CN104582183B - A kind of constant current driver circuit for LED and device using step-down constant current driving unit - Google Patents
A kind of constant current driver circuit for LED and device using step-down constant current driving unit Download PDFInfo
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- CN104582183B CN104582183B CN201510009852.1A CN201510009852A CN104582183B CN 104582183 B CN104582183 B CN 104582183B CN 201510009852 A CN201510009852 A CN 201510009852A CN 104582183 B CN104582183 B CN 104582183B
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Abstract
The present invention relates to a kind of constant current driver circuit for LED using step-down constant current driving unit and the LED automobile illumination device comprising the circuit, the dc source of constant current driver circuit for LED provides two kinds of power supplys of distance light end power supply and dipped beam end power supply, reverse polarity protection's unit carries out reverse polarity protection to constant current driver circuit for LED, the distance light end power supply or dipped beam end power supply that have passed through reverse polarity protection's unit are carried out step-down constant current by step-down constant current driving unit, and the distance light end power supply or dipped beam end power supply that are depressured after constant current are supplied to LED illumination unit, to drive LED illumination unit, far and near light unit receives the distance light end power supply or dipped beam end power supply that dc source is provided, and control LED illumination unit to carry out the switching between distance light end and dipped beam end.The constant current driver circuit for LED of the present invention and the LED automobile illumination device comprising the circuit, it is possible to achieve the distance-light regulation of LED illumination module, with simple in construction, the characteristics of performance is stable.
Description
Technical field
Constant-current drive circuit is depressured the present invention relates to LED automobile lamp lighting field, more particularly to a kind of LED and including this
The LED automobile illumination device of circuit.Present invention additionally comprises a kind of LED automobile lamp using the circuit.
Background technology
With the continuous development of scientific technology, LED is as novel green light source, and it has energy-saving and environmental protection, efficient spy
Point, technology is ripe and applied to every field, and LED is wide as automotive lighting new light sources
It is general to use, consequently also occur in that various LED drive circuits.LED automobile lamp is using many great power LED strings
Connected mode in parallel again after connection, this requires that LED drive circuit has input voltage wide, the characteristics of driving current is big.
Current LED lamp drive circuit uses constant-current driven chip with the type of drive of external metal-oxide-semiconductor to ensure LED automobile lamp
Required electric current is big, the stable characteristic of constant current.Another constant-current driven chip input voltage range is narrow, and drop need to be set in the driving circuit
Press mu balanced circuit.Using two constant-current drive circuits more than distance-light switching circuit, pass through the one of control circuit realiration of control
Distance-light switches, and this circuit has circuit complexity, high cost, the high shortcoming of fragile and power consumption.Also have a small number of using a driving
Circuit realiration distance-light switches, but is also that element is more, and circuit is complicated, separately need to separately connect power supply from automobile accumulator jar, this, which is resulted in, makes
With inconvenience, drive circuit is simultaneously constantly in live line work state, causes power consumption excessive.
The content of the invention
In order to solve above-mentioned technical problem of the prior art, the present invention is new be propose it is a kind of it is simple, in Width funtion
Also can constant current output, high efficiency, the step-down drive circuit of low cost under the conditions of input range.
The purpose of the present invention can be achieved by the following technical measures：A kind of LED using step-down constant current driving unit is permanent
Drive circuit is flowed, the constant current driver circuit for LED with step-down constant current driving unit includes dc source, reverse polarity protection's list
Member, step-down constant current driving unit and far and near light unit, the dc source provide two kinds of electricity of distance light end power supply and dipped beam end power supply
Source, the input of reverse polarity protection's unit is connected to the dc source, and the constant current driver circuit for LED is carried out instead
Polarity protection, the power input of the step-down constant current driving unit is connected to the output end of reverse polarity protection's unit, will
The distance light end power supply or dipped beam end power supply that have passed through reverse polarity protection's unit carry out step-down constant current, and by after step-down constant current
Distance light end power supply or dipped beam end power supply are supplied to LED illumination unit, to drive the LED illumination unit, the far and near light unit
The dc source, reverse polarity protection's unit, the step-down constant current driving unit and the LED illumination unit are connected to,
Distance light end power supply or dipped beam end power supply that the dc source is provided are received, and controls the LED illumination unit to carry out distance light end
Switching between dipped beam end.
