CN208445801U - The constant-current source power module of adaptive matrix formula LED headlamp - Google Patents
The constant-current source power module of adaptive matrix formula LED headlamp Download PDFInfo
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- CN208445801U CN208445801U CN201821182575.XU CN201821182575U CN208445801U CN 208445801 U CN208445801 U CN 208445801U CN 201821182575 U CN201821182575 U CN 201821182575U CN 208445801 U CN208445801 U CN 208445801U
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- 239000011159 matrix material Substances 0.000 title claims abstract description 17
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 82
- 238000009825 accumulation Methods 0.000 claims description 20
- 230000005669 field effect Effects 0.000 claims description 16
- 230000006837 decompression Effects 0.000 claims description 13
- 239000003381 stabilizer Substances 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 8
- 239000011324 bead Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000422 nocturnal effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of constant-current source power modules of adaptive matrix formula LED headlamp, including booster circuit and several reduction voltage circuits being arranged in parallel, the reduction voltage circuit series connection of boost voltage and several parallel connections is depressured again after vehicle-mounted voltage is first boosted and powers to LED headlamp.The utility model carries out driving LED with the mode for being depressured constant current afterwards of first boosting.First by vehicle-mounted voltage, 40.5 ± 0.5V is risen to by booster circuit.Then, voltage and current required for constant current to LED is depressured from 40.5 ± 0.5V.Entire buck process improves switch power efficiency to greatest extent, to reduce module heating, reduces cost, improves the reliability of product.
Description
Technical field
The utility model belongs to automobile power supply technique field, and in particular to a kind of perseverance of adaptive matrix formula LED headlamp
Flow source current module.
Background technique
It is according to statistics nocturnal, so visual problem is in traffic accident close to half in vehicle major accident
Important function.For improve to greatest extent driver nighttime driving comfort level, be born automated matrix formula LED headlamp.By
In LED characteristic, a constant-current source power module is needed to be driven.Constant-current source power module output current is bigger, installation position
Set that regional temperature is relatively high, so the efficiency of the Switching Power Supply of this module is particularly important.And the low efficiency of current Switching Power Supply,
Calorific value is big, can not carry out 100W power output in so high working temperature environment.
Utility model content
To solve to work in automobile high-temperature region at present, while the technology for needing to export the LED drive module of 100W power is asked
Topic, the utility model proposes a kind of constant-current source power modules of adaptive matrix formula LED headlamp.
In order to solve the above technical problems, technical solution used by the utility model is as follows:
A kind of constant-current source power module of adaptive matrix formula LED headlamp, including booster circuit and several be arranged in parallel
Reduction voltage circuit, the reduction voltage circuit series connection of boost voltage and several parallel connections is depressured again after vehicle-mounted voltage is first boosted to LED
Headlight power supply.
The booster circuit includes boosting rectifier control unit, boosting output unit and voltage feedback unit, boosting rectifier control unit
Control chip U2 be connected with a vehicle-mounted power supply, boosting output unit by N-channel field-effect tube Q4 with control chip U2 connect；It rises
Press feeder ear of the output end as reduction voltage circuit of output unit, voltage feedback unit is by the voltage of boosting output unit output end
It feeds back in control chip U2.Control the model TPS40211 of chip U2.
The boosting rectifier control unit, including control chip U2, resistance R1, resistance R5, resistance R23, capacitor C20, capacitor
C28, capacitor C25, capacitor C29, the first filter unit；One end of resistance R1 is connected with a vehicle-mounted power supply, the other end point of resistance R1
It for two-way, is grounded after being connected in series all the way with resistance R5, another way is directly connect with the 3rd pin of control chip U2；Resistance R23
The first filter unit of one end be connected with a vehicle-mounted power supply, the other end of resistance R23 is divided into two-way, all the way directly with control chip
The 1st pin of U2 connects, and another way is grounded after capacitor C20；One end of capacitor C28 is connect with the ground terminal of capacitor C20, capacitor
The other end of C28 is connect with the 2nd pin of control chip U2；Control chip U2 the 10th pin all the way through the first filter unit with
Vehicle power supply connection, another way are grounded through capacitor C25；Control the 9th pipe foot meridian capacitor C29 ground connection of chip U2.
