CN105050265B - The multigroup constant-current drive circuits of LED - Google Patents
The multigroup constant-current drive circuits of LED Download PDFInfo
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- CN105050265B CN105050265B CN201510419560.5A CN201510419560A CN105050265B CN 105050265 B CN105050265 B CN 105050265B CN 201510419560 A CN201510419560 A CN 201510419560A CN 105050265 B CN105050265 B CN 105050265B
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Abstract
The multigroup constant-current drive circuits of LED that the present invention is provided can be widely applied in LED application fields, the independent constant current-supplying to multigroup LED bead string can be realized, it is not interfere with each other between LED bead string, realize that the gap of LED is lighted, so that the junction temperature reduction by more than 20% during the work of LED bead string, light intensity improves 1.6 times, light decay reduces, required radiator area reduces, and extends the service life of LED lamp；Simultaneously by changing the input signal of dimming unit, and the input data in change data memory cell can be unified to change the continuous current by LED bead string, so as to change the working method of LED bead string.
Description
Technical field
The invention belongs to LED constant current actuation techniques field, and in particular to one kind realizes that multigroup LED bead string independence constant current is supplied
The multigroup constant-current drive circuits of LED of electricity.
Background technology
LED light sources are as light source of new generation, just in fast development.LED is a kind of light emitting semiconductor device of solid-state, it
Electricity directly can be converted into light, its have power consumption less, strong applicability, stability is high, the response time is short（Switching characteristic is good）, it is right
The advantages of environmental nonpollution, good multicolor luminous, color developing, be the new light sources being worthy to be popularized.
Generally LED is driven to light using constant current-supplying is concentrated at present, according to the size of LED core chip size, single LEDs
Power has 0.1W, 0.2W, 0.5W, 1W etc., to expect bigger power to combine LED in series or in parallel
To use.Because LED is that semi-conducting material is made, with certain discrete type, their Vf values can not possibly be consistent, if will
LED is all together in series, and according to the characteristics of series circuit, series circuit current is equal, and the Vf values relation with single LEDs is little,
Drive a string of LED more satisfactory with a constant-current supply；However, the Vf values of single LEDs are 3V or so, it is impossible to unconfined string
Connection, therefore in the case of high-power use, employ several strings it is several and combination, powered by a constant current driving.But
When there is parallel connection to occur, according to parallel circuit feature, voltage is equal, and electric current is added, and the total Vf values of each branch's LED bead string are not
Equal, the electric current of LED bead string is varied, and the big lamp bead string of electric current can be damaged because long-time junction temperature is too high, constant-current supply meeting
Electric current is added on other lamp bead strings, vicious circle is formed, greatly shortens the service life of LED lamp；It is simultaneously existing
Peripheral circuit needed for LED drive chip is complicated, it is necessary to which more component, so as to cause cost too high, is greatly hindered
The Industry Promotion of LED illumination product.
Therefore it is badly in need of for drawbacks described above present in prior art there is provided a solution, solves in the prior art
The problem of existing.
The content of the invention
Realize multigroup LED bead string independence constant current-supplying it is an object of the invention to provide one kind, mutual LED bead string it
Between the non-interfering multigroup constant-current drive circuits of LED.
The object of the present invention is achieved like this, and the particular circuit configurations of the drive circuit are：Resistance R2 one end with
Power supply Vin is connected, negative electrode, PNP type triode Q1 emitter stage, the electricity of the other end of the resistance R2 respectively with diode D1
Hinder R14 one end and resistance R7 one end to be connected, the plus earth of the diode D1, the other end point of the resistance R7
The VDD pins of negative electrode, pin-saving chip U1 not with diode D2 and Phaseshift controlling chip U2 VDD pins are connected, institute
State diode D2 anode, the A0 pins of the pin-saving chip U1, A1 pins, A2 pins, WP pins, GND pin and
The R pins and GND pin of the Phaseshift controlling chip U2 is grounded；The Read-write Catrol pin of the pin-saving chip U1
The external read-write control signals of SCL, the data-out pin SDA external data input signals of the pin-saving chip U1, and even
It is connected to Phaseshift controlling chip U2 CK pins；The base stage phase of the T1 pins and NPN type triode Q3 of the Phaseshift controlling chip U2
Connection, the T2 pins of the Phaseshift controlling chip U2 are connected with NPN type triode Q4 base stage, Phaseshift controlling chip U2 T3
Pin is connected with NPN type triode Q5 base stage, Phaseshift controlling chip U2 T4 pins and NPN type triode Q6 base stage phase
Connection；The other end of the resistance R14 is connected with NPN type triode Q2 base stage and dimming input signal PWM respectively, described
It is connected after NPN type triode Q2 colelctor electrode connection resistance R1 with the base stage of the PNP type triode Q1, the positive-negative-positive three
