CN105873308A - Light emitting element driving circuit and light emitting element circuit driving method - Google Patents
Light emitting element driving circuit and light emitting element circuit driving method Download PDFInfo
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- CN105873308A CN105873308A CN201510029224.XA CN201510029224A CN105873308A CN 105873308 A CN105873308 A CN 105873308A CN 201510029224 A CN201510029224 A CN 201510029224A CN 105873308 A CN105873308 A CN 105873308A
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Abstract
The invention provides a light emitting element driving circuit and a light emitting element circuit driving method. The light emitting element driving circuit is used for driving the light emitting element circuit provided with multiple serial light emitting elements. The light emitting element driving circuit decides the driven light emitting element according to rectifier input voltage. The light emitting element driving circuit comprises a switch module, a current source circuit and a total harmonic distortion (THD) compensation circuit, wherein the THD compensation circuit generates an adjusting signal according to the rectifier input voltage; and the current source circuit provides light emitting element current for a conducted light emitting element according to the adjusting signal to reduce total harmonic distortion. Under rectifier input voltage with a different amplitude, the current peak value or the maximum value of the light emitting element current in a period remains to be a fixed value.
Description
Technical field
The present invention relates to the driving method of a kind of light emitting element driving circuit and light-emitting element circuit,
Particularly relate to one and have what total harmonic distortion (total harmonic distortion, THD) compensated
Light emitting element driving circuit and the driving method of light-emitting element circuit.
Background technology
Figure 1A shows a kind of prior art light emitting diode (light emitting diode, LED)
Drive circuit 10 and the schematic diagram of interlock circuit thereof.As shown in Figure 1A, LED drive circuit 10
Comprise on-off circuit 11, ON-OFF control circuit 12 and fixed current source 13.LED drive circuit
10 in order to drive LED circuit 20, and wherein LED circuit 20 comprises the LED of multiple series connection,
As shown in Figure 1A, the LED of these multiple series connection, be divided into LED group G1, G2, G3 and
G4.On-off circuit 11 comprises switch S1, S2, S3 and S4 tetra-switch.Such as Figure 1A institute
Showing, switch S1-S4 is electrically connected position suitable in LED circuit 20, to control LED
Group G1-G4.Alternating current power supply 40 produces alternating voltage, and rectification circuit 30 is to this alternating voltage
Carry out rectification, and produce rectified input voltage Vin as shown in Figure 1B.And LED drive circuit
10 basic modes driving LED circuit 20, are the level according to rectified input voltage Vin,
Turn on or be not turned on the most different switch S 1-S4, and making the LED group in LED circuit 20
Group G1-G4, wherein one or more LED groups are luminous.
For example, as in Figure 1B, signal oscillogram is illustrated, as rectified input voltage Vin1
Level less than level L1 time, switch S1-S4 be all not turned on, LED group G1-G4 is neither
Luminous；When the level of rectified input voltage Vin is between level L1 and L2, switch S1 leads
Logical, switch S2-S4 is not turned on, and LED group G1 is luminous；When rectified input voltage Vin1's
Level is between level L2 and L3, and switch S2 turns on, and switch S1, S3-S4 are not turned on,
LED group G1-G2 is luminous；When the level of rectified input voltage Vin is between level L3 and L4
Between, switch S3 conducting, switch S1-S2 with S4 is not turned on, and LED group G1-G3 sends out
Light；When the level of rectified input voltage Vin exceedes level L4, switch S4 conducting, switch S1-S3
Being not turned on, LED group G1-G4 is luminous.Relevant LED drive circuit 10 is defeated according to rectification
Enter the type of drive of voltage Vin, refer to the 7th, 081, No. 722 case of United States Patent (USP) case special with the U.S.
Profit No. 2011/0273102 case of application case.
Wherein, under conditions of the peak level of rectified input voltage Vin1 is fixing, fixed current
Source 13 provides the electric current of fixed size, so that one or more LED in LED group G1-G4
During group's luminescence, the electric current flowing through LED therein is definite value.Such as the news of electric current I1 in Figure 1B
Number waveform is illustrated, no matter in LED group G1-G4 during one or more LED group luminescence,
The electric current flowed through is all fixing, and the only level at rectified input voltage Vin is less than level L1
Time, in the case of namely switch S1-S4 is all not turned on, electric current I1 is zero current.
For the drive circuit with direct voltage drive LED circuit, prior art LED
The advantage of drive circuit 10 is to need not rectified input voltage Vin is converted to DC voltage,
The cost of manufacture can be saved；And when the enough height of the frequency of rectified input voltage Vin, naked eyes are also seen
Do not go out the flicker of LED circuit 20.And prior art LED drive circuit 10 disadvantageously,
Its total harmonic distortion (total harmonic distortion, THD) is higher.Additionally, when rectification inputs
During the peak level difference of voltage, as shown in Figure 1B, rectified input voltage Vin1's Yu Vin2
Peak level is different, and electric current I1 from I2 flowing through the LED of conducting can be caused different.
In view of this, the present invention, i.e. for above-mentioned the deficiencies in the prior art, proposes one and has THD
The light emitting element driving circuit compensated and the driving method of light-emitting element circuit, and flow through conducting
Light-emitting component electric current not different because rectified input voltage is different.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art and defect, propose one and have
The light emitting element driving circuit of THD compensation and the driving method of light-emitting element circuit, and flow through
The light-emitting component electric current of conducting is not different because rectified input voltage is different.
