CN106231735B - A kind of LED driver and LED drive circuit structure - Google Patents
A kind of LED driver and LED drive circuit structure Download PDFInfo
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- CN106231735B CN106231735B CN201610817365.2A CN201610817365A CN106231735B CN 106231735 B CN106231735 B CN 106231735B CN 201610817365 A CN201610817365 A CN 201610817365A CN 106231735 B CN106231735 B CN 106231735B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a kind of LED driver and LED drive circuit structure.LED driver includes：For detecting the busbar voltage detection circuit of busbar voltage, for the first current regulating circuit according to varying DC link voltage sample resistance resistance, the second current regulating circuit for the internal reference voltage according to varying DC link voltage LED constant current control chip and for realizing the switching power circuit of current constant control according to sample resistance resistance and internal reference voltage-regulation output current；The switching power circuit includes the sample resistance and the LED constant current control chip.Driving input of the LED driver as LED in the present invention, the working condition of sample resistance resistance and LED constant current control chip can be adjusted automatically according to the change of busbar voltage, LED electric current is flowed through to realize current constant control so as to adjust, realize multiple LED drivers to be used in series, the installation of LED illumination product more flexibly, is more facilitated.
Description
Technical field
The present invention relates to LED technology field, more particularly to a kind of LED driver and LED drive circuit structure.
Background technology
Existing LED drivings input all can only be used in parallel on the market, that is, L (live wire), the N (zero line) for inputting civil power can
To connect a LED driving, two LED drivings can also be connect, until multiple LED drive.However, such LED drivings input
Can only be used in parallel, if running into the situation for needing to be used in series LED drivings, occur that work is abnormal, is unable to reach
It is expected that output current, the state of power output or other specification the problems such as can not meeting to require, cause LED illumination product is installed
Become very not convenient.
The content of the invention
It is an object of the invention to provide a kind of LED driver and LED drive circuit structure, it is defeated to realize LED driver
Enter being connected in series for end so that installation LED illumination product is more convenient, more flexible.
To use following technical scheme up to this purpose, the present invention：
A kind of LED driver, including：For detecting the busbar voltage detection circuit of busbar voltage, for according to bus electricity
Pressure adjusts the first current regulating circuit of sample resistance resistance, for according in varying DC link voltage LED constant current control chip
Second current regulating circuit of portion's reference voltage and for according to sample resistance resistance and internal reference voltage-regulation output current
To realize the switching power circuit of current constant control；The switching power circuit includes the sample resistance and the LED constant current control
Coremaking piece.
Wherein, first current regulating circuit includes：1st voltage-stabiliser tube, the 15th resistance, the 6th electric capacity, 2MOSFET pipe,
3rd sample resistance；The 2MOSFET pipes are managed for N-channel MOS FET；
The drain electrode of the 2MOSFET pipes connects one end of the 3rd sample resistance, the 3rd sample resistance it is another
Connecting detection voltage VCS is held, the grid of the 2MOSFET pipes connects one end of the 1st voltage-stabiliser tube, the 15th electricity respectively
One end of resistance and one end of the 6th electric capacity, the other end of the 1st voltage-stabiliser tube, the other end of the 15th resistance, described
The source grounding of the other end of 6 electric capacity and the 2MOSFET pipes.
Wherein, the busbar voltage detection decision circuitry includes：11st resistance, the 12nd resistance, the 13rd resistance, the 14th electricity
Resistance, the 19th resistance, the 20th resistance, the 21st resistance, the 2nd voltage-stabiliser tube, the 5th electric capacity, triode；The triode is the pole of NPN type three
Pipe；
The colelctor electrode of the triode connects one end of the 14th resistance and the grid of the 2MOSFET pipes respectively,
The other end of 14th resistance connects one end of the 21st resistance, and the other end of the 21st resistance connects busbar voltage,
The base stage of the triode connects one end of the 19th resistance and one end of the 20th resistance respectively, the 19th resistance
The other end connects the positive pole of the 2nd voltage-stabiliser tube, the negative pole of the 2nd voltage-stabiliser tube connect respectively one end of the 12nd resistance,
One end of 13rd resistance and one end of the 5th electric capacity, the other end of the 12nd resistance connect the 11st resistance
One end, the other end of the 11st resistance connect the busbar voltage, the emitter stage of the triode, the 20th resistance it is another
The other end of one end, the other end of the 13rd resistance and the 5th electric capacity is grounded.
Wherein, second current regulating circuit includes：16th resistance, the 17th resistance, the 18th resistance and the 7th electric capacity；
One end connection busbar voltage of 16th resistance, the other end of the 16th resistance connect the 17th resistance
One end, the other end of the 17th resistance connect one end of the 18th resistance, one end and DIM ends of the 7th electric capacity respectively,
The other end of 18th resistance and the other end of the 7th electric capacity are grounded.
