CN107277974A - A kind of LED drive device and its analog light-adjusting circuit, simulation light-dimming method - Google Patents
A kind of LED drive device and its analog light-adjusting circuit, simulation light-dimming method Download PDFInfo
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- 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
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Abstract
The invention discloses a kind of LED drive device and its analog light-adjusting circuit, simulation light-dimming method, wherein, the analog light-adjusting circuit of the LED drive device includes prebias module, debiasing module and constant current source module；Voltage shifts processing is carried out to simulation dim signal by prebias module, by debiasing module to being handled through voltage shifts after simulation dim signal carry out voltage shifts processing again, be at simulation dimmer voltage domain；Constant current source module exports LED control electric currents according to the simulation dim signal after being handled through secondary voltage translation, by carrying out secondary voltage translation processing to simulation dim signal, the voltage relationship that regulation translates processing twice is at simulation dimmer voltage domain, 0% ~ 100% dimming scope can be achieved, LED dimming scope has been widened.
Description
Technical field
The present invention relates to technical field of LED illumination, more particularly to a kind of LED drive device and its analog light-adjusting circuit, mould
Intend light-dimming method.
Background technology
In LED simulation light modulations field, as shown in figure 1, it is traditional light modulating device, DC voltage input signal VALG warps
After overvoltage follower, the in-phase input end of constant-current source circuit is output to, the size of constant-current source circuit output current is controlled.When straight
When flowing voltage input signal VALG close to 0V, the DC current gain of voltage follower and constant-current source circuit is drastically reduced, and causes perseverance
Stream output has very big error.Using above-mentioned light adjusting circuit, dimming scope can only accomplish 5% ~ 100%, it is impossible to realize 0% ~ 100%
Dimming scope, so as to influence the usage experience of terminal client.
Thus prior art could be improved and improve.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of LED drive device and its mould
Intend light adjusting circuit, simulation light-dimming method, by being carried out to simulation dim signal at secondary voltage translation processing, regulation translation twice
The voltage relationship of reason is at simulation dimmer voltage domain, and 0% ~ 100% dimming scope can be achieved, LED light modulation model has been widened
Enclose.
In order to achieve the above object, this invention takes following technical scheme：
A kind of analog light-adjusting circuit of LED drive device, it includes prebias module, debiasing module and constant current source module；By
Prebias module to simulation dim signal carry out voltage shifts processing, by debiasing module to being handled through voltage shifts after simulation
Dim signal carries out voltage shifts processing again, is at simulation dimmer voltage domain；Constant current source module is according to through secondary voltage
Simulation dim signal output LED control electric currents after translation processing.
In the analog light-adjusting circuit of described LED drive device, the prebias module and debiasing module are successively to mould
The processing of voltage shifts twice for intending dim signal progress meets predeterminated voltage relation, when making simulation dim signal for 0V, LED controls
Electric current is also 0.
In the analog light-adjusting circuit of described LED drive device, the prebias module includes reference unit and superposition is single
Member, the reference unit output reference voltage is to superpositing unit, and the superpositing unit is according to reference voltage to simulation dim signal
The first output voltage is exported after carrying out voltage shifts.
In the analog light-adjusting circuit of described LED drive device, the debiasing module includes voltage follow unit, electric current
Sampling unit, current lens unit and debiasing unit, voltage follow unit is according to the size of first output voltage output etc.
Second output voltage of value obtains the first electric current to current sampling unit through current sampling unit sampling；By current lens unit pair
First electric current carries out a default times mirror image processing and obtains the second electric current, and exports first voltage signal to constant current source module and go
Bias unit；The debiasing unit carries out electricity again according to the first voltage signal and the second electric current to simulation dim signal
Shifting processing is flattened, second voltage signal is obtained.
