CN105050265A - LED (Light Emitting Diode) multi-group constant-current drive circuit - Google Patents
LED (Light Emitting Diode) multi-group constant-current drive circuit Download PDFInfo
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Abstract
The invention provides an LED (Light Emitting Diode) multi-group constant-current drive circuit, which can be widely applied to the field of LED application. According to the LED multi-group constant-current drive circuit, independent constant-current power supply of multiple groups of LED bead strings can be implemented, the LED bead strings cannot interfere with each other, and LED lamps can be lightened at intervals, so that the junction temperature of the LED bead strings is reduced by more than 20% at work, the light intensity is improved by 1.6 times, the luminous attenuation is reduced, the required radiator area is reduced, and the service life of an LED lamp is prolonged; meanwhile, through changing an input signal of a dimming unit and input data in a data storage unit, the constant current passing through the LED bead strings can be uniformly changed, so that a working mode of the LED bead strings is changed.
Description
Technical field
The invention belongs to LED constant current Driving technique field, be specifically related to a kind of LED many groups constant-current drive circuit realizing many group LED lamp bead string independence constant current-supplyings.
Background technology
LED light source as light source of new generation, just in fast development.LED is a kind of solid-state light emitting semiconductor device, it directly can be converted into light electricity, its have power consumption less, the advantage such as applicability is strong, stability is high, response time short (switching characteristic is good), environmentally safe, multicolor luminous, color developing is good, be the new light sources be worthy to be popularized.
Generally adopting at present concentrates constant current-supplying to carry out driving LED luminescence, and according to the size of LED chip size, the power of single LEDs has 0.1W, 0.2W, 0.5W, 1W etc., expect larger power, LED will be combined use in serial or parallel connection mode.Because LED is that semi-conducting material is made, have certain discrete type, their Vf values can not be consistent, if be all together in series by LED, according to the feature of series circuit, series circuit current is equal, little with the Vf value relation of single LEDs, drive a string LED more satisfactory with a constant-current supply; But the Vf value of single LEDs is about 3V, can not unconfined series connection, therefore when high-power use, have employed a few string several and combination, drive power supply by a constant current.But when there being parallel connection to occur, according to parallel circuits feature, voltage is equal, current summation, and the total Vf value of each branch LED lamp bead string is unequal, the electric current of LED lamp bead string varies, the lamp pearl string that electric current is large can damage because long-time junction temperature is too high, electric current can be added on other lamp pearl strings by constant-current supply, forms vicious circle, shortens the useful life of LED lamp greatly; Peripheral circuit simultaneously needed for existing LED drive chip is complicated, needs more components and parts, thus causes high cost, hinder the Industry Promotion of LED illumination product greatly.
Therefore be badly in need of, for the above-mentioned defect existed in prior art, providing a solution, solve problems of the prior art.
Summary of the invention
The object of the present invention is to provide a kind of realization to organize LED lamp bead string independence constant current-supplying, non-interfering LED many groups constant-current drive circuit between mutual LED lamp bead string more.
The object of the present invention is achieved like this, comprises power subsystem, reference voltage unit, dimming unit, data storage cell, Phaseshift controlling unit and at least one group of LED lamp bead string constant current prosecution unit; Described power subsystem is connected with reference voltage unit respectively with dimming unit, described reference voltage unit is connected with data storage cell, Phaseshift controlling unit and LED lamp bead string constant current prosecution unit respectively, described data storage cell comprises Read-write Catrol end SCL and data input pin SDA, described data input pin SDA is connected with Phaseshift controlling unit, described Phaseshift controlling unit comprises at least one road pulse output signals, and described pulse output signals is connected with LED lamp bead string constant current prosecution unit.
Further, described drive circuit comprises four groups of LED lamp bead string constant current prosecution unit, described Phaseshift controlling unit 5 comprises four tunnel pulse output signals, wherein T1 pulse output signals is connected with the first LED lamp bead string constant current prosecution unit 6, T2 pulse output signals is connected with the second LED lamp bead string constant current prosecution unit 7, T3 pulse output signals is connected with the 3rd LED lamp bead string constant current prosecution unit 8, and T4 pulse output signals is connected with the 4th LED lamp bead string constant current prosecution unit 9.
