CN208623943U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
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- CN208623943U CN208623943U CN201820526544.5U CN201820526544U CN208623943U CN 208623943 U CN208623943 U CN 208623943U CN 201820526544 U CN201820526544 U CN 201820526544U CN 208623943 U CN208623943 U CN 208623943U
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Abstract
The utility model discloses a kind of Light-emitting diode LED driving circuit, which includes: voltage regulator circuit, circuit for power conversion and drive control chip；Wherein, the corresponding transformer of voltage regulator circuit transformer corresponding with circuit for power conversion is identical；Drive control chip, for sending regulated voltage signal to voltage regulator circuit to circuit for power conversion transmitting power control signal；Circuit for power conversion, for DC power signal to be converted to the out-put supply signal for meeting predetermined power according to power control signal；Voltage regulator circuit, the direct current for keeping output voltage constant according to regulated voltage signal.The volume for reducing LED drive circuit while output high-power may be implemented in LED drive circuit provided by the embodiment of the utility model.
Description
Technical field
The utility model embodiment is related to light emitting diode LED lighting technology more particularly to a kind of LED drive circuit.
Background technique
Currently, LED light source is as a kind of common alternative source of light, utilization more and more in people's lives, such as: lamp
Alveolar sphere, ceiling lamp, downlight, Frame lamp etc. are widely used in household, corridor, building corridor, washing house etc., and LED light source is due to it
The advantages such as high-luminous-efficiency, long service live, color true to nature, environmental protection, gradually substituting traditional incandescent lamp in Zhao Ming
In application.
With the extensive use of LED, LED actuation techniques are also increasingly mature.LED drive circuit is used to export to LED load
To drive LED light to work normally, LED drive circuit mainly includes voltage regulator circuit, circuit for power conversion and control electricity for constant current
Road.The main switch that control circuit is used to control in circuit for power conversion is intermittently connected, so that circuit for power conversion be made to connect
The input voltage signal received is converted into constant current signal and exports to LED load, and voltage regulator circuit is for making output voltage values
It is constant.In voltage regulator circuit and circuit for power conversion, inductance element is essential.
In the process of implementing the utility model, at least there are the following problems in the prior art for utility model people discovery:
When LED drive circuit output power it is very high when, it usually needs inductance element it is sufficiently bulky.It results in this way
LED drive circuit it is sufficiently bulky.
Utility model content
The utility model provides a kind of LED drive circuit, reduces LED drive circuit while to realize output high-power
Volume.
The utility model embodiment proposes a kind of Light-emitting diode LED driving circuit, comprising: voltage regulator circuit, power
Conversion circuit and drive control chip；Wherein, the corresponding transformer of the voltage regulator circuit and the circuit for power conversion pair
The transformer answered is identical；
The drive control chip is used for the circuit for power conversion transmitting power control signal, Xiang Suoshu voltage tune
Economize on electricity road transmission regulated voltage signal；
The circuit for power conversion, it is default for DC power signal to be converted to satisfaction according to the power control signal
The out-put supply signal of power；
The voltage regulator circuit, the direct current for keeping output voltage constant according to the regulated voltage signal.
LED drive circuit provided by the embodiment of the utility model is sent by drive control chip to circuit for power conversion
Power control signal sends regulated voltage signal to voltage regulator circuit；Circuit for power conversion, will be straight according to power control signal
Galvanic electricity source signal is converted to the out-put supply signal for meeting predetermined power；Voltage regulator circuit, for according to regulated voltage signal
Make the direct current that output voltage is constant, the corresponding transformer of voltage regulator circuit and the corresponding transformer phase of circuit for power conversion
Together.LED drive circuit provided by the embodiment of the utility model may be implemented to reduce LED drive circuit while output high-power
Volume.
