CN202178046U - Backlight drive circuit and television set - Google Patents
Backlight drive circuit and television set Download PDFInfo
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- CN202178046U CN202178046U CN2011202661392U CN201120266139U CN202178046U CN 202178046 U CN202178046 U CN 202178046U CN 2011202661392 U CN2011202661392 U CN 2011202661392U CN 201120266139 U CN201120266139 U CN 201120266139U CN 202178046 U CN202178046 U CN 202178046U
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Abstract
The utility model discloses a backlight drive circuit utilizing a primary half-bridge resonance circuit to directly drive and control a lamp bar circuit. The backlight drive circuit comprises a primary resonance circuit, a secondary lamp bar circuit and a light isolation reactive circuit taking the effect of optical coupler feedback, wherein the primary resonance circuit generates driving pulse signals based on received external voltage and current signals reported from the light isolation reactive circuit and provides necessary work voltage for the secondary lamp bar circuit in dependence on the driving pulse signals; the light isolation reactive circuit samples the current loaded in the secondary lamp bar circuit in real time and reports the feedback of the current signals to the primary resonance circuit. The backlight drive circuit utilizes the primary half-bridge resonance circuit to directly lighten and control the backlight and uses the optical coupler as the feedback control from the secondary to the primary. The drive circuit is simplified, LED driving chips on the secondary side are omitted and the device quantity of the whole system is reduced.
Description
Technical field
The utility model relates to a kind of backlight of LCD technical field, relates in particular to a kind of backlight source driving circuit and televisor.
Background technology
LED has been widely used in LCD TV as backlight.At present, in, large scale LED LCD TV backlight source has two-way even more lamp bars at least.The power drives mode is that No. one booster circuit drives a paths of LEDs lamp bar, realizes that through 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.Multichannel lamp bar is generally low pressure 24V input, adopts this kind mode generally to need more chip and peripheral component, and cost is higher.
Current, 42 cun, 46 cun LED LCD TVs have two-way or multichannel lamp bar more, the power supply framework of employing and type of drive such as Fig. 1.
The power supply power pack is made up of PFC power supply, half-bridge resonance control circuit, the control of LLC resonance and energy transfer circuit, and the voltage that produces 12V and 100V through switch transformer is exported, in order to give secondary power circuit 6.
Driving circuit section with chip for driving control, has only shown the two-way of a chip (drive controlling chip) control among Fig. 1, the drive controlling chip that the usefulness of multichannel lamp bar is same and the circuit of drive controlling chip are identical.The topological mode that every street lamp bar all uses Boost to boost, (V3, V5) (V4, V6), and the output of every road all needs electrochemical capacitor, and (C5 C6) satisfies the LED operate as normal with a light modulation metal-oxide-semiconductor to need the metal-oxide-semiconductor that boosts.This part needs the special driving chip to cooperate Boost topology peripheral circuit, and device is more.
The utility model content
To the problems referred to above, the purpose of the utility model is to provide a kind of backlight source driving circuit and televisor that utilizes the direct drive controlling lamp of primary half-bridge resonant circuit bar circuit.
For achieving the above object, the said a kind of backlight source driving circuit of the utility model comprises primary resonant circuit, secondary lamp bar circuit and the light isolation feedback circuit that plays the optocoupler retroactive effect, wherein,
The primary resonant circuit, the current signal that feeds back according to external voltage that receives and said smooth isolation feedback circuit produces drive pulse signal, and to said secondary lamp bar circuit required WV is provided according to this drive pulse signal;
The light isolation feedback circuit, the electric current of load in the said secondary lamp bar circuit of real-time sampling, and this current signal fed back to said primary resonant circuit.
