CN102291901A - Driving circuit and driving device for light emitting diode (LED) array - Google Patents
Driving circuit and driving device for light emitting diode (LED) array Download PDFInfo
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- CN102291901A CN102291901A CN2011102872580A CN201110287258A CN102291901A CN 102291901 A CN102291901 A CN 102291901A CN 2011102872580 A CN2011102872580 A CN 2011102872580A CN 201110287258 A CN201110287258 A CN 201110287258A CN 102291901 A CN102291901 A CN 102291901A
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Abstract
The invention provides a driving circuit for a light emitting diode (LED) array, which comprises a switch module, a driving module and a dimming module, wherein the switch module is connected to a main board, generates switch signals through main board signals and outputs the switch signals to the driving module, the driving module is connected to the switch module and the dimming module and sends driving signals to the dimming module under the control of the switch signals from the switch module, the dimming module is connected to the LED array, receives the driving signals from the driving module, generates dimming signals and sends the dimming signals to the LED array, and the driving module comprises a power factor correction (PFC) driving chip, a launch control (LC) driving chip and/or a flyback control chip. Correspondingly, the invention also provides a driving device for the LED array. Through the technical scheme of the invention, an ordinary driving chip and a peripheral circuit can be used for replacing a special LED driving chip, so the production cost is reduced when a good realization effect is realized.
Description
Technical field
The present invention relates to the LED Driving technique, in particular to the drive circuit and the drive unit of led array.
Background technology
Present LED Driving technique is to boost through BOOST to realize mostly, concrete mode as Fig. 1, use special-purpose LED chip for driving 102 to realize the constant current of led array 104 is designed, two secondary LED chip for driving etc., component number is many, poor reliability, and special-purpose LED chip for driving 102 belongs to different producers, poor compatibility, (price of the special-purpose LED chip for driving 102 of general single channel is all more than 2 yuan) on the high side are unfavorable for large-scale promotion and application.
Therefore, need a kind of new LED Driving technique, can be with the LED chip for driving of common chip for driving and peripheral circuit instead of dedicated, thus when realization realizes effect preferably, reduce production costs.
Summary of the invention
In order one of to solve the problems of the technologies described above at least, the invention provides the Driving technique of a kind of LED, can be with the LED chip for driving of common chip for driving and peripheral circuit instead of dedicated, thus when realizing realizing effect preferably, reduce production costs.
In view of this, the present invention proposes a kind of drive circuit of led array, comprising: switch module, be connected to mainboard, be used to generate switching signal, and export described switching signal to driver module from the mainboard signal of described mainboard; Described driver module is connected to described switch module and light-adjusting module, under the control from the described switching signal of described switch module, sends drive signal to described light-adjusting module; Described light-adjusting module, be connected to described led array, receive described drive signal, produce dim signal from described driver module, and described dim signal is sent to described led array, wherein said driver module comprises PFC chip for driving, LC chip for driving and/or instead swashs control chip.In this technical scheme, driver module can be the circuit that simple components and parts are built, also can be other integrated chips that are different from special-purpose LED chip for driving, as PFC chip for driving, LC chip for driving or instead swash control chip etc., by this driver module and peripheral circuit such as above-mentioned switch module, light-adjusting module etc., thereby can realize effective driving to led array.The switch module here is used to from the signal of mainboard driver module be controlled, and the mainboard signal here can be for as the mainboard pwm signal.
According to another aspect of the invention, also propose a kind of drive unit of led array, comprised the drive circuit of the led array described in above-mentioned technical scheme.In this technical scheme, by using the drive circuit of above-mentioned led array, and be integrated in this drive unit, thereby can when removing the special LED chip for driving from, still can realize effectively driving led array, reduce production costs.
Description of drawings
Fig. 1 shows the circuit diagram of drive circuit in the correlation technique;
Fig. 2 A shows the block diagram of the drive circuit of led array according to an embodiment of the invention;
Fig. 2 B shows the block diagram of the multi-channel driver circuit of led array according to an embodiment of the invention;
Fig. 3 shows the block diagram of driver module according to an embodiment of the invention;
Fig. 4 shows the circuit diagram of drive circuit according to an embodiment of the invention;
Fig. 5 A shows the circuit diagram of drive circuit according to an embodiment of the invention;
Fig. 5 B shows the circuit diagram of drive circuit according to an embodiment of the invention;
Fig. 6 shows the block diagram of drive unit according to an embodiment of the invention; And
Fig. 7 shows the block diagram of display unit according to an embodiment of the invention.