Wherein, the switching power circuit includes LED constant current control chip U1,1MOSFET pipe, rectifier bridge BD1, transformation
Device armature winding T1, assists winding NUX, the 1st inductance, the 2nd inductance, the 1st diode, the 2nd diode, the 3rd diode, the 1st take
Sample resistance, the 2nd sample resistance, the 1st resistance, the 2nd resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance,
8 resistance, the 9th resistance, the 10th resistance, piezo-resistance RV1, the 2nd electric capacity, the 3rd electric capacity, the 4th electric capacity, the 8th electric capacity, the 9th electric capacity, electricity
Hold CBB1, polar capacitor C1, electric capacity CX1, fuse F1；
The model BP2318 of the LED constant current control chip U1, the 1MOSFET pipes are managed for N-channel MOS FET；
The 1st pin of the LED constant current control chip U1 connects one end of the 3rd electric capacity, the LED constant current control chip U1's
2nd pin connects one end, one end of the 4th resistance and the negative pole of the 1st diode of the 2nd electric capacity, the other end of the 4th resistance respectively
One end of the 3rd resistance is connected, the other end of the 3rd resistance connects electric capacity CBB1 one end, the 2nd pin of rectifier bridge, mother respectively
Line voltage, the negative pole of the 3rd diode, polar capacitor C1 positive pole, one end of the 10th resistance and LED anode connection terminals, it is described whole
1st pin of stream bridge connects one end of the 1st inductance and one end of the 1st resistance respectively, and the other end of the 1st inductance connects the respectively
The other end of 1 resistance, electric capacity CX1 one end, piezo-resistance RV1 one end and civil power live wire connection end, the 3rd of the rectifier bridge the
Pin connects one end of the 2nd inductance and one end of the 2nd resistance respectively, and the other end of the 2nd inductance connects the 2nd resistance respectively
The other end, the other end, the other end of the piezo-resistance RV1 and fuse F1 one end of the electric capacity CX1, the insurance
The silk F1 other end connects the civil power zero line connection end, and the positive pole of the 3rd diode connects primary winding respectively
The drain electrode of T1 one end, one end of the 8th electric capacity and 1MOSFET pipes, the other end of the primary winding T1 connect respectively
One end and LED negative poles connection end of the negative pole of the polar capacitor C1, the other end of the 10th resistance, the 4th electric capacity are connect, it is described
The source electrode of 1MOSFET pipes connect respectively the other end of the 8th electric capacity, one end of the 1st sample resistance, the 2nd sample resistance one end,
One end of 8th resistance, the 4th pin of the LED constant current control chip U1 and detection voltage VCS, the grid of the 1MOSFET pipes
The other end, one end of the 9th resistance and one end of the 7th resistance of the 8th resistance, the other end of the 9th resistance are connected respectively
The positive pole of the 2nd diode is connected, the other end of the 7th resistance connects the negative pole and LED perseverances of the 2nd diode respectively
Flow control chip U1 the 5th pin, the positive pole of the 1st diode connect respectively the 5th resistance one end and assists winding NUX one
End, the 3rd pin of the LED constant current control chip U1 connect the other end of the 5th resistance, one end and the 9th of the 6th resistance respectively
One end of electric capacity, the 7th pin connection DIM ends of the LED constant current control chip U1, the 8th pin of the LED constant current control chip U1
Vacantly, the other end of the 3rd electric capacity, the other end of the 2nd electric capacity, the other end, the rectifier bridge of the electric capacity CBB1
The 4th pin, the other end of the 4th electric capacity, the other end of the 1st sample resistance, the 2nd sample resistance the other end,
The other end of the assists winding NUX, the other end of the 6th resistance, the other end of the 9th electric capacity and LED constant current control
Chip U1 the 6th pin is grounded.
A kind of LED drive circuit structure, comprising the LED driver described at least two any of the above-described, the LED drivings
It is connected in series between device.
A kind of LED drive circuit structure, comprising the LED driver described at least two any of the above-described, the LED drivings
It is connected in parallel between device.
Beneficial effects of the present invention are：LED driver in the present invention includes：For detecting the busbar voltage of busbar voltage
Detect circuit, for the first current regulating circuit according to varying DC link voltage sample resistance resistance, for according to busbar voltage
Adjust the second current regulating circuit of the internal reference voltage of LED constant current control chip and for according to sample resistance resistance and interior
Portion's reference voltage adjusts output current to realize the switching power circuit of current constant control；The switching power circuit includes described take
Sample resistance and the LED constant current control chip.Driving input of the LED driver as LED, can be automatically according to busbar voltage
Change adjust the working condition of sample resistance resistance and LED constant current control chip, so as to adjusting the electric current for flowing through LED with reality
Existing current constant control, not only can be used in parallel with multiple LED drivers, and realizes multiple LED drivers and be used in series, and makes
The installation of LED illumination product is more flexible, is brought great convenience for user.
Brief description of the drawings
Fig. 1 is a kind of modular structure schematic diagram of LED driver of the present invention.
Fig. 2 is a kind of the first current regulating circuit of LED driver of the present invention and the electricity of busbar voltage detection decision circuitry
Road schematic diagram.
Fig. 3 is a kind of circuit theory diagrams of second current regulating circuit of LED driver of the present invention.
