CN105307315A - Color LED lamp string driving circuit and LED lamp string - Google Patents
Color LED lamp string driving circuit and LED lamp string Download PDFInfo
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- CN105307315A CN105307315A CN201410374997.7A CN201410374997A CN105307315A CN 105307315 A CN105307315 A CN 105307315A CN 201410374997 A CN201410374997 A CN 201410374997A CN 105307315 A CN105307315 A CN 105307315A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention is applicable to the field of LED driving control, and provides a color LED lamp string driving circuit and an LED lamp string. The circuit comprises a display control signal generation unit, multiple driving control units, and multiple LED display units, wherein each driving control unit correspondingly drives at least 2N LED display units; each N LED display units are serially connected to form a display string, the forward input end of the display string is connected with a power end of the driving control unit, and the backward input end of the display string is connected with the first output end and the second output end of the corresponding driving control unit. Through changes of potential outputted by the driving control unit, the LED display unit with only two pins is driven, color multi-mode driving is realized in a condition of not additionally adding the control signal pins, machine mass production is facilitated, the manufacturing time and the cost are reduced, driving such as multiple colors, multi-color flashing, full-color light mixing and color flashing and displaying can be realized, and dynamic effects are enhanced.
Description
Technical field
The invention belongs to LED drived control field, particularly relate to a kind of color LED lamp string drive circuit and LED string.
Background technology
Current light-emitting diode (LightEmittingDiode, LED) lamp string is widely used in the field such as street illumination on building, view, environment, bridge, stadium and airport, realizes the application of various modes flicker change.
But, existing LED drive circuit, or can only realize carrying out the changes of simply glimmering such as order bright light to monochromatic LED, it dodges method dullness and can only monochromaticly show, cannot change color, be difficult to the multiple application demand of satisfied existing market;
Or, need in LED display unit, increase single-chip microcomputer signal input pin and signal transmission line, but prior art can only produce the LED display unit of two pins in enormous quantities with machine, therefore this drive circuit can add many wire rod costs and wire rod process time, reduces production efficiency.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of color LED lamp string drive circuit, and the LED display unit transmission line being intended to solve in current color LED drive circuit is too much, cannot realize the problem produced in batches, cost is high.
The embodiment of the present invention is achieved in that a kind of color LED lamp string drive circuit, and described color LED lamp string drive circuit comprises:
Display control signal generation unit, for receiving user instruction, and generates display control signal according to user instruction;
Timing control unit, for generating drive control signal and sequence control code according to described display control signal, the input of described timing control unit is connected with described display control signal generation unit, and the power end of described timing control unit is connected with supply voltage;
Multiple LED display unit, for luminous according to described drive control signal driving LED, the formation one of every M LED display unit serial connection shows string, and N number of display connection in series-parallel forms LED string, and each LED display unit has positive input and reverse input end;
For M LED display unit serial connection:
The positive input of LED display unit and reverse input end are respectively positive input and the reverse input end of described display string; Or
Multiple LED display unit serial connection is a not closed-loop path, and between adjacent two LED display units, the reverse input end of a LED display unit is connected with the positive input of another LED display unit; The positive input of the LED display unit do not connected is the positive input of described display string, and the reverse input end of another LED display unit do not connected is the reverse input end of described display string;
The positive input of multiple display string is all connected with the control output end of described timing control unit, and the reverse input end of multiple display string is all connected with the grounded circuit link of described timing control unit;
Wherein, M be more than or equal to 1 natural number, N be greater than 1 natural number.
Another object of the embodiment of the present invention is to provide a kind of LED string adopting above-mentioned multi-mode LED cascade control circuit.
The potential change that the embodiment of the present invention is exported by timing control unit drives the LED display unit only having two pins, drive when not needing to realize when additionally increasing control signal pin colored multi-mode, be conducive to machine to produce in a large number, reduce manufacturing man-hours and cost, and the drived control of the colored various modes such as colorful shining look, polychrome bounce flash, full-color mixed light, color variations horse race can be realized, significantly improve color and the dynamic effect of product, meet the diversified application demand in lamp string market.
Accompanying drawing explanation
The structure chart of the color LED lamp string drive circuit that Fig. 1 provides for the embodiment of the present invention;
The exemplary construction figure of display control signal generation unit in the color LED lamp string drive circuit that Fig. 2 provides for the embodiment of the present invention;
The exemplary construction figure of the color LED lamp string drive circuit of the 5V DC-voltage supply that Fig. 3 provides for the embodiment of the present invention;
The exemplary construction figure of the color LED lamp string drive circuit of the 24V DC-voltage supply that Fig. 4 provides for the embodiment of the present invention;
The preferred electrical architecture figure of the color LED lamp string drive circuit of the DC power supply that Fig. 5 provides for the embodiment of the present invention;
The preferred exemplary circuit structure diagram of timing control unit, driving control unit in the color LED lamp string drive circuit of the DC power supply that Fig. 6 provides for the embodiment of the present invention;
The exemplary circuit structure chart of timing control unit in the color LED lamp string drive circuit of the ac power supply that Fig. 7 provides for the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The potential change that the embodiment of the present invention is exported by driving control unit drives the LED display unit only having two pins, drives when not needing to realize colored multi-mode when additionally increasing control signal pin.
Below in conjunction with specific embodiment, realization of the present invention is described in detail:
Fig. 1 shows the structure of the color LED lamp string drive circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this color LED lamp string drive circuit, comprising:
Display control signal generation unit 11, for receiving user instruction, and generates display control signal according to user instruction;
In embodiments of the present invention, this user instruction can pass through button or touch, or even the mode of acoustic control inputs to display control signal generation unit 11, and this display control signal generation unit 11 can be exported by the wireless transmission method such as infrared ray or bluetooth or wire transmission mode.
