CN107613603A - LED delays bright control system - Google Patents
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Abstract
Provide a kind of LED and delay bright control system.LED illumination is delayed bright control system and included：Input block, it is configured as carrying out rectification to the input voltage of system；Constant-current control unit, it is configured as receiving rectified voltage, and output control electric current is with the load current of controlling stream overload unit；And timing unit, timing unit are couple to constant-current control unit, and the power up phase in system is configured as so that load current changes over time.
Description
Technical field
Certain embodiments of the present invention is related to integrated circuit.It is used for more specifically, some embodiments of the present invention provide
The system of LED switch control.
Background technology
LED as a kind of new type light source of energy-conserving and environment-protective, the advantages of due to high brightness, low-power consumption and long lifespan and
It is widely used in every field.Because close in the range of rated current, LED luminosity is directly proportional to the electric current flowed through
And it is unrelated with the voltage at its both ends, therefore LED wishes constant-current source to power at work.
Fig. 1 is the diagram for showing traditional LED illumination current constant control schematic diagram.As shown in figure 1, the system 100 of LED illumination
Including input block 100 (including for example, fuse F1 and rectifier bridge U1), constant-current control unit 120 and load unit 130
(including for example, LED lamp bead V3, output capacitance C1).Different system control architectures is mainly reflected in the difference of constant-current control unit
It is different, such as Switching Power Supply current constant control framework and linear constant current control framework, wherein include boost again in Switching Power Supply control,
The current constant control framework such as buck, flyback, buck-boost.The main target of this kind of constant-current control unit be system just
Often maintain the electric current of output LED load constant during work.
As shown in figure 1, after system electrification, ac input voltage (for example, VAC) is received, and carries out full-wave rectification processing
To generate rectified voltage.For example, rectified voltage does not drop to less than 0 volt.For example, in constant-current control unit 120
The amplifier in portion controls GATE terminal voltages power adjustment pipe (not shown) is on or off state after the power-up, so as to control
The constant current hold of LED lamp bead in load unit processed.
Because the brightness of LED lamp bead is by flowing through LED operating current IledIt is determined that so most of LED illumination Systems are adopted
The control mode of constant current control LED operation electric current is taken to reach the purpose of constant LED lamp bead brightness.
In general LED illumination product, due to current constant control system establish quickly, user using when be clearly felt that brightness
Suddenly change, the particularly larger LED illumination device of power, be easier under the conditions of ambient light is dark in booting moment pair
Human eye produces bright stimulate.
Therefore, it is necessary to which improved LED delays bright control system.
The content of the invention
Certain embodiments of the present invention is related to integrated circuit.Delay more specifically, some embodiments of the present invention provide LED
Bright control system.Only as an example, some embodiments of the present invention are applied to LED illumination.It is it will be appreciated, however, that of the invention
There is the wider scope of application.
The present invention proposes a kind of LED illumination System and method for delaying bright control of invention, can accurately control
Output current is slowly varying with the time after powering for LED information display system, so as to reach the comfortable perception of the human eye vision of optimization.Further
, control method of the invention goes for the multiple fields such as house, building, business and the special LED illumination of industry.
According to one embodiment, there is provided a kind of LED illumination delays bright control system, including：Input block, is configured as pair
The input voltage of system carries out rectification；Constant-current control unit, it is configured as receiving rectified voltage, and output control electric current
With the load current of controlling stream overload unit；And timing unit, timing unit are couple to constant-current control unit, and by with
The power up phase in system is set to so that load current changes over time.
According to another embodiment, there is provided it is a kind of including as described in embodiment of the disclosure be used for LED switch control
The LED lamp of system.
According to embodiment, one or more benefits can be obtained.With reference to subsequent detailed description and accompanying drawing, these benefits
Various additional purposes, feature and advantage with the present invention can thoroughly be understood.
Brief description of the drawings
Fig. 1 is the diagram for showing traditional LED illumination current constant control schematic diagram.
Fig. 2 is that LED illumination in accordance with an embodiment of the present disclosure delays bright control principle drawing.
Fig. 3 is that the LED illumination of embodiment according to Fig. 2 delays bright curve diagram.
Fig. 4 a be in accordance with an embodiment of the present disclosure, realize delay bright and current constant control schematic diagram.