Fig. 4 is a kind of circuit theory diagrams of the switching power circuit of LED driver of the present invention.
Fig. 5 is a kind of a kind of structural representation of LED drive circuit structure of the present invention.
Fig. 6 is a kind of another structural representation of LED drive circuit structure of the present invention.
Fig. 7 is a kind of another structural representation of LED drive circuit structure of the present invention.
Embodiment
Technical scheme is further illustrated below in conjunction with accompanying drawing 1 to accompanying drawing 6 and by embodiment.
Embodiment one：
Fig. 1 is a kind of modular structure schematic diagram of LED driver of the present invention, as shown in figure 1, a kind of LED driver, bag
Include：For detecting the busbar voltage detection circuit of busbar voltage, for first according to varying DC link voltage sample resistance resistance
Current regulating circuit, the second current regulation for the internal reference voltage according to varying DC link voltage LED constant current control chip
Circuit and for realizing the Switching Power Supply of current constant control according to sample resistance resistance and internal reference voltage-regulation output current
Circuit；The switching power circuit includes the sample resistance and the LED constant current control chip.
Driving input of the LED driver as LED, sample resistance can be adjusted automatically according to the change of busbar voltage
The working condition of resistance and LED constant current control chip, not only can be with so as to adjust the electric current for flowing through LED to realize current constant control
Multiple LED drivers are used in parallel, and realize multiple LED drivers and be used in series, and make the installation of LED illumination product more
Flexibly, brought great convenience for user.
Fig. 2 is a kind of the first current regulating circuit of LED driver of the present invention and the electricity of busbar voltage detection decision circuitry
Road schematic diagram, as shown in Fig. 2 the first current regulating circuit includes：1st voltage-stabiliser tube DZ1, resistance R15, electric capacity C6,2MOSFET
Pipe Q2, the 3rd sample resistance RS3；The 2MOSFET pipes Q2 manages for N-channel MOS FET；
The drain electrode of the Q2 connects one end of the RS3, RS3 other end connecting detection voltage VCS, the grid of the Q2
One end of one end of the DZ1, one end of the R15 and the C6, the DZ1 other end, the R15 other end, institute are connected respectively
State the other end of the 6th electric capacity and the source grounding of the 2MOSFET pipes.
Preferably, DZ1 is 5.1V voltage-stabiliser tubes, and C6 is 1uF/25V electric capacity, and Q2 model WFY3N02, RS3 are 1.2 Ω.
As shown in Fig. 2 the busbar voltage detection decision circuitry includes：Resistance R11, R12, R13, R14, R19, R20 and
R21, the 2nd voltage-stabiliser tube DZ2, electric capacity C5, triode Q3；The triode Q3 is NPN type triode；
The colelctor electrode of the Q3 connects one end of the R14 and the grid of the Q2, the other end connection of the R14 respectively
One end of the R21, the other end connection busbar voltage (i.e. Vbulk ends) of the R21, described in the base stage of the Q3 connects respectively
R19 one end and one end of the R20, the other end of the R19 connect the positive pole of the DZ2, and the negative pole of the DZ2 connects respectively
One end of one end of the R12, one end of the R13 and the C5 is connect, the other end of the R12 connects one end of the R11,
The other end of the R11 connects the Vbulk ends, the emitter stage of the Q3, the other end of the R20, the other end of the R13
It is grounded with the other end of the C5.
Preferably, R11 is 510K Ω, and R12 is 390K Ω, and R13 is 42.2K Ω, and R14 is that 510K Ω, R19 are 2K Ω, R20
For 10K Ω, R21 is that 510K Ω, DZ2 are 5.1V voltage-stabiliser tubes, and C5 is 2.2uF/25V electric capacity, Q3 model MMBT3904.
When busbar voltage (Vbulk) is sufficiently large, when DZ2 is turned on, Q3 B poles (base stage) are high voltage, and Q3 is turned on, Q3
C poles (colelctor electrode) be low-voltage, Q2 G poles (grid) connection Q3 C poles also be low-voltage, and Q2 ends, and RS3 is not switched on；
When Vbulk is an original half by partial pressure, it is insufficient to allow DZ2 to turn on, Q3 B poles (base stage) are low-voltage, and Q3 ends, Q3
C poles (colelctor electrode) be high voltage, Q2 G poles (grid) connection Q3 C poles also be high voltage, Q2 conductings, RS3 connections.Realize
Determine whether RS3 connects according to Vbulk change, the sensitive value for adjusting sample resistance.
Fig. 3 is a kind of circuit theory diagrams of second current regulating circuit of LED driver of the present invention, as shown in figure 3, second
Current regulating circuit includes：Resistance R16, R17, R18 and electric capacity C7；
One end connection Vbulk ends of the R16, the other end of the R16 connect one end of the R17, and the R17's is another
One end connects the other end of one end of the R18, one end and DIM ends of the C7, the other end of the R18 and the C7 respectively
It is grounded.
Preferably, R16 is 240K Ω, and R17 is that 330K Ω, R16 are 10K Ω, C7 2.2uF.
