CN105072757B - Driving chip, constant current driver circuit for LED and its control method - Google Patents
Driving chip, constant current driver circuit for LED and its control method Download PDFInfo
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- CN105072757B CN105072757B CN201510484257.3A CN201510484257A CN105072757B CN 105072757 B CN105072757 B CN 105072757B CN 201510484257 A CN201510484257 A CN 201510484257A CN 105072757 B CN105072757 B CN 105072757B
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Abstract
The present invention relates to LED light control technology fields, and the present invention provides a kind of driving chip, constant current driver circuit for LED and its control method, including multiple drive modules；Each drive module is divided to obtain operating voltage by the voltage to input power, and output voltage gives next drive module connected to it, and it is shown according to the LED light that its corresponding grade display data controls it internal, make to flow through the constant current hold of LED light during unlatching LED light, and keep the difference between the voltage of power input and the voltage of power output end constant when LED light opens and closes, by the way that drive module is cascaded, when control source, input voltage is assigned in each drive module, it can realize the input of different range voltage, reduce the attenuation of input voltage simultaneously.
Description
Technical field
The present invention relates to LED light control technology field more particularly to a kind of driving chip, constant current driver circuit for LED and its
Control method.
Background technology
At present, it is following related to environment protecting and power-saving as world community government reaches common understanding on energy-saving and environment friendly
Industrial prospect development potentiality it is huge, possessing the LED semiconductor technologies of popular industry will be as most there is the high-new skill of development potentiality
One of art field.The development of semiconductor technology and industry is more much faster than people's expection, and certain characteristics of LED light source are previous any
Artificial light sources is incomparable, such as it is rich in color, color saturation is high, light beam concentration, solid luminescent, fast response time, brightness and
Color can digitize, intelligent and control based on network is with adjusting etc..
In LED Landscape Lightings field, line lamp, soft light bar, the guardrail pipe formed using light emitting diode etc. is had reliable
Property height, service life length, strong environmental adaptability, cost performance it is high and the features such as use cost is low, in recent years,
The main product of building decoration, shop decoration is rapidly become.
With the development of LED actuation techniques, the requirement to LED Landscape Lightings is higher and higher, occurs high-pressure series in the market
The chip of application, but it uses constant voltage mode, and voltage fluctuation can cause the variation of LED light electric current.Existing constant-current LED circuit system
System, in a kind of LED drive circuit system, as shown in Figure 1, reducing the input voltage of chip, LED series connection by the series connection of LED
The defects of number determines by input voltage VIN, and data DATA shows duty ratio by chip DIN port controllings LED, the program be
The display duty ratio of each LED light can not individually be controlled；In another LED drive circuit system, as shown in Fig. 2, passing through
DATA controls the display of each LED, but is that can not realize different power input voltages, and the program the defects of program
Middle voltage attenuation is larger.In conclusion different power input voltages can not be realized by existing in the prior art in LED drive circuit
And voltage attenuation it is larger the problem of.
Invention content
The purpose of the present invention is to provide a kind of driving chip, constant current driver circuit for LED and its control methods, it is intended to solve
Different power input voltages can not be realized in LED drive circuit and voltage attenuation is larger asks for existing in the prior art
Topic.
The invention is realized in this way first aspect present invention provides a kind of constant current driver circuit for LED, the LED constant current
Driving circuit includes multiple drive modules, and the quantity of multiple drive modules is n, and n is the positive integer more than 1, and the 1st drives
The power input connection input power of module, the data input pin of the 1st drive module receive data frame；
The power output end of 1st drive module connects the power input of the 2nd drive module, described 1st
The data output end of drive module connects the data input pin of the 2nd drive module, and from the 2nd drive module successively according to by
Grade series system is connected to n-th of drive module；
Each drive module is divided to obtain operating voltage the voltage of input power by way of series connection, and defeated
Go out voltage to next drive module connected to it；
1st drive module obtains this grade of display data, and sends data frame to the 2nd drive module；
2nd drive module according to data frame input voltage to the data frame that the 1st drive module exports into
Line level conversion extracts its corresponding grade from the identifiable data frame and shows number to obtain identifiable data frame
According to, and send data frame and performed successively to n-th of drive module to the 3rd drive module, and thus in accordance with series system step by step；
Each drive module is shown according to the LED light that its corresponding grade display data controls it internal, is made
The constant current hold of the LED light is flowed through when opening the LED light, and power supply is kept when the LED light opens and closes
Difference between the voltage of input terminal and the voltage of power output end is constant.
With reference to first aspect, as the first embodiment of first aspect, the drive module includes LED light and driving
Chip；
The anode of the LED light connect the power input of the driving chip and form the drive module power supply it is defeated
Enter end, the cathode of the LED light connects the control signal output of the driving chip, and the ground terminal of the driving chip is institute
State the power output end of drive module, the data input pin of the driving chip is the data input pin of the drive module, institute
The data output end for stating driving chip is the data output end of the drive module；
This grade display data of the driving chip according to corresponding to it controls LED light connected to it to be shown, makes
The constant current hold of the LED light is flowed through when opening the LED light, and power supply is kept when the LED light opens and closes
Difference between the voltage of input terminal and the voltage of power output end is constant.
