CN202799282U - Drive circuit for luminescence diode - Google Patents
Drive circuit for luminescence diode Download PDFInfo
- Publication number
- CN202799282U CN202799282U CN2012203658211U CN201220365821U CN202799282U CN 202799282 U CN202799282 U CN 202799282U CN 2012203658211 U CN2012203658211 U CN 2012203658211U CN 201220365821 U CN201220365821 U CN 201220365821U CN 202799282 U CN202799282 U CN 202799282U
- Authority
- CN
- China
- Prior art keywords
- coupled
- light
- drive circuit
- order
- switch
- 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.)
- Expired - Fee Related
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The utility model provides a drive circuit for a luminescence diode and the drive circuit includes s a power converter and a luminescence diode unit, wherein the power converter includes a first capacitor; a coil; a first switch; a diode having a first end and a second end, wherein the first end is coupled with the second end of the coil and the second end is used for outputting output voltage; and a control circuit for generating control signals and optical adjustment signals. The luminescence diode unit is coupled with the output voltage of the power converter. The drive circuit is simple in a structure and is convenient for controlling every luminescence element of the luminescence diode unit. Unnecessary circuit elements are reduced in the circuit. The drive circuit has effects of reducing electric energy loss and achieving energy saving.
Description
Technical field
The utility model relates to a kind of drive circuit of light-emittingdiode, espespecially a kind of several light-emittingdiode lamp bars that utilize series system to connect the light-emitting diodes body unit are so that the drive circuit of the identical light-emittingdiode of the electric current of several light-emittingdiode lamp bars of the light-emitting diodes body unit of flowing through.
Background technology
In the prior art, LCD TV or the backlight module of LCD monitor have several light-emittingdiode lamp bars usually.Therefore, LCD TV or the backlight module of LCD monitor can according to the open and close of several light-emittingdiode lamp bars, be controlled the backlight of LCD TV or LCD monitor.Because LCD TV or the backlight module of LCD monitor have several light-emittingdiode lamp bars, so the drive circuit of light-emittingdiode must have several the corresponding switches that are coupled to several light-emittingdiode lamp bars, to control the open and close of each light-emittingdiode lamp bar.So, prior art will have following shortcoming: the first, because each light-emittingdiode lamp bar has a corresponding switch, so the drive circuit of light-emittingdiode has expensive and makes consuming time; The second, because each light-emittingdiode lamp bar has a corresponding switch, so may have error between the electric current of several light-emittingdiode lamp bars of flowing through, cause the backlight wayward of LCD TV or LCD monitor; Three, because each light-emittingdiode lamp bar has a corresponding switch, so the drive circuit of light-emittingdiode consumes energy.Therefore, for LCD TV or the backlight module of LCD monitor, the drive circuit of the light-emittingdiode of prior art is not the drive circuit of a good light-emittingdiode.
The utility model content
The purpose of this utility model is to provide a kind of drive circuit of light-emittingdiode, and its circuit is simple, energy-conservation, be convenient to control.
For achieving the above object, the utility model provides a kind of drive circuit of light-emittingdiode, comprise, and power converter, in order to receiving direct voltage, and this direct voltage that boosts is output voltage, this power converter comprises:
The first electric capacity has first end and the second end, and wherein first end is in order to receive this direct voltage, and the second end in order to hold with being coupled to;
Coil has first end and the second end, and wherein first end is coupled to the first end of this first electric capacity;
The first switch has first end, the second end and the 3rd end, and wherein first end is coupled to the second end of this coil;
Diode has first end and the second end, and this first end is coupled to the second end of this coil, and this second end is in order to export this output voltage; And
Control circuit, have first end, the second end, the 3rd end and the 4th end, wherein first end is coupled to the second end of this first switch, in order to the electric current according to this first switch of flowing through, produce the control signal, to control the open and close of this first switch, this second end is in order to detect this electric current, the 4th end is in order to export a light modulation signal; And
The light-emitting diodes body unit is coupled to the output voltage of this power converter.
Better, this light-emitting diodes body unit is to be in series by several light-emittingdiode lamp bars.
Wherein, these several light-emittingdiode lamp bars are to connect with series system by flap or printed circuit board (PCB).
