CN104955248B - A kind of piece-wise linear constant current LED drive circuit of low EMI - Google Patents
A kind of piece-wise linear constant current LED drive circuit of low EMI Download PDFInfo
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Abstract
The invention discloses a kind of piece-wise linear constant current LED drive circuit of low EMI, it includes rectification circuit and LED string, first output end of rectification circuit is connected with input detection module and LED string wire, input detection module is connected with EMI control module wires, reference voltage module is connected with EMI control module wires, EMI control modules output end is connected with constant-current controller module wire, and LED string negative terminal is connected with constant-current controller module wire；The piece-wise linear constant current LED drive circuit of prior art is solved during the full-wave rectified voltage cyclically-varying of input, due to the mutation process that there is voltage and current when each segmentation starts, therefore there is more obvious EMI in the drive circuit, the problems such as had a strong impact on the service life of LED.
Description
Technical field
The invention belongs to electronic circuit technology, more particularly to a kind of piece-wise linear constant current LED drive circuit of low EMI.
Background technology
LED be it is a kind of under several volts of forward voltage can normal work and luminous device, by
The optical characteristics of LED understands that LED light spectrum will change, and LED light flux increases therewith, i.e., with the increase of forward current
Brightness increases.Luminosity and spectrum for control LED etc. generally need an electric current for stabilization.LED drive circuit presses work
Principle can be divided into switch drive and linear constant current drives.Metal-oxide-semiconductor in switch driving circuit is operated in HF switch state and whole
Individual circuit is complex, and the adjustment pipe of drive circuit is operated in continuous state in linear constant current drive circuit, rather than being operated in
The on off state of saturation and cut-off region, and required peripheral components are fewer than switch drive.Latter of which is directly driven for alternating current
It is dynamic, and be to reach power factor and efficiency higher higher, generate piece-wise linear constant current LED drive circuit.Segmentation
Formula linear constant current LED drive circuit input full-wave rectified voltage cyclically-varying during, due to it is each segmentation open
There is the mutation process of voltage and current during the beginning, therefore there is more obvious EMI in the drive circuit, had a strong impact on LED
The service life of lamp.
The content of the invention
The technical problem to be solved in the present invention：A kind of piece-wise linear constant current LED drive circuit of low EMI is provided, to solve
Certainly the piece-wise linear constant current LED drive circuit of prior art input full-wave rectified voltage cyclically-varying during,
Due to the mutation process that there is voltage and current when each segmentation starts, therefore the drive circuit is in the presence of more obvious
EMI, the problems such as had a strong impact on the service life of LED.
Technical solution of the present invention：
A kind of piece-wise linear constant current LED drive circuit of low EMI, it includes rectification circuit and LED string, rectification circuit
The first output end be connected with input detection module and LED string wire, input detection module and EMI control modules wire company
Connect, reference voltage module is connected with EMI control module wires, EMI control modules output end connects with constant-current controller module wire
Connect, LED string negative terminal is connected with constant-current controller module wire.
Second output end of the rectification circuit and the earth terminal ground connection of constant-current controller module.
The rectification circuit includes the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4,
Alternating message source one end connects the negative electrode of the first diode D1 and the anode of the second diode D2, the connection of the alternating message source other end
The negative electrode of the 3rd diode D3 and the anode of the 4th diode D4, the negative electrode of the second diode D2 connect the moon of the 4th diode D4
Pole, the anode of the first diode D1 connects the anode of the 3rd diode D3 and is connected to the ground.
The input detection module includes first resistor R1, second resistance R2, the first resistor R1 and second resistance R2
Series connection, the first resistor R1 and second resistance R2 tie points as detection output, the first resistor R1 other end conducts
Detection input, the second resistance R2 other ends ground connection.