In the analog light-adjusting circuit of described LED drive device, the reference unit includes the first power supply, the superposition list
Member includes first resistor and second resistance；The input of one end connection simulation dim signal of the first resistor, described first
The control end of the other end connection debiasing module of resistance, the positive pole that the first power supply is also connected by second resistance；Described first
The negative pole ground connection of power supply.
In the analog light-adjusting circuit of described LED drive device, the voltage follow unit includes the first operational amplifier,
The current sampling unit includes 3rd resistor, and the debiasing unit includes the 4th resistance, and the debiasing module also includes
First metal-oxide-semiconductor, the in-phase input end of first operational amplifier connects the output end of superpositing unit, first operation amplifier
The inverting input of device is grounded, is also connected with the source electrode of the first metal-oxide-semiconductor, the output of first operational amplifier by 3rd resistor
The grid of the first metal-oxide-semiconductor of end connection；The input of the drain electrode connection current lens unit of first metal-oxide-semiconductor；The current mirror list
The input of the output end connection constant current source module of member, the output end and ground that constant current source module is also connected by the 4th resistance.
In the analog light-adjusting circuit of described LED drive device, the current lens unit includes the second metal-oxide-semiconductor, the 3rd MOS
Pipe, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor, source electrode and substrate the connection VDD feeder ears of second metal-oxide-semiconductor, second metal-oxide-semiconductor
Grid connect the substrate of the drain electrode of the second metal-oxide-semiconductor, the grid of the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor；The source of 3rd metal-oxide-semiconductor
Pole and substrate connection VDD feeder ears, the substrate of drain electrode the 5th metal-oxide-semiconductor of connection of the 3rd metal-oxide-semiconductor；4th metal-oxide-semiconductor
Source electrode connects VDD feeder ears, and the grid of the 4th metal-oxide-semiconductor connects the drain electrode of the 4th metal-oxide-semiconductor, the grid of the 5th metal-oxide-semiconductor and the
The drain electrode of one metal-oxide-semiconductor；The drain electrode of 5th metal-oxide-semiconductor connects the input of constant current source module, also passes through the 4th resistance connection perseverance
Flow the output end and ground of source module.
In the analog light-adjusting circuit of described LED drive device, the constant current source module includes second source, the second computing
Amplifier and high-voltage MOS pipe, the positive pole of the second source connect the in-phase input end of the second operational amplifier, second electricity
The negative pole ground connection in source；The inverting input of second operational amplifier connects the drain electrode of the 5th metal-oxide-semiconductor, also passes through the 4th resistance
The source electrode and ground of high-voltage MOS pipe are connected, the output end of second operational amplifier connects the grid of high-voltage MOS pipe；The height
The drain electrode of pressure metal-oxide-semiconductor connects the negative pole of LED string to be dimmed.
A kind of simulation light-dimming method of LED drive device, it comprises the following steps：
A, by prebias module to simulation dim signal carry out voltage shifts processing；
B, by debiasing module to being handled through voltage shifts after simulation dim signal carry out voltage shifts processing again, make at it
In simulation dimmer voltage domain；
C, constant current source module export LED control electric currents according to the simulation dim signal after being handled through secondary voltage translation.
A kind of LED drive device, including LED string, for input AC electricity carry out rectification rectification module and to LED
The sampling resistor that lamp string stream is sampled, wherein, the LED drive device also includes analog light-adjusting circuit as described above,
The input connection alternating current of the rectification module, the output end of the rectification module connects simulation light modulation electricity by LED series winding
Road, the analog light-adjusting circuit is also grounded by sampling resistor.
Compared to prior art, the LED drive device provided and its analog light-adjusting circuit of the invention, simulation light-dimming method
In, the analog light-adjusting circuit of the LED drive device includes prebias module, debiasing module and constant current source module；By pre- inclined
Put module to simulation dim signal carry out voltage shifts processing, by debiasing module to being handled through voltage shifts after simulation dim
Signal carries out voltage shifts processing again, is at simulation dimmer voltage domain；Constant current source module is translated according to through secondary voltage
Simulation dim signal output LED control electric currents after processing, by carrying out secondary voltage translation processing to simulation dim signal, are adjusted
The voltage relationship that section translates processing twice is at simulation dimmer voltage domain, and 0% ~ 100% dimming scope can be achieved, widens
LED dimming scope.
