CN106851922A - A kind of linear Constant-power LED drive circuit, chip and constant-current LED control system - Google Patents
A kind of linear Constant-power LED drive circuit, chip and constant-current LED control system Download PDFInfo
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- CN106851922A CN106851922A CN201710189193.3A CN201710189193A CN106851922A CN 106851922 A CN106851922 A CN 106851922A CN 201710189193 A CN201710189193 A CN 201710189193A CN 106851922 A CN106851922 A CN 106851922A
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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]
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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
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- 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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Abstract
A kind of linear Constant-power LED drive circuit, chip and constant-current LED control system, including：Constant-current control module, gauze detection module, power limitation control module, gauze detection module are used to sample gauze input voltage and be exported sampled voltage, and clamp voltage is exported when sampled voltage reaches clamp voltage；Power limitation control module is used for the output voltage to constant-current control module according to sampled voltage regulation output, with the output current for adjusting constant-current control module make LED load input power keep it is constant, and by clamp voltage controlled output to constant-current control module minimum output voltage so that constant-current control module output current for controllable silicon extinction current.The present invention can reach input voltage and change and the constant effect of input power, and ensure that the normal use of controllable silicon light modulation.
Description
Technical field
The present invention relates to LED drive circuit technical field, more particularly to a kind of linear Constant-power LED drive circuit, chip
And system.
Background technology
With cognitive lifting of the mankind on energy-saving and environment friendly, the following industrial prospect related to environment protecting and power-saving
Development potentiality is huge, possess popular industry LED semiconductor technologies will turn into most have one of high-technology field of development potentiality.
LED as a kind of new type light source, because it possess that brightness is strong, energy consumption is low and long lifespan advantage be widely used in each neck
Domain.Linear constant current technical scheme is widely used with its simple system architecture in middle low power LED constant current system.
Linear controllable silicon light modulation constant current scheme common at present, as depicted in figs. 1 and 2, including rectification circuit, vent discharge
Road, constant-current control module and LED load, its constant current output are Iout=Vref/Rcs.The shortcoming of this application scheme is to be
The quantity of load LED lamp of uniting must be designed in strict accordance with input voltage, and the change of input voltage can cause whole system to be input into
The change of power, so as to influence the efficiency of system and the light efficiency of LED.Such as one 220VAC is input into the linear of 7W power
LED constant current system, when input voltage increases to 240V, input power may rise to 8W, and during 260V inputs, input power
9W is then risen to, the light efficiency of efficiency and LED is greatly reduced.
As fully visible, the change that there is input voltage in the prior art can cause the change of whole system input power, from
And influence the problem of the efficiency of system and the light efficiency of LED.
The content of the invention
The technical problem to be solved in the present invention is that the above-mentioned input voltage change for prior art causes system power
The defect of change, influence system effectiveness and LED light efficiency, there is provided when one kind supports that controllable silicon light modulation scheme, input voltage change
Linear Constant-power LED drive circuit, chip and constant-current LED control system that system power is held essentially constant.
The technical solution adopted for the present invention to solve the technical problems is：A kind of linear Constant-power LED drive circuit is constructed,
Including：
Constant-current control module, for being connected with LED load；
Gauze detection module, for being sampled to gauze input voltage and is exported sampled voltage, and in sampled voltage
Clamp voltage is exported when reaching clamp voltage；
Power limitation control module, for being exported to the output voltage of constant-current control module according to sampled voltage regulation, to adjust
Saving the output current of constant-current control module makes the input power of the LED load keep constant, and by the clamp voltage
Controlled output to constant-current control module minimum output voltage so that constant-current control module output current for controllable silicon most
Small maintenance electric current.
Optionally, the gauze detection module includes：
Bleeder circuit, for carrying out partial pressure sampling to gauze input voltage, and generates sampled voltage；
Clamp circuit, for exporting clamp voltage when sampled voltage reaches clamp voltage, the clamp voltage is to work as line
The sampled voltage corresponding to gauze input voltage when the electric current of net is the extinction current of controllable silicon.
Optionally, clamp circuit includes Zener diode, and bleeder circuit includes first resistor and second resistance, first resistor
First end receive gauze input voltage as the power input of drive circuit, the second end of first resistor connects Zener simultaneously
The negative pole of diode, the first end of second resistance and power limitation control module, the positive pole of the Zener diode and second
Second end of resistance is grounded simultaneously.
Optionally, power limitation control module includes：
Voltage detecting circuit, for detecting the sampled voltage；
Voltage comparator circuit, when the sampled voltage is less than constant current reference voltage using constant current reference voltage as output electricity
Pressure, makes output voltage be reduced with the rising of sampled voltage when sampled voltage is more than constant current reference voltage, and in sampling electricity
It is minimum output voltage to press output voltage during for clamp voltage.
