CN207783208U - Dim conversion module, LED drive device - Google Patents
Dim conversion module, LED drive device Download PDFInfo
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- CN207783208U CN207783208U CN201721764843.4U CN201721764843U CN207783208U CN 207783208 U CN207783208 U CN 207783208U CN 201721764843 U CN201721764843 U CN 201721764843U CN 207783208 U CN207783208 U CN 207783208U
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Abstract
This application discloses light modulation conversion module, LED drive devices.The LED drive device is used to drive LED light, including：Rectifier bridge, for by AC-input voltage rectification to obtain DC bus-bar voltage；Conversion module is dimmed, for dim signal to be converted into brightness control signal according to the type of light modulator；Control module controls signal for generating first switch according to the brightness control signal；And power conversion module, the DC bus-bar voltage is converted into direct-flow output signal for controlling signal according to the first switch, to transmit electric energy to LED light, wherein, the power conversion module controls electric energy transmission according to the brightness control signal, to adjust the brightness of the LED light.The LED drive device can be completely compatible with existing 0 10V direct current light modulators with the different types of light modulator of automatic identification, so as to improve and the matched compatibility of different types of light modulator and reduction design cost and manufacturing cost.
Description
Technical field
The utility model is related to light source control technologies, more particularly, to light modulation conversion module, LED drive device.
Background technology
When light emitting diode (light-emitting diode, LED) is used for lighting area, using LED light modulating devices
Brightness is adjusted to meet the individual demand of user or need to dim to reduce energy consumption according to environment.Using LED light modulating devices
Brightness and the colour temperature that LED can be adjusted, to reach the demand of user.
LED light modulating devices are for example, by using traditional controllable silicon dimmer.However, controllable silicon dimmer, which exists, maintains electric current one
The problem of cause property differs, and there is also differences for the product of every country, each brand, are susceptible to asking for light modulator compatibility
Topic.In addition, phenomena such as there is also flicker in dimming process.Further improved LED light modulating devices use 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 systems according to prior art.The LED light adjusting systems include light modulator
110, LED drive device 120 and LED light 130.Light modulator 110 generates dim signal Vadj depending on the user's operation.LED drives
Device 120 changes the size of output current or effective lighting time according to dim signal Vadj.LED light 130 turns as power
The load for changing the mold block, is connected between two output ends of LED drive device 120.LED drive device 120 includes rectifier bridge
121, power conversion module 12 and control module 123.The rectifier bridge 121 obtains AC-input voltage from utility grid, and passes through
Over commutation obtains DC bus-bar voltage.DC bus-bar voltage is converted further into DC output voltage by power conversion module 122.
Control module 123 receives dim signal Vadj, and control signal is further generated according to light modulation data.Power conversion module 122 exists
It controls and adjusts at least one of output voltage, output current and duty ratio under the control of signal.Due to output voltage, output electricity
The variation of stream and at least one of duty ratio, the brightness of LED, color can change.
The operation principle of three kinds of different types of light modulators is shown respectively in Fig. 2 (a) to (c).As shown in Fig. 2 (a), light modulator
110 divide constant DC input voitage Vin using adjustable resistance R11, to obtain amplitude corresponding with LED luminance
DC voltage (such as 0-10V) is used as dim signal Vadj, and the amplitude of dim signal Vadj is for characterizing LED luminance.Such as Fig. 2
(b) shown in, 210 incoming transport electricity power grid of light modulator generates power carrier signal as dim signal Vadj, which uses
In transmission light modulation data to characterize LED luminance.As shown in Fig. 2 (c), light modulator 310 connects pulsewidth modulation (PWM) signal and occurs
Device generates pwm signal as dim signal Vadj, and the duty ratio of the dim signal is for characterizing LED luminance.
The dim signal Vadj of above-mentioned different types of light modulator can characterize LED luminance, however, not due to operation principle
Together, the signal type of different types of light modulator, output impedance and output characteristics are inconsistent.LED drive device 120 can only be rung
Certain types of light modulator 110 is answered, so as to cause the poor compatibility of LED drive device 120.
