CN106341932A - Piecewise linear LED driving circuit and method - Google Patents
Piecewise linear LED driving circuit and method Download PDFInfo
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- CN106341932A CN106341932A CN201510416652.8A CN201510416652A CN106341932A CN 106341932 A CN106341932 A CN 106341932A CN 201510416652 A CN201510416652 A CN 201510416652A CN 106341932 A CN106341932 A CN 106341932A
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Abstract
The invention provides a piecewise linear LED driving circuit and a piecewise linear LED driving method. The piecewise linear LED driving circuit comprises a voltage input module which provides an input voltage, an LED lamp string, a driving voltage adjusting module which adjusts a driving voltage according to potential between both ends of an LED lamp section, a plurality of control tubes, a control module which controls on and off of each control tube through detecting an output current, and a sampling resistor. By changing the structure of a linear LED driving circuit, the piecewise linear LED driving circuit and the piecewise linear LED driving method realize high power factor and constant power output simultaneously, ensure the luminous flux output to be constant, eliminate power frequency flicker from the total light yield aspect, and improve the efficiency.
Description
Technical field
The present invention relates to IC design field, more particularly to a kind of piecewise linearity led drive circuit and method.
Background technology
Led is the semiconductor electronic component that a kind of energy lights, and this electronic component early stage can only send the HONGGUANG of low luminosity, with
The continuous progress of technology, has developed to send the degree of visible ray, infrared ray and ultraviolet, luminosity there has also been very big now
Improve.Led have the advantages that efficiency high, life-span length, not the conventional light source such as cracky, switching speed height, high reliability too late,
It has been widely used in display lamp, display and lighting field.
In order to obtain high power factor (power factor, pf) in linear led drives, generally adopt drive part by part side
Case, is illustrated in figure 1 common piecewise linearity led drive circuit 1, including Power Entry Module 11, for providing input electricity
Pressure vin；It is connected to the LED lamp string 12 of described Power Entry Module 11, in the present embodiment, described LED lamp string 12 wraps
Include the first LED lamp section d1, the second LED lamp section d2, the 3rd LED lamp section d3 and the 4th LED lamp section d4；Each led
The outfan of lamp section is connected to the current constant control end of current constant control chip 13, and the sampling end cs of described current constant control chip 13 leads to
Cross resistance r1 ground connection.But described piecewise linearity led drive circuit 1 has that power frequency flashes, and high voltage input
When inefficient.
Flash and improve efficiency to filter power frequency, generally only drive 1 section of led, be a kind of improved linear led as shown in Figure 2
Drive circuit 2, including Power Entry Module 21, for providing input voltage；It is connected to the led of described Power Entry Module 21
Lamp string 22, resistance r2 is connected to the outfan of described LED lamp string 22, and the two ends of described resistance r2 are connected to current constant control core
Piece 23；The outfan of described Power Entry Module 21 is connected to described current constant control core after electrochemical capacitor c and diode d
Piece 23, the anode of described diode d connects described electrochemical capacitor c, negative electrode connects described current constant control chip 23, described two poles
The anode of pipe d is also connected with control pipe m, and the control end of described control pipe m is connected to described current constant control chip 23；Described
Current constant control chip 23 passes through electric capacity and resistance eutral grounding respectively.Described linear led drive circuit 2 passes through the storage of electrochemical capacitor c
Improve can some efficiency to filter stroboscopic and accordingly, but therefore can reduce power factor, its power factor is 0.5～0.7.
In existing linear led drive scheme, High Power Factor and no this two performances of stroboscopic are conflict bodies it is impossible to obtain
Beautiful solution.
Content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of piecewise linearity led drive circuit and side
Method, what two performances for solving linear led drive circuit High Power Factor and no stroboscopic in prior art cannot be taken into account asks
Topic.