Timing control unit 12, for generating drive control signal and sequence control code according to display control signal, the input of timing control unit 12 is connected with display control signal generation unit 11, and the power end of timing control unit 12 is connected with supply voltage;
In embodiments of the present invention, timing control unit 12 exports 24V operating voltage (drive control signal) and sequence control code to after the infrared ray display control signal decoding received.
Multiple LED display unit 14, for luminous according to drive control signal driving LED, every M LED display unit 14 is connected in series formation one and shows string, and N number of display connection in series-parallel forms LED string, and each LED display unit 14 has positive input V+ and reverse input end V-;
M LED display unit 14 is connected in series:
If now supply voltage is 5V direct voltage, so, multiple LED display unit 14 is in parallel, and the positive input V+ of each LED display unit 14 (also can be understood as an independent LED display unit and form a display string) and reverse input end V-is respectively positive input and the reverse input end of this display string;
The positive input of multiple display string 1pcs-Npcs (LED display unit 14) is all connected with the control output end V+ of timing control unit 12, and the reverse input end of multiple display string 1pcs-Npcs (LED display unit 14) is all connected with the grounded circuit link V-of timing control unit 12;
Wherein, M be more than or equal to 1 natural number, N be greater than 1 natural number.
In embodiments of the present invention, because the driving chip of in LED display unit 14 approximately needs the voltage of about 4V, therefore this LED string adopts the structure of multiple LED display unit 14 parallel connection to drive.
In embodiments of the present invention, each LED display unit 14 only has two pins, can be produced in a large number by machine, can significantly reduce man-hour and cost, first in LED display unit 14, (the 3rd driving chip MCU3) pre-sets multiple sudden strain of a muscle method pattern, include but not limited to colorful shining look, polychrome bounce flash, full-color mixed light, color variations horse race etc., the change in voltage that the control output end of detecting timing control unit 12 exports after multiple LED display unit 14 is in parallel, and then realize colorful shining look, polychrome bounce flash, full-color mixed light, the displaying of the colored multiple sudden strain of a muscle method patterns such as color variations horse race.
The potential change that the embodiment of the present invention is exported by timing control unit drives the LED display unit only having two pins, drive when not needing to realize when additionally increasing control signal pin colored multi-mode, be conducive to machine to produce in a large number, reduce manufacturing man-hours and cost, and the drived control of the colored various modes such as colorful shining look, polychrome bounce flash, full-color mixed light, color variations horse race can be realized, significantly improve color and the dynamic effect of product, meet the diversified application demand in lamp string market.
Fig. 2 shows the structure of display control signal generation unit in the color LED lamp string drive circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this display control signal generation unit 11 comprises:
Resistance R1, electric capacity C1, the first switching tube Q1, the first LED 1, first processor U1 and signal receiving module 111;
The anode of the first LED 1 is connected with 3V supply voltage with one end of electric capacity C1 simultaneously, the negative electrode of the first LED 1 is connected with the input of the first switching tube Q1, the output head grounding of the first switching tube Q1, the control end of the first switching tube Q1 is connected with the 12 coffret IO11 of first processor U1 by resistance R1, the other end of electric capacity C1 and the earth terminal GND of first processor U1 ground connection simultaneously, the power end VDD of first processor U1 is connected with the anode of the first LED 1, first to the 11 coffret IO0-IO10 of first processor U1 is connected with signal receiving module 111,
For display control signal generation unit, receive user instruction by signal receiving module 111, by the first LED 1 output display control signal.
As one embodiment of the invention, signal receiving module 111 can adopt switch S 1-S22 to form switch arrays and receive user instruction, and touch-screen also can be adopted to receive.
As one embodiment of the present invention, the first LED 1 can be preferably infrared light emitting diode, and radio frequency (RF) microwave line also can be adopted to replace, and sends intensity, and then reach longer-distance control to strengthen signal.
As one embodiment of the present invention, first switching tube Q1 can adopt NPN type triode or field effect transistor to realize, when adopting NPN type triode, the input of the current collection of NPN type triode very the first switching tube Q1, the output of the transmitting of NPN type triode very the first switching tube Q1, the base stage of NPN type triode is the control end of the first switching tube Q1.
In embodiments of the present invention, user instruction is passed to first processor U1 by signal receiving module 111, is undertaken judging, processing by first processor U1, then controls the first LED 1 by the first switching tube Q1 and send infrared ray display control signal.
Fig. 3 shows the exemplary construction of the color LED lamp string drive circuit of the 5V DC-voltage supply that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this timing control unit 12 comprises:
Clamper bleeder circuit 121, the input of clamper bleeder circuit 121 is the power end of timing control unit 12;
5th driving chip MCU5, the power end VDD of the 5th driving chip MCU5 is connected with the first output of clamper bleeder circuit 121, the earth terminal GND of the 5th driving chip MCU5 is connected with the second output of clamper bleeder circuit 121, and the first transmission ends IO1 of the 5th driving chip MCU5 is the input of timing control unit 12;
ON-OFF control circuit 122, the input of ON-OFF control circuit 122 is connected with the input of clamper bleeder circuit 121, ON-OFF control circuit 122 control end be connected with the second transmission ends IO2 of the first driving chip MCU1, the output of ON-OFF control circuit 122 is the control output end of timing control unit 12.
As one embodiment of the present invention, clamper bleeder circuit 121 comprises:
Resistance R61, resistance R62, electric capacity C61, electric capacity C63;
One end of resistance R61 and electric capacity C61 is the input of clamper bleeder circuit 121 simultaneously, the other end ground connection simultaneously of resistance R61 and electric capacity C61, one end of resistance R61 is also connected with one end of resistance R62, the other end of resistance R62 is that the first output of clamper bleeder circuit 121 is connected with one end of electric capacity C63, and the other end of electric capacity C63 is the second output head grounding of clamper bleeder circuit 121.