The reference voltage module include first, second, and third PMOS MP1, MP2 and MP3, the first amplifier AMP1,
The 3rd resistor pnp triode of R3, the 4th resistance R4, first, second, and third Q1, Q2 and Q3, first, second, and third PMOS
The grid of pipe MP1, MP2 and MP3 is connected to the output end of the first amplifier AMP1, the source connection electricity of MP1, MP2 and MP3 together
The colelctor electrode and base stage of source VCC, first, second, and third pnp triode Q1, Q2 and Q3 are grounded, the pole of the first pnp three
The emitter stage of pipe Q1 connects the drain electrode of the first PMOS MP1 and connects the reversed-phase output of the first amplifier AMP1, the second pnp
The emitter stage connection 3rd resistor R3 of triode Q2, the drain electrode of 3rd resistor R3 other ends connection MP2 is simultaneously connected to the first amplification
The in-phase input end of device AMP1, the emitter stage of the 3rd pnp triode Q3 connects the 4th resistance R4, and the 4th resistance R4 other ends connect
Connect the drain electrode of the 3rd PMOS MP3 and as reference voltage module output end.
The EMI control modules are including the second amplifier AMP2, with two the 3rd to the 8th amplifier AMP3 of anode
To AMP8, the first NMOS tube MN1, the 4th to the 7th PMOS MP4 to MP7 and the 5th to the tenth resistance R5 to R10, second amplifies
Device AMP2 in-phase end input reference voltages, reverse input end connects the source and the 6th resistance R6, the 6th of the first NMOS tube NM1
The other end ground connection of resistance R6, the second amplifier out connects the grid of the first NMOS tube MN1, the 4th and the 5th PMOS
The source connection power supply VCC of MP4 and MP5, grid connects drain electrode and the 5th resistance R5, the 5th resistance R5 of the 6th PMOS MP6
The other end connect drain electrode and the six, the 7th PMOS MP6, the grid of MP7, the four, the 5th PMOSs of the first NMOS tube NM1
The drain electrode of MP4, MP5 connects the six, the 7th PMOS MP6 respectively, and the source electrode of MP7, the drain electrode of the 7th PMOS MP7 is sequentially connected in series
Resistance R7, R8, R9, are grounded after R10, and the 3rd amplifier AMP3 and the 4th amplifier AMP4, the 5th amplifier AMP5 is put with the 6th
Big device AMP6, the 7th amplifier AMP7 and the 8th amplifier AMP8 are respectively two voltage followers for concatenating, the 3rd amplifier
AMP3, the 5th amplifier Amp5, the 7th amplifier AMP7 are input into for NMOS tube, and the first positive input difference connecting node
V3 ', V2 ' and V1 ', the output end of the second positive input connection voltage detection module, the 4th amplifier AMP4, the 6th amplifier
AMP6 and the 8th amplifier AMP8 is input into for PMOS, and the first positive input difference connecting node V4, V3 ' and V2 '.
The constant-current controller module and LED string include first to fourth LED light string LED1 extremely
The NMOS tube MN2 to MN5 of LED4, the 9th to the 12nd amplifier AMP9 to AMP12, second to the 5th and inspection leakage resistance Rsense,
The in-phase input end difference connecting node V1 to V4 of the 9th to the 12nd amplifier AMP9 to AMP12, the 9th to the 12nd amplifies
The inverting input of device AMP9 to AMP12 is connected inspection leakage resistance together with the source electrode of the second to the 5th NMOS tube MN2 to MN5
Rsense, inspection leakage resistance Rsense other end ground connection, the 9th to the 12nd amplifier AMP9 to AMP12 output ends connect two respectively
To the grid of the 5th NMOS tube MN2 to MN5, first to fourth LED light string LED1 to LED4 is sequentially connected in series, and its is each
Negative electrode connects the drain electrode of the second to the 5th NMOS tube MN2 to MN5, the anode connection rectification circuit of the first LED string LED1 respectively
Input voltage.
