CN106102245B - LED dimmer, LED light-dimming method and LED drive device - Google Patents
LED dimmer, LED light-dimming method and LED drive device Download PDFInfo
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- CN106102245B CN106102245B CN201610576658.6A CN201610576658A CN106102245B CN 106102245 B CN106102245 B CN 106102245B CN 201610576658 A CN201610576658 A CN 201610576658A CN 106102245 B CN106102245 B CN 106102245B
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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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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- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
This application discloses LED dimmer, LED light-dimming method and LED drive devices.The LED dimmer includes: zero crossing detection module, for detecting the zero-acrross ing moment of AC-input voltage, to generate zero passage detection signal；Cycle detection module obtains the periodic signal for characterizing the AC-input voltage period according to continuous zero passage detection signal；Time delay module, for generating enabling signal according to zero passage detection signal and periodic signal；Number generator is dimmed, for generating pulse signal according to enabling signal；And modulator, for AC-input voltage and multiple pulse signals is superimposed, so that power carrier signal is generated, to control the brightness and/or color of LED light.Light modulator controls the signal modulation moment using time delay module, and LED drive device decouples the moment using reference voltage control signal, so that LED light adjusting system can be adapted for different alternating current standards.
Description
Technical field
The present invention relates to light source control technologies, more particularly, to the LED dimmer for LED light, LED light-dimming method
And LED drive device.
Background technique
When light emitting diode (light-emitting diode, LED) is used for lighting area, using LED dimming device
Brightness is adjusted to meet the individual demand of user or need to dim to reduce energy consumption according to environment.Using LED dimming device
The brightness and colour temperature of adjustable LED, to reach the demand of user.
LED dimming device is for example, by using traditional controllable silicon dimmer.However, controllable silicon dimmer, which exists, maintains electric current one
The different problem of cause property, and there is also differences for the product of every country, each brand, are easy to appear asking for light modulator compatibility
Topic.In addition, phenomena such as there is also flashing in dimming process.Further improved LED dimming device uses power modulus of conversion
Block provides DC output voltage, and the electric current realization light modulation of LED light is flowed through by changing.Power conversion module is adapted to wide scope
Supply voltage and stable electric current is provided, and intelligent dimming may be implemented, therefore be widely used.
Fig. 1 shows the schematic block diagram of LED light adjusting system according to prior art.The LED light adjusting system includes light modulator
110, LED drive device 120 and LED light 130.Light modulator 110 is connected with LED drive device 120 via Alternating Current Power Supply line.It adjusts
Light device 110 generates power carrier signal depending on the user's operation.Load of the LED light 130 as 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.
The 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 DC output voltage by block 122.Decoupling module 123 obtains electric power from DC bus-bar voltage
Carrier signal, and light modulation data-signal is decoded, control module 124 further generates control letter 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 variation of stream, the brightness of LED, color can change.
In the LED light adjusting system, light modulator and LED drive device are connected in series, and use public phase line and zero
Line power supply and transmission power carrier signal.In the solution that the signal modulation that light modulator end carries out is controlled and carried out at LED driving end
Coupling control, it is consistent with the period of AC-input voltage, so as to be used to transmit light modulation data-signal for AC-input voltage.
However, since the alternating current 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 alternating current standard
Area, to need to design different LED light adjusting system for country variant or area, cause the increased costs of chip manufacturer with
And user is inconvenient for use.
Summary of the invention
In view of this, using and prolonging at light modulator end the purpose of the present invention is to provide a kind of light modulator and LED drive device
When module control signal modulate the moment, LED drive device end using reference voltage control signal decouple the moment, so as to so that
Obtaining LED light adjusting system can be adapted for different alternating current standards.
According to the first aspect of the invention, a kind of LED dimmer is provided characterized by comprising dim data
Device, for generating pulse signal according to enabling signal；And modulator, it is used for AC-input voltage and multiple pulse signal phases
Superposition, so that power carrier signal is generated, to control the brightness and/or color of LED light.
