CN106341932B - A kind of piecewise linearity LED drive circuit and method - Google Patents
A kind of piecewise linearity LED drive circuit and method Download PDFInfo
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- CN106341932B CN106341932B CN201510416652.8A CN201510416652A CN106341932B CN 106341932 B CN106341932 B CN 106341932B CN 201510416652 A CN201510416652 A CN 201510416652A CN 106341932 B CN106341932 B CN 106341932B
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Abstract
The present invention provides a kind of piecewise linearity LED drive circuit and method, comprising: provides the voltage input module of input voltage；LED light string；The driving voltage adjustment module of driving voltage is adjusted according to two terminal potentials of LED light section；Multiple control pipes；The control module and sampling resistor of the turn-on and turn-off of each control pipe are controlled by detection output electric current.The structure that piecewise linearity LED drive circuit of the invention and method pass through the linear LED drive circuit of change, High Power Factor and constant power output are realized simultaneously, guarantee the constant of output light flux, solves power frequency flashing in terms of luminous total amount, and improve efficiency.
Description
Technical field
The present invention relates to IC design fields, more particularly to a kind of piecewise linearity LED drive circuit and method.
Background technique
LED is a kind of semiconductor electronic component that can be luminous, and this electronic component early stage can only issue the feux rouges of low luminosity,
With the continuous progress of technology, the degree that can issue visible light, infrared ray and ultraviolet light is had developed to now, and there has also been very for luminosity
Big raising.LED has that high-efficient, the service life is long, not too late excellent of the conventional light sources such as cracky, switching speed height, high reliability
Point has been widely used in indicator light, display and lighting area.
Power factor (Power Factor, PF) high in order to obtain, generallys use drive part by part in linear LED driving
Scheme is as shown in Figure 1 common piecewise linearity LED drive circuit 1, including Power Entry Module 11, for providing input electricity
Press Vin；It is connected to the LED light string 12 of the Power Entry Module 11, in the present embodiment, the LED light string 12 includes first
LED light section D1, the second LED light section D2, third LED light section D3 and the 4th LED light section D4；The output end of each LED light section connects
Sampling end CS in the current constant control end of current constant control chip 13, the current constant control chip 13 is grounded by resistance R1.But
There is power frequency flashing in the piecewise linearity LED drive circuit 1, and inefficient when high voltage input.
It flashes and improves efficiency to filter out power frequency, usually only drive 1 section of LED, be a kind of improved linear as shown in Figure 2
LED drive circuit 2, including Power Entry Module 21, for providing input voltage；It is connected to the Power Entry Module 21
LED light string 22, resistance R2 are connected to the output end of the LED light string 22, and the both ends of the resistance R2 are connected to current constant control core
Piece 23；The output end of the Power Entry Module 21 is connected to the current constant control chip after passing through electrolytic capacitor C and diode D
The anode of 23, the diode D connect the electrolytic capacitor C, cathode connects the current constant control chip 23, the diode D
Anode be also connected with a control pipe M, the control terminal of the control pipe M is connected to the current constant control chip 23；The constant current control
Coremaking piece 23 passes through capacitor and resistance eutral grounding respectively.The linear LED drive circuit 2 is filtered out by the energy storage of electrolytic capacitor C
Stroboscopic simultaneously correspondinglys increase some efficiency, but can therefore reduce power factor, and power factor is 0.5~0.7.
High Power Factor and the two performances are a pair of contradictory bodies without stroboscopic in existing linear LED drive scheme, can not
Perfectly solved.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of piecewise linearity LED driving electricity
Road and method, can not be simultaneous for solving linear LED drive circuit High Power Factor in the prior art and two performances without stroboscopic
The problem of Gu.