For reaching above-mentioned purpose, one of them viewpoint is sayed, the invention provides a kind of light-emitting component
Drive circuit, in order to drive a light-emitting element circuit, wherein this light-emitting element circuit has multiple
The light-emitting component of series connection, to receive a rectified input voltage, this light emitting element driving circuit comprises:
One switch module, including multiple switches and an ON-OFF control circuit, the most the plurality of switch is respectively
Couple with this corresponding light-emitting component, and this ON-OFF control circuit couples with the plurality of switch, use
According to this rectified input voltage, to determine the light-emitting component of conducting；One current source circuit, with this
Switch module couples, in order to adjust signal according to one, it is provided that a light-emitting component electric current gives conducting
Light-emitting component, the wherein maximum tool of at least part of time in a cycle of this light-emitting component electric current maximum
Have close to the waveform profiles of this rectified input voltage and have substantially identical with this rectified input voltage
Phase angle, and, the current peak of this light-emitting component electric current or maximum is not defeated because of this rectification
Enter the amplitude difference of voltage and significantly change；And a total harmonic distortion (total harmonic
Distortion, THD) compensate circuit, including: an adaptability multiplier circuit, in order to according to being somebody's turn to do
Rectified input voltage, and produce an input voltage weighted sampling signal, the weighting of this input voltage takes
The value of sample signal is relevant to the peak value of this rectified input voltage；And a THD control circuit, with
This adaptability multiplier circuit couples, and in order to according to this input voltage weighted sampling signal, produces
This adjustment signal, to determine this light-emitting component electric current.
Wherein in a kind of preferred embodiment, when the amplitude difference of this rectified input voltage,
Current peak or the maximum of this light-emitting component electric current are maintained fixed value.
Wherein in a kind of preferred embodiment, this THD compensates circuit and also includes a current settings
Circuit, couples with this THD control circuit, in order to provide current settings news, and this THD
Control circuit also couples with this current setting circuit, according to this input voltage weighted sampling signal and
This current settings signal, produces this adjustment signal.
Wherein in a kind of preferred embodiment, this adjustment signal has with this rectified input voltage
A substantially identical phase angle.
Wherein in a kind of preferred embodiment, this adaptability multiplier circuit makes this input voltage
There is between weighted sampling signal and this rectified input voltage the relation of direct ratio, and the ratio of this direct ratio
Coefficient is relevant to the peak value of this rectified input voltage.
Wherein in a kind of preferred embodiment, when the amplitude of this rectified input voltage is relatively large
Time, this coefficient is relatively low；When the amplitude of this rectified input voltage is relatively small, this coefficient
Of a relatively high, adjusted input voltage weighted sampling signal adaptively by this so that in difference
Under this rectified input voltage of amplitude, all obtain substantially identical or close input voltage weighting and take
Sample signal.
Wherein in a kind of preferred embodiment, this adaptability multiplier circuit includes: an input
Voltage sensing circuit, in order to sense this rectified input voltage, and produces an input voltage dividing potential drop；
One peak value sensing circuit, couples with this input voltage sense circuit, in order to sense this input voltage
The peak value of dividing potential drop, produces a peak value sensing signal；One multiplexer circuit, senses with this peak value
Circuit couples, and in order to sense signal according to this peak value, produces a regulation coefficient；And a multiplication
Device, couples with this multiplexer circuit, in order to according to this input voltage dividing potential drop and this regulation coefficient,
Produce this input voltage weighted sampling signal.Wherein in a kind of preferred embodiment, this adaptation
Property multiplier circuit includes: an input voltage sense circuit, in order to receive this rectified input voltage,
And according to a feedback signal, and produce this input voltage weighted sampling signal；One comparison circuit,
Couple with this input voltage sense circuit, in order to compare this input voltage weighted sampling signal and one
Reference signal, produces a comparative result signal；And a counting circuit, with this comparison circuit coupling
Connect, in order to according to this comparative result signal, to produce this feedback signal.
Wherein in a kind of preferred embodiment, this adaptability multiplier circuit also includes a clamper
Circuit, in order to preset level according to one, and limits the one of this input voltage weighted sampling signal
Big value.
Wherein in a kind of preferred embodiment, send out corresponding with of this adaptability multiplier circuit
The backward end of optical element connects and is not directly connected to this rectified input voltage, in receiving one
Portion's voltage.
For reaching above-mentioned purpose, another viewpoint is sayed, the invention provides a kind of light-emitting component electricity
The driving method on road, wherein this light-emitting element circuit has the light-emitting component of multiple series connection, this
The driving method of optical element circuit comprises: provide a rectified input voltage；Input according to this rectification
Voltage, to determine the light-emitting component of conducting；According to this rectified input voltage, and produce an input
Voltage weighted sampling signal, the value of this input voltage weighted sampling signal is relevant to this rectification input
The peak value of voltage；According to this input voltage weighted sampling signal, produce an adjustment signal；And
According to this adjustment signal, it is provided that a light-emitting component electric current gives the light-emitting component of conducting, in a cycle
In at least partly the time have close to the waveform profiles of this rectified input voltage and input with this rectification
Voltage has substantially identical phase angle, and, the current peak of this light-emitting component electric current or pole
Big value does not significantly change because the amplitude of this rectified input voltage is different.
Below by specific embodiment elaborate, when being easier to understand the purpose of the present invention, skill
Art content, feature and the effect reached thereof.
Accompanying drawing explanation
Figure 1A shows a kind of prior art light emitting diode (light emitting diode, LED)
Drive circuit 10 and the schematic diagram of interlock circuit thereof；
Figure 1B shows the signal waveform of prior art LED drive circuit 10 and interlock circuit thereof
Schematic diagram；
First embodiment of Fig. 2 A Yu 2B display present invention；
Fig. 3 shows second embodiment of the present invention；
Fig. 4 shows the 3rd embodiment of the present invention；
Fig. 5 shows the 4th embodiment of the present invention；
Fig. 6 shows the 5th embodiment of the present invention；
Fig. 7 shows the 6th embodiment of the present invention；
Fig. 8 A-8C illustrates embodiment and the operation mechanism of clamp circuit 1316；
Fig. 9 A shows an alternative embodiment of the invention；
Fig. 9 B shows compareing of Fig. 9 A embodiment and front several embodiments；
Figure 10 A-10E gives a few examples how display current source circuit 120 carries according to adjustment electric current Id
For light-emitting component electric current ILED.
