CN105530720A - Driving device and method thereof - Google Patents
Driving device and method thereof Download PDFInfo
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- CN105530720A CN105530720A CN201510673836.2A CN201510673836A CN105530720A CN 105530720 A CN105530720 A CN 105530720A CN 201510673836 A CN201510673836 A CN 201510673836A CN 105530720 A CN105530720 A CN 105530720A
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- signal
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a driving method and a driving device applying the same. The method comprises following steps of generating a selection signal according to a power supply output by an audion flow switch; generating a voltage stabilizing signal via a linear voltage stabilizer; generating a modulating signal via a pulse width modulator; and selecting one of the voltage stabilizing signal and the modulating signal to control output current of a triode loop according to the selection signal, wherein a light emitting diode loop is coupled to the audion flow switch.
Description
Technical field
The present invention, about a kind of drive unit and method thereof, is applicable to especially in regard to a kind of with the drive unit of the LED circuit of triode stream switch drive and method thereof.
Background technology
Light-emitting diode (lightemittingdiode, LED) is widely used in daily life as a kind of light-emitting component of high-luminous-efficiency.The circuit of LED being wherein directly suitable for AC power (alternatingcurrentpower, ACpower) is widely used especially.Generally for the luminous intensity of stabilized illumination diode circuit, pulse width modulation (pulse-widthmodulation) technology can be used to arrange in pairs or groups specific passive electronic component, make the electric current flowing through light-emitting diode roughly stable.
On the other hand, in the field of illumination, light adjusting circuit (dimmingcircuit) because can be used for regulating the luminous intensity of light-emitting component, and is used to build special atmosphere in various specific environment.In traditional light adjusting circuit, triode stream switch (triodeforalternatingcurrent, TRIAC) is a kind of common element.
But, when circuit of LED carrys out stabilized illumination intensity with pulse width modulating technology simultaneously, and during using triode stream switch as brightness regulation element, have the problem of flicker.Its problem is, triode stream switch is after igniting (conducting), if its output current is less than one maintain electric current (holdingcurrent), then triode stream switch can stop start, and when must wait until that the voltage/current of input power is next time enough high, triode stream switch just can be lighted a fire again.And pulse width modulating technology and triode stream switch are when being applied in circuit of LED simultaneously, pulse width modulating technology may make the output current of triode stream switch too small.So, triode stream switch will be lighted a fire always repeatedly again, and makes the electric current in fact flowing through light-emitting diode unstable, produces the problem of flicker (flash).
Summary of the invention
Due to pulse width modulating technology and triode stream switch be applied in circuit of LED simultaneously time, pulse width modulating technology may make the output current of triode stream switch too small.Thus triode stream switch will be lighted a fire repeatedly more always, and make the electric current in fact flowing through light-emitting diode unstable, produce the problem of flicker (flash).In order to solve this problem, the present invention proposes a kind of new drive unit, when the electric current of triode stream switch drops to a certain degree, does not use pulse width modulation to carry out the electric current of stabilized illumination diode.The substitute is the electric current using linear voltage-stabilizing apparatus to carry out stabilized illumination diode.So, the electric current exported from triode stream switch can be limited in maintaining more than electric current, therefore avoids triode stream switch and lights a fire repeatedly again, finally solve the problem of flicker.
According to a kind of drive unit of the one or more embodiment of the present invention, there is current control module, linear voltage regulator, pulse-width modulator, selection module and multiplex module.Current control module is coupled to a LED circuit, and in order to the output current controlling to provide LED circuit according to control signal, and produce feedback signal according to output current, wherein LED circuit is coupled to a triode stream switch.Linear voltage regulator couples current control module, and the power supply exported in order to foundation triode stream switch and feedback signal, produce voltage regulation signal.Pulse-width modulator couples current control module, in order to produce modulation signal according to feedback signal and reference voltage.Select module in order to the power supply exported according to triode stream switch, produce and select signal.Multiplex module couples respectively selects module, linear voltage regulator and pulse-width modulator, in order to according to selecting signal, select voltage regulation signal and modulation signal one of them as control signal.
