CN107466132A - A kind of intelligent drive circuit of LED car lamp - Google Patents
A kind of intelligent drive circuit of LED car lamp Download PDFInfo
- Publication number
- CN107466132A CN107466132A CN201710743732.3A CN201710743732A CN107466132A CN 107466132 A CN107466132 A CN 107466132A CN 201710743732 A CN201710743732 A CN 201710743732A CN 107466132 A CN107466132 A CN 107466132A
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- unit
- circuit
- control unit
- driver element
- sampling
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
The present invention provides a kind of intelligent drive circuit of LED car lamp, driver element, sampling unit and the gear selection unit being connected including control unit and with described control unit, the input of the driver element and the gear selection unit is respectively connecting to battery unit, the driver element and the sampling unit connect automotive lamp unit respectively, the sampling unit is also connected with the driver element, described control unit is also associated with monitoring unit, and the monitoring unit connects the driver element.The present invention solves the problems, such as the intelligent insufficient and high cost of existing LED lamp for vehicles actuation techniques.
Description
Technical field
The invention belongs to field of LED drive technology, and in particular to a kind of intelligent drive circuit of LED car lamp.
Background technology
LED belongs to electric current controlling semiconductor device, in order to ensure the uniformity of its brightness, the driving of generally use constant-current source
Circuit.For LED lamp for vehicles, reliably constant-current driving LED string, drive control device must possess accurate voltage and
Current regulation, protection circuit and dimming function.Therefore, design that a kind of voltage regulation performance is good and the drive circuit ten of constant current output
Divide necessity.
With the maturation of LED lamp for vehicles actuation techniques, driving control system species is also constantly increasing, LED lamp for vehicles
Tool requires that driving control system can reach output stabilization, and efficiency is again high, just can guarantee that driving control system tool is competitive excellent
Gesture.However, in the case where improving this advantage, the increase along with cost will also tend to so that what is become in competition is inferior.
Furthermore the species of drive circuit control system is various, and designed using PWM IC, with technology innovation and make
The demand of user, it is desirable to which driving control system has the trend that intelligent function turns into LED lamp for vehicles development, and existing PWM IC
It is difficult to meet this demand.
So how doing can just make driving control system have stable output, efficiency high, and cost is low, and expansible
Certain intelligent demand, it is real to have turned into practitioner in the art's technical problem urgently to be resolved hurrily.
The content of the invention
It is an object of the invention to provide a kind of intelligent drive circuit of LED car lamp, solves existing LED lamp for vehicles actuation techniques
The problem of intelligent insufficient and high cost.
The invention provides following technical scheme：
A kind of intelligent drive circuit of LED car lamp, including control unit and the driving list that is connected with described control unit
The input of member, sampling unit and gear selection unit, the driver element and the gear selection unit is respectively connecting to electricity
Pool unit, the driver element and the sampling unit connect automotive lamp unit respectively, and the sampling unit is also connected with the driving
Unit, described control unit are also associated with monitoring unit, and the monitoring unit connects the driver element.
Preferably, EMC filter units are additionally provided between the driver element and the battery unit, prevent from disturbing.
Preferably, rectification filtering unit is additionally provided between the driver element and the automotive lamp unit, makes driving current more
It is stable.
Preferably, the driver element is provided with booster circuit and controlled switch, and the booster circuit connects the EMC filtering
The output end of unit, the controlled switch connect the booster circuit, make the booster circuit output rise by opening and closing
Press signal.
Preferably, the sample circuit includes：No-voltage sample circuit, is connected to the booster circuit and the control is single
Member, the zero passage voltage of the booster circuit is sampled, and sampled signal is transferred to described control unit；Over-and under-voltage is adopted
Sample circuit, the automotive lamp unit and described control unit are connected to, the DC voltage for driving the automotive lamp unit are sampled,
And sampled signal is transferred to described control unit；Current sampling circuit, institute's automotive lamp unit and described control unit are connected to,
The DC current for driving the automotive lamp unit is sampled, and sampled signal is transferred to described control unit；The electricity
Stream sample circuit is flash transistor amplifier.
Preferably, the gear selection unit includes BIN voltage sampling circuits and gear voltage sampling circuit, the BIN
Voltage sampling circuit and gear voltage sampling circuit are connected with described control unit and the battery unit.
