CN105792441B - A kind of linear constant current circuit for controllable silicon light modulation - Google Patents
A kind of linear constant current circuit for controllable silicon light modulation Download PDFInfo
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- CN105792441B CN105792441B CN201610278037.XA CN201610278037A CN105792441B CN 105792441 B CN105792441 B CN 105792441B CN 201610278037 A CN201610278037 A CN 201610278037A CN 105792441 B CN105792441 B CN 105792441B
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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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention belongs to LED control fields, essentially disclose a kind of linear constant current circuit for controllable silicon light modulation, three groups of linear constant current modules and two groups of LED strings are combined, the current regulating resistance of different resistances is set according to the position of every group of linear constant current module in circuit simultaneously, so that two groups of LED strings adaptively can be connected in parallel or be connected in series according to the height of input voltage.The present invention effectively raises the utilization rate of LED string, increases the dimming scope of controllable silicon light modulation, meanwhile, the operating efficiency of circuit is ensure that, reduces circuit loss.
Description
Technical field
The invention belongs to LED control fields, more particularly to a kind of linear constant current circuit for controllable silicon light modulation.
Background technology
LED high-voltage linear constant current technology is so that its scheme is simple, cost is cheap, without high frequency transformer and excellent without EMC problems etc.
Point obtains more and more extensive application, and progressively applies in LED controllable silicon light modulations.
The existing linear constant current circuit applied to LED controllable silicon light modulations of existing market, as shown in figure 1, input AC is electric
One controllable silicon dimmer 101 of potential source electrical series, it is connected to two inputs of rectifier bridge 102, the rectified rectification of bridge 102
After be electrically connected the anode of LED string 105, the negative terminal of LED string 105 is electrically connected main control chip 103, flows through the electricity of LED string 105
Stream is determined by main control chip 103 and current regulating resistance 104, is maintained current control chip 106 and is maintained current regulating resistance 107
The maintenance electric current of controllable silicon light modulation is provided.Circuit needs the conduction voltage drop V of LED string 105LEDThe rectified bridge 102 of matched is whole
The busbar voltage V obtained after stream input voltageLINE, otherwise VLEDMuch smaller than VLINEWhen, circuit efficiency can be extremely low, main control chip 103
On to bear sizable loss, the consequence brought is that chip is hot serious, influences circuit normal work, or even can damage.
If the conduction voltage drop V of LED string 105LEDCan matched input voltage VLINE, efficiency can accomplish more than 90%, but
Now have the problem of light modulation angle is small, dimming scope is low, the utilization rate of LED string 105 is low.As shown in Fig. 2 (a), busbar voltage
VLINEObtained after the rectified rectification of bridge 102 of AC-input voltage, be a half-sinusoid, amplitude with phase angle α change and
Change, for ease of illustrating, α here is analyzed between taking 0 to 180 °, VLINEAmplitude is equal to VLEDWhen phase angle be designated as α0,
By the symmetry of half-sinusoid, the equal phase angle of another amplitude is 180 ° of-α0；Phase angle is in α0With 180 ° of-α0Between when,
VLINEAmplitude is higher than VLED, LED string 105 lights, output current IOUT.Remaining time, LED string 105 are not lit.At one
In the half-sinusoid cycle, the LED quantity that LED string 105 is sealed in is more, VLEDCloser to VLINEAmplitude, the efficiency of whole circuit
Can be higher, but the time that LED string 105 is lit is shorter, and utilization rate is lower.
Because LED string 105 is in α0With 180 ° of-α0Between when can just be lit, so 101 real energy of controllable silicon dimmer
The scope of light modulation is also only in α0With 180 ° of-α0Between, as shown in Fig. 2 (b), once the corner cut β of controllable silicon dimmer 101 is more than
180°-α0, LED string 105 extinguishes, and does not possess dimming function.Within a half-sinusoid cycle, VLEDCloser to VLINEAmplitude,
The dimming scope of controllable silicon dimmer 101 is narrower.
When controllable silicon dimmer 101 dims, output current of the whole LED string 105 within a half-sinusoid cycle is put down
Curve map such as Fig. 2 (c) that average changes with corner cut β is shown.
In summary, the existing linear constant current circuit applied to LED controllable silicon light modulations of existing market, LED string is with string
Entering LED quantity needs matched input voltage：The LED quantity sealed in is lower, and loss is bigger, or even can influence the normal of electric current
Work；The LED quantity sealed in is higher, and LED string utilization rate is lower, and the dimming scope of controllable silicon light modulation is narrower.
