CN201550321U - LED driving control device - Google Patents
LED driving control device Download PDFInfo
- Publication number
- CN201550321U CN201550321U CN2009202053417U CN200920205341U CN201550321U CN 201550321 U CN201550321 U CN 201550321U CN 2009202053417 U CN2009202053417 U CN 2009202053417U CN 200920205341 U CN200920205341 U CN 200920205341U CN 201550321 U CN201550321 U CN 201550321U
- Authority
- CN
- China
- Prior art keywords
- signal
- control signal
- control device
- led
- driving control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 241000023320 Luma <angiosperm> Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- OSWPMRLSEDHDFF-UHFFFAOYSA-N methyl salicylate Chemical compound COC(=O)C1=CC=CC=C1O OSWPMRLSEDHDFF-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Landscapes
- Led Devices (AREA)
Abstract
The utility model relates to an LED driving control device which comprises a singlechip module and at least one back-stage functional module which is electrically connected to the singlechip module, wherein the singlechip module comprises a digital-to-analogue conversion unit and a control signal generating unit; the digital-to-analogue conversion unit is used for being electrically connected with a sampling output end of the at least one back-stage functional module so as to receive simulated sampling signals and converts the simulated sampling signals into digital sampling signals; the control signal generating unit is used for receiving the digital sampling signals and produces control signals based on the digital sampling signals and preset strategies; and the at least one back-stage functional module is electrically connected with at least one output end of the control signal generating unit so as to receive the control signals and regulates the brightness of the output voltage and/or LED based on the control signals. The LED driving control device selects the singlechip module and an auxiliary element to realize the LED driving control and has low cost and high cost performance.
Description
Technical field
The utility model relates to the drive controlling field, more particularly, relates to a kind of LED driving control device.
Background technology
Light-emitting diode (LED) is widely used in LED display, LED illumination, mobile phone and the liquid crystal display television by using LED-backlit source.In order to reduce the led drive circuit cost, generally speaking, LED connects with series system, inserts in the drive circuit then.For example, led drive circuit output can drive the series connection group of being made up of 10 LEDs for 36 volts, exports 60 volts and can drive the series connection group of being made up of 16 LEDs, exports 168 volts and can drive the series connection group of being made up of 48 LEDs.
At present, existing LED drive integrated circult (being called for short IC), driving voltage below 60 volts (abbreviation low pressure), has only partial L ED drive IC can export more than 120 volts (abbreviation high pressure) mostly.The typical application circuit of conventional LED drive IC as shown in Figure 1.To drive 3 LED series connection groups is example, VIN is an input voltage, be generally 12V or 24V, rise to output voltage VO UT through booster circuit, output voltage VO UT is variable, decides on the number of LED in every group, be subjected to integrated circuit ISEN1, ISEN2, the ISEN3 pin is withstand voltage limits, VOUT has a maximum, is generally about 60V, and the LED number that has limited thus in every string is generally in 16.
In use in LED light source for illuminating, liquid crystal display television by using LED-backlit source, adopt multi-disc high-voltage LED drive IC to drive a plurality of LED strings mostly, it is higher relatively to drive cost.
The utility model content
The technical problems to be solved in the utility model is, drives a plurality of LED strings at the multi-disc high-voltage LED drive IC of prior art, drives the higher relatively defective of cost, provides a kind of cost lower, the LED driving control device that cost performance is higher.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of LED driving control device, comprising: one-chip computer module and at least one the back level functional module that is electrically connected to described one-chip computer module;
Wherein said one-chip computer module comprises:
D/A conversion unit, the sampling output that is used to be electrically connected to described at least one back level functional module to be receiving the analog sampling signal, and described analog sampling conversion of signals is become digital sampled signal;
Control signal generating unit is used to receive described digital sampled signal and generates control signal based on described digital sampled signal and preset strategy;
Described at least one back level functional module is electrically connected at least one output of control signal generating unit to receive described control signal and to adjust output voltage and/or LED brightness based on described control signal.
In LED driving control device described in the utility model, described control signal comprises output voltage control signal and pwm control signal.
In LED driving control device described in the utility model, described preset strategy comprises that when described digital sampled signal during greater than preset value reduce the duty ratio of output voltage control signal, control output voltage reduces; When described digital sampled signal during less than preset value, increase the duty ratio of output voltage control signal, control output voltage increases.
