CN104135787B - A kind of constant current driver circuit for LED of tunable optical - Google Patents
A kind of constant current driver circuit for LED of tunable optical Download PDFInfo
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Abstract
The present invention provides the constant current driver circuit for LED of a kind of tunable optical, LED drive circuit technical field.This drive circuit includes controllable silicon dimmer, rectifier bridge, filter circuit of pressure-stabilizing and (M+1) individual N-channel enhancement mode metal-oxide-semiconductor, powered LED light source part is divided into and is sequentially connected in series the first group of LED coupled to M group LED, wherein, provide with the first constant current value for controllable silicon dimmer when the first enhancement mode metal-oxide-semiconductor for being less than the running voltage of first group of LED at the output voltage of the forward outfan of rectifier bridge and maintain electric current and make LED light source partial short circuit；X enhancement mode metal-oxide-semiconductor is for driving the 1st group of LED to (X 1) group LED operation and to make Group X LED to the short circuit of M group LED when the output voltage of the forward outfan of rectifier bridge organizes the running voltage of LED more than or equal to the 1st group of LED to (X 1) with the second constant current value, 2≤X≤(M+1), M are the integer more than or equal to 2.This driving circuit structure is simple, low cost, and luminous efficiency is high, it is possible to achieve constant current, tunable optical drive.
Description
Technical field
The invention belongs to LED(Light-Emitting Diode, light emitting diode) drive circuit technical field, relating to can
The constant current driver circuit for LED of light modulation.
Background technology
Along with the development of LED illumination technology is with universal, people constantly pursue high-luminous-efficiency, the LED of low cost shines
Bright device, and, one of drive circuit focus becoming technology of power supply is provided for LED.
Usually, needing LED electric light source part is carried out tunable optical control, the light modulating device generally used can by its principle
To be divided into amplitude light modulation (such as variable resistance light modulation, automatic coupling voltage regulator light modulation) and phase dimming two kinds, wherein, phase place is used to adjust
The controllable silicon dimmer of light principle is widely used in the drive circuit of LED, to realize its brightness adjustment control.
In prior art, for compatible silicon controlled light adjusting controller, drive circuit all uses the switch electricity that all kinds of IC controls
The circuit arrangement in source, normally, its circuit complicated, relatively costly (owing to have employed IC), luminous efficiency is relatively low；And
And, the switching voltage that IC controls is operated in high frequency state, and the Electro Magnetic Compatibility thus resulting in drive circuit is poor.
Summary of the invention
An object of the present invention is, it is achieved to the constant-current driving of LED light source part compatible silicon controlled dimmer
Brightness adjustment control.
A further object of the present invention is, simplifies the circuit structure of LED drive circuit and lowers its cost.
The a further object of the present invention is, improves the luminous efficiency of LED light source part.
For realizing object above or other purposes, the present invention provides the constant current driver circuit for LED of a kind of tunable optical, and it is used
In driving the LED light source part controlling to include the LED of multiple coupled in series, described LED light source part is divided into and is sequentially connected in series
The first group of LED coupled is to M group LED, and M is the integer more than or equal to 2；Described constant current driver circuit for LED includes:
Controllable silicon dimmer；
Rectifier bridge, its forward outfan is coupled to first group of LED input terminal, and its negative sense outfan is coupled to M group LED
Outfan；
It is parallel to the filter circuit of pressure-stabilizing between the forward outfan of described rectifier bridge and negative sense outfan；And
(M+1) individual N-channel enhancement mode metal-oxide-semiconductor, it includes that the first enhancement mode metal-oxide-semiconductor is to (M+1) enhancement mode metal-oxide-semiconductor；
Wherein, (M+1) individual N-channel enhancement mode metal-oxide-semiconductor is that its gate bias is more than its threshold by described pressure filter circuit
The current potential of threshold voltage；
First enhancement mode metal-oxide-semiconductor is less than first group of LED's for the output voltage of the forward outfan at described rectifier bridge
There is provided with the first constant current value for described controllable silicon dimmer during running voltage and maintain electric current and make described LED light source partial short circuit；
X enhancement mode metal-oxide-semiconductor is more than or equal to the 1st group for the output voltage of the forward outfan at described rectifier bridge
The 1st group of LED is driven to (X-1) group LED operation and to make the with the second constant current value during the running voltage of LED to (X-1) group LED
X group LED is short-circuit to M group LED, 2≤X≤(M+1)；
Described first constant current value is less than the second constant current value.