The content of the invention
Goal of the invention：For overcome the deficiencies in the prior art, the invention provides one kind to effectively improve efficiency, reduces damage
Consume, the linear constant current circuit of the controllable silicon light modulation of the dimming scope of increase controllable silicon light modulation.
Technical scheme：It is controllable silicon dimmer, whole the invention provides a kind of linear constant current circuit for controllable silicon light modulation
Flow bridge, the first linear constant current chip, the first current regulating resistance, the second linear constant current chip, the second current regulating resistance, the 3rd
Linear constant current chip, the 3rd current regulating resistance, diode, the first LED string, the second LED string and maintenance current regulation mould
Block；The controllable silicon dimmer and AC-input voltage source electrical series；Two inputs of rectifier bridge respectively with thyristor regulating
Light device and AC-input voltage source are electrically connected；The OUT terminal of first linear constant current chip and the positive output end electricity of rectifier bridge connect
Connect；One end of first current regulating resistance and the REXT ends of the first linear constant current chip are electrically connected；First current regulating resistance
The other end GND ends with the first linear constant current chip, the OUT terminal of the second linear constant current chip and the first LED string respectively
Anode is electrically connected；The REXT ends of second linear constant current chip respectively with one end of the second current regulating resistance and the moon of diode
Pole is electrically connected；The GND ends of second linear constant current the chip other end with the second current regulating resistance, the second LED string respectively
Anode be electrically connected；The negative terminal of first LED string is electric with the anode of diode and the OUT terminal of third linear constant current chip respectively
Learn connection；The REXT ends of third linear constant current chip one end with the 3rd current regulating resistance, the negative terminal of the second LED string respectively
It is electrically connected；Output of the GND ends of third linear constant current chip respectively with the other end, rectifier bridge of the 3rd current regulating resistance is born
End is electrically connected；The maintenance current regulating module is used to provide light modulation maintenance electric current to the controllable silicon dimmer.
Further, the maintenance current regulating module includes maintaining current regulating resistance, the maintenance current regulating resistance
Both ends electrically connected respectively with the negative electrode and anode of diode.
Further, the maintenance current regulating module includes maintaining current regulating resistance and maintains current control chip, institute
State and maintain the OUT terminal electricity of current control chip to be electrically connected with the REXT ends of the first linear constant current chip；Maintain current control chip
GND ends be electrically connected respectively with the one end and the output negative terminal of rectifier bridge for maintaining current regulating resistance；Maintain current control core
The REXT ends of piece are respectively with maintaining the other end of current regulating resistance and the GND ends of third linear constant current chip to be electrically connected.This
Sample can provide bigger maintenance electric current, while can the compatible more controllable silicon dimmer of different models and broader input power
Scope.
Further, the resistance of first current regulating resistance is less than the resistance of the 3rd current regulating resistance, the second electric current
The resistance of regulation resistance is more than the resistance of the 3rd current regulating resistance.
Further, the resistance of second current regulating resistance is twice of the 3rd current regulating resistance resistance.It is so logical
Cross that the size of current of two groups of LED strings is equal, effectively raise the utilization rate of two groups of LED strings.
Further, the model of the described first linear constant current chip, the second linear constant current chip and third linear constant current chip
It is CL1570.
Further, the model CL1570 for maintaining current control chip.
Present invention also offers a kind of linear constant current circuit for controllable silicon light modulation, controllable silicon dimmer, rectifier bridge,
One linear constant current chip, the first current regulating resistance, the second linear constant current chip, the second current regulating resistance, third linear are permanent
Flow chip, the 3rd current regulating resistance, diode, the first LED string, the second LED string and maintain current regulating module；Exchange
The electric current that input voltage source provides enters bus after controllable silicon dimmer and rectifier bridge successively, when busbar voltage is higher than 1
The pressure drop of lamp string and during the pressure drop less than the series connection of two lamp strings, the first linear constant current chip is led directly to, the first LED string and second
LED connection in series-parallel is lighted, and bus current is diverted to the branch road where two lamp strings, wherein electric current passes sequentially through two in a branch road
Linear constant current chip, the second current regulating resistance and the second LED string；Electric current passes sequentially through the first LED in another branch road
String and third linear constant current chip, the output current of two articles of branch roads after the 3rd current regulating resistance by returning to rectifier bridge；When
During the pressure drop of higher than two lamp string series connection of busbar voltage, the second linear constant current chip and third linear constant current chip do not work, the
One LED string and the series connection of the second LED string are lighted；Bus current passes sequentially through the first linear constant current chip, the first current regulation
Rectifier bridge is returned to after resistance, the first LED string, the second current regulating resistance, diode and the second LED string；It is described to maintain electricity
Adjustment module is flowed to be used to provide light modulation maintenance electric current to the controllable silicon dimmer.
