CN106028518A - LED linear drive topology - Google Patents
LED linear drive topology Download PDFInfo
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- CN106028518A CN106028518A CN201610421615.0A CN201610421615A CN106028518A CN 106028518 A CN106028518 A CN 106028518A CN 201610421615 A CN201610421615 A CN 201610421615A CN 106028518 A CN106028518 A CN 106028518A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- 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
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- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention mainly relates to an LED linear drive topology, comprising multiple levels of LEDs D1, D2...Dn and multi-level and multiple levels of current adjusting branches DRI1, DRI2...DRIN, which are connected in series, and a level of current adjusting branch DRIK is connected between a cathode terminal and a grounding terminal of any level of LED DK. Any level of current adjusting branch DRIK comprises a transistor QK and a sensing resistor RK, which are connected in series between the cathode terminal and the grounding terminal of the corresponding level of LED DK. A node at which the transistor QK and the sensing resistor RK in each level of current adjusting branch DRIK are interconnected is defined as a detecting node NODEK, and then each level of current adjusting branch DRIK further comprises a first operational amplifier AIK of which an inverting end is coupled to the detecting node NODEK and an output end is coupled to the control end of the transistor QK.
Description
Technical field
The invention mainly relates to lighting electronic equipment, exactly, it is proposed that a kind of LED linear drives topological sum with this
Plant the LED illumination lamp of topology.
Background technology
Along with shortage and the development of new technique of the energy, the running voltage of cold light source LED is low and light efficiency height is considered as illumination
New light sources.But LED illumination device throwing at present has the key issue being generalizable to have two: one to be on the high side
Two is that control circuit instability causes LED life to be substantially reduced.The inefficacy that LED white-light illuminating light fixture occurs at present according to statistics
Fault, about 70% is power issue, and about 20% is circuit and structure problem, is LED single tube only less than 10%
Quality problems own, so the selection of power management scheme also holds the balance for energy-conservation, this just requires to set in driving
Meter selects most suitable AC-DC driver.Therefore the control circuit of low cost is the premise that LED is universal.
Generally LED lamp bead needs that many lamp bead are in series or in parallel could work in use, and employing parallel way is driven
Although dynamic many voltages required for LED are relatively low, but owing to the forward voltage drop of every LED is different so that every LED's
Brightness is different, unless used the mode of individually regulation to ensure that every LED has identical brightness.So parallel way is wanted
Ensure that brightness uniformity is consistent, it is achieved get up more complicated.And use series system to ensure that the electric current flowing through every LED
Identical, the brightness that can make LED is basically identical, and this is the most conventional structure.And when using the type of drive of tandem type
Time, if one or several LED failure and open circuit in the LED of concatenation (short circuit is less negligible on circuit impact)
Circuit generation open circuit will be made and cisco unity malfunction.In order to avoid this defect, can be at each LED two ends reverse parallel connection one
Individual stabilivolt, when certain LED lamp bead generation open circuit, the stabilivolt of its parallel connection throws people's work, it is ensured that series connection lamp bead electricity
Flow constant.It should be noted that the conducting voltage that the voltage stabilizing value of stabilivolt is than LED is high, stabilivolt meeting otherwise in parallel
Shunting is fallen one part of current and is made LED even not work dimmed.
From the electrology characteristic of LED, its mean forward current the most linearly increases along with the increase of forward voltage presents
Long, LED tiny variation of its forward voltage after forward conduction will cause the great changes of LED current, and electric current is to LED
Junction temperature impact is very big, and excessive electric current easilys lead to LED lamp bead junction temperature and raises and damage.Additionally, by the optics of LED
Characteristic understands along with the increase of forward current, and LED light flux increases therewith, i.e. brightness increases.Therefore to keep LED
Luminosity constant is it is necessary to ensure stablizing of LED forward current.Driving power supply the most reasonable in design shines for LED
Bright lamp tool just seems particularly significant.This paper presents a kind of LED linear constant-current drive circuit, this circuit have low cost,
The features such as simple in construction and efficiency is high and volume is little, are well suited for doing the driving power supply of room lighting LED lamp.
