CN202334988U - Driving circuit and driving device of light emitting diode (LED) array - Google Patents
Driving circuit and driving device of light emitting diode (LED) array Download PDFInfo
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- CN202334988U CN202334988U CN2011203625247U CN201120362524U CN202334988U CN 202334988 U CN202334988 U CN 202334988U CN 2011203625247 U CN2011203625247 U CN 2011203625247U CN 201120362524 U CN201120362524 U CN 201120362524U CN 202334988 U CN202334988 U CN 202334988U
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Abstract
The utility model provides a driving circuit of an LED array, comprising a switch module, a driving module and a light regulating module, wherein the switch module is connected to a main board, uses a main board signal from the main board to generate a switch signal and soutputs the switch signal to the driving module; the driving module is connected to the switch module and the light regulating module and sends a driving signal to the light regulating module under the control of the switch signal from the switch module; the light regulating module is connected to the LED array, receives the driving signal from the driving module, generates a light regulating signal and sends the light regulating signal to the LED array; and the driving module comprises a power factor correction (PFC) driving chip, an inductance-capacitance (LC) driving chip and/or a flyback control chip. Correspondingly, the utility model also provides a driving device of the LED array. Through the technical scheme of the utility model, special LED driving chips can be replaced by ordinary driving chips and peripheral circuits, so as to realize well effect and reduce the production cost.
Description
Technical field
The utility model 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, specifically like the mode of Fig. 1, uses special-purpose LED chip for driving 102 to realize the constant current design to led array 104; 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 use the LED chip for driving of common chip for driving and peripheral circuit instead of dedicated, thereby when realizing realizing effect preferably, reduce production costs.
The utility model content
In order one of to solve the problems of the technologies described above at least; The utility model provides the Driving technique of a kind of LED; Can use the LED chip for driving of common chip for driving and peripheral circuit instead of dedicated, thereby when realizing realizing effect preferably, reduce production costs.
In view of this, the utility model provides a kind of drive circuit of led array, comprising: switch module, be connected to mainboard, be used to generate switching signal, and export said switching signal to driver module from the mainboard signal of said mainboard; Said driver module is connected to said switch module and light-adjusting module, under the control from the said switching signal of said switch module, sends drive signal to said light-adjusting module; Said light-adjusting module; Be connected to said led array, receive said drive signal, produce dim signal from said driver module; And said dim signal is sent to said 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; Like PFC chip for driving, LC chip for driving or instead swash control chip etc.,, thereby can realize effective driving to led array through this driver module and peripheral circuit such as above-mentioned switch module, light-adjusting module etc.The switch module here is used to from the signal of mainboard driver module controlled, and the mainboard signal here can be for like the mainboard pwm signal.
According to the another aspect of the utility model, a kind of drive unit of led array has also been proposed, comprise the drive circuit of the led array described in above-mentioned technical scheme.In this technical scheme, through 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 according to the drive circuit of the led array of the embodiment of the utility model;
Fig. 2 B shows the block diagram according to the multi-channel driver circuit of the led array of the embodiment of the utility model;
Fig. 3 shows the block diagram according to the driver module of the embodiment of the utility model;
Fig. 4 shows the circuit diagram according to the drive circuit of the embodiment of the utility model;
Fig. 5 A shows the circuit diagram according to the drive circuit of the embodiment of the utility model;
Fig. 5 B shows the circuit diagram according to the drive circuit of the embodiment of the utility model;
Fig. 6 shows the block diagram according to the drive unit of the embodiment of the utility model; And
Fig. 7 shows the block diagram according to the display unit of the embodiment of the utility model.
Embodiment
In order more to be expressly understood above-mentioned purpose, the feature and advantage of the utility model, the utility model is further described in detail below in conjunction with accompanying drawing and embodiment.
A lot of details have been set forth in the following description so that make much of the utility model; But; The utility model can also adopt other to be different from other modes described here and implement, and therefore, the utility model is not limited to the restriction of following disclosed specific embodiment.
Fig. 2 shows the block diagram according to the drive circuit of the led array of the embodiment of the utility model.