And a kind of driving method of the one or more embodiment of foundation the present invention, comprise the following step: the power supply exported according to triode stream switch, produce and select signal.Voltage regulation signal is produced with linear voltage regulator.Modulation signal is produced with pulse-width modulator.According to selecting signal, one of them controls the output current being supplied to LED circuit to select voltage regulation signal and modulation signal, and wherein LED circuit is coupled to triode stream switch.
Driving method disclosed in the one or more embodiment of the present invention and its device, according to the power supply that triode stream switch exports, carry out the electric current optionally controlling to be supplied to LED circuit in the mode of pulse width modulation (pulse-widthmodulation) or linear voltage stabilization (low-dropout), thus the electric current avoiding triode stream switch to export is less than and maintains electric current and start raw ignition problem more repeatedly.
The above explanation about content of the present invention and the explanation of following execution mode in order to demonstration and explanation spirit of the present invention and principle, and provide patent application claims protection range of the present invention further to explain.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of LED circuit of drive unit for driving with triode stream switch (triodeforalternatingcurrent, TRIAC) according to one embodiment of the invention.
Fig. 2 A is the circuit diagram of the current control module according to one embodiment of the invention.
Fig. 2 B is the current diagram of the current control module according to another embodiment of the present invention.
Fig. 3 be according in one embodiment of the invention with the voltage regulation signal of linear voltage regulator to control the circuit diagram of current control module.
Fig. 4 A is the functional block diagram according to the pulse-width modulator in one embodiment of the invention.
Fig. 4 B is the sequential chart corresponding to each signal in Fig. 4 A.
Fig. 5 A is the selection modular circuit schematic diagram according to one embodiment of the invention.
Fig. 5 B is the selection modular circuit schematic diagram according to another embodiment of the present invention.
Fig. 5 C is the selection functions of modules calcspar according to yet another embodiment of the invention.
Fig. 6 is according to the multiplex module circuit diagram in one embodiment of the invention.
Fig. 7 is the signal timing diagram corresponding to Fig. 1.
Fig. 8 is the driving method flow chart according to one embodiment of the invention.
Wherein, Reference numeral:
100 drive units
110 current control module
111 switch elements
111a first end
111b second end
111c control end
113 current/voltage converting units
113a first impedance component
113b second impedance component
120 linear voltage regulators
121 amplifiers
130 pulse-width modulators
131 comparators
133 clock pulse generators
135S-R fastens lock device
137 buffers
140 select module
141 comparators
143 amplifiers
145 analog-digital converters
147 digital signal processing units
150 multiplex module
151,153 channel units
200 triode stream switches
300 LED circuits
301 first ends
302 second ends
310 light emitting diode matrixs
311 first ends
312 second ends
320 electric capacity
321 first ends
322 second ends
330 inductance
331 first ends
332 second ends
340 diodes
341 first ends
342 second ends
I
ooutput current
I
iNcurrent value
I
tHthreshold value
P
0power supply
P1, P2 time interval
R resistance
SEL selects signal
T
1~ T
3time point
V
ccontrol signal
V
cLKclock signal
V
cOMPcomparison signal
V
ffeedback signal
V
lATCHlatch-up signal
V
lDOvoltage regulation signal
V
pWMmodulation signal
V
rEF1, V
rEF2reference voltage
V
tHthreshold voltage
Embodiment
Below detailed features of the present invention and advantage is described in embodiments in detail; its content is enough to make any those skilled in the art understand technology contents of the present invention and implement according to this; and according to the content disclosed in this specification, claims and accompanying drawing, any those skilled in the art can understand the object and advantage that the present invention is correlated with easily.Following embodiment further describes viewpoint of the present invention, but non-to limit category of the present invention anyways.
