CN102291901B - 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
- Publication number
- CN102291901B CN102291901B CN201110287258.0A CN201110287258A CN102291901B CN 102291901 B CN102291901 B CN 102291901B CN 201110287258 A CN201110287258 A CN 201110287258A CN 102291901 B CN102291901 B CN 102291901B
- Authority
- CN
- China
- Prior art keywords
- signal
- module
- triode
- voltage
- led array
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
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 LED Driving technique, in particular to drive circuit and the drive unit of LED array.
Background technology
Current LED Driving technique is to boost to realize through BOOST mostly, concrete as the mode of Fig. 1, use special LED to drive chip 102 to realize the constant current design to LED array 104, two secondary LED drive chip etc., and component number is many, poor reliability, and special LED drives chip 102 to belong to different producers, poor compatibility, (the special LED of general single channel drives the price of chip 102 more than 2 yuan) on the high side, is unfavorable for large-scale promotion and application.
Therefore, need a kind of new LED Driving technique, can drive chip with the LED of common driving chip and peripheral circuit instead of dedicated, thereby 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 drive chip with the LED of common driving chip and peripheral circuit instead of dedicated, thereby when realizing and 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, utilize from the mainboard signal of described mainboard and generate switching signal, and export described switching signal to driver module; Described driver module, is connected to described switch module and light-adjusting module, under the control of the described switching signal from described switch module, to described light-adjusting module, sends and drives signal; Described light-adjusting module, be connected to described LED array, receive the described driving signal from described driver module, produce dim signal, and described dim signal is sent to described LED array, wherein said driver module comprises that PFC drives chip, LC to drive chip and/or flyback 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 LED driving chip, as driving chip, LC, PFC drives chip or flyback control chip etc., by this driver module and peripheral circuit as above-mentioned switch module, light-adjusting module etc., thereby can realize the effective driving to LED array.The switch module utilization is here controlled driver module from the signal of mainboard, and the mainboard signal here can be as 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 technique 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 special LED driving chip from, still can LED array be realized effectively and being driven, reduce production costs.
Accompanying drawing explanation
Fig. 1 shows the circuit diagram of drive circuit in 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 clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.
Set forth in the following description a lot of details 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.
As shown in Figure 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 utilize from the mainboard signal of mainboard and generate switching signal, and export switching signal to driver module 204, driver module 204, be connected to switch module 202 and light-adjusting module 206, under the control of the switching signal from switch module 202, to light-adjusting module 206, send and drive signal, wherein said driver module to comprise that PFC drives chip, LC to drive chip and/or flyback control chip, light-adjusting module 206, is connected to LED array, receives the driving 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 obtaining is transferred to driver module 204, by the voltage-regulation unit in driver module 204, according to sampled voltage, regulate driving signal, dim signal correspondingly changes under the adjusting that drives 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 to proportional integral processing, and the proportional integral signal obtaining is transferred to the voltage revision unit in driver module 204, by voltage revision unit, according to proportional integral signal, the signal attribute that drives signal is revised, wherein signal attribute comprises phase place, gain, the first protection module 212, be connected to driver module 204 and the first power supply, voltage to the first power supply is sampled, and the sampling supply voltage obtaining is inputed to the second comparing unit in driver module 204, the second comparing unit compares sampling supply voltage and default Second Threshold, when sampling supply voltage is greater than Second Threshold, the second comparing unit sends stop signal to output unit, and output unit stops output drive signal, the second protection module 214, be connected to driver module 204 and LED array, both end voltage to LED array is sampled, the LED voltage collecting and the 3rd threshold value are compared, and when LED voltage is greater than the 3rd threshold value, receiving element in driver module 204 sends guard signal, receiving element is sent to the first comparing unit by guard signal, and first comparing unit guard signal and first threshold are compared, when guard signal is less than first threshold, make the first comparing unit send stop signal to output unit, output unit stops output drive signal, negative pressure module 216, is connected to LED array, when multiple LED array array strings in series, applies positive voltage, and apply negative voltage at the other end of described array strings in one end of array strings, carrys out pair array string and drives.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 LED driving chip, as driving chip, LC, PFC drives chip or flyback control chip etc., by this driver module and peripheral circuit as above-mentioned switch module, light-adjusting module etc., thereby can realize the effective driving to LED array.The switch module utilization is here controlled driver module from the signal of mainboard, and the mainboard signal here can be as mainboard pwm signal.