Fig. 4 is a kind of circuit theory diagrams of the switching power circuit of LED driver of the present invention, as shown in figure 4, Switching Power Supply
Circuit includes LED constant current control chip U1,1MOSFET pipes Q1, rectifier bridge BD1, primary winding T1, assists winding
NUX, inductance L1 and L2, diode D1, D2 and D3, sample resistance RS1, RS2, resistance R1, R2, R3, R4, R5, R6, R7, R8, R9
And R10, piezo-resistance RV1, electric capacity C2, C3, C4, C8 and C9, electric capacity CBB1, polar capacitor C1, electric capacity CX1, fuse F1；
The model BP2318 of the LED constant current control chip U1, the 1MOSFET pipes are managed for N-channel MOS FET；
The 1st pin connection C3 of U1 one end, the 2nd pin of the U1 connect C2 one end, R4 one end and D1 respectively
Negative pole, the other end connection R3 of R4 one end, the other end of the R3 connects electric capacity CBB1 one end, BD1 respectively
2nd pin, Vbulk ends, D3 negative pole, polar capacitor C1 positive pole, R10 one end and LED anode connection terminals, the 1st of the BD1 the
Pin connects L1 one end and R1 one end respectively, the other end of the L1 connect respectively the R1 other end, electric capacity CX1 one end,
Piezo-resistance RV1 one end and civil power live wire connection end, the 3rd pin of the BD1 connect L2 one end and R2 one end respectively, institute
State L2 the other end connect respectively the other end of the R2, the other end of the electric capacity CX1, the piezo-resistance RV1 it is another
End and fuse F1 one end, the other end of the fuse F1 connect the civil power zero line connection end, the positive pole point of the D3
Not Lian Jie primary winding T1 one end, C8 one end and Q1 drain electrode, the other end of the primary winding T1
Negative pole, the other end of the R10, C4 one end and the LED negative poles connection end of the polar capacitor C1 is connected respectively, the Q1's
Source electrode connects the C8 other end, RS1 one end, RS2 one end, R8 one end, U1 the 4th pin and detection voltage VCS, Q1 respectively
Grid connect one end of the other end of the R8, R9 one end and R7, the other end connection D2 of R9 positive pole, institute respectively
The other end for stating R7 connects the negative pole of the D2 and U1 the 5th pin respectively, and the positive pole of the D1 connects R5 one end and auxiliary respectively
Winding NUX one end is helped, U1 the 3rd pin connects one end of the other end of the R5, R6 one end and C9, U1 the 7th pin respectively
DIM ends are connected, U1 the 8th pin is hanging, the other end of the C3, the other end of the C2, the other end of the electric capacity CBB1, institute
State DB1 the 4th pin, the other end of the C4, the other end of the RS1, the other end of the RS2, the assists winding NUX
The other end, the other end of the C6, the C9 other end and U1 the 6th pin are grounded.
Preferably, Q1 model 2N65, BD1 model UM108, C1 and C2 are 3.5mH, and D1 ES1J, D2 are
1N4148, D3 ES2J, RS1 are 1.6 Ω, and RS2 is that 2.4 Ω, R1 and R2 are 4.7K Ω, and R3 is that 240K Ω, R4 are 300K Ω,
R5 is 220K Ω, and R6 is that 10K Ω, R7 are 67 Ω, and R8 is 10K Ω, piezo-resistance RV1 model 7D511, C2 4.7uF/
25V, electric capacity CBB1 are 683J 500V, and fuse F1 is 1602mA 250V AC.
When LED load is operated alone in a LED driver, the operation principle of LED driver is as follows：
Civil power forms Vbulk ends after rectifier bridge BD1, and Vbulk starts Vcc of the resistance (R3 and R4) to U1 by two
Power supply, U1 start, U1 the 5th pin (Gate pin) output high level, the Q1 conductings of driving 1MOSFET pipes, and U1 the 4th pin draws inspection
Voltage (VCS ends) is surveyed, VCS terminal potentials are sample resistance RS1, RS2 current potential, and U1 the 4th pin (CS pin) detects VCS ends electricity
Position is Vcs1, and by Vcs1 compared with U1 internal reference voltage, realizes constant current output, and output current is：Iout≈
VREF/ (2*RCS), wherein, RCS is sampling resistor.
U1 the 7th pin (DIM pin) measures the voltage Vdim1 (voltage at DIM ends) of resistance R17 and R18 junction, when
When Vdim1 is more than the upper voltage limit of DIM dimming scopes, U1 is in normal operating conditions, and Vcs1 is fixed value, and output current is to set
The 100% of definite value, that is, export with specified full current work.