Symbol description in figure
10 LED drive circuits
11 on-off circuits
12 ON-OFF control circuit
13,120a fixed current source
20 LED circuits
21 light-emitting element circuits
30 rectification circuits
40 alternating current power supplys
100,200 light emitting element driving circuits
110 switch modules
120 current source circuits
130 THD compensate circuit
131 adaptability multiplier circuits
133 THD control circuits
135 current setting circuits
1311 input voltage sense circuits
1312 comparison circuits
1313 peak value sensing circuits
1314 counting circuits
1315 multiplexer circuit
1316 clamp circuits
1317 multipliers
1324 up/down number control circuits
1326 enumerators
1411,1421 latch circuits
Number control circuit on 1413
1423 times number control circuits
G1-G4 LED group
A1-A3 error amplifier
CR, CRU, CRD comparative result signal
Digital communication number under DC
Id adjusts electric current
ILED, ILED1, ILED2 light-emitting component electric current
ISET current settings signal
I1, I2 electric current
K1-Kn coefficient
LH, LHU, LHD breech lock signal
L1-L4 level
Q1-Q6 transistor
Ra-Rb, R1, R3, R4 resistance
R2 variable resistance
S1-S4 switchs
T0-t3 time point
The upper digital communication number of UC
UD up/down digital communication number
Vin, Vin1, Vin2 rectified input voltage
Vint builtin voltage
Vp1, Vp2 peak level (peak value)
Vref, Vref1, Vref2 reference signal
Detailed description of the invention
Refer to Fig. 2 A and 2B, first embodiment of the display present invention.As shown in Figure 2 A,
Light emitting element driving circuit 100 is in order to driven for emitting lights element circuitry, and it has sending out of multiple series connection
Optical element.Wherein, light-emitting element circuit is for example and without limitation to aforesaid LED circuit 20, example
Such as, but not limited to, comprise the LED of multiple series connection, and the LED of these multiple series connection is divided into multiple LED
Group, such as but not limited to such as LED circuit 20, is divided into G1, G2, G3 and G4 tetra-
LED group.As shown in Figure 2 A.It should be noted that, light-emitting element circuit is not limited to LED
Circuit 20, only comprises single LED strip, and light-emitting element circuit can also by multiple LED strip also
The light-emitting device array that the LED array that formed of connection or other light-emitting component connection in series-parallel are formed
Deng.Rectification circuit 30 produces rectified input voltage Vin, with the difference of application scenario, and this rectification
The amplitude of input voltage vin may be different or unstable because powering, even and if should identical
By occasion, the amplitude of rectified input voltage Vin is likely to change；Refering to Fig. 2 B, rectification inputs
Voltage Vin may be defeated compared with the rectified input voltage Vin1 of short arc or the rectification of higher amplitudes
Enter voltage Vin2.Light-emitting element circuit receives rectified input voltage Vin, and light-emitting component drives
Circuit 100 changes powered in light-emitting element circuit according to rectified input voltage Vin
Optical element.
Please continue to refer to Fig. 2 A, light emitting element driving circuit 100 comprises switch module 110, electricity
Current source circuit 120 and total harmonic distortion (total harmonic distortion, THD) compensate
Circuit 130.Wherein, switch module 110 includes, but not limited to, e.g. switch as shown in Figure 1A
Circuit 111 and ON-OFF control circuit 112.Wherein, on-off circuit 111 comprises multiple switch (example
As comprised S1, S2, S3 and S4 tetra-switch, as shown in Figure 1A), respectively with corresponding
LED group G1, G2, G3 electrically connect with G4.ON-OFF control circuit 112 is defeated according to rectification
Entering voltage Vin, determine in multiple LED, powered LED, to turn on the LED of these correspondences
And it is luminous.For example, and prior art LED drive circuit 10 same mechanism, such as when whole
When the level of stream input voltage vin (Vin1 or Vin2) is less than level L1, switch S1-S4 is neither
Conducting, G1-G4 is the most luminous in LED group；As rectified input voltage Vin (Vin1 or Vin2)
Level between level L1 and L2, switch S1 conducting, switch S2-S4 be not turned on, LED
Group G1 is luminous；When the level of rectified input voltage Vin (Vin1 or Vin2) is between level L2
And between L3, switch S2 conducting, switch S1, S3-S4 and be not turned on, LED group G1-G2
Luminous；When rectified input voltage Vin (Vin1 or Vin2) level between level L3 and L4 it
Between, switch S3 conducting, switch S1-S2 with S4 is not turned on, and LED group G1-G3 is luminous；
When the level of rectified input voltage Vin (Vin1 or Vin2) exceedes level L4, and switch S4 turns on,
Switch S1-S3 is not turned on, and LED group G1-G4 is luminous.
Unlike prior art LED drive circuit 10, in the present embodiment, current source
Circuit 120, in addition to coupling with switch module 110, separately compensates circuit 130 with THD and couples,
With according to adjusting signal, it is provided that light-emitting component electric current ILED gives the light-emitting component of conducting.THD
Compensate circuit 130 to couple with current source circuit 120, in order to according to rectified input voltage Vin (Vin1
Or Vin2), produce and adjust signal.Adjustment signal, in order to adjust light-emitting component electric current ILED, makes
Its at least part of time (during the conducting of arbitrary LED group) in a cycle has close to rectification
The waveform profiles (for example, close to the waveform profiles of semifocal chord ripple) of input voltage vin also inputs with rectification
Voltage Vin has substantially identical phase angle, and, the current peak of light-emitting component electric current ILED
Value (extreme currents in i.e. one cycle) does not significantly change because the amplitude of rectified input voltage is different,
That is, more than various amplitude rectified input voltage Vin1 Yu Vin2 (peak level Vp1 and
Vp2 is different) situation under, the current peak of light-emitting component electric current ILED maintains one and presets
In the range of and preferably fixed value.So-called " current peak ", may be not only in single time point
Reach this maximum (refering to the ILED waveform of Fig. 2 B), also may maintain within a persistent period
This maximum (refering to the ILED waveform of Fig. 8 B, be detailed later).That is, the feature of the present invention
It is: light-emitting component electric current ILED is at least part of time and rectified input voltage Vin in a cycle
There is a substantially identical phase angle, therefore reduce THD, and light-emitting component electric current ILED
Current peak significantly do not change, therefore different because the amplitude of rectified input voltage is different
Application scenario, light-emitting component electric current ILED is the most identical or close, and is not easy to flash
(flicker) phenomenon.
