CN108366462A - A kind of linear constant current driving chip and multi-chip parallel connection LED lighting circuit - Google Patents
A kind of linear constant current driving chip and multi-chip parallel connection LED lighting circuit Download PDFInfo
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- CN108366462A CN108366462A CN201810360250.4A CN201810360250A CN108366462A CN 108366462 A CN108366462 A CN 108366462A CN 201810360250 A CN201810360250 A CN 201810360250A CN 108366462 A CN108366462 A CN 108366462A
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- constant current
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- emitting diode
- linear constant
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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
- H05B45/345—Current stabilisation; Maintaining constant current
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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
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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 linear constant current driving chip and multi-chip parallel connection LED lighting circuits, are related to LED illumination circuit, and the linear constant current driving chip includes linear constant current driving circuit, metal base plate and at least eight pin；Pin is symmetrically distributed in the metal base plate both sides；Pin includes the first power end, the second power end, is arranged at least one middle power end of metal base plate side, and is arranged at the additional middle power end of the identical quantity of the metal base plate other side；Middle power end and additional middle power end are according to the identical one-to-one correspondence that puts in order, corresponding middle power end and the connection of additional middle power end；First power end, middle power end, the second power end and additional middle power end surround metal base plate and arrange successively；When constituting multi-chip parallel connection LED lighting circuit using the linear constant current driving chip, for circuit without using wire jumper, circuit is simple, and reliability is high.
Description
Technical field
The present invention relates to LED illumination circuit, specially a kind of linear constant current driving chip and multi-chip parallel connection LED power for illumination
Road.
Background technology
The rated power of existing high-power LED illumination driving circuit, a linear constant current driving chip can not usually expire
Sufficient use demand, it is often necessary to compose in parallel multi-chip parallel connection LED lighting circuit using multiple linear constant current driving chips to expand
Open up power.
With reference to figure 1, for it is existing include 3 linear constant current driving chips multi-chip parallel connection LED lighting circuit, including it is whole
Current circuit, 3 linear constant current driving chips in parallel and 3 light emitting diodes series lighting group in series.Rectification circuit
Input terminal for the bridge rectifier of 4 diodes composition, rectification circuit connects alternating current, and the anode of rectification circuit output end is even
The cathode of series lighting group is connect, and the cathode of rectification circuit output end is grounded and connects the anode with series lighting group.3 linear
The ground terminal of constant-current driven chip is grounded；8 pins of 3 linear constant current driving chips are connected with each other, and 7 pins are connected with each other, and 6
Pin is connected with each other；8 pins, 7 pins and 6 pins of linear constant current driving chip are separately connected the anode of 3 light emitting diodes.
In existing multi-chip parallel connection LED lighting circuit, 3 linear constant current driving chips, which ensure that, flows through each luminous two
The electric current of pole pipe is constant current.But, it is contemplated that the heat dissipation of light emitting diode and linear constant current driving chip, multi-chip parallel connection LED
The usual patch of lighting circuit is welded on the same single side and covers on the aluminum substrate of copper so that in multi-chip parallel connection LED lighting circuit
Wires cross point is required for realizing by wire jumper, increases cost and board area, while reducing multi-chip parallel connection LED
The reliability of lighting circuit, easy tos produce short circuit.
Invention content
The purpose of the present invention is to provide a kind of linear constant current driving chip and multi-chip parallel connection LED lighting circuits, with solution
Certainly the problems mentioned above in the background art.
To achieve the above object, the present invention proposes a kind of linear constant current driving chip, including linear constant current driving circuit,
Metal base plate and at least eight pin；The metal base plate is exposed on the outside of the linear constant current driving chip；The pin is symmetrical
It is distributed in the metal base plate both sides；The pin includes the first power end, the second power end；The pin further includes that setting exists
At least one middle power end of the metal base plate side, and the volume in the identical quantity of the metal base plate other side is set
Outer middle power end；The middle power end and the additional middle power end are according to the identical one-to-one correspondence that puts in order, phase
The corresponding middle power end and the additional middle power end are connected with each other；First power end, the middle power
End, second power end and the additional middle power end surround the metal base plate and arrange successively.