With reference to first aspect, as second of embodiment of first aspect, the driving chip includes constant current and drives mould
Block and decoder module；
The input terminal of the decoder module is the data input pin of the driving chip, and the first of the decoder module exports
The data output end for the driving chip is held, the second output terminal of the decoder module connects the control of the constant-current driven module
End processed；
The decoder module extracts its corresponding grade display data from the data frame, and sends data frame and be sent to
Next drive module, and described grade display data is decoded, decoded display data is sent to the constant current drives
Dynamic model block；
The constant-current driven module controls LED light connected to it to be shown according to the decoded display data,
Make to flow through the constant current hold of the LED light during unlatching LED light.
With reference to first aspect, as the third embodiment of first aspect, the driving chip includes Voltage stabilizing module, institute
The input terminal for stating Voltage stabilizing module is the power input of the driving chip, and the output terminal of the Voltage stabilizing module is the driving core
The power output end of piece；
The Voltage stabilizing module is for the voltage of holding power input when the LED light opens and closes and power supply output
Difference between the voltage at end is constant
Second of embodiment with reference to first aspect, as the 4th kind of embodiment of first aspect, the decoding mould
Block includes signal sampling module, PWM scan modules and shaping regeneration module；
The signal sampling module is used for gathered data frame, and it is recognizable to obtain to carry out level conversion to the data frame
Data frame；
The PWM scan modules are used to extract this grade of display data from the identifiable data frame and be decoded,
Decoded display data is sent to the constant-current driven module, and sends the data frame to the shaping regeneration module；
The shaping regeneration module is used to be sent to next drive module after carrying out shaping to the data frame.
The third embodiment with reference to first aspect, as the 5th kind of embodiment of first aspect, the decoding mould
Block includes signal sampling module, internal control/external control judgment module, PWM scan modules and shaping regeneration module；
The signal sampling module is used for gathered data frame, and it is recognizable to obtain to carry out level conversion to the data frame
Data frame；
The internal control/external control judgment module is for judging whether to receive data frame, when judging result is to be, from reception
To data frame in extract its corresponding grade display data and be sent to the PWM scan modules, when judging result is no,
According to this grade of display data of data acquisition of built-in effect algorithm offer and it is sent to the PWM scan modules；
The PWM scan modules are used to extract this grade of display data from the identifiable data frame and be decoded,
Decoded display data is sent to the constant-current driven module, and sends the data frame to the shaping regeneration module；
The shaping regeneration module is used to be sent to next drive module after carrying out shaping to the data frame.
The 4th kind of embodiment with reference to first aspect, as the 6th kind of embodiment of first aspect, the decoding mould
Block further includes the first signal transmssion line and second signal transmission line；
The decoder module obtains differential data frame according to first signal transmssion line and the second signal transmission line,
And its corresponding grade display data is extracted from the differential data frame, it is encoded into difference number by what remaining display data formed
Next drive module is sent to according to frame.
Second aspect of the present invention provides a kind of control method of constant current driver circuit for LED, the constant current driver circuit for LED packet
Multiple drive modules are included, the quantity of multiple drive modules is n, and n is positive integer, the power input of the 1st drive module
Input power is connected, the data input pin of the 1st drive module receives data frame；
The control method includes the following steps：
Each drive module is divided by the voltage to input power to obtain operating voltage, and output voltage gives
Its next drive module connected；
1st drive module obtains this grade of display data, and sends data frame to the 2nd drive module；
2nd drive module is according to input voltage to the data frame that the 1st drive module exports into line level
It converts to obtain identifiable data frame, and extract its corresponding grade display data from the identifiable data frame, and
Transmission data frame gives the 3rd drive module, and is performed successively to n-th of drive module thus in accordance with series system step by step；
Each drive module is shown according to the LED light that its corresponding grade display data controls it internal, is made
The constant current hold of the LED light is flowed through when opening the LED light, and power supply is kept when the LED light opens and closes
Difference between the voltage of input terminal and the voltage of power output end is constant.
With reference to second aspect, as the first embodiment of second aspect, the 1st drive module obtains this grade and shows
Registration according to the step of be specially：
A. the 1st drive module judges whether to receive data frame, is then to perform step B, no, then performs step
C；
B. its corresponding grade display data is extracted from the data frame received；
C. this grade of display data of data acquisition provided according to built-in effect algorithm.
Third aspect present invention provides a kind of driving chip, and the driving chip is connected in series with multiple driving chips, institute
It states driving chip power input and connects upper driving chip power output end, the driving chip power output end connection is next
The power input of driving chip, the data input pin of the driving chip connects upper driving chip data output end, described
The data output end of driving chip connects the data input pin of next driving chip, the current output terminal connection of the driving chip
LED light；
The driving chip is divided to obtain by way of connecting with remaining driving chip to the voltage of input power
Operating voltage is taken, and output voltage gives next driving chip connected to it；
The driving chip carries out level conversion to obtain identifiable data according to data frame input voltage to data frame
Frame, and its corresponding grade display data is extracted from the identifiable data frame, and send data frame to next driving
Chip；
The driving chip controls corresponding LED light to be shown according to its corresponding grade display data, makes out
The constant current hold of the LED light is flowed through when opening the LED light, and keeps power supply defeated when the LED light opens and closes
The difference entered between the voltage at end and the voltage of power output end is constant.