The beneficial effects of the invention are as follows：LED car lamp drive circuit controls the opening and closing of controlled switch by computing sampled signal,
Booster circuit is set to be in critical conduction mode all the time, reaching output, constant current is stable, and it is steady that above circuit can reach LED lamp for vehicles
Constant current driving and efficient purpose are pressed, and can effectively reduce cost, ensures the advantage of competition, and certain intelligence can be kept
Change.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Apply example to be used to explain the present invention together, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention.
Embodiment
As shown in figure 1, a kind of intelligent drive circuit of LED car lamp, including control unit and it is connected with control unit
The input of driver element, sampling unit and gear selection unit, driver element and gear selection unit is respectively connecting to battery
Unit, EMC filter units are additionally provided between driver element and battery unit, prevent from disturbing.Driver element and sampling unit difference
Automotive lamp unit is connected, rectification filtering unit is additionally provided between driver element and automotive lamp unit, makes driving current more stable.Sampling is single
Member is also connected with driver element, and control unit is also associated with monitoring unit, monitoring unit connection driver element.
Further, driver element is provided with booster circuit and controlled switch, and booster circuit connects the output of EMC filter units
End, controlled switch connection booster circuit, makes booster circuit export boost signal by opening and closing.Sample circuit includes：Zero
Voltage sampling circuit, booster circuit and control unit are connected to, the zero passage voltage of booster circuit is sampled, and sampling is believed
Number it is transferred to control unit；Over-and under-voltage sample circuit, automotive lamp unit and control unit are connected to, to the straight of driving automotive lamp unit
Stream voltage is sampled, and the control unit that sampled signal is transferred to；Current sampling circuit, it is connected to institute's automotive lamp unit and control
Unit processed, the DC current for driving automotive lamp unit is sampled, and the control unit that sampled signal is transferred to；Current sample
Circuit is flash transistor amplifier.Gear selection unit includes BIN voltage sampling circuits and gear voltage sampling circuit,
BIN voltage sampling circuits and gear voltage sampling circuit are connected with control unit and battery unit.
As shown in figure 1, a kind of intelligent drive circuit of LED car lamp, battery unit output current, is filtered through EMC filter circuit
After ripple, it is output to BOOST circuits and is boosted and be output to current rectifying and wave filtering circuit, exported after current rectifying and wave filtering circuit rectifying and wave-filtering
To automotive lamp unit, the string work of driving LED, and sampling unit monitors boosting output state always, and sampled signal is fed back to
Control unit, control unit control to adjust controlled switch again through computing, output is reached constant current stable.
Controlled switch is metal-oxide-semiconductor, and the grid of metal-oxide-semiconductor is connected with the I/O pins of control unit, and it receives single from control
The single pwm signal of member output, in the soft output PWM ripples of first time, MOS conductings, BOOST induction charging, a cycle
Complete, inductive current can not be mutated the diode through BOOST to electric capacity and load discharge, but the polarity of voltage of inductance this moment is reverse
And it is higher than supply voltage, and the inherent characteristic loaded according to the voltage of power supply unit and LED string, the two of BOOST after certain time
Pole pipe both end voltage maintains an equal level, the signal gathered this moment by no-voltage sample circuit, feeds back to control unit and goes triggering to produce newly
Single PWM ripples, so continuously form new PWM waveform, supply voltage is boosted in BOOST circuits, in the PWM ripples newly formed
Lower BOOST circuits will always be in critical conduction mode, thus reduces shortcoming in ccm mode and add under DCM patterns
Advantage.Control system will realize the stable constant current of output, also need to overcome unstable supply voltage, input and output various interference to be present and ask
Topic, this circuit also carries out high side current sampling in addition to being filtered on hardware to output, and feeds back to control unit, control unit
Sequential operation is carried out, adjusts controlled switch；And the over-and under-voltage sample circuit between car light and control unit is arranged at, will be right
Circuit plays a part of protection, so forms the negative feedback loop that software and hardware is combined and ensures that output is stable.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention is described in detail, for those skilled in the art, it still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic.All essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (6)
1. a kind of intelligent drive circuit of LED car lamp, it is characterised in that be connected including control unit and with described control unit
Driver element, sampling unit and gear selection unit, the input difference of the driver element and the gear selection unit
Battery unit is connected to, the driver element and the sampling unit connect automotive lamp unit respectively, and the sampling unit is also connected with
The driver element, described control unit are also associated with monitoring unit, and the monitoring unit connects the driver element.
