CN105792439B - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN105792439B CN105792439B CN201610264785.2A CN201610264785A CN105792439B CN 105792439 B CN105792439 B CN 105792439B CN 201610264785 A CN201610264785 A CN 201610264785A CN 105792439 B CN105792439 B CN 105792439B
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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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- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a kind of LED drive circuit, and the LED drive circuit includes rectification circuit, driving current generation circuit, busbar voltage detection circuit, LED structure control circuit and LED array.LED drive circuit provided by the invention is on the basis of reducing energy consumption or realizing high PF value, change LED array in the prior art, the utilization rate that can adjust every LED by the switching of each switch makes the utilization rate of LED in LED array more evenly, to increase the service life of LED drive circuit.
Description
The application is application No. is 201310460841.6, and the applying date is on 09 29th, 2013, entitled " LED
The divisional application of driving circuit ".
Technical field
The present invention relates to a kind of driving circuit more particularly to a kind of LED drive circuits.
Background technique
In order to meet relevant harmonic standard, the PF of AC-DC LED driver (AC-DC LED drive)
(Power Factor, abbreviation power factor) value must be within the specified scope.Traditional AC-DC LED driver is divided into single stage type
AC-DC LED driver and two-stage type AC-DC LED driver.Single stage type AC-DC LED driver, by designing reasonable ginseng
High PF value may be implemented in number, but control variable is limited, is unfavorable for optimizing the efficiency of LED driver and it is necessary to use electrolysis electricity
The problem of appearance, this affects the service life of LED driver, while there may be visual stroboscopics.Two-stage type AC-DC LED driving
Device can take entire variable control, realize high PF value, and be conducive to optimize the efficiency of LED driver, and be able to achieve without visual
Stroboscopic.Since the input of LED driver is the power of a pulsation, and exporting is a straight power, needs intermediate bus bar
On storage capacitor balance the two power, if the storage capacitor uses electrolytic capacitor, affect the use of LED driver
Service life；If the storage capacitor is answered using ceramics or thin-film capacitor, the voltage that intermediate-bus voltage may be made to be limited to capacitor
Power range, or voltage stress range is met, but the chip area that capacitor occupies is big, increases the cost of LED driver.
Currently, there are also a kind of AC-DC LED driver based on multistage busbar voltage, the driver can by power from
The problem of dispersion controls to realize no electrolytic capacitor, improves the service life of LED driver, and visual stroboscopic is not present.It is first
You propose sequence multi-stage LED (light emitting diode) lamp string structure control strategy, the basic structure of LED light string such as Fig. 1 by semiconductor
Shown, the advantages of operating mode, is to control simple, the problem of visual stroboscopic is not present in any one LED, but LED is utilized
Rate is unbalanced, such as when switch Sa conducting, LED La shines always；When switch Sb conducting, LED La and Lb shine always；
When switch Sa, Sb shutdown, LED La, Lb and Lc shine always, it is known that the utilization rate of LED La is very high, the benefit of LED Lb, Lc
Lower with rate, this may will affect the service life of whole system.Therefore, the unreasonable of the structure design of LED is loaded, can be led
Cause LED utilization rate not high or unbalanced, to influence the service life of whole system.
Summary of the invention
The present invention provides a kind of LED drive circuit, on the basis of reducing energy consumption or realizing high PF value, equilibrium is utilized
LED increases the service life of LED drive circuit.
In order to achieve the above objectives, the present invention provides a kind of LED drive circuit comprising rectification circuit, driving current generate
Circuit, busbar voltage detection circuit, LED structure control circuit and LED array,
The input terminal of the rectification circuit accesses alternating voltage, and after the ac voltage rectifier, output end exports direct current
Voltage；
The input terminal of the driving current generation circuit receives the DC voltage, and output end output driving current is described
Driving current drives the LED array work；
The busbar voltage detection circuit is used to detect the busbar voltage in the driving current generation circuit, and output end is defeated
The size of the busbar voltage out；
The LED structure control circuit controls opening for each LED in the LED array according to the size of the busbar voltage
Logical and shutdown；
The LED array includes the LED and the switch in parallel with one or more LED of several series connections, institute
It states and is switched on-off described in the control of LED structure control circuit.
The present invention also provides a kind of driving methods of LED drive circuit, which comprises
Step 1: after the rectification circuit is inputted the ac voltage rectifier at end, output end is to the driving current
Generation circuit exports DC voltage；
Step 2: the DC voltage is converted to the driving to drive LED array by the driving current generation circuit
Electric current；
Step 3: the busbar voltage detection circuit detects the busbar voltage in the driving current generation circuit, defeated
Outlet exports the busbar voltage to the LED structure control circuit；
Step 4: the LED structure control circuit controls each in the LED array according to the size of the busbar voltage
LED's turns on and off；And
Step 5: the driving current generation circuit according to the LED open number adjust its output driving electricity
Stream, to reduce energy consumption or improve the power factor of the LED drive circuit.
Further, the driving current generation circuit median generatrix voltage and driving current are respectively divided into corresponding multiple etc.
Grade.
Further, the driving current of the driving current generation circuit output can be according to LED each in the LED array
Actual working state be adjusted,
When the grade of the busbar voltage of busbar voltage detection circuit detection gradually decreases, the series connection
LED gradually decrease it and open number, adjust the driving current and increase, so that the output power of the LED drive circuit is
Firm power,
Reduce alternatively, adjusting the driving current, so that the LED drive circuit has High Power Factor value；
When the grade of the busbar voltage of busbar voltage detection circuit detection is gradually increased, the series connection
LED gradually increase it and open number, adjust the driving current and reduce, so that the output power of the LED drive circuit is
Firm power,
Increase alternatively, adjusting the driving current, so that the LED drive circuit has High Power Factor value.
