CN107734777A - LED drive chip, LED drive circuit and LED light device - Google Patents
LED drive chip, LED drive circuit and LED light device Download PDFInfo
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- CN107734777A CN107734777A CN201711101077.8A CN201711101077A CN107734777A CN 107734777 A CN107734777 A CN 107734777A CN 201711101077 A CN201711101077 A CN 201711101077A CN 107734777 A CN107734777 A CN 107734777A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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Abstract
The present invention discloses a kind of LED drive chip, LED drive circuit and LED light device, the LED drive chip includes power input, line voltage compensation input, current settings end, and excess temperature adjustment module, band-gap reference module, operational amplifier, FET, high-voltage circuit breaker pipe and line voltage compensation module；Wherein, after the voltage of input is depressured by FET, export to band-gap reference module to produce corresponding reference voltage；Excess temperature adjustment module detects the temperature of LED drive chip, and accordingly excess temperature Regulate signal is to band-gap reference module for output, to adjust the temperature of LED drive chip；The voltage that line voltage compensation module inputs in detection power input, and the voltage linear inputted according to power input adjusts the output to the reference voltage level of operational amplifier, to compensate the general power of LED drive chip.The present invention solves LED drive chip system power not quietly, fluctuates the problem of serious.
Description
Technical field
The present invention relates to lighting technical field, more particularly to a kind of LED drive chip, LED drive circuit and LED illumination dress
Put.
Background technology
At present, LED has many advantages, such as energy-saving and environmental protection, long lifespan, small volume, in answering for such as illumination etc.
With conventional light source is progressively substituted, turn into the solid light source of a new generation, linear constant current LED drive chip also produces and should therewith
With.
However, when LED string quantity immobilizes, when the alternating voltage that the power input of LED drive system inputs
Rise, system power do not have it is increased in the case of, the resistance of power tube will become big, cause power tube power consumption increase and send out
It is hot serious, when temperature is increased to triggering excess temperature regulation in chip, then the total work of system can be made to take the lead in declining after rising, from
And emergent power is not quietly, fluctuates the problem of serious.
The content of the invention
The main object of the present invention is to propose a kind of LED drive chip, LED drive circuit and LED light device, it is intended to is solved
Certainly when LED drive chip system input voltage increases, cause the power consumption of power tube to increase and generate heat seriously, so as to emergent power
Not quietly, the problem of serious is fluctuated.
To achieve the above object, a kind of LED drive chip of the present invention, the LED drive chip include power input, line
Voltage compensation input, current settings end, and be integrated in the LED drive chip excess temperature adjustment module, band-gap reference
Module, operational amplifier, FET, high-voltage circuit breaker pipe and line voltage compensation module, the power input respectively with
The drain electrode of the FET and the drain electrode of high-voltage circuit breaker pipe connection；Imitated respectively with the field at the current settings end
Should the grid of pipe, the inverting input of the operational amplifier and the high-voltage circuit breaker pipe source electrode connection；The field effect
Should the source electrode of pipe and the output end of the excess temperature adjustment module be connected with the band-gap reference module；The operational amplifier
Output end is connected with the grid of the high-voltage circuit breaker pipe；The line voltage compensation input and the line voltage compensation module
Input connection；The output end of the output end of the line voltage compensation module and the band-gap reference module respectively with the fortune
Calculate the positive output end connection of amplifier；Wherein,
The FET, after the voltage of input is depressured, export to the band-gap reference module to produce
Corresponding reference voltage；
The excess temperature adjustment module, for detecting the temperature of the LED drive chip, and export accordingly excess temperature regulation letter
Number to the band-gap reference module, to adjust the temperature of the LED drive chip；
The line voltage compensation module, for detecting the voltage of the power input input, and according to the power supply
The voltage linear of input input adjusts the output to the reference voltage level of the operational amplifier, to compensate LED drive chip
General power.
Preferably, the LED drive chip also includes the low-tension supply module to operational amplifier power supply, described low
The input of piezoelectricity source module is connected with the source electrode of the FET, output end and the computing of the low-tension supply module
The power end connection of amplifier.
Preferably, the LED drive chip also includes earth terminal, and the line voltage compensation module includes the first metal-oxide-semiconductor, the
Two metal-oxide-semiconductors, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor are the input of the line voltage compensation module,
And with the gate interconnection of grid, the line voltage compensation input and the 3rd metal-oxide-semiconductor, the source electrode pole of first metal-oxide-semiconductor
The gate interconnection of grid, drain electrode and the 4th metal-oxide-semiconductor with second metal-oxide-semiconductor；The drain electrode of 3rd metal-oxide-semiconductor is described
The output end of line voltage compensation module, the source electrode of the 3rd metal-oxide-semiconductor are connected with the drain electrode of the 4th metal-oxide-semiconductor；Described second
The source electrode of metal-oxide-semiconductor is connected with the source electrode of the 4th metal-oxide-semiconductor with the earth terminal.
Preferably, the high-voltage circuit breaker pipe is metal-oxide-semiconductor.
