CN205902148U - Automobile -used high -power LED's control circuit - Google Patents
Automobile -used high -power LED's control circuit Download PDFInfo
- Publication number
- CN205902148U CN205902148U CN201620794676.7U CN201620794676U CN205902148U CN 205902148 U CN205902148 U CN 205902148U CN 201620794676 U CN201620794676 U CN 201620794676U CN 205902148 U CN205902148 U CN 205902148U
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- circuit
- control circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model belongs to the technical field of the circuit, especially, it includes MCU control circuit and SEPIC DCDC topology circuit to relate to an automobile -used high -power LED's control circuit, MCU control circuit keeps invariable through adjustment SEPIC DCDC topology circuit's the feasible LED load circuit's that flows through of voltage output electric current, MCU control circuit includes the adc ADC module, digital controlled oscillator NCO module and complementary waveform generator CWG module. The utility model discloses based on digital SMPS SEPIC topological structure has improved the stability of the luminous luminance of automobile -used high -power LED, still provides LED's overvoltage protection, undervoltage protection, open circuit protection and short -circuit protection simultaneously for LED's luminance does not receive its operating voltage's change and changes, provides the solution of stabilizing luminous luminance, overvoltage protection and undervoltage protection of LED.
Description
Technical field
This utility model belongs to field of circuit technology, the control circuit of more particularly, to a kind of automobile-used high-power LED, and this is automobile-used
The control circuit of high-power LED is based on digital smps-sepic topological structure.
Background technology
The application popularization in automotive lighting field for the led at present is more and more wider, and on some automobiles, light fixture is led light entirely
Source.Led has the advantages that small volume, life-span length, cold light source, response time are short, but the brightness of led can be with by its work electricity
The change of stream and change, and led itself may be carried in by it its two ends running voltage too high or by its work
Electric current is excessive and is burned out.
High-power LED is mainly used in distance-light in headlamp, day portable lighter, front fog lamp, steering indicating light, Rear Fog Lamp and braking
Lamp.
Utility model content
The purpose of this utility model is the defect overcoming prior art means, and this utility model is by based on digital
Smps-sepic topological structure circuit, to improve the stability of led luminosity, can also provide the overvoltage protection of led simultaneously
Automatic shutdown circuitry and led short-circuit protection.When the control circuit operating voltage range of automobile-used high-power LED is 6～20v, energy
Enough electric currents by maintenance led will not occur saltus step to ensure that the brightness of led will not occur saltus step, also provide led mistake simultaneously
The functions such as pressure protection, under-voltage protection, open-circuit-protection, short-circuit protection and temperature detection.
The technical scheme realizing this utility model purpose is: a kind of control circuit of automobile-used high-power LED, including mcu control
Circuit processed and sepic dc/dc topological circuit, mcu control circuit is passed through to adjust the voltage output of sepic dc/dc topological circuit
Pass through the constant current hold of led load circuit, mcu control circuit includes analog-digital converter adc module, digital controlled oscillator
Nco module and complementary waveform generator cwg module, analog-digital converter adc module detects the current value of led load circuit, and mcu is controlled
The operation processing unit of circuit processed calculates side-play amount according to the current value that analog-digital converter adc module detects, mcu control circuit
Operation processing unit adjusts the dutycycle of pwm ripple, complementary waveform generator according to side-play amount by digital controlled oscillator nco module
Cwg module is connected with digital controlled oscillator nco module, and the operation processing unit of mcu control circuit passes through complementary waveform generator
The voltage output of the output adjustment sepic dc/dc topological circuit of cwg module.
As prioritization scheme of the present utility model, sepic dc/dc topological circuit includes switching mos pipe q1, switch mos pipe
Q1 is connected with complementary waveform generator cwg module.
