CN101409967A - Multipath LED drive circuit - Google Patents
Multipath LED drive circuit Download PDFInfo
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- CN101409967A CN101409967A CNA2008102172191A CN200810217219A CN101409967A CN 101409967 A CN101409967 A CN 101409967A CN A2008102172191 A CNA2008102172191 A CN A2008102172191A CN 200810217219 A CN200810217219 A CN 200810217219A CN 101409967 A CN101409967 A CN 101409967A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention relates to a multi-passage LED driving circuit, comprising an exact current source (30) which can provide exact current, a multi-passage mirror amplification module (40) which is used for amplifying the exact current and copies the amplified current to multi-passage output, and an active output-step (34) which can precisely regulate each passage of output. The embodiment of the multi-passage LED driving circuit can drive the multi-passage LED by one passage of prearranged bias current only, thus saving the power dissipation and having high current conversion efficiency; each passage of output current is independently detected and adjusted, the output current has high match precision, and the active output step structure has large output resistance and strong anti-interference capability.
Description
Technical field
The present invention relates to drive circuit, more particularly, relate to a kind of multipath LED drive circuit.
Background technology
The performance of light-emitting diode (LED) in information display system, portable set backlight are used is obvious to all.Grow to even greater heights at energy-conserving and environment-protective technology cry, LED illumination becomes main flow bright and clear day by day today, the topic that the LED Driving technique receives much attention especially and pursues.Increasing strength drops into this Study on Technology, competes also more and more fierce.
Wherein, the extensive employing of large LED display screen requires drive circuit can drive the LED of greater number, and often the mode with single channel series connection, multi-channel parallel and chip chamber cascade realizes.The multichannel led driver spare of this class, except the switch performance that complicated logical sequence, high speed are arranged requires, key is to provide the constant current of a plurality of paths to come the driven for emitting lights diode, in order to satisfy the requirement of large-screen uniformity of luminance and white balance, must guarantee each road drive current basically identical, reach higher currents match precision.
Existing conventional LED multi-path drives generally to be realized by simple current mirror, as Fig. 1 example, default bias current sources 10 provides electric current to pour into current mirror mirror image pipe 11, produce grid source drive voltage signal, offer the grid of output driving tube 12, utilize simple current mirror replication relation, the wide long size ratio of driving tube 12 and mirror image pipe 11 is set, just can obtain amplified current with the driven for emitting lights diode (LED).Yet this simple current mirror mode can not realize the high-precision current coupling, and need expend the default bias current IB of multichannel, and power consumption is bigger, and current conversion efficient is low.
Another drive circuit commonly used is provided by Fig. 2 example, and with respect to simple current mirror, it is equivalent to increase active grid common source (active cascode) structure altogether for 10 times in default bias current sources.Utilize the drain-source voltage clamper of operational amplifier 20 with mirror image pipe 11 and driving tube 12, operational amplifier 20 outputs provide the gate source voltage of driving tube through adjusting pipe 21, and the formation negative feedback loop is kept system stability.Because the gate source voltage of mirror image pipe 11 and driving tube 12 all equates with drain-source voltage, so the output current precision increases.Yet the shortcoming of this circuit is fairly obvious also, 20 detections of operational amplifier are the drain-source voltage signal of one road driving tube wherein, for other N-1 road output currents, do not regulated and control accurately, and be subjected to the influence of problems such as driving tube 12 not matching in the technology implementation procedure, light-emitting diode self performance difference more serious, cause not of uniform size the causing of drive current of each road output; In addition, the output resistance of driving tube 12 is less, is subject to the interference of external power source fluctuation.Therefore still can not satisfy the requirement of high accuracy matching current.
Therefore, need a kind of can the drain-source voltage signal of each path the detection and output current be regulated and control separately to reach the multipath LED drive circuit of high-precision current matching.