2nd voltage-stabiliser tube DZ2 voltage stabilizings turn on, and triode Q3 B poles (base stage) obtain a high level, and Q3 is turned on, the
2MOSFET pipes Q2 G poles (grid) are low level, cause Q2 to disconnect, and no current flows through on sample resistance RS3, now RS3 not with
RS1, RS2 form parallel resistance and participate in current sampling, and rely solely on sample resistance RS1 and RS2 and carry out current sampling, Vcs1=
Ics* (RS1//RS2), Ics are sampling current (electric current for flowing through RS1 and RS2), realize current constant control；Sampling current Ics is passed through
After crossing GND, rectifier bridge BD1 the 4th pin (rectifier bridge BD1 the 4th pin is connected together with GND) is connected to, then by rectifier bridge BD1
A diode reach rectifier bridge BD1 the 3rd pin, return to input, form a loop.Rectifier bridge BD1 output end is (whole
Flow bridge BD1 the 2nd pin) voltage be busbar voltage (Vbulk).The main circuit loop of whole electric current is：AC_L (civil power fire
Line) -- LED driver live wire connection end --- BD1 the 1st pin --- BD1 the 2nd pin --- Vbulk ends ----LED positive poles connection
End --- LED positive poles (LED+) --- LED negative poles (LED-) --- LED negative poles connection end --- primary winding --- the
--- 1MOSFET pipes Q1 S poles --- GND (DB1 the 4th pin) -- LED driver zero line connects for 1MOSFET pipes Q1 D poles
End --- AC_N (civil power zero line), so as to form the loop of a completion.
Transformer assists winding NUX senses LED voltage, give Vcc ends power supply, while by two divider resistance R5,
The FB pin that R6 is U1 produce a voltage, realize output OVP protections；When LED short circuits, output voltage is very low, now, aid in around
Group can not be powered to Vcc, and Vcc voltage is gradually reduced until under-voltage protection threshold value.After system enters guard mode, when Vcc is reached
During under-voltage protection threshold value, system will restart.The continuous detecting system state of simultaneity factor, if trouble shooting, system can be again
Start normal work.
U1 the 4th pin (CS pin) is additionally operable to carry out output end short-circuit protection monitoring：When output end (at sample resistance) occurs
When short circuit is abnormal, when a numerical value (internal reference voltage) will be large enough to by flowing through the voltage at CS ends, U1 the 5th pin (Gate pin)
Output is closed immediately, " hiccup " protection when realizing output short-circuit, now 1MOSFET pipes Q1 is in improper cut-off state,
System ceaselessly detects Vcs value；U1 Comp pin are realized to output current adjustment of load by a capacitance connection to GND
Rate, input voltage line regulation compensate, so as to which output current is controlled within the scope of LED normal works are caused.
The pin can also compensate correction to input PF (input power factor).
Embodiment two：
A kind of LED drive circuit structure, comprising at least two LED drivers described above, between the LED driver
It is connected in series.
Fig. 5 is refer to, Fig. 5 is a kind of a kind of structural representation of LED drive circuit structure of the present invention.As shown in figure 5, figure
In LED drive circuit structure be connected in series and form by two LED drivers (LED driver 1 and LED driver 2), LED drives
The live wire connection end connection civil power live wire of dynamic device 1, the live wire connection of the zero line connection end connection LED driver 2 of LED driver 1
End, the zero line connection end connection civil power zero line of LED driver 2；Wherein, LED driver 1 and LED driver 2 with embodiment one
In LED driver circuit it is identical (component, the building form of component identical and the parameter all same of component), LED
Driver 1 drives LED load 1, and LED driver 2 drives LED load 2.The LED drive circuit that two LED drivers are composed in series
The operation principle of structure is as follows：
With reference to Fig. 2-Fig. 5, civil power forms busbar voltage (Vbulk) after rectifier bridge, and Vbulk is by two startup resistance
(R3 and R4) is powered to U1 Vcc, and U1 starts, and U1 the 5th pin (Gate pin) output high level, driving 1MOSFET pipes Q1 is led
Logical, U1 the 4th pin draws VCS ends, and VCS terminal potentials are sample resistance RS1, RS2 current potential, U1 the 4th pin (CS pin) detection
It is Vcs2 to VCS terminal potentials, and by Vcs2 compared with U1 internal reference voltages, control electric current output；1 is driven for LED,
Now main circuit signal pathway is as follows：AC_L1 (civil power live wire) -- the live wire connection end of LED driver 1 --- be rectifier bridge BD1's
1st pin --- rectifier bridge BD1 the 2nd pin --- Vbulk ends ----LED anode connection terminals --- LED positive poles (LED+) --- LED negative poles
(LED-) --- LED negative poles connection end --- primary winding --- 1MOSFET pipes Q1 D poles --- 1MOSFET pipes Q1
S poles --- GND (rectifier bridge DB1 the 4th pin) -- zero line connection end of LED driver 1, formed one completion loop；LED
Zero line connection end (AC_N1) output of driver 1 is followed by the live wire connection end (AC_L2) of LED driver 2.For LED driver
2, its major signalling pathways loop is as follows：The 1st pin --- the 2nd pin of rectifier bridge --- of AC_N1---AC_L2--- rectifier bridges
--- --- --- LED negative poles (LED-) --- LED negative poles connection end -- become LED positive poles (LED+)-LED anode connection terminals at Vbulk ends
Depressor armature winding --- Q1D poles --- Q1S poles --- GND (the 4th pin of rectifier bridge is connected together with GND) --- 3rd of rectifier bridge
Pin --- AC_N2 (the zero line connection end of LED driver 2) --- civil power zero line, form the loop of a completion.
