CN104936335A - Driving method of light emitting diode chip - Google Patents
Driving method of light emitting diode chip Download PDFInfo
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- CN104936335A CN104936335A CN201410106483.3A CN201410106483A CN104936335A CN 104936335 A CN104936335 A CN 104936335A CN 201410106483 A CN201410106483 A CN 201410106483A CN 104936335 A CN104936335 A CN 104936335A
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- emitting diode
- diode chip
- light
- backlight unit
- reference voltage
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Abstract
A driving method of a light emitting diode chip comprises the following steps of generating a reference voltage and controlling a driving unit according to the reference voltage so that the driving unit outputs electric energy corresponding to reference voltage power; obtaining a working current needed by the light emitting diode chip; making the driving unit output the working current to the light emitting diode chip under power corresponding to the reference voltage. Through using the reference voltage of different magnitudes of voltage, the driving unit outputs the electric energy of different power to the light emitting diode chip so that a purpose of integrating various kinds of driving devices into one device is reached.
Description
Technical field
The present invention drives relevant with light-emitting diode chip for backlight unit, refers to a kind of driving method of light-emitting diode chip for backlight unit especially.
Background technology
Press, light emitting diode illuminating apparatus includes a light-emitting diode chip for backlight unit and a drive unit, and this drive unit is in order to provide the electric energy needed for this light-emitting diode chip for backlight unit.Current light-emitting diode chip for backlight unit specification is on the market a feast for the eyes, for the light-emitting diode chip for backlight unit with equal-wattage, the voltage of its rated specification and the combination variety of electric current various, take power as the light-emitting diode chip for backlight unit of 28W be example, namely the combination of its rated voltage and rated current has the combinations such as 80V/350mA, 56V/500mA, 40V/700mA.In addition, the voltage of the light-emitting diode chip for backlight unit of various different capacity specification and the combination of electric current too numerous to enumerate especially.
In order to the light-emitting diode chip for backlight unit driving multiple set of specifications like this to close, current mode develops a kind of drive unit for each light-emitting diode chip for backlight unit.But, for light emitting diode illuminating apparatus manufacturer, all need to manufacture a kind of drive unit to the light-emitting diode chip for backlight unit of each electric current and voltage combination under each power, so not only increase the pressure of drive unit stock, and cannot to measure valency processed, cause manufacturing cost to remain high, relatively make the price of light emitting diode illuminating apparatus decline, this is also one of the reason that still cannot popularize of current light emitting diode illuminating apparatus.Be used for multiple power and the light-emitting diode chip for backlight unit driving method of multiple voltage and currents combination if can develop, when reducing the pressure of light-emitting diode chip for backlight unit drive unit stock, and effectively reduce manufacturing cost.
Summary of the invention
The object of the present invention is to provide a kind of driving method of light-emitting diode chip for backlight unit, be applicable to the light-emitting diode chip for backlight unit driving multiple power and multiple voltage and currents combination.
For achieving the above object, the driving method of light-emitting diode chip for backlight unit provided by the invention, be applied to the device including a driver element, this driver element is electrically connected a light-emitting diode chip for backlight unit, and wherein a kind of electric energy that this driver element can export in plural number kind power controllably gives this light-emitting diode chip for backlight unit; This driving method comprises the following step:
A, produce a reference voltage, and control this driver element according to the size of this reference voltage and export should the electric energy of reference voltage power to make this driver element;
B, obtain an operating current needed for this light-emitting diode chip for backlight unit;
C, control this driver element and under power corresponding to this reference voltage, export this operating current give this light-emitting diode chip for backlight unit.
Effect of the present invention is the reference voltage utilizing different magnitude of voltage, this driver element can be made to export the electric energy of different capacity and give light-emitting diode chip for backlight unit, reaches object multiple drive being integrated into.The known drive unit of effective improvement can only be suitable for the inconvenience of the light-emitting diode chip for backlight unit of single kind of specification.
Accompanying drawing explanation
Fig. 1 is the drive unit calcspar that a preferred embodiment of the present invention is applied.
Fig. 2 is that one of the resistor voltage divider circuit of above-mentioned preferred embodiment drive unit implements aspect.
Fig. 3 is the driving method flow chart of above-mentioned preferred embodiment light-emitting diode chip for backlight unit.
Fig. 4 is the drive unit calcspar that another preferred embodiment of the present invention is applied.
