CN105873308B - The driving method of light emitting element driving circuit and light-emitting element circuit - Google Patents
The driving method of light emitting element driving circuit and light-emitting element circuit Download PDFInfo
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- CN105873308B CN105873308B CN201510029224.XA CN201510029224A CN105873308B CN 105873308 B CN105873308 B CN 105873308B CN 201510029224 A CN201510029224 A CN 201510029224A CN 105873308 B CN105873308 B CN 105873308B
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Abstract
The present invention proposes the driving method of a kind of light emitting element driving circuit and light-emitting element circuit.Light emitting element driving circuit to drive with it is multiple series connection light-emitting components light-emitting element circuit.Light emitting element driving circuit determines that driven light-emitting component, light emitting element driving circuit include according to rectified input voltage：Switch module, current source circuit and total harmonic distortion (total harmonic distortion, THD) compensation circuit.Wherein, THD compensation circuits generate adjustment signal according to rectified input voltage.Current source circuit according to adjustment signal, provides the light-emitting component that light-emitting component electric current gives conducting, to reduce total harmonic distortion in turn.Wherein under the rectified input voltage of various amplitude, current peak or maximum of the light-emitting component electric current in a period are maintained fixed value.
Description
Technical field
The present invention relates to a kind of light emitting element driving circuit and the driving methods of light-emitting element circuit, particularly relate to a kind of tool
There are the light emitting element driving circuit and light-emitting component electricity that total harmonic distortion (total harmonic distortion, THD) compensates
The driving method on road.
Background technology
Figure 1A show a kind of prior art light emitting diode (light emitting diode, LED) driving circuit 10 and
The schematic diagram of its interlock circuit.As shown in Figure 1A, LED drive circuit 10 includes switching circuit 11, ON-OFF control circuit 12 and consolidates
Constant current source 13.For LED drive circuit 10 to drive LED circuit 20, wherein LED circuit 20 includes multiple concatenated LED, is such as schemed
Shown in 1A, this multiple concatenated LED is divided into LED groups G1, G2, G3 and G4.Switching circuit 11 include switch S1, S2, S3, and
Tetra- switches of S4.As shown in Figure 1A, switch S1-S4 is electrically connected the position appropriate in LED circuit 20, to control LED groups
Group G1-G4.AC power 40 generates alternating voltage, and rectification circuit 30 carries out rectification to this alternating voltage, and generates such as Figure 1B institutes
The rectified input voltage Vin shown.And LED drive circuit 10 drives the basic mode of LED circuit 20, is according to rectified input voltage
The level of Vin is connected or is not turned on wherein different switch S1-S4, and makes the LED groups G1-G4 in LED circuit 20, wherein
One or more LED groups shine.
For example, as in Figure 1B signal oscillogram illustrated, when rectified input voltage Vin1 level be less than level L1
When, switch S1-S4 is all not turned on, and LED groups G1-G4 neither shines；When rectified input voltage Vin level between level L1 with
Between L2, switch S1 conductings, switch S2-S4 is not turned on, and LED groups G1 shines；When rectified input voltage Vin1 level between
Between level L2 and L3, switch S2 conductings, switch S1, S3-S4 are not turned on, and LED groups G1-G2 shines；Work as rectified input voltage
Between level L3 and L4, switch S1-S2, switch S3 conductings are not turned on, LED groups G1-G3 shines the level of Vin with S4；
When the level of rectified input voltage Vin is more than level L4, switch S4 is connected, and switch S1-S3 is not turned on, LED groups G1-G4 hairs
Light.Relevant LED drive circuit 10 can refer to United States Patent (USP) case the 7th, 081 according to the type of drive of rectified input voltage Vin,
No. 722 cases and No. 2011/0273102 case of U.S. Patent Application No..
Wherein, under the conditions of the peak level of rectified input voltage Vin1 is fixed, fixed current source 13 provides fixed big
Small electric current, when so that one or more LED groups shining in LED groups G1-G4, the electric current for flowing through LED therein is definite value.
If the signal waveform of electric current I1 in Figure 1B is illustrated, when no matter one or more LED groups shine in LED groups G1-G4, flowed
The electric current of warp is all fixed, and only when the level of rectified input voltage Vin is less than level L1, that is, switch S1-S4 is neither
In the case of conducting, electric current I1 is zero current.
For with the driving circuit of direct voltage drive LED circuit, the advantages of prior art LED drive circuit 10
It is rectified input voltage Vin are converted to DC voltage, the cost of manufacture can be saved；And work as rectified input voltage
The enough height of the frequency of Vin, naked eyes do not see the flicker of LED circuit 20 yet.And the shortcomings that prior art LED drive circuit 10, is,
Its total harmonic distortion (total harmonic distortion, THD) is higher.In addition, when the peak level of rectified input voltage
When different, as shown in Figure 1B, rectified input voltage Vin1 is different from the peak level of Vin2, can lead to the LED's for flowing through conducting
Electric current I1 is different from I2.
In view of this, the present invention i.e. in view of the above shortcomings of the prior art, proposes a kind of light-emitting component with THD compensation
The driving method of driving circuit and light-emitting element circuit, and flow through the light-emitting component electric current of conducting not because of rectified input voltage not
It is same and different.
Invention content
It is an object of the invention to overcome the deficiencies in the prior art and defect, propose a kind of luminous member with THD compensation
The driving method of part driving circuit and light-emitting element circuit, and the light-emitting component electric current of conducting is flowed through not because of rectified input voltage
It is different and different.
In order to achieve the above object, saying that the present invention provides a kind of light emitting element driving circuits, to drive with regard to one of viewpoint
A dynamic light-emitting element circuit, the wherein light-emitting element circuit have multiple concatenated light-emitting components, to receive rectification input electricity
Pressure, the light emitting element driving circuit include：One switch module, including multiple switch and an ON-OFF control circuit, wherein multiple
Switch is coupled with the corresponding light-emitting component respectively, and the ON-OFF control circuit is coupled with multiple switch, to whole according to this
Input voltage is flowed, determines the light-emitting component of conducting；One current source circuit is coupled with the switch module, to be interrogated according to an adjustment
Number, provide the light-emitting component that a light-emitting component electric current gives conducting, wherein the light-emitting component electric current maximum at least portion in a period
With the waveform profiles close to the rectified input voltage and with the rectified input voltage with substantially identical phase angle between timesharing,
Also, the current peak or maximum of the light-emitting component electric current not because the amplitude of the rectified input voltage difference due to significant changes；
And total harmonic distortion (total harmonic distortion, a THD) compensation circuit, including：One adaptability multiplier electricity
Road to according to the rectified input voltage, and generates an input voltage weighted sampling signal, the input voltage weighted sampling signal
Value be relevant to the peak value of the rectified input voltage；And THD control circuits, it couples, uses with the adaptability multiplier circuit
According to the input voltage weighted sampling signal, to generate the adjustment signal, to determine the light-emitting component electric current.