In technique scheme, switch module 202 comprises: the first switch element and threshold cell, wherein, the first switch element is connected to mainboard, reception is from the described mainboard signal of mainboard, and according to the voltage swing of mainboard signal, to threshold cell, exports corresponding voltage, threshold cell is under the effect of this voltage, to driver module 204 output switching signals.
In technique scheme, the first switch element comprises the first triode, threshold cell comprises the first diode, wherein, the base stage pin of the first triode is connected to mainboard, reception is from the mainboard signal of mainboard, the collector electrode pin of the first triode is connected to the reference voltage unit of driver module 204 and the first pin of the first diode, reference voltage unit provides reference voltage, and the emitter pin ground connection of the first triode, and the second pin of the first diode is connected to driver module 204, to the receiving element transmit button signal of driver module 204, receiving element is sent to the first comparing unit by the switching signal receiving, the first comparing unit is by switching signal and default first threshold comparison, when switching signal is greater than first threshold, the first comparing unit sends transmitted signal to the output unit in driver module 204, output unit receives after transmitted signal, to light-adjusting module 206, send and drive signal.In this technical scheme, when mainboard signal is high level, the conducting under this mainboard signal function of the first triode, after this mainboard signal is exaggerated, exceed the breakdown voltage threshold of the first diode, the reverse conducting of the first diode, to the receiving element of driver module 204, send the switching signal of " conducting ", receiving element is sent to the first comparing unit by this switching signal, the first comparing unit is by this switching signal and first threshold comparison, such as first threshold is herein 1V, when switching signal is greater than 1V, the first comparing unit sends a signal to output unit by transmission, by output unit output drive signal, light-adjusting module 206 receives this driving signal, and send dim signal to LED array, the driving of realization to LED array, and when mainboard signal is low level, the first triode cut-off, the reference voltage being connected by the collector electrode pin of the first triode exports the first diode to, this voltage is less than the first diode, the first diode place path cut-off, to the receiving element of driver module 204, send the switching signal of " cut-off ", through the first comparing unit relatively after, driver module 204 ends, light-adjusting module 206 stops exporting dim signal, LED array quits work, and under the high level and low level effect of mainboard signal as above, 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 the first filter circuit, wherein, the first pin of the 3rd resistance is connected to mainboard, and the second pin of the 3rd resistance is connected to the base stage pin of the first triode, the 3rd resistance is sent to the first triode by the mainboard signal from mainboard, and this mainboard signal is carried out to current limliting, prevents that the first triode is damaged; The first pin of the 4th resistance is connected to the 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 mainboard signal; The 5th resistance is connected between reference voltage unit and the collector electrode pin of the first triode, for current limliting; The first filter circuit is for carrying out filtering to the collector electrode pin of the first triode, and first filter circuit here can be realized by electric capacity.
In technique scheme, light-adjusting module 206 comprises: NMOS pipe, the grid pin of NMOS pipe is connected to the output unit of driver module 204, receive and drive signal, the source electrode pin ground connection of NMOS pipe, and the drain pin of NMOS pipe is connected to LED array, when the output unit output drive signal of driver module 204, the conducting of NMOS pipe also 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, for current limliting.In addition, for NMOS pipe herein, it should be appreciated by those skilled in the art, 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 for herein.
In technique scheme, current sample module 208 comprises: the 7th resistance, the first pin of the 7th resistance is connected to the voltage-regulation unit in LED array and 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 voltage-regulation unit, make LED array in the situation that self resistance is certain, kept constant current, otherwise there will be colour cast, brightness not even LED array be damaged.
