.The utility model is made driving circuit with the single-chip switching power supply chip, makees control circuit with discrete component, thereby realizes the purpose of high-efficiency and low-cost.
Preferred driving circuit 2 comprises drive controlling chip 21, main electric capacity 22 and the main stabilivolt 23 that drives of driving, a main end that drives electric capacity 22 is connected with main stabilivolt 23 and driving resistor 24 of driving parallel with one another, the main other end that drives stabilivolt 23, main driving resistor 24 is connected with drive controlling chip 21, is connected with process auxiliary drive electric capacity parallel with one another 25, No. two driving resistor 26 and No. three driving resistor 27 on the drive controlling chip 21.Driving circuit 2 is a voltage conversion circuit, adopts the reverse exciting topological framework, and circuit uses TNY277 as drive controlling chip 21, this chip is the monolithic integrated form, and the PIN pin is few, and peripheral circuit is succinct, the efficient height, cost is low and other circuit superiority is obvious by comparison.The average frequency of operation of chip can reach 130KHz, can reduce the volume of transformer like this.In addition; circuit also has overvoltage protection and overcurrent protection function; detailed process is; if abnormal conditions, when voltage reaches 23V on the main driving electric capacity 22,23 conductings of main driving stabilivolt; the electric current that flows to drive controlling chip 21 like this can surpass the shutter threshold currents of chip; chip enters guard mode, and after abnormal conditions disappeared, chip can be restarted automatically.If load is excessive or when output short-circuit occurring, the electric current that is reflected at primary side also can rise, when reaching the threshold current that chip sets, chip enters latch mode, and then holding circuit exempts from destruction.Flow through what of size decision chip output energy of the optocoupler magnitude of current.
Preferred current control circuit 4 comprises Current Control triode 41, current sense resistor 42 and Current Control stabilivolt 43, and the C utmost point of described Current Control triode 41 is connected with LED fluorescent tube 1, the E utmost point is connected with Current Control stabilivolt 43, adjustment circuit 3 backlight by current sense resistor 42 ground connection, the B utmost point.Current control circuit 4 is gone here and there a triode and resistance on every fluorescent tube, when lamp current reaches setting, the reference voltage 1.25V of voltage on the current sense resistor 42 and Current Control stabilivolt 43 inside compares, and the choosing value of resistance is relevant with the size of lamp current.When voltage surpassed 1.25V, the C of Current Control stabilivolt 43 drew ground to the triode B utmost point extremely to the conducting of the A utmost point, closed triode and then reached the purpose of controlling lamp current, made its electric current be no more than setting.Get the reference point of triode C pole tension, remove to control the electric current of optocoupler of flowing through, thereby the gain of Control and Feedback makes output voltage stabilization in a reasonable range as Voltage Feedback.
Current Control triode 41 is the lamp current gauge tap, when reaching limit switch, electric current closes, its C utmost point connects the output terminal of fluorescent tube, the E utmost point links to each other with current sense resistor 42, its control procedure is such: lamp current is by Current Control triode 41, current sense resistor 42 constitutes the loop to ground, current sense resistor 42 detects lamp current, and compare with the form of voltage and the reference voltage 1.25V of Current Control stabilivolt 43 inside, when sampling voltage is higher than internal reference voltage, 43 conductings of Current Control stabilivolt are drawn ground to the B utmost point of Current Control triode 41, Current Control triode 41 is closed, cut off lamp current, thereby reach the purpose of control lamp current, the size of choosing with lamp current of current sense resistor 42 has relation, its corresponding relation is R=1.25/I, and I is the maximal value of lamp current.When electric current surpassed maximal value, corresponding sampling voltage also can surpass 1.25V, and then meeting off switch pipe, and a such circuit controls is operated in the reasonable range lamp current always.
