CN205961510U - LED light modulator and LED drive arrangement - Google Patents
LED light modulator and LED drive arrangement Download PDFInfo
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- CN205961510U CN205961510U CN201620770434.4U CN201620770434U CN205961510U CN 205961510 U CN205961510 U CN 205961510U CN 201620770434 U CN201620770434 U CN 201620770434U CN 205961510 U CN205961510 U CN 205961510U
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Abstract
The utility model discloses a LED light modulator and LED drive arrangement. The LED light modulator includes: zero -cross detection module for detection AC input voltage's zero -crossing time is in order to produce the zero -crossing detection signal, the time delay module for produce the enabling signal according to the zero -crossing detection signal, the lighting dimming data generator for produce single pulse signal according to the enabling signal, and modulator for superpose AC input voltage and single pulse signal mutually, thereby produce power line carrier signals, with the luminance and/or the colour of control LED lamp. This light modulator single pulse modulation in every half work frequency produces power line carrier signals to the circuit cost can be reduced and the reliability is improved.
Description
Technical field
The utility model is related to light source control technology, drives more particularly, to for the LED dimmer of LED and LED
Device.
Background technology
When light emitting diode (light-emitting diode, LED) is used for lighting field, using LED light modulating device
Adjust brightness to meet the individual demand of user or according to the light modulation of environment needs with reducing energy consumption.Using LED light modulating device
Brightness and the colour temperature of LED can be adjusted, to reach the demand of user.
LED light modulating device is for example with traditional controllable silicon dimmer.However, controllable silicon dimmer exists maintains electric current one
The problem that cause property differs, and the product of every country, each brand there is also difference, asking of light modulator compatibility easily
Topic.Additionally, there is also the phenomenons such as flicker in dimming process.Further improved LED light modulating device adopts power modulus of conversion
Block provides VD, realizes light modulation by changing the electric current flowing through LED.Power conversion module is adapted to wide scope
Supply voltage and stable electric current is provided, and intelligent dimming can be realized, therefore be widely used.
Fig. 1 illustrates the schematic block diagram of the LED light adjusting system according to prior art.This LED light adjusting system includes light modulator
110th, LED drive device 120 and LED 130.Light modulator 110 is connected via Alternating Current Power Supply line with LED drive device 120.Adjust
Light device 110 produces power carrier signal according to the operation of user.LED 130, as the load of power conversion module, is connected to
Between two output ends of LED drive device 120.
LED drive device 120 includes rectifier bridge 111, power conversion module 122, decoupling module 123 and control module 124.
This rectifier bridge 111 obtains AC-input voltage from utility grid, and obtains DC bus-bar voltage through over commutation.Power modulus of conversion
DC bus-bar voltage is converted further into VD by block 122.Decoupling module 123 obtains electric power from DC bus-bar voltage
Carrier signal, and decode light modulation data-signal, control module 124 produces control letter further according to light modulation data-signal
Number.Power conversion module 122 adjusts output voltage and/or electric current under control of the control signal.Due to output voltage and/or electricity
The change of stream, the brightness of LED, color can change.
In this LED light adjusting system, light modulator and LED drive device are connected in series, and adopt public phase line and zero
Line is powered and is transmitted power carrier signal.Due to the power supply of modules and the demand of carrier signal transmission must be taken into account, because
This, the whether light modulator or circuit structure of LED drive device all complicates, leads to circuit cost to increase and reliability becomes
Difference.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of light modulator and LED drive device, in each half power frequency
In cycle, simple venation modulated produces power carrier signal, such that it is able to reducing circuit cost and improving reliability.
According to of the present utility model in a first aspect, providing a kind of LED dimmer it is characterised in that including：Light modulation data is sent out
Raw device, for producing single pulse signal according to enabling signal；And modulator, for by AC-input voltage and single pulse signal
Superimposed, thus producing power carrier signal, to control brightness and/or the color of LED.
Preferably, also include：Zero passage detection module, for detecting the zero-acrross ing moment of AC-input voltage, to produce zero passage
Detection signal；And time delay module, for enabling signal is produced according to zero passage detection signal.
Preferably, described zero passage detection module is used for detecting that described AC-input voltage is changed into negative voltage from positive voltage value
Value and the zero-acrross ing moment being changed at least one of positive voltage value from negative value.
Preferably, after zero-acrross ing moment, delay scheduled time, by described enabling signal from invalid shape for described time delay module
State is changed into effective status.
Preferably, wherein T0 is AC-input voltage in the range of 4/16*T0～7/16*T0 the described scheduled time
Cycle.
Preferably, substantially 3/8T0 of the described scheduled time.
Preferably, the level of described single pulse signal characterizes a digital value.
Preferably, described modulator carries out amplitude modulation.