First filter unit includes four ground capacities being connected in parallel.
The boosting output unit, including output end, the second filter unit, accumulation of energy inductance L2, voltage-stabiliser tube D1, boosting filtering
Capacitance group, N-channel field-effect tube Q4, resistance R27, resistance R28, resistance R31, resistance R30, capacitor C31；Second filter unit packet
Include six ground capacities being connected in parallel.Boosting filter capacitor group be also include 6 ground capacities being connected in parallel.
The second filter unit of one end and the first filter unit of accumulation of energy inductance L2 is connected with a vehicle-mounted power supply, accumulation of energy inductance L2
The other end be divided into two-way, connect all the way with the drain D of N-channel field-effect tube Q4, another way through voltage-stabiliser tube D1 and boosting filter
Capacitance group is connect with output end, feeder ear of the output end as reduction voltage circuit；The source S and substrate of N-channel field-effect tube Q4 connects
It connects between the resistance R31 and resistance R30 of series connection, resistance R30 ground connection；The 7th pin of resistance R31 and control chip U2 connect
It connects, one end of capacitor C31 is connected between resistance R31 and the 7th pin for controlling chip U2, and the other end of capacitor C31 is grounded；N
Resistance R27 and resistance R28 of the grid G of channel field-effect pipe Q4 through being connected in parallel are connect with the 8th pin of control chip U2.
The voltage feedback unit, including resistance R34, resistance R33, capacitor C56, resistance R35, capacitor C30, capacitor C35；
One end of resistance R34 is connect with output end, and the other end of resistance R34 is divided into two-way, all the way with the resistance R33 and electricity that are arranged in parallel
Hold after C56 is connected in series and is grounded；Another way is further divided into two-way, directly connect all the way with the 5th pin of control chip U2, another way
It is connect through capacitor C35 with the 4th pin of control chip U2, and in parallel with capacitor C35 after resistance R35 and capacitor C30 series connection
Connection.
The reduction voltage circuit, including decompression control unit, reduced output voltage unit and current feedback unit, are depressured control unit
Control chip U4 with boosting output unit output end connect, reduced output voltage unit through accumulation of energy inductance L4 and control chip U4 company
It connects and the feeder ear of reduced output voltage unit is headlamp LED power supply, current feedback unit is by the electricity of reduced output voltage unit feeder ear
Stream is fed back in control chip U4.Control the model TPS92515 of chip U4.
The decompression control unit, including control chip U4, resistance R39, resistance R40, resistance R43, ground capacity C51,
Ground capacity C52；The output end of the 8th pin and booster circuit that control chip U4 connects, and in the 8th pin of control chip U4
The ground capacity C51 and ground capacity C52 being connected in parallel are provided between the output end of booster circuit；Control the of chip U4
6 pins and the 7th pin are connect through resistance R43 with the 8th pin of control chip U4 jointly；The 9th pin for controlling chip U4 is hanging,
The 10th pin of control chip U4 is grounded through resistance R40 all the way, and another way is connect through resistance R39 with 5V power supply.
The reduced output voltage unit, including feeder ear, ground capacity C49, capacitor C63, diode D5, voltage-stabiliser tube D6, storage
It can inductance L4, decompression filter capacitor group；The 5th pin of control chip U4 is connect with accumulation of energy inductance L4, and accumulation of energy inductance L4 is through being depressured
It is connect after filter capacitor group with feeder ear, feeder ear is powered to the LED lamp bead of headlight；And in the ground connection of decompression filter capacitor group
Voltage-stabiliser tube D6 is provided between end and the 5th pin of control chip U4；After the 5th pipe foot meridian capacitor C63 of control chip U4 all the way
It is connect with the 4th pin of control chip U4, another way is connect with the cathode of diode D5, anode and the control chip of diode D5
The 2nd pin of U4 connects, and the grounded capacitor C49 of the 2nd pin for controlling chip U4 is connect with the 3rd pin of control chip U4.