In wherein a kind of preferred embodiment, when the amplitude difference of the rectified input voltage, the light-emitting component electric current
Current peak or maximum be maintained fixed value.
In wherein a kind of preferred embodiment, which further includes a current setting circuit, is controlled with the THD
Circuit coupling processed, to provide electric current setting news, and the THD control circuits are also coupled with the current setting circuit, according to this
Input voltage weighted sampling signal and the electric current setting signal, generate the adjustment signal.
In wherein a kind of preferred embodiment, which has a substantially identical phase with the rectified input voltage
Parallactic angle.
In wherein a kind of preferred embodiment, the adaptability multiplier circuit make the input voltage weighted sampling signal with
Relationship with direct ratio between the rectified input voltage, and the proportionality coefficient of the direct ratio is relevant to the peak value of the rectified input voltage.
In wherein a kind of preferred embodiment, when the amplitude of the rectified input voltage is relatively large, the coefficient is opposite
It is relatively low；When the amplitude of the rectified input voltage is relatively small, the coefficient is relatively high, and input electricity is adaptively adjusted by this
Press weighted sampling signal so that under the rectified input voltage of various amplitude, obtain substantially identical or close input electricity
Press weighted sampling signal.
In wherein a kind of preferred embodiment, which includes：One input voltage sense circuit is used
To sense the rectified input voltage, and generate input voltage partial pressure；One peak value sensing circuit, with the input voltage sense circuit
Coupling generates a peak value and senses signal to sense the peak value of input voltage partial pressure；One multiplexer circuit, with the peak value
Sensing circuit couples, and to sense signal according to the peak value, generates a regulation coefficient；And a multiplier, with the multiplexer
Circuit couples, according to input voltage partial pressure and the regulation coefficient, to generate the input voltage weighted sampling signal.Wherein
In a kind of preferred embodiment, which includes：One input voltage sense circuit, it is defeated to receive the rectification
Enter voltage, and according to a feedback signal, and generates the input voltage weighted sampling signal；One comparison circuit, with the input voltage
Sensing circuit couples, and to compare the input voltage weighted sampling signal and a reference signal, generates a comparison result signal；With
And a counting circuit, it is coupled with the comparison circuit, according to the comparison result signal, to generate the feedback signal.
In wherein a kind of preferred embodiment, which further includes a clamp circuit, to basis
One default level, and limit a maximum value of the input voltage weighted sampling signal.
In wherein a kind of preferred embodiment, the backward end of adaptability multiplier circuit light-emitting component corresponding with one
Connection with the rectified input voltage without being directly connected to, to receive a builtin voltage.
In order to achieve the above object, another viewpoint is sayed, the present invention provides a kind of driving method of light-emitting element circuit,
In the light-emitting element circuit there are multiple concatenated light-emitting components, the driving method of the light-emitting element circuit includes：It is whole to provide one
Flow input voltage；According to the rectified input voltage, to determine the light-emitting component of conducting；According to the rectified input voltage, and generate
The value of one input voltage weighted sampling signal, the input voltage weighted sampling signal is relevant to the peak value of the rectified input voltage；
According to the input voltage weighted sampling signal, an adjustment signal is generated；And according to the adjustment signal, provide light-emitting component electricity
Stream gives the light-emitting component of conducting, in a period at least partly the time have close to the rectified input voltage waveform profiles and with
The rectified input voltage have substantially identical phase angle, also, the current peak of the light-emitting component electric current or maximum not because
The amplitude of the rectified input voltage is different and significant changes.
Below by specific embodiment elaborate, when be easier to understand the purpose of the present invention, technology contents, feature and its
The effect of reached.
Description of the drawings
Figure 1A show a kind of prior art light emitting diode (light emitting diode, LED) driving circuit 10 and
The schematic diagram of its interlock circuit；
Figure 1B shows the signal waveform schematic diagram of prior art LED drive circuit 10 and its interlock circuit；
One embodiment of Fig. 2A and 2B display present invention；
Second embodiment of Fig. 3 display present invention；
The third embodiment of Fig. 4 display present invention；
The 4th embodiment of Fig. 5 display present invention；
The 5th embodiment of Fig. 6 display present invention；
The 6th embodiment of Fig. 7 display present invention；
Fig. 8 A-8C illustrate the embodiment and operation mechanism of clamp circuit 1316；
Fig. 9 A show an alternative embodiment of the invention；
Fig. 9 B show compareing for Fig. 9 A embodiments and preceding several embodiments；
Figure 10 A-10E give a few examples how display current source circuit 120 according to adjustment electric current Id provides light-emitting component electric current
ILED。
Symbol description in figure
10 LED drive circuits
11 switching circuits
12 ON-OFF control circuits
13,120a fixed current sources
20 LED circuits
21 light-emitting element circuits
30 rectification circuits
40 AC powers
100,200 light emitting element driving circuits
110 switch modules
120 current source circuits
130 THD compensation circuits
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 circuits
1316 clamp circuits
1317 multipliers
1324 up/down number control circuits
1326 counters
1411,1421 latch circuits
Number control circuit on 1413
1423 times several control circuits
G1-G4 LED groups
A1-A3 error amplifiers
CR, CRU, CRD comparison result signal
Digital communication number under DC
Id adjusts electric current
ILED, ILED1, ILED2 light-emitting component electric current
ISET electric current setting signals
I1, I2 electric current
K1-Kn coefficients
LH, LHU, LHD latch signal
L1-L4 levels
Q1-Q6 transistors
Ra-Rb, R1, R3, R4 resistance
R2 variable resistances
S1-S4 is switched
T0-t3 time points
The upper digital communications number of UC
UD up/down digital communications number
Vin, Vin1, Vin2 rectified input voltage
Vint builtin voltages
Vp1, Vp2 peak level (peak value)
Vref, Vref1, Vref2 reference signal
Specific implementation mode
Fig. 2A and 2B are please referred to, shows one embodiment of the present invention.As shown in Figure 2 A, light emitting element driving circuit
100 to drive light-emitting element circuit, with multiple concatenated light-emitting components.Wherein, light-emitting element circuit is for example but unlimited
In for LED circuit 20 above-mentioned, such as, but not limited to including multiple concatenated LED, and this multiple concatenated LED points are multiple
LED groups are divided into G1, G2, G3 and tetra- LED groups of G4 such as, but not limited to such as LED circuit 20.As shown in Figure 2 A.It needs
Bright, light-emitting element circuit is not limited to LED circuit 20, only includes that single LED goes here and there, light-emitting element circuit can also be by multiple
The light-emitting device array etc. that the LED array or other light-emitting component connection in series-parallel that LED connection in series-parallel is formed are formed.Rectification circuit
30 generate rectified input voltage Vin, with the difference of application scenario, the amplitude of this rectified input voltage Vin may it is different or because
Power supply is unstable, and even if in identical application scenario, the amplitude of rectified input voltage Vin may also change；Refering to Fig. 2 B, rectification
Input voltage vin may be the rectified input voltage Vin2 of the rectified input voltage Vin1 or higher amplitudes compared with short arc.Hair
Optical element circuit receives rectified input voltage Vin, and light emitting element driving circuit 100 changes according to rectified input voltage Vin
Driven light-emitting component in light-emitting element circuit.