Optionally, the voltage detecting circuit includes the first operational amplifier and first switch pipe；First computing is put
The in-phase input end of big device accesses the sampled voltage, and the output end of first operational amplifier connects the first switch pipe
Control end, the input connection high level voltage of the first switch pipe, the output end connection of the first switch pipe is described
The out-phase input and the voltage comparator circuit of the first operational amplifier.
Optionally, voltage comparator circuit includes 3rd resistor, the 4th resistance and the second operational amplifier；3rd resistor
First end connects the voltage detecting circuit, and the out-phase of the second end connection second operational amplifier of the 3rd resistor is defeated
Enter the first end of end and the 4th resistance, the in-phase input end of the second operational amplifier receives the constant current reference voltage, the 4th electricity
Second end of resistance connects the output end and constant-current control module of the second operational amplifier.
Optionally, constant-current control module include the 3rd operational amplifier and second switch pipe, the 3rd operational amplifier it is same
Phase input connects the power limitation control module, the input of second switch pipe as the drive circuit power input
Receive gauze input voltage, the control end of second switch pipe connects the output end of the 3rd operational amplifier, second switch pipe it is defeated
Go out the out-phase input of the 3rd operational amplifier of end connection and the constant current as drive circuit sets end, the constant current sets end warp
Cross a constant current and resistance eutral grounding is set.
The invention also discloses a kind of linear invariable power LED drive chip, including power input OUT, constant current, end is set
REXT, GND end, the chip internal are provided with described linear Constant-power LED drive circuit.
The invention also discloses a kind of constant-current LED control system, including rectification circuit, leadage circuit, described linear perseverance
Power LED drive circuit.
Implement linear Constant-power LED drive circuit of the invention, have the advantages that：Due to invariable power control of the present invention
Molding block can be exported to the output voltage of constant-current control module according to sampled voltage regulation, and then can adjust current constant control mould
The output current of block, is finally reached input voltage and changes and the constant effect of input power；Meanwhile, reach clamper in sampled voltage
During voltage, power limitation control module export to the minimum output voltage of constant-current control module can make output current for controllable silicon most
Small maintenance electric current, it is ensured that the normal use of controllable silicon light modulation.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings：
Fig. 1 is a kind of structural representation of the invariable power linear constant current LED drive circuit for providing in the prior art；
Fig. 2 is the structural representation of another invariable power linear constant current LED drive circuit for providing in the prior art；
Fig. 3 is the module frame chart of the preferred embodiment of linear Constant-power LED drive circuit of the invention；
Fig. 4 is the circuit diagram of the preferred embodiment of linear Constant-power LED drive circuit of the invention.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give exemplary embodiments of the invention.But, the present invention can be realized in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose that these embodiments are provided be make to the disclosure more it is thorough comprehensively.
It should be noted that word " equal ", " identical " " while " or other similar terms, be not limited to mathematical term
In it is absolute equal or identical, can be close on engineering significance or acceptable when right described in this patent is implemented
Error range in.Word " connected " or " connection ", not only including two entities are joined directly together, also including by with having
Other entities of beneficial improvement are indirectly connected to.
Unless otherwise defined, all of technologies and scientific terms used here by the article with belong to technical field of the invention
The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more phases
The arbitrary and all of combination of the Listed Items of pass.
The total thinking of the present invention is：On the one hand, exported to the output voltage of constant-current control module according to sampled voltage regulation,
And then can adjust the output current of constant-current control module, the constant effect of input power to reach input voltage change；Separately
On the one hand, when clamp voltage is reached in sampled voltage, output current is no longer allowed to change with the change of input voltage, but
Will be imparted to constant-current control module output voltage be limited in minimum output voltage, and then make output current for controllable silicon most
Small maintenance electric current, it is ensured that the normal use of controllable silicon light modulation.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to upper
State technical scheme to be described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the application
The detailed description of technical scheme, rather than the restriction to technical scheme, in the case where not conflicting, the present invention is implemented
Technical characteristic in example and embodiment can be mutually combined.
With reference to Fig. 1, linear Constant-power LED drive circuit of the invention includes：
Constant-current control module 3, for being connected with LED load, LED load is LED1-LEDn such as in figure.
