CN205961512U - LED light modulator and LED drive arrangement - Google Patents
LED light modulator and LED drive arrangement Download PDFInfo
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- CN205961512U CN205961512U CN201620781689.0U CN201620781689U CN205961512U CN 205961512 U CN205961512 U CN 205961512U CN 201620781689 U CN201620781689 U CN 201620781689U CN 205961512 U CN205961512 U CN 205961512U
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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, cycle detection module obtains to be used for signifying the periodic signal in AC input voltage cycle according to continuous zero -crossing detection signal, the time delay module for produce the enabling signal according to zero -crossing detection signal and periodic signal, the lighting dimming data generator for produce pulse signal according to the enabling signal, and modulator for superpose AC input voltage and a plurality of pulse signal mutually, thereby produce power line carrier signals, with the luminance and/or the colour of control LED lamp. The light modulator adopts the modulation of time delay module control signal constantly, and LED drive arrangement adopts the reference voltage control signal decoupling zero constantly to can be so that LED dimming system can be applicable to different commercial power standards.
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.The solution that the signal modulation carrying out at light modulator end controls and carries out in LED drive end
Coupling controls, consistent with the cycle of AC-input voltage, such that it is able to AC-input voltage is used for transmission light modulation data-signal.
However, because the civil power standard in every country or area is different, the amplitude of AC-input voltage can for 110V or
220V, frequency can be 50Hz or 60Hz, and existing LED light adjusting system only can be suitably used for country or the ground of specific civil power standard
Area, thus needing for country variant or the different LED light adjusting systems of area design, lead to the cost of chip manufacturer increase with
And user is using inconvenience.
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, adopts at light modulator end
Modulate the moment with time delay module control signal, adopt reference voltage control signal to decouple the moment at LED drive device end, thus can
So that LED light adjusting system goes for different civil power standards.
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 pulse signal according to enabling signal；And modulator, for by AC-input voltage and multiple pulse signals
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；Cycle detection module, obtains the week for characterizing the AC-input voltage cycle according to continuous zero passage detection signal
Phase signal；And time delay module, for according to zero passage detection signal and periodic signal, entering line delay to produce enabling signal, with
LED dimmer is made to be applied to different civil power standards.
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, the described scheduled time in the range of 3/8*T0～7/16*T0, wherein T0 be AC-input voltage week
Phase.
Preferably, described pulse signal utilizes level to characterize 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；Enable module, enable signal for producing according to DC bus-bar voltage, so that
Obtain LED dimmer and be applied to different civil power standards；Decoupling module, for working under the control enabling signal, female from direct current
Line voltage obtains power carrier signal, and decodes light modulation data-signal；Control module, for producing according to light modulation data-signal
Raw control signal, thus adjusting output voltage and/or the electric current of power conversion module, wherein, described LED drive device detects arteries and veins
Rush signal, to realize the uneoupled control of power carrier signal.
Preferably, described power conversion module is flyback power converter.
Preferably, described decoupling module includes：High-pass filter, for obtaining high-frequency signal from DC bus-bar voltage；With
And second comparator, for described high-frequency signal is compared with reference voltage, to produce described light modulation data-signal.
Preferably, described enable module includes：First comparator, for by DC bus-bar voltage compared with reference voltage
Relatively, to provide enable signal.
Preferably, described enable module includes：No-voltage detection module, for detect DC bus-bar voltage no-voltage when
Carve, to produce no-voltage detection signal；And time delay module, produce for delay scheduled time after the no-voltage moment and enable
Signal.
Preferably, wherein T0 is AC-input voltage for example in the range of 1/4*T0～3/8*T0 the described scheduled time
Cycle.
Preferably, described enable module includes：First comparator, for by DC bus-bar voltage compared with reference voltage
Relatively, to produce the first control signal；No-voltage detection module, for detecting the no-voltage moment of DC bus-bar voltage, to produce
No-voltage detection signal；Time delay module, produces the second control signal for delay scheduled time after the no-voltage moment；And
Gate, used generation according to the first control signal and the second control signal enables signal.