Detailed description of the invention
Fig. 1 is the block diagram of the LED drive circuit in the utility model embodiment one；
Fig. 2 is the block diagram of the LED drive circuit in the utility model embodiment one；
Fig. 3 is the circuit diagram of the LED drive circuit in the utility model embodiment two；
Fig. 4 a is the main view of the transformer in the utility model embodiment two；
Fig. 4 b is the top view of the transformer in the utility model embodiment two.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is the block diagram of the LED drive circuit in the utility model embodiment one；The present embodiment is applicable to driving LED
The case where fluorescent tube, as shown in Figure 1, the LED drive circuit, comprising: voltage regulator circuit 110, circuit for power conversion 130 and driving
Control chip 120；Wherein, the corresponding transformer of voltage regulator circuit 110 and the corresponding transformer phase of circuit for power conversion 130
Together.
Drive control chip 120 is used for 130 transmitting power control signal of circuit for power conversion, to voltage regulator circuit
110 send regulated voltage signal；Circuit for power conversion 130, for being converted to DC power signal according to power control signal
Meet the out-put supply signal of predetermined power；Voltage regulator circuit 120, for keeping output voltage permanent according to regulated voltage signal
Fixed direct current.
Further, Fig. 2 is the block diagram of the LED drive circuit in the utility model embodiment one；As shown in Fig. 2, LED drives
Dynamic circuit specifically includes that input circuit 20, circuit for power conversion 30, output circuit 40, drive control chip start-up circuit 50, electricity
Voltage regulator circuit 60, drive control chip 70 and current feedback circuit 80；Wherein, input circuit 20 includes: fuse 201, EMC
Filter circuit 202, rectification circuit 203, π type filter circuit 204.
Input circuit 20, for mains supply signal to be converted to the corresponding DC power signal of circuit for power conversion；It is molten
Disconnected device 201 is connect with mains supply, when being more than preset value for the electric current in LED drive circuit, the connection of disconnecting circuit；
The input terminal of EMC filter circuit 202 is connect with fuse 201, for inhibiting mains supply dry to the high frequency of LED drive circuit
It disturbs.The input terminal of rectification circuit 203 is connect with the output end of EMC filter circuit 202, for converting alternating current to pulsating direct current
Electricity；The input terminal of π type filter circuit 204 is connect with the output end of rectification circuit 203, for being converted to smoothly Rectified alternating current
Direct current.
Current feedback circuit 80, for acquiring the output electric current of output circuit and feeding back to drive control chip；Output electricity
Road 40 is connect for the load with LED light, and the out-put supply signal that circuit for power conversion exports is filtered, and is driven
The load of LED light.Drive control chip start-up circuit 50 makes to drive for being the suitable supply voltage of drive control chip 70
Chip 70 is controlled to work normally.
Drive control chip 70 is used for 30 transmitting power control signal of circuit for power conversion, to voltage regulator circuit 60
Send regulated voltage signal；Circuit for power conversion 30, for DC power signal to be converted to satisfaction according to power control signal
The out-put supply signal of predetermined power；Voltage regulator circuit 60, for keeping output voltage constant according to regulated voltage signal
Direct current.
LED drive circuit provided by the embodiment of the utility model is sent by drive control chip to circuit for power conversion
Power control signal sends regulated voltage signal to voltage regulator circuit；Circuit for power conversion, will be straight according to power control signal
Galvanic electricity source signal is converted to the out-put supply signal for meeting predetermined power；Voltage regulator circuit, for according to regulated voltage signal
Make the direct current that output voltage is constant, the corresponding transformer of voltage regulator circuit and the corresponding transformer phase of circuit for power conversion
Together.LED drive circuit provided by the embodiment of the utility model may be implemented to reduce LED drive circuit while output high-power
Volume.
Embodiment two
Fig. 3 is the circuit diagram of the LED drive circuit in the utility model embodiment two, and the present embodiment is in the various embodiments described above
On the basis of, preferably LED drive circuit is optimized.
As shown in figure 3, fuse includes first fuse F1 and second fuse F2, the first end of first fuse F1 with
The anode connection of mains supply, the second end of first fuse F2 and the cathode of mains supply connect, and mainly drive electricity in LED
When electric current in road is more than preset value, the connection of disconnecting circuit.When temperature is more than 125 degrees Celsius, first fuse F1 or second
Fuse F2 fusing, and then the input of mains supply is cut off, play the role of protecting electric ballast and LED lamp tube.First is molten
For disconnected device F1 and second fuse F2 for carrying out overheat protector, preventing temperature when fluorescent tube overcurrent inside lamp cap is more than 125 Celsius
Degree.