For different types of dimming mode, LED drive device 120 is required to redesign, therefore light adjusting system cost
It is high.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of light modulation conversion module, LED drive devices, wherein adopt
The type of dim signal is identified with light modulation conversion module, and dim signal is converted into the control signal of regulating style, to carry
Its high compatibility and reduce its design cost and manufacturing cost.
It is according to the present utility model in a first aspect, provide a kind of light modulation conversion module, including：Sampling module, for exchanging
The dim signal that light device generates is sampled to obtain signal waveform and light modulation data；And signal generator module, it is used for basis
The signal waveform generates second switch and controls signal, and generates the brightness control signal according to the light modulation data.
Preferably, the light modulator is passive light modulator, and the light modulation conversion module further includes：Current generating module is used
In providing constant current to the passive light modulator to generate the dim signal.
Preferably, the current generating module includes multiple current branch, and each current branch includes one be connected in series with
A current source and a selecting switch.
Preferably, the sampling module includes：Operational amplifier, described in the in-phase input end of the operational amplifier receives
Dim signal, inverting input are connect with output end, to form follower；First switch and the second switch, the first switch
First end be connected to the output end of the operational amplifier, the first end of the second switch receives the light modulation and believes
Number, the second end of the second end of the first switch and the second switch is connected to public first node；First partial pressure net
Network and the second potential-divider network, are connected in parallel between the first node and ground, provide the first sampled signal and second respectively and adopt
Sample signal；And low-pass filter, it is connected to second potential-divider network, second sampled signal is filtered, wherein
First sampled signal and second sampled signal characterize the signal waveform and the light modulation data respectively.
Preferably, the first switch and the second switch are respectively partly to be led selected from bipolar transistor and metal oxide
Any one of body field-effect tube.
Preferably, the type of the light modulator is passive selected from PWM light modulators, the active direct current light modulators of 0-10V and 0-10V
At least one of light modulator.
Preferably, second switch control signal for first switch described in the Type Control according to the light modulator and
The working condition of the on off state of the second switch and the current generating module.
Preferably, when identifying the type of the light modulator, the light modulation conversion module works in one of following pattern：The
One pattern, the current generating module are disconnected with the light modulator, and the first switch is closed, and the second switch disconnects；The
Two modes, the current generating module provide the constant current to the light modulator, and the first switch disconnects, and described second
Switch is closed；And the third mode, the current generating module are connect with the light modulator, the first switch is closed, described
Second switch disconnects.
Preferably, when identifying the type of the light modulator, the light modulation conversion module executes following operation：If described
Signal generator module detects the voltage value of the dim signal in any of first mode and second mode, then further
The light modulator is judged for one of PWM light modulators and active direct current light modulator according to the wave characteristics of the dim signal, if
The dim signal is not detected in any of the first mode and the second mode in the signal generator module
Voltage value, and detect in the third mode voltage value of the dim signal then judges the light modulator to be passive
Light modulator.
Preferably, the brightness control signal is pwm signal, and dims data described in the duty ratio of the pwm signal
It is consistent.
Preferably, the brightness control signal is d. c. voltage signal, and the amplitude of the d. c. voltage signal and institute
It is consistent to state light modulation data.
Second aspect according to the present utility model provides a kind of LED drive device, including：Rectifier bridge, it is defeated for that will exchange
Enter voltage commutation to obtain DC bus-bar voltage；
Conversion module is dimmed, including：Sampling module, for being sampled the dim signal that light modulator generates to obtain letter
Number waveform and light modulation data；And signal generator module, signal is controlled for generating second switch according to the signal waveform, with
And generate the brightness control signal according to the light modulation data；
Control module controls signal for generating first switch according to the brightness control signal；And
The DC bus-bar voltage is converted into direct current by power conversion module for controlling signal according to the first switch
Output signal, to transmit electric energy to LED light, wherein the power conversion module controls electricity according to the brightness control signal
It can transmit, to adjust the brightness of the LED light.
