CN106658879B - LED drive device and its driving method - Google Patents
LED drive device and its driving method Download PDFInfo
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- CN106658879B CN106658879B CN201510469213.3A CN201510469213A CN106658879B CN 106658879 B CN106658879 B CN 106658879B CN 201510469213 A CN201510469213 A CN 201510469213A CN 106658879 B CN106658879 B CN 106658879B
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Abstract
The present invention provides a kind of LED drive device and its driving method, and LED drive device includes: voltage input module, the first power supply module, first switch tube, the second power supply and load blocks and control module.LED drive device of the invention does not need inductance and is able to achieve current constant control, can reduce the volume and save the cost of driving device；The delivery efficiency with higher in entire operating voltage range；Charging process is lossless charging, effectively reduces loss.
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 technique
21 century pursues energy-saving and emission-reduction and environmentally protective, LED backlight and illumination as novel green illumination and increasingly comes into thousand
Ten thousand families of family, although current LED scheme grows the advantages such as small in size compared with the conventional light source energy-saving and environmental protection service life, since fever is high
Factors, the LED schemes such as lamps and lanterns are at high cost are largely popularized not yet.
In current LED backlight or lighting driving device, most common way Switching Power Supply mode is the height with inductance
Frequency switch is to realize current constant control.Fig. 1 is existing typical LED illumination driving device, and the driving device includes by external electricity
Source input terminal, rectifier bridge BD1 and filter capacitor C1 composition voltage input module, constant-current driven chip U1, resistance Rstart,
Rcs, R3, R4 and R5, capacitor C2, C3 and C4, sustained diode 1 are with regard to D2, inductance L1 and LED load；Wherein, the constant current is driven
Dynamic chip U1 includes that power switch foot SW, grounding pin GND, power supply sampling end CS, chip power supply VCC, feedback signal are adopted
Sample end DET and loop compensation foot COMP, the power switch foot SW are connected with the Power Entry Module, the grounding pin
GND ground connection.The resistance Rstart is connected to the power input after connecting with the resistance R5 and the sustained diode 2
Between module and LED load；The resistance Rcs is connected as sampling resistor one end with the power supply sampling end CS, the other end
It is connected via the inductance L1 with the LED load；It is in parallel with the inductance L1 after the resistance R3 and R4 series connection；The electricity
It is in parallel with the LED load to hold C3；The feedback signal sampling end DET is connected between the resistance R3 and R4；The capacitor
The one end C2 is connected with the chip power supply VCC, other end ground connection；The one end the capacitor C4 and the loop compensation foot
COMP is connected, other end ground connection；Described 1 one end of sustained diode be connected to the resistance Rcs and the power supply sampling end CS it
Between, other end ground connection.But inductance L1 is used in this LED illumination driving device, has been realized using the HF switch of inductance L1 permanent
Flow control, inductance L1's uses meeting so that the cost and volume of LED illumination driving device increase.
Fig. 2 is that active PF linear power supply driving device, the driving device include external AC power source (packet in the prior art
Include firewire ACL and zero curve ACN), rectifier bridge DB1, fuse F1, LED load positive LED+ and cathode LED-, electrolytic capacitor
CE1, switching tube Q1, constant-current controller U1, capacitor C1, C2 and C3, resistance R1~R9；Wherein, the constant-current controller 1 includes defeated
Pin OUT, loop compensation foot COM, grounding pin GND, chip power supply VCC and power supply sampling end CS out；The rectifier bridge
DB1 is connected with the external AC power source；The fuse F1 is connected to the rectifier bridge DB1 and the external AC power source
Between firewire ACL on；One end and the rectifier bridge DB1 be just after the electrolytic capacitor CE1, switching tube Q1 and resistance R2 series connection
It is connected to output end, the other end is connected with the negative sense output end of the rectifier bridge DB1；The resistance R1 and resistance R2
It is in parallel；The positive LED+ of the LED load is connected with the positive output end of the rectifier bridge DB1；The resistance R4 and R6 string
It is connected to after connection between the positive LED+ of the LED load and cathode LED-；The cathode LED- of the LED load and the output
Pin OUT is connected；The one end the resistance R6 is connected with the grid of the switching tube Q1, the other end and the loop compensation foot
COM is connected；The one end the first capacitor C1 is connected with the chip power supply VCC, other end ground connection；The capacitor C2
One end is connected with the loop compensation foot COM, other end ground connection；The capacitor C3 is in parallel with the capacitor C2；The resistance
R7 is connected as sampling resistor, one end with the power supply sampling end CS, other end ground connection；The resistance R8 and R9 parallel connection are latter
End is connected with the cathode LED- of the LED load, and the other end is connected with the resistance R7.But this active PF (high power
Factor) linear power supply driving device, although which can guarantee High Power Factor, but the efficiency of the circuit is very low, increase indirectly
The cost of cooling fin.
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 LED drive device and its drives
Dynamic method, for solving cost of the LED drive device in the prior art due to making LED drive device caused by using inductance
And the problem of volume increase, and it is very low using efficiency existing for active PF linear power supply driving device, heat dissipation is increased indirectly
The problem of piece cost.