In order to achieve the above objects and other related objects, the present invention provides a kind of piecewise linearity LED drive circuit, and described point
Linearly LED drive circuit includes: section
Voltage input module, LED light string, driving voltage adjustment module, multiple controls pipe, control module and sampling electricity
Resistance；
The voltage input module is for providing input voltage；
The LED light string is connected to the output end of the voltage input module, and the LED light string includes concatenated multiple
LED light section；
The driving voltage adjustment module is connected to the both ends of a LED light section in the LED light string, described for detecting
Two terminal potentials of LED light section, and driving voltage is adjusted according to two terminal potentials of the LED light section；
The drain terminal of the control pipe is connected to the output end of each LED light section, and the conducting by different control pipes is real
The LED light section of existing different number is lighted；
The control module is connected to the source and grid end of each control pipe, is managed by detection output electric current to control each control
Turn-on and turn-off；
One end of the sampling resistor be connected to the control module, the other end ground connection, for the output electric current into
Row sampling.
Preferably, the driving voltage adjustment module is connected to the both ends for the LED light section being connected with the input voltage.
Preferably, the output end for the LED light section being connected with the input voltage is connected with supply voltage generation module, is used for
Operating voltage is provided to the control module.
It is highly preferred that the output end of the supply voltage generation module is also connected with a filter capacitor.
Preferably, the driving voltage adjustment module includes:
First diode, the second diode, storage capacitor and switching tube；
The cathode of the first diode is connected to the output end of the voltage input module, the sun of the first diode
Pole is connected to the cathode of second diode, and the anode of second diode is connected to be connected with the input voltage
The output end of LED light section；
The top crown of the storage capacitor is connected between the first diode and second diode, bottom crown connects
It is connected to the input terminal of the switching tube, the output end of the switching tube connects the control module with control terminal.
In order to achieve the above objects and other related objects, the present invention provides a kind of piecewise linearity LED driving method, and described point
Linearly LED driving method includes: section
Start-up circuit, input voltage are gradually increasing, and storage capacitor is powered to LED light string, and each pipe that controls is by control module
The bright corresponding LED light section in control point；
The input voltage continues to rise, when the current potential of the input voltage is higher than the top crown current potential of the storage capacitor
When, the storage capacitor stops power supply, is powered from the input voltage to the LED light string, and each pipe that controls is by the control mould
The bright corresponding LED light section in the control point of block；
The input voltage continues to rise, when the output terminal potential for the LED light section being connected with the input voltage is higher than institute
When stating the top crown current potential of storage capacitor, the input voltage is flowed through after the LED light section being connected with the input voltage to described
The electric current for flowing through the LED light section being connected with the input voltage is adjusted in storage capacitor charging, the control module；
The top crown current potential of the storage capacitor constantly rises with the charging of the input voltage, and the input voltage arrives
It is gradually reduced after reach to peak value, when the output terminal potential for the LED light section being connected with the input voltage is lower than the storage capacitor
When top crown current potential, the input voltage stops charging to the storage capacitor, and each pipe that controls is by the control of the control module
Light corresponding LED light section；
The input voltage continues to decline, when the current potential of the input voltage is lower than the top crown current potential of the storage capacitor
When, the storage capacitor is powered to the LED light string, and each pipe that controls is by the bright corresponding LED light in control point of the control module
Section；
The input voltage continues to decline, until the input voltage is gradually increasing after dropping to zero, into next period
Drive control.
Preferably, the minimum discharge voltage of the storage capacitor is greater than the two of the LED light section being connected with the input voltage
Hold voltage.
Preferably, the both end voltage for the LED light section being connected with the input voltage is set as the peak value of the input voltage
Half.
Preferably, the output power P of the piecewise linearity LED drive circuitLED=I1*V1=I2*V2=...=Ix*Vx,
Wherein, I1Output electric current when being connected for the first LED light section, V1For the voltage at the first LED light section both ends；I2For the first LED
Output electric current when lamp section~the second LED light section conducting, V2For the first LED light section~second LED light section both ends voltage；
IXOutput electric current when being connected for the first LED light section~X section LED light section, VXFor the first LED light section~X section LED light
The voltage at section both ends；First LED light section, the second LED light section~X section LED light section are sequentially connected in series in the defeated of the input voltage
Outlet；By adjusting output electric current so that output power is kept constant in the case where the LED light section conducting of different number.