Please continue to refer to Fig. 2A, light emitting element driving circuit 100 include switch module 110, current source circuit 120 and
Total harmonic distortion (total harmonic distortion, THD) compensation circuit 130.Wherein, switch module 110 includes for example
But it is not limited to switching circuit 111 as shown in Figure 1A and ON-OFF control circuit 112.Wherein, switching circuit 111 includes multiple switch
(such as comprising S1, S2, S3 and tetra- switches of S4, as shown in Figure 1A), it is electric with corresponding LED groups G1, G2, G3 and G4 respectively
Connection.ON-OFF control circuit 112 determines according to rectified input voltage Vin in multiple LED, driven LED, these are connected
Corresponding LED and shine.For example, with 10 same mechanism of prior art LED drive circuit, such as work as rectified input voltage
When the level of Vin (Vin1 or Vin2) is less than level L1, switch S1-S4 is all not turned on, and LED groups G1-G4 neither shines；When whole
The level of input voltage vin (Vin1 or Vin2) is flowed between level L1 and L2, switch S1 conductings, switch S2-S4 is not turned on,
LED groups G1 shines；When the level of rectified input voltage Vin (Vin1 or Vin2) is between level L2 and L3, switch S2 is led
Logical, switch S1, S3-S4 are not turned on, and LED groups G1-G2 shines；When the level of rectified input voltage Vin (Vin1 or Vin2) is situated between
Between level L3 and L4, switch S1-S2, switch S3 conductings are not turned on, LED groups G1-G3 shines with S4；When rectification inputs
The level of voltage Vin (Vin1 or Vin2) is more than level L4, and switch S4 is connected, and switch S1-S3 is not turned on, LED groups G1-G4 hairs
Light.
Unlike prior art LED drive circuit 10, in the present embodiment, current source circuit 120 in addition to switch
It except module 110 couples, is separately coupled with THD compensation circuits 130, according to adjustment signal, to provide light-emitting component electric current ILED and give
The light-emitting component of conducting.THD compensation circuits 130 are coupled with current source circuit 120, to according to rectified input voltage Vin (Vin1
Or Vin2), generate adjustment signal.Adjustment signal adjusting light-emitting component electric current ILED, make its in a period at least partly
It (is, for example, close to semifocal chord wave that time (such as when the conducting of any LED groups), which has the waveform profiles close to rectified input voltage Vin,
Waveform profiles) and there is substantially identical phase angle, also, the electricity of light-emitting component electric current ILED with rectified input voltage Vin
Stream peak value (i.e. extreme currents in a period) not significant changes due to the amplitude of rectified input voltage difference, also that is, it is maximum in
Under the situation of the rectified input voltage Vin1 and Vin2 (peak level Vp1 is different with Vp2) of various amplitude, light-emitting component electric current
The current peak of ILED maintains in a default range and preferably fixed value.So-called " current peak ", may be not only in list
One time point reached the maximum (refering to the ILED waveforms of Fig. 2 B), and the maximum (ginseng may be also maintained within a duration
The ILED waveforms for readding Fig. 8 B, are detailed later).Also that is, it is characteristic of the invention that：Light-emitting component electric current ILED in a period at least
Part-time has a substantially identical phase angle with rectified input voltage Vin, therefore reduces THD, and light-emitting component electricity
The current peak of the ILED not significant changes due to amplitude of rectified input voltage difference are flowed, therefore in different application scenarios, hair
Optical element electric current ILED is still identical or close, and be not easy to there is a phenomenon where flicker (flicker).
In a kind of preferred embodiment, the signal waveform for adjusting signal is such as, but not limited to anticipated as shown in Figure 2 B；Adjustment
Signal is semifocal chord wave and has substantially identical phase angle with rectified input voltage Vin.It should be noted that so-called have substantive phase
Same phase angle is not offered as necessary infallible poorly lucky phase angle having the same, and should be regarded as may be allowed to have a little
Deviate, if compared to fixed value light-emitting component electric current (such as the signal waveform institute of prior art current I1 and I2 in Figure 1B
Signal), with the application of the invention, making rectified input voltage Vin and light-emitting component electric current ILED in contrast there is the phase being closer to
Angle, and THD can be reduced.In the present embodiment, when rectified input voltage Vin (Vin1 or Vin2) is more than level L1, hair
Optical element electric current ILED and rectified input voltage Vin (Vin1 or Vin2) has substantially identical phase angle.
