CN105392245A - An LED driver and a display device using the LED driver - Google Patents
An LED driver and a display device using the LED driver Download PDFInfo
- Publication number
- CN105392245A CN105392245A CN201510527101.9A CN201510527101A CN105392245A CN 105392245 A CN105392245 A CN 105392245A CN 201510527101 A CN201510527101 A CN 201510527101A CN 105392245 A CN105392245 A CN 105392245A
- Authority
- CN
- China
- Prior art keywords
- capacitor
- electrode
- led driver
- node
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The invention provides an LED driver and the display device using the LED driver. The LED driver comprises a power supply unit providing a drive current for a channel and a capacitor having a first electrode and a second electrode. The channel comprises a plurality of LEDs which are in series connection or parallel connection. The first electrode is connected to an output terminal of the power supply unit and the channel. The second electrode is grounded.
Description
This application claims the foreign priority rights and interests of the 10-2014-0110685 korean patent application submitted on August 25th, 2014, the full content of this application is contained in this by reference.
Technical field
Embodiments of the invention relate to a kind of LED driver and a kind of display device using this LED driver.
Background technology
Usually, due to trend that is miniaturized and high speed, as the electronic equipments such as mobile phone, FPD (flat-panel monitor) often produce EMI (electromagnetic interference) noise problem.And, due to the high frequency of switching frequency and the simplification of electromagnetic interface filter, make originally severe price competition problem become more serious.Particularly, for PFD, due to PFC (power factor correction), dc-dc and LED driver are connected in series, make to produce EMI noise at different frequency bands width.
And when using LED as FPD backlight, backlight can have multiple passages of being made up of multiple LED for launching uniform source of light.Further, the size of FPD is larger, and the length of each passage is longer, and passage can play the effect of the antenna that can discharge EMI noise, thus causes EMI noise problem more serious.And, although be provided with the bonnet weakening EMI noise, due to price competition aggravation, in order to save cost, the use of bonnet is reduced to and does not minimumly even use, and causes the sternness that the EMI radiation in FPD and conducting problem become.
Summary of the invention
In order to solve the problem described above invention the present invention, therefore, target of the present invention is to provide and a kind ofly can weakens electromagnetic wave noise and cheap LED driver and a kind of display unit using this LED driver.
According to the first embodiment of the invention in order to realize described target, a kind of LED driver being provided, comprising: power supply unit, providing drive current for the passage for comprising multiple LED connected in series or in parallel; Capacitor, has the first electrode and the second electrode, the first Electrode connection to power supply unit output and passage, the second electrode grounding.
According to the second embodiment of the invention in order to realize described target, a kind of display device is provided, comprise: display unit, for providing the LED driver of electric energy and the tuner unit for the frequency bandwidth that determines the picture signal by output for display unit, wherein, LED driver comprises: power supply unit, receive input power by input, and provide driving electric power to display unit; Passage, drives electric energy for the line receiver by being connected with lead-out terminal; And first capacitor, have and the first electrode of connection and second electrode on ground being connected to tuner unit.
To carry out part elaboration to other aspects and/or advantage in the following description, part in addition will be apparent by description, or understand by carrying out an invention.
Accompanying drawing explanation
By referring to the description of accompanying drawing to embodiment, these and/or other aspect and advantage will become clear and be easier to understand, in the accompanying drawings:
Fig. 1 shows the circuit diagram of the first embodiment according to LED driver of the present invention;
Fig. 2 shows the circuit diagram of the second embodiment according to LED driver of the present invention;
Fig. 3 A is the curve chart that waveform and the waveform of the electric current being applied to passage when being connected the first capacitor of electric current by being applied to passage when not connecting the first capacitor carries out contrasting;
Fig. 3 B is that the waveform of inductor and the voltage of interchannel first node when not connecting the first capacitor carries out with the waveform of the voltage of inductor and interchannel first node when being connected the first capacitor the curve chart contrasted;
Fig. 4 A shows the exploded view of first embodiment of the FPD using the LED driver shown in Fig. 1;
Fig. 4 B shows the exploded view of second embodiment of the FPD using the LED driver shown in Fig. 1;
Fig. 5 shows the schematic diagram of annexation between the distribution panelboard and tuner unit of the FPD shown in Fig. 4 B;
Fig. 6 A shows the curve chart of the EMI radiation waveform of the FPD not using bonnet and the first capacitor.
