CN105792439A - Led drive circuit - Google Patents
Led drive circuit Download PDFInfo
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- CN105792439A CN105792439A CN201610264785.2A CN201610264785A CN105792439A CN 105792439 A CN105792439 A CN 105792439A CN 201610264785 A CN201610264785 A CN 201610264785A CN 105792439 A CN105792439 A CN 105792439A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The present invention provides an LED drive circuit. The LED drive circuit comprises a rectifying circuit, a driving current generation circuit, a bus voltage detection circuit, an LED structure control circuit and an LED array. The LED drive circuit provided by the present invention enables the LED array in the prior art to be changed on the basis of reducing the energy consumption or realizing a high power factor (PF) value, can adjust the utilization rate of each LED by switching the switches, and enables the utilization rates of the LEDs in the LED array to be more uniform, thereby increasing the service life of the LED drive circuit.
Description
The application is application number is 201310460841.6, and the applying date is on 09 29th, 2013, and denomination of invention is the divisional application of " LED drive circuit ".
Technical field
The present invention relates to a kind of drive circuit, particularly relate to a kind of LED drive circuit.
Background technology
In order to meet relevant harmonic standard, value must in prescribed limit for the PF (PowerFactor is called for short power factor) of AC-DCLED driver (AC-DC LED drive).Tradition AC-DCLED driver is divided into single stage type AC-DCLED driver and two-stage type AC-DCLED driver.Single stage type AC-DCLED driver, by parameter reasonable in design, it is possible to achieve high PF value, but control variable is limited, it is unfavorable for optimizing the efficiency of LED driver and it is necessary to use electrochemical capacitor, this have impact on the service life of LED driver, the problem that simultaneously would be likely to occur visual stroboscopic.Two-stage type AC-DCLED driver, it is possible to take entire variable control, it is achieved high PF value, and be conducive to optimizing the efficiency of LED driver, and can realize without visual stroboscopic.Owing to the input of LED driver is the power of a pulsation, and exporting is a straight power, it is necessary to the storage capacitor on intermediate bus bar balances the two power, if this storage capacitor adopts electrochemical capacitor, then have impact on the service life of LED driver；If this storage capacitor adopts pottery or thin-film capacitor, then intermediate-bus voltage may be made to be limited to the voltage stress scope of electric capacity, or meet voltage stress scope, but the chip area that electric capacity takies is big, adds the cost of LED driver.
At present, also having a kind of AC-DCLED driver based on multistage busbar voltage, this driver can control to realize no electrolytic capacitor by power discreteization, improves the service life of LED driver, and the problem being absent from visual stroboscopic.SSC proposes order multi-stage LED (light emitting diode) lamp string structure control strategy, the basic structure of LED string is as shown in Figure 1, the advantage of this mode of operation is in that to control simply, the problem that any one LED is absent from visual stroboscopic, but LED utilization rate is unbalanced, such as when switching Sa conducting, LEDLa is always luminous；When switching Sb conducting, LEDLa and Lb is always luminous；When switching Sa, Sb and turning off, LEDLa, Lb and Lc are always luminous, it is known that the utilization rate of LEDLa is significantly high, and the utilization rate of LEDLb, Lc is relatively low, and this may affect the service life of whole system.Therefore, the structural design of load LED unreasonable, can cause that LED utilization rate is not high or unbalanced, thus affecting the service life of whole system.
Summary of the invention
The present invention provides a kind of LED drive circuit, with reduce energy consumption or realize high PF value basis on, equilibrium utilizes LED, the service life of increase LED drive circuit.
For reaching above-mentioned purpose, the present invention provides a kind of LED drive circuit, and it includes rectification circuit, drives current generating circuit, busbar voltage testing circuit, LED structure control circuit and LED array,
The input incoming transport voltage of described rectification circuit, after described ac voltage rectifier, outfan output DC voltage；
The input of described driving current generating circuit receives described DC voltage, outfan output driving current, and described driving electric current drives the work of described LED array；
Described busbar voltage testing circuit is for detecting the busbar voltage in described driving current generating circuit, and outfan exports the size of described busbar voltage；
Described LED structure control circuit controls turning on and off of each LED in described LED array according to the size of described busbar voltage；
Described LED array include some LED being connected in series and with one or more switches in parallel for described LED, described LED structure control circuit control described in switch on-off.
The present invention also provides for the driving method of a kind of described LED drive circuit, and described method includes:
Step one: after described rectification circuit is inputted the ac voltage rectifier of end, its outfan exports DC voltage to described driving current generating circuit；
Step 2: described DC voltage is converted to drive the driving electric current of LED array by described driving current generating circuit；
Step 3: described busbar voltage testing circuit detects the busbar voltage in described driving current generating circuit, its outfan exports described busbar voltage to described LED structure control circuit；
Step 4: described LED structure control circuit controls turning on and off of each LED in described LED array according to the size of described busbar voltage；And
Step 5: described driving current generating circuit regulates the driving electric current of its output according to the number of opening of described LED, to reduce energy consumption or to improve the power factor of described LED drive circuit.
Further, described driving current generating circuit median generatrix voltage and driving electric current are respectively divided into multiple grades of correspondence.