In the present embodiment, THD compensation circuits 130 include adaptability multiplier circuit 131, THD control circuits 133, with
Current setting circuit 135.Adaptability multiplier circuit 131 generates to according to rectified input voltage Vin (Vin1 or Vin2)
Input voltage weighted sampling signal, sampling value are relevant to the peak value of rectified input voltage Vin.THD control circuits 133 and adaptation
Property multiplier circuit 131 couple, interrogated according to input voltage weighted sampling signal and electric current setting signal ISET, to generate adjustment
Number.Current setting circuit 135 is coupled with THD control circuits 133, to provide electric current setting signal ISET.In another embodiment
In, THD compensation circuits 130 can only include adaptability multiplier circuit 131 and THD control circuits 133, and omit electric current setting
Circuit 135 (therefore current setting circuit 135 and electric current setting signal ISET are painted with dotted line in figure).
Fig. 3 shows that second embodiment of the invention, the present embodiment citing show a kind of reality of adaptability multiplier circuit 131
Apply mode.In the present embodiment, adaptability multiplier circuit 131 includes input voltage sense circuit 1311, peak value sensing circuit
1313, multiplexer circuit 1315 and multiplier 1317.Input voltage sense circuit 1311 is sensing rectified input voltage
Vin and generate and the relevant signals of rectified input voltage Vin, wherein should " with the relevant signals of rectified input voltage Vin " for example
But it is not limited to the partial pressure (" input voltage partial pressure ") of rectified input voltage Vin.Peak value sensing circuit 1313 and input voltage sense
Slowdown monitoring circuit 1311 couples, and generates peak value to sense the peak value of input voltage partial pressure and senses signal.Because input voltage partial pressure with
Rectified input voltage Vin is related, therefore peak value sensing signal is also related to the peak value of rectified input voltage Vin.Multiplexer electricity
Road 1315 is coupled with peak value sensing circuit 1313, to sense signal according to peak value, generates regulation coefficient.As shown, more
Business device circuit 1315 for example senses signal according to peak value, in a manner of for example tabling look-up, selects coefficient appropriate in COEFFICIENT K 1-Kn,
As regulation coefficient.Multiplier 1317 and multiplexer circuit 1315 couple, to according to input voltage partial pressure and regulation coefficient,
Generate input voltage weighted sampling signal.The present embodiment illustrates a kind of adaptability multiplier circuit for having and opening circuit control model
131, it is divided according to input voltage, is multiplied by a coefficient, makes example between input voltage weighted sampling signal and rectified input voltage
Such as relationship with direct ratio, and the coefficient is relevant to the peak value of rectified input voltage Vin, therefore input voltage weighted sampling signal
Value also relating to rectified input voltage Vin peak value.
Certainly, according to the present invention, multiplexer circuit 1315 is not limited to determine regulation coefficient with the mechanism tabled look-up, can also
Using other mechanism, such as regulation coefficient is determined in a manner of metal fuse (metal fuse) finishing (trim).Peak value senses
Circuit 1313 is also not limited to the peak value of sensing input voltage partial pressure, can also sense the slope etc. into voltage, and generates peak
Value sensing signal.In short, second embodiment is illustrated：To open circuit control model, input voltage partial pressure is multiplied by a coefficient and is made
For input voltage weighted sampling signal, and the coefficient is relevant to the peak value of rectified input voltage Vin.Its actual embodiment has
Various change is not limited to the mode of diagram.When the amplitude of rectified input voltage Vin relatively large (therefore peak value is higher),
The coefficient is relatively low；When the amplitude of rectified input voltage Vin relatively small (therefore peak value is relatively low), the coefficient is relatively
Height adjusts to being consequently adapted to property input voltage weighted sampling signal so that and no matter rectified input voltage Vin is Vin1 or Vin2,
Obtain substantially identical or close input voltage weighted sampling signal.(depending on the adjustable range of coefficient, if Vin1x K1
=Vin2x K2 can make rectified input voltage Vin1 or Vin2 obtain reality then in the case where not considering circuit element error
The identical input voltage weighted sampling signal of matter, in the case, no matter rectified input voltage is Vin1 or Vin2, light-emitting component
The current peak or maximum of electric current ILED can be maintained fixed value；If but available coefficient value cannot make Vin1x K1 just
=Vin2x K2 are then only capable of obtaining close input voltage weighted sampling signal, in the case, if rectified input voltage exists
Change between Vin1 and Vin2, the current peak or maximum of light-emitting component electric current ILED can maintain in a default range and
It will not significant changes.)
THD control circuits 133 are according to input voltage weighted sampling signal and electric current setting signal ISET or according to input
Voltage weighted sampling signal generates adjustment signal without electric current setting signal ISET, this adjusts signal to control electric current
Source circuit 120 provides light-emitting component electric current ILED.Details in relation to THD control circuits 133 please refers to same applicant institute Shen
Fig. 5 A-10C of TW patent application cases the 103120122nd (Chinese patent application case the 201410275924.2nd) please,
There can be many variations, not be specified in this one by one.In short, because of example between input voltage weighted sampling signal and rectified input voltage
Such as with direct ratio relationship, as long as therefore THD control circuits 133 according to input voltage weighted sampling signal come generate have correspond to
The waveform (can be with phase or reverse phase) of profile, so that it may using as adjustment signal, which can be current signal or voltage
Signal.And electric current setting signal ISET caused by current setting circuit 135 can determine a current reference value, such as to determine
Lower limit or the upper limit etc. for adjusting signal, thus set lower limit or upper limit of light-emitting component electric current ILED etc..
How current source circuit 120 according to adjustment signal provides light-emitting component electric current ILED, has various ways, the present invention
It is not limited to any of which.It adjusts signal to be such as, but not limited to include a kind of form of electric current, i.e., such as Figure 10 A-10E institutes
Show, to adjust electric current Id as adjustment signal.For example, please referring to Fig.1 0A-10B, current source circuit 120 can be one
Current replication circuit (current replication circuit has various forms, and the invention is not limited in any of which), and light-emitting component
Electric current ILED is for example equal to or is proportional to adjustment electric current Id (when any switch conduction in switch S1-S4, similarly hereinafter), depending on the electricity
Depending on the duplication ratio for flowing duplicate circuit.Figure 10 C show the another embodiment of current source circuit 120, in the present embodiment
The resistance value that adjustment electric current Id is multiplied by resistance Ra is equal to the resistance value that light-emitting component electric current ILED is multiplied by resistance Rb, therefore according to resistance
The setting of Ra and Rb, light-emitting component electric current ILED can equally be equal to or be proportional to adjustment electric current Id.Figure 10 D-10E, which are shown, to shine
Element current ILED can also be that adjustment electric current Id subtracts or add a fixed current.10D figures show the former, current source circuit
Such as, but not limited to include a fixed current source 120a in 120, and light-emitting component electric current ILED subtracts this for adjustment signal Id and consolidates
The fixed current that constant current source 120a is determined；Figure 10 E show the latter, include fixed current source 120a in current source circuit 120,
And light-emitting component electric current ILED adds the fixed current that fixed current source 120a is determined for adjustment electric current Id.