The present invention also proposes a kind of LED drive circuit, including power-switching circuit, the first LED string, the second LED string,
First chip module, the first electric current preset resistance, the second electric current preset resistance, line voltage compensation preset resistance, line voltage compensation
Electric capacity, one-way conduction element and multiple LED drive chips as described above, multiple LED drive chips are maintained to be arranged in parallel；
The input of the power-switching circuit is used for incoming transport voltage, and the output end of the power-switching circuit is respectively with described
The input connection of multiple power inputs of one chip module, the first LED string；The output of the first LED string
End is connected with the input of the one-way conduction element；Multiple current settings ends of first chip module respectively with the list
The first end interconnection of output end and the first electric current preset resistance to breakover element；The multiple of first chip module connect
Ground terminal interconnects with the second end of the first electric current preset resistance and the input of the second LED string respectively；Described second
The of the power inputs of the output end of LED string and multiple LED drive chips and the line voltage compensation preset resistance
One end interconnects；Second end of the line voltage compensation preset resistance and the line voltage compensation of multiple LED drive chips input
End and the line voltage compensation maintain the first end interconnection of electric capacity；The line voltage compensation maintains the second end of electric capacity and multiple institutes
State the earth terminal of LED drive chip, the first end of the second electric current preset resistance is grounded；Multiple LED drive chips
Current settings end be connected with the second end of the second electric current preset resistance.
Preferably, first chip module includes multiple first chips, and first chip includes the first power input
End, the first line voltage compensation input, the first current settings end, and the first excess temperature regulation being integrated in first chip
Module, the first band gap base modules, the first operational amplifier, the first FET and the first high-voltage circuit breaker pipe, described
One power input is connected with the drain electrode of first FET and the drain electrode of the high-voltage circuit breaker pipe respectively；Described
One current settings the end grid with first FET, the inverting input of first operational amplifier and described respectively
The source electrode connection of first high-voltage circuit breaker pipe；The source electrode of first FET and the first excess temperature adjustment module it is defeated
Go out end to be connected with the first band gap base modules；The output end of first operational amplifier and first high-voltage power
The grid connection of switching tube；The output end of the first band gap base modules is defeated with the positive of first operational amplifier respectively
Go out end connection；Wherein,
First FET, after the voltage of input is depressured, export to the first band-gap reference mould
Block is to produce corresponding reference voltage；
The first excess temperature adjustment module, reached for detecting the temperature of the LED drive chip, and in the temperature detected
During to preset temperature threshold value, output excess temperature Regulate signal is to the first band gap base modules, to adjust first chip
Temperature.
Preferably, the LED drive circuit also includes being used to control the first of the first LED string steady operation to maintain
Circuit and the second holding circuit for controlling the second LED string steady operation, first holding circuit and described the
One LED connection in series-parallel is set；Second holding circuit is set with the second LED connection in series-parallel.
Preferably, first holding circuit includes first fictitious load resistance, the first lamp string pressure difference maintains electric capacity, and described the
One dummy resistance and the first lamp string pressure difference maintain electric capacity to be arranged in parallel respectively in the both ends of the first LED string.
Preferably, second holding circuit includes the second dummy resistance, the second lamp string pressure difference maintains electric capacity, and described the
Two dummy resistances and the second lamp string pressure difference maintain electric capacity to be arranged in parallel respectively in the both ends of the second LED string.
The present invention also proposes a kind of LED light device, including LED drive circuit as described above；Including Power convert electricity
Road, the first LED string, the second LED string, the first chip module, the first electric current preset resistance, the second electric current preset resistance, line
Voltage compensation preset resistance, line voltage compensation maintain electric capacity, one-way conduction element and multiple LED drive chips as described above,
Multiple LED drive chips are arranged in parallel；The input of the power-switching circuit is used for incoming transport voltage, the power supply
The input of the output end of change-over circuit multiple power inputs with first chip module, the first LED string respectively
End connection；The output end of the first LED string is connected with the input of the one-way conduction element；First chip module
Multiple current settings ends respectively with the output end of the one-way conduction element and the first end of the first electric current preset resistance
Interconnection；Multiple earth terminals of first chip module respectively with the second end of the first electric current preset resistance and described second
The input interconnection of LED string；The power input of the output end of the second LED string and multiple LED drive chips
And the first end interconnection of the line voltage compensation preset resistance；Second end of the line voltage compensation preset resistance with it is multiple described
The line voltage compensation input of LED drive chip and the line voltage compensation maintain the first end interconnection of electric capacity；The line voltage
Compensation maintains the second end of electric capacity and the earth terminal of multiple LED drive chips, the first of the second electric current preset resistance
End is grounded；The current settings end of multiple LED drive chips is connected with the second end of the second electric current preset resistance.
