CN207884930U - Multichannel Light-emitting diode LED driving circuit - Google Patents
Multichannel Light-emitting diode LED driving circuit Download PDFInfo
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- CN207884930U CN207884930U CN201721864522.1U CN201721864522U CN207884930U CN 207884930 U CN207884930 U CN 207884930U CN 201721864522 U CN201721864522 U CN 201721864522U CN 207884930 U CN207884930 U CN 207884930U
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Abstract
The utility model provides a kind of multichannel Light-emitting diode LED driving circuit, which includes：Constant voltage source, at least one first LED branches, at least one 2nd LED branches and the corresponding positive voltage source of each 2nd LED branches；The pressure drop of first LED branches is less than predetermined threshold value；The pressure drop of 2nd LED branches is more than predetermined threshold value；Wherein, the anode of constant voltage source is connect with the cathode of the input terminal of the first LED branches and positive voltage source respectively；The cathode of constant voltage source is grounded；The output end of first LED branches is grounded；The anode of positive voltage source is connect with the input terminal of the 2nd LED branches, and the output end ground connection of the 2nd LED branches, positive voltage source is used to provide offset voltage for the 2nd LED branches.Multichannel Light-emitting diode LED driving circuit provided by the utility model realizes the normal work of the smaller LED branches of pressure drop, improves the driving effect of LED multi-path while not influencing pressure drop larger LED branches power consumption.
Description
Technical field
The utility model is related to LED technology field more particularly to a kind of multichannel Light-emitting diode LED driving circuits.
Background technology
Light emitting diode (Light Emitting Diode, abbreviation LED) lamps and lanterns have long lifespan, light efficiency height, shock resistance, low
The advantages that energy consumption, belongs to the energy conservation and environmental protection 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, DC power supply-DC power supply (Direct Current-Direct are typically used
Current abbreviation DC-DC) constant voltage source and equivalent output capacitance drive LED multi-path.Include the first LED branches with LED multi-path
For the 2nd LED branches, if the voltage of the first LED branches is more than the voltage of the 2nd LED branches, and the first LED branches and the
Two LED branch alternate conductions, when the first LED branches are connected, the instantaneous voltage of equivalent output capacitance is the electricity of the first LED branches
Pressure, and larger voltage is provided for the first LED branches, when switching to the 2nd LED branches by the first LED branches, due to second
The voltage of LED branches is less than the voltage of the first LED branches, then is the 2nd LED branches by the instantaneous voltage of equivalent output capacitance
When voltage is provided, there are voltage overshoot, and the excessive phenomenon of electric current in the 2nd LED branches, in this process, equivalent output capacitance
Instantaneous voltage become the voltage of the second LED circuit；When switching to the first LED branches by the 2nd LED branches again, due to first
The voltage of LED branches is more than the 2nd LED branches, then provides electricity by the instantaneous voltage of equivalent output capacitance for the first LED branches
When pressure, there are undertensions, and electric current rises slow phenomenon in the first LED branches.
Therefore, using existing LED multi-path type of drive so that the driving effect of LED multi-path is bad.
Utility model content
The utility model provides a kind of multichannel Light-emitting diode LED driving circuit, is not influencing the larger LED branches work(of pressure drop
While consumption, the normal work of the smaller LED branches of pressure drop is realized, to improve the driving effect of LED multi-path.
The utility model embodiment provides a kind of multichannel Light-emitting diode LED driving circuit, including：
Constant voltage source, drive sub-circuits, equivalent output capacitance, the first LED branches and the 2nd LED branches, the first LED
The voltage of branch is more than the voltage of the 2nd LED branches, and the 2nd LED branches include the first boost pressure circuit；
The first end and second end of the constant voltage source is connect with the first end and second end of the drive sub-circuits respectively,
The third end of the drive sub-circuits respectively with the first end of the equivalent output capacitance, the first end of the first LED branches
And the first end connection of the 2nd LED branches；4th end of the drive sub-circuits respectively with the equivalent output capacitance
The second end of second end, the second end of the first LED branches and the 2nd LED branches connects；
First boost pressure circuit is used to compensate the voltage of the 2nd LED branches, so that the electricity of the 2nd LED branches
Pressure and the voltage of the first LED branches meet predetermined threshold value.