For achieving the above object and other related purposes, the present invention provides a kind of piecewise linearity led drive circuit, described segmented line
Property led drive circuit includes:
Control source module, LED lamp string, driving voltage adjustment module, multiple control pipe, control module and sampling resistor；
Described control source module is used for providing input voltage；
Described LED lamp series winding is connected to the outfan of described control source module, and described LED lamp string includes the multiple led connecting
Lamp section；
Described driving voltage adjustment module is connected to the two ends of a LED lamp section in described LED lamp string, for detecting described led
Two terminal potentials of lamp section, and adjust driving voltage according to two terminal potentials of described LED lamp section；
The drain terminal of described control pipe is connected to the outfan of each LED lamp section, is realized different by the conducting of different control pipes
The lighting of the LED lamp section of quantity；
Described control module is connected to source and the grid end of each control pipe, controls the conducting of each control pipe by detecting output current
And shutoff；
One end of described sampling resistor is connected to described control module, other end ground connection, for sampling to described output current.
Preferably, described driving voltage adjustment module is connected to the two ends of the LED lamp section being connected with described input voltage.
Preferably, the outfan of the LED lamp section being connected with described input voltage is connected with supply voltage generation module, for institute
Stating control module provides running voltage.
It is highly preferred that the outfan of described supply voltage generation module is also connected with a filter capacitor.
Preferably, described driving voltage adjustment module includes:
First diode, the second diode, storage capacitor and switching tube；
The negative electrode of described first diode is connected to the outfan of described control source module, and the anode of described first diode connects
In the negative electrode of described second diode, the anode of described second diode is connected to the LED lamp section being connected with described input voltage
Outfan；
The top crown of described storage capacitor is connected between described first diode and described second diode, bottom crown is connected to institute
State the input of switching tube, the outfan of described switching tube and control end connect described control module.
For achieving the above object and other related purposes, the present invention provides a kind of piecewise linearity led driving method, described segmented line
Property led driving method includes:
Start-up circuit, input voltage is gradually increasing, and storage capacitor is acted in collusion to make each other's confessions electricity to LED lamp, the control of the controlled module of each control pipe
Light corresponding LED lamp section；
Described input voltage continues to rise, when the top crown current potential that the current potential of described input voltage is higher than described storage capacitor, institute
State storage capacitor to stop power supply, acted in collusion to make each other's confessions to described LED lamp from described input voltage electric, each control pipe is controlled by described control module
System lights corresponding LED lamp section；
Described input voltage continues to rise, when the output terminal potential of the LED lamp section being connected with described input voltage is higher than described energy storage
During the top crown current potential of electric capacity, described input voltage is flowed through after the LED lamp section being connected with described input voltage to described storage capacitor
Charge, described control module is adjusted to the electric current flowing through the LED lamp section being connected with described input voltage；
The top crown current potential of described storage capacitor constantly rises with the charging of described input voltage, and described input voltage is to peaking
After be gradually reduced, when the LED lamp section being connected with described input voltage output terminal potential be less than described storage capacitor top crown electricity
During position, described input voltage stops charging to described storage capacitor, and each control pipe is subject to the control point of described control module bright corresponding
LED lamp section；
Described input voltage continues to decline, when the current potential of described input voltage is less than the top crown current potential of described storage capacitor, institute
State storage capacitor to described LED lamp statements based on collusion electricity, each control pipe is subject to the bright corresponding LED lamp section in control point of described control module；
Described input voltage continues to decline, until described input voltage is gradually increasing after dropping to zero, enters the driving in next cycle
Control.
Preferably, the minimum discharge voltage of described storage capacitor is more than the both end voltage of the LED lamp section being connected with described input voltage.
Preferably, the both end voltage of the LED lamp section being connected with described input voltage is set as the half of the peak value of described input voltage.
Preferably, the output p of described piecewise linearity led drive circuitled=i1*v1=i2*v2=...=ix*vx, wherein, i1
For output current during the first LED lamp section conducting, v1Voltage for described first LED lamp section two ends；i2For the first LED lamp
Output current during section～second LED lamp section conducting, v2Voltage for described first LED lamp section～the second LED lamp section two ends；
ixFor output current during the first LED lamp section～xth section LED lamp section conducting, vxFor described first LED lamp section～xth section
The voltage at LED lamp section two ends；First LED lamp section, the second LED lamp section～xth section LED lamp section is sequentially connected in series in described defeated
Enter the outfan of voltage；By adjusting output current so that in the case of the LED lamp section conducting of varying number, output keeps
Constant.