As prioritization scheme of the present utility model, the control circuit of automobile-used high-power LED also includes led open-circuit-protection electricity
Road, led open loop protection circuit includes Npn triode q2, resistance r9 and resistance r10, and resistance r9 and resistance r10 are used for measuring led
Output voltage is simultaneously delivered to base stage, the colelctor electrode of Npn triode q2 and the mcu of Npn triode q2 by the output voltage of load circuit
The reset foot of control circuit is connected.
As prioritization scheme of the present utility model, the control circuit of automobile-used high-power LED also includes led overvoltage protection electricity
Road, led overvoltage crowbar includes resistance r5 and resistance r6, mcu control circuit also include comparator comparator module and
Digital to analog converter dac module, one end of resistance r5 connects input power, and the other end of resistance r5 connects one end of resistance r6, electricity
The other end ground connection of resistance r6, the other end of resistance r5 connects the negative pole of comparator comparator module, digital to analog converter dac mould
Block connects the positive pole of comparator comparator module.
As prioritization scheme of the present utility model, the control circuit of automobile-used high-power LED also includes led short-circuit protection electricity
Road, led short-circuit protection circuit includes resistance r7, and resistance r7 is connected with led load circuit, the analog-digital converter of mcu control circuit
The voltage of adc module detection resistance r7.
As prioritization scheme of the present utility model, the control circuit of automobile-used high-power LED also includes output filter circuit, defeated
Enter supply voltage through sepic dc/dc topological circuit conversion after enter output filter circuit, output filter circuit filtering interfering and
Power for led load circuit after noise.
This utility model has positive effect: this utility model is based on digital smps-sepic topological structure, carries
The high stability of automobile-used high-power LED luminosity, additionally provides the overvoltage protection of led, under-voltage protection, open-circuit-protection simultaneously
With short-circuit protection so that the brightness of led is not changed by the change of its running voltage, there is provided a kind of stablize led luminosity,
Overvoltage protection and the solution of under-voltage protection.
Brief description
In order that content of the present utility model is easier to be clearly understood, below according to specific embodiment and with reference to attached
Figure, is described in further detail to this utility model.
Fig. 1 is circuit theory diagrams of the present utility model；
Fig. 2 is control method flow chart of the present utility model.
Wherein, 1, mcu control circuit, 2, sepic dc/dc topological circuit, 3, led load circuit, 4, led open-circuit-protection
Circuit, 5, output filter circuit, 6, ldo circuit.
Specific embodiment
As shown in figure 1, the utility model discloses a kind of control circuit of automobile-used high-power LED, including mcu control circuit
1 and sepic dc/dc topological circuit 2, mcu control circuit 1 is made by the voltage output adjusting sepic dc/dc topological circuit 2
The constant current hold of led load circuit 3 must be flowed through, mcu control circuit 1 includes analog-digital converter adc module, digital controlled oscillator
Nco module and complementary waveform generator cwg module, analog-digital converter adc module detects the current value of led load circuit 3, mcu
The operation processing unit of control circuit 1 calculates side-play amount according to the current value that analog-digital converter adc module detects, mcu controls electricity
The operation processing unit on road 1 adjusts the dutycycle of pwm ripple according to side-play amount by digital controlled oscillator nco module, and complementary waveform is sent out
Raw device cwg module is connected with digital controlled oscillator nco module, and the operation processing unit of mcu control circuit 1 is sent out by complementary waveform
The voltage output of the output adjustment sepic dc/dc topological circuit 2 of raw device cwg module.Wherein, sepic dc/dc topological circuit 2
Allow output voltage to be more than, be less than or equal to input voltage.
Sepic dc/dc topological circuit 2 includes switching mos pipe q1, switch mos pipe q1 and complementary waveform generator cwg mould
Block is connected.Wherein, sepic dc/dc topological circuit 2 output voltage to be controlled by the dutycycle switching mos pipe q1.