The purpose of the present invention can be also achieved by the following technical measures：
Reverse polarity protection's unit includes distance light end Schottky diode and dipped beam end Schottky diode, the distance light
The anode of end Schottky diode is connected to the positive pole of the distance light end power supply of the dc source, the pole of dipped beam end Schottky two
The anode of pipe is connected to the positive pole of the dipped beam end power supply of the dc source, distance light end Schottky diode and the dipped beam
The negative electrode of end Schottky diode connects together, and is connected to the power input of the step-down constant current driving unit.
The step-down constant current driving unit includes step-down current constant control chip, energy storage inductor, the first electrodeless electric capacity and afterflow
Diode, the power input pin of the step-down current constant control chip is connected to the output end of reverse polarity protection's unit, institute
The grounding pin ground connection of step-down current constant control chip is stated, the CS pins of the step-down current constant control chip are connected to the LED and shone
The negative electrode of light emitting diode in bright unit, one end of first electrodeless electric capacity is connected to the electricity of the step-down current constant control chip
Source input pin, the other end is connected to the VC pins of the step-down current constant control chip, and one end of the energy storage inductor is connected to
The SW pins of the step-down current constant control chip, the other end is connected to the anode of light emitting diode in the LED illumination unit, institute
The plus earth of fly-wheel diode is stated, negative electrode is connected to the SW pins of the step-down current constant control chip.
The step-down constant current driving unit also has electrode capacitance including first, and first positive pole for having electrode capacitance is connected to institute
State the other end of energy storage inductor, negative pole ground connection.
The step-down constant current driving unit also has electrode capacitance including the second electrodeless electric capacity and second, and described second has electrode capacitance
Positive pole be connected to the output end of reverse polarity protection's unit, negative pole ground connection, second electrodeless electric capacity is parallel to described the
Two have the positive pole and negative pole of electrode capacitance.
First electrodeless electric capacity and second electrodeless electric capacity are ceramic condenser, and described first has electrode capacitance and described the
Two have electrode capacitance for electrochemical capacitor.
The far and near light unit include metal-oxide-semiconductor, the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th adopts
Sample resistance and divider resistance, one end of the divider resistance are connected to the positive pole of the distance light end power supply of the dc source, another
End is connected to the pin 4 of the metal-oxide-semiconductor, the pin 1,2,3 of the metal-oxide-semiconductor and after connecing, and is connected to described the be connected in parallel
One end of one sampling resistor and second sampling resistor, first sampling resistor being connected in parallel and second sampling
The other end of resistance is connected to the CS pins of the step-down current constant control chip, the pin 5,6,7,8 of the metal-oxide-semiconductor and after connecing,
One end of the 3rd sampling resistor being connected in parallel and the 4th sampling resistor is connected to, described be connected in parallel
The other end of three sampling resistors and the 4th sampling resistor is connected to the CS pins of the step-down current constant control chip.
The far and near light unit also includes bleeder resistance and voltage-regulator diode, and one end of the bleeder resistance is connected to described
The pin 4 of metal-oxide-semiconductor, other end ground connection, the negative electrode of the voltage-regulator diode is connected to the pin 4 of the metal-oxide-semiconductor, plus earth.
The LED illumination unit includes light emitting diode matrix, and the LED array structure is that multiple branch circuit is in parallel
Or single spur track cascade.
The purpose of the present invention can be also achieved by the following technical measures：A kind of LED automobile illumination device, the LED vapour
Car lighting device includes the above-mentioned constant current driver circuit for LED with step-down constant current driving unit.
The constant current driver circuit for LED and LED automobile illumination device with step-down constant current driving unit in the present invention, passes through control
Even if coremaking piece, metal-oxide-semiconductor, lighting module etc. cause when input voltage changes in the case of wide-range input voltage, no
There is larger fluctuating in the electric current that LED can be flowed through, to ensure LED luminosity.In addition, passing through high-pressure side and metal-oxide-semiconductor
Connection, the resistance sizes of input circuit are adjusted by metal-oxide-semiconductor internal circuit, and then the electric current of realization regulation input circuit is big
It is small, finally realize the distance-light regulation of LED illumination module.With simple in construction, the characteristics of performance is stable.