According to the constant current driver circuit for LED of one embodiment of the invention, wherein, the drain electrode of described N-channel enhancement mode metal-oxide-semiconductor with
Described LED light source part couples, and the source electrode of described first enhancement mode metal-oxide-semiconductor to described M enhancement mode metal-oxide-semiconductor is arranged in series respectively
Have some for promoting its source electrode boosting element relative to the current potential of its grid, so that during the conducting of described X enhancement mode metal-oxide-semiconductor,
Described first enhancement mode metal-oxide-semiconductor ends to (X-1) enhancement mode metal-oxide-semiconductor.
Specifically, described boosting element can be the first diode, and the positive pole of described first diode increases with described N-channel
The source of strong type metal-oxide-semiconductor couples, and the negative pole of described first diode couples with the negative sense outfan of described rectifier bridge module.
Specifically, described first enhancement mode metal-oxide-semiconductor is to the most corresponding boosting unit arranged of described M enhancement mode metal-oxide-semiconductor
The quantity of part reduces successively.
According to the constant current driver circuit for LED of further embodiment of this invention, wherein, the source electrode of described first enhancement mode metal-oxide-semiconductor
Coupled in series in the first current regulator diode so that described first enhancement mode metal-oxide-semiconductor conducting time with described first constant current value work.
Further, couple the second current regulator diode so that described X the source series of described X enhancement mode metal-oxide-semiconductor
With described second constant current value work during the conducting of enhancement mode metal-oxide-semiconductor.
According to the constant current driver circuit for LED of a further embodiment of the present invention, wherein, the source electrode of described first enhancement mode metal-oxide-semiconductor
Coupled in series in the first current-limiting resistance so that described first enhancement mode metal-oxide-semiconductor conducting time with described first constant current value work.
Further, couple the second current-limiting resistance so that described X increases the source series of described X enhancement mode metal-oxide-semiconductor
With described second constant current value work during the conducting of strong type metal-oxide-semiconductor.
In the constant current driver circuit for LED of the most described any embodiment, it is preferable that described first enhancement mode metal-oxide-semiconductor is extremely
(M+1) enhancement mode metal-oxide-semiconductor is the N-channel enhancement mode metal-oxide-semiconductor that model is identical, and has identical threshold voltage.
According to the constant current driver circuit for LED of yet another embodiment of the invention, wherein, described filter circuit of pressure-stabilizing includes:
Zener diode；
The first filter capacitor being connected in parallel with described Zener diode；And
The second current-limiting resistance connected with described Zener diode；
Wherein, the anode of described Zener diode couples with the described negative sense outfan stating rectifier bridge, described enhancement mode MOS
The grid of pipe couples with the negative electrode of described Zener diode.
In the constant current driver circuit for LED of the most described any embodiment, it is preferable that described first enhancement mode metal-oxide-semiconductor is extremely
The grid of (M+1) enhancement mode metal-oxide-semiconductor is respectively by the negative electrode coupling of the first resistance to (M+1) resistance Yu described Zener diode
Connect.
In the constant current driver circuit for LED of the most described any embodiment, it is preferable that described first group of LED is to M group
Often group LED in LED is in parallel with one second filter capacitor respectively.
In the constant current driver circuit for LED of the most described any embodiment, it is preferable that each described filter capacitor correspondence sets
Put one second diode, to prevent described second filter capacitor recoil electric discharge.
Specifically, multiple LED of described light source part can be high-voltage LED.
The solution have the advantages that, in this constant current driver circuit for LED, can drive according to the size correspondence of supply voltage
The LED operation of appropriate section, luminous efficiency is greatly improved, and realizes constant-current driving.Meanwhile, circuit structure is simple, low cost,
Achieve the compatibility with controllable silicon dimmer well.Being additionally, since and be operated in low frequency state, Electro Magnetic Compatibility is good.