Preferred adjustment circuit 3 backlight comprises interconnectively to be adjusted triode 31 for No. one, adjusts triode 32 and No. three adjustment triodes 33 No. two, the E utmost point of a described adjustment triode 31 is connected with ENA signal end 34, the B utmost point is connected with DIM signal end 35, the C utmost point is connected with No. two adjustment triodes 32, the other end of adjusting triodes 32 for No. two is connected with the B utmost point of adjusting triodes 33 for No. three, and the C utmost point of adjusting triodes 33 for No. three is connected with current control circuit 4, the E utmost point and adjustment voltage source 36, a feedback resistance 55 are connected.Adjusting voltage source 36 in the adjustment circuit backlight is 5.2V, this voltage is the voltage that power supply provides, ENA signal end 34 and DIM signal end 35 are enable signal and brightness adjusting signals that mainboard provides, the ENA signal is high level or low level signal, ENA is high work backlight, ENA does not then backlightly work for low, and the DIM signal is a pwm signal, adjusts the size of backlight illumination with the size of its dutycycle.Its working mechanism is such, if ENA enables, DIM is in one-period, an adjustment triode 31 conductings when DIM is high level, enable signal ENA adjusts the B utmost point that triode 31 arrives No. two adjustment triodes 32 by No. one, make 32 conductings of No. two adjustment triodes, and then be 5.2V through feedback resistance 55 and No. two feedback resistances 56 dividing potential drop on No. two feedback resistances 56 at the voltage that the B that adjusts triode 31 for No. extremely goes up, this voltage and 5.2V form a negative pressure reduction, impel and adjust triode 31 conductings, 5.2V voltage adjust triode 31 through No. one and arrive current control circuits 4, the light current-controlled switch, be that Current Control triode 41 is opened, work backlight.When DIM is low level, adjusting triode 31 No. one closes, make the B utmost point of No. two adjustment triodes 32 not have cut-in voltage, adjust triode 32 not conductings No. two, and then make and adjust triode 31 also not conductings, enter current control circuit 4 for low level, Current Control triode 41 is closed, and does not backlightly work.By adjusting the size of the positive dutycycle of DIM signal, make intermittent work backlight, thereby reach the purpose of adjusting backlight illumination.
Preferred voltage feedback circuit 5 comprises transformer 51, voltage signal end 52, luminotron 53 and light-receiving tube 54, described voltage signal end 52 is connected by feedback resistance 55, luminotron 53 and transformer parallel with one another 51, No. two feedback resistances 56, the other end of transformer 51, No. two feedback resistances 56 is connected the other end ground connection of light-receiving tube 54 with light-receiving tube 54; The voltage that described voltage signal end 52 is gathered is the voltage of Current Control triode 41.Voltage signal end 52 in the voltage feedback circuit 5 is sampling fluorescent tube gauge tap, be the voltage on the Current Control triode 41, adjust the voltage of transformer 51 outputs by the variation of voltage signal end 52, thereby reach the purpose of regulated output voltage, its course of work is such.When output voltage raises, the voltage that drops on accordingly on the voltage signal end 52 also can raise, flow through so luminotron 53 on electric current will raise, electric current on the corresponding light-receiving tube 54 also can raise, the drive controlling of flowing through chip 21 electric currents are big more, and the dutycycle of its chip internal driving pwm signal will be more little, will impel drive controlling chip 21 outputs energy still less like this, output voltage is reduced, reach degenerative effect; Otherwise, output voltage is raise by control loop if output voltage reduces.So just can control output voltage by the variation of detectable voltage signals end 52 voltages.
The model of preferred drive controlling chip 21 is TNY277, and frequency of operation is 130KHz, and the reference voltage of described Current Control stabilivolt 43 inner settings is 1.25V.The utility model design selects for use TNY277 as drive controlling chip 21, this chip is the monolithic integrated form, compare the metal-oxide-semiconductor that can save an outside with the chip of other types, and its peripheral control circuit is fairly simple, be beneficial to very much and draw wiring diagram and pcb board layout, and its frequency of operation up to 130KHz can make volume design less relatively of transformer.
Therefore the utility model is not only multiple functional, easy to control, and simple in structure, cost is lower.
The above only is a better embodiment of the present utility model; protection domain of the present utility model does not exceed with above-mentioned embodiment; as long as the equivalence that those of ordinary skills do according to the utility model institute disclosure is modified or changed, all should include in the protection domain of putting down in writing in claims.
Claims (6)
1. the Drive and Control Circuit in a LED-backlit source, comprise interconnective driving circuit (2), adjustment circuit backlight (3), current control circuit (4) and LED fluorescent tube (1), one end of described current control circuit (4) is connected with LED fluorescent tube (1), the other end is connected with adjustment circuit backlight (3), the other end of adjustment circuit backlight (3) is connected with driving circuit (2), it is characterized in that: described Drive and Control Circuit also comprises voltage feedback circuit (5), one end of voltage feedback circuit (5) is connected with driving circuit (2), and the other end is connected with the other end of adjustment circuit backlight (3).