Fig. 4 b are to realize slow bright diagram according to Fig. 4 a embodiment, control constant current unit reference voltage.
Fig. 5 a be in accordance with an embodiment of the present disclosure, realize delay bright and current constant control another schematic diagram.
Fig. 5 b are to realize slow bright diagram according to the embodiment of Fig. 5 a, controlling dead error time.
Fig. 6 be in accordance with an embodiment of the present disclosure, control constant-current controller reference voltage and dead time ToffRealize slow
Bright schematic diagram.
Fig. 7 a are a kind of diagrams for the framework for realizing slow bright timing control in accordance with an embodiment of the present disclosure.
Fig. 7 b are the diagrams for another framework for realizing slow bright timing control in accordance with an embodiment of the present disclosure.
Fig. 7 c are the diagrams for the another framework for realizing slow bright timing control in accordance with an embodiment of the present disclosure.
Embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In the following detailed description
Many details are proposed, to provide complete understanding of the present invention.It is but very bright to those skilled in the art
Aobvious, the present invention can be implemented in the case of some details in not needing these details.Below to embodiment
Description is used for the purpose of by showing that the example of the present invention is better understood to provide to the present invention.The present invention is never limited to down
Any concrete configuration and algorithm that face is proposed, but element, part are covered under the premise of without departing from the spirit of the present invention
With any modification, replacement and the improvement of algorithm.In the the accompanying drawings and the following description, known structure and technology is not shown, with
Just avoid causing the present invention unnecessary obscure.
Fig. 2 is that LED illumination in accordance with an embodiment of the present disclosure delays bright control principle drawing.Fig. 2 is only example, and it should not discomfort
The scope of locality limitation claim.It will be appreciated by those of ordinary skill in the art that many changes, substitutions and modifications.Shown in Fig. 2
LED illumination Constant Current Control System 200 include input block 210, constant-current control unit 220, load unit 230 and timing list
Member 240.
As shown in Fig. 2 after system electrification, ac input voltage (for example, VAC) is received, and carries out full-wave rectification processing
To generate rectified voltage.For example, rectified voltage does not drop to less than 0 volt.For example, in constant-current control unit 220
The amplifier in portion controls GATE terminal voltages power adjustment pipe (not shown) is on or off state after the power-up, so as to control
The constant current hold of LED lamp bead in load unit processed.
After the power-up, control gate terminal voltage makes power adjustment pipe be on or turn off to the error amplifier of control unit
State.Work as VoutWhen voltage is higher than LED minimum breakdown voltage, electric current exports constant LED current I by LEDled, with control
LED lamp bead.
Wherein timing unit 240 couples with the phase of constant-current control unit 220, between controlling constant-current control unit 220, from
And the output LED current of system 200 is set to be changed over time in system boot power up phase.
Fig. 3 is that the LED illumination of embodiment according to Fig. 2 delays bright curve diagram.As shown in figure 3, show a kind of human eye
Perception more comfortably delays bright curve.Time t increases since 0 after system boot, corresponding system output LED current also from
0 starts to change, and when the time reaching system set-up time tf, LED current reaches the maximum of system design, i.e., 100% output
Size of current simultaneously no longer changes over time later, and now system boot delays bright end.Delay bright time tf among these by timing in Fig. 2
Unit 240 realizes, and 0 changes with time relation then by 240 output signal time to LED current ILED is exported during tf
It is controlled into constant-current control unit 220.
Fig. 4 a be in accordance with an embodiment of the present disclosure, realize delay bright and current constant control schematic diagram.Fig. 4 a are only examples, its
It should not unduly limit the scope of claim.It will be appreciated by those of ordinary skill in the art that many changes, substitutions and modifications.
No matter constant-current control unit takes Switching Power Supply current constant control framework or linear constant current control in current main LED illumination System
Framework processed, its basic control principle are that detecting can characterize the feedback signal of output LED current from system and controller produces
Constant reference voltage is compared or error amplification, and control system power stage realizes constant current.Fig. 4 a give one kind and are based on
One example of the slow bright control principle of the present invention, main slow bright and constant-current control unit include timer U401, with reference to electricity
Generation unit U402 and constant-current control unit U403 is pressed, the power stage unit in current constant control is U2.Fig. 4 a systems are delayed bright substantially
It is exactly that control signal (for example, time signal time) is produced by counter U401 to control CC (constant current) with constant current control method
Unit U403 input reference voltage Vref, the control are completed in reference voltage unit U402.
Fig. 4 b are to realize slow bright diagram according to Fig. 4 a embodiment, control constant current unit reference voltage.Work as system
The time, t increased since 0 after start, and the input reference voltage Vref of corresponding CC constant-current control units also increases since 0, when
When time reaches system set-up time tf, Vref changes to the maximum of design and no longer changed over time later, now system
Bright end is delayed in start.Among these delay bright time tf realized by timing unit U401 in Fig. 4 a, and 0 to Vref during tf with the time
Variation relation is then controlled by U401 output signal time into reference voltage generation unit U402.
Fig. 5 a be in accordance with an embodiment of the present disclosure, realize delay bright and current constant control another schematic diagram.Fig. 5 a only show
Example, it should not unduly limit the scope of claim.It will be appreciated by those of ordinary skill in the art that it is many change, replace and
Modification.For Switching Power Supply current constant control framework, its basic control principle is that detecting can characterize output LED current from system
Feedback signal and controller produce constant reference voltage compared with or error amplify, produce PWM or PFM signals control system
The power switch break-make of system power stage realizes constant current.
Fig. 5 a give a kind of another example of the slow bright control principle based on the present invention, main slow bright and constant current control
Unit processed includes constant-current control unit U501, PWM (pulse width modulation)/PFM (pulse frequency modulated) control units U502, meter
When device U503, dead zone function unit U504, driver element U505, the power stage unit in current constant control is U2.It is controlled substantially
Method is that CC (constant current) units U501 outputs are input to dead band through PWM/PFM control units generation logic control signal pwm_pfm
Time control unit U504, counter U503 generation time timing signals time are input to Power MOSFET unit U504, and
Power MOSFET unit U504 function is addition and timing signal after the cut-off signals end point of normal pwm_pfm signals
The dead band turn-off time related time produces output signal sw, sw and controls power stage U2 realizations permanent after driver element U505 amplifications
Flow control.The method of this control pwm_pfm signal dead times can extend system power switch on-time, and control is opened
Cycle increase is closed, control system output LED current, which is realized, delays bright and constant current.
Fig. 5 b are to realize slow bright diagram according to the embodiment of Fig. 5 a, controlling dead error time.Time t after system boot
Increase since 0, corresponding dead time Tdead is also from T0 (T0>0) start to reduce, system set-up time tf is reached when the time
When, dead time Tdead is reduced to 0 and no longer changed over time later, and now system boot delays bright end.When delaying bright among these
Between tf realize that and 0 to dead time Tdead during the tf relation that changes with time then passes through by timing unit U503 in Fig. 5 a
U503 output signal time is controlled into Power MOSFET unit U504.
Fig. 6 be in accordance with an embodiment of the present disclosure, control constant-current controller reference voltage and dead time ToffRealize slow
Bright schematic diagram.Main slow bright and constant-current control unit includes reference voltage generation unit U601, constant-current control unit U602,
PWM/PFM control units U603, timer U604, dead zone function unit unit U605, driver element U606, in current constant control
Power stage unit is U2.Its basic control method is that counter U503 generation time timing signals time is separately input to reference to electricity
Press generation unit U601 and Power MOSFET unit U605, and in reference voltage generation unit U601 control input to constant current
Reference voltage Vref in control unit, the controlling dead error time Tdead in dead zone function unit unit U605, finally produce and patrol
Collect signal sw controls power stage U2 to realize slow bright and current constant control after driver element U606 amplifications.Timing signal time controls base
The principle of quasi- unit and dead time is similar with figure 4 described above b and Fig. 5 b, no longer repeats herein.
Fig. 7 a are a kind of diagrams for the framework for realizing slow bright timing control in accordance with an embodiment of the present disclosure.Fig. 7 a pass through electricity
It is installed with and puts slow bright timing time, circuit includes constant current Ic, switchs Sw1 and switch controlling signal K1, electric capacity C1 and timing list
First U7, its basic functional principle are that controller produces constant current Ic after system boot, and opens controlling switch SW1, makes
Ic charges to electric capacity C1, and the voltage Vramp sizes on electric capacity C1 are input to timing with charging interval t linear change, Vramp
In unit U7, the time signal time according to corresponding to can producing Vramp voltage swings.
Fig. 7 b are the diagrams for another framework for realizing slow bright timing control in accordance with an embodiment of the present disclosure.Fig. 7 b pass through electricity
Resistance, which is set, delays bright timing time, and circuit includes amplifier unit U6 and M0, current mirror unit M1 and M2, resistance R1 and timing list
First U7, its basic functional principle are that amplifier unit, current mirror unit and resistance R1 produce perseverance jointly after system boot
Determine electric current Ic and be input in timing unit U7：
Ic=K*Vref/R1(equation 3)
Wherein, K represents current mirror coefficient, R1Represent sense resistor R1 resistance, and VrefRepresent amplifier input ginseng
Examine voltage.Timing unit U7 is according to the time signal time produced with electric current Ic size variations.
Fig. 7 c are the diagrams for the another framework for realizing slow bright timing control in accordance with an embodiment of the present disclosure.Fig. 7 c pass through number
Wordclock signal clk, which is set, delays bright timing time, and circuit is conventional digital counting unit, is setting input clock signal
Under clk frequencies or periodic condition, counting unit U7 produces corresponding time signal time according to count number.
In example 1, there is provided a kind of LED illumination delays bright control system, including：Input block, it is configured as to system
Input voltage carry out rectification；Constant-current control unit, is configured as receiving rectified voltage, and output control electric current is to control
System flows through the load current of load unit；And timing unit, timing unit is couple to constant-current control unit, and is configured as
In the power up phase of system load current is changed over time.
In example 2, the timing unit in example 1 is additionally configured to when reaching default maximum, is no longer changed negative
Carry electric current.
In example 3, the timing unit in example 2 includes：Timer, it is configurable to generate time signal；And reference
Voltage generator, reference voltage maker are configured as based on time signal generation reference voltage, and by reference voltage output
It is used as the reference voltage of constant-current control unit to constant-current control unit.
In example 4, the system constant-current control unit in example 1 is configured as being based on reference voltage and feedback signal next life
Into control electric current, wherein the feedback signal characterizes load current.
In example 5, the system in example 1 also includes PWM (pulse width modulation)/PFM (pulse frequency modulated) controls
Unit, PWM/PFM control units are configured as receiving control electric current, and based on control electric current generation logical signal.
In example 6, the timing unit in example 5 includes：Timer, it is configurable to generate time signal；Dead zone function
Unit, it is configured as receiving time signal and logical signal, and based on receipts time signal and logical signal generation trigger signal；
And driver element, it is configured as based on trigger signal control load current.
In example 7, example 6 also includes reference voltage maker, and reference voltage maker is configured as believing based on the time
Number generation reference voltage, and by reference voltage output to constant-current control unit as constant-current control unit reference voltage.
According to an example, timer includes controlling switch, is configured to respond to caused constant electricity after system electrification
Flow and open so that constant current charges to capacitor；Wherein time signal is generated based on the voltage on capacitor, and
And the voltage wherein on capacitor changes linearly over time.
According to an example, timer includes amplifier, current mirror and resistor；Wherein when a system is powered up, timing
Device produces the control electric current according to following formula：
Ic=K*Vref/R1
Wherein, K represents mirror currents mirror coefficient, and R1 represents the resistance of sense resistor, and Vref represents amplifier
Input reference voltage；Wherein time signal is what the size based on control electric current generated.
According to an example, timing unit is configured as based on dagital clock signal come generation timing signal.
Certain embodiments of the present invention is related to integrated circuit.Delay more specifically, some embodiments of the present invention provide LED
Bright control system.Only as an example, some embodiments of the present invention are applied to LED illumination.It is it will be appreciated, however, that of the invention
There is the wider scope of application.
For example, use one or more component softwares, one or more nextport hardware component NextPorts, and/or software and hardware component
One or more combination, some or all components of various embodiments of the present invention each individually and/or with it is at least another
The mode that component combines is carried out.In another example, some or all components of various embodiments of the present invention are each independent
Ground and/or such as one or more analog circuits and/or one or more are embodied in a manner of being combined with least another component
In one or more circuits of individual digital circuit etc.In another example, various embodiments of the present invention and/or example can be with
It is combined.
Although it have been described that the particular embodiment of the present invention, but it should be appreciated by those skilled in the art be present equivalent
In the other embodiments of described embodiment.It should therefore be understood that the present invention is not limited to shown specific embodiment,
And only limited by scope of the following claims.
Claims (11)
1. a kind of LED illumination delays bright control system, including：
Input block, it is configured as carrying out rectification to the input voltage of the system；
Constant-current control unit, it is configured as receiving rectified voltage, and output control electric current is with controlling stream overload unit
Load current；And
Timing unit, the timing unit are couple to the constant-current control unit, and are configured as the upper electricity in the system
Stage causes the load current to change over time.
2. the system as claimed in claim 1, wherein the timing unit is additionally configured to when reaching default maximum, no
Change the load current again.
3. the system as claimed in claim 1, wherein the timing unit includes：
Timer, it is configurable to generate time signal；And
Reference voltage maker, the reference voltage maker are configured as based on time signal generation reference voltage, and
And the reference voltage output to the constant-current control unit is used as to the reference voltage of the constant-current control unit.
4. the system as claimed in claim 1, wherein the constant-current control unit is configured as being based on the reference voltage and institute
Feedback signal is stated to generate the control electric current.
5. the system as claimed in claim 1, in addition to PWM (pulse width modulation)/PFM (pulse frequency modulated) controls are single
Member, the PWM/PFM control units are configured as receiving the control electric current, and based on control electric current generation logic letter
Number.
6. system as claimed in claim 5, wherein the timing unit includes：
Timer, it is configurable to generate time signal
Dead zone function unit, it is configured as receiving the time signal and the logical signal, and is believed based on the time is received
Number and the logical signal generation trigger signal；And
Driver element, it is configured as controlling the load current based on the trigger signal.
7. system as claimed in claim 6, in addition to reference voltage maker, the reference voltage maker is configured as base
Reference voltage is generated in the time signal, and the reference voltage output to the constant-current control unit is used as the perseverance
The reference voltage of flow control unit.
8. the system as described in claim 3 or 6, wherein the timer includes controlling switch, it is configured to respond to described
Caused constant current after system electrification and open so that the constant current to capacitor charge；
Wherein described time signal is generated based on the voltage on the capacitor, and the voltage on wherein described capacitor is
Change linearly over time.
9. the system as described in claim 3 or 6, wherein the timer includes amplifier, current mirror and resistor；
Wherein when the system electrification, the timer produces the control electric current according to following formula：
Ic=K*Vref/R1
Wherein, K represents the mirror currents mirror coefficient, R1Represent the resistance of sense resistor, and VrefIt is defeated to represent amplifier
Enter reference voltage；
Wherein described time signal is what the size based on control electric current generated.
10. the system as claimed in claim 1, wherein the timing unit is configured as based on dagital clock signal to generate
State time signal.
A kind of 11. LED of the system for being used for LED switch control including as described in any one in claim 1-10
Tool.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710743024.XA CN107613603B (en) | 2017-08-25 | 2017-08-25 | LED slow-lighting control system |
| TW106134595A TWI632828B (en) | 2017-08-25 | 2017-10-06 | LED slow light control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710743024.XA CN107613603B (en) | 2017-08-25 | 2017-08-25 | LED slow-lighting control system |
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| Publication Number | Publication Date |
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| CN107613603A true CN107613603A (en) | 2018-01-19 |
| CN107613603B CN107613603B (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710743024.XA Active CN107613603B (en) | 2017-08-25 | 2017-08-25 | LED slow-lighting control system |
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| CN (1) | CN107613603B (en) |
| TW (1) | TWI632828B (en) |
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| CN111432526A (en) * | 2020-04-13 | 2020-07-17 | 昂宝电子（上海）有限公司 | Control system and method for power factor optimization of L ED lighting system |
| CN111511074A (en) * | 2020-05-04 | 2020-08-07 | 陕西亚成微电子股份有限公司 | L ED driving circuit and control method |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201914362A (en) | 2019-04-01 |
| CN107613603B (en) | 2020-01-03 |
| TWI632828B (en) | 2018-08-11 |
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