Brief description of the drawings
Fig. 1 is a kind of mould of a specific embodiment of constant current driver circuit for LED with step-down constant current driving unit of the present invention
Block figure；
Fig. 2 is a kind of electricity of a specific embodiment of constant current driver circuit for LED with step-down constant current driving unit of the present invention
Lu Tu.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples pair
The present invention is further elaborated.It should be appreciated that embodiment described herein is only used for explaining the present invention, without limiting
The present invention.
As shown in figure 1, Fig. 1 is the one specific real of the constant current driver circuit for LED with step-down constant current driving unit of the present invention
Apply the module map of example.This includes dc source A, reverse polarity protection's list with the constant current driver circuit for LED of step-down constant current driving unit
First B, step-down constant current driving unit C and far and near light unit E.Dc source A provides two kinds of electricity of distance light end power supply and dipped beam end power supply
Source.Reverse polarity protection's unit B is connected to dc source A, and carries out reverse polarity protection to constant current driver circuit for LED.It is depressured constant current
Driver element C is connected to reverse polarity protection's unit B, and distance light end power supply or the dipped beam end that will have passed through reverse polarity protection's unit B
Power supply carries out step-down constant current, and the distance light end power supply or dipped beam end power supply that are depressured after constant current are supplied into LED illumination unit D, with
Drive LED illumination unit D.Far and near light unit E is connected to dc source A, reverse polarity protection's unit B, step-down constant current driving unit C
With LED illumination unit D, distance light end power supply or dipped beam end power supply that dc source A is provided are received, and control LED illumination unit D to enter
Switching between row distance light end and dipped beam end.In one example, dc source A provides 8~36V dc source.It is depressured constant current
Driver element C power output end as whole LED drive circuits power output end, it may also be said to, step-down constant current driving is single
First C power output end is electrically connected with the power output end of whole LED drive circuits, and the power supply of whole LED drive circuits is defeated
Going out end is used to provide power supply to LED illumination unit D.
As shown in Fig. 2, Fig. 2 is a kind of the one specific of constant current driver circuit for LED with step-down constant current driving unit of the present invention
The circuit diagram of embodiment.Reverse polarity protection's unit B includes distance light end Schottky diode D1 and dipped beam end Schottky diode D2.
Step-down constant current driving unit C include energy storage inductor L1, the first electrodeless electric capacity C1, the second electrodeless electric capacity C2, first have electrode capacitance C3,
Second has electrode capacitance C4, sustained diode 3 and step-down current constant control chip U1.Distance light end Schottky diode D1 anode connects
It is connected to the positive pole VH+ of distance light end power supply.Dipped beam end Schottky diode D2 anode is connected to the positive pole VL+ of dipped beam end power supply.
Distance light end Schottky diode D1 and dipped beam end Schottky diode D2 negative electrode connect together, and are connected to step-down constant current drive
Moving cell C power input, that is, be depressured the current constant control chip U1 pin of working power input pin 5 (VIN) electrical connection.Work as electricity
In the case of the both positive and negative polarity wrong of source, due to the single-phase conduction of Schottky diode, reverse polarity protection is played to circuit.
As shown in Fig. 2, it is depressured in constant current driving unit C, step-down current constant control chip U1 working power input pin 5
Pin (VIN) and the power output end of reverse polarity protection's unit B, i.e. D1, D2 negative electrode electrical connection；It is depressured current constant control chip U1
The pin of grounding leg 1 (GND) and the pin of current detecting pin 2 (CS) between pass through the far and near sampling resistor closed in unit B as shown in Figure 1
Electrical connection；Second has electrode capacitance C4 to be connected in the power output end and the step-down current constant control of the reversed polarity unit B in parallel
Between chip U1 grounding leg, to prevent big transient voltage, noise is eliminated.Second electrodeless electric capacity C2, which is connected in parallel on second, pole
Electric capacity C4 two ends, to carry out high frequency decoupling.First has electrode capacitance C3 to be connected in parallel on LED illumination unit D diode anode and ground
Between, to reduce output ripple voltage.First electrodeless electric capacity C1 is connected in parallel between the pin of U1 chips 5 and 4 pin, is used as chip internal electricity
Press regulator bypass electric capacity.
In one embodiment, the first electrodeless electric capacity C1 and the second electrodeless electric capacity C2 is ceramic condenser.First has electrode capacitance C3
It is electrochemical capacitor to have electrode capacitance C4 with second.