Beneficial effects of the present invention：
The present invention is used to for alternating voltage to be converted to full-wave rectified voltage by rectification circuit；Used by being input into detection module
In detection input voltage value, it is controlled in order to most LED current；By EMI control modules come according to different input voltages
Instantaneous value produces the setting voltage of control LED current, and the module finally determines LED current waveform；By reference voltage module, use
In the reference voltage needed for generation；The voltage obtained by constant-current controller realizes the precise control to LED current；Solve existing
There is the piece-wise linear constant current LED drive circuit of technology during the full-wave rectified voltage cyclically-varying of input, due to
There is the mutation process of voltage and current when each segmentation starts, therefore there is more obvious EMI in the drive circuit, sternly
The problems such as have impact on the service life of LED again.
Brief description of the drawings：
Fig. 1 is Current Voltage control effect schematic diagram of the invention；
Fig. 2 is schematic block diagram of the invention；
Fig. 3 is the structural representation of alternating current source input and rectifier bridge；
Fig. 4 is the structural representation for being input into detection module；
Fig. 5 is reference voltage module principle structural representation；
Fig. 6 is EMI control module theory structure schematic diagrams；
Fig. 7 is the structural representation that constant-current controller connects with LED series winding.
Specific embodiment：
A kind of piece-wise linear constant current LED drive circuit of low EMI, it includes（See Fig. 1）Rectification circuit and LED string,
First output end of rectification circuit is connected with input detection module and LED string wire, is input into detection module and EMI control modules
Wire is connected, and reference voltage module is connected with EMI control module wires, EMI control modules output end and constant-current controller module
Wire is connected, and LED string negative terminal is connected with constant-current controller module wire.
Second output end of the rectification circuit and the earth terminal ground connection of constant-current controller module.
Rectification circuit is used to for alternating voltage to be converted to full-wave rectified voltage；By be input into detection module for detect input
Magnitude of voltage, is controlled in order to most LED current；Produced according to the instantaneous value of different input voltages by EMI control modules
The setting voltage of LED current is controlled, the module finally determines LED current waveform；By reference voltage module, needed for for producing
Reference voltage；The voltage obtained by constant-current controller realizes the precise control to LED current.
Detection is input into Fig. 1 and represents input detection module, EMI controls represent EMI control modules, and reference voltage represents benchmark
Voltage module.
The rectification circuit includes the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4,
Alternating message source one end connects the negative electrode of the first diode D1 and the anode of the second diode D2, the connection of the alternating message source other end
The negative electrode of the 3rd diode D3 and the anode of the 4th diode D4, the negative electrode of the second diode D2 connect the moon of the 4th diode D4
Pole, the anode of the first diode D1 connects the anode of the 3rd diode D3 and is connected to the ground.When the alternating message source has voltage
During input, the negative electrode of the second diode D2 and the 4th diode D4 will export full-wave rectified voltage, and as subordinate
Supply voltage.
The input detection module includes first resistor R1, second resistance R2, the first resistor R1 and second resistance R2
Series connection, the first resistor R1 and second resistance R2 tie points as detection output, the first resistor R1 other end conducts
Detection input, the second resistance R2 other ends ground connection.The variation characteristic of the VIN voltage of input will be embodied on OUT signal.