The current feedback unit, including resistance R42, ground capacity C48；One end of resistance R42 is connect with feeder ear, electricity
The other end for hindering R42 connect with the 1st pin of control chip U4, and sets between resistance R42 and the 1st pin of control chip U4
It is equipped with ground capacity C48.
The utility model carries out driving LED with the mode for being depressured constant current afterwards of first boosting.First by vehicle-mounted voltage, pass through boosting electricity
Road rises to 40.5 ± 0.5V.Then, voltage and current required for constant current to LED is depressured from 40.5 ± 0.5V.Entire buck
Process improves switch power efficiency to greatest extent, to reduce module heating, reduces cost, improves the reliable of product
Property.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are under that premise of not paying creative labor
Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure 1, a kind of constant-current source power module of adaptive matrix formula LED headlamp, if including booster circuit and
The dry reduction voltage circuit being arranged in parallel, boost voltage and several parallel connections reduction voltage circuit series connection vehicle-mounted voltage is first boosted after again
It is depressured and powers to LED headlamp.
The booster circuit includes boosting rectifier control unit, boosting output unit and voltage feedback unit, boosting rectifier control unit
Control chip U2 be connected with a vehicle-mounted power supply, boosting output unit by N-channel field-effect tube Q4 with control chip U2 connect；It rises
Press feeder ear of the output end as reduction voltage circuit of output unit, voltage feedback unit is by the voltage of boosting output unit output end
It feeds back in control chip U2.Control the model TPS92515 of chip U2.
The boosting rectifier control unit, including control chip U2, resistance R1, resistance R5, resistance R23, capacitor C20, capacitor
C28, capacitor C25, capacitor C29, the first filter unit；One end of resistance R1 is connected with a vehicle-mounted power supply, the other end point of resistance R1
It for two-way, is grounded after being connected in series all the way with resistance R5, another way is directly connect with the 3rd pin of control chip U2；Resistance R23
The first filter unit of one end be connected with a vehicle-mounted power supply, the other end of resistance R23 is divided into two-way, all the way directly with control chip
The 1st pin of U2 connects, and another way is grounded after capacitor C20；One end of capacitor C28 is connect with the ground terminal of capacitor C20, capacitor
The other end of C28 is connect with the 2nd pin of control chip U2；Control chip U2 the 10th pin all the way through the first filter unit with
Vehicle power supply connection, another way are grounded through capacitor C25；Control the 9th pipe foot meridian capacitor C29 ground connection of chip U2.First filter
Wave unit includes four ground capacities being connected in parallel.
The boosting output unit, including output end, the second filter unit, accumulation of energy inductance L2, voltage-stabiliser tube D1, boosting filtering
Capacitance group, N-channel field-effect tube Q4, resistance R27, resistance R28, resistance R31, resistance R30, capacitor C31；Second filter unit packet
Include six ground capacities being connected in parallel.Boosting filter capacitor group be also include 6 ground capacities being connected in parallel.
The second filter unit of one end and the first filter unit of accumulation of energy inductance L2 is connected with a vehicle-mounted power supply, accumulation of energy inductance L2
The other end be divided into two-way, connect all the way with the drain D of N-channel field-effect tube Q4, another way through voltage-stabiliser tube D1 and boosting filter
Capacitance group is connect with output end, feeder ear of the output end as reduction voltage circuit；The source S and substrate of N-channel field-effect tube Q4 connects
It connects between the resistance R31 and resistance R30 of series connection, resistance R30 ground connection；The 7th pin of resistance R31 and control chip U2 connect
It connects, one end of capacitor C31 is connected between resistance R31 and the 7th pin for controlling chip U2, and the other end of capacitor C31 is grounded；N
Resistance R27 and resistance R28 of the grid G of channel field-effect pipe Q4 through being connected in parallel are connect with the 8th pin of control chip U2.
