CN107071980A - Multichannel LED drive circuit - Google Patents
Multichannel LED drive circuit Download PDFInfo
- Publication number
- CN107071980A CN107071980A CN201710316053.8A CN201710316053A CN107071980A CN 107071980 A CN107071980 A CN 107071980A CN 201710316053 A CN201710316053 A CN 201710316053A CN 107071980 A CN107071980 A CN 107071980A
- Authority
- CN
- China
- Prior art keywords
- led
- input
- branch roads
- voltage source
- led branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Abstract
The present invention provides a kind of multichannel LED drive circuit, and the multipath LED drive circuit includes：Constant voltage source, at least one the first LED branch road, at least one the 2nd LED branch road and the corresponding positive voltage source of each 2nd LED branch roads；The pressure drop of first LED branch roads is less than predetermined threshold value；The pressure drop of 2nd LED branch roads is more than predetermined threshold value；Wherein, the positive pole of constant voltage source is connected with the input of the first LED branch roads and the negative pole of positive voltage source respectively；The negative pole ground connection of constant voltage source；The output head grounding of first LED branch roads；The positive pole of positive voltage source is connected with the input of the 2nd LED branch roads, the output head grounding of the 2nd LED branch roads, and positive voltage source is used to provide offset voltage for the 2nd LED branch roads.The multichannel LED drive circuit that the present invention is provided, while pressure drop less LED branch roads power consumption is not influenceed, realizes the normal work of the larger LED branch roads of pressure drop.
Description
Technical field
The present invention relates to LED technology field, more particularly to a kind of multichannel LED drive circuit.
Background technology
Light emitting diode (Light Emitting Diode, abbreviation LED) light fixture has long lifespan, light efficiency height, shock resistance, low
The advantages of energy consumption, belong to the energy-conserving and environment-protective illumination of green, oneself is widely used in illumination and furnishing fields.For example, LED multi-path can be with
Realize different-colour lamp bead.
For LED multi-path, typically using dc source-dc source (Direct Current-Direct
Current abbreviation DC-DC) constant voltage circuit and linear circuit drive LED multi-path, and the constant voltage circuit is respectively every LED branch road
Predeterminated voltage is inputted, but because the pressure drop of every LED branch road is different, the larger LED branch roads of pressure drop then cisco unity malfunction.In order to
Enable the branch paths of LEDs normal work that pressure drop is larger, be the larger branch of pressure drop by increasing the voltage of constant pressure source in the prior art
Road provides offset voltage, using this sample loading mode simultaneously, although can cause the LED branch road normal works that pressure drop is larger, but can lead
Cause the less branch road power consumption increase of pressure drop.
The content of the invention
The present invention provides a kind of multichannel LED drive circuit, is not influenceing the less LED branch roads power consumption of pressure drop
While, realize the normal work of the larger LED branch roads of pressure drop.
The embodiment of the present invention provides a kind of multichannel LED drive circuit, including：
Constant voltage source, at least one the first LED branch road, at least one the 2nd LED branch road and each 2nd LED branch roads pair
The positive voltage source answered；The pressure drop of the first LED branch roads is less than predetermined threshold value；The pressure drop of the 2nd LED branch roads is more than default
Threshold value；
Wherein, the positive pole of the constant voltage source respectively with the inputs of the first LED branch roads and the positive voltage source
Negative pole is connected；The negative pole ground connection of the constant voltage source；The output head grounding of the first LED branch roads；The positive voltage source is just
Pole is connected with the input of the 2nd LED branch roads, and the output head grounding of the 2nd LED branch roads, the positive voltage source is used for
Offset voltage is provided for the 2nd LED branch roads.
In an embodiment of the present invention, the first LED branch roads include：First LED and the first constant current drive sub-circuits；
Wherein, the input of the first LED is connected with the positive pole of the constant voltage source；The output end of first LED
It is connected with the input of the first constant current drive sub-circuits, the output head grounding of the first constant current drive sub-circuits.
In an embodiment of the present invention, the 2nd LED branch roads include：2nd LED and the second constant current drive sub-circuits；
Wherein, the input of the 2nd LED is connected with the positive pole of the positive voltage source；The output end of 2nd LED
It is connected with the input of the second constant current drive sub-circuits, the input end grounding of the second constant current drive sub-circuits.
In an embodiment of the present invention, the first constant current drive sub-circuits include the first operational amplifier, the first NPN tri-
Pole pipe and first resistor；
Wherein, the positive input of first operational amplifier inputs the first reference voltage, first operation amplifier
The reverse input end of device is connected with the input of the first resistor, the output head grounding of the first resistor；First electricity
Emitter-base bandgap grading of the input of resistance also with first NPN triode is connected, the base stage of first NPN triode and the described first fortune
The output end connection of amplifier is calculated, the collector of first NPN triode is connected with the output end of the first LED.