As described above, the piecewise linearity led drive circuit of the present invention and method, have the advantages that
The piecewise linearity led drive circuit of the present invention and method are passed through to change the structure of linear led drive circuit, realize simultaneously
High Power Factor, constant power output and no stroboscopic take into account constant, the solution in terms of luminous total amount it is ensured that output light flux
Power frequency of having determined flicker, and improve efficiency, and structure is simple, it is easy to accomplish.
Brief description
Fig. 1 is shown as piecewise linearity led drive circuit schematic diagram of the prior art.
Fig. 2 is shown as linear led drive circuit schematic diagram of the prior art.
Fig. 3 is shown as the piecewise linearity led drive circuit schematic diagram of the present invention.
Fig. 4 is shown as the piecewise linearity led driving method schematic flow sheet of the present invention.
Fig. 5～Fig. 7 is shown as the operation principle schematic diagram of the piecewise linearity led drive circuit of the present invention.
Fig. 8 is shown as each point work wave schematic diagram of the piecewise linearity led drive circuit of the present invention.
Component label instructions
1 piecewise linearity led drive circuit
11 Power Entry Modules
12 LED lamp strings
13 current constant control chips
2 linear led drive circuits
21 Power Entry Modules
22 LED lamp strings
23 current constant control chips
3 piecewise linearity led drive circuits
31 control source modules
32 LED lamp strings
33 driving voltage adjustment modules
34 control modules
Specific embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art can be disclosed by this specification
Content understand other advantages and effect of the present invention easily.The present invention can also be added by addition different specific embodiments
To implement or to apply, the every details in this specification can also be based on different viewpoints and application, in the essence without departing from the present invention
Carry out various modifications and changes under god.
Refer to Fig. 3～Fig. 8.It should be noted that the diagram provided in the present embodiment only illustrates the present invention's in a schematic way
Basic conception, then in schema only display and relevant assembly in the present invention rather than according to component count during actual enforcement, shape and
Size is drawn, and during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly layout type
State is likely to increasingly complex.
As shown in Fig. 3～Fig. 8, the present invention provides a kind of piecewise linearity led drive circuit 3, and described piecewise linearity led drives
Circuit 3 at least includes:
Control source module 31, LED lamp string 32, driving voltage adjustment module 33, multiple control pipe, control module 34 and
Sampling rcs.
As shown in figure 3, described control source module 31 is used for providing input voltage hv.
Specifically, as shown in figure 3, described control source module 31 includes the first connection end being connected to alternating voltage vin_ac
Rectifier bridge between ac1 and the second connection end ac2, described rectifier bridge is made up of 4 end to end diodes, and described second
It is connected with electric fuse f1 between connection end ac2 and described rectifier bridge.As shown in figure 8, described alternating voltage vin_ac is sine
Ripple, after described rectifier bridge, described input voltage hv is that described alternating voltage vin_ac is taken absolute value, and the cycle is described friendship
The half of stream voltage vin_ac.
As shown in figure 3, described LED lamp string 32 is connected to the outfan of described control source module 31, described LED lamp string
32 include the multiple LED lamp sections connected.
Specifically, as shown in figure 3, in the present embodiment, described LED lamp string 32 includes 4 LED lamp sections, answers actual
With in, the quantity of LED lamp section can be set as needed, be not limited with the present embodiment.The input of the first LED lamp section led1
End connects the outfan of described control source module 31, and the input of the second LED lamp section led2 connects described first LED lamp
The outfan of section led1, the input of the 3rd LED lamp section led3 connects the outfan of described second LED lamp section led2,
The input of the two or four LED lamp section led4 connects the outfan of described 3rd LED lamp section led3.Wherein, each LED lamp
The led number comprising in section can do concrete setting according to design requirement.
Described driving voltage adjustment module 33 is connected to the two ends of a LED lamp section, for detecting the two ends electricity of described LED lamp section
Position, and adjust driving voltage according to two terminal potentials of described LED lamp section.