Brief description of the drawings
Fig. 1 is the circuit diagram of LED light modulating devices in the prior art.
The schematic diagram for the preferred embodiment of LED drive device first that Fig. 2 provides for the present invention.
The circuit diagram of the preferred embodiment of analog light-adjusting circuit first for the LED drive device that Fig. 3 provides for the present invention.
Prebias module in the preferred embodiment of analog light-adjusting circuit first for the LED drive device that Fig. 4 provides for the present invention
Circuit diagram.
Debiasing module in the preferred embodiment of analog light-adjusting circuit first for the LED drive device that Fig. 5 provides for the present invention
Circuit diagram.
The schematic diagram for the preferred embodiment of LED drive device second that Fig. 6 provides for the present invention.
The circuit diagram of the preferred embodiment of analog light-adjusting circuit second for the LED drive device that Fig. 7 provides for the present invention.
The flow chart of the simulation light-dimming method for the LED drive device that Fig. 8 provides for the present invention.
Embodiment
In view of can not realize the shortcomings of gamut is dimmed in the prior art, it is an object of the invention to provide a kind of LED drives
Dynamic device and its analog light-adjusting circuit, simulation light-dimming method, by carrying out secondary voltage translation processing to simulation dim signal, are adjusted
The voltage relationship that section translates processing twice is at simulation dimmer voltage domain, and 0% ~ 100% dimming scope can be achieved, widens
LED dimming scope.
To make the purpose of the present invention, technical scheme and effect clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention
Limit the present invention.
Referring to Fig. 2, the LED drive device that the first preferred embodiment of the invention is provided includes LED string 11, for defeated
The sampling resistor R5 for entering the rectification module 12 of alternating current progress rectification and being sampled to the electric current of LED string 11, in addition to for
Adjust the analog light-adjusting circuit 13 of the electric current of LED string 11, the input connection alternating current of the rectification module 12, the rectification mould
The output end of block 12 connects analog light-adjusting circuit 13 by LED string 11, and the analog light-adjusting circuit 13 also passes through sampling resistor
R5 is grounded, and is accurately controlled the electric current of LED string 11 according to simulation dim signal by analog light-adjusting circuit 13, is realized gamut i.e.
0% ~ 100% dimming scope.In the present embodiment, the rectification module 12 is rectifier bridge.
Specifically, the analog light-adjusting circuit 13 includes prebias module 10, debiasing module 20 and constant current source module 30,
The input IN input simulation dim signals of the prebias module 10, the output end OUT connections of the prebias module 10 are gone
The control end CTRL of biasing module 20, the input of the first output end FA connection constant currents source module 30 of the debiasing module 20
End, the output end of the second output end FB connection constant currents source module 30 of the debiasing module 20, is also connect by sampling resistor R5
Ground.Voltage shifts processing is carried out by 10 pairs of simulation dim signals of prebias module, 20 pairs of debiasing module is through voltage shifts afterwards
Simulation dim signal after processing carries out voltage shifts processing again, and the voltage relationship that regulation translates processing twice dims simulation
Signal is in simulation dimmer voltage domain,；Constant current source module 30 is defeated according to the simulation dim signal after being handled through secondary voltage translation
Go out LED control electric currents, can be according to circuit actual conditions due to successively having carried out voltage shifts processing twice to simulation dim signal
Adjust the relation between voltage shifts twice so that the prebias module and debiasing module are entered to simulation dim signal successively
The capable processing of voltage shifts twice meets predeterminated voltage relation, when making simulation dim signal for 0V, and LED control electric currents are also 0, are subtracted
The error of the small output current of constant current source module 30, realize 0% ~ 100% dimming scope, solve conventional dimming apparatus and be unable to reach
The defect of 0% light modulation, preferably light modulation experience is brought to user.