Due to all foring respective complete loop, and because the ginseng of two LED drivers when two LED drivers are connected
Number is just the same, and circuit parameter is symmetrical.Therefore, a Vbulk ends when LED driver drives each have been divided equally (with embodiment
Busbar voltage (Vbulk ends) in one is identical), now, the voltage of respective bus is Vbulk2 to " GND (the) " voltage of itself
=0.5*Vbulk；I.e. respective busbar voltage is the half of original inlet highway voltage；For LED driver 1, by
Reduce half in busbar voltage, the voltage Vdim2 now detected on the pin of U1 the 7th in theory than using single driver originally
When to reduce half, at least can be determined that Vdim2 be less than driving be used alone when voltage Vdim1.Now, U1 enters light modulation
DIM states, U1 CS pin position detect electric current, and control LED output currents are reduced；For LED driver 1, due to bus
Voltage reduces half, and the cathode potential on DZ2 also reduces half, and now the undertension on DZ2 is to cause DZ2 to turn on, and three
Pole pipe Q3 B extremely vacant states, it is in high level, Q2 conductings, sampling electricity in low level, Q3 cut-offs, Q2 G poles in other words
Hinder RS3 upstream overcurrent, with RS1, RS2 is used in parallel, participates in current sampling control, now Vcs2=Ics* (RS1//RS2//
RS3).Obviously, (RS1//RS2//RS3)<(RS1//RS2),Vcs2<Vcs1.Therefore, U1 the 5th pin (namely Gate pin) will
High level is exported, the increase of Q1 ON times, to increase the electric current in LED, the electric current for being allowed to export is driven when using with single
Electric current is consistent, or the output current with being used during multiple driving input parallel connections is consistent.U1, Q3 and Q2 constitute a negative-feedback
Process, ensure regulation output current uniformity, can be just in multiple LED driver tandem drive LED loads so as to realize
Often work.
During two LED driver tandem drive LED loads in the present invention, LED load can normal work, meet driving
The electric parameter such as input power, input power factor, output current, power output is constant when input is used in series, and realizes
LED driver tandem drive LED load, bringing great convenience property is being used and installed, and LED driver need not be changed
The component of circuit and the parameter of component, reduce production and the cost installed and used.
Fig. 6 is refer to, Fig. 6 is a kind of another structural representation of LED drive circuit structure of the present invention.As shown in fig. 6,
LED drive circuit structure in figure is connected in series by M LED driver to be formed (M >=3), the live wire connection end of LED driver 1
Connection civil power live wire, the live wire connection end of the zero line connection end connection LED driver 2 of LED driver 1, the zero of LED driver 2
Line connection end connects the live wire connection end ... ... of LED driver 3, LED driver M-1 zero line connection end connection LED driver
M live wire connection end, LED driver M zero line connection end connection civil power zero line；Wherein, LED driver 1, LED driver
2nd ..., the LED driver M (building forms of component and component identical with the circuit of the LED driver in embodiment one
It is identical), LED driver 1 drives LED load 1, and LED driver 2 drives LED load 2 ... ..., and LED driver M drivings LED is born
Carry M.
The operation principle of the situation for the LED drive circuit structure that M LED driver is composed in series and two LED drivers
The operation principle for the LED drive circuit structure being composed in series is identical.Due to partial pressure of connecting, the LED driver of series connection is more, each
The busbar voltage of individual LED driver is smaller, corresponding sample resistance also reduces, and the adjustment plus other component parameters is matched somebody with somebody
Close, so as to which the electric current for flowing through LED load is in so that in the range of LED load electric current normal work.Those skilled in the art
Member should appreciate that, it is necessary to which the change for the quantity connected according to LED driver is come first in the LED drive circuit for adjusting structure of adaptability
The parameter of device is to realize the normal work of each LED load.
LED driver in the present invention meets and single driving or multiple when multiple LED driving inputs are used in series
When driving input used in parallel, meet and input power, input work when single driving or multiple driving inputs used in parallel
The electric parameters such as rate factor, output current, power output are identical, suitable on LED T8 fluorescent tubes or similar products.
LED driver in the present invention meets that multiple fluorescent tube inputs can be used in series or input is in parallel
Using or individually fluorescent tube use, using and installing bringing great convenience property.
Embodiment three：
A kind of LED drive circuit structure, comprising the LED driver described at least two any of the above-described, the LED drivings
It is connected in parallel between device.