In LED driving control device described in the utility model, described back level functional module comprises: sampling resistor, the first transistor, boosting unit and LED string; Wherein, the voltage input end of described boosting unit is connected to input voltage, signal input end and receives the positive pole that described output voltage control signal, output are connected to the LED string, the source electrode of described the first transistor is connected to the negative pole that described LED goes here and there through sampling resistor ground connection, drain electrode reception pwm control signal, grid, and the tie point of the source electrode of described sampling resistor and described the first transistor is the sampling output of described back level functional module.
In LED driving control device described in the utility model, the brightness of described LED string is directly proportional with the duty ratio of described pwm control signal.
In LED driving control device described in the utility model, described boosting unit comprises: inductance, diode, transistor seconds, first resistance and electric capacity; One end of wherein said inductance is connected to voltage input end, the other end is connected to the anode of described diode and the grid of described transistor seconds, the negative electrode of described diode is connected to the positive pole of described output and electric capacity, the minus earth of described electric capacity, the source electrode of described transistor seconds is through first grounding through resistance, and signal input end drains.
In LED driving control device described in the utility model, described back level functional module further comprises the overvoltage detecting unit that is used to detect the overvoltage signal; Described one-chip computer module comprises the shutoff unit, and described shutoff unit is connected to the signal output part of described overvoltage detecting unit to receive described overvoltage signal and to generate with the cut-off signals of closing the LED string based on described overvoltage signal and default overvoltage protection threshold value.
In LED driving control device described in the utility model; described Overvoltage protecting unit comprises second resistance and the 3rd resistance that is connected in series between described output and the ground, and described shutoff unit is connected to the tie point of described second resistance and the 3rd resistance to receive the overvoltage signal.
In LED driving control device described in the utility model, described the first transistor and transistor seconds are N type metal-oxide-semiconductors, and described diode is a Schottky diode.
In LED driving control device described in the utility model, described one-chip computer module is a multichannel modulus single-chip microcomputer, all back level functional modules of each passage may command.
Implement LED driving control device of the present utility model, have following beneficial effect:
1, compare with existing special high-pressure LED drive IC, select for use AD single-chip microcomputer and auxiliary element to realize the LED drive controlling, cost is lower, cost performance is higher, and circuit flexibly, be easy to upgrading;
2, each LED string of drive, circuit parameter can independently be adjusted, and the energy loss of each string can be accomplished minimum, thereby the product energy-conserving and environment-protective, and realizes the current balance type of each LED string easily, guarantees the consistency of each LED cross luma degree.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the typical application circuit figure of conventional LED drive integrated circult;
Fig. 2 is the theory diagram of first embodiment of driving control device of the present utility model;
Fig. 3 is the schematic block circuit diagram of second embodiment of driving control device of the present utility model;
Fig. 4 is the circuit theory diagrams of back level functional module of the 3rd embodiment of driving control device of the present utility model;
Fig. 5 is the workflow diagram of the one-chip computer module of driving control device of the present utility model.
Embodiment
Fig. 2 is the theory diagram of first embodiment of driving control device of the present utility model.As shown in Figure 2, LED driving control device of the present utility model comprises one-chip computer module 100 and at least one the back level functional module 200 that is electrically connected to described one-chip computer module 100.Described one-chip computer module 100 comprises: D/A conversion unit 101 and control signal generating unit 102.The sampling output that this D/A conversion unit 101 is used to be electrically connected to described at least one back level functional module 200 to be receiving the analog sampling signal, and described analog sampling conversion of signals is become digital sampled signal; Control signal generating unit 102 is used to receive described digital sampled signal and generates control signal based on described digital sampled signal and preset strategy.Described at least one back level functional module 200 is electrically connected at least one output of control signal generating unit 102 to receive described control signal and to adjust output voltage and/or LED brightness based on described control signal.