Further, the electric current that drives of described driving current generating circuit output can be adjusted according to the actual working state of LED each in described LED array,
When the grade of described busbar voltage of described busbar voltage testing circuit detection is gradually lowered, described in the LED that is connected in series gradually decrease it and open number, regulate described driving electric current and increase so that the output of described LED drive circuit is firm power,
Or, regulate described driving electric current and reduce, so that described LED drive circuit has High Power Factor value；
When the grade of described busbar voltage of described busbar voltage testing circuit detection gradually steps up, described in the LED that is connected in series be gradually increased it and open number, regulate described driving electric current and reduce so that the output of described LED drive circuit is firm power,
Or, regulate described driving electric current and increase, so that described LED drive circuit has High Power Factor value.
Further, the electric current that drives of described driving current generating circuit output can be adjusted according to the actual working state of LED each in described LED array, when the output of described LED drive circuit is firm power,
When the described busbar voltage of described busbar voltage testing circuit detection is the first magnitude of voltage, the described LED being connected in series to open number minimum, described drive current adjustment is the first current value, and the maximum of described driving electric current not can exceed that the load current value of described LED；
When the described busbar voltage of described busbar voltage testing circuit detection is the second magnitude of voltage, described in the number of opening of LED that is connected in series open number minimum and open at most between number, described drive current adjustment is the second current value；
When the described busbar voltage of described busbar voltage testing circuit detection is third voltage value, described in be connected in series LED to open number maximum, described drive current adjustment is the 3rd current value.
Further, the electric current that drives of described driving current generating circuit output can be adjusted according to the actual working state of LED each in described LED array, when described LED drive circuit has High Power Factor value,
When the described busbar voltage of described busbar voltage testing circuit detection is the first magnitude of voltage, described in be connected in series LED to open number minimum, described drive current adjustment is the 3rd current value；
When the described busbar voltage of described busbar voltage testing circuit detection is the second magnitude of voltage, described in the number of opening of LED that is connected in series open number minimum and open at most between number, described drive current adjustment is the second current value；
When the described busbar voltage of described busbar voltage testing circuit detection is third voltage value, the described LED being connected in series to open number maximum, described drive current adjustment is the first current value, and the maximum of described driving electric current not can exceed that the load current value of described LED.
Further, described LED array is to be formed by connecting by multiple described switches and multiple described LED, multiple described LED are sequentially connected in series between high voltage end and the low-voltage end of the output voltage of described driving current generating circuit, and multiple described switches are in parallel with one or more described LED respectively.
Optionally, described LED array includes two LED and two switches,
Said two LED is LED and the two LED respectively, and the negative pole of a described LED is connected with the positive pole of described 2nd LED, and the positive pole of a described LED and the negative pole of described 2nd LED are connected with described high voltage end, low-voltage end respectively；
Said two switch respectively the first switch and second switch, described first switch and second switch are in parallel with a described LED and the 2nd LED respectively.
Further, described first magnitude of voltage is minimum voltage levels, and described third voltage value is maximum voltage grade, and described first current value is maximum current, and described 3rd current value is that minimum current is 1/2nd of described first electric current,
When the output of described LED drive circuit is firm power:
When described busbar voltage reaches described first magnitude of voltage, described LED structure control circuit controls described first switch or second switch disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit；
When described busbar voltage reaches described third voltage value, described LED structure control circuit controls described first switch and second switch all disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches described first magnitude of voltage, described LED structure control circuit controls described first switch or second switch disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described busbar voltage reaches described third voltage value, described LED structure control circuit controls described first switch and second switch all disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit.
Optionally, described LED array includes three LED and two switches,
Described three LED respectively the 3rd LED, the 4th LED and the five LED, the negative pole of described 3rd LED is connected with the positive pole of described 4th LED, the negative pole of described 4th LED is connected with the positive pole of described 5th LED, and the positive pole of described 3rd LED and the negative pole of described 5th LED are connected with described high voltage end, low-voltage end respectively；
Said two switch respectively the 3rd switch and the 4th switch, described 3rd switch is in parallel with described 3rd LED, and described 4th switch is in parallel with the two ends of described 4th LED and the 5th LED being connected in series；
Or, described 3rd switch is in parallel with described 5th LED, and described 4th switch is in parallel with the two ends of described 3rd LED and the 4th LED being connected in series.
Further, described first magnitude of voltage is minimum voltage levels, described third voltage value is maximum voltage grade, described second magnitude of voltage is between minimum voltage levels and maximum voltage grade, described first current value is maximum current, described second current value is in centre is described first current value 1/2nd of minimum current and maximum current, and described 3rd current value is that minimum current is 1/3rd of described first current value
When the output of described LED drive circuit is firm power:
When described busbar voltage reaches described first magnitude of voltage, described LED structure control circuit controls the described 3rd and switches off and the 4th switch Guan Bi, and described driving electric current is adjusted to described first current value by described driving current generating circuit；
When described busbar voltage reaches described second magnitude of voltage, described LED structure control circuit controls described 3rd switch Guan Bi and the 4th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches described third voltage value, described LED structure control circuit controls described 3rd switch and the 4th switch all disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit.
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches described first magnitude of voltage, described LED structure control circuit controls the described 3rd and switches off and the 4th switch Guan Bi, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described busbar voltage reaches described second magnitude of voltage, described LED structure control circuit controls described 3rd switch Guan Bi and the 4th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches described third voltage value, described LED structure control circuit controls described 3rd switch and the 4th switch all disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit.
