CN110234188A - The self shifter of LED drive chip adjusts circuit - Google Patents
The self shifter of LED drive chip adjusts circuit Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Abstract
The self shifter of LED drive chip provided by the invention adjusts circuit, including dual comparator sub-circuit, logic subcircuit and self shifter drive metal-oxide-semiconductor sub-circuit；Wherein, the grid of metal-oxide-semiconductor is driven in the input terminal connection self shifter driving metal-oxide-semiconductor sub-circuit of the dual comparator sub-circuit, the output end of the dual comparator sub-circuit connects the input terminal of the logic subcircuit, and the output of the logic subcircuit terminates the self shifter and drives metal-oxide-semiconductor sub-circuit.The circuit improves the consistency of output electric current in very wide LED output current scope.
Description
Technical field
The invention belongs to electronic circuit technology fields, and in particular to the self shifter of LED drive chip adjusts circuit.
Background technique
In existing LED display driver IC technology, there is plurality of LEDs driving chip in usual one piece of LED driving mould group,
A LED driving chip has multiple channels for driving plurality of LEDs lamp bead simultaneously.It is determined by the size of current of LED lamp bead
The bright dark degree of LED lamp bead reaches expected display effect by presetting the driving current of LED drive chip.
For LED display, in order to reach display effect measured to the greatest extent, different chip chambers in same mould group are usually required that
The different interchannel current errors of current error and same chips require small as far as possible.Moreover, for unlike material
LED lamp bead (such as red light, green light, blue lamp), in order to reach ideal display effect, there is also larger differences for the driving current needed
It is different.In this way, it is desirable that LED drive chip, which can ensure to export in wide range of current output electric current, has preferable consistency.
In existing implementation, usually there are two types of implementations, and a kind of implementation is the driving of constant current output in chip
Metal-oxide-semiconductor designs the various sizes of driving MOS device of multiple groups, for different application systems (such as red light, green light, blue lamp), leads to
The different register value of software configuration is crossed to preset various sizes of driving metal-oxide-semiconductor.It, should for different LED display screen systems
Implementation needs to configure different software codes, portable poor.
Another mode of existing implementation is using a current-sensing circuit, and current-sensing circuit detection is flowed through
Drive metal-oxide-semiconductor size of current, compared with preset transfer point electric current, if input current compared with transfer point after meet switching
Condition then exports a switching signal and appropriate adjustment driving metal-oxide-semiconductors at different levels by current-sensing circuit.The shortcomings that technical solution is
The precision of current detecting is poor, and the burr of the immediate current variation of LED lamp bead light on and off is easy to cause the erroneous judgement of current comparison circuit
Disconnected, anti-interference is poor.
Summary of the invention
For the defects in the prior art, the present invention provides a kind of self shifter of LED drive chip to adjust circuit,
The consistency of output electric current is improved in very wide LED output current scope.
A kind of self shifter of LED drive chip adjusts circuit, including dual comparator sub-circuit, logic subcircuit and automatic
Shift driving metal-oxide-semiconductor sub-circuit；
Wherein, metal-oxide-semiconductor is driven in the input terminal connection self shifter driving metal-oxide-semiconductor sub-circuit of the dual comparator sub-circuit
Grid, the output end of the dual comparator sub-circuit connects the input terminal of the logic subcircuit, the logic subcircuit
Output terminates the self shifter and drives metal-oxide-semiconductor sub-circuit.
Preferably, the dual comparator sub-circuit includes first comparator and the second comparator；
Wherein, the input of first comparator terminates reference voltage cathode；The second ratio of reference voltage termination of first comparator
Compared with the reference voltage end of device, reference end is formed, described drive in metal-oxide-semiconductor sub-circuit with reference to the termination self shifter drives MOS
The grid of pipe；The output end of first comparator forms the first output end, connects the first input end of the logic subcircuit；
The input termination reference voltage anode of second comparator, the output end of the second comparator form second output terminal, connect
Second input terminal of the logic subcircuit.