With reference to the third aspect, as the first embodiment of the third aspect, the driving chip includes constant current and drives mould
Block and decoder module；
The input terminal of the decoder module is the data input pin of the driving chip, and the first of the decoder module exports
The data output end for the driving chip is held, the second output terminal of the decoder module connects the control of the constant-current driven module
End processed；
The decoder module extracts its corresponding grade display data from the data frame, and sends data frame to next
Drive module, and described grade display data is decoded, decoded display data is sent to the constant current drives mould
Block；
The constant-current driven module controls LED light connected to it to be shown according to the decoded display data,
Make to flow through the constant current hold of the LED light during unlatching LED light.
With reference to the third aspect, as second of embodiment of the third aspect, the driving chip includes Voltage stabilizing module, institute
The input terminal for stating Voltage stabilizing module is the power input of the driving chip, and the output terminal of the Voltage stabilizing module is the driving core
The power output end of piece；
The Voltage stabilizing module is for the voltage of holding power input when the LED light opens and closes and power supply output
Difference between the voltage at end is constant.
With reference to the third aspect, as the third embodiment of the third aspect, the decoder module includes signal sampling mould
Block, PWM scan modules and shaping regeneration module；
The signal sampling module is used for gathered data frame, and it is recognizable to obtain to carry out level conversion to the data frame
Data frame；
The PWM scan modules are used to extract this grade of display data from the identifiable data frame and be decoded,
Decoded display data is sent to the constant-current driven module, and sends the data frame to the shaping regeneration module；
The shaping regeneration module is used to be sent to next drive module after carrying out shaping to the data frame.
With reference to the third aspect, as the 4th kind of embodiment of the third aspect, the decoder module includes signal sampling mould
Block, internal control/external control judgment module, PWM scan modules and shaping regeneration module；
The signal sampling module is used for gathered data frame, and it is recognizable to obtain to carry out level conversion to the data frame
Data frame；
The internal control/external control judgment module is for judging whether to receive data frame, when judging result is to be, from reception
To data frame in extract its corresponding grade display data and be sent to the PWM scan modules, when judging result is no,
According to this grade of display data of data acquisition of built-in effect algorithm offer and it is sent to the PWM scan modules；
The PWM scan modules are used to extract this grade of display data from the identifiable data frame and be decoded,
Decoded display data is sent to the constant-current driven module, and sends the data frame to the shaping regeneration module；
The shaping regeneration module is used to be sent to next drive module after carrying out shaping to the data frame.
The present invention provides a kind of driving chip, constant current driver circuit for LED and its control method, by the way that drive module is connected
Together, when control source, input voltage is assigned in each drive module, can realize the defeated of different range voltage
Enter, while reduce the attenuation of input voltage, provide the reliability of system, and overall structure is simple, reduce product
Cost.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the structure diagram of constant current driver circuit for LED in the prior art；
Fig. 2 is the structure diagram of another constant current driver circuit for LED in the prior art；
Fig. 3 is a kind of structure diagram of constant current driver circuit for LED provided by the invention；
Fig. 4 is that the structure of the driving chip in the drive module in a kind of constant current driver circuit for LED provided by the invention is shown
It is intended to；
Fig. 5 is the another kind of the driving chip in the drive module in a kind of constant current driver circuit for LED provided by the invention
Example structure schematic diagram；
Fig. 6 is a kind of control method flow chart of constant current driver circuit for LED provided by the invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In order to illustrate technical scheme of the present invention, illustrated below by specific embodiment.
The present invention provides a kind of constant current driver circuit for LED, as shown in figure 3, constant current driver circuit for LED includes multiple driving moulds
Block (1,2 to N), the quantity of multiple drive modules are n, and n is the positive integer more than 1, the power input of the 1st drive module 1
Input power is connected, the data input pin of the 1st drive module 1 receives data frame.
The power output end of 1st drive module 1 connects the power input of the 2nd drive module 2, the 1st driving mould
The data output end of block 1 connects the data input pin of the 2nd drive module 2, and from the 2nd drive module 2 successively according to step by step
Series system is connected to n-th of drive module N.
Each drive module is divided to obtain operating voltage the voltage of input power by way of series connection, and defeated
Go out voltage to next drive module connected to it.
1st drive module 1 obtains this grade of display data, and send data frame to the 2nd drive module 2.