Further, the metal base plate, positioned at least one pin of middle power end side and positioned at described
At least one pin of additional middle power end side is respectively as the first, second, and third ground terminal.
Further, the middle power end and the additional middle power end are located at second ground terminal and described
The same side of three ground terminal lines；First power end and the second power end are located at second ground terminal and the third connects
The not homonymy of ground terminal line.
Further, the linear constant current driving circuit includes enabling unit, control circuit and at least one metal-oxide-semiconductor；It is described
Metal-oxide-semiconductor includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor and at least one centre metal-oxide-semiconductor；The control circuit includes resistance and operation amplifier
Device；The resistance includes first resistor, second resistance, sampling resistor and at least one interlaminated resistance；The operational amplifier includes
First operational amplifier, second operational amplifier and at least one intermediate operations amplifier；The first resistor, the intermediate electricity
Resistance and the second resistance are serially connected, and constitute resistance series connection group, the first resistor and the second resistance are located at the electricity
Hinder the both ends of series connection group；One end connection that the first resistor is not connect with the interlaminated resistance is publicly；First operation
The input anode of amplifier connect the first resistor not with described one end publicly connecting；The second operational amplifier
Input anode connect one end that the second resistance is not connect with the interlaminated resistance；The intermediate operations amplifier it is defeated
Enter proper pole and is sequentially connected the interlaminated resistance far from described one end publicly；The input terminal of all operational amplifiers is negative
The source electrode of pole and all metal-oxide-semiconductors connects publicly via the sampling resistor；The output end of first operational amplifier
Connect the grid of first metal-oxide-semiconductor；The output end of the second operational amplifier connects the grid of second metal-oxide-semiconductor；Institute
The output end for stating intermediate operations amplifier is sequentially connected the grid of the intermediate metal-oxide-semiconductor；One output end of the enabling unit
The input anode of the second operational amplifier is connected, another output end connects the drain electrode of first metal-oxide-semiconductor；Described
The drain electrode of one metal-oxide-semiconductor connects first power end；The drain electrode of second metal-oxide-semiconductor connects second power end；In described
Between the drain electrode of metal-oxide-semiconductor connect the middle power end according to order；The drain electrode of the intermediate metal-oxide-semiconductor is connected according to same order
The additional middle power end；It is described to be commonly connected in first ground terminal, the second ground terminal and third ground terminal
Arbitrary.
The invention also provides a kind of multi-chip parallel connection LED lighting circuits, including appoint at least two such as Claims 1-4
Linear constant current driving chip described in meaning one；The multi-chip parallel connection LED lighting circuit further includes power supply unit and luminous two
Pole pipe；The light emitting diode includes light emitting diode among the first light emitting diode, the second light emitting diode and at least one,
The intermediate light emitting diode quantity is equal with the intermediate metal-oxide-semiconductor quantity in each linear constant current driving chip；Institute
It states power supply unit and provides energy for the alternating current from alternating current to be changed into after direct current for the luminous of light emitting diode；It is described
Cathode and anode are interconnected to constitute hair successively for first light emitting diode, the intermediate diode, second light emitting diode
Optical diode series connection group, and first light emitting diode and second light emitting diode are located at light emitting diode series connection
The anode of the both ends of group, the cathode of first light emitting diode and one of them intermediate light emitting diode is connected, described
The anode of second light emitting diode is connected with the cathode of intermediate light emitting diode described in one of them；First Light-Emitting Diode
Anode connection said supply unit output head anode；First power end of the linear constant current driving chip is all connected with described
The cathode of first light emitting diode；Second power end of the linear constant current driving chip is all connected with second light emitting diode
Cathode；According to order, the middle power end of each linear constant current driving chip is sequentially connected next linear constant current and drives
Corresponding additional middle power end on dynamic chip；The cathode of the intermediate light emitting diode is sequentially connected the linear constant current driving
The corresponding middle power end of at least one or additional middle power end in chip；Each the linear constant current driving chip is arbitrary
A ground terminal is connected with each other by printing power ground, and the printing power ground is the circuit being printed on substrate, and passes through institute
State the bottom of linear constant current driving chip；The printing power ground is connected to the negative pole of output end of the power supply circuit.