In a kind of preferred embodiment, adjust the signal waveform of signal such as but not limited to such as figure
2B is illustrated；Adjust signal to be semifocal chord ripple and have substantially identical with rectified input voltage Vin
Phase angle.It should be noted that, what is called has substantially identical phase angle and is not offered as necessary absolute
The most just there is identical phase angle, and should be regarded as tolerable and have deviation a little, only
Will be compared to the light-emitting component electric current of fixed value (such as prior art current I1's Yu I2 in Figure 1B
Signal waveform is illustrated), apply the present invention, make rectified input voltage Vin and light-emitting component electric current
ILED has the phase angle being closer to comparatively speaking, and can reduce THD.In this enforcement
In example, when rectified input voltage Vin (Vin1 or Vin2) exceedes level L1, light-emitting component electricity
Stream ILED and rectified input voltage Vin (Vin1 or Vin2) has substantially identical phase angle.
In the present embodiment, THD compensate circuit 130 include adaptability multiplier circuit 131,
THD control circuit 133 and current setting circuit 135.Adaptability multiplier circuit 131 in order to
According to rectified input voltage Vin (Vin1 or Vin2), and produce input voltage weighted sampling signal,
Its sampling value is relevant to the peak value of rectified input voltage Vin.THD control circuit 133 and adaptation
Property multiplier circuit 131 couples, in order to according to input voltage weighted sampling signal and current settings
Signal ISET, produces and adjusts signal.Current setting circuit 135 and THD control circuit 133
Couple, in order to provide current settings signal ISET.In another embodiment, THD compensates circuit
130 can only include adaptability multiplier circuit 131 and THD control circuit 133, and omit
Current setting circuit 135 (therefore illustrates current setting circuit 135 and current settings with dotted line in figure
Signal ISET).
Fig. 3 shows second embodiment of the invention, the present embodiment citing display adaptability multiplier
A kind of embodiment of circuit 131.In the present embodiment, adaptability multiplier circuit 131 wraps
Include input voltage sense circuit 1311, peak value sensing circuit 1313, multiplexer circuit 1315,
With multiplier 1317.Input voltage sense circuit 1311 in order to sensing rectified input voltage Vin and
Produce the signal relevant to rectified input voltage Vin, wherein, be somebody's turn to do " with rectified input voltage Vin
Relevant signal " (" input voltage divides to be for example and without limitation to the dividing potential drop of rectified input voltage Vin
Pressure ").Peak value sensing circuit 1313 couples with input voltage sense circuit 1311, in order to sense
The peak value of input voltage dividing potential drop and produce peak value sensing signal.Because input voltage dividing potential drop is defeated with rectification
Enter voltage Vin to be correlated with, therefore peak value sensing signal also with the peak value phase of rectified input voltage Vin
Close.Multiplexer circuit 1315 couples with peak value sensing circuit 1313, in order to according to peak value sense
Survey signal, produce regulation coefficient.As it can be seen, multiplexer circuit 1315 is such as according to peak value
Sensing signal, in the way of such as tabling look-up, selects coefficient suitable in COEFFICIENT K 1-Kn, as
Regulation coefficient.Multiplier 1317 couples with multiplexer circuit 1315, in order to according to input electricity
Pressure dividing potential drop and regulation coefficient, produce input voltage weighted sampling signal.The present embodiment signal one
Having out the adaptability multiplier circuit 131 of circuit controls pattern, it is according to input voltage dividing potential drop,
It is multiplied by a coefficient, makes such as to have between input voltage weighted sampling signal and rectified input voltage
The relation of direct ratio, and this coefficient is relevant to the peak value of rectified input voltage Vin, therefore inputs electricity
The value of pressure weighted sampling signal is also relating to the peak value of rectified input voltage Vin.
Certainly, according to the present invention, multiplexer circuit 1315 is not limited to the mechanism decision tabled look-up
Regulation coefficient, can also utilize other mechanism, such as, repair with metal fuse (metal fuse)
(trim) mode determines regulation coefficient.Peak value sensing circuit 1313 is also not limited to sense input voltage and divides
The peak value of pressure, can also sense the slope etc. into voltage, and produce peak value sensing signal.
In a word, the second embodiment signal: to open circuit controls pattern, input voltage dividing potential drop is multiplied by
Individual coefficient is as input voltage weighted sampling signal, and this coefficient is relevant to rectified input voltage Vin
Peak value.The embodiment of its reality has various change, is not limited to the mode of diagram.When whole
When flowing amplitude relatively large (therefore peak value is higher) of input voltage vin, this coefficient is relatively low；
When the amplitude of rectified input voltage Vin relatively small (therefore peak value is relatively low), this coefficient is relatively
Height, adjusts to being consequently adapted to property input voltage weighted sampling signal so that no matter rectification input is electric
Pressure Vin is Vin1 or Vin2, all obtains substantially identical or close input voltage weighted sampling news
Number.(depending on the adjustable range of coefficient, if Vin1x is K1=Vin2x K2, then do not examining
In the case of considering component error, rectified input voltage Vin1 or Vin2 can be made all to obtain reality
The input voltage weighted sampling signal that matter is identical, in the case, no matter rectified input voltage is
Vin1 or Vin2, the current peak of light-emitting component electric current ILED or maximum can be maintained fixing
Value；If but available coefficient value can not make Vin1x K1=Vin2x K2 just, then be only capable of
To close input voltage weighted sampling signal, in the case, if rectified input voltage is at Vin1
And change between Vin2, current peak or the maximum of light-emitting component electric current ILED can maintain
Without notable change in one scope preset.)