Fig. 6 B show when the FPD shown in Fig. 4 B does not use bonnet but uses the first capacitor the curve chart of EMI radiation waveform.
Embodiment
By reference to the detailed description of accompanying drawing showing the preferred embodiment of the present invention, to clearly understand the problem about operating effect, described operating effect comprises according to the technical configuration of LED driver of the present invention with the object of the display device of this LED driver of use.
In addition, when describing of the present invention, the description of known technology is eliminated, in order to avoid unnecessarily cause embodiments of the invention not easily to be understood.In this manual, the term such as " first " and " second " is for distinguishing an element and another element, and these elements do not limit by above-mentioned term.
In following detailed description of the present invention, with reference to showing the accompanying drawing can implementing specific embodiment of the present invention in an illustrative manner.These embodiments will be described enough detailed, implement these embodiments to enable those skilled in the art.To be well understood, although these embodiments are not identical, might not mutually repel.Such as, when not deviating from the spirit and scope of embodiment, special characteristic, structure or the characteristic etc. relevant with an embodiment described here, also can implement in other embodiments.In addition, will be well understood, when not deviating from the spirit and scope of embodiment, the position of each element in each disclosed embodiment can change with arrangement.Therefore, below describing in detail is not to limit, and the scope of embodiment is only defined by the claims, and whole conversion of the equivalent of the right required by claim are used for suitably explaining.In these figures, identical label indicates function identical or close in several view.
Those skilled in the art hereinafter, describes embodiments of the invention in detail with reference to the accompanying drawings, so that easily can implement the present invention.
Fig. 1 shows the circuit diagram of the first embodiment according to LED driver of the present invention, and Fig. 2 shows the circuit diagram of the second embodiment according to LED driver of the present invention.
With reference to Fig. 1, LED driver 110 can comprise for providing the power supply unit 111 of drive current to passage 120 and having the first capacitor C1 of the first electrode and the second electrode, wherein, passage 120 comprises at least one LED strip, described LED strip is connected in series with multiple LED (light-emitting diode), output and the passage 120 of the first electrode and power supply unit 111 are connected, the second electrode grounding.
Power supply unit 111 can comprise: inductor L, interrupteur SW, diode D and the second capacitor C2, wherein, one end of inductor L is connected with first node N1, the other end is connected with Section Point N2, dc-dc converter SW is by being connected to Section Point N2 by one end and by other end ground connection, control the sense of current (operating corresponding to on/off) flowing into inductor L, the anode of diode D is connected with Section Point N2, negative electrode is connected with the 3rd node N3, first electrode of the second capacitor C2 is connected with the 3rd node N3, second electrode is connected with first node N1.First electrode of the first capacitor C1 is connected with first node N1, and the second electrode is connected to ground.
And by receiving input power Vin, power supply unit 111 can provide drive current to passage 120.Although input power Vin can be DC power supply, be not limited to this.Power supply unit 111 can comprise the interrupteur SW for providing the inductor L of the drive current of default size and the size for the drive current that controls flow into inductor L.Interrupteur SW can control ON/OFF rate according to pwm signal, controls the amount of the drive current flowing into inductor L.Interrupteur SW can be as MOS transistor, FET or BJT etc. can the devices of switching current stream.And pwm signal flow into the amount of the drive current of passage 120 to control ON/OFF rate by sensing.Further, interrupteur SW changes the ON/OFF frequency of interrupteur SW by the frequency control signal received except pwm signal, and then can control the amount of the drive current flowing into inductor L.Further, power supply unit 111 comprises diode D, and between the diode D off period, diode D makes electric current unidirectional inflow inductor L.Here, although power supply unit 111 is described as downside step-down controller, it is only illustrate as an example, but not the restriction to power supply unit 111, power supply unit 111 can be LLC or boost converter etc.
