CN102595680B - Multi-output LED (Light-Emitting Diode) constant-current driving circuit - Google Patents

Multi-output LED (Light-Emitting Diode) constant-current driving circuit Download PDF

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CN102595680B
CN102595680B CN201110002850.1A CN201110002850A CN102595680B CN 102595680 B CN102595680 B CN 102595680B CN 201110002850 A CN201110002850 A CN 201110002850A CN 102595680 B CN102595680 B CN 102595680B
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current
resistance
operational amplifier
output
signal
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CN102595680A (en
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葛良安
姚晓莉
华桂潮
柳杨
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Inventronics Hangzhou Co Ltd
Led One Hangzhou Co Ltd
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Led One Hangzhou Co Ltd
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Priority to PCT/CN2011/079187 priority patent/WO2012092781A1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

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Abstract

The invention provides a multi-output LED (Light-Emitting Diode) constant-current driving circuit. The circuit comprises a constant-current source and at least two paths of load branch circuits. At least one path of load branch circuit is used as a reference branch circuit and all of or part of the rest of paths of load branch circuits are regulating branch circuits; one current sampling module is respectively arranged for each path of reference branch circuit; one current regulating module and one current regulation control module are respectively arranged for each path of regulating branch circuit; and each current regulation control module is used for receiving a current sampling signal, which is used as a first signal, of the current sampling module of each reference circuit connected with the current regulation control module, receiving a current sampling signal, which is used as a second signal, of the current regulating module of each regulating branch circuit, controlling the impedance of the current regulating module of each regulating branch circuit connected with the current regulation control module and regulating the current of each regulating branch circuit connected with the current regulation control module. The circuit provided by the embodiment of the invention has simple structure and low cost.

Description

A kind of LED constant current driving circuit of many outputs
Technical field
The present invention relates to circuit of LED, particularly relate to a kind of LED constant current driving circuit of many outputs.
Background technology
Light-emitting diode (LED, Light Emitting Diode) the constant-current drive circuit Zhong，Mei road load of multichannel output is comprised of one or more LED lamps.
In prior art, conventionally adopt the form of constant voltage module+multichannel DC/DC constant-current circuit to form the LED constant-current control drive circuit that multichannel is exported, as shown in Figure 1.
Described in Fig. 1, drive circuit comprises: a constant voltage module and several non-isolation DC/DC constant-current circuits.Each non-isolation DC/DC constant-current circuit all connects the output of described constant voltage module, is respectively used to drive a paths of LEDs load.This DC/DC constant-current circuit can be the high frequency conversion circuit of BUCK mono-class, can be also linear regulation circuit.
The output of described constant voltage module is as the input of multiple constant current circuit.Every road constant-current circuit is done separately constant current and is controlled, and the size of current on every road can be independently set as required, thereby regulate the brightness of each paths of LEDs load, realizes the adjusting of color or the colour temperature of LED light source.
But there is following shortcoming in the LED constant-current control drive circuit of multichannel output described in prior art: need to a DC/DC constant-current circuit be all set for every paths of LEDs load, make that circuit is complicated, cost is higher.
Summary of the invention
The LED constant current driving circuit that the object of this invention is to provide a kind of many outputs, it is simple in structure and cost is lower.
For achieving the above object, the invention provides following scheme: a kind of LED constant current driving circuit of many outputs, described circuit comprises: a constant-current source; Described constant-current source is with two-way load branch at least;
Using at least one road load branch as with reference to branch road, all the other all or part of load branch are for regulating branch road;
Wei Mei road reference arm arranges respectively a current sample module; The LED load series connection of described current sample module and reference arm is at the output of described constant-current source;
Wei Mei road regulates branch road that one current regulating module and current regulation control module are set respectively; Described current regulating module and the output that regulates the LED load series connection of branch road at described constant-current source;
The first signal input of described current regulation control module directly connects or connects at least one road reference arm by resistance, secondary signal input termination one tunnel of described current regulation control module regulates branch road, the current regulating module of the adjusting branch road that the output termination of described current regulation control module is attached thereto;
Described current regulation control module, for the current sampling signal of current sample module that receives each reference arm being attached thereto as first signal, with receive to regulate the current sampling signal of current regulating module of branch road as secondary signal, the impedance of the current regulating module of the adjusting branch road that control is attached thereto, the electric current of the adjusting branch road that adjusting is attached thereto.
Preferably, described first signal and described secondary signal have common reference end, the negative output terminal that described common reference end is constant-current source;
Described current regulating module comprises: the first operational amplifier, compensating network;
First signal is input to the in-phase input end of described the first operational amplifier, and secondary signal is input to the inverting input of described the first operational amplifier, and the output of described the first operational amplifier is as the output of described current regulation control module;
Described compensating network is connected between the inverting input and output of described operational amplifier.
Preferably, described first signal and described secondary signal have common reference end, the negative output terminal that described common reference end is constant-current source;
Described current regulation control module comprises: the first operational amplifier, compensating network, the 5th adjustable resistance;
One end of described the 5th adjustable resistance is as the first signal input of described current regulation control module, another termination common reference end of described the 5th adjustable resistance;
The in-phase input end of described the first operational amplifier connects the sliding end of described the 5th adjustable resistance, secondary signal is input to the inverting input of described the first operational amplifier, and the output of described the first operational amplifier is as the output of described current regulation control module;
Described compensating network is connected between the inverting input and output of described the first operational amplifier.
Preferably, described first signal and described secondary signal have common reference end, the negative output terminal that described common reference end is constant-current source;
Described current regulation control module comprises: the first operational amplifier, compensating network, the 6th resistance, filter unit, the first metal-oxide-semiconductor;
One end of described the 6th resistance is as the first signal input of described current regulation control module, the drain electrode of the first metal-oxide-semiconductor described in another termination of described the 6th resistance; The source electrode of described the first metal-oxide-semiconductor connects common reference end, and the gate pole of described the first metal-oxide-semiconductor connects control signal;
The input of described filter unit connects the drain-source utmost point of described the first metal-oxide-semiconductor, the in-phase input end of first output termination the first operational amplifier of described filter unit, the second output termination common reference end of described filter unit;
Secondary signal is input to the inverting input of described the first operational amplifier, and the output of described the first operational amplifier is as the output of described current regulation control module;
Described compensating network is connected between the inverting input and output of described the first operational amplifier.
Preferably, described current sample module is a resistance.
Preferably, described current regulating module is that a resistance and one is adjusted pipe; Described resistance and described adjustment pipe string connection; Described resistance is for the electric current of this adjusting branch road of sampling.
Preferably, on the output bus of described constant-current source, be in series with switching tube.