The one end of pole pipe Q1 colelctor electrode respectively with resistance R8, resistance R13, resistance R19 and resistance R24 is connected, the resistance R8
The other end be connected respectively with resistance R9 one end and comparison amplifier IC1 negative input end, the other end of the resistance R13
Be connected respectively with resistance R15 one end and comparison amplifier IC2 negative input end, the other end of the resistance R19 respectively with
Resistance R20 one end is connected with comparison amplifier IC3 negative input end, the other end of the resistance R24 respectively with resistance R25
One end be connected with comparison amplifier IC4 negative input end；The positive input terminal of the comparison amplifier IC1 is opened with MOS respectively
The source electrode for closing pipe Q7 is connected with resistance R12 one end, the positive input terminal of the comparison amplifier IC2 respectively with MOS switch pipe
Q8 source electrode is connected with resistance R18 one end, and the positive input terminal of the comparison amplifier IC3 is respectively with MOS switch pipe Q9's
Source electrode is connected with resistance R23 one end, the source electrode of the positive input terminal of the comparison amplifier IC4 respectively with MOS switch pipe Q10
It is connected with resistance R28 one end；The output end of the comparison amplifier IC1 is connected with resistance R11 one end, the resistance
The R11 other end is connected with MOS switch pipe Q7 grid and NPN type triode Q3 colelctor electrode respectively, described to compare amplification
Device IC2 output end is connected with resistance R17 one end, the grid of the other end of the resistance R17 respectively with MOS switch pipe Q8
It is connected with NPN type triode Q4 colelctor electrode, the output end of the comparison amplifier IC3 is connected with resistance R22 one end,
The other end of the resistance R22 is connected with MOS switch pipe Q9 grid and NPN type triode Q5 colelctor electrode respectively, described
Comparison amplifier IC4 output end is connected with resistance R27 one end, the other end of the resistance R27 respectively with MOS switch pipe
Q10 grid is connected with NPN type triode Q6 colelctor electrode；The emitter stage of the NPN type triode Q2, resistance R9 it is another
End, NPN type triode Q3 emitter stage, the resistance R12 other end, the resistance R15 other end, NPN type triode Q4 transmitting
Pole, the resistance R18 other end, the resistance R20 other end, NPN type triode Q5 emitter stage, the resistance R23 other end, resistance
The R25 other end, NPN type triode Q6 emitter stage, resistance R28 other end ground connection；The power supply Vin is put with being compared respectively
Big device IC5 positive input terminal, comparison amplifier IC6 positive input terminal, comparison amplifier IC7 positive input terminal, comparison amplifier
IC8 positive input terminal is connected, negative with comparison amplifier IC1 after the output end series resistor R10 of the comparison amplifier IC5
Input is connected, the negative input end after the output end series resistor R16 of the comparison amplifier IC6 with comparison amplifier IC2
It is connected, is connected after the output end series resistor R21 of the comparison amplifier IC7 with comparison amplifier IC3 negative input end,
It is connected after the output end series resistor R26 of the comparison amplifier IC8 with comparison amplifier IC4 negative input end；The ratio
Negative input end compared with amplifier IC5 and between the drain electrode of the MOS switch pipe Q7, the negative input end of the comparison amplifier IC6
Between drain electrode with the MOS switch pipe Q8, the negative input end of the comparison amplifier IC7 and the MOS switch pipe Q9 leakage
Between pole and the comparison amplifier IC8 negative input end and the MOS switch pipe Q10 drain electrode between be respectively used to it is external
LED bead string.
Compared with prior art, the multigroup constant-current drive circuits of LED that the present invention is provided can be widely applied to LED applications
In field, it can realize and not interfere with each other between the independent constant current-supplying to multigroup LED bead string, LED bead string, realize LED
Gap light so that LED bead string work when junction temperature reduction by more than 20%, light intensity improve 1.6 times, light decay reduce, it is required dissipate
Hot device area reduces, and extends the service life of LED lamp；Simultaneously by changing the input signal of dimming unit, and change number
It can unify to change the continuous current by LED bead string according to the input data in memory cell, so as to change LED bead string
Working method.
Brief description of the drawings
Fig. 1 is the general principles schematic diagram of the multigroup constant-current drive circuits of LED of the present invention；
Fig. 2 is the particular circuit configurations schematic diagram of the multigroup constant-current drive circuits of LED of the present invention；
Fig. 3 is the inside particular circuit configurations schematic diagram of Phaseshift controlling unit in the multigroup constant-current drive circuits of LED of the present invention；
Fig. 4 is the pin schematic diagram after the multigroup constant-current drive circuit encapsulation of LED of the present invention；
Fig. 5 is the concrete application schematic diagram of the multigroup constant-current drive circuits of LED of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, but the present invention must not be limited in any way
System, based on present invention teach that any changes and modifications made, belong to protection scope of the present invention.