As shown in figure 3, in the present embodiment, in order to obtain highest power factor, described driving voltage adjustment module 33 connects
Two ends in described first LED lamp section led1.Specifically, described driving voltage adjustment module 33 includes: the first diode
D1, the second diode d2, storage capacitor c1 and switching tube q5.The negative electrode of described first diode d1 is connected to described electricity
The outfan of pressure input module 31, the anode of described first diode d1 is connected to the negative electrode of described second diode d2, institute
The anode stating the second diode d2 is connected between described first LED lamp section led1 and described second LED lamp section led2；
The top crown of described storage capacitor c1 is connected between described first diode d1 and described second diode d2, bottom crown connects
It is connected to the input of described switching tube q5, the outfan of described switching tube q5 and control end connect described control module 34, institute
The outfan stating switching tube q5 is grounded after described control module 34, and the control end of described switching tube q5 is subject to described control module
The control of 34 output signal.In the present embodiment, described switching tube q5 manages for nmos, the input of described switching tube q5
Hold for drain terminal, outfan be source, control end be grid end.Described driving voltage adjustment module 33 is in described input voltage hv relatively
When low, provide electric energy to described LED lamp string 32；When described input voltage hv is sufficiently high, driving voltage adjustment module 33
Stop providing electric energy to described LED lamp string 32, provide electric energy from described input voltage hv to described LED lamp string 32；When
When described input voltage hv is too high, described input voltage hv charges to described driving voltage adjustment module 33.
As shown in figure 3, the input of each control pipe is connected to the outfan of each LED lamp section, for adjusting output current.
Specifically, as shown in figure 3, in the present embodiment, including 4 control pipes, the input of the first control pipe q1 is connected to
The outfan of described first LED lamp section led1, the input of the second control pipe q2 is connected to described second LED lamp section led2
Outfan, the input of the 3rd control pipe q3 is connected to the outfan of described 3rd LED lamp section led3, the 4th control pipe
The input of q4 is connected to the outfan of described 4th LED lamp section led4, and the outfan of each control pipe and control end are connected to
Described control module 34, the outfan of each control pipe is grounded after described control module 34, and the control end of each control pipe is by described
The control of the output signal of control module 34, described control module 34 controls the conducting of each control pipe according to the size of sample rate current
And shutoff.In the present embodiment, each control pipe is managed for nmos, the input of each control pipe is drain terminal, outfan is source,
Control end is grid end.
As shown in figure 3, described control module 34 is connected to outfan and the control end of each control pipe and described switching tube q5,
Control the turn-on and turn-off of each control pipe by detecting output current.
Specifically, as shown in figure 3, described control module 34 be connected to described first control pipe q1, described second control pipe q2,
The source of described 3rd control pipe q3, described 4th control pipe q4 and described switching tube q5 and grid end, control described first
Control pipe q1, described second control pipe q2, described 3rd control pipe q3, described 4th control pipe q4 and described switching tube
The turn-on and turn-off of q5 are to adjust output current.
As shown in figure 3, one end of described sampling resistor rcs is connected to described control module 34, other end ground connection gnd, use
In sampling to described output current.
As shown in figure 3, the outfan of described first LED lamp section led1 is also associated with supply voltage generation module 35, described electricity
Source voltage generating module 35 obtains electric energy from the drain terminal of described first control pipe q1, produces supply voltage vcc, for described
Control module 34 provides running voltage.
As shown in figure 3, the outfan of described supply voltage generation module 35 is also connected with a filter capacitor c2, described first control
Pipe q1, described second control pipe q2, described 3rd control pipe q3, described 4th control pipe q4, described switching tube q5, institute
State control module 34 and described supply voltage generation module 35 constitutes control chip, described filter capacitor c2 is located at described control
Outside the piece of coremaking piece, can supplying power for outside, simplify circuit structure.