Preferably, when the first input end of described current regulation control module is connected to few two-way reference arm Shi，Wei Mei road reference arm, one current-sharing unit is set; The LED load series connection of described current-sharing unit and described current sample module, reference arm is between described constant-current source and ground;
The first input end of described current regulation control module is connected with each reference arm by a resistance respectively.
The present invention also provides a kind of LED constant current driving circuit of many outputs, and described circuit comprises: a constant-current source; Described constant-current source is with two-way load branch at least; Wherein at least one load branch is for regulating branch road;
For each regulates branch road, one current regulating module and current regulation control module are set respectively; Described current regulating module is connected with regulating the LED load of branch road, and an end of described series arm is connected on an output of described constant-current source, and the other end connects another output of constant-current source by total current sample circuit;
Described total current sample circuit output total current sampled signal;
Total current sample circuit described in the first signal input termination of described current regulation control module, secondary signal input termination one tunnel of described current regulation control module regulates branch road, the current regulating module of the adjusting branch road that the output termination of described current regulation control module is attached thereto;
Described current regulating module, for receiving the current sampling signal of total load current sampled signal with the current regulating module of the adjusting branch road being attached thereto of described constant-current source output, the impedance of the current regulating module of the adjusting branch road that control is attached thereto, the electric current of the adjusting branch road that adjusting is attached thereto.
Preferably, described total current sample circuit comprises the 12 resistance, and described the 12 ohmically voltage is total current sampled signal;
Described current regulation control module comprises:
The inverting input of four-operational amplifier connects one end of described the 12 resistance through the 15 resistance, the normal phase input end of described four-operational amplifier connects the other end of described the 12 resistance through the 14 resistance, the normal phase input end of output termination the 3rd operational amplifier of described four-operational amplifier;
The 16 resistance series connection is between the inverting input and output of described four-operational amplifier; The 13 resistance series connection is between the normal phase input end of described four-operational amplifier and the reference ground of described four-operational amplifier;
Described in the anti-phase input termination of described the 3rd operational amplifier, regulate branch road, regulate the control end of the current regulating module of branch road described in the output termination of described the 3rd operational amplifier;
Compensating network is connected between the inverting input and output of described the 3rd operational amplifier.
Preferably, described total current sample circuit comprises the 12 resistance, and described the 12 ohmically voltage is total current sampled signal;
Described current regulation control module comprises:
Two stiff ends of the 17 adjustable resistance are connected on respectively the 12 resistance two ends;
The inverting input of four-operational amplifier connects the adjustable end of described the 17 adjustable resistance through the 15 resistance, the normal phase input end of described four-operational amplifier connects a stiff end of the 17 resistance through the 14 resistance, the normal phase input end of output termination the 3rd operational amplifier of described four-operational amplifier;
The 16 resistance series connection is between the inverting input and output of described four-operational amplifier; The 13 resistance series connection is between the normal phase input end of described four-operational amplifier and the reference ground of described four-operational amplifier;
Described in the anti-phase input termination of described the 3rd operational amplifier, regulate branch road, regulate the control end of the current regulating module of branch road described in the output termination of described the 3rd operational amplifier;
Compensating network is connected between the inverting input and output of described the 3rd operational amplifier.
Preferably, described total current sample circuit comprises the 12 resistance, and described the 12 ohmically voltage is total current sampled signal;
Described current regulation control module comprises:
The hot end of the 12 resistance described in one termination of the 18 resistance, the drain electrode of another termination the second metal-oxide-semiconductor of described the 18 resistance, the source electrode of described the second metal-oxide-semiconductor connects the cold end of described the 12 resistance, and the gate pole of described the second metal-oxide-semiconductor connects control signal;
Two inputs of filter unit connect respectively the drain-source utmost point of described the second metal-oxide-semiconductor, an output of described filter unit connects the reversed-phase output of four-operational amplifier through the 15 resistance, another output of described filter unit connects the normal phase input end of four-operational amplifier through the 14 resistance;
The normal phase input end of output termination the 3rd operational amplifier of described four-operational amplifier;
The 16 resistance series connection is between the inverting input and output of described four-operational amplifier; The 13 resistance series connection is between the normal phase input end of described four-operational amplifier and the reference ground of described four-operational amplifier;
Adjustable branch road described in the anti-phase input termination of described the 3rd operational amplifier, the control end of the current regulating module of adjustable branch road described in the output termination of described the 3rd operational amplifier;
Described compensating network is connected between the inverting input and output of described the 3rd operational amplifier.
Preferably, described current regulating module is that a resistance and one is adjusted pipe; Described resistance and described adjustment pipe string connection; Described resistance is for the electric current of this adjusting branch road of sampling.
Preferably, on the output bus of described constant-current source, be in series with switching tube.
According to specific embodiment provided by the invention, the invention discloses following technique effect:
The LED constant current driving circuit of many outputs described in the embodiment of the present invention, using the sampled signal of the current sampling signal of at least one paths of LEDs load branch or total load current as with reference to signal, input signal using the current sampling signal of described reference signal and the load branch being conditioned as current regulation control module, utilize the output signal of described current regulation control module to control the size of the impedance of the load branch being conditioned, thereby regulate the size of current of this road load branch.Need to compare for every paths of LEDs load all arranges a DC/DC constant-current circuit with prior art, circuit only need to arrange for the load branch being conditioned current regulation control module described in the embodiment of the present invention, makes that circuit structure is simple and cost is lower.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the LED constant-current control drive circuit figure of the multichannel output of prior art;
Fig. 2 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention one;
Fig. 3 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention two;
Fig. 4 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention three;
Fig. 5 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention four;
Fig. 6 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention five;
Fig. 7 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention six;
Fig. 8 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention seven;
Fig. 9 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention eight;
Figure 10 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention nine;
Figure 11 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention ten;
Figure 12 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 11;
Figure 13 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 12;
Figure 14 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 13;
Figure 15 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 14;
Figure 16 is the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 15.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The LED constant current driving circuit that the object of this invention is to provide a kind of many outputs, it is simple in structure and cost is lower.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
In the LED constant current driving circuits of exporting described in the embodiment of the present invention more, using the sampled signal of the current sampling signal of at least one paths of LEDs load branch or total load current as with reference to signal, input signal using the current sampling signal of described reference signal and the load branch being conditioned as current regulation control module, utilize the output signal of described current regulation control module to control the size of the impedance of the load branch being conditioned, thereby regulate the size of current of this road load branch.
With reference to Fig. 2, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention one.Described in embodiment mono-, in circuit, the current sampling signal of ，Yi mono-road load branch, as with reference to signal, regulates the electric current of other all or part of load branch.
Load branch is as a reference referred to as to reference arm, and the load branch that referenced branch road regulates is for regulating branch road.
As shown in Figure 2, the input power supply of this drive circuit is constant-current source 10, comprises two paths of LED load branch.Circuit shown in Fig. 2 is usingd the first load branch as with reference to branch road, and the electric current that regulates the second load branch is that example describes.Described the second load branch is adjusting branch road.