Optionally, described LED array includes three LED and four switches,
Described three LED respectively the 6th LED, the 7th LED and the eight LED, the negative pole of described 6th LED is connected with the positive pole of described 7th LED, the negative pole of described 7th LED is connected with the positive pole of described 8th LED, and the positive pole of described 6th LED and the negative pole of described 8th LED are connected with described high voltage end, low-voltage end respectively；
Described four switches include the 5th switch, the 6th switch, the 7th switch and the 8th switch, described 5th switch is in parallel with described 6th LED, described 7th switch is in parallel with described 8th LED, described 6th switch is in parallel with the two ends of described 7th LED and the 8th LED being connected in series, and described 8th switch is in parallel with the two ends of described 6th LED and the 7th LED being connected in series.
Further, this LED array has two kinds of working methods, the first working method is that described 7th switch disconnects all the time with the 8th switch, described first magnitude of voltage is minimum voltage levels, described third voltage value is maximum voltage grade, described second magnitude of voltage is between minimum voltage levels and maximum voltage grade, described first current value is maximum current, described second current value is in centre is described first current value 1/2nd of minimum current and maximum current, described 3rd current value is that minimum current is 1/3rd of described first current value
When the output of described LED drive circuit is firm power:
When described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls the described 5th and switches off and the 6th switch Guan Bi, and described driving electric current is adjusted to described first current value by described driving current generating circuit；
When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 5th switch Guan Bi and the 6th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 5th switch and the 6th switch all disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit.
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls the described 5th and switches off and the 6th switch Guan Bi, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 5th switch Guan Bi and the 6th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 5th switch and the 6th switch all disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit.
The second working method is that described 5th switch disconnects all the time with the 6th switch, described first magnitude of voltage is minimum voltage levels, described third voltage value is maximum voltage grade, described second magnitude of voltage is between minimum voltage levels and maximum voltage grade, described first current value is maximum current, described second current value is in centre is described first current value 1/2nd of minimum current and maximum current, described 3rd current value is that minimum current is 1/3rd of described first current value
When the output of described LED drive circuit is firm power:
When described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls the described 7th and switches off and the 8th switch Guan Bi, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 7th switch Guan Bi and the 8th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 7th switch and the 8th switch all disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit.
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls the described 7th and switches off and the 8th switch Guan Bi, and described driving electric current is adjusted to described first current value by described driving current generating circuit；
When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 7th switch Guan Bi and the 8th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 7th switch and the 8th switch all disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit.
Compared with prior art, the method have the advantages that
LED drive circuit provided by the invention changes LED array of the prior art, utilization rate by switching every LED of adjustable of each switch, reduce energy consumption or realize high PF value basis on make in LED array the utilization rate of LED evenly, thus increasing the service life of LED drive circuit.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the structure basic block diagram of LED string in prior art；
The structural representation of the LED drive circuit that Fig. 2 provides for the embodiment of the present invention；
The circuit structure diagram of the LED array that Fig. 3 provides for the embodiment of the present invention one；
The circuit structure diagram of a kind of LED array that Fig. 4 provides for the embodiment of the present invention two；
The circuit structure diagram of the another kind of LED array that Fig. 5 provides for the embodiment of the present invention two；
The circuit structure diagram of the LED array that Fig. 6 provides for the embodiment of the present invention three；
The circuit structure diagram of the LED array that Fig. 7 provides for the embodiment of the present invention four.
In Fig. 1 to Fig. 7,
La, Lb, Lc, Lm1, Lm2, Lmn:LED；
Sa, Sb, Sm1, Sm2, Sm (n-1), Sm1 ', Sm2 ', Sm (n-1) ': switch；
L1: the one LED；L2: the two LED；L3: the three LED；L4: the four LED；
L5: the five LED；L6: the six LED；L7: the seven LED；L8: the eight LED；
S1: the first switch；S2: second switch；S3: the three switch；S4: the four switch；
S5: the five switch；S6: the six switch；S7: the seven switch；S8: the eight switch；
vin: alternating voltage；vg: DC voltage；vo: output voltage；iL: drive electric current.
Detailed description of the invention
The LED drive circuit present invention proposed below in conjunction with the drawings and specific embodiments is described in further detail.According to the following describes and claims, advantages and features of the invention will be apparent from.It should be noted that, accompanying drawing all adopts the form simplified very much and all uses non-ratio accurately, only in order to convenience, the purpose aiding in illustrating the embodiment of the present invention lucidly.
The core concept of the present invention is in that, a kind of LED drive circuit is provided, described LED drive circuit includes rectification circuit, drives current generating circuit, busbar voltage testing circuit, LED structure control circuit and LED array, the input incoming transport voltage of described rectification circuit, after described ac voltage rectifier, outfan output DC voltage；The input of described driving current generating circuit receives described DC voltage, outfan output driving current, and described driving electric current drives the work of described LED array；Described busbar voltage testing circuit is for detecting the busbar voltage in described driving current generating circuit, and outfan exports the size of described busbar voltage；Described LED structure control circuit controls turning on and off of each LED in described LED array according to the size of described busbar voltage；Described LED array include some LED being connected in series and with one or more switches in parallel for described LED, described LED structure control circuit control described in switch on-off.LED drive circuit provided by the invention changes LED array of the prior art, utilization rate by switching every LED of adjustable of each switch, reduce energy consumption or realize high PF value basis on make in LED array the utilization rate of LED evenly, thus increasing the service life of LED drive circuit.
