CN105682283B - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
- Publication number
- CN105682283B CN105682283B CN201511025378.8A CN201511025378A CN105682283B CN 105682283 B CN105682283 B CN 105682283B CN 201511025378 A CN201511025378 A CN 201511025378A CN 105682283 B CN105682283 B CN 105682283B
- Authority
- CN
- China
- Prior art keywords
- led
- signal
- voltage
- module
- drive circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000000052 comparative effect Effects 0.000 claims abstract description 23
- 241000023320 Luma <angiosperm> Species 0.000 claims abstract description 16
- OSWPMRLSEDHDFF-UHFFFAOYSA-N methyl salicylate Chemical compound COC(=O)C1=CC=CC=C1O OSWPMRLSEDHDFF-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000005070 sampling Methods 0.000 claims description 19
- 238000012544 monitoring process Methods 0.000 claims description 13
- 239000000919 ceramic Substances 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 description 29
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- 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]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED drive circuit, for improving the accuracy of light modulation.LED drive circuit provided by the invention includes voltage generation module, gloss egf block, control module and modular converter；Voltage generation module, for producing input voltage；Gloss egf block, for being sampled to obtain luma samples to LED lamplight；Control module is electrically connected with gloss egf block, modular converter respectively, for luma samples to be converted into data signal by analog signal, the luma samples of data signal are converted into compared with predetermined luminance, obtain the first comparative result, level controling signal is generated according to the first comparative result；Modular converter is electrically connected with control module, voltage generation module respectively, for input voltage to be adjusted according to level controling signal, according to the voltage follower circuit information after regulation, to cause the brightness of LED consistent with predetermined luminance.
Description
Technical field
The present invention relates to electronic equipment, more particularly to a kind of LED drive circuit.
Background technology
Light emitting diode (Light Emitting Diode, abbreviation LED) is a kind of solid light source, can be converted electrical energy into
For luminous energy, there is the advantages of low-power consumption, reliability is high, service life is long.
At present, LED drive circuit generally comprises：Power supply, current feedback circuit, control chip, current control circuit, filtering
Mu balanced circuit, filter regulator circuit include multiple FETs, inductance and electric capacity, as shown in Figure 1.Wherein, LED anode and power supply
Anode is connected, and current feedback circuit samples to output current, and control chip passes through current control circuit according to sample information
Output current is adjusted.
But current feedback circuit sampling precision is low, the processing digit of control chip is few, therefore passes through current control circuit
The precision that output current is adjusted is low, therefore the operating current error exported is big, therefore the accuracy dimmed is low.
The content of the invention
The invention provides a kind of LED drive circuit, for automatically adjusting LED luminance according to ambient brightness.
First aspect present invention provides a kind of LED drive circuit, including：
Voltage generation module, gloss egf block, control module and modular converter；
The voltage generation module, for producing input voltage；
The gloss egf block, for being sampled to obtain luma samples to LED lamplight；
The control module is electrically connected with the gloss egf block, the modular converter respectively, for by the brightness
Sample is converted to data signal by analog signal, is converted into the luma samples of data signal compared with predetermined luminance, obtains
To the first comparative result, level controling signal is generated according to first comparative result；
The modular converter is electrically connected with the control module, the voltage generation module respectively, for according to
The input voltage is adjusted level controling signal, according to the voltage follower circuit information after regulation, to cause the LED
The brightness of lamp is consistent with predetermined luminance, and the circuit information is voltage or electric current.
With reference in a first aspect, in the first implementation of first aspect present invention, the voltage generation module is negative pressure
Power supply, the voltage output end of the negative supply are connected with the voltage input end of the modular converter, the electricity of the modular converter
Pressure output end is used to connect LED.