As shown in Fig. 3～Fig. 8, the present invention provides a kind of driving method based on above-mentioned piecewise linearity led drive circuit, described
Piecewise linearity led driving method at least includes:
Step s1: start-up circuit, described input voltage hv is gradually increasing, the storage capacitor in described driving voltage adjustment module
Act in collusion to make each other's confessions to described LED lamp electric, each control pipe is subject to the bright corresponding LED lamp section in control point of described control module and adjusts output electricity
Stream.
Specifically, as shown in figs. 5 and 8, in the t0 moment, described input voltage hv is 0, the two of described storage capacitor c1
Terminal voltage is vc1, and described piecewise linearity led drive circuit 3 starts, and described input voltage hv begins to ramp up, now, institute
State the current potential less than the top crown of described storage capacitor c1 for the current potential of input voltage hv, described first diode d1 conducting, institute
State storage capacitor c1 to start to discharge, electric current, through described first diode d1, flow to described LED lamp string 32.In this enforcement
In example, the minimum discharge voltage setting described storage capacitor c1 is more than the both end voltage of described first LED lamp section led1, because
This at least ensures that described first LED lamp section led1 can be lighted, and described control module 34 controls each control pipe q1～q4 according to drive
The change on or off (conducting of synchronization only one control pipe) of galvanic electricity pressure is to light corresponding LED lamp section and to adjust output
Electric current.Described switching tube q5 conducting, forms the part LED lamp string in described LED lamp string for the described storage capacitor c1 simultaneously
One of or whole LED lamp string, then to control pipe q1～q4, then return to described storage capacitor c1 from described switching tube q5
Loop.
Step s2: described input voltage hv continues to rise, when the current potential of described input voltage hv is higher than described storage capacitor c1
Top crown current potential when, described storage capacitor c1 stops power supply, and is powered from described input voltage hv to described LED lamp string 32,
Each control pipe is subject to the bright corresponding LED lamp section in control point of described control module 34 and adjusts output current.
Specifically, as shown in Fig. 6 and Fig. 8, described input voltage hv constantly rises, the both end voltage of described storage capacitor c1
Vc1 constantly declines, and in the t1 moment, the current potential of described input voltage hv is higher than the current potential of the top crown of described storage capacitor c1,
Described first diode d1 cut-off, described storage capacitor c1 stops electric discharge, and described input voltage hv powers, and electric current is from described
Control source module 31 flows out, and flows into described LED lamp string 32, with the continuous increase of described input voltage hv, gradually leads
The quantity of logical LED lamp section is also increasing, and described control module 34 controls each control pipe q1～q4 according to the change of driving voltage
On or off (conducting of synchronization only one control pipe) is to light corresponding LED lamp section and to adjust output current.Now institute
State switching tube q5 to turn off, electric current arrives ground after flowing through described sampling resistor rcs.
Step s3: described input voltage hv continues to rise, when the output terminal potential of described first LED lamp section led1 is higher than institute
State storage capacitor c1 top crown current potential when, described input voltage hv flows through after described first LED lamp section led1 to described
Storage capacitor c1 charges, and described switching tube q5 is subject to the control of described control module 34 to flowing through described first LED lamp string led1
Electric current be adjusted.
Specifically, as shown in Figures 7 and 8, described input voltage hv constantly rises, in t2 moment, described first LED lamp
The outfan q1_d current potential of section led1 is higher than the top crown current potential of described storage capacitor c1, described second diode d2 conducting,
Described storage capacitor c1 starts to charge up, and electric current flows out from described control source module 31, flows into described first LED lamp section led1,
Flow into described storage capacitor c1 through described second diode d2 again, then through described switching tube q5 to described sampling resistor rcs
After be grounded.Now, each control pipe q1～q4 turns off, and described switching tube q5 is controlled described to flowing through by described control module 34
The electric current of the first LED lamp string led1 is adjusted.
Step s4: the top crown current potential of described storage capacitor c1 constantly rises with the charging of described input voltage hv, described
Input voltage hv is gradually reduced to after peaking, when the outfan q1_d current potential of described first LED lamp section led1 is less than institute
State storage capacitor c1 top crown current potential when, described switching tube q5 turns off, and described input voltage hv stops to described energy storage electricity
Hold c1 to charge, each control pipe is subject to the bright corresponding LED lamp section in control point of described control module 34 and adjusts output current.