In one embodiment of the utility model, the first LED branches also include the second boost pressure circuit, second supercharging
Circuit does not work.
In one embodiment of the utility model, boost pressure circuit is semiconductcor field effect transistor, and the LED drive circuit also wraps
Include sampling hold circuit and error amplifying circuit；
The first LED branches include the first LED and the first semiconductcor field effect transistor, and the 2nd LED branches include
2nd LED and the second semiconductcor field effect transistor, the input terminal of the first LED connect with the first end of the equivalent output capacitance
It connects, the output end of the first LED is connect with the first end of first semiconductcor field effect transistor, first semiconductcor field
The second end of effect transistor is connect with the second end of the equivalent output capacitance, the third of first semiconductcor field effect transistor
The first pulse width modulation (PWM) signal of end input；The input terminal of 2nd LED connects with the first end of the equivalent output capacitance
It connects, the output end of the 2nd LED is connect with the first end of second semiconductcor field effect transistor, second semiconductcor field
The second end of effect transistor is connect with the second end of the equivalent output capacitance, the third of second semiconductcor field effect transistor
End is connect with the output end of the error amplifying circuit, and the first input end of the error amplifying circuit keeps electricity with the sampling
Road connects, the second input terminal input reference voltage or reference current of the error amplifying circuit；
The sampling hold circuit amplifies electricity for acquiring predetermined current and the predetermined current being input to the error
Road；The error amplifying circuit is used to export the second pwm signal according to predetermined current, to be controlled by second pwm signal
Second semiconductcor field effect transistor compensates the voltage of the 2nd LED branches.
In one embodiment of the utility model, the first LED branches further include first switch, the 2nd LED branches
It further include second switch；
The first end of the first switch is connect with the second end of first semiconductcor field effect transistor, and described first opens
The second end of pass is connect with the second end of the equivalent output capacitance；
The second end of the second switch is connect with the second end of second semiconductcor field effect transistor, and described second opens
The second end of pass is connect with the second end of the equivalent output capacitance.
In one embodiment of the utility model, which further includes third switch；
The first end of third switch is connect with the error amplifying circuit, the second end that the third switchs with it is described
The third end of second semiconductcor field effect transistor connects.
The utility model embodiment also provides a kind of multichannel Light-emitting diode LED driving method, including：
When the voltage of the first LED branches is more than the voltage of the 2nd LED branches, increased by first in the 2nd LED branches
Volt circuit compensates the voltage of the 2nd LED branches, so that the voltage of the 2nd LED branches and the first LED branches
Voltage meets predetermined threshold value.
In one embodiment of the utility model, before the voltage that the 2nd LED branches are compensated by boost pressure circuit,
Further include：
Determine that the voltage of the first LED branches is more than the voltage of the 2nd LED branches.
In one embodiment of the utility model, the first LED branches include the first LED, and the 2nd LED branches include
2nd LED branches, then the voltage of the determination the first LED branches be more than the 2nd LED branches voltage, including：
It is connected in the first LED branches, and when the 2nd LED branches disconnection, detects the electric current of the first LED；
It is connected in the 2nd LED branches, and when the first LED branches disconnection, detects the electric current of the 2nd LED；
If the electric current of the first LED is less than the electric current of the 2nd LED, it is determined that the voltage of the first LED branches
More than the voltage of the 2nd LED branches.
In one embodiment of the utility model, the first LED branches further include the second boost pressure circuit, then the determining institute
The voltage for stating the first LED branches is more than the voltage of the 2nd LED branches, including：
Within a preset period of time, the first LED branches and the 2nd LED branches conducting, obtain the preset time
The electric current of first LED or the electric current or described first of voltage and the 2nd LED at second boost pressure circuit in section
Voltage at boost pressure circuit；
If voltage of the electric current of the first LED less than the electric current of the 2nd LED or at second boost pressure circuit is small
Voltage at first boost pressure circuit, it is determined that the voltage of the first LED branches is more than the electricity of the 2nd LED branches
Pressure.