Fig. 1 gives the LED of the present invention schematic diagrams of multigroup constant-current drive circuit, in the present invention, the multigroup constant currents of LED
Drive circuit include power subsystem 1, reference voltage unit 2, dimming unit 3, data storage cell 4, Phaseshift controlling unit 5 and
At least one set of LED bead string constant current prosecution unit；The power subsystem 1 and dimming unit 3 are connected with reference voltage unit 2 respectively
Connect, the reference voltage unit 2 respectively with data storage cell 4, Phaseshift controlling unit 5 and LED bead string constant current prosecution list
Member is connected, and the data storage cell 4 includes Read-write Catrol end SCL and data input pin SDA, the data input pin SDA
It is connected with Phaseshift controlling unit 5, the Phaseshift controlling unit 5 includes at least pulse output signals all the way, the pulse output
Signal is connected with LED bead string constant current prosecution unit.
The multigroup constant-current drive circuits of described LED include four groups of LED bead string constant current prosecution units, the Phaseshift controlling list
Member 5 includes four tunnel pulse output signals, and wherein T1 pulse output signals are connected with the first LED bead string constant current prosecution unit 6,
T2 pulse output signals are connected with the second LED bead string constant current prosecution unit 7, T3 pulse output signals and the 3rd LED lamp bead
String constant current prosecution unit 8 is connected, and T4 pulse output signals are connected with the 4th LED bead string constant current prosecution unit 9.
Fig. 2 is the particular circuit configurations schematic diagram of the multigroup constant-current drive circuits of LED of the present invention, described according to Fig. 2
The particular circuit configurations of drive circuit are：Resistance R2 one end is connected with power supply Vin, the other end of the resistance R2 respectively with
Diode D1 negative electrode, PNP type triode Q1 emitter stage, resistance R14 one end and resistance R7 one end are connected, described
Diode D1 plus earth, negative electrode, the pin-saving chip U1 VDD of the other end of the resistance R7 respectively with diode D2
Pin is connected with Phaseshift controlling chip U2 VDD pins, the anode of the diode D2, the A0 of the pin-saving chip U1
Pin, A1 pins, A2 pins, WP pins, GND pin and the Phaseshift controlling chip U2 R pins and GND pin connect
Ground；The external read-write control signals of Read-write Catrol pin SCL of the pin-saving chip U1, the number of the pin-saving chip U1
According to input pin SDA external data input signals, and it is connected to Phaseshift controlling chip U2 CK pins；The Phaseshift controlling chip
U2 T1 pins are connected with NPN type triode Q3 base stage, the T2 pins and NPN type triode of the Phaseshift controlling chip U2
Q4 base stage is connected, and Phaseshift controlling chip U2 T3 pins are connected with NPN type triode Q5 base stage, Phaseshift controlling chip
U2 T4 pins are connected with NPN type triode Q6 base stage；The other end of the resistance R14 respectively with NPN type triode Q2
Base stage be connected with dimming input signal PWM, with the PNP after the colelctor electrode of NPN type triode Q2 connection resistance R1
Type triode Q1 base stage is connected, the colelctor electrode of the PNP type triode Q1 respectively with resistance R8, resistance R13, resistance R19
And resistance R24 one end is connected, the other end of the resistance R8 respectively with resistance R9 one end and comparison amplifier IC1
Negative input end is connected, the other end of resistance R13 one end respectively with resistance R15 and comparison amplifier IC2 negative input
End is connected, and the other end of the resistance R19 is connected with resistance R20 one end and comparison amplifier IC3 negative input end respectively
Connect, the other end of the resistance R24 is connected with resistance R25 one end and comparison amplifier IC4 negative input end respectively；It is described
Comparison amplifier IC1 positive input terminal is connected with MOS switch pipe Q7 source electrode and resistance R12 one end respectively, the comparison
Amplifier IC2 positive input terminal is connected with MOS switch pipe Q8 source electrode and resistance R18 one end respectively, described to compare amplification
Device IC3 positive input terminal is connected with MOS switch pipe Q9 source electrode and resistance R23 one end respectively, the comparison amplifier IC4
Positive input terminal be connected respectively with MOS switch pipe Q10 source electrode and resistance R28 one end；The comparison amplifier IC1's is defeated
Go out end with resistance R11 one end to be connected, the grid and NPN type three of the other end of the resistance R11 respectively with MOS switch pipe Q7
Pole pipe Q3 colelctor electrode is connected, and the output end of the comparison amplifier IC2 is connected with resistance R17 one end, the resistance
The R17 other end is connected with MOS switch pipe Q8 grid and NPN type triode Q4 colelctor electrode respectively, described to compare amplification
Device IC3 output end is connected with resistance R22 one end, the grid of the other end of the resistance R22 respectively with MOS switch pipe Q9
It is connected with NPN type triode Q5 colelctor electrode, the output end of the comparison amplifier IC4 is connected with resistance R27 one end,
The other end of the resistance R27 is connected with MOS switch pipe Q10 grid and NPN type triode Q6 colelctor electrode respectively；It is described