In an embodiment of the present invention, the second constant current drive sub-circuits include the second operational amplifier, the 2nd NPN tri-
Pole pipe and second resistance；
Wherein, the positive input of second operational amplifier inputs the second reference voltage, second operation amplifier
The reverse input end of device is connected with the input of the second resistance, the output head grounding of the second resistance；Second electricity
Emitter-base bandgap grading of the input of resistance also with second NPN triode is connected, the base stage of second NPN triode and the described second fortune
The output end connection of amplifier is calculated, the collector of second NPN triode is connected with the output end of the 2nd LED.
The embodiment of the present invention also provides a kind of multichannel LED drive circuit, including：
Constant voltage source, at least one the first LED branch road, at least one the 2nd LED branch road and each 2nd LED branch roads pair
The negative voltage source answered；The pressure drop of the first LED branch roads is less than predetermined threshold value；The pressure drop of the 2nd LED branch roads is more than default
Threshold value；
Wherein, the input and the 2nd LED branch roads of the positive pole of the constant voltage source respectively with the first LED branch roads
Input connection；The negative pole ground connection of the constant voltage source；The output head grounding of the first LED branch roads；The 2nd LED branch
The output end on road is connected with the negative pole of the negative voltage source, the plus earth of the negative voltage source, and the negative voltage source is for being
The 2nd LED branch roads provide offset voltage.
In an embodiment of the present invention, the first LED branch roads include：First LED and the first constant current drive sub-circuits；
Wherein, the input of the first LED is connected with the positive pole of the constant voltage source；The output end of first LED
It is connected with the input of the first constant current drive sub-circuits, the output head grounding of the first constant current drive sub-circuits.
In an embodiment of the present invention, the 2nd LED branch roads include：2nd LED and the second constant current drive sub-circuits；
Wherein, the input of the 2nd LED is connected with the positive pole of the constant voltage source；The output end of 2nd LED
It is connected with the input of the second constant current drive sub-circuits, output end and the negative electricity of the second constant current drive sub-circuits
The negative pole connection of potential source.
In an embodiment of the present invention, the first constant current drive sub-circuits include the first operational amplifier, the first NPN tri-
Pole pipe and first resistor；
Wherein, the positive input of first operational amplifier inputs the first reference voltage, first operation amplifier
The reverse input end of device is connected with the input of the first resistor, the output head grounding of the first resistor；First electricity
Emitter-base bandgap grading of the input of resistance also with first NPN triode is connected, the base stage of first NPN triode and the described first fortune
The output end connection of amplifier is calculated, the collector of first NPN triode is connected with the output end of the first LED.
In an embodiment of the present invention, the second constant current drive sub-circuits include the second operational amplifier, the 2nd NPN tri-
Pole pipe and second resistance；
Wherein, the positive input of second operational amplifier inputs the second reference voltage, second operation amplifier
The reverse input end of device is connected with the input of the second resistance, the output end of the second resistance and the negative voltage source
Negative pole is connected；Emitter-base bandgap grading of the input of the second resistance also with second NPN triode is connected, the poles of the 2nd NPN tri-
The base stage of pipe is connected with the output end of second operational amplifier, the collector of second NPN triode and the 2nd LED
Output end connection.
Multichannel LED drive circuit provided in an embodiment of the present invention, including：At least one the first LED branch road,
At least one the 2nd LED branch road and the corresponding positive voltage source of each 2nd LED branch roads；Wherein, the positive pole of constant voltage source is respectively with
The negative pole connection of the input and positive voltage source of one LED branch roads；The negative pole ground connection of constant voltage source；The output end of first LED branch roads
Ground connection；The positive pole of positive voltage source is connected with the input of the 2nd LED branch roads, the output head grounding of the 2nd LED branch roads, positive voltage source
For providing offset voltage for the 2nd LED branch roads.As can be seen here, multipath LED drive circuit provided in an embodiment of the present invention, passes through
By the connection of the negative pole of the input of the first LED branch roads and positive voltage source, by the input of the 2nd LED branch roads and positive voltage source
Positive pole is connected so that for the 2nd larger LED branch roads of pressure drop offset voltage can be provided by the positive voltage source, so that in not shadow
While ringing pressure drop less LED branch roads power consumption, the normal work of the larger LED branch roads of pressure drop is realized.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to do one simply to introduce, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of multichannel LED drive circuit provided in an embodiment of the present invention；
Fig. 2 is the structural representation of another multichannel LED drive circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of structural representation of multichannel LED drive circuit provided in an embodiment of the present invention；
Fig. 4 is the structural representation of another multichannel LED drive circuit provided in an embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Term " first ", " second ", " the 3rd " in description and claims of this specification and above-mentioned accompanying drawing, "
The (if present)s such as four " are for distinguishing similar object, without for describing specific order or precedence.It should manage
The data that solution is so used can be exchanged in the appropriate case, so as to embodiments of the invention described herein, for example can be with
Order in addition to those for illustrating or describing herein is implemented.In addition, term " comprising " and " having " and their times
What is deformed, it is intended that covering is non-exclusive to be included, for example, contain the process of series of steps or unit, method, system,
Product or equipment are not necessarily limited to those steps clearly listed or unit, but may include not list clearly or for
The intrinsic other steps of these processes, method, product or equipment or unit.