Preferably, the logic subcircuit is digital circuit, including two input terminals and several output ends；
Described two input terminals include first input end and the second input terminal；
Preferably, the self shifter driving metal-oxide-semiconductor sub-circuit includes the first amplifier OP1, the second amplifier OP2, perseverance
Stream source l1, driving metal-oxide-semiconductor MB and diode (LED)；
The driving metal-oxide-semiconductor includes several group selection metal-oxide-semiconductors parallel with one another；Selecting metal-oxide-semiconductor includes the first metal-oxide-semiconductor and the
Two metal-oxide-semiconductors；The grid of first metal-oxide-semiconductor and the second metal-oxide-semiconductor is all connected with the stationary contact of an electronic switch, the dynamic touching of the first of electronic switch
Point ground connection, the second movable contact of electronic switch are connected to the output end of the first amplifier OP1；First metal-oxide-semiconductor and the second metal-oxide-semiconductor
Source grounding；The drain of first metal-oxide-semiconductor connects the electrode input end of the first amplifier OP1, and the drain of the second metal-oxide-semiconductor connects second and puts
The negative input of big device OP2；The grid of all first metal-oxide-semiconductors and the second metal-oxide-semiconductor is connected with each other, and connects the dual comparator
The input terminal of sub-circuit；
The output end of the logic subcircuit is connect with the control terminal of the electronic switch；
The electrode input end of first amplifier OP1 connects the electrode input end of the second amplifier OP2；First amplifier OP1
Negative input connect constant pressure source, the grid of the output termination metal-oxide-semiconductor MB of the second amplifier OP2, the source electrode of metal-oxide-semiconductor MB connects second
The drain of the negative input of amplifier OP2, metal-oxide-semiconductor MB connects the first amplification by successively reversal connection diode (LED), series connection constant-current source
The electrode input end of device OP1.
Preferably, each output end of the logic subcircuit is connected to the control of electronic switch in every group selection metal-oxide-semiconductor
End processed.
Preferably, the driving metal-oxide-semiconductor further includes one group of default metal-oxide-semiconductor；
Defaulting metal-oxide-semiconductor includes third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor；The grid of third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor is connected to
The output end of first amplifier OP1；The source grounding of third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor；The drain of third metal-oxide-semiconductor connects first
The electrode input end of amplifier OP1, the drain of the 4th metal-oxide-semiconductor connect the negative input of the second amplifier OP2；All 3rd MOS
The grid of pipe and the 4th metal-oxide-semiconductor is connected with each other, and connects the input terminal of the dual comparator sub-circuit.
Preferably, described to select metal-oxide-semiconductor for three groups.
The self shifter of LED drive chip provided in an embodiment of the present invention adjusts circuit, exports electric current model in very wide LED
The consistency of output electric current is improved in enclosing.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar element
Or part is generally identified by similar appended drawing reference.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is the module frame chart that self shifter provided in an embodiment of the present invention adjusts circuit.
Fig. 2 is a kind of circuit diagram of dual comparator sub-circuit provided in an embodiment of the present invention.
Fig. 3 is the circuit diagram that a kind of self shifter provided in an embodiment of the present invention drives metal-oxide-semiconductor sub-circuit.
Fig. 4 is a kind of state diagram of logic subcircuit provided in an embodiment of the present invention.
Fig. 5 is output current gain provided in an embodiment of the present invention and VG relation curve.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It is also understood that mesh of the term used in this description of the invention merely for the sake of description specific embodiment
And be not intended to limit the present invention.As description of the invention and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singular, "one" and "the" are intended to include plural form.
Embodiment:
A kind of self shifter adjusting circuit of LED drive chip, referring to Fig. 1, including dual comparator sub-circuit, logic son electricity
Road and self shifter drive metal-oxide-semiconductor sub-circuit；
Wherein, metal-oxide-semiconductor is driven in the input terminal connection self shifter driving metal-oxide-semiconductor sub-circuit of the dual comparator sub-circuit
Grid, the output end of the dual comparator sub-circuit connects the input terminal of the logic subcircuit, the logic subcircuit
Output terminates the self shifter and drives metal-oxide-semiconductor sub-circuit.
The circuit real-time detection drive metal-oxide-semiconductor grid voltage, according to the size of grid voltage, in three frame picture cycles by
Gradually judge required driving metal-oxide-semiconductor number.It solves to require in very wide range of current output simultaneously in existing LED drive chip
Ensure to export the preferable consistency problem of electric current.