Embodiment
In order more to be expressly understood above-mentioned purpose of the present invention, feature and advantage, the present invention is further described in detail below in conjunction with the drawings and specific embodiments.
Set forth a lot of details in the following description so that fully understand the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
Fig. 2 shows the block diagram of the drive circuit of led array according to an embodiment of the invention.
Shown in Fig. 2 A, the drive circuit 200 of led array comprises according to an embodiment of the invention: switch module 202, be connected to mainboard, and be used to generate switching signal, and export switching signal to driver module 204 from the mainboard signal of mainboard; Driver module 204, be connected to switch module 202 and light-adjusting module 206, under control from the switching signal of switch module 202, send drive signals to light-adjusting module 206, wherein said driver module comprises PFC chip for driving, LC chip for driving and/or instead swashs control chip; Light-adjusting module 206 is connected to led array, receives the drive signal from driver module 204, produces dim signal, and dim signal is sent to led array; Current sample module 208, be connected to driver module 204 and led array, driving voltage to led array is sampled, and the sampled voltage that obtains transferred to driver module 204, regulate drive signal by the voltage-regulation unit in the driver module 204 according to sampled voltage, dim signal correspondingly changes under the adjusting of drive signal, to keep the current constant of led array; Integral processing module 210, be connected to current sample module 208 and driver module 204, sampled voltage from current sample module 208 is carried out proportional integral to be handled, and the proportional integral signal that obtains transferred to voltage revision unit in the driver module 204, the signal attribute of drive signal is revised according to the proportional integral signal by voltage revision unit, wherein signal attribute comprises phase place, gain; First protection module 212, be connected to the driver module 204 and first power supply, first power source voltage is sampled, and the sampling supply voltage that will obtain inputs to second comparing unit in the driver module 204, second comparing unit supply voltage of will sampling compares with default second threshold value, during greater than second threshold value, second comparing unit sends stop signal to output unit at the sampling supply voltage, and then output unit stops output drive signal; Second protection module 214, be connected to driver module 204 and led array, both end voltage to led array is sampled, the LED voltage and the 3rd threshold value that collect are compared, and at LED voltage during greater than the 3rd threshold value, receiving element in driver module 204 sends guard signal, receiving element is sent to first comparing unit with guard signal, and first comparing unit guard signal and first threshold are compared, at guard signal during greater than first threshold, make first comparing unit send stop signal to output unit, then output unit stops output drive signal; Negative pressure module 216 is connected to led array, when a plurality of led array series connection forming array string, applies positive voltage at an end of array strings, and applies negative voltage at the other end of described array strings, comes array strings is driven.In this technical scheme, driver module can be the circuit that simple components and parts are built, also can be other integrated chips that are different from special-purpose LED chip for driving, as PFC chip for driving, LC chip for driving or instead swash control chip etc., by this driver module and peripheral circuit such as above-mentioned switch module, light-adjusting module etc., thereby can realize effective driving to led array.The switch module here is used to from the signal of mainboard driver module be controlled, and the mainboard signal here can be for as the mainboard pwm signal.
In technique scheme, switch module 202 comprises: first switch element and threshold cell, wherein, first switch element is connected to mainboard, reception is from the described mainboard signal of mainboard, and according to mainboard voltage of signals size, to threshold cell output correspondent voltage, threshold cell is under the effect of this voltage, to driver module 204 output switching signals.