It should be noted that these specific embodiments can be combined with each other below, for same or analogous concept
Or process may be repeated no more in certain embodiments.
Fig. 1 is a kind of structural representation of multichannel LED drive circuit 10 provided in an embodiment of the present invention, when
So, the embodiment of the present invention is simply illustrated by taking Fig. 1 as an example, but does not represent that present invention is limited only by this.Refer to Fig. 1 institutes
Show, the multipath LED drive circuit 10 can include：
Constant voltage source 101, at least one the first LED branch road 102, at least one the 2nd LED branch road 103 and each 2nd LED
The corresponding positive voltage source 104 of branch road 103；The pressure drop of first LED branch roads 102 is less than predetermined threshold value；The pressure of 2nd LED branch roads 103
Drop is more than predetermined threshold value.
Wherein, the input and the negative pole of positive voltage source 104 of the positive pole of constant voltage source 101 respectively with the first LED branch roads 102
Connection；The negative pole ground connection of constant voltage source 101；The output head grounding of first LED branch roads 102；The positive pole of positive voltage source 104 and second
The input connection of LED branch roads 103, the output head grounding of the 2nd LED branch roads 103, positive voltage source 104 is used to be the 2nd LED branch
Road 103 provides offset voltage.
In embodiments of the present invention, the number of the first LED branch roads 102 and the 2nd LED branch roads 103 can be 1, or
2, it is of course also possible to be 3, it can specifically be configured according to actual needs, here, the embodiment of the present invention is simply with the first LED
The number of the LED branch roads 103 of branch road 102 and the 2nd is to illustrate exemplified by 1, but does not represent that present invention is limited only by this.Its
In, for each the first LED branch road 102, it is correspondingly arranged on positive voltage source 104.
Wherein, predetermined threshold value can be configured according to actual needs.Generally when LED dispatches from the factory, its corresponding specifications
It is middle to record the pressure drop scope that the LED normal works are allowed., should if the pressure drop of a certain LED branch roads is more than predetermined threshold value
The pressure drop of LED branch roads is larger, can influence the normal work of the LED branch roads.If the pressure drop of the LED branch roads is less than predetermined threshold value,
The pressure drop of the LED branch roads is smaller, now, does not interfere with the normal work of the LED branch roads.
Example, in embodiments of the present invention, the pressure drop of the first LED branch roads 102 is less than predetermined threshold value；2nd LED branch roads
103 pressure drop is more than predetermined threshold value, then the pressure drop of the first LED branch roads 102 is larger, and the pressure drop of the 2nd LED branch roads 103 is smaller.
As can be seen here, by being connected by the input of the first LED branch roads 102 with the negative pole of positive voltage source 104, by second
The input of LED branch roads 103 is connected with the positive pole of positive voltage source 104 so that can be that pressure drop is larger by the positive voltage source 104
The 2nd LED branch roads 103 offset voltage is provided so that while pressure drop less first LED, 102 power consumptions of branch road are not influenceed,
Realize the normal work of the 2nd larger LED branch roads 103 of pressure drop.
Multipath LED drive circuit 10 provided in an embodiment of the present invention, including：Constant voltage source 101, at least one the first LED
Branch road 102, at least one the 2nd LED branch road 103 and the corresponding positive voltage source 104 of each 2nd LED branch roads 103；Wherein, constant pressure electricity
The positive pole in source 101 is connected with the input of the first LED branch roads 102 and the negative pole of positive voltage source 104 respectively；Constant voltage source 101
Negative pole is grounded；The output head grounding of first LED branch roads 102；The input of the positive pole of positive voltage source 104 and the 2nd LED branch roads 103
Connection, the output head grounding of the 2nd LED branch roads 103, positive voltage source 104 is used to provide offset voltage for the 2nd LED branch roads 103.
As can be seen here, multipath LED drive circuit 10 provided in an embodiment of the present invention, by by the input of the first LED branch roads 102 with
The negative pole connection of positive voltage source 104, the input of the 2nd LED branch roads 103 is connected with the positive pole of positive voltage source 104 so that can
To be that the 2nd larger LED branch roads 103 of pressure drop provide offset voltage by the positive voltage source 104, so as to not influence the first LED
While 102 power consumption of branch road, the normal work of the 2nd LED branch roads 103 is realized.
Further, shown in Figure 2 based on the corresponding embodiments of Fig. 1, Fig. 2 is provided in an embodiment of the present invention another
A kind of structural representation of multichannel LED drive circuit 10, the multipath LED drive circuit 10 can also include：
First LED branch roads 102 include：First LED1021 and the first constant current drive sub-circuits.Wherein, the first LED1021
Input is connected with the positive pole of constant voltage source 101；The input of first LED1021 output end and the first constant current drive sub-circuits
Connection, the output head grounding of the first constant current drive sub-circuits.
