CN202796006U - Power supply system used for driving backlight of LED television - Google Patents
Power supply system used for driving backlight of LED television Download PDFInfo
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- CN202796006U CN202796006U CN 201220417719 CN201220417719U CN202796006U CN 202796006 U CN202796006 U CN 202796006U CN 201220417719 CN201220417719 CN 201220417719 CN 201220417719 U CN201220417719 U CN 201220417719U CN 202796006 U CN202796006 U CN 202796006U
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Abstract
The utility model provides a power supply system used for driving backlight of an LED television. The power supply system comprises: a DC power supplying device which is used for receiving an AC voltage and generating a first DC voltage and includes a power factor correction unit and a DC-DC conversion unit, wherein the power factor correction unit is used for receiving the AC voltage and generating a DC high voltage, and the DC-DC conversion unit is used for generating the first DC voltage based on the DC high voltage; a light emitting diode driver which is used for generating a light emitting diode driving voltage based on the first DC voltage and generating a driving current; and a light emitting diode unit which is coupled to the light emitting diode driver and is used for receiving the light emitting diode driving voltage and the driving current, wherein the light emitting diode unit is composed of a plurality of light emitting diode strips connected in series. The power supply system has a simple structure, is energy-saving, and enables brightness of the light emitting diodes to be controlled easily.
Description
Technical field
The utility model relates to a kind of in order to drive the power-supply system of light emitting diode TV backlight, espespecially a kind of a plurality of light-emitting diode light bars that utilize series system connecting luminous diode unit so that the electric current of a plurality of light-emitting diode light bars of the light emitting diode of flowing through identical in order to drive the power-supply system of light emitting diode TV backlight.
Background technology
In the prior art, LCD TV or the backlight module of LCD monitor has a plurality of light-emitting diode light bars usually.Therefore, LCD TV or the backlight module of LCD monitor can according to the open and close of a plurality of light-emitting diode light bars, be controlled the backlight of LCD TV or LCD monitor.Because LCD TV or the backlight module of LCD monitor has a plurality of light-emitting diode light bars, so the driving circuit of light emitting diode must have the corresponding a plurality of switches that are coupled to a plurality of light-emitting diode light bars, to control the open and close of each light-emitting diode light bar.So, prior art will have following shortcoming: the first, because each light-emitting diode light bar has a corresponding switch, so the driving circuit of light emitting diode has expensive and makes consuming time; The second, because each light-emitting diode light bar has a corresponding switch, so may have error between the electric current of a plurality of light-emitting diode light bars of flowing through, cause the backlight wayward of LCD TV or LCD monitor; Three, because each light-emitting diode light bar has a corresponding switch, so the driving circuit of light emitting diode consumes energy.Therefore, for LCD TV or the backlight module of LCD monitor, the driving circuit of the light emitting diode of prior art is not the driving circuit of a good light emitting diode.
Summary of the invention
The purpose of this utility model is to provide that a kind of it is simple in structure in order to drive the power-supply system of light emitting diode TV backlight, is convenient to control.
For achieving the above object, the utility model is a kind of to be comprised in order to the power-supply system that drives the light emitting diode TV backlight: DC power supply, in order to receive alternating voltage, and produce the first DC voltage, wherein this DC power supply comprises: the power factor (PF) amending unit, in order to receiving this alternating voltage, and produce dc high voltage; And direct current in order to according to this dc high voltage, produces this first DC voltage to dc conversion unit; LED drive in order to according to this first DC voltage, produces light emitting diode driving voltage, and produces drive current; And light emitting diode, be coupled to this LED drive, in order to receive this light emitting diode driving voltage and this drive current, wherein this light emitting diode is to be in series by a plurality of light-emitting diode light bars.
Preferably, power-supply system comprises in addition: system board, be coupled to this direct current to dc conversion unit and this LED drive, in order to output control signals to this direct current to dc conversion unit and dim signal to this LED drive.