Further, the driving current of the driving current generation circuit output can be according to LED each in the LED array
Actual working state be adjusted, the output power of the LED drive circuit be firm power in the case where,
When the busbar voltage of busbar voltage detection circuit detection is the first voltage value, the series connection
LED to open number minimum, the drive current adjustment is the first current value, and the maximum value of the driving current is no more than institute
State the load current value of LED；
When the busbar voltage of busbar voltage detection circuit detection is second voltage value, the series connection
LED's opens number positioned at least opening number and at most opening between number, and the drive current adjustment is the second current value；
When the busbar voltage of busbar voltage detection circuit detection is third voltage value, the series connection
LED to open number most, the drive current adjustment is third current value.
Further, the driving current of the driving current generation circuit output can be according to LED each in the LED array
Actual working state be adjusted, the LED drive circuit have High Power Factor value in the case where,
When the busbar voltage of busbar voltage detection circuit detection is the first voltage value, the series connection
LED to open number minimum, the drive current adjustment is third current value；
When the busbar voltage of busbar voltage detection circuit detection is second voltage value, the series connection
LED's opens number positioned at least opening number and at most opening between number, and the drive current adjustment is the second current value；
When the busbar voltage of busbar voltage detection circuit detection is third voltage value, the series connection
LED to open number most, the drive current adjustment is the first current value, and the maximum value of the driving current is no more than institute
State the load current value of LED.
Further, the LED array is formed by connecting by multiple switches and multiple LED, multiple LED
It is sequentially connected in series between the high voltage end and low-voltage end of the output voltage of the driving current generation circuit, it is multiple described
Switch is in parallel with one or more LED respectively.
Optionally, the LED array includes two LED and two switches,
Described two LED are respectively the first LED and the 2nd LED, and the cathode and the 2nd LED of the first LED is just
Pole connection, the cathode of positive and described 2nd LED of the first LED are connect with the high voltage end, low-voltage end respectively；
It is described two switch be respectively first switch and the second switch, the first switch and the second switch respectively with it is described
First LED and the 2nd LED is in parallel.
Further, the first voltage value is minimum voltage levels, and the third voltage value is maximum voltage grade, institute
Stating the first current value is maximum current, and the third current value is the half that minimum current is first electric current,
In the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, the LED structure control circuit control described first is opened
It closes or second switch disconnects, the driving current is adjusted to first current value by the driving current generation circuit；
When the busbar voltage reaches the third voltage value, the LED structure control circuit control described first is opened
It closes and second switch disconnects, the driving current is adjusted to the third current value by the driving current generation circuit；
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, the LED structure control circuit control described first is opened
It closes or second switch disconnects, the driving current is adjusted to the third current value by the driving current generation circuit；
When the busbar voltage reaches the third voltage value, the LED structure control circuit control described first is opened
It closes and second switch disconnects, the driving current is adjusted to first current value by the driving current generation circuit.
Optionally, the LED array includes three LED and two switches,
Three LED are respectively the 3rd LED, the 4th LED and the 5th LED, the cathode and the described 4th of the 3rd LED
The anode connection of LED, the cathode of the 4th LED are connect with the anode of the 5th LED, the anode of the 3rd LED and institute
The cathode for stating the 5th LED is connect with the high voltage end, low-voltage end respectively；
Described two switches are respectively third switch and the 4th switch, and the third switchs, institute in parallel with the 3rd LED
It is in parallel with the both ends of the 4th LED and the 5th LED being connected in series to state the 4th switch；
Alternatively, the third switch is in parallel with the 5th LED, the 4th switch and the third being connected in series
The both ends of LED and the 4th LED are in parallel.
Further, the first voltage value is minimum voltage levels, and the third voltage value is maximum voltage grade, institute
It states second voltage value to be between minimum voltage levels and maximum voltage grade, first current value is maximum current, described
The centre that second current value is in minimum current and maximum current is the half of first current value, the third electric current
Value is the one third that minimum current is first current value,
In the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, the LED structure control circuit controls the third and opens
Shutdown is opened and the 4th closes the switch, and the driving current is adjusted to first current value by the driving current generation circuit；
When the busbar voltage reaches the second voltage value, the LED structure control circuit controls the third and opens
It closes conjunction and the 4th switch disconnects, the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches the third voltage value, the LED structure control circuit controls the third and opens
It closes and the 4th switch disconnects, the driving current is adjusted to the third current value by the driving current generation circuit.
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, the LED structure control circuit controls the third and opens
Shutdown is opened and the 4th closes the switch, and the driving current is adjusted to the third current value by the driving current generation circuit；
When the busbar voltage reaches the second voltage value, the LED structure control circuit controls the third and opens
It closes conjunction and the 4th switch disconnects, the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches the third voltage value, the LED structure control circuit controls the third and opens
It closes and the 4th switch disconnects, the driving current is adjusted to first current value by the driving current generation circuit.
Optionally, the LED array includes three LED and four switches,
Three LED are respectively the 6th LED, the 7th LED and the 8th LED, the cathode and the described 7th of the 6th LED
The anode connection of LED, the cathode of the 7th LED are connect with the anode of the 8th LED, the anode of the 6th LED and institute
The cathode for stating the 8th LED is connect with the high voltage end, low-voltage end respectively；
It is described four switch include the 5th switch, the 6th switch, the 7th switch and the 8th switch, it is described 5th switch and institute
The 6th LED parallel connection is stated, the 7th switch is in parallel with the 8th LED, the 6th switch and the described 7th of series connection
The both ends of LED and the 8th LED are in parallel, and the both ends of the 8th switch and the 6th LED and the 7th LED being connected in series are simultaneously
Connection.
Further, for the LED array there are two types of working method, the first working method is that the 7th switch and the 8th open
Pass disconnect always, the first voltage value be minimum voltage levels, the third voltage value be maximum voltage grade, described second
Voltage value is between minimum voltage levels and maximum voltage grade, and first current value is maximum current, second electricity
The centre that flow valuve is in minimum current and maximum current is the half of first current value, and the third current value is most
Low current is the one third of first current value,
In the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, LED structure control circuit control the 5th switch is disconnected
It opens and the 6th closes the switch, the driving current is adjusted to first current value by the driving current generation circuit；
When the busbar voltage reaches second voltage value, LED structure control circuit control the 5th switch is closed
It closes and the 6th switch disconnects, the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches third voltage value, LED structure control circuit control the 5th switch and
6th switch disconnects, and the driving current is adjusted to the third current value by the driving current generation circuit.
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, LED structure control circuit control the 5th switch is disconnected
It opens and the 6th closes the switch, the driving current is adjusted to the third current value by the driving current generation circuit；
When the busbar voltage reaches second voltage value, LED structure control circuit control the 5th switch is closed
It closes and the 6th switch disconnects, the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches third voltage value, LED structure control circuit control the 5th switch and
6th switch disconnects, and the driving current is adjusted to first current value by the driving current generation circuit.
Second of working method is that the 5th switch and the 6th switch disconnect always, and the first voltage value is minimum electricity
Grade is pressed, the third voltage value is maximum voltage grade, and the second voltage value is in minimum voltage levels and maximum voltage
Between grade, first current value is maximum current, and second current value is in the centre of minimum current and maximum current
For the half of first current value, the third current value be minimum current be first current value three/
One,
In the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, LED structure control circuit control the 7th switch is disconnected
It opens and the 8th closes the switch, the driving current is adjusted to the third current value by the driving current generation circuit；
When the busbar voltage reaches second voltage value, LED structure control circuit control the 7th switch is closed
It closes and the 8th switch disconnects, the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches third voltage value, LED structure control circuit control the 7th switch and
8th switch disconnects, and the driving current is adjusted to first current value by the driving current generation circuit.
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, LED structure control circuit control the 7th switch is disconnected
It opens and the 8th closes the switch, the driving current is adjusted to first current value by the driving current generation circuit；
When the busbar voltage reaches second voltage value, LED structure control circuit control the 7th switch is closed
It closes and the 8th switch disconnects, the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches third voltage value, LED structure control circuit control the 7th switch and
8th switch disconnects, and the driving current is adjusted to the third current value by the driving current generation circuit.
Compared with prior art, the invention has the following advantages:
LED drive circuit provided by the invention changes LED array in the prior art, and the switching by each switch is adjustable
The utilization rate of whole every LED makes the utilization rate of LED in LED array more evenly on the basis of reducing energy consumption or realizing high PF value,
To increase the service life of LED drive circuit.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings:
Fig. 1 is the structure basic block diagram of LED light string in the prior art；
Fig. 2 is the structural schematic diagram of LED drive circuit provided in an embodiment of the present invention；
Fig. 3 is the circuit structure diagram for the LED array that the embodiment of the present invention one provides；
Fig. 4 is a kind of circuit structure diagram of LED array provided by Embodiment 2 of the present invention；
Fig. 5 is the circuit structure diagram of another LED array provided by Embodiment 2 of the present invention；
Fig. 6 is the circuit structure diagram for the LED array that the embodiment of the present invention three provides；
Fig. 7 is the circuit structure diagram for the LED array that the embodiment of the present invention four provides.
In Fig. 1 into 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: first switch；S2: second switch；S3: third 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: driving current.
Specific embodiment
LED drive circuit proposed by the present invention is described in further detail below in conjunction with the drawings and specific embodiments.Root
According to following explanation and claims, advantages and features of the invention will be become apparent from.It should be noted that attached drawing be all made of it is very simple
The form of change and use non-accurate ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
Core of the invention thought is, provides a kind of LED drive circuit, the LED drive circuit include rectification circuit,
Driving current generation circuit, busbar voltage detection circuit, LED structure control circuit and LED array, the input of the rectification circuit
It terminates into alternating voltage, after the ac voltage rectifier, output end exports DC voltage；The driving current generation circuit
Input terminal receives the DC voltage, output end output driving current, and the driving current drives the LED array work；Institute
It states busbar voltage detection circuit and exports the bus for detecting the busbar voltage in the driving current generation circuit, output end
The size of voltage；The LED structure control circuit controls each LED in the LED array according to the size of the busbar voltage
Turn on and off；The LED array include several series connections LED and with one or more LED are in parallel opens
It closes, is switched on-off described in the LED structure control circuit control.LED drive circuit provided by the invention changes existing skill
LED array in art can adjust the utilization rate of every LED by the switching of each switch, is reducing energy consumption or is realizing high PF value
On the basis of make the utilization rate of LED in LED array more evenly, to increase the service life of LED drive circuit.
Fig. 2 to Fig. 6 is please referred to, Fig. 2 is the structural schematic diagram of LED drive circuit provided in an embodiment of the present invention；Fig. 3 is this
The circuit structure diagram for the LED array that inventive embodiments one provide；Fig. 4 is a kind of LED array provided by Embodiment 2 of the present invention
Circuit structure diagram；Fig. 5 is the circuit structure diagram of another LED array provided by Embodiment 2 of the present invention；Fig. 6 is that the present invention is implemented
The circuit structure diagram for the LED array that example three provides；Fig. 7 is the circuit structure diagram for the LED array that the embodiment of the present invention four provides.
As shown in Fig. 2, the embodiment of the present invention provides a kind of LED drive circuit comprising rectification circuit, driving current generate
Circuit, busbar voltage detection circuit, LED structure control circuit and LED array,
The input terminal of the rectification circuit accesses alternating voltage, and after the ac voltage rectifier, output end exports direct current
Voltage；
The input terminal of the driving current generation circuit receives the DC voltage, and output end output driving current is described
Driving current drives the LED array work；
The busbar voltage detection circuit is used to detect the busbar voltage in the driving current generation circuit, and output end is defeated
The size of the busbar voltage out；
The LED structure control circuit controls opening for each LED in the LED array according to the size of the busbar voltage
Logical and shutdown；
The LED array includes the LED and the switch in parallel with one or more LED of several series connections, institute
It states and is switched on-off described in the control of LED structure control circuit.
The embodiment of the present invention also provides a kind of driving method of LED drive circuit, which comprises
Step 1: after the rectification circuit is inputted the ac voltage rectifier at end, output end is to the driving current
Generation circuit exports DC voltage；
Step 2: the DC voltage is converted to the driving to drive LED array by the driving current generation circuit
Electric current；
Step 3: the busbar voltage detection circuit detects the busbar voltage in the driving current generation circuit, defeated
Outlet exports the busbar voltage to the LED structure control circuit；
Step 4: the LED structure control circuit controls each in the LED array according to the size of the busbar voltage
LED's turns on and off；And
Step 5: the driving current generation circuit according to the LED open number adjust its output driving electricity
Stream, to reduce energy consumption or improve the power factor of the LED drive circuit.
Further, the driving current generation circuit median generatrix voltage and driving current are respectively divided into corresponding multiple etc.
Grade.
Further, the driving current of the driving current generation circuit output can be according to LED each in the LED array
Actual working state be adjusted,
When the grade of the busbar voltage of busbar voltage detection circuit detection gradually decreases, the series connection
LED gradually decrease it and open number, adjust the driving current and increase, so that the output power of the LED drive circuit is
Firm power,
Reduce alternatively, adjusting the driving current, so that the LED drive circuit has High Power Factor value；
When the grade of the busbar voltage of busbar voltage detection circuit detection is gradually increased, the series connection
LED gradually increase it and open number, adjust the driving current and reduce, so that the output power of the LED drive circuit is
Firm power,
Increase alternatively, adjusting the driving current, so that the LED drive circuit has High Power Factor value.
Further, the driving current of the driving current generation circuit output can be according to LED each in the LED array
Actual working state be adjusted, the output power of the LED drive circuit be firm power in the case where,
When the busbar voltage of busbar voltage detection circuit detection is the first voltage value, the series connection
LED to open number minimum, the drive current adjustment is the first current value, and the maximum value of the driving current is no more than institute
State the load current value of LED；
When the busbar voltage of busbar voltage detection circuit detection is second voltage value, the series connection
LED's opens number positioned at least opening number and at most opening between number, and the drive current adjustment is the second current value；
When the busbar voltage of busbar voltage detection circuit detection is third voltage value, the series connection
LED to open number most, the drive current adjustment is third current value.
Further, the driving current of the driving current generation circuit output can be according to LED each in the LED array
Actual working state be adjusted, the LED drive circuit have High Power Factor value in the case where,
When the busbar voltage of busbar voltage detection circuit detection is the first voltage value, the series connection
LED to open number minimum, the drive current adjustment is third current value；
When the busbar voltage of busbar voltage detection circuit detection is second voltage value, the LED of series connection
Open number be located at least open number and at most open between number, the drive current adjustment be the second current value；
When the busbar voltage of busbar voltage detection circuit detection is third voltage value, the series connection
LED to open number most, the drive current adjustment is the first current value.
Further, the LED array is formed by connecting by multiple switches and multiple LED, multiple LED
It is sequentially connected in series between the high voltage end and low-voltage end of the output voltage of the driving current generation circuit, it is multiple described
Switch is in parallel with one or more LED respectively.
Embodiment one
In the present embodiment, as shown in figure 3, the LED array includes two LED L1, L2 and two switch S1, S2, institute
Stating two LED is respectively the first LED L1 and the 2nd LED L2, and the cathode of the first LED L1 is with the 2nd LED L2's
Anode connection, the cathode of the positive and described 2nd LED L2 of the first LED L1 respectively with the output voltage voHeight,
Low-voltage end connection, described two switches are respectively first switch S1 and second switch S2, and the first switch S1 and second is opened
It is in parallel with the first LED L1 and the 2nd LED L2 respectively to close S2, the LED structure control circuit is described two for controlling
The on-off of switch S1, S2.
In the present embodiment, the first voltage value is minimum voltage levels, and the third voltage value is maximum voltage etc.
Grade, first current value be maximum current, the third current value be minimum current be first electric current two/
One.
Further, in step 4, when the busbar voltage reaches the first voltage value, the LED structure control electricity
Road controls the first switch S1 or second switch S2 and disconnects；When the busbar voltage reaches third voltage value, the LED junction
Structure control circuit controls the first switch S1 and second switch S2 and disconnects.
In the present embodiment, every time when the busbar voltage reaches the first voltage value, first switch S1 and second switch
S2 can be disconnected in turn, so that the utilization rate of the LED is uniform.
Further, in step 5, in the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, only the first LED L1 or the 2nd LED L2 conducting, this
When voEqual to pressure drop, that is, V on the first LED L1 or the 2nd LED L2L, the driving current generation circuit is by the driving current
iLIt is adjusted to the first current value IL, power PoFor PL；When the busbar voltage reaches third voltage value, the first LED L1 and
Two LED L2 are both turned on, at this time voEqual to 2VL, the driving current generation circuit is by the driving current iLAdjust the second electric current
Value is IL/ 2, output power PoFor PL, the output voltage of the circuit is constant, and it is minimum for can consuming.