The second end of first fuse F1 is connected with the second end of second fuse F2 by varistor MOV1, pressure-sensitive electricity
Hindering MOV1 main function is the damage caused by prevented because of static discharge, surge and other transient currents to circuit.When the electricity of input
When the voltage instantaneous of source signal is higher than a certain numerical value, the resistance value of varistor MOV1 declines rapidly, high current is connected, and then protect
LED drive circuit and LED lamp tube.When the voltage of the power supply signal of input is for varistor MOV1, varistor MOV1's
Resistance value is high, and approximation open circuit will not influence the normal work of LED drive circuit and LED lamp tube.
EMC filter circuit specifically includes that the second common mode inductance LF2 and third common mode inductance LF3.Second common mode inductance LF2
The first Same Name of Ends connect with the second end of first fuse F1, the second Same Name of Ends of the second common mode inductance LF2 and second fusing
The second end of device F2 connects, and the first different name end of the second common mode inductance LF2 and the first Same Name of Ends of third common mode inductance LF3 connect
It connects, the second different name end of the second common mode inductance LF2 is connect with the second Same Name of Ends of third common mode inductance LF3.Third common mode inductance
The first different name end of LF3 and the first input end of rectification circuit connect, the second different name end of third common mode inductance LF3 and rectified current
Second input terminal on road connects.EMC filter circuit is for inhibiting mains supply to the High-frequency Interference and strong electromagnetic of LED drive circuit
Field interference.
Rectification circuit includes: the 4th diode D4, the 5th diode D5, the 6th diode D6 and the 7th diode D7.The
The cathode of four diode D4 is connect with the cathode of the 5th diode D5, the anode of the 6th diode D6 and the sun of the 7th diode D7
Pole is grounded respectively；The anode of 4th diode D4 respectively with the anode of the 7th diode D7 and third common mode inductance LF3 first
The connection of different name end, the anode of the 5th diode D5 respectively with the anode of the 6th diode D6 and third common mode inductance LF3 second
Different name end connection, for the mains supply of exchange to be converted to the direct current of pulsation.
π type filter circuit includes: the first inductance L1, the 16th resistance R16, the 5th capacitor C5 and the 6th capacitor R6.First
The first end of inductance L1 respectively with the first end of the 16th resistance R16, the cathode of the 4th diode D4, the 6th capacitor R6 first
End connection；The second end of first inductance L1 is connect with the second end of the 16th resistance R16, the first end of the 5th capacitor R5 respectively；
The second end of 5th capacitor R5 and the second end of the 6th capacitor R6 are grounded respectively.Pulsation for exporting above-mentioned rectification circuit is straight
Galvanic electricity is converted to smooth direct current.
The first end of varistor MOV2 is connect with the first end of the first inductance L1, the first termination of varistor MOV2
Ground.The effect of varistor MOV2 is identical as the effect of varistor MOV1, for preventing because of static discharge, surge and other winks
State electric current causes the damage to circuit.
Circuit for power conversion includes: the first field-effect tube Q1, first resistor R1, second resistance R2,3rd resistor R3, first
Diode D1 and first capacitor C1；Wherein, the first field-effect tube Q1 drain electrode respectively with the first end and output of first capacitor C1
The connection of circuit；The source electrode of first field-effect tube Q1 respectively with the second end of first capacitor C1, the second end of 3rd resistor R3 and
Current feedback circuit connection；The grid of first field-effect tube Q1 respectively with the first end of first resistor R1, second resistance R2
The first end connection of one end, 3rd resistor R3, the second end of second resistance R2 are connect with the anode of first diode D1；One or two
The cathode of pole pipe D1 is connect with the gate driving pin of the second end of first resistor R1 and drive control chip respectively, i.e. driving control
6th pin of coremaking piece.