THD control circuit 133 is according to input voltage weighted sampling signal and current settings signal
ISET or according to input voltage weighted sampling signal without current settings signal ISET,
Producing and adjust signal, this adjusts signal in order to control current source circuit 120 to provide light-emitting component
Electric current ILED.About the details of THD control circuit 133, refer to same applicant institute Shen
TW patent application case please the 103120122nd (Chinese patent application case
No. 201410275924.2) Fig. 5 A-10C, it can have many variations, be specified in the most one by one
This.In short, because just such as having between input voltage weighted sampling signal and rectified input voltage
The relation of ratio, as long as therefore THD control circuit 133 is come according to input voltage weighted sampling signal
Produce the waveform (can be homophase or anti-phase) with corresponding profile, it is possible to as adjusting signal,
This adjustment signal can be current signal or voltage signal.And current setting circuit 135 is produced
Current settings signal ISET can determine a current reference value, such as adjust signal in order to determining
Lower limit or the upper limit etc., thus set lower limit or the upper limit etc. of light-emitting component electric current ILED.
How current source circuit 120 provides light-emitting component electric current ILED according to adjustment signal, has
Various ways, the invention is not limited in any of which.Adjust signal such as but not limited to
Including the form of a kind of electric current, i.e. as shown in Figure 10 A-10E, to adjust electric current Id as adjustment
Signal.Illustrating, refer to Figure 10 A-10B, current source circuit 120 can be an electricity
(current replication circuit has various forms to stream duplicate circuit, the invention is not limited in any of which
A kind of), and light-emitting component electric current ILED such as equal to or be proportional to adjust electric current Id and (work as switch
During any switch conduction in S1-S4, lower with), depending on this current replication circuit duplication ratio and
Fixed.The another embodiment of Figure 10 C display current source circuit 120, adjusts in the present embodiment
Whole electric current Id is multiplied by the resistance value of resistance Ra and is multiplied by resistance Rb equal to light-emitting component electric current ILED
Resistance value, therefore according to the setting of resistance Ra and Rb, light-emitting component electric current ILED equally may be used
To be equal to or to be proportional to adjust electric current Id.Figure 10 D-10E display light-emitting component electric current ILED is also
Can be to adjust electric current Id to deduct or plus a fixed current.10D figure shows the former, electric current
Such as but not limited to comprising a fixed current source 120a in source circuit 120, and light-emitting component electric current
ILED deducts, by adjusting signal Id, the fixed current that this fixed current source 120a is determined；Figure 10 E
Display the latter, comprises fixed current source 120a in current source circuit 120, and light-emitting component electric current
ILED is by adjusting the fixed current that electric current Id is determined plus this fixed current source 120a.
The embodiment of figure 10 above A-10E is not limited to be used alone, can also two or more groups
Close application.
Fig. 4 shows the 3rd embodiment of the present invention, the present embodiment citing display adaptability multiplication
The another embodiment of device circuit 131.In the present embodiment, adaptability multiplier circuit 131
Including input voltage sense circuit 1311, comparison circuit 1312 and counting circuit 1314.Input
Voltage sensing circuit 1311 is in order to sense rectified input voltage Vin, and according to feedback signal, and
Produce input voltage weighted sampling signal.Comparison circuit 1312 and input voltage sense circuit 1311
Couple, in order to compare input voltage weighted sampling signal and reference signal (not shown, can be single
Or multiple reference signal, illustrate after appearance), produce comparative result signal.Counting circuit 1314 with than
Relatively circuit couples, and in order to according to comparative result signal, produces feedback signal.With second enforcement
Unlike example, the adaptability multiplication of the present embodiment a kind of control model with loop circuit of signal
Device circuit 131, according to input voltage weighted sampling signal, feedbacks and controls input voltage sense circuit,
With the relation between accommodation input voltage weighted sampling signal and rectified input voltage Vin,
Make to keep the most at any time the relation of such as direct ratio, and the value of input voltage weighted sampling signal is correlated with
In the amplitude that rectified input voltage is Vin or peak value.
Fig. 5 shows the 4th embodiment of the present invention.The present embodiment display adaptability multiplier electricity
131 1 kinds of road more specific embodiment.As it can be seen, in the present embodiment, adaptability multiplication
Device circuit 131 includes input voltage sense circuit 1311, comparison circuit 1312 and counting circuit
1314.Input voltage sense circuit 1311 such as has the resistance R1 and variable resistance R2 of series connection,
And the resistance value of variable resistance R2 is adjusted by feedback signal.Input voltage weighted sampling signal is such as
Take from the dividing potential drop on variable resistance R2.Comparison circuit 1312 such as has error amplifier A1,
Relatively (in this embodiment, input voltage weighted sampling signal is input voltage weighted sampling signal
Dividing potential drop on variable resistance R2) and reference signal Vref, produce comparative result signal CR.Counting
Circuit 1314 includes latch circuit 1322, up/down number control circuit 1324 and enumerator 1326.
Latch circuit 1322, according to comparative result signal CR, determines breech lock signal LH.Up/down numerical control system
Circuit 1324, according to breech lock signal LH, determines up/down digital communication UD.Enumerator 1326 basis
Up/down digital communication UD, performs the operation of up/down number, to produce feedback signal, variable in order to adjust
The resistance value of resistance R2.Consequently, it is possible to regardless of the amplitude of rectified input voltage Vin, profit
By the loop circuit control mechanism of the present embodiment, input voltage weighted sampling signal capable of feedback control,
Make it not affected by the amplitude of rectified input voltage Vin, such as, make input voltage weighted sampling interrogate
Number peak level fix, and then make light-emitting component electric current ILED not because of rectified input voltage Vin
Amplitude different and change.