Preferably, further includes: zero crossing detection module, for detecting the zero-acrross ing moment of AC-input voltage, to generate zero passage
Detect signal；Cycle detection module obtains the week for characterizing the AC-input voltage period according to continuous zero passage detection signal
Phase signal；And time delay module is delayed to generate enabling signal for according to zero passage detection signal and periodic signal, with
So that LED dimmer is suitable for different alternating current standards.
Preferably, the zero crossing detection module is changed into negative voltage from positive voltage value for detecting the AC-input voltage
Value and the zero-acrross ing moment for being changed at least one of positive voltage value from negative value.
Preferably, the time delay module is after zero-acrross ing moment, delay scheduled time, by the enabling signal from invalid shape
State is changed into effective status.
Preferably, the predetermined time, wherein T0 was the week of AC-input voltage in the range of 3/8*T0~7/16*T0
Phase.
Preferably, the pulse signal characterizes digital value using level.
Preferably, the modulator carries out amplitude modulation.
According to the second aspect of the invention, a kind of LED drive device is provided characterized by comprising rectifier bridge is used for
AC-input voltage is rectified to obtain DC bus-bar voltage；Power conversion module is straight for being generated according to DC bus-bar voltage
Output voltage is flowed, to power for LED light；Enabled module, for generating enable signal according to DC bus-bar voltage, so that
LED dimmer is suitable for different alternating current standards；Decoupling module, for working under the control of enable signal, from DC bus
Voltage obtains power carrier signal, and decodes light modulation data-signal；Control module, for being generated according to light modulation data-signal
Signal is controlled, thus the output voltage and/or electric current of regulation power conversion module, wherein the LED drive device detects pulse
Signal, to realize the decoupling control of power carrier signal.
Preferably, the power conversion module is flyback power converter.
Preferably, the decoupling module includes: high-pass filter, for obtaining high-frequency signal from DC bus-bar voltage；With
And second comparator, for the high-frequency signal to compare with reference voltage, to generate the light modulation data-signal.
Preferably, the enabled module includes: first comparator, for by DC bus-bar voltage compared with reference voltage
Compared with to provide enable signal.
Preferably, the enabled module includes: no-voltage detection module, when for detecting the no-voltage of DC bus-bar voltage
It carves, to generate no-voltage detection signal；And time delay module, it is enabled to be used for the delay scheduled time generation after the no-voltage moment
Signal.
Preferably, the predetermined time, wherein T0 was AC-input voltage for example within the scope of 1/4*T0~3/8*T0
Period.
Preferably, the enabled module includes: first comparator, for by DC bus-bar voltage compared with reference voltage
Compared with to generate first control signal；No-voltage detection module, for detecting the no-voltage moment of DC bus-bar voltage, to generate
No-voltage detects signal；Time delay module, for the delay scheduled time generation second control signal after the no-voltage moment；And
Logic gate, it is used that enable signal is generated according to first control signal and second control signal.
Preferably, the predetermined time, wherein T0 was AC-input voltage for example within the scope of 1/4*T0~3/8*T0
Period.
According to the third aspect of the invention we, a kind of LED light-dimming method is provided, comprising: generate enabling signal；Generate period letter
Number；Pulse signal is generated according to enabling signal and periodic signal；And AC-input voltage and multiple pulse signals is superimposed,
To generate power carrier signal, to control the brightness and/or color of LED light.
Preferably, generating enabling signal includes: to detect the zero-acrross ing moment of AC-input voltage, to generate zero passage detection letter
Number；And be delayed according to zero passage detection signal to generate enabling signal, to be suitable for different alternating current standards.
Preferably, generating periodic signal includes: to be obtained according to continuous zero passage detection signal for characterizing exchange input electricity
Press the periodic signal in period.
Preferably, the zero-acrross ing moment for detecting AC-input voltage includes: to detect the AC-input voltage from positive voltage value
It is changed into negative value and is changed into the zero-acrross ing moment of at least one of positive voltage value from negative value.