Summary of the invention
In one embodiment, the present invention discloses a kind of LED linear and drive topology, including: the multi-stage light emitting two of series connection
Pole pipe D1、D2、……DN, at first first order light emitting diode D1Anode tap provide an input voltage VIN, from
So number N ＞ 1；Multistage electric current regulation branch road DRI1、DRI2、……DRIN, any one level led DKNegative electrode
All connect between end and earth terminal and have electric current regulation branch road DRI described in one-levelK, natural number K meets N >=K >=1；Any one
Level described electric current regulation branch road DRIKAll include being connected on the level led D of corresponding oneKCathode terminal and ground connection
A transistor Q between endKWith a sensing resistance RK；Define electric current regulation branch road DRI described in every one-levelKMiddle crystal
Pipe QKWith sensing resistance RKOne node of interconnection is detection node NODEK, then electric current regulation branch road described in every one-level
DRIKAlso include that end of oppisite phase is coupled to detect node NODEKAnd outfan is coupled to transistor QKControl one of end the
One operational amplifier A 1K；Wherein afterbody electric current regulation branch road DRINThe first operational amplifier A 1NPositive termination
Receive reference voltage VREFAnd end of oppisite phase is coupled to detect node NODEN；Non-final one-level electric current regulation branch road DRINIts
He is any one-level electric current regulation branch road DRIKAlso include: positive terminal receives potentiometer DIVKTo reference voltage VREFCarry out point
Pressure partial pressure value and end of oppisite phase be coupled to rear stage electric current regulation branch road DRIK+1Detection node NODEK+1One second
Operational amplifier A 2K, the second operational amplifier A 2KOutfan be coupled to the first operational amplifier A 1KPositive terminal.
Above-mentioned LED linear drives topology, any electric current regulation branch road DRIKIn this potentiometer DIVKIncluding being connected to
Reference voltage VREFWith a pair divider resistance of earth terminal, described partial pressure value captures at the interconnecting nodes of this pair divider resistance.
Above-mentioned LED linear drives topology, this potentiometer DIVKIn a pair divider resistance resistance value can equal or
It is to differ (such as interconnecting nodes and VREFBetween the resistance value of divider resistance be interconnecting nodes and earth terminal GND it
Between the several times of resistance value of another divider resistance).
Above-mentioned LED linear drives topology, any one-level electric current regulation branch road DRIKThe second operational amplifier A 2K's
The first resistance, the second operational amplifier A 2 it is connected with between outfan and end of oppisite phaseKEnd of oppisite phase be coupled to also by the second resistance
Rear stage electric current regulation branch road DRIK+1Detection node NODEK+1。
Above-mentioned LED linear drives topology, wherein electric current regulation branch road DRIKIn the first resistance and the electricity of the second resistance
Resistance is equal.
Above-mentioned LED linear drives topology, when multi-stage light emitting diode and multistage electric current regulate branch road respective progression N not
During less than 3, regulate branch road DRI at non-final one-level electric currentNBranch road DRI is regulated with non-penultimate stage electric currentN-1Any
Other electric currents regulation branch road DRIKThe second operational amplifier A 2KEnd of oppisite phase and afterbody electric current regulation branch road DRIN
Detection node NODENBetween be also connected with the 3rd resistance.
Above-mentioned LED linear drives topology, electric current regulation branch road DRIKIn the first resistance and the second resistance and the 3rd electricity
The resistance value of resistance is equal.
Above-mentioned LED linear drives topology, sets any one-level electric current regulation branch road DRIKDetection node NODEKPlace
Voltage be VRK；Set afterbody electric current regulation branch road DRI the most in advanceNDetection node NODENThe voltage at place
For VRN；Then penultimate stage electric current regulation branch road DRIN-1The second operational amplifier A 2N-1Output voltage VREF_N-1
Limit: VREF_N-1=VREF-VRN。
Above-mentioned LED linear drives topology, when multi-stage light emitting diode and multistage electric current regulate branch road respective progression N not
During less than 3, regulate branch road DRI at non-final one-level electric currentNBranch road DRI is regulated with non-penultimate stage electric currentN-1Any
Other electric currents regulation branch road DRIKThe second operational amplifier A 2KOutput voltage VREF_KLimit: VREF_K=VREF-
VRN-VRK+1。
In one embodiment, the present invention discloses the lamp device with LED, including the LED described in above-mentioned any one
Linear Driving topology.
In one embodiment, the present invention discloses a kind of driving method driving topology for above-mentioned LED linear, institute
State input voltage VINFor the voltage with alternating-current pulse composition, as multi-stage light emitting diode D1、D2、……DNWith multistage electricity
Stream regulation branch road DRI1、DRI2、……DRINWhen respective total progression N is not less than 3:
In this driving method:
Non-final one-level electric current regulation branch road DRINOther all electric currents regulation branch road DRI1、DRI2……DRIN-1Each
Transistor Q1、Q2……QN-1The original state of acquiescence is set as on-state；Once when the regulation of afterbody electric current
Road DRINIts transistor is logical to come into operation, the most then penultimate stage electric current regulation branch road DRIN-1The second operation amplifier
Device A2N-1Also begin to running；
Need to detect penultimate stage electric current regulation branch road DRIN-1Detection node NODEN-1The voltage VR at placeN-1:
When detecting voltage VRN-1During more than a predetermined threshold value, non-final one-level electric current regulation branch road DRINWith non-inverse
Second level electric current regulation branch road DRIN-1Other electric currents any regulation branch road DRIKTransistor QKTurn off；
When detecting voltage VRN-1Time below this predetermined threshold value, non-final one-level electric current regulation branch road DRINWith non-inverse
Second level electric current regulation branch road DRIN-1Other electric currents any regulation branch road DRIKTransistor QKConnect.