Wherein, this control signal is to be the pulse width modulation signal.
In addition, this system board comprises in addition: the overcurrent protection unit, be coupled to this LED drive, and in order to according to this drive current, produce overcurrent protection, both when drive current during greater than the predetermined current value, the generation overcurrent protection.
Better, this system board comprises in addition: overvoltage protective unit, be coupled to this LED drive, and in order to according to this light emitting diode driving voltage, produce overvoltage protection, and when driving voltage during greater than the predeterminated voltage value, generation overvoltage protection.
Better, this system board comprises in addition: the over-temperature protection unit, be coupled to this light emitting diode, and in order to the temperature according to this light emitting diode, produce over-temperature protection, both when luminous diode temperature during greater than preset temperature value, the generation over-temperature protection.
Better, the cross-pressure of each light-emitting diode light bar of these a plurality of light-emitting diode light bars is to be higher than 30V.
Better, these a plurality of light-emitting diode light bars are to connect by flap or printed circuit board (PCB) series system.
Better, this dc high voltage is the DC voltage for 400V.
Better, this first DC voltage is the DC voltage for 24V.
Better, this light emitting diode is to be the straight-down negative light emitting diode.
Better, this LED drive comprises: the driving voltage generation unit in order to according to this first DC voltage, produces this light emitting diode driving voltage; And the drive current generation unit, in order to produce this drive current.
Compare with prior art, the utlity model has following advantages: the first, because these a plurality of light-emitting diode light bars are to connect with series system, so the only corresponding drive current generation unit of these a plurality of light-emitting diode light bars causes the cost of this power-supply system can be lowered and make simply; The second, because the electric current of a plurality of light-emitting diode light bars of this light emitting diode of flowing through is identical, so the brightness of each light emitting diode in these a plurality of light-emitting diode light bars is identical; Three, because these a plurality of light-emitting diode light bars only have a corresponding drive current generation unit, so the utility model is more energy-conservation.
Description of drawings
Fig. 1 is a kind of synoptic diagram in order to the power-supply system that drives the light emitting diode TV backlight of the present invention.
[main element symbol description]
100 power-supply systems, 102 DC power supply
104 LED drive, 106 light emitting diodes
108 system boards, 1022 power factor (PF) amending units
1024 direct currents are to dc conversion unit 1042 driving voltage generation units
1044 drive current generation units, 1062 flaps
1082 overcurrent protection unit, 1084 overvoltage protective units
1086 over-temperature protection unit AC alternating voltages
CS control signal DS dim signal
FDV the first DC voltage HDV dc high voltage
ILED drive current IL1-IL5 light-emitting diode light bar
The LDV light emitting diode driving voltage
Embodiment
Please refer to Fig. 1, Fig. 1 is a kind of synoptic diagram in order to the power-supply system 100 that drives the light emitting diode TV backlight of the present invention.Power-supply system 100 comprises DC power supply 102, LED drive 104 and light emitting diode 106, and wherein DC power supply 102 comprises power factor (PF) amending unit 1022 and direct current to dc conversion unit 1024.DC power supply 102 is to receive alternating voltage AC, and produces the first DC voltage FDV; Power factor (PF) amending unit 1022 is to receive alternating voltage AC, and improves harmonic components and the power factor of alternating voltage AC, and to produce dc high voltage HDV, wherein dc high voltage HDV is the DC voltage for 400V; Direct current is in order to according to dc high voltage HDV to dc conversion unit 1024, produces the first DC voltage FDV.LED drive 104 comprises driving voltage generation unit 1042 and drive current generation unit 1044.Driving voltage generation unit 1042 is in order to according to the first DC voltage FDV, produces light emitting diode driving voltage LDV, and drive current generation unit 1044 is to produce drive current ILED, and wherein the first DC voltage FDV is the DC voltage for 24V.Light emitting diode 106 is to be coupled to LED drive 104, in order to receive light emitting diode driving voltage LDV.In addition, light emitting diode 106 is to be in