With reference to the first implementation of first aspect, in second of implementation of first aspect present invention, the control
Molding block includes analog-digital converter, field programmable gate array FPGA, digital analog converter；
The analog-digital converter is electrically connected with the gloss egf block, the FPGA respectively, for by the brightness sample
This is converted to data signal by analog signal；
The FPGA is electrically connected with the analog-digital converter, the digital analog converter respectively, for being converted into numeral
The luma samples of signal obtain the first comparative result compared with predetermined luminance, and the is produced according to first comparative result
One control signal；
The digital analog converter, for first control signal to be converted into level controling signal.
With reference to second of implementation of first aspect, in the third implementation of first aspect present invention, described turn
Mold changing block includes direct current transducer and switch module, the voltage input end of the switch module and the voltage generation module
Voltage output end is connected, and the voltage output end of the switch module is used to connect LED；
The direct current transducer is electrically connected with the digital analog converter, the switch module respectively, for according to
Level controling signal, generate first switch control signal；
The switch module, for according to the first switch control signal, the input voltage to be adjusted, according to
Voltage follower circuit information after regulation.
It is described in the 4th kind of implementation of first aspect present invention with reference to the third implementation of first aspect
FPGA is additionally operable to generate the second control signal according to first comparative result；
The modular converter also includes pulse-width modulator and LED switch；
The pulse-width modulator is electrically connected with the FPGA, the direct current transducer respectively, for by described the
Two control signals are converted to square-wave signal；
The direct current transducer, it is additionally operable to generate second switch control signal according to the square-wave signal；
The both ends of the LED switch are connected with LED anode, LED cathode respectively, believe for being controlled according to the second switch
Number on and off circuit.
With reference to the third implementation of first aspect, in the 5th kind of implementation of first aspect present invention, described turn
Mold changing block also includes ceramic condenser, and the two poles of the earth of the ceramic condenser are connected with LED anode, LED cathode respectively；
The ceramic condenser, for being filtered to the output circuit of the modular converter.
With reference to a kind of implementation of first aspect any of the above, in the 6th kind of implementation of first aspect present invention, institute
Stating LED drive circuit also includes circuit information sampling module；
The circuit information sampling module is electrically connected with the modular converter, the control module respectively, for institute
The circuit information for stating modular converter output is sampled to obtain circuit information sample, and the circuit information sample is exported to described
Control module；
The control module, it is additionally operable to the circuit information sample being converted to data signal by analog signal, will changes
For data signal circuit information sample compared with preinstalled circuit information, the second comparative result is obtained, according to described second
Comparative result produces the second control signal, and second control signal is exported to the modular converter；
The modular converter, it is additionally operable to that the input voltage is adjusted according to second control signal, and according to
Voltage follower circuit information after regulation, to cause the brightness of the LED consistent with predetermined luminance.
With reference to a kind of implementation of first aspect any of the above, in the 7th kind of implementation of first aspect present invention, institute
Stating LED drive circuit also includes digital micromirror elements DMD modules, and the DMD modules are electrically connected with the control module；
The DMD modules, for the 3rd control signal exported according to the control module, adjust LED lamplight.
Optionally, the LED drive circuit also includes temperature sampling module；
The temperature sampling module includes temperature sensor and temperature monitoring circuit, the temperature monitoring circuit respectively with
The temperature sensor, the control module are electrically connected with；
The temperature sensor, for being sampled to obtain temperature samples to LED ambient temperatures；
The temperature monitoring circuit, for the temperature samples to be transferred into the control module.
Optionally, the LED drive circuit also includes radiator.
LED drive circuit provided by the invention can by gloss egf block obtain LED lamplight brightness, and by brightness by
Analog signal is converted to data signal, by the brightness of acquisition compared with predetermined luminance, according to comparative result to input voltage
It is adjusted, according to the voltage output operating voltage or operating current after regulation, so as to realize to output current or output voltage
High-precision control, therefore improve the accuracy of light modulation.Meanwhile LED drive circuit can also detect the brightness of LED lamplight,
Brightness regulation according to testing result to LED lamplight, can not be according to the brightness adjustment LED of LED with existing LED drive circuit
The brightness of light is compared, and is improved the practicality of LED, is improved Consumer's Experience.