Accompanying drawing explanation
Reading described further below and with reference to after the following drawings, inventive feature and advantage will be apparent to:
Fig. 1 is the ultimate principle that linear LED drives.
Fig. 2 is the topological structure that linear LED drives.
Detailed description of the invention
Seeing Fig. 1, present invention content is based primarily upon the Linear Driving scheme Autonomous test transition of solution illumination LED and cuts
The problem changed, it is possible to realize flowing through the substantially invariable scheme of total current of LED, thereby reduce external component and reduction
Scheme cost, the most also makes the processing of LED light device and maintenance become simple.See multistage LED linear in Fig. 1
The ultimate principle figure of scheme, as a example by two sections of LED, light emitting diode D11And D12Concatenation, light emitting diode D11The moon
A switching device M it is in series with between pole and earth terminal11With resistance RC1And RC2, light emitting diode D12Negative electrode and connect
It is in series with a switching device M between ground end12With resistance RC2, switching device M11And M12Such as by basic field effect
Pipe or bipolar transistor etc. are constituted, and their end that controls is made the switch can be by the driving of driving chip not illustrating out
Switch between turn-on and turn-off or clamped down on to entrance linear zone.According to linear ultimate principle, ACINPUTIt it is conventional exchange
Civil power VACThe voltage with AC ripple components after such as bridge rectifier 10 rectification, ACINPUTIt is loaded into and sends out
Optical diode D11Anode.As the voltage AC with alternating componentINPUTValue drop into ratio time relatively low, the most only open
Close device M11Work (M12Cut-off), light emitting diode D11Luminous (D12Open circuit).Along with alternating component
Voltage ACINPUTValue be stepped up, then cause switching device M11On the pressure drop born constantly raise, the heat that it produces
Also increase, until as switching device M11On after the pressure drop rise born reaches certain value, switching device M12Also begin to
Conducting is operated, so light emitting diode D11And D12All can be luminous.
See Fig. 1, according to identical reason, as voltage ACINPUTDuring decline, and this process is contrary above, Ye Jikai
Close device M12Initiate a switch to off state, light emitting diode D11It is disconnected and no longer luminescence, the most only opens
Close device M11Work and light emitting diode D11Luminous.Thus at voltage ACINPUTRaising and lowering between process work as
In complete a switching cycle, so the whole circuit shown in Fig. 1 just repeats above procedure with the frequency of power frequency twice.
See Fig. 2, first as a example by three sections of LED (note three sections of LED as just example, and actual product is the most not
It is limited to three sections) explain the ultimate principle that a kind of LED linear driving of present invention offer is topological.This topological structure is at least
Multi-stage light emitting diode D including series connection1、D2、D3, the anode of any rear stage diode is connected to adjacent previous stage
The negative electrode of diode, is therefore sequentially connected in series all of diode, and also at first first order light emitting diode D1's
Anode tap provides an input voltage VIN(VINCan be voltage ACINPUT)。
This topological structure the most also includes that multistage electric current regulates branch road DRI1、DRI2、DRI3, any one level led
Cathode terminal and earth terminal between all connect have one-level electric current regulate branch road.Such as first order light emitting diode D1Cathode terminal
With connection has first order electric current to regulate branch road DRI between earth terminal1, second level light emitting diode D2Cathode terminal and earth terminal
Between connect and have second level electric current regulation branch road DRI2, third level light emitting diode D3Cathode terminal and earth terminal between connect
There is second level electric current regulation branch road DRI3。
In this topology, first order electric current regulation branch road DRI1Including being connected on corresponding first order light emitting diode D1
Cathode terminal and earth terminal between a transistor Q1With a sensing resistance R1, second level electric current regulation branch road DRI2
Including being connected on corresponding second level light emitting diode D2Cathode terminal and earth terminal between a transistor Q2With
One sensing resistance R2, and third level electric current regulation branch road DRI3Including being connected on corresponding third level light-emitting diodes
Pipe D3Cathode terminal and earth terminal between a transistor Q3With a sensing resistance R3。
In this topology, definition first order electric current regulation branch road DRI1Middle transistor Q1With sensing resistance R1One of interconnection
Node is detection node NODE1, then this first order electric current regulation branch road DRI1Also include that end of oppisite phase is coupled to this detection node
NODE1And outfan is coupled to transistor Q1First operational amplifier of control end (such as its control gate)
A11.Definition second level electric current regulation branch road DRI2Middle transistor Q2With sensing resistance R2One node of interconnection is detection joint
Point NODE2, then this second level electric current regulation branch road DRI2Also include that end of oppisite phase is coupled to this detection node NODE2And it is defeated
Go out end and be coupled to transistor Q2First operational amplifier A of control end (such as control gate)21.And define the 3rd
Level electric current regulation branch road DRI3In a transistor Q3With a sensing resistance R3One node of interconnection is detection node
NODE3, then third level electric current regulation branch road DRI3Also include that end of oppisite phase is coupled to this detection node NODE3And outfan
It is coupled to transistor Q3First operational amplifier A of control end (such as control gate)31。
Notice that transistor can be MOSFET here, therefore regulate branch road DRI at first order electric current1Middle transistor Q1's
Source terminal and sensing resistance R1The node of interconnection is detection node NODE1, transistor Q1Drain electrode be connected to the first order two
Pole pipe D1Negative electrode.Second level electric current regulation branch road DRI2Middle transistor Q2Source terminal and sensing resistance R2Interconnection
Node is detection node NODE2, transistor Q2Drain electrode be connected to second level diode D2Negative electrode.Third level electric current
Regulation branch road DRI3Middle transistor Q3Source terminal and sensing resistance R3The node of interconnection is detection node NODE3, brilliant
Body pipe Q3Drain electrode be connected to third level diode D3Negative electrode.