Summary of the invention
The technical problem to be solved in the present invention is, can't carry out the defective of accuracy controlling to other N-1 road output current at the drain-source voltage signal that only detects one road driving tube wherein of prior art, providing a kind of can detect the drain-source voltage signal of each path and output current be regulated and control separately to reach the multipath LED drive circuit of high-precision current matching.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of multipath LED drive circuit, comprise the accurate current source that is used to provide accurate electric current, be used for described accurate electric current is amplified and copies to the multichannel mirror image amplification module of multichannel output, wherein, also comprise the active output stage that is used for each road output is carried out accuracy controlling.
In multipath LED drive circuit of the present invention, described active output stage comprises a plurality of output operational amplifier op and a plurality of active efferent duct MNC, the positive input of described a plurality of output operational amplifier op all is connected to source electrode, the output that described accurate current source, reverse input end be connected respectively to the multichannel drive output of described multichannel mirror image amplification module and described a plurality of active efferent duct MNC and links to each other with the grid of described a plurality of active efferent duct MNC respectively, and the drain electrode of described a plurality of active efferent duct MNC is powered to LED multi-path respectively.
In multipath LED drive circuit of the present invention, described accurate current source comprises current mirror, first operational amplifier and the first electric current adjustment pipe, the drain electrode of the first current mirror mirror image pipe MP1 of wherein said current mirror is connected to the positive input of default bias supply and described first operational amplifier, the drain electrode of the second current mirror mirror image pipe MP2 is connected to the reverse input end of described operational amplifier and the source electrode that described first electric current is adjusted pipe, the output of described first operational amplifier is connected to the grid that described first electric current is adjusted pipe, and the drain electrode of described first electric current adjustment pipe is connected to the positive input of described multichannel mirror image amplification module and described a plurality of operational amplifiers.
In multipath LED drive circuit of the present invention, described multichannel mirror image amplification module comprises mirror image pipe, multichannel driver element and second operational amplifier, wherein, described multichannel driver element comprises a plurality of driving tube MNB, and the source ground of described a plurality of driving tube MNB, drain electrode are connected respectively to the reverse input end of described a plurality of output operational amplifier op and the source electrode of described a plurality of active efferent duct MNC;
The drain electrode of described mirror image pipe is connected respectively to the drain electrode that described first electric current is adjusted pipe, the source ground of described mirror image pipe, grid are connected to the output of described second operational amplifier and the grid of described a plurality of driving tube MNB, and the reverse input end of described second operational amplifier connects the positive input that reference voltage Vref, positive input are connected to described a plurality of output operational amplifier op.
In multipath LED drive circuit of the present invention, recently amplify the drain electrode output current of multichannel driver element by the length and width of regulating mirror image pipe and described multichannel driver element.
In multipath LED drive circuit of the present invention, described a plurality of driving tube MNB, the described first current mirror mirror image pipe MP1, the second current mirror mirror image pipe MP2 and/or described a plurality of active efferent duct MNC are the MOS transistor npn npns.
In multipath LED drive circuit of the present invention, described a plurality of driving tube MNB, the described first current mirror mirror image pipe MP1, the second current mirror mirror image pipe MP2 and/or described a plurality of active efferent duct MNC are the BIPOLAR transistor npn npns.
Implement of the present inventionly only can drive the multichannel light-emitting diode, save power consumption, current conversion efficient height with one tunnel default bias current; Each road output current has all obtained independent detection and adjusting, output current matching precision height; Active output stage structure, output resistance is big, and antijamming capability is strong.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is conventional simple current mirror drive circuit figure;
Fig. 2 is another existing conventional drive circuit figure;
Fig. 3 is the logic diagram of first embodiment of multipath LED drive circuit of the present invention;
Fig. 4 is the circuit diagram of second embodiment of multipath LED drive circuit of the present invention.
Embodiment
Fig. 3 is the logic diagram of first embodiment of multipath LED drive circuit of the present invention.It shows a kind of multipath LED drive circuit, comprise the accurate current source 30 that is used to provide accurate electric current, be used for described accurate electric current is amplified and copies to the multichannel mirror image amplification module 40 of multichannel output, wherein, also comprise the active output stage 34 that is used for each road output is carried out accuracy controlling.