The embodiment of figure 10 above A-10E is not limited to be used alone, also can be with two or more combination applications.
The third embodiment of Fig. 4 display present invention, the present embodiment citing show the another of adaptability multiplier circuit 131
Kind embodiment.In the present embodiment, adaptability multiplier circuit 131 includes input voltage sense circuit 1311, comparison circuit
1312, with counting circuit 1314.Input voltage sense circuit 1311 is interrogated to sense rectified input voltage Vin according to feedback
Number, and generate input voltage weighted sampling signal.Comparison circuit 1312 is coupled with input voltage sense circuit 1311, to compare
Input voltage weighted sampling signal (is not shown, can be single or multiple reference signals, illustrate after appearance) with reference signal, generates ratio
Compared with result signal.Counting circuit 1314 is coupled with comparison circuit, according to comparison result signal, to generate feedback signal.With
Unlike two embodiments, the present embodiment illustrates a kind of adaptability multiplier circuit 131 of the control model with loop circuit,
According to input voltage weighted sampling signal, feedback controls input voltage sense circuit, is taken so that input voltage weighting is adaptively adjusted
Relationship between sample signal and rectified input voltage Vin makes the relationship for keeping such as direct ratio at any time therebetween, and input voltage weighting takes
The value of sample signal is relevant to the amplitude or peak value that rectified input voltage is Vin.
The 4th embodiment of Fig. 5 display present invention.The present embodiment shows that adaptability multiplier circuit 131 is a kind of more specific
Embodiment.As shown, in the present embodiment, adaptability multiplier circuit 131 includes input voltage sense circuit 1311, ratio
Compared with circuit 1312 and counting circuit 1314.Input voltage sense circuit 1311 is for example with concatenated resistance R1 and variable resistance
R2, and the resistance value of variable resistance R2 is adjusted by feedback signal.Input voltage weighted sampling signal is for example derived from variable resistance R2
On partial pressure.Comparison circuit 1312 for example with error amplifier A1, compares input voltage weighted sampling signal (in this embodiment
In, input voltage weighted sampling signal is the partial pressure on variable resistance R2) and reference signal Vref, generate comparison result signal
CR.Counting circuit 1314 includes latch circuit 1322, up/down number control circuit 1324 and counter 1326.Latch circuit 1322
According to comparison result signal CR, latch signal LH is determined.Up/down number control circuit 1324 determines up/down according to latch signal LH
Digital communication UD.Counter 1326 executes the operation of up/down number, to generate feedback signal, to adjust according to up/down digital communication UD
The resistance value of variable resistance R2.Thus, which the amplitude regardless of rectified input voltage Vin, utilizes closing back for the present embodiment
Road controlling mechanism, input voltage weighted sampling signal capable of feedback control, makes it not influenced by the amplitude of rectified input voltage Vin,
Such as the peak level of input voltage weighted sampling signal is made to fix, and then make light-emitting component electric current ILED not because rectification inputs electricity
It presses the amplitude of Vin different and changes.
The 5th embodiment of Fig. 6 display present invention.The present embodiment, which shows that adaptability multiplier circuit 131 is another, relatively to be had
The embodiment of body.As shown, in the present embodiment, adaptability multiplier circuit 131 include input voltage sense circuit 1311,
Comparison circuit 1312 and counting circuit 1314.Input voltage sense circuit 1311 for example with concatenated resistance R1 with can power transformation
R2 is hindered, and the resistance value of variable resistance R2 is adjusted by feedback signal.Input voltage weighted sampling signal is for example derived from variable resistance
Partial pressure on R2.Comparison circuit 1312 for example with error amplifier A2 and A3, is respectively compared input voltage weighted sampling signal
(in this embodiment, input voltage weighted sampling signal is the partial pressure on variable resistance R2) and reference signal Vref1/Vref2,
And comparison result signal CRU and CRD are generated respectively.Counting circuit 1314 includes latch circuit 1411 and 1421, upper number control electricity
Road 1413, lower several control circuits 1423 and counter 1431.Latch circuit 1411 and 1421 is respectively according to comparison result signal
CRU and CRD determines latch signal LHU and LHD.Upper several control circuits 1413 are according to latch signal LHU, digital communication UC in decision.
Lower several control circuits 1423 determine lower digital communication DC according to latch signal LHD.Counter 1431 is according to upper digital communication UC and lower number
Signal DC executes the operation of up/down number, to generate feedback signal, to adjust the resistance value of variable resistance R2.Thus, nothing
By rectified input voltage Vin amplitude how, using the loop circuit controlling mechanism of the present embodiment, input voltage capable of feedback control adds
Sample signal is weighed, so that it is not influenced by the amplitude of rectified input voltage Vin, such as make the wave crest of input voltage weighted sampling signal
Level is fixed, and then light-emitting component electric current ILED is made not change because of the amplitude of rectified input voltage Vin difference.
The 6th embodiment of Fig. 7 display present invention.As shown in fig. 7, light emitting element driving circuit 100 is luminous to drive
Element circuitry 21, with multiple concatenated light-emitting components.Wherein, light-emitting element circuit 21 is such as, but not limited to above-mentioned
LED circuit 20.Light emitting element driving circuit 100 includes switch module 110, current source circuit 120 and THD compensation circuits
130.Wherein, THD compensation circuits 130 include adaptability multiplier circuit 131, THD control circuits 133 and current setting circuit
135.Wherein, adaptability multiplier circuit 131 includes input voltage sense circuit 1311, comparison circuit 1312, counting circuit
1314, with clamp circuit 1316.Adaptability multiplier circuit 131 generates input voltage to according to rectified input voltage Vin
Weighted sampling signal.Also, the clamp circuit 1316 in adaptability multiplier circuit 131 adds input voltage weighted sampling signal
It is handled with clamper, and generates clamper input voltage weighted sampling signal.Clamp circuit 1316 and input voltage sense circuit 1311
Coupling presets level (being not shown, in rear detailed description) to basis, and limits the maximum value of input voltage weighted sampling signal.THD
Control circuit 133 is coupled with the clamp circuit 1316 in adaptability multiplier circuit 131, to be weighted according to clamper input voltage
Sample signal and electric current setting signal ISET generate adjustment signal.Current setting circuit 135 is coupled with THD control circuits 133,
To provide electric current setting signal ISET.Maximum should be noted that the current setting circuit 135 in the present embodiment is set with electric current
Signal ISET equally can be omitted.
