CN109922557A - A kind of multipath LED constant current drive circuit, driving device and electrical equipment - Google Patents
A kind of multipath LED constant current drive circuit, driving device and electrical equipment Download PDFInfo
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- CN109922557A CN109922557A CN201711328117.2A CN201711328117A CN109922557A CN 109922557 A CN109922557 A CN 109922557A CN 201711328117 A CN201711328117 A CN 201711328117A CN 109922557 A CN109922557 A CN 109922557A
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Abstract
The invention discloses a kind of multipath LED constant current drive circuit, driving device and electrical equipment, the multipath LED constant current drive circuit includes sampling module, feedback control module, switch module and voltage regulator module；The sampling module exports sampled voltage to feedback control module for sampling to the electric current of LED light string；The feedback control module is used to generate voltage feedback signal according to sampled voltage and predetermined reference voltage to voltage regulator module and output drive signal to switch module；The switch module is used for opening or closing according to each paths of LEDs lamp string of driving signal independent control；The voltage regulator module is used to adjust the supply voltage of LED light string according to voltage feedback signal, makes driving current constant.Guarantee that each paths of LEDs lamp string electric current is constant by sampling adjustment supply voltage automatically, and each paths of LEDs lamp string works independently, and is not influenced by other LED light strings, and LED constant current drive system is effectively simplified, and avoids influencing each other between each paths of LEDs lamp string, constant current drives effect good.
Description
Technical field
The present invention relates to field of LED drive technology, in particular to a kind of multipath LED constant current drive circuit, driving device and
Electrical equipment.
Background technique
Currently, LED light source has been widely used in non-active light-emitting display device as back lighting.And it is shone as backlight
It is bright, need high-precision constant current driving to meet the brightness of display device, the requirement of coloration and uniformity, the at present constant current of mainstream
Driving is all made of special constant current driving IC, and input voltage is direct current, and input voltage range can be larger, output constant current, but is needed
Increase special boost module, lead to driving circuit increased costs, and a certain lamp string all lamp strings of opening a way can all be protected.
Or be also successfully applied in the constant current driving of LED backlight using the circuit of LLC topological realization constant current driving, this
Although kind of mode topology is simple, driving transformer is needed, cost is equally without clear superiority, and current ripples are larger, certain lamp string
All lamp strings also all can automatic protection when open circuit.
Thus the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of multipath LED constant current driving electricity
Road, driving device and electrical equipment guarantee that each paths of LEDs lamp string electric current is constant by sampling adjustment supply voltage automatically, and each road
LED light string works independently, and is not influenced by other LED light strings, is effectively simplified LED constant current drive system, has saved the manufacturing
Cost, and influencing each other between each paths of LEDs lamp string is avoided, constant current drives effect good.
In order to achieve the above object, this invention takes following technical schemes:
A kind of multipath LED constant current drive circuit is connect with the LED light string of several parallel connections comprising sampling module, feedback control mould
Block, switch module and voltage regulator module；The sampling module exports sampling for sampling to the electric current of LED light string
Voltage is to feedback control module；The feedback control module is used to generate voltage according to the sampled voltage and predetermined reference voltage
Feedback signal is to voltage regulator module and output drive signal to switch module；The switch module is used for according to the drive
Dynamic each paths of LEDs lamp string of signal independent control opens or closes；The voltage regulator module is used to be believed according to the Voltage Feedback
Number adjust LED light string supply voltage, make driving current constant.
In the multipath LED constant current drive circuit, the sampling module includes that several are corresponding with LED light string quantity
Sampling unit, the sampling unit is used to carry out independent sample to the electric current of corresponding LED light string, and exports corresponding sampled voltage
To feedback control module.
In the multipath LED constant current drive circuit, the feedback control module is specifically used for each paths of LEDs lamp string
The sampled voltage of stream calculates according to comparison result and preset algorithm compared with predetermined reference voltage and exports each paths of LEDs lamp
The adjusting voltage of string calculates the average value for adjusting voltage to generate voltage feedback signal to voltage regulator module.
In the multipath LED constant current drive circuit, the preset algorithm is by the sampling electricity of each paths of LEDs lamp string electric current
Pressure exports the adjusting voltage of each paths of LEDs lamp string multiplied by predetermined coefficient.