In this topology, afterbody electric current regulation branch road DRI3The first operational amplifier A31Positive terminal receive reference
Voltage VREFAnd end of oppisite phase is coupled to detect node NODE3。
In this topology, non-final one-level electric current regulation branch road DRI3Other any one-level electric currents regulation branch road (such as the
One-level and second level electric current regulation branch road DRI2And DRI3) also each include second operational amplifier, such as first
Level electric current regulation branch road DRI1Including second operational amplifier A12, second level electric current regulation branch road DRI2Including one
Second operational amplifier A22。
In this topology, first order electric current regulation branch road DRI1The second operational amplifier A12Positive terminal receive one point
Depressor DIV1(containing resistance R8 and resistance R9) is to reference voltage VREFCarrying out the partial pressure value of dividing potential drop, partial pressure value is equal to resistance
The voltage at node interconnected between R8 and resistance R9.Second operational amplifier A12End of oppisite phase be coupled to the first order electricity
Stream regulation branch road DRI1Rear stage electric current regulation branch road DRI2Detection node NODE2, the second operational amplifier A12
Outfan be coupled to the first order electric current regulation branch road DRI1The first operational amplifier A11Positive terminal.
In this topology, second level electric current regulation branch road DRI2The second operational amplifier A22Positive terminal receive one point
Depressor DIV2(containing resistance R4 and resistance R5) is to reference voltage VREFCarrying out the partial pressure value of dividing potential drop, partial pressure value is equal to resistance
The voltage at node interconnected between R4 and resistance R5.Second operational amplifier A22End of oppisite phase be coupled to the second level electricity
Stream regulation branch road DRI2Rear stage electric current regulation branch road DRI3Detection node NODE3, the second operational amplifier A22
Outfan be coupled to second level electric current regulation branch road DRI2The first operational amplifier A21Positive terminal.
In this topology, afterbody i.e. third level electric current regulation branch road DRI3The first operational amplifier A31Positive terminal
Directly receive reference voltage VREF(not by voltage divider) and its end of oppisite phase are coupled to detect node NODE3.Note
Meaning afterbody electric current regulation branch road DRI3In and be not provided with any one second operational amplifier.
In this topology, first order electric current regulation branch road DRI1The second operational amplifier A12Outfan and end of oppisite phase between
It is connected with the first resistance R10, the second operational amplifier A12End of oppisite phase also by the second resistance R12 be coupled to the first order electricity
Stream regulation branch road DRI1Rear stage electric current regulation branch road DRI2Detection node NODE2。
In this topology, second level electric current regulation branch road DRI2The second operational amplifier A22Outfan and end of oppisite phase between
It is connected with the first resistance R7, the second operational amplifier A22End of oppisite phase be coupled to second level electric current also by the second resistance R6
Regulation branch road DRI2Rear stage electric current regulation branch road DRI3Detection node NODE3。
In this topology, as the LED light emitting diode D of many progression1、D2、D3、……DNRegulate with the electric current of many progression
Branch road DRI1、DRI2、DRI3、……DRINWhen respective total progression N is not less than 3, (we are still with the level of accompanying drawing 2
Number is 3 as example), regulate branch road (such as third level electric current regulation branch road DRI at non-final one-level electric current3) and non-fall
Number second level electric current regulation branch road (such as second level electric current regulation branch road DRI2) other electric currents any regulation branch road in (example
As first order electric current regulates branch road DRI1The second operational amplifier A12End of oppisite phase and afterbody electric current regulation branch road
DRI3Detection node NODE3Between be also connected with the 3rd resistance R11.If progression is not restricted to diagram, still can retouch
State for: as multi-stage light emitting diode D1、D2……DNBranch road DRI is regulated with multistage electric current1、DRI2……DRINEach
Total progression N higher than 3 time, non-final one-level electric current regulate branch road DRINBranch road is regulated with non-penultimate stage electric current
DRIN-1Other electric currents any regulation branch road DRIK(K=1,2 ... (N-2)) the end of oppisite phase of the second operational amplifier
Branch road DRI is regulated with afterbody electric currentNDetection node NODENBetween be also connected with the 3rd resistance, and electric current regulation
Branch road DRIKIn the first resistance and the resistance value of the second resistance and the 3rd resistance equal.