Referring to fig. 2, the dual comparator sub-circuit includes first comparator and the second comparator；
Wherein, the input of first comparator terminates reference voltage cathode；The second ratio of reference voltage termination of first comparator
Compared with the reference voltage end of device, reference end is formed, described drive in metal-oxide-semiconductor sub-circuit with reference to the termination self shifter drives MOS
The grid of pipe；The output end of first comparator forms the first output end, connects the first input end of the logic subcircuit；
The input termination reference voltage anode of second comparator, the output end of the second comparator form second output terminal, connect
Second input terminal of the logic subcircuit.
Specifically, dual comparator sub-circuit be used to driving the grid end voltage VG of metal-oxide-semiconductor respectively with the ginseng of first comparator
The reference voltage VG- for examining voltage VG+ and the second comparator compares.VG+ and VG- is used to set the driving metal-oxide-semiconductor for making shift by oneself
Gate voltage range, preset VG range are as follows: VG- < VG < VG+.Dual comparator exports comparison result vds_H and vds_L, input
To the logic subcircuit.
Referring to Fig. 3, the self shifter driving metal-oxide-semiconductor sub-circuit includes the first amplifier OP1, the second amplifier OP2, perseverance
Stream source l1, driving metal-oxide-semiconductor MB and diode (LED)；
The driving metal-oxide-semiconductor includes several group selection metal-oxide-semiconductors parallel with one another；Selecting metal-oxide-semiconductor includes the first metal-oxide-semiconductor and the
Two metal-oxide-semiconductors；The grid of first metal-oxide-semiconductor and the second metal-oxide-semiconductor is all connected with the stationary contact of an electronic switch, the dynamic touching of the first of electronic switch
Point ground connection, the second movable contact of electronic switch are connected to the output end of the first amplifier OP1；First metal-oxide-semiconductor and the second metal-oxide-semiconductor
Source grounding；The drain of first metal-oxide-semiconductor connects the electrode input end of the first amplifier OP1, and the drain of the second metal-oxide-semiconductor connects second and puts
The negative input of big device OP2；The grid of all first metal-oxide-semiconductors and the second metal-oxide-semiconductor is connected with each other, and connects the dual comparator
The input terminal of sub-circuit；
The output end of the logic subcircuit is connect with the control terminal of the electronic switch；
The electrode input end of first amplifier OP1 connects the electrode input end of the second amplifier OP2；First amplifier OP1
Negative input connect constant pressure source, the grid of the output termination metal-oxide-semiconductor MB of the second amplifier OP2, the source electrode of metal-oxide-semiconductor MB connects second
The drain of the negative input of amplifier OP2, metal-oxide-semiconductor MB connects the first amplification by successively reversal connection diode (LED), series connection constant-current source
The electrode input end of device OP1.
Specifically, such as the self shifter of Fig. 3 driving metal-oxide-semiconductor sub-circuit includes three group selection metal-oxide-semiconductors.The self shifter is driven
Dynamic metal-oxide-semiconductor sub-circuit controls signal, automatic adjustment driving metal-oxide-semiconductor circuit according to the self shifter of input.
Preferably, each output end of the logic subcircuit is connected to the control of electronic switch in every group selection metal-oxide-semiconductor
End processed.Specifically, an output end of logic subcircuit controls all electronic switches in a group selection metal-oxide-semiconductor simultaneously and disconnects or close
It closes.
Preferably, the driving metal-oxide-semiconductor further includes one group of default metal-oxide-semiconductor；
Defaulting metal-oxide-semiconductor includes third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor；The grid of third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor is connected to
The output end of first amplifier OP1；The source grounding of third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor；The drain of third metal-oxide-semiconductor connects first
The electrode input end of amplifier OP1, the drain of the 4th metal-oxide-semiconductor connect the negative input of the second amplifier OP2；All 3rd MOS
The grid of pipe and the 4th metal-oxide-semiconductor is connected with each other, and connects the input terminal of the dual comparator sub-circuit.
Specifically, the output end of the first amplifier OP1 is directly connected to third metal-oxide-semiconductor and the 4th MOS in default metal-oxide-semiconductor
Pipe indicates be how many regardless of the size of grid voltage, can all default driving third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor.Third metal-oxide-semiconductor
It is not controlled by logic subcircuit with the 4th metal-oxide-semiconductor.