Symbol description in accompanying drawing:
1 drive unit, 10 driver elements, 102 current output circuits, 12 detecting voltage unit, 14 current sense unit, 16 bleeder circuits, 18 diverter switches, 182 stitch, 184 jumper, 20 arithmetic elements, 22 control units, P power supply, L light-emitting diode chip for backlight unit, V voltage source, Vref reference voltage, R1 ~ R5 resistance.
Embodiment
For can the present invention be illustrated more clearly in, lift preferred embodiment and coordinate accompanying drawing to be described in detail as follows, refer to shown in Fig. 1, for the drive unit 1 that a preferred embodiment of the present invention light-emitting diode chip for backlight unit driving method is applied, include driver element 10, detecting voltage unit 12, current sense unit 14, bleeder circuit 16, a plurality of diverter switch 18, arithmetic element 20 and a control unit 22.
This driver element 10 is electrically connected an a power supply P and light-emitting diode chip for backlight unit L, and this driver element 10 receives the electric energy of this power supply P and exports after the operating voltage be converted to needed for this light-emitting diode chip for backlight unit L and an operating current.Have plural number in this driver element 10 and plant different power, it can export the wherein a kind of electric energy in those power controllably, and under each predetermined power, can change the size of this operating current and the size of this operating voltage controllably.Actually, this driver element can be to adopt based on the circuit of the pattern such as PWM, semibridge system, Buck, Boost and designs.
This detecting voltage unit is electrically connected this driver element 10, exports the operating voltage of giving this light-emitting diode chip for backlight unit L in order to detect this driver element 10.This current sense unit 14 is electrically connected this driver element 10, exports in order to detect this driver element 10 operating current giving this light-emitting diode chip for backlight unit L.
This bleeder circuit 16 is a resistor voltage divider circuit in the present embodiment, is electrically connected those diverter switches 18, and those diverter switches 18 are electrically connected to a voltage source V.In the present embodiment, respectively this diverter switch 18 comprises two stitch (Pin) 182 and a jumper (Jumper) 184, this two stitch 182 is electrically connected this voltage source V and this bleeder circuit 16 respectively, this jumper 184 connects this two stitch 182 removably, makes respectively this diverter switch 18 be open circuit or short-circuit condition.This bleeder circuit 16 produces a reference voltage Vref after this voltage source V is carried out dividing potential drop.Please coordinate shown in Fig. 2, the bleeder circuit 16 of the present embodiment comprises the resistance R1 ~ R4 of an a plurality of parallel connection and resistance R5 and connects with resistance R1 ~ R4, wherein, resistance R1 ~ R4 is connected to this voltage source V by those diverter switches 18, resistance R4 is connected directly to this voltage source, resistance R1 ~ R4 by resistance R5 ground connection, namely forms this reference voltage with the dividing potential drop of this resistance R5 jointly.
The open and close state composition defining those diverter switches 18 forms plurality of combinations aspect, and the quantity n of those diverter switches 18, the combination aspect quantity formed is 2
nindividual.For example, three constructible combination aspects of diverter switch 18 are individual (2
3).The combination aspect of three diverter switch formations coordinates the resistance R1 ~ R4 of different resistance values, and resistance R1 ~ R4 can be made to form the equivalent resistance of kind of different resistance values.It is wherein a kind of in eight kinds of resistance values that the jumper 184 changing those diverter switches 18 and corresponding stitch 182 combine or be separated the equivalent resistance that this bleeder circuit 16 can be made to be formed, in other words, the reference voltage that the exportable eight kinds of magnitudes of voltage of this bleeder circuit 16 are wherein a kind of.In fact, this reference voltage also can adopt other circuit to produce, such as with variable resistor by this voltage source V dividing potential drop or the reference voltage exporting different magnitude of voltage with microprocessor.
This arithmetic element 20 is electrically connected this detecting voltage unit 12, this current sense unit 14 and this bleeder circuit 16, and this arithmetic element 20 is electrically connected this driver element 10 by this control unit 22.This arithmetic element 20 exports corresponding electric signal according to the size of this reference voltage by this control unit 22 and controls this driver element 10, to make this driver element 10 export should the electric energy of reference voltage power, the electric energy power proportional that this driver element 10 exports be in this reference voltage.For example, the exportable power of this driver element 10 is one of them electric energy of 28W ~ 21W, and the power that maximum reference voltage correspondence exports is 28W, and the power that secondary large reference voltage correspondence exports is 27W, by that analogy.In addition, this arithmetic element 20 also carries out computing according to the voltage measured by this detecting voltage unit 12 and current sense unit 14 and electric current, and control this driver element 10 by this control unit 22, make this driver element 10 under the power corresponding to this reference voltage Vref, export operating current needed for this light-emitting diode chip for backlight unit L.