Keep the principle constant by the curtage of led load circuit 3: if by the electric current of led load circuit 3
Change, now, analog-digital converter adc module detects the current value of led load circuit 3, is then calculated partially by pid algorithm
Shifting amount, the operation processing unit of mcu control circuit 1 is passed through to adjust the dutycycle that digital controlled oscillator nco module adjusts pwm ripple, mcu
The operation processing unit of control circuit 1 passes through the output adjustment sepic dc/dc topological circuit of complementary waveform generator cwg module
2 voltage output, so that the current value flowing through led load circuit 3 is constant.
The control circuit of automobile-used high-power LED also includes led open loop protection circuit 4, and led open loop protection circuit 4 includes npn
Audion q2, resistance r9 and resistance r10, resistance r9 and resistance r10 be used for measure led load circuit 3 output voltage and will be defeated
Go out the base stage that voltage delivers to Npn triode q2, the colelctor electrode of Npn triode q2 is connected with the reset foot of mcu control circuit 1.
Led open-circuit-protection principle: when led load circuit 3 is opened a way, the output voltage of led load circuit 3 will increase,
Now Npn triode q2 conducting, the reset foot ground connection of mcu control circuit 1, mcu control circuit 1 resets and quits work.
The control circuit of automobile-used high-power LED also includes led overvoltage crowbar, and led overvoltage crowbar includes resistance
R5 and resistance r6, mcu control circuit 1 also includes comparator comparator module and digital to analog converter dac module, resistance r5's
One end connects input power, and the other end of resistance r5 connects one end of resistance r6, the other end ground connection of resistance r6, and resistance r5's is another
One end connects the negative pole of comparator comparator module, and digital to analog converter dac module connects comparator comparator module
Positive pole.
Overvoltage protection principle: the voltage of input power is entered comparator comparator mould by resistance r5 and resistance r6 partial pressure
The negative pole of block, the positive pole of comparator comparator module connects digital to analog converter dac module, arranges overpressure value, when input electricity
When pressing through pressure, and the complementary waveform generator cwg module that is connected of comparator comparator module closes the output of pwm waveform
And close the switch mos pipe q1 of sepic dc/dc topological circuit 2, thus realizing circuit protection.
Under-voltage protection principle: the voltage of input power by resistance r5 and resistance r6 partial pressure, when the modulus of mcu control circuit 1
When transducer adc module detects the minimum voltage that input voltage is less than setting running voltage, by complementary waveform generator cwg
Module closes the switch mos pipe q1 exporting and closing sepic dc/dc topological circuit 2 of pwm waveform, realizes under-voltage protection.
The control circuit of automobile-used high-power LED also includes led short-circuit protection circuit, and led short-circuit protection circuit includes resistance
R7, resistance r7 is connected with led load circuit 3, the voltage of analog-digital converter adc module detection resistance r7 of mcu control circuit 1.
Short-circuit protection principle: when one or more of led load circuit 3 led short circuit, by led load circuit 3
Electric current can increase in moment, when the voltage of analog-digital converter adc module detection resistance r7 of mcu control circuit 1 is more than rated value
1.3 times and persistent period are more than 30ms, then mcu control circuit 1 stops output, turn off the control electricity of entirely automobile-used high-power LED
Road.
The control circuit of automobile-used high-power LED also includes output filter circuit 5, and input supply voltage is through sepic dc/dc
Enter output filter circuit 5 after topological circuit 2 conversion, be led load circuit 3 after output filter circuit 5 filtering interfering and noise
Power supply.Keep stable by the control circuit overall performance that output filter circuit 5 makes automobile-used high-power LED.
In addition, the control circuit of automobile-used high-power LED also includes ldo circuit 6, wherein, ldo circuit 6 is mainly mcu and controls
Circuit 1 is powered and is provided reference voltage.
In circuit theory diagrams in Fig. 1, the cwg of mark is the abbreviation of complementary waveform generator cwg module, and nco is numerical control vibration
The abbreviation of device nco module, comp is the abbreviation of comparator comparator module, and dac is the contracting of digital to analog converter dac module
Write, adc is the abbreviation of analog-digital converter adc module.