In embodiments of the present invention, the reverse input end that timing control unit 12 is gone here and there for display provides a grounded circuit, can adopt resistance R56 ground connection realization, one end of this resistance R56 is the grounded circuit link of timing control unit 12, the other end ground connection of resistance R56;
ON-OFF control circuit 122 comprises:
Resistance R55 and the 13 switching tube Q13;
One end of resistance R55 is that the input of ON-OFF control circuit 122 is connected with the input of the 13 switching tube Q13, the other end of resistance R55 is that the control end of ON-OFF control circuit 122 is connected with the control end of the 13 switching tube Q13, and the output of the 13 switching tube Q13 is the output of ON-OFF control circuit 122.
As one embodiment of the present invention, 13 switching tube Q13 can adopt P type metal-oxide-semiconductor or thyristor to realize, wherein, the source electrode of P type metal-oxide-semiconductor is the input of the 13 switching tube Q13, the drain electrode of P type metal-oxide-semiconductor is the output of the 13 switching tube Q13, and the grid of P type metal-oxide-semiconductor is the control end of the 13 switching tube Q13.
LED display unit 14 comprises:
Resistance R71, electric capacity C71, diode D71, the 6th driving chip MCU6, red light emitting diodes LED_R, green LED LED_G, blue LED LED_B;
The anode of diode D71 is that the forward output of LED display unit 14 is connected with the 4th transmission ends IO4 of the 6th driving chip MCU6, the negative electrode of diode D71 simultaneously with one end of resistance R71, one end of electric capacity C71 is connected with the power end VDD of the 6th driving chip MCU6, the other end of resistance R71 is that the inverse output terminal of LED display unit 14 is connected with the earth terminal GND of the other end of electric capacity C71 and the 6th driving chip MCU6, first of 6th driving chip MCU6, second, 3rd transmission ends IO1, IO2, IO3 respectively with red light emitting diodes LED_R, green LED LED_G, the negative electrode of blue LED LED_B connects, red light emitting diodes LED_R, green LED LED_G, the anode of blue LED LED_B is connected with the anode of diode D71 simultaneously.
In embodiments of the present invention, the operating voltage that timing control unit 12 exports gives power end VDD and the 4th transmission ends IO4 of the 6th driving chip MCU6 in LED display unit 14 simultaneously, both are all high level, when timing control unit 12 export operating voltage fall instantaneously recover high level again for low level time, the 4th transmission ends IO4 of the 6th driving chip MCU6 receives low and high level change, and its power end VDD is powered by diode D71, when operating voltage falls down, can be undertaken discharging by electric capacity C71 and the 6th driving chip MCU6 powered, to ensure that the 6th driving chip MCU6 normally works, diode D71 also can prevent electric charge from bleeding off electric charge via V+ end simultaneously, to slow down power down time, resistance R71 can play the effect regulating electric discharge.
As one embodiment of the invention, can also adopt 24V DC-voltage supply, so now, multiple LED display unit 14 should first be connected in series and connect, and concrete structure is see Fig. 4:
Multiple LED display unit 14 serial connection is a not closed-loop path, and between adjacent two LED display units, the reverse input end V-of a LED display unit is connected with the positive input V+ of another LED display unit; The positive input V+ of the LED display unit do not connected is the positive input of display string, and the reverse input end V-of another LED display unit do not connected is the reverse input end of display string;
The positive input of multiple display string (1set-Mset) is all connected with the control output end V+ of timing control unit 12, and the reverse input end of multiple display string (1set-Mset) is all connected with the grounded circuit link V-of timing control unit 12;
Wherein, M be more than or equal to 1 natural number, N be greater than 1 natural number.
As one embodiment of the invention, this timing control unit 12 comprises:
Clamper bleeder circuit 121, the input of clamper bleeder circuit 121 is the power end of timing control unit 12;
5th driving chip MCU5, the power end VDD of the 5th driving chip MCU5 is connected with the first output of clamper bleeder circuit 121, the earth terminal GND of the 5th driving chip MCU5 is connected with the second output of clamper bleeder circuit 121, and the first transmission ends IO1 of the 5th driving chip MCU5 is the input of timing control unit 12;
ON-OFF control circuit 122, the input of ON-OFF control circuit 122 is connected with the input of clamper bleeder circuit 121, ON-OFF control circuit 122 control end be connected with the second transmission ends IO2 of the first driving chip MCU1, the output of ON-OFF control circuit 122 is the control output end of timing control unit 12.
As one embodiment of the present invention, clamper bleeder circuit 121 comprises:
Resistance R51, resistance R52, resistance R53, resistance R54, electric capacity C51, electric capacity C53 and voltage stabilizing didoe ZD51;
One end of resistance R51 and electric capacity C51 is the input of clamper bleeder circuit 121 simultaneously, the other end ground connection simultaneously of resistance R51 and electric capacity C51, one end of resistance R51 is also connected with one end of resistance R54 and the negative electrode of voltage stabilizing didoe ZD51 simultaneously, the other end of resistance R54 is that the first output of clamper bleeder circuit 121 is connected with one end of electric capacity C53, the other end of electric capacity C53 is that the second output of clamper bleeder circuit 121 is connected with the anode of voltage stabilizing didoe ZD51, the anode of voltage stabilizing didoe ZD51 is also connected with one end of resistance R52 and resistance R53 simultaneously, the other end ground connection simultaneously of resistance R52 and resistance R53.
The structure of ON-OFF control circuit 122 describes at above-described embodiment, repeats no more herein.