The voltage feedback unit, including resistance R34, resistance R33, capacitor C56, resistance R35, capacitor C30, capacitor C35；
One end of resistance R34 is connect with output end, and the other end of resistance R34 is divided into two-way, all the way with the resistance R33 and electricity that are arranged in parallel
Hold after C56 is connected in series and is grounded；Another way is further divided into two-way, directly connect all the way with the 5th pin of control chip U2, another way
It is connect through capacitor C35 with the 4th pin of control chip U2, and in parallel with capacitor C35 after resistance R35 and capacitor C30 series connection
Connection.
The reduction voltage circuit, including decompression control unit, reduced output voltage unit and current feedback unit, are depressured control unit
Control chip U4 with boosting output unit output end connect, reduced output voltage unit through accumulation of energy inductance L4 and control chip U4 company
It connects and the feeder ear of reduced output voltage unit is headlamp LED power supply, current feedback unit is by the electricity of reduced output voltage unit feeder ear
Stream is fed back in control chip U4.Control the model TPS92515 of chip U4.
The decompression control unit, including control chip U4, resistance R39, resistance R40, resistance R43, ground capacity C51,
Ground capacity C52；The output end of the 8th pin and booster circuit that control chip U4 connects, and in the 8th pin of control chip U4
The ground capacity C51 and ground capacity C52 being connected in parallel are provided between the output end of booster circuit；Control the of chip U4
6 pins and the 7th pin are connect through resistance R43 with the 8th pin of control chip U4 jointly；The 9th pin for controlling chip U4 is hanging,
The 10th pin of control chip U4 is grounded through resistance R40 all the way, and another way is connect through resistance R39 with 5V power supply.
The reduced output voltage unit, including feeder ear, ground capacity C49, capacitor C63, diode D5, voltage-stabiliser tube D6, storage
It can inductance L4, decompression filter capacitor group；The 5th pin of control chip U4 is connect with accumulation of energy inductance L4, and accumulation of energy inductance L4 is through being depressured
It is connect after filter capacitor group with feeder ear, feeder ear is powered to the LED lamp bead of headlight；And in the ground connection of decompression filter capacitor group
Voltage-stabiliser tube D6 is provided between end and the 5th pin of control chip U4；After the 5th pipe foot meridian capacitor C63 of control chip U4 all the way
It is connect with the 4th pin of control chip U4, another way is connect with the cathode of diode D5, anode and the control chip of diode D5
The 2nd pin of U4 connects, and the grounded capacitor C49 of the 2nd pin for controlling chip U4 is connect with the 3rd pin of control chip U4.
The current feedback unit, including resistance R42, ground capacity C48；One end of resistance R42 is connect with feeder ear, electricity
The other end for hindering R42 connect with the 1st pin of control chip U4, and sets between resistance R42 and the 1st pin of control chip U4
It is equipped with ground capacity C48.
The module that constant-current source power module is made of booster circuit and decompression constant-current circuit.Booster circuit is by control chip
U2 generates PWM control；N-channel field-effect tube is as driving；It is boosted and is filtered by accumulation of energy inductance L2, filter capacitor group again；
Voltage Feedback is carried out simultaneously carrys out burning voltage output.The voltage risen to is particularly relevant to the efficiency of Switching Power Supply, most through overtesting
Voltage is risen to 40.5 ± 0.5V by us eventually.Reduction voltage circuit-generates PWM control and built-in driving by control chip U4, then by storing
Energy inductance L4, decompression filter capacitor are depressured and are filtered, while being carried out current feedback and being carried out constant current output.