Preferably, after zero-acrross ing moment, the enabling signal is changed into effectively by delay scheduled time from invalid state
State.
Preferably, the predetermined time, wherein T0 was the week of AC-input voltage in the range of 3/8*T0~7/16*T0
Phase.
Preferably, the pulse signal characterizes digital value using level.
Preferably, by amplitude modulation, power carrier signal is generated.
Preferably, further includes: DC output voltage is generated according to DC bus-bar voltage, to power for LED light；Generation makes
It can signal；According to enable signal, power carrier signal is obtained from DC bus-bar voltage, and decode light modulation data-signal；Root
Control signal is generated according to light modulation data-signal；And according to it is described control Signal Regulation power conversion module output voltage and/
Or electric current, to control the brightness and/or colour temperature of LED light.
Preferably, generating enable signal includes: that DC bus-bar voltage compares with reference voltage, to provide enabled letter
Number, to be suitable for different alternating current standards.
Preferably, generating enable signal includes: to detect the no-voltage moment of DC bus-bar voltage, to generate no-voltage detection
Signal；And delay scheduled time generates enable signal after the no-voltage moment.
Preferably, generating enable signal includes: that DC bus-bar voltage compares with reference voltage, to provide the first control
Signal；The no-voltage moment of DC bus-bar voltage is detected, to generate no-voltage detection signal；Postpone after the no-voltage moment pre-
It fixes time and generates second control signal；It is enabled to generate and to first control signal and second control signal progress and operation
Signal.
LED light adjusting system according to an embodiment of the present invention controls the signal modulation moment using time delay module at light modulator end,
The moment is decoupled using reference voltage control signal at LED drive device end.In each half power frequency period close to end when
Between section detect pulse signal, to realize the decoupling control of power carrier signal.Therefore, LED drive device is without complexity
Data resolution module parsing light modulation data-signal, so as to reduce circuit cost.
Since reference voltage is arranged according to the amplitude of AC-input voltage and the nominal value of frequency and undulating value,
The LED light adjusting system can be adapted for the country of different alternating current standards, to can set for country variant or area
General LED light adjusting system is counted, to reduce the cost of chip manufacturer and be convenient for the user to use.
Further, since 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, AC-input voltage is used to power for light modulator and LED drive device.Thus, it should
LED light adjusting system can mitigate the interference powered to carrier signal transmission, to improve the reliability of circuit.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 shows the schematic block diagram of LED light adjusting system according to prior art；
Fig. 2 shows the schematic block diagrams of LED light adjusting system according to a first embodiment of the present invention；
Fig. 3 shows the schematic block diagram of LED light adjusting system according to a first embodiment of the present invention；And
Fig. 4 shows the schematic block diagram of LED light adjusting system according to a first embodiment of the present invention.
Specific embodiment
Hereinafter reference will be made to the drawings, and the present invention will be described in more detail.In various figures, identical element is using similar attached
Icon is remembered to indicate.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.Furthermore, it is possible to be not shown certain
Well known part.
Many specific details of the invention, such as structure, material, size, the processing work of device is described hereinafter
Skill and technology, to be more clearly understood that the present invention.But it just as the skilled person will understand, can not press
The present invention is realized according to these specific details.
The present invention can be presented in a variety of manners, some of them example explained below.
Fig. 2 shows the schematic block diagrams of LED light adjusting system according to a first embodiment of the present invention.
The LED light adjusting system includes light modulator 210, LED drive device 220 and LED light 230.Light modulator 210 is used as master control
Device processed, for generating power carrier signal depending on the user's operation, LED drive device 220 is used for as from controller according to electricity
Power carrier signal controls the DC output voltage for being supplied to LED light 230.
Different from the LED light adjusting system of the prior art shown in FIG. 1, LED according to a first embodiment of the present invention dims system
Light modulator 210 in the system signal modulation in each half power frequency period generates power carrier signal.For this purpose, light modulator 210 includes
Zero crossing detection module 211, cycle detection module 215, time delay module 212, light modulation number generator 213 and modulator 214.