Single 14 yuan of LED display comprises:
Resistance R21, electric capacity C11, diode D1, voltage stabilizing didoe ZD11, the 3rd driving chip MCU3, red LED chip LED _ R, green LEDs chip LED _ G, BLUE LED emissions chip LED _ B;
The anode of diode D1 is that the single forward output of 14 yuan 14 of LED display is connected with the 4th transmission ends of the 3rd driving chip MCU3, the negative electrode of diode D1 is connected with one end of resistance R21 and one end of electric capacity C11 simultaneously, the other end of resistance R21 is that the inverse output terminal of single 14 yuan 14 of LED display is connected with the other end of electric capacity C11, the negative electrode of diode D1 is also connected with the power end of the 3rd driving chip MCU3, 4th transmission ends of the 3rd driving chip MCU3 is also connected with the negative electrode of voltage stabilizing didoe ZD11, the anode of voltage stabilizing didoe ZD11 is connected with the other end of electric capacity C11 and the earth terminal of the 3rd driving chip MCU3 simultaneously, first of 3rd driving chip MCU3, second, 3rd transmission ends respectively with red LED chip LED _ R, green LEDs chip LED _ G, the negative electrode of BLUE LED emissions chip LED _ B connects, red LED chip LED _ R, green LEDs chip LED _ G, the anode of BLUE LED emissions chip LED _ B is connected with the anode of diode D1 simultaneously.
In embodiments of the present invention, multiple LED display unit 14 is connected in series, in two adjacent LED display units 14, one LED display unit 14 positive input V+ is connected with the reverse input end V-of another LED display unit 14, the positive input V+ of the LED display unit 14 wherein do not connected is the positive input of this display string, and the reverse input end V-of the LED display unit 14 do not connected is the reverse input end of this display string.
As one embodiment of the invention, general serial connection five LED display units 14 under the operating voltage of 24V, but be not defined as five LED display units, the series quantity of LED display unit is determined by the operating voltage of driving chip in the size of operating voltage and LED display unit.
In embodiments of the present invention, after 5th driving chip MCU5 receives display control signal by the first transmission ends IO1, control the of short duration closedown of the 13 switching tube Q13 by the second transmission ends IO2 output signal to open again, make LED display unit 14 receive level change, and then change sudden strain of a muscle method pattern.
The potential change that the embodiment of the present invention is exported by timing control unit drives the LED display unit only having two pins, drive when not needing to realize when additionally increasing control signal pin colored multi-mode, be conducive to machine to produce in a large number, reduce manufacturing man-hours and cost, and the drived control of the colored various modes such as colorful shining look, polychrome bounce flash, full-color mixed light, color variations horse race can be realized, significantly improve color and the dynamic effect of product, meet the diversified application demand in lamp string market.
Fig. 5 has gone out the preferred electrical architecture of the color LED lamp string drive circuit of the DC power supply that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this color LED lamp string drive circuit can also comprise:
Multiple driving control unit 13, for generating multiple driving display according to drive control signal and sequence control code, the power end of each driving control unit 13 is all connected with the control output end of timing control unit 12, and the input of each driving control unit 13 is all connected with the data output end of timing control unit 12;
The positive input of multiple display string is all connected with the power end of driving control unit 13, and the reverse input end of multiple display string is corresponding with multiple outputs of driving control unit 13 respectively to be connected.
In embodiments of the present invention, each driving control unit 13 correspondence drives multiple display string, timing control unit 12 gives multiple driving control unit 13 with single line output sequence control code DATA, each driving control unit 13 controls the change in voltage of multiple output according to sequence control code, display string is according to driving display and the luminescence of drive control signal driving LED.
Further, the exemplary construction of above-described embodiment is see Fig. 6:
Wherein, timing control unit 12 comprises:
Clamper bleeder circuit 121, the input of clamper bleeder circuit 121 is the power end of timing control unit 12;
First driving chip MCU1, the power end VDD of the first driving chip MCU1 is connected with the first output of clamper bleeder circuit 121, the earth terminal GND of the first driving chip MCU1 is connected with the second output of clamper bleeder circuit 121, the first transmission ends IO1 of the first driving chip MCU1 is the input of timing control unit 12, and the 3rd transmission ends IO3 of the first driving chip MCU1 is the data output end of timing control unit 12;
ON-OFF control circuit 122, the input of ON-OFF control circuit 122 is connected with the input of clamper bleeder circuit 121, ON-OFF control circuit 122 control end be connected with the second transmission ends IO2 of the first driving chip MCU1, the output of ON-OFF control circuit 122 is the control output end of timing control unit 12.
As one embodiment of the present invention, clamper bleeder circuit 121 comprises:
Resistance R20, resistance R2, electric capacity C10, electric capacity C2, voltage stabilizing didoe ZD1;
One end of electric capacity C10 is the input of clamper bleeder circuit 121, be connected with one end of resistance R20, resistance R2 simultaneously, the other end of electric capacity C10 and the other end of resistance R20 ground connection simultaneously, the other end of resistance R2 is that the first output of clamper bleeder circuit 121 is connected with the negative electrode of voltage stabilizing didoe ZD1 and one end of electric capacity C2 respectively, and the anode of voltage stabilizing didoe ZD1 is the second output of clamper bleeder circuit 121 and the other end ground connection simultaneously of electric capacity C2.
ON-OFF control circuit 122 comprises:
Resistance R3, resistance R4, second switch pipe Q2, the 3rd switching tube Q3;
One end of resistance R3 is that the input of ON-OFF control circuit 122 is connected with the input of the 3rd switching tube Q3, the other end of resistance R3 is connected with the control end of the 3rd switching tube Q3, the output of the 3rd switching tube Q3 is the output of ON-OFF control circuit 122, the input of the 3rd switching tube Q3 is also connected with one end of resistance R4, the other end of resistance R4 is connected with the input of second switch pipe Q2, the control end of second switch pipe Q2 is the control end of ON-OFF control circuit 122, the output head grounding of second switch pipe Q2.
As one embodiment of the present invention, second switch pipe Q2 can adopt N-type metal-oxide-semiconductor or thyristor to realize, wherein, the drain electrode of N-type metal-oxide-semiconductor is the input of second switch pipe Q2, the source electrode of N-type metal-oxide-semiconductor is the output of second switch pipe Q2, and the grid of N-type metal-oxide-semiconductor is the control end of second switch pipe Q2;
3rd switching tube Q3 can adopt P type metal-oxide-semiconductor or thyristor to realize, wherein, the source electrode of P type metal-oxide-semiconductor is the input of the 3rd switching tube Q3, and the drain electrode of P type metal-oxide-semiconductor is the output of the 3rd switching tube Q3, and the grid of P type metal-oxide-semiconductor is the control end of the 3rd switching tube Q3.