Preferably, said primary resonant circuit comprises half-bridge resonance control circuit, the control of LLC resonance and energy transfer circuit and current rectifying and wave filtering circuit, wherein,
The half-bridge resonance control circuit, the current signal that receives in the real-time said secondary lamp bar circuit of gathering of external voltage and said current sampling circuit generates corresponding driving pulse signal and output;
Control of LLC resonance and energy transfer circuit receive the drive pulse signal of said half-bridge resonance control circuit output, and are transported in the said current rectifying and wave filtering circuit behind the external voltage resonance with reception;
Current rectifying and wave filtering circuit receives the voltage behind the resonance, and this voltage is carried out being transferred in the secondary lamp bar circuit after rectification and the filtering.
Preferably, said secondary lamp bar circuit is made up of a plurality of lamp bar series connection.
Preferably, the rectification circuit in the said current rectifying and wave filtering circuit adopts full-bridge rectification mode or half-bridge rectifier system all can.
Preferably, said external power source is controlled by the PFC power supply.
A kind of televisor comprises LCDs and backlight arrangement at least, and said backlight arrangement comprises backlight source module and backlight source driving circuit at least, and said backlight source driving circuit is above-mentioned any described backlight source driving circuit.
The beneficial effect of the utility model is:
The utility model through from the energy of elementary acquisition through behind rectification circuit and the filtering circuit, directly to secondary lamp bar circuit supply and luminous.And the electric current in the middle of the whole lamp bar circuit, by the control of light isolation feedback circuit, and the process photo-coupler feeds back to elementary half-bridge resonance control circuit control chip.Chip is according to the size of electric current; Through reducing switching frequency and reducing the driving pulse dutycycle energy that passes to LED is reduced; Perhaps improve switching frequency and the energy that passes to LED is raise, thereby realize the constant current control of LED with the dutycycle that increases driving pulse.The said backlight source driving circuit of the utility model is owing to adopted closed-loop control, and it more is prone to realize the stabilized driving to load in the circuit, and circuit is realized easily simple more.
The utility model utilizes the primary half-bridge resonant circuit directly to light and control backlight, and it is secondary to elementary FEEDBACK CONTROL to use optocoupler to do.The driving circuit of big power LED backlight source is carried out simplified design, saved the use of primary side LED chip for driving, reduced the device usage quantity of total system greatly.
Description of drawings
Fig. 1 is the synoptic diagram of backlight source driving circuit in the prior art;
Fig. 2 is the synoptic diagram of the said backlight source driving circuit of the utility model embodiment;
Fig. 3 is the experimental waveform figure of the first metal-oxide-semiconductor V1 among Fig. 2;
Fig. 4 is the experimental waveform figure of the second metal-oxide-semiconductor V2 among Fig. 2;
Fig. 5 is the experimental waveform figure of the first lamp bar among Fig. 2;
Fig. 6 is the experimental waveform figure of the second lamp bar among Fig. 2.
Embodiment
Below in conjunction with Figure of description the utility model is done further description.
As shown in Figure 2, the said a kind of backlight source driving circuit of the utility model embodiment comprises primary resonant circuit, secondary lamp bar circuit 4 and the light isolation feedback circuit that plays the optocoupler retroactive effect, wherein,
The primary resonant circuit, the current signal that feeds back according to external voltage that receives and said smooth isolation feedback circuit produces drive pulse signal, and to said secondary lamp bar circuit 4 required WV is provided according to this drive pulse signal;
Light isolation feedback circuit 5, the electric current of load in the said secondary lamp bar circuit of real-time sampling, and this current signal fed back to said primary resonant circuit.
As the further embodiment of the utility model, said primary resonant circuit comprises half-bridge resonance control circuit 1, the control of LLC resonance and energy transfer circuit 2 and current rectifying and wave filtering circuit 3, wherein,
Half-bridge resonance control circuit 1 receives external voltage and receives current signal generation corresponding driving pulse signal and the output in the real-time said lamp bar circuit of gathering of said smooth isolation feedback circuit;
Control of LLC resonance and energy transfer circuit 2 receive the drive pulse signal of said half-bridge resonance control circuit output, and are transported in the said current rectifying and wave filtering circuit behind the external voltage resonance with reception;
Current rectifying and wave filtering circuit 3 receives the voltage behind the resonance, and this voltage is carried out being transferred in the secondary lamp bar circuit after rectification and the filtering.