Compared with prior art, LED many groups constant-current drive circuit provided by the invention can be applied in LED application widely, the independent constant current-supplying to many group LED lamp bead strings can be realized, do not interfere with each other between mutual LED lamp bead string, the gap realizing LED is lighted, and junction temperature when LED lamp bead string is worked reduces by more than 20%, light intensity improves 1.6 times, light decay reduces, and required radiator area reduces, and extends the useful life of LED lamp; Simultaneously by changing the input signal of dimming unit, and the input data changed in data storage cell can be unified to change the continuous current by LED lamp bead string, thus change the working method of LED lamp bead string.
Accompanying drawing explanation
Fig. 1 is the general principles schematic diagram of LED many groups constant-current drive circuit of the present invention;
Fig. 2 is the particular circuit configurations schematic diagram of LED many groups constant-current drive circuit of the present invention;
Fig. 3 is the inside particular circuit configurations schematic diagram of Phaseshift controlling unit in LED many groups constant-current drive circuit of the present invention;
Fig. 4 is the pin schematic diagram after LED many groups constant-current drive circuit of the present invention encapsulation;
Fig. 5 is the embody rule schematic diagram of LED many groups constant-current drive circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, but must not be limited the present invention by any way, and any change done based on training centre of the present invention or improvement, all belong to protection scope of the present invention.
Fig. 1 gives the schematic diagram of LED many groups constant-current drive circuit of the present invention, in the present invention, described LED many groups constant-current drive circuit comprises power subsystem 1, reference voltage unit 2, dimming unit 3, data storage cell 4, Phaseshift controlling unit 5 and at least one group of LED lamp bead string constant current prosecution unit; Described power subsystem 1 is connected with reference voltage unit 2 respectively with dimming unit 3, described reference voltage unit 2 is connected with data storage cell 4, Phaseshift controlling unit 5 and LED lamp bead string constant current prosecution unit respectively, described data storage cell 4 comprises Read-write Catrol end SCL and data input pin SDA, described data input pin SDA is connected with Phaseshift controlling unit 5, described Phaseshift controlling unit 5 comprises at least one road pulse output signals, and described pulse output signals is connected with LED lamp bead string constant current prosecution unit.
Described LED many groups constant-current drive circuit comprises four groups of LED lamp bead string constant current prosecution unit, described Phaseshift controlling unit 5 comprises four tunnel pulse output signals, wherein T1 pulse output signals is connected with the first LED lamp bead string constant current prosecution unit 6, T2 pulse output signals is connected with the second LED lamp bead string constant current prosecution unit 7, T3 pulse output signals is connected with the 3rd LED lamp bead string constant current prosecution unit 8, and T4 pulse output signals is connected with the 4th LED lamp bead string constant current prosecution unit 9.
Fig. 2 is the particular circuit configurations schematic diagram of LED many groups constant-current drive circuit of the present invention, according to Fig. 2, the particular circuit configurations of described drive circuit is: one end of resistance R2 is connected with power supply Vin, the other end of described resistance R2 respectively with the negative electrode of diode D1, the emitter of PNP type triode Q1, one end of resistance R14 and one end of resistance R7 are connected, the plus earth of described diode D1, the other end of described resistance R7 respectively with the negative electrode of diode D2, the VDD pin of pin-saving chip U1 is connected with the VDD pin of Phaseshift controlling chip U2, the anode of described diode D2, the A0 pin of described pin-saving chip U1, A1 pin, A2 pin, WP pin, the R pin of GND pin and described Phaseshift controlling chip U2 and the equal ground connection of GND pin, the external read-write control signal of Read-write Catrol pin SCL of described pin-saving chip U1, the data-out pin SDA external data input signal of described pin-saving chip U1, and be connected to the CK pin of Phaseshift controlling chip U2, the T1 pin of described Phaseshift controlling chip U2 is connected with the base stage of NPN type triode Q3, the T2 pin of described Phaseshift controlling chip U2 is connected with the base stage of NPN type triode Q4, the T3 pin