series by a plurality of light-emitting diode light bars (for example 5 light-emitting diode light bar IL1-IL5), so the electric current of 5 the light-emitting diode light bar IL1-IL5 that flow through is to equal drive current ILED.So, the brightness meeting of each light emitting diode among 5 light-emitting diode light bar IL1-IL5 is identical.But the utility model is not limited to light emitting diode 106 comprises 5 light-emitting diode light bar IL1-IL5.In addition, light emitting diode 106 is to can be the straight-down negative light emitting diode, that is light emitting diode 106 is the belows that are arranged at a liquid crystal panel, and light emitting diode 106 is emission of lights up.But it is to can be the straight-down negative light emitting diode that the utility model is not limited to light emitting diode 106, that is light emitting diode 106 also can be the side emitting diode.In addition, the cross-pressure of each light-emitting diode light bar of 5 light-emitting diode light bar IL1-IL5 is to be higher than 30V, and 5 light-emitting diode light bar IL1-IL5 see through a flap 1062 to connect with series system.In another embodiment of the present utility model, 5 light-emitting diode light bar IL1-IL5 see through printed circuit board (PCB) to connect with series system.
As shown in Figure 1, power-supply system 100 comprises system board 108 in addition.System board 108 is to be coupled to direct current to dc conversion unit 1024 and LED drive 104, in order to export control signal CS to direct current to dc conversion unit 1024 and dim signal DS to LED drive 104, wherein control signal CS is the pulse width modulation signal.Therefore, system board 108 can produce the first DC voltage FDV to dc conversion unit 1024 by control signal CS control direct current.In addition, because dim signal DS can be pulse width modulation signal, noble potential signal or electronegative potential signal, so the drive current generation unit 1044 in the LED drive 104 can be according to dim signal DS, the brightness of control light emitting diode 106, that is drive current generation unit 1044 can be according to dim signal DS, the flow through drive current ILED of light emitting diode 106 of adjustment is with the brightness of control light emitting diode 106.
In addition, as shown in Figure 1, system board 108 comprises overcurrent protection unit 1082, overvoltage protective unit 1084 and over-temperature protection unit 1086 in addition.Overcurrent protection unit 1082 is to be coupled to LED drive 104, in order to according to flowing through the drive current ILED of drive current generation unit 1044, produces overcurrent protection, both when drive current during greater than the predetermined current value, and the generation overcurrent protection.Overvoltage protective unit 1084 is to be coupled to LED drive 104, in order to according to light emitting diode driving voltage LDV, produces overvoltage protection, both when driving voltage during greater than the predeterminated voltage value, and the generation overvoltage protection.Over-temperature protection unit 1086 is to be coupled to light emitting diode 106, in order to the temperature according to light emitting diode 106, produces over-temperature protection.
In sum, provided by the utility model is to utilize flap or printed circuit board (PCB) with a plurality of light-emitting diode light bars of series system connecting luminous diode unit in order to the power-supply system that drives the light emitting diode TV backlight.Therefore, flowing through the electric current of a plurality of light-emitting diode light bars of light emitting diode can be identical.In addition, the system board in the power-supply system can produce overcurrent protection according to the drive current of the drive current generation unit of flowing through, and according to light emitting diode driving voltage, produces overvoltage protection, and according to the temperature of light emitting diode, produces over-temperature protection.Therefore, the utlity model has following advantages: the first, because a plurality of light-emitting diode light bars are to connect with series system, so the only corresponding drive current generation unit of a plurality of light-emitting diode light bars causes the cost of power-supply system can be lowered and make simply; The second, because the electric current of a plurality of light-emitting diode light bars of the light emitting diode of flowing through is identical, so the brightness of each light emitting diode in a plurality of light-emitting diode light bar is identical; Three, because a plurality of light-emitting diode light bars only have a corresponding drive current generation unit, so the utility model is more energy-conservation.