2nd drive module 2 turns the data frame that the 1st drive module exports into line level according to data frame input voltage
It changes to obtain identifiable data frame, and its corresponding grade display data is extracted from identifiable data frame, and send number
According to frame to the 3rd drive module, and performed successively to n-th of drive module N thus in accordance with series system step by step；
Each drive module is shown according to the LED light that its corresponding grade display data controls it internal, makes unlatching
The constant current hold of LED light is flowed through during LED light, and the voltage and electricity of power input are kept when LED light opens and closes
Difference between the voltage of source output terminal is constant.
A kind of constant current driver circuit for LED of the present invention,, will be defeated when control source by the way that drive module is cascaded
Enter voltage to be assigned in each drive module, can realize the input of different range voltage, while reduce input voltage
Attenuation provides the reliability of system, and overall structure is simple, reduces the cost of product.
Specifically, drive module includes LED light and driving chip, the power input of the anode connection driving chip of LED light
Hold and form the power input of drive module, the control signal output of the cathode connection driving chip of LED light, driving chip
Ground terminal be drive module power output end, the data input pin of driving chip is the data input pin of drive module, is driven
The data output end of dynamic chip is the data output end of drive module.
This grade display data of the driving chip according to corresponding to it controls LED light connected to it to be shown, makes unlatching
The constant current hold of LED light is flowed through during LED light, and the voltage and electricity of power input are kept when LED light opens and closes
Difference between the voltage of source output terminal is constant.
Specifically, as shown in figure 4, driving chip includes constant-current driven module 20 and decoder module 30；
The input terminal of decoder module 30 is the data input pin of driving chip, and the first output terminal of decoder module 30 is driving
The data output end of chip, the control terminal of the second output terminal connection constant-current driven module 20 of decoder module 30.
Decoder module 30 extracts its corresponding grade display data from data frame, and sends data frame to next driving mould
Block, and this grade of display data is decoded, decoded display data is sent to constant-current driven module 20.
Constant-current driven module 20 controls LED light connected to it to be shown according to decoded display data, make unlatching
The constant current hold of the LED light is flowed through during the LED light.
Wherein, in a kind of embodiment, the driving chip in the 1st drive module receives DATA signal, passes through built-in solution
Code module 30, intercepts first data, and remaining data is sent by DO ports, the rest may be inferred for other chips.It is another
In kind of embodiment, the driving chip in the 1st drive module receives DATA signal, by built-in decoder module 30, interception the
One data, and total data is sent by DO ports, the rest may be inferred for other driving chips.
Decoder module 30 is decoded data, is converted into the control signal that OUT terminal mouth control LED is opened and closed, and
Constant-current driven module 20 is sent to, when OUT terminal mouth is opened, electric current is made not changed by the change of voltage.
Further, driving chip further includes Voltage stabilizing module 10, and the input terminal of Voltage stabilizing module 10 is the power supply of driving chip
Input terminal, the output terminal of Voltage stabilizing module 10 are the power output end of driving chip.
Voltage stabilizing module 10 is for the electricity of the voltage of holding power input and power output end when LED light opens and closes
Difference between pressure is constant.
Preferably, by calculating the number of driving chip, Voltage stabilizing module 10 can be realized and be evenly distributed to input voltage
On each driving chip.
Specifically, a kind of embodiment as decoder module 30, decoder module 30 includes signal sampling module 301, PWM
Scan module 303 and shaping regeneration module 304.
Signal sampling module 301 is used for gathered data frame, and carries out level conversion to data frame to obtain identifiable number
According to frame.
Specifically, since each driving chip divides input voltage, lead to the defeated of each driving chip
Enter level to differ, therefore, what next driving chip needs exported a upper driving chip according to incoming level itself
Data frame carries out level conversion so that driving chip can identify received data frame.
PWM scan modules 303 will decode for extracting this grade of display data from identifiable data frame and being decoded
Display data afterwards is sent to constant-current driven module 20, and sends data frame to the shaping regeneration module 304.
Shaping regeneration module 304 is used to be sent to next drive module after carrying out shaping to data frame.
Specifically, the another embodiment as decoder module 30, decoder module 30 include signal sampling module 301,
Internal control/external control judgment module 302, PWM scan modules 303 and shaping regeneration module 304.
Signal sampling module 301 is used for gathered data frame, and carries out level conversion to data frame to obtain identifiable number
According to frame.
Specifically, since each driving chip divides input voltage, lead to the defeated of each driving chip
Enter level to differ, therefore, what next driving chip needs exported a upper driving chip according to incoming level itself
Data frame carries out level conversion so that driving chip can identify received data frame.
Internal control/external control judgment module 302 is for judging whether to receive data frame, when judging result is to be, from reception
To data frame in extract its corresponding grade display data and be sent to PWM scan modules 303, when judging result is no,
According to this grade of display data of data acquisition of built-in effect algorithm offer and it is sent to PWM scan modules 303；
PWM scan modules 303 will decode for extracting this grade of display data from identifiable data frame and being decoded
Display data afterwards is sent to constant-current driven module, and sends data frame to shaping regeneration module 304.
Shaping regeneration module 304 is used to be sent to next drive module after carrying out shaping to data frame.
