CN107277974B - 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 PDF

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Publication number
CN107277974B
CN107277974B CN201710496076.1A CN201710496076A CN107277974B CN 107277974 B CN107277974 B CN 107277974B CN 201710496076 A CN201710496076 A CN 201710496076A CN 107277974 B CN107277974 B CN 107277974B
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voltage
module
oxide
semiconductor
metal
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CN201710496076.1A
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CN107277974A (en
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刘梦
邓迅升
麦炎全
陈博
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深圳市晟碟半导体有限公司
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B45/00Circuit arrangements for operating light emitting diodes [LED]
    • H05B45/30Driver circuits
    • H05B45/37Converter circuits

Abstract

The invention discloses a kind of LED drive device and its analog light-adjusting circuit, simulation light-dimming methods, 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 treated that simulation dim signal carries out voltage shifts processing again through voltage shifts, is at simulation dimmer voltage domain;According to being translated through secondary voltage, treated simulates dim signal output LED control electric currents to constant current source module, by carrying out secondary voltage translation processing to simulation dim signal, the voltage relationship that adjusting translates processing twice is at simulation dimmer voltage domain, the dimming scope that can be achieved 0% ~ 100%, has widened the dimming scope of LED.

Description

A kind of LED drive device and its analog light-adjusting circuit, simulation light-dimming method

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 Quasi- 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, it is output to the in-phase input end of constant-current source circuit, controls the size of constant-current source circuit output current.When straight When flowing voltage input signal VALG close to 0V, the DC current gain of voltage follower and constant-current source circuit drastically reduces, and leads to perseverance Stream output has very big error.Using above-mentioned light adjusting circuit, dimming scope can only accomplish 5% ~ 100%, cannot achieve 0% ~ 100% Dimming scope, to influence the usage experience of terminal client.

Thus the prior art could be improved and improve.

Invention content

Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of LED drive device and its moulds Quasi- light adjusting circuit, simulation light-dimming method are adjusted by carrying out secondary voltage translation processing to simulation dim signal at translation twice The voltage relationship of reason be at simulation dimmer voltage domain, it can be achieved that 0% ~ 100% dimming scope, widened the light modulation model of LED It encloses.

In order to achieve the above object, this invention takes following technical schemes:

A kind of analog light-adjusting circuit of LED drive device comprising prebias module, debiasing module and constant-current source mould Block;Voltage shifts processing is carried out to simulation dim signal by prebias module, by debiasing module to after voltage shifts are handled Simulation dim signal carry out voltage shifts processing again, be at simulation dimmer voltage domain;Constant current source module is according to through two Secondary voltage shifts treated simulation dim signal output LED control electric current.

In the analog light-adjusting circuit of the LED drive device, the prebias module and debiasing module are successively to mould The processing of voltage shifts twice that quasi- dim signal carries out meets predeterminated voltage relationship, when to make simulation dim signal be 0V, LED controls Electric current is also 0.

In the analog light-adjusting circuit of the LED drive device, the prebias module includes that reference unit and superposition are single Member, the reference unit output reference voltage to superpositing unit, the superpositing unit is according to reference voltage to simulating dim signal The first output voltage is exported after carrying out voltage shifts.

In the analog light-adjusting circuit of the 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 samples through current sampling unit to current sampling unit and obtains the first electric current;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 the LED drive device, the reference unit includes the first power supply, and the superposition is single Member includes first resistor and second resistance;The input terminal of one end connection simulation dim signal of the first resistor, described first The control terminal of the other end connection debiasing module of resistance, the anode that the first power supply is also connected by second resistance;Described first The cathode of power supply is grounded.

In the analog light-adjusting circuit of the 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 further includes First metal-oxide-semiconductor, the output end of the in-phase input end connection superpositing unit of first operational amplifier, first operation amplifier The inverting input of device is grounded by 3rd resistor, is also connected with the source electrode of the first metal-oxide-semiconductor, the output of first operational amplifier The grid of the first metal-oxide-semiconductor of end connection;The input terminal of the drain electrode connection current lens unit of first metal-oxide-semiconductor;The current mirror list The input terminal 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 the 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, the source electrode of second metal-oxide-semiconductor connect VDD feeder ears, second metal-oxide-semiconductor with substrate Grid connect the drain electrode of the second metal-oxide-semiconductor, third metal-oxide-semiconductor grid and the 4th metal-oxide-semiconductor substrate;The source of the third metal-oxide-semiconductor Pole connects VDD feeder ears, the substrate of drain electrode the 5th metal-oxide-semiconductor of connection of the third metal-oxide-semiconductor with substrate;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 input terminal of the drain electrode connection constant current source module of 5th metal-oxide-semiconductor also passes through the 4th resistance connection perseverance Flow the output end and ground of source module.