In order to achieve the above objects and other related objects, the present invention provides a kind of LED drive device, the LED driving dress
Set includes: voltage input module, the first power supply module, first switch tube, the second power supply and load blocks and control module；
The voltage input module, the first power supply module, first switch tube, the second power supply and load blocks are sequentially connected；
The voltage input module is adapted to provide for input voltage；First power supply module is suitable in first switch tube conducting
Second power supply and power load modules；Second power supply and load blocks include the second power supply unit and load, described
Second power supply unit is connected with the load, is suitable for the load supplying；
The control module is connected with the first switch tube and second power supply and load blocks, is suitable for according to institute
The voltage output of the second power supply and load blocks output is stated to the control signal of the first switch tube.
As a kind of preferred embodiment of LED drive device of the invention, the voltage input module include AC power source and
It is connected to the rectifier bridge of the AC power source.
As a kind of preferred embodiment of LED drive device of the invention, first power supply module includes first capacitor, institute
Stating the second power supply unit includes the second capacitor.
As a kind of preferred embodiment of LED drive device of the invention, first power supply module further includes second switch
Pipe, the second switch is connected with first power supply module, suitable for the control charged to first power supply module itself
System.
As a kind of preferred embodiment of LED drive device of the invention, the LED drive device further includes detection module；
The detection module is connected with the voltage input module and the control module, and it is defeated to be adapted to detect for the voltage
Enter the forward voltage values of module output, and the forward voltage values that will test are supplied to the control module, in order to the control
Molding root tuber exports the control signal to the second switch according to the forward voltage values.
As a kind of preferred embodiment of LED drive device of the invention, 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 and the voltage are defeated
Enter module to be connected, other end ground connection.
As a kind of preferred embodiment of LED drive device of the invention, second power supply and load blocks further include perseverance
Flow control tubulation, the current constant control pipe are connected with the load and the control module, are suitable for carrying out constant current to the load
Control.
As a kind of preferred embodiment of LED drive device of the invention, the LED drive device further includes sampling resistor,
Described sampling resistor one end is connected with the current constant control pipe, other end ground connection, suitable for export the current constant control pipe
Electric current is converted to sampled voltage.
As a kind of preferred embodiment of LED drive device of the invention, the LED drive device further includes drive module,
The drive module is connected with the voltage input module, the control module and the first switch tube, is suitable for driving institute
State first switch tube.
As a kind of preferred embodiment of LED drive device of the invention, the LED drive device further includes third power supply mould
Block is suitable for the drive module power supply.
As a kind of preferred embodiment of LED drive device of the invention, the LED drive device further include the port VCC and
Filter capacitor；
The port VCC is connected with the voltage input module and the control module, is suitable for the control module
Power supply；
Described filter capacitor one end is connected with the port VCC, other end ground connection.
The present invention also provides a kind of driving method of LED drive device described in above scheme, the driving method is extremely
Include: less
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 greater than or equal to the first setting voltage VH, described first
Switching tube shutdown, only described second power supply unit are 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, described first
Switching tube conducting, first power supply module is that second power supply unit charges and is the load supplying.
A kind of preferred embodiment of driving method as LED drive device of the invention, first power supply module and institute
During stating the second power supply unit while being the load supplying, it is defeated that the voltage of first power supply module is less than the voltage
When entering the output voltage and third setting voltage Vth of module, the voltage input module is first power supply module charging, institute
When stating the voltage of the first power supply module and reaching third setting voltage Vth, the voltage input module stops being described first
Power supply module charging.
A kind of preferred embodiment of driving method as LED drive device of the invention, the electricity of first power supply module
When pressure is less than the output voltage and third setting voltage Vth of the voltage input module, the voltage input module is described the
It charges while one power supply module charges for second power supply unit, and is the load supplying.
As described above, the present invention provides a kind of LED drive device and its driving method, this hair is had the advantages that
Bright LED drive device does not need inductance and is able to achieve current constant control, can reduce the volume and save the cost of driving device；?
Delivery efficiency with higher in entire operating voltage range；Charging process is lossless charging, effectively reduces loss.
Detailed description of the invention
Fig. 1 is shown as the schematic diagram of LED illumination driving device in the prior art.
Fig. 2 is shown as the schematic diagram of active PF linear power supply driving device in the prior art.
Fig. 3 is shown as the attachment structure schematic diagram of each module in LED drive device of the invention.
Fig. 4 is shown as the circuit diagram of LED drive device of the invention.
Fig. 5 is shown as the working waveform figure of each section of LED drive device of the invention.
Fig. 6 to Fig. 9 is shown as the circuit diagram of LED drive device of the invention in the different operating stage.
Figure 10 is shown as the flow chart of the driving method of LED drive device of the invention.
Component label instructions
1 voltage input module
2 first power supply modules
3 second power supplies and load blocks
4 control modules
5 detection modules
6 drive modules
7 third power supply 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.
Fig. 3 is please referred to Figure 10.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, though only show in diagram 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.