Specifically, as shown in Fig. 6 and Fig. 8, described input voltage hv starts slowly to decline, in t3 after continuing to be increased to peak value
In the moment, the outfan q1_d current potential of described first LED lamp section led1 is less than the top crown current potential of described storage capacitor c1,
Described second diode d2 cut-off, described input voltage hv stops charging to described storage capacitor c1, and electric current is from described voltage
Input module 31 exports, and flows into described LED lamp string 32, and described control module 34 controls each control pipe q1～q4 according to driving
The change on or off (conducting of synchronization only one control pipe) of voltage is to light corresponding LED lamp section and to adjust output electricity
Stream.Now described switching tube q5 turns off, and electric current arrives ground after flowing through described sampling resistor rcs.
Step s5: described input voltage hv continues to decline, when the current potential of described input voltage hv is less than described storage capacitor c1
Top crown current potential when, described storage capacitor c1 powers to described LED lamp string 32, each control pipe be subject to described control module 34
The bright corresponding LED lamp section in control point and adjust output current.
Specifically, as shown in figs. 5 and 8, described input voltage hv continues to decline, in t4 moment, described input voltage
The current potential of hv is less than the top crown current potential of described storage capacitor c1, described first diode d1 conducting, described input voltage hv
Stop powering to described LED lamp string 32, electric current flows out from the top crown of described storage capacitor c1, through described first diode
D1 flows into described LED lamp string 32.In the present embodiment, the minimum discharge voltage setting described storage capacitor c1 is more than described
The both end voltage of the first LED lamp section led1, therefore at least ensures that described first LED lamp section led1 can be lighted, described control
Molding block 34 controls each control pipe q1～q4, and according to the change on or off of driving voltage, (synchronization only one control pipe is led
Logical) to light corresponding LED lamp section and to adjust output current.Described switching tube q5 conducting, forms described storage capacitor simultaneously
One of the part LED lamp string in described LED lamp string for the c1 or whole LED lamp string, then to control pipe q1～q4, then
Return to the loop of described storage capacitor c1 from described switching tube q5.
Step s6: described input voltage hv continues to decline, until described input voltage hv is gradually increasing after dropping to zero, enters
Enter the drive control in next cycle.
The piecewise linearity led drive circuit of the present invention and method have the advantages that
High Power Factor: the piecewise linearity led drive circuit of the present invention and method are electric by the two ends of described LED lamp section led1
Pressure is set to the half of the peak value of described input voltage hv, and the therefore angle of flow of input voltage is arcsin (0.5), at least from 30
～150 degree of degree, is extended the angle of flow it is possible to obtain very high power factor, can be obtained by the emulation and actual test of system,
The piecewise linearity led drive circuit of the present invention and the power factor of method > 0.9.
No stroboscopic: although the LED lamp string in the piecewise linearity led drive circuit of the present invention and method is segmentation conducting,
Arbitrarily operation time has LED lamp section conducting (led1), output when only described first LED lamp section led1 of setting turns on
Electric current is i1 (voltage at described first LED lamp section led1 two ends be v1), only described first LED lamp section led1 with
During described second LED lamp section led2 conducting, output current is i2 (described first LED lamp section led1 and described 2nd led
The voltage at lamp section led2 two ends is v2), by that analogy, described first LED lamp section led1～xth section LED lamp section ledx
During conducting, output current is ix (voltage at described first LED lamp section led1～xth section LED lamp section ledx two ends is vx),
As long as meeting pled=i1*v1=i2*v2=...=ix*vx, the output of led is all equal at any time, therefore the light of output
Flux just can keep constant, eliminates stroboscopic from luminous total amount.
High efficiency: the piecewise linearity led drive circuit of the present invention and method are Linear Driving, and the loss of system is mainly control pipe
The loss of voltage that during q1～q4 and switching tube q5 conducting, drain terminal undertakes, this programme due to the control being turned on using segmentation, defeated
Enter the LED lamp section that the voltage that control pipe during high voltage undertakes will be segmented step by step and share a part, thus reducing loss.Segmentation
Hop count is more, and whole efficiency is higher, and when input voltage is higher, efficiency lifting relatively is more.