Specifically, also referring to Fig. 3 and Fig. 4, the prebias module 10 includes reference unit 101 and superpositing unit
102, the reference unit 101 connects superpositing unit 102, and the superpositing unit 102 connects the control end of debiasing module 20, outside
The d. c. voltage signal VALG of portion's input is input to superpositing unit 102 as simulation dim signal, and now reference unit 101 is exported
Reference voltage carries out voltage shifts according to the reference voltage by superpositing unit 102 to superpositing unit 102 to simulation dim signal
Exported after processing in one first output voltage, the present embodiment, the prebias module 10 realizes voltage by addition and subtraction circuit
Translation is handled.
Wherein, the reference unit 101 includes the first power supply U1, and the superpositing unit 102 includes first resistor R1 and the
Two resistance R2；The input of one end connection simulation dim signal of the first resistor R1, it is the input of prebias module 10
IN is held, the other end of the first resistor R1 connects the control end of debiasing module 20, also passes through second resistance R2 connections first
Power supply U1 positive pole, it is the output end OUT of prebias module 10；The negative pole ground connection of the first power supply U1.
When it is implemented, VALG signals are inputted to one end of the first resistor R1, the reference electricity of the first power supply U1 outputs
Vref1 is pressed to second resistance R2 one end, afterwards by addition and subtraction circuit, i.e. first resistor R1 and second resistance R2 parallel connection
Circuit, the VALG signals and reference voltage Vref 1 of input are overlapped, one and VALG signals and reference voltage is obtained
The first related Vref1 output voltage V1, its numerical value is, i.e., now to VALG
Signal has carried out the processing of first time voltage shifts and has obtained the first output voltage V1.
Further, please refer to fig. 5, the debiasing module 20 includes voltage follow unit 201, current sample list
Member 202, current lens unit 203 and debiasing unit 204, the connection of voltage follow unit 201 superpositing unit 102, electric current are adopted
Sample unit 202 and current lens unit 203, the current lens unit 203 are also connected with debiasing unit 204 and constant current source module 30.
102 pairs of simulation dim signals of superpositing unit export the first output voltage V1 to voltage follow unit after carrying out voltage shifts processing
201, the voltage follow unit 201 exports the second equivalent output voltage to electricity according to the size of the first output voltage V1
Flow the equal in magnitude of sampling unit 202, the i.e. size of the second output voltage and the first output voltage V1, after through current sample list
Member 202 obtains the first electric current I1 related to simulation dim signal, and 203 pairs of current lens unit the first electric current I1 is carried out afterwards
A default times mirror image processing obtains the second electric current I2, the now output of debiasing module 20 two paths of signals, and signal is current mirror list all the way
The directly output first voltage signal VFA of member 203 is to constant current source module 30, and another road signal is that first voltage signal passes through debiasing
Unit 204 carries out exporting again second voltage signal VFB after voltage shifts processing to constant current source module 30 and sampling resistor R5, permanent
Flow source module 30 and LED control electric currents are exported according to the simulation dim signal after being handled through voltage shifts twice, and pass through electricity of sampling
Resistance R5 samples to the electric current of LED string 11, due to having carried out prebias and debiasing twice successively to simulation dim signal
Voltage shifts processing, makes the adjustability of simulation dim signal higher, realizes that gamut is dimmed.