Preferably, the light modulator is passive light modulator, and the light modulation conversion module further includes：
Current generating module, for providing constant current to the passive light modulator to generate the dim signal.
Preferably, the current generating module includes multiple current branch, and each current branch includes one be connected in series with
A current source and a selecting switch.
Preferably, the sampling module includes：
Operational amplifier, the in-phase input end of the operational amplifier receive the dim signal, inverting input with it is defeated
Outlet connects, to form follower；
The first end of first switch and the second switch, the first switch is connected to the output of the operational amplifier
End, the first end reception dim signal of the second switch, the second end of the first switch and the second switch
Second end is connected to public first node；
First potential-divider network and the second potential-divider network, are connected in parallel between the first node and ground, provide respectively
One sampled signal and the second sampled signal；And
Low-pass filter is connected to second potential-divider network, is filtered to second sampled signal,
Wherein, first sampled signal and second sampled signal characterize the signal waveform and the light modulation respectively
Data.
Preferably, the first switch and the second switch are respectively partly to be led selected from bipolar transistor and metal oxide
Any one of body field-effect tube.
Preferably, the type of the light modulator is passive selected from PWM light modulators, the active direct current light modulators of 0-10V and 0-10V
At least one of light modulator.
Preferably, second switch control signal for first switch described in the Type Control according to the light modulator and
The working condition of the on off state of the second switch and the current generating module.
Preferably, when identifying the type of the light modulator, the light modulation conversion module works in one of following pattern：
First mode, the current generating module are disconnected with the light modulator, and the first switch is closed, and described second opens
Shutdown is opened；
Second mode, the current generating module provide the constant current to the light modulator, and the first switch is disconnected
It opens, the second switch is closed；And
The third mode, the current generating module are connect with the light modulator, and the first switch is closed, and described second opens
Shutdown is opened.
Preferably, when identifying the type of the light modulator, the light modulation conversion module executes following operation：
If the signal generator module detects the dim signal in any of first mode and second mode
Voltage value, then further judge the light modulator for PWM light modulators and active straight according to the wave characteristics of the dim signal
One of light modulator is flowed,
If institute is not detected in any of the first mode and the second mode in the signal generator module
The voltage value of dim signal is stated, and detects the voltage value of the dim signal in the third mode, then described in judgement
Light modulator is passive light modulator.
Preferably, the brightness control signal is pwm signal, and dims data described in the duty ratio of the pwm signal
It is consistent.
Preferably, the brightness control signal is d. c. voltage signal, and the amplitude of the d. c. voltage signal and institute
It is consistent to state light modulation data.
Preferably, the power conversion module has booster type topology, buck topology, buck-boost type topology and inverse-excitation type
At least one of topology.
According to the light modulation conversion module of the utility model embodiment, LED drive device, wherein using light modulation conversion module
It identifies the type of dim signal, and dim signal is converted into the brightness control signal of regulating style, to adjust the LED
The brightness of lamp.The LED drive device can be complete with existing 0-10V direct current light modulators with the different types of light modulator of automatic identification
It is complete compatible, so as to improve and the matched compatibility of different types of light modulator and reduction design cost and manufacturing cost.
Further, it after light modulation conversion module identifies the type of dim signal, can be produced according to the type of light modulator
Raw different dimming curve so that dimming mode diversification.
In a preferred embodiment, light modulation modulus of conversion current generating module in the block includes multiple current branch, for nothing
Source light modulator can provide corresponding constant current according to the model of light modulator, to ensure that light modulator works normally.Further
Ground, the sampling module and current generating module for dimming conversion module share a terminal, to receive light modulation letter with time-sharing format
Number and provide constant current.The design reduces number of terminals, easy to produce to simplify circuit structure.
Description of the drawings
By referring to the drawings to the description of the utility model embodiment, above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from.
Fig. 1 shows the schematic block diagram of LED light adjusting systems according to prior art.
Fig. 2 (a) to (c) shows the schematic block diagram of different types of dimmer operation principle.
Fig. 3 shows the schematic block diagram of the LED light adjusting systems according to the utility model embodiment.