Further, as shown in figure 5, as another embodiment, decoder module 30 include the first signal transmssion line and
Second signal transmission line；
Decoder module 30 obtains differential data frame according to the first signal transmssion line and second signal transmission line, and from difference number
According to extracting its corresponding grade display data in frame, by remaining display data form be encoded into differential data frame be sent to it is next
Drive module.
Specifically, the first signal transmssion line and the opposite data-signal of second signal transmission line incoming level signal, decoding
Module is compared to obtain data frame to two data-signals, its corresponding grade display data is extracted, by remaining display data
The differential data frame that is encoded into of composition is sent to next drive module.
Another kind embodiment of the invention provides a kind of control method of constant current driver circuit for LED, as shown in fig. 6, LED constant current
Driving circuit includes multiple drive modules, and the quantity of multiple drive modules is n, and n is positive integer, the power supply of the 1st drive module 1
Input terminal connects input power, and the data input pin of the 1st drive module 1 receives data frame.
Control method includes the following steps：
The each drive modules of step S101. are divided by the voltage to input power to obtain operating voltage, and defeated
Go out voltage to next drive module connected to it.
The 1st drive module of step S102. obtains this grade of display data, and sends data frame to the 2nd drive module.
The 2nd drive module of step S103. is according to input voltage to the data frame that the 1st drive module exports into line level
It converts to obtain identifiable data frame, and extract its corresponding grade display data from identifiable data frame, and send
Data frame gives the 3rd drive module, and is performed successively to n-th of drive module thus in accordance with series system step by step.
The each drive modules of step S104. are shown according to the LED light that its corresponding grade display data controls it internal
Show, make to flow through the constant current hold of LED light during unlatching LED light, and power input is kept when LED light opens and closes
Difference between voltage and the voltage of power output end is constant.
Specifically, in step s 102, the step of the 1st drive module 1 obtains this grade of display data, is specially：
The 1st drive module 1 of step S1031. judge whether to receive data frame, is then to perform step S1032, no, then
Perform step S1033.
Step S1032. extracts its corresponding grade display data from the data frame received.
This grade of display data of data acquisition that step S1033. is provided according to built-in effect algorithm.
Specifically, the driving chip in drive module in LED drive circuit judges this chip operation in peripheral control unit
State of a control or built-in automatic display effect state, wherein, when driving chip input port DIN is received in a period of time
During data, judgement is in peripheral control unit state of a control, and when being not received by data, judgement is in built-in automatic display effect shape
State.
If driving chip is operated in peripheral control unit state, the data frame that driving chip interception peripheral control unit provides
The data of middle this driving chip of correspondence, and forward remaining data frame；If driving chip is operated in built-in automatic display effect
Fruit state, the then data that driving chip is provided according to built-in effect algorithm extract data, and effect algorithm data built in providing to
Next chips.
Driving chip controls LED connected to it to be shown according to the data of interception, reaches the display effect of needs.
For the ease of understanding the present invention, for example implementation method of the bright invention：
As shown in figure 3, input voltage VIN is 300V, 60 driving chips are concatenated altogether, when driving chip OUT terminal mouth is opened
Electric current is 12mA, and when the system is stable, the difference between each driving chip vdd terminal mouth voltage and GND port voltages is about 300/
60=5V.By taking first driving chip as an example：Chip DIN ports receive DATA data, intercept first data, and remainder
It is sent according to by DO ports.Assuming that first data is 50% duty cycle signals, then after reset signals are received, the
One driving chip OUT terminal mouth is opened and closed with certain frequency, 50% duty ratio, until next data and reset signals
Arrival.
Specifically, it is specially in step S1032：
Data frame is received using differential transfer mode.
Wherein, it is right using the opposite data-signal of the first signal transmssion line and second signal transmission line incoming level signal
Two data-signals are compared to obtain data frame, extract its corresponding grade display data, remaining display data is formed
It is encoded into differential data frame and is sent to next drive module.
In step S104, specifically, since each driving chip divides input voltage, lead to each drive
The incoming level of dynamic chip differs, and therefore, next driving chip is needed according to incoming level itself to upper one driving core
The data frame that piece is exported carries out level conversion so that driving chip can identify received data frame.
Specifically, the number by calculating driving chip, can realize input voltage being evenly distributed to each driving core
On piece, and keep the difference between the voltage of power module power input and the voltage of power output end constant.
Another kind embodiment of the invention also provides a kind of driving chip, and driving chip is connected in series with multiple driving chips,
Driving chip power input connects upper driving chip power output end, and driving chip power output end connects next driving core
The power input of piece, the data input pin of driving chip connect upper driving chip data output end, the data of driving chip
Output terminal connects the data input pin of next driving chip, the current output terminal connection LED light of the driving chip.
Driving chip divides the voltage of input power by way of connecting with remaining driving chip to obtain work
Make voltage, and output voltage gives next driving chip connected to it.
Driving chip carries out level conversion to obtain identifiable data frame according to data frame input voltage to data frame, and
Its corresponding grade display data is extracted from the identifiable data frame, and sends data frame to next driving chip.