The present embodiment is intended to illustrate, adaptability multiplier circuit 131 may also include clamp circuit 1316, using will input electricity
The way for pressing weighted sampling signal clamper makes input voltage weighted sampling signal be not higher than preset level.Due to adjusting signal
It is relevant to input voltage weighted sampling signal, and light-emitting component electric current ILED is relevant to adjustment signal, therefore limit input electricity
After the maximum value for pressing weighted sampling signal, the maximum current value of light-emitting component electric current ILED can be accordingly limited, or in phase
Under same maximum value, change the waveform and integrated value of light-emitting component electric current ILED.As for THD's and light-emitting component electric current ILED
The adjustment of current value, the demand of visual user adjust the default level of clamp circuit 1316 and reach.
Fig. 8 A-8C illustrate the embodiment and operation mechanism of clamp circuit 1316.In fig. 8 a, clamp circuit 1316
It such as but is not limited to include a multiplexer, to choose input voltage weighted sampling signal with junior in default level as pincers
Position voltage weighted sampling signal.Signal waveform therein is anticipated as shown in Figure 8 B.In the present embodiment, rectified input voltage Vin is as schemed
It is shown semifocal chord wave, input voltage weighted sampling signal is, for example, the partial pressure of rectified input voltage Vin, thus is also as shown in the figure
Semifocal chord wave, and clamper input voltage weighted sampling signal is when input voltage weighted sampling signal is less than default level, with
Input voltage weighted sampling signal is identical, when input voltage weighted sampling signal is more than default level, then maintains default position
It is accurate as shown in the figure.Therefore, the current value of part light-emitting component electric current ILED can be fixed on maximum value, angle is applied from a kind of
For, the maximum current value of light-emitting component electric current ILED can be limited, or from another kind using for angle, it is identical most
Under big value, because changing the waveform of light-emitting component electric current ILED, integrated value is made to increase, therefore light-emitting component electricity can be improved
Flow the current value of ILED entirety.Clamp circuit 1316 is not limited to reach with multiplexer, such as shown in Fig. 8 C embodiment
In, clamp circuit 1316 can be a buffer circuit, and the operation upper voltage limit received is the default level, in this way, when defeated
It is more than when presetting level to enter the received input voltage weighted sampling signal in end, and the output end of clamp circuit 1316 can only export this
Default level, this is also a kind of embodiment of clamp circuit 1316.
Fig. 9 A show an alternative embodiment of the invention；Fig. 9 B show compareing for Fig. 9 A embodiments and preceding several embodiments.
Light emitting element driving circuit 200 shown in Fig. 9 A embodiments exists with preceding several embodiment (such as Fig. 2A embodiments) differences
In in the present embodiment, light emitting element driving circuit 200 does not receive rectified input voltage Vin directly.It shines with shown in Fig. 2A
Element driving circuit 100 is compared, and the present embodiment light emitting element driving circuit 100 not as shown in Figure 2 A directly receives rectification
Input voltage vin, but receive the voltage of LED groups G1 backward ends.Please referring next to Fig. 9 B, compare light emitting element driving circuit
100 with 200 related signal waveform of light emitting element driving circuit, wherein indicate the light-emitting component electric current ILED of Fig. 2A with ILED1, and
The light-emitting component electric current ILED of Fig. 9 A is indicated with ILED2.As shown in Figure 9 B, the THD compensation electricity in light emitting element driving circuit 100
Road 130 receives rectified input voltage Vin, is complete semifocal chord wave, since the initial point (time point t0) in period, continues entire week
Phase (to time point t3), and light-emitting component electric current ILED1 caused by light emitting element driving circuit 100, it can postpone as shown in the figure
For a period of time, be just not zero electric current from after time point t1, corresponds to the time point that rectified input voltage Vin is higher than level L1.This
It is because rectified input voltage Vin is higher than after level L1, LED circuit 20 can just be connected (refering to Fig. 2A -2B).On the other hand,
In Fig. 9 A embodiments, the THD compensation circuits 130 in light emitting element driving circuit 200 receive builtin voltage Vint, are from time point
The semifocal chord wave of t1 to time point t2, and light-emitting component electric current ILED2 caused by light emitting element driving circuit 200, as shown in the figure
Also there are similar waveform profiles.Voltage and current waveform profiles in Fig. 9 A embodiments are increasingly similar, therefore compared to aforementioned
Other embodiments, Fig. 9 A embodiments improve with more preferably THD.In addition, the light-emitting component compared to one embodiment drives
The light emitting element driving circuit 200 of circuit 100, Fig. 9 A embodiments can save a pin.
Illustrate the present invention for preferred embodiment above, it is only described above, only make those skilled in the art easy
In understanding present disclosure, interest field not for the purpose of limiting the invention.Under the same spirit of the present invention, this field skill
Art personnel can think and various equivalence changes.For example, icon is directly connected in each embodiment two circuits or interelement, can plant
The other circuits or element of major function are not influenced；For another example, light-emitting component is not limited to light emitting diode shown in each embodiment
(LED), also can be the illuminating circuit of other forms；In another example can change can for NMOS elements, NMOS by PMOS shown in embodiment
It is PMOS elements to change, it is only necessary to processing mode of the corresponding modification circuit to signal.All this kind, according to the present invention can all teach
Analogize and obtain, therefore, the scope of the present invention should cover all equivalence changes of above and other.