Fig. 4 shows to dim the schematic block diagram of conversion module in Fig. 3.
Fig. 5 shows to dim the schematic circuit of conversion module in Fig. 3.
Fig. 6 shows the pass of dim signal and brightness control signal according to the LED drive device of the utility model embodiment
It is curve.
Specific implementation mode
Hereinafter reference will be made to the drawings is more fully described the utility model.In various figures, identical element is using similar
Reference numeral 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 parts.
Many specific details of the utility model, such as the structure of device, material, size, place are described hereinafter
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 be presented in a variety of manners, some of them example explained below.
Fig. 3 shows the schematic block diagram of the LED light adjusting systems according to the utility model embodiment.The LED light adjusting system packets
Include light modulator 110, LED drive device 220 and LED light 130.
Light modulator 110 generates dim signal Vadj depending on the user's operation.LED drive device 220 is according to dim signal
Vadj changes the size of output current or effective lighting time.Load of the LED light 130 as power conversion module, is connected to
Between two output ends of LED drive device 220.LED drive device 220 includes rectifier bridge 121, power conversion module 122, control
Molding block 123 and light modulation conversion module 124.The rectifier bridge 121 obtains AC-input voltage from utility grid, and passes through
Rectification obtains DC bus-bar voltage.DC bus-bar voltage is converted further into DC output voltage by power conversion module 122.Example
Such as, power conversion module has at least one in booster type topology, buck topology, buck-boost type topology and reverse exciting topological
Kind.It dims conversion module 124 and receives dim signal Vadj, brightness control signal is further generated according to dim signal Vadj
Vctrl.Power conversion module 122 adjusts output voltage, output current and duty ratio under the control of brightness control signal Vctrl
At least one of.Due to the variation of at least one of output voltage, output current and duty ratio, brightness, the color meeting of LED
It changes.
In this embodiment, LED drive device 220 further identifies dim signal after receiving dim signal
Type, and dim signal is converted into the brightness control signal of regulating style.Therefore, which can be compatible with
Different types of light modulator.
Fig. 4 shows to dim the schematic circuit of conversion module in Fig. 3.It includes sampling module to dim conversion module 124
1241, current generating module 1242 and signal generator module 1243.
The first input end of sampling module 1241 is connected to light modulator, and to receive dim signal Vadj, the second input terminal connects
It is connected to signal generator module 1243, for receiving switch control signal Vsw.Further, the first output of sampling module 1241
End and second output terminal are respectively connected to signal generator module 1243, and provide the first sampled signal Vs1 and second respectively and adopt
Sample signal Vs2.
Current generating module 1242 includes multiple current sources.The input terminal of current generating module 1242 is connected to signal generation
Module 1243 selects a current source, output end to provide and should for receiving switch control signal Vsw from multiple current sources
The corresponding constant current Is of current source.
The first input end of sampling module 1241 can use public terminal with the output end of current generating module 1242, and
And dim signal Vadj is received with time-sharing format and constant current Is is provided.
When detecting light modulator type, signal generator module 1243 provides switch control signal Vsw, to control sampling mould
The on off state of switch K1 and K2 in block 1241 and the selecting switch in current generating module 1242.For example, switch is choosing
From at least one of bipolar transistor and metal oxide semiconductor field effect tube.
When light modulator is PWM light modulators and active direct current light modulator, light modulator itself provides dim signal Vadj.Work as tune
When light device is passive light modulator, current generating module 1242 provides constant current Is to the passive element of light modulator, to adjust
Voltage is generated on the passive element of light device, as dim signal Vadj.Sampling module 1241 provide the first sampled signal Vs1 be
The corresponding signal waveforms of dim signal Vadj, the sampled signal that the second sampled signal Vs2 is dim signal Vadj pass through low pass
The DC voltage obtained later is filtered, the amplitude of the DC voltage is consistent with the light modulation data of dim signal Vadj.
First sampled signal Vs1 is used to characterize the signal waveform of dim signal Vadj, and the second sampled signal Vs2 is for characterizing
The light modulation data of dim signal Vadj.