In this topology, if arbitrarily one-level electric current regulation branch road DRIKDetection node NODEKVoltage be VRK；If
Afterbody electric current regulation branch road DRINDetection node NODENThe voltage at place is VRN；Then penultimate stage electric current is adjusted
Joint branch road DRIN-1The second operational amplifier A 2N-1Output voltage VREF_N-1Limit: VREF_N-1=VREF-VRN。
In this topology, when multi-stage light emitting diode and multistage electric current regulation branch road respective progression N are not less than 3,
Non-final one-level electric current regulation branch road DRINBranch road DRI is regulated with non-penultimate stage electric currentN-1Other electric currents any regulation
Branch road DRIKThe second operational amplifier A 2KOutput voltage VREF_KLimit: VREF_K=VREF-VRN-VRK+1。
In order to explain above content, see Fig. 2, still using progression be 3 as example.
Branch road DRI is regulated at first order electric current1In, the electric current flowing through transistor Q1 (such as MOSFET) is controlled in inspection
Survey node NODE1Voltage VR1The upper R1 of ratio, equal to VR1/R1.Branch road DRI is regulated at second level electric current2In, stream
The electric current crossing transistor Q2 is controlled in detection node NODE2Voltage VR2The upper R2 of ratio, equal to VR2/R2.?
Tertiary current regulation branch road DRI3In, and the electric current flowing through transistor Q3 be controlled in detection node NODE3Magnitude of voltage
VR3The upper R3 of ratio, equal to VR3/R3.It it is basic linear drive unit at transistor Q1, Q2, Q3.Work as the second level
Electric current regulation branch road DRI2Middle detection node NODE2Voltage VR2Branch road DRI is regulated with third level electric current3Middle detection joint
Point NODE3Voltage VR3Tend to arriving VREFTime, voltage VR2With voltage VR3The regulation of first order electric current can be fed back to
Branch road DRI1The second operational amplifier A12Branch road DRI is regulated with second level electric current2The second operational amplifier A22。
This feedback regulates branch road DRI to second level electric current2The second operational amplifier A22The impact caused is:
Second operational amplifier A22Short/empty disconnected concept of void according to positive terminal and end of oppisite phase, namely:
(VREF*R5/(R4+R5)-VR3)/R6=(VREF_A2-VREF*R5/(R4+R5))/R7。
So the second operational amplifier A22Its output voltage VREF_A2Meet functional relationship:
VREF_A2=VREF*R5/(R4+R5)+(VREF*R5/(R4+R5)-VR3)*R7/R6……<1>。
This feedback regulates branch road DRI to first order electric current1The second operational amplifier A12The impact caused is:
Second operational amplifier A12Short/empty disconnected concept of void according to positive terminal and end of oppisite phase, according to identical reason, so
Second operational amplifier A12Its output voltage VREF_A1Meet functional relationship:
VREF_A1=VREF*R8/(R8+R9)+(VREF*R8/(R9+R8)-VR2)*R10/R12+VREF*R8/(R8+R9)+(
VREF*R8/(R9+R8)-VR3)*R10/R11……<2>。
If needing to meet and flowing through multi-stage light emitting diode D1、D2、……DNElectric current substantially constant, then need to limit
Two-level current regulation branch road DRI2The second operational amplifier A22Output voltage VREF_A2=VREF-VR3, need to limit
First order electric current regulation branch road DRI1The second operational amplifier A12Output voltage VREF_A1=VREF-VR3-VR2, root
According to V hereREF_A1With VREF_A2Equation and combine formula<1>above and<2>, calculate second level electric current regulation
Road DRI2In R5=R4, R6=R7, calculate the first order electric current regulation branch road DRI1In R10=R11=R12,
And R8=3*R9.When meeting these conditions, AC_INPUTThe diode current substantially constant produced.