Preferably, wherein T0 is AC-input voltage for example in the range of 1/4*T0～3/8*T0 the described scheduled time
Cycle.
According to the third aspect of the present utility model, provide a kind of LED light-dimming method, including：Produce enabling signal；Produce week
Phase signal；Pulse signal is produced according to enabling signal and periodic signal；And by AC-input voltage and multiple pulse signal phases
Superposition, thus producing power carrier signal, 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 line delay is entered to produce enabling signal according to zero passage detection signal, thus it is applied to different civil power standards.
Preferably, produce periodic signal to include：Obtained for characterizing exchange input electricity according to continuous zero passage detection signal
The periodic signal in pressure cycle.
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, the described scheduled time in the range of 3/8*T0～7/16*T0, wherein T0 be AC-input voltage week
Phase.
Preferably, described pulse signal utilizes level to characterize 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；Generation makes
Can signal；According to enabling signal, obtain power carrier signal from DC bus-bar voltage, and decode light modulation data-signal；Root
Produce control signal according to light modulation data-signal；And according to described control signal adjust power conversion module output voltage and/
Or electric current, thus control brightness and/or the colour temperature of LED.
Preferably, produce enable signal to include：DC bus-bar voltage is compared with reference voltage, enables letter to provide
Number, thus being applied to different civil power standards.
Preferably, produce enable signal to include：The no-voltage moment of detection DC bus-bar voltage, to produce no-voltage detection
Signal；And delay scheduled time produces enable signal after the no-voltage moment.
Preferably, produce enable signal to include：DC bus-bar voltage is compared with reference voltage, to provide the first control
Signal；The no-voltage moment of detection DC bus-bar voltage, to produce no-voltage detection signal；Postpone pre- after the no-voltage moment
Fix time and produce the second control signal；And the first control signal and the second control signal are carried out and computing, to produce enable
Signal.
According to the LED light adjusting system of the utility model embodiment, time delay module control signal is adopted to modulate at light modulator end
In the moment, reference voltage control signal is adopted to decouple the moment at LED drive device end.In each half power frequency period close to end
Time period detection pulse signal, to realize the uneoupled control of power carrier signal.Therefore, LED drive device need not be using multiple
Miscellaneous data resolution module parsing light modulation data-signal, such that it is able to reduce circuit cost.
Reference voltage is arranged due to nominal value and the undulating value of the amplitude according to AC-input voltage and frequency, therefore,
This LED light adjusting system goes for the country of different civil power standards, thus can set for country variant or area
Count general LED light adjusting system, thus reducing the cost of chip manufacturer and user-friendly.
Further, because, within the of short duration time close to end in each half power frequency period, AC-input voltage is used
In transmission signal, within most of the time, it is light modulator that AC-input voltage is used for and LED drive device is powered.Thus, should
LED light adjusting system can mitigate the interference to carrier signal transmission for the power supply, thus improving the reliability of circuit.
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 first embodiment；
Fig. 3 illustrates the schematic block diagram of the LED light adjusting system according to the utility model first embodiment；And
Fig. 4 illustrates the schematic block diagram of the LED light adjusting system according to the utility model first 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 first 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.
Different from the LED light adjusting system of the prior art shown in Fig. 1, the LED according to the utility model first embodiment adjusts
Light modulator 210 in photosystem signal modulation in each half power frequency period produces power carrier signal.For this reason, light modulator 210
Including zero passage detection module 211, cycle detection module 215, 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 cycle), 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.
Cycle detection module 215 receives zero passage detection signal, is obtained according to continuous zero passage detection signal and hands over for characterizing
The periodic signal in stream input voltage cycle.