In embodiments of the present invention, the input of clamper bleeder circuit 11 is 24V direct current supply, by electric capacity C10 filtering, after resistance R2 dividing potential drop, make the power end vdd voltage clamper of the first driving chip MCU1 at 5.1V by voltage stabilizing didoe ZD1 again, the first transmission ends IO1 of the first driving chip MCU1 receives display control signal by antenna, after the first driving chip MCU1 process, export high level continuity signal by the second transmission ends IO2 control second switch pipe Q2 conducting, the 3rd switching tube Q3 conducting is controlled after second switch pipe Q2 conducting, load lamp string is made to produce 24V operating voltage, control multiple driving control unit 13 via the second transmission ends IO2 output sequence control code DATA again to work.
Herein, ON-OFF control circuit 122 can export a low level reset signal, driving control unit 13 can be resetted via power-off, work after reset starts the initial stage, because in each driving control unit 13, the operating frequency of driving chip is more consistent, therefore some LED flickers have synchronous effect, now LED string shows as neat sudden strain of a muscle pattern, the operating frequency of the driving chip afterwards in each driving control unit 13 starts to produce difference, now the first driving chip MCU1 matching design sudden strain of a muscle method of going out to flash again, coordinate the sudden strain of a muscle method that the difference of frequency makes sudden strain of a muscle method and color escape dodge together with face, and then produce the effect of the sudden strain of a muscle method section of changing, the frequency drift of the single-chip microcomputer (the first driving chip MCU1) chosen due to the embodiment of the present invention is less, therefore the visual flicker time difference that the frequency drift difference within the quite a long time between each LED is formed is no more than 0.3 second, therefore LED string can show flowing flash pattern, after chip operation a period of time to be driven, increase gradually when the visual flicker time that the operating frequency difference of driving chip causes too greatly, now each LED sudden strain of a muscle method is irregular, LED string presents random flash pattern, now can control the first driving chip MCU1 output signal control switch control circuit 122 and export a low level reset signal again, driving control unit 13 is all resetted, re-start neat sudden strain of a muscle pattern.Repetition like this, LED string can produce the effect of automatic Display.
As one embodiment of the invention, this driving control unit 13 comprises:
Resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, electric capacity C3, voltage stabilizing didoe ZD2, the 4th switching tube Q4, the 5th switching tube Q5 and the second driving chip MCU2;
One end of resistance R5 is that the power end of driving control unit 13 is connected with one end of resistance R6, the other end of resistance R5 is connected with the other end of resistance R6 and the negative electrode of voltage stabilizing didoe ZD2 simultaneously, the negative electrode of voltage stabilizing didoe ZD2 is also connected with one end of resistance R7 and one end of electric capacity C3 simultaneously, the anode of voltage stabilizing didoe ZD2, the other end of resistance R7 and the other end of electric capacity C3 ground connection simultaneously, the power end VDD of the second driving chip MCU2 is connected with the negative electrode of voltage stabilizing didoe ZD2, the 3rd transmission ends IO3 of the second driving chip MCU2 is the input of driving control unit 13, the first transmission ends IO1 of the second driving chip MCU2 is connected with the control end of the 4th switching tube Q4 and one end of resistance R10 simultaneously, the output of the 4th switching tube Q4 and the other end of resistance R10 ground connection simultaneously, the input of the 4th switching tube Q4 is connected with one end of resistance R9 and one end of resistance R8 simultaneously, the other end of resistance R9 is connected with one end of resistance R5, the other end of resistance R8 is the first output of driving control unit 13, the second transmission ends IO2 of the second driving chip MCU2 is connected with one end of resistance R13 and the control end of the 5th switching tube Q5 simultaneously, the other end of resistance R13 and the output of the 5th switching tube Q5 ground connection simultaneously, the input of the 5th switching tube Q5 is connected with one end of resistance R12 and one end of resistance R11 simultaneously, the other end of resistance R12 is connected with one end of resistance R5, the other end of resistance R11 is the second output of driving control unit 13.
As one embodiment of the present invention, 4th switching tube Q4, the 5th switching tube Q5 all can adopt N-type metal-oxide-semiconductor or thyristor to realize, wherein, the drain electrode of N-type metal-oxide-semiconductor is the input of the 4th switching tube Q4 or the 5th switching tube Q5, the source electrode of N-type metal-oxide-semiconductor is the output of the 4th switching tube Q4 or the 5th switching tube Q5, and the grid of N-type metal-oxide-semiconductor is the control end of the 4th switching tube Q4 or the 5th switching tube Q5.
As one embodiment of the invention, the embodiment that the structure of LED display unit 14 is corresponding with Fig. 4 is identical, repeats no more herein.
In embodiments of the present invention, second driving chip MCU2 outputs signal to control the 4th switching tube Q4 on lamp string and the 5th switching tube Q5 to after sequence control code DATA decoding by the first transmission ends IO1 and the second transmission ends IO2, when switching tube (N-type metal-oxide-semiconductor) conducting, the LED display list 14 pieces showing the upper serial connection of string just has voltage turn-on and starts working, and when switching tube (N-type metal-oxide-semiconductor) of short duration shutoff being opened again after the second driving chip MCU2 decoding, be controlled by the list group LED string (display string) of this switching tube (N-type metal-oxide-semiconductor), then can detect the change of power supply low and high level simultaneously and carry out the replacing of flash pattern.
First driving chip MCU1 calculates according to the frequency drift in driving control unit 13 and the required time of user to random flash pattern the timing length producing reset signal, to obtain best operating time scope, and then control the time of dodging pattern, flowing flash pattern and random flash pattern together.