As the utility model embodiment further, said secondary lamp bar circuit is made up of a plurality of lamp bar series connection, and the voltage behind the reception rectifying and wave-filtering carries out luminous.
The principle of work of the utility model is: after opening switch, the PFC power supply begins to provide high-voltage dc voltage.The half-bridge resonance control chip obtains a level that makes the chip operate as normal through the dividing potential drop effect of related resistors, makes chip begin operate as normal and exports the driven pulse signal, and then control the alternate conduction of two metal-oxide-semiconductors.The alternate conduction of metal-oxide-semiconductor cooperates electric capacity and switch transformer formation LLC resonant circuit, and the energy delivery that will obtain from the PFC power supply is to secondary lamp bar circuit.From the energy of elementary acquisition through behind rectification circuit and the filtering circuit, directly to secondary lamp bar circuit supply and luminous.And the electric current in the middle of the whole lamp bar circuit, by the control of light isolation feedback circuit, and the process photo-coupler feeds back to elementary half-bridge resonance control circuit control chip.Chip is according to the size of electric current; Through reducing switching frequency and reducing the driving pulse dutycycle energy that passes to LED is reduced; Perhaps improve switching frequency and the energy that passes to LED is raise, thereby realize the constant current control of LED with the dutycycle that increases driving pulse.
Below in conjunction with a specific embodiment the said backlight source driving circuit of the utility model is done detailed explanation.
As shown in Figure 2, said half-bridge resonance control circuit comprises half-bridge resonance control chip N1, first resistance R 1 and second resistance R 2, wherein,
Half-bridge resonance control chip, its 5th pin Mlower, the 6th pin HB and the 7th pin Mupper all connect said LLC resonance control and energy transfer circuit; Its 4th pin FB connects the light isolation feedback circuit; Its second pin VCC connects the VCC power supply;
First resistance, its input end connects the output terminal of external voltage, and its output terminal connects the input end of second resistance and the first pin BO of said half-bridge resonance control chip;
Second resistance, its output head grounding and the 3rd pin GND that connects said half-bridge resonance control chip.
The first pin BO is connected between first resistance and second resistance, makes chip be able to startup work to obtain suitable voltage.The second pin VCC connects the VCC power supply, gives chip power supply.
Said LLC resonance control and energy transfer circuit comprise the first metal-oxide-semiconductor V1, the second metal-oxide-semiconductor V2, capacitor C 1 and switch transformer T1, wherein,
First metal-oxide-semiconductor; Its drain electrode connects the output terminal of external power source; Its grid connects the 7th pin Mupper of said half-bridge resonance control chip, and its source electrode is connected with the upper end of one group of coil of said switch transformer, the drain electrode of second metal-oxide-semiconductor and the 6th pin HB of said half-bridge resonance control chip respectively;
Second metal-oxide-semiconductor, its grid connect the 5th pin Mlower of said half-bridge resonance control chip, and its source ground also is connected with an end of said electric capacity;
Electric capacity, its other end connect the lower end of one group of coil of said switch transformer;
Switch transformer, its another group coil connects current rectifying and wave filtering circuit.
Control of LLC resonance and energy transfer circuit are through the alternate conduction of first metal-oxide-semiconductor and second metal-oxide-semiconductor; The energy of the high voltage direct current that the PFC power supply is provided is delivered in the secondary lamp bar circuit through switch transformer T1; The WV that is used for secondary lamp bar circuit lamp bar supplies the lamp bar luminous.
Rectification circuit in the said current rectifying and wave filtering circuit is made up of commutation diode, adopts full-bridge rectification mode or half-bridge rectifier system all can (not to draw among the figure).
Filtered electrical routing capacitance in the said current rectifying and wave filtering circuit constitutes (not drawing among the figure).