Time delay module 212 receives zero passage detection signal and periodic signal, and produces enabling signal.After zero-acrross ing moment
Delay scheduled time Δ t.After each half power frequency period, moment after the peak value of AC-input voltage or valley, start
Signal is transformed into effective status from disarmed state.For example, this scheduled time Δ t is 3/8*T0～7/16*T0.Preferably, this when
Carve the sinusoidal waveform being located at AC-input voltage near the position of zero passage, correspondingly, this scheduled time, Δ t was about 7/16*
T0.In this embodiment, light modulator 210, as transmitting terminal, carries out signal modulation before each half power frequency period terminates.Even if
Under different civil power standards, alternating current input voltage magnitude and/or frequency are different, or the amplitude of AC-input voltage or frequency fluctuation,
LED drive device 220, as receiving terminal, all can capture power carrier signal.
Light modulation number generator 213 receives enabling signal, and when enabling signal is effective, light modulation number generator 213 provides
Pulse signal.This pulse signal utilizes level to characterize digital value, and such as high level characterizes digital " 1 ", and low level characterizes numeral
“0”.
Modulator 214 is superimposed with AC-input voltage by pulse signal, thus producing power carrier signal.This electric power carries
Ripple signal is, for example, the sine wave of amplitude modulation in each half work cycle.
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, control module 224 and
Comparator 225.
Rectifier bridge 211 is, for example, full bridge rectifier, obtains AC-input voltage from utility grid, obtains straight through over commutation
Stream busbar voltage Vbus.Described DC bus-bar voltage Vbus is, for example, the DC pulse moving voltage of half power frequency period.
Power conversion module 222 for example, comprises inverse-excitation type (FLY-BACK) power inverter of main switch, by direct current
Busbar voltage Vbus is converted further into VD.
The in-phase input end of comparator 225 receives DC bus-bar voltage Vbus, and inverting input receives reference voltage Vref,
Output end provides and enables signal EN.Reference voltage Vref can be according to the nominal value of the amplitude of AC-input voltage and frequency and ripple
Move value and determine.
In this embodiment, reference voltage selects for example in the range of 80V-100V, to adapt to every country or area
City's electric standard.In a preferred embodiment, for the AC-input voltage of 220V, reference voltage is, for example, 150V, for 120V
AC-input voltage, reference voltage is, for example, 100V, to adapt to amplitude and the frequency fluctuation of AC-input voltage.
This decoupling module 223 receives DC bus-bar voltage Vbus and enables signal EN.When enable signal EN is effective, decoupling
Module 223 works.Decoupling module 223 for example includes high-pass filter and comparator.High-pass filter is from DC bus-bar voltage
Vbus obtains high-frequency signal.Described high-frequency signal is compared by comparator with reference voltage, to produce described light modulation data-signal.
Control module 224 produces control signal, such as pulse-width signal further according to light modulation data-signal.Power turns
Die change block 222 adjusts output voltage and/or electric current under control of the control signal.Due to the change of output voltage and/or electric current,
The brightness of LED, color change, thus realizing dimming.
Fig. 3 illustrates the schematic block diagram of the LED light adjusting system according to the utility model second embodiment.
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.
Similar with the LED light adjusting system according to the utility model first embodiment shown in Fig. 2, this LED light adjusting system bag
Include light modulator 210, LED drive device 220 and LED 230.Light modulator 210 as master controller, for the operation according to user
Produce power carrier signal, LED drive device 220, as from controller, is supplied to LED for controlling according to power carrier signal
The VD of lamp 230.
Different from the LED light adjusting system according to the utility model first embodiment shown in Fig. 2, LED drive device 220 is wrapped
Include rectifier bridge 211, power conversion module 222, decoupling module 223, control module 224, no-voltage detection module 226 and time delay mould
Block 227.
Rectifier bridge 211 is, for example, full bridge rectifier, obtains AC-input voltage from utility grid, obtains straight through over commutation
Stream busbar voltage Vbus.