Further, the cathode of the intermediate light emitting diode is sequentially connected right in the last one linear constant current driving chip
Corresponding additional middle power end in the middle power end answered or first linear constant current driving chip.
Further, said supply unit is the bridge rectifier of 4 diodes composition, and input terminal connects alternating current.
Compared with prior art, beneficial effects of the present invention are：Multi-chip parallel connection LED lighting circuit patch of the present invention is welded
When being connected on the same single side and covering on the aluminum substrate of copper, for various pieces connection without using wire jumper, reliability is high, and circuit letter
Single, at low cost, area is small.
Description of the drawings
Fig. 1 is the structural schematic diagram of existing multi-chip parallel connection LED lighting circuit；
Fig. 2 is the structural schematic diagram of linear constant current driving chip embodiment one of the present invention；
Fig. 3 is the structural schematic diagram of one linear constant current driving circuit of linear constant current driving chip embodiment of the present invention；
Fig. 4 is the structural schematic diagram of multi-chip parallel connection LED lighting circuit embodiment one of the present invention；
Fig. 5 is the structural schematic diagram of linear constant current driving chip embodiment two of the present invention；
Fig. 6 is the structural schematic diagram of linear constant current driving chip embodiment bilinear constant-current drive circuit of the present invention；
Fig. 7 is the structural schematic diagram of multi-chip parallel connection LED lighting circuit embodiment two of the present invention.
In reference numeral：11, the first pin；12, second pin；13, third pin；14, the 4th pin；15, the 5th draws
Foot；16, the 6th pin；17, the 7th pin；18, the 8th pin；19, the 9th pin；10, the tenth pin；2, metal base plate；3、
Linear constant current driving circuit；4, enabling unit；5, power ground is printed.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one
As shown in Fig. 2, linear constant current driving chip of the present invention includes 8 pins, metal base plate 2 and linear constant current driving electricity
Road 3.8 pins are symmetrically distributed in the both sides of metal base plate 2, and using wherein side as left side, the other side is right side, then are located at metal
4 pins in 2 left side of bottom plate are followed successively by the first pin 11, second pin 12, third pin 13 and the 4th pin 14 from top to bottom,
4 pins positioned at the right side of metal base plate 2 are followed successively by the 5th pin 15, the 6th pin 16, the 7th pin 17 and the from top to bottom
Eight pins 18.Linear constant current driving circuit 3 is fixed on metal base plate 2, and metal base plate 2 is exposed in linear constant-current driven chip
Outside.
As shown in figure 3, linear constant current driving circuit 3 includes control circuit M1, enabling unit 4 and 3 metal-oxide-semiconductors, 3 MOS
Pipe includes the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2 and intermediate metal-oxide-semiconductor Q3.Control circuit M1 includes 4 resistance and 3 operation amplifiers
Device, 4 resistance include that first resistor R1, second resistance R2, sampling resistor RCS and interlaminated resistance R3,3 operational amplifiers include
First operational amplifier OP1, second operational amplifier OP2 and intermediate operations amplifier OP3.First operational amplifier OP1, second
The input cathode and the first metal-oxide-semiconductor Q1 of operational amplifier OP2 and intermediate operations amplifier OP3, the second metal-oxide-semiconductor Q2 and centre
The source electrode of metal-oxide-semiconductor Q3 is connected to one end of sampling resistor RCS, and the other end of sampling resistor RCS connects publicly COM.First
The output end of operational amplifier OP1 connects the grid of the first metal-oxide-semiconductor Q1, and the output end connection of intermediate operations amplifier OP3 is intermediate
The grid of metal-oxide-semiconductor Q3, the output end of second operational amplifier OP2 connect the grid of the second metal-oxide-semiconductor Q2.The one end first resistor R1 connects
The input anode of the first operational amplifier OP1 is connect, the other end connects publicly COM；The first fortune of the one end interlaminated resistance R3 connection
The input anode of amplifier OP1 is calculated, the other end connects the input anode of intermediate operations amplifier OP3；Second resistance R2 mono-
The input anode of end connection intermediate operations amplifier OP3, the other end connect the input anode of second operational amplifier OP2.
The input anode of the output end connection second operational amplifier OP2 of enabling unit 3, another output end connection first
The drain electrode of metal-oxide-semiconductor Q1.