Further, signal generator module 1243 is according at least one the first sampled signal Vs1 and the second sampled signal Vs2
Generate brightness control signal Vctrl.Brightness control signal Vctrl is, for example, pwm signal or d. c. voltage signal, wherein PWM
The duty ratio of signal or the amplitude of d. c. voltage signal are corresponding with the light modulation data of dim signal Vadj.
Fig. 5 shows to dim the schematic circuit of conversion module in Fig. 3.As shown, adopting in light modulation conversion module 124
Egf block 1241 includes operational amplifier U2, switch K1 and K2, resistance R4 to R8 and capacitance C1.The sampling module 1241 includes
First input end and the second input terminal, receive respectively dim signal Vadj and switch control signal Vsw and the first output end and
Second output terminal provides the first sampled signal Vs1 and the second sampled signal Vs2 respectively.
The in-phase input end of operational amplifier U2 is connected to first input end, receives dim signal Vadj, inverting input
It is connect with output end to form follower.
Further, the output end of operational amplifier U2 and in-phase input end are connected to via switch K1 and K2 public respectively
First node.
Resistance R4 and R5 are connected in series between first node and ground, form the first potential-divider network, the intermediate node of the two
It is connected to the first output end, for providing the first sampled signal Vs1.
Resistance R6 and R7 are connected in series between first node and ground, the second potential-divider network of composition, the intermediate node of the two,
For providing the second sampled signal Vs2.
Resistance R8 and capacitance C1 forms low-pass filter, be connected to resistance R6 and R7 intermediate node and second output terminal it
Between, for being filtered to the second sampled signal Vs2.
The control terminal of switch K1 and K2 are connected to the second input terminal, to receive switch control signal Vsw, and according to opening
It closes control signal Vsw and switches open and close state.
It includes multiple current source I1 to In and multiple selecting switch to dim the current generating module 1242 in conversion module 124
J1 to Jn forms multiple current branch being connected in parallel.Each current branch includes a current source being connected in series with and one
Switch.In switch conduction, a corresponding current source provides constant current Is.The current source of the multiple current branch provides
Constant current it is different, in the case of being judged as passive light modulator, corresponding constant current is applied according to light modulator parameter
To Light modulating device for generating dim signal.
The first input end of signal generator module U1 and the second input terminal receive the first sampled signal Vs1 and second and adopt respectively
Sample signal Vs2, the first output end provide one group of switch control signal Vsw, and second output terminal provides brightness control signal Vctrl.
During the work time, when switch K1 is closed, the follower of operational amplifier U2 compositions works, the input of the follower
Voltage is as output voltage, and when switch K2 is closed, dim signal can be directly connected to the first end of resistance R4 and R6, at this time
Follower is short-circuited.
When detecting light modulator type, signal generator module 1243 provides switch control signal Vsw, to control sampling mould
The on off state of the selecting switch J1 to Jn in switch K1 and K2 and current generating module 1242 in block 1241.
When light modulator is PWM light modulators, current generating module 1242 disconnects, and switch K1 or switch K2 any one close
It closes, the both ends resistance R5 generate the first sampled signal Vs1.First sampled signal Vs1 is the dim signal exported with PWM light modulators
Vadj phases are consistent and the waveform of amplitude partial pressure.Signal generator module 1243 can judge the shape according to the first sampled signal Vs1
State is PWM light modulators.
When light modulator is active direct current light modulator, current generating module 1242 disconnects, and switch K1 or switch K2 are arbitrary
One closure, the both ends resistance R5 generate the first sampled signal Vs1.First sampled signal Vs1 be steady dc voltage (such as
0-10V), i.e., the waveform of partial pressure acquisition is carried out to dim signal Vadj.Signal generator module 1243 is according to the first sampled signal Vs1
The state can be judged for active direct current light modulator.