The input terminal of light modulator 210 is connected to phase line, and output end is connected to LED drive device 220, so as to via electricity
Line of force transmission light modulation data-signal.Light modulator 210 receives AC-input voltage, and the frequency of the AC-input voltage is, for example, 50Hz
(0.02 second period) or 60Hz (0.017 second period), corresponding period are T0.
Zero crossing 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 generates zero passage detection signal.
Cycle detection module 215 receives zero passage detection signal, is obtained according to continuous zero passage detection signal and is handed over for characterizing
Flow the periodic signal in input voltage period.
Time delay module 212 receives zero passage detection signal and periodic signal, and generates enabling signal.After zero-acrross ing moment
Delay scheduled time Δ t.After each half power frequency period, at the time of after the peak value or valley of AC-input voltage, starting
Signal is transformed into effective status from invalid state.For example, predetermined time Δ t is 3/8*T0~7/16*T0.Preferably, this when
The sinusoidal waveform for being located at AC-input voltage is carved close near the position of zero passage, correspondingly, the predetermined time, Δ t was about 7/16*
T0.In this embodiment, light modulator 210 is used as transmitting terminal, carries out signal modulation before each half power frequency period terminates.Even if
The amplitude or frequency fluctuation of alternating current input voltage magnitude and/or frequency difference or AC-input voltage under different alternating current standards,
LED drive device 220 is used as receiving end, can capture power carrier signal.
It dims number generator 213 and receives enabling signal, when enabling signal is effective, light modulation number generator 213 is provided
Pulse signal.The pulse signal characterizes digital value using level, such as high level characterizes digital " 1 ", low level characterization number
“0”。
Modulator 214 is superimposed with AC-input voltage by pulse signal, to generate power carrier signal.The electric power carries
Wave signal is, for example, the sine wave of the amplitude modulation in each half work period.
Light modulator 210 is connected with LED drive device 220 via Alternating Current Power Supply line.For example, light modulator 210 is connected to city
The phase line of power grid.The first input end of LED drive device 220 is connected to light modulator 210, and the second input terminal is connected to alternating current electricity
The zero curve of net.Load of the LED light 230 as power conversion module is connected to the 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 223,224 and of control module
Comparator 225.
Rectifier bridge 211 is, for example, full bridge rectifier, obtains AC-input voltage from utility grid, is obtained through over commutation straight
Flow busbar voltage Vbus.The DC bus-bar voltage Vbus is, for example, the DC pulse moving voltage of half power frequency period.
Power conversion module 222 is, for example, inverse-excitation type (FLY-BACK) power inverter comprising main switch, by direct current
Busbar voltage Vbus is converted further into DC output voltage.
The inverting input terminal of comparator 225 receives DC bus-bar voltage Vbus, and non-inverting input terminal receives reference voltage Vref,
Output end provides enable signal EN.Reference voltage Vref can be according to the amplitude of AC-input voltage and the nominal value of frequency and wave
It moves value and determines.
In the embodiment, reference voltage is for example selected in the range of 80V-100V, with 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 the amplitude and frequency fluctuation of AC-input voltage.
The decoupling module 223 receives DC bus-bar voltage Vbus and enable signal EN.When enable signal EN is effective, decoupling
Module 223 works.Decoupling module 223 is for example including high-pass filter and comparator.High-pass filter is from DC bus-bar voltage
Vbus obtains high-frequency signal.Comparator compares the high-frequency signal with reference voltage, to generate the light modulation data-signal.
Control module 224 further generates control signal, such as pulse-width signal according to light modulation data-signal.Power turns
Mold changing block 222 adjusts output voltage and/or electric current under control of the control signal.Due to the variation of output voltage and/or electric current,
The brightness of LED light, color change, to realize light modulation.