Can be the multiple LED be connected in serial or parallel with each other from the passage 120 of power supply unit 111 received current.And passage 120 can be strip.In the earth-free situation of passage 120, it can play the effect of antenna, can shot noise.The length of passage is longer, easier radiated noise.Here, passage 120 is not limited to the situation comprising multiple LED, if the electric energy that it can consume is provided by the electric current flow through namely can as passage 120.
By being connected between passage 120 and ground by the first capacitor C1, the first capacitor C1 can be made as the path making passage 120 ground connection.Further, because the alternating component being applied to passage 120 transfers to ground by the first capacitor C1, so, the alternating component being applied to passage 120 can be made to minimize.Further, power supply unit 111 also comprises the second capacitor C2 being positioned at output.And, the large I of capacitance of the first capacitor C1 and the capacitance equal and opposite in direction of the second capacitor C2.In addition, the large I of capacitance of the first capacitor C1 is less than the capacitance size of the second capacitor C2.If the capacitance of the second capacitor C2 is less, because the noise channel caused by the second capacitor C2 can be formed in high frequency bandwidth, so noise easily can be transferred to ground.The size of capacitance is identical and do not mean that and mate completely; Nuance can be comprised.Because the first capacitor C1 and the second capacitor C2 is parallel-connected to passage 120, so, the amount of the electric current provided to passage 120 can be provided.
In addition, power supply unit 111 receives predetermined voltage by DC power supply.Now, although power supply unit 111 can receive predetermined voltage from DC power supply as shown in Figure 1,, it also can receive predetermined voltage by the 3rd capacitor C3 as shown in Figure 2.
Fig. 3 A is that the waveform of the electric current being applied to passage 120 when not connecting the first capacitor C1 is applied to the correlation curve figure of the waveform of the electric current of passage 120 with when being connected to the first capacitor C1, Fig. 3 B be the voltage of the first node between inductor L and passage 120 when not connecting the first capacitor C1 waveform and when being connected to the first capacitor C1 the correlation curve figure of the waveform of the voltage of first node between inductor L and passage 120.Now, the size of the inductor L of LED driver 110 is 400 μ H, and the input voltage transmitted under the state that the passage 120 being connected to LED driver 110 is 160 Ω at resistance is 135V, and, make the switching frequency of interrupteur SW reach 100kHz.A representative flows into the size of the electric current of the second capacitor C2 of LED driver 110 under the condition not connecting the first capacitor C1; B representative flows into the size of the electric current of the second capacitor C2 of LED driver 110 under the condition being connected to the first capacitor C1.In addition, a ' represents the size from the alternating component the voltage that LED driver 110 exports under the condition not connecting the first capacitor C1; B ' represents the size from the alternating component the voltage that LED driver 110 exports under the condition being connected to the first capacitor C1.
In addition, the electric current flowing into the passage 120 of LED driver 110 is 480mA, and the output voltage of power supply unit 111 is 85V.Now, as shown in Figure 3A, although before connection first capacitor C1, the ripple (difference of maxima and minima) of electric current is 0.86A; But after connection first capacitor C1, the ripple of electric current is 0.42A, its varying width reduces.In addition, as shown in Figure 3 B, before connection first capacitor C1, voltage ripple (difference of maxima and minima) is 11.09V; But after connection first capacitor C1, the varying width of voltage is also reduced to 5.37V.
Fig. 4 A shows the exploded view of the embodiment of the FPD of use LED driver 110 as shown in Figure 1, and Fig. 4 B shows the exploded view of second embodiment of the FPD of use LED driver 110 as shown in Figure 1.
With reference to Fig. 4 A and 4B, FPD1000 can comprise panel 10, optical sheet 20, waveguide plate 30, multiple passage 120a, cover 40, for generation of with provide the distribution panelboard 100 of electric energy, image plate 200 and for transfer control signal to control the feature board 300 of distribution panelboard 100 and image plate 200.As shown in Figure 4 A, FPD1000 also can comprise the bonnet 60 that size can cover distribution panelboard 100 and image plate 200.Here, can by panel 10, optical sheet 20, waveguide plate 30 and multiple passage 120a called after for showing the display unit of image on FPD1000.Panel 10 is by receiving drive singal and picture signal to show image from image plate 200.The optical transport that each LED from passage can send by optical sheet 20 and waveguide plate 30 is to panel 10.Multiple LED in the strip with preset length, and can be arranged in passage 120a by each passage 120a.The length of passage 120a can be determined corresponding to the size of FPD1000.Distribution panelboard 100 can be received input power Vin and be powered for image plate 200 and each passage 120a by circuit 50.Distribution panelboard 100 can comprise LED driver 110 as shown in Figure 1, to produce electric energy.Image plate 200 is utilized the electric energy that received by distribution panelboard 100 and operates, and picture signal and drive singal can be transferred to panel 10 by image plate 200.The exportable control signal of feature board 300 is to control distribution panelboard 100 and image plate 200.