Thus, utilize aforementioned drive unit 1 can carry out the driving method of light-emitting diode chip for backlight unit L of the present invention, this driving method includes the step shown in Fig. 3:
First, the open and close aspect that user sets those diverter switches 18 according to the power requirements of connected light-emitting diode chip for backlight unit L is 2
ncombination aspect in one, this driver element 10 is exported and meets the power of this light-emitting diode chip for backlight unit L specification.For example, the exportable power of this driver element 10 is one of them electric energy of 28W ~ 21W, and the power requirements of the light-emitting diode chip for backlight unit L connected is when being 28W, three jumper 184 are all connected corresponding stitch 182 by user, now, resistance R1 ~ R4 because of parallel connection therefore, its equivalent resistance is minimum, this voltage source V is made to divide the voltage being pressed on resistance R5 maximum, and produce maximum reference voltage and export to this arithmetic element 20, and then to make this arithmetic element 20 control this driver element 10 power output by this control unit 22 be the electric energy of 28W.
Then, this arithmetic element 20 controls by this control unit 22 electric current that this driver element makes this driver element 10 export to give this light-emitting diode chip for backlight unit L to be increased gradually by a less electric current, and this arithmetic element 20 calculates the voltage of this detecting voltage unit 12 and the detecting of this current sense unit 14 and the product (i.e. power) of electric current simultaneously.Can be appreciated that easily, the operating voltage exporting this light-emitting diode chip for backlight unit L to is the lifting of the operating current exported along with this driver element 10 and increases, therefore, the power put on this light-emitting diode chip for backlight unit L also increases thereupon, until the power put on this light-emitting diode chip for backlight unit L reaches stopping increasing electric current during power (28W) of reference voltage, electric current is hereat this light-emitting diode chip for backlight unit L and operates in should operating current needed for the power of reference voltage.
Then, this arithmetic element 20 controls this driver element 10 by this control unit 22 constantly, makes output give the operating current of this light-emitting diode chip for backlight unit L and operating voltage and maintains power corresponding to this reference voltage.
In use, when connecting the light-emitting diode chip for backlight unit L of 27W if change into, then again the jumper 184 of correspondence is separated, this reference voltage is declined one-level again, this driver element 10 can be controlled in the same way again, make it export the electric energy of 27W.Similarly, after all jumper 184 being separated, the equivalent resistance that resistance R1 ~ R4 is formed is maximum, makes the dividing potential drop of resistance R5 minimum, and the reference voltage exported is minimum, the electric energy of corresponding 21W.Use jumper 184 and stitch 182 effectively can reduce cost of parts as diverter switch 18 in the present embodiment.
In one embodiment, refer to Fig. 4, this driver element 10 comprises a plurality of current output circuit 102, and respectively this current output circuit 102 exports the electric current of a predetermined current range, and the predetermined current range of those current output circuits 102 is different, such as 300 ~ 500mA and 500 ~ 700mA.This arithmetic element 20 controls this driver element 10 by this control unit 22, makes this driver element 10 under the power corresponding to this reference voltage, export this operating current according to required operating current with the current output circuit 102 of correspondence and gives this light-emitting diode chip for backlight unit L.For example, required operating current is 600mA, then this driver element 10 exports this operating current with the current output circuit 102 that current range is 500 ~ 700mA.So, the current range that this driver element 10 exports can be expanded, increase the light-emitting diode chip for backlight unit be suitable for.In sum, user, by changing the combination aspect of those diverter switches, can produce the reference voltage of different magnitude of voltage, and then controls the electric energy that this driver element exports different capacity.Thus, what make this drive unit form exportable different capacity determines power driving device, reaches object multiple drive being integrated into, effectively improves the inconvenience that known drive unit can only be suitable for the light-emitting diode chip for backlight unit of single kind of specification.
The foregoing is only the better possible embodiments of the present invention, the equivalence that application specification of the present invention and claim are done such as changes, and ought to be included in the scope of the claims of the present invention.
Claims (8)
1. the driving method of a light-emitting diode chip for backlight unit, be applied to the device including a driver element, this driver element is electrically connected a light-emitting diode chip for backlight unit, and wherein a kind of electric energy that this driver element can export in plural number kind power controllably gives this light-emitting diode chip for backlight unit; This driving method comprises the following step:
A, produce a reference voltage, and control this driver element according to the size of this reference voltage and export should the electric energy of reference voltage power to make this driver element;
B, obtain an operating current needed for this light-emitting diode chip for backlight unit;
C, control this driver element and under the power corresponding to this reference voltage, export this operating current give this light-emitting diode chip for backlight unit.
