CN201282585Y - Driver of automobile LED head light - Google Patents
Driver of automobile LED head light Download PDFInfo
- Publication number
- CN201282585Y CN201282585Y CNU2008201619521U CN200820161952U CN201282585Y CN 201282585 Y CN201282585 Y CN 201282585Y CN U2008201619521 U CNU2008201619521 U CN U2008201619521U CN 200820161952 U CN200820161952 U CN 200820161952U CN 201282585 Y CN201282585 Y CN 201282585Y
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- led
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- capacitor
- effect transistor
- field effect
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Abstract
The utility model relates to an automobile LED head light driver. A driving circuit comprises a driving chip IC, a filter circuit, a temperature-controlled feedback resistor RT, a field transistor Q and a voltage stabilizing circuit; the filter circuit is connected with a direct current power supply, the temperature-controlled feedback resistor RT is connected between the cathode of the direct current power supply and the input detecting terminal of the driving chip IC, a tank circuit comprising a capacitor C2 and an inductor L2 in series connection is connected between the drain electrode of the field transistor Q and the cathode of the light emitting diode (LED), the anode of the LED is connected with the source electrode of the field transistor Q, and the grid electrode of the field transistor Q is connected with the driving terminal of the driving chip IC; a RC suppression circuit comprising a resistor Rd and a capacitor Cd in series connection is connected with a capacitor C2 in parallel and then connected with the power supply input terminal of the driving chip IC; and the voltage stabilizing circuit comprising a voltage stabilizing diode D3 and a voltage dividing resistor R2 is connected with the two ends of the LED in parallel. The automobile LED head light driver has the advantages of multiple protection functions, stable and accurate driving, reliable operation, and high lighting efficiency.
Description
Technical field
The utility model relates to a kind of automobile LED headlamp driver, belongs to automobile-used lighting technology.
Background technology
Along with the generally use of great power LED in light decoration and illumination, great power LED drives and seems more and more important.Drive great power LED and need solve the constant current problem, also will possess the reliability of whole LED driver,, embody energy-conserving and environment-protective, possess problems such as higher efficient and power factor (PF) again in LED green illumination field.
At present, the development of car lighting forward great power LED, but because of battery power in the car is all adopted in automobile-used illumination, vehicle travel and docking process in, supply voltage is extremely unstable, makes the driver drives less stable, the damage that easily causes LED to shift to an earlier date, especially for the large-power light-emitting diodes LED of 15W, it is low to drive reliability, is restricting the development of automobile-used large-power light-emitting diodes LED illumination.
Summary of the invention
The purpose of this utility model provides a kind of kinds of protect function that has, and driving is stable, accurate, the driver of the automobile-used LED headlamp of reliable operation.
The utility model is that the technical scheme that achieves the above object is: a kind of automobile LED headlamp driver, comprise can and be installed in the interior drive circuit of can, it is characterized in that: described drive circuit comprises chip for driving IC, filter circuit, accumulator, field effect transistor Q and voltage stabilizing circuit and LED; Described filter circuit comprises capacitor C
1, diode D
1And inductance L
1, capacitor C
1Be connected in parallel on the positive and negative terminal of DC power supply, be connected on the diode D of dc power anode
1And inductance L
1Be connected on field effect transistor Q drain electrode after the series connection, temperature control feedback resistance RT be connected between dc power cathode and the field effect transistor Q source electrode after resistance R connect, and temperature control feedback resistance RT exports termination chip for driving IC and imports the test side; Capacitor C
2And inductance L
2The accumulator that series connection constitutes is connected between field effect transistor Q drain electrode and the LED negative pole, and the LED positive pole connects field effect transistor Q source electrode, and field effect transistor Q grid connects chip for driving IC drive end; Resistance R
dAnd capacitor C
dThe RC that series connection constitutes suppresses circuit and capacitor C
2Connect chip for driving IC power input after the parallel connection; Voltage stabilizing circuit comprises voltage stabilizing didoe D
3With divider resistance R
2, be connected the voltage stabilizing didoe D between LED negative pole and the chip for driving IC output test side
3And be connected that LED is anodal to export divider resistance R between the test side with chip for driving IC
2Be connected in parallel on the LED two ends.