The reference voltage module include first, second, and third PMOS MP1, MP2 and MP3, the first amplifier AMP1,
The 3rd resistor pnp triode of R3, the 4th resistance R4, first, second, and third Q1, Q2 and Q3, first, second, and third PMOS
The grid of pipe MP1, MP2 and MP3 is connected to the output end of the first amplifier AMP1, the source connection electricity of MP1, MP2 and MP3 together
The colelctor electrode and base stage of source VCC, first, second, and third pnp triode Q1, Q2 and Q3 are grounded, the pole of the first pnp three
The emitter stage of pipe Q1 connects the drain electrode of the first PMOS MP1 and connects the reversed-phase output of the first amplifier AMP1, the second pnp
The emitter stage connection 3rd resistor R3 of triode Q2, the drain electrode of 3rd resistor R3 other ends connection MP2 is simultaneously connected to the first amplification
The in-phase input end of device AMP1, the emitter stage of the 3rd pnp triode Q3 connects the 4th resistance R4, and the 4th resistance R4 other ends connect
Connect the drain electrode of the 3rd PMOS MP3 and as reference voltage module output end.The first amplifier AMP1 is positive by clamping
The voltage of input and inverting input so that the voltage of the 3rd resistor R3 is equal to, described the first ~ the
Three PMOS MP1 ~ MP3 electric currents are equal toIt is positive temperature coefficient, adjusts suitable parameter, output reference voltageIt is zero temperature.Certainly, reference voltage module can be the reference voltage product of other arbitrary structures
Raw circuit.
Wherein：The diode forward pressure drop between the base stage and emitter stage of triode Q1 is represented,Represent three
Diode forward pressure drop between the base stage and emitter stage of pole pipe Q2,Represent between the base stage and emitter stage of triode Q3
Diode forward pressure drop.
The EMI control modules are including the second amplifier AMP2, with two the 3rd to the 8th amplifier AMP3 of anode
To AMP8, the first NMOS tube MN1, the 4th to the 7th PMOS MP4 to MP7 and the 5th to the tenth resistance R5 to R10, second amplifies
Device AMP2 in-phase end input reference voltages, reverse input end connects the source and the 6th resistance R6, the 6th of the first NMOS tube NM1
The other end ground connection of resistance R6, the second amplifier out connects the grid of the first NMOS tube MN1, the 4th and the 5th PMOS
The source connection power supply VCC of MP4 and MP5, grid connects drain electrode and the 5th resistance R5, the 5th resistance R5 of the 6th PMOS MP6
The other end connect drain electrode and the six, the 7th PMOS MP6, the grid of MP7, the four, the 5th PMOSs of the first NMOS tube NM1
The drain electrode of MP4, MP5 connects the six, the 7th PMOS MP6 respectively, and the source electrode of MP7, the drain electrode of the 7th PMOS MP7 is sequentially connected in series
Resistance R7, R8, R9, are grounded after R10, and the 3rd amplifier AMP3 and the 4th amplifier AMP4, the 5th amplifier AMP5 is put with the 6th
Big device AMP6, the 7th amplifier AMP7 and the 8th amplifier AMP8 are respectively two voltage followers for concatenating, the 3rd amplifier
AMP3, the 5th amplifier Amp5, the 7th amplifier AMP7 are input into for NMOS tube, and the first positive input difference connecting node
V3 ', V2 ' and V1 ', the output end of the second positive input connection voltage detection module, the 4th amplifier AMP4, the 6th amplifier
AMP6 and the 8th amplifier AMP8 is input into for PMOS, and the first positive input difference connecting node V4, V3 ' and V2 '.Its
Output is respectively V3, V2, V1.The electric current of the resistance of negative feedback control the 6th that reference voltage V ref passes through the second amplifier isAnd mirror image is to resistance R7 ~ R9.The voltage at EMI ends is the output voltage for being input into detection module, as input voltage gradually increases
Plus the output voltage V1, V2, V3 of EMI control modules will gradually from V1 ', V2 ', V3 ' change to V2 ', V3 ', V4.
The constant-current controller module and LED string include first to fourth LED light string LED1 extremely
The NMOS tube MN2 to MN5 of LED4, the 9th to the 12nd amplifier AMP9 to AMP12, second to the 5th and inspection leakage resistance Rsense,
The in-phase input end difference connecting node V1 to V4 of the 9th to the 12nd amplifier AMP9 to AMP12, the 9th to the 12nd amplifies
The inverting input of device AMP9 to AMP12 is connected inspection leakage resistance together with the source electrode of the second to the 5th NMOS tube MN2 to MN5
Rsense, inspection leakage resistance Rsense other end ground connection, the 9th to the 12nd amplifier AMP9 to AMP12 output ends connect two respectively
To the grid of the 5th NMOS tube MN2 to MN5, first to fourth LED light string LED1 to LED4 is sequentially connected in series, and its is each
Negative electrode connects the drain electrode of the second to the 5th NMOS tube MN2 to MN5, the anode connection rectification circuit of the first LED string LED1 respectively
Input voltage.