In technique scheme, first switch element comprises first triode, threshold cell comprises first diode, wherein, the base stage pin of first triode is connected to mainboard, reception is from the mainboard signal of mainboard, the collector electrode pin of first triode is connected to the reference voltage unit of driver module 204 and first pin of first diode, reference voltage unit provides reference voltage, and the emitter pin ground connection of first triode, and second pin of first diode is connected to driver module 204, receiving element transmit button signal to driver module 204, receiving element is sent to first comparing unit with the switching signal that receives, first comparing unit with switching signal and presetting first threshold relatively, during greater than first threshold, the output unit of first comparing unit in driver module 204 sends the transmission signal in switching signal, after output unit receives and sends signal, send drive signal to light-adjusting module 206.In this technical scheme, when the mainboard signal is high level, the conducting under this mainboard signal effect of first triode, after then this mainboard signal is exaggerated, the breakdown voltage threshold that surpasses first diode, the reverse conducting of first diode, then send the switching signal of " conducting " to the receiving element of driver module 204, receiving element is sent to first comparing unit with this switching signal, first comparing unit compares this switching signal and first threshold, such as first threshold herein is 1V, and promptly when switching signal during less than 1V, then first comparing unit sends a signal to output unit with transmission, by the output unit output drive signal, light-adjusting module 206 receives this drive signal, and sends dim signal to led array, realizes the driving to led array; And when the mainboard signal is low level, first triode ends, the reference voltage that is connected by the collector electrode pin of first triode exports first diode to, this voltage is less than first diode, then the first diode place path ends, send the switching signal of " ending " to the receiving element of driver module 204, then through first comparing unit relatively after, driver module 204 ends, light-adjusting module 206 stops to export dim signal, then led array quits work, and under the high level and low level effect of aforesaid mainboard signal, realizes the light modulation to led array.
In technique scheme, switch module 202 also comprises: the 3rd resistance, the 4th resistance, the 5th resistance and first filter circuit, wherein, first pin of the 3rd resistance is connected to mainboard, and second pin of the 3rd resistance is connected to the base stage pin of first triode, the 3rd resistance will be sent to first triode from the mainboard signal of mainboard, and this mainboard signal is carried out current limliting, prevent that first triode is damaged; First pin of the 4th resistance is connected to second pin of the 3rd resistance, and the second pin ground connection of the 4th resistance, and the 4th resistance and the 3rd resistance carry out voltage division processing to the mainboard signal; The 5th resistance is connected between the collector electrode pin of the reference voltage unit and first triode, is used for current limliting; First filter circuit is used for the collector electrode pin of first triode is carried out filtering, and first filter circuit here can be realized by electric capacity.
In technique scheme, light-adjusting module 206 comprises: the NMOS pipe, the grid pin of NMOS pipe is connected to the output unit of driver module 204, receive drive signal, the source electrode pin ground connection of NMOS pipe, and the drain pin of NMOS pipe is connected to led array, and when the output unit output drive signal of driver module 204, NMOS manages conducting and sends dim signal to led array.In this technical scheme, between the output unit and light-adjusting module 206 of driver module 204, can also add the 6th resistance, be used for current limliting.In addition, the NMOS pipe for herein it should be appreciated by those skilled in the art that every components and parts or circuit or the device etc. that can realize similar on-off action as triode, PMOS pipe, switching circuit etc., all can be used for herein.
In technique scheme, current sample module 208 comprises: the 7th resistance, first pin of the 7th resistance is connected to the voltage-regulation unit in led array and the driver module 204, and the second pin ground connection of the 7th resistance, here by the 7th resistance the driving voltage of led array is sampled, understand the real-time condition of led array, and when changing, sampled voltage makes real-time adjustment by the voltage-regulation unit, make led array under the certain situation of self resistance, kept constant current, be damaged otherwise the not enough even led array of colour cast, brightness can occur.
In technique scheme, integral processing module 210 comprises: first resistance, second resistance and first electric capacity, wherein, first pin of first resistance is connected to current sample module 208, reception is from the sampled voltage of current sample module 208, and second pin of first resistance is connected to first pin of first electric capacity; First pin of second resistance is connected to first pin of first resistance, and second pin of second resistance is connected to second pin of first electric capacity, second pin of first electric capacity is connected to voltage revision unit, and the proportional integral signal is inputed to voltage revision unit.In this technical scheme, constituted the RC integrating circuit by first resistance, second resistance and first electric capacity, can carry out proportional integral to the sampled voltage that current sample module 208 obtains handles, thereby the drive signal of output unit output is carried out adjustment in phase place and the gain by voltage revision unit, change to tackle real-time signal, make the dim signal and the mainboard aligned phase signal of final input led array, led array is accurately driven and light modulation.