of Phaseshift controlling chip U2 is connected with the base stage of NPN type triode Q5, and the T4 pin of Phaseshift controlling chip U2 is connected with the base stage of NPN type triode Q6, the other end of described resistance R14 is connected with dimming input signal PWM with the base stage of NPN type triode Q2 respectively, be connected with the base stage of described PNP type triode Q1 after the collector electrode contact resistance R1 of described NPN type triode Q2, the collector electrode of described PNP type triode Q1 respectively with resistance R8, resistance R13, one end of resistance R19 and resistance R24 is connected, the other end of described resistance R8 is connected with the negative input end of comparison amplifier IC1 with one end of resistance R9 respectively, the other end of described resistance R13 is connected with the negative input end of comparison amplifier IC2 with one end of resistance R15 respectively, the other end of described resistance R19 is connected with the negative input end of comparison amplifier IC3 with one end of resistance R20 respectively, the other end of described resistance R24 is connected with the negative input end of comparison amplifier IC4 with one end of resistance R25 respectively, the positive input terminal of described comparison amplifier IC1 is connected with one end of resistance R12 with the source electrode of MOS switching tube Q7 respectively, the positive input terminal of described comparison amplifier IC2 is connected with one end of resistance R18 with the source electrode of MOS switching tube Q8 respectively, the positive input terminal of described comparison amplifier IC3 is connected with one end of resistance R23 with the source electrode of MOS switching tube Q9 respectively, and the positive input terminal of described comparison amplifier IC4 is connected with one end of resistance R28 with the source electrode of MOS switching tube Q10 respectively, the output of described comparison amplifier IC1 is connected with one end of resistance R11, the other end of described resistance R11 is connected with the collector electrode of NPN type triode Q3 with the grid of MOS switching tube Q7 respectively, the output of described comparison amplifier IC2 is connected with one end of resistance R17, the other end of described resistance R17 is connected with the collector electrode of NPN type triode Q4 with the grid of MOS switching tube Q8 respectively, the output of described comparison amplifier IC3 is connected with one end of resistance R22, the other end of described resistance R22 is connected with the collector electrode of NPN type triode Q5 with the grid of MOS switching tube Q9 respectively, the output of described comparison amplifier IC4 is connected with one end of resistance R27, the other end of described resistance R27 is connected with the collector electrode of NPN type triode Q6 with the grid of MOS switching tube Q10 respectively, the other end of the other end of the emitter of the emitter of described NPN type triode Q2, the other end of resistance R9, NPN type triode Q3, the other end of resistance R12, resistance R15, the emitter of NPN type triode Q4, resistance R18, the other end of resistance R20, the emitter of NPN type triode Q5, the other end of resistance R23, the other end of resistance R25, the emitter of NPN type triode Q6, the other end ground connection of resistance R28, described power supply Vin respectively with the positive input terminal of comparison amplifier IC5, the positive input terminal of comparison amplifier IC6, the positive input terminal of comparison amplifier IC7, the positive input terminal of comparison amplifier IC8 is connected, be connected with the negative input end of comparison amplifier IC1 after the output series resistor R10 of described comparison amplifier IC5, be connected with the negative input end of comparison amplifier IC2 after the output series resistor R16 of described comparison amplifier IC6, be connected with the negative input end of comparison amplifier IC3 after the output series resistor R21 of described comparison amplifier IC7, be connected with the negative input end of comparison amplifier IC4 after the output series resistor R26 of described comparison amplifier IC8, external LED lamp bead string is respectively used between the negative input end of described comparison amplifier IC5 and the drain electrode of described MOS switching tube Q7, between the negative input end of described comparison amplifier IC6 and the drain electrode of described MOS switching tube Q8, between the negative input end of described comparison amplifier IC7 and the drain electrode of described MOS switching tube Q9 and between the negative input end of described comparison amplifier IC8 and the drain electrode of described MOS switching tube Q10.