In the analog light-adjusting circuit of the LED drive device, the constant current source module includes second source, the second operation Amplifier and high-voltage MOS pipe, the in-phase input end of the anode connection second operational amplifier of the second source, second electricity The cathode in source is grounded;The inverting input of the second operational amplifier connects the drain electrode of the 5th metal-oxide-semiconductor, also passes through the 4th resistance Connect the source electrode and ground of high-voltage MOS pipe, the grid of the output end connection high-voltage MOS pipe of the second operational amplifier;The height The drain electrode of pressure metal-oxide-semiconductor connects the cathode of LED light string to be dimmed.

A kind of simulation light-dimming method of LED drive device comprising following steps:

A, voltage shifts processing is carried out to simulation dim signal by prebias module;

B, by debiasing module to through voltage shifts treated simulation dim signal carry out voltage shifts processing again, make It is in simulation dimmer voltage domain;

C, according to being translated through secondary voltage, treated simulates dim signal output LED control electric currents to constant current source module.

A kind of LED drive device, including LED light 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 further includes analog light-adjusting circuit as described above, The input terminal of the rectification module connects alternating current, and the output end of the rectification module connects simulation light modulation electricity by LED light string Road, the analog light-adjusting circuit are also grounded by sampling resistor.

Compared to the prior art, LED drive device and its analog light-adjusting circuit provided by 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 Set module to simulation dim signal carry out voltage shifts processing, by debiasing module to through voltage shifts treated 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 Treated, and simulation dim signal output LED controls electric current, by carrying out secondary voltage translation processing to simulation dim signal, adjusts Section translate twice processing voltage relationship be at simulation dimmer voltage domain, it can be achieved that 0% ~ 100% dimming scope, widen The dimming scope of LED.

Description of the drawings

Fig. 1 is the circuit diagram of LED light modulating devices in the prior art.

Fig. 2 is the schematic diagram of the first preferred embodiment of LED drive device provided by the invention.

Fig. 3 is the circuit diagram of the first preferred embodiment of analog light-adjusting circuit of LED drive device provided by the invention.

Fig. 4 is prebias module in the first preferred embodiment of analog light-adjusting circuit of LED drive device provided by the invention Circuit diagram.

Fig. 5 is debiasing module in the first preferred embodiment of analog light-adjusting circuit of LED drive device provided by the invention Circuit diagram.

Fig. 6 is the schematic diagram of the second preferred embodiment of LED drive device provided by the invention.

Fig. 7 is the circuit diagram of the second preferred embodiment of analog light-adjusting circuit of LED drive device provided by the invention.

Fig. 8 is the flow chart of the simulation light-dimming method of LED drive device provided by the invention.

Specific implementation mode

The shortcomings of in view of cannot achieve gamut light modulation in the prior art, the purpose of the present invention is to provide a kind of LED drives Dynamic device and its analog light-adjusting circuit, simulation light-dimming method are adjusted by carrying out secondary voltage translation processing to simulation dim signal Section translate twice processing voltage relationship be at simulation dimmer voltage domain, it can be achieved that 0% ~ 100% dimming scope, widen The dimming scope of LED.

To make the purpose of the present invention, technical solution 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 described herein, specific examples are only used to explain the present invention, is not used to Limit the present invention.