In one embodiment of the utility model, first boost pressure circuit by the 2nd LED branches compensates described the
The voltage of two LED branches, including：
When the 2nd LED branches are connected, the peak point current of the 2nd LED branches is detected；According to the 2nd LED
The peak point current and reference current of branch control the voltage that first boost pressure circuit compensates the 2nd LED branches；
Or；
It is connected in the first LED branches, and in the period of the 2nd LED branches disconnection, obtains the first LED
The average current of branch；It is connected in the 2nd LED branches, and in the period of the first LED branches disconnection, described in acquisition
The average current of 2nd LED branches；According to the average current of the first LED branches and the reference current, or according to described
The average current and the reference current of 2nd LED branches control first boost pressure circuit and compensate the 2nd LED branches
Voltage.
The multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides, including：Constant voltage source, driving
The voltage of circuit, equivalent output capacitance, the first LED branches and the 2nd LED branches, the first LED branches is more than the 2nd LED branches
Voltage, and the 2nd LED branches include the first boost pressure circuit；The first end and second end of constant voltage source respectively with drive sub-circuits
First end and second end connection, the third ends of drive sub-circuits respectively with the first end of equivalent output capacitance, the first LED branches
First end and the 2nd LED branches first end connection；4th end of drive sub-circuits respectively with equivalent output capacitance second
The second end connection at end, the second end of the first LED branches and the 2nd LED branches；First boost pressure circuit is for compensating the 2nd LED branch
The voltage on road, so that the voltage of the 2nd LED branches and the voltage of the first LED branches meet predetermined threshold value.It can be seen that in this reality
With in new embodiment, by the way that the first boost pressure circuit is arranged in the lower 2nd LED branches of voltage so that can by this
One boost pressure circuit supplements the voltage of the 2nd LED branches so that the voltage of the 2nd LED branches is equal with the voltage of the first LED branches
Or approximately equal so that when being switched between the first LED branches and the 2nd LED branches, avoid electric current it is excessive or
Electric current rises slow phenomenon, while not influencing pressure drop larger LED branches power consumption, realizes the smaller LED branches of pressure drop
Normal work, to improve the driving effect of LED multi-path.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art does one and simply introduces, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model, for those of ordinary skill in the art, in the premise of not making the creative labor property
Under, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of structural schematic diagram for multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides；
Fig. 2 is that a kind of voltage for the first LED branches of determination that the utility model embodiment provides is more than the 2nd LED branches
The schematic diagram of voltage；
Fig. 3 is that the another kind that the utility model embodiment provides determines that the voltage of the first LED branches is more than the 2nd LED branches
Voltage schematic diagram；
Fig. 4 is the structural representation for another multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides
Figure；
Fig. 5 is the structural representation for another multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides
Figure；
Fig. 6 is the structural representation for another multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides
Figure；
Fig. 7 is the structural representation for another multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides
Figure；
Fig. 8 is a kind of schematic diagram for multichannel Light-emitting diode LED driving method that the utility model embodiment provides.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
Term " first ", " second ", " third " in the specification and claims of the utility model and above-mentioned attached drawing,
(if present)s such as " the 4 " are for distinguishing similar object, without being used to describe specific sequence or precedence.It answers
The data that the understanding uses in this way can be interchanged in the appropriate case, so as to the embodiments of the present invention described herein, example
As can with shown in herein or description those of other than sequence implement.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 those of are not necessarily limited to clearly to list step or unit, but may include not listing clearly
Or for these processes, method, product or equipment intrinsic other steps 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 schematic diagram for multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides,
Certainly, the utility model embodiment is only illustrated by taking Fig. 1 as an example, but is not represented the utility model and be limited only to this.Please
Shown in Figure 1, which may include：
Constant voltage source, drive sub-circuits, equivalent output capacitance, the first LED branches and the 2nd LED branches, the first LED branches
Voltage be more than the voltage of the 2nd LED branches, and the 2nd LED branches include the first boost pressure circuit.