Brief description of the drawings
Fig. 1 is a circuit diagram of LED drive circuit in the prior art；
Fig. 2 is a connection diagram of LED drive circuit in the embodiment of the present invention；
Fig. 3 is a schematic diagram of LED drive circuit in the embodiment of the present invention；
Fig. 4 is another schematic diagram of LED drive circuit in the embodiment of the present invention；
Fig. 5 is another schematic diagram of LED drive circuit in the embodiment of the present invention.
Embodiment
In order to improve regulation LED accuracy, the invention provides a kind of LED drive circuit, referring to Fig. 2, LED drives
Circuit includes：
Voltage generation module 1, gloss egf block 2, control module 3 and modular converter 4；
Voltage generation module 1, for producing input voltage；
Gloss egf block 2, for being sampled to obtain luma samples to LED lamplight, export to control module 3；
Control module 3 is electrically connected with gloss egf block 2, modular converter 4 respectively, for by luma samples by analog signal
Data signal is converted to, the luma samples of data signal is converted into compared with predetermined luminance, obtains the first comparative result,
Level controling signal is generated according to the first comparative result, level controling signal is sent to modular converter 4；
Modular converter 4 is electrically connected with control module 3, voltage generation module 1 respectively, for according to level controling signal pair
Input voltage is adjusted, and according to the voltage follower circuit information after regulation, to cause the brightness of LED and predetermined luminance one
Cause, circuit information is voltage or electric current.
Wherein, gloss egf block 2 can include luminance sensor 21 and brightness supervisory circuit 22, and brightness supervisory circuit 22 is divided
It is not connected with luminance sensor 21, control module 3.
In actual applications, LED drive circuit is electrically connected with LED, and LED drive circuit can pass through gloss egf block
2 obtain LED lamplights brightness, control module 3 by the brightness got compared with predetermined luminance, if brightness and predetermined luminance
Difference, then luminance difference is calculated, the level controling signal for adjusting output current and output voltage is generated according to luminance difference,
Input voltage caused by voltage generation module 1 is adjusted according to level controling signal for modular converter 4, with the output after regulation
Electric current and output voltage driving LED light so that the brightness of LED lamplight is consistent with predetermined luminance, therefore can be according to LED
Brightness feedback, brightness to LED carries out high-precision control.
Optionally, in some embodiments of the invention, referring to Fig. 3, voltage generation module 1 is negative supply, negative pressure
The voltage output end of power supply 1 is connected with the voltage input end of modular converter 4, and the voltage output end of modular converter 4 is positive with LED respectively
Pole, LED cathode are connected, for connecting LED.
Specifically, a preferred voltage of negative supply is -12V, it can also be other magnitudes of voltage, not limit herein specifically
It is fixed.It should be noted that the reference electrode of output module connects the shell of LED, the present invention can be online by LED drive circuit institute
Road plate contacts with the shell of LED, compared with prior art, without reserved space between wiring board and shell.
Optionally, in some embodiments of the invention, referring to Fig. 3, control module 3 includes analog-digital converter 31, showed
Field programmable logic gate array (Field Programmable Gate Array, abbreviation FPGA) 32, digital analog converter 33；
Analog-digital converter 31 respectively with gloss egf block 2, FPGA32 be electrically connected with, for by luma samples by analog signal
Be converted to data signal；
FPGA32 is electrically connected with analog-digital converter 31, digital analog converter 33 respectively, for being converted into data signal
Luma samples obtain the first comparative result compared with predetermined luminance, and the first control signal is produced according to the first comparative result；
Digital analog converter 33, for the first control signal to be converted into level controling signal.
Specifically, analog-digital converter is referred to as analog to digital (Analog to Digital, abbreviation A/D) conversion
Device, digital analog converter are referred to as digital to analogy (Digital to Analog, abbreviation D/A) converter.With prior art
In control chip compare, FPGA32 provided by the invention processing digit is more, can be to LED by the calculating to sample
The brightness of lamp carries out high-precision regulation.