As described above, piecewise linearity LED drive circuit of the invention and method, have the advantages that
Piecewise linearity LED drive circuit of the invention and method pass through the structure for changing linear LED drive circuit, while real
High Power Factor, constant power output and taking into account without stroboscopic are showed, have guaranteed the constant of output light flux, in terms of luminous total amount
It solves power frequency flashing, and improves efficiency, and have the advantages of simple structure and easy realization.
Detailed description of the invention
Fig. 1 is shown as piecewise linearity LED drive circuit schematic diagram in the prior art.
Fig. 2 is shown as linear LED drive circuit schematic diagram in the prior art.
Fig. 3 is shown as piecewise linearity LED drive circuit schematic diagram of the invention.
Fig. 4 is shown as piecewise linearity LED driving method flow diagram of the invention.
Fig. 5~Fig. 7 is shown as the operation principle schematic diagram of piecewise linearity LED drive circuit of the invention.
Fig. 8 is shown as each point work wave schematic diagram of piecewise linearity LED drive circuit of the invention.
Component label instructions
1 piecewise linearity LED drive circuit
11 Power Entry Modules
12 LED light strings
13 current constant control chips
2 linear LED drive circuits
21 Power Entry Modules
22 LED light strings
23 current constant control chips
3 piecewise linearity LED drive circuits
31 voltage input modules
32 LED light strings
33 driving voltage adjustment modules
34 control modules
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to Fig. 3~Fig. 8.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
As shown in Fig. 3~Fig. 8, the present invention provides a kind of piecewise linearity LED drive circuit 3, the piecewise linearity LED driving
Circuit 3 includes at least:
Voltage input module 31, LED light string 32, driving voltage adjustment module 33, multiple controls pipe, control module 34 and
Sample RCS。
As shown in figure 3, the voltage input module 31 is for providing input voltage HV.
Specifically, as shown in figure 3, the voltage input module 31 includes being connected to the first connection of alternating voltage Vin_ac
The rectifier bridge between AC1 and second connection end AC2 is held, the rectifier bridge is made of 4 end to end diodes, and described second
Fuse F1 is connected between connecting pin AC2 and the rectifier bridge.As shown in figure 8, the alternating voltage Vin_ac is sine wave,
After the rectifier bridge, the input voltage HV is to take absolute value to the alternating voltage Vin_ac, and the period is the alternating current
Press the half of Vin_ac.
As shown in figure 3, the LED light string 32 is connected to the output end of the voltage input module 31, the LED light string 32
Including concatenated multiple LED light sections.
Specifically, as shown in figure 3, in the present embodiment, the LED light string 32 includes 4 LED light sections, in practical application
In, the quantity of LED light section can be set as needed, be not limited to this embodiment.The input terminal of first LED light section LED1 connects institute
The output end of voltage input module 31 is stated, the input terminal of the second LED light section LED2 connects the output of the first LED light section LED1
End, the input terminal of third LED light section LED3 connect the output end of the second LED light section LED2, the two or four LED light section LED4's
Input terminal connects the output end of the third LED light section LED3.Wherein, LED number for including in each LED light section can be according to design
It is required that doing specific setting.
The driving voltage adjustment module 33 is connected to the both ends of a LED light section, for detecting the both ends of the LED light section
Current potential, and driving voltage is adjusted according to two terminal potentials of the LED light section.