LED drive chip of the present invention detects line voltage compensation by line voltage compensation module through line voltage compensation input
The offset voltage size of preset resistance, and according to the offset voltage size, after producing the electric current for needing to compensate, and extract operation is put
The normal phase input end namely reference voltage input terminal VREF electric currents of big device, to control reference voltage VREF linearly to reduce, so as to
The electric current for passing through power switch pipe also reduces therewith, keeps the power consumption of power switch pipe constant.The present invention is solved in LED
When driving chip system input voltage increases, cause the power consumption of power tube to increase and generate heat it is serious, so as to emergent power not quietly,
Fluctuate the problem of serious.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the structural representation of the embodiment of LED drive chip one of the present invention；
Fig. 2 is the electrical block diagram of Fig. 1 LED drive chip neutral voltage compensating module；
Fig. 3 is the electrical block diagram that LED drive circuit of the present invention is applied to an embodiment LED light device.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 100 | Power-switching circuit | C22 | Second lamp string pressure difference maintains electric capacity |
| 200 | First LED string | R1 | First electric current preset resistance |
| 300 | Second LED string | R2 | Second electric current preset resistance R2 |
| 400 | First chip module | R3 | Line voltage compensation preset resistance |
| 500 | LED drive chip | R4 | Protective resistance |
| 10 | Excess temperature adjustment module | R21 | First fictitious load resistance |
| 20 | Band-gap reference module | R22 | Second dummy resistance |
| 30 | Operational amplifier | Q1 | FET |
| 40 | Line voltage compensation module | Q2 | High-voltage circuit breaker pipe |
| 50 | Low-tension supply module | Q41 | First metal-oxide-semiconductor |
| 210 | First holding circuit | Q42 | Second metal-oxide-semiconductor |
| 220 | Second holding circuit | Q43 | 3rd metal-oxide-semiconductor |
| C11 | Filter capacitor | Q44 | 4th metal-oxide-semiconductor |
| C1 | Line voltage compensation maintains electric capacity | 110 | Rectifier bridge |
| C21 | First lamp string pressure difference maintains electric capacity |
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
If it is to be appreciated that related in the embodiment of the present invention directionality instruction (such as up, down, left, right, before and after ...),
Then directionality instruction be only used for explaining relative position relation under a certain particular pose (as shown in drawings) between each part,
Motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes therewith.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, " first ", " second " etc. are somebody's turn to do
Description be only used for describing purpose, and it is not intended that instruction or implying its relative importance or implicit indicating indicated skill
The quantity of art feature.Thus, " first " is defined, the feature of " second " can be expressed or implicitly includes at least one spy
Sign.In addition, the technical scheme between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
Based on enough realizations, the knot of this technical scheme is will be understood that when the combination appearance of technical scheme is conflicting or can not realize
Conjunction is not present, also not within the protection domain of application claims.
The present invention proposes a kind of LED drive chip.
Referring to figs. 1 to Fig. 3, in an embodiment of the present invention, the LED drive chip 500 includes power input VIN, line
Voltage compensation input LVC, current settings end ISET, and the excess temperature adjustment module being integrated in the LED drive chip 500
10th, band-gap reference module 20, operational amplifier 30, FET Q1, high-voltage circuit breaker pipe Q2 and line voltage compensation module 40.
Specifically, the power input VIN drain electrode with the FET Q1 and the high-voltage circuit breaker respectively
Pipe Q2 drain electrode connection；The current settings end ISET grid with the FET Q1, the operational amplifier 30 respectively
Inverting input and the high-voltage circuit breaker pipe Q2 source electrode connection；The source electrode of the FET Q1 and the excess temperature are adjusted
The output end of section module 10 is connected with the band-gap reference module 20；The output end of the operational amplifier 30 and the high pressure
Power switch pipe Q2 grid connection；The line voltage compensation input LVC and the input of the line voltage compensation module 40
Connection；The output end of the output end of the line voltage compensation module 40 and the band-gap reference module 20 is put with the computing respectively
The positive output end connection of big device 30；Wherein,
The FET Q1, after the voltage of input is depressured, export to the band-gap reference module 20 with
Produce corresponding reference voltage；
The excess temperature adjustment module 10, for detecting the temperature of the LED drive chip 500, and in the temperature detected
When reaching preset temperature threshold value, output excess temperature Regulate signal is to the band-gap reference module 20, to adjust the LED drive chip
500 temperature；
The line voltage compensation module 40, for reaching default in the voltage for detecting the power input VIN inputs
During voltage compensation threshold value, linear regulation is exported to the reference voltage level of the operational amplifier 30, to compensate LED drive chip
500 general power.
In the present embodiment, power input VIN is used to access dc source DC, and FET Q1 preferably uses high-voltage junction
FET Q1, fetron Q1 obtain voltage from power input VIN, utilize high pressure FET Q1 pinch off
The voltage of power input VIN inputs carries out output after decompression is VDD and exported to bandgap voltage reference module.Band-gap reference module
20 voltage signals that can be exported according to the FET Q1 produce one and extremely transported with temperature and the incoherent reference voltage of voltage
Calculate the normal phase input end of amplifier 30.
Excess temperature adjustment module 10 can detect the temperature of LED drive chip 500, and reach first in the temperature detected and preset
During temperature threshold, output excess temperature Regulate signal is to band-gap reference module 20, to control band-gap reference module 20 linearly to reduce benchmark
Magnitude of voltage, so as to reduce the power consumption of chip, reduce temperature.If LED drive chip 500 exceedes certain second temperature threshold value, output
Reference voltage to operational amplifier 30 will appear from avalanche type decline, and power MOS pipe Q2 is in cut-off in LED drive chip 500
State, chip is burnt so as to avoid LED drive chip 500 too high, now LED string electric current is zero, while can also be avoided
Damage LED string.