The first end and second end of constant voltage source is connect with the first end and second end of drive sub-circuits respectively, drives son electricity
The third end on road respectively with the first end of equivalent output capacitance, the first end of the first end of the first LED branches and the 2nd LED branches
Connection；4th end of drive sub-circuits respectively with the second end of equivalent output capacitance, the second end and second of the first LED branches
The second end of LED branches connects.
First boost pressure circuit is used to compensate the voltage of the 2nd LED branches, so that the voltage and the first LED of the 2nd LED branches
The voltage of branch meets predetermined threshold value.
Wherein, predetermined threshold value can be configured according to actual needs, if can meet the voltage of the 2nd LED branches with
The voltage of the first LED branches is equal or approximately equal.
It can be seen that in the utility model embodiment, increased by the way that first is arranged in the lower 2nd LED branches of voltage
Volt circuit so that the voltage of the 2nd LED branches can be supplemented by first boost pressure circuit so that the voltage of the 2nd LED branches
It is equal or approximately equal with the voltage of the first LED branches, so that being carried out between the first LED branches and the 2nd LED branches
When switching, avoid that electric current is excessive or electric current rises slow phenomenon, while not influencing pressure drop larger LED branches power consumption,
The normal work for realizing the smaller LED branches of pressure drop, to improve the driving effect of LED multi-path.
The multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides, including：Constant voltage source, driving
The voltage of circuit, equivalent output capacitance, the first LED branches and the 2nd LED branches, the first LED branches is more than the 2nd LED branches
Voltage, and the 2nd LED branches include the first boost pressure circuit；The first end and second end of constant voltage source respectively with drive sub-circuits
First end and second end connection, the third ends of drive sub-circuits respectively with the first end of equivalent output capacitance, the first LED branches
First end and the 2nd LED branches first end connection；4th end of drive sub-circuits respectively with equivalent output capacitance second
The second end connection at end, the second end of the first LED branches and the 2nd LED branches；First boost pressure circuit is for compensating the 2nd LED branch
The voltage on road, so that the voltage of the 2nd LED branches and the voltage of the first LED branches meet predetermined threshold value.It can be seen that in this reality
With in new embodiment, by the way that the first boost pressure circuit is arranged in the lower 2nd LED branches of voltage so that can by this
One boost pressure circuit supplements the voltage of the 2nd LED branches so that the voltage of the 2nd LED branches is equal with the voltage of the first LED branches
Or approximately equal so that when being switched between the first LED branches and the 2nd LED branches, avoid electric current it is excessive or
Electric current rises slow phenomenon, while not influencing pressure drop larger LED branches power consumption, realizes the smaller LED branches of pressure drop
Normal work, to improve the driving effect of LED multi-path.
It is the voltage for predefining the first LED branches it should be noted that in the technical solution shown in above-described embodiment
More than the voltage of the 2nd LED branches, if can not determine the big of the voltage of the first LED branches and the voltage of the 2nd LED branches in advance
It is small, then it needs that the first boost pressure circuit is arranged in the 2nd LED branches, and the second boost pressure circuit is arranged in the first LED branches, i.e.,
When not knowing the voltage value of each branch, need that a boost pressure circuit is arranged in each branch.It is set in each branch
Set one increase voltage after, can by comparing the first LED branches voltage and the 2nd LED branches voltage, so that it is determined that
The smaller branch of voltage, then the boost pressure circuit work in the smaller branch of voltage at this time, to compensate the smaller branch of the voltage, and
Boost pressure circuit in the larger branch of voltage does not work then.Optionally, it is more than the 2nd LED in the voltage for determining the first LED branches
When the voltage of branch, it can be realized by following two kinds of possible modes：
In the first possible implementation, it is connected in the first LED branches, and when the 2nd LED branches disconnect, detection the
The electric current of the first LED in one LED branches；It is connected in the 2nd LED branches, and when the disconnection of the first LED branches, detects the 2nd LED
The electric current of the 2nd LED in branch；If the electric current of the first LED is less than the electric current of the 2nd LED, it is determined that the electricity of the first LED branches
Voltage of the pressure more than the 2nd LED branches.