Wherein, mainly by 6 pins, the 1st pin is connect drive control chip with voltage regulator circuit, for output to be arranged
Voltage value, the 2nd pin are the ground terminal of drive control chip, and the 3rd pin is the power pins of drive control chip, are controlled with driving
The connection of coremaking piece start-up circuit, the 4th pin are the G foot that metal-oxide-semiconductor is driven in drive control chip, are grounded by the 8th capacitor C8,
5th pin current sampling detects pin, connect with current feedback circuit, and the 6th pin is RC and ground carries out internal compensation, with power
Conversion circuit connection.
Further, drive control chip start-up circuit includes: twelfth resistor R12, thirteenth resistor R13, the 14th
Resistance R14, the 15th resistance R15, third capacitor C3, the 4th capacitor C4 and third diode D3；Wherein, twelfth resistor R12,
Thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15 are connected in series；The first end and input of twelfth resistor R12
Circuit connection, the second end of the 15th resistance R15 respectively with the first end of third capacitor C3, the first end of the 4th capacitor C4,
The cathode of three diode D3 is connected with the power pins of drive control chip, i.e. the 3rd pin of drive control chip；Three or two pole
The anode of pipe D3 is connect with voltage regulator circuit；The second end of third capacitor C3 and the second end of the 4th capacitor C4 are grounded respectively.
The first end of twelfth resistor R12 is grounded by the 7th capacitor C7.
Further, voltage regulator circuit includes: the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6；Wherein, the 4th
The first end of resistance R4 is connect with voltage regulator circuit, and the second end of the 4th resistance R4 is connect with the first end of the 5th resistance R5；
The second end of 5th resistance R5 is connect with the voltage adjustment pin of the first end of the 6th resistance R6 and drive control chip respectively, i.e.,
1st pin of drive control chip；The second end of 6th resistance R6 is grounded.
Further, power conditioning circuitry includes: the primary side winding of transformer T；Voltage regulator circuit includes: transformer T
Secondary side winding；Wherein, the Same Name of Ends of the primary side winding of transformer T is connect with input circuit and output circuit respectively；Transformer T
The different name end of primary side winding connect with the drain electrode of the first field-effect tube Q1 in power conditioning circuitry；The secondary side winding of transformer T
Same Name of Ends and voltage regulator circuit in the 4th resistance R4 first end connection；The different name end of the secondary side winding of transformer T is grounded.
Wherein, transformer uses specific transformer, wherein the effective sectional area AE of magnetic core of transformer is 50.1mm2, have
Effect length of magnetic path Le is 22.9mm2, effective volume Ve is 1148.5mm3, weight W is 6.1g/PRS, and such transformer can be
Effective sectional area AE is 50mm2In the case where accomplish high power.
Further, magnetic core of transformer includes left magnetic core, right magnetic core and coil rack, and left magnetic core and right magnetic core use structure
Identical E font structure, left magnetic core and the splicing of right magnetic core become day font structure.Fig. 4 a is in the utility model embodiment two
The right magnetic core of transformer cuts view；Fig. 4 b is the main view of the transformer coil frame in the utility model embodiment two.Such as figure
Shown in 4a, the right magnetic core height B of transformer is 4.7mm ± 0.2mm, and the right magnetic core total height F of transformer is 3.0mm ± 0.2mm.
As shown in Figure 4 b, the length D of the newel of magnetic core of transformer is 20.5mm ± 0.3mm, the width of the newel of the right magnetic core of transformer
Degree G is 2.4mm ± 0.1mm, and the distance between two side walls of the right magnetic core of transformer E is 7.0mm ± 0.2mm, the right magnetic of transformer
The height C of core is 9.5mm ± 0.2mm, and the total length A of magnetic core of transformer is 22.3mm ± 0.3mm.
Further, increase a magnetic bead in transformer T, in circuit equivalent is equivalent to the second inductance L2, is used for
Filter out electromagnetic interference.
In the present embodiment, it in a limited space, uses above-mentioned transformer and is converted as power, its AE value is equal to
50mm2Effective area can accomplish high power, and high efficiency, high photosynthetic efficiency, design of transformer can also be with output high-power at small size.
Further, current feedback circuit includes: the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9；Wherein, the 8th
The first end of resistance R8 is connect with the first end of the 9th resistance R9, the first end of the 7th resistance R7 and power shifting circuit respectively；The
The second end of seven resistance R7 is connect with the current detecting pin of drive control chip, i.e. the 5th pin of drive control chip；8th
The second end of resistance R8 and the second end of the 9th resistance R9 are grounded respectively.