As shown in Figures 2 and 3, the drain electrode of the first metal-oxide-semiconductor Q1 connects the 8th pin 18 and is used as the first power end D1；It is intermediate
The drain electrode of metal-oxide-semiconductor Q3 connects the 7th pin 17 and is used as middle power end D3B, and the drain electrode of intermediate metal-oxide-semiconductor Q3 connects the first pin
11 are used as additional middle power end D3A；The drain electrode of second metal-oxide-semiconductor Q2 connects the 5th pin 15 and is used as the second power end D2；Linearly
The publicly COM connections metal base plate 2 of constant-current drive circuit 3 is used as the first ground terminal GND1；The public affairs of linear constant current driving circuit 3
COM is also connected with the 6th pin 16 and is used as the second ground terminal GND2 altogether；The publicly COM of linear constant current driving circuit 3 is also connected with
Third pin 13 is as third ground terminal GND3.
The voltage that enabling unit 4 provides is 3 electricity by concatenated first resistor R1, interlaminated resistance R3 and R2 points of second resistance
Signal is pressed, and the first operational amplifier OP1, intermediate operations amplifier OP3 and second operational amplifier OP2 is made to receive size not
Same voltage signal, control are flowed through via the first metal-oxide-semiconductor Q1, centre metal-oxide-semiconductor Q3 and the second metal-oxide-semiconductor Q2 on sampling resistor RCS
Current amplitude and priority are incremented by successively.
As shown in figure 4, including 3 linear constant current driving chips, 3 lines for multi-chip parallel connection LED lighting circuit of the present invention
Property constant-current driven chip be linear constant current driving chip proposed by the present invention, including the first driving chip U1, second driving core
Piece U2 and third driving chip U3.Multi-chip parallel connection LED lighting circuit of the present invention further includes that bridge rectifier DB and 3 shine
Diode, 3 light emitting diodes include the first Light-emitting diode LED 1,3 and second light emitting diode of intermediate Light-emitting diode LED
LED2.Bridge rectifier DB is the bridge rectifier of 4 diodes composition, and as power supply unit, input terminal connects city
Electric VAC, for being direct current by the AC conversion from alternating current VAC.The positive crossover formula of first Light-emitting diode LED 1 is whole
The output head anode of current circuit DB, the cathode of anode the first Light-emitting diode LED 1 of connection of intermediate Light-emitting diode LED 3, the
The cathode of Light-emitting diode LED 3 among the anode connection of two Light-emitting diode LED 2.First driving chip U1, the second driving core
The first power end D1 (i.e. the 8th pin 18) of piece U2 and third driving chip U3 is all connected with the negative of the first Light-emitting diode LED 1
Pole；The second power end D2 (i.e. the 5th pin 15) of first driving chip U1, the second driving chip U2 and third driving chip U3
It is all connected with the cathode of the second Light-emitting diode LED 2；The middle power end D3B (i.e. the 7th pin 17) of first driving chip U1 is even
Connect the additional middle power end D3A (i.e. the first pin 11) of the second driving chip U2, the middle power end of the second driving chip U2
The additional middle power end D3A (i.e. the first pin 11) of D3B (i.e. the 7th pin 17) connection third driving chips U3, and third is driven
The cathode of Light-emitting diode LED 3 among middle power end D3B (i.e. the 7th pin 17) connections of dynamic chip U3.First driving core
The first ground terminal GND1 (i.e. metal base plate 2), the second ground terminal of piece U1, the second driving chip U2 and third driving chip U3
GND2 (i.e. the 6th pin 16) and third ground terminal GND3 (i.e. third pin 13) is connected with each other by printing power ground 5, print
Power ground 5 processed is in the bottom of metal base plate 2, to be printed on the circuit on substrate, and is straight line, reduces printing power ground 5
The probability intersected with All other routes, printing power ground 5 drive core by the first driving chip U1, the second driving chip U2 and third
The bottom of piece U3.Printing power ground 5 is connected to the negative pole of output end of bridge rectifier DB, and is grounded.The multi-chip is in parallel
Circuit in LED illumination circuit does not intersect.