When light modulator is passive light modulator, it is assumed that light modulator is not adjusted temporarily.Switch K1 is closed, and switch K2 is disconnected.When
When current generating module 1242 disconnects, resistance R5 both end voltages are 0V.When current generating module 1242 provides electric current, resistance R5
There is voltage value in both ends.The voltage at the both ends resistance R5 i.e. the first sampled signal Vs1.First sampled signal Vs1 is produced with electric current
Give birth to the consistent voltage signal of the curent change of module 1242.Signal generator module 1243 can be sentenced according to the first sampled signal Vs1
The state of breaking is passive light modulator.
After detecting light modulator type, signal generator module 1243 provides switch control signal Vsw, to control sampling
The on off state of the selecting switch J1 to Jn in switch K1 and K2 and current generating module 1242 in module 1241.It is preferred that
Ground, when light modulator is PWM light modulators, current generating module 1242 disconnects, and switch K1 is disconnected, and switch K2 is closed, and can be prevented
Follower transmits square wave distortion；When light modulator be active direct current light modulator when, current generating module 1242 disconnect, switch K1 or
As long as any one closure of switch K2；When light modulator is passive light modulator, current generating module 1242 provides electric current, opens
K1 closure switch K2 is closed to disconnect.Alternatively, certain specific occasions, the combination of switch K1, switch K2 and current generating module 1242
Mode can arbitrarily change.
Further, the first potential-divider network that the first potential-divider network of resistance R4 and R5 compositions is formed with resistance R6 and R7 is simultaneously
Connection connection.First sampled signal Vs1 and the second sampled signal Vs2 are corresponding.Second sampled signal Vs2 passes through low-pass filtering, uses
In the average value for characterizing the first sampled signal Vs1.Therefore, the amplitude of the second sampled signal Vs2 can characterize dim signal Vadj
Average value.
In this embodiment, signal generator module U1 can generate brightness control signal according to the second sampled signal Vs2
Vctrl.For example, generating the pwm signal of corresponding duty ratio according to the amplitude of the second sampled signal Vs2.Therefore, signal generator module
Dim signal Vadj is converted into the brightness control signal Vctrl of regulating style, such as pwm signal.
In alternate embodiments, signal generator module U1 can generate brightness control letter according to the first sampled signal Vs1
Number Vctrl.For example, generating the pwm signal of corresponding duty ratio according to the duty ratio of the first sampled signal Vs1.
Fig. 6 shows the pass of dim signal and brightness control signal according to the LED drive device of the utility model embodiment
It is curve.In this embodiment, dim signal Vadj is the d. c. voltage signal using 0-10V direct current light modulators.
As described above, light modulation conversion module 124 receives dim signal Vadj, further generated according to dim signal Vadj bright
Degree control signal Vctrl.Power conversion module 122 adjusts output voltage, output electricity under the control of brightness control signal Vctrl
At least one of stream and duty ratio.In this embodiment, brightness control signal Vctrl is that light modulation conversion module 124 generates
Pulse-width signal.
In this embodiment, dim signal Vadj is d. c. voltage signal, and amplitude is consistent with light modulation data.Light modulation turns
Dim signal Vadj is converted into pulse-width signal by mold changing block 124, to generate brightness control signal Vctrl.Believe in light modulation
When the amplitude of number Vadj is less than 1V, the duty ratio of brightness control signal Vctrl is, for example, scheduled minimum duty cycle, such as 5%.
When the amplitude of dim signal Vadj is more than or equal to 1V and is less than or equal to 9V, the duty ratio of brightness control signal Vctrl and light modulation
The amplitude of signal Vadj is directly proportional.When the amplitude of dim signal Vadj is more than 9V, the duty ratio of brightness control signal Vctrl
It is such as scheduled saturation duty ratio, such as 100%.
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 process including a series of elements, article or equipment include not only those elements, but also
Including other elements that are not explicitly listed, or further include for this process, article or the intrinsic element of equipment.
Do not have in the case of more limiting, the element limited by sentence "including a ...", it is not excluded that including the element
There is also other identical elements in process, article or equipment.