As shown in Fig. 2, the step-down constant current driving unit C also includes sustained diode 3, the sun of the sustained diode 3
Pole is grounded.The negative electrode of sustained diode 3 is electrically connected with being depressured the current constant control chip U1 pin of driving pin 3 (SW).In work(built in U1
When rate metal-oxide-semiconductor disconnects, 3 groups of energy storage inductor L1, the sampling resistor in LED illumination unit D distance-light cells Ds and sustained diode
Into a current loop, the illumination to lighting module D.
Energy storage inductor L1 one end is connected to the negative electrode of sustained diode 3, and the other end is connected to the defeated of LED illumination unit D
Enter end.
The operation principle for being depressured current constant control chip U1 is according to the pressure drop above sampling resistor RCS, adjust automatically constant current
Integrated chip U1 3 pin (SW) export the duty cycle of switching of pulse, in a cycle, and metal-oxide-semiconductor built in U1 disconnects, 3 pin
(SW) high level is exported, current loop is by energy storage inductor L1, LED, sampling resistor RCS, MOS pipe U2 to dc source A's
Negative pole formation current loop, electric current and energy storage inductor L1 storage energy are provided for LED；When constant current integrated chip U1 built-in powers
Metal-oxide-semiconductor is turned on, and U1 3 pin output low level, electric power loop is closed, according to the working characteristics of inductance component, energy storage inductor L1 storages
Electric energy has been deposited, has been LED by energy storage inductor L1, LED, sustained diode 3, sampling resistor RCS, MOS pipe U2 formation loop
Operating current is provided, until metal-oxide-semiconductor built in next cycle U1 is turned on, so as to reach the purpose of constant current.
Therefore, as long as the resistance of the sampling resistor in distance-light cells D is determined, then output constant current is to determine.It is permanent
Flow reference voltage source one comparator of formation inside integrated chip U1 2 pin sampling pin and constant current integrated chip U1, sampling
After comparison of the heel of pin 2 according to the use voltage and reference voltage of sampling resistor, adjust automatically control inside constant current integrated chip U1
The dutycycle of pulse is opened, closed to built-in metal-oxide-semiconductor；If sampled voltage is more than reference voltage, illustrate that output current is more than setting
Value, then the dutycycle of pulse is reduced by, reduces output current to setting value, if sampled voltage is less than reference voltage, explanation
Output current is less than setting value, then the dutycycle of pulse just increases, increase output current to setting value.
Far and near light unit E, it includes metal-oxide-semiconductor U2, the first sampling resistor RS1, the second sampling resistor RS2, the 3rd sampling electricity
Hinder RS3, the 4th sampling resistor RS4, divider resistance R1, bleeder resistance R2 and voltage-regulator diode W1.
The pin 4 of the metal-oxide-semiconductor U2 is connected by divider resistance R1 with distance light end VH+, while the pin 4 and voltage stabilizing
Diode W1 negative electrode is connected, and the plus earth of the voltage-regulator diode W1, the pin 4 is grounded by bleeder resistance R2；
The pin 1,2,3 of the metal-oxide-semiconductor U2 is simultaneously connected after connecing by resistance RS1, RS2 with chip U1 CS pins, the pin of metal-oxide-semiconductor
5th, 6,7,8 and be connected by resistance RS3, RS4 with chip U1 CS pins after connecing, described resistance RS1, RS2, RS3, RS4 with
It is connected while chip U1 CS pins connection with the negative electrode of the light emitting diode in the LED illumination module.
When power supply is added between distance light end VH+ and GND, DC voltage electrode passes through divider resistance R1 and metal-oxide-semiconductor U2 electricity
Connection, the voltage that is at this moment added on metal-oxide-semiconductor U2 pins 4 so that metal-oxide-semiconductor U2 is turned on, now sampling resistor resistance be RS1, RS2,
RS3 and RS4 parallel resistance resistance；When power supply is added between dipped beam end VL+ and GND, at this moment it is added on metal-oxide-semiconductor U2 pins 4
Voltage be 0, metal-oxide-semiconductor U2 shut-off, now sampling resistor resistance be RS1 and RS2 parallel resistance resistance；Pass through metal-oxide-semiconductor U2's
Conducting and shut-off, so as to change the size of sampling resistor, then change the size of output current, reach the mesh of distance-light switching
's.In power MOS pipe two ends parallel connection one voltage-regulator diode W1 and bleeder resistance R2, protection and quick pass are played to metal-oxide-semiconductor U2
Disconnected effect.