As shown in Figure 4 A, when the size of bonnet 60 is very little, in FPD1000, because passage 120 is as shown in Figure 1 by the first capacitor C1 ground connection, so although the size of bonnet 60 is little, the AC signal being applied to passage 120 also can be transferred to ground swimmingly.Here, the size of bonnet 60 can be the size covering distribution panelboard 100 and image plate 200.And, as shown in Figure 4 B, even if when FPD1000 does not arrange bonnet 60, the AC signal of passage 120 is applied to also by ground connection (here, as shown in Figure 1, passage 120 is connected to other assemblies of FPD1000 by the first capacitor C1) and be transferred to ground swimmingly.Here, other elements of FPD are tuner unit, for determining the frequency bandwidth of the picture signal be presented on the display unit of FPD1000.And, can be the earth element of image plate 200 and feature board 300.
Fig. 5 shows the sketch of the distribution panelboard 100 of the FPD shown in Fig. 4 B and the annexation of tuner unit 400.
With reference to Fig. 5, distribution panelboard 100 comprises LED driver 110, and LED driver 110 comprises the first capacitor, wherein, LED driver 110 can comprise the first output end vo ut1 and the second output end vo ut2, and it is that multiple passage 120a powers that the second output end vo ut2 is used for by receiving input power Vin.First output end vo ut1 and the second output end vo ut2 powers respectively to each passage 120a and image plate 200 by first line 50.Can be different from each other to the electricity of the first output end vo ut1 confession and the electricity of the second output end vo ut2 confession, and large I is different from each other.And, although LED driver 110 is described for providing electric energy to the first output end vo ut1 and the second output end vo ut2, is not limited to this, also can produces the electric energy for exporting.And, first electrode of the first capacitor C1 is connected with the first output end vo ut1, and first line 50 is supplied to passage 120a from the first output end vo ut1 electric energy by the second circuit 50a, and second electrode of the first capacitor C1 can be connected to the ground of tuner unit 400 by the second circuit 50a.But the present invention is not limited to this; And, also can be connected to the ground of image plate 200 and feature board 300.
Tuner unit 400 can utilize second electrode grounding of the first capacitor C1.Therefore, the EMI noise composition of passage 120a transmitted by the first capacitor C1 is sent to the ground of tuner unit 400 by the first capacitor C1.
Fig. 6 A shows the curve chart of the EMI radiation waveform of the FPD not arranging bonnet 60 and the first capacitor, Fig. 6 B show illustrate in figure 4b bonnet 60 is not set but is provided with the curve chart of the EMI radiation waveform of the FPD of the first capacitor.Further, a representative is transmitted into the noise of horizontal direction, and b representative is transmitted into the noise of vertical direction.
With reference to Fig. 6 A and 6B, use display sizes is that the FPD of 48 inches tests, and FPD1000 need meet: when frequency is lower than 250MHz, and noise level is lower than 40dB, and if when frequency is more than 250MHz, noise level should lower than 48dB.But as shown in Figure 6A, when FPD does not only arrange bonnet and the first capacitor, EMI radiation level is lower than under the condition of 250MHz, and horizontal direction (a) and vertical direction (b) noise level reach the condition of 40dB once in a while.But, as shown in Figure 6B, when the first capacitor C1 is connected to output, although FPD1000 does not arrange bonnet, when frequency is lower than 250MHz, the condition of noise level lower than 40dB of horizontal direction and vertical direction still can be met.Further, even when EMI radiation level is more than 250MHz, in level (a) and vertical (b) both direction, EMI radiation level is lower than situation when not arranging the first capacitor.