In the multipath LED constant current drive circuit, the feedback control module is also used to obtain in the adjusting voltage
Maximum value and minimum value, it is electric to judge whether the maximum value in the adjusting voltage is greater than the first preset threshold and adjustings
Minimum value in pressure exports the driving signal of each paths of LEDs lamp string to opening whether less than the second preset threshold, according to judging result
Close module.
In the multipath LED constant current drive circuit, the switch module includes that several are corresponding with LED light string quantity
Switch unit, the switch unit are used to control LED light string connected to it according to the driving signal of each paths of LEDs lamp string is corresponding
Open or close.
In the multipath LED constant current drive circuit, the voltage regulator module include rectification filtering unit, transformer,
Control unit and voltage feedback unit；The rectification filtering unit is used to AC-input voltage being converted to DC voltage；It is described
Transformer is used to be converted to DC voltage the supply voltage of LED light string；Described control unit carries out electricity for driving transformer
Pressure conversion；The voltage feedback unit is exported according to the voltage feedback signal and is adjusted for receiving the voltage feedback signal
Signal is saved to control unit, adjusts the supply voltage of transformer output.
In the multipath LED constant current drive circuit, the voltage feedback unit is specifically used for when the adjusting voltage
When average value is greater than predetermined reference voltage, the adjustment signal of output supply voltage reduction；When the average value for adjusting voltage is small
When predetermined reference voltage, the adjustment signal that output supply voltage increases is preset until the average value for adjusting voltage is equal to
Reference voltage.
A kind of multipath LED constant current driving device, including shell are provided with pcb board in the shell, set on the pcb board
It is equipped with multipath LED constant current drive circuit as described above.
A kind of electrical equipment, the LED light string including several parallel connections, which is characterized in that permanent using LED multi-path as described above
It flows driving device and drives the LED light string.
Compared to the prior art, in multipath LED constant current drive circuit provided by the invention, driving device and electrical equipment,
The multipath LED constant current drive circuit is connect with the LED light string of several parallel connections comprising sampling module, is opened feedback control module
Close module and voltage regulator module；The sampling module exports sampled voltage extremely for sampling to the electric current of LED light string
Feedback control module；The feedback control module is used to generate Voltage Feedback letter according to the sampled voltage and predetermined reference voltage
Number to voltage regulator module and output drive signal to switch module；The switch module is used for according to the driving signal
Each paths of LEDs lamp string of independent control opens or closes；The voltage regulator module is used to be adjusted according to the voltage feedback signal
The supply voltage of LED light string, makes driving current constant.Guarantee each paths of LEDs lamp string electric current by sampling adjustment supply voltage automatically
It is constant, and each paths of LEDs lamp string works independently, and is not influenced by other LED light strings, is effectively simplified LED constant current drive system, saves
Manufacturing cost, and avoid influencing each other between each paths of LEDs lamp string, constant current drives effect good.
Detailed description of the invention
Fig. 1 is the structural block diagram of multipath LED constant current drive circuit provided by the invention.
Fig. 2 is the schematic diagram of multipath LED constant current drive circuit provided by the invention.
Specific embodiment
The present invention provides a kind of multipath LED constant current drive circuit, driving device and electrical equipment, by sampling adjustment automatically
Supply voltage guarantees that each paths of LEDs lamp string electric current is constant, and each paths of LEDs lamp string works independently, and is not influenced, is had by other LED light strings
Effect simplifies LED constant current drive system, has saved manufacturing cost, and avoid influencing each other between each paths of LEDs lamp string,
Constant current drives effect good.
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to
Limit the present invention.