Referring to Fig. 2, the LED drive device that the first preferred embodiment of the invention provides includes LED light string 11, for defeated Enter the sampling resistor R5 that alternating current carries out the rectification module 12 of rectification and sampled to 11 electric current of LED light string, further includes being used for The analog light-adjusting circuit 13 of 11 electric current of LED light string is adjusted, the input terminal of the rectification module 12 connects alternating current, the rectification mould The output end of block 12 connects analog light-adjusting circuit 13 by LED light string 11, and the analog light-adjusting circuit 13 also passes through sampling resistor R5 is grounded, and accurately controls the electric current of LED light string 11 according to simulation dim signal by analog light-adjusting circuit 13, realizes that gamut is 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 terminal IN input simulation dim signals of the prebias module 10, the output end OUT connections of the prebias module 10 are gone The control terminal 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 terminal FB connection constant currents source module 30 of the debiasing module 20 are also connect by sampling resistor R5 Ground.Voltage shifts processing is carried out to simulation dim signal by prebias module 10, debiasing module 20 is to through voltage shifts later Treated, and simulation dim signal carries out voltage shifts processing again, and the voltage relationship that adjusting translates processing twice makes simulation dim Signal is in simulation dimmer voltage domain,;Constant current source module 30 according to through secondary voltage translation treated simulation dim signal it is defeated Go out LED control electric currents, it, can be according to circuit actual conditions due to successively having carried out voltage shifts processing twice to simulation dim signal Adjust the relationship twice between voltage shifts so that the prebias module and debiasing module successively to simulation dim signal into The capable processing of voltage shifts twice meets predeterminated voltage relationship, and when to make simulation dim signal be 0V, it is 0 that LED, which controls electric current also, is subtracted The error of small 30 output current of constant current source module realizes 0% ~ 100% dimming scope, solves conventional dimming apparatus and be unable to reach The defect of 0% light modulation brings preferably light modulation experience 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 terminal 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 reference unit 101 exports at this time Reference voltage carries out voltage shifts according to the reference voltage to superpositing unit 102, by superpositing unit 102 to simulation dim signal One first output voltage is exported after processing, in 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 terminal of one end connection simulation dim signal of the first resistor R1, is the input of prebias module 10 IN, the control terminal of the other end connection debiasing module 20 of the first resistor R1 is held also to pass through second resistance R2 connections first The anode of power supply U1 is the output end OUT of prebias module 10;The cathode of the first power supply U1 is grounded.

When it is implemented, VALG signals are input to one end of the first resistor R1, the reference electricity of the first power supply U1 outputs It presses Vref1 to one end of second resistance R2, passes through addition and subtraction circuit, the i.e. parallel connection of first resistor R1 and second resistance R2 later The VALG signals of input and reference voltage Vref 1 are overlapped, obtain one and VALG signals and reference voltage by circuit The relevant first output voltage V1 of Vref1, numerical value are, i.e., at this time to VALG Signal has carried out first time voltage shifts and has handled to obtain 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 voltage follow unit 201 connects superpositing unit 102, electric current is 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. Superpositing unit 102 exports the first output voltage V1 to voltage follow unit after carrying out voltage shifts processing to simulation dim signal 201, the voltage follow unit 201 is according to the second equivalent output voltage of the size of the first output voltage V1 output to electricity Flow sampling unit 202, i.e., the size of the second output voltage and the first output voltage V1's is equal in magnitude, after through current sample list Member 202 obtains and simulates the relevant first electric current I1 of dim signal, and current lens unit 203 carries out the first electric current I1 later A default times mirror image processing obtains the second electric current I2, and debiasing module 20 exports two paths of signals at this time, and signal is current mirror list all the way For the directly output first voltage signal VFA of member 203 to constant current source module 30, another way signal is that first voltage signal passes through debiasing Output second voltage signal VFB is permanent to constant current source module 30 and sampling resistor R5 after unit 204 carries out voltage shifts processing again Flow source module 30 according to through voltage shifts twice treated simulation dim signal output LED control electric current, and pass through sample electricity Resistance R5 samples the electric current of LED light string 11, due to having carried out prebias and debiasing twice successively to simulation dim signal Voltage shifts processing, makes the adjustability higher of simulation dim signal, realizes gamut light modulation.