Refer to the structural representation of the LED drive circuit that Fig. 2 to Fig. 6, Fig. 2 provide for the embodiment of the present invention；The circuit structure diagram of the LED array that Fig. 3 provides for the embodiment of the present invention one；The circuit structure diagram of a kind of LED array that Fig. 4 provides for the embodiment of the present invention two；The circuit structure diagram of the another kind of LED array that Fig. 5 provides for the embodiment of the present invention two；The circuit structure diagram of the LED array that Fig. 6 provides for the embodiment of the present invention three；The circuit structure diagram of the LED array that Fig. 7 provides for the embodiment of the present invention four.
As in figure 2 it is shown, the embodiment of the present invention provides a kind of LED drive circuit, it includes rectification circuit, drives current generating circuit, busbar voltage testing circuit, LED structure control circuit and LED array,
The input incoming transport voltage of described rectification circuit, after described ac voltage rectifier, outfan output DC voltage；
The input of described driving current generating circuit receives described DC voltage, outfan output driving current, and described driving electric current drives the work of described LED array；
Described busbar voltage testing circuit is for detecting the busbar voltage in described driving current generating circuit, and outfan exports the size of described busbar voltage；
Described LED structure control circuit controls turning on and off of each LED in described LED array according to the size of described busbar voltage；
Described LED array include some LED being connected in series and with one or more switches in parallel for described LED, described LED structure control circuit control described in switch on-off.
The embodiment of the present invention also provides for the driving method of a kind of described LED drive circuit, and described method includes:
Step one: after described rectification circuit is inputted the ac voltage rectifier of end, its outfan exports DC voltage to described driving current generating circuit；
Step 2: described DC voltage is converted to drive the driving electric current of LED array by described driving current generating circuit；
Step 3: described busbar voltage testing circuit detects the busbar voltage in described driving current generating circuit, its outfan exports described busbar voltage to described LED structure control circuit；
Step 4: described LED structure control circuit controls turning on and off of each LED in described LED array according to the size of described busbar voltage；And
Step 5: described driving current generating circuit regulates the driving electric current of its output according to the number of opening of described LED, to reduce energy consumption or to improve the power factor of described LED drive circuit.
Further, described driving current generating circuit median generatrix voltage and driving electric current are respectively divided into multiple grades of correspondence.
Further, the electric current that drives of described driving current generating circuit output can be adjusted according to the actual working state of LED each in described LED array,
When the grade of described busbar voltage of described busbar voltage testing circuit detection is gradually lowered, described in the LED that is connected in series gradually decrease it and open number, regulate described driving electric current and increase so that the output of described LED drive circuit is firm power,
Or, regulate described driving electric current and reduce, so that described LED drive circuit has High Power Factor value；
When the grade of described busbar voltage of described busbar voltage testing circuit detection gradually steps up, described in the LED that is connected in series be gradually increased it and open number, regulate described driving electric current and reduce so that the output of described LED drive circuit is firm power,
Or, regulate described driving electric current and increase, so that described LED drive circuit has High Power Factor value.
Further, the electric current that drives of described driving current generating circuit output can be adjusted according to the actual working state of LED each in described LED array, when the output of described LED drive circuit is firm power,
When the described busbar voltage of described busbar voltage testing circuit detection is the first magnitude of voltage, the described LED being connected in series to open number minimum, described drive current adjustment is the first current value, and the maximum of described driving electric current not can exceed that the load current value of described LED；
When the described busbar voltage of described busbar voltage testing circuit detection is the second magnitude of voltage, described in the number of opening of LED that is connected in series open number minimum and open at most between number, described drive current adjustment is the second current value；
When the described busbar voltage of described busbar voltage testing circuit detection is third voltage value, described in be connected in series LED to open number maximum, described drive current adjustment is the 3rd current value.
Further, the electric current that drives of described driving current generating circuit output can be adjusted according to the actual working state of LED each in described LED array, when described LED drive circuit has High Power Factor value,
When the described busbar voltage of described busbar voltage testing circuit detection is the first magnitude of voltage, described in be connected in series LED to open number minimum, described drive current adjustment is the 3rd current value；
When the described busbar voltage of described busbar voltage testing circuit detection is the second magnitude of voltage, the number of opening of the LED being connected in series is opened number minimum and open at most between number, and described drive current adjustment is the second current value；
When the described busbar voltage of described busbar voltage testing circuit detection is third voltage value, described in be connected in series LED to open number maximum, described drive current adjustment is the first current value.
Further, described LED array is to be formed by connecting by multiple described switches and multiple described LED, multiple described LED are sequentially connected in series between high voltage end and the low-voltage end of the output voltage of described driving current generating circuit, and multiple described switches are in parallel with one or more described LED respectively.