Driving chip controls corresponding LED light to be shown according to its corresponding grade display data, makes unlatching LED
The constant current hold of the LED light is flowed through during lamp, and the voltage and electricity of power input are kept when LED light opens and closes
Difference between the voltage of source output terminal is constant.
As shown in Figure 4 and Figure 5, driving chip includes constant-current driven module 20 and decoder module 30.
The input terminal of decoder module 30 is the data input pin of driving chip, and the first output terminal of decoder module 30 is driving
The data output end of chip, the control terminal of the second output terminal connection constant-current driven module 20 of decoder module 30.
Decoder module 30 extracts its corresponding grade display data from data frame, and sends data frame to next driving mould
Block, and this grade of display data is decoded, decoded display data is sent to constant-current driven module 20.
Constant-current driven module 20 controls LED light connected to it to be shown according to decoded display data, make unlatching
The constant current hold of the LED light is flowed through during the LED light.
Wherein, in a kind of embodiment, the driving chip in the 1st drive module receives DATA signal, passes through built-in solution
Code module 30, intercepts first data, and remaining data is sent by DO ports, the rest may be inferred for other chips.It is another
In kind of embodiment, the driving chip in the 1st drive module receives DATA signal, by built-in decoder module 30, interception the
One data, and total data is sent by DO ports, the rest may be inferred for other chips.
Decoder module 30 is decoded data, is converted into the control signal that OUT terminal mouth control LED is opened and closed, and
Constant-current driven module 20 is sent to, when OUT terminal mouth is opened, electric current is made not changed by the change of voltage.
Further, driving chip further includes Voltage stabilizing module 10, and the input terminal of Voltage stabilizing module 10 is the power supply of driving chip
Input terminal, the output terminal of Voltage stabilizing module 10 are the power output end of driving chip.
Voltage stabilizing module 10 is for the electricity of the voltage of holding power input and power output end when LED light opens and closes
Difference between pressure is constant.
Preferably, by calculating the number of driving chip, Voltage stabilizing module 10 can be realized and be evenly distributed to input voltage
On each driving chip.
Specifically, a kind of embodiment as decoder module 30, decoder module 30 includes signal sampling module 301, PWM
Scan module 303 and shaping regeneration module 304.
Signal sampling module 301 is used for gathered data frame, and carries out level conversion to data frame to obtain identifiable number
According to frame.
Specifically, since each driving chip divides input voltage, lead to the defeated of each driving chip
Enter level to differ, therefore, what next driving chip needs exported a upper driving chip according to incoming level itself
Data frame carries out level conversion so that driving chip can identify received data frame.
PWM scan modules 303 will decode for extracting this grade of display data from identifiable data frame and being decoded
Display data afterwards is sent to constant-current driven module 20, and sends data frame to the shaping regeneration module 304.
Shaping regeneration module 304 is used to be sent to next drive module after carrying out shaping to data frame.
Specifically, the another embodiment as decoder module 30, decoder module 30 include signal sampling module 301,
Internal control/external control judgment module 302, PWM scan modules 303 and shaping regeneration module 304.
Signal sampling module 301 is used for gathered data frame, and carries out level conversion to data frame to obtain identifiable number
According to frame.
Specifically, since each driving chip divides input voltage, lead to the defeated of each driving chip
Enter level to differ, therefore, what next driving chip needs exported a upper driving chip according to incoming level itself
Data frame carries out level conversion so that driving chip can identify received data frame.
Internal control/external control judgment module 302 is for judging whether to receive data frame, when judging result is to be, from reception
To data frame in extract its corresponding grade display data and be sent to PWM scan modules 303, when judging result is no,
According to this grade of display data of data acquisition of built-in effect algorithm offer and it is sent to PWM scan modules 303.
PWM scan modules 303 will decode for extracting this grade of display data from identifiable data frame and being decoded
Display data afterwards is sent to constant-current driven module, and sends data frame to shaping regeneration module 304.
Shaping regeneration module 304 is used to be sent to next drive module after carrying out shaping to data frame.
A kind of driving chip of the present invention, constant current driver circuit for LED and its control method, by the way that drive module is connected on one
It rises, when control source, input voltage is assigned in each drive module, can realize the input of different range voltage,
Reduce the attenuation of input voltage simultaneously, provide the reliability of system, and overall structure is simple, reduce product into
This, and pass through built-in constant-current driven module and ensure that each LED output current is not influenced by voltage, meanwhile, built-in decoding mould
Block can change the display duty ratio of each LED by data, and when detecting the input of driving chip no signal, drive
Dynamic chip cuts internal control effect automatically, can realize meteor, flowing water and other effects, and difference biography can also be used in signal transmission form
Defeated mode makes transmission data more accurate.
The above content is combine specific application implementation mode further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Several equivalent substitute or obvious modifications are made under the premise of not departing from present inventive concept, and performance or use is identical, all should
It is considered as belonging to present invention scope of patent protection determined by the appended claims.