Described above is only the preferred embodiment of the utility model, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (9)
1. a kind of constant-current source power module of adaptive matrix formula LED headlamp, it is characterised in that: including booster circuit and several
The reduction voltage circuit series connection of the reduction voltage circuit being arranged in parallel, boost voltage and several parallel connections is dropped again after vehicle-mounted voltage is first boosted
It presses and powers to LED headlamp.
2. the constant-current source power module of adaptive matrix formula LED headlamp according to claim 1, it is characterised in that: institute
Stating booster circuit includes boosting rectifier control unit, boosting output unit and voltage feedback unit, the control chip of boosting rectifier control unit
U2 is connected with a vehicle-mounted power supply, and boosting output unit is connect by N-channel field-effect tube Q4 with control chip U2；Boost output unit
Feeder ear of the output end as reduction voltage circuit, voltage feedback unit is by the Voltage Feedback for the output unit output end that boosts to controlling
In chip U2.
3. the constant-current source power module of adaptive matrix formula LED headlamp according to claim 2, it is characterised in that: institute
State boosting rectifier control unit, including control chip U2, resistance R1, resistance R5, resistance R23, capacitor C20, capacitor C28, capacitor C25,
Capacitor C29, the first filter unit；One end of resistance R1 is connected with a vehicle-mounted power supply, and the other end of resistance R1 is divided into two-way, all the way with
Resistance R5 is grounded after being connected in series, and another way is directly connect with the 3rd pin of control chip U2；One end first of resistance R23
Filter unit is connected with a vehicle-mounted power supply, and the other end of resistance R23 is divided into two-way, all the way the 1st pin directly with control chip U2
Connection, another way are grounded after capacitor C20；One end of capacitor C28 is connect with the ground terminal of capacitor C20, the other end of capacitor C28
It is connect with the 2nd pin of control chip U2；The 10th pin for controlling chip U2 connects through the first filter unit and vehicle power supply all the way
It connects, another way is grounded through capacitor C25；Control the 9th pipe foot meridian capacitor C29 ground connection of chip U2.
4. the constant-current source power module of adaptive matrix formula LED headlamp according to claim 2, it is characterised in that: institute
State boosting output unit, including output end, the second filter unit, accumulation of energy inductance L2, voltage-stabiliser tube D1, boosting filter capacitor group, N ditch
Road field-effect tube Q4, resistance R27, resistance R28, resistance R31, resistance R30, capacitor C31；
The second filter unit of one end and the first filter unit of accumulation of energy inductance L2 is connected with a vehicle-mounted power supply, and accumulation of energy inductance L2's is another
One end is divided into two-way, connect all the way with the drain D of N-channel field-effect tube Q4, and another way is through voltage-stabiliser tube D1 and boosting filter capacitor
Group is connect with output end, feeder ear of the output end as reduction voltage circuit；The source S and substrate of N-channel field-effect tube Q4 is connected to
Between the resistance R31 and resistance R30 of series connection, resistance R30 ground connection；Resistance R31 is connect with the 7th pin of control chip U2,
One end of capacitor C31 is connected between resistance R31 and the 7th pin for controlling chip U2, and the other end of capacitor C31 is grounded；N-channel
Resistance R27 and resistance R28 of the grid G of field-effect tube Q4 through being connected in parallel are connect with the 8th pin of control chip U2.
5. the constant-current source power module of adaptive matrix formula LED headlamp according to claim 2, it is characterised in that: institute
State voltage feedback unit, including resistance R34, resistance R33, capacitor C56, resistance R35, capacitor C30, capacitor C35；Resistance R34
One end is connect with output end, and the other end of resistance R34 is divided into two-way, is connected all the way with the resistance R33 and capacitor C56 being arranged in parallel
It is grounded after connection；Another way is further divided into two-way, directly connect all the way with the 5th pin of control chip U2, another way is through capacitor C35
It connect with the 4th pin of control chip U2, and is connected in parallel after resistance R35 and capacitor C30 series connection with capacitor C35.