Embodiment one
In the present embodiment, as shown in Figure 3, described LED array includes two LEDL1, L2 and two switches S1, S2, said two LED is LEDL1 and the two LEDL2 respectively, the negative pole of a described LEDL1 is connected with the positive pole of described 2nd LEDL2, the positive pole of a described LEDL1 and the negative pole of described 2nd LEDL2 respectively with described output voltage voHigh-low voltage end connect, said two switch is the first switch S1 and second switch S2 respectively, described first switch S1 and second switch S2 is in parallel with a described LEDL1 and the 2nd LEDL2 respectively, and described LED structure control circuit is for controlling the break-make of said two switch S1, S2.
In the present embodiment, described first magnitude of voltage is minimum voltage levels, and described third voltage value is maximum voltage grade, and described first current value is maximum current, and described 3rd current value is that minimum current is 1/2nd of described first electric current.
Further, in step 4, when described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls described first switch S1 or second switch S2 and disconnects；When described busbar voltage reaches third voltage value, described LED structure control circuit controls described first switch S1 and second switch S2 and all disconnects.
In the present embodiment, every time when described busbar voltage reaches the first magnitude of voltage, the first switch S1 and second switch S2 can disconnect in turn, so that the utilization rate of described LED is uniform.
Further, in step 5, when the output of described LED drive circuit is firm power:
When described busbar voltage reaches described first magnitude of voltage, an only LEDL1 or the 2nd LEDL2 conducting, now voEqual to the pressure drop on a LEDL1 or the 2nd LEDL2 and VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the first current value IL, power PoFor PL；When described busbar voltage reaches third voltage value, LEDL1 and the two LEDL2 is both turned on, now voEqual to 2VL, described driving current generating circuit is by described driving electric current iLAdjust the second current value and IL/ 2, output PoFor PL, the output voltage of this circuit is constant so that it is energy consumption is minimum.
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches the first magnitude of voltage, an only LEDL1 or the 2nd LEDL2 conducting, now voEqual to the pressure drop on a LEDL1 or the 2nd LEDL2 and VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the second current value and IL/ 2, output PoFor PL/2；When described busbar voltage reaches the second magnitude of voltage, LEDL1 and the two LEDL2 is both turned on, now voEqual to 2VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the first current value IL, output PoFor 2PL, make this circuit be capable of high PF value when busbar voltage grade improves.
Embodiment two
The present embodiment is compared with the technical scheme in embodiment one, and the step 4 in its LED array and driving method thereof, five differences, all the other technical characteristics are all identical with embodiment one, just repeat no more at this.
In the present embodiment, as shown in Figure 4 and Figure 5, described LED array includes three LEDL3, L4, L5 and two switches S3, S4, described three LED respectively the 3rd LEDL3, the 4th LEDL4 and the five LEDL5, the negative pole of described 3rd LEDL3 is connected with the positive pole of described 4th LEDL4, the negative pole of described 4th LEDL4 is connected with the positive pole of described 5th LEDL5, the positive pole of described 3rd LEDL3 and the negative pole of described 5th LEDL5 respectively with described output voltage voHigh-low voltage end connect, said two switch respectively the 3rd switch S3 and the four switchs S4, described 3rd switch S3 is in parallel with described 3rd LEDL3 or the 5th LEDL5, described 4th switch S4 and another two LEDL4, L5 or L3, L4 is in parallel, and described LED structure control circuit is used for controlling said two and switchs the break-make of S3, S4.
In the present embodiment, described first magnitude of voltage is minimum voltage levels, described third voltage value is maximum voltage grade, described second magnitude of voltage is between minimum voltage levels and maximum voltage grade, described first current value is maximum current, described second current value is in centre is described first current value 1/2nd of minimum current and maximum current, and described 3rd current value is that minimum current is 1/3rd of described first current value.
Further, in step 4, when described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls described 3rd switch S3 and disconnects；When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 3rd switch S3 Guan Bi and the 4th switch S4 disconnects；When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 3rd switch S3 and the four switch S4 and all disconnects.
Further, in step 5, when the output of described LED drive circuit is firm power:
When described busbar voltage reaches the first magnitude of voltage, only the 3rd LEDL3 or the 5th LEDL5 conducting, now voEqual to the pressure drop on the 3rd LEDL3 or the 5th LEDL5 and VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the first current value IL, output PoFor PL；When described busbar voltage reaches the second magnitude of voltage, the 4th LEDL4 and the five LEDL5 or the 3rd LEDL3 and the four LEDL4 conducting, now voEqual to 2VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the second current value and IL/ 2, output PoFor PL；When described busbar voltage reaches third voltage value, the 3rd LEDL3, the 4th LEDL4 and the five LEDL5 are both turned on, now voEqual to 3VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the 3rd current value IL/ 3, output PoFor PL, the output voltage of this circuit is constant so that it is energy consumption is minimum.
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches the first magnitude of voltage, only the 3rd LEDL3 or the 5th LEDL5 conducting, now voEqual to the pressure drop on the 3rd LEDL3 or the 5th LEDL5 and VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the 3rd current value and IL/ 3, output PoFor PL/3；When described busbar voltage reaches the second magnitude of voltage, the 4th LEDL4 and the five LEDL5 or the 3rd LEDL3 and the four LEDL4 conducting, now voEqual to 2VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the second current value and IL/ 2, output PoFor PL；When described busbar voltage reaches third voltage value, the 3rd LEDL3, the 4th LEDL4 and the five LEDL5 are both turned on, now voEqual to 3VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the first current value IL, output PoFor 3PL, make this circuit be capable of high PF value when busbar voltage grade improves.