Wherein, the voltage follow unit 201 includes the first operational amplifier A 1, and the current sampling unit 202 includes
3rd resistor R3, the debiasing unit 204 includes the 4th resistance R4, and the debiasing module 20 also includes the first metal-oxide-semiconductor M1,
The in-phase input end of first operational amplifier A 1 connects the output end of superpositing unit 102, and it is the control of debiasing module 20
End CTRL processed, the inverting input of first operational amplifier A 1 is grounded by 3rd resistor R3, is also connected with the first metal-oxide-semiconductor M1
Source electrode, the output end of first operational amplifier A 1 connects the first metal-oxide-semiconductor M1 grid；The leakage of the first metal-oxide-semiconductor M1
Pole connects the input of current lens unit 203；The input of the output end connection constant current source module 30 of the current lens unit 203
End, as the first output end FA of debiasing module 20, current lens unit 203 also passes through the 4th resistance R4 connection constant current source modules
30 output end and sampling resistor R5 one end, as the second output end FB of debiasing module 20, the sampling resistor R5's
The other end is grounded.In the present embodiment, the first metal-oxide-semiconductor M1 is N-channel MOS pipe.
The current lens unit 203 includes the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4 and the 5th metal-oxide-semiconductor
M5, the second metal-oxide-semiconductor M2 source electrode and substrate connection VDD feeder ears, the grid of the second metal-oxide-semiconductor M2 connect the 2nd MOS
The substrate of pipe M2 drain electrode, the 3rd metal-oxide-semiconductor M3 grid and the 4th metal-oxide-semiconductor M4；The source electrode and substrate of the 3rd metal-oxide-semiconductor M3 connects
Connect VDD feeder ears, the 5th metal-oxide-semiconductor M5 of drain electrode connection of the 3rd metal-oxide-semiconductor M3 substrate；The source electrode of the 4th metal-oxide-semiconductor M4
Connect VDD feeder ears, the grid of the 4th metal-oxide-semiconductor M4 connect the 4th metal-oxide-semiconductor M4 drain electrode, the 5th metal-oxide-semiconductor M5 grid and
First metal-oxide-semiconductor M1 drain electrode；The drain electrode of the 5th metal-oxide-semiconductor M5 connects the input of constant current source module 30, also passes through the 4th electricity
Hinder the output end and ground of R4 connection constant currents source module 30.In the present embodiment, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th
Metal-oxide-semiconductor M4 and the 5th metal-oxide-semiconductor M5 is P-channel metal-oxide-semiconductor.
Further, the constant current source module 30 includes second source U2, the second operational amplifier A 2 and high-voltage MOS pipe
M6, the second source U2 positive pole connect the in-phase input end of the second operational amplifier A 2, the negative pole of the second source U2
Ground connection, exports another operational amplifier A of reference voltage Vref 2 to the second 2；The anti-phase input of second operational amplifier A 2
The 5th metal-oxide-semiconductor M5 of end connection drain electrode, the source electrode also by the 4th resistance R4 connection high-voltage MOS pipes M6 and one using resistance
End, the output end connection high-voltage MOS pipe M6 of second operational amplifier A 2 grid；The drain electrode of the high-voltage MOS pipe M6 connects
Receive the negative pole of the LED string 11 of light modulation.That is two output ends of debiasing module 20, first output end FA connection second is transported
Amplifier A2 inverting input is calculated, and the second output end then connects high-voltage MOS pipe M6 source electrode and sampling resistor R5 one end,
In the present embodiment, the high-voltage MOS pipe M6 is N-channel MOS pipe.