High-voltage circuit breaker pipe Q2 can be that high pressure power switch pipe Q2, the present embodiment such as metal-oxide-semiconductor, IGBT preferably adopt MOS
Pipe realizes, controls of the high-voltage circuit breaker pipe Q2 based on operational amplifier 30 and conduction and cut-off, and passes through the default end of electric current and connect
Periphery the second electric current preset resistance R2 connect flows through the size of current of switching tube source-drain electrode to control, namely setting flows through LED
The size of current of string.It is understood that when using IGBT or other power switch pipes to realize, can set corresponding
Drive circuit drives the IGBT to work.
It is understood that in the practical application of LED drive chip 500, can be mended in power input VIN and line voltage
Input LVC one peripheral line voltage compensation preset resistance R3 of series connection are repaid, and on-Line Voltage compensation input LVC and earth terminal are set
Put a line voltage compensation and maintain electric capacity C1, during with on-Line Voltage linear change, control accesses to line voltage compensation input LVC's
Electric current is slowly varying.When the voltage increase of power input VIN inputs, line voltage compensation module 40 can be defeated through line voltage compensation
Enter to hold LVC detection line voltage compensation preset resistances R3 offset voltage size, and need to mend according to the offset voltage size, generation
After the electric current repaid, now line voltage compensation module 40 is opened equivalent to a switch, and the positive of extract operation amplifier 30 is defeated
Enter end namely reference voltage input terminal VREF electric currents, so that reference voltage input terminal VREF electric current linearly reduces, this
Sample, the electric current for flowing through high-voltage circuit breaker pipe Q2 also reduce therewith.High-voltage circuit breaker pipe Q2 electric current decreasing value can be according to public affairs
Formula P=UI is calculated and learnt, namely in the case where power is certain, high-voltage circuit breaker pipe Q2 electric current decreasing value and power input
End VIN voltage increment value is inversely proportional, so as to realize the purpose of stable general power.
LED drive chip 500 of the present invention is by line voltage compensation module 40 through line voltage compensation input LVC come detection line
Voltage compensation preset resistance R3 offset voltage size, and according to the offset voltage size, after producing the electric current for needing to compensate, and
The normal phase input end namely reference voltage input terminal VREF electric currents of extract operation amplifier 30, to control reference voltage input terminal
VREF electric current linearly reduces, so that the electric current for flowing through high-voltage circuit breaker pipe Q2 also reduces therewith, keeps high-voltage power
Switching tube Q2 power consumption is constant.The present invention, which solves, when system input voltage increases, causes the power consumption of power tube to increase and send out
It is hot serious, fluctuate the problem of serious so as to emergent power not quietly.
In above-described embodiment, the LED drive chip 500 also includes the low-tension supply to the operational amplifier 30 power supply
Module 50, the input of the low-tension supply module 50 are connected with the source electrode of the FET Q1, the low-tension supply module
50 output end is connected with the power end of the operational amplifier 30.
In the present embodiment, low-tension supply module 50 will give birth to from the voltage VDD after fetron Q1 decompressions processing
Into a constant voltage LVDD, to provide supply voltage for operational amplifier 30, driving operational amplifier 30 works.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, the LED drive chip 500 also includes earth terminal, described
Line voltage compensation module 40 includes the first metal-oxide-semiconductor Q41, the second metal-oxide-semiconductor Q42, the 3rd metal-oxide-semiconductor Q43 and the 4th metal-oxide-semiconductor Q44, described
First metal-oxide-semiconductor Q41 drain electrode is the input of the line voltage compensation module 40, and is inputted with grid, the line voltage compensation
LVC and the 3rd metal-oxide-semiconductor Q43 gate interconnection is held, the source electrode of the first metal-oxide-semiconductor Q41 is with the second metal-oxide-semiconductor Q42's
Grid and drain electrode, and the gate interconnection of the 4th metal-oxide-semiconductor Q44；The drain electrode of the 3rd metal-oxide-semiconductor Q43 is mended for the line voltage
The output end of module 40 is repaid, the source electrode pole of the 3rd metal-oxide-semiconductor Q43 is connected with the drain electrode of the 4th metal-oxide-semiconductor Q44；Described
Two metal-oxide-semiconductor Q42 drain electrode is connected with the drain electrode of the 4th metal-oxide-semiconductor Q44 with the earth terminal GND.