Referring to Fig. 1, multipath LED constant current drive circuit provided by the invention is connect with the LED light string of several parallel connections, packet
Sampling module 10, feedback control module 20, switch module 30 and voltage regulator module 40 are included, the switch module 30 connects each road
LED light string, sampling module 10 and feedback control module 20, the feedback control module 20 adjust mould with sampling module 10 and voltage
Block 40 connects, and the voltage regulator module 40 is connect with each paths of LEDs lamp string.Wherein, the sampling module 10 is used for LED light string
Electric current sampled, and export sampled voltage to feedback control module 20；The feedback control module 20 is used for according to
Sampled voltage and predetermined reference voltage generate voltage feedback signal to voltage regulator module 40 and output drive signal and extremely switch
Module 30；The switch module 30 is used for opening or closing according to each paths of LEDs lamp string of driving signal independent control；It is described
Voltage regulator module 40 is used to adjust the supply voltage of LED light string according to the voltage feedback signal, makes driving current constant.
Specifically, the present invention samples the electric current of LED light string by the sampling module 10, later output sampling
Voltage to feedback control module 20, the feedback control module 20 generates electricity according to the sampled voltage and predetermined reference voltage
Press feedback signal to voltage regulator module 40, wherein the predetermined reference voltage is to be pre-stored in feedback control module 20
Voltage value, user can be adjusted according to practical driving demand, will after voltage regulator module 40 receives the voltage feedback signal
Adjust the output to the supply voltage of LED light string in real time according to the voltage feedback signal, so that the electric current of LED light string is constant, from
And the adaptive adjustment of supply voltage is realized by voltage sample, and then realize constant current driving, without special boosting mould
Block, circuit structure are simple.Also, in the present invention, the feedback control module 20 is also according to the sampled voltage and preset reference
Voltage output driving signal is to switch module 30, by switch module 30 according to each paths of LEDs lamp string of the driving signal independent control
Open or close so that each independent constant current operation of paths of LEDs lamp string, a certain LED light string operation irregularity do not lead to whole lamp strings
Power-off protection eliminates influencing each other between each paths of LEDs lamp string, improves the effect of constant current driving.It is described in the present embodiment
Feedback control module 20 is using the control chip of model AS3695, and certainly, can also be used other has in other embodiments
The feedback control chip of identical function, this is not limited by the present invention.
Further, referring to Figure 2 together, the sampling module 10 includes that several corresponding with LED light string quantity are adopted
Sample unit 101, the sampling unit 101 is used to carry out the electric current of corresponding LED light string independent sample, and exports corresponding sampling
Voltage is to feedback control module 20.As shown in Fig. 2, the LED light string of several parallel connections include LED light string 1, LED light string 2 ..., LED
The total n lamp string of lamp string n, then it includes n sampling unit 101 that the sampling module 10 is corresponding, corresponding by each sampling unit 101
The electric current of a LED light string is sampled, and exports corresponding sample voltage value feedback control module 20, i.e., is connect with LED light string 1
The sampled voltage Vfb1 of the output LED light string 1 of sampling unit 101 is to feedback control module 20, the sampling list connecting with LED light string 2
Member 101 exports the sampled voltage Vfb2 of LED light string 2 to feedback control module 20, and so on, the sampling being connect with LED light string n
Unit 101 exports the sampled voltage Vfbn of LED light string n to feedback control module 20, to get adopting for each paths of LEDs lamp string
Sample voltage is powered voltage adaptive adjustment so as to subsequent, and can get the working condition of each paths of LEDs lamp string, has
Conducive to independent control adjustment.
Specifically, the feedback control module 20 is used for the sampled voltage and preset reference of each paths of LEDs lamp string electric current
Voltage compares, and the adjusting voltage for exporting each paths of LEDs lamp string is calculated according to comparison result and preset algorithm, calculates institute later
The average value for adjusting voltage is stated to generate voltage feedback signal to voltage regulator module 40.In the present embodiment, when each sampling
After unit 101 has fed back the sampled voltage to feedback control module 20 of each paths of LEDs lamp string electric current, feedback control module 20 will be every
The sampled voltage of LED light string electric current is compared with predetermined reference voltage all the way, and is calculated according to preset algorithm and generate each paths of LEDs lamp
The adjusting voltage of string, specifically, after feedback control module 20 receives the sampled voltage Vfb1 of LED light string 1, by Vfb1 and in advance
If reference voltage Vref is compared, Vfb1 is obtained multiplied by a predetermined coefficient k by the adjusting of LED light string 1 according to comparison result
Voltage Vfb1 ', and so on, after feedback control module 20 receives the sampled voltage Vfbn of LED light string n, by Vfbn and preset
Reference voltage Vref is compared, and Vfbn is obtained to the adjusting electricity of LED light string n according to comparison result multiplied by a predetermined coefficient k
Vfbn ' is pressed, calculates the average value Vavg for adjusting voltage=(Vfb1 '+Vfb2 '+...+Vfbn ')/n later to get to electricity
Press feedback signal Vfb.Take the average value of the adjusting voltage of all LED light strings as voltage feedback signal, it can general equilibrium reaction
The working condition of current all LED light strings is conducive to subsequent voltage adaptive adjustment.
