CN206851083U - Multichannel LED drive circuit - Google Patents
Multichannel LED drive circuit Download PDFInfo
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- CN206851083U CN206851083U CN201720499299.9U CN201720499299U CN206851083U CN 206851083 U CN206851083 U CN 206851083U CN 201720499299 U CN201720499299 U CN 201720499299U CN 206851083 U CN206851083 U CN 206851083U
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Abstract
The utility model provides a kind of multichannel LED drive circuit, and the multipath LED drive circuit includes：Constant voltage source, at least one first LED branch roads, at least one 2nd LED branch roads and positive voltage source corresponding to 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.Multichannel LED drive circuit provided by the utility model, while pressure drop less LED branch roads power consumption is not influenceed, realize the normal work of the larger LED branch roads of pressure drop.
Description
Technical field
It the utility model is related 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 that 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, in the prior art, by increasing the voltage of constant pressure source as the larger branch of pressure drop
Road provides offset voltage, using this sample loading mode, although can cause the larger LED branch road normal works of pressure drop, can lead simultaneously
Cause the less branch road power consumption increase of pressure drop.
Utility model content
The utility model provides a kind of multichannel LED drive circuit, is not influenceing the less LED branch roads of pressure drop
While power consumption, the normal work of the larger LED branch roads of pressure drop is realized.
The utility model embodiment provides a kind of multichannel LED drive circuit, including：
Constant voltage source, at least one first LED branch roads, at least one 2nd LED branch roads 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 connects；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 the embodiment of the utility model one, the first LED branch roads include：First LED and the first constant current driving son electricity
Road；
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 the embodiment of the utility model one, the 2nd LED branch roads include：2nd LED and the second constant current driving son electricity
Road；
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 the embodiment of the utility model one, the first constant current drive sub-circuits include the first operational amplifier, first
NPN triode 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 the embodiment of the utility model one, the second constant current drive sub-circuits include the second operational amplifier, second
NPN triode 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 utility model embodiment also provides a kind of multichannel LED drive circuit, including：
Constant voltage source, at least one first LED branch roads, at least one 2nd LED branch roads 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 positive pole of the constant voltage source input with the first LED branch roads and the 2nd LED branch roads respectively
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 the embodiment of the utility model one, the first LED branch roads include：First LED and the first constant current driving son electricity
Road；
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 the embodiment of the utility model one, the 2nd LED branch roads include：2nd LED and the second constant current driving son electricity
Road；
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 the embodiment of the utility model one, the first constant current drive sub-circuits include the first operational amplifier, first
NPN triode 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 the embodiment of the utility model one, the second constant current drive sub-circuits include the second operational amplifier, second
NPN triode 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 connects；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.
The multichannel LED drive circuit that the utility model embodiment provides, including：At least one first LED
Branch road, at least one 2nd LED branch roads and positive voltage source corresponding to each 2nd LED branch roads；Wherein, the positive pole difference of constant voltage source
It is connected with the input of the first LED branch roads and the negative pole of positive voltage source；The negative pole ground connection of constant voltage source；First LED branch roads it is defeated
Go out end 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 electricity
Potential source is used to provide offset voltage for the 2nd LED branch roads.As can be seen here, the LED multi-path driving that the utility model embodiment provides
Circuit, by being connected by 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 with
The positive pole connection of positive voltage source so that offset voltage can be provided for the 2nd larger LED branch roads of pressure drop by the positive voltage source,
So as to while pressure drop less LED branch roads power consumption is not influenceed, realize the normal work of the larger LED branch roads of pressure drop.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used does one and simply introduced in description of the prior art, it should be apparent that, drawings in the following description are
Some embodiments of the utility model, for those of ordinary skill in the art, do not paying the premise of creative labor
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation for multichannel LED drive circuit that the utility model embodiment provides；
Fig. 2 is the structural representation for another multichannel LED drive circuit that the utility model embodiment provides
Figure；
Fig. 3 is a kind of structural representation for multichannel LED drive circuit that the utility model embodiment provides；
Fig. 4 is the structural representation for another multichannel LED drive circuit that the utility model embodiment provides
Figure.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, is belonged to
The scope of the utility model protection.