Further, output circuit includes: the tenth resistance R10, eleventh resistor R11, the second diode D2, the first electrolysis
Capacitor CE1, the second capacitor C2 and the first common mode inductance LF1；Wherein, the first end of the second capacitor C2 respectively with the tenth resistance R10
First end, the first end of eleventh resistor R11 connection, the second end of the second capacitor C2 is respectively with the first electrolytic capacitor CE1's
Anode is connected with the cathode of the second diode D2；The second end of tenth resistance R10 respectively with the second end of eleventh resistor R11,
The anode connection of second diode D2；The first end of first common mode inductance LF1 is connect with the cathode of the first electrolytic capacitor CE1, the
Two ends are connect with the anode of the first electrolytic capacitor CE1, and the cathode connection of third end and LED load, the 4th end and LED load are just
Pole connection.
Output circuit include: further include the 17th resistance R17 and the 18th resistance R18；Wherein, the 17th resistance R17 and
18th resistance R18 series connection, the first end of the 17th resistance R17 are connect with the cathode of the first electrolytic capacitor CE1, the 18th resistance
The first end of R18 is connect with the positive pole of the first electrolytic capacitor CE1.
Component in the utility model embodiment uses miniaturized device.Using the scheme of BUCK-BOOST, mainly
It is mesh output voltage design very up to 200-300V, output current design is 100-150MA.It is so that temperature is effectively reduced
It rises, high-efficient, coil current is small, and transformer temperature is low, and whole lamp power can accomplish 35W or less.
LED drive circuit provided by the embodiment of the utility model, by using miniature transformer as circuit for power conversion
In main devices, and the corresponding transformer of voltage regulator circuit transformer corresponding with circuit for power conversion is identical；Transformer
AE value be equal to 50mm2Effective area can accomplish high power, high efficiency, high photosynthetic efficiency, and design of transformer can also be at small size
Output high-power.LED drive circuit provided by the embodiment of the utility model may be implemented to reduce LED while output high-power
The volume of driving circuit.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of Light-emitting diode LED driving circuit characterized by comprising voltage regulator circuit, circuit for power conversion and drive
Dynamic control chip；Wherein, the corresponding transformer of the voltage regulator circuit and the corresponding transformer phase of the circuit for power conversion
Together；
The drive control chip, for the circuit for power conversion transmitting power control signal, Xiang Suoshu voltage to adjust electricity
Road sends regulated voltage signal；
The circuit for power conversion meets predetermined power for being converted to DC power signal according to the power control signal
Out-put supply signal；
The voltage regulator circuit, the direct current for keeping output voltage constant according to the regulated voltage signal.
2. LED drive circuit according to claim 1, which is characterized in that the LED drive circuit further include: input electricity
Road, current feedback circuit and output circuit；Wherein,
The input circuit is believed for mains supply signal to be converted to the corresponding DC power supply of the circuit for power conversion
Number；
The current feedback circuit, for acquiring the output electric current of the output circuit and feeding back to the drive control chip；
The output circuit is connect for the load with LED light, the out-put supply signal that the circuit for power conversion is exported into
Row filtering processing, drives the load of LED light.
3. LED drive circuit according to claim 2, which is characterized in that the input circuit includes: rectification circuit and π
Type filter circuit；Wherein,
The input terminal of the rectification circuit and the output end of EMC filter circuit connect, for converting alternating current to pulsating direct current
Electricity；
The input terminal of the π type filter circuit is connect with the output end of the rectification circuit, for turning the Rectified alternating current
It is changed to smooth direct current.
4. LED drive circuit according to claim 2, which is characterized in that circuit for power conversion includes: the first field-effect
Pipe, first resistor, second resistance, 3rd resistor, first diode and first capacitor；Wherein,
The drain electrode connection with the first end of the first capacitor and the output circuit respectively of first field-effect tube；It is described
The source electrode of first field-effect tube is anti-with the second end of the first capacitor, the second end of the 3rd resistor and the electric current respectively
Current feed circuit connection；The grid of first field-effect tube respectively with the first end of the first resistor, the first end of second resistance,
The first end connection of 3rd resistor, the second end of the second resistance are connect with the anode of the first diode；Described first
The cathode of diode is connect with the gate driving pin of the second end of the first resistor and the drive control chip respectively.