Optionally, in some embodiments of the invention, referring to Fig. 3, modular converter 4 include direct current transducer 41 and
Switch module 42, the voltage input end of switch module 42 are connected with the voltage output end of voltage generation module 1, switch module 42
Voltage output end is used to connect LED；
Direct current transducer 41 is electrically connected with digital analog converter 33, switch module 42 respectively, for turning according to from digital-to-analogue
The level controling signal of parallel operation 33, generate first switch control signal；
Switch module 42, for first switch control signal of the basis from direct current transducer 41, to being generated from voltage
The input voltage of module 1 is adjusted, according to the voltage follower circuit information after regulation.
Specifically, direct current transducer 41 can be DC-to-DC (Direct Current to Direct Current,
Abbreviation DC/DC) control chip.
Switch module 42 includes the first FET (Metal Oxide Semiconductor, abbreviation MOS) 421, second
Metal-oxide-semiconductor 422, the 3rd metal-oxide-semiconductor 423, the 4th metal-oxide-semiconductor 424.The reference electrode of first metal-oxide-semiconductor 421 and the second metal-oxide-semiconductor 422 meets LED
The shell of lamp.The source electrode of 3rd metal-oxide-semiconductor 423 and the 4th metal-oxide-semiconductor connects voltage generation module 1, the first metal-oxide-semiconductor 421 and the 3rd metal-oxide-semiconductor
Grid connection direct current transducer 41, the annexation in switch module between each metal-oxide-semiconductor is similar to prior art, switch module
Specific work process see concrete application scene, here is omitted.
Optionally, in some embodiments of the invention, referring to Fig. 4, FPGA32 is additionally operable to according to the first comparative result
Generate the second control signal；
Modular converter 4 also includes pulse-width modulator 43 and LED switch 44, and LED switch 44 is changed with direct current respectively
Device 41, LED anode, LED cathode are connected；
Pulse-width modulator 43 is electrically connected with FPGA32, direct current transducer 41 respectively, for by the second control signal
Square-wave signal is converted to, is exported to direct current transducer 41；
Direct current transducer 41, it is additionally operable to generate second switch control signal according to square-wave signal, exports to LED switch 44；
LED switch 44, for according to second switch control signal on and off circuit.
Specifically, LED switch 44 can be metal-oxide-semiconductor.LED drive circuit can control according to second switch control signal
Short circuit or open circuit by LED switch 44, so as to control the output circuit by LED anode, LED cathode.The present invention can
To reach the effect of flicker by switching LED, so as to improve Consumer's Experience.
Optionally, in some embodiments of the invention, referring to Fig. 4, modular converter 4 also includes ceramic condenser 45, pottery
The two poles of the earth of porcelain electric capacity 45 are connected with LED anode, LED cathode respectively；
Ceramic condenser 45, for being filtered to the output circuit of modular converter 4.
In the present embodiment, LED drive circuit can by the switching frequency of metal-oxide-semiconductor from tens original KHz improve to
Any one frequency in [200KHz, 500KHz] frequency separation.Compared with the electrochemical capacitor employed in former LED drive circuit,
The service life of ceramic condenser is longer, therefore can increase the service life of LED drive circuit.
It is understood that modular converter can also include inductance 46, the two poles of the earth of inductance 46 respectively with switch module 42,
LED cathode connects, for adjusting the operating current in modular converter 4.
Optionally, in some embodiments of the invention, referring to Fig. 5, LED drive circuit also includes circuit information sampling
Module 5；
Circuit information sampling module 5 is electrically connected with modular converter 4, control module 3 respectively, for defeated to modular converter 4
The circuit information gone out is sampled to obtain circuit information sample, and circuit information sample is exported to control module 3；
Control module 3, it is additionally operable to circuit information sample being converted to data signal by analog signal, is converted into digital letter
Number circuit information sample compared with preinstalled circuit information, obtain the second comparative result, according to the second comparative result produce
Second control signal, the second control signal is exported to modular converter；
Modular converter 4, it is additionally operable to that input voltage is adjusted according to the second control signal, and according to the voltage after regulation
Output circuit information, to cause the brightness of LED consistent with predetermined luminance.