Accompanying drawing explanation
From combine accompanying drawing described further below, it will make the above and other purpose of the present invention and advantage more complete
Clear, wherein, same or analogous key element is adopted and is indicated by the same numeral.
Fig. 1 is the schematic diagram of the constant current driver circuit for LED of the tunable optical according to one embodiment of the invention.
Fig. 2 is the exemplary waveform diagrams of the power supply of rectifier bridge output.
Fig. 3 is the schematic diagram of the constant current driver circuit for LED of the tunable optical according to further embodiment of this invention.
Detailed description of the invention
Be described below is that the multiple of the present invention may some in embodiments, it is desirable to provide basic to the present invention
Solve, it is no intended to confirm the crucial of the present invention or conclusive key element or limit scope of the claimed.Easy to understand, according to this
The technical scheme of invention, under the connotation not changing the present invention, one of ordinary skill in the art can propose can be mutual
Other implementations replaced.Therefore, detailed description below and accompanying drawing are only the examples to technical scheme
Property explanation, and be not to be construed as the whole of the present invention or be considered as technical solution of the present invention is defined or limited.
In explained below, clear and simple and clear for describe, all parts shown in figure are not carried out the most detailed
Thin description.It is fully able to realize the disclosure shown in the drawings of those of ordinary skill in the art.For this area
For technical staff, the most multipart operation or work are all to be familiar with and obvious.
It will be appreciated that " connected " by parts or during " coupled " to another parts when it is said, it can be directly connected to or directly
It is couple to another parts and maybe can there is intermediate member.On the contrary, parts " are directly coupled " or " being directly connected to " arrives when it is said
During another parts, the most there is not intermediate member.
Fig. 1 show the schematic diagram of the constant current driver circuit for LED of the tunable optical according to one embodiment of the invention.In this enforcement
In example, constant current driver circuit for LED 30 is for providing power supply to control its work to drive for LED light source part 33.In this embodiment
In, LED light source part 33 can be, but not limited to be sequentially connected in series by 5 LED formed, and the model of each LED is the most identical, and
Its running voltage V1 is the most identical；Wherein LED light source part 33 is divided into two groups, i.e. LED group 332 and LED group 333, LED group
332 be also connected in series with LED group 333 together with.Specifically, each LED of LED light source part 33 can be high-voltage LED.
Constant current driver circuit for LED 30 is powered by alternating current power supply (VAC), its live wire termination controllable silicon dimmer 31, controllable silicon
Dimmer 31 can be the controllable silicon dimmer of standard type, such as, the controllable silicon dimmer of 220V, thus it is possible to vary alternating current power supply
Phase place.Alternating current power supply can be such as 180-260V alternating current power supply, and it is by inputting to rectifier bridge 32 after control silicon dimmer 31.Whole
Stream bridge 32 is bridge rectifier, and it consists of 4 D0, and wherein a end is forward outfan, and b end is negative sense outfan.
Fig. 2 show the exemplary waveform diagrams of the power supply of rectifier bridge output.As in figure 2 it is shown, 321 is the alternating current before rectification
The waveform in source, 322 is the power supply wave shape of the forward end a after rectifier bridge 32 rectification processes.Certainly, in this diagram embodiment
In, do not consider the controllable silicon light modulation 31 impact on the waveform of alternating current power supply, it will be understood that their concrete waveform shape is not limit
Property processed.
Constant current driver circuit for LED 30 also includes filter circuit of pressure-stabilizing, and in this embodiment, it includes Zener diode (D9)
375, filter capacitor 376, current-limiting resistance 374, the negative electrode of Zener diode (D9) 375 is connected with b end, and its anode is by series connection
Current-limiting resistance 373 is connected to a end, and filter capacitor 376 is in parallel with Zener diode 375.So Zener diode (D9) 375 is steady
Determine voltage and determine A, B, C tri-voltage of end.