In technique scheme, integral processing module 210 comprises: the first resistance, the second resistance and the first electric capacity, wherein, the first pin of the first resistance is connected to current sample module 208, reception is from the sampled voltage of current sample module 208, and the second pin of the first resistance is connected to the first pin of the first electric capacity; The first pin of the second resistance is connected to the first pin of the first resistance, and the second pin of the second resistance is connected to the second pin of the first electric capacity, the second pin of the first electric capacity is connected to voltage revision unit, and proportional integral signal is inputed to voltage revision unit.In this technical scheme, by the first resistance, the second resistance and the first electric capacity, formed RC integrating circuit, the sampled voltage that can obtain current sample module 208 carries out proportional integral processing, thereby by voltage, revise unit the driving signal of output unit output is carried out to the adjustment in phase place and gain, to tackle real-time signal intensity, the dim signal and the mainboard aligned phase signal that make finally to input LED array, accurately drive and light modulation LED array.
In technique scheme, the first protection module 212 comprises the 8th resistance, and the first pin of the 8th resistance is connected to the first power supply by light-adjusting module 208, and the second pin ground connection of the 8th resistance.First power supply is here the general supply of powering for whole circuit; the 8th resistance carries out after voltage sample this first power supply; the second comparing unit in input driver module 204; and when the sampling supply voltage collecting is greater than Second Threshold; driver module 204 quits work, thereby LED array is protected, and the Second Threshold is here default threshold value; as while exceeding 0.1V, driver module 204 is quit work.
In technique scheme, the first protection module 212 also comprises: the 9th resistance and the second filter circuit, and wherein, the first pin of the 9th resistance is connected to the second comparing unit in driver module 204, and the second pin of the 9th resistance is connected to the first pin of the 8th resistance, plays connection function; The second filter circuit carries out filtering to sampling supply voltage, here can with but be not limited to electric capacity and complete filter action, any components and parts that can complete filter action, parts, device etc. all can be applied to this.
In technique scheme, the second protection module 214 comprises: the 3rd comparing unit and second switch unit, wherein, the 3rd comparing unit comprises: the second triode, the base stage pin of the second triode is connected to LED array, obtain LED voltage, the emitter pin of the second triode is connected to the reference voltage unit of driver module 204, and the collector electrode pin of the second triode is connected to second switch unit, when LED voltage is greater than the 3rd threshold value, the second triode conducting, and send the first Continuity signal to second switch unit, the reference voltage that the 3rd threshold value is reference voltage and the conducting voltage of the second triode and, 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 the second triode, reception is from the 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 the first Continuity signal, the 3rd triode conducting, and send the 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 the first comparing unit, at the 4th triode, receive after the second Continuity signal, the 4th triode conducting, and the receiving element in driver module 204 sends guard signal, receiving element is sent to the first comparing unit by guard signal, and first comparing unit guard signal and first threshold are compared, when guard signal is less than first threshold, the first comparing unit sends stop signal to output unit, output unit stops exporting dim signal.In this technical scheme; when LED voltage is greater than the 3rd threshold value; the second triode conducting; make the 3rd triode conducting, and then make the 4th triode conducting, by the 4th triode, to the first comparing unit, send guard signal; actual is by the first comparing unit ground connection by the 4th triode; the first comparing unit by this guard signal and first threshold relatively after, when being less than first threshold, will stop driver module 204.
In technique scheme, by negative pressure module 216, can realize the driving to multiple LED array with a drive circuit 200, and cannot realize prior art is next, this is due to when the multiple LED array that are connected in series are applied to voltage, owing to there being multiple LED array, just need to apply higher voltage, for one end of array strings, apply positive voltage, other end ground connection, but for the LED array of one end that applies positive voltage, its withstand voltage properties possibly cannot meet the demands, replace the production cost that high withstand voltage LED array increases.And for the negative pressure module 216 here, can be by applying a part of positive voltage in one end of array strings, and in one end of script ground connection, apply the negative voltage of remainder, thereby satisfy the demands in total voltage difference, and needn't consider the withstand voltage properties of LED array, realize and utilized the driving of a drive circuit 200 to multiple LED array.Certainly, the negative pressure module 216 is here not limited in drive circuit 200 of the present invention, for special LED, drives chip or other chips, circuit, device etc., all can reach similar multichannel and drive effect.