Term " first ", " second ", " the 3rd " in specification and claims of the present utility model and above-mentioned accompanying drawing,
(if present)s such as " the 4 " is for distinguishing similar object, without for describing specific order or precedence.Should
The data that the understanding so uses can exchange in the appropriate case, so as to embodiment of the present utility model described herein, example
If implemented with the order in addition to those for illustrating or describing herein.In addition, term " comprising " and " having " and
Their any deformation, it is intended that cover it is non-exclusive include, for example, containing the process of series of steps or unit, side
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 repeat no more in certain embodiments.
Fig. 1 is a kind of structural representation for multichannel LED drive circuit 10 that the utility model embodiment provides
Figure, certainly, the utility model embodiment simply illustrate by taking Fig. 1 as an example, but do not represent the utility model and be limited only to this.
Shown in Figure 1, the multipath LED drive circuit 10 can include：
Constant voltage source 101, at least one first LED branch roads 102, at least one 2nd LED branch roads 103 and each 2nd LED
Positive voltage source 104 corresponding to 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 input of the first LED branch roads 102 and the negative pole of positive voltage source 104
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, it is the 2nd LED branch that positive voltage source 104, which is used for,
Road 103 provides offset voltage.
In the utility model embodiment, the number of the first LED branch roads 102 and the 2nd LED branch roads 103 can be 1, also may be used
Think 2, it is of course also possible to for 3, can be specifically configured according to being actually needed, here, the utility model embodiment simply with
The number of first LED branch roads 102 and the 2nd LED branch roads 103 is to illustrate exemplified by 1, but does not represent the utility model only
It is confined to this.Wherein, 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 being actually needed.Generally when LED dispatches from the factory, its corresponding specifications
The middle pressure drop scope that can be recorded the LED normal works and be 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 the utility model embodiment, the pressure drop of the first LED branch roads 102 is less than predetermined threshold value；2nd LED
The pressure drop of branch road 103 is more than predetermined threshold value, then the pressure drop of the first LED branch roads 102 is larger, the pressure drops of the 2nd LED branch roads 103 compared with
It is small.
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 as to 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.
The multipath LED drive circuit 10 that the utility model embodiment provides, including：Constant voltage source 101, at least one first
LED branch roads 102, at least one 2nd LED branch roads 103 and positive voltage source 104 corresponding to each 2nd LED branch roads 103；Wherein, it is permanent
The positive pole of voltage 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 ground connection；The output head grounding of first LED branch roads 102；The positive pole of positive voltage source 104 and the 2nd LED branch roads 103
Input connects, the output head grounding of the 2nd LED branch roads 103, and positive voltage source 104 is used to provide compensation for the 2nd LED branch roads 103
Voltage.As can be seen here, the multipath LED drive circuit 10 that the utility model embodiment provides, by by the first LED branch roads 102
Input be connected with the negative pole of positive voltage source 104, the positive pole of the input of the 2nd LED branch roads 103 and positive voltage source 104 is connected
Connect so that can be that the 2nd larger LED branch roads 103 of pressure drop provide offset voltage by the positive voltage source 104, so as in not shadow
While ringing the first LED 102 power consumptions of branch road, the normal work of the 2nd LED branch roads 103 is realized.
Based on embodiment corresponding to Fig. 1, further, shown in Figure 2, Fig. 2 provides for the utility model embodiment
Another multichannel LED drive circuit 10 structural representation, the multipath LED drive circuit 10 can also wrap
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 connect 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 replaces, and the utility model embodiment simply illustrates by taking the first operational amplifier 1022 as an example, but does not represent this reality
This is limited only to new.
In addition, the first NPN triode 1023 can also be replaced with the first metal-oxide-semiconductor, the utility model embodiment is simply with the
Illustrated exemplified by one NPN triode 1023, but do not represent the utility model and be limited only to this.Example, when the first constant current
When drive sub-circuits include the first operational amplifier 1022, the first metal-oxide-semiconductor and first resistor 1024, the first operational amplifier 1022
Positive input input the first reference voltage, the reverse input end of the first operational amplifier 1022 is defeated with first resistor 1024
Enter end connection, the output head grounding of first resistor 1024；The input of first resistor 1024 also connects with the source electrode of the first metal-oxide-semiconductor
Connect, the grid of the first metal-oxide-semiconductor is connected with the output end of the first operational amplifier 1022, the drain electrode of the first metal-oxide-semiconductor and 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 connect 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 utility model embodiment simply illustrates by taking the second operational amplifier 1032 as an example, but does not represent the utility model
It is limited only to this.