As shown in figure 3, in the present embodiment, highest power factor in order to obtain, the driving voltage adjustment module 33
It is connected to the both ends of the first LED light section LED1.Specifically, the driving voltage adjustment module 33 includes: first diode
D1, the second diode D2, storage capacitor C1 and switching tube Q5.It is defeated that the cathode of the first diode D1 is connected to the voltage
Entering the output end of module 31, the anode of the first diode D1 is connected to the cathode of the second diode D2, and described second
The anode of diode D2 is connected between the first LED light section LED1 and the second LED light section LED2；The storage capacitor
The top crown of C1 is connected between the first diode D1 and the second diode D2, bottom crown is connected to the switching tube
The input terminal of Q5, the output end of the switching tube Q5 connect the control module 34, the output of the switching tube Q5 with control terminal
End is grounded after the control module 34, the control of the control terminal of the switching tube Q5 by the output signal of the control module 34
System.In the present embodiment, the switching tube Q5 be NMOS tube, the input terminal of the switching tube Q5 is drain terminal, output end be source,
Control terminal is grid end.When the input voltage HV is lower, Xiang Suoshu LED light string 32 provides the driving voltage adjustment module 33
Electric energy；When the input voltage HV is sufficiently high, driving voltage adjustment module 33 stops providing electric energy to the LED light string 32,
Electric energy is provided from the input voltage HV to the LED light string 32；When the input voltage HV is excessively high, the input voltage HV
It charges to the driving voltage adjustment module 33.
As shown in figure 3, respectively the input terminal of control pipe is connected to the output end of each LED light section, for adjusting output electricity
Stream.
Specifically, as shown in figure 3, in the present embodiment, including 4 controls pipes, the input terminal connection of the first control pipe Q1
It is connected to the second LED light section LED2's in the input terminal of the output end of the first LED light section LED1, the second control pipe Q2
Output end, the input terminal of third control pipe Q3 are connected to the output end of the third LED light section LED3, and the 4th control pipe Q4's is defeated
Enter the output end that end is connected to the 4th LED light section LED4, the output end and control terminal of each control pipe are connected to the control
Module 34, each output end for controlling pipe are grounded after the control module 34, and each control terminal for controlling pipe is by the control module
The control of 34 output signal, the control module 34 control the turn-on and turn-off of each control pipe according to the size of sample rate current.
In the present embodiment, each control pipe is NMOS tube, and each input terminal for controlling pipe is drain terminal, output end is source, control terminal is grid
End.
As shown in figure 3, the control module 34 is connected to each control pipe and output end and the control of the switching tube Q5
End controls the turn-on and turn-off of each control pipe by detection output electric current.
Specifically, as shown in figure 3, the control module 34 is connected to the first control pipe Q1, the second control pipe
The source and grid end of Q2, third control pipe Q3, the 4th control pipe Q4 and switching tube Q5, control described first
Control pipe Q1, the second control pipe Q2, third control pipe Q3, the described 4th control the pipe Q4's and switching tube Q5
Turn-on and turn-off are to adjust output electric current.
As shown in figure 3, one end of the sampling resistor Rcs is connected to the control module 34, other end ground connection GND, use
It is sampled in the output electric current.
As shown in figure 3, the output end of the first LED light section LED1 is also connected with supply voltage generation module 35, it is described
Supply voltage generation module 35 obtains electric energy from the drain terminal of the first control pipe Q1, supply voltage VCC is generated, for described
Control module 34 provides operating voltage.
As shown in figure 3, the output end of the supply voltage generation module 35 is also connected with a filter capacitor C2, first control
Tubulation Q1, the second control pipe Q2, third control pipe Q3, the 4th control the pipe Q4, the switching tube Q5, the control
Molding block 34 and the supply voltage generation module 35 constitute control chip, and the filter capacitor C2 is located at the control chip
Piece outside, 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, institute
Piecewise linearity LED driving method is stated to include at least:
Step S1: start-up circuit, the input voltage HV are gradually increasing, the energy storage electricity in the driving voltage adjustment module
Hold to the LED light string and powers, it is each to control pipe by the bright corresponding LED light section in control point of the control module and adjust output electricity
Stream.