Gauze detection module 1, for being sampled to gauze input voltage and is exported sampled voltage, and in sampled voltage
Clamp voltage is exported when reaching clamp voltage；
Power limitation control module 2, for being exported to the output voltage of constant-current control module 3 according to sampled voltage regulation, with
Adjusting the output current of constant-current control module 3 makes the input power of the LED load keep constant, and by clamper electricity
Press controlled output to the minimum output voltage of constant-current control module 3 so that the output current of constant-current control module 3 is controllable silicon
Extinction current.
It should be noted that the position of the sampling of gauze detection module 1 is not limited to the negative pole of the LED load shown in figure,
The other positions in the positive pole or concatenation path of LED load are can also be, these are all simple deformations of the invention, all at this
Within the protection domain of invention.In addition, constant-current control module 3 can also be arranged on the side of the positive electrode of LED load, or LED1-
Between any two LED inside LEDn, this is not limited.
With reference to Fig. 3-Fig. 4, gauze detection module described in the present embodiment 1 includes：Bleeder circuit 11, for being input into gauze
Voltage carries out partial pressure sampling, and generates sampled voltage；Clamp circuit 12, for exporting pincers when sampled voltage reaches clamp voltage
Position voltage, the clamp voltage is corresponding to the gauze input voltage when the electric current of gauze is the extinction current of controllable silicon
Sampled voltage.
In the present embodiment, the power limitation control module 2 includes：Voltage detecting circuit 21, for detecting the sampling electricity
Pressure；Voltage comparator circuit 22, constant current reference voltage V is less than in the sampled voltagerefWhen by constant current reference voltage VrefAs defeated
Go out voltage, constant current reference voltage V is more than in sampled voltagerefWhen output voltage is reduced with the rising of sampled voltage, and
The output voltage is minimum output voltage when sampled voltage is clamp voltage.
Specifically, clamp circuit 12 includes Zener diode Z1, bleeder circuit 11 includes resistance R1 and resistance R2, voltage inspection
Slowdown monitoring circuit 21 includes operational amplifier U1 and switching tube Q1, and voltage comparator circuit 22 is put including resistance R3, resistance R4 and computing
Big device U2, constant-current control module 3 includes operational amplifier U3 and switching tube Q2.
The first end of resistance R1 receives gauze input voltage, second end of resistance R1 as the power input of drive circuit
The in-phase input end of the negative pole, the first end of resistance R2 and operational amplifier U1 of Zener diode Z1 is connected simultaneously, it is described neat
Receive diode Z1 positive pole and resistance R2 the second end simultaneously be grounded.The output end of operational amplifier U1 connects the switching tube
The control end of Q1, the input connection high level voltage of the switching tube Q1, the output end of the switching tube Q1 connects the fortune
The out-phase input of amplifier U1 and the first end of resistance R3 are calculated, second end of the resistance R3 connects the operational amplifier
The out-phase input of U2 and the first end of resistance R4, the in-phase input end of operational amplifier U2 receive the constant current reference voltage
Vref, the output end and the in-phase input end of operational amplifier U3 of the second end concatenation operation amplifier U2 of resistance R4, switching tube
The first end of the input connection resistance R1 of Q2, the output end of the control end concatenation operation amplifier U3 of switching tube Q2, switching tube
The out-phase input of the output end concatenation operation amplifier U3 of the Q2 and constant current as drive circuit sets end, the constant current is set
End sets resistance R by a constant currentEXT1Ground connection.
It should be noted that switching tube includes various equivalent switch electronic devices, diode or triode are not limited to.
The operation principle of the present embodiment is summarized as follows：Resistance R1 and R2 partial pressure are sampled, the voltage V of R2 first endsTAs adopt
Sample voltage, when line voltage reaches LED load conduction voltage drop：If 1) VT＜ Vref, U1 causes that Q1 ends, U2 outputs Vref, i.e.,
Output voltage is Vref, now LED load is with Vref/REXT1Constant current operation；If 2) VT≥Vref, U1 causes Q1 to turn on and export
VT, output voltage is Vref- (VT- Vref) * R4/R3, i.e., now LED load withElectric current
Work, it is seen that now output voltage is with sampled voltage VTIncrease and reduce, now LED load for step-down work；If 3) VT≥
VZ1When, Z1 reverse breakdowns, VTKeep VZ1Output, therefore it is Vref-R4/R3* (V that now output voltage is constantZ1- Vref), now
LED load withCurrent work, this electric current is the extinction current of controllable silicon.
Based on same inventive concept, the present invention is also claimed a kind of driving chip, and with reference to Fig. 4, chip includes that power supply is defeated
Enter to hold OUT, constant current that end REXT, GND end is set, the chip internal sets drive circuit.When using the chip, can pass through
One constant current of connection sets resistance R between constant current sets end REXT, GND end againEXT1, constant current setting resistance REXT1Resistance it is big
Small decision constant current value.