Further, the first constant current drive sub-circuits can include the first operational amplifier 1022, the first NPN triode
1023 and first resistor 1024.Wherein, the positive input of the first operational amplifier 1022 inputs the first reference voltage, the first fortune
The reverse input end for calculating amplifier 1022 is connected with the input of first resistor 1024, the output head grounding of first resistor 1024；
Emitter-base bandgap grading of the input of first resistor 1024 also with the first NPN triode 1023 is connected, the base stage of the first NPN triode 1023 with
The output end connection of first operational amplifier 1022, the collector of the first NPN triode 1023 connects with the first LED1021 output end
Connect.
It should be noted that the first operational amplifier 1022 can also have with other error enlarging function circuit or
Element is replaced, and the embodiment of the present invention is simply illustrated by taking the first operational amplifier 1022 as an example, but does not represent the present invention only
It is confined to this.
In addition, the first NPN triode 1023 can also be replaced with the first metal-oxide-semiconductor, the embodiment of the present invention is simply with the first NPN
Illustrated exemplified by triode 1023, but do not represent that present invention is limited only by this.Example, when the first constant current drive sub-circuits
During including the first operational amplifier 1022, the first metal-oxide-semiconductor and first resistor 1024, the positive input of the first operational amplifier 1022
The first reference voltage of end input, the reverse input end of the first operational amplifier 1022 is connected with the input of first resistor 1024,
The output head grounding of first resistor 1024；Source electrode of the input of first resistor 1024 also with the first metal-oxide-semiconductor is connected, the first MOS
The grid of pipe is connected with the output end of the first operational amplifier 1022, the drain electrode of the first metal-oxide-semiconductor and the first LED1021 output end
Connection.
Optionally, the 2nd LED branch roads 103 include：2nd LED1031 and the second constant current drive sub-circuits.Wherein, second
LED1031 input is connected with the positive pole of positive voltage source 104；2nd LED1031 output end and the second constant current driving son electricity
The input connection on road, the input end grounding of the second constant current drive sub-circuits.
Further, the second constant current drive sub-circuits can include the second operational amplifier 1032, the second NPN triode
1033 and second resistance 1034.Wherein, the positive input of the second operational amplifier 1032 inputs the second reference voltage, the second fortune
The reverse input end for calculating amplifier 1032 is connected with the input of second resistance 1034, the output head grounding of second resistance 1034；
Emitter-base bandgap grading of the input of second resistance 1034 also with the second NPN triode 1033 is connected, the base stage of the second NPN triode 1033 with
The output end connection of second operational amplifier 1032, the collector of the second NPN triode 1033 connects with the 2nd LED1031 output end
Connect.
Likewise, the second operational amplifier 1032 can also have circuit or the element generation of error enlarging function with other
Replace, the embodiment of the present invention simply illustrated by taking the second operational amplifier 1032 as an example, but do not represent present invention is limited only by
This.
In addition, the second NPN triode 1033 can also be replaced with the second metal-oxide-semiconductor, the embodiment of the present invention is simply with the 2nd NPN
Illustrated exemplified by triode 1033, but do not represent that present invention is limited only by this.Example, when the second constant current drive sub-circuits
During including the second operational amplifier 1032, the second metal-oxide-semiconductor and second resistance 1034, second operational amplifier 1032 it is positive defeated
Enter the second reference voltage of end input, the reverse input end of the second operational amplifier 1032 connects with the input of second resistance 1034
Connect, the output head grounding of second resistance 1034；Source of the input of second resistance 1034 also with the second metal-oxide-semiconductor is connected, the 2nd MOS
The grid of pipe is connected with the output end of the second operational amplifier 1032, the drain electrode of the second metal-oxide-semiconductor and the 2nd LED1031 output end
Connection.
In actual application, it is assumed that the voltage of the offer of constant voltage source 101 is V, the voltage that positive voltage source 104 is provided
For V1, the first reference voltage of the first operational amplifier 1022 is V2, the second reference voltage V 3 of the second operational amplifier 1032,
Wherein, the first operational amplifier 1022, the first NPN triode 1023 and first resistor 1024 constitute a negative-feedback circuit, the
Two operational amplifiers 1032, the second NPN triode 1033 and second resistance 1034 constitute a negative-feedback circuit, negative-feedback circuit
In the first operational amplifier 1022 reverse input end voltage be equal to operational amplifier positive input voltage, negative-feedback
The voltage of the reverse input end of the second operational amplifier 1032 is equal to the voltage of the positive input of operational amplifier in circuit, the
One resistance 1024R1 is used for the electric current for detecting the first LED1021, and second resistance 1034R2 is used for the electricity for detecting the 2nd LED1031
Stream, by the way that the first LED1021 input is connected with the negative pole of positive voltage source 104, the positive pole of positive voltage source 104 and second
LED1031 input connection, then now the first LED1021 pressure drop is V, the first LED1021 electric currents I1=V2/R1；Second
The pressure drop of LED branch roads 103 is V+V1, the 2nd LED1031 electric currents I2=V3/R2, it can be seen that, it is provided in an embodiment of the present invention many
Paths of LEDs drive circuit 10, while pressure drop less LED branch roads power consumption is not influenceed, is realizing the larger LED branch roads of pressure drop just
Often work.