If harmonic distortion THD is low, it is only necessary to finely tune multistage electric current regulation branch road DRI1、DRI2、……DRINRespective
Sensing resistance R1、R2、……RNConstant current target can be realized.In the example of three sections of LED of Fig. 2, if harmonic wave loses
As long as true THD is low changes sensing resistance R1、R2And R3Value.
With three sections of LED as example, the present invention can solve transistor Q1 and Q2 and be not added with the bar of other external component
Under part, complete circulation conversion: namely original state acquiescence transistor Q1 and Q2 conducting, detect transistor Q2's
Source terminal voltage namely VR2During more than the threshold value preset, transistor Q1 is turned off, and once when the source electrode of transistor Q2
Terminal voltage namely VR2When being less than or be less than threshold value, transistor Q1 is connect.In transformation process, whole LED strip connects
Diode circuit in electric current be held essentially constant.Because the AC_ of inputINPUTIt is similar steamed bread half-wave, so whole electricity
Road is circulated the most in such a mode.Transistor Q3 can be started in advance, in order at crystalline substance before lighting the LED of concatenation
The node NODE of body pipe Q3 and resistance R3 interconnection3Place can produce suitable voltage, and this voltage can feed back to prime
The second operational amplifier in electric current regulation branch road.
With in the actual application of upper topology, typically lighting electronic device will not be made only with three sections of LED, more
Time many, it are to use quantity considerably beyond the multistage LED lamp bead of 3, therefore understanding three sections of LED that the present invention is explained
On the basis of, it should enforcement means learning multistage LED that can be the clearest and the most definite, and explaining above with respect to three sections of LED
Release part and should not constitute the restrictive condition of multistage LED.
Such as, it is assumed that a kind of LED linear drives in topology and have employed N section LED lamp bead.
Topology includes the multi-stage light emitting diode D of series connection1、D2、……DN, at first first order light emitting diode D1Sun
One input voltage V of extreme offerIN, natural number N ＞ 1, note diode D1It is defined as first first order light emitting diode,
And DNBe defined as the afterbody light emitting diode at end, then the anode tap of any rear stage diode is connected to adjacent with it
The cathode terminal of previous stage diode, thus by light emitting diode D1、D2、……DNAll be connected in series.
Topology includes that multistage electric current regulates branch road DRI1、DRI2、……DRIN, any one level led DKNegative electrode
All connect between end and earth terminal GND and have one-level electric current to regulate branch road DRIK, natural number K meets N >=K >=1, notes
In this application, electric current regulation branch road DRI1It is defined as first first order electric current regulation branch road, and DRINThen it is defined as end
The afterbody electric current regulation branch road of tail.
Arbitrarily one-level electric current regulation branch road DRIKAll include being connected on the level led D of corresponding oneKCathode terminal
And a transistor Q between earth terminal GNDKWith a sensing resistance RK。
Define every one-level electric current regulation branch road DRIKMiddle transistor QKWith sensing resistance RKOne node of interconnection is detection joint
Point NODEK, then every one-level electric current regulation branch road DRIKAlso include that end of oppisite phase is coupled to detect node NODEKAnd outfan
It is coupled to transistor QKControl end first operational amplifier A 1K。
Wherein afterbody electric current regulation branch road DRINThe first operational amplifier A 1NPositive terminal receive reference voltage VREF
And end of oppisite phase is coupled to detect node NODEN。
Non-final one-level electric current regulation branch road DRINOther any one-level electric currents regulation branch road DRIKAlso include one second
Operational amplifier A 2K: the second operational amplifier A 2KPositive terminal receive a potentiometer DIVKTo reference voltage VREF
Carry out the partial pressure value of dividing potential drop, and the second operational amplifier A 2KEnd of oppisite phase be coupled to rear stage electric current regulation branch road DRIK+1
Detection node NODEK+1Place, the second operational amplifier A 2KOutfan be then coupled to electric current regulation branch road DRIKIn
The first operational amplifier A 1KPositive terminal.This also means that afterbody electric current regulates branch road DRINIn be not required to one
Individual second operational amplifier.
Arbitrarily one-level electric current regulation branch road DRIKIn this potentiometer DIVKIncluding: it is connected to reference voltage VREFAnd ground connection
A pair divider resistance between end GND, the second operational amplifier A 2KPositive terminal input partial pressure value capture from this dividing potential drop
Device DIVKIn this pair divider resistance interconnecting nodes at voltage.
Arbitrarily one-level electric current regulation branch road DRIKIn the second operational amplifier A 2KIf (there is the second computing in the middle of it to put
If big device) outfan be connected with the first resistance (R7 in similar Fig. 2), the second operational amplifier A 2 between end of oppisite phaseK
End of oppisite phase be coupled to electric current regulation branch road DRI also by the second resistance (similar R6 in Fig. 2)KRear stage electric current
Regulation branch road DRIK+1Detection node NODEK+1.Electric current regulation branch road DRIKIn the first resistance and the second resistance (class
R6 and R7 like in Fig. 2) resistance value equal.