In one embodiment, there is voltage-releasing voltage stabilizer inside U1, when dc source occurs to change between 9-30V,
It can guarantee that the output of driving LED constant currents.
In one embodiment, U1 internal temperature compensations circuit can compensate for the outside line loss of PCB and system application.Work as knot
Temperature or power output rise, and CS voltages can be compensated.Overheat protector function is provided with inside U1, to ensure that system is reliable and stable
Work.When IC chip temperatures exceed 150 DEG C, IC is that can enter guard mode and stop electric current output, and when temperature is less than
When 125, IC is that can reform into working condition.
In one embodiment, the light emitting diode array structure in LED illumination unit D is multiple branch circuit parallel connection or single spur track string
Connection form.
In one embodiment, step-down current constant control chip U1 is XL3003 cake cores, and metal-oxide-semiconductor U2 is F7821 cake cores.
The present invention has only used a drive circuit, has saved cost；What distance-light switching changed is all LED brightness,
Control effect is good, peripheral circuit is simple, small power consumption；Metal-oxide-semiconductor built in driving chip, has saved cost；Using step-down constant current chip,
It is less than the occasion of input voltage suitable for output voltage.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as；Also, each technical characteristic listed above, it is mutually combined
Each embodiment can be formed, should be considered as belonging to the scope of description of the invention record.For the common skill of this area
For art personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to this hair
Bright protection domain.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (9)
1. a kind of constant current driver circuit for LED using step-down constant current driving unit, it is characterised in that described to be driven using step-down constant current
The constant current driver circuit for LED of moving cell includes dc source, reverse polarity protection's unit, step-down constant current driving unit and distance-light list
Member, the dc source provides two kinds of power supplys of distance light end power supply and dipped beam end power supply, the input of reverse polarity protection's unit
The dc source is connected to, and reverse polarity protection, the step-down constant current driving unit are carried out to the constant current driver circuit for LED
Power input be connected to the output end of reverse polarity protection's unit, the distance light of reverse polarity protection's unit will be have passed through
Hold power supply or dipped beam end power supply to carry out step-down constant current, and the distance light end power supply or dipped beam end power supply that are depressured after constant current are supplied to
LED illumination unit, to drive the LED illumination unit, the far and near light unit is connected to the dc source, the reversed polarity
Protection location, the step-down constant current driving unit and the LED illumination unit, receive the distance light end electricity that the dc source is provided
Source or dipped beam end power supply, and control the LED illumination unit to carry out the switching between distance light end and dipped beam end；The reversed polarity is protected
Protecting unit includes distance light end Schottky diode and dipped beam end Schottky diode, the anode of distance light end Schottky diode
It is connected to the positive pole of the distance light end power supply of the dc source, the anode of dipped beam end Schottky diode is connected to described straight
Flow the negative electrode of the positive pole of the dipped beam end power supply of power supply, distance light end Schottky diode and dipped beam end Schottky diode
Connect together, and be connected to the power input of the step-down constant current driving unit.
2. the constant current driver circuit for LED as claimed in claim 1 using step-down constant current driving unit, it is characterised in that described
Being depressured constant current driving unit includes step-down current constant control chip, energy storage inductor, the first electrodeless electric capacity and fly-wheel diode, the drop
The power input pin of pressure current constant control chip is connected to the output end of reverse polarity protection's unit, the step-down current constant control
The grounding pin ground connection of chip, the CS pins of the step-down current constant control chip are connected in the LED illumination unit luminous two
The negative electrode of pole pipe, one end of first electrodeless electric capacity is connected to the power input pin of the step-down current constant control chip, separately
One end is connected to the VC pins of the step-down current constant control chip, and one end of the energy storage inductor is connected to the step-down constant current control
The SW pins of coremaking piece, the other end is connected to the anode of light emitting diode in the LED illumination unit, the fly-wheel diode
Plus earth, negative electrode is connected to the SW pins of the step-down current constant control chip.
3. the constant current driver circuit for LED as claimed in claim 2 using step-down constant current driving unit, it is characterised in that described
Step-down constant current driving unit also has electrode capacitance including first, and first positive pole for having electrode capacitance is connected to the energy storage inductor
The other end, negative pole ground connection.