According to second aspect of the present utility model, provide a kind of LED drive device it is characterised in that including：Rectifier bridge,
For by AC-input voltage rectification to obtain DC bus-bar voltage；Power conversion module, for producing according to DC bus-bar voltage
Raw VD, thus power for LED；Decoupling module, for obtaining power carrier signal from DC bus-bar voltage, and
And decode light modulation data-signal；Control module, for producing control signal according to light modulation data-signal, thus adjust power turn
The output voltage of die change block and/or electric current, wherein, described LED drive device detects single pulse signal, to realize power carrier letter
Number uneoupled control.
Preferably, described power conversion module is flyback power converter.
Preferably, described decoupling module includes：Peak detection circuit, for detecting the peak value of DC bus-bar voltage, wherein
Described LED drive device, after peak value is detected, detects described single pulse signal further.
Preferably, described decoupling module includes：High-pass filter, for obtaining high-frequency signal from DC bus-bar voltage；With
And comparator, for described high-frequency signal is compared with reference voltage, to produce described light modulation data-signal.
According to the third aspect of the present utility model, provide a kind of LED light-dimming method, including：Produce enabling signal；According to opening
Dynamic signal produces single pulse signal；And AC-input voltage is superimposed with single pulse signal, thus produce power carrier letter
Number, to control brightness and/or the color of LED.
Preferably, produce enabling signal to include：The zero-acrross ing moment of detection AC-input voltage, to produce zero passage detection letter
Number；And enabling signal is produced according to zero passage detection signal.
Preferably, the zero-acrross ing moment of detection AC-input voltage includes：Detect described AC-input voltage from positive voltage value
The zero-acrross ing moment being changed into negative value and being changed at least one of positive voltage value from negative value.
Preferably, after zero-acrross ing moment, delay scheduled time, described enabling signal is changed into effectively from disarmed state
State.
Preferably, wherein T0 is AC-input voltage in the range of 4/16*T0～7/16*T0 the described scheduled time
Cycle.
Preferably, substantially 3/8T0 of the described scheduled time.
Preferably, the level of described single pulse signal characterizes a digital value.
Preferably, by amplitude modulation, produce power carrier signal.
Preferably, also include：VD is produced according to DC bus-bar voltage, thus powering for LED；From direct current
Busbar voltage obtains power carrier signal, and decodes light modulation data-signal；Control signal is produced according to light modulation data-signal；
And the output voltage according to described control signal regulation power conversion module and/or electric current, thus controlling the brightness of LED
And/or colour temperature.
According to the LED drive device of the utility model embodiment, using peak detection circuit, at the peak of DC bus-bar voltage
Single pulse signal is detected, you can to realize the uneoupled control of power carrier signal after value.Therefore, LED drive device need not be adopted
With complicated data resolution module parsing light modulation data-signal, such that it is able to reduce circuit cost.
Further, due to using simple venation modulated, the only one single pulse width in each half power frequency period short
Temporarily interior, AC-input voltage is used for transmission signal, within most of the time, AC-input voltage be used for as light modulator and
LED drive device is powered.Thus, this LED light adjusting system can mitigate the interference to carrier signal transmission for the power supply, thus improving electricity
The reliability on road.
Brief description
By the description to the utility model embodiment referring to the drawings, of the present utility model above-mentioned and other mesh
, feature and advantage will be apparent from, in the accompanying drawings：
Fig. 1 illustrates the schematic block diagram of the LED light adjusting system according to prior art；
Fig. 2 illustrates the schematic block diagram of the LED light adjusting system according to the utility model embodiment.
Specific embodiment
It is more fully described the utility model hereinafter with reference to accompanying drawing.In various figures, identical element is using similar
Reference representing.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.Furthermore, it is possible to it is not shown
Some known parts.
Describe hereinafter many specific details of the present utility model, the structure of such as device, material, size, place
Science and engineering skill and technology, to be more clearly understood that the utility model.But just as the skilled person will understand,
The utility model can not be realized according to these specific details.
The utility model can present in a variety of manners, some of them example explained below.
Fig. 2 illustrates the schematic block diagram of the LED light adjusting system according to the utility model embodiment.
This LED light adjusting system includes light modulator 210, LED drive device 220 and LED 230.Light modulator 210 is as master control
Device processed, for power carrier signal is produced according to the operation of user, LED drive device 220 as from controller, for according to electricity
Power carrier signal controls the VD being supplied to LED 230.
Light modulator 210 is connected via Alternating Current Power Supply line with LED drive device 220.For example, light modulator 210 connects to city
The phase line of electrical network.The first input end of LED drive device 220 connects to light modulator 210, and the second input connects to civil power electricity
The zero line of net.LED 230, as the load of power conversion module, is connected to first output end and of LED drive device 220
Between two output ends.