Power conversion module 222 for example, comprises inverse-excitation type (FLY-BACK) power inverter of main switch, by direct current
Busbar voltage Vbus is converted further into VD.
No-voltage detection module 226 is directed to DC bus-bar voltage Vbus, and detection is when positive electricity is depressed into the no-voltage of no-voltage
Carve t1, and produce no-voltage detection signal.
Time delay module 227 receives no-voltage detection signal, delay scheduled time Δ t after the no-voltage moment, and generation makes
Can signal EN.After each half power frequency period, moment after the peak value of DC bus-bar voltage, enable signal EN from invalid shape
State is transformed into effective status.Scheduled time Δ t can be according to the nominal value of the amplitude of AC-input voltage and frequency and undulating value
And determine.
In this embodiment, scheduled time Δ t selects for example in the range of 1/4*T0～3/8*T0, with adapt to every country or
City's electric standard in area, and adapt to amplitude and the frequency fluctuation of AC-input voltage.Preferably, this moment is located at dc bus
Near the position of voltage peak, correspondingly, this scheduled time Δ t is about 1/4*T0.
This decoupling module 223 receives DC bus-bar voltage Vbus and enables signal EN.When enable signal EN is effective, decoupling
Module 223 works.Decoupling module 223 for example includes high-pass filter and comparator.High-pass filter is from DC bus-bar voltage
Vbus obtains high-frequency signal.Described high-frequency signal is compared by comparator with reference voltage, to produce described light modulation data-signal.
Control module 224 produces control signal, such as pulse-width signal further according to light modulation data-signal.Power turns
Die change block 222 adjusts output voltage and/or electric current under control of the control signal.Due to the change of output voltage and/or electric current,
The brightness of LED, color change, thus realizing dimming.
In this embodiment, light modulator 210, as transmitting terminal, carries out signal modulation before each half power frequency period terminates.
Even if alternating current input voltage magnitude and/or frequency are different under different civil power standards, or the amplitude of AC-input voltage or frequency
Rate fluctuates, and LED drive device 220, as receiving terminal, all can capture power carrier signal.
Fig. 4 illustrates the schematic block diagram of the LED light adjusting system according to the utility model 3rd embodiment.
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.
Similar with the LED light adjusting system according to the utility model first embodiment shown in Fig. 2, this LED light adjusting system bag
Include light modulator 210, LED drive device 220 and LED 230.Light modulator 210 as master controller, for the operation according to user
Produce power carrier signal, LED drive device 220, as from controller, is supplied to LED for controlling according to power carrier signal
The VD of lamp 230.
Different from the LED light adjusting system according to the utility model first embodiment shown in Fig. 2, LED drive device 220 is wrapped
Include rectifier bridge 211, power conversion module 222, decoupling module 223, control module 224, comparator 225, no-voltage detection module
226th, time delay module 227 and with door 228.
Rectifier bridge 211 is, for example, full bridge rectifier, obtains AC-input voltage from utility grid, obtains straight through over commutation
Stream busbar voltage Vbus.
Power conversion module 222 for example, comprises inverse-excitation type (FLY-BACK) power inverter of main switch, by direct current
Busbar voltage Vbus is converted further into VD.
The in-phase input end of comparator 225 receives DC bus-bar voltage Vbus, and inverting input receives reference voltage Vref,
Output end provides the first control signal.Reference voltage Vref can according to the nominal value of the amplitude of AC-input voltage and frequency and
Undulating value and determine.
In this embodiment, reference voltage selects for example in the range of 80V-100V, to adapt to every country or area
City's electric standard.In a preferred embodiment, for the AC-input voltage of 220V, reference voltage is, for example, 150V, for 120V
AC-input voltage, reference voltage is, for example, 100V, to adapt to amplitude and the frequency fluctuation of AC-input voltage.
No-voltage detection module 226 is directed to DC bus-bar voltage Vbus, and detection is when positive electricity is depressed into the no-voltage of no-voltage
Carve t1, and produce no-voltage detection signal.