4. the constant current driver circuit for LED as claimed in claim 3 using step-down constant current driving unit, it is characterised in that described
Step-down constant current driving unit also has electrode capacitance including the second electrodeless electric capacity and second, and second positive pole for having electrode capacitance is connected to
The output end of reverse polarity protection's unit, negative pole ground connection, second electrodeless electric capacity, which is parallel to described second, electrode capacitance
Positive pole and negative pole.
5. the constant current driver circuit for LED as claimed in claim 4 using step-down constant current driving unit, it is characterised in that described
First electrodeless electric capacity and second electrodeless electric capacity are ceramic condenser, and described first has electrode capacitance and described second to have the electrode capacitance to be
Electrochemical capacitor.
6. the constant current driver circuit for LED using step-down constant current driving unit as described in claim 1 or 2 or 4, its feature exists
In the far and near light unit includes metal-oxide-semiconductor, the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling electricity
Resistance and divider resistance, one end of the divider resistance are connected to the positive pole of the distance light end power supply of the dc source, and the other end connects
It is connected to the pin 4 of the metal-oxide-semiconductor, the pin 1,2,3 of the metal-oxide-semiconductor and after connecing is connected to described first be connected in parallel and adopted
One end of sample resistance and second sampling resistor, first sampling resistor and second sampling resistor being connected in parallel
The other end be connected to the CS pins of the step-down current constant control chip, the pin 5,6,7,8 of the metal-oxide-semiconductor and after connecing, connection
In the 3rd sampling resistor being connected in parallel and one end of the 4th sampling resistor, the described 3rd be connected in parallel adopts
The other end of sample resistance and the 4th sampling resistor is connected to the CS pins of the step-down current constant control chip.
7. the constant current driver circuit for LED as claimed in claim 6 using step-down constant current driving unit, it is characterised in that described
Far and near light unit also includes bleeder resistance and voltage-regulator diode, and one end of the bleeder resistance is connected to the pin of the metal-oxide-semiconductor
4, other end ground connection, the negative electrode of the voltage-regulator diode is connected to the pin 4 of the metal-oxide-semiconductor, plus earth.
8. the constant current driver circuit for LED as claimed in claim 1 or 2 using step-down constant current driving unit, it is characterised in that institute
Stating LED illumination unit includes light emitting diode matrix, and the LED array structure is multiple branch circuit parallel connection or single spur track string
Connection form.
9. a kind of LED automobile illumination device, it is characterised in that the LED automobile illumination device includes any in claim 1-8
The constant current driver circuit for LED using step-down constant current driving unit described in.
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| CN201510009852.1A CN104582183B (en) | 2015-01-09 | 2015-01-09 | A kind of constant current driver circuit for LED and device using step-down constant current driving unit |
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| CN104582183B true CN104582183B (en) | 2017-07-11 |
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| TWI669987B (en) | 2018-05-11 | 2019-08-21 | 群光電能科技股份有限公司 | Light source switching system |
| CN110351931A (en) * | 2019-08-09 | 2019-10-18 | 浙江阳光美加照明有限公司 | A kind of LED drive circuit with small night lamp function |
| CN113709418A (en) * | 2021-08-26 | 2021-11-26 | 洛阳瑞光影视光电技术有限公司 | Monitor with photometry function |
| CN116887478B (en) * | 2023-08-01 | 2024-03-29 | 广州威博智能科技股份有限公司 | Synchronous rectification automobile LED lamp driving circuit |
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| CN204377199U (en) * | 2015-01-09 | 2015-06-03 | 嘉兴市光泰照明有限公司 | Adopt constant current driver circuit for LED and the device of step-down constant current driving unit |
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| CN101815382B (en) * | 2010-04-02 | 2012-11-28 | 上海小糸车灯有限公司 | Step-down constant current LED drive circuit for automobile lighting |
| CN202818699U (en) * | 2012-08-16 | 2013-03-20 | 重庆雷本光电科技有限公司 | LED automotive headlamp drive circuit |
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| CN204377199U (en) * | 2015-01-09 | 2015-06-03 | 嘉兴市光泰照明有限公司 | Adopt constant current driver circuit for LED and the device of step-down constant current driving unit |
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