Said lamp bar circuit comprises the first lamp bar and the second lamp bar, wherein,
The first lamp bar, its anode connects the malleation output terminal of current rectifying and wave filtering circuit, and its negative electrode connects said smooth isolation feedback circuit;
The second lamp bar, its anode connect said smooth isolation feedback circuit, and its negative electrode connects the negative pressure output terminal of current rectifying and wave filtering circuit.
Wherein, do not limit, decide according to the demand of LCDs for the number of lamp bar.All lamp bars only need a control end to control for being connected in series, and compare with control mode one to one in the past, have saved the use of more chip and peripheral component.
Said smooth isolation feedback circuit comprises photo-coupler N2, parallel voltage-stabilizing integrated circuit N3, the 3rd resistance R 3, the 4th resistance R 4 and sampling resistor R5, wherein,
Photo-coupler, its first pin connects an end of the 3rd resistance; Its second pin connects the 3rd pin of parallel voltage-stabilizing integrated circuit; Its 3rd pin ground connection; Its 4th pin connects the 4th pin FB of said half-bridge resonance control chip;
The parallel voltage-stabilizing integrated circuit, its first pin connects an end of sampling resistor and the negative electrode that connects the first lamp bar; Its second pin connects the other end of sampling resistor and the anode that connects the second lamp bar;
The 3rd resistance, the end that its other end connects the Vin power supply and connects the 4th resistance;
The 4th resistance, its other end connect first pin of said parallel voltage-stabilizing integrated circuit.
The 4th pin FB of half-bridge resonance control chip connects the 4th pin of photo-coupler; To receive, adjust the frequency of operation of chip and the duty of drive pulse signal then and recently control elementary to secondary energy delivery from the secondary signal that feeds back through photo-coupler.The 3rd resistance plays the effect to the photo-coupler dividing potential drop, and the 4th resistance plays the effect to parallel voltage-stabilizing integrated circuit dividing potential drop.
Said parallel voltage-stabilizing integrated circuit detects the pressure drop on the sampling resistor through first pin.When sampling resistor exceeds the reference voltage of parallel voltage-stabilizing integrated circuit; Make the electric current of its 3rd leads ends increase; Thereby the electric current of first pin of the photo-coupler of flowing through and second leads ends also can increase, and this variation tendency is fed back on the 4th pin FB of half-bridge resonance control chip by photo-coupler.Chip increases situation according to the electric current of the 4th pin FB end, reduces switching frequency and reduces the driving pulse dutycycle energy that passes in the lamp bar circuit is reduced, thereby reduce the electric current in the lamp bar.Otherwise; When sampling resistor is lower than the reference voltage of parallel voltage-stabilizing integrated circuit; Make the electric current of its 3rd leads ends reduce; Thereby the electric current of first pin of the photo-coupler of flowing through and second leads ends also can reduce, and this variation tendency is fed back on the 4th pin FB of half-bridge resonance control chip by photo-coupler.Chip reduces situation according to the electric current of the 4th pin FB end, improves switching frequency and with increase driving pulse dutycycle the energy that passes in the lamp bar circuit is increased, thereby improve the electric current in the lamp bar.Pressure drop up to the sampling resistor two ends stabilizes to the reference voltage of parallel voltage-stabilizing integrated circuit, reaches a balance, realizes constant current control.
Said external power source reduces the interference to civil power by switch P FC power supply control, booster tension effectively utilize power, stable high-voltage dc voltage is provided.
For the driving method of said backlight source driving circuit, have illustratedly, its driving method comprises step:
The current signal of step 1, reception external voltage and circuit feedback produces the drive pulse signal that plays control action;
As the further explanation of this driving method, step 1 is concrete to be realized as follows:
1.1, the said half-bridge resonance control chip current signal that receives external voltage and circuit feedback produces high level pulse signal and low level pulse signal.