NPN type triode Q2 emitter stage, the resistance R9 other end, NPN type triode Q3 emitter stage, the resistance R12 other end, electricity
The resistance R15 other end, NPN type triode Q4 emitter stage, the resistance R18 other end, the resistance R20 other end, the pole of NPN type three
Pipe Q5 emitter stage, the resistance R23 other end, the resistance R25 other end, NPN type triode Q6 emitter stage, resistance R28
The other end is grounded；Power supply Vin positive input terminals respectively with comparison amplifier IC5, comparison amplifier IC6 positive input terminal,
Comparison amplifier IC7 positive input terminal, comparison amplifier IC8 positive input terminal is connected, the output of the comparison amplifier IC5
It is connected after the series resistor R10 of end with comparison amplifier IC1 negative input end, the output end concatenation of the comparison amplifier IC6
Negative input end after resistance R16 with comparison amplifier IC2 is connected, the output end series resistor R21 of the comparison amplifier IC7
The negative input end with comparison amplifier IC3 is connected afterwards, after the output end series resistor R26 of the comparison amplifier IC8 with than
Negative input end compared with amplifier IC4 is connected；The leakage of the negative input end of the comparison amplifier IC5 and the MOS switch pipe Q7
Between pole, between the negative input end of the comparison amplifier IC6 and the MOS switch pipe Q8 drain electrode, the comparison amplifier
Between IC7 negative input end and the MOS switch pipe Q9 drain electrode and the comparison amplifier IC8 negative input end with it is described
External LED bead string is respectively used between MOS switch pipe Q10 drain electrode.
Fig. 3 is the inside particular circuit configurations schematic diagram of Phaseshift controlling unit in the multigroup constant-current drive circuits of LED of the present invention,
Particular circuit configurations inside the Phaseshift controlling chip U2 include 14 binary system serial counter IC9, Johnson counters
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；14 binary system serial counter IC9's
RST pins are grounded, and the RST pins of 14 binary system serial counter IC9 are Phaseshift controlling chip U2 R pins；Institute
State 14 binary system serial counter IC9 CIN pins connection resistance R29 one end, 14 binary system serial counters
IC9 COUT pins connection electric capacity C4 one end, the pin connection resistance R30's of 14 binary system serial counter IC9
One end, the other end of the resistance R29 and the electric capacity C4 other end, and the resistance R30 other end are connected, described 14 two
Clock pins CK of the system serial counter IC9 Q4 pins respectively with double D trigger IC13 ~ IC24 is connected, described 14
Binary system serial counter IC9 Q7 pins are connected with Johnson counters IC10 CLK pin；
The pin of the Johnson counters IC10 is connected with Johnson counters IC10 Q5 pins, described
Johnson counters IC10 RST pins ground connection, the Q0 pins of the Johnson counters IC10 and two input Schmidts
Trigger IC11 the second input pin is connected, and the first input pin of the two inputs Schmidt trigger IC11 is phase
Move control chip U2 CK pins；
The output pin connecting valve diode D3 of two inputs Schmidt trigger IC11 negative pole, the switch
Diode D3 positive pole is connected with two input Schmidt trigger IC12 the first input pin and the second input pin, together
It is grounded after Shi Suoshu switching diodes D3 positive pole serial capacitance C5, one end of the slide rheostat RW1 is connected with power vd D
Connect, be connected after the other end series resistor R31 of the slide rheostat RW1 with switching diode D3 positive pole；
The output pin of the two inputs Schmidt trigger IC12 is Phaseshift controlling chip U2 T1 pins, and with
Double D trigger IC13 data-out pin D is connected, and the set pin S of the double D trigger IC13 ~ IC24 is grounded, institute
The reset pin R for stating double D trigger IC13 ~ IC23 is grounded, and the true form output pin Q of the double D trigger IC13 is touched with double D
Hair device IC14 data-out pin D is connected, the true form output pin Q and double D trigger IC15 of the double D trigger IC14
Data-out pin D be connected, the true form output pin Q and double D trigger IC16 of the double D trigger IC15 data are defeated
Enter pin D to be connected, the true form output pin Q of the double D trigger IC16 is Phaseshift controlling chip U2 T2 pins, and with
Double D trigger IC17 data-out pin D is connected, and the true form output pin Q of the double D trigger IC17 is triggered with double D
Device IC18 data-out pin D is connected, the true form output pin Q's and double D trigger IC19 of the double D trigger IC18
Data-out pin D is connected, the true form output pin Q and double D trigger IC20 of the double D trigger IC19 data input
Pin D is connected, and the true form output pin Q of the double D trigger IC20 is Phaseshift controlling chip U2 T3 pins, and with it is double
D type flip flop IC21 data-out pin D is connected；The true form output pin Q and double D trigger of the double D trigger IC21
IC22 data-out pin D is connected, the true form output pin Q and double D trigger IC23 of the double D trigger IC22 number
It is connected according to input pin D, the true form output pin Q and double D trigger IC24 of the double D trigger IC23 data input are drawn
Pin D is connected, and the true form output pin Q of the double D trigger IC24 is Phaseshift controlling chip U2 T4 pins.