Operation principle：Three groups of linear constant current modules and two groups of LED strings are combined by the present invention, while according to every group of line
Property constant flow module position in circuit the current regulating resistances of different resistances is set so that two groups of LED strings can basis
The height of input voltage is adaptively connected in parallel or is connected in series.
Beneficial effect：Compared with prior art, the present invention effectively raises the utilization rate of LED string, increase controllable silicon
The dimming scope of light modulation, meanwhile, the operating efficiency of circuit is ensure that, reduces circuit loss.
Brief description of the drawings
Fig. 1 is the circuit diagram for the linear constant current circuit for being used for LED controllable silicon light modulations in the prior art；
Fig. 2 is the LED controllable silicon light modulation linear constant current work wave schematic diagrames of prior art circuits；Wherein, Fig. 2 (a) is
LED string output current and input voltage graph of a relation when not connecing controllable silicon dimmer；When Fig. 2 (b) is accesses controllable silicon dimmer
LED string electric current and input voltage graph of a relation；Fig. 2 (c) is circuit output current and the relation of silicon controlled dimmer for light control corner cut
Figure；
Fig. 3 is the circuit diagram of embodiment 1；
Fig. 4 is as busbar voltage V in embodiment 1LINEHigher than VLEDAnd it is less than 2*VLEDWhen, electric current moves towards signal in circuit
Figure；
Fig. 5 is as busbar voltage V in embodiment 1LINEHigher than 2*VLEDWhen, electric current moves towards schematic diagram in circuit；
Fig. 6 is I in embodiment 1STEP1、ISTEP2And ISTEP1、ISTEP2Superimposed lamp string output current IOUTWith bus electricity
Press VLINEThe oscillogram of change；
Fig. 7 is the graph of a relation of output current and silicon controlled dimmer for light control corner cut in embodiment 1；
Fig. 8 is the circuit diagram of embodiment 2.
Embodiment
Further to disclose technical scheme, embodiments of the present invention are hereby described with reference to the accompanying drawings.
Embodiment 1：
As shown in figure 3, the invention provides a kind of linear constant current circuit for controllable silicon light modulation, including controllable silicon light modulation
Device 201, rectifier bridge 202, the first linear constant current chip 203, the first current regulating resistance 204, the second linear constant current chip 205,
Second current regulating resistance 206, third linear constant current chip 207, the 3rd current regulating resistance 208, diode 209, the first LED
Lamp string 210, the second LED string 211 and maintenance current regulating resistance 212.
Wherein, controllable silicon dimmer 201 and AC-input voltage source electrical series；Two inputs of rectifier bridge 202 point
It is not electrically connected with controllable silicon dimmer 201 and AC-input voltage source；The OUT terminal of first linear constant current chip 203 and rectification
The positive output end of bridge 202 is electrically connected；One end of first current regulating resistance 204 and the REXT of the first linear constant current chip 203
End is electrically connected；The other end of first current regulating resistance 204 the GND ends with the first linear constant current chip 203, the second line respectively
The property OUT terminal of constant current chip 205 and the anode of the first LED string 210 are electrically connected；The REXT of second linear constant current chip 205
One end with the second current regulating resistance 206, the negative electrode of diode 309, one end of maintenance current regulating resistance 212 are electric respectively at end
Learn connection；The GND ends of second linear constant current chip 205 other end with the second current regulating resistance 206, the second LED respectively
The anode of string 211 is electrically connected；The anode with diode 209, maintenance current regulation are electric respectively for the negative terminal of first LED string 210
The other end of resistance 212 and the OUT terminal of third linear constant current chip 207 are electrically connected；The REXT ends of third linear constant current chip 207
One end with the 3rd current regulating resistance 208, the negative terminal of the second LED string 211 are electrically connected respectively；Third linear constant current chip
The other end with the 3rd current regulating resistance 208, the output negative terminal of rectifier bridge 202 are electrically connected respectively at 207 GND ends.