Shown in Fig. 2 A, comprise according to the drive circuit 200 of the led array of the embodiment of the utility model: switch module 202, be connected to mainboard, 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 is transferred to driver module 204, regulates 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 the voltage revision unit in the driver module 204, and 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 the second preset 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 is connected to driver module 204 and led array, and the voltage of led array is sampled; LED voltage that collects and the 3rd threshold value are compared; And at LED voltage during greater than the 3rd threshold value, the receiving element in driver module 204 sends guard signal, and 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, make first comparing unit send stop signal to output unit at guard signal, 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 said array strings, comes the array string to drive.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; Like PFC chip for driving, LC chip for driving or instead swash control chip etc.,, thereby can realize effective driving to led array through this driver module and peripheral circuit such as above-mentioned switch module, light-adjusting module etc.The switch module here is used to from the signal of mainboard driver module controlled, and the mainboard signal here can be for like 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 said 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, and threshold cell comprises first diode; Wherein, the base stage pin of first triode is connected to mainboard, receives the mainboard signal from 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, and 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; To the receiving element transmit button signal of driver module 204, receiving element is sent to first comparing unit with the switching signal that receives, and first comparing unit compares switching signal and presetting first threshold; In switching signal during greater than first threshold; The output unit of first comparing unit in driver module 204 sends the transmission signal, after output unit receives and sends signal, sends 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, surpass the breakdown voltage threshold of 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, and first comparing unit compares this switching signal and first threshold; Such as first threshold here 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 was low level, first triode ended, and 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, and then first diode place path ends, and sends the switching signal of " ending " to the receiving element of driver module 204; Then through first comparing unit relatively after; Driver module 204 ends, and light-adjusting module 206 stops to export dim signal, and then led array quits work; Under the high level and low level effect of aforesaid mainboard signal, realize 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, and 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, and the grid pin of NMOS pipe is connected to the output unit of driver module 204, receives 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 here 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 like triode, PMOS pipe, switching circuit etc., all can be used for here.
In technique scheme; Current sample module 208 comprises: the 7th resistance, and 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 through the 7th resistance the driving voltage of led array is sampled; Understand the real-time condition of led array, and when sampled voltage changes, make real-time adjustment, make led array under the certain situation of self resistance through the voltage-regulation unit; Be able to keep 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, receive the sampled voltage from 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 and handle, thereby the drive signal of output unit output carried out the adjustment in phase place and the gain, change to tackle real-time signal through voltage revision unit; 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 through light-adjusting module 208, and the second pin ground connection of the 8th resistance.First power supply here is the general supply of supplying power for entire circuit, after the 8th resistance carries out voltage sample to this first power supply, and 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 accomplish filter action, and any components and parts that can accomplish 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, and the base stage pin of second triode is connected to led array, obtains 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, and the second triode conducting; And send first Continuity signal to the second switch unit, the 3rd threshold value be reference voltage reference voltage and second triode conducting voltage with; 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, and 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 transmission of the receiving element in driver module 204 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, through negative pressure module 216, the driving that can use a drive circuit 200 to realize to a plurality of led array; And can't realize that this is because when a plurality of led array that are connected in series are applied voltage, owing to there being a plurality of led array in that prior art is next; 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, the production cost that the high withstand voltage led array of replacement then increases.And for the negative pressure module 216 here; Can apply the positive voltage of a part through 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, realized 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 the drive circuit 200 of the utility model, 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 in the drawings node 2002 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 receive too high voltage; Perhaps can led array 2000 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.
For the concrete formation of the driver module among Fig. 2 A 204, will combine Fig. 3 to be elaborated below, Fig. 3 shows the block diagram according to the driver module of the embodiment of the utility model.
As shown in Figure 3, for driver module 204, comprise reference voltage unit 302, first triode that is used in the switch module provides reference voltage; 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 guarantees the correct transmission of switching signal; In addition, reference voltage unit 302 is connected in second protection module, is that the emitting stage pin of second triode provides voltage; At this moment, constitute the 3rd threshold value jointly by the conducting voltage (being generally 0.6-0.7V) of the reference voltage and second triode, thereby LED voltage is compared; Have 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 the second preset threshold value, during greater than second threshold value, makes driver module 204 quit work at the sampling supply voltage; 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 voltage-regulation unit 312 and the influence of voltage revision unit 314 for drive signal; 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 keep 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, the technical staff in present technique field 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 according to the drive circuit of the embodiment of the utility model.
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 according to the drive circuit of the embodiment of the utility model; Fig. 5 B shows the circuit diagram according to the drive circuit of the embodiment of the utility model.