For the multi-channel driver circuit having used after negative pressure module 216, as shown in Figure 2 B, in Fig. 2 B, used a drive circuit 200 to realize the 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, node 2002 in the drawings applies positive voltage, and by node 2004 ground connection, but owing to driving multiple LED array to need higher voltage, therefore, need to be by the boost in voltage at node 2002 places, but this damages causing LED array 2000 to be subject to too high voltage, or LED array 2000 can be changed to high voltage bearing LED array, but this will increase cost.And adopted after negative pressure module 216, can apply a part of positive voltage at node 2002, and apply another part negative voltage at node 2004, in the case of total voltage difference satisfies condition, can not cause too high voltage to LED array 2000, thereby realized for the multichannel of LED array, drive.
For the concrete formation of the driver module 204 in Fig. 2 A, below in conjunction with Fig. 3, be elaborated, 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 the first triode in switch module that reference voltage is provided, when the base stage pin input high level mainboard signal of the first triode conducting, collector voltage is provided, simultaneously, at the base stage pin input low level mainboard signal of the first triode and while ending, this reference voltage is not enough so that the first diode current flow, guarantee the correct transmission of switching signal, in addition, reference voltage unit 302 is connected in the second protection module, for the emitting stage pin of the second triode provides voltage, now, conducting voltage (being generally 0.6-0.7V) by reference voltage and the second triode forms the 3rd threshold value jointly, thereby LED voltage is compared, only have when LED voltage exceedes the 3rd threshold value, conducting the second triode, and cause corresponding safeguard measure.
Receiving element 304, for receiving from the switching signal of switch module or from the guard signal of the second protection module, and is sent to the first comparing unit 306 by this switching signal or guard signal.
The first comparing unit 306, compares the switching signal from receiving element 304 or guard signal and default first threshold, when being less than first threshold, makes driver module 204 quit work.
The second comparing unit 308; reception from the first protection module to the first power supply sampling supply voltage obtaining of sampling; and this sampling supply voltage and default Second Threshold are compared; when sampling supply voltage is greater than Second Threshold; 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 corresponding safeguard measure.
Output unit 310, sends and drives signal to light-adjusting module, and accepts voltage-regulation unit 312 and voltage revision unit 314 for the impact that drives signal; The stop signal that reception is sent from transmitted signal and second comparing unit 308 of the first comparing unit 306, correspondingly makes transmission or stops sending driving signal.
Voltage-regulation unit 312, the sampled voltage that utilizes current sample module to obtain, the driving signal that output unit 310 is exported is controlled, make to drive signal to regulate accordingly, and dim signal also correspondingly changes under the variation that drives signal, thus the current constant of maintenance LED array.
Voltage revision unit 314, the proportional integral signal that utilizes integral processing module to obtain, phase place, the gain of the driving signal that output unit 310 is exported are controlled, and make to drive signal to be revised accordingly, thereby dim signal and mainboard signal are kept consistency.
Certainly, those skilled in the art should be appreciated that, for above-mentioned unit, can be realized by independently components and parts or parts, also can be integrated into corresponding chip, device etc. and realize.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 the constant-current dimming to LED array 404, thereby can reduce the generation cost while using special LED to drive chip.
Below in conjunction with Fig. 5 A and Fig. 5 B, to using common chip to realize driving and the light modulation to LED array, 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.
As shown in Figure 5A, in this drive circuit 500, use PFC chip 502 and peripheral circuit to realize 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, DRI pin 510, CS pin 511, GND pin 512, VCC pin 508 is for powering to PFC chip 502, GND pin 512 is for by PFC chip 502 ground connection, VREF pin 509 can provide stable reference voltage, DRI pin 510 is for output drive signal, COMP pin 506, 511 of FB pin 507 and CS pins are for realizing other functions, specific as follows:
When the driving in realization to LED array 504 and light modulation, COMP pin 506 is connected to switch module 514, switch module 514 is for receiving mainboard signal 516 from mainboard, when mainboard signal 516 is high level, the first triode conducting in switch module 514, and the mainboard signal 516 after output amplification, under the effect of this signal, the reverse conducting of the first diode, to COMP pin 506 output switching signals, PFC chip 502 compares this switching signal and default first threshold, when switching signal is greater than first threshold, DRI pin 510 output drive signals are to light-adjusting module 518, by light-adjusting module 518 under the effect of this driving signal, to LED array 504, export dim signal, when mainboard signal 516 is low level, the first triode cut-off in switch module 514, the reference voltage of the VREF pin 509 that the collector electrode pin of the first triode connects is not enough to make the reverse conducting of the first diode, now, switch module 514 correspondingly produces switching signal and exports COMP pin 506 to, PFC chip 502 compares this switching signal and default 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 driving signal, stop exporting dim signal to LED array 504, pass through said process, under the low and high level of mainboard signal 516 changes, dim signal also correspondingly changes, thereby realize driving and light modulation to LED array.