In technique scheme, first protection module 212 comprises the 8th resistance, and first pin of the 8th resistance is connected to first power supply by light-adjusting module 208, and the second pin ground connection of the 8th resistance.First power supply here is the general supply of powering for entire circuit; after the 8th resistance carries out voltage sample to this first power supply; second comparing unit in the input driver module 204; and at the sampling supply voltage that collects during greater than second threshold value; driver module 204 quits work, thereby led array is protected, and second threshold value here is a preset threshold value; when surpassing 0.1V, driver module 204 is quit work.
In technique scheme, first protection module 212 also comprises: the 9th resistance and second filter circuit, and wherein, first pin of the 9th resistance is connected to second comparing unit in the driver module 204, and second pin of the 9th resistance is connected to first pin of the 8th resistance, plays interconnect function; Second filter circuit carries out filtering to the sampling supply voltage, can use here but be not limited to electric capacity and finish filter action, and any components and parts that can finish filter action, parts, device etc. all can be applied to this.
In technique scheme, second protection module 214 comprises: the 3rd comparing unit and second switch unit, wherein, the 3rd comparing unit comprises: second triode, the base stage pin of second triode is connected to led array, obtain LED voltage, the emitter pin of second triode is connected to the reference voltage unit of driver module 204, and the collector electrode pin of second triode is connected to the second switch unit, at LED voltage during greater than the 3rd threshold value, the second triode conducting, and send first Continuity signal, the 3rd threshold value to the second switch unit be the reference voltage of reference voltage and second triode conducting voltage and; The second switch unit comprises: the 3rd triode and the 4th triode, wherein the base stage pin of the 3rd triode is connected to the collector electrode pin of second triode, reception is from first Continuity signal of the 3rd comparing unit, the emitter pin of the 3rd triode is connected to second source, and the collector electrode pin ground connection of the 3rd triode; The base stage pin of the 4th triode is connected to the collector electrode pin of the 3rd triode; when the 3rd triode receives first Continuity signal; the 3rd triode conducting; and send second Continuity signal to the base stage pin of the 4th triode; the emitter pin ground connection of the 4th triode; and the collector electrode pin of the 4th triode is connected to first comparing unit; after the 4th triode receives second Continuity signal; the 4th triode conducting; and the receiving element in driver module 204 sends guard signal; receiving element is sent to first comparing unit with guard signal; and first comparing unit guard signal and first threshold are compared; during greater than first threshold, first comparing unit sends stop signal to output unit at guard signal, and then output unit stops to export dim signal.In this technical scheme; at LED voltage during greater than the 3rd threshold value; the second triode conducting; make the 3rd triode conducting, and then make the 4th triode conducting, then send guard signal to first comparing unit by the 4th triode; actual is with the first comparing unit ground connection by the 4th triode; then first comparing unit with this guard signal and first threshold relatively after, less than first threshold the time, will stop driver module 204.
In technique scheme, by negative pressure module 216, can realize driving with a drive circuit 200 to a plurality of led array, and can't realize in that prior art is next, this is because when a plurality of led array that are connected in series are applied voltage, owing to there are a plurality of led array, just need apply higher voltage, promptly the end for array strings applies positive voltage, other end ground connection, but for the led array of an end that applies positive voltage, its withstand voltage properties possibly can't meet the demands, and replaces the production cost that high withstand voltage led array then increases.And for the negative pressure module 216 here, can apply the positive voltage of a part by a end in array strings, and apply the negative voltage of remainder at an end of script ground connection, thereby on total voltage difference, satisfy the demands, and needn't consider the withstand voltage properties of led array, realize utilizing the driving of 200 pairs of a plurality of led array of a drive circuit.Certainly, the negative pressure module 216 here is not limited in drive circuit 200 of the present invention, for special LED chip for driving or other chips, circuit, device etc., all can reach similar multichannel and drive effect.