The utility model is installed in drive circuit in the can, utilizes principle of electromagnetic shield-ing, electromagnetic interference can be decreased to minimumly, optimizes driver effectively, and the influence of other electronic devices of car load is reduced to minimum.The utility model has increased diode D in filter circuit
1, when running into reverse voltage, this diode D
1Play and prevent that reverse voltage from puncturing the effect of LED.The utility model LED and voltage stabilizing didoe D
3Parallel connection when extraneous supply voltage fluctuation or load both end voltage take place changes, can prevent effectively that also overvoltage from damaging drive circuit.The utility model is connected to temperature control feedback resistance RT at the negative pole of power supply, suppresses to prevent the too high overcurrent that causes of temperature, overvoltage damage drive circuit by temperature control feedback resistance RT.The utility model is at storage capacitor C
2On be parallel with RC and suppress circuit, the surge voltage of can prevent from prominently to open, hang-up being brought punctures circuit, damages element.Drive circuit of the present utility model has the kinds of protect function, under the extremely unsettled prerequisite of supply voltage, can stablize, accurately drive the large-power light-emitting diodes LED work of 15W.Driver of the present utility model is owing to can provide the constant-current power supply of pulse, the frequency of its current impulse and duty ratio can be adjusted, this makes LED can be in the intermittently used situation, and the LED temperature rise is slow, has prolonged the useful life of large-power light-emitting diodes LED.In addition, driver of the present utility model is a high-frequency work, can make full use of the afterglow effect of phosphor powder in the LED, does not only have the scintillation of light, can also further improve the luminous efficiency of LED.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the circuit theory diagrams of the utility model drive circuit.
Wherein: 1-metal end, 2-metal shell, 3-circuit board.
Embodiment
See shown in Figure 1; automobile LED headlamp driver of the present utility model; comprise that can is installed in the drive circuit in the can, this can is assembled by metal shell 2 and metal end 1, and drive circuit is connected on the circuit board 3; utilize shielding conductor to connect drive circuit and LED; to have played good electrostatic protection and electromagnetic shielding action, reach good EMC environment, and can helps heat radiation; prevent that chip temperature is too high, lifetime.
See shown in Figure 2, drive circuit of the present utility model comprises chip for driving IC, filter circuit, accumulator, temperature control feedback resistance RT, field effect transistor Q and voltage stabilizing circuit and LED, this field effect transistor Q adopts N-channel MOS FET pipe, and chip for driving IC adopts automobile specified LED chip for driving such as AT9933, HV9930.
See shown in Figure 2ly, filter circuit of the present utility model comprises capacitor C
1, diode D
1And inductance L
1, capacitor C
1Be connected in parallel on the positive and negative terminal of DC power supply, be connected on the diode D of dc power anode
1With inductance L
1Be connected on field effect transistor Q drain electrode after the series connection, when the forward voltage conducting, because this diode D
1Almost do not have electrical impedance, be equivalent to lead; And when running into reverse voltage, this diode D
1The characteristic of itself just works, and prevents the reverse breakdown LED, plays the effect of protection.Temperature control feedback resistance RT be connected between dc power cathode and the field effect transistor Q source electrode after resistance R is connected; this temperature control feedback resistance RT output termination chip for driving IC input test side SS; this temperature control feedback resistance RT can adopt the PTC thermistor; under the running current, because the PTC thermistor is low resistive state, temperature raises in circuit; when electric current increases overrun; the PTC thermistor is high-impedance state, and electric current is reduced, and reaches protection drive circuit and LED.See shown in Figure 2, capacitor C
2With inductance L
2Series connection constitutes accumulator, capacitor C
2And inductance L
2Be connected between field effect transistor Q drain electrode and the LED negative pole, the LED positive pole connects field effect transistor Q source electrode, also is connected with diode D between field effect transistor Q drain electrode and the source electrode
2, playing the afterflow effect, field effect transistor Q grid connects chip for driving IC drive end, the break-make of chip for driving IC drive end GATE output signal control field effect transistor Q.See shown in Figure 2, resistance R
dAnd capacitor C
dSeries connection constitutes RC and suppresses circuit, is connected in parallel on capacitor C
2Meet chip for driving IC power input VIN behind the two ends, when meeting with uncontrollable overvoltage or overcurrent, as turn-offing overvoltage, the mutation voltage during unlatching is because inductance L
2And capacitor C
2Between form big voltage or big electric current, make the components and parts of drive circuit can be subjected to corresponding infringement, burn circuit when serious, suppress circuit by this RC and played certain dividing potential drop effect and effectively suppressed overvoltage and overcurrent phenomenon, provide a constant-current power supply to LED.This is shown in Figure 2, and voltage stabilizing circuit of the present utility model comprises voltage stabilizing didoe D
3With divider resistance R
2, be connected the voltage stabilizing didoe D between LED negative pole and the chip for driving IC output test side SS
3And the divider resistance R2 that is connected between LED positive pole and the chip for driving IC output test side SS is connected in parallel on the LED two ends, when fluctuation or load both end voltage take place and change in extraneous supply voltage, output voltage is also along with changing, if output voltage increases, according to the reverse breakdown characteristics of voltage stabilizing didoe, this voltage stabilizing didoe D
3Electric current just significantly increase, make divider resistance R
2On pressure drop increase, thereby reduced the impact of voltage for LED; When output voltage descended, the voltage stabilizing process was opposite, thereby kept the stable of output voltage.