Fig. 3 is the inside particular circuit configurations schematic diagram of Phaseshift controlling unit in LED many groups constant-current drive circuit of the present invention, the particular circuit configurations of described Phaseshift controlling chip U2 inside comprises 14 binary system serial counter IC9, Johnson counter IC10, two input Schmidt trigger IC11, IC12, switching diode D3, slide rheostat RW1, resistance R29, resistance R30, resistance R31, electric capacity C4, electric capacity C5 and double D trigger IC13 ~ IC24; The RST pin ground connection of described 14 binary system serial counter IC9, and the RST pin of described 14 binary system serial counter IC9 is the R pin of Phaseshift controlling chip U2; One end of the CIN pin contact resistance R29 of described 14 binary system serial counter IC9, the COUT pin of described 14 binary system serial counter IC9 connects one end of electric capacity C4, described 14 binary system serial counter IC9's
one end of pin contact resistance R30, the other end of described resistance R29 and the other end of electric capacity C4, and the other end of resistance R30 is connected, the Q4 pin of described 14 binary system serial counter IC9 is connected with the clock pins CK of double D trigger IC13 ~ IC24 respectively, and the Q7 pin of described 14 binary system serial counter IC9 is connected with the CLK pin of Johnson counter IC10;
Described Johnson counter IC10's
pin is connected with the Q5 pin of Johnson counter IC10, the RST pin ground connection of described Johnson counter IC10, the Q0 pin of described Johnson counter IC10 is connected with second input pin of two input Schmidt trigger IC11, and first input pin of described two input Schmidt trigger IC11 is the CK pin of Phaseshift controlling chip U2;
The negative pole of the output pin connecting valve diode D3 of described two input Schmidt trigger IC11, the positive pole of described switching diode D3 is connected with the second input pin with first input pin of two input Schmidt trigger IC12, ground connection after the positive pole serial capacitance C5 of simultaneously described switching diode D3, one end of described slide rheostat RW1 is connected with power vd D, is connected after the other end series resistor R31 of described slide rheostat RW1 with the positive pole of switching diode D3;
The output pin of described two input Schmidt trigger IC12 is the T1 pin of Phaseshift controlling chip U2, and be connected with the data-out pin D of double D trigger IC13, the equal ground connection of set pin S of described double D trigger IC13 ~ IC24, the equal ground connection of reset pin R of described double D trigger IC13 ~ IC23, the true form output pin Q of described double D trigger IC13 is connected with the data-out pin D of double D trigger IC14, the true form output pin Q of described double D trigger IC14 is connected with the data-out pin D of double D trigger IC15, the true form output pin Q of described double D trigger IC15 is connected with the data-out pin D of double D trigger IC16, the true form output pin Q of described double D trigger IC16 is the T2 pin of Phaseshift controlling chip U2, and be connected with the data-out pin D of double D trigger IC17, the true form output pin Q of described double D trigger IC17 is connected with the data-out pin D of double D trigger IC18, the true form output pin Q of described double D trigger IC18 is connected with the data-out pin D of double D trigger IC19, the true form output pin Q of described double D trigger IC19 is connected with the data-out pin D of double D trigger IC20, the true form output pin Q of described double D trigger IC20 is the T3 pin of Phaseshift controlling chip U2, and be connected with the data-out pin D of double D trigger IC21, the true form output pin Q of described double D trigger IC21 is connected with the data-out pin D of double D trigger IC22, the true form output pin Q of described double D trigger IC22 is connected with the data-out pin D of double D trigger IC23, the true form output pin Q of described double D trigger IC23 is connected with the data-out pin D of double D trigger IC24, and the true form output pin Q of described double D trigger IC24 is the T4 pin of Phaseshift controlling chip U2.
Fig. 4 is the pin schematic diagram after LED many groups constant-current drive circuit of the present invention encapsulation, according to Fig. 4, described LED many groups constant-current drive circuit is packaged in quadrangle packaging body and forms driving chip, the pin of described driving chip is symmetricly set in two long limits of driving chip, described pin is 16, specifically comprises DE pin, D1+ pin, D2+ pin, D1-pin, D3+ pin, GND pin, PGND pin, D2-pin, D3-pin, D4-pin, DC pin, PWM pin, D4+ pin, SDA pin, SCL pin, Vin pin, described DE pin is used for external internal electric source decoupling capacitance, between described D1+ pin and D1-pin, between described D2+ pin and D2-pin, external LED lamp bead string is respectively used between described D3+ pin and D3-pin and between described D4+ pin and D4-pin, described GND pin is used for digital grounding, described PGND pin is used for power ground connection, described DC pin is used for external weakening electric capacity, described PWM pin is used for external dim signal, described SDA pin is for inputting data, described SCL pin is used for data read-write control, described Vin pin is used for input power.
Fig. 5 is the embody rule schematic diagram of LED many groups constant-current drive circuit of the present invention, according to Fig. 5, the external 24v D.C. regulated power supply of Vin pin of described LED many groups constant-current drive circuit chip, described Vin pin, DE pin, DC pin is external capacitor C3 respectively, electric capacity C2, be connected with PGND pin with GND pin after electric capacity C1, the external dim signal of described PWM pin, described SDA pin external data input signal, described SCL pin external data read-write control signal, outer meeting resistance R3 between described D1+ pin and Vin pin, external LED lamp bead string DL1 between described D1+ pin and D1-pin, outer meeting resistance R4 between described D2+ pin and Vin pin, external LED lamp bead string DL2 between described D2+ pin and D2-pin,
Outer meeting resistance R5 between described D3+ pin and Vin pin, external LED lamp bead string DL3, outer meeting resistance R6 between described D4+ pin and Vin pin between described D3+ pin and D3-pin, external LED lamp bead string DL4 between described D4+ pin and D4-pin.