As the first load branch with reference to branch road, comprise: LED load A1 and current sample module 11; Described LED load A1 and 11 series connections of current sample module are at the output of described constant-current source 10.
As regulating the second load branch of branch road to comprise: LED load A2 and current regulating module 12; Described LED load A2 and current regulating module 12 series connections are at the output of described constant-current source 10.
Described LED load A1 and A2 all can comprise the LED light source of one or more series connection.
For described the second load branch arranges a current regulation control module 13, described current regulation control module 13 is connected between described the first load branch and the second load branch; Concrete, the first load branch described in the first signal input termination of described current regulation control module 13, the second load branch described in the secondary signal input termination of described current regulation control module 13, the current regulating module 12 of the second load branch described in the output termination of described current regulation control module 13.
Described current regulation control module 13, for the current sampling signal of current sample module 11 that receives the first load branch as first signal and the current sampling signal of current regulating module 12 that receives the second load branch as secondary signal, control the impedance of the current regulating module 12 of the second load branch, regulate the electric current of the second load branch.
It should be noted that, described first signal and described secondary signal have common reference end, and described common reference end is the negative output terminal of constant-current source 10.
Concrete, described current sample module 11 can be specially a resistance, as shown in the first resistance R 1 in Fig. 2; Described the first resistance R 1 is connected between constant-current source 10 and ground after connecting with LED load 1.
Described current regulating module 12 can be specially an adjustment pipe and a resistance, and described adjustment pipe is connected with described resistance, as adjusted in Fig. 2 as shown in pipe S1 and the second resistance R 2; Described adjustment pipe S1 and the second resistance R 2 are connected on the output of constant-current source 10 after connecting successively with LED load 2; The control end of described adjustment pipe S1 is the control end of described current regulating module 12, connects the output of described current regulation control module 13.
Described current regulation control module 13 realizes the adjusting to size of current on the second load branch by controlling the impedance magnitude of described adjustment pipe S1.It should be noted that, the ratio k of the electric current of two-way load branch is determined by the ratio of described the first resistance R 1 and the second resistance R 2.
In the LED constant current driving circuits of exporting described in the embodiment of the present invention one more, using the current sampling signal of a paths of LEDs load branch as with reference to signal, the input signal using the current sampling signal of described reference signal and the LED load branch that is conditioned as described current regulation control module; The size of the impedance of the current regulating module of the LED load branch that the output signal of described current regulation control module is conditioned described in controlling, thus the size of current of this paths of LEDs load branch regulated.
Two paths of LED load branch described in the embodiment of the present invention in circuit can be the LED light source of two kinds of different colours.Suppose, LED load 1 is White LED light source, LED load 2 is red LED light source, and the reference signal using the current sampling signal of described White LED light source as the restrictor ring of red LED light source makes the electric current of red LED light source and the electric current of White LED light source maintain fixing ratio.Because the proportion relation of the electric current of red LED light source and White LED light source can determine the state of colour temperature and development index (CRI) CRI of whole LED circuit output.Therefore, by the embodiment of the present invention, make the electric current of red LED light source and the electric current of White LED light source maintain fixing ratio, can make the CRI of White LED light source on the low side, then mix the light source that suitable red LED light source can be realized low colour temperature, high CRI.
Light source for major part illumination application, the power of white light LEDs is much larger than the LED (as red LED light source) of other color, in light source design, the voltage of single channel or multichannel white light LEDs is designed to the highest, white light LEDs is as with reference to branch road, do not add current regulating circuit, constant-current source output voltage is directly added on white light LEDs, and the drive efficiency of white light LEDs is high, the power ratio that accounts for light source integral body due to white light LEDs is great, so the drive efficiency of light source integral body is high.
With reference to Fig. 3, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention two.Fig. 3 is a kind of embodiment of current regulation control module shown in Fig. 2.Described current regulation control module 13 comprises: the first operational amplifier IC1, the 4th resistance R 4, the first capacitor C 1.
Wherein, the in-phase input end of described the first operational amplifier IC1, as the first signal input of described current regulation control module 13, receives described first signal; The inverting input of described the first operational amplifier IC1, as the secondary signal input of described current regulation control module 13, receives described secondary signal; The output of described the first operational amplifier IC1 is as the output of described current regulation control module 13.
After described the 4th resistance R 4 and the first capacitor C 1 series connection, form compensating network, be connected between the inverting input and output of described operational amplifier IC1.
Wherein, the current sampling signal of described the first load branch (first signal is the voltage in the first resistance R 1) is input to the in-phase input end of described the first operational amplifier IC1; The current sampling signal of described the second load branch (secondary signal is the voltage in the second resistance R 2) is input to the inverting input of described the first operational amplifier IC1; Described the first operational amplifier IC1 by the current sampling signal of the current sampling signal of described the first load branch and described the second load branch relatively after, output drive signal is to the control end of described adjustment pipe S1, control the impedance magnitude of described adjustment pipe S1, and then regulate electric current on the second load branch.Circuit reaches after stable state, and making the ratio of the electric current I o2 of described the second load branch and the electric current I o1 of the first load branch is predefined ratio k; Wherein, described ratio k is determined by the ratio of described the first resistance R 1 and the second resistance R 2.
Be: Io2/Io1=R1/R2=k.
Certainly, in actual applications, described compensating network can be not limited to the way of realization shown in Fig. 3, can be any loop compensation network, and following examples are same.This part is the known technology of this area, does not repeat them here.
With reference to Fig. 4, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention three.Fig. 4 is the another kind of embodiment of current regulation control module shown in Fig. 2.
Described current regulation control module 13 comprises: the first operational amplifier IC1, the 4th resistance R 4, the first capacitor C 1, the five adjustable resistance R5.
Wherein, one end of described the 5th adjustable resistance R5 is as the first signal input of described current regulation control module 13, another termination common reference end of described the 5th adjustable resistance R5;
The in-phase input end of described the first operational amplifier IC1 connects the sliding end of described the 5th adjustable resistance R5; The inverting input of described the first operational amplifier IC1, as the secondary signal input of described current regulation control module 13, receives described secondary signal; The output of described the first operational amplifier IC1 is as the output of described current regulation control module 13.
After described the 4th resistance R 4 and the first capacitor C 1 series connection, form compensating network, be connected between the inverting input and output of described the first operational amplifier IC1.
Described in the embodiment of the present invention three, circuit is identical with embodiment bis-to the Principles of Regulation of the electric current of the second load branch.The ratio that is the electric current I o2 of described the second load branch and the electric current I o1 of the first load branch is no longer fixing predefined ratio k (ratio of the first resistance R 1 and the second resistance R 2), but a variable value.Be, can according to actual needs, by regulating the sliding end of described the 5th adjustable resistance R5, regulate the ratio of the electric current I o2 of described the second load branch and the electric current I o1 of the first load branch.