While stating in realization light modulation process, also should realize some other effect.By current sample module 520, the voltage of LED array 504 is sampled, and the sampled voltage that sampling is obtained transfers 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.PFC chip 502, by the sampled voltage obtaining, can be realized the driving signal of output is regulated, thereby guarantees the light modulation of LED array under constant current.
Above-mentioned sampled voltage is also processed through integral processing module 522, the integral processing module 522 is here carried out proportional integral processing to sampled voltage, obtain proportional integral signal, then input to the COMP pin of PFC chip 502, by PFC chip 502, by this proportional integral signal, the driving signal of output is carried out the revision of phase place, gain etc., thereby guarantee to drive the consistency of signal and mainboard signal, and and then guarantee the consistency of dim signal and mainboard signal, the accurate light modulation of realization to LED array 504.Integral processing module 522 can be used RC integrating circuit to realize, and every circuit, parts or the device etc. that can realize the proportional integral processing here all should be applied to this certainly.
This drive circuit 500 also should be realized defencive function, specifically be divided into two parts, the first protection module 524 carries out voltage sample to the first power supply 526, and the sampling supply voltage obtaining is transferred to the CS pin 511 of PFC chip 502, PFC chip 502 compares this sampling supply voltage and default Second Threshold, and when being greater than Second Threshold, make DRI pin 510 stop output drive signal, first power supply 526 is here 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, the 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 functions, parts or device all should be applied to this.
For the Part II of realizing defencive function; as shown in Figure 5 B; by the second triode 528, receive the LED array driving voltage 530 from LED array 504; and this LED array driving voltage 530 and the 3rd threshold value are compared; the 3rd threshold value here by be connected to the reference voltage of VREF pin 509 of emitting stage pin of the second triode 528 and the conducting voltage of the second triode 528 and form; when LED array driving voltage 530 is greater than the 3rd threshold value; the second triode 528 conductings, and export the first Continuity signal to second switch unit 532.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 to LED.The second switch unit 532 here can consist of the 3rd triode 534 and the 4th triode 536; wherein; the 3rd triode 534 receives the first Continuity signal and conducting; and correspondingly export the second Continuity signal to the 4th triode; the 4th triode, under the effect of the second Continuity signal, sends corresponding guard signal to COMP pin 506.Certainly, be not limited to use triode to realize the function of second switch unit 532 here, be construed as, every can all can be for herein for components and parts, parts or the device of realizing this function.
By above-mentioned each parts and circuit, realized driving and the light modulation to LED array 504; and guaranteed the constant current of LED array 504 and adjusted in real time; there is certain defencive function simultaneously; thereby can substitute the professional LED that price is relatively higher with cheap parts and drive chip, realize the reduction of production cost.
Meanwhile, above-mentioned PFC chip 502 can be PWM chip, or other can be 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 technique scheme according to an embodiment of the invention, by using the drive circuit 602 of above-mentioned LED array, and be integrated in this drive unit 600, thereby can be when removing special LED driving chip from, still can LED array be realized effectively and being driven, reduce production costs.
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 technique scheme according to an embodiment of the invention, by using the drive circuit 702 of above-mentioned LED array, can be when producing this display unit 700, remove special LED from and drive chip, but still can LED array be realized effectively and being driven, reduce production costs.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a drive circuit for LED array, is characterized in that, comprising:
Switch module, is connected to mainboard, utilizes from the mainboard signal of described mainboard and generates switching signal, and export described switching signal to driver module;
Described driver module, is connected to described switch module and light-adjusting module, under the control of the described switching signal from described switch module, to described light-adjusting module, sends and drives signal;
Described light-adjusting module, is connected to LED array, receives the described driving signal from described driver module, and produce dim signal, and described dim signal is sent to described LED array,
Wherein said driver module comprises that PFC drives chip, LC to drive chip and/or flyback control chip;
Negative pressure module, is connected to described LED array, when multiple described LED array array strings in series, applies positive voltage, and apply negative voltage at the other end of described array strings in one end of described array strings, and described array strings is driven;
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 obtaining is transferred to described driver module, by the voltage-regulation unit in described driver module, according to described sampled voltage, regulate described driving signal, described dim signal correspondingly changes under the adjusting of described driving signal, to keep the current constant of described LED array;
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 to proportional integral processing, and the proportional integral signal obtaining is transferred to the voltage revision unit in described driver module, by described voltage revision unit, according to described proportional integral signal, the signal attribute of described driving signal is revised, wherein said signal attribute comprises phase place, gain.
