CN207184865U - A kind of LED drive device and its analog light-adjusting circuit - Google Patents

A kind of LED drive device and its analog light-adjusting circuit Download PDF

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Publication number
CN207184865U
CN207184865U CN201720750115.1U CN201720750115U CN207184865U CN 207184865 U CN207184865 U CN 207184865U CN 201720750115 U CN201720750115 U CN 201720750115U CN 207184865 U CN207184865 U CN 207184865U
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China
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oxide
semiconductor
metal
voltage
module
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CN201720750115.1U
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Chinese (zh)
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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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Abstract

The utility model discloses a kind of LED drive device and its analog light-adjusting circuit, 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, voltage shifts processing is carried out again to the simulation dim signal after voltage shifts are handled by debiasing module, is at simulating dimmer voltage domain;Constant current source module exports LED control electric currents according to the simulation dim signal after secondary voltage translation processing, by carrying out secondary voltage translation processing to simulation dim signal, the voltage relationship that regulation translates processing twice is at simulating dimmer voltage domain, 0% ~ 100% dimming scope can be achieved, widened LED dimming scope.

Description

A kind of LED drive device and its analog light-adjusting circuit

Technical field

Technical field of LED illumination is the utility model is related to, more particularly to a kind of LED drive device and its simulation light modulation electricity Road.

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, 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 causes perseverance Stream output has very big error.Using above-mentioned light adjusting circuit, dimming scope can only accomplish 5% ~ 100%, can not realize 0% ~ 100% Dimming scope, so as to influence the usage experience of terminal client.

Thus prior art could be improved and improve.

Utility model content

In view of in place of above-mentioned the deficiencies in the prior art, the purpose of this utility model be to provide a kind of LED drive device and Its analog light-adjusting circuit, by carrying out secondary voltage translation processing to simulation dim signal, regulation translates the voltage of processing twice Relation is at simulating dimmer voltage domain, and 0% ~ 100% dimming scope can be achieved, widened LED dimming scope.

In order to achieve the above object, the utility model 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 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 simulating dimmer voltage domain;Constant current source module is according to through two Simulation dim signal output LED control electric currents after secondary voltage shifts processing.

In the analog light-adjusting circuit of described LED drive device, the prebias module and debiasing module are successively to mould Intend the processing of voltage shifts twice that dim signal is carried out and meets predeterminated voltage relation, when to make simulation dim signal be 0V, LED is controlled 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 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 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 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, obtains second voltage signal.

In the analog light-adjusting circuit of described 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 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 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 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, 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, the source electrode of second metal-oxide-semiconductor connect VDD feeder ears, second metal-oxide-semiconductor with substrate Grid connect the second metal-oxide-semiconductor drain electrode, the grid of the 3rd metal-oxide-semiconductor and the substrate of the 4th metal-oxide-semiconductor;The source of 3rd metal-oxide-semiconductor Pole connects VDD feeder ears, the substrate of drain electrode the 5th metal-oxide-semiconductor of connection of the 3rd 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 of the drain electrode connection constant current source module of 5th metal-oxide-semiconductor, perseverance is also connected by the 4th resistance 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 Connect the source electrode and ground of high-voltage MOS pipe, the grid of the output end connection high-voltage MOS pipe of second operational amplifier;The height The drain electrode of pressure metal-oxide-semiconductor connects the negative pole of LED string to be dimmed.

In the analog light-adjusting circuit of described LED drive device, second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and 5th metal-oxide-semiconductor is P-channel metal-oxide-semiconductor.

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 connect simulation light modulation electricity by LED series winding Road, the analog light-adjusting circuit are also grounded by sampling resistor.

Compared to prior art, in LED drive device and its analog light-adjusting circuit provided by the utility model, the LED The analog light-adjusting circuit of drive device includes prebias module, debiasing module and constant current source module;By prebias module to mould Intend dim signal and carry out voltage shifts processing, the simulation dim signal after voltage shifts are handled is entered again by debiasing module The processing of row voltage shifts, it is at simulating dimmer voltage domain;Constant current source module is according to the mould after secondary voltage translation processing Intend dim signal output LED control electric currents, by carrying out secondary voltage translation processing to simulation dim signal, regulation translates twice The voltage relationship of processing is at simulating dimmer voltage domain, and 0% ~ 100% dimming scope can be achieved, widened LED light modulation Scope.

Brief 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 preferred embodiment of LED drive device first provided by the utility model.

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

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

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

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

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

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

Embodiment

In view of the shortcomings of can not realizing gamut light modulation in the prior art, the purpose of this utility model is to provide one kind LED drive device and its analog light-adjusting circuit, by carrying out secondary voltage translation processing to simulation dim signal, regulation is put down twice The voltage relationship for moving processing is at simulating dimmer voltage domain, and 0% ~ 100% dimming scope can be achieved, widened LED tune Optical range.