For the multi-channel driver circuit that has used after the negative pressure module 216, shown in Fig. 2 B, in Fig. 2 B, used a drive circuit 200 to realize driving to led array 2000 and led array 2001, wherein, led array 2000 and led array 2001 are for being connected in series.If do not adopt negative pressure module 216, then node 2002 in the drawings applies positive voltage, and with node 2004 ground connection, but need higher voltage owing to drive a plurality of led array, therefore, need be with the boost in voltage at node 2002 places, but this damages causing led array 2000 to be subjected to too high voltage, perhaps led array 2000 can be changed to high voltage bearing led array, but this will increase cost.And after having adopted negative pressure module 216, can apply a part of positive voltage at node 2002, and apply another part negative voltage at node 2004, then under the situation that total voltage difference satisfies condition, can not cause too high voltage, thereby realize driving for the multichannel of led array to led array 2000.
Concrete formation for the driver module among Fig. 2 A 204 is elaborated below in conjunction with Fig. 3, and Fig. 3 shows the block diagram of driver module according to an embodiment of the invention.
As shown in Figure 3; for driver module 204; comprise reference voltage unit 302; be used to first triode in the switch module that reference voltage is provided; when the base stage pin input high level mainboard signal of first triode and conducting; collector voltage is provided; simultaneously, when the base stage pin input low level mainboard signal of first triode also ended, this reference voltage was not enough so that first diode current flow; guarantee the correct transmission of switching signal; in addition, reference voltage unit 302 is connected in second protection module, for the emitting stage pin of second triode provides voltage; at this moment; conducting voltage (being generally 0.6-0.7V) by the reference voltage and second triode constitutes the 3rd threshold value jointly, thereby LED voltage is compared, and has only when LED voltage surpasses the 3rd threshold value; conducting second triode, and cause the corresponding protection measure.
Receiving element 304 is used to receive from the switching signal of switch module or from the guard signal of second protection module, and this switching signal or guard signal are sent to first comparing unit 306.
First comparing unit 306 to comparing from the switching signal of receiving element 304 or guard signal and presetting first threshold, less than first threshold the time, makes driver module 204 quit work.
Second comparing unit 308; reception is from the sampling supply voltage of in first protection module first power supply being sampled and obtaining; and the supply voltage of will sampling compares with second threshold value of presetting; at the sampling supply voltage during greater than second threshold value; make driver module 204 quit work; here be in order to prevent that the first too high supply voltage from causing the infringement to circuit and device, carries out the corresponding protection measure.
Output unit 310 sends drive signal to light-adjusting module, and accepts the influence for drive signal of voltage-regulation unit 312 and voltage revision unit 314; Reception is from the stop signal that the transmission signal and second comparing unit 308 of first comparing unit 306 sends, and correspondingly makes sending or stopping to send drive signal.
Voltage-regulation unit 312, the sampled voltage that utilizes the current sample module to obtain, drive signal to output unit 310 outputs is controlled, drive signal is regulated accordingly, and dim signal also correspondingly changes under the variation of drive signal, thereby keeps the current constant of led array.
Voltage revision unit 314, the proportional integral signal that utilizes the integral processing module to obtain, phase place, gain to the drive signal of output unit 310 output are controlled, and drive signal is revised accordingly, thereby dim signal and mainboard signal are kept consistency.
Certainly, those skilled in the art should be appreciated that, for above-mentioned each unit, can be realized by independently components and parts or parts, also can be integrated into relevant chip, device waits and realizes.For example Fig. 4 shows the circuit diagram of drive circuit according to an embodiment of the invention.
As shown in Figure 4, in this drive circuit 400, use common PWM chip 402 and peripheral circuit to realize driving and constant-current dimming, thereby can reduce the generation cost when using special-purpose LED chip for driving led array 404.
Realize driving and light modulation to led array below in conjunction with Fig. 5 A and Fig. 5 B to using common chip, wherein, Fig. 5 A shows the circuit diagram of drive circuit according to an embodiment of the invention; Fig. 5 B shows the circuit diagram of drive circuit according to an embodiment of the invention.
Shown in Fig. 5 A, in this drive circuit 500, use PFC chip 502 and peripheral circuit have been realized driving and the light modulation to led array 504, wherein, PFC chip 502 comprises COMP pin 506, FB pin 507, VCC pin 508, VREF pin 509, D RI pin 510, CS pin 511, GND pin 512, VCC pin 508 is used for to 502 power supplies of PFC chip, GND pin 512 is used for PFC chip 502 ground connection, VREF pin 509 can provide stable reference voltage, DRI pin 510 is used for output drive signal, COMP pin 506,511 of FB pin 507 and CS pins are used to realize other functions, and be specific as follows:
When realizing to the driving of led array 504 and light modulation, COMP pin 506 is connected to switch module 514, switch module 514 is used for receiving mainboard signal 516 from mainboard, when mainboard signal 516 is high level, the first triode conducting in the switch module 514, and the mainboard signal 516 after the output amplification, under the effect of this signal, the reverse conducting of first diode, to COMP pin 506 output switching signals, then PFC chip 502 compares this switching signal and presetting first threshold, in switching signal during greater than first threshold, DRI pin 510 output drive signals under the effect of this drive signal, are exported dim signals to led array 504 by light-adjusting module 518 to light-adjusting module 518; When mainboard signal 516 is low level, first triode in the switch module 514 ends, the reference voltage of the VREF pin 509 that the collector electrode pin of first triode connects is not enough to make the reverse conducting of first diode, at this moment, switch module 514 correspondingly produces switching signal and exports COMP pin 506 to, PFC chip 502 compares this switching signal and presetting first threshold, when switching signal is not more than first threshold, DRI pin 510 stops output drive signal to light-adjusting module 518, by light-adjusting module 518 under the effect of this drive signal, stop to led array 504 output dim signals, pass through said process, under the high-low level of mainboard signal 516 changed, dim signal also correspondingly changed, thereby realized driving and light modulation to led array.
When stating the light modulation process in realization, also should realize some other effect.Voltage by 520 pairs of led array 504 of current sample module is sampled, and the sampled voltage that sampling obtains is transferred to the FB pin 507 of PFC chip 502, the current sample module 520 here can but be not limited to use resistance sampling, any can realize this can components and parts, parts or device etc. all can use herein.The sampled voltage of PFC chip 502 by obtaining can be realized the drive signal of output is regulated, thereby guarantee that led array is in the light modulation under the constant current.
Above-mentioned sampled voltage is also handled through integral processing module 522,522 pairs of sampled voltages of the integral processing module here carry out proportional integral to be handled, obtain the proportional integral signal, input to the COMP pin of PFC chip 502 then, by this proportional integral signal the drive signal of output is carried out the revision of phase place, gain etc. by PFC chip 502, thereby guarantee the consistency of drive signal and mainboard signal, and and then guarantee the consistency of dim signal and mainboard signal, realization is to the accurate light modulation of led array 504.Integral processing module 522 can use the RC integrating circuit to realize, every certainly circuit, parts or the device etc. that can realize that the proportional integral is here handled all should be applied to this.
This drive circuit 500 also should be realized defencive function; specifically be divided into two parts; 524 pairs first power supplys of first protection module 526 carry out voltage sample; and the sampling supply voltage that will obtain transfers to the CS pin 511 of PFC chip 502; PFC chip 502 supply voltage of will sampling compares with default second threshold value; and the time greater than second threshold value; make DRI pin 510 stop output drive signal; first power supply 526 here is the general supply that whole drive circuit 500 is powered; this supply voltage is sampled and detected; thereby prevent that too high voltage from damaging led array 504; simultaneously; first protection module 524 can but be not limited only to use resistance to sample, be construed as the every components and parts that can realize this sampling function; parts or device all should be applied to this.
For the second portion of realizing defencive function; as shown in Fig. 5 B; by the led array driving voltage 530 of second triode, 528 receptions from led array 504; and this led array driving voltage 530 and the 3rd threshold value compared; the 3rd threshold value here by the conducting voltage of the reference voltage of the VREF pin 509 of the emitting stage pin that is connected to second triode 528 and second triode 528 and constitute; at led array driving voltage 530 during greater than the 3rd threshold value; 528 conductings of second triode, and to second switch unit 532 outputs first Continuity signal.The second switch unit is under the effect of this first Continuity signal; COMP pin 506 in PFC chip 502 sends guard signal; by PFC chip 502 this guard signal and first threshold are compared; and when guard signal is not more than first threshold; make DRI pin 510 stop output drive signal, thereby stop driving and light modulation LED.The second switch unit 532 here can be made of the 3rd triode 534 and the 4th triode 536; wherein; the 3rd triode 534 receives first Continuity signal and conducting; and correspondingly export second Continuity signal to the 4th triode; the 4th triode sends the corresponding protection signal to COMP pin 506 under the effect of second Continuity signal.Certainly, be not limited to use triode to realize the function of second switch unit 532 here, be construed as, everyly can be used to realize that components and parts, parts or the device of this function all can be used for herein.