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, only the first LED L1 or the 2nd LED L2 are connected, at this time vo
Equal to pressure drop, that is, V on the first LEDL1 or the 2nd LEDL2L, the driving current generation circuit is by the driving current iLAdjustment
For the second current value, that is, IL/ 2, output power PoFor PL/2；When the busbar voltage reaches second voltage value, the first LED L1
It is both turned on the 2nd LED L2, at this time voEqual to 2VL, the driving current generation circuit is by the driving current iLIt is adjusted to
One current value IL, output power PoFor 2PL, the circuit is made to can be realized high PF value when busbar voltage grade improves.
Embodiment two
The present embodiment is compared with the technical solution in embodiment one, LED array and its step four in driving method, five
Difference, remaining technical characteristic is identical as in embodiment one, just repeats no more herein.
In the present embodiment, as shown in Figure 4 and Figure 5, the LED array includes three LED L3, L4, L5 and two switches
S3, S4, three LED are respectively the 3rd LED L3, the 4th LED L4 and the 5th LED L5, the cathode of the 3rd LED L3
It is connect with the anode of the 4th LED L4, the cathode of the 4th LED L4 is connect with the anode of the 5th LED L5, institute
State the cathode of the positive and described 5th LED L5 of the 3rd LED L3 respectively with the output voltage voHigh-low voltage end connect
Connect, it is described two switch be respectively third switch S3 and the 4th switch S4, the third switch S3 and the 3rd LED L3 or
5th LED L5 is in parallel, and the 4th switch S4 is in parallel with another two LED L4, L5 or L3, L4, the LED structure control circuit
For controlling the on-off of described two switch S3, S4.
In the present embodiment, the first voltage value is minimum voltage levels, and the third voltage value is maximum voltage etc.
Grade, the second voltage value are between minimum voltage levels and maximum voltage grade, and first current value is maximum current,
The centre that second current value is in minimum current and maximum current is the half of first current value, the third
Current value is the one third that minimum current is first current value.
Further, in step 4, when the busbar voltage reaches the first voltage value, the LED structure control electricity
Road controls the third switch S3 and disconnects；When the busbar voltage reaches second voltage value, the LED structure control circuit control
It makes the third switch S3 closure and the 4th switch S4 is disconnected；When the busbar voltage reaches third voltage value, the LED junction
Structure control circuit controls the third switch S3 and the 4th switch S4 and disconnects.
Further, in step 5, in the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, only the 3rd LED L3 or the 5th LED L5 are connected, at this time vo
Equal to pressure drop, that is, V on the 3rd LED L3 or the 5th LED L5L, the driving current generation circuit is by the driving current iLIt adjusts
Whole is the first current value IL, output power PoFor PL；When the busbar voltage reaches second voltage value, the 4th LED L4 and
Five LED L5 or the 3rd LED L3 and the 4th LED L4 are connected, at this time voEqual to 2VL, the driving current generation circuit will be described
Driving current iLIt is adjusted to the second current value i.e. IL/ 2, output power PoFor PL；When the busbar voltage reaches third voltage value
When, the 3rd LED L3, the 4th LED L4 and the 5th LED L5 are both turned on, at this time voEqual to 3VL, the driving current generation circuit
By the driving current iLIt is adjusted to third current value IL/ 3, output power PoFor PL, the output voltage of the circuit is constant, makes it
Energy consumption is minimum.
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, only the 3rd LED L3 or the 5th LED L5 are connected, at this time vo
Equal to pressure drop, that is, V on the 3rd LED L3 or the 5th LED L5L, the driving current generation circuit is by the driving current iLIt adjusts
Whole is third current value, that is, IL/ 3, output power PoFor PL/3；When the busbar voltage reaches second voltage value, the 4th LED
L4 and the 5th LED L5 or the 3rd LED L3 and the 4th LED L4 is connected, at this time voEqual to 2VL, the driving current generation circuit
By the driving current iLIt is adjusted to the second current value i.e. IL/ 2, output power PoFor PL；When the busbar voltage reaches third electricity
When pressure value, the 3rd LED L3, the 4th LED L4 and the 5th LED L5 are both turned on, at this time voEqual to 3VL, the driving current generation
Circuit is by the driving current iLIt is adjusted to the first current value IL, output power PoFor 3PL, make the circuit in busbar voltage grade
It can be realized high PF value when raising.
Embodiment three
Step of the present embodiment compared with the technical solution in upper two embodiments, in LED array and its driving method
Four, five is different, remaining technical characteristic is identical as in upper two embodiments, just repeats no more herein.
In the present embodiment, as shown in fig. 6, the LED array include three LED L6, L7, L8 and four switch S5,
S6, S7, S8, three LED are respectively the 6th LED L6, the 7th LED L7 and the 8th LED L8, the 6th LED L6's
Cathode is connect with the anode of the 7th LED L7, and the cathode of the 7th LED L7 and the anode of the 8th LED L8 connect
Connect, the cathode of the positive and described 8th LED L8 of the 6th LED L6 respectively with the output voltage voHigh-low voltage
End connection, four switches include the 5th switch S5, the 6th switch S6, the 7th switch S7 and the 8th switch S8, the 5th switch
S5 and the 7th switch S7 are in parallel with the 6th LED L6 and the 8th LED L8 respectively, the 6th switch S6 and the described 7th
LED L7 and the 8th LED L8 are in parallel, and the 8th switch S8 is in parallel with the 6th LED L6 and the 7th LED L7, the LED
Structure control circuit is used to control the on-off of described four switches S5, S6, S7, S8.
In the present embodiment, the first voltage value is minimum voltage levels, and the third voltage value is maximum voltage etc.
Grade, the second voltage value are between minimum voltage levels and maximum voltage grade, and first current value is maximum current,
The centre that second current value is in minimum current and maximum current is the half of first current value, the third
Current value is the one third that minimum current is first current value.