Based on same inventive concept, the present invention is also claimed a kind of constant-current LED control system, including rectification circuit, lets out
Electric discharge road, the drive circuit.As in Fig. 4, rectification circuit includes a rectifier bridge, LED load one electric capacity C1 of parallel connection, rectifier bridge
Positive output end is connected by a diode D1 with LED load positive pole, and LED load negative pole is connected to the power input of drive circuit
OUT, leadage circuit includes a constant current chip, and the OUT terminal of constant current chip and GND ends connect the positive output end of rectifier bridge, bear respectively
Output end, the REXT ends of constant current chip pass through a resistance REXT2The constant current for connecting drive circuit sets end REXT.
Invariable power effect of the invention is illustrated with a specific example below.
As shown in figure 4, Vac is alternating current, frequency is 60Hz, LED voltage VLED=130V, capacitor's capacity is 6.8uF,
REXT1=13 Ω, REXT2=36 Ω, R1/R2=300/24, R3/R4=1/0.7, Vref=0.9V, chip U4REXT port VREXT2
=0.6V, Zener breakdown voltage is VZ1=1.70V.When gauze voltage is less than VLEDWhen, leadage circuit works, and output current is
VREXT2/REXT2；When gauze voltage is more than VLEDWhen, drive circuit is started working, meanwhile, close leakage current.Work as VTVoltage is more than
VrefWhen, VREXT1Start to reduce as OUT terminal mouthful voltage is raised；Work as VTWhen voltage reaches Zener breakdown voltage, VREXT1Keep
It is constant, not with OUT voltage changes.In a cycle (π), input power is made up of four parts altogether：
A:Release power
B:Constant-current power
C:Buck power
D:Constant pressure power
Wherein, vpp is input gauze crest voltage, and w is input gauze voltage angle frequency, Input general power is：
PIN=(PA+PB+PC+PC)/π (5)
By formula (1) to (5), input power such as following table when can obtain input voltage for 108V, 120V, 132V：
| VIN(Vac) | 108 | 120 | 132 |
| 3.72 | 3.82 | 3.68 |
Can be drawn by upper table, in input voltage change+- 10%, input power change turns to -3.7% and -2.7%.
Meanwhile, the minimum value of the output voltage at REXT ends is VREXT_MIN=Vref-R4/R3* (VZ1- Vref)=0.34V,
So minimum output current is I_MIN=VREXT_MIN/REXT1=0.34/13=26.2mA, meets controllable silicon light modulation minimum current
It is required that.
In sum, implement linear Constant-power LED drive circuit of the invention, have the advantages that：Due to this hair
Bright power limitation control module can be exported to the output voltage of constant-current control module according to sampled voltage regulation, and then can be adjusted
The output current of constant-current control module, is finally reached input voltage and changes and the constant effect of input power；Meanwhile, in sampling electricity
Pressure is when reaching clamp voltage, and power limitation control module is exported can make the output current be to the minimum output voltage of constant-current control module
The extinction current of controllable silicon, it is ensured that the normal use of controllable silicon light modulation.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Implementation method, above-mentioned specific embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under enlightenment of the invention, in the case of present inventive concept and scope of the claimed protection is not departed from, can also make a lot
Form, these are belonged within protection of the invention.
Claims (9)
1. a kind of linear Constant-power LED drive circuit, it is characterised in that including：
Constant-current control module, for being connected with LED load；
Gauze detection module, for being sampled to gauze input voltage and is exported sampled voltage, and is reached in sampled voltage
Clamp voltage is exported during clamp voltage；
Power limitation control module, for being exported to the output voltage of constant-current control module, to adjust perseverance according to sampled voltage regulation
The output current of flow control module makes the input power of the LED load keep constant, and is controlled by the clamp voltage
The minimum output voltage to constant-current control module is exported so that the output current of constant-current control module is the minimum dimension of controllable silicon
Hold electric current.
2. linear Constant-power LED drive circuit according to claim 1, it is characterised in that the gauze detection module bag
Include：
Bleeder circuit, for carrying out partial pressure sampling to gauze input voltage, and generates sampled voltage；
Clamp circuit, for exporting clamp voltage when sampled voltage reaches clamp voltage, the clamp voltage is when gauze
The sampled voltage corresponding to gauze input voltage when electric current is the extinction current of controllable silicon.
