CN103096593A - Light-emitting diode (LED) backlight driving circuit and liquid crystal television - Google Patents
Light-emitting diode (LED) backlight driving circuit and liquid crystal television Download PDFInfo
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Abstract
The invention provides a light-emitting diode (LED) backlight driving circuit which comprises a rectifying filtering circuit, a resonance control circuit and an isolation driving circuit, wherein the rectifying filtering circuit receives alternating current input and outputs first direct current to the resonance control circuit, the isolation driving circuit is connected to the resonance control circuit and is used for outputting a driving signal, the resonance control circuit receives the driving signal from the isolation driving circuit and outputs second direct current to an LED backlight according to the driving signal and the first direct current. The invention further provides a liquid crystal television. According to the technical scheme of the LED backlight driving circuit and the liquid crystal television, a secondary circuit is utilized to drive and control the primary resonance circuit to supply power to the backlight, design of an original power supplying circuit is greatly simplified, production cost is reduced, and space utilization rate of a circuit board is also improved.
Description
Technical field
The present invention relates to the Display Technique field, in particular to the LED-backlit source driving circuit with have the LCD TV of this LED-backlit source driving circuit.
Background technology
LED is as the backlight of LCD TV, in have the even more lamp bars of two-way at least on large-sized LCD TV.The power drives mode is that No. one booster circuit drives a paths of LEDs lamp bar, realizes that by the electric current of every street lamp bar of taking a sample each street lamp bar electric current equates, to satisfy the television image display requirement.Multi-path lamp strip is generally low pressure 24V input, adopts this kind mode generally need to be than multi-chip and peripheral component, and cost is higher.Therefore, increasing the quantity of every street lamp bar LED lamp, reduce lamp bar quantity, is the trend of current LED LCD TV backlight.
Current, 42 cun, 46 cun LED LCD TV have two-way or Multi-path lamp strip more, and the construction for electricity of employing and type of drive are as shown in Figure 1A and Figure 1B.
Figure 1A is the Power supply part, is made of PFC power supply 106, half-bridge resonance control chip 102, the control of LLC resonance and energy transfer circuit 104, produces the Voltage-output of 12V and 100V by switch transformer T1, in order to give secondary power supply.This Power supply partly needs half-bridge resonance control chip 102 and peripheral circuit thereof, and device is more.
Figure 1B is driving circuit section, controls with driving chip 110, has only shown in Figure 1B that drives the two-way that chip 110 is controlled, and four street lamp bars or Multi-path lamp strip are with the identical lamp number of same drive control circuit.The topological mode that every street lamp bar all uses Boost booster circuit 108 to boost, this Boost booster circuit 108 needs the metal-oxide-semiconductor that boosts (V3 or V5) and a light modulation metal-oxide-semiconductor (V4 or V6), and the output of every road all needs electrochemical capacitor (C5 or C6) to satisfy the LED normal operation.Therefore, this driving circuit section needs special driving chip to coordinate Boost topology peripheral circuit, and device is more.
Therefore, need a kind of LED-backlit source driving circuit of simplification, reduce the setting of components and parts, and then reduce production costs.
Summary of the invention
Consider the above-mentioned background technology, a goal of the invention of the present invention is to provide a kind of LED-backlit source driving circuit, can reduce the setting of components and parts, reduces production costs.
In view of this, according to an aspect of the present invention, provide a kind of LED-backlit source driving circuit, comprise: resonant control circuit and isolated drive circuit, wherein, described isolated drive circuit is connected to described resonant control circuit, is used for to described resonant control circuit output drive signal; Described resonant control circuit receives from the driving signal of described isolated drive circuit with from the first direct current of outside, according to described driving signal and described the first direct current to described LED-backlit source output the second direct current.
Technique scheme utilizes resonant control circuit directly to LED-backlit source power supply, need not too many peripheral components, simplified circuit design, and utilize isolated drive circuit to replace original driving chip and add booster circuit, simplified equally the circuit design of drive circuit, greatly reduce production cost, reduced taking up room of circuit board.
According to a further aspect in the invention, also provide a kind of LCD TV, comprised the LED-backlit source driving circuit described in above-mentioned technical scheme.
Because above-mentioned LED-backlit source driving circuit has been simplified circuit design, therefore adopted the LCD TV of this LED-backlit source driving circuit, equally can Decrease production cost, also meet the requirement of ultrathin trend.