Fig. 4 is the circuit diagram of second embodiment of multipath LED drive circuit of the present invention.As shown in Figure 4, what the electric current I B that default bias current sources 10 provides reflected is the size of output driving current, and precisely current source 30 accurately is mirrored to output channel with it.The clamping action of first operational amplifier 31 makes first current mirror mirror image pipe MP1 of current mirror and the drain voltage of the second current mirror mirror image pipe MP2 equate, makes electric current accurately be duplicated.The output of first operational amplifier 31 is connected to the grid of the first electric current adjustment pipe 32, provides negative feedback loop to regulate the drain voltage of the second current mirror mirror image pipe MP2.The existence of first operational amplifier 31 and the first electric current adjustment pipe 32 makes that the output resistance of accurate current source 30 is bigger, has guaranteed the image current precision.
By adjusting the breadth length ratio that mirror image pipe 11 and output driving tube MNB 1 output driving tube MNB 12 arrive, can obtain suitable IB to be carried out the multiple amplified current, with the driven for emitting lights diode.For output driving tube MNB,, be necessary for it gate voltage signal and drain voltage signal of adjusting mirror image pipe 11 is provided in order to reach the accurate mirror image and the amplification of electric current.
The present invention adopts second operational amplifier 33 to realize above-mentioned functions, and its reverse input end is reference voltage signal Vref, and the clamping action of second operational amplifier 33 is fixed the drain voltage of mirror image pipe 11, and provides to active output stage 34 as output.Under the operating state that default bias current IB varies in size, the gate voltage signal of mirror image pipe 11 is regulated in 33 outputs of second operational amplifier automatically, and provide to the grid of output driving tube MNB as output, promptly the grid of all driving tubes of multichannel driver element 12 is all driven simultaneously by this signal.Utilize these two voltage signals can drive a plurality of output channels simultaneously, promptly realized only driving multichannel output with one tunnel default bias current.
Because exist multichannel output, the operating state on each road there are differences, the influence in layout design and physics realization process, the individual difference of LED itself also can cause matching degree variation between each bar path.If only detecting wherein the operating state of an output channel comes the output current of all paths is regulated, in fact the path that is not detected is not so not only regulated and control accurately, even may cause the mistuning control opposite with actual conditions, so the currents match degree between the path is relatively poor.
In order to realize that the present invention introduces active output stage 34 at each output channel to the accuracy controlling of each road output.Wherein, described active output stage 34 comprises a plurality of output operational amplifier op and a plurality of active efferent duct MNC, the positive input of described a plurality of output operational amplifier op all is connected to source electrode, the output that described accurate current source 30, reverse input end be connected respectively to the multichannel drive output of described multichannel mirror image amplification module 40 and described a plurality of active efferent duct MNC and links to each other with the grid of described a plurality of active efferent duct MNC respectively, and the drain electrode of described a plurality of active efferent duct MNC is powered to LED multi-path respectively.Because the existence of output operational amplifier op, the drain voltage of each road output driving tube MNB can both be consistent with the drain voltage of mirror image pipe 11.In conjunction with the output signal of second operational amplifier 33, i.e. the grid of each road output driving tube MNB is driven by same mirror image pipe 11 signals, and the drain voltage signal of each road driving tube MNB then is consistent with the drain voltage of mirror image pipe 11 respectively.Because the independent detection of each road output all carrying out, and by output operational amplifier op and active efferent duct MNC formation negative feedback loop, drain voltage of each output driving tube MNB is regulated and control separately, the currents match degree between each path therefore improved.The transistor drain voltage of supposing wherein any one tunnel output output driving tube MNBn is Δ V with the error of the drain voltage of adjusting pipe 11
ERR(n) (n represents the output of n road), then error signal obtains amplifying and adjusting by active output stage 34.Wherein output operational amplifier opn detects output driving tube MNBn drain voltage signal, and gain A is provided
V(n), active efferent duct MNCn is as adjusting pipe, and source electrode is an output, then finally can obtain adjusting voltage signal in the drain electrode of output driving tube MNBn:
Herein of particular note, the normal pressure MOS transistor that active efferent duct MNCn is not necessarily conventional can also replace with high voltage bearing transistor device, to satisfy the requirement of high-voltage applications, and under the special process process conditions,, may in following formula, introduce g if serving as a contrast inclined to one side effect can not eliminate
Mb(MNCn) deviation.By the can visually see effect of active output stage 34 of following formula: for different n road output, error signal is impossible identical, this moment, system made the output final adjustment voltage signal that obtains in n road only relevant with itself detected this road error signal, and strictness is corresponding one by one.Realized the independent detection of multichannel output and regulation and control separately with this, the currents match degree be improved significantly.