Constant current driver circuit for LED 30 also includes 3 N-channel enhancement mode metal-oxide-semiconductors 341,342,343, in FIG, A Yu A pair
Should connect, B with B is corresponding to be connected, C with C is corresponding to be connected, and therefore, metal-oxide-semiconductor 341,342,343 is respectively by resistance 371,372,373
Being connected with the negative electrode of Zener diode 375, the grid of metal-oxide-semiconductor 341,342,343 is biased a metastable positive potential, and this is just
Current potential is more than the threshold voltage (Vth) of metal-oxide-semiconductor 341,342,343, thus under normal circumstances, metal-oxide-semiconductor 341,342,343 can be led
Logical.Wherein, resistance 371,372,373 is possible to prevent interfering between metal-oxide-semiconductor 341,342 and 343.
In this embodiment, the drain electrode (D) of metal-oxide-semiconductor 341 is connected to a end of rectifier bridge 32, and the source electrode (S) of metal-oxide-semiconductor 341 is also
Being provided with multiple diode D3 to D6 being connected in series, the source electrode of metal-oxide-semiconductor 341 is connected to the anode of diode D3；Diode D6
Negative electrode be coupled to the b end of rectifier bridge 32.Specifically, the negative electrode of diode D6 is additionally provided with current regulator diode 361, thus
When metal-oxide-semiconductor 341 turns on, its electric conduction stream is constant at I by current regulator diode 3611。
Further, the corresponding LED group 332 of metal-oxide-semiconductor 342 is arranged, and the drain electrode of metal-oxide-semiconductor 342 is connected with the negative end of LED group 332；
The corresponding LED group 333 of metal-oxide-semiconductor 343 is arranged, and the drain electrode of metal-oxide-semiconductor 343 is connected with the negative end of LED group 333.The source electrode of metal-oxide-semiconductor 342
It is additionally provided with diode D8 and D7 being connected in series；The negative electrode of diode D7 is coupled to current regulator diode 162, the source of metal-oxide-semiconductor 343
Pole is directly connected in current regulator diode 162.So, when metal-oxide-semiconductor 342 or 343 turns on, its electric conduction stream passes through current regulator diode
162 are constant at I2, and I1Less than I2。
Wherein, D3 to D6 is for changing the source electrode current potential relative to b end of metal-oxide-semiconductor 341, namely promotes its relative metal-oxide-semiconductor 341
The current potential (no matter metal-oxide-semiconductor 341 be on or off) of grid, therefore, D3 to D6 can be understood as the element that boosts, its series connection
Combination forms the first boost module 351.Similarly, D7 with D8 is used for the source electrode changing metal-oxide-semiconductor 342 current potential relative to b end, namely
Promoting the current potential (no matter metal-oxide-semiconductor 342 is on or off) of the grid of its relative metal-oxide-semiconductor 342, therefore, D7 and D8 can manage
Solving is boosting element, and its tandem compound forms the second boost module 352.And at the source electrode of metal-oxide-semiconductor 341, do not use boosting unit
Part promotes the current potential of its source electrode opposing gate.The quantity of the diode that the source electrode of metal-oxide-semiconductor 341,342,343 is connected gradually subtracts
Few, the current potential of the source electrode of metal-oxide-semiconductor 341,342,343 is gradually lowered, and so, Vgs is gradually reduced, namely Vgs341＜ Vgs342＜
Vgs343, the difference between them is relevant with the forward voltage drop of the difference of the quantity of the diode that source electrode concatenates and diode, because of
This, specifically can arrange the quantity of diode according to specific requirement.The change of Vgs can cause metal-oxide-semiconductor 341,342,343 to exist
In the case of same drain bias and grid bias, its conducting situation changes.
Specifically, in this embodiment, shown in Fig. 2, the Vg of metal-oxide-semiconductor 341,342,343 is substantially equal to 0；At a end
Voltage less than the running voltage of LED group 332 time, namely during less than 3V1, LED group 332 does not works and shows as ending, MOS
Pipe 342,343 shows cut-off (i.e. turning off) naturally, but, now, enhancement mode metal-oxide-semiconductor 341 can be with constant current value I1Conducting (A end
Voltage more than its threshold voltage vt h), maintain electric current as such, it is possible to provide for controllable silicon dimmer 11, and make LED light source portion
Divide 32 short circuits.