Fig. 3 is a kind of structural representation of multichannel LED drive circuit 10 provided in an embodiment of the present invention, when
So, the embodiment of the present invention is simply illustrated by taking Fig. 3 as an example, but does not represent that present invention is limited only by this.Refer to Fig. 3 institutes
Show, the multipath LED drive circuit 10 can include：
Constant voltage source 101, at least one the first LED branch road 102, at least one the 2nd LED branch road 103 and each 2nd LED
The corresponding negative voltage source 105 of branch road 103；The pressure drop of first LED branch roads 102 is less than predetermined threshold value；The pressure of 2nd LED branch roads 103
Drop is more than predetermined threshold value.
Wherein, the positive pole of constant voltage source 101 respectively with the inputs of the first LED branch roads 102 and the 2nd LED branch roads 103
Input is connected；The negative pole ground connection of constant voltage source 101；The output head grounding of first LED branch roads 102；2nd LED branch roads 103
Output end is connected with the negative pole of negative voltage source 105, the plus earth of negative voltage source 105, and negative voltage source 105 is used to be the 2nd LED
Branch road 103 provides offset voltage.
In embodiments of the present invention, the number of the first LED branch roads 102 and the 2nd LED branch roads 103 can be 1, or
2, it is of course also possible to be 3, it can specifically be configured according to actual needs, here, the embodiment of the present invention is simply with the first LED
The number of the LED branch roads 103 of branch road 102 and the 2nd is to illustrate exemplified by 1, but does not represent that present invention is limited only by this.Its
In, for each the first LED branch road 102, it is correspondingly arranged on negative voltage source 105.
Wherein, predetermined threshold value can be configured according to actual needs.Generally when LED dispatches from the factory, its corresponding specifications
It is middle to record the pressure drop scope that the LED normal works are allowed., should if the pressure drop of a certain LED branch roads is more than predetermined threshold value
The pressure drop of LED branch roads is larger, can influence the normal work of the LED branch roads.If the pressure drop of the LED branch roads is less than predetermined threshold value,
The pressure drop of the LED branch roads is smaller, now, does not interfere with the normal work of the LED branch roads.
Example, in embodiments of the present invention, the pressure drop of the first LED branch roads 102 is less than predetermined threshold value；2nd LED branch roads
103 pressure drop is more than predetermined threshold value, then the pressure drop of the first LED branch roads 102 is larger, and the pressure drop of the 2nd LED branch roads 103 is smaller.
As can be seen here, by the way that the output end of the 2nd LED branch roads 103 is connected with the negative pole of negative voltage source 105 so that can be with
It is that the 2nd larger LED branch roads 103 of pressure drop provide offset voltage by the negative voltage source 105, so as to not influence pressure drop smaller
The first LED 102 power consumptions of branch road while, realize the normal work of the 2nd larger LED branch roads 103 of pressure drop.
Multipath LED drive circuit 10 provided in an embodiment of the present invention, including：Constant voltage source 101, at least one the first LED
Branch road 102, at least one the 2nd LED branch road 103 and the corresponding negative voltage source 105 of each 2nd LED branch roads 103；Wherein, constant pressure electricity
The positive pole in source 101 is connected with the input of the first LED branch roads 102 and the input of the 2nd LED branch roads 103 respectively；Constant voltage source
101 negative pole ground connection；The output head grounding of first LED branch roads 102；The output end of 2nd LED branch roads 103 and negative voltage source 105
Negative pole connection, the plus earth of negative voltage source 105, negative voltage source 105 be used for for the 2nd LED branch roads 103 provide offset voltage.
As can be seen here, multipath LED drive circuit 10 provided in an embodiment of the present invention, by by the output end of the 2nd LED branch roads 103 with it is negative
The negative pole connection of voltage source 105 so that can be that the 2nd larger LED branch roads 103 of pressure drop provide benefit by the negative voltage source 105
Voltage is repaid, so as to while the first LED 102 power consumptions of branch road are not influenceed, realize the normal work of the 2nd LED branch roads 103.
Further, shown in Figure 4 based on the corresponding embodiments of Fig. 3, Fig. 4 is provided in an embodiment of the present invention another
A kind of structural representation of multichannel LED drive circuit 10, the multipath LED drive circuit 10 can also include：
Optionally, the first LED branch roads 102 include：First LED1021 and the first constant current drive sub-circuits.Wherein, first
LED1021 input is connected with the positive pole of constant voltage source 101；First LED1021 output end and the first constant current driving son electricity
The input connection on road, the output head grounding of the first constant current drive sub-circuits.
Further, the first constant current drive sub-circuits include the first operational amplifier 1022, the and of the first NPN triode 1023
First resistor 1024；Wherein, the positive input of the first operational amplifier 1022 inputs the first reference voltage, the first operation amplifier
The reverse input end of device 1022 is connected with the input of first resistor 1024, the output head grounding of first resistor 1024；First electricity
Emitter-base bandgap grading of the input of resistance 1024 also with the first NPN triode 1023 is connected, the base stage of the first NPN triode 1023 and the first fortune
The output end connection of amplifier 1022 is calculated, the collector of the first NPN triode 1023 is connected with the first LED1021 output end.