Better, this power converter comprises in addition, and sensing resistor has first end and the second end, and wherein first end is coupled to the 3rd end of this first switch, and its second end is coupled to this ground end, and this sensing resistor system is in order to senses flow this electric current through this first switch; And the second electric capacity, have first end and the second end, wherein first end is coupled to the second end of this diode, and the second end is coupled to this ground end.
Better, this power converter also comprises rectifier, have first end, the second end, the 3rd end and the 4th end, wherein first end is coupled to the anode of AC power, in order to receive alternating voltage, the second end is coupled to the first end of this first electric capacity, in order to export this direct voltage, the 3rd end is coupled to the negative terminal of this AC power, and the 4th end is coupled to this ground end.
Better, when this first switch was opened according to this control signal, this coil was in order to store electrical energy.
Better, this control signal is to be the pulse width modulation signal.
Better, when this electric current during greater than the predetermined current value, this control circuit produces overcurrent protection according to this electric current, and control signal CS and close this moment, and the first switch no current passes through.
Better, this power converter comprises bleeder circuit in addition, has, and first end is coupled to the second end of this diode; The second end is in order to export the first voltage to the 3rd end of this control circuit; The 3rd end couples; Wherein when the first voltage during greater than scheduled voltage, this control circuit produces overvoltage protection according to this first voltage, and control signal CS and open this moment.
Better, this power converter also comprises second switch, and it has, and first end is coupled to the second end of this light-emitting diodes body unit; The second end is coupled to the 4th end of this control circuit, in order to receive this light modulation signal; The 3rd end is coupled to this ground end.
Better, when this first switch cut out according to this control signal, this coil was in order to discharge stored electric energy.
Better, this light-emitting diodes body unit is to be straight-down negative light-emitting diodes body unit.Compare with prior art, one group of power converter of light-emittingdiode units shared in the utility model, only just realize control to whole light-emitting diodes body unit with a switch, energising and simultaneously disconnection when can realize the device in the light-emitting diodes body unit, so simple in structure, be convenient to control each light-emitting component of light-emitting diodes body unit, and circuit reduced unnecessary circuit element, had the electric energy loss of minimizing, reach energy-conservation effect.
Description of drawings
Fig. 1 is the schematic diagram of the drive circuit of a kind of light-emittingdiode of the utility model.
[main element symbol description]
100 drive circuits, 102 power converters, 104 light-emitting diodes body units
1,022 first electric capacity, 1024 coils, 1,026 first switches
1028 sensing resistor, 1030 control circuits, 1032 diodes
1,034 second electric capacity, 1036 rectifiers, 1038 bleeder circuits
1039 second switches, 1042 flaps
CS control signal DS light modulation signal GND ground end
ID, ILED electric current I L1-IL5 light-emittingdiode lamp bar SAC AC power
V1 the first voltage VAC alternating voltage VDC direct voltage
VOUT output voltage V S sensing voltage
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.
Please refer to shown in Figure 1ly, be the schematic diagram of the drive circuit 100 of a kind of light-emittingdiode of the utility model.Drive circuit 100 comprises power converter 102 and light-emitting diodes body unit 104, and wherein power converter 102 is to receive direct voltage VDC, and voltage boosting dc voltage VDC is output voltage VO UT.As shown in Figure 1, power converter 102 comprises the first electric capacity 1022, coil 1024, the first switch 1026, sensing resistor 1028, control circuit 1030, diode 1032 and the second electric capacity 1034.The first electric capacity 1022 has first end, in order to receive direct voltage VDC, reaches the second end, and in order to hold GND, wherein the first electric capacity 1022 is in order to stable DC voltage VDC with being coupled to.Coil 1024 has first end, is coupled to the first end of the first electric capacity 1022, and the second end.The first switch 1026 has first end, is coupled to the second end of coil 1024, the second end, and the 3rd end.Sensing resistor 1028 has first end, is coupled to the 3rd end of the first switch 1026, and the second end, holds GND with being coupled to, and wherein sensing resistor 208 is in order to the electric current I D of senses flow through the first switch 1026.Control circuit 1030 has first end, be coupled to the second end of the first switch 1026, in order to the sensing voltage VS that the electric current I D according to first switch 206 of flowing through produces, produce a control signal CS, to control the open and close of the first switch 1026, the second end, in order to detecting current ID, the 3rd end, and the 4th end, in order to export a light modulation signal DS, wherein the model of control circuit 1030 system can be LD 7889, and control signal CS is the pulse width modulation signal that comprises ON time and deadline.Diode 1032 has first end, is coupled to the second end of coil 1024, and the second end, in order to export output voltage VO UT to the first end of light-emitting diodes body unit 104.The second electric capacity 1034 has first end, is coupled to the second end of diode 1032, and the second end, end GND with being coupled to.This structure realizes unified power supply and outage to light-emitting diodes body unit 104, is convenient to control.