Shown in Fig. 5 A, in this drive circuit 500, use PFC chip 502 and peripheral circuit to realize driving and light modulation to led array 504; Wherein, PFC chip 502 comprises COMP pin 506, FB pin 507, VCC pin 508, VREF pin 509, DRI pin 510, CS pin 511, GND pin 512, and VCC pin 508 is used for to 502 power supplies of PFC chip, and 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, and COMP pin 506, FB pin 507 and 511 of CS pins are used to realize other functions, and be specific as follows:
When realizing that driving to led array 504 is with light modulation, COMP pin 506 is connected to switch module 514, and switch module 514 is used for from mainboard reception mainboard signal 516; 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 was low level, first triode in the switch module 514 ended, and 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, and 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,, under the effect of this drive signal, is stopped to led array 504 output dim signals by light-adjusting module 518; 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 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 through 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, through this proportional integral signal the drive signal of output is carried out the revision of phase place, gain etc., thereby guarantee the consistency of drive signal and mainboard signal by PFC chip 502; 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 is divided into two parts, and 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 the second preset threshold value, and greater than second threshold value time, makes DRI pin 510 stop output drive signal; First power supply 526 here is the general supply that whole drive circuit 500 is supplied power; 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 and all should be applied to this.
For the second portion of realizing defencive function; 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 D RI pin 510 stop output drive signal, thereby stop driving and light modulation to LED.The second switch unit 532 here can be made up 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 signals 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 here.
Driving and light modulation have been realized through 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 the light modulation effect here.
Fig. 6 shows the block diagram according to the drive unit of the embodiment of the utility model.
As shown in Figure 6; Drive unit 600 according to the embodiment of the utility model comprises drive circuit 602 and other circuit and parts 604 described in above-mentioned technical scheme; Through the drive circuit 602 that uses above-mentioned led array, and be integrated in this drive unit 600, thus 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 according to the display unit of the embodiment of the utility model.
As shown in Figure 7; Display unit 700 according to the embodiment of the utility model comprises drive circuit 702 and other circuit and parts 704 described in above-mentioned technical scheme; Through the drive circuit 702 that uses above-mentioned led array, can 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 preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (10)
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 said mainboard, and exports said switching signal to driver module;
Said driver module is connected to said switch module and light-adjusting module, under the control from the said switching signal of said switch module, sends drive signal to said light-adjusting module;
Said light-adjusting module is connected to said led array, receives the said drive signal from said driver module, produces dim signal, and said dim signal is sent to said 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, said switch module comprises:
First switch element and threshold cell; Said first switch element is connected to said mainboard, receives the said mainboard signal from said mainboard, and according to said mainboard voltage of signals size; To said threshold cell output correspondent voltage; Make said threshold cell under the effect of said voltage, export said switching signal to said driver module
Wherein, said first switch element comprises: first triode, and said threshold cell comprises: first diode,
The base stage pin of said first triode is connected to said mainboard; Reception is from the said mainboard signal of said mainboard; The collector electrode pin of said first triode is connected to the reference voltage unit of said driver module and first pin of said first diode, and said reference voltage unit provides reference voltage, and the emitter pin ground connection of said first triode; And second pin of said first diode is connected to said driver module; Receiving element to said driver module sends said switching signal, and the said switching signal that said receiving element will receive is sent to first comparing unit, and said first comparing unit compares said switching signal and presetting first threshold; In said switching signal during greater than said first threshold; The output unit of said first comparing unit in said driver module sends the transmission signal, and said output unit sends said drive signal to said light-adjusting module after receiving said transmission signal.
3. the drive circuit of led array according to claim 1 is characterized in that, said light-adjusting module comprises:
The NMOS pipe; The grid pin of said NMOS pipe is connected to the said output unit of said driver module; Receive said drive signal, the source electrode pin ground connection of said NMOS pipe, and the drain pin of said NMOS pipe is connected to said led array; Said output unit at said driver module is exported said drive signal, and said NMOS manages conducting and sends said dim signal to said led array.
4. the drive circuit of led array according to claim 1 is characterized in that, also comprises:
The current sample module; Be connected to said driver module and said led array; Driving voltage to said led array is sampled, and the sampled voltage that obtains is transferred to said driver module, regulates said drive signal by the voltage-regulation unit in the said driver module according to said sampled voltage; Said dim signal correspondingly changes under the adjusting of said drive signal, to keep the current constant of said led array.