Specifically, circuit information sampling module 5 includes current sampling circuit 51, current monitoring circuit 52 and/or voltage prison
Circuit 53 is controlled, the current output terminal with inductance 46, LED cathode are connected respectively at the two poles of the earth of current sampling circuit 51, current monitoring electricity
The current output terminal on road 52 is connected with the current input terminal of A/D converter 31, and voltage monitoring circuit 52 and A/D converter 31 are electrical
Connection.
Circuit information sampling module 5 gather current sample, control module 3 by current sample compared with predetermined current,
If current sample is less than predetermined current, generation improves the level controling signal of power output, by direct current transducer 41 by electricity
Flat control signal is converted to switch controlling signal, and the first metal-oxide-semiconductor 421 and the in switch module 42 is improved using switch controlling signal
The dutycycle of two metal-oxide-semiconductors 422, and the dutycycle of the 3rd metal-oxide-semiconductor 423 and the 4th metal-oxide-semiconductor 424 is reduced, so as to improve power output,
To cause the brightness of LED consistent with predetermined luminance.If current sample is higher than predetermined current, generation reduces the electricity of power output
Flat control signal, switch controlling signal is converted to by direct current transducer 41, reduces the first metal-oxide-semiconductor 421 and the second metal-oxide-semiconductor 422
Dutycycle, and the dutycycle of the 3rd metal-oxide-semiconductor 423 and the 4th metal-oxide-semiconductor 424 is improved, so as to reduce power output, to cause LED
The brightness of lamp is consistent with predetermined luminance.
LED drive circuit collection voltages sample, the detailed process that the brightness of LED is adjusted by voltage sample are led to above-mentioned
The process of the brightness of overcurrent sample regulation LED is similar, and here is omitted.
It should be noted that current information sampling module 51 includes precision resister, therefore the circuit of output can be believed
Breath carries out sampling with high precision.
It is understood that the control module of LED drive circuit, which can be combined with the first comparative result and second, compares knot
Fruit, the circuit information of output is adjusted by modular converter, detailed process see above example, no longer superfluous herein
State.
Optionally, in some embodiments of the invention, referring to Fig. 5, LED drive circuit also includes digital micromirror elements
(Digital Micro mirror Device, abbreviation DMD) module 6, DMD modules 6 are electrically connected with control module 3；
DMD modules 6, for the 3rd control signal exported according to control module 3, adjust LED lamplight.
Specifically, DMD modules can be imitated by adjusting the angle of itself micro mirror with adjusting the angle of LED lamplight and display
Fruit, therefore improve Consumer's Experience.
Optionally, in some embodiments of the invention, referring to Fig. 5, LED drive circuit also includes temperature sampling module
7, temperature sampling module 7 includes temperature sensor 71 and temperature monitoring circuit 72, and temperature monitoring circuit 72 passes with temperature respectively
Sensor 71, control module 3 are electrically connected with；
Temperature sensor 71, for being sampled to obtain temperature samples to the temperature of LED；
Temperature monitoring circuit 72, for temperature samples to be transferred into control module 3.
In the present embodiment, LED drive circuit can monitor LED by temperature sensor 71 and temperature monitoring circuit 72
Temperature, when the temperature for detecting LED meets or exceeds excess temperature critical value, FPGA32 is sent to DC/DC control chips 41
For the control instruction of closing switch module 42, output current is cut off, so as to realize overheat protector function.
Optionally, in some embodiments of the invention, LED drive circuit also includes radiator.
In the prior art, the anode of power supply is connected with LED anode, if radiator and accommodating LED drive circuit
Housing contacts, and electric leakage or short circuit phenomenon easily occurs, potential safety hazard be present.In the present embodiment, due to the power supply of LED drive circuit
For negative supply, the positive pole of LED drive circuit connects the shell of LED, therefore radiator can be with the housing phase of LED drive circuit
Even, so as to add the area of dissipation of radiator, the radiating efficiency of radiator can be improved.