Fig. 4 is the pin schematic diagram after the multigroup constant-current drive circuit encapsulation of LED of the present invention, described according to Fig. 4
The multigroup constant-current drive circuits of LED, which are packaged in quadrangle packaging body, forms driving chip, and the pin of the driving chip is symmetrically set
Be placed in two long sides of driving chip, the pin is 16, specifically include DE pins, D1+ pins, D2+ pins, D1- pins,
D3+ pins, GND pin, PGND pins, D2- pins, D3- pins, D4- pins, DC pins, PWM pins, D4+ pins, SDA draw
Pin, SCL pins, Vin pins；The DE pins be used for external internal electric source decoupling capacitance, the D1+ pins and D1- pins it
Between, between the D2+ pins and D2- pins, between the D3+ pins and D3- pins and the D4+ pins and D4- pins
Between be respectively used to external LED bead string, the GND pin is used for digital grounding, and the PGND pins are used for power ground connection, institute
Stating DC pins is used for external weakening electric capacity, and the PWM pins are used for external dim signal, and the SDA pins are used for input data,
The SCL pins are used for data read-write control, and the Vin pins are used for input power.
Fig. 5 is the concrete application schematic diagram of the multigroup constant-current drive circuits of LED of the present invention, according to Fig. 5, described LED
The external 24v D.C. regulated power supplies of Vin pins of multigroup constant-current drive circuit chip, the Vin pins, DE pins, DC pins point
It is connected after other external capacitor C3, electric capacity C2, electric capacity C1 with GND pin and PGND pins, the external light modulation letter of PWM pins
Number, the SDA pins external data input signal, the SCL pins external data read-write control signal, the D1+ pins with
Outer meeting resistance R3 between Vin pins, external LED bead string DL1 between the D1+ pins and D1- pins, the D2+ pins with
Outer meeting resistance R4 between Vin pins, external LED bead string DL2 between the D2+ pins and D2- pins,
Outer meeting resistance R5 between the D3+ pins and Vin pins, external LED between the D3+ pins and D3- pins
Bead string DL3, outer meeting resistance R6 between the D4+ pins and Vin pins, external LED between the D4+ pins and D4- pins
Bead string DL4.
The operation principle of the multigroup constant-current drive circuits of LED is：
Vin pins input 24V dc sources, and portion voltage is applied directly to LED lamp bead by peripheral resistance R3, R4, R5, R6
Go here and there on DL1, DL2, DL3, DL4 positive terminal, LED bead string DL1, DL2, DL3, DL4 negative pole end respectively with MOS switch pipe
Q7, Q8, Q9, Q10 drain electrode connection, when MOS switch pipe Q7, Q8, Q9, Q10 are turned on, LED bead string DL1, DL2, DL3, DL4
Correspondence is lighted；When MOS switch pipe Q7, Q8, Q9, Q10 end, LED bead string DL1, DL2, DL3, DL4 correspondence are extinguished.It is another
The VCC voltages that portion voltage produces 12V after resistance R2, diode D1 provide reference voltage unit, then through resistance R7, diode
The vdd voltage that D2 produces 5V is supplied to digital storage unit and Phaseshift controlling unit.
PNP type triode Q1, NPN type triode Q2, resistance R1 and R14 composition reference voltage unit, reference voltage list
Member is respectively comparison amplifier IC1, comparison amplifier IC2, comparison amplifier IC3, comparison amplifier IC4 negative input end offer
Voltage；When PWM pins do not have pwm signal input, NPN type triode Q2 base stage high potentials, PNP type triode Q1 colelctor electrode
There is burning voltage output, when PWM pins have pwm signal, NPN type triode Q2 base voltage can be controlled, positive-negative-positive three
Pole pipe Q1 collector voltage will produce corresponding change with the change of PWM input signals, comparison amplifier IC1, compare
Amplifier IC2, comparison amplifier IC3, comparison amplifier IC4 negative input end voltage also change therewith, comparison amplifier IC1,
Comparison amplifier IC2, comparison amplifier IC3, comparison amplifier IC4 output voltage are also corresponded to and changed.
Pin-saving chip U1 is serial electrically-erasable memory, can be anti-from Read-write Catrol end SCL and data input pin SDA
Make carbon copies into data and preserve data；After energization, by data input pin SDA outputting data signals, carried out through Phaseshift controlling chip U2
Data processing and phase assignments, control respectively triode NPN type triode Q3, NPN type triode Q4, NPN type triode Q5,
NPN type triode Q6 opening and closing.When pin-saving chip U1 does not have data output, Phaseshift controlling chip U2 T1 pulses
Output signal, T2 pulse output signals, T3 pulse output signals, T4 pulse output signals are high potential, the pole of NPN type three
Pipe Q3, NPN type triode Q4, NPN type triode Q5, NPN type triode Q6 saturation conductions, MOS switch pipe Q7, MOS switch pipe
Q8, MOS switch pipe Q9, MOS switch pipe Q10 grid potential decline and ended, and LED bead string DL1, DL2, DL3, DL4 do not have
Electric current by and do not work；When pin-saving chip U1 has data output, Phaseshift controlling chip U2 T1 pulse output signals,
T2 pulse output signals, T3 pulse output signals, the current potential of T4 pulse output signals output are exported by pin-saving chip U1
The control of data and change, MOS switch pipe Q7, MOS switch pipe Q8, MOS switch pipe Q9, MOS switch pipe Q10 grid potential also
Change is produced with the change of pin-saving chip U1 data.