When the voltage of a end is more than or equal to the running voltage of LED group 332, namely during more than or equal to 3V1, LED group
333 do not work and show as cut-off, and metal-oxide-semiconductor 343 shows cut-off naturally；Due to the existence of the first boost module 351, can make
Vgs341＜ Vth, the second boost module 351 can make Vgs simultaneously342＜ Vth, so, metal-oxide-semiconductor 341 ends, metal-oxide-semiconductor 342 is with perseverance
Flow valuve I2Conducting, thus, constant-current driving LED group 332 works, and makes LED group 333 short circuit.
When the voltage of a end is more than or equal to the running voltage of LED group 332 and LED group 333, namely more than or equal to 5V1
Time, enhancement mode metal-oxide-semiconductor 343 will be with constant current value I2Conducting, meanwhile, the first boost module 351 can make Vgs341＜ Vth, second liter
Die block 351 can make Vgs342＜ Vth, so, metal-oxide-semiconductor 341,342 is turned off；Thus, constant-current driving LED group 332 and 333
Work.
Therefore, constant current driver circuit for LED 30 operationally, can make appropriate section according to the size correspondence of supply voltage
LED operation, luminous efficiency is greatly improved, and realizes constant-current driving.Meanwhile, be no matter metal-oxide-semiconductor 341 or metal-oxide-semiconductor 342 or
When metal-oxide-semiconductor 343 turns on, all can provide for controllable silicon dimmer 11 and maintain electric current, therefore, it can conveniently realize brightness adjustment control.
In the embodiment above, the first boost module 351 and/or the second boost module 352 are not limited to use diode, example
As it can also use Zener diode.It is to be appreciated that the first boost module 351 and existence of the second boost module 352
Cause the potential difference between the source electrode of metal-oxide-semiconductor 341,342,343, the first boost module 351 and/or the second boost module
The size of the boost value of 352, needs to ensure that metal-oxide-semiconductor 341 and 342 is not opened, turned at metal-oxide-semiconductor 342 when metal-oxide-semiconductor 343 turns on
Time metal-oxide-semiconductor 341 do not open, that is, in the case of same drain bias, metal-oxide-semiconductor 343 preferentially turns on than metal-oxide-semiconductor 342, MOS
Pipe 342 preferentially turns on than metal-oxide-semiconductor 341.
Further as it is shown in figure 1, constant current driver circuit for LED 30 also includes in parallel with LED group 332, LED group 333 respectively
Filter capacitor 382,383.Correspondingly, between the forward end and the drain electrode of metal-oxide-semiconductor 341 of LED group 332, diode D1 is set；?
Between forward end and the drain electrode of metal-oxide-semiconductor 342 of LED group 333, diode D2 is set.Diode D1 or D2 can prevent filter respectively
Ripple electric capacity 382 or 383 recoil electric discharge, affects the normal work of LED.
Fig. 3 show the schematic diagram of the constant current driver circuit for LED of the tunable optical according to further embodiment of this invention.Real at this
Executing in example, constant current driver circuit for LED 40 is compared to main difference is that of constant current driver circuit for LED 30 of embodiment illustrated in fig. 1
The difference of its constant current principle, in constant current driver circuit for LED 30, uses current regulator diode to realize constant-current driving, and in LED constant current
In drive circuit 40, it arranges current-limiting resistance 461 and 462.Specifically, current-limiting resistance 461 is arranged on the negative electrode of diode D6 also
By the sources coupled in series of D3 to D6 Yu metal-oxide-semiconductor 341, and metal-oxide-semiconductor 342 or 343 relatively is in parallel；Current-limiting resistance 462
One end couple with b end, other end coupled in parallel is in the source electrode of metal-oxide-semiconductor 341,342,343.Therefore, when metal-oxide-semiconductor 341 turns on,
By current-limiting resistance 461 and 462, electric current is limited to I1, when metal-oxide-semiconductor 342 or metal-oxide-semiconductor 343 turn on, pass through current-limiting resistance
Electric current is limited to I by 4622, therefore, I2＞ I1.And it is possible to according to I2、I1Specific size requirement, current-limiting resistance is set
Resistance R1 of 461 and/or resistance R2 of current-limiting resistance 462.