Description of drawings
Figure 1A shows the schematic diagram of the power supply circuits part of power supply circuits in correlation technique;
Figure 1B shows the schematic diagram of the driving circuit section of power supply circuits in correlation technique;
Fig. 2 shows the block diagram of LED-backlit source driving circuit according to an embodiment of the invention;
Fig. 3 shows the schematic diagram of LED-backlit source driving circuit according to an embodiment of the invention;
Fig. 4 shows the drive waveforms figure of the first field-effect transistor in LED-backlit source driving circuit according to an embodiment of the invention;
Fig. 5 shows the drive waveforms figure of the second field-effect transistor in LED-backlit source driving circuit according to an embodiment of the invention;
Fig. 6 shows the current waveform figure of the first lamp bar according to an embodiment of the invention;
Fig. 7 shows the current waveform figure of the second lamp bar 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.Need to prove, in the situation that do not conflict, the application's embodiment and the feature in embodiment can make up mutually.
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 LED-backlit source driving circuit according to an embodiment of the invention.
As shown in Figure 2, LED-backlit source driving circuit 200 can comprise according to an embodiment of the invention: resonant control circuit 202 and isolated drive circuit 204, wherein, isolated drive circuit 204 is connected to described resonant control circuit 202, is used for to described resonant control circuit 202 output drive signals; Resonant control circuit 202 receives from the driving signal of described isolated drive circuit 204 with from first direct current of outside (for example current rectifying and wave filtering circuit 201), according to driving signal and the first direct current to LED-backlit source 210 output the second direct currents.Current rectifying and wave filtering circuit 201 receives to exchange inputs and exports the first direct current to resonant control circuit 202.
Technique scheme utilizes resonant control circuit directly to LED-backlit source power supply, need not too many peripheral components, simplified circuit design, and utilize isolated drive circuit to replace original driving chip and add booster circuit, simplified equally the circuit design of drive circuit, greatly reduce production cost, reduced taking up room of circuit board.
next with reference to figure 3, Fig. 3 shows the schematic diagram of LED-backlit source driving circuit according to an embodiment of the invention, as shown in Figure 3, resonant control circuit 202 comprises the first field-effect transistor V901, the second field-effect transistor V902, the first transformer T901, resonant capacitance C901 and rectification unit 212, wherein, the grid of the first field-effect transistor V901 and the second field-effect transistor V902 all is connected to the output of isolated drive circuit 204, the drain electrode of the first field-effect transistor V901 is connected to the output of current rectifying and wave filtering circuit 201, the drain electrode of the second field-effect transistor V902 is connected to the source electrode of the first field-effect transistor V901, the source ground of the second field-effect transistor V902, one end of the former limit winding of the first transformer T901 is connected to the node between the drain electrode of the source electrode of the first field-effect transistor V901 and the second field-effect transistor V902, the secondary winding of the first transformer T901 is connected to rectification unit 212, and the alternating current of the secondary winding output of rectification unit 212 reception the first transformer T901 is also exported the second direct current to LED-backlit source (lamp bar), the source electrode common ground of the end of resonant capacitance C901 and the second field-effect transistor V902, the other end of resonant capacitance C901 is connected to the other end of the former limit winding of the first transformer T901, by controlling the alternate conduction of the first field-effect transistor V901 and the second field-effect transistor V902, make magnetizing inductance, the resonant inductance of resonant capacitance C901 and the first transformer T901 produce resonance, energy is delivered to secondary by transformer.
As shown in Figure 3, isolated drive circuit 204 comprises the second transformer T902 and controller N901, wherein, the former limit winding of the second transformer T902 is connected to controller N901, the secondary winding of the second transformer T902 comprises the first coil and the second coil, one end of the first coil and an end of the second coil are connected to respectively the grid of the first field-effect transistor V901 and the second field-effect transistor V902, and the other end of the other end of the first coil and the second coil is connected to respectively the source electrode of the first field-effect transistor V901 and the second field-effect transistor V902; Controller N901 is to the former limit winding output drive signal of the second transformer T902, and the second transformer T902 is according to the driving signal frequency that drives signal adjustment the first field-effect transistor V901 and the second field-effect transistor V902.Therefore, resonant control circuit (also can be described as LLC resonance controls and energy transfer circuit) is by the alternate conduction of two field-effect transistors (metal-oxide-semiconductor), with PFC(Power Factor Correction, power factor correction) energy of the high voltage direct current that provides of power supply (current rectifying and wave filtering circuit 201 can comprise the PFC correcting circuit) is delivered to secondary by the first transformer T901.Can take full advantage of by rectification unit 212 energy that induces, be discharged on LED lamp bar, and what obtain is all malleation, be convenient to the detection of electric current and the protection of circuit.