Specifically, as shown in figs. 5 and 8, at the t0 moment, the input voltage HV is 0, the both ends of the storage capacitor C1
Voltage is VC1, and the piecewise linearity LED drive circuit 3 starts, and the input voltage HV is begun to ramp up, at this point, the input is electric
Press the current potential of top crown of the current potential of HV lower than the storage capacitor C1, the first diode D1 conducting, the storage capacitor
C1 starts to discharge, and electric current passes through the first diode D1, flow to the LED light string 32.In the present embodiment, the storage is set
The minimum discharge voltage of energy capacitor C1 is greater than the both end voltage of the first LED light section LED1, therefore at least guarantees described first
LED light section LED1 can be lighted, and the control module 34 controls each control pipe Q1~Q4 and is connected or closes according to the variation of driving voltage
Disconnected (synchronization only one controls pipe conducting) is to light corresponding LED light section and adjust output electric current.The switching tube simultaneously
Q5 conducting forms the storage capacitor C1 and manages to the part LED light string or whole LED light strings in the LED light string, then to control
One in Q1~Q4, then return to from the switching tube Q5 circuit of the storage capacitor C1.
Step S2: the input voltage HV continues to rise, when the current potential of the input voltage HV is higher than the storage capacitor
When the top crown current potential of C1, the storage capacitor C1 stops power supply, is powered from the input voltage HV to the LED light string 32,
It is each to control pipe by the bright corresponding LED light section in control point of the control module 34 and adjust output electric current.
Specifically, as shown in Fig. 6 and Fig. 8, the input voltage HV constantly rises, the both end voltage of the storage capacitor C1
VC1 constantly declines, at the t1 moment, the current potential of top crown of the current potential higher than the storage capacitor C1 of the input voltage HV, and institute
First diode D1 cut-off is stated, the storage capacitor C1 stops electric discharge, and the input voltage HV powers, and electric current is defeated from the voltage
Enter the outflow of module 31, flows into the LED light string 32, with the continuous increase of the input voltage HV, the LED light section that is gradually turned on
Quantity also increasing, the control module 34 controls each control pipe Q1~Q4 according to the variation on or off of driving voltage
(synchronization only one controls pipe conducting) is to light corresponding LED light section and adjust output electric current.The switching tube Q5 at this time
Shutdown, electric current arrive ground after flowing through the sampling resistor Rcs.
Step S3: the input voltage HV continues to rise, when the output terminal potential of the first LED light section LED1 is higher than institute
When stating the top crown current potential of storage capacitor C1, the input voltage HV is flowed through after the first LED light section LED1 to the energy storage
Capacitor C1 charging, the switching tube Q5 by the control module 34 control to the electric current for flowing through the first LED light string LED1
It is adjusted.
Specifically, as shown in Figures 7 and 8, the input voltage HV constantly rises, at the t2 moment, the first LED light section
The output end Q1_D current potential of LED1 is higher than the top crown current potential of the storage capacitor C1, and the second diode D2 conducting is described
Storage capacitor C1 is started to charge, and electric current is flowed out from the voltage input module 31, flows into the first LED light section LED1, then pass through
It crosses the second diode D2 and flows into the storage capacitor C1, be followed by using the switching tube Q5 to the sampling resistor Rcs
Ground.At this point, respectively control pipe Q1~Q4 shutdown, the switching tube Q5 are controlled by the control module 34 to flowing through the first LED
The electric current of lamp string LED1 is adjusted.
Step S4: the top crown current potential of the storage capacitor C1 constantly rises with the charging of the input voltage HV, institute
It is gradually reduced after stating input voltage HV to reach to peak value, when the output end Q1_D current potential of the first LED light section LED1 is lower than described
When the top crown current potential of storage capacitor C1, the switching tube Q5 shutdown, the input voltage HV stops to the storage capacitor C1
Charging, it is each to control pipe by the bright corresponding LED light section in control point of the control module 34 and adjust output electric current.