Miscellaneous part in constant current driver circuit for LED 40 is the most corresponding with the miscellaneous part in constant current driver circuit for LED 30
Identical, and the operation principle of the two is substantially similar.This is no longer going to repeat them.
Although it is to be appreciated that figure 1 above and embodiment illustrated in fig. 3 only illustrating 2 groups of LED groups connected and 3 phases
The metal-oxide-semiconductor answered, but, those skilled in the art according to disclosed above, such as, can arrange the LED group and 5 of 4 groups of series connection analogically
Other situations such as individual corresponding metal-oxide-semiconductor, the quantity of the source electrode of each metal-oxide-semiconductor set boosting element can also respective change set
Put, so that the turn-on sequence of multiple metal-oxide-semiconductor turns on according to disclosed above rule.
The constant current driver circuit for LED of above example need not use IC chip, and circuit structure is simple, and cost drops significantly
Low, achieve the compatibility with controllable silicon dimmer well.And, owing to being operated in low frequency state, (operating frequency is hundreds of for it
Within Hz), Electro Magnetic Compatibility is good.
Example above primarily illustrates the constant current driver circuit for LED of the light modulation of the present invention.Although only to some of them this
Bright embodiment is described, but those of ordinary skill in the art are it is to be appreciated that the present invention can be main without departing from it
Implement with other forms many in purport and scope.Therefore, the example shown and embodiment be considered schematic rather than
Restrictive, in the case of without departing from spirit and scope of the present invention as defined in appended claims, the present invention may
Contain various amendments and replacement.
Claims (13)
1. a constant current driver circuit for LED for tunable optical, it is for driving the LED light controlling to include the LED of multiple coupled in series
Source part, it is characterised in that described LED light source part is divided into and is sequentially connected in series the 1st group of LED coupling to M group LED, M
For the integer more than or equal to 2；Described constant current driver circuit for LED includes:
Controllable silicon dimmer；
Rectifier bridge, its forward outfan is coupled to the 1st group of LED input terminal, and its negative sense outfan is coupled to the output of M group LED
End；
It is parallel to the filter circuit of pressure-stabilizing between the forward outfan of described rectifier bridge and negative sense outfan；And
(M+1) individual N-channel enhancement mode metal-oxide-semiconductor, it includes that the first enhancement mode metal-oxide-semiconductor is to (M+1) enhancement mode metal-oxide-semiconductor；
Wherein, (M+1) individual N-channel enhancement mode metal-oxide-semiconductor is that its gate bias is more than its threshold value electricity by described filter circuit of pressure-stabilizing
The current potential of pressure；
First enhancement mode metal-oxide-semiconductor is used for being less than the work electricity of the 1st group of LED at the output voltage of the forward outfan of described rectifier bridge
There is provided with the first constant current value for described controllable silicon dimmer during pressure and maintain electric current and make described LED light source partial short circuit；
X enhancement mode metal-oxide-semiconductor is more than or equal to the 1st group of LED extremely for the output voltage of the forward outfan at described rectifier bridge
The 1st group of LED is driven to (X-1) group LED operation and to make Group X with the second constant current value when (X-1) organizes the running voltage of LED
LED is short-circuit to M group LED, 2≤X≤(M+1)；
Wherein, described first constant current value is less than the second constant current value；
Wherein, the drain electrode of described N-channel enhancement mode metal-oxide-semiconductor couples with described LED light source part, described first enhancement mode metal-oxide-semiconductor
Source electrode to described M enhancement mode metal-oxide-semiconductor is arranged in series some for promoting its source electrode current potential relative to its grid respectively
Boosting element, so that during the conducting of described X enhancement mode metal-oxide-semiconductor, described first enhancement mode metal-oxide-semiconductor is to (X-1) enhancement mode metal-oxide-semiconductor
Cut-off.