Additionally it is possible to provide the junction temperature function of detection led load circuit 3, occurred by the voltage at critesistor two ends
Detecting the junction temperature of led load circuit 3, mcu control circuit 1 adjusts the output of pwm dutycycle to balance led load circuit for change
3 junction temperature.
As shown in Fig. 2 being interrupted using intervalometer timer timing, by analog-digital converter adc module channels flag bit
The value (0 or 1) of adcmode executing the selection of analog-digital converter adc module channels,
When the value of adcmode is 0, analog-digital converter adc module reads input voltage value, next will determine that this voltage
Whether it is less than under-voltage protection threshold value, under-voltage protection threshold value is the minimum voltage 6v of running voltage, if input voltage value is less than owed
Pressure rotection thresholds, the operation processing unit of mcu control circuit 1 is passed through complementary waveform generator cwg module and is closed the defeated of pwm waveform
Go out thus closing sepic dc/dc topological circuit 2, that is, close the switch mos pipe q1 of sepic dc/dc topological circuit 2, realize defeated
Enter the under-voltage protection of voltage, if input voltage value is more than under-voltage protection threshold value, this time Interruption will not execute operation；Its
In, input voltage value refers to the input voltage value of sepic dc/dc topological circuit 2.
When the value of adcmode is 1, analog-digital converter adc module reads the current value flowing through led load circuit 3, connects down
Will determine that whether this electric current is more than the short-circuit protection threshold value of led, wherein, the short-circuit protection threshold value of led is that operating current is specified
1.3 times of value i.e. 2a, if the current value flowing through led load circuit 3 is more than the short-circuit protection threshold value of led, mcu control circuit 1
Operation processing unit pass through complementary waveform generator cwg module and close the output of pwm waveform to open up thus closing sepic dc/dc
Flutter circuit 2, that is, close the switch mos pipe q1 of sepic dc/dc topological circuit 2, realize the short-circuit protection of led load circuit 3；
If the current value flowing through led load circuit 3 is less than the short-circuit protection threshold value of led, the computing of mcu control circuit 1
Passing ratio-Integrated Derivative pid algorithm is calculated output current side-play amount, the calculation process of mcu control circuit 1 by processing unit
Unit passes through to adjust the dutycycle that digital controlled oscillator nco module adjusts pwm ripple, and the operation processing unit of mcu control circuit 1 is passed through
The voltage output of the output adjustment sepic dc/dc topological circuit 2 of complementary waveform generator cwg module, so that flow through led
The current value of load circuit 3 is constant.
It is constant by the current stabilization of led load circuit 3 that the operation processing unit of mcu control circuit 1 carries out configuration realization
With functions such as overvoltage, under-voltage protections.All these resource modules all carry out suitable configuration by software and connect together in fact
Now maintain and function is automatically shut down etc. by the current stabilization not saltus step of led load circuit 3 and overvoltage protection.
Particular embodiments described above, has carried out entering one to the purpose of this utility model, technical scheme and beneficial effect
Step describes in detail, be should be understood that and the foregoing is only specific embodiment of the utility model, is not limited to this
Utility model, all of the present utility model spirit and principle within, any modification, equivalent substitution and improvement done etc., all should wrap
It is contained within protection domain of the present utility model.
Claims (6)
1. a kind of control circuit of automobile-used high-power LED it is characterised in that: include mcu control circuit (1) and sepic dc/dc
Topological circuit (2), described mcu control circuit (1) is made by the voltage output adjusting sepic dc/dc topological circuit (2)
Flow through the constant current hold of led load circuit (3), described mcu control circuit (1) includes analog-digital converter adc module, number
Controlled oscillator nco module and complementary waveform generator cwg module, described analog-digital converter adc module detects led load circuit
(3) current value, the operation processing unit of mcu control circuit (1) calculates according to the current value that analog-digital converter adc module detects
Side-play amount, the operation processing unit of mcu control circuit (1) adjusts pwm ripple according to side-play amount by digital controlled oscillator nco module
Dutycycle, complementary waveform generator cwg module is connected with digital controlled oscillator nco module, at the computing of mcu control circuit (1)
Reason unit passes through the voltage output of output adjustment sepic dc/dc topological circuit (2) of complementary waveform generator cwg module.