2. the driving method of light-emitting diode chip for backlight unit according to claim 1, wherein, this driver element comprises a plurality of current output circuit, respectively this current output circuit exports the electric current of a predetermined current range, and the predetermined current range of those current output circuits is different, step C controls this driver element to make it under power corresponding to this reference voltage, export this operating current with the current output circuit of correspondence to give this light-emitting diode chip for backlight unit.
3. the driving method of light-emitting diode chip for backlight unit according to claim 1, wherein, the electric energy power proportional that in steps A, this driver element exports is in this reference voltage.
4. the driving method of light-emitting diode chip for backlight unit according to claim 1, wherein, steps A produces this reference voltage after a voltage source is carried out dividing potential drop by a bleeder circuit.
5. the driving method of light-emitting diode chip for backlight unit according to claim 4, wherein, this bleeder circuit is electrically connected a plurality of diverter switch, is that the open and close state switching those diverter switches makes this bleeder circuit produce this reference voltage specific in steps A.
6. the driving method of light-emitting diode chip for backlight unit according to claim 4, wherein, this bleeder circuit comprises a resistor voltage divider circuit, is to switch the open and close state of those diverter switches to make this resistor voltage divider circuit form specific equivalent resistance with to this voltage source dividing potential drop in steps A.
7. the driving method of light-emitting diode chip for backlight unit according to claim 6, wherein, the quantity of those diverter switches is n, and the combination of the open and close state of those diverter switches forms 2
nplanting combination aspect, is that the open and close aspect of those diverter switches of switching is 2 in steps A
ncombination aspect in one, the equivalent resistance that this resistor voltage divider circuit is formed is 2
nplant the wherein one in resistance value.
8. the driving method of light-emitting diode chip for backlight unit according to claim 7, wherein, respectively this diverter switch comprises two stitch and a jumper, this two stitch is electrically connected this voltage source and this resistor voltage divider circuit respectively, this jumper connects this two stitch removably, is to change respectively this jumper connect or separate this corresponding two stitch to form wherein this combination aspect in steps A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410106483.3A CN104936335A (en) | 2014-03-20 | 2014-03-20 | Driving method of light emitting diode chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410106483.3A CN104936335A (en) | 2014-03-20 | 2014-03-20 | Driving method of light emitting diode chip |
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| CN104936335A true CN104936335A (en) | 2015-09-23 |
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| CN201410106483.3A Pending CN104936335A (en) | 2014-03-20 | 2014-03-20 | Driving method of light emitting diode chip |
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Citations (5)
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| TW201106792A (en) * | 2009-05-08 | 2011-02-16 | Samsung Electronics Co Ltd | Driving integrated circuit and image display device including the same |
| JP2012079965A (en) * | 2010-10-04 | 2012-04-19 | Fdk Corp | Power unit for led drive |
| TWM461277U (en) * | 2013-03-27 | 2013-09-01 | Hep Tech Co Ltd | Multiple-specification mixing-use LED chip driving device |
| CN203219563U (en) * | 2013-03-28 | 2013-09-25 | 东林科技股份有限公司 | Drive device for light emitting diode chips in multiple specifications |
| TWI423732B (en) * | 2009-11-03 | 2014-01-11 | Cal Comp Electronics & Comm Co | Lighting apparatus, driving circuit of light emitting diode and driving method using the same |
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2014
- 2014-03-20 CN CN201410106483.3A patent/CN104936335A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201106792A (en) * | 2009-05-08 | 2011-02-16 | Samsung Electronics Co Ltd | Driving integrated circuit and image display device including the same |
| TWI423732B (en) * | 2009-11-03 | 2014-01-11 | Cal Comp Electronics & Comm Co | Lighting apparatus, driving circuit of light emitting diode and driving method using the same |
| JP2012079965A (en) * | 2010-10-04 | 2012-04-19 | Fdk Corp | Power unit for led drive |
| TWM461277U (en) * | 2013-03-27 | 2013-09-01 | Hep Tech Co Ltd | Multiple-specification mixing-use LED chip driving device |
| CN203219563U (en) * | 2013-03-28 | 2013-09-25 | 东林科技股份有限公司 | Drive device for light emitting diode chips in multiple specifications |
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Application publication date: 20150923 |