A kind of 2. intelligent drive circuit of LED car lamp according to claim 1, it is characterised in that the driver element and
EMC filter units are additionally provided between the battery unit.
A kind of 3. intelligent drive circuit of LED car lamp according to claim 1, it is characterised in that the driver element and
Rectification filtering unit is additionally provided between the automotive lamp unit.
4. the intelligent drive circuit of a kind of LED car lamp according to claim 2, it is characterised in that the driver element is set
There are booster circuit and controlled switch, the booster circuit connects the output end of the EMC filter units, the controlled switch connection
The booster circuit, the booster circuit is made to export boost signal by opening and closing.
A kind of 5. intelligent drive circuit of LED car lamp according to claim 4, it is characterised in that the sample circuit bag
Include：No-voltage sample circuit, the booster circuit and described control unit are connected to, the zero passage voltage of the booster circuit is entered
Row sampling, and sampled signal is transferred to described control unit；Over-and under-voltage sample circuit, it is connected to the automotive lamp unit and institute
Control unit is stated, the DC voltage for driving the automotive lamp unit is sampled, and sampled signal is transferred to described control
Unit；Current sampling circuit, institute's automotive lamp unit and described control unit are connected to, the DC current to driving the automotive lamp unit
Sampled, and sampled signal is transferred to described control unit；The current sampling circuit is flash triode amplification electricity
Road.
6. the intelligent drive circuit of a kind of LED car lamp according to claim 1, it is characterised in that the gear selection is single
Member includes BIN voltage sampling circuits and gear voltage sampling circuit, the BIN voltage sampling circuits and gear voltage sampling circuit
It is connected with described control unit and the battery unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710743732.3A CN107466132A (en) | 2017-08-25 | 2017-08-25 | A kind of intelligent drive circuit of LED car lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710743732.3A CN107466132A (en) | 2017-08-25 | 2017-08-25 | A kind of intelligent drive circuit of LED car lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107466132A true CN107466132A (en) | 2017-12-12 |
Family
ID=60550605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710743732.3A Pending CN107466132A (en) | 2017-08-25 | 2017-08-25 | A kind of intelligent drive circuit of LED car lamp |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110972349A (en) * | 2018-09-27 | 2020-04-07 | Sl株式会社 | Luminance control device and method for vehicle lamp |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811473A (en) * | 2009-12-25 | 2010-08-25 | 奇瑞汽车股份有限公司 | LED light fault detection system |
| CN102729894A (en) * | 2011-04-02 | 2012-10-17 | 廖运昌 | LED (Light-Emitting Diode) car light monitoring system |
| CN103192759A (en) * | 2013-04-22 | 2013-07-10 | 长安大学 | System and method for controlling planar array LED vehicle lamp for vehicle meeting at night |
| CN203387728U (en) * | 2013-06-28 | 2014-01-08 | 上海信耀电子有限公司 | LED vehicle lamp controller |
-
2017
- 2017-08-25 CN CN201710743732.3A patent/CN107466132A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811473A (en) * | 2009-12-25 | 2010-08-25 | 奇瑞汽车股份有限公司 | LED light fault detection system |
| CN102729894A (en) * | 2011-04-02 | 2012-10-17 | 廖运昌 | LED (Light-Emitting Diode) car light monitoring system |
| CN103192759A (en) * | 2013-04-22 | 2013-07-10 | 长安大学 | System and method for controlling planar array LED vehicle lamp for vehicle meeting at night |
| CN203387728U (en) * | 2013-06-28 | 2014-01-08 | 上海信耀电子有限公司 | LED vehicle lamp controller |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110972349A (en) * | 2018-09-27 | 2020-04-07 | Sl株式会社 | Luminance control device and method for vehicle lamp |
| CN110972349B (en) * | 2018-09-27 | 2021-09-10 | Sl株式会社 | Luminance control device and method for vehicle lamp |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171212 |
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| RJ01 | Rejection of invention patent application after publication |