2. the drive circuit of LED array according to claim 1, is characterized in that, described switch module comprises:
The first switch element and threshold cell, described the first switch element is connected to described mainboard, reception is from the described mainboard signal of described mainboard, and according to the voltage swing of described mainboard signal, to described threshold cell, export corresponding voltage, make described threshold cell under the effect of described voltage, to described driver module, export described switching signal.
3. the drive circuit of LED array according to claim 2, is characterized in that, described the first switch element comprises: the first triode, and described threshold cell comprises: the first diode,
Wherein, the base stage pin of described the first triode is connected to described mainboard, reception is from the described mainboard signal of described mainboard, the collector electrode pin of described the first triode is connected to the reference voltage unit of described driver module and the first pin of described the first diode, described reference voltage unit provides reference voltage, and the emitter pin ground connection of described the first triode, and the second pin of described the first diode is connected to described driver module, to the receiving element of described driver module, send described switching signal, described receiving element is sent to the first comparing unit by the described switching signal receiving, described the first comparing unit is by described switching signal and default first threshold comparison, when described switching signal is greater than described first threshold, described the first comparing unit sends transmitted signal to the output unit in described driver module, described output unit receives after described transmitted signal, to described light-adjusting module, send described driving signal.
4. according to the drive circuit of the LED array described in any one in claims 1 to 3, it is characterized in that, described light-adjusting module comprises:
NMOS pipe, the grid pin of described NMOS pipe is connected to the output unit of described driver module, receive described driving 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 is exported described driving signal, the conducting of described NMOS pipe also sends described dim signal to described LED array.
5. the drive circuit of LED array according to claim 3, is characterized in that, also comprises:
The first protection module; be connected to described driver module and the first power supply; voltage to described the first power supply is sampled; and the sampling supply voltage obtaining is inputed to the second comparing unit in described driver module; described the second comparing unit compares described sampling supply voltage and default Second Threshold; when described sampling supply voltage is greater than described Second Threshold; described the second comparing unit sends stop signal to described output unit, and described output unit stops exporting described driving signal.
6. according to the drive circuit of the LED array described in claim 3 or 5, it is characterized in that, also comprise:
The 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 collecting and the 3rd threshold value are compared, and when described LED voltage is greater than described the 3rd threshold value, described receiving element in described driver module sends guard signal, described receiving element is sent to described the first comparing unit by described guard signal, and described the first comparing unit compares described guard signal and described first threshold, when described guard signal is less than described first threshold, make described the first comparing unit send stop signal to described output unit, described output unit stops exporting described driving signal.
7. the drive circuit of LED array according to claim 6, is characterized in that, described the second protection module comprises: the 3rd comparing unit and second switch unit, wherein,
Described the 3rd comparing unit comprises: the second triode, the base stage pin of described the second triode is connected to described LED array, obtain described LED voltage, the emitter pin of described the second triode is connected to the described reference voltage unit of described driver module, and the collector electrode pin of described the second triode is connected to described second switch unit, when described LED voltage is greater than described the 3rd threshold value, described the second triode conducting, and send the first Continuity signal to described second switch unit, the conducting voltage that described the 3rd threshold value is described reference voltage and described the second triode 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 the 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 the first Continuity signal, described the 3rd triode conducting, and send the 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 the first comparing unit, at described the 4th triode, receive after described the 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 the first comparing unit by described guard signal, and described the first comparing unit compares described guard signal and described first threshold, when described guard signal is less than described first threshold, described the first comparing unit sends described stop signal to described output unit, described output unit stops exporting described dim signal.