As the further explanation of this driving method, step 2 is concrete to be realized as follows:
2.1, high level pulse voltage signal and low level pulse voltage signal act synergistically on two metal-oxide-semiconductors (Fig. 3 and Fig. 4 are respectively the experimental waveform figure of the first metal-oxide-semiconductor V1 and the second metal-oxide-semiconductor V2), makes its alternately control, produces the resonance potential signal;
2.2, this resonance potential signal produces the required WV of secondary lamp bar circuit after rectification and filter action, the lamp bar luminous (Fig. 5 and Fig. 6 are respectively the experimental waveform figure of the first lamp bar and the second lamp bar) in the power supply road.
As the further explanation of this driving method, step 3 is concrete to be realized as follows:
3.1, in real time detect and the lamp bar circuit of sampling in the working current situation, and to said half-bridge resonance control chip transmission current signal;
3.2, draw the terminal voltage of said sampling resistor according to the current signal that samples, relatively this terminal voltage and reference voltage are controlled according to the result after the comparison again.As:
Terminal voltage equals reference voltage, and control chip is then exported the drive pulse signal identical with former output frequency;
Terminal voltage is greater than reference voltage, and control chip then reduces the frequency of the drive pulse signal of output;
Terminal voltage is less than reference voltage, then the raise frequency of drive pulse signal of output of control chip;
3.3, the drive pulse signal that produces of step 3.2, return step 2.1,2.2 and realize corresponding control.
Carry out illustrated in detail for step 3.2, can know:
When sampling resistor exceeds the reference voltage of parallel voltage-stabilizing integrated circuit; Make the electric current of its 3rd leads ends increase; Thereby the electric current of first pin of the photo-coupler of flowing through and second leads ends also can increase, and this variation tendency is fed back on the 4th pin FB of half-bridge resonance control chip by photo-coupler.Chip increases situation according to the electric current of the 4th pin FB end, reduces switching frequency and reduces the driving pulse dutycycle energy that passes in the lamp bar circuit is reduced, thereby reduce the electric current in the lamp bar.Otherwise; When sampling resistor is lower than the reference voltage of parallel voltage-stabilizing integrated circuit; Make the electric current of its 3rd leads ends reduce; Thereby the electric current of first pin of the photo-coupler of flowing through and second leads ends also can reduce, and this variation tendency is fed back on the 4th pin FB of half-bridge resonance control chip by photo-coupler.Chip reduces situation according to the electric current of the 4th pin FB end, improves switching frequency and with increase driving pulse dutycycle the energy that passes in the lamp bar circuit is increased, thereby improve the electric current in the lamp bar.Pressure drop up to the sampling resistor two ends stabilizes to the reference voltage of parallel voltage-stabilizing integrated circuit, reaches a balance, realizes constant current control.
A kind of televisor comprises LCDs and backlight arrangement at least, and said backlight arrangement comprises backlight source module and backlight source driving circuit at least, and said backlight source driving circuit is any one described backlight source driving circuit.
More than; Be merely the preferred embodiment of the utility model; But the protection domain of the utility model is not limited thereto; Any technician who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of the utility model.Therefore, the protection domain of the utility model should be as the criterion with the protection domain that claim was defined.
Claims (10)
1. a backlight source driving circuit is characterized in that, comprises primary resonant circuit, secondary lamp bar circuit and the light isolation feedback circuit that plays the optocoupler retroactive effect, wherein,
The primary resonant circuit, the current signal that feeds back according to external voltage that receives and said smooth isolation feedback circuit produces drive pulse signal, and to said secondary lamp bar circuit required WV is provided according to this drive pulse signal;
The light isolation feedback circuit, the electric current of load in the said secondary lamp bar circuit of real-time sampling, and this current signal fed back to said primary resonant circuit.