It should be noted that the first operational amplifier 1022 can also have with other error enlarging function circuit or
Element is replaced, and the embodiment of the present invention is simply illustrated by taking the first operational amplifier 1022 as an example, but does not represent the present invention only
It is confined to this.
In addition, the first NPN triode 1023 can also be replaced with the first metal-oxide-semiconductor, the embodiment of the present invention is simply with the first NPN
Illustrated exemplified by triode 1023, but do not represent that present invention is limited only by this.Example, when the first constant current drive sub-circuits
During including the first operational amplifier 1022, the first metal-oxide-semiconductor and first resistor 1024, first operational amplifier 1022 it is positive defeated
Enter the first reference voltage of end input, the reverse input end of the first operational amplifier 1022 connects with the input of first resistor 1024
Connect, the output head grounding of first resistor 1024；Source electrode of the input of first resistor 1024 also with the first metal-oxide-semiconductor is connected, and first
The grid of metal-oxide-semiconductor is connected with the output end of the first operational amplifier 1022, and draining for the first metal-oxide-semiconductor is defeated with the first LED1021
Go out end connection.
Optionally, the 2nd LED branch roads 103 include：2nd LED1031 and the second constant current drive sub-circuits.Wherein, second
LED1031 input is connected with the positive pole of constant voltage source 101；2nd LED1031 output end and the second constant current driving son electricity
The input connection on road, the output end of the second constant current drive sub-circuits is connected with the negative pole of negative voltage source 105.
Further, the second constant current drive sub-circuits include the second operational amplifier 1032, the and of the second NPN triode 1033
Second resistance 1034；Wherein, the positive input of the second operational amplifier 1032 inputs the second reference voltage, the second operation amplifier
The reverse input end of device 1032 is connected with the input of second resistance 1034, the output end and negative voltage source of second resistance 1034
105 negative pole connection；Emitter-base bandgap grading of the input of second resistance 1034 also with the second NPN triode 1033 is connected, the poles of the 2nd NPN tri-
The base stage of pipe 1033 is connected with the output end of the second operational amplifier 1032, the collector and second of the second NPN triode 1033
LED1031 output end connection.
Likewise, the second operational amplifier 1032 can also have circuit or the element generation of error enlarging function with other
Replace, the embodiment of the present invention simply illustrated by taking the second operational amplifier 1032 as an example, but do not represent present invention is limited only by
This.
In addition, the second NPN triode 1033 can also be replaced with the second metal-oxide-semiconductor, the embodiment of the present invention is simply with the 2nd NPN
Illustrated exemplified by triode 1033, but do not represent that present invention is limited only by this.Example, when the second constant current drive sub-circuits
During including the second operational amplifier 1032, the second metal-oxide-semiconductor and second resistance 1034, second operational amplifier 1032 it is positive defeated
Enter the second reference voltage of end input, the reverse input end of the second operational amplifier 1032 connects with the input of second resistance 1034
Connect, the output end of second resistance 1034 is connected with the negative pole of negative voltage source 105；The input of second resistance 1034 is also with second
The source electrode connection of metal-oxide-semiconductor, the grid of the second metal-oxide-semiconductor is connected with the output end of the second operational amplifier 1032, the leakage of the second metal-oxide-semiconductor
Pole is connected with the 2nd LED1031 output end.
In actual application, it is also assumed that the voltage of the offer of constant voltage source 101 is V, what negative voltage source 105 was provided
Voltage is V4, and the first reference voltage of the first operational amplifier 1022 is V2, the second benchmark electricity of the second operational amplifier 1032
V3 is pressed, wherein, the first operational amplifier 1022, the first NPN triode 1023 and first resistor 1024 constitute a negative-feedback electricity
Road, the second operational amplifier 1032, the second NPN triode 1033 and second resistance 1034 constitute a negative-feedback circuit, bear anti-
The voltage of the reverse input end of the first operational amplifier 1022 is equal to the voltage of the positive input of operational amplifier in current feed circuit,
The voltage of the reverse input end of the second operational amplifier 1032 is equal to the positive input of operational amplifier in negative-feedback circuit
Voltage, first resistor 1024R1 is used for the electric current for detecting the first LED1021, and second resistance 1034R2 is used to detect second
LED1031 electric current, by the way that the second end of second resistance 1034 is connected with the negative pole of negative voltage source 105, negative voltage source 105
Plus earth, then now the first LED1021 pressure drop is V, the first LED1021 electric currents I1=V2/R1；2nd LED branch roads 103
Pressure drop is V+V4, the 2nd LED1031 electric currents I2=(V3+V4)/R2, it can be seen that, LED multi-path provided in an embodiment of the present invention drives
Dynamic circuit 10, while pressure drop less LED branch roads power consumption is not influenceed, realizes the normal work of the larger LED branch roads of pressure drop.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (10)
1. a kind of multichannel LED drive circuit, it is characterised in that including：
Constant voltage source, at least one the first LED branch road, at least one the 2nd LED branch road and each 2nd LED branch roads are corresponding
Positive voltage source；The pressure drop of the first LED branch roads is less than predetermined threshold value；The pressure drop of the 2nd LED branch roads is more than predetermined threshold value；
Wherein, the input and the negative pole of the positive voltage source of the positive pole of the constant voltage source respectively with the first LED branch roads
Connection；The negative pole ground connection of the constant voltage source；The output head grounding of the first LED branch roads；The positive pole of the positive voltage source with
The input connection of the 2nd LED branch roads, the output head grounding of the 2nd LED branch roads, the positive voltage source is used for for institute
State the 2nd LED branch roads and offset voltage is provided.