Fig. 3 is that self shifter of the invention drives metal-oxide-semiconductor sub-circuit.I1 is constant-current source, for exporting electric current driving LED light
Pearl.First amplifier OP1 is used to clamp the source and drain end voltage of input driving metal-oxide-semiconductor, and the second amplifier OP2 drives for clamping output
The source and drain end voltage of dynamic metal-oxide-semiconductor.
Fig. 3 totally four groups of driving metal-oxide-semiconductors, which is respectively 1:1:2:4, that is, is defaulted
The finger number of third metal-oxide-semiconductor M0_0 and the 4th metal-oxide-semiconductor M1_0 are fingers=1 in metal-oxide-semiconductor, the in the first group selection metal-oxide-semiconductor
The finger number of one metal-oxide-semiconductor M0_1 and the second metal-oxide-semiconductor M1_1 are fingers=1, the first metal-oxide-semiconductor in the second group selection metal-oxide-semiconductor
The finger number of M0_2 and the second metal-oxide-semiconductor M1_2 are fingers=2, the first metal-oxide-semiconductor M0_3 and the in third group selection metal-oxide-semiconductor
The finger number of two metal-oxide-semiconductor M1_3 is fingers=4.M0_0 and M1_0 is often connected in default metal-oxide-semiconductor.First metal-oxide-semiconductor and second
The turn-on logic of metal-oxide-semiconductor can be set as: when en_1 is " 1 ", M0_1 and M1_1 conducting in the first group selection metal-oxide-semiconductor；Work as en_
2 when being " 1 ", M0_2 and M1_2 conducting in the second group selection metal-oxide-semiconductor；When en_4 is " 1 ", M0_3 in third group selection metal-oxide-semiconductor
It is connected with M1_3.
Preferably, the logic subcircuit is digital circuit, including two input terminals and several output ends；
Described two input terminals include first input end and the second input terminal；
Specifically, Fig. 4 is a kind of state diagram of logic subcircuit of the invention.After logic subcircuit starting, into state 0
(default conditions), { en_4, en_2, en_1 }={ 0,0,0 }, the finger number of default metal-oxide-semiconductor M0_0 and M1_0 are fingers=
1.VG voltage is sent to dual comparator sub-circuit at this time, if VG- < VG < VG+, vds_H=0, vds_L=0, maintains conducting
Driving metal-oxide-semiconductor invariable number.
If VG > VG+, vds_H=1, vds_L=0, into state 1, i.e.,
{ en_4, en_2, en_1 }={ 0,0,1 }, the first group selection metal-oxide-semiconductor conducting, since the metal-oxide-semiconductor number of conducting increases
One times, VG voltage drops to pre-set interval, i.e. VG- < VG < VG+ again.
Continuing to increase LED drive current, VG increases, if VG > VG+, vds_H=1, vds_L=0, into state 2,
{ en_4, en_2, en_1 }={ 0,1,1 }, the first group selection metal-oxide-semiconductor and the conducting of the second group selection metal-oxide-semiconductor.
Continuing to increase LED drive current, VG increases, if VG > VG+, vds_H=1, vds_L=0, into state 3,
{ en_4, en_2, en_1 }={ 1,1,1 }, the first group selection metal-oxide-semiconductor, the second group selection metal-oxide-semiconductor and third group selection metal-oxide-semiconductor are equal
Conducting.
Fig. 5 is output current gain and VG relation curve of the invention.Igain is LED drive current, preset VG >
VG- is gradually increased LED drive current, and VG voltage constantly increases, and when VG voltage reaches VG+, switching driving metal-oxide-semiconductor gear makes
Gradually switching driving metal-oxide-semiconductor gear is obtained, totally four gear sections, respectively 0 < Igain≤Igain1, Igain1 < Igain≤
Igain2、Igain2<Igain≤Igain3、Igain>Igain3。
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover within the scope of the claims and the description of the invention.