2. backlight source driving circuit according to claim 1 is characterized in that, said primary resonant circuit comprises half-bridge resonance control circuit, the control of LLC resonance and energy transfer circuit and current rectifying and wave filtering circuit, wherein,
The half-bridge resonance control circuit, the current signal that receives in the real-time said secondary lamp bar circuit of gathering of external voltage and said current sampling circuit generates corresponding driving pulse signal and output;
Control of LLC resonance and energy transfer circuit receive the drive pulse signal of said half-bridge resonance control circuit output, and are transported in the said current rectifying and wave filtering circuit behind the external voltage resonance with reception;
Current rectifying and wave filtering circuit receives the voltage behind the resonance, and this voltage is carried out being transferred in the secondary lamp bar circuit after rectification and the filtering.
3. backlight source driving circuit according to claim 1 is characterized in that, said secondary lamp bar circuit is made up of a plurality of lamp bar series connection.
4. backlight source driving circuit according to claim 2 is characterized in that, said half-bridge resonance control circuit comprises half-bridge resonance control chip, first resistance and second resistance, wherein,
Half-bridge resonance control chip, its 5th pin, the 6th pin and the 7th pin all connect said LLC resonance control and energy transfer circuit; Its 4th pin connects the light isolation feedback circuit; Its second pin connects the VCC power supply;
First resistance, its input end connects the output terminal of external voltage, and its output terminal connects the input end of second resistance and first pin of said half-bridge resonance control chip;
Second resistance, its output head grounding and the 3rd pin that connects said half-bridge resonance control chip.
5. backlight source driving circuit according to claim 2 is characterized in that, said LLC resonance control and energy transfer circuit comprise first metal-oxide-semiconductor, second metal-oxide-semiconductor, electric capacity and switch transformer, wherein,
First metal-oxide-semiconductor; Its drain electrode connects the output terminal of external power source; Its grid connects the 7th pin of said half-bridge resonance control chip, and its source electrode is connected with the upper end of one group of coil of said switch transformer, the drain electrode of second metal-oxide-semiconductor and the 6th pin of said half-bridge resonance control chip respectively;
Second metal-oxide-semiconductor, its grid connect the 5th pin of said half-bridge resonance control chip, and its source ground also is connected with an end of said electric capacity;
Electric capacity, its other end connect the lower end of one group of coil of said switch transformer;
Switch transformer, its another group coil connects current rectifying and wave filtering circuit.
6. backlight source driving circuit according to claim 2 is characterized in that, the rectification circuit in the said current rectifying and wave filtering circuit adopts full-bridge rectification mode or half-bridge rectifier system all can.
7. backlight source driving circuit according to claim 3 is characterized in that, said secondary lamp bar circuit comprises the first lamp bar and the second lamp bar, wherein,
The first lamp bar, its anode connects the malleation output terminal of current rectifying and wave filtering circuit, and its negative electrode connects said smooth isolation feedback circuit;
The second lamp bar, its anode connect said smooth isolation feedback circuit, and its negative electrode connects the negative pressure output terminal of current rectifying and wave filtering circuit.
8. backlight source driving circuit according to claim 1 is characterized in that, said smooth isolation feedback circuit comprises photo-coupler, parallel voltage-stabilizing integrated circuit, the 3rd resistance, the 4th resistance and sampling resistor, wherein,
Photo-coupler, its first pin connects an end of the 3rd resistance; Its second pin connects the 3rd pin of parallel voltage-stabilizing integrated circuit; Its 3rd pin ground connection; Its 4th pin connects the 4th pin of said half-bridge resonance control chip;
The parallel voltage-stabilizing integrated circuit, its first pin connects an end of sampling resistor and the negative electrode that connects the first lamp bar; Its second pin connects the other end of sampling resistor and the anode that connects the second lamp bar;
The 3rd resistance, the end that its other end connects the Vin power supply and connects the 4th resistance;
The 4th resistance, its other end connect first pin of said parallel voltage-stabilizing integrated circuit.
9. backlight source driving circuit according to claim 5 is characterized in that, said external power source is controlled by the PFC power supply.