In view of the heat dissipation of light emitting diode and linear constant current driving chip, multi-chip parallel connection LED lighting circuit usually pastes
Piece is welded on the same single side and covers on the aluminum substrate of copper, as shown in figure 4, the circuit of multi-chip parallel connection LED lighting circuit of the present invention
Between there is no intersecting, various pieces connection is without using wire jumper, and reliability is high, and circuit is simple, at low cost, area
It is small.
Embodiment two
As shown in figure 5, linear constant current driving chip of the present invention includes 10 pins, metal base plate 2 and linear constant current driving
Circuit 3.10 pins are symmetrically distributed in the both sides of metal base plate 2, and using wherein side as left side, the other side is right side, then is located at
5 pins in 2 left side of metal base plate are followed successively by the first pin 11, second pin 12, third pin 13, the 4th pin from top to bottom
14 and the 5th pin 15,5 pins positioned at 19 right side of metal base plate be followed successively by the 6th pin 16, the 7th pin 17 from top to bottom
8th pin 18, the 9th pin 19 and the tenth pin 10.Linear constant current driving circuit 3 is fixed on metal base plate 2, and metal bottom
Plate 2 is exposed outside linear constant-current driven chip.
As shown in fig. 6, linear constant current driving circuit 3 includes control circuit M1, enabling unit 4 and 4 metal-oxide-semiconductors, 4 MOS
Pipe includes the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, the first intermediate intermediate metal-oxide-semiconductor Q4 of metal-oxide-semiconductor Q3 and second.Control circuit M1 includes
5 resistance and 4 operational amplifiers, 5 resistance include first resistor R1, second resistance R2, sampling resistor RCS, among first
Resistance R3 and the second interlaminated resistance R4,4 operational amplifiers include the first operational amplifier OP1, second operational amplifier OP2,
First intermediate operations amplifier OP3 and the second intermediate operations amplifier OP4.First operational amplifier OP1, second operational amplifier
The input cathode of OP2, the first intermediate operations amplifier OP3 and the second intermediate operations amplifier OP4 and the first metal-oxide-semiconductor Q1, the
Two metal-oxide-semiconductor Q2, the first intermediate intermediate metal-oxide-semiconductor Q4 of metal-oxide-semiconductor Q3 and second source electrode be connected to one end of sampling resistor RCS, adopt
Another termination of sample resistance RCS publicly COM.The output end of first operational amplifier OP1 connects the grid of the first metal-oxide-semiconductor Q1,
The output end of first intermediate operations amplifier OP3 connects the grid of the first intermediate metal-oxide-semiconductor Q3, the second intermediate operations amplifier OP4
Output end connect the grid of the second intermediate metal-oxide-semiconductor Q4, the output end of second operational amplifier OP2 connects the second metal-oxide-semiconductor Q2's
Grid.The one end first resistor R1 connects the input anode of the first operational amplifier OP1, and the other end connects publicly COM；First
The one end interlaminated resistance R3 connects the input anode of the first operational amplifier OP1, and the other end connects the first intermediate operations amplifier
The input anode of OP3；Second one end interlaminated resistance R4 connects the input anode of the first intermediate operations amplifier OP3, another
The input anode of the second intermediate operations amplifier OP4 of end connection；The one end second resistance R2 connects the second intermediate operations amplifier
The input anode of OP4, the other end connect the input anode of second operational amplifier OP2.One output end of enabling unit 4
The input anode of second operational amplifier OP3 is connected, another output end connects the drain electrode of the first metal-oxide-semiconductor Q1.
As shown in Figures 5 and 6, the drain electrode of the first metal-oxide-semiconductor Q1 connects the tenth pin 10 and is used as the first power end D1；In first
Between metal-oxide-semiconductor Q3 drain electrode connect the 7th pin 17 be used as the first middle power end D3B, and the first intermediate metal-oxide-semiconductor Q3 drain electrode connect
It connects third pin 13 and is used as the first additional middle power end D3A；The drain electrode of second intermediate metal-oxide-semiconductor Q4 connects 16 conduct of the 6th pin
Second middle power end D4B, and the drain electrode of the second intermediate metal-oxide-semiconductor Q4 connects the 4th pin 14 and is used as the second additional middle power end
D4A；The drain electrode of second metal-oxide-semiconductor Q2 connects the 5th pin 15 and is used as the second power end D2；Linear constant current driving circuit 3 is publicly
COM connections metal base plate 2 is used as the first ground terminal GND1；The publicly COM of linear constant current driving circuit 3 is also connected with the 9th pin
19 are used as the second ground terminal GND2；The publicly COM of linear constant current driving circuit 3 is also connected with second pin 12 and is grounded as third
Hold GND3.