LED drive device 220 includes rectifier bridge 211, power conversion module 222, decoupling module 223 and control module 224.
Rectifier bridge 211 is, for example, full bridge rectifier, obtains AC-input voltage from utility grid, obtains straight through over commutation
Stream busbar voltage.Described DC bus-bar voltage is, for example, the DC pulse moving voltage of half power frequency period.Power conversion module 222 is for example
For comprising inverse-excitation type (FLY-BACK) power inverter of main switch, DC bus-bar voltage is converted further into direct current output
Voltage.
Decoupling module 223 for example includes high-pass filter and comparator.High-pass filter obtains height from DC bus-bar voltage
Frequency signal.Described high-frequency signal is compared by comparator with reference voltage, to produce described light modulation data-signal.Control module
224 produce control signal, such as pulse-width signal further according to light modulation data-signal.Power conversion module 222 is controlling
Output voltage and/or electric current is adjusted under the control of signal.
Due to the change of output voltage and/or electric current, the brightness of LED, color change, thus realizing dimming.
Different from the LED light adjusting system of the prior art shown in Fig. 1, according to the LED light modulation system of the utility model embodiment
Light modulator 210 in system simple venation modulated in each half power frequency period produces power carrier signal.For this reason, light modulator 210 wraps
Include zero passage detection module 211, time delay module 212, light modulation number generator 213 and modulator 214.
The input of light modulator 210 connects to phase line, and output end connects to LED drive device 220, such that it is able to via electricity
Line of force transmission light modulation data-signal.Light modulator 210 receives AC-input voltage, and the frequency of this AC-input voltage is, for example, 50Hz
(0.02 second cycle) or 60Hz (0.017 second), the corresponding cycle is T0.
Zero passage detection module 211 is directed to AC-input voltage, and detection is from negative value to positive voltage value or from positive voltage
It is worth to the zero-acrross ing moment t0 of negative value, and produce zero passage detection signal.
Time delay module 212 receives zero passage detection signal and produces enabling signal.Postpone pre- timing after zero-acrross ing moment
Between Δ t.After each half power frequency period, moment after the peak value of AC-input voltage or valley, enabling signal is from invalid
State is transformed into effective status.For example, this scheduled time Δ t is 4/16*T0～7/16*T0.Preferably, this moment is located at exchange
Near the position of sinusoidal waveform halfwidth of input voltage, correspondingly, this scheduled time Δ t is about 3/8*T0.
Light modulation number generator 213 receives enabling signal, and when enabling signal is effective, light modulation number generator 213 provides
Single pulse signal.The level of this single pulse signal characterizes a digital value, and such as high level characterizes digital " 1 ", and low level characterizes
Digital " 0 ".
Modulator 214 is superimposed with AC-input voltage by single pulse signal, thus producing power carrier signal.This electric power
Carrier signal is, for example, the sine wave of of short duration amplitude modulation in each half work cycle.
According to the LED light adjusting system of the utility model embodiment, in each half power frequency period, produced using simple venation modulated
Raw power carrier signal, in continuously multiple half power frequency periods, transmission light modulation data-signal by turn.
Light modulator 210 adopts zero passage detection module and time delay module, you can to realize the modulation control of power carrier signal.
Therefore, light modulator 210 need not be using special power line carrier, PLC chip, for example, low-voltage powerline carrier communication chip
PL3106, such that it is able to reduce circuit cost.
LED drive device 220 adopts peak detection circuit, detection pulse letter after the peak value of DC bus-bar voltage
Number, you can to realize the uneoupled control of power carrier signal.Therefore, LED drive device 220 need not be using complicated data parsing
Module parsing light modulation data-signal, such that it is able to reduce circuit cost.
Further, due to using simple venation modulated, the only one single pulse width in each half power frequency period short
Temporarily interior, AC-input voltage is used for transmission signal, within most of the time, AC-input voltage be used for as light modulator and
LED drive device is powered.Thus, this LED light adjusting system can mitigate the interference to carrier signal transmission for the power supply, thus improving electricity
The reliability on road.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation are made a distinction with another entity or operation, and not necessarily require or imply these entities or deposit between operating
In any this actual relation or order.And, term " inclusion ", "comprising" or its any other variant are intended to
Comprising of nonexcludability, wants so that including a series of process of key elements, method, article or equipment and not only including those
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element that limited by sentence "including a ..." it is not excluded that
Also there is other identical element including in the process of described key element, method, article or equipment.
According to embodiment of the present utility model as described above, these embodiments do not have all of details of detailed descriptionthe,
Do not limit the specific embodiment that this utility model is only described yet.Obviously, as described above, a lot of modifications and change can be made
Change.This specification is chosen and is specifically described these embodiments, is to preferably explain that principle of the present utility model and reality should
With so that skilled artisan can be well using the utility model and repairing on the basis of the utility model
Change use.The utility model is only limited by claims and its four corner and equivalent.