2. a kind of automobile-used high-power LED according to claim 1 control circuit it is characterised in that: described sepic
Dc/dc topological circuit (2) includes switch mos pipe q1, and described switch mos pipe q1 is connected with complementary waveform generator cwg module
Connect.
3. a kind of automobile-used high-power LED according to claim 2 control circuit it is characterised in that: described automobile-used big work(
The control circuit of rate led also includes led open loop protection circuit (4), and described led open loop protection circuit (4) includes Npn triode
Q2, resistance r9 and resistance r10, described resistance r9 and resistance r10 is used for measuring the output voltage of led load circuit (3) will be defeated
Go out the base stage that voltage delivers to Npn triode q2, the colelctor electrode of Npn triode q2 is connected with the reset foot of mcu control circuit (1)
Connect.
4. a kind of automobile-used high-power LED according to claim 2 control circuit it is characterised in that: described automobile-used big work(
The control circuit of rate led also includes led overvoltage crowbar, and described led overvoltage crowbar includes resistance r5 and resistance r6, institute
The mcu control circuit (1) stated also includes comparator comparator module and digital to analog converter dac module, one end of resistance r5
Connect input power, the other end of resistance r5 connects one end of resistance r6, the other end ground connection of resistance r6, the other end of resistance r5
Connect the negative pole of comparator comparator module, digital to analog converter dac module is just connecting comparator comparator module
Pole.
5. a kind of automobile-used high-power LED according to claim 2 control circuit it is characterised in that: described automobile-used big work(
The control circuit of rate led also includes led short-circuit protection circuit, and described led short-circuit protection circuit includes resistance r7, described electricity
Resistance r7 is connected with led load circuit (3), the voltage of analog-digital converter adc module detection resistance r7 of mcu control circuit (1).
6. a kind of automobile-used high-power LED according to claim 2 control circuit it is characterised in that: described automobile-used big work(
The control circuit of rate led also includes output filter circuit (5), and input supply voltage is changed through sepic dc/dc topological circuit (2)
Enter output filter circuit (5) afterwards, be that led load circuit (3) is powered after output filter circuit (5) filtering interfering and noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620794676.7U CN205902148U (en) | 2016-07-27 | 2016-07-27 | Automobile -used high -power LED's control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620794676.7U CN205902148U (en) | 2016-07-27 | 2016-07-27 | Automobile -used high -power LED's control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205902148U true CN205902148U (en) | 2017-01-18 |
Family
ID=57785294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620794676.7U Active CN205902148U (en) | 2016-07-27 | 2016-07-27 | Automobile -used high -power LED's control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205902148U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666732A (en) * | 2016-07-27 | 2018-02-06 | 常州星宇车灯股份有限公司 | A kind of control circuit and control method of automobile-used great power LED |
| CN109274065A (en) * | 2018-11-23 | 2019-01-25 | 深圳市道通智能航空技术有限公司 | A kind of monitoring circuit, battery and aircraft |
-
2016
- 2016-07-27 CN CN201620794676.7U patent/CN205902148U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666732A (en) * | 2016-07-27 | 2018-02-06 | 常州星宇车灯股份有限公司 | A kind of control circuit and control method of automobile-used great power LED |
| CN107666732B (en) * | 2016-07-27 | 2024-03-29 | 常州星宇车灯股份有限公司 | Control circuit and control method for high-power LED for vehicle |
| CN109274065A (en) * | 2018-11-23 | 2019-01-25 | 深圳市道通智能航空技术有限公司 | A kind of monitoring circuit, battery and aircraft |
| CN109274065B (en) * | 2018-11-23 | 2020-06-02 | 深圳市道通智能航空技术有限公司 | Monitoring circuit, battery and aircraft |
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| GR01 | Patent grant |