10. televisor; At least comprise LCDs and backlight arrangement; Said backlight arrangement comprises backlight source module and backlight source driving circuit at least, it is characterized in that, said backlight source driving circuit is the described backlight source driving circuit of any claim among the claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202661392U CN202178046U (en) | 2011-07-26 | 2011-07-26 | Backlight drive circuit and television set |
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| CN2011202661392U CN202178046U (en) | 2011-07-26 | 2011-07-26 | Backlight drive circuit and television set |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222490A (en) * | 2011-07-26 | 2011-10-19 | 青岛海信电器股份有限公司 | Back light source drive circuit and television |
| CN102752918A (en) * | 2012-06-15 | 2012-10-24 | 福建捷联电子有限公司 | Half-bridge-structure LED (light-emitting diode) drive circuit controlled by secondary side |
| WO2014153883A1 (en) * | 2013-03-29 | 2014-10-02 | 深圳市华星光电技术有限公司 | Backlight drive circuit and drive method thereof, and liquid crystal display device |
| CN104871643A (en) * | 2012-12-21 | 2015-08-26 | 赤多尼科两合股份有限公司 | Master-slave system on the secondary side of a galvanic isolation barrier (selv barrier) of an operating unit |
| US9269306B2 (en) | 2013-03-29 | 2016-02-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and method for driving the backlight driving circuit |
| CN105405410A (en) * | 2015-11-20 | 2016-03-16 | 青岛海信电器股份有限公司 | Backlight driving circuit and driving method and display device thereof |
| CN106531087A (en) * | 2016-11-29 | 2017-03-22 | 深圳市华星光电技术有限公司 | Backlight drive circuit and liquid crystal display |
| CN109831846A (en) * | 2019-02-20 | 2019-05-31 | 江苏科谷电子有限公司 | A kind of LCC route adds LEDset2.0 can setting electric current route |
| CN111315076A (en) * | 2020-03-24 | 2020-06-19 | 深圳创维－Rgb电子有限公司 | LED power supply system and device |
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2011
- 2011-07-26 CN CN2011202661392U patent/CN202178046U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222490A (en) * | 2011-07-26 | 2011-10-19 | 青岛海信电器股份有限公司 | Back light source drive circuit and television |
| CN102752918A (en) * | 2012-06-15 | 2012-10-24 | 福建捷联电子有限公司 | Half-bridge-structure LED (light-emitting diode) drive circuit controlled by secondary side |
| CN102752918B (en) * | 2012-06-15 | 2015-11-04 | 福建捷联电子有限公司 | A kind of LED drive circuit of half bridge architecture controlled by primary side |
| CN104871643A (en) * | 2012-12-21 | 2015-08-26 | 赤多尼科两合股份有限公司 | Master-slave system on the secondary side of a galvanic isolation barrier (selv barrier) of an operating unit |
| WO2014153883A1 (en) * | 2013-03-29 | 2014-10-02 | 深圳市华星光电技术有限公司 | Backlight drive circuit and drive method thereof, and liquid crystal display device |
| US9269306B2 (en) | 2013-03-29 | 2016-02-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and method for driving the backlight driving circuit |
| CN105405410A (en) * | 2015-11-20 | 2016-03-16 | 青岛海信电器股份有限公司 | Backlight driving circuit and driving method and display device thereof |
| CN106531087A (en) * | 2016-11-29 | 2017-03-22 | 深圳市华星光电技术有限公司 | Backlight drive circuit and liquid crystal display |
| CN106531087B (en) * | 2016-11-29 | 2019-02-12 | 深圳市华星光电技术有限公司 | A kind of backlight drive circuit and liquid crystal display |
| CN109831846A (en) * | 2019-02-20 | 2019-05-31 | 江苏科谷电子有限公司 | A kind of LCC route adds LEDset2.0 can setting electric current route |
| CN111315076A (en) * | 2020-03-24 | 2020-06-19 | 深圳创维－Rgb电子有限公司 | LED power supply system and device |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Video Technology Co., Ltd Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120328 |