CN103096593B - 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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- CN103096593B CN103096593B CN201310006622.0A CN201310006622A CN103096593B CN 103096593 B CN103096593 B CN 103096593B CN 201310006622 A CN201310006622 A CN 201310006622A CN 103096593 B CN103096593 B CN 103096593B
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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 display technology field, in particular to LED backlight drive circuit and with the LED-backlit
The LCD TV of source driving circuit.
Background technology
LED as LCD TV backlight, at least even more many lamp bars of two-way on large-sized LCD TV in.
Power drives mode drives LED lamp bar all the way for booster circuit all the way, and each street lamp bar is realized per the electric current of street lamp bar by sampling
Electric current is equal, and to meet TV image requirement is shown.Multi-path lamp strip is generally the input of low pressure 24V, is typically needed using this kind of mode
It is relatively costly compared with multi-chip and peripheral component.Therefore, increase the quantity per street lamp bar LED, reduce lamp bar quantity, be
The trend of current LED liquid crystal television backlight.
Currently, 42 cun, 46 cun of LED liquid crystal televisions have two-way or more Multi-path lamp strip, the construction for electricity of employing and driving side
Formula is as shown in FIG. 1A and 1B.
Figure 1A is power supply power pack, by PFC power supplys 106, half-bridge resonance control chip 102, the control of LLC resonance and energy
Transfer circuit 104 is constituted, and by switch transformer T1 the voltage output of 12V and 100V is produced, to secondary power.The power supply
Power pack needs half-bridge resonance control chip 102 and its peripheral circuit, and device is more.
Figure 1B is driving circuit section, is controlled with driving chip 110, a driving chip 110 is only show in Figure 1B and is controlled
The two-way of system, four street lamp bars or Multi-path lamp strip are with same drive control circuit identical lamp bar number.Per street lamp bar all
The topological mode boosted using Boost circuit 108, the Boost circuit 108 needs a boosting metal-oxide-semiconductor (V3
Or V5) and light modulation metal-oxide-semiconductor (V4 or V6), and per road, output is required for electrochemical capacitor (C5 or C6) normal to meet LED
Work.Therefore, the driving circuit section needs special driving chip to coordinate Boost topology peripheral circuits, and device is more.
Accordingly, it would be desirable to a kind of LED backlight drive circuit of simplification, reduces the setting of components and parts, and then reduce producing into
This.
The content of the invention
In view of above-mentioned background technology, a goal of the invention of the present invention is to provide a kind of LED backlight drive circuit, can
The setting of components and parts is reduced, production cost is reduced.
In view of this, according to an aspect of the invention, there is provided a kind of LED backlight drive circuit, including：Resonance control
Circuit processed and isolated drive circuit, wherein, the isolated drive circuit is connected to the resonant control circuit, for described humorous
Control circuit output of shaking drive signal；The resonant control circuit, receive from the isolated drive circuit drive signal and
From the first outside direct current, the second direct current is exported to the LED backlight according to the drive signal and first direct current.
Above-mentioned technical proposal is powered using resonant control circuit directly to LED backlight, without the need for too many peripheral components, letter
Change circuit design, and original driving chip plus booster circuit has been substituted for using isolated drive circuit, equally simplify drive
The circuit design on galvanic electricity road, greatly reduces production cost, reduces taking up room for circuit board.
According to a further aspect in the invention, a kind of LCD TV is additionally provided, including as described in above-mentioned technical scheme
LED backlight drive circuit.
Because above-mentioned LED backlight drive circuit simplifies circuit design, therefore employ the LED backlight drive circuit
LCD TV, can equally reduce production cost, also comply with the requirement of ultrathin trend.
Description of the 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 backlight drive circuit according to an embodiment of the invention；
Fig. 3 shows the schematic diagram of LED backlight drive circuit according to an embodiment of the invention；
Fig. 4 shows the drive of the first field-effect transistor in LED backlight drive circuit according to an embodiment of the invention
Dynamic oscillogram；
Fig. 5 shows the drive of the second field-effect transistor in LED backlight drive circuit according to an embodiment of the invention
Dynamic oscillogram；
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.
Specific embodiment
It is below in conjunction with the accompanying drawings and concrete real in order to be more clearly understood that the above objects, features and advantages of the present invention
Apply mode to be further described in detail the present invention.It should be noted that in the case where not conflicting, the enforcement of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also
Implemented with being different from other modes described here using other, therefore, the present invention is not limited to following public concrete reality
Apply the restriction of example.