Enabling unit 4 provide voltage by concatenated first resistor R1, the first interlaminated resistance R3, the second interlaminated resistance R4 and
R2 points of second resistance is 4 voltage signals, and is made in the first operational amplifier OP1, the first intermediate operations amplifier OP3, second
Between operational amplifier OP4 and second operational amplifier OP2 receive voltage signal of different sizes, make via the first metal-oxide-semiconductor Q1,
First intermediate metal-oxide-semiconductor Q3, the second intermediate metal-oxide-semiconductor Q4 and the second metal-oxide-semiconductor Q2 flow through current amplitude on sampling resistor RCS and preferential
Grade is incremented by.
As shown in fig. 7, including 3 linear constant current driving chips, 3 lines for multi-chip parallel connection LED lighting circuit of the present invention
Property constant-current driven chip be linear constant current driving chip proposed by the present invention, including the first driving chip U1, second driving core
Piece U2 and third driving chip U3.Multi-chip parallel connection LED lighting circuit of the present invention further includes that bridge rectifier DB and 4 shine
Diode, 4 light emitting diodes include the first Light-emitting diode LED 1, first the 3, second centre of intermediate Light-emitting diode LED hair
Optical diode LED4 and the second Light-emitting diode LED 2.Bridge rectifier DB is the bridge rectifier of 4 diodes composition,
As power supply unit, input terminal connects alternating current VAC, for being direct current by the AC conversion from alternating current VAC.First hair
The anode of optical diode LED1 connects the output head anode of bridge rectifier DB, and the anode of the first intermediate Light-emitting diode LED 3 is even
Connect the cathode of the first Light-emitting diode LED 1, anode the first intermediate light emitting diode of connection of the second intermediate Light-emitting diode LED 4
The cathode of LED3, the cathode of anode the second intermediate Light-emitting diode LED 4 of connection of the second Light-emitting diode LED 2.First driving
The first power end D1 (i.e. the tenth pin 10) of chip U1, the second driving chip U2 and third driving chip U3 are all connected with the first hair
The cathode of optical diode LED1；The second power end of first driving chip U1, the second driving chip U2 and third driving chip U3
D2 (i.e. the 5th pin 15) is all connected with the cathode of the second Light-emitting diode LED 2；The first middle power end of first driving chip U1
The first additional middle power end D3A (i.e. third pin 13) of the second driving chip U2 of D3B (i.e. the 7th pin 17) connections, second
The additional intermediate work(of the first of the first middle power end D3B (i.e. the 7th pin 17) connection third driving chips U3 of driving chip U2
Rate end D3A (i.e. third pin 13), and the first middle power end D3B (i.e. the 7th pin 17) connections of third driving chip U3
The cathode of one intermediate Light-emitting diode LED 3；The second middle power end D4B (i.e. the 6th pin 16) of first driving chip U1 is even
Connect the second additional middle power end D4A (i.e. the 4th pin 14) of the second driving chip U2, the second driving chip U2 second in
Between power end D4B (i.e. the 6th pin 16) connection third driving chips U3 the second additional middle power end D4A (i.e. the 4th pins
, and second middle power end D4B (i.e. the 6th pin 16) the second intermediate light emitting diodes of connection of third driving chip U3 14)
The cathode of LED4.The first ground terminal GND1 of first driving chip U1, the second driving chip U2 and third driving chip U3 are (i.e. golden
Belong to bottom plate 2), the second ground terminal GND2 (i.e. the 9th pin 19) and third ground terminal GND3 (i.e. second pin 12) pass through printing
Power ground 5 is connected with each other, and printing power ground 5 is in the bottom of metal base plate 2, to be printed on the circuit on substrate, and it is straight for one
Line reduces the probability that printing power ground 5 is intersected with All other routes, and printing power ground 5 is by the first driving chip U1, the second driving
The bottom of chip U2 and third driving chip U3.Printing power ground 5 is connected to the negative pole of output end of bridge rectifier DB, and connects
Ground.Circuit in the multi-chip parallel connection LED lighting circuit does not intersect.