And, because active output stage 34 is cascodes, having increased output resistance, the meeting that influences that is caused by power-supply fluctuation or light-emitting diode difference is shielded by transistor MNC, has guaranteed the output current precision.
In another embodiment of the present invention, all available BIPOLAR transistor npn npn of MOS transistor npn npn is replaced arbitrarily, yet considers the increase of chip area and cost, and the application of BIPOLAR transistor npn npn is restricted, and embodiment is repeated no more herein.
Though the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claim scope of the present invention.
Claims (7)
1, a kind of multipath LED drive circuit, comprise the accurate current source (30) that is used to provide accurate electric current, be used for described accurate electric current is amplified and copies to the multichannel mirror image amplification module (40) of multichannel output, it is characterized in that, also comprise the active output stage (34) that is used for each road output is carried out accuracy controlling.
2, multipath LED drive circuit according to claim 1, it is characterized in that, described active output stage (34) comprises a plurality of output operational amplifier op and a plurality of active efferent duct MNC, the positive input of described a plurality of output operational amplifier op all is connected to described accurate current source (30), reverse input end is connected respectively to the multichannel drive output of described multichannel mirror image amplification module (40) and the source electrode of described a plurality of active efferent duct MNC, output links to each other with the grid of described a plurality of active efferent duct MNC respectively, and the drain electrode of described a plurality of active efferent duct MNC is powered to LED multi-path respectively.
3, multipath LED drive circuit according to claim 2, it is characterized in that, described accurate current source (30) comprises current mirror (301), first operational amplifier (31) and the first electric current adjustment pipe (32), the drain electrode of the first current mirror mirror image pipe MP1 of wherein said current mirror (301) is connected to the positive input of default bias supply (10) and described first operational amplifier (31), the drain electrode of the second current mirror mirror image pipe MP2 is connected to the reverse input end of described operational amplifier (31) and the source electrode of the described first electric current adjustment pipe (32), the output of described first operational amplifier (31) is connected to the grid of the described first electric current adjustment pipe (32), and the drain electrode of the described first electric current adjustment pipe (32) is connected to the positive input of described multichannel mirror image amplification module (40) and described a plurality of operational amplifiers.
4, multipath LED drive circuit according to claim 3, it is characterized in that, described multichannel mirror image amplification module (40) comprises mirror image pipe (11), multichannel driver element (12) and second operational amplifier (33), wherein, described multichannel driver element (12) comprises a plurality of driving tube MNB, and the source ground of described a plurality of driving tube MNB, drain electrode are connected respectively to the reverse input end of described a plurality of output operational amplifier op and the source electrode of described a plurality of active efferent duct MNC;
The drain electrode of described mirror image pipe (11) is connected respectively to the drain electrode of the described first electric current adjustment pipe (32), source ground, the grid of described mirror image pipe (11) is connected to the output of described second operational amplifier (33) and the grid of described a plurality of driving tube MNB, and the reverse input end of described second operational amplifier (32) connects the positive input that reference voltage Vref, positive input are connected to described a plurality of output operational amplifier op.