The above only is preferred embodiment of the present 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. one kind in order to drive the power-supply system of light emitting diode TV backlight, it is characterized in that: comprise:
DC power supply in order to receiving alternating voltage, and produces the first DC voltage, and wherein this DC power supply comprises:
The power factor (PF) amending unit in order to receiving this alternating voltage, and produces dc high voltage; And
Direct current in order to according to this dc high voltage, produces this first DC voltage to dc conversion unit;
LED drive in order to according to this first DC voltage, produces light emitting diode driving voltage, and produces drive current; And
Light emitting diode is coupled to this LED drive, and in order to receive this light emitting diode driving voltage and this drive current, wherein this light emitting diode is to be in series by a plurality of light-emitting diode light bars.
2. power-supply system as claimed in claim 1, it is characterized in that: other comprises: system board, be coupled to this direct current to dc conversion unit and this LED drive, in order to output control signals to this direct current to dc conversion unit and dim signal to this LED drive.
3. power-supply system as claimed in claim 2, it is characterized in that: this control signal is to be the pulse width modulation signal.
4. power-supply system as claimed in claim 2, it is characterized in that: this system board comprises in addition: the overcurrent protection unit is coupled to this LED drive; in order to according to this drive current; produce overcurrent protection, both when drive current during greater than the predetermined current value, the generation overcurrent protection.
5. power-supply system as claimed in claim 2; it is characterized in that: this system board comprises in addition: overvoltage protective unit; be coupled to this LED drive; in order to according to this light emitting diode driving voltage; produce overvoltage protection; and when driving voltage during greater than the predeterminated voltage value, produce overvoltage protection.
6. power-supply system as claimed in claim 2; it is characterized in that: this system board comprises in addition: the over-temperature protection unit; be coupled to this light emitting diode; in order to the temperature according to this light emitting diode; produce over-temperature protection; both when luminous diode temperature during greater than preset temperature value, produced over-temperature protection.
7. power-supply system as claimed in claim 1, it is characterized in that: the cross-pressure of each light-emitting diode light bar of these a plurality of light-emitting diode light bars is to be higher than 30V.
8. power-supply system as claimed in claim 1 is characterized in that: these a plurality of light-emitting diode light bars are to connect by flap or printed circuit board (PCB) series system.
9. power-supply system as claimed in claim 1, it is characterized in that: this dc high voltage is the DC voltage for 400V.
10. power-supply system as claimed in claim 1, it is characterized in that: this first DC voltage is the DC voltage for 24V.
11. power-supply system as claimed in claim 1 is characterized in that: this light emitting diode is to be the straight-down negative light emitting diode.
12. power-supply system as claimed in claim 1 is characterized in that: this LED drive comprises:
The driving voltage generation unit in order to according to this first DC voltage, produces this light emitting diode driving voltage; And
The drive current generation unit is in order to produce this drive current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220417719 CN202796006U (en) | 2012-08-22 | 2012-08-22 | Power supply system used for driving backlight of LED television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220417719 CN202796006U (en) | 2012-08-22 | 2012-08-22 | Power supply system used for driving backlight of LED television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202796006U true CN202796006U (en) | 2013-03-13 |
Family
ID=47823219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220417719 Expired - Fee Related CN202796006U (en) | 2012-08-22 | 2012-08-22 | Power supply system used for driving backlight of LED television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202796006U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106163027A (en) * | 2015-03-26 | 2016-11-23 | 苏州璨宇光学有限公司 | Light source drive device and light source driving method |
-
2012
- 2012-08-22 CN CN 201220417719 patent/CN202796006U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106163027A (en) * | 2015-03-26 | 2016-11-23 | 苏州璨宇光学有限公司 | Light source drive device and light source driving method |
| CN106163027B (en) * | 2015-03-26 | 2018-12-04 | 苏州璨宇光学有限公司 | Light source drive device and light source driving method |
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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 |
Granted publication date: 20130313 Termination date: 20160822 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |