CN106658879A - LED driving device and driving method therefor - Google Patents
LED driving device and driving method therefor Download PDFInfo
- Publication number
- CN106658879A CN106658879A CN201510469213.3A CN201510469213A CN106658879A CN 106658879 A CN106658879 A CN 106658879A CN 201510469213 A CN201510469213 A CN 201510469213A CN 106658879 A CN106658879 A CN 106658879A
- Authority
- CN
- China
- Prior art keywords
- module
- control
- power supply
- led drive
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The invention provides an LED driving device and a driving method therefor. The LED driving device comprises a voltage input module, a first power supply module, a first switch tube, a second power supply and load module and a control module. Via use of the LED driving device disclosed in the invention, constant current control can be realized without electric inductance, the size of the driving device can be reduced and costs can be lowered; high output efficiency can be realized in a whole working voltage scope, lossless charging can be fulfilled, and loss can be effectively reduced.
Description
Technical field
The invention belongs to field of LED drive, more particularly to a kind of LED drive device and its driving method.
Background technology
21 century pursues energy-saving and emission-reduction and environmental protection, and LED-backlit and illumination increasingly come into huge numbers of families as novel green illumination,
Although current LED schemes are compared with advantages such as conventional light source energy-saving and environmental protection life-span length small volumes, due to the high light fixture cost that generates heat
High factor, LED schemes also do not obtain substantial amounts of popularization.
In current LED-backlit or lighting driving device, most common way Switching Power Supply mode, is opened with the high frequency of inductance
Close to realize current constant control.Fig. 1 is existing typical LED illumination driving means, and the driving means include defeated by external power supply
Enter end, rectifier bridge BD1 and filter capacitor C1 composition control source module, constant-current driven chip U1, resistance Rstart, Rcs,
R3, R4 and R5, electric capacity C2, C3 and C4, sustained diode 1 are with regard to D2, inductance L1 and LED load；Wherein, the perseverance
Stream driving chip U1 includes power switch pin SW, grounding pin GND, power supply sampling end CS, chip power supply power supply VCC, feedback
Signal sampling end DET and loop compensation pin COMP, the power switch pin SW is connected with the Power Entry Module, described
Grounding pin GND is grounded.The resistance Rstart is connected to described with the resistance R5 and after the sustained diode 2 is connected
Between Power Entry Module and LED load；The resistance Rcs is connected as sampling resistor one end with the power supply sampling end CS,
The other end is connected via the inductance L1 with the LED load；After the resistance R3 and R4 series connection with the inductance L1 simultaneously
Connection；The electric capacity C3 is in parallel with the LED load；The feedback signal sampling end DET be connected to the resistance R3 and R4 it
Between；Described electric capacity C2 one end is connected with the chip power supply power supply VCC, other end ground connection；Described electric capacity C4 one end and institute
State loop compensation pin COMP to be connected, other end ground connection；The one end of the sustained diode 1 be connected to the resistance Rcs with it is described
Between power supply sampling end CS, other end ground connection.But inductance L1 used in this LED illumination driving means, using inductance L1
HF switch realize current constant control, the use cost that can cause LED illumination driving means and the volume of inductance L1 increase.
Fig. 2 is active PF linear power supplies driving means in prior art, and the driving means include external AC power supply (including fire
Line ACL and zero line ACN), rectifier bridge DB1, fuse F1, the positive pole LED+ of LED load and negative pole LED-, electrochemical capacitor
CE1, switching tube Q1, constant-current controller U1, electric capacity C1, C2 and C3, resistance R1～R9；Wherein, the constant-current controller 1
Including output pin OUT, loop compensation pin COM, grounding pin GND, chip power supply power supply VCC and power supply sampling end CS；Institute
State rectifier bridge DB1 to be connected with the external AC power supply；It is external with described that the fuse F1 is connected to the rectifier bridge DB1
On live wire ACL between AC power；One end is whole with described after the electrochemical capacitor CE1, switching tube Q1 and resistance R2 series connection
The positive output end of stream bridge DB1 is connected, and the other end is connected with the negative sense output end of the rectifier bridge DB1；The resistance R1
It is in parallel with the resistance R2；The positive pole LED+ of the LED load is connected with the positive output end of the rectifier bridge DB1；Institute
State and be connected between the positive pole LED+ of the LED load and negative pole LED- after resistance R4 and R6 series connection；The LED load it is negative
Pole LED- is connected with the output pin OUT；Described resistance R6 one end is connected with the grid of the switching tube Q1, another
End is connected with the loop compensation pin COM；Described first electric capacity C1 one end is connected with the chip power supply power supply VCC, separately
One end is grounded；Described electric capacity C2 one end is connected with the loop compensation pin COM, other end ground connection；The electric capacity C3 and institute
State electric capacity C2 in parallel；The resistance R7 is connected as sampling resistor, one end with the power supply sampling end CS, other end ground connection；
One end is connected with the negative pole LED- of the LED load after the resistance R8 and R9 is in parallel, the other end and the resistance R7 phases
Connection.But although this active PF (High Power Factor) linear power supply driving means, the circuit can guarantee that High Power Factor, but
The efficiency of the circuit is very low, and the cost of fin is increased indirectly.
The 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 LED drive device and its driving side
Method, for solving LED drive device of the prior art due to the caused cost for making LED drive device using inductance and
Volume increase problem, and using active PF linear power supplies driving means exist efficiency it is very low, increased indirectly fin into
This problem.
For achieving the above object and other related purposes, the present invention provides a kind of LED drive device, the LED drive device
Including：Control source module, the first supply module, first switch pipe, the second power supply and load blocks and control module；
The control source module, the first supply module, first switch pipe, the second power supply and load blocks are sequentially connected；It is described
Control source module is adapted to provide for input voltage；First supply module is suitable to when the first switch pipe is turned on as described the
Two power supplies and power load modules；Second power supply and load blocks include the second power supply unit and load, second power supply
Unit is connected with the load, is suitable for the load supplying；
The control module is connected with the first switch pipe and second power supply and load blocks, is suitable to according to described second
Control signal of the voltage output of power supply and load blocks output to the first switch pipe.
Used as a kind of preferred version of the LED drive device of the present invention, the control source module includes AC power and is connected to
The rectifier bridge of the AC power.
Used as a kind of preferred version of the LED drive device of the present invention, first supply module includes the first electric capacity, described the
Two power supply units include the second electric capacity.
Used as a kind of preferred version of the LED drive device of the present invention, first supply module also includes second switch pipe, institute
State second switch pipe to be connected with first supply module, be suitable to the control charged to first supply module itself.
Used as a kind of preferred version of the LED drive device of the present invention, the LED drive device also includes detection module；
The detection module is connected with the control source module and the control module, is adapted to detect for the control source module
The forward voltage values of output, and the forward voltage values for detecting are supplied to into the control module, in order to the control module root
According to control signal of the forward voltage values output to the second switch pipe.
Used as a kind of preferred version of the LED drive device of the present invention, the detection module includes first resistor and second resistance；
The first resistor connects to form cascaded structure with the second resistance, described cascaded structure one end and the control source module phase
Connection, other end ground connection.
Used as a kind of preferred version of the LED drive device of the present invention, second power supply and load blocks also include current constant control
Pipe, the current constant control pipe is connected with the load and the control module, is suitable to carry out current constant control to the load.
Used as a kind of preferred version of the LED drive device of the present invention, the LED drive device also includes sampling resistor, institute
State sampling resistor one end to be connected with the current constant control pipe, other end ground connection is suitable to the electric current for exporting the current constant control pipe
Be converted to sampled voltage.
Used as a kind of preferred version of the LED drive device of the present invention, the LED drive device also includes drive module, institute
State drive module to be connected with the control source module, the control module and the first switch pipe, be suitable to drive described the
One switching tube.
Used as a kind of preferred version of the LED drive device of the present invention, the LED drive device also includes the 3rd supply module,
It is suitable for the drive module to power.
Used as a kind of preferred version of the LED drive device of the present invention, the LED drive device also includes VCC ports and filter
Ripple electric capacity；
The VCC ports are connected with the control source module and the control module, are suitable for the control module and power；
Described filter capacitor one end is connected with the VCC ports, other end ground connection.
The present invention also provides a kind of driving method of the LED drive device described in such scheme, and the driving method is at least wrapped
Include：
The control module detects the voltage signal of second power supply and load blocks output end；
When the voltage of second power supply and load blocks output end is more than or equal to the first setting voltage VH, the first switch
Pipe is turned off, and only described second power supply unit is the load supplying；
When the voltage of second power supply and load blocks output end is less than or equal to the second setting voltage VL, the first switch
Pipe is turned on, and first supply module charges and for the load supplying for second power supply unit.
As a kind of preferred version of the driving method of the LED drive device of the present invention, first supply module and described second
Power supply unit is simultaneously for during the load supplying, the voltage of first supply module is less than the control source module
When output voltage and the 3rd setting voltage Vth, the control source module is first supply module charging, and described first supplies
When the voltage of electric module reaches the 3rd setting voltage Vth, the control source module stops being filled for first supply module
Electricity.
Used as a kind of preferred version of the driving method of the LED drive device of the present invention, the voltage of first supply module is less than
When the output voltage and the 3rd setting voltage Vth of the control source module, the control source module is the described first power supply mould
Charge for second power supply unit while block charges, and for the load supplying.
As described above, the present invention provides a kind of LED drive device and its driving method, have the advantages that：The present invention's
LED drive device does not need inductance to realize current constant control, can reduce the volume of driving means and cost-effective；Whole
There is higher delivery efficiency in operating voltage range；Charging process is lossless charging, effectively reduces loss.
Description of the drawings
Fig. 1 is shown as the schematic diagram of LED illumination driving means of the prior art.
Fig. 2 is shown as the schematic diagram of active PF linear power supplies driving means of the prior art.
Fig. 3 is shown as the attachment structure schematic diagram of each module in the LED drive device of the present invention.
Fig. 4 is shown as the circuit diagram of the LED drive device of the present invention.
Fig. 5 is shown as the working waveform figure of each several part of the LED drive device of the present invention.
Fig. 6 to Fig. 9 is shown as circuit diagram of the LED drive device of the present invention in the different operating stage.
Figure 10 is shown as the flow chart of the driving method of the LED drive device of the present invention.
Component label instructions
1 control source module
2 first supply modules
3 second power supplies and load blocks
4 control modules
5 detection modules
6 drive modules
7 the 3rd supply modules
Specific embodiment
Embodiments of the present invention are illustrated below by way of specific instantiation, those skilled in the art can be by disclosed by this specification
Content understand easily the present invention other advantages and effect.The present invention can also be added by specific embodiments different in addition
To implement or 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
Various modifications and changes are carried out under god.
Refer to Fig. 3 to Figure 10.It should be noted that the diagram provided in the present embodiment only illustrates in a schematic way the present invention
Basic conception, though only show in diagram with relevant component in the present invention rather than according to component count, shape during actual enforcement
And size is drawn, it is actual when the implementing kenel of each component, quantity and ratio can be a kind of random change, and its assembly layout
Kenel is likely to increasingly complex.
Fig. 3 to Fig. 4 is referred to, the present embodiment provides a kind of LED drive device, and the LED drive device includes：Voltage is defeated
Enter module 1, the first supply module 2, first switch pipe Q2, the second power supply and load blocks 3 and control module 4；
The control source module 1, the first supply module 2, first switch pipe Q2, the second power supply and load blocks 3 connect successively
Connect；The control source module 1 is adapted to provide for input voltage；First supply module 2 is suitable in the first switch pipe Q2
It is that the described second power supply and load blocks 3 are powered during conducting；It is described second power supply and load blocks 3 include the second power supply unit and
Load, second power supply unit is connected with the load, is suitable for the load supplying；
The control module 4 is connected with the first switch pipe Q2 and second power supply and load blocks 3, is suitable to basis
Control signal of the voltage output of second power supply and the output of load blocks 3 to the first switch pipe Q2.
As an example, the control source module 1 includes AC power, the AC power include output terminals A C1 and AC2,
Fuse F1 and rectifier bridge BD1.
As an example, output terminals A C1 of the AC power and AC2 output voltages are sinusoidal voltage, the AC power
Output terminals A C1 is connected to the rectifier bridge BD1, and output terminals A C2 is connected to the rectifier bridge BD1 via the fuse F1.
The fuse is connected between the AC power and the rectifier bridge BD1, for protecting the control source module 1；Institute
Stating rectifier bridge BD1 includes two groups of diode groups in parallel, and each diode group includes two diodes of series connection, the AC power
Output terminals A C2 be connected between two diodes of one of diode group via the fuse F1.The voltage is defeated
The output voltage for entering module 1 is the commutating voltage after sinusoidal voltage rectification, the as absolute value of sinusoidal voltage.
As an example, it is described load include at least one LED, it is preferable that in the present embodiment, it is described load include one it is specified
Voltage is the LED of 250V.
As an example, the first switch pipe Q2 can be upper switching tube, or lower switching tube.The first switch pipe
Q2 is high-end switch pipe；The first switch pipe Q2 can be PMOS or NMOS tube, it is preferable that in the present embodiment,
The first switch pipe Q2 is upper switching tube, and for NMOS tube, the drain electrode of the first switch pipe Q2 is defeated with the voltage
Enter module 1 to be connected, source electrode is connected with the load；NMOS tube has that conducting resistance is little, cost compared to PMOS
Low, easy to manufacture advantage.
As an example, first supply module 2 includes the first electric capacity C1, and second power supply unit includes the second electric capacity C2.
It is powered for the load using electric capacity as supply module, by the charge and discharge control of electric capacity, it is possible to achieve lossless charging,
It is micro- to damage electric discharge, significantly reduce the loss in the LED drive device work.Within the whole work period, described first is electric
At least one is the load uninterrupted power supply to hold C1 and the second electric capacity C2, it is ensured that described in the whole work period to load not
Flicker occurs.
As an example, first supply module 2 also includes that second switch pipe Q1, the second switch pipe Q1 can be connected to
Between the first electric capacity C1 and the control source module 1, it is also possible to be connected between the first electric capacity C1 and earth terminal；
I.e. described second switch pipe can be connected with one end with the control source module 1, and the other end is connected with the first electric capacity C1
Connect, it is also possible to which one end is connected with the first electric capacity C1, other end ground connection.
As an example, the second switch pipe Q1 can be PMOS or NMOS tube, it is preferable that in the present embodiment, institute
It is NMOS tube to state second switch pipe Q1, and the drain electrode of the second switch pipe Q1 is connected with the control source module 1,
Source ground, grid is connected with the control module 4；NMOS tube has that conducting resistance is little, cost compared to PMOS
Low, easy to manufacture advantage.
As an example, the LED drive device also includes detection module 5；The detection module 5 and the control source module
1 and the control module 4 be connected, be adapted to detect for the forward voltage values of the control source module 1 output, and will detect
Forward voltage values be supplied to the control module 4, in order to the control module 4 according to the forward voltage values export to institute
State the control signal of second switch pipe Q1.
As an example, the detection module 5 includes first resistor R1 and second resistance R2；First resistor R1 with it is described
Second resistance R2 connects to form cascaded structure, and described cascaded structure one end is connected with the control source module 1, the other end
Ground connection；Preferably, in the present embodiment, described first resistor R1 one end is connected with the control source module 1, the other end
Via second resistance R2 be grounded, the control module 4 be connected to first resistor R1 and second resistance R2 it
Between current potential.
As an example, the detection of the detection module 5 HVin voltages, when HVin voltages are less than the 3rd setting voltage Vth and described
During the output voltage of control source module 1, the second switch pipe Q1 conductings, the control source module 1 is described first
Supply module 2 charges；When HVin voltages reach the 3rd setting voltage Vth, the control module 4 controls described
Two switching tube Q1 are turned off, and the control source module 1 stops being charged for first supply module 2；Now, described first
It is constant that the magnitude of voltage of supply module 2 remains Vth.HVin voltages are detected in the detection module 5 reach the 3rd setting electricity
The second switch pipe Q1 is turned off after pressure Vth, stops being powered for first supply module 2, described first can be prevented to supply
The overtension of electric module 2, and then producing ratio larger discharge loss when avoiding being charged to second charging module 4.
As an example, second power supply and load blocks 3 also include current constant control pipe Q3, and the current constant control pipe Q3 can be with
It is any device that can realize current constant control such as triode, it is preferable that in the present embodiment, the current constant control pipe Q3 is
NMOS tube.
As an example, the current constant control pipe Q3 can be connected with the input of the load, it is also possible to the load
Output end is connected, it is preferable that in the present embodiment, and the current constant control pipe Q3 is connected with the output end of the load.More
For preferably, the drain electrode of the current constant control pipe Q3 is connected with the output end of the load, and the current constant control pipe Q3
Grid, source electrode and drain electrode are connected with the control module 4.
As an example, the LED drive device also includes a sampling resistor Rcs；One end of the sampling resistor Rcs with it is described
Current constant control pipe Q3 is connected, other end ground connection, is suitable to for the electric current that the current constant control pipe Q3 is exported to be converted to sampled voltage；
Specifically, in the present embodiment, described sampling resistor Rcs one end is connected with the source electrode of the current constant control pipe Q3, the other end
Ground connection, is suitable to for the electric current that the current constant control pipe Q3 is exported to be converted to sampled voltage Vcs.
As an example, the grid of the control module 4 and the current constant control pipe Q3, source electrode and drain electrode is connected, and with institute
The grid for stating first switch pipe Q2 is connected；The control module 4 detects the current constant control pipe Q3_D poles (i.e. constant current control
Tubulation Q3 drains) the voltage V for loading returnQ3_D(voltages of i.e. described load outputs), as the VQ3_DIt is more than
Or during equal to the first setting voltage VH, the control module 4 controls the first switch pipe Q2 and turns off, only described second
Electric capacity C2 provides electric current for the load, and now the voltage of the second electric capacity C2 begins to decline, the VQ3_DAlso with
Drop；As the VQ3_DDuring less than the second setting voltage VL, the control module 4 controls the first switch pipe Q2 conductings,
The first electric capacity C1 and the second electric capacity C2 is simultaneously the load supplying, and the first electric capacity C1 is simultaneously described
Second electric capacity C2 charges, it is ensured that the load is not in flicker.
As an example, the LED drive device also includes drive module 6, the drive module 6 and the control source module
1st, the control module 4 and the first switch pipe Q2 are connected, and are suitable to drive the shut-off of the first switch pipe Q2 and lead
It is logical.
As an example, the LED drive device also include the 3rd supply module 7, described one end of 3rd supply module 7 with it is described
Drive module 6 and external integrated BS are connected, and the other end is connected with the source electrode of the first switch pipe Q2, is suitable for
The drive module 6 is powered.Preferably, in the present embodiment, the 3rd supply module 7 includes the 3rd electric capacity C3.
As an example, the LED drive device also includes VCC ports and filter capacitor CVcc；The VCC ports and institute
State control source module 1 and the control module 4 is connected, be suitable for the control module 4 and power；The filter capacitor CVcc
One end is connected with the VCC ports, other end ground connection.
As an example, the control module 4, drive module 6, first switch pipe Q2, first switch pipe Q1, current constant control pipe
Q3 and VCC ports are integrated in a chip.
Fig. 5 is referred to, Fig. 5 is the working waveform figure of each several part of the LED drive device of the present invention.Wherein, Vin_ac is defeated
Enter the voltage of AC power, HVin is the voltage after the rectifier bridge BD1, and VC1 is the electricity at the first electric capacity C1 two ends
Pressure, VC2 is the voltage at the second electric capacity C2 two ends, and Q3_D is the voltage of the current constant control pipe Q3 drain electrodes, t0 to t5
For a work period.
At the t0 moment, input Vin_ac voltages are 0, now the voltage V of the current constant control pipe Q3 drain electrodesQ3_DThan relatively low,
The first electric capacity C1 and the second electric capacity C2 powers for LED simultaneously.With the rising of Vin_ac voltages, when t1
Carve, the voltage of the first electric capacity C1 and the second electric capacity C2 is put to minimum point, VC1=VC2=HVin.The t0 moment is to t1
As shown in fig. 6, dotted line is current path in figure, arrow represents sense of current for the sense of current at moment.
As the continuation of input Vin_ac voltages is raised, now HVin voltages are higher than the first electric capacity C1 and described second electric
Hold the voltage of C2, HVin charges for the first electric capacity C1 and the second electric capacity C2 simultaneously, and while be the LED
Power supply, the process continued to the t2 moment.The sense of current at t1 moment to t2 moment is as shown in fig. 7, dotted line is electric current road in figure
Footpath, arrow represents sense of current.
At the t2 moment, due to the rising of HVin voltages, VQ3_DIt is increased to the first setting voltage VH, the control module
4 by first switch pipe Q2 shut-offs, and the second electric capacity C2 and LED disconnects with HVin, by the C2 to institute
State LED to power.For convenience of signal, the voltage for setting the first electric capacity C1 now reaches Vth, the second switch pipe Q1
Shut-off, the first electric capacity C1 stops charge (adjustment Vth can make system reach optimum performance).Before the t3 moment,
HVin voltages are raised to peak and then begin to decline with Vin_ac changes, during this period always by the second electric capacity C2 to LED
It is powered.As shown in figure 8, dotted line is current path in figure, arrow represents the side of electric current for the sense of current at t2 to t3 moment
To.
At the t3 moment, the second electric capacity C2 is due to giving the reduction of LED supply voltages, VQ3_DVoltage declines therewith, works as VQ3_D
When voltage drops to the second setting voltage VL, the first switch pipe Q2 conductings, now due to Vin_ac voltage suppression ratios
It is relatively low, therefore HVin=VC1, the first electric capacity C1 charge and power to LED to the second electric capacity C2.Described first
Electric capacity C1 and the second electric capacity C2 voltage now is V=(VC1*C1+VC2*C2)/(C1+C2), generally chooses C1=C2,
V=(VC1+VC2)/2 can be obtained, is charged at the t4 moment and is terminated.The sense of current at t3 to t4 moment is as shown in figure 9, in figure
Dotted line is current path, and arrow represents sense of current.
At the t4 moment, although VQ3_DThere is a rising with the voltage of the second electric capacity C2, but VQ3_DVoltage is not reaching to described
First setting voltage VH, therefore the first switch pipe Q2 is open-minded always, the first electric capacity C1 and the second electric capacity C2
Power to LED simultaneously.Before t5 moment Vin_ac drop to 0, the first electric capacity C1 and the second electric capacity C2 are always
Parallel connection is powered to LED.As shown in fig. 6, dotted line is current path in figure, arrow is represented for the sense of current at t4 to t5 moment
Sense of current.
After the t5 moment, the LED drive device is started the work of next cycle and is circulated with this.
During this period, because LED has always electric current to flow through, therefore be not in the problem of any flicker.
Due to being Linear Driving, the main loss of system is in VQ3_DOn voltage, Eff ≈ VLED/ (VLED+VQ3_D), therefore
As long as the suitable first setting voltage VH of setting and the second setting voltage VL values, in the scope of whole operating voltage
The interior LED drive device can obtain very high efficiency.
Refer to Figure 10, the present invention also provides a kind of driving method of LED drive device, the LED drive device with it is above-mentioned
LED type of drive described in scheme is identical, is described again here, and the driving method at least includes：
S1：The control module detects the voltage signal of second power supply and load blocks output end；
S2：When the voltage of second power supply and load blocks output end is more than or equal to the first setting voltage VH, described first
Switching tube is turned off, and only described second power supply unit is the load supplying；
S3：When the voltage of second power supply and load blocks output end is less than or equal to the second setting voltage VL, described first
Switching tube is turned on, and first supply module charges and for the load supplying for second power supply unit.
As an example, it is described during first supply module and second power supply unit are the load supplying simultaneously
When the voltage of the first supply module is less than the output voltage and the 3rd setting voltage Vth of the control source module, the voltage is defeated
Enter module and charge for first supply module, when the voltage of first supply module reaches the 3rd setting voltage Vth,
The control source module stops as first supply module charging.
As an example, output voltage and threeth setting voltage of the voltage of first supply module less than the control source module
During Vth, the control source module is to charge for second power supply unit while first supply module charges, and is
The load supplying.
In sum, the present invention provides a kind of LED drive device and its driving method, and the LED drive device of the present invention is not required to
Want inductance to realize current constant control, the volume of driving means and cost-effective can be reduced；Have in whole operating voltage range
There is higher delivery efficiency；Charging process is lossless charging, effectively reduces loss.
The principle and its effect of above-described embodiment only illustrative present invention, not for the present invention is limited, for example, the present invention
Can also be using three epitaxial layers or many epitaxial layers.Any person skilled in the art all can be in the spirit and the scope without prejudice to the present invention
Under, modifications and changes are carried out to above-described embodiment.Therefore, such as those of ordinary skill in the art without departing from this
All equivalent modifications completed under the disclosed spirit of invention and technological thought or change, should be by the claim institute of the present invention
Cover.