Fig. 7 is refer to, Fig. 7 is a kind of another structural representation of LED drive circuit structure of the present invention.As illustrated,
LED drive circuit structure in figure is connected in series by H LED driver to be formed (H >=2), LED driver 1, LED driver
2nd ..., LED driver H live wire connection end is all connected with civil power live wire, LED driver 1, LED driver 2 ..., LED drives
Dynamic device H zero line connection end is all connected with civil power zero line；Wherein, LED driver 1, LED driver 2 ..., LED driver M it is equal
It is identical with the circuit of the LED driver in embodiment one that (component, the building form of component are identical and the parameter of component is equal
It is identical), LED driver 1 drives LED load 1, and LED driver 2 drives LED load 2 ... ..., and LED driver M drivings LED is born
Carry M.Operation principle when being used when two or more LED driver is used in parallel with single led driver is identical.
In summary, the LED driver in the present invention not only can be with used in parallel, and can be used in series so that peace
Dress and using LED illumination product become according to flexibly, brought great convenience for user, solve need in the prior art by
The situation that LED drivings are used in series, then work abnormal, or is unable to reach estimated output current, the state of power output, or
The problems such as other specification can not meet to require.
The technical principle of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain the present invention's
Principle, and limiting the scope of the invention can not be construed in any way.Based on explanation herein, the technology of this area
Personnel would not require any inventive effort the other embodiments that can associate the present invention, and these modes are fallen within
Within protection scope of the present invention.
Claims (7)
- A kind of 1. LED driver, it is characterised in that including：For detecting the busbar voltage detection circuit of busbar voltage, for root According to the first current regulating circuit of varying DC link voltage sample resistance resistance, for being controlled according to varying DC link voltage LED constant current Second current regulating circuit of the internal reference voltage of chip and for according to sample resistance resistance and internal reference voltage-regulation Output current is to realize the switching power circuit of current constant control；The switching power circuit includes the sample resistance and described LED constant current control chip.
- 2. LED driver according to claim 1, it is characterised in that first current regulating circuit includes：1st is steady Pressure pipe, the 15th resistance, the 6th electric capacity, 2MOSFET pipes, the 3rd sample resistance；The 2MOSFET pipes are managed for N-channel MOS FET；The drain electrode of the 2MOSFET pipes connects one end of the 3rd sample resistance, and the other end of the 3rd sample resistance connects Meet detection voltage VCS, the grids of the 2MOSFET pipes connects one end of the 1st voltage-stabiliser tube, the 15th resistance respectively One end and one end of the 6th electric capacity, the other end of the 1st voltage-stabiliser tube, the other end of the 15th resistance, the 6th electricity The source grounding of the other end of appearance and the 2MOSFET pipes.
- 3. LED driver according to claim 2, it is characterised in that the busbar voltage detection decision circuitry includes：The 11 resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 19th resistance, the 20th resistance, the 21st resistance, the 2nd voltage-stabiliser tube, the 5th electricity Hold, triode；The triode is NPN type triode；The colelctor electrode of the triode connects one end of the 14th resistance and the grid of the 2MOSFET pipes respectively, described The other end of 14th resistance connects one end of the 21st resistance, and the other end connection busbar voltage of the 21st resistance is described The base stage of triode connects one end of the 19th resistance and one end of the 20th resistance respectively, the 19th resistance it is another End connects the positive pole of the 2nd voltage-stabiliser tube, and the negative pole of the 2nd voltage-stabiliser tube connects one end of the 12nd resistance, described respectively One end of 13rd resistance and one end of the 5th electric capacity, the other end of the 12nd resistance connect one end of the 11st resistance, The other end of 11st resistance connects the busbar voltage, the emitter stage of the triode, the 20th resistance the other end, The other end of 13rd resistance and the other end of the 5th electric capacity are grounded.
- 4. LED driver according to claim 1, it is characterised in that second current regulating circuit includes：16th electricity Resistance, the 17th resistance, the 18th resistance and the 7th electric capacity；One end connection busbar voltage of 16th resistance, the other end of the 16th resistance connect the one of the 17th resistance End, the other end of the 17th resistance connect one end of the 18th resistance, one end and DIM ends of the 7th electric capacity, institute respectively The other end of the other end and the 7th electric capacity of stating the 18th resistance is grounded.