Specifically, as shown in Fig. 6 and Fig. 8, the input voltage HV continues to start slowly to decline after being increased to peak value, in t3
Moment, the output end Q1_D current potential of the first LED light section LED1 are lower than the top crown current potential of the storage capacitor C1, and described the
Two diode D2 cut-off, the input voltage HV stop charging to the storage capacitor C1, and electric current is from the voltage input module
31 outputs, flow into the LED light string 32, the control module 34 controls each control pipe Q1~Q4 and leads according to the variation of driving voltage
Logical or shutdown (synchronization only one controls pipe conducting) is to light corresponding LED light section and adjust output electric current.It is described at this time
Switching tube Q5 shutdown, electric current arrive ground after flowing through the sampling resistor Rcs.
Step S5: the input voltage HV continues to decline, when the current potential of the input voltage HV is lower than the storage capacitor
When the top crown current potential of C1, the storage capacitor C1 powers to the LED light string 32, and each pipe that controls is by the control module 34
The bright corresponding LED light section in control point simultaneously adjusts output electric current.
Specifically, as shown in figs. 5 and 8, the input voltage HV continues to decline, at the t4 moment, the input voltage HV
Current potential be lower than the top crown current potential of the storage capacitor C1, first diode D1 conducting, the input voltage HV stops
It powers to the LED light string 32, electric current is flowed out from the top crown of the storage capacitor C1, is flowed by the first diode D1
The LED light string 32.In the present embodiment, the minimum discharge voltage for setting the storage capacitor C1 is greater than first LED light
The both end voltage of section LED1, therefore at least guarantee that the first LED light section LED1 can be lighted, the control module 34 controls each control
Tubulation Q1~Q4 is corresponding to light according to the variation on or off (conducting of synchronization only one control pipe) of driving voltage
LED light section simultaneously adjusts output electric current.The switching tube Q5 conducting simultaneously, forms the storage capacitor C1 into the LED light string
Part LED light string or whole LED light string, then to one in control pipe Q1~Q4, then return to from the switching tube Q5 described
The circuit of storage capacitor C1.
Step S6: the input voltage HV continues to decline, until the input voltage HV is gradually increasing after dropping to zero, into
Enter the drive control in next period.
Piecewise linearity LED drive circuit of the invention and method have the advantages that
High Power Factor: piecewise linearity LED drive circuit and method of the invention is electric by the both ends of the LED light section LED1
Pressure is set as the half of the peak value of the input voltage HV, therefore the angle of flow of input voltage is arcsin (0.5), at least from 30
~150 degree of degree, extends the angle of flow, so that it may and very high power factor is obtained, can be obtained by the emulation of system and actual test,
Power factor > 0.9 of piecewise linearity LED drive circuit and method of the invention.
No stroboscopic: although the LED light string in piecewise linearity LED drive circuit of the invention and method is segmentation conducting, but
There is LED light section that (LED1) is connected in any operation time, setting exports electric current when there was only the first LED light section LED1 conducting
For I1 (voltage at the both ends the first LED light section LED1 is V1), the only described first LED light section LED1 and the 2nd LED
Output electric current is the I2 (voltage of the first LED light section LED1 and the both ends the second LED light section LED2 when lamp section LED2 is connected
For V2), and so on, output electric current is Ix (described the when the first LED light section LED1~X section LED light section LEDx conducting
One LED light section LED1~both ends X section LED light section LEDx voltage is Vx), as long as meeting PLED=I1*V1=I2*V2=...=
Ix*Vx, the output power of LED is all equal at any time, thus export luminous flux be just able to maintain it is constant, from luminous total amount
Eliminate stroboscopic.
High efficiency: piecewise linearity LED drive circuit of the invention and method are Linear Drivings, and the loss of system is mainly controlled
The loss for the voltage that drain terminal undertakes when tubulation Q1~Q4 and switching tube Q5 is connected, control of this programme due to using segmentation conducting,
A part is shared in the LED light section that the voltage that high input voltage time control tubulation undertakes will be segmented step by step, to reduce loss.
Segmentation number of segment is more, and whole efficiency is higher, and when input voltage is higher, the opposite promotion of efficiency is more.