Further, driving control unit 13 can control a road display string by means of only a control end, therefore can determine the quantity that can drive display string according to the actual pin number of the second driving chip MCU2.
The embodiment of the present invention is by increasing multiple driving control unit to increase the quantity driving display string, each driving control unit can be gone here and there in a driving N display, so often increase a driving control unit, the display string (LED display unit) that can drive can be doubled and redoubled.
What deserves to be explained is, because LED display unit 14 can be driven by driving control unit 13, the reverse input end of the LED display unit 14 (display string) therefore after series connection does not need timing control unit 12 to provide grounded circuit, and timing control unit 12 can simplify the circuit structure of grounded circuit link part.
Embodiment of the present invention elder generation (the 3rd driving chip MCU3) in LED display unit 14 pre-sets multiple sudden strain of a muscle method pattern, include but not limited to colorful shining look, polychrome bounce flash, full-color mixed light, color variations horse race etc., driving control unit 13 is produced via controlled switching tube conducting and closedown and is powered and power-off, the level that the 3rd driving chip MCU3 in LED display single 14 can detect its normal phase input end V+ and inverting input V-changes, when driving control unit 13 output voltage is high by low turn, the LED display unit 14 of serial connection is just changed and is once dodged method pattern, therefore, the LED display unit 14 that the voltage signal that driving control unit 13 can be utilized constantly to export saltus step controls to be connected in series realizes colorful shining look, polychrome bounce flash, full-color mixed light, the displaying of the colored multiple sudden strain of a muscle method patterns such as color variations horse race, and the problem that single 14 outsides of LED display increase signal cabling again can be saved, decrease wire rod cost, improve production efficiency.
As one embodiment of the present invention, this LED shows single 14 both can be produced on same printed circuit board (PrintedCircuitBoard together with timing control unit 12 or driving control unit 13, PCB) on, also can nation fix on the support of LED string, or integrated envelope is entered in LED.
The potential change that the embodiment of the present invention is exported by driving control unit drives the LED display unit only having two pins, drive when not needing to realize when additionally increasing control signal pin colored multi-mode, be conducive to machine to produce in a large number, reduce manufacturing man-hours and cost, and the drived control of the colored various modes such as colorful shining look, polychrome bounce flash, full-color mixed light, color variations horse race can be realized, significantly improve color and the dynamic effect of product, meet the diversified application demand in lamp string market.
Fig. 7 has gone out the exemplary circuit structure of timing control unit in the color LED lamp string drive circuit of the ac power supply that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, color LED lamp string drive circuit can also directly be connected with the alternating current between 85V to 265V, now should increase by a power-switching circuit 123 between AC supply voltage and clamper bleeder circuit 121, be that subsequent conditioning circuit is powered for alternating current being converted to direct current, this power-switching circuit 123 comprises:
Resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, electric capacity C21, electric capacity C22, electric capacity C23, electric capacity C24, diode D4, diode D5, diode D6, controlled rectifier device D7, the 6th switching tube Q6, optocoupler U1, transformer, the first rectifier bridge stack UR1 and power management chip IC1;
Two ac input ends of the first rectifier bridge stack UR1 are that the power end of power-switching circuit 123 is connected with AC supply voltage, the direct-flow positive pole output of the first rectifier bridge stack UR1 is by electric capacity C21 ground connection, the direct current cathode output end ground connection of the first rectifier bridge stack UR1, the direct-flow positive pole output of the first rectifier bridge stack UR1 is also connected with one end of resistance R28, the other end of resistance R28 is connected with the power end VDD of power management chip IC1 and one end of resistance R22 simultaneously, the power end VDD of power management chip IC1 is also by electric capacity C22 ground connection, the earth terminal GND ground connection of power management chip IC1, the other end of resistance R22 is connected with the negative electrode of diode D4, the anode of diode D4 is connected with the Same Name of Ends of transformer second coil L2, the different name end ground connection of transformer second coil L2, one end of resistance R28 is also connected with the negative electrode of diode D5 and the Same Name of Ends of transformer first coil L1 simultaneously, the anode of diode D5 is connected with the different name end of transformer first coil L1 and the input of the 6th switching tube Q6 simultaneously, the output of the 6th switching tube Q6 is by resistance R23 ground connection, the control end of the 6th switching tube Q6 is connected with the control end Gate of power management chip IC1, the selecting side CS of power management chip IC1 is connected with the output of the 6th switching tube Q6, feedback end FB and the optocoupler U1 of power management chip IC1 receive input and are connected, optocoupler U1 receives output head grounding, optocoupler U1 launches input and is connected with one end of resistance R24, the other end of resistance R24 is that the output of power-switching circuit 123 is connected with the input of clamper bleeder circuit 121, the other end of resistance R24 is also connected with the negative electrode of diode D6, the anode of diode D6 is connected with the Same Name of Ends of transformer tertiary coil L3, the negative electrode of diode D6 is also by electric capacity C23 ground connection, the different name end ground connection of transformer tertiary coil L3, optocoupler U1 launches output and is connected with one end of electric capacity C24 and the negative electrode of controlled rectifier device D7 simultaneously, the other end of electric capacity C24 is connected with one end of resistance R25, the other end of resistance R25 is connected with one end of resistance R26 and one end of resistance R27 simultaneously, the other end of resistance R26 is connected with the other end of resistance R24, the other end of resistance R27 and the anode of controlled rectifier device D7 ground connection simultaneously, the control end of controlled rectifier device D7 is connected with one end of resistance R27.
Understandably, this first rectifier bridge stack UR1 also can adopt four M7 type genotrons to replace, or adopts the integrated circuit (IC) chip that function is identical to replace.
6th switching tube Q6 can adopt the thyristor of N-type metal-oxide-semiconductor or correspondence to realize, the drain electrode of this N-type metal-oxide-semiconductor is the input of the 6th switching tube Q6, the source electrode of N-type metal-oxide-semiconductor is the output of the 6th switching tube Q6, and the grid of N-type metal-oxide-semiconductor is the control end of the 6th switching tube Q6.As one embodiment of the present invention, controlled rectifier device D7 can adopt 431 type voltage stabilizing chips to realize.