In addition, the second NPN triode 1033 can also be replaced with the second metal-oxide-semiconductor, the utility model embodiment is simply with the
Illustrated exemplified by two NPN triodes 1033, but do not represent the utility model and be limited only to this.Example, when the second constant current
When drive sub-circuits include the second operational amplifier 1032, the second metal-oxide-semiconductor and second resistance 1034, second operational amplifier
1032 positive input inputs the second reference voltage, reverse input end and the second resistance 1034 of the second operational amplifier 1032
Input connection, the output head grounding of second resistance 1034；The input of second resistance 1034 also connects with the source of the second metal-oxide-semiconductor
Connect, the grid of the second metal-oxide-semiconductor is connected with the output end of the second operational amplifier 1032, the drain electrode of the second metal-oxide-semiconductor and second
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 provides
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 form a negative-feedback circuit, the
Two operational amplifiers 1032, the second NPN triode 1033 and second resistance 1034 form 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, the utility model embodiment provides
Multipath LED drive circuit 10, while pressure drop less LED branch roads power consumption is not influenceed, realize the larger LED branch roads of pressure drop
Normal work.
Fig. 3 is a kind of structural representation for multichannel LED drive circuit 10 that the utility model embodiment provides
Figure, certainly, the utility model embodiment simply illustrate by taking Fig. 3 as an example, but do not represent the utility model and be limited only to this.
Shown in Figure 3, the multipath LED drive circuit 10 can include：
Constant voltage source 101, at least one first LED branch roads 102, at least one 2nd LED branch roads 103 and each 2nd LED
Negative voltage source 105 corresponding to 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 connects；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 it is the 2nd LED that negative voltage source 105, which is used for,
Branch road 103 provides offset voltage.
In the utility model embodiment, the number of the first LED branch roads 102 and the 2nd LED branch roads 103 can be 1, also may be used
Think 2, it is of course also possible to for 3, can be specifically configured according to being actually needed, here, the utility model embodiment simply with
The number of first LED branch roads 102 and the 2nd LED branch roads 103 is to illustrate exemplified by 1, but does not represent the utility model only
It is confined to this.Wherein, 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 being actually needed.Generally when LED dispatches from the factory, its corresponding specifications
The middle pressure drop scope that can be recorded the LED normal works and be 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 the utility model embodiment, the pressure drop of the first LED branch roads 102 is less than predetermined threshold value；2nd LED
The pressure drop of branch road 103 is more than predetermined threshold value, then the pressure drop of the first LED branch roads 102 is larger, the pressure drops of the 2nd LED branch roads 103 compared with
It is small.
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 that smaller not influenceing pressure drop
The first LED 102 power consumptions of branch road while, realize the normal works of the 2nd larger LED branch roads 103 of pressure drop.
The multipath LED drive circuit 10 that the utility model embodiment provides, including：Constant voltage source 101, at least one first
LED branch roads 102, at least one 2nd LED branch roads 103 and negative voltage source 105 corresponding to each 2nd LED branch roads 103；Wherein, it is permanent
The positive pole of voltage 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 pressure
The negative pole ground connection of power supply 101；The output head grounding of first LED branch roads 102；The output end and negative voltage source of 2nd LED branch roads 103
105 negative pole connection, the plus earth of negative voltage source 105, negative voltage source 105 are used to provide compensation electricity for the 2nd LED branch roads 103
Pressure.As can be seen here, the multipath LED drive circuit 10 that the utility model embodiment provides, by by the defeated of the 2nd LED branch roads 103
Go out end to be connected with the negative pole of negative voltage source 105 so that can be the 2nd larger LED branch roads of pressure drop by the negative voltage source 105
103 provide offset voltage, so as to while the first LED 102 power consumptions of branch road are not influenceed, realize the normal of the 2nd LED branch roads 103
Work.