When drive circuit inserts the 12V DC power supply, behind filter circuit, the accumulator energy storage, and make chip for driving IC work, and when chip for driving IC control field effect transistor Q opens, capacitor C
2Discharge, LED is lighted, and while voltage stabilizing circuit regulated output voltage, RC suppress circuit and prevent overvoltage surge, overcurrent, diode D
1Prevent that reverse voltage from puncturing circuit, temperature control feedback resistance RT prevents the too high overvoltage that causes of temperature, overcurrent damage drive circuit.
Claims (2)
1, a kind of automobile LED headlamp driver, comprise can and be installed in the interior drive circuit of can, it is characterized in that: described drive circuit comprises chip for driving IC, filter circuit, accumulator, field effect transistor Q and voltage stabilizing circuit and LED; Described filter circuit comprises capacitor C
1, diode D
1And inductance L
1, capacitor C
1Be connected in parallel on the positive and negative terminal of DC power supply, be connected on the diode D of dc power anode
1And inductance L
1Be connected on field effect transistor Q drain electrode after the series connection, temperature control feedback resistance RT be connected between dc power cathode and the field effect transistor Q source electrode after resistance R connect, and temperature control feedback resistance RT exports termination chip for driving IC and imports the test side; Capacitor C
2And inductance L
2The accumulator that series connection constitutes is connected between field effect transistor Q drain electrode and the LED negative pole, and the LED positive pole connects field effect transistor Q source electrode, and field effect transistor Q grid connects chip for driving IC drive end; Resistance R
dAnd capacitor C
dThe RC that series connection constitutes suppresses circuit and capacitor C
2Connect chip for driving IC power input after the parallel connection; Voltage stabilizing circuit comprises voltage stabilizing didoe D
3With divider resistance R
2, be connected the voltage stabilizing didoe D between LED negative pole and the chip for driving IC output test side
3And be connected that LED is anodal to export divider resistance R between the test side with chip for driving IC
2Be connected in parallel on the LED two ends.
2, automobile LED headlamp driver according to claim 1 is characterized in that: also be connected with diode D between described field effect transistor Q drain electrode and the source electrode
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201619521U CN201282585Y (en) | 2008-10-24 | 2008-10-24 | Driver of automobile LED head light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201619521U CN201282585Y (en) | 2008-10-24 | 2008-10-24 | Driver of automobile LED head light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201282585Y true CN201282585Y (en) | 2009-07-29 |
Family
ID=40929448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201619521U Expired - Lifetime CN201282585Y (en) | 2008-10-24 | 2008-10-24 | Driver of automobile LED head light |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201282585Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102202436A (en) * | 2010-03-23 | 2011-09-28 | 张志军 | Light-emitting diode (LED) unit and constant-current unit voltage-stabilizing light-emitting diode (LED) traffic signal lamp |
| CN101875328B (en) * | 2009-04-29 | 2012-07-04 | 海洋王照明科技股份有限公司 | Marker light device for locomotive |
| CN103517508A (en) * | 2012-06-14 | 2014-01-15 | 芯瑞科技股份有限公司 | Controller suitable for light-emitting diode and related light-emitting module |
| CN104111462A (en) * | 2013-04-19 | 2014-10-22 | 英飞凌科技股份有限公司 | Time Of Flight Illumination Circuit |
| CN104717774A (en) * | 2013-12-16 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Lamp over-voltage protection circuit and lighting equipment |
| CN109041343A (en) * | 2018-08-06 | 2018-12-18 | 广东德洛斯照明工业有限公司 | A kind of LED drive circuit of low electromagnetic |
-
2008
- 2008-10-24 CN CNU2008201619521U patent/CN201282585Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101875328B (en) * | 2009-04-29 | 2012-07-04 | 海洋王照明科技股份有限公司 | Marker light device for locomotive |
| CN102202436A (en) * | 2010-03-23 | 2011-09-28 | 张志军 | Light-emitting diode (LED) unit and constant-current unit voltage-stabilizing light-emitting diode (LED) traffic signal lamp |
| CN102202436B (en) * | 2010-03-23 | 2014-01-29 | 张志军 | Constant-current unit voltage-stabilizing light-emitting diode (LED) traffic signal lamp |
| CN103517508A (en) * | 2012-06-14 | 2014-01-15 | 芯瑞科技股份有限公司 | Controller suitable for light-emitting diode and related light-emitting module |
| CN104111462A (en) * | 2013-04-19 | 2014-10-22 | 英飞凌科技股份有限公司 | Time Of Flight Illumination Circuit |
| CN104717774A (en) * | 2013-12-16 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Lamp over-voltage protection circuit and lighting equipment |
| CN109041343A (en) * | 2018-08-06 | 2018-12-18 | 广东德洛斯照明工业有限公司 | A kind of LED drive circuit of low electromagnetic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090729 |