About a kind of drive unit according to one embodiment of the invention, please refer to Fig. 1, it is the system architecture schematic diagram being used for the LED circuit driven with triode stream switch (triodeforalternatingcurrent, TRIAC) according to the drive unit of one embodiment of the invention.As shown in Figure 1, the drive unit 100 realized according to one embodiment of the invention is coupled to triode stream switch 200 and LED circuit 300, and LED circuit 300 and triode stream switch 200 are coupled to each other.Drive unit 100 has current control module 110, linear voltage regulator 120, pulse-width modulator 130, selects module 140 and multiplex module 150.Wherein current control module 110 is coupled to LED circuit 300, linear voltage regulator 120 couples current control module 110, pulse-width modulator 130 couples current control module 110, select module 140 to couple triode stream switch 200, multiplex module 150 couples respectively selects module 140, linear voltage regulator 120 and pulse-width modulator 130.
And described LED circuit 300 has first end 301 and the second end 302, wherein first end 301 couples triode stream switch 200, and the second end 302 couples current control module 110.Light emitting diode matrix 310, electric capacity 320, inductance 330 and diode 340 is had in light-emitting diode.As shown in Figure 1, the first end 311 of the light emitting diode matrix 310 in the present embodiment, the first end 321 of electric capacity 320 and the first end 341 of diode 340 all couple the first end 301 of LED circuit 300.Second end 312 and second end 322 of electric capacity 320 of light emitting diode matrix 310 all couple the first end 331 of inductance 330.Second end 332 and second end 342 of diode 340 of inductance 330 all couple the second end 302 of LED circuit 300.
Current control module 110 is in order to foundation control signal V
ccontrol the output current I that LED circuit 300 is provided
o, and according to output current I
oproduce feedback signal V
f.In an execution mode, please refer to Fig. 2 A and Fig. 2 B, wherein Fig. 2 A is the circuit diagram of the current control module according to one embodiment of the invention, and Fig. 2 B is the current diagram of the current control module according to another embodiment of the present invention.As shown in Figure 2 A, switch element 111 and current/voltage converting unit 113 is had in current control module 110, it wherein current/voltage converting unit 113 implementation is the element of the poor electric current one_to_one corresponding (one-to-oneandonto) with flowing through of a resistance or other both end voltage, that is current/voltage converting unit 113 is flow through relative to, the feedback voltage V that current/voltage converting unit 113 provides
fthe relation of strictly increasing or strictly decreasing each other.
And switch element 111 has first end 111a, the second end 111b and control end 111c, wherein control end 111c is coupled to multiplex module 150.Thus between the first end 111a of switch element 111 and the second end 111b, whether form the control signal V that power channel (electricpath) can be sent by multiplex module 150
cdecide.And first end 111a is coupled to LED circuit 300, and the two ends of current/voltage converting unit 113 are respectively coupled to the second end 111b and Voltage Reference end (for example can be the earth terminal of whole system framework or the earth terminal of current control module 110 itself).In the present embodiment, feedback signal V
fresult from the second end 111b of switch element 111.
In the embodiment of Fig. 2 A, switch element 111 is N-type metal oxide semiconductcor field effect transistor (N-typemetal-oxidesemiconductorfieldeffecttransistor, N-MOSFET), npn bipolar transistor (npnbipolarjunctiontransistor, npnBJT) or other there is the element of similar characteristics.So, as control signal V
cvoltage level when being high voltage, switch element 111 conducting, thus make to form power channel between first end 111a and the second end 111b.And as control signal V
cvoltage level when being low-voltage, switch element 111 not conducting, thus make not form power channel between first end 111a and the second end 111b.
In another embodiment, as shown in Figure 2 B, the first impedance component 113a and the second impedance component 113b of serial connection is had in current/voltage converting unit 113.That is, compared to the embodiment of Fig. 2 A, the feedback signal V of Fig. 2 B
fnot result from the second end 111b of switch element 111, but result from the first impedance component 113a and the second impedance component 113b connection.In an embodiment, circuit designers, via suitably selecting the first impedance component 113a and second group of anti-element 113b, adjusts feedback signal V
fwith output current I
obetween relation.