It should be noted that, described the 5th adjustable resistance R5 can pass through manual adjustments.
With reference to Fig. 5, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention four.Fig. 5 is the third embodiment of current regulation control module shown in Fig. 2.
Described current regulation control module 13 comprises: the first operational amplifier IC1, the 4th resistance R 4, the first capacitor C 1, the six resistance R 6, filter unit 130, the first metal-oxide-semiconductor S2.
Wherein, one end of described the 6th resistance R 6 is as the first signal input of described current regulation control module 13, the drain electrode of the first metal-oxide-semiconductor S2 described in another termination of described the 6th resistance R 6;
The source electrode of described the first metal-oxide-semiconductor S2 connects common reference end, and the gate pole of described the first metal-oxide-semiconductor S2 meets control signal V1;
The input of described filter unit 130 connects respectively drain electrode and the source electrode of described the first metal-oxide-semiconductor S2, the in-phase input end of an output termination first operational amplifier IC1 of described filter unit 130, another output termination common reference end of described filter unit 130;
The inverting input of described the first operational amplifier IC1, as the secondary signal input of described current regulation control module 13, receives described secondary signal; The output of described the first operational amplifier IC1 is as the output of described current regulation control module 13.
After described the 4th resistance R 4 and the first capacitor C 1 series connection, form compensating network, be connected between the inverting input and output of described the first operational amplifier IC1.
Described in the embodiment of the present invention four, circuit is identical with embodiment bis-to the Principles of Regulation of the electric current of the second load branch.The ratio that is the electric current I o2 of described the second load branch and the electric current I o1 of the first load branch is no longer fixing predefined ratio k (ratio of the first resistance R 1 and the second resistance R 2), but a variable value.Described in Fig. 5, the first metal-oxide-semiconductor S2 is operated on off state, by regulating the conducting duty ratio of described the first metal-oxide-semiconductor S2, the mean value of the electric current I o1 that can change described the first load branch after described filter unit 130, thus it is adjustable to realize the ratio of the electric current I o2 of described the second load branch and the electric current I o1 of the first load branch.
It should be noted that, the gate pole control signal V1 of described the first metal-oxide-semiconductor S2 can be the control signal of analog circuit or digital circuit output.Wherein, digital circuit if, described digital circuit can be accepted user interface control.
Three kinds of embodiments of described current regulation control module have more than been provided.Certainly, the realization of described current regulation control module is not limited to above-mentioned three kinds of modes.In other embodiments of the invention, described current regulation control module can also realize by other means.
With reference to Fig. 6, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention five.Embodiment illustrated in fig. 6 five are with embodiment illustrated in fig. 2 one difference: on the output bus of described constant-current source 10, be in series with switching tube S3.
Described switching tube S3 is operated in copped wave state, and making the electric current of constant-current source 10 outputs is DC pulse current.By changing the copped wave duty ratio of described switching tube S3, can change the size of constant-current source 10 output current mean values, thereby realize the variation of the brightness of LED load in each load branch.
Circuit shown in Fig. 6 can be realized the current sampling signal of Yi Yi road load branch as with reference to signal, regulates the electric current of other road load branch.Meanwhile, the module of current regulation control shown in Fig. 6 13 can adopt foregoing any one embodiment of the embodiment of the present invention to realize.
Previous embodiment is all to take two-way load branch to describe as example.When load branch is multichannel, current sampling signal that can be by any road load branch, as the same reference signal of all adjusting branch roads, regulates the electric current of other all or part of load branch.
With reference to Fig. 7, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention six.Embodiment illustrated in fig. 7 five are with embodiment illustrated in fig. 2 one difference: described circuit comprises 3 road load branch.First load branch of usining regulates the electric current of other 2 road load branch as the same reference signal of all adjusting branch roads.
As shown in Figure 7, for as with reference to the first load branch of branch road current sample module 11 of connecting; Described current sample module 11 can be a resistance.
For as regulating the second load branch of branch road and the 3rd load branch connect respectively a current regulating module 121 and 122.Wherein, described current regulating module 121 and 122 can be an adjustment pipe and a resistance; Described resistance and described adjustment pipe string connection; Described resistance is for the electric current of this adjusting branch road of sampling.
Be respectively described the second load branch and the 3rd load branch arranges respectively a current regulation control module.Concrete, shown in Fig. 7, circuit comprises: the first current regulation control module 131 and the second current regulation control module 132.
Described the first current regulation control module 131 is connected between described the first load branch and the second load branch; First signal input termination first load branch of described the first current regulation control module 131, secondary signal input termination second load branch of described the first current regulation control module 131, the current regulating module 121 of output termination second load branch of described the first current regulation control module 131.Described the first current regulation control module 131, for the current sampling signal of current sample module that receives the first load branch as first signal, with the current sampling signal of current regulating module that receives the second load branch as secondary signal, control the impedance of the current regulating module 121 of the second load branch, regulate the electric current of the second load branch.
Described the second current regulation control module 132 is connected between described the first load branch and the 3rd load branch; First signal input termination first load branch of described the second current regulation control module 132, secondary signal input termination the 3rd load branch of described the second current regulation control module 132, the current regulating module 122 of output termination the 3rd load branch of described the second current regulation control module 132.Described the second current regulation control module 132, for the current sampling signal of current sample module that receives the first load branch as first signal, with the current sampling signal of current regulating module that receives the 3rd load branch as secondary signal, control the impedance of the current regulating module 122 of the 3rd load branch, regulate the electric current of the 3rd load branch.
Described in each, current regulation control module can adopt foregoing any one embodiment of the embodiment of the present invention to realize.
When circuit comprises many load branch, can regulate as a reference with the electric current of any load branch wherein the electric current of other part or all of load branch.
The load branch being only required to be as a reference arranges a current sample module; The load branch being conditioned for needs arranges respectively a current regulating module and current regulation control module.Wherein, described current sample module can be a resistance; Described current regulating module can be an adjustment pipe and a resistance.
Described current regulation control module is corresponding one by one with the load branch that need to be conditioned; In other words, there is the load branch how many roads need to be conditioned just to need how many current regulation control modules.
Described in each current regulation control module be connected to load branch as a reference and the adjusting branch road that is attached thereto between, for the current sampling signal of the load branch with as a reference, regulate the electric current of the adjusting branch road being attached thereto.Described current regulation control module can adopt foregoing any one embodiment of the embodiment of the present invention to realize.