Fig. 4 shows the drive waveforms figure of the first field-effect transistor in LED-backlit source driving circuit according to an embodiment of the invention.As shown in Figure 4, the waveform of the grid voltage of the first field-effect transistor is square wave, therefore, controls the break-make that can effectively drive the first field-effect transistor V901 by the driving of isolated drive circuit 204.In like manner, as shown in Figure 5, control the break-make that can effectively drive the second field-effect transistor V902 by the driving of isolated drive circuit 204, thereby control the energy transmission of resonant control circuit.
The LED-backlit source driving circuit can also comprise according to an embodiment of the invention: voltage detection unit 208, be connected to the negative terminal in LED-backlit source 210, the current voltage signal in detection LED-backlit source 210, the current voltage signal is sent to controller N901, controller N901 exports described driving signal according to the current voltage signal to the second transformer T902, to regulate described the second direct current.As can be seen from the figure, in the present embodiment, this voltage detection unit 208 comprises resistance R 938 and resistance R 939.Simultaneously, controller N901 also is used for when voltage detection unit 208 detects the current voltage signal less than the minimum threshold magnitude of voltage, to the second transformer T902 output isolation signals, to stop to LED-backlit source 210 power supplies.
In addition, resonant control circuit 202 can also comprise: balancing capacitance C905, be connected between the secondary winding and rectification unit 212 of the first transformer T901, when the first transformer T901 exports that two-way the second direct current is to LED-backlit source 210 at least, make the equal and opposite in direction of described the second direct current of two-way at least.In this technical scheme, regulate driving frequency by gathering the ohmically voltage of LED-backlit source negative terminal, thereby induce the voltage of demand, by the characteristic of LED lamp as can be known, electric current has relative proportional relation with the voltage at its two ends, therefore can adjust required electric current, the transformer secondary winding is in series with balancing capacitance in addition, make the electric current of two-way equate, thereby realize constant current.
In Fig. 3, the LED-backlit source can comprise two lamp bars or more lamp bar, in the present embodiment, supposes to have two lamp bars to be respectively the first lamp bar and the second lamp bar, the current waveform of the first lamp bar as shown in Figure 6, the current waveform of the second lamp bar is as shown in Figure 7.Can find out from Fig. 6 and Fig. 7, the current constant of each lamp bar, and the size of current of two lamp bars is consistent, has reached the constant current purpose.
For the further normal operation of protection power supply circuits, this LED-backlit source driving circuit can also comprise: protective circuit 206, gather the fault-signal in described LED-backlit source 210, and described fault-signal is fed back to controller N901; Controller N901 satisfies when pre-conditioned at fault-signal, to the second transformer T902 output isolation signals, to stop to source 210 power supplies of described LED-backlit.
In Fig. 3, rectification unit 212 comprises rectifier bridge; Protective circuit 206 comprises at least one sampling triode (V903 or V904); the base stage (can pass through resistance) of sampling triode is connected to the output diode of rectifier bridge; the collector electrode of sampling triode is connected to controller N901; when the output diode shorted to earth; the conducting of sampling triode; the lower voltage of collector electrode, trigger controller N901 is to the second described isolation signals of transformer T902 transmission.That is to say; when output diode generation shorted to earth fault; but protective circuit 206 trigger controller N901 protect; give the second transformer T902 by controller N901 output isolation signals; make it change the switching frequency of two field-effect transistors; thereby make the first transformer T901 can not induce alternating current, can measure less than transmission, stop the light source power supply of supporting or opposing.
As shown in Figure 3; protective circuit also comprises at least one unloaded detecting unit; be connected to the output of rectification unit; 210 when unloaded in described LED-backlit source; the detected voltage of described unloaded detecting unit raises and the voltage signal that detects is transferred to described controller N901; described controller N901 is at described voltage signal during higher than the max threshold magnitude of voltage, to described the second described isolation signals of transformer T902 transmission.In the present embodiment, this zero load detecting unit is resistance R 936 and/or resistance R 937.