- 5. LED driver according to claim 1, it is characterised in that the switching power circuit controls including LED constant current Chip U1,1MOSFET pipe, rectifier bridge BD1, primary winding T1, assists winding NUX, the 1st inductance, the 2nd inductance, the 1st Diode, the 2nd diode, the 3rd diode, the 1st sample resistance, the 2nd sample resistance, the 1st resistance, the 2nd resistance, the 3rd resistance, 4 resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the 10th resistance, piezo-resistance RV1, the 2nd electric capacity, 3 electric capacity, the 4th electric capacity, the 8th electric capacity, the 9th electric capacity, electric capacity CBB1, polar capacitor C1, electric capacity CX1, fuse F1；The model BP2318 of the LED constant current control chip U1, the 1MOSFET pipes are managed for N-channel MOS FET；One end of the 1st pin the 3rd electric capacity of connection of the LED constant current control chip U1, the 2nd of the LED constant current control chip U1 the Pin connects one end, one end of the 4th resistance and the negative pole of the 1st diode of the 2nd electric capacity respectively, and the other end of the 4th resistance connects One end of the 3rd resistance is connect, the other end of the 3rd resistance connects electric capacity CBB1 one end, the 2nd pin, the bus of rectifier bridge respectively Voltage, the negative pole of the 3rd diode, polar capacitor C1 positive pole, one end of the 10th resistance and LED anode connection terminals, the rectification 1st pin of bridge connects one end of the 1st inductance and one end of the 1st resistance respectively, and the other end of the 1st inductance connects the 1st respectively The other end of resistance, electric capacity CX1 one end, piezo-resistance RV1 one end and civil power live wire connection end, the 3rd of the rectifier bridge the Pin connects one end of the 2nd inductance and one end of the 2nd resistance respectively, and the other end of the 2nd inductance connects the 2nd resistance respectively The other end, the other end, the other end of the piezo-resistance RV1 and fuse F1 one end of the electric capacity CX1, the insurance The silk F1 other end connects the civil power zero line connection end, and the positive pole of the 3rd diode connects primary winding respectively The drain electrode of T1 one end, one end of the 8th electric capacity and 1MOSFET pipes, the other end of the primary winding T1 connect respectively One end and LED negative poles connection end of the negative pole of the polar capacitor C1, the other end of the 10th resistance, the 4th electric capacity are connect, it is described The source electrode of 1MOSFET pipes connect respectively the other end of the 8th electric capacity, one end of the 1st sample resistance, the 2nd sample resistance one end, One end of 8th resistance, the 4th pin of the LED constant current control chip U1 and detection voltage VCS, the grid of the 1MOSFET pipes The other end, one end of the 9th resistance and one end of the 7th resistance of the 8th resistance, the other end of the 9th resistance are connected respectively The positive pole of the 2nd diode is connected, the other end of the 7th resistance connects the negative pole and LED perseverances of the 2nd diode respectively Flow control chip U1 the 5th pin, the positive pole of the 1st diode connect respectively the 5th resistance one end and assists winding NUX one End, the 3rd pin of the LED constant current control chip U1 connect the other end of the 5th resistance, one end and the 9th of the 6th resistance respectively One end of electric capacity, the 7th pin connection DIM ends of the LED constant current control chip U1, the 8th pin of the LED constant current control chip U1 Vacantly, the other end of the 3rd electric capacity, the other end of the 2nd electric capacity, the other end, the rectifier bridge of the electric capacity CBB1 The 4th pin, the other end of the 4th electric capacity, the other end of the 1st sample resistance, the 2nd sample resistance the other end, The other end of the assists winding NUX, the other end of the 6th resistance, the other end of the 9th electric capacity and LED constant current control Chip U1 the 6th pin is grounded.
- 6. a kind of LED drive circuit structure, it is characterised in that comprising described at least two the claims any one of 1-5 LED driver, it is connected in series between the LED driver.
- 7. a kind of LED drive circuit structure, it is characterised in that comprising described at least two the claims any one of 1-5 LED driver, it is connected in parallel between the LED driver.
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| CN201610817365.2A CN106231735B (en) | 2016-09-12 | 2016-09-12 | A kind of LED driver and LED drive circuit structure |
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|---|---|---|---|
| CN201610817365.2A CN106231735B (en) | 2016-09-12 | 2016-09-12 | A kind of LED driver and LED drive circuit structure |
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| CN106231735B true CN106231735B (en) | 2017-11-28 |
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| US20050225976A1 (en) * | 2004-04-08 | 2005-10-13 | Integrated Illumination Systems, Inc. | Marine LED lighting network and driver |
| CN201252662Y (en) * | 2008-05-09 | 2009-06-03 | 深圳市东辰科技有限公司 | Constant current drive circuit for realizing high brightness LED lamp through utilizing switch power supply chip |
| CN101674693B (en) * | 2009-10-01 | 2012-07-18 | 英飞特电子（杭州）有限公司 | Multichannel constant-current control circuit applicable to LED driver |
| CN201839490U (en) * | 2010-10-22 | 2011-05-18 | 重庆天阳吉能科技有限公司 | Branch constant current driver for high-power LED (light-emitting diode) street lamp |
| CN105530728B (en) * | 2016-02-24 | 2017-06-16 | 西南交通大学 | A kind of bus current synchronous mode time-sharing multiplex multiple constant current output LED driver topology and its control method |
| CN206024181U (en) * | 2016-09-12 | 2017-03-15 | 深圳市豪恩光电照明股份有限公司 | A kind of LED driver and LED drive circuit structure |
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Address after: 518109 Longhua New District, Shenzhen, Guangdong, Da wave Street Da wave office, Tong Sheng Industrial Park Road, Horne Science Park, building A two floor, C area, middle and southern section of B District Patentee after: Shenzhen haoen intelligent joint Limited by Share Ltd Address before: 518109 Longhua New District, Shenzhen, Guangdong, Da wave Street Da wave office, Tong Sheng Industrial Park Road, Horne Science Park, building A two floor, C area, middle and southern section of B District Patentee before: SHENZHEN HORN PHOTOELECTRIC LIGHTING CO., LTD. |