In embodiments of the present invention, power-switching circuit 123 turns DC circuit for flyback exchanges, wherein resistance R26, resistance R27 is by after output end voltage dividing potential drop, optocoupler U1 is utilized to feed back to the feedback end FB of power management chip IC3 as feedback signal, the voltage signal of the current flowing resistance R23 of the 6th switching tube Q6 is sensed again by the selecting side CS of power management chip IC3, comparing via this two signal the magnitude of voltage that circuit secondary side is exported is: D7 [(R26/R27)+1], wherein D7 is the operating voltage of controlled rectifier device D7 (such as 431 type voltage stabilizing chips), R26, R27 is resistance R26, the resistance of resistance R27, such as, 431 type voltage stabilizing chips maintain the balanced voltage of about 2.5V after power up always, if the voltage design exported by secondary side is 24V, need by resistance R26, the dividing potential drop resistance of resistance R27 passes feedback voltage back to power management chip IC3 via 431 type voltage stabilizing chips, power for clamper bleeder circuit 121 with the direct voltage making power transfer module 13 export as 24V.
The embodiment of the present invention not only goes for higher direct current, also goes for the alternating voltage of wider range, does not limit ensure that lamp string drives by power supply.
Another object of the embodiment of the present invention is to provide a kind of LED string adopting above-mentioned multi-mode LED cascade control circuit.
The potential change that the embodiment of the present invention is exported by driving control unit drives the LED display unit only having two pins, drive when not needing to realize when additionally increasing control signal pin colored multi-mode, be conducive to machine to produce in a large number, reduce manufacturing man-hours and cost, and the drived control of the colored various modes such as colorful shining look, polychrome bounce flash, full-color mixed light, color variations horse race can be realized, significantly improve color and the dynamic effect of product, meet the diversified application demand in lamp string market.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a color LED lamp string drive circuit, is characterized in that, described color LED lamp string drive circuit comprises:
Display control signal generation unit, for receiving user instruction, and generates display control signal according to user instruction;
Timing control unit, for generating drive control signal and sequence control code according to described display control signal, the input of described timing control unit is connected with described display control signal generation unit, and the power end of described timing control unit is connected with supply voltage;
Multiple LED display unit, for luminous according to described drive control signal driving LED, the formation one of every M LED display unit serial connection shows string, and N number of display connection in series-parallel forms LED string, and each LED display unit has positive input and reverse input end;
For M LED display unit serial connection:
The positive input of LED display unit and reverse input end are respectively positive input and the reverse input end of described display string; Or
Multiple LED display unit serial connection is a not closed-loop path, and between adjacent two LED display units, the reverse input end of a LED display unit is connected with the positive input of another LED display unit; The positive input of the LED display unit do not connected is the positive input of described display string, and the reverse input end of another LED display unit do not connected is the reverse input end of described display string;
The positive input of multiple display string is all connected with the control output end of described timing control unit, and the reverse input end of multiple display string is all connected with the grounded circuit link of described timing control unit;
Wherein, M be more than or equal to 1 natural number, N be greater than 1 natural number.
2. color LED lamp string drive circuit as claimed in claim 1, it is characterized in that, described display control signal generation unit comprises:
Resistance R1, electric capacity C1, the first switching tube, the first light-emitting diode, first processor and signal receiving module;
The anode of described first light-emitting diode is connected with supply voltage with one end of described electric capacity C1 simultaneously, the negative electrode of described first light-emitting diode is connected with the input of described first switching tube, the output head grounding of described first switching tube, the control end of described first switching tube is connected with a coffret of described first processor by described resistance R1, the other end of described electric capacity C1 and the earth terminal of described first processor ground connection simultaneously, the power end of described first processor is connected with the anode of described first light-emitting diode, other multiple coffret of described first processor is connected with described signal receiving module,
For described display control signal generation unit, receive user instruction, by described first light-emitting diode output display control signal by described signal receiving module.
3. color LED lamp string drive circuit as claimed in claim 1, it is characterized in that, described timing control unit comprises:
Clamper bleeder circuit, the input of described clamper bleeder circuit is the power end of described timing control unit;
First driving chip, the power end of described first driving chip is connected with the first output of described clamper bleeder circuit, the earth terminal of described first driving chip is connected with the second output of described clamper bleeder circuit, and the first transmission ends of described first driving chip is the input of described timing control unit;
ON-OFF control circuit, the input of described ON-OFF control circuit is connected with the input of described clamper bleeder circuit, described ON-OFF control circuit control end be connected with the second transmission ends of described first driving chip, the output of described ON-OFF control circuit is the control output end of described timing control unit.
4. color LED lamp string drive circuit as claimed in claim 3, it is characterized in that, described timing control unit also comprises a resistance R56, and one end of described resistance R56 is the grounded circuit link of described timing control unit, the other end ground connection of described resistance R56;
Described ON-OFF control circuit comprises:
Resistance R55 and the 13 switching tube;
One end of described resistance R55 is that the input of described ON-OFF control circuit is connected with the input of described 13 switching tube, the other end of described resistance R55 is that the control end of described ON-OFF control circuit is connected with the control end of described 13 switching tube, and the output of described 13 switching tube is the output of described ON-OFF control circuit.