The current sampling signal of previous embodiment Jun Shi mono-road load branch, as with reference to signal, regulates the electric current of other each road load branch.In actual applications, can also using the current signal of multichannel loading branch road as with reference to signal, regulate the electric current of other load branch.The mean value of current sampling signal that can be by multichannel loading branch road, as the same reference signal of all adjusting branch roads, regulates the electric current of other all or part of load branch; Or the current sampling signal that can pass through multichannel loading branch road, respectively as a plurality of reference signals, regulates respectively the electric current of other all or part of load branch; Or aforementioned two kinds of modes are used in combination.
With reference to Fig. 8, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention seven.The Yi San of circuit shown in Fig. 8 road load is that example describes.Using the mean value of current sampling signal of the first load branch and the second load branch as with reference to signal, regulate the electric current of the 3rd load branch.Be, described the first load branch and the second load branch are reference arm, and described the 3rd load branch is for regulating branch road.
For described the first load branch and the second load branch current sample module 11 of connecting respectively.Described current sample module can be a resistance.
For described the 3rd load branch current regulating module 12 of connecting.Described current regulating module 12 can be an adjustment pipe and a resistance.
For described the 3rd load branch arranges a current regulation control module 13, the first load branch and the second load branch described in the first signal input termination of described current regulation control module 13, secondary signal input termination the 3rd load branch of described current regulation control module 13, the current regulating module 12 of the adjusting branch road that the output termination of described current regulation control module 13 is attached thereto.
Described current regulation control module 13, for receive the current sampling signal of current sample module of the first load branch and the second load branch the current sampling signal of current sample module as first signal, with the current sampling signal of current regulating module that receives the 3rd load branch as secondary signal, control the impedance of the current regulating module 12 of the 3rd load branch, regulate the electric current of the 3rd load branch.
When reference arm is two-way, the first input end of described current regulation control module 13 need to be connected with each reference arm by a resistance respectively.Concrete, as shown in Figure 8, the first input end of described current regulation control module 13 (being the normal phase input end of described the first operational amplifier IC1 in Fig. 8) is connected with the first load branch by a resistance R 21; The first input end of described current regulation control module 13 is connected with the second load branch by a resistance R 22.
Wherein, described current regulation control module 13 can adopt foregoing any one embodiment of the embodiment of the present invention to realize.
Preferably, shown in embodiment seven, in circuit, can also increase respectively for each load branch as a reference by a current-sharing unit, as shown in Figure 8, described current-sharing units in series is connected in each reference arm, for strengthening the current-sharing effect of described many output LED circuits.
The Yi San of circuit shown in Fig. 8 road load is that example describes.Wherein, using the mean value of electric current of two-way load branch as with reference to signal, regulate the electric current of Third Road load branch.
With reference to Fig. 9, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention eight.The difference of circuit shown in circuit shown in Fig. 9 and Fig. 8 is: comprise four road load branch.Using the mean value of the electric current of two-way load branch wherein as with reference to signal, regulate the electric current of other two-way load branch.
Concrete, using the first load branch and the second load branch as with reference to branch road, be described the first load branch and the second load branch current sample module of connecting respectively.
The 3rd load branch and the 4th load branch be for regulating branch road, is described the 3rd load branch and the 4th load branch current regulating module of connecting respectively.
Be respectively the 3rd load branch and the 4th load branch arranges a current regulation control module.As shown in Figure 9, comprise respectively the first current regulation control module 131 and the second current regulation control module 132.
It should be noted that, the first input end of the first current regulation control module 131 is connected with the first load branch, by a resistance R 22, is connected with the second load branch by a resistance R 21.
Equally, the first input end of the second current regulation control module 131 is connected with the first load branch, by a resistance R 22, is connected with the second load branch by a resistance R 21.
The specific implementation form of described the first current regulation control module and the second current regulating module is identical with embodiment seven, at this, no longer sets forth.
Preferably, shown in embodiment eight, in circuit, can also increase respectively for each load branch as a reference by a current-sharing unit, as shown in Figure 9, strengthen the current-sharing effect of described many output LED circuits.
With reference to Figure 10, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention nine.The difference of circuit shown in circuit shown in Figure 10 and Fig. 9 is: using the mean value of electric current of two-way load branch as with reference to signal, regulate the electric current of a remaining road load branch; Using the electric current of a road load branch wherein as with reference to signal, regulate the electric current of the load branch on remaining another road.
The connected mode of its circuit is similar to previous embodiment with principle, at this, no longer sets forth.
In previous embodiment of the present invention, be all to using the current sampling signal of a certain road or a few roads load branch as with reference to signal, regulate the electric current of other all or part of load branch.In actual applications, can also using the total current signal of all roads load branch as with reference to signal, regulate the electric current of other all or part of load branch.
With reference to Figure 11, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention ten.Circuit shown in Figure 11 is usingd the sampled signal of total load current as with reference to signal, regulates the electric current of a road load branch.
As shown in figure 11, circuit shown in comprises two-way load branch.Wherein, the electric current of the first load branch is Io1, and the electric current of the second load branch is Io2, and the total load current Io of this circuit is: Io=Io1+Io2.
In embodiment ten, the electric current that the sampled signal of total load current of this circuit of take regulates the first load branch describes as example.For described the first load branch current regulating module 101 of connecting.Described current regulating module 101 is connected with the LED load A1 of described the first load branch, and an end of described series arm is connected on an output of described constant-current source 10, and the other end connects another output of constant-current source 10 by total current sample circuit.
Described total current sample circuit (not shown in Figure 11) is connected on an output of described constant-current source 10, for exporting total current sampled signal Io.Described total current sample circuit can be a sampling resistor, current transformer or Hall element etc.
Described current regulating module 101 can be an adjustment pipe and a resistance; Can be as adjusted as shown in pipe S1 and the first resistance R 1 in Figure 11.Described resistance R 1 and described adjustment pipe S1 series connection; Described resistance R 1 is for the electric current of described the first load branch of sampling.
For described the first load branch arranges a current regulation control module 102.Described current regulation control module 102 is connected between the output and the first load branch of described constant-current source 10; Total current sample circuit described in the first signal input termination of described current regulation control module 102, secondary signal input termination first load branch of described current regulation control module 102, the current regulating module 101 of the first load branch described in the output termination of described current regulation control module 102.
Described current regulating module 102, for receiving the current sampling signal of the described constant-current source 10 total load current sampled signals of output and the current regulating module 101 of the first load branch, control the impedance of the current regulating module 101 of the first load branch, regulate the electric current of the first load branch.
In embodiment ten, using the sampled signal of total load current as with reference to signal, regulate the electric current of each load branch, can be proportional so that be conditioned electric current and the described total load current of load branch.
With reference to Figure 12, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 11.Circuit shown in Figure 12 is usingd the current sampling signal of total current as with reference to signal, regulates the electric current of two-way load branch.
As shown in figure 12, circuit shown in comprises two-way load branch.Wherein, the electric current of the first load branch is Io1, and the electric current of the second load branch is Io2, and the total current Io of this circuit is: Io=Io1+Io2.