Fig. 3 shows the schematic block diagram of LED light adjusting system according to a second embodiment of the present invention.
Light modulator 210 is connected with LED drive device 220 via Alternating Current Power Supply line.For example, light modulator 210 is connected to city
The phase line of power grid.The first input end of LED drive device 220 is connected to light modulator 210, and the second input terminal is connected to alternating current electricity
The zero curve of net.Load of the LED light 230 as power conversion module is connected to the first output end and of LED drive device 220
Between two output ends.
Similar with LED light adjusting system according to a first embodiment of the present invention shown in Fig. 2, which includes adjusting
Light device 210, LED drive device 220 and LED light 230.Light modulator 210 is used as master controller, for generating depending on the user's operation
Power carrier signal, LED drive device 220 are supplied to LED light for controlling according to power carrier signal as from controller
230 DC output voltage.
Different from LED light adjusting system according to a first embodiment of the present invention shown in Fig. 2, LED drive device 220 includes whole
Flow bridge 211, power conversion module 222, decoupling module 223, control module 224, no-voltage detection module 226 and time delay module
227。
Rectifier bridge 211 is, for example, full bridge rectifier, obtains AC-input voltage from utility grid, is obtained through over commutation straight
Flow busbar voltage Vbus.
Power conversion module 222 is, for example, inverse-excitation type (FLY-BACK) power inverter comprising main switch, by direct current
Busbar voltage Vbus is converted further into DC output voltage.
No-voltage detection module 226 is directed to DC bus-bar voltage Vbus, when detection is depressed into the no-voltage of no-voltage from positive electricity
T1 is carved, and generates no-voltage detection signal.
Time delay module 227 receives no-voltage and detects signal, and delay scheduled time Δ t, generation make after the no-voltage moment
It can signal EN.After each half power frequency period, at the time of after the peak value of DC bus-bar voltage, enable signal EN is from invalid shape
State is transformed into effective status.Predetermined time Δ t can be according to the amplitude of AC-input voltage and the nominal value of frequency and undulating value
And it determines.
In the embodiment, the predetermined time, Δ t was for example selected within the scope of 1/4*T0~3/8*T0, with adapt to every country or
City's electric standard in area, and adapt to the amplitude and frequency fluctuation of AC-input voltage.Preferably, which is located at DC bus
Near the position of voltage peak, correspondingly, the predetermined time, Δ t was about 1/4*T0.
The decoupling module 223 receives DC bus-bar voltage Vbus and enable signal EN.When enable signal EN is effective, decoupling
Module 223 works.Decoupling module 223 is for example including high-pass filter and comparator.High-pass filter is from DC bus-bar voltage
Vbus obtains high-frequency signal.Comparator compares the high-frequency signal with reference voltage, to generate the light modulation data-signal.
Control module 224 further generates control signal, such as pulse-width signal according to light modulation data-signal.Power turns
Mold changing block 222 adjusts output voltage and/or electric current under control of the control signal.Due to the variation of output voltage and/or electric current,
The brightness of LED light, color change, to realize light modulation.
In this embodiment, light modulator 210 is used as transmitting terminal, carries out signal modulation before each half power frequency period terminates.
Even if the amplitude or frequency of alternating current input voltage magnitude and/or frequency difference or AC-input voltage under different alternating current standards
Rate fluctuation, LED drive device 220 are used as receiving end, can capture power carrier signal.
Fig. 4 shows the schematic block diagram of LED light adjusting system according to a third embodiment of the present invention.
Light modulator 210 is connected with LED drive device 220 via Alternating Current Power Supply line.For example, light modulator 210 is connected to city
The phase line of power grid.The first input end of LED drive device 220 is connected to light modulator 210, and the second input terminal is connected to alternating current electricity
The zero curve of net.Load of the LED light 230 as power conversion module is connected to the first output end and of LED drive device 220
Between two output ends.