When it is implemented, first the first operational amplifier A of output voltage V1 input values 1 that prebias module 10 is exported is same
Phase input, carries out voltage follow so that its output is defeated to second above 3rd resistor R3 by the first operational amplifier A 1
Go out the value that voltage is equal to the first output voltage V1, the second output voltage produces pressure drop on 3rd resistor R3, obtain believing with VALG
Number the first related electric current I1, its value is, current lens unit 203 is with default times mirror image first electric current I1 afterwards
The second electric current I2 is obtained, such as when the preset multiple of the current lens unit 203 is 1：During M, then the second electric current exported is, the second electric current I2 produced on the 4th resistance R4 pressure drop output second voltage signal VFB, realize debiasing,
So as to carry out secondary voltage translation processing to simulation dim signal, because the first output end FA of debiasing module 20 is connected to the
The anti-phase input of two operational amplifier As 2, it can be seen from the empty short characteristic of operational amplifier, now first voltage signal VFA
Value is equal to the value of another reference voltage Vref 2, i.e.,, and the second output end FB is then connected to sampling resistor
R5 one end, then second voltage signal VFB value be, due to R3, R4>>R5, in practice
3rd resistor R3 and the 4th resistance R4 value are the 10 of sampling resistor R55Times, and two reference voltage Vrefs 1 and Vref2 bases
This quite, therefore electric current in sampling resistor R5 and electric current in LED string 11 are essentially identical, the achievable electric current of LED string 11
Sampling, the numerical value is：, only
It need to ensure that the voltage that debiasing module 20 and prebias module 10 are translated meets certain relation, specific voltage relationship is
Vref2/Vref1=M* (R4/R3) * [R1/ (R1+R2)], then can be achieved electric current from 0% to 100% regulation, it is achieved thereby that entirely
Scope is dimmed.
Further, Fig. 6 and Fig. 7 are referred to, the LED drive device that the second preferred embodiment of the invention is provided equally includes
LED string 11, the sampling for input AC electricity to be carried out the rectification module 12 of rectification and sampled to the electric current of LED string 11
Resistance R5, in addition to for adjusting the analog light-adjusting circuit 13 of the electric current of LED string 11, the input connection of the rectification module 12
Alternating current, the output end of the rectification module 12 connects analog light-adjusting circuit 13, the analog light-adjusting circuit by LED string 11
13 are also grounded by sampling resistor R5.
In second preferred embodiment, the analog light-adjusting circuit equally includes prebias module 10, the and of debiasing module 20
Constant current source module 30, is, the output end of the prebias module 10 directly controls perseverance with the first preferred embodiment difference
Flow source module 30, i.e., described prebias module 10 input IN input simulation dim signal, the prebias module 10 it is defeated
Go out to hold the 1st end of OUT connection constant currents source module 30, i.e. positive input, the first output end FA of the debiasing module 20 connects
Connect the 2nd end of constant current source module 30, i.e. inverting input, the second output end FB connection constant-current source moulds of the debiasing module 20
The output end of block 30, also it is grounded by sampling resistor R5.
In the present embodiment, the prebias module 10, the circuit structure of debiasing module 20 and constant current source module 30 and
Split-phase is same in the middle part of one preferred embodiment, and here is omitted for the component and the annexation of same section specifically included, with
First preferred embodiment difference is that the in-phase input end of second operational amplifier A 2 is not reconnected in constant current source module 30
The in-phase input end of first operational amplifier A 1 does not reconnect prebias module in second source U2 positive pole, debiasing module 20
The middle first resistor R1 other end；The positive pole of the second source U2 connects the homophase input of first operational amplifier A 1
End, second source U2 negative pole ground connection；The other end of the first resistor R1 connects the same phase of second operational amplifier A 2
Input.
In the second preferred embodiment that the present invention is provided, Vref1 and Vref2 are two reference voltages, outside input it is straight
It is simulation dim signal to flow voltage signal VALG, and prebias module 10 to input signal VALG and reference voltage Vref 1 by entering
Row superposition, obtains a first output voltage V1 related with reference voltage Vref 1 to input signal VALG, its numerical value is。
And in debiasing module 20, caused by the first operational amplifier A 1 and the first metal-oxide-semiconductor M1 voltage follower constituted
Voltage above 3rd resistor R3 is equal to input voltage Vref2, and this voltage produces pressure drop on 3rd resistor R3, forms the first electric current
I1, its value is, afterwards by by the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4 and the 5th metal-oxide-semiconductor
The current mirror of M5 compositions obtains the second electric current I2, its value is with the first electric current I1 described in M times of mirror image, second
Electric current I2 produces pressure drop on the 4th resistance R4, realizes debiasing, and two-way voltage signal is exported afterwards to constant current source module 30, its
Middle first voltage signal VFA is connected to the inverting input of the second operational amplifier, and continuing short characteristic according to operational amplifier obtains
Arrive；Second voltage signal VFB is connected to sampling resistor R5 top, and its value is, due to
R3、R4>>R5, R3, R4 value are the 10 of sampling resistor R5 in practice5Times, and Vref1 and Vref2 is substantially suitable, therefore R5
In electric current and LED in electric current it is essentially identical, numerical value is,
It need to only ensure that the voltage that debiasing module 20 and prebias module 10 are translated meets certain relation, specific voltage relationship is
Vref2/Vref1=R1*R3/ [(R1+R2) * M*R4], then can be achieved electric current from 0% to 100% regulation, it is achieved thereby that full model
Enclose light modulation.