Embodiment three
The present embodiment is compared with the technical scheme in upper two embodiments, and the step 4 in its LED array and driving method thereof, five differences, all the other technical characteristics are all identical with upper two embodiments, just repeat no more at this.
In the present embodiment, as shown in Figure 6, described LED array includes three LEDL6, L7, L8 and four switches S5, S6, S7, S8, described three LED respectively the 6th LEDL6, the 7th LEDL7 and the eight LEDL8, the negative pole of described 6th LEDL6 is connected with the positive pole of described 7th LEDL7, the negative pole of described 7th LEDL7 is connected with the positive pole of described 8th LEDL8, the positive pole of described 6th LEDL6 and the negative pole of described 8th LEDL8 respectively with described output voltage voHigh-low voltage end connect, described four switches include the 5th switch S5, the 6th switch S6, the 7th switch S7 and the eight switch S8, it is in parallel with described 6th LEDL6 and the 8th LEDL8 respectively that 5th switch S5 and the seven switchs S7, described 6th switch S6 is in parallel with described 7th LEDL7 and the 8th LEDL8, described 8th switch S8 is in parallel with described 6th LEDL6 and the 7th LEDL7, and described LED structure control circuit is for controlling the break-make of described four switches S5, S6, S7, S8.
In the present embodiment, described first magnitude of voltage is minimum voltage levels, described third voltage value is maximum voltage grade, described second magnitude of voltage is between minimum voltage levels and maximum voltage grade, described first current value is maximum current, described second current value is in centre is described first current value 1/2nd of minimum current and maximum current, and described 3rd current value is that minimum current is 1/3rd of described first current value.
Further, in step 4, LED structure control circuit has two kinds of mode switching controls, and both mode switching controls can switch mutually, but can not carry out simultaneously, to avoid visual stroboscopic.
The first is: described 7th switch S7 and the eight switchs S8 and disconnect all the time, and when described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls described 5th switch S5 and disconnects；When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 5th switch S5 Guan Bi and the 6th switch S6 disconnects；When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 5th switch S5 and the six switch S6 and all disconnects.
The second is: described 5th switch S5 and the six switchs S6 and disconnect all the time, and when described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls described 7th switch S7 and disconnects；When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 7th switch S7 Guan Bi and the 8th switch S8 disconnects；When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 7th switch S7 and the eight switch S8 and all disconnects.
In the present embodiment, above two mode switching control can be operated in turn, so that the utilization rate of described LED is uniform.
Further, in step 5, when the output of described LED drive circuit is firm power:
When described busbar voltage reaches the first magnitude of voltage, only the 6th LEDL6 or the 8th LEDL8 conducting, now voEqual to the pressure drop on the 6th LEDL6 or the 8th LEDL8 and VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the first current value IL, output PoFor PL；When described busbar voltage reaches the second magnitude of voltage, the 7th LEDL7 and the eight LEDL8 or the 6th LEDL6 and the seven LEDL7 conducting, now voEqual to 2VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the second current value and IL/ 2, output PoFor PL；When described busbar voltage reaches third voltage value, the 6th LEDL6, the 7th LEDL7 and the eight LEDL8 are both turned on, now voEqual to 3VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the 3rd current value IL/ 3, output PoFor PL, the output voltage of this circuit is constant so that it is energy consumption is minimum.
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches the first magnitude of voltage, only the 6th LEDL6 or the 8th LEDL8 conducting, now voEqual to the pressure drop on the 6th LEDL6 or the 8th LEDL8 and VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the 3rd current value and IL/ 3, output PoFor PL/3；When described busbar voltage reaches the second magnitude of voltage, the 7th LEDL7 and the eight LEDL8 or the 6th LEDL6 and the seven LEDL7 conducting, now voEqual to 2VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the second current value and IL/ 2, output PoFor PL；When described busbar voltage reaches third voltage value, the 6th LEDL6, the 7th LEDL7 and the eight LEDL8 are both turned on, now voEqual to 3VL, described driving current generating circuit is by described driving electric current iLIt is adjusted to the first current value IL, output PoFor 3PL, make this circuit be capable of high PF value when busbar voltage grade improves.
Embodiment four
The present embodiment is the expansion structure of LED array in embodiment three, as it is shown in fig. 7, LEDLm1, Lm2 ... Lmn is sequentially connected in series and is connected to output voltage voHigh-low voltage end, switch Sm1, Sm2 ... one end of Sm (n-1) all with output voltage voHigh voltage end connect, its other end respectively with LEDLm1, Lm2 ... the negative pole of Lm (n-1) connects, and switchs Sm1 ', Sm2 ' ... one end of Sm (n-1) ' all with output voltage voLow-voltage end connect, its other end respectively with LEDLm2 ... the positive pole of Lmn connects.This LED structure control circuit has multiple mode switching control, and these mode switching controls can switch mutually, but can not carry out simultaneously, its respectively m1 state, m2 state ... m (n-1) state.
This expansion structure can freely control the break-make of wherein each LED and change the utilization rate of wherein each LED, busbar voltage often improves a grade just one LED of many conductings, and adjust driving electric current make the output of described LED drive circuit be firm power or make described LED drive circuit have High Power Factor value, reduce energy consumption or realize high PF value basis on make the utilization rate of described LED uniformly, thus increasing the service life of LED drive circuit.