Similar with LED light adjusting system according to a first embodiment of the present invention shown in Fig. 2, which includes adjusting
Light device 210, LED drive device 220 and LED light 230.Light modulator 210 is used as master controller, for generating depending on the user's operation
Power carrier signal, LED drive device 220 are supplied to LED light for controlling according to power carrier signal as from controller
230 DC output voltage.
Different from LED light adjusting system according to a first embodiment of the present invention shown in Fig. 2, LED drive device 220 includes whole
Flow bridge 211, power conversion module 222, decoupling module 223, control module 224, comparator 225, no-voltage detection module 226,
Time delay module 227 and with door 228.
Rectifier bridge 211 is, for example, full bridge rectifier, obtains AC-input voltage from utility grid, is obtained through over commutation straight
Flow busbar voltage Vbus.
Power conversion module 222 is, for example, inverse-excitation type (FLY-BACK) power inverter comprising main switch, by direct current
Busbar voltage Vbus is converted further into DC output voltage.
The non-inverting input terminal of comparator 225 receives DC bus-bar voltage Vbus, and inverting input terminal receives reference voltage Vref,
Output end provides 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 the embodiment, reference voltage is for example selected in the range of 80V-100V, with 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 the amplitude and frequency fluctuation of AC-input voltage.
No-voltage detection module 226 is directed to DC bus-bar voltage Vbus, when detection is depressed into the no-voltage of no-voltage from positive electricity
T1 is carved, and generates no-voltage detection signal.
The no-voltage that time delay module 227 receives detects signal, and the delay scheduled time Δ t after the no-voltage moment generates the
Two control signals.After each half power frequency period, second control signal is from nothing at the time of after the peak value of DC bus-bar voltage
Effect state is transformed into effective status.Predetermined time Δ t can be according to the amplitude of AC-input voltage and the nominal value of frequency and wave
It moves value and determines.
In the embodiment, the predetermined time, Δ t was for example selected within the scope of 1/4*T0~3/8*T0, with adapt to every country or
City's electric standard in area, and adapt to the amplitude and frequency fluctuation of AC-input voltage.Preferably, which is located at DC bus
Near the position of voltage peak, correspondingly, the predetermined time, Δ t was about 1/4*T0.
First control signal and second control signal are received respectively with the first input end of door 228 and the second input terminal, it is defeated
Outlet provides enable signal EN.In alternate embodiments, identical function can be realized using arbitrary logic gate.
The decoupling module 223 receives DC bus-bar voltage Vbus and enable signal EN.When enable signal EN is effective, decoupling
Module 223 works.Decoupling module 223 is for example including high-pass filter and comparator.High-pass filter is from DC bus-bar voltage
Vbus obtains high-frequency signal.Comparator compares the high-frequency signal with reference voltage, to generate the light modulation data-signal.
Control module 224 further generates control signal, such as pulse-width signal according to light modulation data-signal.Power turns
Mold changing block 222 adjusts output voltage and/or electric current under control of the control signal.Due to the variation of output voltage and/or electric current,
The brightness of LED light, color change, to realize light modulation.
In this embodiment, light modulator 210 is used as transmitting terminal, carries out signal modulation before each half power frequency period terminates.
Even if the amplitude or frequency of alternating current input voltage magnitude and/or frequency difference or AC-input voltage under different alternating current standards
Rate fluctuation, LED drive device 220 are used as receiving end, can capture power carrier signal.
LED light adjusting system according to an embodiment of the present invention, in the AC-input voltage week of light modulator end detection utility grid
Phase controls the signal modulation moment using time delay module.In each half power frequency period, power carrier letter is generated using signal modulation
Number, in continuous multiple half power frequency periods, transmission light modulation data-signal.In a preferred embodiment, light modulator is as transmission
End, carries out signal modulation, LED drive device can be captured easily as receiving end before each half power frequency period terminates
Power carrier signal.
Light modulator 210 is using zero crossing detection module, cycle detection module and time delay module, it can realizes power carrier letter
Number modulation control.Therefore, light modulator 210 is without dedicated power line carrier, PLC chip, for example, low voltage power line carrier
Communication chip PL3106, so as to reduce circuit cost.