In view of the heat dissipation of light emitting diode and linear constant current driving chip, multi-chip parallel connection LED lighting circuit usually pastes
Piece is welded on the same single side and covers on the aluminum substrate of copper, as shown in fig. 7, the circuit of multi-chip parallel connection LED lighting circuit of the present invention
Between there is no intersecting, various pieces connection is without using wire jumper, and reliability is high, and circuit is simple, at low cost, area
It is small.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of linear constant current driving chip, it is characterised in that：Including linear constant current driving circuit, metal base plate and at least eight
Pin；
The metal base plate is exposed on the outside of the linear constant current driving chip；
The pin is symmetrically distributed in the metal base plate both sides；
The pin includes the first power end, the second power end；
The pin further includes being arranged at least one middle power end of the metal base plate side, and be arranged in the metal
The additional middle power end of the identical quantity of the bottom plate other side；
The middle power end and the additional middle power end are corresponding described according to the identical one-to-one correspondence that puts in order
Middle power end and the additional middle power end are connected with each other；
First power end, the middle power end, second power end and the additional middle power end surround successively
The metal base plate arrangement.
2. a kind of linear constant current driving chip according to claim 1, it is characterised in that：
The metal base plate, positioned at middle power end side at least one pin and be located at the additional middle power end
At least one pin of side is respectively as the first, second, and third ground terminal.
3. a kind of linear constant current driving chip according to claim 2, it is characterised in that：
The middle power end and the additional middle power end are located at second ground terminal and the third ground terminal line
The same side；
First power end and the second power end are located at the not homonymy of second ground terminal and the third ground terminal line.
4. a kind of linear constant current driving chip according to claim 1, it is characterised in that：The linear constant current driving circuit
Including enabling unit, control circuit and at least one metal-oxide-semiconductor；
The metal-oxide-semiconductor includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor and at least one centre metal-oxide-semiconductor；
The control circuit includes resistance and operational amplifier；
The resistance includes first resistor, second resistance, sampling resistor and at least one interlaminated resistance；
The operational amplifier includes the first operational amplifier, second operational amplifier and at least one intermediate operations amplifier；
The first resistor, the interlaminated resistance and the second resistance are serially connected, and constitute resistance series connection group, first electricity
Resistance and the second resistance are located at the both ends of the resistance series connection group；
One end connection that the first resistor is not connect with the interlaminated resistance is publicly；
The input anode of first operational amplifier connect the first resistor not with described one end publicly connecting；
The input anode of the second operational amplifier connects one end that the second resistance is not connect with the interlaminated resistance；
The input anode of the intermediate operations amplifier is sequentially connected the interlaminated resistance far from described one end publicly；
The source electrode of the input cathode of all operational amplifiers and all metal-oxide-semiconductors connects public affairs via the sampling resistor
Altogether；
The output end of first operational amplifier connects the grid of first metal-oxide-semiconductor；
The output end of the second operational amplifier connects the grid of second metal-oxide-semiconductor；
The output end of the intermediate operations amplifier is sequentially connected the grid of the intermediate metal-oxide-semiconductor；
One output end of the enabling unit connects the input anode of the second operational amplifier, another output end connects
Connect the drain electrode of first metal-oxide-semiconductor；
The drain electrode of first metal-oxide-semiconductor connects first power end；
The drain electrode of second metal-oxide-semiconductor connects second power end；
The drain electrode of the intermediate metal-oxide-semiconductor connects the middle power end according to order；
The drain electrode of the intermediate metal-oxide-semiconductor connects the additional middle power end according to same order；
Arbitrary be commonly connected in first ground terminal, the second ground terminal and third ground terminal.