Fig. 2 shows the block diagram of LED backlight drive circuit according to an embodiment of the invention.
As shown in Fig. 2 according to an embodiment of the invention LED backlight drive circuit 200 can include：Resonance control electricity
Road 202 and isolated drive circuit 204, wherein, isolated drive circuit 204 is connected to the resonant control circuit 202, for institute
State the output drive signal of resonant control circuit 202；Resonant control circuit 202, receives the drive from the isolated drive circuit 204
Dynamic signal and the first direct current from outside (such as current rectifying and wave filtering circuit 201), carry on the back according to drive signal and the first direct current to LED
Light source 210 exports the second direct current.Current rectifying and wave filtering circuit 201 receives exchange and is input into and exports the first direct current to resonant control circuit
202。
Above-mentioned technical proposal is powered using resonant control circuit directly to LED backlight, without the need for too many peripheral components, letter
Change circuit design, and original driving chip plus booster circuit has been substituted for using isolated drive circuit, equally simplify drive
The circuit design on galvanic electricity road, greatly reduces production cost, reduces taking up room for circuit board.
With reference next to Fig. 3, Fig. 3 shows the schematic diagram of LED backlight drive circuit according to an embodiment of the invention,
As shown in figure 3, resonant control circuit 202 includes that the first field-effect transistor V901, the second field-effect transistor V902, first become
Depressor T901, resonant capacitance C901 and rectification unit 212, wherein, the first field-effect transistor V901 and the second field effect transistor
The grid of pipe V902 is connected to the outfan of isolated drive circuit 204, and the drain electrode of the first field-effect transistor V901 is connected to
The outfan of current rectifying and wave filtering circuit 201, the drain electrode of the second field-effect transistor V902 is connected to the first field-effect transistor V901
Source electrode, the source ground of the second field-effect transistor V902；One end of the primary side winding of the first transformator T901 is connected to
Node between the drain electrode of the source electrode of one field-effect transistor V901 and the second field-effect transistor V902, the first transformator T901
Vice-side winding be connected to rectification unit 212, rectification unit 212 receives the exchange of the vice-side winding output of the first transformator T901
Electricity simultaneously exports the second direct current and gives LED backlight (lamp bar)；One end of resonant capacitance C901 is with the second field-effect transistor V902's
Source electrode common ground, the other end of resonant capacitance C901 is connected to the other end of the primary side winding of the first transformator T901, passes through
The alternate conduction of the first field-effect transistor V901 and the second field-effect transistor V902 is controlled, resonant capacitance C901 and first is made
The magnetizing inductance of transformator T901, resonant inductance produce resonance, make energy be delivered to secondary by transformator.
As shown in figure 3, isolated drive circuit 204 includes the second transformator T902 and controller N901, wherein, the second transformation
The primary side winding of device T902 is connected to controller N901, and the vice-side winding of the second transformator T902 includes first coil and the second line
One end of circle, one end of first coil and the second coil is respectively connecting to the first field-effect transistor V901 and the second field effect is brilliant
The other end of the grid of body pipe V902, the other end of first coil and the second coil is respectively connecting to the first field-effect transistor
The source electrode of V901 and the second field-effect transistor V902；Primary side winding output drivings of the controller N901 to the second transformator T902
Signal, the second transformator T902 adjusts the first field-effect transistor V901 and the second field-effect transistor V902 according to drive signal
Driving signal frequency.Therefore, resonant control circuit (the alternatively referred to as control of LLC resonance and energy transfer circuit) passes through two fields
The alternate conduction of effect transistor (metal-oxide-semiconductor), by PFC (Power Factor Correction, power factor correction) power supply
The energy of the high voltage direct current that (current rectifying and wave filtering circuit 201 may include PFC correcting circuits) provides is passed by the first transformator T901
It is delivered to secondary.Induced energy can be made full use of by rectification unit 212, be discharged in LED lamp bar, and be obtained all
It is malleation, is easy to the detection of electric current and the protection of circuit.