Obviously, the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art.So, if these of the present invention are changed within the scope belonging to the claims in the present invention and equivalent technologies thereof with modification, then the present invention is also intended to comprise these change and modification.
Claims (14)
1. a LED drive circuit, it is characterised in that include rectification circuit, drive current generating circuit, busbar voltage testing circuit, LED structure control circuit and LED array,
The input incoming transport voltage of described rectification circuit, after described ac voltage rectifier, outfan output DC voltage；
The input of described driving current generating circuit receives described DC voltage, outfan output driving current, and described driving electric current drives the work of described LED array；
Described busbar voltage testing circuit is for detecting the busbar voltage of described driving current generating circuit output；
Described LED structure control circuit controls turning on and off of each LED in described LED array according to the size of described busbar voltage；
Described LED array include some LED being connected in series and with one or more switches in parallel for described LED, described LED structure control circuit control described in switch on-off.
2. LED drive circuit according to claim 1, it is characterised in that busbar voltage and driving electric current that described driving current generating circuit produces are respectively divided into corresponding multiple grades.
3. LED drive circuit according to claim 2, it is characterised in that the electric current that drives of described driving current generating circuit output can be adjusted according to the actual working state of LED each in described LED array,
When the grade of described busbar voltage of described busbar voltage testing circuit detection is gradually lowered, described in the LED that is connected in series gradually decrease it and open number, regulate described driving electric current and increase so that the output of described LED drive circuit is firm power,
Or, regulate described driving electric current and reduce, so that described LED drive circuit has High Power Factor value；
When the grade of described busbar voltage of described busbar voltage testing circuit detection gradually steps up, described in the LED that is connected in series be gradually increased it and open number, regulate described driving electric current and reduce so that the output of described LED drive circuit is firm power,
Or, regulate described driving electric current and increase, so that described LED drive circuit has High Power Factor value.
4. LED drive circuit according to claim 3, it is characterized in that, the electric current that drives of described driving current generating circuit output can be adjusted according to the actual working state of LED each in described LED array, when the output of described LED drive circuit is firm power
When the described busbar voltage of described busbar voltage testing circuit detection is the first magnitude of voltage, the described LED being connected in series to open number minimum, described drive current adjustment is the first current value, and the maximum of described driving electric current not can exceed that the load current value of described LED；
When the described busbar voltage of described busbar voltage testing circuit detection is the second magnitude of voltage, described in the number of opening of LED that is connected in series open number minimum and open at most between number, described drive current adjustment is the second current value；
When the described busbar voltage of described busbar voltage testing circuit detection is third voltage value, described in be connected in series LED to open number maximum, described drive current adjustment is the 3rd current value.
5. LED drive circuit according to claim 3, it is characterized in that, the electric current that drives of described driving current generating circuit output can be adjusted according to the actual working state of LED each in described LED array, when described LED drive circuit has High Power Factor value
When the described busbar voltage of described busbar voltage testing circuit detection is the first magnitude of voltage, described in be connected in series LED to open number minimum, described drive current adjustment is the 3rd current value；
When the described busbar voltage of described busbar voltage testing circuit detection is the second magnitude of voltage, described in the number of opening of LED that is connected in series open number minimum and open at most between number, described drive current adjustment is the second current value；
When the described busbar voltage of described busbar voltage testing circuit detection is third voltage value, the described LED being connected in series to open number maximum, described drive current adjustment is the first current value, and the maximum of described driving electric current not can exceed that the load current value of described LED.
6. the LED drive circuit according to claim 4 or 5, it is characterized in that, described LED array is to be formed by connecting by multiple described switches and multiple described LED, multiple described LED are sequentially connected in series between high voltage end and the low-voltage end of the output voltage of described driving current generating circuit, and multiple described switches are in parallel with one or more described LED respectively.
7. LED drive circuit according to claim 6, it is characterised in that described LED array includes two LED and two switches,
Said two LED is LED and the two LED respectively, and the negative pole of a described LED is connected with the positive pole of described 2nd LED, and the positive pole of a described LED and the negative pole of described 2nd LED are connected with described high voltage end, low-voltage end respectively；
Said two switch respectively the first switch and second switch, described first switch and second switch are in parallel with a described LED and the 2nd LED respectively.
8. LED drive circuit according to claim 7, it is characterised in that described first magnitude of voltage is minimum voltage levels, described third voltage value is maximum voltage grade, described first current value is maximum current, and described 3rd current value is that minimum current is 1/2nd of described first electric current
When the output of described LED drive circuit is firm power:
When described busbar voltage reaches described first magnitude of voltage, described LED structure control circuit controls described first switch or second switch disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit；
When described busbar voltage reaches described third voltage value, described LED structure control circuit controls described first switch and second switch all disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches described first magnitude of voltage, described LED structure control circuit controls described first switch or second switch disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described busbar voltage reaches described third voltage value, described LED structure control circuit controls described first switch and second switch all disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit.