The power supply P of linear voltage regulator 120 in order to export according to triode stream switch 200
0and feedback signal V
fproduce voltage regulation signal V
lDO.Please refer to Fig. 3, it is the circuit diagram according to controlling current control module in one embodiment of the invention with the voltage regulation signal of linear voltage regulator.As shown in Figure 3, in an embodiment, have an amplifier 121 in linear voltage regulator 120, its positive input terminal is used for reception reference voltage V
rEF1, its negative input end is used for receiving feedback signals V
f, and its output is used for exporting voltage regulation signal V
lDO, wherein as voltage regulation signal V
lDOcontrol signal V is used as aftermentioned
ctime, because the imaginary short of amplifier 121 (virtualshort) characteristic, make feedback signal V
fvoltage level equal in fact reference voltage V
rEF1.So, the output current I of LED circuit 300 is supplied to by current control module 110
owith regard to referenced voltage V
rEF1determined with current/voltage modular converter 113.
Pulse-width modulator 130 is in order to foundation feedback signal V
fwith reference voltage V
rEF2produce modulation signal V
pWM.Specifically, please refer to Fig. 4 A and Fig. 4 B, wherein Fig. 4 A is the functional block diagram according to the pulse-width modulator in one embodiment of the invention, and Fig. 4 B is the sequential chart corresponding to each signal in Fig. 4 A.As shown in Figure 4 A, the pulse-width modulator 130 in one embodiment of the invention has comparator 131, clock pulse generator 133, S-R latch unit 135 (set-resetlatch, SRlatch) and buffer 137.Wherein the positive input terminal of comparator 131 is used for receiving feedback signals V
f, negative input end is used for reception reference voltage V
rEF2, as feedback signal V
fvoltage level be greater than in fact reference voltage V
rEF2time, the comparison signal V that the output of comparator 131 exports
cOMPvoltage level be high voltage, otherwise be then low-voltage.Clock pulse generator 133 is used for producing clock signal V
cLK.The setting end (Sterminal) of S-R latch unit 135 is used for receiving clock signal V
cLK, and its replacement end (Rterminal) is used for receiving comparison signal V
cOMP, and the latch-up signal V that the output of latch unit 135 (Qterminal) exports
lATCHin accordance with the rule of lower list 1.And the input of buffer 137 is coupled to the output of latch unit 135, be used for receiving latch-up signal V
lATCH, the output of buffer 137 is used for exporting modulation signal V
pWM, in this embodiment, modulation signal V
pWMessence equals latch-up signal V
lATCH.
Table 1
| Setting terminal voltage position is accurate | Reset terminal voltage position accurate | Latch-up signal voltage level |
| Low | Low | Do not change |
| Low | High | Low |
| High | Low | High |
| High | High | Undefined (should not occur) |
Then, please with reference to Fig. 4 A and Fig. 4 B, wherein in the embodiment of Fig. 4 B, corresponding to Fig. 4 A, modulation signal V
pWMbe used as control signal V
cto control output current I
o.As shown in Figure 4 B, in very first time point T
1in the past, feedback signal V
fvoltage level be less than reference voltage V
rEF2, therefore comparison signal V
cOMPvoltage level be low-voltage, and clock signal V
cLKvoltage level be low-voltage, if if now latch-up signal V
lATCH, modulation signal V
pWMwith control signal V
cvoltage level be high voltage, switch element therefore in current control module 110 111 is switched on.Then at very first time point T
1, output current I
oenough large, cause feedback signal V
fvoltage level higher than reference voltage V
rEF, the comparison signal V of therefore comparator 131 output
cOMPvoltage level change high voltage into.And clock signal V
cLKvoltage level be low-voltage, therefore latch-up signal V
lATCHwith modulation signal V
pWMall change low-voltage into.Thus make control signal V
calso be pulled to low-voltage, and switch element 111 closedown is made it not conducting.Thus, feedback signal V is made
fvoltage level be down to low-voltage, and make comparison signal V
cOMPvoltage level be also down to low-voltage.Now, due to clock signal V
cLKvoltage level also in low-voltage, therefore latch-up signal V
lATCH, modulation signal V
pWMwith control signal V
cvoltage level all also in low-voltage.