Preferably, heretofore described feedback control module 20 is also used to obtain the maximum value and most in the adjusting voltage
Small value, judges whether the maximum value in the adjusting voltage is greater than the first preset threshold and the minimum value adjusted in voltage
Whether less than the second preset threshold, the driving signal of each paths of LEDs lamp string is exported to switch module 30 according to judging result.Exist
After the adjusting voltage for obtaining all LED light strings, all maximum value Vmax and minimum value Vmin adjusted in voltage are obtained, are sentenced
Whether disconnected maximum value Vmax is greater than the first preset threshold, i.e. upper voltage limit, if more than then illustrate supply voltage it is excessively high or certain
One lamp string operation irregularity judges that minimum value Vmin whether less than the second preset threshold, i.e. voltage lower limit value, illustrates to supply if being less than
Piezoelectric voltage is too low or a certain lamp string operation irregularity, exports the driving signal of each paths of LEDs lamp string to switching according to judging result
Module 30.
For example, being said if only having a maximum value and the maximum value in all adjusting voltage is greater than the first preset threshold
The corresponding LED light string operation irregularity of the bright maximum value, controls that the LED light string is closed and other LED light strings are normally-open, to this
LED light string progress is separately protected, the work of other LED light strings is not influenced, if there are multiple equal in all adjusting voltage
Maximum value and it is all larger than the first preset threshold, illustrates that supply voltage is excessively high at this time, all LED light strings can control to be turned off, it is real
The now protection of all lamp strings improves the safety of drive control, and the estimate of situation of minimum value is similar with maximum value, therefore according to sentencing
Disconnected result exports the driving signal of each paths of LEDs lamp string to switch module 30, is driven by switch module 30 to each paths of LEDs lamp string
Dynamic control, it can be achieved that each paths of LEDs lamp string it is separately protected, optimize constant current driving protecting effect.
Preferably, the switch module 30 includes several switch units 301 corresponding with LED light string quantity, described to open
Unit 301 is closed to be used for according to the corresponding unlatching for controlling LED light string connected to it of the driving signal of each paths of LEDs lamp string or pass
It closes.It is similar with sampling module 10, the switch module 30 equally include several switch units 301, respectively with each paths of LEDs lamp string
And feedback control module 20 connects, feedback control module 20 will export corresponding drive after obtaining judging result according to adjusting voltage
Signal is moved to each switch unit 301, as shown in Fig. 2, feedback control module 20 exports the driving signal of LED light string 1 respectively
Vdrv1, LED light string 2 driving signal Vdrv2 ..., the driving signal Vdrvn of LED light string n to corresponding switch unit 301,
It controls the working condition of each switch unit 301 and then controls opening or closing for every paths of LEDs lamp string, enable each paths of LEDs lamp string
It works independently, does not influence between each other, driving method is more bonded user demand.
Further, please continue to refer to Fig. 2, the voltage regulator module 40 includes rectification filtering unit 401, transformer
402, control unit 403 and voltage feedback unit 404, the voltage feedback unit 404 connect feedback control module 20, control list
Member 403 and rectification filtering unit 401, described control unit 403, transformer 402 and rectification filtering unit 401 are sequentially connected, institute
It states rectification filtering unit 401 and is also connected with feedback control module 20 and each paths of LEDs lamp string, respectively feedback control module 20 provides work
Make voltage, and provides supply voltage for each paths of LEDs lamp string.Wherein, the rectification filtering unit 401 will be for that will exchange input electricity
Pressure is converted to DC voltage；The transformer 402 is used to be converted to DC voltage the supply voltage of LED light string；The control
Unit 403 carries out voltage conversion for driving transformer 402；The voltage feedback unit 404 is for receiving the Voltage Feedback
Signal, and according to the voltage feedback signal output regulation signal to control unit 403, adjust the power supply that transformer 402 exports
Voltage.