2. circuit according to claim 1, it is characterised in that
The first LED branch roads include：First LED and the first constant current drive sub-circuits；
Wherein, the input of the first LED is connected with the positive pole of the constant voltage source；The output end of first LED and institute
State the input connection of the first constant current drive sub-circuits, the output head grounding of the first constant current drive sub-circuits.
3. circuit according to claim 1, it is characterised in that
The 2nd LED branch roads include：2nd LED and the second constant current drive sub-circuits；
Wherein, the input of the 2nd LED is connected with the positive pole of the positive voltage source；The output end of 2nd LED and institute
State the input connection of the second constant current drive sub-circuits, the input end grounding of the second constant current drive sub-circuits.
4. circuit according to claim 2, it is characterised in that
The first constant current drive sub-circuits include the first operational amplifier, the first NPN triode and first resistor；
Wherein, the positive input of first operational amplifier inputs the first reference voltage, first operational amplifier
Reverse input end is connected with the input of the first resistor, the output head grounding of the first resistor；The first resistor
Emitter-base bandgap grading of the input also with first NPN triode is connected, and the base stage of first NPN triode is put with first computing
The output end connection of big device, the collector of first NPN triode is connected with the output end of the first LED.
5. circuit according to claim 3, it is characterised in that
The second constant current drive sub-circuits include the second operational amplifier, the second NPN triode and second resistance；
Wherein, the positive input of second operational amplifier inputs the second reference voltage, second operational amplifier
Reverse input end is connected with the input of the second resistance, the output head grounding of the second resistance；The second resistance
Emitter-base bandgap grading of the input also with second NPN triode is connected, and the base stage of second NPN triode is put with second computing
The output end connection of big device, the collector of second NPN triode is connected with the output end of the 2nd LED.
6. a kind of multichannel LED drive circuit, it is characterised in that including：
Constant voltage source, at least one the first LED branch road, at least one the 2nd LED branch road and each 2nd LED branch roads are corresponding
Negative voltage source；The pressure drop of the first LED branch roads is less than predetermined threshold value；The pressure drop of the 2nd LED branch roads is more than predetermined threshold value；
Wherein, the positive pole of the constant voltage source is defeated with the inputs of the first LED branch roads and the 2nd LED branch roads respectively
Enter end connection；The negative pole ground connection of the constant voltage source；The output head grounding of the first LED branch roads；The 2nd LED branch roads
Output end is connected with the negative pole of the negative voltage source, the plus earth of the negative voltage source, and it is described that the negative voltage source, which is used for,
2nd LED branch roads provide offset voltage.
7. circuit according to claim 6, it is characterised in that
The first LED branch roads include：First LED and the first constant current drive sub-circuits；
Wherein, the input of the first LED is connected with the positive pole of the constant voltage source；The output end of first LED and institute
State the input connection of the first constant current drive sub-circuits, the output head grounding of the first constant current drive sub-circuits.
8. circuit according to claim 6, it is characterised in that
The 2nd LED branch roads include：2nd LED and the second constant current drive sub-circuits；
Wherein, the input of the 2nd LED is connected with the positive pole of the constant voltage source；The output end of 2nd LED and institute
State the input connection of the second constant current drive sub-circuits, output end and the negative voltage source of the second constant current drive sub-circuits
Negative pole connection.
9. circuit according to claim 7, it is characterised in that
The first constant current drive sub-circuits include the first operational amplifier, the first NPN triode and first resistor；
Wherein, the positive input of first operational amplifier inputs the first reference voltage, first operational amplifier
Reverse input end is connected with the input of the first resistor, the output head grounding of the first resistor；The first resistor
Emitter-base bandgap grading of the input also with first NPN triode is connected, and the base stage of first NPN triode is put with first computing
The output end connection of big device, the collector of first NPN triode is connected with the output end of the first LED.