the operation principle of described LED many groups constant-current drive circuit is:
Vin pin input 24V DC power supply, portion voltage is directly added on the positive terminal of LED lamp bead string DL1, DL2, DL3, DL4 by peripheral resistance R3, R4, R5, R6, the negative pole end of LED lamp bead string DL1, DL2, DL3, DL4 is connected with the drain electrode of MOS switching tube Q7, Q8, Q9, Q10 respectively, when Q7, Q8, Q9, Q10 conducting of MOS switching tube, LED lamp bead string DL1, DL2, DL3, DL4 correspondence is lighted; When MOS switching tube switching tube Q7, Q8, Q9, Q10 end, LED lamp bead string DL1, DL2, DL3, DL4 correspondence is extinguished.Another part voltage provides reference voltage unit by the VCC voltage producing 12V after resistance R2, diode D1, then is supplied to digital storage unit and Phaseshift controlling unit through the vdd voltage of resistance R7, diode D2 generation 5V.
PNP type triode Q1, NPN type triode Q2, resistance R1 and R14 form reference voltage unit, reference voltage unit be respectively comparison amplifier IC1, comparison amplifier IC2, comparison amplifier IC3, comparison amplifier IC4 negative input end voltage is provided, when PWM pin does not have pwm signal to input, NPN type triode Q2 base stage high potential, the collector electrode of PNP type triode Q1 has burning voltage to export, when PWM pin has pwm signal, the base voltage of NPN type triode Q2 can be controlled, change along with PWM input signal is produced corresponding change by the collector voltage of PNP type triode Q1, comparison amplifier IC1, comparison amplifier IC2, comparison amplifier IC3, the negative input end voltage of comparison amplifier IC4 also changes thereupon, comparison amplifier IC1, comparison amplifier IC2, comparison amplifier IC3, the output voltage of comparison amplifier IC4 also correspondence changes.
Pin-saving chip U1 is serial electrically-erasable memory, can repeatedly write data from Read-write Catrol end SCL and data input pin SDA and preserve data; After energising, by data input pin SDA outputting data signals, carry out data processing and phase assignments through Phaseshift controlling chip U2, control the opening and closing of triode NPN type triode Q3, NPN type triode Q4, NPN type triode Q5, NPN type triode Q6 respectively.When pin-saving chip U1 does not have data to export, the T1 pulse output signals of Phaseshift controlling chip U2, T2 pulse output signals, T3 pulse output signals, T4 pulse output signals are high potential, NPN type triode Q3, NPN type triode Q4, NPN type triode Q5, NPN type triode Q6 saturation conduction, the grid potential of MOS switching tube Q7, MOS switching tube Q8, MOS switching tube Q9, MOS switching tube Q10 declines and ends, and LED lamp bead string DL1, DL2, DL3, DL4 do not have electric current pass through and do not work; When pin-saving chip U1 has data to export, the current potential that the T1 pulse output signals of Phaseshift controlling chip U2, T2 pulse output signals, T3 pulse output signals, T4 pulse output signals export changes by pin-saving chip U1 exports the control of data, and the grid potential of MOS switching tube Q7, MOS switching tube Q8, MOS switching tube Q9, MOS switching tube Q10 also changes with the change of pin-saving chip U1 data.
Resistance R3, comparison amplifier IC5, resistance R10, comparison amplifier IC1, resistance R11, MOS switching tube Q7, resistance R12 constitute the constant current prosecution unit to LED lamp bead string DL1.When the lamp pearl number change of LED lamp bead string DL1 lamp pearl string series connection, the total forward voltage Vf value being added in LED lamp bead string DL1 two ends changes, such as the lamp pearl quantity of DL1 lamp pearl string series connection reduces, the total forward voltage Vf value being added in LED lamp bead string DL1 two ends reduces, the electric current flowing through resistance R3 increases, voltage drop on resistance R3 increases, the output voltage of comparison amplifier IC5 rises, the negative input end voltage rise of comparison amplifier IC1, the output voltage of comparison amplifier IC1 is caused to decline, the MOS switching tube Q7 grid voltage be connected with resistance R11 declines, MOS switching tube Q7 drain-source electrode current reduces, reduce the electric current flowing through DL1 lamp pearl string, thus reduce the electric current flowing through resistance R3, voltage drop on resistance R3 declines, form a feedback, serve the constant current prosecution effect to DL1 lamp pearl string.As a same reason, if the lamp pearl quantity of DL1 lamp pearl string series connection increases, can by flow through R3 and current boost, voltage drop on resistance R3 is risen.