It is as described above according to the embodiments of the present invention, these embodiments there is no all details of detailed descriptionthe,
The specific embodiment that the utility model is only described is not limited yet.Obviously, as described above, many modification and change can be made
Change.These embodiments are chosen and specifically described to this specification, is in order to preferably explain the principles of the present invention and actually to answer
With to enable skilled artisan to utilize the utility model and repairing on the basis of the utility model well
Change use.The utility model is limited only by the claims and their full scope and equivalents.
Claims (23)
1. a kind of light modulation conversion module, which is characterized in that including：
Sampling module, for being sampled to the dim signal that light modulator generates to obtain signal waveform and light modulation data；And
Signal generator module controls signal for generating second switch according to the signal waveform, and according to the light modulation number
According to generation brightness control signal.
2. light modulation conversion module according to claim 1, which is characterized in that the light modulator is passive light modulator, described
Dimming conversion module further includes：
Current generating module, for providing constant current to the passive light modulator to generate the dim signal.
3. light modulation conversion module according to claim 2, which is characterized in that the current generating module includes multiple electric currents
Branch, each current branch include a current source being connected in series with and a selecting switch.
4. light modulation conversion module according to claim 2, which is characterized in that the sampling module includes：
The in-phase input end of operational amplifier, the operational amplifier receives the dim signal, inverting input and output end
Connection, to form follower；
The first end of first switch and the second switch, the first switch is connected to the output end of the operational amplifier,
The second of the first end reception dim signal of the second switch, the second end of the first switch and the second switch
End is connected to public first node；
First potential-divider network and the second potential-divider network, are connected in parallel between the first node and ground, provide first respectively and adopt
Sample signal and the second sampled signal；And
Low-pass filter is connected to second potential-divider network, is filtered to second sampled signal,
Wherein, first sampled signal and second sampled signal characterize the signal waveform and the light modulation number respectively
According to.
5. light modulation conversion module according to claim 4, which is characterized in that the first switch and the second switch point
It Wei not be selected from any one of bipolar transistor and metal oxide semiconductor field effect tube.
6. light modulation conversion module according to claim 4, which is characterized in that the type of the light modulator is selected from PWM tune
At least one of the active direct current light modulator of light device, 0-10V and the passive light modulators of 0-10V.
7. light modulation conversion module according to claim 6, which is characterized in that the second switch control signal is used for basis
The on off state of first switch and the second switch and the current generating module described in the Type Control of the light modulator
Working condition.
8. light modulation conversion module according to claim 7, which is characterized in that when identifying the type of the light modulator, institute
It states light modulation conversion module and works in one of following pattern：
First mode, the current generating module are disconnected with the light modulator, and the first switch is closed, and the second switch is disconnected
It opens；
Second mode, the current generating module provide the constant current to the light modulator, and the first switch disconnects, institute
State second switch closure；And
The third mode, the current generating module are connect with the light modulator, and the first switch is closed, and the second switch is disconnected
It opens.
9. light modulation conversion module according to claim 8, which is characterized in that when identifying the type of the light modulator, institute
It states light modulation conversion module and executes following operation：
If the signal generator module detects the electricity of the dim signal in any of first mode and second mode
Pressure value then further judges the light modulator for PWM light modulators and active direct current tune according to the wave characteristics of the dim signal
One of light device,
If the tune is not detected in any of the first mode and the second mode in the signal generator module
The voltage value of optical signal, and detect in the third mode voltage value of the dim signal, then judge the light modulation
Device is passive light modulator.
10. light modulation conversion module according to claim 1, which is characterized in that the brightness control signal is pwm signal,
And it is consistent that data are dimmed described in the duty ratio of the pwm signal.
11. light modulation conversion module according to claim 1, which is characterized in that the brightness control signal is DC voltage
Signal, and the amplitude of the d. c. voltage signal is consistent with the light modulation data.
12. a kind of LED drive device, which is characterized in that including：
Rectifier bridge, for by AC-input voltage rectification to obtain DC bus-bar voltage；
Conversion module is dimmed, including：Sampling module, for being sampled the dim signal that light modulator generates to obtain signal wave
Shape and light modulation data；And signal generator module, control signal, Yi Jigen for generating second switch according to the signal waveform
Brightness control signal is generated according to the light modulation data；
Control module controls signal for generating first switch according to the brightness control signal；And
The DC bus-bar voltage is converted into direct current output by power conversion module for controlling signal according to the first switch
Signal, to transmit electric energy to LED light,
The power conversion module controls electric energy transmission according to the brightness control signal, to adjust the brightness of the LED light.