In conclusion the present invention provides a kind of piecewise linearity LED drive circuit, comprising: the voltage for providing input voltage is defeated
Enter module；LED light string；The driving voltage adjustment module of driving voltage is adjusted according to two terminal potentials of the first LED light section；Multiple controls
Tubulation；The control module and sampling resistor of the turn-on and turn-off of each control pipe are controlled by detection output electric current.Described point
The working principle of the linear LED drive circuit of section includes: start-up circuit, and the input voltage is gradually increasing, the driving voltage tune
Storage capacitor in section module is powered to the LED light string, and each pipe that controls is by the bright corresponding LED in control point of the control module
Lamp section；The input voltage continues to rise, when the current potential of the input voltage is higher than the top crown current potential of the storage capacitor,
The storage capacitor stops power supply, is powered from the input voltage to the LED light string, and each pipe that controls is by the control module
The bright corresponding LED light section in control point；The input voltage continues to rise, when the output terminal potential of the first LED light section is higher than
When the top crown current potential of the storage capacitor, the input voltage fills after flowing through the first LED light section to the storage capacitor
The electric current for flowing through the first LED light section is adjusted in electricity, the control module；The top crown current potential of the storage capacitor with
The charging of the input voltage constantly rise, be gradually reduced after the input voltage to reach to peak value, when the first LED light section
Output terminal potential when being lower than the top crown current potential of the storage capacitor, switching tube shutdown, the input voltage stop to
The storage capacitor charging, each pipe that controls is by the bright corresponding LED light section in control point of the control module；The input voltage after
Continuous decline, when the current potential of the input voltage is lower than the top crown current potential of the storage capacitor, the storage capacitor is to described
LED light string power supply, each pipe that controls is by the bright corresponding LED light section in control point of the control module；Under the input voltage continues
Drop, until the input voltage is gradually increasing after dropping to zero, into the drive control in next period.Piecewise linearity of the invention
LED drive circuit and method pass through the structure for changing linear LED drive circuit, while it is defeated with invariable power to realize High Power Factor
Out, guarantee the constant of output light flux, solve power frequency flashing in terms of luminous total amount, and improve efficiency.So this hair
It is bright effectively to overcome various shortcoming in the prior art and have high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (6)
1. a kind of piecewise linearity LED drive circuit, which is characterized in that the piecewise linearity LED drive circuit includes:
Voltage input module, LED light string, driving voltage adjustment module, multiple controls pipe, control module and sampling resistor；
The voltage input module is for providing input voltage；
The LED light string is connected to the output end of the voltage input module, and the LED light string includes concatenated multiple LED light
Section；
The driving voltage adjustment module is connected to the both ends for the LED light section being connected in the LED light string with the input voltage,
Driving voltage is adjusted for detecting two terminal potentials of the LED light section, and according to two terminal potentials of the LED light section；
The drain terminal of the control pipe is connected to the output end of each LED light section, is realized not by the conducting of different control pipes
LED light section with quantity is lighted；
The control module is connected to the source and grid end of each control pipe, controls leading for each control pipe by detection output electric current
Logical and shutdown；
One end of the sampling resistor is connected to the control module, other end ground connection, for adopting to the output electric current
Sample；
Wherein, the driving voltage adjustment module includes: first diode, the second diode, storage capacitor and switching tube；
The cathode of the first diode is connected to the output end of the voltage input module, and the anode of the first diode connects
It is connected to the cathode of second diode, the anode of second diode is connected to the LED light being connected with the input voltage
The output end of section；
The top crown of the storage capacitor is connected between the first diode and second diode, bottom crown is connected to
The output end of the input terminal of the switching tube, the switching tube connects the control module with control terminal.
2. piecewise linearity LED drive circuit according to claim 1, it is characterised in that: be connected with the input voltage
The output end of LED light section is connected with supply voltage generation module, for providing operating voltage to the control module.