Resistance R4, comparison amplifier IC6, resistance R16, comparison amplifier IC2, resistance R17, MOS switching tube Q8, resistance R18 constitute the constant current prosecution unit to LED lamp bead string DL2; Resistance R5, comparison amplifier IC7, resistance R21, comparison amplifier IC3, resistance R22, MOS switching tube Q9, resistance R23 constitute the constant current prosecution unit to LED lamp bead string DL3; Resistance R6, comparison amplifier IC8, resistance R26, comparison amplifier IC4, resistance R27, MOS switching tube Q10, resistance R28 constitute the constant current prosecution unit to LED lamp bead string DL4; Above-mentioned constant current prosecution unit works alone separately, drives corresponding external LED lamp bead string respectively, does not interfere with each other.
In practice, the encapsulation of LED many groups constant-current drive circuit is made into chip, only needs the electric capacity of simple external elimination parasitic oscillation, reduce the volume of drive circuit greatly, be convenient to promote the use of.
Below by reference to the accompanying drawings the present invention is explained in detail, but the present invention is not limited to described execution mode.Basic ideas of the present invention are to provide a kind of drive circuit realizing many group LED lamp bead string independence constant current-supplyings, make not interfereing with each other between string and string of LED lamp bead string in parallel, and realize the interval luminous of LED, reduce LED junction temperature, extend the useful life of LED lamp; The driving chip of LED many groups constant-current drive circuit and the encapsulation formation that can realize 4 groups of lamp pearl string independence constant current-supplyings is only shown in execution mode provided by the invention, but for the person of ordinary skill of the art, according to instruction of the present invention, designing the constant current driver circuit for LED that can realize more than 4 groups does not need performing creative labour.Therefore the change carried out these execution modes in the case of without departing from the principles of the present invention, amendment, replacement and modification still fall within the scope of protection of the present invention.
Claims (5)
1.LED many groups constant-current drive circuit, comprises power subsystem (1), reference voltage unit (2), dimming unit (3), data storage cell (4), Phaseshift controlling unit (5) and at least one group of LED lamp bead string constant current prosecution unit, it is characterized in that: described power subsystem (1) is connected with reference voltage unit (2) respectively with dimming unit (3), described reference voltage unit (2) respectively with data storage cell (4), Phaseshift controlling unit (5) and LED lamp bead string constant current prosecution unit are connected, described data storage cell (4) comprises Read-write Catrol end SCL and data input pin SDA, described data input pin SDA is connected with Phaseshift controlling unit (5), described Phaseshift controlling unit (5) comprises at least one road pulse output signals, described pulse output signals is connected with LED lamp bead string constant current prosecution unit.
2. LED many groups constant-current drive circuit according to claim 1, it is characterized in that: described LED many groups constant-current drive circuit comprises four groups of LED lamp bead string constant current prosecution unit, described Phaseshift controlling unit (5) comprises four tunnel pulse output signals, wherein T1 pulse output signals is connected with the first LED lamp bead string constant current prosecution unit (6), T2 pulse output signals is connected with the second LED lamp bead string constant current prosecution unit (7), T3 pulse output signals is connected with the 3rd LED lamp bead string constant current prosecution unit (8), T4 pulse output signals is connected with the 4th LED lamp bead string constant current prosecution unit (9).