Fig. 6 shows the 5th embodiment of the present invention.The present embodiment display adaptability multiplier electricity
The another kind of more specific embodiment in road 131.As it can be seen, in the present embodiment, adaptability is taken advantage of
Adder circuit 131 includes input voltage sense circuit 1311, comparison circuit 1312 and counting electricity
Road 1314.Input voltage sense circuit 1311 such as has resistance R1 and the variable resistance of series connection
R2, and the resistance value of variable resistance R2 adjusts by feedback signal.Input voltage weighted sampling signal
Such as take from the dividing potential drop on variable resistance R2.Comparison circuit 1312 such as has error amplifier
A2 and A3, is respectively compared input voltage weighted sampling signal (in this embodiment, input voltage
Weighted sampling signal is the dividing potential drop on variable resistance R2) and reference signal Vref1/Vref2, and divide
Chan Sheng comparative result signal CRU and CRD.Counting circuit 1314 includes latch circuit 1411
With 1421, upper several control circuits 1413, lower several control circuits 1423 and enumerator 1431.
Latch circuit 1411 and 1421, respectively according to comparative result signal CRU and CRD, determines breech lock
Signal LHU and LHD.Upper several control circuit 1413, according to breech lock signal LHU, decision counts
Signal UC.Lower several control circuit 1423, according to breech lock signal LHD, determines lower digital communication DC.
Enumerator 1431, according to upper digital communication UC and lower digital communication DC, performs the operation of up/down number, with
Produce feedback signal, in order to adjust the resistance value of variable resistance R2.Consequently, it is possible to no matter rectification
The amplitude of input voltage vin how, utilizes the loop circuit control mechanism of the present embodiment, capable of feedback
Control input voltage weighted sampling signal so that it is do not affected by the amplitude of rectified input voltage Vin,
The peak level such as making input voltage weighted sampling signal is fixed, and then makes light-emitting component electric current
ILED does not changes because the amplitude of rectified input voltage Vin is different.
Fig. 7 shows the 6th embodiment of the present invention.As it is shown in fig. 7, light-emitting component drives electricity
Road 100 is in order to driven for emitting lights element circuitry 21, and it has the light-emitting component of multiple series connection.Wherein,
Light-emitting element circuit 21 is for example and without limitation to aforesaid LED circuit 20.Light-emitting component drives
Circuit 100 comprises switch module 110, current source circuit 120 and THD compensates circuit 130.
Wherein, THD compensation circuit 130 includes adaptability multiplier circuit 131, THD control circuit
133 and current setting circuit 135.Wherein, adaptability multiplier circuit 131 includes input electricity
Pressure sensitivity slowdown monitoring circuit 1311, comparison circuit 1312, counting circuit 1314 and clamp circuit 1316.
Adaptability multiplier circuit 131 is in order to according to rectified input voltage Vin, and produces input voltage and add
Power sample signal.Further, the clamp circuit 1316 in adaptability multiplier circuit 131 is to input
Voltage weighted sampling signal in addition clamper processes, and produces clamper input voltage weighted sampling signal.
Clamp circuit 1316 couples with input voltage sense circuit 1311, in order to according to presetting level (not
Illustrate, in rear detailed description), and limit the maximum of input voltage weighted sampling signal.THD controls
Circuit 133 couples, in order to basis with the clamp circuit 1316 in adaptability multiplier circuit 131
Clamper input voltage weighted sampling signal and current settings signal ISET, produce and adjust signal.Electricity
Stream initialization circuit 135 couples with THD control circuit 133, in order to provide current settings signal
ISET.Maximum should be noted that, the current setting circuit 135 in the present embodiment and current settings
Signal ISET equally omits.
The present embodiment is intended to explanation, and adaptability multiplier circuit 131 may also include clamp circuit
1316, utilize the way of input voltage weighted sampling signal clamper, make input voltage weighting take
The level that sample signal is not higher than preset.It is relevant to input voltage weighted sampling news owing to adjusting signal
Number, and light-emitting component electric current ILED is relevant to adjust signal, therefore limits input voltage weighting
After the maximum of sample signal, just can limit the maximum current of light-emitting component electric current ILED accordingly
Value, or under identical maximum, change waveform and the integration of light-emitting component electric current ILED
Value.As for the adjustment of THD Yu the current value of light-emitting component electric current ILED, visual user
Demand, adjusts the default level of clamp circuit 1316 and reaches.
Fig. 8 A-8C illustrates embodiment and the operation mechanism of clamp circuit 1316.At Fig. 8 A
In, clamp circuit 1316 is such as but not limited to comprising a multiplexer, in order to choose input voltage
Weighted sampling signal and junior in default level are as clamp voltage weighted sampling signal.Wherein
Signal waveform anticipate as shown in Figure 8 B.In the present embodiment, rectified input voltage Vin is as shown in the figure
For semifocal chord ripple, the dividing potential drop of input voltage weighted sampling signal for example, rectified input voltage Vin,
Thus be also semifocal chord ripple as depicted, and clamper input voltage weighted sampling signal is in input electricity
It is when pressure weighted sampling signal is not less than default level, identical with input voltage weighted sampling signal,
When input voltage weighted sampling signal exceedes default level, then maintain default level and such as scheme institute
Show.Therefore, it can the current value of part light-emitting component electric current ILED is fixed on maximum, from
For a kind of application angle, the maximum current value of light-emitting component electric current ILED can be limited, or
For another kind application angle, under identical maximum, because changing light-emitting component
The waveform of electric current ILED, makes integrated value increase, and therefore can improve light-emitting component electric current ILED
Overall current value.Clamp circuit 1316 is not limited to reach with multiplexer, such as at Fig. 8 C
In shown embodiment, clamp circuit 1316 can be a buffer circuit, its operation received
Upper voltage limit is this default level, so, when the input voltage weighted sampling that input is received
When signal exceedes default level, the outfan of clamp circuit 1316 can only export this default level,
This is also a kind of embodiment of clamp circuit 1316.