In sum, the present invention provides a kind of piecewise linearity led drive circuit, comprising: provide the control source mould of input voltage
Block；LED lamp string；Adjust the driving voltage adjustment module of driving voltage according to two terminal potentials of the first LED lamp section；Multiple controls
Pipe；Control control module and the sampling resistor of the turn-on and turn-off of each control pipe by detecting output current.Described segmented line
Property led drive circuit operation principle include: start-up circuit, described input voltage is gradually increasing, and described driving voltage adjusts mould
Storage capacitor in block is subject to the bright corresponding LED lamp in control point of described control module to described LED lamp statements based on collusion electricity, each control pipe
Section；Described input voltage continues to rise, when the top crown current potential that the current potential of described input voltage is higher than described storage capacitor, institute
State storage capacitor to stop power supply, acted in collusion to make each other's confessions to described LED lamp from described input voltage electric, each control pipe is controlled by described control module
System lights corresponding LED lamp section；Described input voltage continues to rise, when the output terminal potential of described first LED lamp section is higher than
During the top crown current potential of described storage capacitor, described input voltage fills to described storage capacitor after flowing through described first LED lamp section
Electricity, described control module is adjusted to the electric current flowing through described first LED lamp section；The top crown current potential of described storage capacitor
Charging with described input voltage constantly rises, and is gradually reduced after described input voltage to peaking, when described first LED lamp
When the output terminal potential of section is less than the top crown current potential of described storage capacitor, described switching tube turns off, described input voltage stop to
Described storage capacitor charges, and each control pipe is subject to the bright corresponding LED lamp section in control point of described control module；Described input voltage continues
Continuous decline, when the current potential of described input voltage is less than the top crown current potential of described storage capacitor, described storage capacitor is to described led
Lamp statements based on collusion electricity, each control pipe is subject to the bright corresponding LED lamp section in control point of described control module；Described input voltage continues to decline,
Until described input voltage is gradually increasing after dropping to zero, enter the drive control in next cycle.Piecewise linearity led of the present invention
Drive circuit and method are passed through to change the structure of linear led drive circuit, are simultaneously achieved High Power Factor and constant power output,
Ensure the constant of output light flux, solve power frequency flicker in terms of luminous total amount, and improve efficiency.So, the present invention
Effectively overcome various shortcoming of the prior art and have high industrial utilization.
Above-described embodiment only principle of the illustrative present invention and its effect, not for the restriction present invention.Any it is familiar with this skill
The personage of art all can carry out modifications and changes without prejudice under the spirit and the scope of the present invention to above-described embodiment.Therefore, such as
Those of ordinary skill in the art completed under without departing from disclosed spirit and technological thought all etc.
Effect modifications and changes, must be covered by the claim of the present invention.
Claims (9)
1. a kind of piecewise linearity led drive circuit is it is characterised in that described piecewise linearity led drive circuit includes:
Control source module, LED lamp string, driving voltage adjustment module, multiple control pipe, control module and sampling electricity
Resistance；
Described control source module is used for providing input voltage；
Described LED lamp series winding is connected to the outfan of described control source module, and described LED lamp string includes the multiple of series connection
LED lamp section；
Described driving voltage adjustment module is connected to the two ends of a LED lamp section in described LED lamp string, described for detecting
Two terminal potentials of LED lamp section, and adjust driving voltage according to two terminal potentials of described LED lamp section；
The drain terminal of described control pipe is connected to the outfan of each LED lamp section, is realized by the conducting of different control pipes
The lighting of the LED lamp section of varying number；
Described control module is connected to source and the grid end of each control pipe, controls leading of each control pipe by detecting output current
Lead to and turn off；
One end of described sampling resistor is connected to described control module, other end ground connection, for adopting to described output current
Sample.
2. piecewise linearity led drive circuit according to claim 1 it is characterised in that: described driving voltage adjustment module is even
It is connected to the two ends of the LED lamp section being connected with described input voltage.