3. LED many groups constant-current drive circuit according to claim 2, it is characterized in that: the particular circuit configurations of described LED many groups constant-current drive circuit is: one end of resistance R2 is connected with power supply Vin, the other end of described resistance R2 respectively with the negative electrode of diode D1, the emitter of PNP type triode Q1, one end of resistance R14 and one end of resistance R7 are connected, the plus earth of described diode D1, the other end of described resistance R7 respectively with the negative electrode of diode D2, the VDD pin of pin-saving chip U1 is connected with the VDD pin of Phaseshift controlling chip U2, the anode of described diode D2, the A0 pin of described pin-saving chip U1, A1 pin, A2 pin, WP pin, the R pin of GND pin and described Phaseshift controlling chip U2 and the equal ground connection of GND pin, the external read-write control signal of Read-write Catrol pin SCL of described pin-saving chip U1, the data-out pin SDA external data input signal of described pin-saving chip U1, and be connected to the CK pin of Phaseshift controlling chip U2, the T1 pin of described Phaseshift controlling chip U2 is connected with the base stage of NPN type triode Q3, the T2 pin of described Phaseshift controlling chip U2 is connected with the base stage of NPN type triode Q4, the T3 pin of Phaseshift controlling chip U2 is connected with the base stage of NPN type triode Q5, and the T4 pin of Phaseshift controlling chip U2 is connected with the base stage of NPN type triode Q6, the other end of described resistance R14 is connected with dimming input signal PWM with the base stage of NPN type triode Q2 respectively, be connected with the base stage of described PNP type triode Q1 after the collector electrode contact resistance R1 of described NPN type triode Q2, the collector electrode of described PNP type triode Q1 respectively with resistance R8, resistance R13, one end of resistance R19 and resistance R24 is connected, the other end of described resistance R8 is connected with the negative input end of comparison amplifier IC1 with one end of resistance R9 respectively, the other end of described resistance R13 is connected with the negative input end of comparison amplifier IC2 with one end of resistance R15 respectively, the other end of described resistance R19 is connected with the negative input end of comparison amplifier IC3 with one end of resistance R20 respectively, the other end of described resistance R24 is connected with the negative input end of comparison amplifier IC4 with one end of resistance R25 respectively, the positive input terminal of described comparison amplifier IC1 is connected with one end of resistance R12 with the source electrode of MOS switching tube Q7 respectively, the positive input terminal of described comparison amplifier IC2 is connected with one end of resistance R18 with the source electrode of MOS switching tube Q8 respectively, the positive input terminal of described comparison amplifier IC3 is connected with one end of resistance R23 with the source electrode of MOS switching tube Q9 respectively, and the positive input terminal of described comparison amplifier IC4 is connected with one end of resistance R28 with the source electrode of MOS switching tube Q10 respectively, the output of described comparison amplifier IC1 is connected with one end of resistance R11, the other end of described resistance R11 is connected with the collector electrode of NPN type triode Q3 with the grid of MOS switching tube Q7 respectively, the output of described comparison amplifier IC2 is connected with one end of resistance R17, the other end of described resistance R17 is connected with the collector electrode of NPN type triode Q4 with the grid of MOS switching tube Q8 respectively, the output of described comparison amplifier IC3 is connected with one end of resistance R22, the other end of described resistance R22 is connected with the collector electrode of NPN type triode Q5 with the grid of MOS switching tube Q9 respectively, the output of described comparison amplifier IC4 is connected with one end of resistance R27, the other end of described resistance R27 is connected with the collector electrode of NPN type triode Q6 with the grid of MOS switching tube Q10 respectively, the other end of the other end of the emitter of the emitter of described NPN type triode Q2, the other end of resistance R9, NPN type triode Q3, the other end of resistance R12, resistance R15, the emitter of NPN type triode Q4, resistance R18, the other end of resistance R20, the emitter of NPN type triode Q5, the other end of resistance R23, the other end of resistance R25, the emitter of NPN type triode Q6, the other end ground connection of resistance R28, described power supply Vin respectively with the positive input terminal of comparison amplifier IC5, the positive input terminal of comparison amplifier IC6, the positive input terminal of comparison amplifier IC7, the positive input terminal of comparison amplifier IC8 is connected, be connected with the negative input end of comparison amplifier IC1 after the output series resistor R10 of described comparison amplifier IC5, be connected with the negative input end of comparison amplifier IC2 after the output series resistor R16 of described comparison amplifier IC6, be connected with the negative input end of comparison amplifier IC3 after the output series resistor R21 of described comparison amplifier IC7, be connected with the negative input end of comparison amplifier IC4 after the output series resistor R26 of described comparison amplifier IC8, external LED lamp bead string is respectively used between the negative input end of described comparison amplifier IC5 and the drain electrode of described MOS switching tube Q7, between the negative input end of described comparison amplifier IC6 and the drain electrode of described MOS switching tube Q8, between the negative input end of described comparison amplifier IC7 and the drain electrode of described MOS switching tube Q9 and between the negative input end of described comparison amplifier IC8 and the drain electrode of described MOS switching tube Q10.