Claims (18)
1. a kind of light emitting element driving circuit, to drive a light-emitting element circuit, the wherein light-emitting element circuit to have multiple
Concatenated light-emitting component, to receive a rectified input voltage, which is characterized in that the light emitting element driving circuit includes：
One switch module, including multiple switch and an ON-OFF control circuit, wherein multiple switch shines with corresponding this respectively
Element couples, and the ON-OFF control circuit is coupled with multiple switch, according to the rectified input voltage, to determine the hair of conducting
Optical element；
One current source circuit is coupled with the switch module, according to an adjustment signal, to provide a light-emitting component electric current and give conducting
Light-emitting component, wherein at least partly the time has close to the rectified input voltage light-emitting component electric current maximum in a period
Waveform profiles and there is substantially identical phase angle, also, the current peak of the light-emitting component electric current with the rectified input voltage
Value or maximum not because the amplitude of the rectified input voltage difference due to significant changes；And
One total harmonic distortion THD compensation circuits, including：
One adaptability multiplier circuit to according to the rectified input voltage, and generates an input voltage weighted sampling signal, should
The value of input voltage weighted sampling signal is relevant to the peak value of the rectified input voltage；And
One THD control circuits are coupled with the adaptability multiplier circuit, to according to the input voltage weighted sampling signal, production
Raw adjustment signal, to determine the light-emitting component electric current；
Wherein the adaptability multiplier circuit makes have direct ratio between the input voltage weighted sampling signal and the rectified input voltage
Relationship, and the proportionality coefficient of the direct ratio is relevant to the peak value of the rectified input voltage.
2. light emitting element driving circuit as described in claim 1, wherein, should when the amplitude difference of the rectified input voltage
The current peak or maximum of light-emitting component electric current are maintained fixed value.
3. light emitting element driving circuit as described in claim 1, wherein the THD compensation circuits further include electric current setting electricity
Road is coupled with the THD control circuits, and to provide an electric current setting signal, and the THD control circuits also set electricity with the electric current
Road couples, and according to the input voltage weighted sampling signal and the electric current setting signal, generates the adjustment signal.
4. light emitting element driving circuit as described in claim 1, wherein the adjustment signal has real with the rectified input voltage
The identical phase angle of matter.
5. light emitting element driving circuit as described in claim 1, wherein when the amplitude of the rectified input voltage is relatively large
When, the coefficient is relatively low；When the amplitude of the rectified input voltage is relatively small, the coefficient is relatively high, being consequently adapted to property
Ground adjust input voltage weighted sampling signal so that under the rectified input voltage of various amplitude, obtain it is substantially identical or
Close input voltage weighted sampling signal.
6. a kind of light emitting element driving circuit, to drive a light-emitting element circuit, the wherein light-emitting element circuit to have multiple
Concatenated light-emitting component, to receive a rectified input voltage, which is characterized in that the light emitting element driving circuit includes：
One switch module, including multiple switch and an ON-OFF control circuit, wherein multiple switch shines with corresponding this respectively
Element couples, and the ON-OFF control circuit is coupled with multiple switch, according to the rectified input voltage, to determine the hair of conducting
Optical element；
One current source circuit is coupled with the switch module, according to an adjustment signal, to provide a light-emitting component electric current and give conducting
Light-emitting component, wherein at least partly the time has close to the rectified input voltage light-emitting component electric current maximum in a period
Waveform profiles and there is substantially identical phase angle, also, the current peak of the light-emitting component electric current with the rectified input voltage
Value or maximum not because the amplitude of the rectified input voltage difference due to significant changes；And
One total harmonic distortion THD compensation circuits, including：
One adaptability multiplier circuit to according to the rectified input voltage, and generates an input voltage weighted sampling signal, should
The value of input voltage weighted sampling signal is relevant to the peak value of the rectified input voltage；And
One THD control circuits are coupled with the adaptability multiplier circuit, to according to the input voltage weighted sampling signal, production
Raw adjustment signal, to determine the light-emitting component electric current；
Wherein, which includes：
One input voltage sense circuit to sense the rectified input voltage, and generates input voltage partial pressure；
One peak value sensing circuit is coupled with the input voltage sense circuit, to sense the peak value of input voltage partial pressure, is generated
One peak value senses signal；
One multiplexer circuit is coupled with the peak value sensing circuit, to sense signal according to the peak value, generates an adjustment system
Number；And
One multiplier is coupled with the multiplexer circuit, according to input voltage partial pressure and the regulation coefficient, it is defeated to generate this
Enter voltage weighted sampling signal.
7. a kind of light emitting element driving circuit, to drive a light-emitting element circuit, the wherein light-emitting element circuit to have multiple
Concatenated light-emitting component, to receive a rectified input voltage, which is characterized in that the light emitting element driving circuit includes：
One switch module, including multiple switch and an ON-OFF control circuit, wherein multiple switch shines with corresponding this respectively
Element couples, and the ON-OFF control circuit is coupled with multiple switch, according to the rectified input voltage, to determine the hair of conducting
Optical element；
One current source circuit is coupled with the switch module, according to an adjustment signal, to provide a light-emitting component electric current and give conducting
Light-emitting component, wherein at least partly the time has close to the rectified input voltage light-emitting component electric current maximum in a period
Waveform profiles and there is substantially identical phase angle, also, the current peak of the light-emitting component electric current with the rectified input voltage
Value or maximum not because the amplitude of the rectified input voltage difference due to significant changes；And
One total harmonic distortion THD compensation circuits, including：
One adaptability multiplier circuit to according to the rectified input voltage, and generates an input voltage weighted sampling signal, should
The value of input voltage weighted sampling signal is relevant to the peak value of the rectified input voltage；And
One THD control circuits are coupled with the adaptability multiplier circuit, to according to the input voltage weighted sampling signal, production
Raw adjustment signal, to determine the light-emitting component electric current；
Wherein, which includes：
One input voltage sense circuit to receive the rectified input voltage, and according to a feedback signal, and generates input electricity
Press weighted sampling signal；
One comparison circuit is coupled with the input voltage sense circuit, to compare the input voltage weighted sampling signal and a ginseng
Signal is examined, a comparison result signal is generated；And
One counting circuit is coupled with the comparison circuit, according to the comparison result signal, to generate the feedback signal.
8. light emitting element driving circuit as described in claim 1, wherein the adaptability multiplier circuit further includes clamper electricity
Road to according to a default level, and limits a maximum value of the input voltage weighted sampling signal.
9. light emitting element driving circuit as described in claim 1, wherein the adaptability multiplier circuit is corresponding with one to shine
The backward end of element is connected without being directly connected to the rectified input voltage, to receive a builtin voltage.