Specifically, when being switched over to LED branches, disconnect in the first high LED branches of voltage, second that voltage is low
The moment of LED branches conducting, overshoot current is had in the 2nd LED branches of low electricity；Disconnect in low the 2nd LED branches of voltage,
Moment is connected in the first high LED branches of voltage, and electric current can slowly rise in the first LED branches of high voltage, compare this two branch
The maximum value of road electric current can be true if the maximum current max1 of the first LED is less than the maximum current max2 of the 2nd LED
The voltage of fixed first LED branches is more than the voltage of the 2nd LED branches.Shown in Figure 2, Fig. 2 is the utility model embodiment
A kind of voltage of the first LED branches of determination provided is more than the schematic diagram of the voltage of the 2nd LED branches.
In second of possible realization method, within a preset period of time, the first LED branches and the conducting of the 2nd LED branches,
Obtain the electric current of the first LED or the electric current of voltage and the 2nd LED at the second boost pressure circuit or the first supercharging in preset time period
Voltage at circuit；If electric current of the electric current of the first LED less than the 2nd LED or the voltage at the second boost pressure circuit are less than first
Voltage at boost pressure circuit, it is determined that the voltage of the first LED branches is more than the voltage of the 2nd LED branches.
Wherein, preset time period can be any value in 100ms to 200ms, can specifically be set according to actual needs
It sets, as long as not influencing the experience of user.
Specifically, the first LED branches and the 2nd LED branches are connected within a preset period of time when powering on, enter later normal
PWM operating modes, within a preset period of time, the first boost pressure circuit and the second boost pressure circuit do not work, and flow through the first LED branch
The electric current of road and the 2nd LED branches is all direct current, then can directly compare the first LED branches and the electric current of the 2nd LED branches is big
It is small, it can also be by comparing the superchargings of voltage K2 or first at the voltage K1 and the second boost pressure circuit at the first boost pressure circuit
The voltage K4 at K3 and the second boost pressure circuit at circuit determines that, because K1 with K2 earth impedance is identical, K3 and K4 are to ground resistance
It is anti-identical, if electric current or the voltage K1 at the first boost pressure circuit that the electric current of the first LED branches is less than the 2nd LED branches
It is less than the voltage K4 at the second boost pressure circuit less than the K3 at the voltage K2 or the first boost pressure circuit at the second boost pressure circuit,
It can so determine that the voltage of the first LED branches is more than the voltage of the 2nd LED branches.Shown in Figure 3, Fig. 3 is this practicality
The another kind that new embodiment provides determines that the voltage of the first LED branches is more than the schematic diagram of the voltage of the 2nd LED branches.
The voltage that the first LED branches are determined by two kinds of possible realization methods be more than the 2nd LED branches voltage it
Afterwards, the first boost pressure circuit work of the 2nd LED branches, the second boost pressure circuit work of the first LED branches, example can be controlled
, shown in Figure 4, Fig. 4 is another multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides
Structural schematic diagram.
Boost pressure circuit is semiconductcor field effect transistor, and LED drive circuit further includes sampling hold circuit and error amplification electricity
Road.
First LED branches include the first LED and the first semiconductcor field effect transistor, the 2nd LED branches include the 2nd LED and
Second semiconductcor field effect transistor, the input terminal of the first LED and the first end of equivalent output capacitance connect, the output of the first LED
End is connect with the first end of the first semiconductcor field effect transistor, the second end of the first semiconductcor field effect transistor and equivalent output electricity
The second end of appearance connects, and the third end of the first semiconductcor field effect transistor inputs the first pulse width modulation (PWM) signal；Second
The first end of the input terminal of LED and equivalent output capacitance connects, the output end of the 2nd LED and the second semiconductcor field effect transistor
First end connects, and the second end of the second semiconductcor field effect transistor and the second end of equivalent output capacitance connect, the second semiconductor
The third end of field-effect transistor and the output end of error amplifying circuit connect, and first input end and the sampling of error amplifying circuit are protected
Hold circuit connection, the second input terminal input reference electric current of error amplifying circuit.