Claims (12)
1. a kind of LED dimmer is it is characterised in that include：
Light modulation number generator, for producing single pulse signal according to enabling signal；And
Modulator, is connected with light modulation number generator, for AC-input voltage is superimposed with single pulse signal, thus producing
Raw power carrier signal, to control brightness and/or the color of LED.
2. LED dimmer according to claim 1 is it is characterised in that also include：
Zero passage detection module, for detecting the zero-acrross ing moment of AC-input voltage, to produce zero passage detection signal；And
Time delay module, is connected with zero passage detection module, for producing enabling signal according to zero passage detection signal.
3. LED dimmer according to claim 2 is it is characterised in that described zero passage detection module is used for detecting described friendship
Stream input voltage is changed into negative value and the mistake being changed at least one of positive voltage value from negative value from positive voltage value
Zero moment.
4. LED dimmer according to claim 2, it is characterised in that described time delay module is after zero-acrross ing moment, postpones
The scheduled time, described enabling signal is changed into effective status from disarmed state.
5. LED dimmer according to claim 4 it is characterised in that the described scheduled time in 4/16*T0～7/16*T0
In the range of, wherein T0 is the cycle of AC-input voltage.
6. LED dimmer according to claim 5 is it is characterised in that substantially 3/8T0 of the described scheduled time.
7. LED dimmer according to claim 1 is it is characterised in that the level of described single pulse signal characterizes a number
Word value.
8. LED dimmer according to claim 1 is it is characterised in that described modulator carries out amplitude modulation.
9. a kind of LED drive device is it is characterised in that include：
Rectifier bridge, for by AC-input voltage rectification to obtain DC bus-bar voltage；
Power conversion module, is connected with rectifier bridge, for producing VD according to DC bus-bar voltage, thus being
LED is powered；
Decoupling module, is connected with rectifier bridge, for obtaining power carrier signal from DC bus-bar voltage, and decodes light modulation
Data-signal；
Control module, is connected with decoupling module, for producing control signal according to light modulation data-signal, thus adjust power turning
The output voltage of die change block and/or electric current,
Wherein, described LED drive device detects single pulse signal, to realize the uneoupled control of power carrier signal.
10. LED drive device according to claim 9 is it is characterised in that described power conversion module is flyback power
Converter.
11. LED drive device according to claim 9 are it is characterised in that described decoupling module includes：Peakvalue's checking electricity
Road, for detecting the peak value of DC bus-bar voltage, wherein said LED drive device, after peak value is detected, detects further
Described single pulse signal.
12. LED drive device according to claim 9 are it is characterised in that described decoupling module includes：
High-pass filter, for obtaining high-frequency signal from DC bus-bar voltage；And
Comparator, is connected with high-pass filter, for described high-frequency signal is compared with reference voltage, to produce described tune
Light data signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620770434.4U CN205961510U (en) | 2016-07-20 | 2016-07-20 | LED light modulator and LED drive arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620770434.4U CN205961510U (en) | 2016-07-20 | 2016-07-20 | LED light modulator and LED drive arrangement |
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| CN205961510U true CN205961510U (en) | 2017-02-15 |
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| CN201620770434.4U Active CN205961510U (en) | 2016-07-20 | 2016-07-20 | LED light modulator and LED drive arrangement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061041A (en) * | 2016-07-20 | 2016-10-26 | 杭州士兰微电子股份有限公司 | LED light modulator, LED light modulation method and LED driving device |
| CN106061042A (en) * | 2016-07-20 | 2016-10-26 | 杭州士兰微电子股份有限公司 | LED light modulator, LED light modulation panel, LED light modulation method and LED driving device |
| CN113759743A (en) * | 2021-09-26 | 2021-12-07 | 深圳市晟瑞科技有限公司 | Intelligent household control system |
-
2016
- 2016-07-20 CN CN201620770434.4U patent/CN205961510U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061041A (en) * | 2016-07-20 | 2016-10-26 | 杭州士兰微电子股份有限公司 | LED light modulator, LED light modulation method and LED driving device |
| CN106061042A (en) * | 2016-07-20 | 2016-10-26 | 杭州士兰微电子股份有限公司 | LED light modulator, LED light modulation panel, LED light modulation method and LED driving device |
| CN106061042B (en) * | 2016-07-20 | 2019-04-09 | 杭州士兰微电子股份有限公司 | LED dimmer, LED light modulation panel, LED light-dimming method and LED drive device |
| CN113759743A (en) * | 2021-09-26 | 2021-12-07 | 深圳市晟瑞科技有限公司 | Intelligent household control system |
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