I.e. the present invention realizes DC-DC conversion by 403 driving transformer 402 of control unit, and AC-input voltage is rectified
DC voltage after conversion is converted to the supply voltage of LED light string, and receives feedback control module by voltage feedback unit 404
The voltage feedback signal of 20 outputs, later according to the voltage feedback signal output regulation signal to control unit 403, by controlling
Unit 403 adjusts the DC-DC conversion of transformer 402, and then adjusts the supply voltage that transformer 402 exports, and realizes supply voltage
Adjusting.In the present embodiment, PWM controller or LLC controller is can be used in described control unit 403, and the present invention does not make this
It limits.
Preferably, the voltage feedback unit 404 is specifically used for being greater than preset reference when the average value for adjusting voltage
When voltage, the adjustment signal of output supply voltage reduction；It is defeated when the average value for adjusting voltage is less than predetermined reference voltage
The adjustment signal that supply voltage increases out, until the average value for adjusting voltage is equal to predetermined reference voltage.It is i.e. electric when adjusting
When the average value Varg of pressure is greater than predetermined reference voltage Vref, illustrate that supply voltage VLED is larger at this time, therefore exports power supply electricity
Reduced adjustment signal is pressed, the average value Varg until adjusting voltage is equal to predetermined reference voltage Vref, and when adjusting voltage
When average value Varg is less than predetermined reference voltage Vref, illustrate that supply voltage VLED is smaller at this time, therefore exports supply voltage and increase
Big adjustment signal, the average value Varg until adjusting voltage are equal to predetermined reference voltage Vref, realize supply voltage VLED's
Adaptive adjustment, guarantees the electric current of each paths of LEDs lamp string in scope of design, realizes the constant current driving of low cost.
Based on above-mentioned multipath LED constant current drive circuit, the present invention correspondingly provides a kind of multipath LED constant current driving device,
Including shell, it is provided with pcb board in the shell, multipath LED constant current driving electricity as described above is provided on the pcb board
Road is not described further herein since the multipath LED constant current drive circuit being described in detail above.
The present invention correspondingly provides a kind of electrical equipment, the LED light string including several parallel connections, uses as described above more
Paths of LEDs constant current driving device drives the LED light string, due to having carried out in detail to the multipath LED constant current driving device above
It is thin to introduce, it is not described further herein.
In conclusion in multipath LED constant current drive circuit provided by the invention, driving device and electrical equipment, it is described more
LED constant-current drive circuits are connect with the LED light string of several parallel connections comprising sampling module, feedback control module, switch module
And voltage regulator module；The sampling module exports sampled voltage to feeding back control for sampling to the electric current of LED light string
Molding block；The feedback control module is used to generate voltage feedback signal to electricity according to the sampled voltage and predetermined reference voltage
Press adjustment module and output drive signal to switch module；The switch module according to the driving signal for independently controlling
Make opening or closing for each paths of LEDs lamp string；The voltage regulator module is used to adjust LED light string according to the voltage feedback signal
Supply voltage, make driving current constant.Guarantee that each paths of LEDs lamp string electric current is constant by sampling adjustment supply voltage automatically, and
Each paths of LEDs lamp string works independently, and is not influenced by other LED light strings, is effectively simplified LED constant current drive system, has saved production
Manufacturing cost, and influencing each other between each paths of LEDs lamp string is avoided, constant current drives effect good.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of multipath LED constant current drive circuit is connect with the LED light string of several parallel connections, which is characterized in that including sampling mould
Block, feedback control module, switch module and voltage regulator module；The sampling module is for adopting the electric current of LED light string
Sample, and sampled voltage is exported to feedback control module；The feedback control module is used for according to the sampled voltage and default ginseng
It examines voltage and generates voltage feedback signal to voltage regulator module and output drive signal to switch module；The switch module
For opening or closing according to each paths of LEDs lamp string of driving signal independent control；The voltage regulator module is used for basis
The voltage feedback signal adjusts the supply voltage of LED light string, makes driving current constant.