5. color LED lamp string drive circuit as claimed in claim 1, it is characterized in that, described LED display unit comprises:
Resistance R21, electric capacity C11, diode D1, voltage stabilizing didoe ZD11, the 3rd driving chip, red light emitting diodes, green LED, blue LED;
The anode of described diode D1 is that the forward output of described LED display unit is connected with the 4th transmission ends of described 3rd driving chip, the negative electrode of described diode D1 is connected with one end of described resistance R21 and one end of described electric capacity C11 simultaneously, the other end of described resistance R21 is that the inverse output terminal of described LED display unit is connected with the other end of described electric capacity C11, the negative electrode of described diode D1 is also connected with the power end of described 3rd driving chip, 4th transmission ends of described 3rd driving chip is also connected with the negative electrode of described voltage stabilizing didoe ZD11, the anode of described voltage stabilizing didoe ZD11 is connected with the other end of described electric capacity C11 and the earth terminal of described 3rd driving chip simultaneously, first of described 3rd driving chip, second, 3rd transmission ends respectively with described red light emitting diodes, described green LED, the negative electrode of described blue LED connects, described red light emitting diodes, described green LED, the anode of described blue LED is connected with the anode of described diode D1 simultaneously.
6. color LED lamp string drive circuit as claimed in claim 1, it is characterized in that, described LED display unit comprises:
Resistance R71, electric capacity C71, diode D71, the 6th driving chip, red light emitting diodes, green LED, blue LED;
The anode of described diode D71 is that the forward output of described LED display unit is connected with the 4th transmission ends of described 6th driving chip, the negative electrode of described diode D71 simultaneously with one end of described resistance R71, one end of described electric capacity C71 is connected with the power end of described 6th driving chip, the other end of described resistance R71 is that the inverse output terminal of described LED display unit is connected with the earth terminal of the other end of described electric capacity C71 and described 6th driving chip, first of described 6th driving chip, second, 3rd transmission ends respectively with described red light emitting diodes, described green LED, the negative electrode of described blue LED connects, described red light emitting diodes, described green LED, the anode of described blue LED is connected with the anode of described diode D71 simultaneously.
7. color LED lamp string drive circuit as claimed in claim 1, it is characterized in that, described color LED lamp string drive circuit also comprises:
Multiple driving control unit, for generating multiple driving display according to described drive control signal and described sequence control code, the power end of each driving control unit is all connected with the control output end of described timing control unit, and the input of each driving control unit is all connected with the data output end of described timing control unit;
Each driving control unit correspondence drives multiple display string, and described display string is according to described driving display and the luminescence of described drive control signal driving LED;
The positive input of multiple display string is all connected with the power end of described driving control unit, and the reverse input end of multiple display string is corresponding with multiple outputs of described driving control unit respectively to be connected.
8. color LED lamp string drive circuit as claimed in claim 7, it is characterized in that, described clamper bleeder circuit comprises:
Resistance R20, resistance R2, electric capacity C10, electric capacity C2, voltage stabilizing didoe ZD1;
One end of described electric capacity C10 is the input of described clamper bleeder circuit, be connected with one end of described resistance R20, described resistance R2 simultaneously, the other end of described electric capacity C10 and the other end of described resistance R20 ground connection simultaneously, the other end of described resistance R2 is that the first output of described clamper bleeder circuit is connected with the negative electrode of described voltage stabilizing didoe ZD1 and one end of described electric capacity C2 respectively, and the anode of described voltage stabilizing didoe ZD1 is the second output of described clamper bleeder circuit and the other end ground connection simultaneously of described electric capacity C2;
Described first driving chip has the 3rd transmission ends, and is the data output end of described timing control unit;
Described ON-OFF control circuit comprises:
Resistance R3, resistance R4, second switch pipe, the 3rd switching tube;
One end of described resistance R3 is that the input of described ON-OFF control circuit is connected with the input of described 3rd switching tube, the other end of described resistance R3 is connected with the control end of described 3rd switching tube, the output of described 3rd switching tube is the output of described ON-OFF control circuit, the input of described 3rd switching tube is also connected with one end of described resistance R4, the other end of described resistance R4 is connected with the input of described second switch pipe, the control end of described second switch pipe is the control end of described ON-OFF control circuit, the output head grounding of described second switch pipe.
9. color LED lamp string drive circuit as claimed in claim 7, it is characterized in that, described driving control unit comprises:
Resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, electric capacity C3, voltage stabilizing didoe ZD2, the 4th switching tube, the 5th switching tube and the second driving chip;
One end of described resistance R5 is that the power end of described driving control unit is connected with one end of described resistance R6, the other end of described resistance R5 is connected with the other end of described resistance R6 and the negative electrode of described voltage stabilizing didoe ZD2 simultaneously, the negative electrode of described voltage stabilizing didoe ZD2 is also connected with one end of described resistance R7 and one end of described electric capacity C3 simultaneously, the anode of described voltage stabilizing didoe ZD2, the other end of described resistance R7 and the other end of described electric capacity C3 ground connection simultaneously, the power end of described second driving chip is connected with the negative electrode of described voltage stabilizing didoe ZD2,3rd transmission ends of described second driving chip is the input of described driving control unit, first transmission ends of described second driving chip is connected with the control end of described 4th switching tube and one end of described resistance R10 simultaneously, the output of described 4th switching tube and the other end of described resistance R10 ground connection simultaneously, the input of described 4th switching tube is connected with one end of described resistance R9 and one end of described resistance R8 simultaneously, the other end of described resistance R9 is connected with one end of described resistance R5, the other end of described resistance R8 is the first output of described driving control unit, second transmission ends of described second driving chip is connected with one end of described resistance R13 and the control end of described 5th switching tube simultaneously, the other end of described resistance R13 and the output of described 5th switching tube ground connection simultaneously, the input of described 5th switching tube is connected with one end of described resistance R12 and one end of described resistance R11 simultaneously, the other end of described resistance R12 is connected with one end of described resistance R5, the other end of described resistance R11 is the second output of described driving control unit.
10. a LED string, is characterized in that, described LED string comprises the color LED lamp string drive circuit as described in any one of claim 1 to 9.
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| CN201410374997.7A CN105307315A (en) | 2014-07-31 | 2014-07-31 | Color LED lamp string driving circuit and LED lamp string |
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| CN201410374997.7A CN105307315A (en) | 2014-07-31 | 2014-07-31 | Color LED lamp string driving circuit and LED lamp string |
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