5, multipath LED drive circuit according to claim 3 is characterized in that, recently amplifies the drain electrode output current of multichannel driver element (12) by the length and width of regulating mirror image pipe (11) and described multichannel driver element (12).
6, according to the described multipath LED drive circuit of arbitrary claim among the claim 1-5, it is characterized in that described a plurality of driving tube MNB, the described first current mirror mirror image pipe MP1, the second current mirror mirror image pipe MP2 and/or described a plurality of active efferent duct MNC are the MOS transistor npn npns.
7, according to the described multipath LED drive circuit of arbitrary claim among the claim 1-5, it is characterized in that described a plurality of driving tube MNB, the described first current mirror mirror image pipe MP1, the second current mirror mirror image pipe MP2 and/or described a plurality of active efferent duct MNC are the BIPOLAR transistor npn npns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810217219A CN100584135C (en) | 2008-11-03 | 2008-11-03 | Multi-path LED drive circuit |
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| CN200810217219A CN100584135C (en) | 2008-11-03 | 2008-11-03 | Multi-path LED drive circuit |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014544A (en) * | 2010-07-13 | 2011-04-13 | 深圳市航嘉驰源电气股份有限公司 | LED (Light-Emitting Diode) lamp driving circuit |
| CN102065596A (en) * | 2009-11-12 | 2011-05-18 | 冠捷投资有限公司 | Driving device for light emitting diode backlight |
| CN102065599A (en) * | 2009-11-12 | 2011-05-18 | 点晶科技股份有限公司 | Multi-channel current driver |
| CN102256418A (en) * | 2011-07-15 | 2011-11-23 | 深圳市华星光电技术有限公司 | PWM (pulse width modulation) dimming circuit |
| CN102395234A (en) * | 2011-11-02 | 2012-03-28 | 帝奥微电子有限公司 | Low voltage CMOS constant current source circuit with high matching degree |
| CN102622957A (en) * | 2011-02-01 | 2012-08-01 | 北京大学 | Multichannel LED constant current source driving circuit based on MOSFET of linear region with constant grid voltage |
| CN102622958A (en) * | 2011-02-01 | 2012-08-01 | 北京大学 | Local matching-based multichannel LED constant current source driving circuit |
| US8760076B2 (en) | 2011-07-15 | 2014-06-24 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | PWM dimming circuit with multiple outputting paths of current for multiple LED strings |
| TWI470391B (en) * | 2012-06-04 | 2015-01-21 | Issc Technologies Corp | Current regulation circuit and electronic device thereof |
| CN105261327A (en) * | 2015-10-08 | 2016-01-20 | 俞德军 | Digital adjustable constant-current driving circuit |
| CN106028518A (en) * | 2016-06-14 | 2016-10-12 | 上海芯迈科技有限公司 | LED linear drive topology |
| CN107643783A (en) * | 2017-10-09 | 2018-01-30 | 东莞市翔实信息科技有限公司 | Unmanned electric light driving constant-current circuit, integrated circuit and control system |
| CN108132394A (en) * | 2017-11-28 | 2018-06-08 | 上海芯导电子科技有限公司 | A kind of micro-loading automatic detection circuit |
| CN108848594A (en) * | 2018-07-11 | 2018-11-20 | 上海艾为电子技术股份有限公司 | A kind of LED drive circuit and LED multi-path luminescent system |
| CN111918451A (en) * | 2020-08-11 | 2020-11-10 | 英麦科（厦门）微电子科技有限公司 | Multi-path LED active drive matching circuit |
| CN110139434B (en) * | 2019-05-23 | 2021-08-27 | 上海艾为电子技术股份有限公司 | Driving circuit and driving method |
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2008