Correspondingly, the present invention also provides a kind of simulation light-dimming method of LED drive device, as shown in figure 8, the LED drives
The simulation light-dimming method of dynamic device comprises the following steps：
S100, by prebias module to simulation dim signal carry out voltage shifts processing；
S200, by debiasing module to being handled through voltage shifts after simulation dim signal carry out voltage shifts processing again, make
It is in simulation dimmer voltage domain；
S300, constant current source module export LED control electric currents according to the simulation dim signal after being handled through secondary voltage translation.
The present invention correspondingly provides a kind of analog light-adjusting circuit of LED drive device, due to being adjusted to the simulation above
Optical circuit is described in detail, and is no longer described in detail herein.
In summary, it is described in the LED drive device provided and its analog light-adjusting circuit of the invention, simulation light-dimming method
The analog light-adjusting circuit of LED drive device includes prebias module, debiasing module and constant current source module；By prebias module pair
Simulate dim signal carry out voltage shifts processing, by debiasing module to being handled through voltage shifts after simulation dim signal again
Voltage shifts processing is carried out, simulation dimmer voltage domain is at；After constant current source module through secondary voltage translation according to handling
Dim signal output LED control electric currents are simulated, by carrying out secondary voltage translation processing to simulation dim signal, regulation is put down twice
The voltage relationship for moving processing is at simulation dimmer voltage domain, and 0% ~ 100% dimming scope can be achieved, LED tune has been widened
Optical range.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (10)
1. a kind of analog light-adjusting circuit of LED drive device, it is characterised in that including prebias module, debiasing module and perseverance
Flow source module；Voltage shifts processing is carried out to simulation dim signal by prebias module, by debiasing module to through voltage shifts
Simulation dim signal after processing carries out voltage shifts processing again, is at simulation dimmer voltage domain；Constant current source module root
LED control electric currents are exported according to the simulation dim signal after being handled through secondary voltage translation.
2. the analog light-adjusting circuit of LED drive device according to claim 1, it is characterised in that the prebias module
Predeterminated voltage relation is met to the processing of voltage shifts twice that simulation dim signal is carried out successively with debiasing module, simulation is adjusted
When optical signal is 0V, LED control electric currents are also 0.
3. the analog light-adjusting circuit of LED drive device according to claim 1, it is characterised in that the prebias module
Including reference unit and superpositing unit, the reference unit output reference voltage is to superpositing unit, and the superpositing unit is according to ginseng
Examine after voltage carries out voltage shifts to simulation dim signal and export the first output voltage.
4. the analog light-adjusting circuit of LED drive device according to claim 3, it is characterised in that the debiasing module
Including voltage follow unit, current sampling unit, current lens unit and debiasing unit, voltage follow unit is according to described first
Second output voltage of the size output equivalence of output voltage obtains first to current sampling unit through current sampling unit sampling
Electric current；A default times mirror image processing is carried out to first electric current by current lens unit and obtains the second electric current, and exports first voltage
Signal is to constant current source module and debiasing unit；The debiasing unit is according to the first voltage signal and the second electric current to mould
Intend dim signal and carry out voltage shifts processing again, obtain second voltage signal.