In the present embodiment, the first metal-oxide-semiconductor Q41 receives offset voltage, namely line voltage by line voltage compensation input LVC
The pressure drop on preset resistance R3 is compensated, line voltage compensation preset resistance R3 is additionally operable to limitation output to line voltage compensation module 40
Electric current, burn metal-oxide-semiconductor to avoid electric current excessive.Wherein, the first metal-oxide-semiconductor Q41 and the second metal-oxide-semiconductor Q42 use diode-connected,
The electric current for needing to compensate is produced with peripheral line voltage compensation preset resistance R3, flows through the 3rd metal-oxide-semiconductor Q43's and the 4th metal-oxide-semiconductor Q44
Current value and the current value for flowing through the first metal-oxide-semiconductor Q41 and the second metal-oxide-semiconductor Q42, its proportionate relationship are 1:N (wherein N>0) it is, peripheral
The current path mirror image that electric current on line voltage compensation preset resistance R3 is made up of the first metal-oxide-semiconductor Q41 and the second metal-oxide-semiconductor Q42,
Namely the voltage increase as power input VIN, the current path that current mirror forms to Q43 and Q44, and mirroring ratios are N；
1, when the 3rd metal-oxide-semiconductor Q43 turns on the 4th metal-oxide-semiconductor Q44, the band-gap reference that is extracted on the normal phase input end of operational amplifier 30
The current value that module 20 exports is the 1/N for flowing through R3 current values so that high-voltage circuit breaker pipe Q2 is kept during work
Power is basically unchanged.It is arranged such, so that the normal phase input end voltage linear of operational amplifier 30 reduces, flows through power tube
Electric current also reduce therewith, power tube heating is small, you can stable general power is held essentially constant.
The present invention also proposes a kind of LED drive circuit.
Referring to figs. 1 to Fig. 3, in an embodiment of the present invention, the LED drive circuit includes power-switching circuit 100, first
LED string 200, the second LED string 300, the first chip module 400, the first electric current preset resistance R1, the second electric current preset resistance
R2, line voltage compensation preset resistance R3, line voltage compensation maintain electric capacity C1, one-way conduction element D1 and multiple as described above
LED drive chip 500.
Multiple LED drive chips 500 are arranged in parallel；The input of the power-switching circuit 100, which is used to access, to be handed over
Flow voltage Vac, the output end of the power-switching circuit 100 multiple power inputs with first chip module 400 respectively
Hold the input connection of VIN, the first LED string 200；The output end of the first LED string 200 and the one-way conduction
Element D1 input connection；Multiple current settings end ISET of first chip module 400 respectively with the one-way conduction
Element D1 output end and the interconnection of the first end of the first electric current preset resistance R1；First chip module 400 it is multiple
Earth terminal interconnects with the second end of the first electric current preset resistance R1 and the input of the second LED string 300 respectively；Institute
The output end of the second LED string 300 is stated to mend with the power input VIN of multiple LED drive chips 500 and the line voltage
Repay preset resistance R3 first end interconnection；The second end of the line voltage compensation preset resistance R3 and multiple LED drivings cores
The line voltage compensation input LVC of piece 500 and the line voltage compensation maintain electric capacity C1 first end interconnection；The line voltage is mended
Repay the earth terminal that maintains electric capacity C1 the second end with multiple LED drive chips 500, the second electric current preset resistance R2
First end is grounded；The current settings end ISET and second electric current of multiple LED drive chips 500 (U21~U2N) are pre-
If resistance R2 the second end connection.
In the present embodiment, the detailed construction of the LED drive chip 500 can refer to above-described embodiment, and here is omitted.It is single
It is isolating diode to breakover element D1, the electric current that one-way conduction element D1 is used to avoid the first chip module 400 from exporting pours in down a chimney
To the first LED string 200, and influence the normal work of the first LED string 200.In order to avoid flowing through the electric current of isolating diode
Excessive and cause isolating diode breakdown, the present embodiment has also been arranged in parallel protective resistance R4 at isolating diode both ends.
Power-switching circuit 100 includes rectifier bridge 110 and filter capacitor C11, and rectifier bridge 110 enters the AC power of input
Dc source is exported after row rectification to dc bus DCBUS, and after being filtered by filter capacitor C11, be lamp string with first
Chip module 400 and other circuit modules provide operating voltage.
In above-described embodiment, first chip module includes multiple first chips (not shown), first chip
Including the first power input, the first line voltage compensation input, the first current settings end, and it is integrated in first chip
In the first excess temperature adjustment module, the first band gap base modules, the first operational amplifier, the first FET and the first high pressure work(
Rate switching tube, first power input respectively with the drain electrode of first FET and the high-voltage circuit breaker pipe
Drain electrode connection；The first current settings end grid with first FET, first operational amplifier respectively
The source electrode of inverting input and the first high-voltage circuit breaker pipe connects；The source electrode of first FET and described first
The output end of excess temperature adjustment module is connected with the first band gap base modules；The output end of first operational amplifier with
The grid connection of the first high-voltage circuit breaker pipe；The output end of the first band gap base modules is transported with described first respectively
Calculate the positive output end connection of amplifier；Wherein,
First FET, after the voltage of input is depressured, export to the first band-gap reference mould
Block is to produce corresponding reference voltage；
The first excess temperature adjustment module, reached for detecting the temperature of the LED drive chip, and in the temperature detected
During to preset temperature threshold value, output excess temperature Regulate signal is to the first band gap base modules, to adjust first chip
Temperature.