3. piecewise linearity led drive circuit according to claim 1 it is characterised in that: the led being connected with described input voltage
The outfan of lamp section is connected with supply voltage generation module, for providing running voltage to described control module.
4. piecewise linearity led drive circuit according to claim 3 it is characterised in that: described supply voltage generation module
Outfan is also connected with a filter capacitor.
5. piecewise linearity led drive circuit according to claim 1 it is characterised in that: described driving voltage adjustment module bag
Include:
First diode, the second diode, storage capacitor and switching tube；
The negative electrode of described first diode is connected to the outfan of described control source module, and the anode of described first diode is even
It is connected to the negative electrode of described second diode, the anode of described second diode is connected to the led being connected with described input voltage
The outfan of lamp section；
The top crown of described storage capacitor is connected between described first diode and described second diode, bottom crown is connected to
The input of described switching tube, the outfan of described switching tube and control end connect described control module.
6. a kind of piecewise linearity led driving method is it is characterised in that include:
Start-up circuit, input voltage is gradually increasing, and storage capacitor is acted in collusion to make each other's confessions electricity to LED lamp, the controlled module of each control pipe
The bright corresponding LED lamp section in control point；
Described input voltage continues to rise, when the top crown current potential that the current potential of described input voltage is higher than described storage capacitor,
Described storage capacitor is stopped power supply, and is acted in collusion to make each other's confessions from described input voltage to described LED lamp electric, each control pipe is subject to described control mould
The bright corresponding LED lamp section in control point of block；
Described input voltage continues to rise, when the output terminal potential of the LED lamp section being connected with described input voltage is higher than described
During the top crown current potential of storage capacitor, described input voltage is flowed through after the LED lamp section being connected with described input voltage to described
Storage capacitor charges, and described control module is adjusted to the electric current flowing through the LED lamp section being connected with described input voltage；
The top crown current potential of described storage capacitor constantly rises with the charging of described input voltage, and described input voltage reaches peak
It is gradually reduced after value, when the output terminal potential of the LED lamp section being connected with described input voltage is less than the upper of described storage capacitor
During plate potential, described input voltage stops charging to described storage capacitor, and each control pipe is subject to the control point of described control module
Bright corresponding LED lamp section；
Described input voltage continues to decline, when the current potential of described input voltage is less than the top crown current potential of described storage capacitor,
Described storage capacitor is subject to the bright corresponding LED lamp in control point of described control module to described LED lamp statements based on collusion electricity, each control pipe
Section；
Described input voltage continues to decline, until described input voltage is gradually increasing after dropping to zero, enters the drive in next cycle
Dynamic control.
7. piecewise linearity led driving method according to claim 6 it is characterised in that: the minimum electric discharge of described storage capacitor
Voltage is more than the both end voltage of the LED lamp section being connected with described input voltage.
8. piecewise linearity led driving method according to claim 6 it is characterised in that: the led being connected with described input voltage
The both end voltage of lamp section is set as the half of the peak value of described input voltage.
9. piecewise linearity led driving method according to claim 6 it is characterised in that: described piecewise linearity led drives electricity
Output the pled=i1*v1=i2*v2=...=ix*vx on road, wherein, i1For output electricity during the first LED lamp section conducting
Stream, v1Voltage for described first LED lamp section two ends；i2Defeated when turning on for the first LED lamp section～the second LED lamp section
Go out electric current, v2Voltage for described first LED lamp section～the second LED lamp section two ends；ixFor the first LED lamp section～xth
Output current during section LED lamp section conducting, vxVoltage for described first LED lamp section～xth section LED lamp section two ends；
First LED lamp section, the second LED lamp section～xth section LED lamp section is sequentially connected in series in the outfan of described input voltage；Logical
Overregulate output current so that in the case of the LED lamp section conducting of varying number, output keeps constant.
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| CN112020176A (en) * | 2019-05-29 | 2020-12-01 | 晶豪科技股份有限公司 | Driving circuit of light emitting diode |
| CN112839404A (en) * | 2019-11-25 | 2021-05-25 | 财团法人工业技术研究院 | Light emitting diode driving circuit and method |
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