First linear constant current chip 203, the second linear constant current chip 205 and third linear constant current chip in the present embodiment
207 be single channel linear current constant control chip, can use model CL1570 or similar functions chip.The chip has three work(
Energy pin, it is respectively：OUT terminal, for chip power power supply and constant current output port；GND ends, it is chip ground end；REXT ends, it is core
Piece output current sets end.
The first LED string 210 and the second LED string 211 seal in the complete phase of the model of LED, quantity in the present embodiment
Together, it is denoted as V per the conduction voltage drop of cluster of lamps, ornamental stringLED.When circuit is started working, the brightness of all lamp strings can be accomplished unanimously, will not
When there is thyristor regulating light, the problem of lamp string brightness differs.As shown in figure 4, work as busbar voltage VLINEHigher than the pressure drop of 1 lamp string
VLEDAnd the pressure drop 2*V of less than two lamp string series connectionLEDWhen, the first linear constant current chip 203 is straight-through, you can it is considered as wire, first
The parallel connection of 210 and second LED string of LED string 211 is lighted；Flow through the electric current I of the first LED string 211LED2Size by the second line
The property current regulating resistance 206 of constant current chip 205 and second determines, total current I in parallelSTEP1Size by third linear constant current chip
207 and the 3rd current regulating resistance 208 determine；If it is desired that the electric current I of the first LED string 210 must be flowed throughLED1With flowing through second
The electric current I of LED string 211LED2It is equal in magnitude, the resistance of the second current regulating resistance 206 takes the 3rd current regulating resistance 208
Twice of resistance.
As shown in figure 5, work as busbar voltage VLINEThe pressure drop 2*V of higher than two lamp string series connectionLEDWhen, the second linear constant current core
Piece 205 and third linear constant current chip 207 are not worked, and the first LED string 210 and the series connection of the second LED string 211 are lighted；First
The electric current I of LED string 210LED1Electric current I with flowing through the second LED string 211LED2It is equal in magnitude, all be series connection total current
ISTEP2Size；ISTEP2Size determined by the first linear current regulating resistance 204 of constant current chip 203 and first；First electric current
The resistance of regulation resistance 204 is less than the resistance of the 3rd current regulating resistance 208.Current regulating resistance 212 is maintained to be mainly used in
The maintenance electric current that controllable silicon dimmer 201 is dimmed is provided, maintains the value of current regulating resistance 212 to regard specific thyristor regulating
Light device and it is different, typically can use between 10K Ω to 33K Ω.First current regulating resistance 204, the second current regulation electricity
The value of the current regulating resistance 208 of resistance 206 and the 3rd is mainly determined by the output current of design power and design.
As shown in fig. 6, whole implementing circuit can obtain very high power factor, the efficiency of whole circuit can to 85% with
On, power factor can reach more than 0.97.
As shown in fig. 7, when the input of the existing application circuit of existing market shown in the input condition and Fig. 1 of the present embodiment
When condition is identical, model, quantity summation and Fig. 1 institutes of the LED that the first LED string 210 and the second LED string 211 are sealed in
When LED string 105 in the existing application circuit of existing market shown is identical, the dimming scope of the present embodiment has exceeded existing electricity
One times of road.
Embodiment 2：
As shown in figure 8, the invention provides a kind of linear constant current circuit for controllable silicon light modulation, including controllable silicon light modulation
Device 201, rectifier bridge 202, the first linear constant current chip 203, the first current regulating resistance 204, the second linear constant current chip 205,
Second current regulating resistance 206, third linear constant current chip 207, the 3rd current regulating resistance 208, diode 209, the first LED
Lamp string 210, the second LED string 211, maintain current regulating resistance 212 and maintain current control chip 213.