To make the purpose of this utility model, technical scheme and effect clearer, clear and definite, develop simultaneously implementation referring to the drawings The utility model is further described example.It should be appreciated that specific embodiment described herein is only explaining this practicality It is new, it is not used to limit the utility model.

Referring to Fig. 2, the LED drive device that the preferred embodiment of the utility model first provides includes LED string 11, is used for The sampling resistor R5 that is carried out by the rectification module 12 of rectification and is sampled to the electric current of LED string 11 for input AC electricity, in addition to For adjusting the analog light-adjusting circuit 13 of the electric current of LED string 11, the input connection alternating current of the rectification module 12 is described whole The output end of flow module 12 connects analog light-adjusting circuit 13 by LED string 11, and the analog light-adjusting circuit 13 also passes through sampling Resistance 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 full model Enclose 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 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 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 to simulation dim signal by prebias module 10, debiasing module 20 is to 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 secondary voltage translation processing 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, and when to make simulation dim signal be 0V, LED control electric currents are also 0, are subtracted The error of the small output current of constant current source module 30,0% ~ 100% dimming scope is realized, conventional dimming apparatus is solved and is unable to reach The defects of 0% light modulation, preferably light modulation experience is brought to user.

Specifically, reference unit 101 and superpositing unit are included also referring to Fig. 3 and Fig. 4, the prebias module 10 102, 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 now reference unit 101 exports Reference voltage carries out voltage shifts according to the reference voltage by superpositing unit 102 to 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 of one end connection simulation dim signal of the first resistor R1, it is the input of prebias module 10 IN is held, the control terminal of the other end connection debiasing module 20 of the first resistor R1, 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 pass through the parallel connection of addition and subtraction circuit, i.e. first resistor R1 and second resistance R2 afterwards to second resistance R2 one end Circuit, the VALG signals of input and reference voltage Vref 1 are overlapped, obtain one and VALG signals and reference voltage The first related Vref1 output voltage V1, its numerical value are, i.e., now to VALG signals First time voltage shifts have been carried out to handle 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 exports the second equivalent output voltage to electricity according to the size of the first output voltage V1 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 the first electric current I1 related to simulation dim signal, and current lens unit 203 is carried out to the first electric current I1 afterwards A default times mirror image processing obtains the second electric current I2, and now debiasing module 20 exports two paths of signals, and signal is current mirror list all the way Member 203 directly exports first voltage signal VFA to constant current source module 30, and another way signal is that first voltage signal passes through debiasing Unit 204 exports second voltage signal VFB to constant current source module 30 and sampling resistor R5 after carrying out voltage shifts processing again, permanent Flow source module 30 and LED control electric currents are exported according to the simulation dim signal after the processing of voltage shifts twice, and by sampling electricity 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 dims.

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 also 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, it is the control of debiasing module 20 End CTRL processed, the inverting input of 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 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 connect VDD feeder ears with substrate, and the grid of the second metal-oxide-semiconductor M2 connects 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 input of the drain electrode connection constant current source module 30 of the 5th metal-oxide-semiconductor M5, also pass 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 are 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 exports is same Phase input, carry out voltage follow by the first operational amplifier A 1 so that its output is defeated to second above 3rd resistor R3 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, obtains believing with VALG Number the first related electric current I1, its value are, afterwards current lens unit 203 obtained with default times mirror image first electric current I1 To the second electric current I2, 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 Three resistance R3 and the 4th resistance R4 value is the 10 of sampling resistor R55Times, and two reference voltage Vref 1 and Vref2 are basic Quite, therefore the electric current in sampling resistor R5 and the electric current in LED string 11 are essentially identical, and the electric current of LED string 11 can be achieved Sampling, the numerical value are:, only need Ensure that the voltage that debiasing module 20 and prebias module 10 translate meets certain relation, specific voltage relationship is Vref2/Vref1=M* (R4/R3) * [R1/ (R1+R2)], then regulation of the electric current from 0% to 100% can be achieved, it is achieved thereby that entirely Scope dims.