9. LED drive circuit according to claim 6, it is characterised in that described LED array includes three LED and two switches,
Described three LED respectively the 3rd LED, the 4th LED and the five LED, the negative pole of described 3rd LED is connected with the positive pole of described 4th LED, the negative pole of described 4th LED is connected with the positive pole of described 5th LED, and the positive pole of described 3rd LED and the negative pole of described 5th LED are connected with described high voltage end, low-voltage end respectively；
Said two switch respectively the 3rd switch and the 4th switch, described 3rd switch is in parallel with described 3rd LED, and described 4th switch is in parallel with the two ends of described 4th LED and the 5th LED being connected in series；
Or, described 3rd switch is in parallel with described 5th LED, and described 4th switch is in parallel with the two ends of described 3rd LED and the 4th LED being connected in series.
10. LED drive circuit according to claim 9, it is characterized in that, described first magnitude of voltage is minimum voltage levels, described third voltage value is maximum voltage grade, described second magnitude of voltage is between minimum voltage levels and maximum voltage grade, and described first current value is maximum current, and described second current value is in centre is described first current value 1/2nd of minimum current and maximum current, described 3rd current value is that minimum current is 1/3rd of described first current value
When the output of described LED drive circuit is firm power:
When described busbar voltage reaches described first magnitude of voltage, described LED structure control circuit controls the described 3rd and switches off and the 4th switch Guan Bi, and described driving electric current is adjusted to described first current value by described driving current generating circuit；
When described busbar voltage reaches described second magnitude of voltage, described LED structure control circuit controls described 3rd switch Guan Bi and the 4th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches described third voltage value, described LED structure control circuit controls described 3rd switch and the 4th switch all disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit.
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches described first magnitude of voltage, described LED structure control circuit controls the described 3rd and switches off and the 4th switch Guan Bi, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described busbar voltage reaches described second magnitude of voltage, described LED structure control circuit controls described 3rd switch Guan Bi and the 4th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches described third voltage value, described LED structure control circuit controls described 3rd switch and the 4th switch all disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit.
11. LED drive circuit according to claim 6, it is characterised in that described LED array includes three LED and four switches,
Described three LED respectively the 6th LED, the 7th LED and the eight LED, the negative pole of described 6th LED is connected with the positive pole of described 7th LED, the negative pole of described 7th LED is connected with the positive pole of described 8th LED, and the positive pole of described 6th LED and the negative pole of described 8th LED are connected with described high voltage end, low-voltage end respectively；
Described four switches include the 5th switch, the 6th switch, the 7th switch and the 8th switch, described 5th switch is in parallel with described 6th LED, described 7th switch is in parallel with described 8th LED, described 6th switch is in parallel with the two ends of described 7th LED and the 8th LED being connected in series, and described 8th switch is in parallel with the two ends of described 6th LED and the 7th LED being connected in series.
12. LED drive circuit according to claim 11, it is characterized in that, described 7th switch and the 8th switch disconnect all the time, described first magnitude of voltage is minimum voltage levels, described third voltage value is maximum voltage grade, described second magnitude of voltage is between minimum voltage levels and maximum voltage grade, described first current value is maximum current, described second current value is in centre is described first current value 1/2nd of minimum current and maximum current, described 3rd current value is that minimum current is 1/3rd of described first current value
When the output of described LED drive circuit is firm power:
When described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls the described 5th and switches off and the 6th switch Guan Bi, and described driving electric current is adjusted to described first current value by described driving current generating circuit；
When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 5th switch Guan Bi and the 6th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 5th switch and the 6th switch all disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit.
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls the described 5th and switches off and the 6th switch Guan Bi, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 5th switch Guan Bi and the 6th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 5th switch and the 6th switch all disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit.
13. LED drive circuit according to claim 11, it is characterized in that, described 5th switch and the 6th switch disconnect all the time, described first magnitude of voltage is minimum voltage levels, described third voltage value is maximum voltage grade, described second magnitude of voltage is between minimum voltage levels and maximum voltage grade, described first current value is maximum current, described second current value is in centre is described first current value 1/2nd of minimum current and maximum current, described 3rd current value is that minimum current is 1/3rd of described first current value
When the output of described LED drive circuit is firm power:
When described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls the described 7th and switches off and the 8th switch Guan Bi, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit；
When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 7th switch Guan Bi and the 8th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 7th switch and the 8th switch all disconnects, and described driving electric current is adjusted to described first current value by described driving current generating circuit.
When described LED drive circuit has High Power Factor value:
When described busbar voltage reaches the first magnitude of voltage, described LED structure control circuit controls the described 7th and switches off and the 8th switch Guan Bi, and described driving electric current is adjusted to described first current value by described driving current generating circuit；
When described busbar voltage reaches the second magnitude of voltage, described LED structure control circuit controls described 7th switch Guan Bi and the 8th and switches off, and described driving electric current is adjusted to described second current value by described driving current generating circuit；
When described busbar voltage reaches third voltage value, described LED structure control circuit controls described 7th switch and the 8th switch all disconnects, and described driving electric current is adjusted to described 3rd current value by described driving current generating circuit.
14. LED drive circuit according to claim 1, it is characterised in that described LED array is connected to the outfan of described driving current generating circuit；Described LED array includes n LED, and described switch includes (n-1) and organizes switches set, and each switches set includes two switches being connected in series in the outfan of described driving current generating circuit；The points of common connection of said two switch is sequentially connected to the points of common connection of the described LED of adjacent two.
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Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 room A1501, science and Technology Park, East Software Park, No. 90, Wensanlu Road, Zhejiang, China Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |
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