Fig. 3 is the schematic block circuit diagram of second embodiment of driving control device of the present utility model.As shown in Figure 3, this driving control device comprise one-chip computer module 100 and back level functional module 21,22 ..., 2n.This one-chip computer module 100 is AD type single-chip microcomputers, its inner integrated multichannel A/D convertor circuit, multichannel pwm circuit.For example can adopt STC12C5410AD, its inner integrated 8 passage A/D convertor circuits, 4 passage pwm circuits, may command 4 string LED at most.As shown in Figure 3, described back level functional module 21,22 ..., 2n voltage input end VIN receive input voltage respectively.One-chip computer module 100 by a plurality of ISEN1-n pins respectively from back level functional module 21,22, ..., the sampling output of 2n is to receive the analog sampling signal, and described analog sampling conversion of signals become digital sampled signal, generate control signal based on described digital sampled signal and preset strategy subsequently.In the present embodiment, described control signal comprises output voltage control signal and pwm control signal.This output voltage control signal sends back level functional module 21,22 to by pin Gate1-n respectively ..., 2n.This pwm control signal sends back level functional module 21,22 to by pin PWM1-n respectively ..., 2n.In the present embodiment, described preset strategy comprises that when described digital sampled signal during greater than preset value reduce the duty ratio of output voltage control signal, control output voltage reduces; When described digital sampled signal during less than preset value, increase the duty ratio of output voltage control signal, control output voltage increases.In simplified embodiment of the present utility model, this control signal can include only voltage control signal or pwm control signal.According to instruction of the present utility model, those skilled in the art can in the light of actual conditions be provided with the kind of control signal.
In a preferred embodiment of the present utility model; one-chip computer module 100 also can be by a plurality of OVP1-n pins from back level functional module 21; 22; ..., the signal output part of 2n receives the overvoltage signal, and this overvoltage signal and default overvoltage protection threshold value are compared; when this overvoltage signal that receives greater than default overvoltage protection threshold value; this one-chip computer module 100 is carried out interrupt routine, closes this LED channels drive circuit, plays the overvoltage protection effect.
Fig. 4 is the circuit theory diagrams of back level functional module of the 3rd embodiment of driving control device of the present utility model.Below in conjunction with the embodiment shown in Fig. 4 the operation principle of driving control device of the present utility model is described.
As shown in Figure 4, a back level functional module of the present utility model comprises sampling resistor 7, the first transistor 6, boosting unit 11, LED string 10 and Overvoltage protecting unit 12.The voltage input end Vin of described boosting unit 11 is connected to input voltage, signal input end Gate and receives the positive pole that described output voltage control signal, output VOUT are connected to LED string 10, and the source electrode of described the first transistor 6 receives the negative pole that pwm control signal, grid are connected to described LED string 10 through sampling resistor 7 ground connection, drain electrode.The tie point of the source electrode of described sampling resistor 7 and described the first transistor 6 is the sampling output of described back level functional module 200.This overvoltage detecting unit 12 is connected between described output VOUT and the ground.
In this embodiment; described one-chip computer module 100 comprises and turn-offs unit 103 (not shown) that described shutoff unit 103 is connected to the signal output part OVP of described overvoltage detecting unit 12 to receive described overvoltage signal and to generate with the cut-off signals of closing LED string 10 based on described overvoltage signal and default overvoltage protection threshold value.
As shown in the figure, described boosting unit 11 comprises: inductance 1, diode 2, transistor seconds 3, first resistance 4 and electric capacity 5; One end of wherein said inductance 1 is connected to voltage input end Vin, the other end is connected to the anode of described diode 2 and the grid of described transistor seconds 3, the negative electrode of described diode 2 is connected to the positive pole of described output VOUT and electric capacity 5, the minus earth of described electric capacity 5, the source electrode of described transistor seconds 3 is through first resistance, 4 ground connection, drain electrode signal input end Gate.Described Overvoltage protecting unit 12 comprises second resistance 8 and the 3rd resistance 9 that is connected in series between described output VOUT and the ground, and described shutoff unit 103 is connected to the tie point of described second resistance 8 and the 3rd resistance 9 to receive the overvoltage signal.In other embodiment of the present utility model, also can adopt other Overvoltage protecting unit 12, those skilled in the art are familiar with the structure and the use of various Overvoltage protecting units, all can use in the utility model at these various Overvoltage protecting units.In simplified embodiment of the present utility model, also can not comprise Overvoltage protecting unit.
Below in conjunction with Fig. 4 the operation principle of driving control device of the present utility model is described:
Boosting unit 11 is receiving from signal input end Gate under the control of described output voltage control signal, will rise to the setting output voltage at output (VOUT) from the input voltage VIN that voltage input end Vin receives.Described output voltage control signal is the pulse-width signal (pwm signal) that a frequency is hundreds of kHz.This sets the summation of output voltage a little more than the LED forward voltage VF of LED string.