Sampling hold circuit is for acquiring predetermined current and predetermined current being input to error amplifying circuit；Error is amplified
Circuit is used to export the second pwm signal according to predetermined current, to control the second semiconductcor field effect transistor by the second pwm signal
Compensate the voltage of the 2nd LED branches.
Optionally, which can also include that third switchs；The first end of third switch
It is connect with error amplifying circuit, the second end of third switch is connect with the third end of the second semiconductcor field effect transistor.
It is exemplary, when compensating the voltage of the 2nd LED branches by the second semiconductcor field effect transistor, the first semiconductcor field
Effect transistor can also be controlled by the first pulse width modulation (PWM) signal, the second pwm signal of error amplifying circuit output end
The second semiconductcor field effect transistor is controlled by third switch, when the second pwm signal of error amplifying circuit output end
For high current signal when, third switch conduction, when the second pwm signal of error amplifying circuit output end be low current signal when,
Third switch disconnects, to compensate the voltage of the 2nd LED branches by the second semiconductcor field effect transistor.
It should be noted that in the utility model embodiment, it is by semiconductcor field effect transistor of boost pressure circuit only
Example illustrates, and certainly, boost pressure circuit may be triode, can specifically be configured according to actual needs.
Further, predetermined current is being acquired by sampling hold circuit and predetermined current is input to error amplification electricity
Road；Error amplifying circuit exports the second pwm signal according to predetermined current, to control the second semiconductcor field by the second pwm signal
When imitating the voltage of transistor the 2nd LED branches of compensation, which can be the peak point current of the second LED branches, can also
For the average current of the first LED branches or the average current of the 2nd LED branches, corresponding first LED branches further include first opening
It closes, the 2nd LED branches further include second switch, shown in Figure 5, and Fig. 5 is another that the utility model embodiment provides
The structural schematic diagram of multichannel Light-emitting diode LED driving circuit.
The first end of first switch is connect with the second end of the first semiconductcor field effect transistor, the second end of first switch with
The second end of equivalent output capacitance connects.
The second end of second switch is connect with the second end of the second semiconductcor field effect transistor, the second end of second switch with
The second end of equivalent output capacitance connects.
In the first possible implementation, it when the predetermined current can be the peak point current of the second LED branches, asks
Shown in Figure 6, Fig. 6 is the structure for another multichannel Light-emitting diode LED driving circuit that the utility model embodiment provides
Schematic diagram.The control pole of first semiconductcor field effect transistor is set into height, it is made to be operated in switch region, the of the first LED branches
Two boost pressure circuits do not work, and the control pole of the second semiconductcor field effect transistor is controlled by the second pwm signal, are operated in linear
Area, the electric current of the 2nd LED by sampling hold circuit (exemplary, can be peak value sampling retainer) together with reference current into
Enter error amplifying circuit to be compared, to compensate the voltage of the 2nd LED branches by the second semiconductcor field effect transistor so that
The voltage of the voltage and the first LED branches of 2nd LED branches is equal or approximately equal, so that in the first LED branches and
When being switched between two LED branches, avoid that electric current is excessive or electric current rises slow phenomenon, pressure drop is larger not influencing
While LED branch power consumptions, the normal work of the smaller LED branches of pressure drop is realized, to improve the driving effect of LED multi-path
Fruit.Wherein, the value of the reference current can be the value of relationship proportional to single-level circuit output current.
In second of possible realization method, when the predetermined current can be the average current or the of the first LED branches
Shown in Figure 7 when the average current of two LED branches, Fig. 7 is that another multichannel that the utility model embodiment provides shines
The structural schematic diagram of diode (LED) driving circuit.The control pole of first semiconductcor field effect transistor is set into height, it is made to be operated in out
Region is closed, the second boost pressure circuit of the first LED branches does not work, and the control pole of the second semiconductcor field effect transistor is by the 2nd PWM
The control of signal, is operated in linear zone, can be obtained by sampling hold circuit (exemplary, can be average value sampling holder)
To the average current value of the average current value and the 2nd LED branches of the first LED branches, and putting down any of which LED branches
Equal electric current error originated from input amplifying circuit together with reference current is compared, to be compensated by the second semiconductcor field effect transistor
The voltage of 2nd LED branches so that the voltage of the voltage and the first LED branches of the 2nd LED branches is equal or approximately equal, to
When so that being switched between the first LED branches and the 2nd LED branches, avoid that electric current is excessive or electric current rise it is slowly existing
As while not influencing pressure drop larger LED branches power consumption, the normal work of the smaller LED branches of pressure drop being realized, to improve
The driving effect of LED multi-path.Wherein, the value of the reference current can be relationship proportional to single-level circuit output current
Value.