Fig. 4 shows the drive of the first field-effect transistor in LED backlight drive circuit according to an embodiment of the invention
Dynamic oscillogram.As shown in figure 4, the waveform of the grid voltage of the first field-effect transistor is square wave, therefore, by isolation drive electricity
The drive control on road 204 can effectively drive the break-make of the first field-effect transistor V901.In the same manner, as shown in figure 5, being driven by isolating
The drive control on galvanic electricity road 204 can effectively drive the break-make of the second field-effect transistor V902, so as to control resonant control circuit
Energy transmission.
According to an embodiment of the invention LED backlight drive circuit can also include：Voltage detection unit 208, connection
To the negative terminal of LED backlight 210, the current voltage signal of LED backlight 210 is detected, current voltage signal is sent to into control
Device N901, controller N901 export the drive signal according to current voltage signal to the second transformator T902, described to adjust
Second direct current.It can be seen that in the present embodiment, the voltage detection unit 208 includes resistance R938 and resistance R939.
Meanwhile, controller N901 is additionally operable to when voltage detection unit 208 detects that current voltage signal is less than minimum threshold magnitude of voltage,
Isolation signals are exported to the second transformator T902, to stop being powered to LED backlight 210.
In addition, resonant control circuit 202 can also include：Balancing capacitance C905, is connected on the first transformator T901
Vice-side winding and rectification unit 212 between, the first transformator T901 export at least direct current of two-way second to LED backlight
When 210, the equal in magnitude of the second direct current described at least two-way is made.In the technical scheme, by gathering LED backlight negative terminal electricity
Voltage in resistance adjusting driving frequency, so as to induce the voltage of demand, from the characteristic of LED, electric current and its two ends
Voltage have a relative proportional relation, therefore required electric current can be adjusted out, in addition transformator secondary winding is in series with balance electricity
Hold so that the electric current of two-way is equal, so as to realize constant current.
In figure 3, LED backlight can include two lamp bars or more lamp bars, in this example, it is assumed that there is two
Lamp bar is respectively the first lamp bar and the second lamp bar, the current waveform of the first lamp bar as shown in fig. 6, the current waveform of the second lamp bar such as
Shown in Fig. 7.It can be seen from figures 6 and 7 that the current constant of each lamp bar, and the size of current of two lamp bars is consistent, reaches
Constant current purpose.
In order to further protect the normal work of power supply circuits, the LED backlight drive circuit can also include：Protection electricity
Road 206, gathers the fault-signal of the LED backlight 210, and the fault-signal is fed back to into controller N901；Controller
N901 exports isolation signals when fault-signal meets pre-conditioned to the second transformator T902, to stop to the LED-backlit
Source 210 powers.
In figure 3, rectification unit 212 includes rectifier bridge, and rectifier bridge has output diode VD903 and output diode
VD905, output diode VD903 and output diode VD905 provide respectively two-way output, and output diode VD903 is couple to
The emitter stage of audion V903 and the base stage of audion V904, output diode VD905 is couple to the emitter stage of audion V904
With the base stage of audion V903, wherein, the base stage of audion V904 is connected to its corresponding output diode VD903 by resistance,
The emitter stage of audion V904 is couple to output diode VD905 by resistance, defeated when output diode VD905 shorted to earths
Go out diode VD903 it is normal when, audion V904 is just turned on, and in saturation, the voltage of colelctor electrode is reduced, trigger controller
N901 to the second transformator T902 transmits the isolation signals.That is, when output diode occurs shorted to earth failure,
Protection circuit 206 can trigger controller N901 and be protected, and isolation signals are exported to the second transformator T902 by controller N901,
It is set to change the switching frequency of two field-effect transistors, so that the first transformator T901 can not induce alternating current, can
Measure less than transmission, stop light source power supply of supporting or opposing.