Also please refer to shown in Figure 1ly, wherein power converter 102 comprises rectifier 1036, bleeder circuit 1038 and second switch 1039 in addition.Rectifier 1036 has first end, is coupled to the anode of AC power SAC, in order to receive alternating voltage VAC, the second end, be coupled to the first end of the first electric capacity 1022, in order to output dc voltage VDC, the 3rd end, be coupled to the negative terminal of AC power SAC, and the 4th end, end GND with being coupled to.Bleeder circuit 1038 has first end, is coupled to the second end of diode 1032, and the second end in order to according to output voltage VO UT, is exported the first voltage V1 to the 3rd end of control circuit 1030, and the 3rd end, end GND with being coupled to.Second switch 1039 has first end, is coupled to the second end of light-emitting diodes body unit 104, and the second end is coupled to the 4th end of control circuit 1030, in order to receiving light modulation signal DS, and the 3rd end, hold GND with being coupled to.Because light modulation signal DS can be pulse width modulation signal, high potential signal or electronegative potential signal, so second switch 1039 can be according to light modulation signal DS, the brightness of control light-emitting diodes body unit 104, that is second switch 1039 can be according to light modulation signal DS, the flow through electric current I LED of light-emitting diodes body unit 104 of adjustment is with the brightness of control light-emitting diodes body unit 104.In addition, light-emitting diodes body unit 104 is to be in series with several light-emittingdiode lamp bars (for example 5 light-emittingdiode lamp bar IL1-IL5), so the electric current of 5 the light-emittingdiode lamp bar IL1-IL5 that flow through is to equal electric current I LED.So, the brightness meeting of each light-emittingdiode among 5 light-emittingdiode lamp bar IL1-IL5 is identical.But the utility model is not limited to light-emitting diodes body unit 104 comprises 5 light-emittingdiode lamp bar IL1-IL5, also can comprise the light-emitting diodes lamp bar below 5 or more than 5.In addition, light-emitting diodes body unit 104 is to be straight-down negative light-emitting diodes body unit, that is light-emitting diodes body unit 104 is the belows that are arranged at a liquid crystal panel, and light-emitting diodes body unit 104 is emission of lights up.In addition, the cross-pressure of each light-emittingdiode lamp bar of 5 light-emittingdiode lamp bar IL1-IL5 is to be higher than 30V, and 5 light-emittingdiode lamp bar IL1-IL5 see through flap 1042 to connect with series system.In another embodiment of the present utility model, 5 light-emittingdiode lamp bar IL1-IL5 see through printed circuit board (PCB) 1042 to connect with series system.
Continue with reference to shown in Figure 1, rectifier 1036 is in order to rectified AC voltage VAC, with produce and output dc voltage VDC to coil 1024.Coil 1024, the first switch 1026 and diode 1032 are to become output voltage VO UT in order to voltage boosting dc voltage VDC, and wherein output voltage VO UT drives light-emitting diodes body unit 104.When the first switch 1026 was opened according to control signal CS, coil 1024 was to store the electric energy that direct voltage VDC transmits, and the second electric capacity 1034 is in order to disengage the stored electric energy of the second electric capacity 1034, to drive light-emitting diodes body unit 104.That is when the first switch 206 is opened according to control signal CS, because diode 1032 is for closing, so the electric energy that direct voltage VDC transmits is to be stored in coil 1024, rather than being sent to output voltage VO UT.When the first switch 1026 cut out according to control signal CS, coil 1024 was in order to disengage stored electric energy, to drive simultaneously light-emitting diodes body unit 104 and the second electric capacity 1034 is charged.That is when the first switch 1026 cuts out according to control signal CS, because diode 1032 opens, so coil 1024 can be according to stored electric energy, drive simultaneously light-emitting diodes body unit 104 and the second electric capacity 1034 is charged.In addition, as electric current I D during greater than the electric current predetermined value, control circuit 1030 can produce an overcurrent protection, control signal CS and close this moment, no current is by the first switch, and coil 1024 begins to discharge electric energy, drives light-emitting diodes body unit 104 and reaches 1034 chargings of the second electric capacity; As the first voltage V1 during greater than the voltage predetermined value, control circuit 1030 can produce overvoltage protection, and control signal CS and open this moment, and coil 1024 beginning store electrical energy are to reduce output voltage VO UT.By the carrying out of control signal CS, be beneficial to the protective circuit element when mode of above-mentioned overvoltage protection and overcurrent protection is equal.