Period close to end of the LED drive device 220 in each half power frequency period detects pulse signal, to realize
The decoupling control of power carrier signal.Therefore, LED drive device 220 parses light modulation without complicated data resolution module
Data-signal, so as to reduce circuit cost.
Further, it due to using signal modulation, within the of short duration time close to end in each half power frequency period, hands over
Stream input voltage is used for transmission signal, and within most of the time, AC-input voltage is used to be light modulator and LED drive device
Power supply.Thus, which can mitigate the interference powered to carrier signal transmission, to improve the reliability of circuit.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
It is as described above according to the embodiment of the present invention, these embodiments details all there is no detailed descriptionthe, also not
Limiting the invention is only the specific embodiment.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is principle and practical application in order to better explain the present invention, thus belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its full scope and equivalent.
Claims (27)
1. a kind of LED dimmer characterized by comprising
Number generator is dimmed, for generating pulse signal according to enabling signal；And
Modulator, in each half power frequency period that AC-input voltage and multiple pulse signals is superimposed, to generate
Power carrier signal, to control the brightness and/or color of LED light.
2. LED dimmer according to claim 1, which is characterized in that further include:
Zero crossing detection module, for detecting the zero-acrross ing moment of AC-input voltage, to generate zero passage detection signal；
Cycle detection module obtains the period letter for characterizing the AC-input voltage period according to continuous zero passage detection signal
Number；And
Time delay module, for being delayed to generate enabling signal, so that LED according to zero passage detection signal and periodic signal
Light modulator is suitable for different alternating current standards.
3. LED dimmer according to claim 2, which is characterized in that the zero crossing detection module is for detecting the friendship
Stream input voltage is changed into negative value from positive voltage value and is changed into the mistake of at least one of positive voltage value from negative value
Zero moment.
4. LED dimmer according to claim 2, which is characterized in that the time delay module is after zero-acrross ing moment, delay
The enabling signal is changed into effective status from invalid state by the predetermined time.
5. LED dimmer according to claim 4, which is characterized in that the predetermined time is 3/8*T0~7/16*T0's
In range, wherein T0 is the period of AC-input voltage.
6. LED dimmer according to claim 2, which is characterized in that the pulse signal characterizes digital value using level.
7. LED dimmer according to claim 2, which is characterized in that the modulator carries out amplitude modulation.
8. a kind of LED drive device characterized by comprising
Rectifier bridge, for rectifying AC-input voltage to obtain DC bus-bar voltage；
Power conversion module, for generating DC output voltage according to DC bus-bar voltage, to power for LED light；
Enabled module, for generating enable signal according to DC bus-bar voltage, so that LED dimmer is suitable for different cities
Electric standard；
Decoupling module obtains power carrier signal from DC bus-bar voltage, and solve for working under the control of enable signal
Code goes out light modulation data-signal；
Control module, for generating control signal according to light modulation data-signal, thus the output voltage of regulation power conversion module
And/or electric current,
Wherein, the LED drive device detects pulse signal in each half power frequency period, to realize the solution of power carrier signal
Coupling control.
9. LED drive device according to claim 8, which is characterized in that the power conversion module is flyback power
Converter.
10. LED drive device according to claim 8, which is characterized in that the decoupling module includes:
High-pass filter, for obtaining high-frequency signal from DC bus-bar voltage；And
Second comparator, for the high-frequency signal to compare with reference voltage, to generate the light modulation data-signal.
11. LED drive device according to claim 8, which is characterized in that the enabled module includes:
First comparator, for DC bus-bar voltage to compare with reference voltage, to provide enable signal.
12. LED drive device according to claim 8, which is characterized in that the enabled module includes:
No-voltage detection module, for detecting the no-voltage moment of DC bus-bar voltage, to generate no-voltage detection signal；And
Time delay module, for the delay scheduled time generation enable signal after the no-voltage moment.