According to LED driver of the present invention and the display unit using this driver, by utilizing simple structure attenuating noise to affect, solve the problem of EMI radiation and conduction.In addition, manufacturing cost can be saved.
In the scope of the claim of this specification, the element of means being described for performing specific function comprises performing any means of specific function, and these elements can comprise: arbitrary form software (described software kit is containing the combination of the circuit element in order to perform specific function) or firmware, the microcode be combined with the suitable circuit for being performed specific function by executive software.
" embodiment " mentioned when being described principle of the present invention, and the modification of this embodiment, refer to the specific features, structure and characteristics etc. relevant with embodiment at least one embodiment being included in the principle of the invention.Therefore, the phrase " in an embodiment " in multiple place and the statement of other changes might not all refer to same embodiment in full to appear at specification.
In the description, " connection " or " being connected with " that relate to, and other conversion, refer to an element be directly connected to another element or by other interelement grounding connection to another element.In specification full text, unless context clearly indicates, otherwise singulative comprises the implication of plural form.When this use term " comprise " and/or " including " time, except said modules, step, operation and/or equipment, do not get rid of exist or add other assembly, step, operation and/or equipment.
Claims (11)
1. a LED driver, comprising:
Power supply unit, for providing drive current for passage, described passage comprises the multiple LED being one another in series or being connected in parallel; And first capacitor, there is the second electrode with power supply unit output and described channel attached first electrode and ground connection.
2. LED driver according to claim 1, wherein, power supply unit comprises the second capacitor be connected with described output, and the second capacitor and the first capacitor are connected in series between output and ground.
3. LED driver according to claim 2, wherein, the capacitance size of the first capacitor is equal to or less than the capacitance of the second capacitor.
4. LED driver according to claim 1, wherein, power supply unit comprises switch, and described switch controls amount of drive current by performing the switching manipulation corresponding with amount of drive current.
5. LED driver according to claim 1, wherein, power supply unit is step-down transformer.
6. LED driver according to claim 1, wherein, power supply unit comprises:
Inductor, has the one end be connected with first node and the other end be connected with Section Point;
Switch, for by being connected with Section Point one end of switch and controlling other end ground connection coming to flow into the sense of current of inductor, described sense of current is corresponding with on/off operation;
First capacitor, has the second electrode of the first electrode and the ground connection be connected with first node;
Diode, has the anode be connected with Section Point and the negative electrode be connected with the 3rd node; And
Second capacitor, has the first electrode be connected with the 3rd node and the second electrode be connected with first node,
Wherein, the first Electrode connection of the first capacitor is to first node.
7. a display device, comprises
Display unit;
LED driver, for powering for display unit; And
Tuner unit, for determining the frequency bandwidth of the picture signal be presented in display unit,
Wherein, LED driver comprises:
Power supply unit, for receiving input power by input, and for by output for display unit provides driving electric energy;
Passage, drives electric energy for the line receiver by being connected with output, and
First capacitor, has and the first electrode of connection and the second electrode of being connected with the ground of tuner unit.
8. display device according to claim 7, wherein, power supply unit comprises the second capacitor, and the second capacitor is connected to output, and the second capacitor is connected in series with the first capacitor between output and ground.
9. display device according to claim 8, wherein, the capacitance size of the first capacitor is equal to or less than the capacitance size of the second capacitor.
10. display device according to claim 7, wherein, described power supply unit is step-down controller.