Further, in step 4, there are two types of mode switching control, both switch controls for LED structure control circuit
Mode can switch mutually, but can not carry out simultaneously, to avoid visual stroboscopic.
The first are as follows: the 7th switch S7 and the 8th switch S8 is disconnected always, when the busbar voltage reaches the first electricity
When pressure value, the LED structure control circuit controls the 5th switch S5 and disconnects；When the busbar voltage reaches second voltage value
When, the LED structure control circuit controls the 5th switch S5 closure and the 6th switch S6 is disconnected；When the busbar voltage reaches
When to third voltage value, the LED structure control circuit controls the 5th switch S5 and the 6th switch S6 and disconnects.
Second are as follows: the 5th switch S5 and the 6th switch S6 is disconnected always, when the busbar voltage reaches the first electricity
When pressure value, the LED structure control circuit controls the 7th switch S7 and disconnects；When the busbar voltage reaches second voltage value
When, the LED structure control circuit controls the 7th switch S7 closure and the 8th switch S8 is disconnected；When the busbar voltage reaches
When to third voltage value, the LED structure control circuit controls the 7th switch S7 and the 8th switch S8 and disconnects.
In the present embodiment, above two mode switching control can work in turn, so that the utilization rate of the LED is equal
It is even.
Further, in step 5, in the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, only the 6th LED L6 or the 8th LEDL8 are connected, at this time voDeng
Pressure drop, that is, V on the 6th LED L6 or the 8th LED L8L, the driving current generation circuit is by the driving current iLAdjustment
For the first current value IL, output power PoFor PL；When the busbar voltage reaches second voltage value, the 7th LED L7 and the 8th
LED L8 or the 6th LED L6 and the 7th LED L7 is connected, at this time voEqual to 2VL, the driving current generation circuit is by the drive
Streaming current iLIt is adjusted to the second current value i.e. IL/ 2, output power PoFor PL；When the busbar voltage reaches third voltage value,
6th LED L6, the 7th LED L7 and the 8th LED L8 are both turned on, at this time voEqual to 3VL, the driving current generation circuit is by institute
State driving current iLIt is adjusted to third current value IL/ 3, output power PoFor PL, the output voltage of the circuit is constant, can consume
It is minimum.
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, only the 6th LED L6 or the 8th LED L8 are connected, at this time vo
Equal to pressure drop, that is, V on the 6th LED L6 or the 8th LED L8L, the driving current generation circuit is by the driving current iLIt adjusts
Whole is third current value, that is, IL/ 3, output power PoFor PL/3；When the busbar voltage reaches second voltage value, the 7th LED
L7 and the 8th LED L8 or the 6th LED L6 and the 7th LED L7 is connected, at this time voEqual to 2VL, the driving current generation circuit
By the driving current iLIt is adjusted to the second current value i.e. IL/ 2, output power PoFor PL；When the busbar voltage reaches third electricity
When pressure value, the 6th LED L6, the 7th LED L7 and the 8th LED L8 are both turned on, at this time voEqual to 3VL, the driving current generation
Circuit is by the driving current iLIt is adjusted to the first current value IL, output power PoFor 3PL, make the circuit in busbar voltage grade
It can be realized high PF value when raising.
Example IV
The present embodiment be embodiment three in LED array expansion structure, as shown in fig. 7, LED Lm1, Lm2 ... Lmn according to
It is secondary to be connected in series in output voltage voHigh-low voltage end, one end of switch Sm1, Sm2 ... Sm (n-1) with output voltage vo's
High voltage end connection, the other end are connect with the cathode of LED Lm1, Lm2 ... Lm (n-1) respectively, switch Sm1 ', Sm2 ' ...
One end of Sm (n-1) ' with output voltage voLow-voltage end connection, the other end anode with LED Lm2 ... Lmn respectively
Connection.There are many mode switching control, these mode switching controls to switch mutually for the LED structure control circuit, but can not be same
Shi Jinhang, be respectively m1 state, m2 state ... m (n-1) state.
This expansion structure can freely control the wherein on-off of each LED and change the utilization rate of wherein each LED, and busbar voltage is every
A grade just one LED of more conductings is improved, and adjust driving current to make the constant function of the output power of the LED drive circuit
Rate makes the LED drive circuit have High Power Factor value, makes the LED on the basis of reducing energy consumption or realizing high PF value
Utilization rate it is uniform, to increase the service life of LED drive circuit.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modification and variations of the invention belong to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (14)
1. a kind of LED drive circuit, which is characterized in that including rectification circuit, driving current generation circuit, busbar voltage detection electricity
Road, LED structure control circuit and LED array,
The input terminal of the rectification circuit accesses alternating voltage, and after the ac voltage rectifier, output end exports DC voltage；
The input terminal of the driving current generation circuit receives the DC voltage, output end output driving current, the driving
Electric current drives the LED array work；
The busbar voltage detection circuit is used to detect the busbar voltage of the driving current generation circuit output；
The LED structure control circuit according to the size of the busbar voltage control each LED in the LED array open and
Shutdown；
The LED array includes the LED and the switch in parallel with one or more LED of several series connections, the LED
It is switched on-off described in structure control circuit control；
The driving current is adjusted so that the output power of the LED drive circuit is firm power or has high power
Factor value.
2. LED drive circuit according to claim 1, which is characterized in that the mother that the driving current generation circuit generates
Line voltage and driving current are respectively divided into corresponding multiple grades.