As multi-stage light emitting diode D1～DNBranch road DRI is regulated with multistage electric current1～DRINRespective total progression N is not less than 3
Time (such as 3 grades of Fig. 2), non-final one-level electric current regulate branch road DRIN(such as DRI3) and non-penultimate stage
Electric current regulation branch road DRIN-1(such as DRI2) other electric currents any regulation branch road DRIK(such as DRI1) second
Operational amplifier A 2KEnd of oppisite phase and afterbody electric current regulation branch road DRIN(such as DRI3) detection node NODEN
Between be also connected with the 3rd resistance (such as R11).Electric current regulation branch road DRIK(such as DRI1The first resistance in) and
The resistance value of two resistance and the 3rd resistance (R10 and R12 in similar Fig. 2 and R11) is equal.
If arbitrarily one-level electric current regulation branch road DRIKDetection node NODEKThe voltage at place is VRKIf, afterbody electricity
Stream regulation branch road DRINDetection node NODENThe voltage at place is VRN, then penultimate stage electric current regulation branch road DRIN-1
The second operational amplifier A 2N-1Output voltage VREF_N-1Limit: VREF_N-1=VREF-VRN.Such as reciprocal in Fig. 2
Second level electric current regulation branch road DRI2The second operational amplifier A22Output voltage VREF_A2=VREF-VR3。
As multi-stage light emitting diode D1～DNBranch road DRI is regulated with multistage electric current1～DRINWhen respective progression N is not less than 3,
Branch road DRI is regulated at non-final one-level electric currentN(such as DRI3) and non-penultimate stage electric current regulation branch road DRIN-1(example
Such as DRI2) any other electric current regulation branch road DRIKThe second operational amplifier A 2KOutput voltage VREF_KLimit
It is set to: VREF_K=VREF-VRN-VRK+1.Such as electric current regulation branch road DRI1The second operational amplifier A12Output
Voltage VREF_A1=VREF-VR3-VR2。
The present invention also provides for the LED linear that a kind of basis sayed above and drives topology (to require multi-stage light emitting diode and multistage
Electric current regulation the respective total progression N of branch road be not less than 3) driving method:
Non-final one-level electric current regulation branch road DRIN(such as DRI3) other all electric currents regulation branch road DRI1、DRI2……
DRIN-1(such as DRI1～DRI2) respective transistor Q1、Q2……QN-1(such as Q1～Q2) the initial shape given tacit consent to
State is set as on-state；
Detecting/detection penultimate stage electric current regulation branch road DRIN-1(such as DRI2) detection node NODEN-1(such as
NODE2) the voltage VR at placeN-1(such as VR2):
STEP1, when detecting voltage VRN-1(such as VR2) more than a predetermined threshold value time, non-final one-level electric current
Regulation branch road DRIN(such as DRI3) and non-penultimate stage electric current regulation branch road DRIN-1(such as DRI2) any
Other electric currents regulation branch road DRIK(such as DRI1) transistor QK(such as Q1) turn off；
STEP2, when when detecting voltage VRN-1(such as VR2) below this predetermined threshold value time, non-final one-level electricity
Stream regulation branch road DRIN(such as DRI3) and non-penultimate stage electric current regulation branch road DRIN-1(such as DRI2) appoint
Anticipate other electric currents regulation branch road DRIK(such as DRI1) transistor QK(such as Q1) connect.
So whole topology/circuit is the most always at STEP1～STEP2～STEP1～STEP2 ... circulate under this pattern.
Above, by explanation and accompanying drawing, giving the exemplary embodiments of the ad hoc structure of detailed description of the invention, foregoing invention carries
Go out existing preferred embodiment, but these contents have been not intended as limitation.For a person skilled in the art, in reading
State bright after, various changes and modifications will be apparent to undoubtedly.Therefore, appending claims should be regarded as and contains this
Bright true intention and whole variations and modifications of scope.In Claims scope, the scope of any and all equivalence is with interior
Hold, be all considered as still belonging to the intent and scope of the invention.