It is understood that line voltage compensation module 40 can also be integrated in the first chip, line voltage compensation mould is integrated with
First chip of block 40, its function is identical with LED drive chip 500 with structure, specifically can refer to above-described embodiment, herein no longer
Repeat.Reference picture 3, multiple first chips (U11~U1N) are arranged in parallel, and are opened according to the dc bus DCBUS voltages inputted
Open/close, to drive the work of the first lamp string.Certainly, the first chip can also be realized using LED drive chip 500, in reality
Using when LED drive chip 500 line voltage compensation input LVC ground connection or hanging.Or in chip package, do not draw
Line voltage compensates input.
Specifically, when the voltage of dc bus DCBUS inputs is less than first voltage threshold value, the voltage can not drive first
The LED string 300 of LED string 200 and second works, and now the first LED string 200 and the second LED string 300 are in ending shape
State is without being lit.
When the voltage of dc bus DCBUS inputs is more than first voltage threshold value and when being less than second voltage threshold value, now the
The voltage of power input VIN accesses access dc bus DCBUS inputs in one chip module 400, and make its first high pressure work(
Rate switching tube Q2 is turned on and started working, and earth terminal of the voltage through the first chip module 400 for inputting dc bus DCBUS
After the saturation voltage drop of the second LED string 300, the second LED string 300 is lighted.Then flow through total electricity of the first chip module 400
Stream is set by the first electric current preset resistance R1, therefore is passed through and adjusted that the first electric current preset resistance R1 resistance is i.e. adjustable to flow through the
The total current value of one chip module 400, namely regulation flow through the electric current of the second LED string 300.Then export to LED and drive core
Piece 500, and make the normal work of LED drive chip 500, then flowing through the electric current of LED drive chip 500 passively will follow the first core
The current value of piece module 400, the i.e. electric current of the second LED string 300 can be set according to the first electric current preset resistance R1.
When the voltage of dc bus DCBUS inputs is more than second voltage threshold value, first in the first chip module 400
Power tube is ended, and now the first LED string 200 and the second LED string 300 are series relationship, dc bus DCBUS inputs
Voltage presses after the saturation voltage drop of the first LED string 200, isolating diode and the second LED string 300 drives core to LED
Piece, the total current for then flowing through each LED drive chip 500 are set by the second electric current preset resistance R2, therefore pass through regulation second
Electric current preset resistance R2 resistance is the adjustable total current value for flowing through the first chip module 400, namely adjusts and flow through the first LED
The electric current of the LED string 300 of lamp string 200 and second.Now, line voltage compensation preset resistance R3 and line voltage compensation maintain electric capacity C1
Line voltage compensation is realized to LED drive chip 500.
It should be noted that because common single hop linear constant current dimming mode is present, light modulation stroke is short, and dead time is grown
The shortcomings that, and cause to flash when dimming LED string depth.When depth dims, now dc bus DCBUS is inputted
Voltage be more than and first voltage threshold value and be less than second voltage threshold value, LED can be dimmed according to the operating mode, and
The saturation voltage drop of LED is lower, and stroboscopic index is also lower when depth dims, you can solves asking for stroboscopic occur during depth light modulation
Topic, and solve the problems, such as that single hop linear constant current light modulation stroke, short dead time are long.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, the LED drive circuit also includes being used to control described first
First holding circuit 210 of the steady operation of LED string 200 and second for controlling the steady operation of the second LED string 300
Holding circuit 220, first holding circuit 210 are arranged in parallel with the first LED string 200；Second holding circuit
220 are arranged in parallel with the second LED string 300.
Wherein, first holding circuit 210 includes first fictitious load resistance R21, the first lamp string pressure difference maintains electric capacity
C21, the first fictitious load resistance R21 and the first lamp string pressure difference maintain electric capacity C21 to be arranged in parallel respectively in described first
The both ends of LED string 200.
Wherein, second holding circuit 220 includes the second lamp string pressure difference maintenance electric capacity C22, the second lamp string pressure difference maintains
Electric capacity, the second lamp string pressure difference maintain electric capacity C22 and the second lamp string pressure difference to maintain electric capacity to be arranged in parallel respectively in described
The both ends of second LED string 300.
In the present embodiment, first fictitious load resistance R21, the first lamp string pressure difference maintain electric capacity C21, the second lamp string pressure difference to maintain
Electric capacity C22 and the second dummy resistance R22 is used to control and maintains the first LED string 200 and the stabilization of the second LED string 300
Reliable work.
The present invention also proposes a kind of LED light device, including LED drive circuit as described above.It is understood that by
In having used above-mentioned LED drive circuit in LED light device of the present invention, therefore, the embodiment bag of LED light device of the present invention
Whole technical schemes of above-mentioned LED drive circuit whole embodiments are included, and the technique effect reached is also identical, herein not
Repeat again.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every at this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in the scope of patent protection of the present invention.