Further, Fig. 6 and Fig. 7 are referred to, the LED drive device that the preferred embodiment of the utility model second provides is same Including LED string 11, for carrying out the rectification module 12 of rectification to input AC electricity and the electric current of LED string 11 being sampled Sampling resistor R5, in addition to for adjusting the analog light-adjusting circuit 13 of the electric current of LED string 11, the input of the rectification module 12 Alternating current is connected, the output end of the rectification module 12 connects analog light-adjusting circuit 13, the simulation light modulation by LED string 11 Circuit 13 is 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, it is with the first preferred embodiment difference, the output end of the prebias module 10 directly controls perseverance 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 does not reconnect in constant current source module 30 Second source U2 positive pole, the in-phase input end of the first operational amplifier A 1 does not reconnect prebias module in 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 second preferred embodiment provided by the utility model, Vref1 and Vref2 are two reference voltages, outside input D. c. voltage signal VALG be simulation dim signal, prebias module 10 passes through to input signal VALG and reference voltage Vref1 is overlapped, and obtains a first output voltage V1 related to input signal VALG and reference voltage Vref 1, and it is counted It is worth and is

And in debiasing module 20, made by the first operational amplifier A 1 and the first metal-oxide-semiconductor M1 voltage follower formed Obtain the voltage above 3rd resistor R3 and be equal to input voltage Vref2, this voltage produces pressure drop on 3rd resistor R3, forms first Electric current I1, its value are, afterwards by by the second metal-oxide-semiconductor M2, the 3rd 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, 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, exports two-way voltage signal afterwards to constant current source module 30, wherein first voltage signal VFA is connected to the inverting input of the second operational amplifier, and short spy is continued according to operational amplifier Property obtains;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, because The electric current in electric current and LED in this R5 is essentially identical, and numerical value is , need to only ensure that the voltage that debiasing module 20 and prebias module 10 translate meets certain relation, specific voltage relationship is Vref2/Vref1=R1*R3/ [(R1+R2) * M*R4], then regulation of the electric current from 0% to 100% can be achieved, it is achieved thereby that full model Enclose light modulation.

Correspondingly, the utility model also provides a kind of simulation light-dimming method of LED drive device, as shown in figure 8, described The simulation light-dimming method of LED drive device comprises the following steps:

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

S200, by debiasing module voltage shifts are carried out again to the simulation dim signal after voltage shifts are handled Reason, it is at simulating dimmer voltage domain;

S300, constant current source module export LED control electric currents according to the simulation dim signal after secondary voltage translation processing.

The utility model correspondingly provides a kind of analog light-adjusting circuit of LED drive device, due to above to the mould Intend light adjusting circuit to be described in detail, be no longer described in detail herein.

In summary, in LED drive device and its analog light-adjusting circuit provided by the utility model, the LED drivings dress The analog light-adjusting circuit put includes prebias module, debiasing module and constant current source module;Simulation is dimmed by prebias module Signal carries out voltage shifts processing, and voltage is carried out again to the simulation dim signal after voltage shifts are handled by debiasing module Translation is handled, and is at simulating dimmer voltage domain;Constant current source module dims according to the simulation after secondary voltage translation processing Signal output LED control electric currents, by carrying out secondary voltage translation processing to simulation dim signal, regulation translation processing twice Voltage relationship is at simulating dimmer voltage domain, and 0% ~ 100% dimming scope can be achieved, widened LED dimming scope.

It is understood that for those of ordinary skills, can according to the technical solution of the utility model and The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement should all belong to appended by the utility model Scope of the claims.

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 simulating dimmer voltage domain;Constant current source module root LED control electric currents are exported according to the simulation dim signal after secondary voltage translation processing.
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, adjusts simulation 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 to superpositing unit, 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 terminal of the other end connection debiasing module of the first resistor, also pass 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 input of the output end connection constant current source module of the current lens unit, constant current is also connected by 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, the source electrode of second metal-oxide-semiconductor connects VDD with substrate Feeder ear, the grid of second metal-oxide-semiconductor connect drain electrode, the grid of the 3rd metal-oxide-semiconductor and the lining of the 4th metal-oxide-semiconductor of the second metal-oxide-semiconductor Bottom;The source electrode of 3rd metal-oxide-semiconductor connects VDD feeder ears with substrate, 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 input of the drain electrode connection constant current source module of 5th metal-oxide-semiconductor, go 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 the 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 analog light-adjusting circuit of LED drive device according to claim 7, it is characterised in that second metal-oxide-semiconductor, 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor are P-channel metal-oxide-semiconductor.
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 1-9 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 are led to Cross LED series winding and connect analog light-adjusting circuit, the analog light-adjusting circuit is also grounded by sampling resistor.
CN201720750115.1U 2017-06-26 2017-06-26 A kind of LED drive device and its analog light-adjusting circuit CN207184865U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107277974A (en) * 2017-06-26 2017-10-20 深圳市晟碟半导体有限公司 A kind of LED drive device and its analog light-adjusting circuit, simulation light-dimming method
CN108880254A (en) * 2018-08-20 2018-11-23 电子科技大学 A kind of pre-biased circuit applied to DC-DC converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107277974A (en) * 2017-06-26 2017-10-20 深圳市晟碟半导体有限公司 A kind of LED drive device and its analog light-adjusting circuit, simulation light-dimming method
CN108880254A (en) * 2018-08-20 2018-11-23 电子科技大学 A kind of pre-biased circuit applied to DC-DC converter

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