5. the drive circuit of led array according to claim 1 is characterized in that, also comprises:
The Integral Processing module; Be connected to said current sample module and said driver module; Said sampled voltage from said current sample module is carried out proportional integral to be handled; And the proportional integral signal that obtains transferred to the voltage revision unit in the said driver module, and the signal attribute of said drive signal to be revised according to said proportional integral signal by said voltage revision unit, wherein said signal attribute comprises phase place, gain.
6. according to the drive circuit of each described led array in the claim 1 to 5, it is characterized in that, also comprise:
First protection module; Be connected to the said driver module and first power supply; Said first power source voltage is sampled; And the sampling supply voltage that will obtain inputs to second comparing unit in the said driver module, and said second comparing unit compares said sampling supply voltage and the second preset threshold value, at said sampling supply voltage during greater than said second threshold value; Said second comparing unit sends stop signal to said output unit, and then said output unit stops to export said drive signal.
7. according to the drive circuit of each described led array in the claim 1 to 5, it is characterized in that, also comprise:
Second protection module; Be connected to said driver module and said led array; Voltage to said led array is sampled, LED voltage that collects and the 3rd threshold value compared, and at said LED voltage during greater than said the 3rd threshold value; Said receiving element in said driver module sends guard signal; Said receiving element is sent to said first comparing unit with said guard signal, and said first comparing unit compares said guard signal and said first threshold, at said guard signal during greater than said first threshold; Make said first comparing unit send stop signal to said output unit, then said output unit stops to export said drive signal.
8. the drive circuit of led array according to claim 7 is characterized in that, said second protection module comprises: the 3rd comparing unit and second switch unit, wherein,
Said the 3rd comparing unit comprises: second triode; The base stage pin of said second triode is connected to said led array; Obtain said LED voltage, the emitter pin of said second triode is connected to the said reference voltage unit of said driver module, and the collector electrode pin of said second triode is connected to said second switch unit; At said LED voltage during greater than said the 3rd threshold value; The said second triode conducting, and send first Continuity signal, said the 3rd threshold value to said second switch unit be said reference voltage said reference voltage and said second triode conducting voltage with;
Said 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 said collector electrode pin of said second triode; Reception is from said first Continuity signal of said the 3rd comparing unit; The emitter pin of said the 3rd triode is connected to second source, and the collector electrode pin ground connection of said the 3rd triode; The base stage pin of said the 4th triode is connected to the said collector electrode pin of said the 3rd triode; When said the 3rd triode receives said first Continuity signal, said the 3rd triode conducting, and send second Continuity signal to the said base stage pin of said the 4th triode; The emitter pin ground connection of said the 4th triode; And the collector electrode pin of said the 4th triode is connected to said first comparing unit, after said the 4th triode receives said second Continuity signal, and said the 4th triode conducting; And the said receiving element in said driver module sends said guard signal; Said receiving element is sent to said first comparing unit with said guard signal, and said first comparing unit compares said guard signal and said first threshold, at said guard signal during greater than said first threshold; Said first comparing unit sends said stop signal to said output unit, and then said output unit stops to export said dim signal.
9. according to the drive circuit of each described led array in the claim 1 to 5, it is characterized in that, also comprise:
The negative pressure module is connected to said led array, when a plurality of said led array series connection forming array string, applies positive voltage at an end of said array strings, and applies negative voltage at the other end of said array strings, comes said array strings is driven.
10. the drive unit of a led array is characterized in that, comprises the drive circuit like the described led array of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203625247U CN202334988U (en) | 2011-09-23 | 2011-09-23 | Driving circuit and driving device of light emitting diode (LED) array |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203625247U CN202334988U (en) | 2011-09-23 | 2011-09-23 | Driving circuit and driving device of light emitting diode (LED) array |
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| Publication Number | Publication Date |
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| CN202334988U true CN202334988U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203625247U Expired - Lifetime CN202334988U (en) | 2011-09-23 | 2011-09-23 | Driving circuit and driving device of light emitting diode (LED) array |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291901A (en) * | 2011-09-23 | 2011-12-21 | 青岛海信电器股份有限公司 | Driving circuit and driving device for light emitting diode (LED) array |
-
2011
- 2011-09-23 CN CN2011203625247U patent/CN202334988U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291901A (en) * | 2011-09-23 | 2011-12-21 | 青岛海信电器股份有限公司 | Driving circuit and driving device for light emitting diode (LED) array |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
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Granted publication date: 20120711 |