For ease of understand, below with a concrete application scene to each module in LED drive circuit provided by the invention it
Between interaction describe in detail：
Luminance sensor 21 detects the brightness of LED lamplight, brightness supervisory circuit 22 by luminance transmission to D/A converter 31,
Brightness is converted to data signal by D/A converter 31 by analog signal, is exported to FPGA32, and FPGA32 is by brightness and predetermined luminance
It is compared, when brightness is less than predetermined luminance, shows that power output is too low, FPGA32 calculates luminance difference, according to luminance difference
Value determines to be used for the control signal S1 for heightening output current and output voltage, S1 is exported to D/A converter 33, D/A converter
S1 is converted to level controling signal S2 by 33, is exported to DC/DC control chips 41；
DC/DC control chips 41 generate switch controlling signal S3 according to S2, and metal-oxide-semiconductor 421 and metal-oxide-semiconductor 422 are improved using S3
Dutycycle, and reduce the dutycycle of metal-oxide-semiconductor 423 and metal-oxide-semiconductor 424, so as to improve the operating power of LED, therefore can carry
The brightness of high LED, it is allowed to consistent with predetermined luminance；
When brightness is higher than predetermined luminance, show that power output is too high, FPGA32 calculates luminance difference, according to luminance difference
It is determined that the control signal S4 for turning down output current and output voltage, S4 is exported to D/A converter 33, D/A converter 33
S4 is converted into level controling signal S5, exported to DC/DC control chips 41；
DC/DC control chips 41 generate switch controlling signal S6 according to S5, and metal-oxide-semiconductor 421 and metal-oxide-semiconductor 422 are reduced using S6
Dutycycle, and improve the dutycycle of metal-oxide-semiconductor 423 and metal-oxide-semiconductor 424, so as to reduce the operating power of LED, therefore can drop
The brightness of low LED, it is allowed to consistent with predetermined luminance；When LED lamplight is dimmed or brightens, LED drive circuit can maintain LED
The brightness of light can be consistent with predetermined luminance, it is achieved thereby that automatic regulation function.Brightness is adopted by FPGA simultaneously
Sample is calculated, then the frequency of switch module is accurately controlled by DC/DC control chips, improves the accurate of light modulation
Degree.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
The unit illustrated as separating component can be or may not be physically separate, show as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
Described above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
- A kind of 1. LED drive circuit, it is characterised in that including：Voltage generation module, gloss egf block, control module and modular converter；The voltage generation module, for producing input voltage；The gloss egf block, for being sampled to obtain luma samples to LED lamplight；The control module is electrically connected with the gloss egf block, the modular converter respectively, for by the luma samples Data signal is converted to by analog signal, is converted into the luma samples of data signal compared with predetermined luminance, obtains One comparative result, level controling signal is generated according to first comparative result；The modular converter is electrically connected with the control module, the voltage generation module respectively, for according to the level The input voltage is adjusted control signal, according to the voltage follower circuit information after regulation, to cause the LED Brightness is consistent with predetermined luminance, and the circuit information is voltage or electric current；The voltage generation module is negative supply, and the voltage of the voltage output end of the negative supply and the modular converter is defeated Enter end to be connected, the voltage output end of the modular converter is used to connect LED；The control module includes analog-digital converter, field programmable gate array FPGA, digital analog converter；The analog-digital converter respectively with the gloss egf block, the FPGA be electrically connected with, for by the luma samples by Analog signal is converted to data signal；The FPGA is electrically connected with the analog-digital converter, the digital analog converter respectively, for being converted into data signal Luma samples compared with predetermined luminance, obtain the first comparative result, according to first comparative result produce first control Signal processed；The digital analog converter, for first control signal to be converted into level controling signal；The modular converter includes direct current transducer and switch module, the voltage input end of the switch module and the voltage The voltage output end of generation module is connected, and the voltage output end of the switch module is used to connect LED；The direct current transducer is electrically connected with the digital analog converter, the switch module respectively, for according to the level Control signal, generate first switch control signal；The switch module, for according to the first switch control signal, the input voltage being adjusted, according to regulation Voltage follower circuit information afterwards.