Based on embodiment corresponding to Fig. 3, further, shown in Figure 4, Fig. 4 provides for the utility model embodiment
Another multichannel LED drive circuit 10 structural representation, the multipath LED drive circuit 10 can also wrap
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 replaces, and the utility model embodiment simply illustrates by taking the first operational amplifier 1022 as an example, but does not represent this reality
This is limited only to new.
In addition, the first NPN triode 1023 can also be replaced with the first metal-oxide-semiconductor, the utility model embodiment is simply with the
Illustrated exemplified by one NPN triode 1023, but do not represent the utility model and be limited only to this.Example, when the first constant current
When drive sub-circuits include the first operational amplifier 1022, the first metal-oxide-semiconductor and first resistor 1024, first operational amplifier
1022 positive input inputs the first reference voltage, reverse input end and the first resistor 1024 of the first operational amplifier 1022
Input connection, the output head grounding of first resistor 1024；Source electrode of the input of first resistor 1024 also with the first metal-oxide-semiconductor
Connection, the grid of the first metal-oxide-semiconductor are connected with the output end of the first operational amplifier 1022, the drain electrode of the first metal-oxide-semiconductor and 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 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 are 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 utility model embodiment simply illustrates by taking the second operational amplifier 1032 as an example, but does not represent the utility model
It is limited only to this.
In addition, the second NPN triode 1033 can also be replaced with the second metal-oxide-semiconductor, the utility model embodiment is simply with the
Illustrated exemplified by two NPN triodes 1033, but do not represent the utility model and be limited only to this.Example, when the second constant current
When drive sub-circuits include the second operational amplifier 1032, the second metal-oxide-semiconductor and second resistance 1034, second operational amplifier
1032 positive input inputs the second reference voltage, reverse input end and the second resistance 1034 of the second operational amplifier 1032
Input connection, the output end of second resistance 1034 is connected with the negative pole of negative voltage source 105；The input of second resistance 1034
Source electrode also with the second metal-oxide-semiconductor is connected, and the grid of the second metal-oxide-semiconductor is connected with the output end of the second operational amplifier 1032, and second
The drain electrode of metal-oxide-semiconductor 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 provided
Voltage is V4, and the first reference voltage of the first operational amplifier 1022 is V2, and the second benchmark of the second operational amplifier 1032 is electric
V3 is pressed, wherein, the first operational amplifier 1022, the first NPN triode 1023 and first resistor 1024 form a negative-feedback electricity
Road, the second operational amplifier 1032, the second NPN triode 1033 and second resistance 1034 form 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 are 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, the multichannel that the utility model embodiment provides
LED drive circuit 10, while pressure drop less LED branch roads power consumption is not influenceed, realize the normal of the larger LED branch roads of pressure drop
Work.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
- A kind of 1. multichannel LED drive circuit, it is characterised in that including：Corresponding to constant voltage source, at least one first LED branch roads, at least one 2nd LED branch roads and each 2nd LED branch roads 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 positive pole of the constant voltage source respectively with the input of the first LED branch roads and the negative pole of the positive voltage source 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 are 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 thatThe 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 thatThe 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 thatThe 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 are connected with the output end of the first LED.
- 5. circuit according to claim 3, it is characterised in thatThe 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 are connected with the output end of the 2nd LED.
- A kind of 6. multichannel LED drive circuit, it is characterised in that including：Corresponding to constant voltage source, at least one first LED branch roads, at least one 2nd LED branch roads and each 2nd LED branch roads 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 thatThe 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 thatThe 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 thatThe 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 are connected with the output end of the first LED.
- 10. circuit according to claim 8, it is characterised in thatThe 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.
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| CN201720499299.9U CN206851083U (en) | 2017-05-08 | 2017-05-08 | Multichannel LED drive circuit |
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| CN201720499299.9U CN206851083U (en) | 2017-05-08 | 2017-05-08 | Multichannel LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071980A (en) * | 2017-05-08 | 2017-08-18 | 生迪智慧科技有限公司 | Multichannel LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071980A (en) * | 2017-05-08 | 2017-08-18 | 生迪智慧科技有限公司 | Multichannel LED drive circuit |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Multi-channel LED driver circuit Effective date of registration: 20230227 Granted publication date: 20180105 Pledgee: Tongxiang Yunbei Investment Construction Co.,Ltd. Pledgor: SENGLED Co.,Ltd. Registration number: Y2023980033490 |
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