Then, at the second time point T
2time, clock signal V
cLKvoltage level rise to high voltage, thus make latch-up signal V
lATCH, modulation signal V
pWMwith control signal V
cvoltage level be all and then promoted to high voltage.So, switch element 111 is switched on, and makes output current I
oagain be provided to LED circuit 300.By the time the 3rd time point T
3, due to output current I
oenough large, cause feedback signal V
fvoltage level higher than reference voltage V
rEF, the comparison signal V of therefore comparator 131 output
cOMPvoltage level change high voltage into.And clock signal V
cLKvoltage level be low-voltage, therefore latch-up signal V
lATCHwith modulation signal V
pWMall change low-voltage into.Thus make control signal V
calso be pulled to low-voltage, and switch element 111 closedown is made it not conducting.Thus, feedback signal V is made
fvoltage level be down to low-voltage, and make comparison signal V
cOMPvoltage level be also down to low-voltage.Now, due to clock signal V
cLKvoltage level also in low-voltage, therefore latch-up signal V
lATCH, modulation signal V
pWMwith control signal V
cvoltage level all also in low-voltage.That is, pulse-width modulator 130 by control switch unit 111 conducting whether, make in one section of sufficiently long time interval, output current I
omean value be substantially equal to default current value, the energy that LED circuit 300 so can be made to consume in this time interval roughly meets expection.
Select the power supply P of module 140 in order to export according to triode stream switch 200
0produce and select signal SEL.Specifically, please refer to Fig. 5 A and Fig. 5 B, wherein Fig. 5 A is the selection modular circuit schematic diagram according to one embodiment of the invention, and Fig. 5 B is the selection modular circuit schematic diagram according to another embodiment of the present invention.As shown in Figure 5A, the selection module 140 in an embodiment has a comparator 141, and the positive input terminal of comparator 141 is used for reception threshold voltage V
tH, and the negative input end of comparator 141 is used for receiving the power supply P that triode stream switch 200 exports
0, comparator 141 compares threshold voltage V
tHwith power supply P
0voltage level, select signal SEL to produce in output.As power supply P
0voltage level lower than threshold voltage V
tHtime, the voltage level selecting signal SEL is high voltage, otherwise is then low-voltage.Conceptive, namely according to power supply P
0voltage level estimate its current value, thus by this current value with threshold voltage V
tHcorresponding current value ratio comparatively produces selects signal SEL.Threshold voltage V in this embodiment
tHcorresponding current value (threshold value), is greater than maintenance electric current (holdingcurrent, the I of triode stream switch 200
h).For example, threshold voltage V
tHcorresponding current value (threshold value) is maintenance electric current (holdingcurrent, the I of triode stream switch 200
h) twice.
In addition, in another embodiment, as shown in Figure 5 B, the power supply P of triode stream switch 200 output
0before being transported to LED circuit 300, flow through a resistance R, and the voltage difference at the two ends of resistance R is exaggerated device 143 reads and amplify, and is brought and threshold voltage V by comparator 141
tHcompare, and produce selection signal SEL.Its mode roughly, as described in Fig. 5 A, repeats no more in this.
In addition, in other embodiments, please refer to Fig. 5 C, it is the selection functions of modules calcspar according to yet another embodiment of the invention.As shown in Figure 5 C, module 140 is selected to have analog-digital converter 145 (analog-to-digitalconverter, ADC) and digital signal processing unit 147 (digitalsignalprocessingunit, DSP).Analog-digital converter 145 is by power supply P
0voltage and/or current conversion become digital signal, and digital signal processing unit 147 is according to this digital signal interpretation triode stream switch 200 out-put supply P
0phase characteristic, and export according to this phase characteristic and select signal SEL.