13. LED drive device according to claim 12, which is characterized in that the light modulator is passive light modulator, described
Dimming conversion module further includes：
Current generating module, for providing constant current to the passive light modulator to generate the dim signal.
14. LED drive device according to claim 13, wherein the current generating module includes multiple current branch,
Each current branch includes a current source being connected in series with and a selecting switch.
15. LED drive device according to claim 13, which is characterized in that the sampling module includes：
The in-phase input end of operational amplifier, the operational amplifier receives the dim signal, inverting input and output end
Connection, to form follower；
The first end of first switch and the second switch, the first switch is connected to the output end of the operational amplifier,
The second of the first end reception dim signal of the second switch, the second end of the first switch and the second switch
End is connected to public first node；
First potential-divider network and the second potential-divider network, are connected in parallel between the first node and ground, provide first respectively and adopt
Sample signal and the second sampled signal；And
Low-pass filter is connected to second potential-divider network, is filtered to second sampled signal,
First sampled signal and second sampled signal characterize the signal waveform and the light modulation data respectively.
16. LED drive device according to claim 15, which is characterized in that the first switch and the second switch
Respectively it is selected from any one of bipolar transistor and metal oxide semiconductor field effect tube.
17. LED drive device according to claim 15, which is characterized in that the type of the light modulator is selected from PWM tune
At least one of the active direct current light modulator of light device, 0-10V and the passive light modulators of 0-10V.
18. LED drive device according to claim 17, which is characterized in that the second switch control signal is used for root
The on off state and the electric current of first switch and the second switch described in Type Control according to the light modulator generate mould
The working condition of block.
19. LED drive device according to claim 18, which is characterized in that when identifying the type of the light modulator, institute
It states light modulation conversion module and works in one of following pattern：
First mode, the current generating module are disconnected with the light modulator, and the first switch is closed, and the second switch is disconnected
It opens；
Second mode, the current generating module provide the constant current to the light modulator, and the first switch disconnects, institute
State second switch closure；And
The third mode, the current generating module are connect with the light modulator, and the first switch is closed, and the second switch is disconnected
It opens.
20. LED drive device according to claim 19, which is characterized in that when identifying the type of the light modulator, institute
It states light modulation conversion module and executes following operation：
If the signal generator module detects the electricity of the dim signal in any of first mode and second mode
Pressure value then further judges the light modulator for PWM light modulators and active direct current tune according to the wave characteristics of the dim signal
One of light device,
If the tune is not detected in any of the first mode and the second mode in the signal generator module
The voltage value of optical signal, and detect in the third mode voltage value of the dim signal, then judge the light modulation
Device is passive light modulator.
21. LED drive device according to claim 12, which is characterized in that the brightness control signal is pwm signal,
And it is consistent that data are dimmed described in the duty ratio of the pwm signal.
22. LED drive device according to claim 12, which is characterized in that the brightness control signal is DC voltage
Signal, and the amplitude of the d. c. voltage signal is consistent with the light modulation data.
23. LED drive device according to claim 12, which is characterized in that the power conversion module has booster type
At least one of topology, buck topology, buck-boost type topology and reverse exciting topological.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721764843.4U CN207783208U (en) | 2017-12-15 | 2017-12-15 | Dim conversion module, LED drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721764843.4U CN207783208U (en) | 2017-12-15 | 2017-12-15 | Dim conversion module, LED drive device |
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| Publication Number | Publication Date |
|---|---|
| CN207783208U true CN207783208U (en) | 2018-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721764843.4U Active CN207783208U (en) | 2017-12-15 | 2017-12-15 | Dim conversion module, LED drive device |
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| Country | Link |
|---|---|
| CN (1) | CN207783208U (en) |
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