After by above embodiment described multichannel Light-emitting diode LED driving circuit, it is possible to further describe
The multichannel Light-emitting diode LED driving circuit method, shown in Figure 8, Fig. 8 is one kind that the utility model embodiment provides
The schematic diagram of multichannel Light-emitting diode LED driving method, the multichannel Light-emitting diode LED driving method may include：
S101, when the voltage of the first LED branches is more than the voltage of the 2nd LED branches, pass through the in the 2nd LED branches
One boost pressure circuit compensates the voltage of the 2nd LED branches, so that the voltage of the voltage of the 2nd LED branches and the first LED branches meets
Predetermined threshold value.
Optionally, before the voltage that the 2nd LED branches are compensated by boost pressure circuit, further include：
S100, determine that the voltage of the first LED branches is more than the voltage of the 2nd LED branches.
It should be noted that in the utility model embodiment, presets and determine that the voltage of the first LED branches is more than second
The voltage of LED branches can be realized by following two possible modes：
Optionally, in the first possible implementation, the first LED branches include the first LED, the 2nd LED branch packets
The 2nd LED is included, then S100 determines that the voltage of the first LED branches is more than the voltage of the 2nd LED branches, may include：
It is connected in the first LED branches, and when the disconnection of the 2nd LED branches, detects the electric current of the first LED.
It is connected in the 2nd LED branches, and when the disconnection of the first LED branches, detects the electric current of the 2nd LED.
If the electric current of the first LED is less than the electric current of the 2nd LED, it is determined that the voltage of the first LED branches is more than the 2nd LED branch
The voltage on road.
Optionally, in second of possible realization method, the first LED branches further include the second boost pressure circuit, then S100
It determines that the voltage of the first LED branches is more than the voltage of the 2nd LED branches, may include：
Within a preset period of time, the first LED branches and the conducting of the 2nd LED branches, obtain the first LED in preset time period
The electric current or the voltage at the first boost pressure circuit of voltage and the 2nd LED at electric current or the second boost pressure circuit.
If electric current of the electric current of the first LED less than the 2nd LED or the voltage at the second boost pressure circuit are less than the first supercharging electricity
Voltage at road, it is determined that the voltage of the first LED branches is more than the voltage of the 2nd LED branches.
Optionally, the voltage of the 2nd LED branches is compensated by the first boost pressure circuit in the 2nd LED branches, including：
When the 2nd LED branches are connected, the peak point current of the 2nd LED branches is detected；According to the peak value of the 2nd LED branches electricity
Stream and reference current control the voltage that the first boost pressure circuit compensates the 2nd LED branches.
Or；
It is connected in the first LED branches, and in the period of the 2nd LED branches disconnection, obtains the average electricity of the first LED branches
Stream；It is connected in the 2nd LED branches, and in the period of the first LED branches disconnection, obtains the average current of the 2nd LED branches；Root
According to the average current and reference current of the first LED branches, or according to the average current and reference current of the 2nd LED branches control the
One boost pressure circuit compensates the voltage of the 2nd LED branches.
Above-mentioned multichannel Light-emitting diode LED driving method is accordingly applicable to the multichannel light-emitting diodes of any embodiment
The technical solution of pipe LED drive circuit, implementing principle and technical effect are similar, and details are not described herein.
Finally it should be noted that：The above various embodiments is only to illustrate the technical solution of the utility model, rather than limits it
System；Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should
Understand：It still can be with technical scheme described in the above embodiments is modified, either to which part or whole
Technical characteristic carries out equivalent replacement；And these modifications or replacements, this practicality that it does not separate the essence of the corresponding technical solution are new
The range of each embodiment technical solution of type.