In embodiment 11, the electric current that the sampled signal of total load current of this circuit of take regulates the first load branch and the second load branch describes as example.For described the first load branch and the second load branch current regulating module 101 of connecting respectively.Described current regulating module 101 can be an adjustment pipe and a resistance.
Be respectively described the first load branch and the second load branch one current regulation control module 102 is set.Each current regulation control module 102 is connected on respectively between the output and each load branch of described constant-current source 10, for the total load current with described constant-current source output as a reference, regulates respectively the electric current of the first load branch and the second load branch.
When circuit comprises N road load branch, can carry out as a reference with the total load current of this circuit the electric current of regulating load branch road.Wherein, can regulate by total load current the electric current of all load branch, also can only regulate the electric current of part load branch.
Concrete, the load branch being conditioned for the needs current regulating module of connecting.Wherein, described current regulating module can be an adjustment pipe and a resistance.
For each load branch that need to be conditioned arranges respectively a current regulation control module; Each current regulation control module is connected between the load branch that the output of constant-current source and needs are correspondingly conditioned.
With reference to Figure 13, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 12.Figure 13 is a kind of embodiment of current regulation control module shown in Figure 11.
Described total current sample circuit comprises: the 12 resistance R 12; Voltage in described the 12 resistance R 12 is total current sampled signal Io.
Described current regulation control module comprises: the 3rd operational amplifier IC3, the 11 resistance R 11, the second capacitor C 2, four-operational amplifier IC4, the 13 resistance R the 13, the 14 resistance R the 14, the 15 resistance R the 15, the 16 resistance R 16.
Wherein, the inverting input of described four-operational amplifier IC4 connects one end of the 12 resistance R 12 through the 15 resistance R 15, the normal phase input end of described four-operational amplifier IC4 connects the other end of described the 12 resistance R 12 through the 14 resistance R 14, the normal phase input end of the 3rd operational amplifier IC3 described in the output termination of described four-operational amplifier IC4.
The 16 resistance R 16 series connections are between the inverting input and output of described four-operational amplifier IC4; The 13 resistance R 13 series connections are between the normal phase input end of described four-operational amplifier IC4 and the reference ground of described four-operational amplifier IC4.
The first load branch described in the anti-phase input termination of described the 3rd operational amplifier IC3, the control end of the current regulating module of the first load branch described in the output termination of described the 3rd operational amplifier IC3.
After described the 11 resistance R 11 and the second capacitor C 2 series connection, form compensating network, be connected between the inverting input and output of described the 3rd operational amplifier IC3.
Wherein, described four-operational amplifier IC4, the 13 resistance R the 13, the 14 resistance R the 14, the 15 resistance R the 15, the 16 resistance R 16 form differential amplifier circuit, and its output is received the normal phase input end of described the 3rd operational amplifier IC3 as current reference signal.Described four-operational amplifier IC4 by the current signal of described the first load branch and described current reference signal relatively after, output drive signal is to the control end of described adjustment pipe S1, control the impedance magnitude of described adjustment pipe S1, and then regulate electric current on the first load branch.Circuit reaches after stable state, and making the electric current I o1 of described the first load branch and the ratio of total load current Io is predefined ratio k; Described ratio k is determined jointly by the resistance of the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R the 13, the 14 resistance R the 14, the 15 resistance R 15, the 16 resistance R 16.
When meeting: when R15=R14, R13=R16, the electric current I o1 of the first load branch with the ratio of total load current Io is:
k＝Io1/Io＝(R13/R14)*(R12/R1)。
Certainly, in actual applications, described compensating network can be not limited to the way of realization shown in Figure 13, can be any loop compensation network.This part is the known technology of this area, does not repeat them here.
With reference to Figure 14, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 13.Figure 14 is the another kind of embodiment of current regulation control module shown in Figure 11.
The difference of current regulating module shown in Figure 14 and Figure 13 is: also comprise the 17 adjustable resistance R17.
Described total current sample circuit comprises: the 12 resistance R 12; Voltage in described the 12 resistance R 12 is total current sampled signal Io.
Described current regulation control module comprises: the 3rd operational amplifier IC3, the 11 resistance R 11, the second capacitor C 2, four-operational amplifier IC4, the 13 resistance R the 13, the 14 resistance R the 14, the 15 resistance R the 15, the 16 resistance R the 16, the 17 adjustable resistance R17.
Wherein, two stiff ends of described the 17 adjustable resistance R17 are connected on respectively described the 12 resistance R 12 two ends.
The inverting input of described four-operational amplifier IC4 connects the adjustable end of described the 17 adjustable resistance R17 through the 15 resistance R 15, the normal phase input end of described four-operational amplifier IC4 connects a stiff end of the 17 resistance through the 14 resistance R 14, the normal phase input end of the 3rd operational amplifier IC3 described in the output termination of described four-operational amplifier IC4.
Described the 16 resistance R 16 series connections are between the inverting input and output of described four-operational amplifier IC4; Described the 13 resistance R 13 series connections are between the normal phase input end of described four-operational amplifier IC4 and the reference ground of described four-operational amplifier.
The first load branch described in the anti-phase input termination of described the 3rd operational amplifier IC3, the control end of the current regulating module of the first load branch described in the output termination of described the 3rd operational amplifier IC3.
After described the 11 resistance R 11 and the second capacitor C 2 series connection, form compensating network, be connected between the inverting input and output of described the 3rd operational amplifier IC3.
Described in the embodiment of the present invention 13, circuit is identical with embodiment 12 to the Principles of Regulation of the electric current of the first load branch.Be the no longer predefined ratio k for fixing of the electric current I o1 of described the first load branch and the ratio of total load current Io, but a variable value.Be, can according to actual needs, by regulating the sliding end of described the 17 adjustable resistance R17, regulate the electric current I o1 of described the first load branch and the ratio of total load current Io.
It should be noted that, described the 17 adjustable resistance R17 can pass through manual adjustments.
With reference to Figure 15, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 14.Figure 15 is the third embodiment of current regulation control module shown in Figure 11.
Difference shown in the module of current regulation control shown in Figure 15 and Figure 13 is: also comprise filter unit 130, the second metal-oxide-semiconductor S12, the 18 resistance R 18.
Described total current sample circuit comprises: the 12 resistance R 12; Voltage in described the 12 resistance R 12 is total current sampled signal Io.
Described current regulation control module comprises: the 3rd operational amplifier IC3, the 11 resistance R 11, the second capacitor C 2, four-operational amplifier IC4, the 13 resistance R the 13, the 14 resistance R the 14, the 15 resistance R the 15, the 16 resistance R 16, filter unit, the second metal-oxide-semiconductor S12, the 18 resistance R 18.