Controllable silicon dimmer 201 and AC-input voltage source electrical series；Two inputs of rectifier bridge 202 respectively with can
Control silicon light modulator 201 and AC-input voltage source are electrically connected；The OUT terminal of first linear constant current chip 203 and rectifier bridge 202
Positive output end is electrically connected；One end of first current regulating resistance 204 respectively the REXT ends with the first linear constant current chip 203,
The OUT terminal of current control chip 213 is maintained to be electrically connected；The other end of first current regulating resistance 204 is linear with first respectively
The anode at the GND ends of constant current chip 203, the OUT terminal of the second linear constant current chip 205 and the first LED string 210 is electrically connected；
The REXT ends of second linear constant current chip 205 are electric with one end of the second current regulating resistance 206 and the negative electrode of diode 209 respectively
Learn connection；The GND ends of second linear constant current chip 205 other end with the second current regulating resistance 206, the second LED respectively
The anode of string 211 is electrically connected；The negative terminal of first LED string 210 anode and third linear constant current core with diode 209 respectively
The OUT terminal of piece 207 is electrically connected；The REXT ends of third linear constant current chip 207 respectively with the 3rd current regulating resistance 208 one
End, the negative terminal of the second LED string 211 are electrically connected；The GND ends of third linear constant current chip 207 respectively with the 3rd current regulation
The other end of resistance 208, the REXT ends for maintaining current control chip 213 and one end electricity company for maintaining current regulating resistance 212
Connect；Maintain the GND ends of current control chip 213 respectively with maintain current regulating resistance 212 the other end and rectifier bridge 202 it is defeated
Go out negative terminal to be electrically connected.
The circuit used in embodiment 2 and the operation principle and course of work all same of the circuit used in embodiment 1, make
Two groups of LED strings can be automatically switched according to the height of input voltage is adaptive in series system and parallel way.
This is repeated no more.In example 2 using maintain current control chip 213 and maintain current regulating resistance 212 combine offer can
Control the maintenance electric current needed for silicon light modulation.So the dimming effect of controllable silicon dimmer 201 has been strengthened.It can so provide more
Big maintenance electric current, while can the compatible more controllable silicon dimmer of different models and broader input power range.
First linear constant current chip 203, the second linear constant current chip 205, third linear constant current chip in the present embodiment
207 and to maintain current control chip 213 be single channel linear current constant control chip, model CL1570 or similar work(can be used
Can chip.The chip has three function pin, is respectively：OUT pin, for chip power power supply and current constant control port；GND pin, it is
Chip ground end；REXT pin, end is set for chip output current.
The linear constant current circuit that the LED string connection in series-parallel of controllable silicon light modulation provided by the invention adaptively switches can reach increasing
The purpose of the dimming scope of big controllable silicon light modulation, and will not increasing circuit loss, effectively reduce conversion efficiency.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (6)
- A kind of 1. linear constant current circuit for controllable silicon light modulation, it is characterised in that：Controllable silicon dimmer, rectifier bridge, First Line Property constant current chip, the first current regulating resistance, the second linear constant current chip, the second current regulating resistance, third linear constant current core Piece, the 3rd current regulating resistance, diode, the first LED string, the second LED string and maintenance current regulating module；It is described controllable Silicon light modulator and AC-input voltage source electrical series；Two inputs of rectifier bridge are respectively with controllable silicon dimmer and exchanging defeated Enter voltage source to be electrically connected；The OUT terminal of first linear constant current chip and the positive output end of rectifier bridge are electrically connected；First electric current is adjusted One end and the REXT ends of the first linear constant current chip of economize on electricity resistance are electrically connected；The other end of first current regulating resistance respectively with The anode at the GND ends of the first linear constant current chip, the OUT terminal of the second linear constant current chip and the first LED string is electrically connected；The The REXT ends of bilinear constant current chip are electrically connected with one end of the second current regulating resistance and the negative electrode of diode respectively；Second The other end with the second current regulating resistance, the anode of the second LED string are electrically connected respectively at the GND ends of linear constant current chip； The negative terminal of first LED string is electrically connected with the anode of diode and the OUT terminal of third linear constant current chip respectively；Third linear One end with the 3rd current regulating resistance, the negative terminal of the second LED string are electrically connected respectively at the REXT ends of constant current chip；3rd line The other end with the 3rd current regulating resistance, the output negative terminal of rectifier bridge are electrically connected respectively at the GND ends of property constant current chip；It is described Current regulating module is maintained to be used to provide light modulation maintenance electric current to the controllable silicon dimmer；The maintenance current regulating module bag Maintenance current regulating resistance is included, the both ends for maintaining current regulating resistance electrically connect with the negative electrode and anode of diode respectively； The resistance of first current regulating resistance is less than the resistance of the 3rd current regulating resistance, and the resistance of the second current regulating resistance is big In the resistance of the 3rd current regulating resistance.