13. LED drive device according to claim 12, which is characterized in that the predetermined time is in 1/4*T0~3/8*
Within the scope of T0, wherein T0 is the period of AC-input voltage.
14. LED drive device according to claim 8, which is characterized in that the enabled module includes:
First comparator, for DC bus-bar voltage to compare with reference voltage, to generate first control signal；
No-voltage detection module, for detecting the no-voltage moment of DC bus-bar voltage, to generate no-voltage detection signal；
Time delay module, for the delay scheduled time generation second control signal after the no-voltage moment；And
Logic gate, it is used that enable signal is generated according to first control signal and second control signal.
15. LED drive device according to claim 14, which is characterized in that the predetermined time is in 1/4*T0~3/8*
Within the scope of T0, wherein T0 is the period of AC-input voltage.
16. a kind of LED light-dimming method, comprising:
Generate enabling signal；
Generate periodic signal；
Pulse signal is generated according to enabling signal and periodic signal；And
It is in each half power frequency period that AC-input voltage and multiple pulse signals is superimposed, to generate power carrier letter
Number, to control the brightness and/or color of LED light.
17. according to the method for claim 16, wherein generating enabling signal includes:
The zero-acrross ing moment of AC-input voltage is detected, to generate zero passage detection signal；And
It is delayed according to zero passage detection signal to generate enabling signal, to be suitable for different alternating current standards.
18. according to the method for claim 17, wherein generating periodic signal includes:
The periodic signal for characterizing the AC-input voltage period is obtained according to continuous zero passage detection signal.
19. according to the method for claim 18, wherein the zero-acrross ing moment for detecting AC-input voltage includes: described in detection
AC-input voltage is changed into negative value from positive voltage value and is changed at least one of positive voltage value from negative value
Zero-acrross ing moment.
20. according to the method for claim 18, wherein after zero-acrross ing moment, delay scheduled time believes the starting
Number it is changed into effective status from invalid state.
21. according to the method for claim 20, wherein the predetermined time in the range of 3/8*T0~7/16*T0,
Middle T0 is the period of AC-input voltage.
22. according to the method for claim 18, wherein the pulse signal characterizes digital value using level.
23. according to the method for claim 18, wherein by amplitude modulation, generate power carrier signal.
24. according to the method for claim 18, further includes:
DC output voltage is generated according to DC bus-bar voltage, to power for LED light；
Generate enable signal；
According to enable signal, power carrier signal is obtained from DC bus-bar voltage, and decode light modulation data-signal；
Control signal is generated according to light modulation data-signal；And
According to the output voltage and/or electric current of the control Signal Regulation power conversion module, to control the brightness of LED light
And/or colour temperature.
25. according to the method for claim 24, wherein generating enable signal includes:
DC bus-bar voltage is compared with reference voltage, to provide enable signal, to be suitable for different alternating current standards.
26. according to the method for claim 24, wherein generating enable signal includes:
The no-voltage moment of DC bus-bar voltage is detected, to generate no-voltage detection signal；And
Delay scheduled time generates enable signal after the no-voltage moment.
27. according to the method for claim 24, wherein generating enable signal includes:
DC bus-bar voltage is compared with reference voltage, to provide first control signal；
The no-voltage moment of DC bus-bar voltage is detected, to generate no-voltage detection signal；
Delay scheduled time generates second control signal after the no-voltage moment；And
To first control signal and second control signal carries out and operation, to generate enable signal.
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| CN201610576658.6A CN106102245B (en) | 2016-07-20 | 2016-07-20 | LED dimmer, LED light-dimming method and LED drive device |
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| CN111830816B (en) * | 2020-06-28 | 2023-05-12 | 南京天朗防务科技有限公司 | Self-adaptive timing method and device |
| CN112689356B (en) * | 2021-01-08 | 2023-11-10 | 青岛易来智能科技股份有限公司 | Switch control circuit and method and lamp |
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