CN106535412A - Digital-analogue dimming circuit with shared port - Google Patents
Digital-analogue dimming circuit with shared port Download PDFInfo
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- CN106535412A CN106535412A CN201611188715.XA CN201611188715A CN106535412A CN 106535412 A CN106535412 A CN 106535412A CN 201611188715 A CN201611188715 A CN 201611188715A CN 106535412 A CN106535412 A CN 106535412A
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- comparator
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
Abstract
The invention discloses a digital-analogue dimming circuit with a shared port. The digital-analogue dimming circuit comprises a comparator module, buffer modules and a gate logic module, wherein the comparator module comprises a first comparator A1 and a second comparator A2; the first comparator A1 processes digital dimming and controls a working state of an enable pin EN of the second comparator A2 through the buffer modules B1 and B2 and a capacitor C, the second comparator A2 processes analogue dimming, and dimming signals processed by the two comparators are output through an OR gate or and an AND gate and of the gate logic module. The digital-analogue dimming circuit with the shared port has the beneficial effects that one input port of integrating analogue dimming and digital dimming has analogue dimming and digital dimming functions, meanwhile, the structure is simple and the chip area and the packaging cost are reduced.
Description
Technical field
The present invention relates to the digital simulation light adjusting circuit that electronic circuit technology field, especially a kind of port share.
Background technology
LED power chip generally has the function of simulation light modulation and digital dimming, but LED power chip is simulated and numeral
Dimming function is usually different input ports, and different circuit modular structures is also increased while increased circuit complexity
Chip area and packaging cost.
Therefore, for LED power driving, the digital simulation light adjusting circuit that port shares can integrate simulation well
With the function of digital dimming, and it is input into by a port, so as to save chip area and packaging cost.
The content of the invention
The technical problem to be solved is：The digital simulation light adjusting circuit that a kind of port shares, Ke Yitong are provided
Cross an input port to realize simulating the function with digital dimming, to overcome the deficiencies in the prior art.
What the present invention was realized in：
The digital simulation light adjusting circuit that a kind of port shares, including comparator module, buffer module, gate logic module, compare
Device module is made up of first comparator A1 and the second comparator A2, first comparator A1 in-phase input end connection reference voltage
Vref, inverting input connection the second comparator A2 in-phase ends P and OR gate or input IN2, output end connection buffer B1
Input；Second comparator A2 in-phase input ends connect first comparator A1 reverse input end and OR gate or input IN2, reversely
Input connects sawtooth signal Vpeak, Enable Pin EN connection buffer B2 output ends and OR gate or input IN1, output
End connection gate logic module with door and inputs；Buffer module is made up of two buffers B1, B2 and electric capacity C, wherein delaying
Device B1 inputs connection first comparator A1 output end is rushed, output end connection electric capacity C and buffer B2, the electric capacity C other ends are grounded,
Buffer B2 output ends connect the second comparator A2 EN ends and OR gate or input IN1；Gate logic module by OR gate or and
Constitute with door and, wherein OR gate or inputs IN1 connection buffer B2 output ends, input IN2 connections first comparator A1 are anti-
Phase input and the second comparator A2 in-phase input ends, output end connection and door and input IN2；It is connected with door and inputs
Second comparator A2 output ends.
In the digital simulation light adjusting circuit that a kind of aforesaid port shares, the second comparator A2 Enable Pins EN are high level
When, comparator normal work；When comparator A2 Enable Pins EN are low level, comparator is output as high level.
In the digital simulation light adjusting circuit that a kind of aforesaid port shares, first comparator A1 processes digital dimming and controls
The working condition of the second comparator A2, the second comparator A2 process simulation light modulations.
In the digital simulation light adjusting circuit that a kind of aforesaid port shares, during simulation light modulation input, comparator A1 backward ends
Input signal Vin, comparator A1 hold reference voltage Vref, and comparator A2 backward ends to be input into the peak value of sawtooth signal in the same direction
The relation of Vpeak meets：Vin ＜ Vpeak ＜ Vref.
In the digital simulation light adjusting circuit that a kind of aforesaid port shares, buffer B1 electric capacity C is had the velocity of discharge it is fast,
The slow function of charging rate.
In the digital simulation light adjusting circuit that a kind of aforesaid port shares, gate logic module is respectively with door and inputs
Simulation dim signal DIM_A and digital dim signal DIM_D.
In the digital simulation light adjusting circuit that a kind of aforesaid port shares, the second comparator A2 output ends are simulation light modulation letter
Number DIM_A, gate logic module OR gate or output ends are digital dimming signal DIM_D.
Compared with prior art, it is to incorporate simulation light modulation to connect with the input of digital dimming that beneficial effects of the present invention are
Mouthful so that input port has the function of analog- and digital- light modulation simultaneously, while simple structure, save chip area with
Packaging cost.
Description of the drawings
Accompanying drawing 1 is the principle schematic of the present invention；
Input voltage and output voltage graph of a relation when accompanying drawing 2 is present invention simulation light modulation input；
Accompanying drawing 3 is input voltage and output voltage graph of a relation when digital dimming of the present invention is input into.
Specific embodiment
Embodiments of the invention：The digital simulation light adjusting circuit that a kind of port shares, as shown in drawings, including comparator mould
Block, buffer module, gate logic module, comparator module are made up of first comparator A1 and the second comparator A2, and first compares
Device A1 in-phase input ends connect reference voltage Vref, and it is defeated that inverting input connects the second comparator A2 in-phase ends P and OR gate or
Enter and hold IN2, output end connection buffer B1 inputs；Second comparator A2 in-phase input ends connection first comparator A1 is reversely defeated
Enter end and OR gate or input IN2, reverse input end connection sawtooth signal Vpeak, the connection buffer B2 outputs of Enable Pin EN
End and OR gate or input IN1, output end connection gate logic module with door and inputs；Buffer module is slow by two
Rush device B1, B2 and electric capacity C compositions, wherein buffer B1 inputs connection first comparator A1 output end, output end connection electric capacity C
With buffer B2, electric capacity C other ends ground connection, buffer B2 output ends connect the second comparator A2 EN ends and OR gate or inputs
End IN1；Gate logic module is constituted by OR gate or and with door and, wherein OR gate or inputs IN1 connection buffer B2 outputs
End, input IN2 connection first comparator A1 inverting inputs and the second comparator A2 in-phase input ends, output end connection and door
And input IN2；It is connected the second comparator A2 output ends with door and inputs.
When wherein the second comparator A2 Enable Pins EN are high level, comparator normal work；Comparator A2 Enable Pins EN are
During low level, comparator is output as high level；First comparator A1 processes digital dimming and controls the work of the second comparator A2
State, the second comparator A2 process simulation light modulations.
During simulation light modulation input, comparator A1 backward end input signals Vin, comparator A1 hold reference voltage Vref in the same direction,
And the relation of the peak value Vpeak of comparator A2 backward ends input sawtooth signal meets：Vin ＜ Vpeak ＜ Vref, and buffer
Device B1 has to electric capacity C that the velocity of discharge is fast, the function that charging rate is slow, and gate logic module is respectively simulated with door and inputs
Dim signal DIM_A1 and digital dim signal DIM_D2, the second comparator A2 output ends are simulation dim signal DIM_A1, door
Logic module OR gate or output ends are digital dimming signal DIM_D2.
In the present embodiment, comparator module includes first, second comparator A1 and A2, first comparator A1 process numeral
Dim and control by buffer module B1, B2 and electric capacity C the Enable Pin EN working condition of the second comparator A2, the second comparator
A2 process simulation light modulations, the dim signal Jing after two comparators are processed again by the OR gate or of gate logic module and with door and
Output.
Specifically operation principle is：
When second comparator A2 Enable Pins EN are high level, comparator normal work；Second comparator A2 Enable Pins EN are low electricity
At ordinary times, comparator is output as high level.
During simulation light modulation input, first comparator A1 backward end input signal Vin, first comparator A1 are held in the same direction with reference to electricity
Pressure Vref, and the relation satisfaction of the peak value Vpeak of the second comparator A2 backward ends input sawtooth signal：Vin ＜ Vpeak ＜
Vref.Now, first comparator A1 is output as high level, is still high level, i.e. Enable Pin after buffered device B1, B2 and electric capacity C
EN is high level, the second comparator A2 normal works, as the input of comparator A2 inverting inputs N and in-phase input end P is believed
Number sawtooth waveforms and Vin are respectively, comparator output DIM_A is square-wave signal Jing after relatively, and mono- input IN1 of OR gate or is
Height, then be input into DIM_D for height with mono- input IN2 of door and.Then output end out output signal is and DIM_A identical square waves
Signal, and Vin is bigger, the dutycycle of square-wave signal is bigger, as shown in Figure 2.
When digital dimming is input into, buffer B1 has to electric capacity C that the velocity of discharge is fast, the function that charging rate is slow, when first
During comparator A1 backward end supplied with digital signal, first comparator A1 is output as and input signal identical data signal.Now,
As the effect of buffer B1 and electric capacity C, the output end signal of buffer B2 remain low level, i.e. the second comparator A2 is enabled
EN is invalid at end, and the second comparator A2 is output as high level, and an input IN1 of OR gate or is low level, and OR gate or's is another
Individual input IN2 is input signal Vin, is high level with mono- input IN1 input DIM_A of door and, then output end out is defeated
Go out and input signal Vin identical data signal, as shown in Figure 3.
The description of such scheme is the invention for being understood that for ease of those skilled in the art and using, and is familiar with
The personnel of art technology obviously easily can make various modifications to embodiment, therefore, the invention is not restricted to above-mentioned reality
Scheme, those skilled in the art's the method according to the invention, the improvement made without departing from scope and modification all should
Within protection scope of the present invention.
Claims (7)
1. the digital simulation light adjusting circuit that a kind of port shares, including comparator module, buffer module, gate logic module, its
It is characterised by：Comparator module is made up of first comparator A1 and the second comparator A2, and first comparator A1 in-phase input end connects
Reference voltage Vref is connect, inverting input connection the second comparator A2 in-phase ends P and OR gate or input IN2, output end connect
Connect buffer B1 inputs；Second comparator A2 in-phase input ends connect first comparator A1 reverse input end and OR gate or inputs
End IN2, reverse input end connection sawtooth signal Vpeak, Enable Pin EN connection buffer B2 output ends and OR gate or inputs
End IN1, output end connection gate logic module with door and inputs；Buffer module is by two buffers B1, B2 and electric capacity C
Composition, wherein buffer B1 inputs connection first comparator A1 output end, output end connection electric capacity C and buffer B2, electric capacity C
The other end is grounded, and buffer B2 output ends connect the second comparator A2 EN ends and OR gate or input IN1；Gate logic module
Constitute by OR gate or and with door and, wherein OR gate or inputs IN1 connection buffer B2 output ends, input IN2 connections the
One comparator A1 inverting inputs and the second comparator A2 in-phase input ends, output end connection and door and input IN2；With door
And inputs connect the second comparator A2 output ends.
2. the digital simulation light adjusting circuit that a kind of port according to claim 1 shares, it is characterised in that：Second comparator
When A2 Enable Pins EN are high level, comparator normal work；When comparator A2 Enable Pins EN are low level, comparator is output as height
Level.
3. the digital simulation light adjusting circuit that a kind of port according to claim 1 shares, it is characterised in that：First comparator
A1 processes digital dimming and controls the working condition of the second comparator A2, the second comparator A2 process simulation light modulations.
4. the digital simulation light adjusting circuit that a kind of port according to claim 1 shares, it is characterised in that：Simulation light modulation is defeated
Fashionable, comparator A1 backward end input signals Vin, comparator A1 hold reference voltage Vref, and comparator A2 backward ends in the same direction
The relation of the peak value Vpeak of input sawtooth signal meets：Vin ＜ Vpeak ＜ Vref.
5. the digital simulation light adjusting circuit that a kind of port according to claim 1 shares, it is characterised in that：B1 pair, buffer
Electric capacity C has that the velocity of discharge is fast, the function that charging rate is slow.
6. the digital simulation light adjusting circuit that a kind of port according to claim 1 shares, it is characterised in that：Gate logic module
Dim signal DIM_A is simulated respectively with door and inputs（1）With digital dim signal DIM_D（2）.
7. the digital simulation light adjusting circuit that a kind of port according to claim 1 shares, it is characterised in that：Second comparator
A2 output ends are simulation dim signal DIM_A（1）, gate logic module OR gate or output ends are digital dimming signal DIM_D（2）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611188715.XA CN106535412B (en) | 2016-12-21 | 2016-12-21 | The digital simulation light adjusting circuit that a kind of port shares |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611188715.XA CN106535412B (en) | 2016-12-21 | 2016-12-21 | The digital simulation light adjusting circuit that a kind of port shares |
Publications (2)
| Publication Number | Publication Date |
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| CN106535412A true CN106535412A (en) | 2017-03-22 |
| CN106535412B CN106535412B (en) | 2018-07-10 |
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| CN201611188715.XA Active CN106535412B (en) | 2016-12-21 | 2016-12-21 | The digital simulation light adjusting circuit that a kind of port shares |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107027224A (en) * | 2017-06-09 | 2017-08-08 | 厦门奇力微电子有限公司 | A kind of LED light adjusting circuits and LED drive circuit |
| CN108322964A (en) * | 2018-04-03 | 2018-07-24 | 深圳茂硕电子科技有限公司 | LED drive power circuit |
| EP3457814A1 (en) | 2017-09-15 | 2019-03-20 | Yu Jing Energy Technology Co., Ltd. | Dimming control optimization system |
| CN109526091A (en) * | 2017-09-20 | 2019-03-26 | 昱京能源科技股份有限公司 | Dimming control system |
| CN116112002A (en) * | 2023-04-12 | 2023-05-12 | 长鑫存储技术有限公司 | Comparison circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107027224A (en) * | 2017-06-09 | 2017-08-08 | 厦门奇力微电子有限公司 | A kind of LED light adjusting circuits and LED drive circuit |
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| CN109526091A (en) * | 2017-09-20 | 2019-03-26 | 昱京能源科技股份有限公司 | Dimming control system |
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| CN116112002A (en) * | 2023-04-12 | 2023-05-12 | 长鑫存储技术有限公司 | Comparison circuit |
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| Publication number | Publication date |
|---|---|
| CN106535412B (en) | 2018-07-10 |
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