Time delay module 227 receives no-voltage detection signal, delay scheduled time Δ t after the no-voltage moment, produces the
Two control signals.After each half power frequency period, moment second control signal after the peak value of DC bus-bar voltage is from no
Effect state is transformed into effective status.Scheduled time Δ t can be according to the nominal value of the amplitude of AC-input voltage and frequency and ripple
Move value and determine.
In this embodiment, scheduled time Δ t selects for example in the range of 1/4*T0～3/8*T0, with adapt to every country or
City's electric standard in area, and adapt to amplitude and the frequency fluctuation of AC-input voltage.Preferably, this moment is located at dc bus
Near the position of voltage peak, correspondingly, this scheduled time Δ t is about 1/4*T0.
Receive the first control signal and the second control signal with the first input end of door 228 and the second input respectively, defeated
Going out end provides enable signal EN.In alternate embodiments, identical function can be realized using arbitrary gate.
This decoupling module 223 receives DC bus-bar voltage Vbus and enables signal EN.When enable signal EN is effective, decoupling
Module 223 works.Decoupling module 223 for example includes high-pass filter and comparator.High-pass filter is from DC bus-bar voltage
Vbus obtains high-frequency signal.Described high-frequency signal is compared by comparator with reference voltage, to produce described light modulation data-signal.
Control module 224 produces control signal, such as pulse-width signal further according to light modulation data-signal.Power turns
Die change block 222 adjusts output voltage and/or electric current under control of the control signal.Due to the change of output voltage and/or electric current,
The brightness of LED, color change, thus realizing dimming.
In this embodiment, light modulator 210, as transmitting terminal, carries out signal modulation before each half power frequency period terminates.
Even if alternating current input voltage magnitude and/or frequency are different under different civil power standards, or the amplitude of AC-input voltage or frequency
Rate fluctuates, and LED drive device 220, as receiving terminal, all can capture power carrier signal.
According to the LED light adjusting system of the utility model embodiment, detect the exchange input electricity of utility grid at light modulator end
In the pressure cycle, the moment is modulated using time delay module control signal.In each half power frequency period, electric power is produced using signal modulation and carries
Ripple signal, in continuously multiple half power frequency periods, transmission light modulation data-signal.In a preferred embodiment, light modulator conduct
Transmitting terminal, carries out signal modulation, LED drive device, as receiving terminal, can easily be caught before each half power frequency period terminates
Receive power carrier signal.
Light modulator 210 adopts zero passage detection module, cycle detection module and time delay module, you can to realize power carrier letter
Number modulation control.Therefore, light modulator 210 need not be using special power line carrier, PLC chip, for example, low voltage power line carrier
Communication chip PL3106, such that it is able to reduce circuit cost.
Time period detection pulse signal close to end in each half power frequency period for the LED drive device 220, to realize
The uneoupled control of power carrier signal.Therefore, LED drive device 220 need not be using complicated data resolution module parsing light modulation
Data-signal, such that it is able to reduce circuit cost.
Further, due to adopting signal modulation, within the of short duration time close to end in each half power frequency period, hand over
Stream input voltage is used for transmission signal, and within most of the time, AC-input voltage is used for as light modulator and LED drive device
Power supply.Thus, this LED light adjusting system can mitigate the interference to carrier signal transmission for the power supply, thus improving the reliability of circuit.
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 (15)
1. a kind of LED dimmer is it is characterised in that include：
Light modulation number generator, for producing pulse signal according to enabling signal；And
Modulator, is connected with light modulation number generator, for will be superimposed with multiple pulse signals for AC-input voltage, thus
Produce 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；
Cycle detection module, is connected with zero passage detection module, is obtained for characterizing exchange according to continuous zero passage detection signal
The periodic signal in input voltage cycle；And
Time delay module, is connected with zero passage detection module, for according to zero passage detection signal and periodic signal, entering line delay to produce
Raw enabling signal, so that LED dimmer is applied to different civil power standards.