In sum, the drive circuit of light-emittingdiode provided by the utility model is to utilize flap or printed circuit board (PCB) to connect several light-emittingdiode lamp bars of light-emitting diodes body unit with series system.Therefore, flowing through the electric current of several light-emittingdiode lamp bars of light-emitting diodes body unit can be identical.In addition, the control circuit in the drive circuit can produce overcurrent protection according to the electric current of first switch of flowing through, and according to the first voltage that bleeder circuit produces, produces overvoltage protection.Therefore, the utlity model has following advantages: the first, because several light-emittingdiode lamp bars are to connect with series system, so the only corresponding second switch of several light-emittingdiode lamp bars causes the cost of drive circuit can be lowered and make simply; The second, because the electric current of several light-emittingdiode lamp bars of the light-emitting diodes body unit of flowing through is identical, so the brightness of each light-emittingdiode in several light-emittingdiode lamp bars is identical; Three, because several light-emittingdiode lamp bars only have corresponding second switch, so the drive circuit of light-emittingdiode is more energy-conservation; Four, because several light-emittingdiode lamp bars only have corresponding second switch, so be easy to the drive circuit of standardization light-emittingdiode.
The above only is the preferred embodiment of the utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model.
Claims (12)
1. the drive circuit of a light-emittingdiode is characterized in that: comprises, and power converter, in order to receiving direct voltage, and this direct voltage that boosts is output voltage, this power converter comprises:
The first electric capacity has first end and the second end, and wherein first end is in order to receive this direct voltage, and the second end in order to hold with being coupled to;
Coil has first end and the second end, and wherein first end is coupled to the first end of this first electric capacity;
The first switch has first end, the second end and the 3rd end, and wherein first end is coupled to the second end of this coil;
Diode has first end and the second end, and this first end is coupled to the second end of this coil, and this second end is in order to export this output voltage; And
Control circuit, have first end, the second end, the 3rd end and the 4th end, wherein first end is coupled to the second end of this first switch, in order to the electric current according to this first switch of flowing through, produce the control signal, to control the open and close of this first switch, this second end is in order to detect this electric current, the 4th end is in order to export a light modulation signal; And
The light-emitting diodes body unit is coupled to the output voltage of this power converter.
2. drive circuit as claimed in claim 1, it is characterized in that: this light-emitting diodes body unit is to be in series by several light-emittingdiode lamp bars.
3. drive circuit as claimed in claim 2, it is characterized in that: several light-emittingdiode lamp bars are to connect with series system by flap or printed circuit board (PCB).
4. drive circuit as claimed in claim 1, it is characterized in that: this power converter comprises in addition, sensing resistor, have first end and the second end, wherein first end is coupled to the 3rd end of this first switch, its second end is coupled to this ground end, and this sensing resistor system is in order to senses flow this electric current through this first switch; And
The second electric capacity has first end and the second end, and wherein first end is coupled to the second end of this diode, and the second end is coupled to this ground end.
5. drive circuit as claimed in claim 1, it is characterized in that: this power converter also comprises rectifier, have first end, the second end, the 3rd end and the 4th end, wherein first end is coupled to the anode of AC power, in order to receive alternating voltage, the second end is coupled to the first end of this first electric capacity, in order to export this direct voltage, the 3rd end is coupled to the negative terminal of this AC power, and the 4th end is coupled to this ground end.
6. drive circuit as claimed in claim 1 is characterized in that: when this first switch was opened according to this control signal, this coil was in order to store electrical energy.
7. drive circuit as claimed in claim 1, it is characterized in that: this control signal is to be the pulse width modulation signal.