Therefore, LED-backlit source driving circuit according to the present invention has been realized open-circuit-protection, the short-circuit protection of LED lamp bar: when LED lamp bar is opened a way, due to zero load, so the voltage on R936 or R937 can raise, the voltage of the VSNS pin of controller raises, and makes controller close greater than the threshold voltage of its overvoltage protection; When the high shorted to earth of LED lamp bar is arranged, if be the VD905 shorted to earth, diode VD903 conducting, make the voltage at UVS place be dragged down, trigger controller N901 protection, similarly, if VD903 shorted to earth, diode V904 conducting makes the voltage at UVS place be dragged down equally, trigger controller N901 protection; When the whole shorted to earth of two-way, the voltage at ISNS place impels controller N901 to close lower than its shutter voltage limit; High to low short circuit or low shorted to earth all can surpass or lower than the corresponding threshold level of chip I SNS pin, thus the protection of the controller N901 that sets out.Available common pulse width modulation controlled controller N901, the partial function Pin pin of this controller N901 as shown in Figure 3.(the second transformer T902) has three coils due to the isolation drive transformer; two elementary coils are controlled two metal-oxide-semiconductors; secondary line is connected to controller N901; so; the isolation drive transformer can transmit the secondary control signal of sending (being the isolation signals that controller sends) to elementary and can realize isolating voltage between primary and secondary, finally completes the protection action.
LCD TV, comprise as Fig. 2 or LED-backlit source driving circuit shown in Figure 3 according to an embodiment of the invention.Because above-mentioned LED-backlit source driving circuit has been simplified circuit design, therefore adopted the LCD TV of this LED-backlit source driving circuit, equally can Decrease production cost, also meet the requirement of ultrathin trend.
In sum, the present invention utilizes secondary circuit to control the primary resonant circuit directly to the power supply of lamp bar, add marginal BOOST driving chip by original former limit LLC driving chip and replace with controller by the direct driving LED lamp of transformer coupled control LLC bar, the drive circuit of big power LED backlight source is carried out simplified design, reduced production cost; Perfect simultaneously protective circuit makes the electric current in different output circuits reach equilibrium.
In the present invention, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance.Term " a plurality of " refers to two or more, unless clear and definite restriction is separately arranged.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and 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 (10)
1. a LED-backlit source driving circuit, is characterized in that, comprising: resonant control circuit and isolated drive circuit, wherein,
Described isolated drive circuit is connected to described resonant control circuit, is used for to described resonant control circuit output drive signal;
Described resonant control circuit receives from the driving signal of described isolated drive circuit with from the first direct current of outside, according to described driving signal and described the first direct current to described LED-backlit source output the second direct current.
2. LED-backlit source driving circuit according to claim 1, is characterized in that, described resonant control circuit comprises the first field-effect transistor, the second field-effect transistor, the first transformer, resonant capacitance and rectification unit, wherein,
The grid of described the first field-effect transistor and described the second field-effect transistor all is connected to the output of described isolated drive circuit, the drain electrode of described the first field-effect transistor is connected to the output of described current rectifying and wave filtering circuit, the drain electrode of described the second field-effect transistor is connected to the source electrode of described the first field-effect transistor, the source ground of described the second field-effect transistor;
One end of the former limit winding of described the first transformer is connected to the node between the drain electrode of the source electrode of described the first field-effect transistor and described the second field-effect transistor, the secondary winding of described the first transformer is connected to described rectification unit, and the alternating current of the secondary winding output of described the first transformer of described rectification unit reception is also exported described the second direct current;
One end of described resonant capacitance and the source electrode common ground of described the second field-effect transistor, the other end of described resonant capacitance is connected to the other end of the former limit winding of described the first transformer, by controlling the alternate conduction of described the first field-effect transistor and described the second field-effect transistor, make the magnetizing inductance of described resonant capacitance and described the first transformer, resonant inductance produce resonance.
3. LED-backlit source driving circuit according to claim 2, is characterized in that, described isolated drive circuit comprises the second transformer and controller, wherein,
The former limit winding of described the second transformer is connected to described controller, the secondary winding of described the second transformer comprises the first coil and the second coil, one end of described the first coil and an end of described the second coil are connected to respectively the grid of described the first field-effect transistor and described the second field-effect transistor, and the other end of the other end of described the first coil and described the second coil is connected to respectively the source electrode of described the first field-effect transistor and described the second field-effect transistor;
Described controller is to the described driving signal of former limit winding output of described the second transformer, and described the second transformer is adjusted the driving signal frequency of described the first field-effect transistor and described the second field-effect transistor according to described driving signal.