- 2. LED drive circuit according to claim 1, it is characterised in that the FPGA is additionally operable to according to the described first ratio Relatively result generates the second control signal；The modular converter also includes pulse-width modulator and LED switch；The pulse-width modulator is electrically connected with the FPGA, the direct current transducer respectively, for described second to be controlled Signal processed is converted to square-wave signal；The direct current transducer, it is additionally operable to generate second switch control signal according to the square-wave signal；The LED switch is connected with direct current transducer, LED anode, LED cathode respectively, for being controlled according to the second switch Signal conduction closes circuit.
- 3. LED drive circuit according to claim 1, it is characterised in that the modular converter also includes ceramic condenser, institute The two poles of the earth for stating ceramic condenser are connected with LED anode, LED cathode respectively；The ceramic condenser, for being filtered to the output circuit of the modular converter.
- 4. LED drive circuit according to any one of claim 1 to 3, it is characterised in that the LED drive circuit is also Including circuit information sampling module；The circuit information sampling module is electrically connected with the modular converter, the control module respectively, for described turn The circuit information of mold changing block output is sampled to obtain circuit information sample, and the circuit information sample is exported to the control Module；The control module, it is additionally operable to the circuit information sample being converted to data signal by analog signal, is converted into counting The circuit information sample of word signal obtains the second comparative result compared with preinstalled circuit information, compares according to described second As a result the second control signal is produced, second control signal is exported to the modular converter；The modular converter, it is additionally operable to that the input voltage is adjusted according to second control signal, and according to regulation Voltage follower circuit information afterwards, to cause the brightness of the LED consistent with predetermined luminance.
- 5. LED drive circuit according to any one of claim 1 to 3, it is characterised in that the LED drive circuit is also Including digital micromirror elements DMD modules, the DMD modules are electrically connected with the control module；The DMD modules, for the 3rd control signal exported according to the control module, adjust LED lamplight.
- 6. LED drive circuit according to any one of claim 1 to 3, it is characterised in that the LED drive circuit is also Including temperature sampling module；The temperature sampling module includes temperature sensor and temperature monitoring circuit, the temperature monitoring circuit respectively with it is described Temperature sensor, the control module are electrically connected with；The temperature sensor, for being sampled to obtain temperature samples to the temperature of LED；The temperature monitoring circuit, for the temperature samples to be transferred into the control module.
- 7. LED drive circuit according to any one of claim 1 to 3, it is characterised in that the LED drive circuit is also Including radiator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511025378.8A CN105682283B (en) | 2015-12-29 | 2015-12-29 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511025378.8A CN105682283B (en) | 2015-12-29 | 2015-12-29 | A kind of LED drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105682283A CN105682283A (en) | 2016-06-15 |
| CN105682283B true CN105682283B (en) | 2018-01-23 |
Family
ID=56298244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511025378.8A Active CN105682283B (en) | 2015-12-29 | 2015-12-29 | A kind of LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105682283B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793288A (en) * | 2016-12-15 | 2017-05-31 | 广东威创视讯科技股份有限公司 | Led drive circuit |
| CN106707590A (en) * | 2017-02-27 | 2017-05-24 | 深圳市华星光电技术有限公司 | Display panel over-temperature protection system and display panel over-temperature protection method |
| CN109600885B (en) * | 2019-01-11 | 2020-10-23 | 威创集团股份有限公司 | Large-current redundancy driving device |