As shown in figure 3, protection circuit also includes at least one unloaded detector unit, the outfan of rectification unit is connected to,
When the LED backlight 210 is unloaded, voltage that the unloaded detector unit is detected is raised and by the voltage signal for detecting
Transmit to the controller N901, the controller N901 when the voltage signal is higher than max threshold magnitude of voltage, to described
Second transformator T902 transmits the isolation signals.In the present embodiment, the unloaded detector unit is resistance R936 and/or resistance
R937。
Therefore, LED backlight drive circuit of the invention realizes the open-circuit-protection of LED lamp bar, short-circuit protection：When
When LED lamp bar is opened a way, due to zero load, so the voltage on R936 or R937 can be raised, the voltage of the VSNS feet of controller is raised,
More than the threshold voltage of its overvoltage protection controller is closed；When there is the high shorted to earth of LED lamp bar, if it is VD905 pair
Ground short circuit, diode VD903 conductings so that the voltage at UVS is pulled low, trigger controller N901 protections, similarly, if
VD903 shorted to earths, diode V904 conductings, again such that the voltage at UVS is pulled low, trigger controller N901 protections；When
During two-way whole shorted to earth, the voltage at ISNS promotes controller N901 to close less than its protection threshold voltage；Height is to low short
Road or low shorted to earth all can be above or below the corresponding threshold levels of chip I SNS foot, so as to the guarantor of the controller N901 that sets out
Shield.Can be as shown in Figure 3 with common pulse width modulation controlled controller N901, the partial function Pin feet of controller N901.Due to every
There are three coils from driving transformer (the second transformator T902), two primary coils control two metal-oxide-semiconductors, and secondary line connects
Controller N901 is connected to, so, isolation drive transformator can transmit the control signal (isolation that i.e. controller sends that secondary sends
Signal) to voltage that is primary and being capable of achieving between isolation primary and secondary, it is finally completed protection act.
LCD TV according to an embodiment of the invention, including LED backlight drive circuit as shown in Figure 2 or Figure 3.By
Circuit design is simplified in above-mentioned LED backlight drive circuit, therefore employs the liquid crystal electricity of the LED backlight drive circuit
Depending on, production cost can be equally reduced, also comply with the requirement of ultrathin trend.
In sum, the present invention is powered using secondary circuit control primary resonant circuit directly to lamp bar, by original original
Side LLC driving chips add negative side BOOST driving chip to replace with controller by transformer coupled control LLC direct drive LED
Lamp bar, the drive circuit of big power LED backlight source is carried out to simplify design, reduces production cost；Simultaneously perfect protection electricity
Road, makes the electric current in different output circuits reach equilibrium.
In the present invention, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative
Importance.Term " multiple " refers to two or more, unless otherwise clearly restriction.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of LED backlight drive circuit, it is characterised in that include：Resonant control circuit and isolated drive circuit, wherein,
The isolated drive circuit is connected to the resonant control circuit, for resonant control circuit output driving letter
Number；
The resonant control circuit, receives from the drive signal of the isolated drive circuit and from the first outside direct current,
Second direct current is exported to the LED backlight according to the drive signal and first direct current；
Wherein, the resonant control circuit obtains described from the first outside direct current by current rectifying and wave filtering circuit；The resonance
Control circuit includes the first field-effect transistor, the second field-effect transistor, the first transformator, resonant capacitance and rectification unit,
The rectification unit includes rectifier bridge；And
The LED backlight drive circuit also includes：
Protection circuit, gathers the fault-signal of the LED backlight, and the fault-signal is fed back to into the isolated drive circuit
Controller, the protection circuit include at least two sampling audions, the rectifier bridge have and described at least two sampling
Corresponding at least two output diode of audion,
Wherein, when the rectifier bridge has the first output diode and the second output diode, first output diode
Two-way output is provided respectively with second output diode, and first output diode is couple to the transmitting of the first audion
Pole and the base stage of the second audion, second output diode is couple to the emitter stage of second audion and described first
The base stage of audion, wherein, the base stage of second audion is connected to its corresponding first output diode by resistance,
The emitter stage of second audion is couple to second output diode by resistance, when the current collection of first audion
Pole is connected with the colelctor electrode of second audion and the fault-signal outfan of controller is fed back to as protection circuit, described
The emitter stage of the first audion and second audion also respectively by emitter resistance be grounded, first audion send out
Emitter-base bandgap grading is also connected to the positive pole of the 3rd output diode, and the negative pole of the 3rd output diode is electric by be connected in series first
Resistance and second resistance ground connection, the junction point of the first resistor and the second resistance also with the colelctor electrode of second audion
It is connected, the second output diode shorted to earth, when first output diode is normal, second audion is just led