Resistance R3, comparison amplifier IC5, resistance R10, comparison amplifier IC1, resistance R11, MOS switch pipe Q7, resistance
R12 constitutes the constant current prosecution unit to LED bead string DL1.The lamp bead number change connected when LED bead string DL1 lamp beads string
When, the total forward voltage Vf values for being added in LED bead string DL1 two ends change, and the lamp bead quantity of such as DL1 lamp beads string series connection subtracts
Few, the total forward voltage Vf values for being added in LED bead string DL1 two ends reduce, and flow through the electricity on resistance R3 electric current increase, resistance R3
Pressure drop increase, comparison amplifier IC5 output voltage rises, and comparison amplifier IC1 negative input end voltage rises, and causes to compare
Amplifier IC1 output voltage declines, and the MOS switch pipe Q7 grid voltages being connected with resistance R11 decline, MOS switch pipe Q7 leakages
Source current is reduced, and the electric current for flowing through DL1 lamp bead strings is reduced, so that the electric current for flowing through resistance R3 is reduced, on resistance R3
Voltage drop declines, and forms a feedback, serves the effect of the constant current prosecution to DL1 lamp bead strings.As a same reason, if DL1 lamp beads
The lamp bead quantity increase of string series connection, can by flow through R3 and current boost, the voltage drop on resistance R3 rises.
Resistance R4, comparison amplifier IC6, resistance R16, comparison amplifier IC2, resistance R17, MOS switch pipe Q8, resistance
R18 constitutes the constant current prosecution unit to LED bead string DL2；Resistance R5, comparison amplifier IC7, resistance R21, comparison amplifier
IC3, resistance R22, MOS switch pipe Q9, resistance R23 constitute the constant current prosecution unit to LED bead string DL3；Resistance R6, compare
Amplifier IC8, resistance R26, comparison amplifier IC4, resistance R27, MOS switch pipe Q10, resistance R28 are constituted to LED bead string
DL4 constant current prosecution unit；Above-mentioned constant current prosecution unit each works independently, and corresponding external LED bead string is driven respectively, mutually
Do not disturb.
In practice, the multigroup constant-current drive circuit encapsulation of LED is fabricated to chip, only needs simple external elimination parasitic
The electric capacity of vibration, greatly reduces the volume of drive circuit, is easy to promote the use of.
The present invention is explained in detail above in association with accompanying drawing, but the present invention is not limited to described embodiment.This
The basic ideas of invention are to provide a kind of drive circuit for realizing multigroup LED bead string independence constant current-supplying so that in parallel
LED bead string is not interfere with each other between string and string, and realizes the interval luminous of LED, is reduced LED junction temperature, is extended LED lamp
Service life；Only illustrate the ability to realize that the LED of 4 groups of lamp bead string independence constant current-supplyings is multigroup in the embodiment that the present invention is provided
The driving chip that constant-current drive circuit and encapsulation are formed, but for the person of ordinary skill of the art, according to the present invention
Teaching, more than 4 groups of constant current driver circuit for LED can be realized and not need performing creative labour by designing.Therefore do not departing from
In the case of the principle of the present invention change, modification, replacement and modification that these embodiments are carried out are still fallen within the guarantor of the present invention
In the range of shield.