3. LED drive circuit according to claim 2, which is characterized in that the drive of the driving current generation circuit output
Streaming current can be adjusted according to the actual working state of LED each in the LED array,
When the grade of the busbar voltage of busbar voltage detection circuit detection gradually decreases, the series connection
LED gradually decreases it and opens number, adjusts the driving current and increases, so that the output power of the LED drive circuit is perseverance
Determine power,
Reduce alternatively, adjusting the driving current, so that the LED drive circuit has High Power Factor value；
When the grade of the busbar voltage of busbar voltage detection circuit detection is gradually increased, the series connection
LED gradually increases it and opens number, adjusts the driving current and reduces, so that the output power of the LED drive circuit is perseverance
Determine power,
Increase alternatively, adjusting the driving current, so that the LED drive circuit has High Power Factor value.
4. LED drive circuit according to claim 3, which is characterized in that the drive of the driving current generation circuit output
Streaming current can be adjusted according to the actual working state of LED each in the LED array, in the defeated of the LED drive circuit
In the case that power is firm power out,
When the busbar voltage of busbar voltage detection circuit detection is the first voltage value, the LED of the series connection
To open number minimum, the drive current adjustment is the first current value, and the maximum value of the driving current is no more than described
The load current value of LED；
When the busbar voltage of busbar voltage detection circuit detection is second voltage value, the LED of the series connection
Open number be located at least open number and at most open between number, the drive current adjustment be the second current value；
When the busbar voltage of busbar voltage detection circuit detection is third voltage value, the LED of the series connection
To open number most, the drive current adjustment is third current value.
5. LED drive circuit according to claim 3, which is characterized in that the drive of the driving current generation circuit output
Streaming current can be adjusted according to the actual working state of LED each in the LED array, have in the LED drive circuit
In the case where High Power Factor value,
When the busbar voltage of busbar voltage detection circuit detection is the first voltage value, the LED of the series connection
To open number minimum, the drive current adjustment is third current value；
When the busbar voltage of busbar voltage detection circuit detection is second voltage value, the LED of the series connection
Open number be located at least open number and at most open between number, the drive current adjustment be the second current value；
When the busbar voltage of busbar voltage detection circuit detection is third voltage value, the LED of the series connection
To open number most, the drive current adjustment is the first current value, and the maximum value of the driving current is no more than described
The load current value of LED.
6. LED drive circuit according to claim 4 or 5, which is characterized in that the LED array described is opened by multiple
It closes and multiple LED is formed by connecting, multiple LED are sequentially connected in series the output electricity in the driving current generation circuit
Between the high voltage end and low-voltage end of pressure, multiple switches are in parallel with one or more LED respectively.
7. LED drive circuit according to claim 6, which is characterized in that the LED array includes two LED and two
Switch,
Described two LED are respectively the first LED and the 2nd LED, and the cathode of the first LED and the anode of the 2nd LED connect
It connects, the cathode of positive and described 2nd LED of the first LED is connect with the high voltage end, low-voltage end respectively；
Described two switches are respectively first switch and the second switch, and the first switch and the second switch is respectively with described first
LED and the 2nd LED is in parallel.
8. LED drive circuit according to claim 7, which is characterized in that the first voltage value is minimum voltage levels,
The third voltage value is maximum voltage grade, and first current value is maximum current, and the third current value is minimum electricity
Stream is the half of first electric current,
In the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, the LED structure control circuit control the first switch or
Second switch disconnects, and the driving current is adjusted to first current value by the driving current generation circuit；
When the busbar voltage reaches the third voltage value, the LED structure control circuit control the first switch and
Second switch disconnects, and the driving current is adjusted to the third current value by the driving current generation circuit；
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, the LED structure control circuit control the first switch or
Second switch disconnects, and the driving current is adjusted to the third current value by the driving current generation circuit；
When the busbar voltage reaches the third voltage value, the LED structure control circuit control the first switch and
Second switch disconnects, and the driving current is adjusted to first current value by the driving current generation circuit.
9. LED drive circuit according to claim 6, which is characterized in that the LED array includes three LED and two
Switch,
Three LED are respectively the 3rd LED, the 4th LED and the 5th LED, the cathode and the 4th LED of the 3rd LED
Anode connection, the cathode of the 4th LED connect with the positive of the 5th LED, positive and described the of the 3rd LED
The cathode of five LED is connect with the high voltage end, low-voltage end respectively；
Described two switches are respectively third switch and the 4th switch, and third switch is in parallel with the 3rd LED, and described the
Four switches are in parallel with the both ends of the 4th LED and the 5th LED being connected in series；
Alternatively, third switch is in parallel with the 5th LED, the 3rd LED of the 4th switch and series connection and
The both ends of 4th LED are in parallel.
10. LED drive circuit according to claim 9, which is characterized in that the first voltage value is minimum voltage etc.
Grade, the third voltage value are maximum voltage grade, and the second voltage value is in minimum voltage levels and maximum voltage grade
Between, first current value is maximum current, and it is institute that second current value, which is in minimum current and the centre of maximum current,
The half of the first current value is stated, the third current value is the one third that minimum current is first current value,
In the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, it is disconnected that the LED structure control circuit controls the third switch
It opens and the 4th closes the switch, the driving current is adjusted to first current value by the driving current generation circuit；
When the busbar voltage reaches the second voltage value, the LED structure control circuit controls the third switch and closes
It closes and the 4th switch disconnects, the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches the third voltage value, the LED structure control circuit control the third switch and
4th switch disconnects, and the driving current is adjusted to the third current value by the driving current generation circuit；
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, it is disconnected that the LED structure control circuit controls the third switch
It opens and the 4th closes the switch, the driving current is adjusted to the third current value by the driving current generation circuit；
When the busbar voltage reaches the second voltage value, the LED structure control circuit controls the third switch and closes
It closes and the 4th switch disconnects, the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches the third voltage value, the LED structure control circuit control the third switch and
4th switch disconnects, and the driving current is adjusted to first current value by the driving current generation circuit.