Claims (4)
1. a kind of constant current driver circuit for LED, the constant current driver circuit for LED includes multiple drive modules, multiple driving moulds
The quantity of block is n, and n is positive integer more than 1, the power input connection input power of the 1st drive module, described 1st
The data input pin of drive module receives data frame, it is characterised in that：
The power output end of 1st drive module connects the power input of the 2nd drive module, the 1st driving
The data output end of module connects the data input pin of the 2nd drive module, and from the 2nd drive module successively according to going here and there step by step
Connection mode is connected to n-th of drive module；
Each drive module is divided to obtain operating voltage the voltage of input power by way of series connection, and exports electricity
It presses to next drive module connected to it；
1st drive module obtains this grade of display data, and sends data frame to the 2nd drive module；
2nd drive module carries out electricity according to data frame input voltage to the data frame that the 1st drive module exports
Flat turn is changed to obtain identifiable data frame, and its corresponding grade display data is extracted from the identifiable data frame,
And it sends data frame and is performed successively to n-th of drive module to the 3rd drive module, and thus in accordance with series system step by step；
Each drive module is shown according to the LED light that its corresponding grade display data controls it internal, makes unlatching
The constant current hold of the LED light is flowed through during the LED light；
The drive module includes LED light and driving chip, and the driving chip includes constant-current driven module and decoder module；
The anode of the LED light connects the power input of the driving chip and forms the power input of the drive module
End, the cathode of the LED light connect the control signal output of the driving chip, and the ground terminal of the driving chip is described
The power output end of drive module, the data input pin of the driving chip is the data input pin of the drive module, described
The data output end of driving chip is the data output end of the drive module；The input terminal of the decoder module is the driving
The data input pin of chip, the first output terminal of the decoder module are the data output end of the driving chip, the decoding
The second output terminal of module connects the control terminal of the constant-current driven module；
The decoder module extracts its corresponding grade display data from the data frame, and sends data frame to next driving
Module, and described grade display data is decoded, decoded display data is sent to the constant-current driven module；
The constant-current driven module controls LED light connected to it to be shown according to the decoded display data, makes out
The constant current hold of the LED light is flowed through when opening the LED light；
The decoder module includes signal sampling module, internal control/external control judgment module, PWM scan modules and shaping regeneration mould
Block；
The signal sampling module is used for gathered data frame, and carries out level conversion to the data frame to obtain identifiable number
According to frame；
The internal control/external control judgment module is for judging whether to receive data frame, when judging result is to be, from what is received
Its corresponding grade display data is extracted in data frame and is sent to the PWM scan modules, when judging result is no, according to
This grade of display data of data acquisition of built-in effect algorithm offer is simultaneously sent to the PWM scan modules；
The PWM scan modules will solve for extracting this grade of display data from the identifiable data frame and being decoded
Display data after code is sent to the constant-current driven module, and send the data frame to the shaping regeneration module；
The shaping regeneration module is used to be sent to next drive module after carrying out shaping to the data frame；
It is described to be specially to obtain identifiable data frame to data frame progress level conversion：Each driving chip is right
Input voltage is divided, and the incoming level of each driving chip is caused to differ, and next driving chip is according to itself
The data frame that incoming level exports a upper driving chip carries out level conversion so that driving chip can identify what is received
Data frame；
The driving chip includes Voltage stabilizing module, and the input terminal of the Voltage stabilizing module is the power input of the driving chip,
The output terminal of the Voltage stabilizing module is the power output end of the driving chip；The Voltage stabilizing module be used for LED light open and
Keep the difference between the voltage of the power input and the voltage of the power output end constant during closing；
By calculating the number of driving chip, input voltage is evenly distributed on each driving chip by Voltage stabilizing module realization.
2. constant current driver circuit for LED as described in claim 1, which is characterized in that the decoder module further includes the first signal
Transmission line and second signal transmission line；
The decoder module obtains differential data frame according to first signal transmssion line and the second signal transmission line, and from
Its corresponding grade display data is extracted in the differential data frame, the differential data frame is sent to next drive module.
3. a kind of control method of constant current driver circuit for LED, the constant current driver circuit for LED includes multiple drive modules, multiple
The quantity of the drive module is n, and n is positive integer, the power input connection input power of the 1st drive module, the described 1st
The data input pin of a drive module receives data frame, it is characterised in that：
The control method includes the following steps：
Each drive module is divided by the voltage to input power to obtain operating voltage, and output voltage gives its company
The next drive module connect；
1st drive module obtains this grade of display data, and sends data frame to the 2nd drive module；
2nd drive module carries out level conversion according to input voltage to the data frame that the 1st drive module exports
To obtain identifiable data frame, and its corresponding grade display data is extracted from the identifiable data frame, and send
Data frame gives the 3rd drive module, and is performed successively to n-th of drive module thus in accordance with series system step by step；
Each drive module is shown according to the LED light that its corresponding grade display data controls it internal, makes unlatching
The constant current hold of the LED light is flowed through during the LED light；
The step of 1st drive module obtains this grade of display data be specially：
A. the 1st drive module judges whether to receive data frame, is then to perform step B, no, then performs step C；
B. its corresponding grade display data is extracted from the data frame received；
C. this grade of display data of data acquisition provided according to built-in effect algorithm；
Each drive module is divided by the voltage to input power to obtain operating voltage, and output voltage gives its company
The next drive module connect is specially：Voltage stabilizing module keeps the voltage and electricity of power input when LED light opens and closes
Difference between the voltage of source output terminal is constant；By calculating the number of driving chip, input voltage is put down in Voltage stabilizing module realization
It is assigned on each driving chip；
2nd drive module carries out level conversion according to input voltage to the data frame that the 1st drive module exports
It is specially to obtain identifiable data frame：Each driving chip divides input voltage, leads to each driving
The incoming level of chip differs, the number that next driving chip exports a upper driving chip according to incoming level itself
Level conversion is carried out so that driving chip can identify received data frame according to frame.