Claims (5)
1. a kind of multichannel Light-emitting diode LED driving circuit, which is characterized in that including：
Constant voltage source, drive sub-circuits, equivalent output capacitance, the first LED branches and the 2nd LED branches, the first LED branches
Voltage be more than the voltage of the 2nd LED branches, and the 2nd LED branches include the first boost pressure circuit；
The first end and second end of the constant voltage source is connect with the first end and second end of the drive sub-circuits respectively, described
The third end of drive sub-circuits respectively with the first end of the equivalent output capacitance, the first end of the first LED branches and institute
State the first end connection of the 2nd LED branches；4th end of the drive sub-circuits respectively with the equivalent output capacitance second
The second end connection at end, the second end of the first LED branches and the 2nd LED branches；
First boost pressure circuit is used to compensate the voltage of the 2nd LED branches so that the voltage of the 2nd LED branches with
The voltage of the first LED branches meets predetermined threshold value.
2. circuit according to claim 1, which is characterized in that
The first LED branches also include the second boost pressure circuit, and second boost pressure circuit does not work.
3. circuit according to claim 2, which is characterized in that boost pressure circuit is semiconductcor field effect transistor, and the LED drives
Dynamic circuit further includes sampling hold circuit and error amplifying circuit；
The first LED branches include the first LED and the first semiconductcor field effect transistor, and the 2nd LED branches include second
The input terminal of LED and the second semiconductcor field effect transistor, the first LED is connect with the first end of the equivalent output capacitance,
The output end of first LED is connect with the first end of first semiconductcor field effect transistor, first semiconductcor field effect
The second end of transistor is connect with the second end of the equivalent output capacitance, the third end of first semiconductcor field effect transistor
Input the first pulse width modulation (PWM) signal；The input terminal of 2nd LED connects with the first end of the equivalent output capacitance
It connects, the output end of the 2nd LED is connect with the first end of second semiconductcor field effect transistor, second semiconductcor field
The second end of effect transistor is connect with the second end of the equivalent output capacitance, the third of second semiconductcor field effect transistor
End is connect with the output end of the error amplifying circuit, and the first input end of the error amplifying circuit keeps electricity with the sampling
Road connects, the second input terminal input reference voltage or reference current of the error amplifying circuit；
The sampling hold circuit is for acquiring predetermined current and the predetermined current being input to the error amplifying circuit；
The error amplifying circuit is used to export the second pwm signal according to predetermined current, with by described in second pwm signal control
Second semiconductcor field effect transistor compensates the voltage of the 2nd LED branches.
4. circuit according to claim 3, which is characterized in that the first LED branches further include first switch, and described
Two LED branches further include second switch；
The first end of the first switch is connect with the second end of first semiconductcor field effect transistor, the first switch
Second end is connect with the second end of the equivalent output capacitance；
The second end of the second switch is connect with the second end of second semiconductcor field effect transistor, the second switch
Second end is connect with the second end of the equivalent output capacitance.
5. circuit according to claim 3 or 4, which is characterized in that further include third switch；
The first end of the third switch is connect with the error amplifying circuit, the second end and described second of the third switch
The third end of semiconductcor field effect transistor connects.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721864522.1U CN207884930U (en) | 2017-12-27 | 2017-12-27 | Multichannel Light-emitting diode LED driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721864522.1U CN207884930U (en) | 2017-12-27 | 2017-12-27 | Multichannel Light-emitting diode LED driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108055728A (en) * | 2017-12-27 | 2018-05-18 | 生迪智慧科技有限公司 | Multichannel Light-emitting diode LED driving circuit and driving method |
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2017
- 2017-12-27 CN CN201721864522.1U patent/CN207884930U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108055728A (en) * | 2017-12-27 | 2018-05-18 | 生迪智慧科技有限公司 | Multichannel Light-emitting diode LED driving circuit and driving method |
| CN108055728B (en) * | 2017-12-27 | 2024-04-09 | 生迪智慧科技有限公司 | Multi-path light-emitting diode (LED) driving circuit and driving method |
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