In the present invention due to the voltage, it is described as full-wave rectified voltage gradually rises
MN2, MN3, MN4, MN5 will be turned on one by one, and the LED string electric current will realize the electricity of low EMI in changing as indicated by a broken line in fig. 1
Flow control LED string.
Claims (6)
1. a kind of piece-wise linear constant current LED drive circuit of low EMI, it includes rectification circuit and LED string, rectification circuit
First output end is connected with input detection module and LED string wire, and input detection module is connected with EMI control module wires,
Reference voltage module is connected with EMI control module wires, and EMI control modules output end is connected with constant-current controller module wire,
LED string negative terminal is connected with constant-current controller module wire；It is characterized in that：The EMI control modules include the second amplifier
AMP2, with two the 3rd to the 8th amplifier AMP3 to AMP8, the first NMOS tube MN1, the 4th to the 7th PMOSs of anode
MP4 to MP7 and the 5th to the tenth resistance R5 to R10, the second amplifier AMP2 in-phase end input reference voltages, reverse input end connects
The other end of the source and the 6th resistance R6, the 6th resistance R6 that meet the first NMOS tube NM1 is grounded, and the second amplifier out connects
Connect the grid of the first NMOS tube MN1, the source connection power supply VCC of the 4th and the 5th PMOS MP4 and MP5, grid connection the 6th
The drain electrode of PMOS MP6 and the 5th resistance R5, the other end of the 5th resistance R5 connect the drain electrode of the first NMOS tube NM1 with the 6th,
The grid of the 7th PMOS MP6, MP7, the drain electrode of the four, the 5th PMOS MP4, MP5 connects the six, the 7th PMOSs respectively
The source electrode of MP6, MP7, the drain electrode of the 7th PMOS MP7 is sequentially connected in series resistance R7, R8, R9, is grounded after R10, the 3rd amplifier
AMP3 and the 4th amplifier AMP4, the 5th amplifier AMP5 and the 6th amplifier AMP6, the 7th amplifier AMP7 and the 8th amplify
Device AMP8 is respectively two voltage followers of concatenation, the 3rd amplifier AMP3, the 5th amplifier Amp5, the 7th amplifier
AMP7 is input into for NMOS tube, and the first positive input difference connecting node V3 ', V2 ' and V1 ', the connection of the second positive input
The output end of voltage detection module, the 4th amplifier AMP4, the 6th amplifier AMP6 and the 8th amplifier AMP8 are that PMOS is defeated
Enter, and the first positive input difference connecting node V4, V3 ' and V2 '.
2. the piece-wise linear constant current LED drive circuit of a kind of low EMI according to claim 1, it is characterised in that：It is described
Second output end of rectification circuit and the earth terminal ground connection of constant-current controller module.
3. the piece-wise linear constant current LED drive circuit of a kind of low EMI according to claim 1, it is characterised in that：It is described
Rectification circuit includes the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, alternating message source one
The negative electrode of the first diode D1 of end connection and the anode of the second diode D2, the alternating message source other end connect the 3rd diode D3
Negative electrode and the 4th diode D4 anode, the negative electrode of the second diode D2 connects the negative electrode of the 4th diode D4, the one or two pole
The anode of pipe D1 connects the anode of the 3rd diode D3 and is connected to the ground.