Claims (7)
1. a kind of self shifter of LED drive chip adjusts circuit, which is characterized in that including dual comparator sub-circuit, logic
Circuit and self shifter drive metal-oxide-semiconductor sub-circuit；
Wherein, the grid of metal-oxide-semiconductor are driven in the input terminal connection self shifter driving metal-oxide-semiconductor sub-circuit of the dual comparator sub-circuit
The output end of pole, the dual comparator sub-circuit connects the input terminal of the logic subcircuit, the output of the logic subcircuit
Terminate the self shifter driving metal-oxide-semiconductor sub-circuit.
2. the self shifter of LED drive chip adjusts circuit according to claim 1, which is characterized in that
The dual comparator sub-circuit includes first comparator and the second comparator；
Wherein, the input of first comparator terminates reference voltage cathode；The reference voltage of first comparator terminates the second comparator
Reference voltage end, form reference end, it is described to drive metal-oxide-semiconductor with reference to terminating in self shifter driving metal-oxide-semiconductor sub-circuit
Grid；The output end of first comparator forms the first output end, connects the first input end of the logic subcircuit；
The input termination reference voltage anode of second comparator, the output end of the second comparator form second output terminal, connect described
Second input terminal of logic subcircuit.
3. the self shifter of LED drive chip adjusts circuit according to claim 2, which is characterized in that
The logic subcircuit is digital circuit, including two input terminals and several output ends；
Described two input terminals include first input end and the second input terminal.
4. the self shifter of LED drive chip adjusts circuit according to claim 3, which is characterized in that
The self shifter driving metal-oxide-semiconductor sub-circuit includes the first amplifier OP1, the second amplifier OP2, constant-current source l1, driving
Metal-oxide-semiconductor MB and diode (LED)；
The driving metal-oxide-semiconductor includes several group selection metal-oxide-semiconductors parallel with one another；Selecting metal-oxide-semiconductor includes the first metal-oxide-semiconductor and second
Metal-oxide-semiconductor；The grid of first metal-oxide-semiconductor and the second metal-oxide-semiconductor is all connected with the stationary contact of an electronic switch, the first movable contact of electronic switch
Ground connection, the second movable contact of electronic switch are connected to the output end of the first amplifier OP1；The source of first metal-oxide-semiconductor and the second metal-oxide-semiconductor
Extremely it is grounded；The drain of first metal-oxide-semiconductor connects the electrode input end of the first amplifier OP1, and the drain of the second metal-oxide-semiconductor connects the second amplification
The negative input of device OP2；The grid of all first metal-oxide-semiconductors and the second metal-oxide-semiconductor is connected with each other, and connects dual comparator
The input terminal of circuit；
The output end of the logic subcircuit is connect with the control terminal of the electronic switch；
The electrode input end of first amplifier OP1 connects the electrode input end of the second amplifier OP2；First amplifier OP1's is negative
Pole input termination constant pressure source, the grid of the output termination metal-oxide-semiconductor MB of the second amplifier OP2, the source electrode of metal-oxide-semiconductor MB connect the second amplification
The drain of the negative input of device OP2, metal-oxide-semiconductor MB connects the first amplifier by successively reversal connection diode (LED), series connection constant-current source
The electrode input end of OP1.
5. the self shifter of LED drive chip adjusts circuit according to claim 4, which is characterized in that
Each output end of the logic subcircuit is connected to the control terminal of electronic switch in every group selection metal-oxide-semiconductor.
6. the self shifter of LED drive chip adjusts circuit according to claim 4, which is characterized in that
The driving metal-oxide-semiconductor further includes one group of default metal-oxide-semiconductor；
Defaulting metal-oxide-semiconductor includes third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor；The grid of third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor is connected to first
The output end of amplifier OP1；The source grounding of third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor；The drain of third metal-oxide-semiconductor connects the first amplification
The electrode input end of device OP1, the drain of the 4th metal-oxide-semiconductor connect the negative input of the second amplifier OP2；All third metal-oxide-semiconductors and
The grid of 4th metal-oxide-semiconductor is connected with each other, and connects the input terminal of the dual comparator sub-circuit.
7. the self shifter of LED drive chip adjusts circuit according to claim 4, which is characterized in that
It is described to select metal-oxide-semiconductor for three groups.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022127468A1 (en) * | 2020-12-17 | 2022-06-23 | 北京集创北方科技股份有限公司 | Power supply circuit, driving chip and display apparatus |
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