8. drive circuit as claimed in claim 1 is characterized in that: when this electric current during greater than the predetermined current value, this control circuit produces overcurrent protection according to this electric current.
9. drive circuit as claimed in claim 1, it is characterized in that: this power converter comprises bleeder circuit in addition, have,
First end is coupled to the second end of this diode;
The second end is in order to export the first voltage to the 3rd end of this control circuit;
The 3rd end is coupled to this ground end;
Wherein when this first voltage during greater than the predeterminated voltage value, this control circuit produces overvoltage protection according to this first voltage, and control signal CS and open this moment.
10. drive circuit as claimed in claim 1, it is characterized in that: this power converter also comprises second switch, and it has,
First end is coupled to the second end of this light-emitting diodes body unit;
The second end is coupled to the 4th end of this control circuit, in order to receive this light modulation signal;
The 3rd end is coupled to this ground end.
11. drive circuit as claimed in claim 1 is characterized in that: when this first switch cut out according to this control signal, this coil was in order to discharge stored electric energy.
12. drive circuit as claimed in claim 1 is characterized in that: this light-emitting diodes body unit is to be straight-down negative light-emitting diodes body unit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101211943U TWM439316U (en) | 2012-06-21 | 2012-06-21 | Light emitting diode driving circuit |
| CN2012203658211U CN202799282U (en) | 2012-06-21 | 2012-07-26 | Drive circuit for luminescence diode |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101211943U TWM439316U (en) | 2012-06-21 | 2012-06-21 | Light emitting diode driving circuit |
| CN2012203658211U CN202799282U (en) | 2012-06-21 | 2012-07-26 | Drive circuit for luminescence diode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202799282U true CN202799282U (en) | 2013-03-13 |
Family
ID=55072223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012203658211U Expired - Fee Related CN202799282U (en) | 2012-06-21 | 2012-07-26 | Drive circuit for luminescence diode |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202799282U (en) |
| TW (1) | TWM439316U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6555612B2 (en) * | 2015-07-03 | 2019-08-07 | パナソニックＩｐマネジメント株式会社 | Light control device |
| TWI625067B (en) * | 2017-05-11 | 2018-05-21 | 李淑媛 | Stable Adjusting Light To LED Lighting Device And Method |
-
2012
- 2012-06-21 TW TW101211943U patent/TWM439316U/en not_active IP Right Cessation
- 2012-07-26 CN CN2012203658211U patent/CN202799282U/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| TWM439316U (en) | 2012-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102869146B (en) | Self-selection holding current circuit | |
| CN202632722U (en) | LED drive circuit | |
| US9775206B2 (en) | LED AC drive circuit | |
| AU2011228994B2 (en) | Modular LED-lighting system | |
| US9220150B2 (en) | Modular LED lighting having an emergency light function | |
| US9693407B2 (en) | LED-lighting system comprising an operational data memory | |
| CN101848577B (en) | LED driving system and driving method | |
| US10143064B2 (en) | Modular LED lighting system having emergency light function | |
| US8981654B2 (en) | LED centralized DC power supply system and operating methods thereof | |
| CN102243854B (en) | LED (light emitting diode) backlight driving method, liquid crystal display device and LED backlight driving circuit | |
| CN102065600A (en) | LED dimming driving system | |
| CN102196643B (en) | Linear constant-current controller, chip and driving device | |
| CN103037589A (en) | Light-emitting diode (LED) constant current drive circuit and liquid crystal display television (LCD TV) | |
| CN201499095U (en) | Power supply capable of reducing power consumption under no-load state | |
| CN103871371A (en) | LED (light-emitting diode) backlight driving circuit, backlight module and liquid crystal display device | |
| CN103124460A (en) | LED driving circuit | |
| CN202799282U (en) | Drive circuit for luminescence diode | |
| CN105307305A (en) | LED power supply control device and TV set | |
| CN201489799U (en) | LED display screen and power supply circuit thereof | |
| CN102665347A (en) | Highly-efficient drive circuit of light emitting diode (LED) Light Bars | |
| CN101064469A (en) | DC-DC power supply converter | |
| CN103826354A (en) | LED constant current source | |
| CN102014558A (en) | LED load detection and power supply control circuit | |
| CN201893106U (en) | Driving control circuit of light emitting diode (LED) back light source | |
| CN110769173B (en) | Television power supply system and television |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20180726 |