Claims (10)
1. a kind of LED drive chip, it is characterised in that the LED drive chip includes power input, line voltage compensation inputs
End, current settings end, and be integrated in the LED drive chip excess temperature adjustment module, band-gap reference module, operation amplifier
Device, FET, high-voltage circuit breaker pipe and line voltage compensation module, the power input respectively with the FET
Drain electrode and the drain electrode of high-voltage circuit breaker pipe connection；The current settings end grid with the FET, institute respectively
State the source electrode connection of the inverting input and the high-voltage circuit breaker pipe of operational amplifier；The source electrode of the FET and institute
The output end for stating excess temperature adjustment module is connected with the band-gap reference module；The output end of the operational amplifier and the height
Press the grid connection of power switch pipe；The line voltage compensation input is connected with the input of the line voltage compensation module；
The output end of the output end of the line voltage compensation module and the band-gap reference module respectively with the operational amplifier just
Phase output terminal connects；Wherein,
The FET, after the voltage of input is depressured, export to the band-gap reference module corresponding to produce
Reference voltage；
The excess temperature adjustment module, reach default temperature for detecting the temperature of the LED drive chip, and in the temperature detected
When spending threshold value, output excess temperature Regulate signal is to the band-gap reference module, to adjust the temperature of the LED drive chip；
The line voltage compensation module, for reaching predeterminated voltage compensation threshold in the voltage for detecting the power input input
During value, linear regulation is exported to the reference voltage level of the operational amplifier, to compensate the general power of LED drive chip.
2. LED drive chip as claimed in claim 1, it is characterised in that the LED drive chip also includes to the computing
The low-tension supply module of amplifier power supply, the input of the low-tension supply module are connected with the source electrode of the FET, institute
The output end for stating low-tension supply module is connected with the power end of the operational amplifier.
3. LED drive chip as claimed in claim 1, it is characterised in that the LED drive chip also includes earth terminal, institute
Stating line voltage compensation module includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, first metal-oxide-semiconductor
Drain as the input of the line voltage compensation module, and grid, the line voltage compensation input with first metal-oxide-semiconductor
And the gate interconnection of the 3rd metal-oxide-semiconductor, the grid of the source electrode of first metal-oxide-semiconductor and second metal-oxide-semiconductor, drain electrode and described
The gate interconnection of 4th metal-oxide-semiconductor；3rd metal-oxide-semiconductor drain electrode for the line voltage compensation module output end, the described 3rd
The source electrode of metal-oxide-semiconductor is connected with the drain electrode of the 4th metal-oxide-semiconductor；The source electrode of the source electrode of second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor
It is connected with the earth terminal.
4. the LED drive chip as described in claims 1 to 3 any one, it is characterised in that the high-voltage circuit breaker pipe is
Metal-oxide-semiconductor.
5. a kind of LED drive circuit, it is characterised in that including power-switching circuit, the first LED string, the second LED string,
One chip module, the first electric current preset resistance, the second electric current preset resistance, line voltage compensation preset resistance, line voltage compensation dimension
Hold electric capacity, one-way conduction element and multiple LED drive chips as described in Claims 1-4 any one, multiple LED
Driving chip is arranged in parallel；The input of the power-switching circuit is used for incoming transport voltage, the power-switching circuit
Multiple power inputs with first chip module, the input of the first LED string are connected output end respectively；It is described
The output end of first LED string is connected with the input of the one-way conduction element；Multiple electric currents of first chip module
End is set to interconnect with the output end of the one-way conduction element and the first end of the first electric current preset resistance respectively；Described
Multiple earth terminals of one chip module are defeated with the second end of the first electric current preset resistance and the second LED string respectively
Enter end interconnection；Power input and the line voltage of the output end of the second LED string with multiple LED drive chips
Compensate the first end interconnection of preset resistance；Second end of the line voltage compensation preset resistance and multiple LED drive chips
Line voltage compensation input and the line voltage compensation maintain electric capacity first end interconnection；The line voltage compensation maintains electric capacity
The second end be grounded with the earth terminal of multiple LED drive chips, the first end of the second electric current preset resistance；It is multiple
The current settings end of the LED drive chip is connected with the second end of the second electric current preset resistance.
6. LED drive circuit as claimed in claim 5, it is characterised in that first chip module includes multiple first cores
Piece, first chip include the first power input, the first line voltage compensation input, the first current settings end, Yi Jiji
Into the first excess temperature adjustment module in first chip, the first band gap base modules, the first operational amplifier, first effect
Should manage with the first high-voltage circuit breaker pipe, first power input respectively with the drain electrode of first FET and described
The drain electrode connection of high-voltage circuit breaker pipe；The first current settings end grid with first FET, described respectively
The source electrode of the inverting input of first operational amplifier and the first high-voltage circuit breaker pipe connects；First FET
Source electrode and the output end of the first excess temperature adjustment module be connected with the first band gap base modules；First computing
The output end of amplifier is connected with the grid of the first high-voltage circuit breaker pipe；The output end of the first band gap base modules
The positive output end with first operational amplifier is connected respectively；Wherein,
First FET, after the voltage of input is depressured, export to the first band gap base modules with
Produce corresponding reference voltage；
The first excess temperature adjustment module, reach pre- for detecting the temperature of the LED drive chip, and in the temperature detected
If during temperature threshold, output excess temperature Regulate signal is to the first band gap base modules, to adjust the temperature of first chip.