10. circuit according to claim 8, it is characterised in that
The second constant current drive sub-circuits include the second operational amplifier, the second NPN triode and second resistance；
Wherein, the positive input of second operational amplifier inputs the second reference voltage, second operational amplifier
Reverse input end is connected with the input of the second resistance, the output end of the second resistance and the negative pole of the negative voltage source
Connection；Emitter-base bandgap grading of the input of the second resistance also with second NPN triode is connected, second NPN triode
Base stage is connected with the output end of second operational amplifier, and the collector of second NPN triode is defeated with the 2nd LED's
Go out end connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710316053.8A CN107071980A (en) | 2017-05-08 | 2017-05-08 | Multichannel LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710316053.8A CN107071980A (en) | 2017-05-08 | 2017-05-08 | Multichannel LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107071980A true CN107071980A (en) | 2017-08-18 |
Family
ID=59597072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710316053.8A Pending CN107071980A (en) | 2017-05-08 | 2017-05-08 | Multichannel LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107071980A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108055728A (en) * | 2017-12-27 | 2018-05-18 | 生迪智慧科技有限公司 | Multichannel Light-emitting diode LED driving circuit and driving method |
| CN108055728B (en) * | 2017-12-27 | 2024-04-09 | 生迪智慧科技有限公司 | Multi-path light-emitting diode (LED) driving circuit and driving method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7148632B2 (en) * | 2003-01-15 | 2006-12-12 | Luminator Holding, L.P. | LED lighting system |
| CN102084717A (en) * | 2008-07-04 | 2011-06-01 | 奥斯兰姆有限公司 | Circuit configuration and method for operating at least one first and one second led |
| WO2012059778A1 (en) * | 2010-11-05 | 2012-05-10 | City University Of Hong Kong | Driver for two or more parallel led light strings |
| CN103037597A (en) * | 2013-01-06 | 2013-04-10 | 深圳创维－Rgb电子有限公司 | Multi-channel LED (Light Emitting Diode) constant current control circuit and LED light source control system |
| CN105704858A (en) * | 2010-11-05 | 2016-06-22 | 香港城市大学 | Driver for two or more parallel-connected LED light strings |
| CN206851083U (en) * | 2017-05-08 | 2018-01-05 | 生迪智慧科技有限公司 | Multichannel LED drive circuit |
-
2017
- 2017-05-08 CN CN201710316053.8A patent/CN107071980A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7148632B2 (en) * | 2003-01-15 | 2006-12-12 | Luminator Holding, L.P. | LED lighting system |
| CN102084717A (en) * | 2008-07-04 | 2011-06-01 | 奥斯兰姆有限公司 | Circuit configuration and method for operating at least one first and one second led |
| WO2012059778A1 (en) * | 2010-11-05 | 2012-05-10 | City University Of Hong Kong | Driver for two or more parallel led light strings |
| CN105704858A (en) * | 2010-11-05 | 2016-06-22 | 香港城市大学 | Driver for two or more parallel-connected LED light strings |
| CN103037597A (en) * | 2013-01-06 | 2013-04-10 | 深圳创维－Rgb电子有限公司 | Multi-channel LED (Light Emitting Diode) constant current control circuit and LED light source control system |
| CN206851083U (en) * | 2017-05-08 | 2018-01-05 | 生迪智慧科技有限公司 | Multichannel LED drive circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108055728A (en) * | 2017-12-27 | 2018-05-18 | 生迪智慧科技有限公司 | Multichannel Light-emitting diode LED driving circuit and driving method |
| CN108055728B (en) * | 2017-12-27 | 2024-04-09 | 生迪智慧科技有限公司 | Multi-path light-emitting diode (LED) driving circuit and driving method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9155149B2 (en) | Self-adaptive drive circuit and LED lamp with the same | |
| CN106576408B (en) | Synchronous mode multichannel light emitting diode drive device | |
| CN101916548B (en) | Control circuit of light-emitting diode (LED) lamp tube of liquid crystal display | |
| CN107155238B (en) | A kind of multiple-channel output constant current driver circuit for LED and driving method | |
| CN103444264A (en) | Current balancing circuit and method | |
| CN102856892B (en) | A kind of power supply | |
| CN108055718B (en) | LED parallel current-sharing control method, system and circuit | |
| CN103384436B (en) | LED-backlit constant-current circuit | |
| CN103687154B (en) | Phase-cut dimming controls circuit and illumination control apparatus | |
| CN102652461A (en) | Driving modes for light circuits | |
| CN103401209A (en) | LED (light emitting diode) backlight short-circuit protection circuit | |
| CN105634263A (en) | Protection circuit self-adaptive to input voltage | |
| CN102711310A (en) | Light-emitting diode (LED) drive circuit and lamp | |
| CN102448221B (en) | Light emitting diode driving circuit, voltage selection circuit, and method for driving thereof | |
| CN206851083U (en) | Multichannel LED drive circuit | |
| CN105578674A (en) | Apparatus for driving light emitting diode having a current switch | |
| CN207518896U (en) | LED light emission drive circuits | |
| CN107071980A (en) | Multichannel LED drive circuit | |
| CN103167678B (en) | A kind of multiple constant current LED drive circuit and LED drive chip | |
| CN202353659U (en) | Circuit for inputting video signal | |
| CN201541370U (en) | LED lamp driving circuit | |
| CN207802450U (en) | The light source driving circuit and light source module of tunable optical | |
| CN208386965U (en) | A kind of changeable doubleway output adjustable constant flow source circuit of LED | |
| CN103118470A (en) | LED parallel circuit with equalized branch current | |
| CN101730329A (en) | Back light module control system and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170818 |