Multiplex module 150, in order to according to selecting signal SEL, selects voltage regulation signal V
lDOwith modulation signal V
pWMone of them is as control signal V
c.In an embodiment, please refer to Fig. 6, it is according to the multiplex module circuit diagram in one embodiment of the invention.As shown in Figure 6, multiplex module 150 is simulation multiplexers, have channel unit 151 and channel unit 153, wherein channel unit 151 couples linear voltage regulator 120 and switch element 111 respectively, and channel unit 153 couples pulse-width modulator 130 and switch element 111 respectively.According to selecting signal SEL, channel unit 151 and channel unit 153 are put at any time only has at most one of them to be switched on, thus makes voltage regulation signal V
lDOwith modulation signal V
pWMone of them is used as control signal V
c.Specifically, the embodiment of collocation Fig. 5 A, when the voltage level selecting signal SEL is high-tension time, multiplex module 150 is selected with voltage regulation signal V
lDOas control signal V
c.And when the voltage level selecting signal SEL is low-voltage time, multiplex module 150 is selected with modulation signal V
pWMas control signal V
c.
Therefore, generally speaking, please with reference to Fig. 1 and Fig. 7, wherein Fig. 7 is the signal timing diagram corresponding to Fig. 1.As shown in Figure 7, in the very first time interval P1, module 140 is selected to judge power supply P
0current value I
iNbe greater than threshold value I
tH, therefore with modulation signal V
pWMas control signal V
c.And terminate in the very first time interval P1, when entering the second time interval P2, select module 140 to judge power supply P
0current value I
iNbe less than threshold value I
tH, therefore with voltage regulation signal V
lDOas control signal V
c.Owing to working as current value I
iNbe less than threshold value I
tHtime just with voltage regulation signal V
lDOas control signal, now current value I
iNstill be greater than the maintenance electric current of triode stream switch 200, and linear voltage regulator 120 is after suitably designing, output current I
oalso can be greater than the maintenance electric current of triode stream switch 200, therefore at the very first time interval P1 and the second time interval P2, the problem that triode stream switch 200 needs to light a fire again all can not occur.
Therefore, the drive unit of aforementioned one or more embodiment can be summarized as a kind of driving method as flowing mode, please refer to Fig. 8, it is the driving method flow chart according to one embodiment of the invention.As shown in Figure 8, the driving method realized according to one embodiment of the invention comprises the following step: as described in step S810, and the power supply exported according to triode stream switch, produces and select signal.As described in step S830, according to selecting signal, selection gist feedback signal produces voltage regulation signal or produces modulation signal according to this feedback signal, and by produced voltage regulation signal or feedback signal as control signal.As described in step S850, according to control signal, control the output current being supplied to LED circuit.
According to drive unit and its method of one embodiment of the invention, be applicable to the LED circuit of triode stream switch drive.When the electric current judging that triode stream switch exports is less than threshold value, select to carry out the electric current of control flow check through LED circuit in the mode of linear voltage stabilization, and when the electric current judging that triode stream switch exports is more than or equal to threshold value, select to carry out the electric current of control flow check through LED circuit in the mode of pulse width modulation.So, reduce triode stream switch and pulse width modulation is applied to when driving LED circuit simultaneously, triode stream switch needs the probability repeating to light a fire again, thus the problem of the flicker avoiding LED circuit to produce because triode stream switch is lighted a fire again.
Claims (18)
1. a drive unit, is characterized in that, comprises:
One current control module, couple a LED circuit, in order to foundation one control signal optionally to the output current that this LED circuit provides, and produce a feedback signal according to this output current, wherein this LED circuit is coupled to a triode stream switch;
One linear voltage regulator, couples this current control module, in order to the power supply that exports according to this triode stream switch and this feedback signal, produces a voltage regulation signal;
One pulse-width modulator, couples this current control module, in order to according to this feedback signal and a reference voltage, produces a modulation signal;
One selects module, in order to the power supply exported according to this triode stream switch, produces one and selects signal; And
One multiplex module, couples this selection module, this linear voltage regulator and this pulse-width modulator respectively, in order to according to this selection signal, select this voltage regulation signal and this modulation signal one of them as this control signal.