Fig. 9 A shows an alternative embodiment of the invention；Fig. 9 B shows that Fig. 9 A embodiment is with front
The comparison of several embodiments.Light emitting element driving circuit 200 shown in Fig. 9 A embodiment is with former
Individual embodiment (such as Fig. 2 A embodiment) difference is, in the present embodiment, and light-emitting component
Drive circuit 200 does not directly receive rectified input voltage Vin.With the light-emitting component shown in Fig. 2 A
Drive circuit 100 is compared, the present embodiment light emitting element driving circuit the most as shown in Figure 2 A
100, directly receive rectified input voltage Vin, but receive the electricity of LED group G1 backward end
Pressure.Please referring next to Fig. 9 B, compare light emitting element driving circuit 100 and drive electricity with light-emitting component
Road 200 related signal waveform, wherein represents the light-emitting component electric current ILED of Fig. 2 A with ILED1,
And the light-emitting component electric current ILED of Fig. 9 A is represented with ILED2.As shown in Figure 9 B, luminous unit
THD in part drive circuit 100 compensates circuit 130 and receives rectified input voltage Vin, has been
Whole semifocal chord ripple, starts from the initial point (time point t0) in cycle, continues the whole cycle (to time point
T3), and light-emitting component electric current ILED1 produced by light emitting element driving circuit 100, such as figure institute
Showing and can postpone a period of time, be just not zero after time point t1 electric current, corresponding to rectification input electricity
Pressure Vin is higher than the time point of level L1.This is because rectified input voltage Vin is higher than level
After L1, LED circuit 20 just can turn on (refering to Fig. 2 A-2B).On the other hand, Fig. 9 A is real
Executing in example, the THD in light emitting element driving circuit 200 compensates circuit 130 and receives builtin voltage
Vint, is the semifocal chord ripple from time point t1 to time point t2, and light emitting element driving circuit 200
Produced light-emitting component electric current ILED2, the most also has similar waveform profiles.Figure
Voltage and current waveform profiles in 9A embodiment is increasingly similar, therefore compared to other reality aforementioned
Executing example, Fig. 9 A embodiment has more preferably THD and improves.Additionally, compared to first enforcement
The light emitting element driving circuit 100 of example, the light emitting element driving circuit 200 of Fig. 9 A embodiment can
Save a pin.
More than having been for preferred embodiment so that the present invention to be described, simply the above, only make this
Skilled person is apparent to present disclosure, is not used for limiting the right model of the present invention
Enclose.Under the same spirit of the present invention, those skilled in the art can think and various equivalence change.
Such as, two circuit that in each embodiment, icon is directly connected to or interelement, can plant and not affect master
Want other circuit or the element of function；And for example, light-emitting component is not limited to sending out shown in each embodiment
Optical diode (LED), also can be the illuminating circuit of other form；The most such as, shown in embodiment
PMOS can change and can change as PMOS element for NMOS element, NMOS, it is only necessary to corresponding
The amendment circuit processing mode to signal.All this kind, all can analogize according to teachings of the present invention
And obtain, therefore, the scope of the present invention should contain above and other all equivalences change.
Claims (20)
1. a light emitting element driving circuit, in order to drive a light-emitting element circuit, wherein this
Optical element circuit has the light-emitting component of multiple series connection, and to receive a rectified input voltage, it is special
Levying and be, this light emitting element driving circuit comprises:
One switch module, including multiple switches and an ON-OFF control circuit, the most the plurality of switch
Couple with this corresponding light-emitting component respectively, and this ON-OFF control circuit couple with the plurality of switch,
In order to according to this rectified input voltage, to determine the light-emitting component of conducting；
One current source circuit, couples with this switch module, in order to adjust signal according to one, it is provided that
One light-emitting component electric current gives the light-emitting component of conducting, and wherein this light-emitting component electric current maximum maximum exists
In one cycle, at least part of time has close to the waveform profiles of this rectified input voltage whole with this
Stream input voltage has substantially identical phase angle, and, the current peak of this light-emitting component electric current
Value or maximum significantly do not change because the amplitude of this rectified input voltage is different；And
One total harmonic distortion THD compensates circuit, including:
One adaptability multiplier circuit, in order to according to this rectified input voltage, and produces an input
Voltage weighted sampling signal, the value of this input voltage weighted sampling signal is relevant to this rectification input
The peak value of voltage；And
One THD control circuit, couples with this adaptability multiplier circuit, in order to according to this input
Voltage weighted sampling signal, produces this adjustment signal, to determine this light-emitting component electric current.
2. light emitting element driving circuit as claimed in claim 1, wherein, when this rectification inputs
During the amplitude difference of voltage, the current peak of this light-emitting component electric current or maximum are maintained fixing
Value.
3. light emitting element driving circuit as claimed in claim 1, wherein, this THD compensates
Circuit also includes a current setting circuit, couples with this THD control circuit, in order to provide an electricity
Stream sets news, and this THD control circuit also couples with this current setting circuit, according to this input
Voltage weighted sampling signal and this current settings signal, produce this adjustment signal.
4. light emitting element driving circuit as claimed in claim 1, wherein, this adjustment signal with
This rectified input voltage has a substantially identical phase angle.
5. light emitting element driving circuit as claimed in claim 1, wherein, this adaptability multiplication
Device circuit makes the pass between this input voltage weighted sampling signal and this rectified input voltage with direct ratio
It is, and the proportionality coefficient of this direct ratio is relevant to the peak value of this rectified input voltage.