Logical, in saturation, the voltage of colelctor electrode is reduced, and is triggered the controller and is transmitted isolation signals to the second transformator；
The grid of first field-effect transistor and second field-effect transistor is connected to the isolated drive circuit
Outfan, the drain electrode of first field-effect transistor is connected to the outfan of the current rectifying and wave filtering circuit, described second
The drain electrode of effect transistor is connected to the source electrode of first field-effect transistor, and the source electrode of second field-effect transistor connects
Ground；
One end of the primary side winding of first transformator is connected to the source electrode and described second of first field-effect transistor
Node between the drain electrode of field-effect transistor, the vice-side winding of first transformator is connected to the rectification unit, described
Rectification unit receives the alternating current of the vice-side winding output of first transformator and exports second direct current；
The source electrode common ground of one end of the resonant capacitance and second field-effect transistor, the resonant capacitance it is another
End is connected to the other end of the primary side winding of first transformator, by controlling first field-effect transistor and described the
The alternate conduction of two field-effect transistors, makes magnetizing inductance of the resonant capacitance with first transformator, resonant inductance product
Raw resonance；
The isolated drive circuit includes second transformator and controller, wherein,
The primary side winding of second transformator is connected to the controller, and the vice-side winding of second transformator includes first
One end of coil and the second coil, one end of the first coil and second coil is respectively connecting to first field effect
The other end of the grid of transistor and second field-effect transistor, the other end of the first coil and second coil
It is respectively connecting to the source electrode of first field-effect transistor and second field-effect transistor；
The controller to the primary side winding of second transformator exports the drive signal, and second transformator is according to institute
State the driving signal frequency that drive signal adjusts first field-effect transistor and second field-effect transistor.
2. LED backlight drive circuit according to claim 1, it is characterised in that also include：
Voltage detection unit, is connected to the negative terminal of the LED backlight, detects the current voltage signal of the LED backlight, will
The current voltage signal is sent to the controller, and the controller is according to the current voltage signal to second transformation
Device exports the drive signal, to adjust second direct current.
3. LED backlight drive circuit according to claim 2, it is characterised in that the controller is additionally operable to described
When current voltage signal is less than minimum threshold magnitude of voltage, isolation signals are exported to second transformator, to stop to the LED
Backlight is powered.
4. LED backlight drive circuit according to claim 1, it is characterised in that the controller is believed in the failure
When number meeting pre-conditioned, isolation signals are exported to second transformator, to stop being powered to the LED backlight.
5. LED backlight drive circuit according to claim 4, it is characterised in that the protection circuit is also included at least
One unloaded detector unit, is connected to the outfan of the rectification unit, when the LED backlight is unloaded, the unloaded inspection
The voltage that survey unit is detected is raised and the voltage signal for detecting is transmitted to the controller, and the controller is in the electricity
When pressure signal is higher than max threshold magnitude of voltage, to second transformator isolation signals are transmitted.
6. LED backlight drive circuit according to any one of claim 1 to 5, it is characterised in that the resonance control
Circuit also includes：Balancing capacitance, is connected between the vice-side winding of first transformator and the rectification unit, described
The output of one transformator makes second direct current at least described in two-way when at least the second direct current is to the LED backlight described in two-way
It is equal in magnitude.
7. a kind of LCD TV, it is characterised in that include that the LED backlight as any one of claim 1 to 6 drives electricity
Road.
Priority Applications (1)
| 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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| CN201210469525.0 | 2012-11-19 | ||
| CN201210469525 | 2012-11-19 | ||
| CN2012104695250 | 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 true CN103096593B (en) | 2017-05-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN104507216B (en) * | 2014-12-11 | 2017-06-13 | 昆山龙腾光电有限公司 | LED drive circuit and use its liquid crystal display device |
| 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 |
| CN105741788B (en) * | 2016-04-22 | 2018-08-07 | 青岛海信电器股份有限公司 | Backlight drive circuit and display device |
| 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 |
| CN108182911B (en) * | 2017-11-16 | 2020-03-24 | 青岛海信电器股份有限公司 | Liquid crystal display device, LED backlight circuit and LED lamp strip power supply circuit |
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| KR101167807B1 (en) * | 2010-12-24 | 2012-07-25 | 삼성전기주식회사 | Resonant converter |
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| CN201984790U (en) * | 2011-04-20 | 2011-09-21 | 青岛海信电器股份有限公司 | Drive circuit and LCD TV |
| CN102243850A (en) * | 2011-06-27 | 2011-11-16 | 青岛海信电器股份有限公司 | Backlight source driving circuit and driving circuit thereof as well as liquid crystal television |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |