CN109496006A - A kind of LED constant current control system and method accurately dimmed - Google Patents
A kind of LED constant current control system and method accurately dimmed Download PDFInfo
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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]
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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]
- H05B45/10—Controlling the intensity of the light
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Abstract
The present invention provides a kind of LED constant current control system and method accurately dimmed, comprising: the lamp controller of corresponding dim signal is generated according to the input signal of constant flow module or LED light source；AC power source is converted into current signal, and current signal is adjusted based on dim signal, to obtain the constant flow module of light modulation constant current signal；The constant current output of LED and the LED light source of brightness adjustment control are realized based on light modulation constant current signal.Preliminary brightness adjustment control is carried out to LED light source；The output power of ac input power or LED light source is sampled, sampled value is compared with setting value；Deviation if it exists is finely adjusted dim signal, then multilevel iudge again；Deviation does not adjust dim signal then if it does not exist.The present invention is accurately sampled by the output power to ac input power or LED light source, and the data after sampling are compared according to dimmer command, are adjusted, and is required to ensure that controlled dimmed power value meets control, and then realize accurate light modulation.
Description
Technical field
The present invention relates to a kind of LED control field, the LED constant current control system accurately dimmed more particularly to one kind and side
Method.
Background technique
Constant-current supply is one kind of LED power, is that power supply supply is converted to specific voltage and current to drive LED to shine
Electric pressure converter, be substantially to be fed back using device to electric current, the power supply state of dynamic regulation equipment, so that electric current
Tend to be constant.Under normal conditions, the input of LED drive power includes high pressure industrial frequency AC (i.e. alternating current), low-voltage direct, high straightening
Stream, low-voltage high-frequency exchange (output of such as electronic transformer)；And the output of LED drive power is then most of for can be with LED just
Change and change the constant current source of voltage to voltage drop value.
The light output of LED is proportional to forward current, forward current without stablize will cause LED shine it is unstable, seriously
The use feeling of LED is influenced, and LED is a nonlinear device, the minor change of forward voltage can cause forward current
Great changes；By taking 1W (watt) great power LED as an example, if forward voltage changes 10% (being reduced to 3.1V from 3.4V), it can cause
Forward current is reduced to 100mA from 350mA, changes up to 3.5 times.In addition, LED is a semiconductor diode, its volt-ampere is special
Property changes with temperature.
Therefore, the factor for influencing LED forward current had both included inherence, more complicated also including external.Currently, absolutely
Most LED constant current source and lamp controller are different manufacturers production, due to the discreteness of each producer's product, Intelligent lamp
Linearity light adjusting also cannot achieve.Existing linearity light adjusting product can not also accomplish real linearity light adjusting.
How the linearity light adjusting of LED is realized using the product of different manufacturers, and the stability for improving LED has become
For one of those skilled in the art's urgent problem to be solved.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide the LED constant currents that one kind accurately dims
The problems such as control system and method, LED linear dimming capability is weak in the prior art for solution, and stability is poor.
In order to achieve the above objects and other related objects, the present invention provides a kind of LED constant current control system accurately dimmed,
The LED constant current control system accurately dimmed includes at least:
Lamp controller, constant flow module, LED light source；
The lamp controller receives AC power source, and connects the input terminal of the constant flow module or the LED light source, is described
Constant flow module provides AC power source, and generates corresponding light modulation according to the input signal of the constant flow module or the LED light source
Signal；
The constant flow module is connected to the output end of the lamp controller, and the AC power source is converted to current signal, and
The current signal is adjusted based on the dim signal, to obtain light modulation constant current signal；
The LED light source is connected to the output end of the constant flow module, and the perseverance of LED is realized based on the light modulation constant current signal
Stream output, and complete the brightness regulation of LED.
Preferably, the lamp controller includes LED drive unit, microprocessor, and identity recognizing unit and narrowband Internet of Things are whole
Hold mould group；
The LED drive unit connects the microprocessor, is generated the dim signal by the control of the microprocessor；
The microprocessor receives the input signal of the constant flow module or the LED light source, to the constant flow module or
The input signal of the LED light source is sampled and generates corresponding adjustment signal；
The identity recognizing unit connects the narrowband internet-of-things terminal mould group, be the narrowband internet-of-things terminal mould group into
Row identification；
The narrowband internet-of-things terminal mould group is connected to the microprocessor, to the letter for needing to receive and dispatch in the microprocessor
It number is wirelessly transferred.
It is highly preferred that the identity recognizing unit is set to the internal or external of the microprocessor.
It is highly preferred that the identity recognizing unit includes applied to the SIM card of general grouped wireless network, applied to being based on
The SIM card of cellular protenchyma intranet network or applied to enhancing machine type communication network SIM card.
It is highly preferred that the narrowband internet-of-things terminal mould group includes radio frequency unit, Power Management Unit and simulation number base
Tape cell.
In order to achieve the above objects and other related objects, the present invention also provides the LED constant current controlling parties that one kind accurately dims
Method, the LED constant current control method accurately dimmed include at least:
Step S1: current constant control and preliminary brightness adjustment control are carried out to LED light source based on Background control instruction；
Step S2: sampling the output power of ac input power or LED light source, will the obtained sampled value of sampling with
Setting value is compared；
Step S3: deviation if it exists is then finely adjusted the dim signal according to deviation, and with the light modulation after fine tuning
Signal dims the LED light source, then return step S2；Deviation is then with current dim signal to described if it does not exist
LED light source carries out brightness adjustment control.
Preferably, the setting value is the ideal value of the output power of the ac input power or LED light source.
It preferably, include that electric current is adopted to the method for the output power sampling of the ac input power or the LED light source
Sample or voltage sample.
Preferably, the adjustment process of the dim signal is realized by pid algorithm.
Preferably, the dim signal is pulse width modulating signal.
As described above, the LED constant current control system accurately dimmed of the invention and method, have the advantages that
The LED constant current control system accurately dimmed and method of the invention passes through to ac input power or LED light source
Output power is accurately sampled, and the data after sampling are compared according to dimmer command, are adjusted, to ensure controlled tune
Optical power value meets control and requires；The LED constant current control system accurately dimmed of the invention and method can use different factories
Accurate light modulation is realized in the case where family's product.
Detailed description of the invention
Fig. 1 is shown as a kind of embodiment of the LED constant current control system accurately dimmed of the invention.
Fig. 2 is shown as the structural schematic diagram of lamp controller of the invention.
Fig. 3 is shown as the another embodiment of the LED constant current control system accurately dimmed of the invention.
Fig. 4 is shown as the flow diagram of LED constant current control of the invention.
Component label instructions
1 lamp controller
11 LED drive units
12 microprocessors
121 communication interfaces
122 input output port
123 security function units
124 narrowband internet-of-things terminal mould group commands generate unit
125 identity recognizing units
126 computing units
13 narrowband internet-of-things terminal mould groups
2 constant flow modules
3 LED light sources
S1~S3 step
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to FIG. 1 to FIG. 4.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Embodiment one
As shown in Figure 1, the present embodiment provides the LED constant current control system that one kind accurately dims, the LED accurately dimmed
Constant Current Control System includes at least:
Lamp controller 1, constant flow module 2 and LED light source 3.
As shown in Figure 1, the lamp controller 1 receives AC power source AC, and the input terminal of the LED light source 3 is connected, is described
Constant flow module 2 provides AC power source, and generates corresponding dim signal according to the input signal of the LED light source 3.
Specifically, as shown in Fig. 2, in the present embodiment, the lamp controller 1 includes LED drive unit 11, microprocessor 12
And narrowband internet-of-things terminal mould group 13.
The narrowband internet-of-things terminal mould group 13 is connect with the microprocessor 12, to needing to receive in the microprocessor 12
The signal of hair is wirelessly transferred.In the present embodiment, the narrowband internet-of-things terminal mould group 13 includes radio frequency unit, power supply pipe
Manage unit and simulation digital baseband unit (not shown), to realize the transmitting-receiving of wireless signal.The transmitting-receiving of any wireless signal
Module is suitable for the invention narrowband internet-of-things terminal mould group 13, is not limited to this embodiment.
The microprocessor 12 connects the narrowband internet-of-things terminal mould group 13 and the LED drive unit 11, receives institute
The sampled value of the output power of LED light source 3 is stated, and corresponding adjustment signal is generated according to the sampled value.In the present embodiment,
The sampled value of the output power of the LED light source 3 is sample rate current Ics.As shown in Fig. 2, in the present embodiment, the micro process
Device 12 includes communication interface 121, input output port 122, security function unit 123, the production of narrowband internet-of-things terminal mould group command
Raw unit 124, identity recognizing unit 125 and computing unit 126.
More specifically, the communication interface 121 connects the LED drive unit 11 and the narrowband internet-of-things terminal mould group
13, respectively with the LED drive unit 11 and 13 two-way communication of narrowband internet-of-things terminal mould group.The LED drive unit
The LED lamp source operating parameter exported in 11 is transferred in the microprocessor 12 by the communication interface 121, by described narrow
AT (Attention) instruction is generated with the processing that internet-of-things terminal mould group command generates unit 124, then passes through the communication interface
The AT (Attention) instruction is sent the narrowband internet-of-things terminal mould group 13 by 121；The narrowband Internet of Things is whole simultaneously
Hold mould group 13 that the feedback information after receiving information from the background is transferred to the microprocessor 12 by the communication interface 121,
And the feedback information is identified by the microprocessor 12, to judge whether the operating parameter of LED lamp source is sent to backstage；
In addition, the narrowband internet-of-things terminal mould group 13 will lead to from the control information received from the background the form that AT has been instructed by described
Letter interface 121 is transferred to the microprocessor 12, the microprocessor 12 AT instruction is handled after by the communication
Interface 121 is sent to the LED drive unit 11, realizes the long-range control to LED lamp source with this.
More specifically, the input output port 122 connects each module in internet-of-things terminal, the micro process is realized
The transmitted in both directions of signal is controlled between device 12 and each module.It is described input output port 122 be I O port, can input can also
With output, in the present embodiment, the input include multiple connectivity ports in output port 122, the microprocessor 12 passes through
It is described input output port 122 to other modules send control signal, other modules by it is described input output port 122 to
The microprocessor 12 sends status information or detection information, realizes control of the microprocessor 12 to each module with this.Institute
State sample rate current Ics by it is described input output port 122 enter the microprocessor 12.
More specifically, the security function unit 123 connects each module in internet-of-things terminal, each module is supervised
Control, to ensure that each module works in a secure environment.In the present embodiment, the security function unit 123 by the input
Output port 122 receives each detection signal to judge whether each module works in security context, and security risk is then led to if it exists
Cross it is described input output port 122 issue control signal with adjust working environment or close modules.The hidden danger of working environment
Including but not limited to over-voltage, overcurrent, excess temperature.
More specifically, the narrowband internet-of-things terminal mould group command, which generates unit 124, connects the narrowband internet-of-things terminal
The signal exported in the LED drive unit 11 is transferred to the narrowband internet-of-things terminal in the form that AT is instructed by mould group 13
Mould group 13.In the present embodiment, the narrowband internet-of-things terminal mould group command generates unit 124 and receives the LED drive unit
The LED lamp source operating parameter signal exported in 11, and packet header and packet tail is added to form AT instruction, AT instruction passes through described logical
Letter interface 121, which is transferred in the narrowband internet-of-things terminal mould group 13, is ultimately routed to backstage.
More specifically, the identity recognizing unit 125 connects the narrowband internet-of-things terminal mould group 13, with the protenchyma
Networked terminals mould group 13 carries out identification.The identity recognizing unit 125 is SIM (Subscriber Identity
Module) block, including but not limited to be applied to general grouped wireless network (General Packet Radio Service,
GPRS SIM card) is applied to be based on cellular protenchyma intranet network (Narrow Band Internet of Thing, NB-
IoT SIM card) or be applied to enhancing machine type communication network (Enhanced Machine Type Communication,
EMTC SIM card), it is numerous to list herein.After completing identification, the narrowband internet-of-things terminal mould group 13 is accessed accordingly
Network.In the present embodiment, the identity recognizing unit 125 is set to the inside of the microprocessor 12, can greatly simplify outer
The installation complexity of peripheral device.The identity recognizing unit 125 also can be set in the outside of the microprocessor 12, not with this
Embodiment is limited.
More specifically, the computing unit 126 by it is described input output port 122 receive the current sampling signal
Ics, and the current sampling signal Ics is compared with setting value, according to the current sampling signal Ics and setting value
Difference generates the adjustment signal of the dim signal.The setting value can be set as needed, not limited one by one herein,
In the present embodiment, the setting value is the ideal value of the LED light source output power.
The LED drive unit 11 connects the microprocessor 12, and receives the AC power source AC, the LED driving
Unit 11 receives the adjustment signal that the microprocessor 12 exports, to adjust the dim signal, so that the dimmed power value
It meets the requirements.In the present embodiment, the dim signal is pulse width modulating signal (PWM).
As shown in Figure 1, the constant flow module 2 is connected to the output end of the lamp controller 1, the AC power source AC is converted
For current signal, and the current signal is adjusted based on the dim signal, to obtain light modulation constant current signal.
Specifically, the constant flow module 2 can be the constant current driver circuit for LED of arbitrary structures, for the LED lamp source
3 realize current constant control and brightness adjustment control.The AC power source AC is converted constant current signal, and root by the constant flow module 2
The amplitude of the current signal is adjusted according to the control of the dim signal, and light modulation constant current signal is obtained with this.
As shown in Figure 1, the LED light source 3 is connected to the output end of the constant flow module 2, believed based on the light modulation constant current
The constant current output for number realizing LED, and completes the brightness regulation of LED.
Embodiment two
As shown in figure 3, the present embodiment provides the LED constant current control systems that one kind accurately dims, the difference with embodiment one
Place is, in the present embodiment, samples to ac input power.
Specifically, as shown in figure 3, the lamp controller 1 connects the input terminal of the constant flow module 2, to ac input power
Voltage sample is carried out, sampled voltage Vcs is obtained.Microprocessor 12 in the lamp controller 1 by the sampled voltage Vcs and is set
Value is compared, and the adjustment signal of the dim signal is generated according to the difference of the voltage sampling signal Vcs and setting value.Institute
Stating setting value can be set as needed, and in the present embodiment, the setting value is the ideal value of the ac input power.
Structure, connection relationship and the working principle of other units are the same as example 1, and will not repeat them here.
Embodiment three
As shown in figure 4, the present embodiment provides the LED constant current control method that one kind accurately dims, the LED accurately dimmed
Constant current control method includes at least:
Step S1: current constant control and preliminary brightness adjustment control are carried out to LED light source based on Background control instruction.
Specifically, the narrowband internet-of-things terminal mould group 13 obtains control instruction, in the present embodiment, the control from backstage
System instruction is for generating dim signal.The control instruction is transferred to the microprocessor 12, and the microprocessor 12 is controlled accordingly
It makes the LED drive unit 11 and exports dim signal, the constant flow module 2 receives the dim signal and AC power source, and produces
Raw light modulation constant current signal, the LED lamp source realize constant current output and preliminary light modulation control under the control of the light modulation constant current signal
System.In the present embodiment, the dim signal is pulse width modulating signal (PWM).
Step S2: sampling the output power of ac input power or LED light source, will the obtained sampled value of sampling with
Setting value is compared.
Specifically, the lamp controller 1 receives the sampling letter of the output power of the ac input power or the LED light source
Number, and the sampled signal is compared with setting value.The sampled signal be current signal or voltage signal, herein not one by one
It limits.In the present embodiment, if sampling to the ac input power, the setting value is the reason of the ac input power
Want to be worth；If the output power to the LED light source samples, the setting value is the ideal of the output power of the LED light source
Value.Step S2 real-time perfoming, to ensure accurate light modulation in real time.
Step S3: if there are deviations for sampled value and setting value, being finely adjusted the dim signal according to deviation, and
The LED light source 3 is dimmed with the dim signal after finely tuning, then return step S2；If sampled value is not deposited with setting value
Brightness adjustment control is then carried out to the LED light source 3 with current dim signal in deviation.
Specifically, if adjustment amount is obtained by calculation there are deviation in the sampled value and the setting value, and with institute
It states adjustment amount to be finely adjusted the dim signal, in the present embodiment, trim process is realized using pid algorithm.After fine tuning
Dim signal the light modulation constant current signal is adjusted, to realize constant current and brightness adjustment control to the LED lamp source 3.So
The output power of the ac input power or the LED light source is sampled again afterwards, is finely adjusted directly according to sampled value
Output power to the ac input power or the LED light source reaches ideal value.
Specifically, if deviation is not present in the sampled value and the setting value, the dim signal is not adjusted
It is whole.
The LED constant current control system accurately dimmed and method of the invention passes through to ac input power or LED light source
Output power is accurately sampled, and the data after sampling are compared according to dimmer command, are adjusted, to ensure controlled tune
Optical power value meets control and requires；The LED constant current control system accurately dimmed of the invention and method can use different factories
Accurate light modulation is realized in the case where family's product, practicability is high.
In conclusion the present invention provides a kind of LED constant current control system and method accurately dimmed, comprising: lamp controller, perseverance
Flow module, LED light source；The lamp controller receives AC power source, and connects the input of the constant flow module or the LED light source
End provides AC power source for the constant flow module, and generates phase according to the input signal of the constant flow module or the LED light source
The dim signal answered；The constant flow module is connected to the output end of the lamp controller, and the AC power source is converted to electric current letter
Number, and the current signal is adjusted based on the dim signal, to obtain light modulation constant current signal；The LED light source connects
It is connected to the output end of the constant flow module, the constant current output of LED is realized based on the light modulation constant current signal, and complete the bright of LED
Degree is adjusted.Current constant control and preliminary brightness adjustment control are carried out to LED light source based on Background control instruction；To ac input power or
The output power of LED light source is sampled, and the sampled value that sampling obtains is compared with setting value；Deviation if it exists, then root
The dim signal is finely adjusted according to deviation, and the LED light source is dimmed with the dim signal after finely tuning, then
Again multilevel iudge；Deviation then carries out brightness adjustment control to the LED light source with current dim signal if it does not exist.Essence of the invention
The LED constant current control system and method really dimmed is accurately adopted by the output power to ac input power or LED light source
Sample, and the data after sampling are compared according to dimmer command, are adjusted, the dimmed power value to ensure controlled meets control and wants
It asks；The LED constant current control system accurately dimmed of the invention and method can be realized using different manufacturers product
Accurate light modulation.So the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (10)
1. the LED constant current control system that one kind accurately dims, which is characterized in that the LED constant current control system accurately dimmed
It includes at least:
Lamp controller, constant flow module, LED light source；
The lamp controller receives AC power source, and connects the input terminal of the constant flow module or the LED light source, is the constant current
Module provides AC power source, and generates corresponding dim signal according to the input signal of the constant flow module or the LED light source；
The constant flow module is connected to the output end of the lamp controller, the AC power source is converted to current signal, and be based on
The dim signal is adjusted the current signal, to obtain light modulation constant current signal；
The LED light source is connected to the output end of the constant flow module, realizes that the constant current of LED is defeated based on the light modulation constant current signal
Out, and the brightness regulation of LED is completed.
2. the LED constant current control system according to claim 1 accurately dimmed, it is characterised in that: the lamp controller includes
LED drive unit, microprocessor, identity recognizing unit and narrowband internet-of-things terminal mould group；
The LED drive unit connects the microprocessor, is generated the dim signal by the control of the microprocessor；
The microprocessor receives the input signal of the constant flow module or the LED light source, to the constant flow module or described
The input signal of LED light source is sampled and generates corresponding adjustment signal；
The identity recognizing unit connects the narrowband internet-of-things terminal mould group, carries out body for the narrowband internet-of-things terminal mould group
Part identification；
The narrowband internet-of-things terminal mould group is connected to the microprocessor, to the signal for needing to receive and dispatch in the microprocessor into
Row wireless transmission.
3. the LED constant current control system according to claim 2 accurately dimmed, it is characterised in that: the identification list
Member is set to the internal or external of the microprocessor.
4. the LED constant current control system according to claim 2 or 3 accurately dimmed, it is characterised in that: the identification
Unit include applied to general grouped wireless network SIM card, applied to based on cellular protenchyma intranet network SIM card or
SIM card applied to enhancing machine type communication network.
5. the LED constant current control system according to claim 2 accurately dimmed, it is characterised in that: the narrowband Internet of Things
Terminal mould group include radio frequency unit, Power Management Unit and simulation digital baseband unit.
6. the LED constant current control method that one kind accurately dims, which is characterized in that the LED constant current control method accurately dimmed
It includes at least:
Step S1: current constant control and preliminary brightness adjustment control are carried out to LED light source based on Background control instruction；
Step S2: sampling the output power of ac input power or LED light source, the sampled value and setting that sampling is obtained
Value is compared；
Step S3: deviation if it exists is then finely adjusted the dim signal according to deviation, and with the dim signal after fine tuning
The LED light source is dimmed, then return step S2；Deviation is then with current dim signal to the LED light if it does not exist
Source carries out brightness adjustment control.
7. the LED constant current control method according to claim 6 accurately dimmed, it is characterised in that: the setting value is institute
State the ideal value of the output power of ac input power or LED light source.
8. the LED constant current control method according to claim 6 accurately dimmed, it is characterised in that: inputted to the exchange
The method of the output power of power or LED light source sampling includes current sample or voltage sample.
9. the LED constant current control method according to claim 6 accurately dimmed, it is characterised in that: the dim signal
Trim process is realized by pid algorithm.
10. the LED constant current control method according to claim 6 accurately dimmed, it is characterised in that: the dim signal is
Pulse width modulating signal.
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| CN102300355A (en) * | 2010-06-25 | 2011-12-28 | 英飞特电子（杭州）有限公司 | Light emitting diode (LED) dimming system |
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| KR20130135420A (en) * | 2012-06-01 | 2013-12-11 | (주)플로우테크 | A power apparatus for lighting led |
| KR101468512B1 (en) * | 2014-06-03 | 2014-12-03 | 하태복 | Switching mode power supply apparatus having linear variable dimming |
| CN105491734A (en) * | 2014-09-15 | 2016-04-13 | 上海俪德照明科技股份有限公司 | LED single-segment constant-current light-modulation drive circuit and method |
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| CN205611004U (en) * | 2016-05-17 | 2016-09-28 | 陕西科技大学 | Intelligence LED device of adjusting luminance |
| CN207427514U (en) * | 2017-09-12 | 2018-05-29 | 上海产业技术研究院 | A kind of LED constant current control system accurately dimmed |
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