10. a kind of driving method of light-emitting element circuit, the wherein light-emitting element circuit have multiple concatenated light-emitting components,
It is characterized in that, the driving method of the light-emitting element circuit includes：
One rectified input voltage is provided；
According to the rectified input voltage, to determine the light-emitting component of conducting；
According to the rectified input voltage, and an input voltage weighted sampling signal is generated, the input voltage weighted sampling signal
Value is relevant to the peak value of the rectified input voltage；
According to the input voltage weighted sampling signal, an adjustment signal is generated；And
According to the adjustment signal, the light-emitting component that a light-emitting component electric current gives conducting is provided, at least partly time in a period
With the waveform profiles close to the rectified input voltage and with the rectified input voltage with substantially identical phase angle, also,
The current peak or maximum of the light-emitting component electric current not because the amplitude of the rectified input voltage difference due to significant changes,
Wherein, the relationship with direct ratio between the input voltage weighted sampling signal and the rectified input voltage, and the ratio of the direct ratio
Example coefficient is relevant to the peak value of the rectified input voltage.
11. the driving method of light-emitting element circuit as claimed in claim 10, wherein when the rectified input voltage amplitude not
Meanwhile the current peak or maximum of the light-emitting component electric current are maintained fixed value.
12. the driving method of light-emitting element circuit as claimed in claim 10, wherein this is according to the input voltage weighted sampling
Signal, generate one adjustment signal the step of also include：According to the input voltage weighted sampling signal and an electric current setting signal, production
The raw adjustment signal, wherein the electric current setting signal are to the lower limit or the upper limit that determine the adjustment signal.
13. the driving method of light-emitting element circuit as claimed in claim 10, wherein the adjustment signal and rectification input electricity
Pressing element has a substantially identical phase angle.
14. the driving method of light-emitting element circuit as claimed in claim 10, wherein when the amplitude phase of the rectified input voltage
To it is larger when, the coefficient is relatively low；When the amplitude of the rectified input voltage is relatively small, the coefficient is relatively high, thus
Adaptively adjust input voltage weighted sampling signal so that under the rectified input voltage of various amplitude, obtain essence
Identical or close input voltage weighted sampling signal.
15. a kind of driving method of light-emitting element circuit, the wherein light-emitting element circuit have multiple concatenated light-emitting components,
It is characterized in that, the driving method of the light-emitting element circuit includes：
One rectified input voltage is provided；
According to the rectified input voltage, to determine the light-emitting component of conducting；
According to the rectified input voltage, and an input voltage weighted sampling signal is generated, the input voltage weighted sampling signal
Value is relevant to the peak value of the rectified input voltage；
According to the input voltage weighted sampling signal, an adjustment signal is generated；And
According to the adjustment signal, the light-emitting component that a light-emitting component electric current gives conducting is provided, at least partly time in a period
With the waveform profiles close to the rectified input voltage and with the rectified input voltage with substantially identical phase angle, also,
The current peak or maximum of the light-emitting component electric current not because the amplitude of the rectified input voltage difference due to significant changes；
Wherein, this is according to the rectified input voltage, and the step of generating the input voltage weighted sampling signal includes：
The rectified input voltage is received, and generates input voltage partial pressure；
It is divided according to the input voltage, generates a peak value and sense signal；
Signal is sensed according to the peak value, generates a regulation coefficient；And
According to input voltage partial pressure and the regulation coefficient, the input voltage weighted sampling signal is generated.
16. a kind of driving method of light-emitting element circuit, the wherein light-emitting element circuit have multiple concatenated light-emitting components,
It is characterized in that, the driving method of the light-emitting element circuit includes：
One rectified input voltage is provided；
According to the rectified input voltage, to determine the light-emitting component of conducting；
According to the rectified input voltage, and an input voltage weighted sampling signal is generated, the input voltage weighted sampling signal
Value is relevant to the peak value of the rectified input voltage；
According to the input voltage weighted sampling signal, an adjustment signal is generated；And
According to the adjustment signal, the light-emitting component that a light-emitting component electric current gives conducting is provided, at least partly time in a period
With the waveform profiles close to the rectified input voltage and with the rectified input voltage with substantially identical phase angle, also,
The current peak or maximum of the light-emitting component electric current not because the amplitude of the rectified input voltage difference due to significant changes；
Wherein, this is according to the rectified input voltage, and the step of generating the input voltage weighted sampling signal includes：
The rectified input voltage is received, and according to a feedback signal, and generates the input voltage weighted sampling signal；
Compare the input voltage weighted sampling signal and a reference signal, generates a comparison result signal；And
According to the comparison result signal, the feedback signal is generated.
17. the driving method of light-emitting element circuit as claimed in claim 10, wherein this according to the rectified input voltage, and
The step of generating the input voltage weighted sampling signal further include：According to a default level, and limits input voltage weighting and take
One maximum value of sample signal.
18. the driving method of light-emitting element circuit as claimed in claim 10, wherein this according to the rectified input voltage, and
The step of generating the input voltage weighted sampling signal include：
From the backward end of a light-emitting component builtin voltage, the forward end of the light-emitting component are obtained from the rectified input voltage indirectly
It is coupled to the rectified input voltage；And
According to the builtin voltage, and generate the input voltage weighted sampling signal.
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| CN102781137A (en) * | 2011-05-10 | 2012-11-14 | 立锜科技股份有限公司 | Light emitting device current regulator circuit and control method thereof |
| CN103945598A (en) * | 2013-01-22 | 2014-07-23 | 立锜科技股份有限公司 | Light emitting device power supply circuit, light emitting device control circuit and identification method thereof |
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| CN103369762B (en) * | 2012-03-29 | 2015-06-17 | 钰瀚科技股份有限公司 | Driving method of lighting equipment based on light emitting diode and device thereof |
| US8803445B2 (en) * | 2012-09-07 | 2014-08-12 | Infineon Technologies Austria Ag | Circuit and method for driving LEDs |
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| CN102781137A (en) * | 2011-05-10 | 2012-11-14 | 立锜科技股份有限公司 | Light emitting device current regulator circuit and control method thereof |
| CN103945598A (en) * | 2013-01-22 | 2014-07-23 | 立锜科技股份有限公司 | Light emitting device power supply circuit, light emitting device control circuit and identification method thereof |
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