Claims (3)
- The multigroup constant-current drive circuits of 1.LED, it is characterised in that：The particular circuit configurations of the multigroup constant-current drive circuits of described LED For：Resistance R2 one end is connected with power supply Vin, negative electrode, the positive-negative-positive three of the other end of the resistance R2 respectively with diode D1 One end of pole pipe Q1 emitter stage, resistance R14 one end and resistance R7 is connected, the plus earth of the diode D1, institute State negative electrode, pin-saving chip U1 VDD pins and the Phaseshift controlling chip U2 of the resistance R7 other end respectively with diode D2 VDD pins be connected, the anode of the diode D2, the A0 pins of the pin-saving chip U1, A1 pins, A2 pins, The R pins and GND pin of WP pins, GND pin and the Phaseshift controlling chip U2 are grounded；The pin-saving chip The U1 external read-write control signals of Read-write Catrol pin SCL, the external numbers of data-out pin SDA of the pin-saving chip U1 According to input signal, and it is connected to Phaseshift controlling chip U2 CK pins；The T1 pins of the Phaseshift controlling chip U2 and NPN type three Pole pipe Q3 base stage is connected, and the T2 pins of the Phaseshift controlling chip U2 are connected with NPN type triode Q4 base stage, phase shift Control chip U2 T3 pins are connected with NPN type triode Q5 base stage, Phaseshift controlling chip U2 T4 pins and NPN type three Pole pipe Q6 base stage is connected；The base stage and dimming input signal of the other end of the resistance R14 respectively with NPN type triode Q2 PWM is connected, and is connected after the colelctor electrode connection resistance R1 of the NPN type triode Q2 with the base stage of the PNP type triode Q1 Connect, the one end of the colelctor electrode of the PNP type triode Q1 respectively with resistance R8, resistance R13, resistance R19 and resistance R24 is connected Connect, the other end of the resistance R8 is connected with resistance R9 one end and comparison amplifier IC1 negative input end respectively, the electricity The resistance R13 other end is connected with resistance R15 one end and comparison amplifier IC2 negative input end respectively, the resistance R19's The other end is connected with resistance R20 one end and comparison amplifier IC3 negative input end respectively, the other end of the resistance R24 It is connected respectively with resistance R25 one end and comparison amplifier IC4 negative input end；The positive input of the comparison amplifier IC1 End is connected with MOS switch pipe Q7 source electrode and resistance R12 one end respectively, the positive input terminal point of the comparison amplifier IC2 Be not connected with MOS switch pipe Q8 source electrode and resistance R18 one end, the positive input terminal of the comparison amplifier IC3 respectively with MOS switch pipe Q9 source electrode is connected with resistance R23 one end, and the positive input terminal of the comparison amplifier IC4 is opened with MOS respectively The source electrode for closing pipe Q10 is connected with resistance R28 one end；The output end of the comparison amplifier IC1 and resistance R11 one end phase Connection, the other end of the resistance R11 is connected with MOS switch pipe Q7 grid and NPN type triode Q3 colelctor electrode respectively, The output end of the comparison amplifier IC2 is connected with resistance R17 one end, and the other end of the resistance R17 is opened with MOS respectively The grid for closing pipe Q8 is connected with NPN type triode Q4 colelctor electrode, output end and the resistance R22 of the comparison amplifier IC3 One end be connected, the grid and NPN type triode Q5 current collection of the other end of the resistance R22 respectively with MOS switch pipe Q9 Pole is connected, and the output end of the comparison amplifier IC4 is connected with resistance R27 one end, the other end point of the resistance R27 It is not connected with MOS switch pipe Q10 grid and NPN type triode Q6 colelctor electrode；The transmitting of the NPN type triode Q2 Pole, the resistance R9 other end, NPN type triode Q3 emitter stage, the resistance R12 other end, the resistance R15 other end, NPN type Triode Q4 emitter stage, the resistance R18 other end, the resistance R20 other end, NPN type triode Q5 emitter stage, resistance The R23 other end, the resistance R25 other end, NPN type triode Q6 emitter stage, resistance R28 other end ground connection；The electricity Source Vin positive input terminals respectively with comparison amplifier IC5, comparison amplifier IC6 positive input terminal, comparison amplifier IC7 are just Input, comparison amplifier IC8 positive input terminal are connected, after the output end series resistor R10 of the comparison amplifier IC5 with Comparison amplifier IC1 negative input end is connected, and is put after the output end series resistor R16 of the comparison amplifier IC6 with being compared Big device IC2 negative input end is connected, with comparison amplifier IC3 after the output end series resistor R21 of the comparison amplifier IC7 Negative input end be connected, it is negative defeated with comparison amplifier IC4 after the output end series resistor R26 of the comparison amplifier IC8 Enter end to be connected；Between the negative input end of the comparison amplifier IC5 and the drain electrode of the MOS switch pipe Q7, it is described compared put Between the drain electrode of big device IC6 negative input end and the MOS switch pipe Q8, the negative input end of the comparison amplifier IC7 and institute State between MOS switch pipe Q9 drain electrode and the comparison amplifier IC8 negative input end and the MOS switch pipe Q10 leakage External LED bead string is respectively used between pole.