8. a drive unit for LED array, is characterized in that, comprises the drive circuit of the LED array as described in any one in claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110287258.0A CN102291901B (en) | 2011-09-23 | 2011-09-23 | Driving circuit and driving device for light emitting diode (LED) array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110287258.0A CN102291901B (en) | 2011-09-23 | 2011-09-23 | Driving circuit and driving device for light emitting diode (LED) array |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102291901A CN102291901A (en) | 2011-12-21 |
| CN102291901B true CN102291901B (en) | 2014-05-07 |
Family
ID=45337931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110287258.0A Active CN102291901B (en) | 2011-09-23 | 2011-09-23 | Driving circuit and driving device for light emitting diode (LED) array |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102291901B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4001856B2 (en) * | 2003-10-30 | 2007-10-31 | ローム株式会社 | LIGHT EMITTING ELEMENT DRIVE DEVICE, DISPLAY MODULE HAVING LIGHT EMITTING ELEMENT DRIVE DEVICE, AND ELECTRONIC DEVICE HAVING DISPLAY MODULE |
| CN101621872A (en) * | 2009-03-19 | 2010-01-06 | 青岛海信电器股份有限公司 | Driving circuit and projector |
| CN101711071B (en) * | 2009-11-25 | 2013-10-23 | 海洋王照明科技股份有限公司 | LED control circuit and LED device |
| CN201813591U (en) * | 2010-06-02 | 2011-04-27 | 杭州奥能照明电器有限公司 | Wireless drive system for LED (light emitting diode) |
| CN201804534U (en) * | 2010-09-04 | 2011-04-20 | 青岛海信电器股份有限公司 | Light-emitting diode (LED) drive circuit and television having same |
| CN202334988U (en) * | 2011-09-23 | 2012-07-11 | 青岛海信电器股份有限公司 | Driving circuit and driving device of light emitting diode (LED) array |
-
2011
- 2011-09-23 CN CN201110287258.0A patent/CN102291901B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102291901A (en) | 2011-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103988584B (en) | Utilize the light adjusting system of the lighting device of light-emitting component | |
| CN101916548B (en) | Control circuit of light-emitting diode (LED) lamp tube of liquid crystal display | |
| CN202404873U (en) | Constant voltage and constant current drive circuit of LED display screen | |
| CN104377971B (en) | A kind of flyback based on Voltage Feedback directly drives LED power circuit and television set | |
| CN203827560U (en) | LED stroboscopic and blasting flash circuit | |
| CN103533717A (en) | Electronic equipment based on direct current supply communication and control method thereof | |
| CN103458557A (en) | LED drive control circuit and LED lamp | |
| CN107787085A (en) | 0 10V of one kind light modulation isolation LED power circuits | |
| CN102448211A (en) | LED (Light Emitting Diode) for drive circuit | |
| CN102811527A (en) | LED frequency-variable marker lamp and control circuit and control method of marker lamp | |
| CN101925224A (en) | Constant-current dimming circuit and LED lamp | |
| CN201893979U (en) | High-power efficient constant-current light-emitting diode (LED) driver | |
| CN102291901B (en) | Driving circuit and driving device for light emitting diode (LED) array | |
| CN202475884U (en) | Light emitting diode (LED) driving device | |
| CN101813260A (en) | LED lamp device and PWM (Pulse Width Modulation) direct current supply control circuit | |
| CN104270875B (en) | LED (Light Emitting Diode)-driven control device and method | |
| CN202334988U (en) | Driving circuit and driving device of light emitting diode (LED) array | |
| CN108650750B (en) | LED linear full-voltage driving circuit | |
| CN203554757U (en) | Electronic device based on DC power-supplying communication | |
| CN102469666B (en) | Feedback voltage stabilizing circuit | |
| CN202172506U (en) | Light emitting diode (LED) drive circuit and constant current feedback circuit in same | |
| CN201682655U (en) | Multipath LED (Light-Emitting Diode) power supply device | |
| CN202206602U (en) | LED drive power supply | |
| CN206149552U (en) | A dimmer circuit for non - isolation LED drive power supply | |
| CN104080226B (en) | A kind of circuit controlling triode switch according to sample rate current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co., Ltd Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE ELECTRIC Co.,Ltd. |