2. constant current driver circuit for LED as claimed in claim 1, it is characterised in that described boosting element is the first diode, institute
The source of the positive pole and described N-channel enhancement mode metal-oxide-semiconductor of stating the first diode couples, and the negative pole of described first diode is with described
The negative sense outfan of rectifier bridge module couples.
3. constant current driver circuit for LED as claimed in claim 1, it is characterised in that described first enhancement mode metal-oxide-semiconductor to the most described the
The quantity of the M enhancement mode metal-oxide-semiconductor corresponding boosting element arranged respectively reduces successively.
4. constant current driver circuit for LED as claimed in claim 1, it is characterised in that the source electrode string of described first enhancement mode metal-oxide-semiconductor
It is coupled to the first current regulator diode so that working with described first constant current value when described first enhancement mode metal-oxide-semiconductor turns on connection.
5. constant current driver circuit for LED as claimed in claim 4, it is characterised in that the source electrode string of described X enhancement mode metal-oxide-semiconductor
Couple the second current regulator diode so that working with described second constant current value when described X enhancement mode metal-oxide-semiconductor turns on connection.
6. constant current driver circuit for LED as claimed in claim 1, it is characterised in that the source electrode string of described first enhancement mode metal-oxide-semiconductor
It is coupled to the first current-limiting resistance so that working with described first constant current value when described first enhancement mode metal-oxide-semiconductor turns on connection.
7. constant current driver circuit for LED as claimed in claim 6, it is characterised in that the source electrode string of described X enhancement mode metal-oxide-semiconductor
Couple the second current-limiting resistance so that working with described second constant current value when described X enhancement mode metal-oxide-semiconductor turns on connection.
8. constant current driver circuit for LED as claimed in claim 1, it is characterised in that described first enhancement mode metal-oxide-semiconductor to (M+
1) enhancement mode metal-oxide-semiconductor is the N-channel enhancement mode metal-oxide-semiconductor that model is identical, and has identical threshold voltage.
9. constant current driver circuit for LED as claimed in claim 1, it is characterised in that described filter circuit of pressure-stabilizing includes:
Zener diode；
The first filter capacitor being connected in parallel with described Zener diode；And
The second current-limiting resistance connected with described Zener diode；
Wherein, the anode of described Zener diode couples with the described negative sense outfan stating rectifier bridge, described enhancement mode metal-oxide-semiconductor
Grid couples with the negative electrode of described Zener diode.
10. constant current driver circuit for LED as claimed in claim 9, it is characterised in that described first enhancement mode metal-oxide-semiconductor to (M+
1) grid of enhancement mode metal-oxide-semiconductor is coupled by the negative electrode of the first resistance to (M+1) resistance with described Zener diode respectively.
11. constant current driver circuit for LED as claimed in claim 1, it is characterised in that in described 1st group of LED to M group LED
Often group LED is in parallel with one second filter capacitor respectively.
12. constant current driver circuit for LED as claimed in claim 11, it is characterised in that each described filter capacitor is correspondingly arranged
One second diode, to prevent described second filter capacitor recoil electric discharge.
13. constant current driver circuit for LED as claimed in claim 1, it is characterised in that multiple LED of described light source part are high
Pressure LED.
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| US10407113B2 (en) * | 2015-11-12 | 2019-09-10 | Semiconductor Components Industries, Llc | LED driver |
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| CN201636622U (en) * | 2010-04-06 | 2010-11-17 | 吴全华 | Digital controllable light alternating-current direct drive integrated LED illuminating lamp |
| CN202602987U (en) * | 2012-04-12 | 2012-12-12 | 上海晶丰明源半导体有限公司 | LED linear driving circuit suitable for silicon controlled light modulator |
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| KR101064906B1 (en) * | 2010-02-03 | 2011-09-16 | (주)로그인디지탈 | LED lighting drive |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201636622U (en) * | 2010-04-06 | 2010-11-17 | 吴全华 | Digital controllable light alternating-current direct drive integrated LED illuminating lamp |
| CN202602987U (en) * | 2012-04-12 | 2012-12-12 | 上海晶丰明源半导体有限公司 | LED linear driving circuit suitable for silicon controlled light modulator |
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