Resistance 4 is current-limiting protection resistance.Resistance 8 and resistance 9 constitute bleeder circuit; partial pressure value OVP=R9*VOUT/ (R8+R9); OVP inputs to the OVP1 pin of one-chip computer module 100; too high as VOUT, when partial pressure value OVP reached " overvoltage protection threshold value ", the shutoff unit (not shown) in the one-chip computer module 100 was carried out interrupt routine; close this LED channels drive circuit, play the overvoltage protection effect.
Resistance 7 is sampling resistors.Sampled voltage inputs to one-chip computer module 100 through the ISEN pin.This one-chip computer module 100 produces output voltage control signal according to following strategy after converting sampled voltage (analogue value) to digital signal.Thereby boosting unit 11 receives this output voltage control signal control output voltage by signal input end Gate.
(when V0 is generally 0.2～1.5V), reduce the duty ratio of output voltage control signal, output voltage VO UT is reduced when sampled voltage surpasses preset value V0; Otherwise, when sampled voltage is lower than preset value V0, increase the duty ratio of output voltage control signal, output voltage VO UT is increased.Through after the above policy control, sampled voltage fluctuates up and down at V0.
Wherein the control flow of one-chip computer module 100 as shown in Figure 5.In step S1, after powering on, set overvoltage protection threshold value Vth, reference voltage Vref.In another embodiment of the present utility model, this overvoltage protection threshold value Vth and reference voltage Vref can be to be stored in earlier in the one-chip computer module, need not to set again.
In step S2, judge that whether partial pressure value OVP is greater than overvoltage protection threshold value Vth.In preferred embodiment of the present utility model, also can be to judge that whether partial pressure value OVP is more than or equal to overvoltage protection threshold value Vth.When judging partial pressure value OVP greater than overvoltage protection threshold value Vth, execution in step S3, otherwise execution in step S5.
In step S3, one-chip computer module 100 is carried out and is interrupted, and closes this channel circuit, then execution in step S4.
In step S4, time-delay 10ms, and return step S2, judge once more, so circulation.In other embodiment of the present utility model, the other times of also can delaying time.
In step S5, judge that the sampled voltage that receives from the ISEN pin whether greater than reference voltage Vref, if execution in step S7 reduces the duty ratio of output voltage control signal, reduces output voltage, return step S2 subsequently, enter circulation.Otherwise execution in step S6, the duty ratio of increase output voltage control signal increases output voltage, returns step S2 subsequently, enters circulation.The degree that increases or reduce is how determined according to actual conditions by those skilled in the art.
Because the mean flow rate of LED string is directly proportional with the duty ratio of pwm control signal, when the duty ratio of pwm control signal was 100%, LED cross luma degree was the highest, and when the duty ratio of pwm control signal was 0, the LED string did not work.The resistance value R of resistance 7 has determined the current value I LED:ILED=Vref/R by the LED string.
Because the pwm control signal of each back level functional module is separate, the luminosity of each LED string is also separate, the sequence of light (phase place) of each LED string also can independently be controlled, can be simultaneously, also can misplace in an orderly manner, these characteristics are particularly useful to liquid crystal display television by using LED-backlit source, can realize " backlight scanning technique ".
Equally, because each back level functional module works alone, the independent parameter of adjusting each module, it is minimum that the electric energy loss of each back level functional module is designed into, and correspondingly, the energy efficiency indexes of product is very high, accomplishes energy-conserving and environment-protective.
In the utility model, the operating voltage of AD type one-chip computer module is 3.3～5V, the withstand voltage of the components and parts in the level functional module of back is VOUT, chooses the enough components and parts of withstand voltage, can obtain the high drive ability of volt more than 100, a slice AD type single-chip microcomputer (for example, STC12C5410AD) can form 4 string LED high-voltage driving circuits, and the price of a slice AD type single-chip microcomputer, a little less than the high-voltage LED drive IC price that can only drive single string, as seen, the utlity model has tangible price advantage.
The utility model is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the utility model scope, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion or the material of the utility model technology, can carry out many modifications and not break away from its protection range the utility model.Therefore, the utility model is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.
Claims (10)
1. a LED driving control device is characterized in that, comprising: one-chip computer module (100) and be electrically connected at least one back level functional module (200) of described one-chip computer module (100);
Wherein said one-chip computer module (100) comprising:
D/A conversion unit (101), the sampling output that is used to be electrically connected to described at least one back level functional module (200) to be receiving the analog sampling signal, and described analog sampling conversion of signals is become digital sampled signal;
Control signal generating unit (102) is used to receive described digital sampled signal and generates control signal based on described digital sampled signal and preset strategy;
Described at least one back level functional module (200) is electrically connected at least one output of control signal generating unit (102) to receive described control signal and to adjust output voltage and/or LED brightness based on described control signal.