2. multipath LED constant current drive circuit according to claim 1, which is characterized in that the sampling module includes several
A sampling unit corresponding with LED light string quantity, the sampling unit are used to independently adopt the electric current progress of corresponding LED light string
Sample, and corresponding sampled voltage is exported to feedback control module.
3. multipath LED constant current drive circuit according to claim 2, which is characterized in that the feedback control module is specific
For by the sampled voltage of each paths of LEDs lamp string electric current compared with predetermined reference voltage, and according to comparison result and pre- imputation
Method calculates the adjusting voltage for exporting each paths of LEDs lamp string, calculates the average value for adjusting voltage to generate Voltage Feedback letter
Number to voltage regulator module.
4. multipath LED constant current drive circuit according to claim 2, which is characterized in that the preset algorithm is will be each
The sampled voltage of paths of LEDs lamp string electric current exports the adjusting voltage of each paths of LEDs lamp string multiplied by predetermined coefficient.
5. multipath LED constant current drive circuit according to claim 3, which is characterized in that the feedback control module is also used
In obtaining the maximum value and minimum value adjusted in voltage, it is pre- to judge whether the maximum value in the adjusting voltage is greater than first
If whether threshold value and the minimum value adjusted in voltage are less than the second preset threshold, according to judging result output per all the way
The driving signal of LED light string is to switch module.
6. multipath LED constant current drive circuit according to claim 5, which is characterized in that the switch module includes several
A switch unit corresponding with LED light string quantity, the switch unit are used for corresponding according to the driving signal of each paths of LEDs lamp string
Control opening or closing for LED light string connected to it.
7. multipath LED constant current drive circuit according to claim 3, which is characterized in that the voltage regulator module includes
Rectification filtering unit, transformer, control unit and voltage feedback unit；The rectification filtering unit is used for AC-input voltage
Be converted to DC voltage；The transformer is used to be converted to DC voltage the supply voltage of LED light string；Described control unit is used
Voltage conversion is carried out in driving transformer；The voltage feedback unit is used to receive the voltage feedback signal, and according to described
Voltage feedback signal output regulation signal adjusts the supply voltage of transformer output to control unit.
8. multipath LED constant current drive circuit according to claim 7, which is characterized in that the voltage feedback unit is specific
For the adjustment signal that when the average value for adjusting voltage is greater than predetermined reference voltage, output supply voltage reduces；Work as institute
When stating the average value for adjusting voltage less than predetermined reference voltage, the adjustment signal that output supply voltage increases, until the adjusting
The average value of voltage is equal to predetermined reference voltage.
9. a kind of multipath LED constant current driving device, including shell, pcb board is provided in the shell, which is characterized in that described
It is arranged on pcb board just like multipath LED constant current drive circuit described in claim 1-8 any one.
10. a kind of electrical equipment, the LED light string including several parallel connections, which is characterized in that using as claimed in claim 9 more
Paths of LEDs constant current driving device drives the LED light string.
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| CN201711328117.2A CN109922557A (en) | 2017-12-13 | 2017-12-13 | A kind of multipath LED constant current drive circuit, driving device and electrical equipment |
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| CN110198581A (en) * | 2019-04-24 | 2019-09-03 | 北京中电华大电子设计有限责任公司 | A kind of current driver of high efficiency multichannel |
| CN112383986A (en) * | 2020-08-26 | 2021-02-19 | 马瑞利汽车零部件(芜湖)有限公司 | Electronic control unit system for driving multiple light sources |
| CN114170977A (en) * | 2021-12-15 | 2022-03-11 | 北京芯格诺微电子有限公司 | LED backlight matrix driving circuit and driving voltage detection and adjustment method thereof |
| CN114401567A (en) * | 2020-10-09 | 2022-04-26 | 京东方科技集团股份有限公司 | Control method of drive circuit, drive circuit and light-emitting substrate |
| WO2023216602A1 (en) * | 2022-05-09 | 2023-11-16 | 惠科股份有限公司 | Control circuit, control method and display apparatus |
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Application publication date: 20190621 |
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