11. display devices according to claim 7, wherein, power supply unit comprises:
Inductor, has the one end being connected to first node and the other end being connected to Section Point;
Switch, for by being connected with Section Point one end of switch and controlling other end ground connection coming to flow into the sense of current of inductor, described sense of current is corresponding with on/off operation;
First capacitor, has the second electrode of the first electrode and the ground connection be connected with first node;
Diode, has the anode be connected with Section Point and the negative electrode be connected with the 3rd node; And
Second capacitor, has the first electrode be connected with the 3rd node and the second electrode be connected with first node,
Wherein, the first Electrode connection of the first capacitor is to first node.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140110685A KR101653783B1 (en) | 2014-08-25 | 2014-08-25 | Led driver and display for using the same |
| KR10-2014-0110685 | 2014-08-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105392245A true CN105392245A (en) | 2016-03-09 |
Family
ID=55423963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510527101.9A Pending CN105392245A (en) | 2014-08-25 | 2015-08-25 | An LED driver and a display device using the LED driver |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101653783B1 (en) |
| CN (1) | CN105392245A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106504710A (en) * | 2017-01-04 | 2017-03-15 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and liquid crystal display |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080008759A (en) * | 2006-07-21 | 2008-01-24 | 엘지이노텍 주식회사 | Resonance boost converter in led back-light driver |
| KR20090015609A (en) * | 2007-08-09 | 2009-02-12 | 엘지이노텍 주식회사 | Led driving circuit |
| KR20110023039A (en) | 2009-08-28 | 2011-03-08 | 주식회사 일호 | Supporting assembly for beam mold |
| KR101594855B1 (en) * | 2009-11-25 | 2016-02-18 | 삼성전자주식회사 | Back Light Unit and display apparatus |
| TWM411756U (en) * | 2011-04-21 | 2011-09-11 | Excelliance Mos Corp | Constant current driving circuit of light emitting diode and lighting apparatus |
-
2014
- 2014-08-25 KR KR1020140110685A patent/KR101653783B1/en active IP Right Grant
-
2015
- 2015-08-25 CN CN201510527101.9A patent/CN105392245A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106504710A (en) * | 2017-01-04 | 2017-03-15 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and liquid crystal display |
| US10446090B2 (en) | 2017-01-04 | 2019-10-15 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit and liquid crystal display |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20160024182A (en) | 2016-03-04 |
| KR101653783B1 (en) | 2016-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101786248B1 (en) | System and method for a switched-mode power supply | |
| US7592756B1 (en) | Driving circuit for light emitting diodes | |
| US11095209B2 (en) | Power supply control circuit, power supply device and electronic apparatus | |
| CN102185484A (en) | Switching power supply and control circuit and control method thereof | |
| CN102282522A (en) | Improved linearity in LED dimmer control | |
| CN105580497A (en) | Actuation mechanism for a mechanical diode assembly | |
| US8686645B2 (en) | LED protection circuit | |
| US20140049730A1 (en) | Led driver with boost converter current control | |
| KR20080046538A (en) | Driving apparatus for lighting light source | |
| CN102739061A (en) | Power supply method, power supply circuit and electronic equipment | |
| Zhang et al. | Modified zero‐voltage‐switching single‐stage LED driver based on Class E converter with constant frequency control method | |
| Cheng et al. | High‐power‐factor dimmable LED driver with low‐frequency pulse‐width modulation | |
| CN105392245A (en) | An LED driver and a display device using the LED driver | |
| CN102904453A (en) | Driving power supply for insulated gate bipolar translator (IGBT) | |
| CN202206620U (en) | Light emitting diode driving circuit | |
| Hwu et al. | Expandable two‐channel LED driver with galvanic isolation and automatic current balance | |
| US9615411B2 (en) | Backlight unit including a power transmitting wire | |
| CN103650600A (en) | Remote radio unit and related equipment | |
| Li et al. | Fixed‐frequency adaptive off‐time controlled buck current regulator with excellent pulse‐width modulation and analogue dimming for light‐emitting diode driving applications | |
| US9881589B2 (en) | Backlight source driving circuit and display apparatus | |
| JP6235281B2 (en) | LIGHT EMITTING ELEMENT DRIVE CIRCUIT, ITS CONTROL CIRCUIT, CONTROL METHOD, AND LIGHT EMITTING DEVICE AND ELECTRONIC DEVICE USING THE SAME | |
| JP5685015B2 (en) | LIGHT EMITTING DIODE DRIVING CIRCUIT AND LIGHT EMITTING DEVICE AND ELECTRONIC DEVICE USING THE SAME | |
| Kolla et al. | Input voltage controlled full‐bridge series resonant converter for LED driver application | |
| CN115664194A (en) | Electromagnetic interference modulation circuit, power management chip and display device | |
| CN104767404B (en) | Ultra-high voltage regulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160309 |