Realized driving and light modulation by above-mentioned each parts and circuit to led array 504; and the constant current that has guaranteed led array 504 is adjusted with real-time; has the certain protection function simultaneously; thereby can substitute price higher professional LED chip for driving relatively with cheap parts, realize the reduction of production cost.
Simultaneously, above-mentioned PFC chip 502 can be the PWM chip, or other can be used for chip or circuit, the device etc. of light modulation effect herein.
Fig. 6 shows the block diagram of drive unit according to an embodiment of the invention.
As shown in Figure 6, drive unit 600 comprises drive circuit 602 and other circuit and the parts 604 described in above-mentioned technical scheme according to an embodiment of the invention, by the drive circuit 602 that uses above-mentioned led array, and be integrated in this drive unit 600, thereby can be when removing the special LED chip for driving from, still can realize effectively driving, reduce production costs led array.
Fig. 7 shows the block diagram of display unit according to an embodiment of the invention.
As shown in Figure 7, display unit 700 comprises drive circuit 702 and other circuit and the parts 704 described in above-mentioned technical scheme according to an embodiment of the invention, by the drive circuit 702 that uses above-mentioned led array, can be when producing this display unit 700, remove the special LED chip for driving from, but still can realize effectively driving to led array, reduce production costs.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the drive circuit of a led array is characterized in that, comprising:
Switch module is connected to mainboard, is used to generate switching signal from the mainboard signal of described mainboard, and exports described switching signal to driver module;
Described driver module is connected to described switch module and light-adjusting module, under the control from the described switching signal of described switch module, sends drive signal to described light-adjusting module;
Described light-adjusting module is connected to described led array, receives the described drive signal from described driver module, produces dim signal, and described dim signal is sent to described led array,
Wherein said driver module comprises PFC chip for driving, LC chip for driving and/or instead swashs control chip.
2. the drive circuit of led array according to claim 1 is characterized in that, described switch module comprises:
First switch element and threshold cell, described first switch element is connected to described mainboard, reception is from the described mainboard signal of described mainboard, and according to described mainboard voltage of signals size, to described threshold cell output correspondent voltage, make described threshold cell under the effect of described voltage, export described switching signal to described driver module.
3. the drive circuit of led array according to claim 2 is characterized in that, described first switch element comprises: first triode, and described threshold cell comprises: first diode,
Wherein, the base stage pin of described first triode is connected to described mainboard, reception is from the described mainboard signal of described mainboard, the collector electrode pin of described first triode is connected to the reference voltage unit of described driver module and first pin of described first diode, described reference voltage unit provides reference voltage, and the emitter pin ground connection of described first triode, and second pin of described first diode is connected to described driver module, receiving element to described driver module sends described switching signal, the described switching signal that described receiving element will receive is sent to first comparing unit, described first comparing unit compares described switching signal and presetting first threshold, in described switching signal during greater than described first threshold, the output unit of described first comparing unit in described driver module sends the transmission signal, described output unit sends described drive signal to described light-adjusting module after receiving described transmission signal.
4. according to the drive circuit of each described led array in the claim 1 to 3, it is characterized in that described light-adjusting module comprises:
The NMOS pipe, the grid pin of described NMOS pipe is connected to the described output unit of described driver module, receive described drive signal, the source electrode pin ground connection of described NMOS pipe, and the drain pin of described NMOS pipe is connected to described led array, when the described output unit of described driver module was exported described drive signal, described NMOS managed conducting and sends described dim signal to described led array.
5. according to the drive circuit of each described led array in the claim 1 to 4, it is characterized in that, also comprise:
The current sample module, be connected to described driver module and described led array, driving voltage to described led array is sampled, and the sampled voltage that obtains transferred to described driver module, regulate described drive signal by the voltage-regulation unit in the described driver module according to described sampled voltage, described dim signal correspondingly changes under the adjusting of described drive signal, to keep the current constant of described led array.