3. linear Constant-power LED drive circuit according to claim 2, it is characterised in that clamp circuit includes Zener two
Pole pipe, bleeder circuit includes first resistor and second resistance, the first end of first resistor as drive circuit power input
Receive gauze input voltage, the second end of first resistor connect simultaneously the negative pole of Zener diode, the first end of second resistance with
And power limitation control module, the positive pole of the Zener diode and the second end of second resistance are grounded simultaneously.
4. linear Constant-power LED drive circuit according to claim 1, it is characterised in that power limitation control module includes：
Voltage detecting circuit, for detecting the sampled voltage；
Voltage comparator circuit, when the sampled voltage is less than constant current reference voltage using constant current reference voltage as output voltage,
Output voltage is reduced with the rising of sampled voltage when sampled voltage is more than constant current reference voltage, and be in sampled voltage
The output voltage is minimum output voltage during clamp voltage.
5. linear Constant-power LED drive circuit according to claim 4, it is characterised in that the voltage detecting circuit bag
Include the first operational amplifier and first switch pipe；
The in-phase input end of first operational amplifier accesses the sampled voltage, the output end of first operational amplifier
Connect the control end of the first switch pipe, the input connection high level voltage of the first switch pipe, the first switch
The output end of pipe connects the out-phase input and the voltage comparator circuit of first operational amplifier.
6. linear Constant-power LED drive circuit according to claim 4, it is characterised in that voltage comparator circuit includes the
Three resistance, the 4th resistance and the second operational amplifier；
The first end of 3rd resistor connects the voltage detecting circuit, and the second end of the 3rd resistor connects second computing
The out-phase input of amplifier and the first end of the 4th resistance, the in-phase input end of the second operational amplifier receive the constant current base
Quasi- voltage, the second end of the 4th resistance connects the output end and constant-current control module of the second operational amplifier.
7. linear Constant-power LED drive circuit according to claim 1, it is characterised in that constant-current control module includes the
Three operational amplifiers and second switch pipe,
The in-phase input end of the 3rd operational amplifier connects the power limitation control module, and the input of second switch pipe is used as institute
The power input for stating drive circuit receives gauze input voltage, and the control end of second switch pipe connects the 3rd operational amplifier
Output end, the output end of second switch pipe connects the out-phase input of the 3rd operational amplifier and the constant current as drive circuit sets
End is put, the constant current sets end and sets resistance eutral grounding by a constant current.
8. a kind of linear invariable power LED drive chip, it is characterised in that including power input OUT, constant current set end REXT,
GND ends, the chip internal is set just like the linear Constant-power LED drive circuit described in claim any one of 1-7.
9. a kind of constant-current LED control system, it is characterised in that any including rectification circuit, leadage circuit, such as claim 1-7
Linear Constant-power LED drive circuit described in.
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| CN107820344B (en) * | 2017-10-27 | 2024-04-23 | 厦门阳光恩耐照明有限公司 | Emergency module |
| CN108834259B (en) * | 2018-07-11 | 2024-04-05 | 深圳市明微电子股份有限公司 | Linear constant current control circuit and method for LED lamp and LED device |
| CN108834259A (en) * | 2018-07-11 | 2018-11-16 | 深圳市明微电子股份有限公司 | For the linearity constant current control circuit of LED light, method and LED matrix |
| CN109526106A (en) * | 2018-12-20 | 2019-03-26 | 厦门市必易微电子技术有限公司 | A kind of driving circuit, LED drive system and current control method |
| CN109526106B (en) * | 2018-12-20 | 2024-05-14 | 厦门市必易微电子技术有限公司 | Driving circuit, LED driving system and current control method |
| CN110012573A (en) * | 2019-04-04 | 2019-07-12 | 深圳市明微电子股份有限公司 | A kind of full voltage control circuit |
| CN110896279A (en) * | 2019-10-12 | 2020-03-20 | 深圳市伟鹏世纪科技有限公司 | LED emergency power supply constant power output circuit and working method |
| CN110896279B (en) * | 2019-10-12 | 2022-12-23 | 深圳市伟鹏世纪科技有限公司 | LED emergency power supply constant power output circuit and working method |
| CN110582144A (en) * | 2019-10-14 | 2019-12-17 | 深圳市明微电子股份有限公司 | adaptive bleeding control circuit and method |
| CN113806269A (en) * | 2021-09-14 | 2021-12-17 | 深圳群芯微电子有限责任公司 | USB port constant voltage power supply circuit |
| CN114205953B (en) * | 2021-12-13 | 2023-11-03 | 英飞特电子（杭州）股份有限公司 | LED lamp driving system |
| CN114205953A (en) * | 2021-12-13 | 2022-03-18 | 英飞特电子（杭州）股份有限公司 | LED lamp driving system |
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