2. drive unit as claimed in claim 1, it is characterized in that, this current control module comprises:
One switch element, there is a first end, one second end and a control end, this first end is coupled to this LED circuit, this control end is coupled to this multiplex module, in order to determine that according to this control signal whether forming a power channel between this first end and this second end allows this output current pass through; And
One current/voltage converting unit, is electrically connected to this second end and ground connection of this switch element respectively, produces this feedback signal in order to foundation by this output current of this switch element.
3. drive unit as claimed in claim 1, is characterized in that, a phase characteristic of the power supply that this selection module exports according to this triode stream switch, produces this corresponding selection signal.
4. drive unit as claimed in claim 1, is characterized in that, a magnitude of voltage of the power supply that this selection module exports according to this triode stream switch, produces this corresponding selection signal.
5. drive unit as claimed in claim 4, is characterized in that, this selection module obtains a current value of the power supply that this triode stream switch exports according to this magnitude of voltage, to produce this corresponding selection signal.
6. drive unit as claimed in claim 1, is characterized in that, a current value of the power supply that this selection module exports according to this triode stream switch, produces this corresponding selection signal.
7. the drive unit as described in claim 5 or the 6th, is characterized in that, this selection module, according to this current value and a threshold value, produces this corresponding selection signal, and wherein this threshold value is associated with one of this triode stream switch and maintains electric current.
8. drive unit as claimed in claim 7, it is characterized in that, when this current value essence is greater than this threshold value, this this multiplex module of selection signal controlling selects this modulation signal as this control signal.
9. drive unit as claimed in claim 7, it is characterized in that, when this current value essence is less than this threshold value, this this multiplex module of selection signal controlling selects this voltage regulation signal as this control signal.
10. a driving method, is characterized in that, comprises:
According to the power supply that a triode stream switch exports, produce one and select signal;
According to this selection signal, selection gist one feedback signal produces a voltage regulation signal or produces a modulation signal according to this feedback signal, and by this produced voltage regulation signal or this feedback signal as a control signal; And
According to this control signal, be optionally supplied to an output current of a LED circuit;
Wherein this LED circuit is coupled to this triode stream switch, and this feedback signal is associated with this output current.
11. methods as claimed in claim 10, it is characterized in that, in the step producing this voltage regulation signal, produce this voltage regulation signal according to this feedback signal and this power supply, and produce this modulation signal according to this feedback signal and a reference voltage in the step producing this modulation signal.
12. methods as claimed in claim 10, is characterized in that, according to a phase characteristic of this power supply, produce this selection signal.
13. methods as claimed in claim 10, it is characterized in that, the magnitude of voltage according to this power supply produces this selection signal.
14. methods as claimed in claim 13, is characterized in that, obtain a current value of this power supply according to this magnitude of voltage, and produce this selection signal according to this current value.
15. methods as claimed in claim 10, it is characterized in that, the current value according to this power supply produces this selection signal.
16. methods as described in claim 14 or the 15th, it is characterized in that, produce this selection signal according to this current value and a threshold value, this threshold value is associated with one of this triode stream switch and maintains electric current.
17. methods as claimed in claim 16, it is characterized in that, according to this selection signal, select this voltage regulation signal and this modulation signal one of them in the step controlling this output current, when this current value essence is greater than this threshold value, select to control this output current with this modulation signal.
18. methods as claimed in claim 16, it is characterized in that, according to this selection signal, select this voltage regulation signal and this modulation signal one of them in the step controlling this output current, when this current value essence is less than this threshold value, select to control this output current with this voltage regulation signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201462065255P | 2014-10-17 | 2014-10-17 | |
| US62/065,255 | 2014-10-17 |
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|---|---|
| CN105530720A true CN105530720A (en) | 2016-04-27 |
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|---|---|---|---|
| CN201510673836.2A Pending CN105530720A (en) | 2014-10-17 | 2015-10-16 | Driving device and method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061037A (en) * | 2016-07-19 | 2016-10-26 | 湖州绿明微电子有限公司 | LED driving circuit with power factor correction and driver |
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