Claims (14)
1. a kind of LED drive device, it is characterised in that the LED drive device includes：Control source module, the first power supply mould
Block, first switch pipe, the second power supply and load blocks and control module；
The control source module, the first supply module, first switch pipe, the second power supply and load blocks are sequentially connected；It is described
Control source module is adapted to provide for input voltage；First supply module is suitable to when the first switch pipe is turned on as described the
Two power supplies and power load modules；Second power supply and load blocks include the second power supply unit and load, second power supply
Unit is connected with the load, is suitable for the load supplying；
The control module is connected with the first switch pipe and second power supply and load blocks, is suitable to according to described second
Control signal of the voltage output of power supply and load blocks output to the first switch pipe.
2. LED drive device according to claim 1, it is characterised in that：The control source module include AC power and
It is connected to the rectifier bridge of the AC power.
3. LED drive device according to claim 1, it is characterised in that：First supply module includes the first electric capacity,
Second power supply unit includes the second electric capacity.
4. LED drive device according to claim 3, it is characterised in that：First supply module also includes second switch
Pipe, the second switch pipe is connected with first supply module, is suitable to the control charged to first supply module itself
System.
5. LED drive device according to claim 4, it is characterised in that：The LED drive device also includes detection module；
The detection module is connected with the control source module and the control module, is adapted to detect for the control source module
The forward voltage values of output, and the forward voltage values for detecting are supplied to into the control module, in order to the control module root
According to control signal of the forward voltage values output to the second switch pipe.
6. LED drive device according to claim 5, it is characterised in that：The detection module includes first resistor and second
Resistance；The first resistor connects to form cascaded structure with the second resistance, and described cascaded structure one end is defeated with the voltage
Enter module to be connected, other end ground connection.
7. LED drive device according to claim 1, it is characterised in that：Second power supply and load blocks also include perseverance
Flow control pipe, the current constant control pipe is connected with the load and the control module, is suitable to carry out constant current to the load
Control.
8. LED drive device according to claim 7, it is characterised in that：The LED drive device also includes sampling resistor,
Described sampling resistor one end is connected with the current constant control pipe, other end ground connection, is suitable to export the current constant control pipe
Electric current is converted to sampled voltage.
9. LED drive device according to claim 1, it is characterised in that：The LED drive device also includes drive module,
The drive module is connected with the control source module, the control module and the first switch pipe, is suitable to drive institute
State first switch pipe.
10. LED drive device according to claim 9, it is characterised in that：The LED drive device also includes the 3rd
Supply module, is suitable for the drive module and powers.
11. LED drive devices according to claim 1, it is characterised in that：The LED drive device also includes VCC
Port and filter capacitor；
The VCC ports are connected with the control source module and the control module, are suitable for the control module and power；
Described filter capacitor one end is connected with the VCC ports, other end ground connection.
A kind of 12. driving methods of the LED drive device as any one of claim 1 to 11, it is characterised in that institute
Stating driving method at least includes：
The control module detects the voltage signal of second power supply and load blocks output end；
When the voltage of second power supply and load blocks output end is more than or equal to the first setting voltage VH, the first switch
Pipe is turned off, and only described second power supply unit is the load supplying；
When the voltage of second power supply and load blocks output end is less than or equal to the second setting voltage VL, the first switch
Pipe is turned on, and first supply module charges and for the load supplying for second power supply unit.
The driving method of 13. LED drive devices according to claim 12, it is characterised in that：First supply module
And second power supply unit is simultaneously for during the load supplying, the voltage of first supply module is less than the electricity
When the output voltage and the 3rd setting voltage Vth of pressure input module, the control source module is filled for first supply module
Electricity, when the voltage of first supply module reaches the 3rd setting voltage Vth, the control source module stops as institute
State the charging of the first supply module.