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 include the 4th resistance R4, and the debiasing module 20 further includes the first metal-oxide-semiconductor M1, The output end of the in-phase input end connection superpositing unit 102 of first operational amplifier A 1, is the control of debiasing module 20 The inverting input of end CTRL processed, first operational amplifier A 1 are grounded by 3rd resistor R3, are also connected with the first metal-oxide-semiconductor M1 Source electrode, the output end of first operational amplifier A 1 connects the grid of the first metal-oxide-semiconductor M1;The leakage of the first metal-oxide-semiconductor M1 Pole connects the input terminal 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 One end of 30 output end and sampling resistor R5, as the second output terminal 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, third metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4 and the 5th metal-oxide-semiconductor The source electrode of M5, the second metal-oxide-semiconductor M2 connect VDD feeder ears with substrate, and the grid of the second metal-oxide-semiconductor M2 connects the 2nd MOS The drain electrode of pipe M2, the grid and the 4th metal-oxide-semiconductor M4 of third metal-oxide-semiconductor M3 substrate;The source electrode and substrate of the third metal-oxide-semiconductor M3 connects Connect VDD feeder ears, the substrate of the 5th metal-oxide-semiconductor M5 of drain electrode connection of the third metal-oxide-semiconductor M3;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 drain electrode of the 4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5 grid and The drain electrode of first metal-oxide-semiconductor M1;The input terminal of the drain electrode connection constant current source module 30 of the 5th metal-oxide-semiconductor M5 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, third 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, second operational amplifier A2 and high-voltage MOS pipe The in-phase input end of the anode connection second operational amplifier A2 of M6, the second source U2, the cathode of the second source U2 Ground connection, exports another reference voltage Vref 2 to second operational amplifier A2;The anti-phase input of the second operational amplifier A2 End connects the drain electrode of the 5th metal-oxide-semiconductor M5, also by the source electrode of the 4th resistance R4 connection high-voltage MOS pipes M6 and using the one of resistance End, the grid of the output end connection high-voltage MOS pipe M6 of the second operational amplifier A2;The drain electrode of the high-voltage MOS pipe M6 connects Receive the cathode of the LED light string 11 of light modulation.That is two output ends of debiasing module 20, first output end FA connection second are transported The inverting input of amplifier A2 is calculated, and second output terminal then connects one end of the source electrode and sampling resistor R5 of high-voltage MOS pipe M6, 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 exports is same Phase input terminal 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 generates pressure drop on 3rd resistor R3, obtains believing with VALG Number relevant first electric current I1, value are, current lens unit 203 is to preset times mirror image first electric current I1 later The second electric current I2 is obtained, such as when the preset multiple of the current lens unit 203 is 1:When M, then the second electric current exported is, the second electric current I2 generated on the 4th resistance R4 pressure drop output second voltage signal VFB, realize debiasing, To carry out secondary voltage translation processing to simulation dim signal, since the first output end FA of debiasing module 20 is connected to the The anti-phase input of two operational amplifier As 2, according to the empty short characteristic of operational amplifier it is found that first voltage signal VFA at this time Value is equal to the value of another reference voltage Vref 2, i.e.,, and second output terminal FB is then connected to sampling resistor One end of R5, then the value of second voltage signal VFB be, due to R3, R4>>R5, in practice The value of 3rd resistor R3 and the 4th resistance R4 are the 10 of sampling resistor R55Times, and two reference voltage Vrefs 1 and Vref2 bases This is suitable, therefore the electric current in sampling resistor R5 and the electric current in LED light string 11 are essentially identical, it can be achieved that 11 electric current of LED light string Sampling, which is:, only It need to ensure that the voltage that debiasing module 20 and prebias module 10 translate meets certain relationship, specific voltage relationship is Adjusting of the electric current from 0% to 100% then can be achieved in Vref2/Vref1=M* (R4/R3) * [R1/ (R1+R2)], complete to realize Range dims.

Further, Fig. 6 and Fig. 7 are please referred to, the LED drive device that the second preferred embodiment of the invention provides equally includes LED light string 11, the rectification module 12 for carrying out rectification to input AC electricity and the sampling that 11 electric current of LED light string is sampled Resistance R5 further includes the analog light-adjusting circuit 13 for adjusting 11 electric current of LED light string, the input terminal connection of the rectification module 12 The output end of alternating current, the rectification module 12 connects analog light-adjusting circuit 13, the analog light-adjusting circuit by LED light string 11 13 are also grounded by sampling resistor R5.