4. LED many groups constant-current drive circuit according to claim 3, it is characterized in that: the particular circuit configurations of described Phaseshift controlling chip U2 inside comprises 14 binary system serial counter IC9, Johnson counter IC10, two input Schmidt trigger IC11, IC12, switching diode D3, slide rheostat RW1, resistance R29, resistance R30, resistance R31, electric capacity C4, electric capacity C5 and double D trigger IC13 ~ IC24; The RST pin ground connection of described 14 binary system serial counter IC9, and the RST pin of described 14 binary system serial counter IC9 is the R pin of Phaseshift controlling chip U2; One end of the CIN pin contact resistance R29 of described 14 binary system serial counter IC9, the COUT pin of described 14 binary system serial counter IC9 connects one end of electric capacity C4, described 14 binary system serial counter IC9's
one end of pin contact resistance R30, the other end of described resistance R29 and the other end of electric capacity C4, and the other end of resistance R30 is connected, the Q4 pin of described 14 binary system serial counter IC9 is connected with the clock pins CK of double D trigger IC13 ~ IC24 respectively, and the Q7 pin of described 14 binary system serial counter IC9 is connected with the CLK pin of Johnson counter IC10;
Described Johnson counter IC10's
pin is connected with the Q5 pin of Johnson counter IC10, the RST pin ground connection of described Johnson counter IC10, the Q0 pin of described Johnson counter IC10 is connected with second input pin of two input Schmidt trigger IC11, and first input pin of described two input Schmidt trigger IC11 is the CK pin of Phaseshift controlling chip U2;
The negative pole of the output pin connecting valve diode D3 of described two input Schmidt trigger IC11, the positive pole of described switching diode D3 is connected with the second input pin with first input pin of two input Schmidt trigger IC12, ground connection after the positive pole serial capacitance C5 of simultaneously described switching diode D3, one end of described slide rheostat RW1 is connected with power vd D, is connected after the other end series resistor R31 of described slide rheostat RW1 with the positive pole of switching diode D3;
The output pin of described two input Schmidt trigger IC12 produces T1 pulse output signals, and be connected with the data-out pin D of double D trigger IC13, the equal ground connection of set pin S of described double D trigger IC13 ~ IC24, the equal ground connection of reset pin R of described double D trigger IC13 ~ IC23, the true form output pin Q of described double D trigger IC13 is connected with the data-out pin D of double D trigger IC14, the true form output pin Q of described double D trigger IC14 is connected with the data-out pin D of double D trigger IC15, the true form output pin Q of described double D trigger IC15 is connected with the data-out pin D of double D trigger IC16, the true form output pin Q of described double D trigger IC16 produces T2 pulse output signals, and be connected with the data-out pin D of double D trigger IC17, the true form output pin Q of described double D trigger IC17 is connected with the data-out pin D of double D trigger IC18, the true form output pin Q of described double D trigger IC18 is connected with the data-out pin D of double D trigger IC19, the true form output pin Q of described double D trigger IC19 is connected with the data-out pin D of double D trigger IC20, the true form output pin Q of described double D trigger IC20 produces T3 pulse output signals, and be connected with the data-out pin D of double D trigger IC21, the true form output pin Q of described double D trigger IC21 is connected with the data-out pin D of double D trigger IC22, the true form output pin Q of described double D trigger IC22 is connected with the data-out pin D of double D trigger IC23, the true form output pin Q of described double D trigger IC23 is connected with the data-out pin D of double D trigger IC24, and the true form output pin Q of described double D trigger IC24 produces T4 pulse output signals.
5. the LED many groups constant-current drive circuit according to Claims 2 or 3, it is characterized in that: described LED many groups constant-current drive circuit is packaged in quadrangle packaging body and forms driving chip, the pin of described driving chip is symmetricly set in two long limits of driving chip, described pin is 16, specifically comprises DE pin, D1+ pin, D2+ pin, D1-pin, D3+ pin, GND pin, PGND pin, D2-pin, D3-pin, D4-pin, DC pin, PWM pin, D4+ pin, SDA pin, SCL pin, Vin pin, described DE pin is used for external internal electric source decoupling capacitance, between described D1+ pin and D1-pin, between described D2+ pin and D2-pin, external LED lamp bead string is respectively used between described D3+ pin and D3-pin and between described D4+ pin and D4-pin, described GND pin is used for digital grounding, described PGND pin is used for power ground connection, described DC pin is used for external weakening electric capacity, described PWM pin is used for external dim signal, described SDA pin is for inputting data, described SCL pin is used for data read-write control, described Vin pin is used for input power.
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