Wherein, the hot end of the 12 resistance R 12 described in one end of described the 18 resistance R 18, another termination of described the 18 resistance R 18 connects the drain electrode of described the second metal-oxide-semiconductor S12, the source electrode of described the second metal-oxide-semiconductor S12 connects the cold end of described the 12 resistance R 12, and the gate pole of described the second metal-oxide-semiconductor S12 meets control signal V1.
Two inputs of described filter unit connect respectively the drain-source utmost point and the ground of described the second metal-oxide-semiconductor S12, an output of described filter unit 130 connects the reversed-phase output of four-operational amplifier IC4 through the 15 resistance R 15, another output of described filter unit 130 connects the normal phase input end of four-operational amplifier IC4 through the 14 resistance R 14.
The normal phase input end of the 3rd operational amplifier IC3 described in the output termination of described four-operational amplifier IC4.
Described the 16 resistance R 16 series connections are between the inverting input and output of described four-operational amplifier IC4; Described the 13 resistance R 13 series connections are between the normal phase input end of described four-operational amplifier IC4 and the reference ground of described four-operational amplifier.
The first load branch described in the anti-phase input termination of described the 3rd operational amplifier IC3, the control end of the current regulating module of the first load branch described in the output termination of described the 3rd operational amplifier IC3.
After described the 11 resistance R 11 and the second capacitor C 2 series connection, form compensating network, be connected between the inverting input and output of described the 3rd operational amplifier IC3.
Described in the embodiment of the present invention 14, circuit is identical with embodiment 12 to the Principles of Regulation of the electric current of the first load branch.Be the no longer predefined ratio k for fixing of the electric current I o1 of described the first load branch and the ratio of total load current Io, but a variable value.The S2 of metal-oxide-semiconductor described in Fig. 5 is operated on off state, by regulating the conducting duty ratio of described the second metal-oxide-semiconductor S12, can change the mean value of described total load current Io after described filter unit, thereby realize the electric current I o1 of described the first load branch and the ratio of total load current Io is adjustable.
It should be noted that, the gate pole control signal V1 of described the second metal-oxide-semiconductor S12 can be the control signal of analog circuit or digital circuit output.Wherein, digital circuit if, described digital circuit can be accepted user interface control,
Three kinds of embodiments of described current regulation control module have more than been provided.Certainly, the realization of described current regulation control module is not limited to above-mentioned three kinds of modes.In other embodiments of the invention, described current regulation control module can also realize by other means.
With reference to Figure 16, be the LED constant current driving circuit figure of many outputs of the embodiment of the present invention 15.Embodiment illustrated in fig. 16 15 are with embodiment illustrated in fig. 12 11 difference: on the output bus of described constant-current source, be in series with switching tube S11.
Described switching tube S11 is operated in copped wave state, and making the electric current of constant-current source output is DC pulse current.By changing the copped wave duty ratio of described switching tube S11, can change the size of constant-current source output current mean value, thereby realize the variation of the brightness of LED load in each load branch.
Circuit shown in Figure 16 also can be realized the current sampling signal of Yi Yi road load branch as with reference to signal, regulates the electric current of other road load branch.Meanwhile, the module of current regulation control shown in Figure 16 can adopt the foregoing three kinds of embodiments of the embodiment of the present invention to realize.
Above to a kind of LED constant current driving circuits of exporting provided by the present invention more, be described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.

Claims (14)

1. more than, a LED constant current driving circuit for output, is characterized in that, described circuit comprises: a constant-current source; Described constant-current source is with two-way load branch at least;
Using at least one road load branch as with reference to branch road, all the other all or part of load branch are for regulating branch road;
Wei Mei road reference arm arranges respectively a current sample module; The LED load series connection of described current sample module and reference arm is at the output of described constant-current source;
Wei Mei road regulates branch road that one current regulating module and current regulation control module are set respectively; Described current regulating module and the output that regulates the LED load series connection of branch road at described constant-current source;
The first signal input of described current regulation control module directly connects or connects at least one road reference arm by resistance, secondary signal input termination one tunnel of described current regulation control module regulates branch road, the current regulating module of the adjusting branch road that the output termination of described current regulation control module is attached thereto;
Described current regulation control module, for the current sampling signal of current sample module that receives each reference arm being attached thereto as first signal, with receive to regulate the current sampling signal of current regulating module of branch road as secondary signal, the impedance of the current regulating module of the adjusting branch road that control is attached thereto, the electric current of the adjusting branch road that adjusting is attached thereto.
2. the LED constant current driving circuit of many outputs according to claim 1, is characterized in that, described first signal and described secondary signal have common reference end, the negative output terminal that described common reference end is constant-current source;
Described current regulating module comprises: the first operational amplifier, compensating network;
First signal is input to the in-phase input end of described the first operational amplifier, and secondary signal is input to the inverting input of described the first operational amplifier, and the output of described the first operational amplifier is as the output of described current regulation control module;
Described compensating network is connected between the inverting input and output of described operational amplifier.
3. the LED constant current driving circuit of many outputs according to claim 1, is characterized in that, described first signal and described secondary signal have common reference end, the negative output terminal that described common reference end is constant-current source;
Described current regulation control module comprises: the first operational amplifier, compensating network, the 5th adjustable resistance;
One end of described the 5th adjustable resistance is as the first signal input of described current regulation control module, another termination common reference end of described the 5th adjustable resistance;
The in-phase input end of described the first operational amplifier connects the sliding end of described the 5th adjustable resistance, secondary signal is input to the inverting input of described the first operational amplifier, and the output of described the first operational amplifier is as the output of described current regulation control module;
Described compensating network is connected between the inverting input and output of described the first operational amplifier.
4. the LED constant current driving circuit of many outputs according to claim 1, is characterized in that, described first signal and described secondary signal have common reference end, the negative output terminal that described common reference end is constant-current source;
Described current regulation control module comprises: the first operational amplifier, compensating network, the 6th resistance, filter unit, the first metal-oxide-semiconductor;
One end of described the 6th resistance is as the first signal input of described current regulation control module, the drain electrode of the first metal-oxide-semiconductor described in another termination of described the 6th resistance; The source electrode of described the first metal-oxide-semiconductor connects common reference end, and the gate pole of described the first metal-oxide-semiconductor connects control signal;
The input of described filter unit connects the drain-source utmost point of described the first metal-oxide-semiconductor, the in-phase input end of first output termination the first operational amplifier of described filter unit, the second output termination common reference end of described filter unit;
Secondary signal is input to the inverting input of described the first operational amplifier, and the output of described the first operational amplifier is as the output of described current regulation control module;
Described compensating network is connected between the inverting input and output of described the first operational amplifier.
5. the LED constant current driving circuit of many outputs according to claim 1, is characterized in that, described current sample module is a resistance.