5. a kind of multi-chip parallel connection LED lighting circuit, it is characterised in that：Including any one at least two such as Claims 1-4
Linear constant current driving chip described in；
The multi-chip parallel connection LED lighting circuit further includes power supply unit and light emitting diode；
The light emitting diode includes the first light emitting diode, the second light emitting diode and at least one centre light emitting diode, institute
It is equal with the intermediate metal-oxide-semiconductor quantity in each linear constant current driving chip to state intermediate light emitting diode quantity；
Said supply unit is used to the alternating current from alternating current be changed into after direct current provides energy for the luminous of light emitting diode
Amount；
Cathode is mutually interconnected with positive successively for first light emitting diode, the intermediate diode, second light emitting diode
It connects and constitutes light emitting diode series connection group, and first light emitting diode and second light emitting diode are located at described luminous two
The both ends of pole pipe series connection group, the positive phase of the cathode of first light emitting diode and one of them intermediate light emitting diode
Even, the anode of second light emitting diode is connected with the cathode of intermediate light emitting diode described in one of them；
The output head anode of the anode connection said supply unit of first Light-Emitting Diode；
First power end of the linear constant current driving chip is all connected with the cathode of first light emitting diode；
Second power end of the linear constant current driving chip is all connected with the cathode of second light emitting diode；
According to order, the middle power end of each linear constant current driving chip is sequentially connected next linear constant current driving core
The corresponding additional middle power end of on piece；
The cathode of the intermediate light emitting diode is sequentially connected the corresponding intermediate work(of at least one in the linear constant current driving chip
Rate end or additional middle power end；
Arbitrary a ground terminal of each linear constant current driving chip is connected with each other by printing power ground, the printing electricity
It is source the circuit being printed on substrate, and by the bottom of the linear constant current driving chip；
The printing power ground is connected to the negative pole of output end of the power supply circuit.
6. a kind of multi-chip parallel connection LED lighting circuit according to claim 5, it is characterised in that：The centre luminous two
The cathode of pole pipe is sequentially connected corresponding middle power end or first linear constant current in the last one linear constant current driving chip
Corresponding additional middle power end in driving chip.
7. a kind of multi-chip parallel connection LED lighting circuit according to claim 5, it is characterised in that：Said supply unit is 4
The bridge rectifier of a diode composition, and input terminal connects alternating current.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010644312.1A CN111935874B (en) | 2018-04-20 | 2018-04-20 | Linear constant current driving chip and multi-chip parallel LED lighting circuit |
| CN201810360250.4A CN108366462B (en) | 2018-04-20 | 2018-04-20 | Linear constant-current driving chip and multi-chip parallel LED lighting circuit |
| PCT/CN2019/083364 WO2019201327A1 (en) | 2018-04-20 | 2019-04-19 | Linear constant current drive chip and multi-chip parallel led lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360250.4A CN108366462B (en) | 2018-04-20 | 2018-04-20 | Linear constant-current driving chip and multi-chip parallel LED lighting circuit |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010644312.1A Division CN111935874B (en) | 2018-04-20 | 2018-04-20 | Linear constant current driving chip and multi-chip parallel LED lighting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108366462A true CN108366462A (en) | 2018-08-03 |
| CN108366462B CN108366462B (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810360250.4A Active CN108366462B (en) | 2018-04-20 | 2018-04-20 | Linear constant-current driving chip and multi-chip parallel LED lighting circuit |
| CN202010644312.1A Active CN111935874B (en) | 2018-04-20 | 2018-04-20 | Linear constant current driving chip and multi-chip parallel LED lighting circuit |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010644312.1A Active CN111935874B (en) | 2018-04-20 | 2018-04-20 | Linear constant current driving chip and multi-chip parallel LED lighting circuit |
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| Country | Link |
|---|---|
| CN (2) | CN108366462B (en) |
| WO (1) | WO2019201327A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019201327A1 (en) * | 2018-04-20 | 2019-10-24 | 上海路傲电子科技有限公司 | Linear constant current drive chip and multi-chip parallel led lighting circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019201327A1 (en) | 2019-10-24 |
| CN111935874A (en) | 2020-11-13 |
| CN108366462B (en) | 2020-08-21 |
| CN111935874B (en) | 2023-09-05 |
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Application publication date: 20180803 Assignee: Shanghai Kaiti Electronic Technology Co.,Ltd. Assignor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Contract record no.: X2022310000019 Denomination of invention: A linear constant current drive chip and multi chip parallel LED lighting circuit Granted publication date: 20200821 License type: Common License Record date: 20220613 |