Claims (10)
1. a LED linear drives topology, it is characterised in that including:
The multi-stage light emitting diode D of series connection1、D2、……DN, at first first order light emitting diode D1Anode tap provide
One input voltage VIN, natural number N ＞ 1；
Multistage electric current regulation branch road DRI1、DRI2、……DRIN, any one level led DKCathode terminal and ground connection
All connect between end and have electric current regulation branch road DRI described in one-levelK, natural number K meets N >=K >=1；
Arbitrarily electric current regulation branch road DRI described in one-levelKAll include being connected on the level led D of corresponding oneKThe moon
A transistor Q extremely and between earth terminalKWith a sensing resistance RK；
Define electric current regulation branch road DRI described in every one-levelKMiddle transistor QKWith sensing resistance RKOne node of interconnection is inspection
Survey node NODEK, then electric current regulation branch road DRI described in every one-levelKAlso include that end of oppisite phase is coupled to detect node NODEK
And outfan is coupled to transistor QKControl end first operational amplifier A 1K；
Wherein afterbody electric current regulation branch road DRINThe first operational amplifier A 1NPositive terminal receive reference voltage VREF
And end of oppisite phase is coupled to detect node NODEN；
Non-final one-level electric current regulation branch road DRINOther any one-level electric currents regulation branch road DRIKAlso include: positive terminal
Receive potentiometer DIVKTo reference voltage VREFCarry out the partial pressure value of dividing potential drop and end of oppisite phase is coupled to rear stage electric current regulation branch road
DRIK+1Detection node NODEK+1Second operational amplifier A 2K, the second operational amplifier A 2KOutfan
It is coupled to the first operational amplifier A 1KPositive terminal.
LED linear the most according to claim 1 drives topology, it is characterised in that arbitrarily electric current regulation branch road DRIK
In this potentiometer DIVKIncluding being connected to reference voltage VREFAnd a pair divider resistance between earth terminal, described partial pressure value is picked
Take from the interconnecting nodes of this pair divider resistance.
LED linear the most according to claim 1 drives topology, it is characterised in that arbitrarily one-level electric current regulation
Road DRIKThe second operational amplifier A 2KOutfan and end of oppisite phase between be connected with the first resistance, the second operational amplifier A 2K
End of oppisite phase also by the second resistance be coupled to rear stage electric current regulation branch road DRIK+1Detection node NODEK+1。
LED linear the most according to claim 3 drives topology, it is characterised in that electric current regulation branch road DRIKIn
The first resistance and the resistance value of the second resistance equal.
LED linear the most according to claim 3 drives topology, it is characterised in that when multi-stage light emitting diode and
When multistage electric current regulation branch road respective progression N is not less than 3, regulate branch road DRI at non-final one-level electric currentNWith non-inverse
Second level electric current regulation branch road DRIN-1Other electric currents any regulation branch road DRIKThe second operational amplifier A 2KAnti-phase
End and afterbody electric current regulate branch road DRINDetection node NODENBetween be also connected with the 3rd resistance.
LED linear the most according to claim 5 drives topology, it is characterised in that electric current regulation branch road DRIKIn
The first resistance and the resistance value of the second resistance and the 3rd resistance equal.
LED linear the most according to claim 1 drives topology, it is characterised in that sets any one-level electric current and adjusts
Joint branch road DRIKDetection node NODEKThe voltage at place is VRK；Wherein
Set afterbody electric current regulation branch road DRINDetection node NODENThe voltage at place is VRN；
Then penultimate stage electric current regulation branch road DRIN-1The second operational amplifier A 2N-1Output voltage VREF_N-1Limit:
VREF_N-1=VREF-VRN。
LED linear the most according to claim 7 drives topology, it is characterised in that when multi-stage light emitting diode and
When multistage electric current regulation branch road respective progression N is not less than 3, regulate branch road DRI at non-final one-level electric currentNWith non-inverse
Second level electric current regulation branch road DRIN-1Other electric currents any regulation branch road DRIKThe second operational amplifier A 2KOutput
Voltage VREF_KLimit:
VREF_K=VREF-VRN-VRK+1。
9. the illuminator with LED lamp bead, it is characterised in that include according to any one in claim 1～8
LED linear described in Xiang drives topology.
10. drive a driving method for topology according to the LED linear described in any one in claim 1～8, it is special
Levy and be, described input voltage VINFor the voltage with alternating-current pulse composition, when multi-stage light emitting diode and multistage electric current are adjusted
When the joint respective total progression N of branch road is not less than 3:
Non-final one-level electric current regulation branch road DRINOther all electric currents regulation branch road DRI1、DRI2……DRIN-1Each
Transistor Q1、Q2……QN-1The original state of acquiescence is set as on-state；
Detecting penultimate stage electric current regulation branch road DRIN-1Detection node NODEN-1The voltage VR at placeN-1:
When detecting voltage VRN-1During more than a predetermined threshold value, non-final one-level electric current regulation branch road DRINWith non-inverse
Second level electric current regulation branch road DRIN-1Other electric currents any regulation branch road DRIKTransistor QKTurn off；
When detecting voltage VRN-1Time below this predetermined threshold value, non-final one-level electric current regulation branch road DRINWith non-inverse
Second level electric current regulation branch road DRIN-1Other electric currents any regulation branch road DRIKTransistor QKConnect.
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