2. the Drive and Control Circuit in a kind of LED-backlit according to claim 1 source, it is characterized in that: described driving circuit (2) comprises drive controlling chip (21), main electric capacity (22) and the main stabilivolt (23) that drives of driving, a main end that drives electric capacity (22) is connected with a main stabilivolt (23) and the driving resistor (24) of driving parallel with one another, the main stabilivolt (23) that drives, the other end of main driving resistor (24) is connected with drive controlling chip (21), is connected with process auxiliary drive electric capacity (25) parallel with one another on the drive controlling chip (21), No. two driving resistor (26) and No. three driving resistor (27).
3. the Drive and Control Circuit in a kind of LED-backlit according to claim 1 and 2 source, it is characterized in that: described current control circuit (4) comprises Current Control triode (41), current sense resistor (42) and Current Control stabilivolt (43), and the C utmost point of described Current Control triode (41) is connected with LED fluorescent tube (1), the E utmost point is connected with Current Control stabilivolt (43), adjustment circuit backlight (3) by current sense resistor (42) ground connection, the B utmost point.
4. the Drive and Control Circuit in a kind of LED-backlit according to claim 3 source, it is characterized in that: described adjustment circuit backlight (3) comprises an interconnective adjustment triode (31), adjust triode (32) for No. two and adjust triode (33) with No. three, the E utmost point of a described adjustment triode (31) is connected with ENA signal end (34), the B utmost point is connected with DIM signal end (35), the C utmost point is connected with No. two adjustment triodes (32), the other end of adjusting triode (32) for No. two is connected with the B utmost point of No. three adjustment triodes (33), and the C utmost point of No. three adjustment triodes (33) is connected with current control circuit (4), the E utmost point and adjustment voltage source (36), a feedback resistance (55) is connected.
5. the Drive and Control Circuit in a kind of LED-backlit according to claim 4 source, it is characterized in that: described voltage feedback circuit (5) comprises transformer (51), voltage signal end (52), luminotron (53) and light-receiving tube (54), described voltage signal end (52) is connected with transformer (51), No. two feedback resistances (56) parallel with one another by a feedback resistance (55), luminotron (53), the other end of transformer (51), No. two feedback resistances (56) is connected with light-receiving tube (54), the other end ground connection of light-receiving tube (54); The voltage that described voltage signal end (52) is gathered is the voltage of Current Control triode (41).
6. the Drive and Control Circuit in a kind of LED-backlit according to claim 5 source, it is characterized in that: the model of described drive controlling chip (21) is TNY277, frequency of operation is 130KHz, and the reference voltage of described Current Control stabilivolt (43) inner setting is 1.25V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206101249U CN201893106U (en) | 2010-11-17 | 2010-11-17 | Driving control circuit of light emitting diode (LED) back light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206101249U CN201893106U (en) | 2010-11-17 | 2010-11-17 | Driving control circuit of light emitting diode (LED) back light source |
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| Publication Number | Publication Date |
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| CN201893106U true CN201893106U (en) | 2011-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206101249U Expired - Fee Related CN201893106U (en) | 2010-11-17 | 2010-11-17 | Driving control circuit of light emitting diode (LED) back light source |
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| CN (1) | CN201893106U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841242A (en) * | 2012-08-23 | 2012-12-26 | 青岛海信电器股份有限公司 | Sampling circuit and electronic equipment |
| CN103927959A (en) * | 2013-12-30 | 2014-07-16 | 上海中航光电子有限公司 | Voltage adjusting circuit of display device, and display device |
| CN107533827A (en) * | 2015-12-09 | 2018-01-02 | 华为技术有限公司 | Backlight circuit, electronic equipment and backlight adjusting method |
-
2010
- 2010-11-17 CN CN2010206101249U patent/CN201893106U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841242A (en) * | 2012-08-23 | 2012-12-26 | 青岛海信电器股份有限公司 | Sampling circuit and electronic equipment |
| CN102841242B (en) * | 2012-08-23 | 2015-06-17 | 青岛海信电器股份有限公司 | Sampling circuit and electronic equipment |
| CN103927959A (en) * | 2013-12-30 | 2014-07-16 | 上海中航光电子有限公司 | Voltage adjusting circuit of display device, and display device |
| CN103927959B (en) * | 2013-12-30 | 2016-12-07 | 上海中航光电子有限公司 | The voltage regulator circuit of display device, display device |
| CN107533827A (en) * | 2015-12-09 | 2018-01-02 | 华为技术有限公司 | Backlight circuit, electronic equipment and backlight adjusting method |
| US10499472B2 (en) | 2015-12-09 | 2019-12-03 | Huawei Technologies Co., Ltd. | Backlight circuit, electronic device, and backlight adjustment method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110706 Termination date: 20121117 |