3. piecewise linearity LED drive circuit according to claim 2, it is characterised in that: the supply voltage generation module
Output end be also connected with a filter capacitor.
4. a kind of piecewise linearity LED driving method characterized by comprising
Start-up circuit, input voltage are gradually increasing, and storage capacitor is powered to LED light string, and each pipe that controls is by the control of control module
Light corresponding LED light section；
The input voltage continues to rise, when the current potential of the input voltage is higher than the top crown current potential of the storage capacitor,
The storage capacitor stops power supply, is powered from the input voltage to the LED light string, and each pipe that controls is by the control module
The bright corresponding LED light section in control point；
The input voltage continues to rise, when the output terminal potential for the LED light section being connected with the input voltage is higher than the storage
Can capacitor top crown current potential when, the input voltage flows through after the LED light section being connected with the input voltage to the energy storage
The electric current for flowing through the LED light section being connected with the input voltage is adjusted in capacitor charging, the control module；
The top crown current potential of the storage capacitor constantly rises with the charging of the input voltage, and the input voltage reaches peak
It is gradually reduced after value, when the output terminal potential for the LED light section being connected with the input voltage is lower than the upper pole of the storage capacitor
When plate current potential, the input voltage stops charging to the storage capacitor, and each pipe that controls is lighted by the control of the control module
Corresponding LED light section；
The input voltage continues to decline, when the current potential of the input voltage is lower than the top crown current potential of the storage capacitor,
The storage capacitor is powered to the LED light string, and each pipe that controls is by the bright corresponding LED light section in control point of the control module；
The input voltage continues to decline, until the input voltage is gradually increasing after dropping to zero, into the drive in next period
Dynamic control.
5. piecewise linearity LED driving method according to claim 4, it is characterised in that: the minimum of the storage capacitor is put
Piezoelectric voltage is greater than the both end voltage for the LED light section being connected with the input voltage.
6. piecewise linearity LED driving method according to claim 4, it is characterised in that: be connected with the input voltage
The both end voltage of LED light section is set as the half of the peak value of the input voltage.
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| CN201510416652.8A CN106341932B (en) | 2015-07-15 | 2015-07-15 | A kind of piecewise linearity LED drive circuit and method |
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| CN106341932B true CN106341932B (en) | 2019-06-18 |
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| CN111642042B (en) * | 2019-03-01 | 2023-02-28 | 华润微集成电路(无锡)有限公司 | Linear LED drive circuit and drive method thereof |
| CN112020176B (en) * | 2019-05-29 | 2023-05-12 | 晶豪科技股份有限公司 | Driving circuit of light emitting diode |
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| CN103428960A (en) * | 2012-05-23 | 2013-12-04 | 朗捷科技股份有限公司 | High-power-factor flicker-free LED drive circuit |
| CN103517520A (en) * | 2013-09-10 | 2014-01-15 | 深圳市晟碟半导体有限公司 | LED driving device |
| CN103561523A (en) * | 2013-11-14 | 2014-02-05 | 合肥云杉光电科技有限公司 | Light stroboscopic resistant circuit for high PF alternating current directly-driven LED circuit |
| CN204810620U (en) * | 2015-07-15 | 2015-11-25 | 华润矽威科技（上海）有限公司 | Linear LED drive circuit of segmentation |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103428960A (en) * | 2012-05-23 | 2013-12-04 | 朗捷科技股份有限公司 | High-power-factor flicker-free LED drive circuit |
| CN103517520A (en) * | 2013-09-10 | 2014-01-15 | 深圳市晟碟半导体有限公司 | LED driving device |
| CN103561523A (en) * | 2013-11-14 | 2014-02-05 | 合肥云杉光电科技有限公司 | Light stroboscopic resistant circuit for high PF alternating current directly-driven LED circuit |
| CN204810620U (en) * | 2015-07-15 | 2015-11-25 | 华润矽威科技（上海）有限公司 | Linear LED drive circuit of segmentation |
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