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 3/8*T0～7/16*T0's
In the range of, wherein T0 is the cycle of AC-input voltage.
6. LED dimmer according to claim 2 is it is characterised in that described pulse signal utilizes level to characterize digital value.
7. LED dimmer according to claim 2 is it is characterised in that described modulator carries out amplitude modulation.
8. 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；
Enable module, be connected with rectifier bridge, enable signal for producing according to DC bus-bar voltage, so that LED dimmer
It is applied to different civil power standards；
Decoupling module, is connected with rectifier bridge and enable module, for working under the control enabling signal, from dc bus electricity
Pressure obtains power carrier signal, 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 pulse signal, to realize the uneoupled control of power carrier signal.
9. LED drive device according to claim 8 is it is characterised in that described power conversion module is flyback power
Converter.
10. LED drive device according to claim 8 is it is characterised in that described decoupling module includes：
High-pass filter, for obtaining high-frequency signal from DC bus-bar voltage；And
Second comparator, is connected with high-pass filter, for described high-frequency signal is compared with reference voltage, to produce
State light modulation data-signal.
11. LED drive device according to claim 8 are it is characterised in that described enable module includes：
First comparator, for DC bus-bar voltage is compared with reference voltage, to provide enable signal.
12. LED drive device according to claim 8 are it is characterised in that described enable module includes：
No-voltage detection module, for detecting the no-voltage moment of DC bus-bar voltage, to produce no-voltage detection signal；And
Time delay module, is connected with no-voltage detection module, produces for delay scheduled time after the no-voltage moment and enables
Signal.
13. LED drive device according to claim 12 it is characterised in that the described scheduled time for example 1/4*T0～
In the range of 3/8*T0, wherein T0 is the cycle of AC-input voltage.
14. LED drive device according to claim 8 are it is characterised in that described enable module includes：
First comparator, for DC bus-bar voltage is compared with reference voltage, to produce the first control signal；
No-voltage detection module, for detecting the no-voltage moment of DC bus-bar voltage, to produce no-voltage detection signal；
Time delay module, is connected with no-voltage detection module, produces second for delay scheduled time after the no-voltage moment
Control signal；And
Gate, is connected with first comparator and time delay module, used is produced according to the first control signal and the second control signal
Raw enable signal.
15. LED drive device according to claim 14 it is characterised in that the described scheduled time for example 1/4*T0～
In the range of 3/8*T0, wherein T0 is the cycle of AC-input voltage.
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| CN201620781689.0U CN205961512U (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 |
|---|---|---|---|---|
| CN106102245A (en) * | 2016-07-20 | 2016-11-09 | 杭州士兰微电子股份有限公司 | LED dimmer, LED light-dimming method and LED drive device |
| CN111194119A (en) * | 2020-03-10 | 2020-05-22 | 帝奥微电子有限公司 | LED driving circuit and method capable of being controlled by switching and dimming |
| CN111405715A (en) * | 2020-04-03 | 2020-07-10 | 宁波科尔维特照明有限公司 | Silicon controlled rectifier dimming system and dimming method thereof |
-
2016
- 2016-07-20 CN CN201620781689.0U patent/CN205961512U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102245A (en) * | 2016-07-20 | 2016-11-09 | 杭州士兰微电子股份有限公司 | LED dimmer, LED light-dimming method and LED drive device |
| CN106102245B (en) * | 2016-07-20 | 2019-02-12 | 杭州士兰微电子股份有限公司 | LED dimmer, LED light-dimming method and LED drive device |
| CN111194119A (en) * | 2020-03-10 | 2020-05-22 | 帝奥微电子有限公司 | LED driving circuit and method capable of being controlled by switching and dimming |
| CN111405715A (en) * | 2020-04-03 | 2020-07-10 | 宁波科尔维特照明有限公司 | Silicon controlled rectifier dimming system and dimming method thereof |
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