In second preferred embodiment, the analog light-adjusting circuit equally includes prebias module 10,20 and of debiasing module Constant current source module 30, the difference is that, the output end of the prebias module 10 directly controls perseverance with the first preferred embodiment Flow source module 30, i.e. the input terminal IN input simulation dim signals of the prebias module 10, the prebias module 10 it is defeated The first output end FA at the 1st end of outlet OUT connection constant currents source module 30, i.e. positive input, the debiasing module 20 connects Connect the 2nd end of constant current source module 30, i.e. inverting input, the second output terminal FB connection constant-current source moulds of the debiasing module 20 The output end of block 30 is also 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 details are not described herein again for the connection relation of the component and same section that include specifically, with First preferred embodiment the difference is that, the in-phase input end of second operational amplifier A2 does not reconnect in constant current source module 30 The anode of second source U2, the in-phase input end of the first operational amplifier A 1 does not reconnect prebias module in debiasing module 20 The other end of middle first resistor R1;The anode of the second source U2 connects the homophase input of first operational amplifier A 1 End, the cathode ground connection of second source U2;The other end of the first resistor R1 connects the same phase of the second operational amplifier A2 Input terminal.

In second preferred embodiment provided by the invention, Vref1 and Vref2 is two reference voltages, externally input straight It is simulation dim signal to flow voltage signal VALG, prebias module 10 by input signal VALG and reference voltage Vref 1 into Row superposition, obtains one and 1 relevant first output voltage V1 of input signal VALG and reference voltage Vref, numerical value is

And in debiasing module 20, made by the voltage follower of the first operational amplifier A 1 and the first metal-oxide-semiconductor M1 compositions It obtains the voltage above 3rd resistor R3 and is equal to input voltage Vref2, this voltage generates pressure drop on 3rd resistor R3, forms first Electric current I1, value are, later by by the second metal-oxide-semiconductor M2, third metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4 and the 5th The current mirror of metal-oxide-semiconductor M5 compositions obtains the second electric current I2, value is with the first electric current I1 described in M times of mirror image , the second electric current I2 generates pressure drop on the 4th resistance R4, realizes debiasing, exports two-way voltage signal later to constant current source module 30, wherein first voltage signal VFA is connected to the inverting input of second operational amplifier, and short spy is continued according to operational amplifier Property obtains;Second voltage signal VFB is connected to the top of sampling resistor R5, and value is, due to R3, R4>>R5, the value of R3, R4 are the 10 of sampling resistor R5 in practice5Times, and Vref1 is substantially suitable with Vref2, therefore the electric current in the electric current and LED in R5 is essentially identical, and numerical value is, only need to ensure debiasing module 20 and the voltage that translates of prebias module 10 meet certain relationship, specific voltage relationship is Vref2/Vref1=R1*R3/ Adjusting of the electric current from 0% to 100% then can be achieved in [(R1+R2) * M*R4], to realize gamut light modulation.

Correspondingly, the present invention also provides a kind of simulation light-dimming methods of LED drive device, as shown in figure 8, the LED drives The simulation light-dimming method of dynamic device includes the following steps:

S100, voltage shifts processing is carried out to simulation dim signal by prebias module;

S200, by debiasing module to through voltage shifts treated simulation dim signal carry out voltage shifts again Reason is at simulation dimmer voltage domain;

Treated simulates dim signal output LED control electric currents according to being translated through secondary voltage for S300, constant current source module.

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 and will not be described here in detail.

In conclusion in LED drive device provided by the invention and its analog light-adjusting circuit, simulation light-dimming method, it is described 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 through voltage shifts treated simulation dim signal again Voltage shifts processing is carried out, simulation dimmer voltage domain is at;Constant current source module is according to through secondary voltage translation, treated It simulates dim signal output LED and controls electric current, by carrying out secondary voltage translation processing to simulation dim signal, adjusting is put down twice Move processing voltage relationship be at simulation dimmer voltage domain, it can be achieved that 0% ~ 100% dimming scope, widened the tune of LED Optical range.

It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills 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 range.