11. LED drive circuit according to claim 6, which is characterized in that the LED array includes three LED and four
Switch,
Three LED are respectively the 6th LED, the 7th LED and the 8th LED, the cathode and the 7th LED of the 6th LED
Anode connection, the cathode of the 7th LED connect with the positive of the 8th LED, positive and described the of the 6th LED
The cathode of eight LED is connect with the high voltage end, low-voltage end respectively；
Four switches include the 5th switch, the 6th switch, the 7th switch and the 8th switch, the 5th switch and described the
Six LED are in parallel, and the 7th switch is in parallel with the 8th LED, the 7th LED of the 6th switch and series connection and
The both ends of 8th LED are in parallel, and the 8th switch is in parallel with the both ends of the 6th LED and the 7th LED being connected in series.
12. LED drive circuit according to claim 11, which is characterized in that the 7th switch and the 8th switch are always
It disconnects, the first voltage value is minimum voltage levels, and the third voltage value is maximum voltage grade, the second voltage value
Between minimum voltage levels and maximum voltage grade, first current value is maximum current, at second current value
It is the half of first current value in the centre of minimum current and maximum current, the third current value is minimum current
The one third of as described first current value,
In the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, LED structure control circuit control the 5th switch disconnect and
6th closes the switch, and the driving current is adjusted to first current value by the driving current generation circuit；
When the busbar voltage reaches second voltage value, LED structure control circuit control the described 5th close the switch and
6th switch disconnects, and the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches third voltage value, LED structure control circuit control the 5th switch and the 6th
Switch disconnects, and the driving current is adjusted to the third current value by the driving current generation circuit；
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, LED structure control circuit control the 5th switch disconnect and
6th closes the switch, and the driving current is adjusted to the third current value by the driving current generation circuit；
When the busbar voltage reaches second voltage value, LED structure control circuit control the described 5th close the switch and
6th switch disconnects, and the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches third voltage value, LED structure control circuit control the 5th switch and the 6th
Switch disconnects, and the driving current is adjusted to first current value by the driving current generation circuit.
13. LED drive circuit according to claim 11, which is characterized in that the 5th switch and the 6th switch are always
It disconnects, the first voltage value is minimum voltage levels, and the third voltage value is maximum voltage grade, the second voltage value
Between minimum voltage levels and maximum voltage grade, first current value is maximum current, at second current value
It is the half of first current value in the centre of minimum current and maximum current, the third current value is minimum current
The one third of as described first current value,
In the case where the output power of the LED drive circuit is firm power:
When the busbar voltage reaches the first voltage value, LED structure control circuit control the 7th switch disconnect and
8th closes the switch, and the driving current is adjusted to the third current value by the driving current generation circuit；
When the busbar voltage reaches second voltage value, LED structure control circuit control the described 7th close the switch and
8th switch disconnects, and the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches third voltage value, LED structure control circuit control the 7th switch and the 8th
Switch disconnects, and the driving current is adjusted to first current value by the driving current generation circuit；
In the case where the LED drive circuit has High Power Factor value:
When the busbar voltage reaches the first voltage value, LED structure control circuit control the 7th switch disconnect and
8th closes the switch, and the driving current is adjusted to first current value by the driving current generation circuit；
When the busbar voltage reaches second voltage value, LED structure control circuit control the described 7th close the switch and
8th switch disconnects, and the driving current is adjusted to second current value by the driving current generation circuit；
When the busbar voltage reaches third voltage value, LED structure control circuit control the 7th switch and the 8th
Switch disconnects, and the driving current is adjusted to the third current value by the driving current generation circuit.
14. LED drive circuit according to claim 1, which is characterized in that the LED array is connected to the driving electricity
Flow the output end of generation circuit；The LED array includes n LED, and the switch includes that (n-1) organizes switching group, each switching group
Two switches including being connected in series in the output end of the driving current generation circuit；The points of common connection of described two switches
It is sequentially connected to the points of common connection of two adjacent LED.
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| CN201610264785.2A CN105792439B (en) | 2013-09-29 | 2013-09-29 | LED drive circuit |
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| CN201610264785.2A CN105792439B (en) | 2013-09-29 | 2013-09-29 | LED drive circuit |
| CN201310460841.6A CN103501562A (en) | 2013-09-29 | 2013-09-29 | LED (Light Emitting Diode) drive circuit |
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| CN106941747A (en) * | 2017-04-07 | 2017-07-11 | 南京中感微电子有限公司 | A kind of LED circuit and LED drive circuit |
| CN211557553U (en) * | 2019-06-06 | 2020-09-22 | 上海路傲电子科技有限公司 | Chip driving circuit, chip, linear constant current driving circuit and lighting device |
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| CN101137261A (en) * | 2006-08-29 | 2008-03-05 | 安华高科技Ecbuip(新加坡)私人有限公司 | Device and method for driving LED |
| WO2011139624A1 (en) * | 2010-05-07 | 2011-11-10 | Cree, Inc. | Ac driven solid state lighting apparatus with led string including switched segments |
| CN102498449A (en) * | 2009-06-04 | 2012-06-13 | 普英森亿有限责任公司 | Apparatus, method and system for providing AC line power to lighting devices |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101137261A (en) * | 2006-08-29 | 2008-03-05 | 安华高科技Ecbuip(新加坡)私人有限公司 | Device and method for driving LED |
| CN102498449A (en) * | 2009-06-04 | 2012-06-13 | 普英森亿有限责任公司 | Apparatus, method and system for providing AC line power to lighting devices |
| WO2011139624A1 (en) * | 2010-05-07 | 2011-11-10 | Cree, Inc. | Ac driven solid state lighting apparatus with led string including switched segments |
| CN102870501A (en) * | 2010-05-07 | 2013-01-09 | 克里公司 | AC driven solid state lighting apparatus with LED string including switched segments |
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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. |