7. LED drive circuit as claimed in claim 5, it is characterised in that the LED drive circuit also includes being used to control institute
State the first holding circuit of the first LED string steady operation and for controlling the second of the second LED string steady operation to tie up
Circuit is held, first holding circuit is set with the first LED connection in series-parallel；Second holding circuit and described second
LED connection in series-parallel is set.
8. LED drive circuit as claimed in claim 7, it is characterised in that first holding circuit includes first fictitious load
Resistance, the first lamp string pressure difference maintain electric capacity, and the first fictitious load resistance and the first lamp string pressure difference maintain electric capacity difference simultaneously
Connection is arranged at the both ends of the first LED string.
9. LED drive circuit as claimed in claim 7, it is characterised in that second holding circuit includes the second fictitious load
Resistance, the second lamp string pressure difference maintain electric capacity, and second dummy resistance and the second lamp string pressure difference maintain electric capacity difference simultaneously
Connection is arranged at the both ends of the second LED string.
10. a kind of LED light device, it is characterised in that drive electricity including the LED as described in claim 5 to 9 any one
Road.
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| CN201711101077.8A CN107734777B (en) | 2017-11-09 | 2017-11-09 | LED driving chip, LED driving circuit and LED lighting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109496040A (en) * | 2018-11-20 | 2019-03-19 | 广州市力驰微电子科技有限公司 | Great power LED linear constant current drive control chip |
| CN109756204A (en) * | 2019-03-05 | 2019-05-14 | 广东合微集成电路技术有限公司 | A kind of filter, oscillation generating circuit and electronic device |
| CN111239465A (en) * | 2020-01-16 | 2020-06-05 | 昂宝电子（上海）有限公司 | Line voltage detection circuit, system and method |
| CN112235909A (en) * | 2020-11-03 | 2021-01-15 | 厦门亚成微电子有限责任公司 | Charging and discharging method and circuit of LED driving chip |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120098448A1 (en) * | 2010-10-20 | 2012-04-26 | Innovision Co., Ltd. | Light emitting diode driving device |
| WO2013078669A1 (en) * | 2011-12-02 | 2013-06-06 | Ye Jun | Led drive circuit and led drive chip |
| US20150042229A1 (en) * | 2013-08-09 | 2015-02-12 | Stmicroelectronics (Shenzhen) R&D Co. Ltd. | Driving apparatus for a light emitting device and method for the same |
| CN105554954A (en) * | 2016-01-26 | 2016-05-04 | 佛山市南海区联合广东新光源产业创新中心 | Control chip for LED (Light-Emitting Diode) driving |
| CN105548672A (en) * | 2016-01-27 | 2016-05-04 | 深圳市瑞之辰科技有限公司 | Over-current detection circuit of power switch |
| CN207427526U (en) * | 2017-11-09 | 2018-05-29 | 深圳市瑞之辰科技有限公司 | LED drive chip, LED drive circuit and LED light device |
-
2017
- 2017-11-09 CN CN201711101077.8A patent/CN107734777B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120098448A1 (en) * | 2010-10-20 | 2012-04-26 | Innovision Co., Ltd. | Light emitting diode driving device |
| WO2013078669A1 (en) * | 2011-12-02 | 2013-06-06 | Ye Jun | Led drive circuit and led drive chip |
| US20150042229A1 (en) * | 2013-08-09 | 2015-02-12 | Stmicroelectronics (Shenzhen) R&D Co. Ltd. | Driving apparatus for a light emitting device and method for the same |
| CN105554954A (en) * | 2016-01-26 | 2016-05-04 | 佛山市南海区联合广东新光源产业创新中心 | Control chip for LED (Light-Emitting Diode) driving |
| CN105548672A (en) * | 2016-01-27 | 2016-05-04 | 深圳市瑞之辰科技有限公司 | Over-current detection circuit of power switch |
| CN207427526U (en) * | 2017-11-09 | 2018-05-29 | 深圳市瑞之辰科技有限公司 | LED drive chip, LED drive circuit and LED light device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109496040A (en) * | 2018-11-20 | 2019-03-19 | 广州市力驰微电子科技有限公司 | Great power LED linear constant current drive control chip |
| CN109756204A (en) * | 2019-03-05 | 2019-05-14 | 广东合微集成电路技术有限公司 | A kind of filter, oscillation generating circuit and electronic device |
| CN109756204B (en) * | 2019-03-05 | 2023-11-14 | 广东合微集成电路技术有限公司 | Filter, oscillation generating circuit and electronic device |
| CN111239465A (en) * | 2020-01-16 | 2020-06-05 | 昂宝电子（上海）有限公司 | Line voltage detection circuit, system and method |
| CN111239465B (en) * | 2020-01-16 | 2023-05-23 | 昂宝电子（上海）有限公司 | Line voltage detection circuit, system and method |
| CN112235909A (en) * | 2020-11-03 | 2021-01-15 | 厦门亚成微电子有限责任公司 | Charging and discharging method and circuit of LED driving chip |
| CN112235909B (en) * | 2020-11-03 | 2023-06-02 | 厦门亚成微电子有限责任公司 | Charging and discharging method and circuit of LED driving chip |
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|---|---|
| CN107734777B (en) | 2023-10-27 |
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