4. the piece-wise linear constant current LED drive circuit of a kind of low EMI according to claim 1, it is characterised in that：It is described
Input detection module includes first resistor R1, second resistance R2, and the first resistor R1 connects with second resistance R2, described first
, with second resistance R2 tie points as detection output, the first resistor R1 other ends are used as detection input, institute for resistance R1
State second resistance R2 other ends ground connection.
5. the piece-wise linear constant current LED drive circuit of a kind of low EMI according to claim 1, it is characterised in that：It is described
Reference voltage module include first, second, and third PMOS MP1, MP2 and MP3, the first amplifier AMP1,3rd resistor R3,
4th resistance R4, first, second, and third pnp triode Q1, Q2 and Q3, first, second, and third PMOS MP1, MP2 and
The grid of MP3 is connected to the output end of the first amplifier AMP1 together, the source connection power supply VCC of MP1, MP2 and MP3, first,
Second and the 3rd pnp triode Q1, Q2 and Q3 colelctor electrode and base stage be grounded, the emitter stage of the first pnp triode Q1
Connect the drain electrode of the first PMOS MP1 and connect the reversed-phase output of the first amplifier AMP1, the hair of the second pnp triode Q2
Emitter-base bandgap grading connects 3rd resistor R3, and the 3rd resistor R3 other ends connect the drain electrode of MP2 and are connected to the same phase of the first amplifier AMP1
Input, the emitter stage of the 3rd pnp triode Q3 connects the 4th resistance R4, and the 4th resistance R4 other ends connect the 3rd PMOS
The drain electrode of MP3 and as reference voltage module output end.
6. the piece-wise linear constant current LED drive circuit of a kind of low EMI according to claim 1, it is characterised in that：It is described
Constant-current controller module and LED string include first to fourth LED light string LED1 to LED4, the 9th to the tenth
Two amplifier AMP9 to AMP12, the second to the 5th NMOS tube MN2 to MN5 and inspection leakage resistance Rsense, the 9th to the 12nd amplifies
The in-phase input end difference connecting node V1 to V4 of device AMP9 to AMP12, the 9th to the 12nd amplifier AMP9's to AMP12 is anti-
Phase input is connected inspection leakage resistance Rsense, inspection leakage resistance Rsense together with the source electrode of the second to the 5th NMOS tube MN2 to MN5
The other end is grounded, and the 9th to the 12nd amplifier AMP9 to AMP12 output ends connect two to the 5th NMOS tube MN2 to MN5 respectively
Grid, first to fourth LED light string LED1 to LED4 is sequentially connected in series, and its each negative electrode connects second to respectively
The drain electrode of five NMOS tube MN2 to MN5, the anode of the first LED string LED1 connects the input voltage of rectification circuit.
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| CN104955248B true CN104955248B (en) | 2017-06-09 |
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| US20100109557A1 (en) * | 2008-11-06 | 2010-05-06 | Osram Sylvania, Inc. | Floating Switch Controlling LED Array Segment |
| CN102235608A (en) * | 2010-05-06 | 2011-11-09 | （株）提尔爱 | LED lamp with adjustable illumination intensity based on AC voltage amplitude |
| US20110273102A1 (en) * | 2010-05-07 | 2011-11-10 | Van De Ven Antony P | Ac driven solid state lighting apparatus with led string including switched segments |
| WO2012144800A2 (en) * | 2011-04-19 | 2012-10-26 | Lee Dong-Il | Led driving device and led driving method using same |
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| CN104955248A (en) | 2015-09-30 |
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Effective date of registration: 20231213 Address after: 550081 Guiyang National High tech Industrial Development Zone National High tech Zone Jinyang Science and Technology Industrial Park Standard Factory Building No.1, 1st Floor, Guiyang City, Guizhou Province Patentee after: GUIZHOU E-CHIP MICROELECTRONICS TECHNOLOGY Co.,Ltd. Address before: No. 12 Duyun Road, Jinyang Science and Technology Industrial Park, National High tech Development Zone, Guiyang City, Guizhou Province, 550025 Patentee before: Li Zehong |