- 2. the multigroup constant-current drive circuits of LED according to claim 1, it is characterised in that：In the Phaseshift controlling chip U2 The particular circuit configurations in portion include 14 binary system serial counter IC9, Johnson counter IC10, two input Schmidts Trigger IC11, IC12, switching diode D3, slide rheostat RW1, resistance R29, resistance R30, resistance R31, electric capacity C4, electricity Hold C5 and double D trigger IC13 ~ IC24；The RST pins ground connection of 14 binary system serial counter IC9, and described 14 The R pins that position binary system serial counter IC9 RST pins are Phaseshift controlling chip U2；14 binary serials are counted Device IC9 CIN pins connection resistance R29 one end, the COUT pins connection electric capacity of 14 binary system serial counter IC9 C4 one end, 14 binary system serial counter IC9'sPin connection resistance R30 one end, the resistance R29 The other end and electric capacity C4 the other end, and the resistance R30 other end is connected, 14 binary system serial counters Clock pins CK of the IC9 Q4 pins respectively with double D trigger IC13 ~ IC24 is connected, and 14 binary serials are counted Device IC9 Q7 pins are connected with Johnson counters IC10 CLK pin；The Johnson counters IC10'sPin is connected with Johnson counters IC10 Q5 pins, described Johnson counters IC10 RST pins ground connection, the Q0 pins of the Johnson counters IC10 and two input Schmidts Trigger IC11 the second input pin is connected, and the first input pin of the two inputs Schmidt trigger IC11 is phase Move control chip U2 CK pins；The output pin connecting valve diode D3 of two inputs Schmidt trigger IC11 negative pole, the pole of switch two Pipe D3 positive pole is connected with two input Schmidt trigger IC12 the first input pin and the second input pin, while institute State and be grounded after switching diode D3 positive pole serial capacitance C5, one end of the slide rheostat RW1 is connected with power vd D, It is connected after the other end series resistor R31 of the slide rheostat RW1 with switching diode D3 positive pole；The output pin of the two inputs Schmidt trigger IC12 produces T1 pulse output signals, and and double D trigger IC13 data-out pin D is connected, and the set pin S of the double D trigger IC13 ~ IC24 is grounded, described pair of D triggering Device IC13 ~ IC23 reset pin R is grounded, the true form output pin Q and double D trigger IC14 of the double D trigger IC13 Data-out pin D be connected, the true form output pin Q and double D trigger IC15 of the double D trigger IC14 data are defeated Enter pin D to be connected, the true form output pin Q and double D trigger IC16 of the double D trigger IC15 data-out pin D It is connected, the true form output pin Q of the double D trigger IC16 produces T2 pulse output signals, and with double D trigger IC17's Data-out pin D is connected, the true form output pin Q and double D trigger IC18 of the double D trigger IC17 data input Pin D is connected, the true form output pin Q and double D trigger IC19 of the double D trigger IC18 data-out pin D phases Connection, the true form output pin Q and double D trigger IC20 of the double D trigger IC19 data-out pin D is connected, institute State double D trigger IC20 true form output pin Q produce T3 pulse output signals, and with double D trigger IC21 data input Pin D is connected；The true form output pin Q and double D trigger IC22 of the double D trigger IC21 data-out pin D phases Connection, the true form output pin Q and double D trigger IC23 of the double D trigger IC22 data-out pin D is connected, institute The data-out pin D for stating double D trigger IC23 true form output pin Q and double D trigger IC24 is connected, and described couple of D is touched The true form output pin Q for sending out device IC24 produces T4 pulse output signals.
- 3. the multigroup constant-current drive circuits of LED according to claim 1 or 2, it is characterised in that：The multigroup constant currents of described LED Drive circuit, which is packaged in quadrangle packaging body, forms driving chip, and the pin of the driving chip is symmetricly set in driving chip Two long sides, the pin be 16, specifically include DE pins, D1+ pins, D2+ pins, D1- pins, D3+ pins, GND Pin, PGND pins, D2- pins, D3- pins, D4- pins, DC pins, PWM pins, D4+ pins, SDA pins, SCL pins, Vin pins；The DE pins are used for external internal electric source decoupling capacitance, and between the D1+ pins and D1- pins, the D2+ draws It is respectively used between pin and D2- pins, between the D3+ pins and D3- pins and between the D4+ pins and D4- pins External LED bead string, the GND pin is used for digital grounding, and the PGND pins are grounded for power, and the DC pins are used for External weakening electric capacity, the PWM pins are used for external dim signal, and the SDA pins are used for input data, the SCL pins For data read-write control, the Vin pins are used for input power.
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| JP6851567B2 (en) | 2017-05-27 | 2021-03-31 | 李玉麟 | Drive system |
| CN108024414A (en) * | 2017-12-04 | 2018-05-11 | 欧普照明股份有限公司 | High voltage and constant current chip, constant-current supply, lamps and lanterns module and lamps and lanterns |
| TWI687132B (en) | 2018-05-03 | 2020-03-01 | 李玉麟 | Driver device |
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| US20090225020A1 (en) * | 2008-03-07 | 2009-09-10 | O2Micro, Inc. | Backlight controller for driving light sources |
| CN101790267A (en) * | 2010-01-18 | 2010-07-28 | 海洋王照明科技股份有限公司 | Bionic synchronous signal lamp and control circuit thereof |
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| US20090225020A1 (en) * | 2008-03-07 | 2009-09-10 | O2Micro, Inc. | Backlight controller for driving light sources |
| CN101790267A (en) * | 2010-01-18 | 2010-07-28 | 海洋王照明科技股份有限公司 | Bionic synchronous signal lamp and control circuit thereof |
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