| CN110913535B (en) * | 2019-12-12 | 2021-09-17 | 歌尔股份有限公司 | Control parameter adjusting method and device, and detection method and device of LED lamp |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101350168A (en) * | 2007-07-16 | 2009-01-21 | 精碟科技股份有限公司 | Light source drive die set for digital light source processing apparatus |
| CN201773565U (en) * | 2010-08-05 | 2011-03-23 | 中航华东光电有限公司 | Special type backlight source driving circuit with MOS tube driving circuit |
| CN102404915A (en) * | 2010-09-09 | 2012-04-04 | 半导体解法株式会社 | Light generating device and method for controlling the device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8021021B2 (en) * | 2008-06-26 | 2011-09-20 | Telelumen, LLC | Authoring, recording, and replication of lighting |
-
2015
- 2015-12-29 CN CN201511025378.8A patent/CN105682283B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101350168A (en) * | 2007-07-16 | 2009-01-21 | 精碟科技股份有限公司 | Light source drive die set for digital light source processing apparatus |
| CN201773565U (en) * | 2010-08-05 | 2011-03-23 | 中航华东光电有限公司 | Special type backlight source driving circuit with MOS tube driving circuit |
| CN102404915A (en) * | 2010-09-09 | 2012-04-04 | 半导体解法株式会社 | Light generating device and method for controlling the device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105682283A (en) | 2016-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105682283B (en) | A kind of LED drive circuit | |
| CN205830106U (en) | A kind of constant-current LED driving chip | |
| CN104053283A (en) | LED dimming control circuit | |
| CN103079322B (en) | Closed loop light-emitting diode (LED) current control circuit and power-switching circuit | |
| CN102270885B (en) | Method and arrangement for balancing voltages of series connection of storage units for electrical energy | |
| CN205124062U (en) | Starting circuit , LED driver and LED drive circuit of chip | |
| CN202512160U (en) | Driving circuit for light emitting diode device and voltage detection device thereof | |
| CN1856205B (en) | Improved control system for fluorescent light fixture | |
| CN205726501U (en) | A kind of LED adjusting control circuit | |
| CN103796387A (en) | LED drive device, battery charger and drive control circuit of LED drive device | |
| CN105407582A (en) | LED drive circuit and LED circuit | |
| US9741503B2 (en) | Control circuit of switch device | |
| EP3641501B1 (en) | Led driving circuit and led apparatus | |
| CN108322020A (en) | A kind of liter of voltage protection circuit and its control method | |
| CN210609794U (en) | Commercial power direct drive type LED microwave induction lamp | |
| CN106961212B (en) | A kind of voltage conversion device and its control method | |
| CN104540296A (en) | Compatible LED intelligent fluorescent lamp tube and control method thereof | |
| CN113489320B (en) | Power supply circuit, power supply device, and lighting device | |
| CN202564974U (en) | Battery equalizing circuit | |
| CN211352049U (en) | High-transformation-ratio DC/DC conversion circuit | |
| CN202759380U (en) | Power supply circuit, LED backlight driving power supply and television set | |
| CN209265386U (en) | Power supply starting circuit, circuit board and power supply equipment | |
| JP6775290B2 (en) | Two-terminal constant current controller | |
| Mangkalajan et al. | Design of Approximate 2DOF Digital Control for Widely Dimming LCL-T Resonant LED Driver | |
| JP2018050436A (en) | Power supply unit and power supply control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No. 233 Kezhu Road, High tech Industrial Development Zone, Huangpu District, Guangzhou City, Guangdong Province, 510670 Patentee after: VTRON GROUP Co.,Ltd. Country or region after: China Address before: 233 Kezhu Road, Guangzhou hi tech Industrial Development Zone, Guangdong 510670 Patentee before: VTRON TECHNOLOGIES Ltd. Country or region before: China |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240508 Address after: 401431 Building 1, No. 57 Jinfu Avenue, Gunan Street, Qijiang District, Chongqing (self committed) Patentee after: Chongqing XinShiTong Intelligent Technology Co.,Ltd. Country or region after: China Address before: No. 233 Kezhu Road, High tech Industrial Development Zone, Huangpu District, Guangzhou City, Guangdong Province, 510670 Patentee before: VTRON GROUP Co.,Ltd. Country or region before: China |