6. light emitting element driving circuit as claimed in claim 5, wherein, when this rectification inputs
When the amplitude of voltage is relatively large, this coefficient is relatively low；Amplitude when this rectified input voltage
Time relatively small, this coefficient is of a relatively high, adjusts to being consequently adapted to property input voltage weighted sampling
Signal so that under this rectified input voltage of various amplitude, all obtains substantially identical or close
Input voltage weighted sampling signal.
7. light emitting element driving circuit as claimed in claim 1, wherein, this adaptability multiplication
Device circuit includes:
One input voltage sense circuit, in order to sense this rectified input voltage, and produces an input
Voltage；
One peak value sensing circuit, couples with this input voltage sense circuit, in order to sense this input
The peak value of voltage, produces a peak value sensing signal；
One multiplexer circuit, couples with this peak value sensing circuit, in order to sense according to this peak value
Signal, produces a regulation coefficient；And
One multiplier, couples with this multiplexer circuit, in order to according to this input voltage dividing potential drop with
This regulation coefficient, produces this input voltage weighted sampling signal.
8. light emitting element driving circuit as claimed in claim 1, wherein, this adaptability multiplication
Device circuit includes:
One input voltage sense circuit, in order to receive this rectified input voltage, and feedbacks according to one
Signal, and produce this input voltage weighted sampling signal；
One comparison circuit, couples with this input voltage sense circuit, in order to compare this input voltage
Weighted sampling signal and a reference signal, produce a comparative result signal；And
One counting circuit, couples with this comparison circuit, in order to according to this comparative result signal, produces
This feedback signal raw.
9. light emitting element driving circuit as claimed in claim 1, wherein, this adaptability multiplication
Device circuit also includes a clamp circuit, in order to preset level according to one, and limits this input voltage
One maximum of weighted sampling signal.
10. light emitting element driving circuit as claimed in claim 1, wherein, this adaptability is taken advantage of
The backward end of the light-emitting component that adder circuit is corresponding with connects and not straight with this rectified input voltage
Connect in succession, in order to receive a builtin voltage.
The driving method of 11. 1 kinds of light-emitting element circuits, wherein this light-emitting element circuit has many
The light-emitting component of individual series connection, it is characterised in that the driving method of this light-emitting element circuit comprises:
One rectified input voltage is provided；
According to this rectified input voltage, to determine the light-emitting component of conducting；
According to this rectified input voltage, and produce an input voltage weighted sampling signal, this input
The value of voltage weighted sampling signal is relevant to the peak value of this rectified input voltage；
According to this input voltage weighted sampling signal, produce an adjustment signal；And
According to this adjustment signal, it is provided that a light-emitting component electric current gives the light-emitting component of conducting, one
In cycle at least part of time have close to this rectified input voltage waveform profiles and with this rectification
Input voltage has substantially identical phase angle, and, the current peak of this light-emitting component electric current
Or maximum does not significantly change because the amplitude of this rectified input voltage is different.
The driving method of 12. light-emitting element circuits as claimed in claim 11, wherein, when this
During the amplitude difference of rectified input voltage, the current peak of this light-emitting component electric current or maximum dimension
Hold as fixed value.
The driving method of 13. light-emitting element circuits as claimed in claim 11, wherein, this root
According to this input voltage weighted sampling signal, the step producing an adjustment signal also comprises: according to this
Input voltage weighted sampling signal and a current settings signal, produce this adjustment signal, wherein should
Current settings signal is in order to determine lower limit or the upper limit of this adjustment signal.
The driving method of 14. light-emitting element circuits as claimed in claim 11, wherein, this tune
Whole signal and this rectified input voltage have a substantially identical phase angle.
The driving method of 15. light-emitting element circuits as claimed in claim 11, wherein, this is defeated
Enter the relation between voltage weighted sampling signal and this rectified input voltage with direct ratio, and this direct ratio
Proportionality coefficient be relevant to the peak value of this rectified input voltage.
The driving method of 16. light-emitting element circuits as claimed in claim 15, wherein, when this
When the amplitude of rectified input voltage is relatively large, this coefficient is relatively low；When this rectification input electricity
When the amplitude of pressure is relatively small, this coefficient is of a relatively high, adjusts input voltage to being consequently adapted to property
Weighted sampling signal so that under this rectified input voltage of various amplitude, all obtains essence phase
Same or close input voltage weighted sampling signal.
The driving method of 17. light-emitting element circuits as claimed in claim 11, wherein, this root
According to this rectified input voltage, and the step producing this input voltage weighted sampling signal includes:
Receive this rectified input voltage, and produce an input voltage dividing potential drop；
According to this input voltage dividing potential drop, produce a peak value sensing signal；
Sense signal according to this peak value, produce a regulation coefficient；And
According to this input voltage dividing potential drop and this regulation coefficient, produce this input voltage weighted sampling news
Number.
The driving method of 18. light-emitting element circuits as claimed in claim 11, wherein, this root
According to this rectified input voltage, and the step producing this input voltage weighted sampling signal includes:
Receive this rectified input voltage, and according to a feedback signal, and produce this input voltage and add
Power sample signal；
Relatively this input voltage weighted sampling signal and reference signal, produces comparative result news
Number；And
According to this comparative result signal, produce this feedback signal.
The driving method of 19. light-emitting element circuits as claimed in claim 11, wherein, this root
According to this rectified input voltage, and the step producing this input voltage weighted sampling signal also includes:
Preset level according to one, and limit a maximum of this input voltage weighted sampling signal.
The driving method of 20. light-emitting element circuits as claimed in claim 11, wherein, this root
According to this rectified input voltage, and the step producing this input voltage weighted sampling signal includes:
Indirectly a builtin voltage is obtained from this rectified input voltage from the backward end of a light-emitting component,
The forward end of this light-emitting component is coupled to this rectified input voltage；And
According to this builtin voltage, and produce this input voltage weighted sampling signal.
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