Claims (9)

1. a kind of analog light-adjusting circuit of LED drive device, which is characterized 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 Treated, and simulation dim signal carries out voltage shifts processing again, is at simulation dimmer voltage domain;Constant current source module root According to being translated through secondary voltage, treated simulates dim signal output LED control electric currents;
The prebias module and debiasing module successively meet the processing of voltage shifts twice that simulation dim signal carries out pre- If voltage relationship, make simulation dim signal be 0V when, LED control electric current also be 0.
2. the analog light-adjusting circuit of LED drive device according to claim 1, which is characterized in that the prebias module Including reference unit and superpositing unit, the reference unit output reference voltage to superpositing unit, the superpositing unit is according to ginseng It examines after voltage carries out voltage shifts to simulation dim signal and exports the first output voltage.
3. the analog light-adjusting circuit of LED drive device according to claim 2, which is characterized 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 Quasi- dim signal carries out voltage shifts processing again, obtains second voltage signal.
4. the analog light-adjusting circuit of LED drive device according to claim 2, which is characterized in that the reference unit packet 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 terminal of signal, the control terminal of the other end connection debiasing module of the first resistor also pass through second resistance connection the The anode of one power supply;The cathode of first power supply is grounded.
5. the analog light-adjusting circuit of LED drive device according to claim 3, which is characterized 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 further includes the first metal-oxide-semiconductor, and the in-phase input end of first operational amplifier connects the defeated of superpositing unit The inverting input of outlet, first operational amplifier is grounded by 3rd resistor, is also connected with the source electrode of the first metal-oxide-semiconductor, institute The output end for stating the first operational amplifier connects the grid of the first metal-oxide-semiconductor;The drain electrode of first metal-oxide-semiconductor connects current lens unit Input terminal;The input terminal of the output end connection constant current source module of the current lens unit, also connects constant current by the 4th resistance The output end and ground of source module.
6. the analog light-adjusting circuit of LED drive device according to claim 5, which is characterized in that the current lens unit Including the second metal-oxide-semiconductor, third metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor, the source electrode of second metal-oxide-semiconductor connects VDD with substrate Feeder ear, the grid of second metal-oxide-semiconductor connect the drain electrode of the second metal-oxide-semiconductor, third metal-oxide-semiconductor grid and the 4th metal-oxide-semiconductor source Pole;The source electrode of the third metal-oxide-semiconductor connects VDD feeder ears with substrate, drain electrode the 5th metal-oxide-semiconductor of connection of the third metal-oxide-semiconductor Source electrode;The substrate 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 input terminal of the drain electrode connection constant current source module of 5th metal-oxide-semiconductor is gone back The output end and ground of constant current source module are connected by the 4th resistance.
7. the analog light-adjusting circuit of LED drive device according to claim 6, which is characterized in that the constant current source module Including second source, second operational amplifier and high-voltage MOS pipe, the anode connection second operational amplifier of the second source In-phase input end, the cathode ground connection of the second source;The inverting input of the 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 the second operational amplifier is high Press the grid of metal-oxide-semiconductor;The drain electrode of the high-voltage MOS pipe connects the cathode of LED light string to be dimmed.
8. a kind of simulation light-dimming method of LED drive device, which is characterized in that include the following steps:
A, voltage shifts processing is carried out to simulation dim signal by prebias module;
B, by debiasing module to through voltage shifts treated simulation dim signal carry out voltage shifts processing again, make at its In simulation dimmer voltage domain;
C, according to being translated through secondary voltage, treated simulates dim signal output LED control electric currents to constant current source module;
In the step B, the voltage twice that the prebias module and debiasing module successively carry out simulation dim signal is flat Shifting processing meets predeterminated voltage relationship, make simulation dim signal be 0V when, LED control electric current also be 0.
9. a kind of LED drive device, including LED light string, for carrying out the rectification module of rectification to input AC electricity and to LED light The sampling resistor that string electric current is sampled, which is characterized in that the LED drive device further includes as claim 1-7 is any one The input terminal of analog light-adjusting circuit described in, the rectification module connects alternating current, and the output end of the rectification module passes through LED light string connects analog light-adjusting circuit, and the analog light-adjusting circuit is also grounded by sampling resistor.
CN201710496076.1A 2017-06-26 2017-06-26 A kind of LED drive device and its analog light-adjusting circuit, simulation light-dimming method CN107277974B (en)

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