4. LED-backlit source driving circuit according to claim 3, is characterized in that, also comprises:
Voltage detection unit, be connected to the negative terminal in described LED-backlit source, detect the current voltage signal in described LED-backlit source, described current voltage signal is sent to described controller, described controller is exported described driving signal according to described current voltage signal to described the second transformer, to regulate described the second direct current.
5. LED-backlit source driving circuit according to claim 4, it is characterized in that, described controller also is used at described current voltage signal during less than the minimum threshold magnitude of voltage, to described the second transformer output isolation signals, to stop to the source power supply of described LED-backlit.
6. LED-backlit source driving circuit according to claim 3, is characterized in that, also comprises: protective circuit, gather the fault-signal in described LED-backlit source, and described fault-signal is fed back to described controller;
Described controller satisfies when pre-conditioned at described fault-signal, to described the second transformer output isolation signals, to stop to the source power supply of described LED-backlit.
7. LED-backlit source driving circuit according to claim 6, is characterized in that, described rectification unit comprises rectifier bridge;
Described protective circuit comprises at least one sampling triode; the base stage of described sampling triode is connected to the output diode of described rectifier bridge; the collector electrode of described sampling triode is connected to described controller; when described output diode shorted to earth; the conducting of described sampling triode; the lower voltage of described collector electrode triggers described controller to described the second described isolation signals of transformer transmission.
8. LED-backlit source driving circuit according to claim 6; it is characterized in that; described protective circuit also comprises at least one unloaded detecting unit; be connected to the output of described rectification unit; when unloaded in described LED-backlit source; the detected voltage of described unloaded detecting unit raises and also the voltage signal that detects is transferred to described controller, and described controller is at described voltage signal during higher than the max threshold magnitude of voltage, to described the second described isolation signals of transformer transmission.
9. the described LED-backlit source driving circuit of any one according to claim 2 to 8, it is characterized in that, described resonant control circuit also comprises: balancing capacitance, be connected between the secondary winding and described rectification unit of described the first transformer, when described the first transformer is exported at least described the second direct current of two-way to described LED-backlit source, make the equal and opposite in direction of described the second direct current of described two-way at least.
10. a LCD TV, is characterized in that, comprises LED-backlit source driving circuit as claimed in any one of claims 1-9 wherein.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310006622.0A CN103096593B (en) | 2012-11-19 | 2013-01-09 | Light-emitting diode (LED) backlight driving circuit and liquid crystal television |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210469525 | 2012-11-19 | ||
| CN2012104695250 | 2012-11-19 | ||
| CN201210469525.0 | 2012-11-19 | ||
| CN201310006622.0A CN103096593B (en) | 2012-11-19 | 2013-01-09 | Light-emitting diode (LED) backlight driving circuit and liquid crystal television |
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| CN103096593B CN103096593B (en) | 2017-05-03 |
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| CN104507216A (en) * | 2014-12-11 | 2015-04-08 | 昆山龙腾光电有限公司 | LED (Light Emitting Diode) driving circuit and liquid crystal display device employing same |
| CN105281577A (en) * | 2015-06-19 | 2016-01-27 | 惠科电子（深圳）有限公司 | Power amplifier power supply circuit and TV power strip |
| CN105741788A (en) * | 2016-04-22 | 2016-07-06 | 青岛海信电器股份有限公司 | Backlight drive circuit and display apparatus |
| CN108182911A (en) * | 2017-11-16 | 2018-06-19 | 青岛海信电器股份有限公司 | Liquid crystal display device, LED backlight circuit and LED light bar power supply circuit |
| WO2018214105A1 (en) * | 2017-05-25 | 2018-11-29 | 深圳和而泰智能照明有限公司 | Led driving circuit, led lighting apparatus, and electronic device |
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| CN107134262A (en) * | 2017-05-12 | 2017-09-05 | 惠州三华工业有限公司 | Low-power consumption display device |
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| CN104507216A (en) * | 2014-12-11 | 2015-04-08 | 昆山龙腾光电有限公司 | LED (Light Emitting Diode) driving circuit and liquid crystal display device employing same |
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| CN103096593B (en) | 2017-05-03 |
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