4. a kind of driving chip, which is characterized in that the driving chip is connected in series with multiple driving chips, the driving chip
Power input connects upper driving chip power output end, and the driving chip power output end connects next driving chip
Power input, the data input pin of the driving chip connect upper driving chip data output end, the driving chip
Data output end connects the data input pin of next driving chip, the current output terminal connection LED light of the driving chip；
The driving chip divides the voltage of input power by way of connecting with remaining driving chip to obtain work
Make voltage, and output voltage gives next driving chip connected to it；
The driving chip carries out level conversion to obtain identifiable data frame according to data frame input voltage to data frame, and
Its corresponding grade display data is extracted from the identifiable data frame, and sends data frame to next driving chip；
The driving chip controls corresponding LED light to be shown according to its corresponding grade display data, makes unlatching institute
The constant current hold of the LED light is flowed through when stating LED light；
The driving chip includes constant-current driven module and decoder module；
The input terminal of the decoder module is the data input pin of the driving chip, and the first output terminal of the decoder module is
The data output end of the driving chip, the second output terminal of the decoder module connect the control of the constant-current driven module
End；
The decoder module extracts its corresponding grade display data from the data frame, and sends data frame to next driving
Module, and described grade display data is decoded, decoded display data is sent to the constant-current driven module；
The constant-current driven module controls LED light connected to it to be shown according to the decoded display data, makes out
The constant current hold of the LED light is flowed through when opening the LED light；
The decoder module includes signal sampling module, internal control/external control judgment module, PWM scan modules and shaping regeneration mould
Block；
The signal sampling module is used for gathered data frame, and carries out level conversion to the data frame to obtain identifiable number
According to frame；
The internal control/external control judgment module is for judging whether to receive data frame, when judging result is to be, from what is received
Its corresponding grade display data is extracted in data frame and is sent to the PWM scan modules, when judging result is no, according to
This grade of display data of data acquisition of built-in effect algorithm offer is simultaneously sent to the PWM scan modules；
The PWM scan modules will solve for extracting this grade of display data from the identifiable data frame and being decoded
Display data after code is sent to the constant-current driven module, and send the data frame to the shaping regeneration module；
The shaping regeneration module is used to be sent to next drive module after carrying out shaping to the data frame；
It is described to be specially to obtain identifiable data frame to data frame progress level conversion：Each driving chip is right
Input voltage is divided, and the incoming level of each driving chip is caused to differ, and next driving chip is according to itself
The data frame that incoming level exports a upper driving chip carries out level conversion so that driving chip can identify what is received
Data frame；
The driving chip includes Voltage stabilizing module, and the input terminal of the Voltage stabilizing module is the power input of the driving chip,
The output terminal of the Voltage stabilizing module is the power output end of the driving chip；The Voltage stabilizing module be used for LED light open and
Keep the difference between the voltage of power input and the voltage of power output end constant during closing；
By calculating the number of driving chip, input voltage is evenly distributed on each driving chip by Voltage stabilizing module realization.
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| CN107896400A (en) * | 2017-12-12 | 2018-04-10 | 无锡德芯微电子有限公司 | Utilize the LED drive circuit and data transmission method of power line transmission data |
| CN110784965B (en) * | 2018-07-30 | 2023-04-25 | 上海雷舞照明技术有限公司 | Driving device and driving chip |
| CN110782804B (en) * | 2018-07-30 | 2021-11-12 | 上海雷舞照明技术有限公司 | Display device and lighting system |
| CN110784962B (en) * | 2018-07-30 | 2022-02-15 | 上海雷舞照明技术有限公司 | Cascaded lighting system and lighting method |
| CN112911768A (en) * | 2021-02-01 | 2021-06-04 | 佛山市南海舒博光电科技有限公司 | Laser lamp ILDA signal processing system and processing method thereof |
| CN112908249B (en) * | 2021-02-10 | 2022-01-25 | 深圳市美矽微半导体有限公司 | LED chip and cascade system of LED chips |
| CN113692088A (en) * | 2021-08-13 | 2021-11-23 | 广州腾龙健康实业股份有限公司 | LED lamp system and LED lamp control method for reducing instantaneous power |
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