6. the LED constant current driving circuit of many outputs according to claim 1, is characterized in that, described current regulating module is that a resistance and one is adjusted pipe; Described resistance and described adjustment pipe string connection; Described resistance is for the electric current of this adjusting branch road of sampling; Described adjustment pipe comprises three ends, and one of them is control end, and all the other two is non-control end; Described adjustment pipe, by the size of control end input signal, regulates two impedance magnitude between non-control end.
7. according to the LED constant current driving circuit of the many outputs described in claim 1 to 6 any one, it is characterized in that, on the output bus of described constant-current source, be in series with switching tube.
8. according to the LED constant current driving circuit of the many outputs described in claim 1 to 6 any one, it is characterized in that, when the first input end of described current regulation control module is connected to few two-way reference arm Shi，Wei Mei road reference arm, one current-sharing unit is set; The LED load series connection of described current-sharing unit and described current sample module, reference arm is between described constant-current source and ground;
The first input end of described current regulation control module is connected with each reference arm by a resistance respectively.
9. more than, a LED constant current driving circuit for output, is characterized in that, described circuit comprises: a constant-current source; Described constant-current source is with two-way load branch at least; Wherein at least one load branch is for regulating branch road;
For each regulates branch road, one current regulating module and current regulation control module are set respectively; Described current regulating module is connected with regulating the LED load of branch road, and an end of described series arm is connected on an output of described constant-current source, and the other end connects another output of constant-current source by total current sample circuit;
Described total current sample circuit output total current sampled signal;
Total current sample circuit described in the first signal input termination of described current regulation control module, secondary signal input termination one tunnel of described current regulation control module regulates branch road, the current regulating module of the adjusting branch road that the output termination of described current regulation control module is attached thereto;
Described current regulating module, for receiving the current sampling signal of total load current sampled signal with the current regulating module of the adjusting branch road being attached thereto of described constant-current source output, the impedance of the current regulating module of the adjusting branch road that control is attached thereto, the electric current of the adjusting branch road that adjusting is attached thereto.
10. the LED constant current driving circuit of many outputs according to claim 9, is characterized in that, described total current sample circuit comprises the 12 resistance, and described the 12 ohmically voltage is total current sampled signal;
Described current regulation control module comprises:
The inverting input of four-operational amplifier connects one end of described the 12 resistance through the 15 resistance, the normal phase input end of described four-operational amplifier connects the other end of described the 12 resistance through the 14 resistance, the normal phase input end of output termination the 3rd operational amplifier of described four-operational amplifier;
The 16 resistance series connection is between the inverting input and output of described four-operational amplifier; The 13 resistance series connection is between the normal phase input end of described four-operational amplifier and the reference ground of described four-operational amplifier;
Described in the anti-phase input termination of described the 3rd operational amplifier, regulate branch road, regulate the control end of the current regulating module of branch road described in the output termination of described the 3rd operational amplifier;
Compensating network is connected between the inverting input and output of described the 3rd operational amplifier.
The LED constant current driving circuit of 11. many outputs according to claim 9, is characterized in that, described total current sample circuit comprises the 12 resistance, and described the 12 ohmically voltage is total current sampled signal;
Described current regulation control module comprises:
Two stiff ends of the 17 adjustable resistance are connected on respectively the 12 resistance two ends;
The inverting input of four-operational amplifier connects the adjustable end of described the 17 adjustable resistance through the 15 resistance, the normal phase input end of described four-operational amplifier connects a stiff end of the 17 resistance through the 14 resistance, the normal phase input end of output termination the 3rd operational amplifier of described four-operational amplifier;
The 16 resistance series connection is between the inverting input and output of described four-operational amplifier; The 13 resistance series connection is between the normal phase input end of described four-operational amplifier and the reference ground of described four-operational amplifier;
Described in the anti-phase input termination of described the 3rd operational amplifier, regulate branch road, regulate the control end of the current regulating module of branch road described in the output termination of described the 3rd operational amplifier;
Compensating network is connected between the inverting input and output of described the 3rd operational amplifier.
The LED constant current driving circuit of 12. many outputs according to claim 9, is characterized in that, described total current sample circuit comprises the 12 resistance, and described the 12 ohmically voltage is total current sampled signal;
Described current regulation control module comprises:
The hot end of the 12 resistance described in one termination of the 18 resistance, the drain electrode of another termination the second metal-oxide-semiconductor of described the 18 resistance, the source electrode of described the second metal-oxide-semiconductor connects the cold end of described the 12 resistance, and the gate pole of described the second metal-oxide-semiconductor connects control signal;
Two inputs of filter unit connect respectively the drain-source utmost point of described the second metal-oxide-semiconductor, an output of described filter unit connects the reversed-phase output of four-operational amplifier through the 15 resistance, another output of described filter unit connects the normal phase input end of four-operational amplifier through the 14 resistance;
The normal phase input end of output termination the 3rd operational amplifier of described four-operational amplifier;
The 16 resistance series connection is between the inverting input and output of described four-operational amplifier; The 13 resistance series connection is between the normal phase input end of described four-operational amplifier and the reference ground of described four-operational amplifier;
Adjustable branch road described in the anti-phase input termination of described the 3rd operational amplifier, the control end of the current regulating module of adjustable branch road described in the output termination of described the 3rd operational amplifier;
Described compensating network is connected between the inverting input and output of described the 3rd operational amplifier.
The LED constant current driving circuit of 13. many outputs according to claim 9, is characterized in that, described current regulating module is that a resistance and one is adjusted pipe; Described resistance and described adjustment pipe string connection; Described resistance is for the electric current of this adjusting branch road of sampling; Described adjustment pipe comprises three ends, and one of them is control end, and all the other two is non-control end; Described adjustment pipe, by the size of control end input signal, regulates two impedance magnitude between non-control end.
14. according to the LED constant current driving circuit of the many outputs described in claim 9 to 13 any one, it is characterized in that, on the output bus of described constant-current source, is in series with switching tube.
CN201110002850.1A 2011-01-07 2011-01-07 Multi-output LED (Light-Emitting Diode) constant-current driving circuit Active CN102595680B (en)

Priority Applications (2)

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CN201110002850.1A CN102595680B (en) 2011-01-07 2011-01-07 Multi-output LED (Light-Emitting Diode) constant-current driving circuit
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CN109155344B (en) * 2016-05-26 2021-06-01 夏普株式会社 Light emitting device and lighting device
CN106898310B (en) * 2017-03-21 2019-03-01 京东方科技集团股份有限公司 A kind of circuit, backlight, display device for expanding LED quantity
CN108882469A (en) * 2018-09-10 2018-11-23 帝奥微电子有限公司 Colour temperature controls driving circuit
CN114205970A (en) * 2021-12-13 2022-03-18 英飞特电子（杭州）股份有限公司 Driving circuit

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