6. according to the drive circuit of each described led array in the claim 1 to 5, it is characterized in that, also comprise:
The integral processing module, be connected to described current sample module and described driver module, described sampled voltage from described current sample module is carried out proportional integral to be handled, and the proportional integral signal that obtains transferred to voltage revision unit in the described driver module, the signal attribute of described drive signal is revised according to described proportional integral signal by described voltage revision unit, wherein said signal attribute comprises phase place, gain.
7. according to the drive circuit of each described led array in the claim 1 to 6, it is characterized in that, also comprise:
First protection module; be connected to the described driver module and first power supply; described first power source voltage is sampled; and the sampling supply voltage that will obtain inputs to second comparing unit in the described driver module; described second comparing unit compares described sampling supply voltage and second threshold value of presetting; at described sampling supply voltage during greater than described second threshold value; described second comparing unit sends stop signal to described output unit, and then described output unit stops to export described drive signal.
8. according to the drive circuit of each described led array in the claim 1 to 7, it is characterized in that, also comprise:
Second protection module; be connected to described driver module and described led array; both end voltage to described led array is sampled; the LED voltage and the 3rd threshold value that collect are compared; and at described LED voltage during greater than described the 3rd threshold value; described receiving element in described driver module sends guard signal; described receiving element is sent to described first comparing unit with described guard signal; and described first comparing unit compares described guard signal and described first threshold; at described guard signal during greater than described first threshold; make described first comparing unit send stop signal to described output unit, then described output unit stops to export described drive signal.
9. the drive circuit of led array according to claim 8 is characterized in that, described second protection module comprises: the 3rd comparing unit and second switch unit, wherein,
Described the 3rd comparing unit comprises: second triode, the base stage pin of described second triode is connected to described led array, obtain described LED voltage, the emitter pin of described second triode is connected to the described reference voltage unit of described driver module, and the collector electrode pin of described second triode is connected to described second switch unit, at described LED voltage during greater than described the 3rd threshold value, the described second triode conducting, and send first Continuity signal to described second switch unit, described the 3rd threshold value be the described reference voltage of described reference voltage and described second triode conducting voltage and;
Described second switch unit comprises: the 3rd triode and the 4th triode, the base stage pin of wherein said the 3rd triode is connected to the described collector electrode pin of described second triode, reception is from described first Continuity signal of described the 3rd comparing unit, the emitter pin of described the 3rd triode is connected to second source, and the collector electrode pin ground connection of described the 3rd triode; The base stage pin of described the 4th triode is connected to the described collector electrode pin of described the 3rd triode; when described the 3rd triode receives described first Continuity signal; described the 3rd triode conducting; and send second Continuity signal to the described base stage pin of described the 4th triode; the emitter pin ground connection of described the 4th triode; and the collector electrode pin of described the 4th triode is connected to described first comparing unit; after described the 4th triode receives described second Continuity signal; described the 4th triode conducting; and the described receiving element in described driver module sends described guard signal; described receiving element is sent to described first comparing unit with described guard signal; and described first comparing unit compares described guard signal and described first threshold; at described guard signal during greater than described first threshold; described first comparing unit sends described stop signal to described output unit, and then described output unit stops to export described dim signal.
10. according to the drive circuit of each described led array in the claim 1 to 9, it is characterized in that, also comprise:
The negative pressure module is connected to described led array, when a plurality of described led array series connection forming array string, applies positive voltage at an end of described array strings, and applies negative voltage at the other end of described array strings, comes described array strings is driven.
11. the drive unit of a led array is characterized in that, comprises the drive circuit as the described led array of claim 1 to 10.
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| CN201110287258.0A CN102291901B (en) | 2011-09-23 | 2011-09-23 | Driving circuit and driving device for light emitting diode (LED) array |
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| CN201110287258.0A CN102291901B (en) | 2011-09-23 | 2011-09-23 | Driving circuit and driving device for light emitting diode (LED) array |
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| CN102291901B CN102291901B (en) | 2014-05-07 |
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