The driving method of 14. LED drive devices according to claim 13, it is characterised in that：First supply module
Voltage less than the output voltage of the control source module and during the 3rd setting voltage Vth, the control source module is institute
State while the first supply module charges and charged for second power supply unit, and for the load supplying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510469213.3A CN106658879B (en) | 2015-08-03 | 2015-08-03 | LED drive device and its driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510469213.3A CN106658879B (en) | 2015-08-03 | 2015-08-03 | LED drive device and its driving method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106658879A true CN106658879A (en) | 2017-05-10 |
| CN106658879B CN106658879B (en) | 2019-05-21 |
Family
ID=58816024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510469213.3A Active CN106658879B (en) | 2015-08-03 | 2015-08-03 | LED drive device and its driving method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106658879B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110279045A1 (en) * | 2010-04-23 | 2011-11-17 | Rohm Co., Ltd. | Control circuit for switching power supply |
| CN203072226U (en) * | 2013-02-06 | 2013-07-17 | 深圳市芯飞凌半导体有限公司 | Dynamic-linear-control LED driving circuit |
| CN104093256A (en) * | 2014-07-28 | 2014-10-08 | 矽力杰半导体技术(杭州)有限公司 | LED drive circuit and LED drive method |
| CN204231712U (en) * | 2014-11-21 | 2015-03-25 | 上海莱托思电子科技有限公司 | A kind ofly utilize the linear constant current driver circuit for LED of the step-down of charge-discharge principle |
| CN204859676U (en) * | 2015-08-03 | 2015-12-09 | 华润矽威科技（上海）有限公司 | LED drive arrangement |
-
2015
- 2015-08-03 CN CN201510469213.3A patent/CN106658879B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110279045A1 (en) * | 2010-04-23 | 2011-11-17 | Rohm Co., Ltd. | Control circuit for switching power supply |
| CN203072226U (en) * | 2013-02-06 | 2013-07-17 | 深圳市芯飞凌半导体有限公司 | Dynamic-linear-control LED driving circuit |
| CN104093256A (en) * | 2014-07-28 | 2014-10-08 | 矽力杰半导体技术(杭州)有限公司 | LED drive circuit and LED drive method |
| CN204231712U (en) * | 2014-11-21 | 2015-03-25 | 上海莱托思电子科技有限公司 | A kind ofly utilize the linear constant current driver circuit for LED of the step-down of charge-discharge principle |
| CN204859676U (en) * | 2015-08-03 | 2015-12-09 | 华润矽威科技（上海）有限公司 | LED drive arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106658879B (en) | 2019-05-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106332390B (en) | A kind of non-isolated LED constant current driving chip, circuit and method | |
| CN104661392B (en) | A kind of LED switch constant-current drive circuit | |
| CN101657057B (en) | LED power circuit | |
| CN104871645A (en) | LED driving apparatus and driving method for continuously driving LED | |
| CN106604444A (en) | Voltage control device | |
| CN102014557A (en) | LED dimming power supply | |
| CN202127536U (en) | Constant current circuit of light-emitting diode driving device | |
| CN205124062U (en) | Starting circuit , LED driver and LED drive circuit of chip | |
| CN203675400U (en) | LED drive device, battery charger and drive control circuit thereof | |
| CN107197569A (en) | A kind of LED backlight Drive Protecting Circuit and display device | |
| CN104582183B (en) | A kind of constant current driver circuit for LED and device using step-down constant current driving unit | |
| CN206118103U (en) | Former limit feedback constant current control two -stage process dimmer circuit | |
| CN206498577U (en) | A kind of LED/light source drive control circuit inputted for electric ballast | |
| CN203590562U (en) | LED switch constant current driving circuit | |
| CN205657888U (en) | Auxiliary power circuit , LED drive circuit , LED driver | |
| CN205793546U (en) | A kind of constant current driver circuit for LED and LED light device | |
| TWI449458B (en) | Led driving system | |
| CN103338563B (en) | Alternating current LED driving circuit free from influence of power grid fluctuation | |
| CN110381637A (en) | A kind of thermal-shutdown circuit and LED lamp | |
| CN102781147A (en) | LED (Light-emitting diode) power supply circuit with high power factor | |
| CN105517244A (en) | LED (light-emitting diode) driving circuit and method for controlling conduction/cut-off time of switching power supply | |
| CN105530724A (en) | SCC-based independent dimming multi-path light emitting diode (LED) driving circuit capable of current sharing | |
| CN204859676U (en) | LED drive arrangement | |
| CN102651926B (en) | Auxiliary source circuit | |
| CN106658879A (en) | LED driving device and driving method therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210120 Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Patentee after: China Resources micro integrated circuit (Wuxi) Co., Ltd Address before: 201103 9-10 / F, building 4 (building a), No.100 Zixiu Road, Minhang District, Shanghai Patentee before: CHINA RESOURCES POWTECH (SHANGHAI) Co.,Ltd. |