2. LED driving control device according to claim 1 is characterized in that described control signal comprises output voltage control signal and pwm control signal.
3. LED driving control device according to claim 2 is characterized in that, described preset strategy comprises that when described digital sampled signal during greater than preset value reduce the duty ratio of output voltage control signal, control output voltage reduces; When described digital sampled signal during less than preset value, increase the duty ratio of output voltage control signal, control output voltage increases.
4. LED driving control device according to claim 3 is characterized in that, described back level functional module (200) comprising: sampling resistor (7), the first transistor (6), boosting unit (11) and LED string (10); Wherein, the voltage input end (Vin) of described boosting unit (11) is connected to input voltage, signal input end (Gate) and receives the positive pole that described output voltage control signal, output (VOUT) are connected to LED string (10), the source electrode of described the first transistor (6) receives the negative pole that pwm control signal, grid are connected to described LED string (10) through sampling resistor (7) ground connection, drain electrode, and the tie point of the source electrode of described sampling resistor (7) and described the first transistor (6) is the sampling output of described back grade functional module (200).
5. LED driving control device according to claim 4 is characterized in that, the brightness of described LED string (10) is directly proportional with the duty ratio of described pwm control signal.
6. LED driving control device according to claim 4 is characterized in that, described boosting unit (11) comprising: inductance (1), diode (2), transistor seconds (3), first resistance (4) and electric capacity (5); One end of wherein said inductance (1) is connected to voltage input end (Vin), the other end is connected to the anode of described diode (2) and the grid of described transistor seconds (3), the negative electrode of described diode (2) is connected to the positive pole of described output (VOUT) and electric capacity (5), the minus earth of described electric capacity (5), the source electrode of described transistor seconds (3) is through first resistance (4) ground connection, and signal input end (Gate) drains.
7. LED driving control device according to claim 4 is characterized in that, described back level functional module (200) further comprises the overvoltage detecting unit (12) that is used to detect the overvoltage signal; Described one-chip computer module (100) comprises and turn-offs unit (103) that described shutoff unit (103) is connected to the signal output part (OVP) of described overvoltage detecting unit (12) to receive described overvoltage signal and to generate with the cut-off signals of closing LED string (10) based on described overvoltage signal and default overvoltage protection threshold value.
8. LED driving control device according to claim 7; it is characterized in that; described Overvoltage protecting unit (12) comprises second resistance (8) and the 3rd resistance (9) that is connected in series between described output (VOUT) and the ground, and described shutoff unit (103) is connected to the tie point of described second resistance (8) and the 3rd resistance (9) to receive the overvoltage signal.
9. LED driving control device according to claim 6 is characterized in that, described the first transistor (6) and transistor seconds (3) are N type metal-oxide-semiconductors, and described diode (2) is a Schottky diode.
10. according to the described LED driving control device of arbitrary claim among the claim 1-9, it is characterized in that described one-chip computer module (100) is a multichannel modulus single-chip microcomputer, all back level functional modules (200) of each passage may command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202053417U CN201550321U (en) | 2009-09-28 | 2009-09-28 | LED driving control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202053417U CN201550321U (en) | 2009-09-28 | 2009-09-28 | LED driving control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201550321U true CN201550321U (en) | 2010-08-11 |
Family
ID=42605504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202053417U Expired - Fee Related CN201550321U (en) | 2009-09-28 | 2009-09-28 | LED driving control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201550321U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074214A (en) * | 2010-12-23 | 2011-05-25 | 上海大学 | Monolithic integrated LED (light emitting diode) backlight and LCD (liquid crystal display) power supply driving system |