6. the constant-current source power module of adaptive matrix formula LED headlamp according to claim 1 or 2, it is characterised in that:
The reduction voltage circuit, including decompression control unit, reduced output voltage unit and current feedback unit, are depressured the control core of control unit
Piece U4 is connect with the output end of boosting output unit, and reduced output voltage unit connect and is depressured with control chip U4 through accumulation of energy inductance L4
The feeder ear of output unit be headlamp LED power supply, current feedback unit by the current feedback of reduced output voltage unit feeder ear extremely
It controls in chip U4.
7. the constant-current source power module of adaptive matrix formula LED headlamp according to claim 6, it is characterised in that: institute
State decompression control unit, including control chip U4, resistance R39, resistance R40, resistance R43, ground capacity C51, ground capacity
C52；The output end of the 8th pin and booster circuit that control chip U4 connects, and in the 8th pin of control chip U4 and boosting electricity
The ground capacity C51 and ground capacity C52 being connected in parallel are provided between the output end on road；Control chip U4 the 6th pin and
7th pin is connect through resistance R43 with the 8th pin of control chip U4 jointly；The 9th pin for controlling chip U4 is hanging, controls core
The 10th pin of piece U4 is grounded through resistance R40 all the way, and another way is connect through resistance R39 with 5V power supply.
8. the constant-current source power module of adaptive matrix formula LED headlamp according to claim 6, it is characterised in that: institute
State reduced output voltage unit, including feeder ear, ground capacity C49, capacitor C63, diode D5, voltage-stabiliser tube D6, accumulation of energy inductance L4, drop
Filters pressing wave capacitance group；The 5th pin of control chip U4 is connect with accumulation of energy inductance L4, and accumulation of energy inductance L4 is after being depressured filter capacitor group
It is connect with feeder ear, feeder ear is powered to the LED lamp bead of headlight；And in the ground terminal of decompression filter capacitor group and control chip
Voltage-stabiliser tube D6 is provided between the 5th pin of U4；Control chip U4 the 5th pipe foot meridian capacitor C63 after all the way with control chip U4
The connection of the 4th pin, another way connect with the cathode of diode D5, the anode of diode D5 and the 2nd pin for controlling chip U4
Connection, the grounded capacitor C49 of the 2nd pin for controlling chip U4 are connect with the 3rd pin of control chip U4.
9. the constant-current source power module of adaptive matrix formula LED headlamp according to claim 6, it is characterised in that: institute
State current feedback unit, including resistance R42, ground capacity C48；One end of resistance R42 is connect with feeder ear, and resistance R42's is another
One end is connect with the 1st pin of control chip U4, and is provided with ground connection between resistance R42 and the 1st pin of control chip U4
Capacitor C48.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821182575.XU CN208445801U (en) | 2018-07-25 | 2018-07-25 | The constant-current source power module of adaptive matrix formula LED headlamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821182575.XU CN208445801U (en) | 2018-07-25 | 2018-07-25 | The constant-current source power module of adaptive matrix formula LED headlamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208445801U true CN208445801U (en) | 2019-01-29 |
Family
ID=65085759
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821182575.XU Withdrawn - After Issue CN208445801U (en) | 2018-07-25 | 2018-07-25 | The constant-current source power module of adaptive matrix formula LED headlamp |
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| CN (1) | CN208445801U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108684111A (en) * | 2018-07-25 | 2018-10-19 | 河南天海电器有限公司 | A kind of constant-current source power module of adaptive matrix formula LED headlamp |
-
2018
- 2018-07-25 CN CN201821182575.XU patent/CN208445801U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108684111A (en) * | 2018-07-25 | 2018-10-19 | 河南天海电器有限公司 | A kind of constant-current source power module of adaptive matrix formula LED headlamp |
| CN108684111B (en) * | 2018-07-25 | 2024-05-07 | 河南天海电器有限公司 | Constant current source power supply module of self-adaptive matrix type LED headlight |
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