- A kind of 2. linear constant current circuit for controllable silicon light modulation, it is characterised in that：Controllable silicon dimmer, rectifier bridge, First Line Property constant current chip, the first current regulating resistance, the second linear constant current chip, the second current regulating resistance, third linear constant current core Piece, the 3rd current regulating resistance, diode, the first LED string, the second LED string and maintenance current regulating module；It is described controllable Silicon light modulator and AC-input voltage source electrical series；Two inputs of rectifier bridge are respectively with controllable silicon dimmer and exchanging defeated Enter voltage source to be electrically connected；The OUT terminal of first linear constant current chip and the positive output end of rectifier bridge are electrically connected；First electric current is adjusted One end and the REXT ends of the first linear constant current chip of economize on electricity resistance are electrically connected；The other end of first current regulating resistance respectively with The anode at the GND ends of the first linear constant current chip, the OUT terminal of the second linear constant current chip and the first LED string is electrically connected；The The REXT ends of bilinear constant current chip are electrically connected with one end of the second current regulating resistance and the negative electrode of diode respectively；Second The other end with the second current regulating resistance, the anode of the second LED string are electrically connected respectively at the GND ends of linear constant current chip； The negative terminal of first LED string is electrically connected with the anode of diode and the OUT terminal of third linear constant current chip respectively；Third linear One end with the 3rd current regulating resistance, the negative terminal of the second LED string are electrically connected respectively at the REXT ends of constant current chip；3rd line The other end with the 3rd current regulating resistance, the output negative terminal of rectifier bridge are electrically connected respectively at the GND ends of property constant current chip；It is described Current regulating module is maintained to be used to provide light modulation maintenance electric current to the controllable silicon dimmer；The maintenance current regulating module bag Include and maintain current regulating resistance and maintain current control chip, the OUT terminal of the maintenance current control chip is electric and first is linear The REXT ends electrical connection of constant current chip；Maintain current control chip GND ends respectively with maintain current regulating resistance one end and The output negative terminal of rectifier bridge is electrically connected；The REXT ends of current control chip are maintained respectively with maintaining the another of current regulating resistance End and the GND ends of third linear constant current chip are electrically connected；The resistance of first current regulating resistance is adjusted less than the 3rd electric current The resistance of economize on electricity resistance, the resistance of the second current regulating resistance are more than the resistance of the 3rd current regulating resistance.
- 3. the linear constant current circuit according to claim 1 or 2 for controllable silicon light modulation, it is characterised in that：Described second The resistance of current regulating resistance is twice of the 3rd current regulating resistance resistance.
- 4. the linear constant current circuit according to claim 1 or 2 for controllable silicon light modulation, it is characterised in that：Described first The model of linear constant current chip, the second linear constant current chip and third linear constant current chip is CL1570.
- 5. the linear constant current circuit according to claim 2 for controllable silicon light modulation, it is characterised in that：The maintenance electric current The model CL1570 of control chip.
- A kind of 6. linear constant current circuit for controllable silicon light modulation, it is characterised in that：Controllable silicon dimmer, rectifier bridge, First Line Property constant current chip, the first current regulating resistance, the second linear constant current chip, the second current regulating resistance, third linear constant current core Piece, the 3rd current regulating resistance, diode, the first LED string, the second LED string and maintenance current regulating module；Exchange input The electric current that voltage source provides enters bus after controllable silicon dimmer and rectifier bridge successively, when busbar voltage is higher than 1 lamp string Pressure drop and during the pressure drop less than the series connection of two lamp strings, the first linear constant current chip is led directly to, the first LED string and the second LED Connection in series-parallel is lighted, and bus current is diverted to the branch road where two lamp strings, wherein electric current passes sequentially through the second line in a branch road Property constant current chip, the second current regulating resistance and the second LED string；Electric current passes sequentially through the first LED string in another branch road With third linear constant current chip, the output current of two articles of branch roads after the 3rd current regulating resistance by returning to rectifier bridge；Work as mother During the pressure drop of higher than two lamp string series connection of line voltage, the second linear constant current chip and third linear constant current chip do not work, and first LED string and the series connection of the second LED string are lighted；Bus current passes sequentially through the first linear constant current chip, the first current regulation electricity Rectifier bridge is returned to after resistance, the first LED string, diode, the second current regulating resistance and the second LED string；The maintenance electric current Adjustment module is used to provide light modulation maintenance electric current to the controllable silicon dimmer.
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