- 2008-11-03 CN CN200810217219A patent/CN100584135C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102065596A (en) * | 2009-11-12 | 2011-05-18 | 冠捷投资有限公司 | Driving device for light emitting diode backlight |
| CN102065599A (en) * | 2009-11-12 | 2011-05-18 | 点晶科技股份有限公司 | Multi-channel current driver |
| CN102014544A (en) * | 2010-07-13 | 2011-04-13 | 深圳市航嘉驰源电气股份有限公司 | LED (Light-Emitting Diode) lamp driving circuit |
| CN102622957B (en) * | 2011-02-01 | 2014-07-02 | 北京大学 | Multichannel LED constant current source driving circuit based on MOSFET of linear region with constant grid voltage |
| CN102622957A (en) * | 2011-02-01 | 2012-08-01 | 北京大学 | Multichannel LED constant current source driving circuit based on MOSFET of linear region with constant grid voltage |
| CN102622958A (en) * | 2011-02-01 | 2012-08-01 | 北京大学 | Local matching-based multichannel LED constant current source driving circuit |
| CN102622958B (en) * | 2011-02-01 | 2014-09-24 | 北京大学 | Local matching-based multichannel LED constant current source driving circuit |
| CN102256418B (en) * | 2011-07-15 | 2014-02-19 | 深圳市华星光电技术有限公司 | PWM (pulse width modulation) dimming circuit |
| US8760076B2 (en) | 2011-07-15 | 2014-06-24 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | PWM dimming circuit with multiple outputting paths of current for multiple LED strings |
| CN102256418A (en) * | 2011-07-15 | 2011-11-23 | 深圳市华星光电技术有限公司 | PWM (pulse width modulation) dimming circuit |
| CN102395234A (en) * | 2011-11-02 | 2012-03-28 | 帝奥微电子有限公司 | Low voltage CMOS constant current source circuit with high matching degree |
| CN102395234B (en) * | 2011-11-02 | 2013-11-13 | 帝奥微电子有限公司 | Low voltage CMOS constant current source circuit with high matching degree |
| TWI470391B (en) * | 2012-06-04 | 2015-01-21 | Issc Technologies Corp | Current regulation circuit and electronic device thereof |
| CN105261327A (en) * | 2015-10-08 | 2016-01-20 | 俞德军 | Digital adjustable constant-current driving circuit |
| CN105261327B (en) * | 2015-10-08 | 2018-12-25 | 俞德军 | Digital form adjustable constant-flow driving circuit |
| CN106028518A (en) * | 2016-06-14 | 2016-10-12 | 上海芯迈科技有限公司 | LED linear drive topology |
| CN106028518B (en) * | 2016-06-14 | 2017-12-19 | 上海芯迈科技有限公司 | A kind of LED linear driving topology |
| CN107643783A (en) * | 2017-10-09 | 2018-01-30 | 东莞市翔实信息科技有限公司 | Unmanned electric light driving constant-current circuit, integrated circuit and control system |
| CN108132394A (en) * | 2017-11-28 | 2018-06-08 | 上海芯导电子科技有限公司 | A kind of micro-loading automatic detection circuit |
| CN108848594A (en) * | 2018-07-11 | 2018-11-20 | 上海艾为电子技术股份有限公司 | A kind of LED drive circuit and LED multi-path luminescent system |
| CN110139434B (en) * | 2019-05-23 | 2021-08-27 | 上海艾为电子技术股份有限公司 | Driving circuit and driving method |
| CN111918451A (en) * | 2020-08-11 | 2020-11-10 | 英麦科（厦门）微电子科技有限公司 | Multi-path LED active drive matching circuit |
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Effective date of registration: 20130603 Address after: 214029, B1, building 999, No. 9 East high wave road, Binhu District, Jiangsu, Wuxi Patentee after: Wuxi Chip Hope Micro-Electronics Ltd. Address before: 518057, 4B, 29 south, 6 South Road, science and technology zone, Guangdong, Shenzhen Patentee before: Shenzhen Land Hope Micro-electronics Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100120 Termination date: 20171103 |