| CN102262860A (en) * | 2011-06-13 | 2011-11-30 | 惠州市德赛汽车电子有限公司 | Liquid crystal display and backlight driving device thereof |
| CN103369760A (en) * | 2012-03-26 | 2013-10-23 | 海洋王（东莞）照明科技有限公司 | Lighting-control circuit and lamp |
| CN103747578A (en) * | 2013-12-30 | 2014-04-23 | 深圳市华星光电技术有限公司 | LED (Light-Emitting Diode) backlight driving circuit and liquid crystal display |
| CN104768256A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Synchronous shutdown LED boost driving circuit |
| CN104768259A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Adaptive LED boost driving circuit |
| US9230512B2 (en) | 2013-12-30 | 2016-01-05 | Shenzhen China Star Optoelectronics Technoogy Co., Ltd | LED backlight driving circuit and liquid crystal device |
| CN108320691A (en) * | 2018-03-27 | 2018-07-24 | 苏州佳智彩光电科技有限公司 | A kind of over-current over-voltage protection method and system when the test for OLED screen |
-
2009
- 2009-09-28 CN CN2009202053417U patent/CN201550321U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074214A (en) * | 2010-12-23 | 2011-05-25 | 上海大学 | Monolithic integrated LED (light emitting diode) backlight and LCD (liquid crystal display) power supply driving system |
| CN102262860A (en) * | 2011-06-13 | 2011-11-30 | 惠州市德赛汽车电子有限公司 | Liquid crystal display and backlight driving device thereof |
| CN103369760A (en) * | 2012-03-26 | 2013-10-23 | 海洋王（东莞）照明科技有限公司 | Lighting-control circuit and lamp |
| CN103369760B (en) * | 2012-03-26 | 2016-06-22 | 海洋王（东莞）照明科技有限公司 | A kind of emission control circuit and light fixture |
| CN103747578A (en) * | 2013-12-30 | 2014-04-23 | 深圳市华星光电技术有限公司 | LED (Light-Emitting Diode) backlight driving circuit and liquid crystal display |
| US9230512B2 (en) | 2013-12-30 | 2016-01-05 | Shenzhen China Star Optoelectronics Technoogy Co., Ltd | LED backlight driving circuit and liquid crystal device |
| CN104768256A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Synchronous shutdown LED boost driving circuit |
| CN104768259A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Adaptive LED boost driving circuit |
| CN104768259B (en) * | 2014-01-02 | 2018-12-11 | 深圳市海洋王照明工程有限公司 | Adaptive LED booster driving circuit |
| CN104768256B (en) * | 2014-01-02 | 2019-04-12 | 深圳市海洋王照明工程有限公司 | Synchronous shutdown LED booster driving circuit |
| CN108320691A (en) * | 2018-03-27 | 2018-07-24 | 苏州佳智彩光电科技有限公司 | A kind of over-current over-voltage protection method and system when the test for OLED screen |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201550321U (en) | LED driving control device | |
| CN201995158U (en) | LED lamp string circuit comprising long LED lamp string composed of a plurality of short LED lamp strings | |
| CN102223747B (en) | PWM dimming LED driver and driving method thereof | |
| KR20060119018A (en) | Dc-dc convertor having over-voltage/over-current protection function and led driving circuit comprising the same | |
| CN202404873U (en) | Constant voltage and constant current drive circuit of LED display screen | |
| CN101848577A (en) | LED driving system and driving method | |
| CN102711321A (en) | Light emitting diode driving circuit | |
| CN101179879A (en) | Luminous device and driving circuit | |
| CN102833916B (en) | DC (direct current) dimming type LED (Light Emitting Diode) drive circuit | |
| CN105093598B (en) | Array base palte row drives short-circuit protection circuit and liquid crystal panel | |
| CN104768265A (en) | High-power LED constant-current driving circuit | |
| CN103280191A (en) | LED (light-emitting diode) backlight driving circuit, LCD (liquid crystal display) device and driving method | |
| CN102769981A (en) | Intelligent constant-current driver realized by embedded chip and control method of intelligent constant-current driver | |
| CN201928475U (en) | Singlechip integrated circuit with boosting and stepping functions for driving high-power LED lamp | |
| CN202907295U (en) | DC-to-DC constant-current driving circuit | |
| CN202907294U (en) | DC-to-DC constant-current driving circuit | |
| CN202514136U (en) | Light emitting diode (LED) driving chip capable of dimming and driving circuit | |
| CN202268152U (en) | Backlight constant-current and constant-voltage driving circuit for display screen | |
| CN101600277B (en) | LED circuit | |
| CN102740540A (en) | Light emitting diode driving system | |
| CN205160851U (en) | Two unification powers | |
| CN100546420C (en) | Light source driving circuit | |
| CN1909347A (en) | Output voltage adjustable dc-dc conversion circuit | |
| US20120235596A1 (en) | Led drivers with audible noise elimination and associated methods | |
| CN201533429U (en) | LED drive control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20100811 Termination date: 20120928 |