5. the analog light-adjusting circuit of LED drive device according to claim 3, it is characterised in that the reference unit bag
The first power supply is included, the superpositing unit includes first resistor and second resistance；One end connection simulation light modulation of the first resistor
The input of signal, the control end of the other end connection debiasing module of the first resistor, also passes through second resistance connection the
The positive pole of one power supply；The negative pole ground connection of first power supply.
6. the analog light-adjusting circuit of LED drive device according to claim 4, it is characterised in that the voltage follow list
Member includes the first operational amplifier, and the current sampling unit includes 3rd resistor, and the debiasing unit includes the 4th resistance,
The debiasing module also includes the first metal-oxide-semiconductor, and the in-phase input end of first operational amplifier connects the defeated of superpositing unit
Go out end, the inverting input of first operational amplifier is grounded, be also connected with the source electrode of the first metal-oxide-semiconductor, institute by 3rd resistor
The output end for stating the first operational amplifier connects the grid of the first metal-oxide-semiconductor；The drain electrode connection current lens unit of first metal-oxide-semiconductor
Input；The output end of the current lens unit connects the input of constant current source module, also passes through the connection constant current of the 4th resistance
The output end and ground of source module.
7. the analog light-adjusting circuit of LED drive device according to claim 6, it is characterised in that the current lens unit
Including the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor, source electrode and substrate the connection VDD of second metal-oxide-semiconductor
Feeder ear, the grid of second metal-oxide-semiconductor connects the lining of drain electrode, the grid of the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor of the second metal-oxide-semiconductor
Bottom；Source electrode and substrate the connection VDD feeder ears of 3rd metal-oxide-semiconductor, drain electrode the 5th metal-oxide-semiconductor of connection of the 3rd metal-oxide-semiconductor
Substrate；The source electrode connection VDD feeder ears of 4th metal-oxide-semiconductor, the drain electrode of grid the 4th metal-oxide-semiconductor of connection of the 4th metal-oxide-semiconductor,
The drain electrode of the grid and the first metal-oxide-semiconductor of 5th metal-oxide-semiconductor；The drain electrode of 5th metal-oxide-semiconductor connects the input of constant current source module, gone back
The output end and ground of constant current source module are connected by the 4th resistance.
8. the analog light-adjusting circuit of LED drive device according to claim 7, it is characterised in that the constant current source module
Including second source, the second operational amplifier and high-voltage MOS pipe, the positive pole of the second source connects the second operational amplifier
In-phase input end, the negative pole ground connection of the second source；The inverting input of second operational amplifier connects the 5th metal-oxide-semiconductor
Drain electrode, also pass through source electrode and ground that the 4th resistance connects high-voltage MOS pipe, the output end connection of second operational amplifier is high
Press the grid of metal-oxide-semiconductor；The drain electrode of the high-voltage MOS pipe connects the negative pole of LED string to be dimmed.
9. the simulation light-dimming method of a kind of LED drive device, it is characterised in that comprise the following steps：
A, by prebias module to simulation dim signal carry out voltage shifts processing；
B, by debiasing module to being handled through voltage shifts after simulation dim signal carry out voltage shifts processing again, make at it
In simulation dimmer voltage domain；
C, constant current source module export LED control electric currents according to the simulation dim signal after being handled through secondary voltage translation.
10. a kind of LED drive device, including LED string, for carrying out the rectification module of rectification and to LED to input AC electricity
The sampling resistor that lamp string stream is sampled, it is characterised in that the LED drive device is also included as claim 1-8 is any
Analog light-adjusting circuit described in one, the input connection alternating current of the rectification module, the output end of the rectification module is led to
Cross LED series winding and connect analog light-adjusting circuit, the analog light-adjusting circuit is also grounded by sampling resistor.
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