5. LED drive circuit according to claim 1, which is characterized in that the voltage regulator circuit includes: the 4th electricity
Resistance, the 5th resistance and the 6th resistance；Wherein,
The first end of 4th resistance is connect with the voltage regulator circuit, the second end and the described 5th of the 4th resistance
The first end of resistance connects；
The second end of 5th resistance voltage tune with the first end of the 6th resistance and the drive control chip respectively
Save pin connection；The second end of 6th resistance is grounded.
6. LED drive circuit according to claim 2, which is characterized in that the power conditioning circuitry includes: transformer
Primary side winding；The voltage regulator circuit includes: the secondary side winding of transformer；Wherein,
The Same Name of Ends of the primary side winding of the transformer is connect with the input circuit and the output circuit respectively；The transformation
The different name end of the primary side winding of device is connect with the drain electrode of the first field-effect tube in the power conditioning circuitry；
The Same Name of Ends of the secondary side winding of the transformer is connect with the first end of the 4th resistance in the voltage regulator circuit；It is described
The different name end of the secondary side winding of transformer is grounded.
7. LED drive circuit according to claim 2, which is characterized in that the current feedback circuit includes: the 7th electricity
Resistance, the 8th resistance and the 9th resistance；Wherein,
The first end of 8th resistance respectively with the first end of the 9th resistance, the first end of the 7th resistance and described
The connection of power shifting circuit；
The second end of 7th resistance is connect with the current detecting pin of the drive control chip；The of 8th resistance
Two ends and the second end of the 9th resistance are grounded respectively.
8. LED drive circuit according to claim 2, which is characterized in that the output circuit includes: the tenth resistance,
11 resistance, the second diode, the first electrolytic capacitor, the second capacitor and the first common mode inductance；Wherein,
The first end of second capacitor is connect with first end, the first end of eleventh resistor of the tenth resistance respectively, institute
The second end for stating the second capacitor is connect with the cathode of the anode of first electrolytic capacitor and second diode respectively；
The second end of tenth resistance is connect with the anode of the second end of the eleventh resistor, the second diode respectively；
The first end of first common mode inductance is connect with the cathode of first electrolytic capacitor, second end and first electrolysis
The anode connection of capacitor, third end are connect with the cathode of the LED load, and the 4th end is connect with the anode of the LED load.
9. LED drive circuit according to claim 1, which is characterized in that the LED drive circuit further include: driving control
Coremaking piece start-up circuit；Wherein,
The drive control chip start-up circuit controls the driving for providing supply voltage for the drive control chip
Coremaking piece works normally.
10. LED drive circuit according to claim 9, which is characterized in that the drive control chip start-up circuit packet
It includes: twelfth resistor, thirteenth resistor, the 14th resistance, the 15th resistance, third capacitor, the 4th capacitor and third diode；
Wherein,
The twelfth resistor, the thirteenth resistor, the 14th resistance, the 15th resistance are connected in series；It is described
The first end of twelfth resistor is connect with input circuit, the second end of the 15th resistance respectively with the third capacitor
One end, the first end of the 4th capacitor, third diode cathode connected with the power pins of the drive control chip；Institute
The anode for stating third diode is connect with the voltage regulator circuit；The second end of the third capacitor and the 4th capacitor
Second end is grounded respectively.
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|---|---|---|---|
| CN201820526544.5U CN208623943U (en) | 2018-04-13 | 2018-04-13 | A kind of LED drive circuit |
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| CN201820526544.5U CN208623943U (en) | 2018-04-13 | 2018-04-13 | A kind of LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108366461A (en) * | 2018-04-13 | 2018-08-03 | 深圳市豪恩智能物联股份有限公司 | A kind of LED drive circuit |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108366461A (en) * | 2018-04-13 | 2018-08-03 | 深圳市豪恩智能物联股份有限公司 | A kind of LED drive circuit |
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