Fig. 3 to Fig. 4 is please referred to, the present embodiment provides a kind of LED drive device, the LED drive device includes: that voltage is defeated
Enter module 1, the first power supply module 2, first switch tube Q2, the second power supply and load blocks 3 and control module 4；
The voltage input module 1, the first power supply module 2, first switch tube Q2, the second power supply and load blocks 3 are successively
Connection；The voltage input module 1 is adapted to provide for input voltage；First power supply module 2 is suitable in the first switch tube
It powers when Q2 is connected for second power supply and load blocks 3；Second power supply and load blocks 3 include the second power supply unit
And load, second power supply unit are connected with the load, are suitable for the load supplying；
The control module 4 is connected with the first switch tube Q2 and second power supply and load blocks 3, is suitable for root
According to the voltage output of second power supply and the output of load blocks 3 to the control signal of the first switch tube Q2.
As an example, the voltage input module 1 includes AC power source, the AC power source include output terminals A C1 with
AC2, fuse F1 and rectifier bridge BD1.
As an example, output terminals A C1 and the AC2 output voltage of the AC power source is sinusoidal voltage, the AC power source
Output terminals A C1 be connected to the rectifier bridge BD1, output terminals A C2 is connected to the rectifier bridge BD1 via the fuse F1.
The fuse is connected between the AC power source and the rectifier bridge BD1, for protecting the voltage input module 1；Institute
Stating rectifier bridge BD1 includes two groups of diode groups in parallel, and each diode group includes concatenated two diodes, the AC power source
Output terminals A C2 be connected between two diodes of one of diode group via the fuse F1.The voltage is defeated
Enter the output voltage of module 1 for the rectified voltage after sinusoidal voltage commutation, the as absolute value of sinusoidal voltage.
As an example, the load includes at least one LED, it is preferable that in the present embodiment, the load includes a volume
Constant voltage is the LED of 250V.
As an example, the first switch tube Q2 can be upper switch pipe, or lower switch pipe.The first switch
Pipe Q2 is high-end switch pipe；The first switch tube Q2 can be PMOS tube or NMOS tube, it is preferable that described in the present embodiment
First switch tube Q2 is upper switch pipe, and is NMOS tube, the drain electrode of the first switch tube Q2 and 1 phase of voltage input module
Connection, source electrode are connected with the load；NMOS tube has conducting resistance small, at low cost, easy to manufacture compared to PMOS tube
Advantage.
As an example, first power supply module 2 includes first capacitor C1, second power supply unit includes the second capacitor
C2.Using capacitor as power supply module is that the load is powered, and by the charge and discharge control of capacitor, lossless fill may be implemented
Electricity, micro- damage electric discharge significantly reduce the loss in the LED drive device work.Within the entire duty cycle, described first
Capacitor C1 and the second capacitor C2 at least one be the load uninterrupted power supply, it is ensured that the load in the entire duty cycle
It is not in flashing.
As an example, first power supply module 2 further includes second switch Q1, the second switch Q1 be can connect
Between the first capacitor C1 and the voltage input module 1, also can connect in the first capacitor C1 and ground terminal it
Between；The i.e. described second switch can be connected with one end with the voltage input module 1, the other end and the first capacitor C1 phase
Connection, can also be connected with one end with the first capacitor C1, other end ground connection.
As an example, the second switch Q1 can be PMOS tube or NMOS tube, it is preferable that described in the present embodiment
Second switch Q1 is NMOS tube, and the drain electrode of the second switch Q1 is connected with the voltage input module 1, and source electrode connects
Ground, grid are connected with the control module 4；NMOS tube has conducting resistance small, at low cost, easy to manufacture compared to PMOS tube
The advantages of.
As an example, the LED drive device further includes detection module 5；The detection module 5 and the voltage input mould
Block 1 and the control module 4 are connected, and are adapted to detect for the forward voltage values that the voltage input module 1 exports, and will test
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 Q1.
As an example, the detection module 5 includes first resistor R1 and second resistance R2；The 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 voltage input module 1, another termination
Ground；Preferably, in the present embodiment, the one end the first resistor R1 is connected with the voltage input module 1, and the other end is via institute
Second resistance R2 ground connection is stated, the control module 4 is connected to the current potential between the first resistor R1 and the second resistance R2.
As an example, the detection module 5 detects HVin voltage, when HVin voltage is less than third setting voltage Vth and institute
When stating the output voltage of voltage input module 1, the second switch Q1 conducting, the voltage input module 1 is described first
Power supply module 2 charges；When HVin voltage reaches the third setting voltage Vth, the control module 4 controls described second and opens
Pipe Q1 shutdown is closed, the voltage input module 1 stops being that first power supply module 2 charges；At this point, first power supply module
It is constant that 2 voltage value remains Vth.It is closed after the detection module 5 detects that HVin voltage reaches third setting voltage Vth
Break the second switch Q1, stops powering for first power supply module 2, can prevent the electricity of first power supply module 2
Height is pressed through, and then avoids generating bigger discharge loss when charging to second charging module 4.
As an example, second power supply and load blocks 3 further include current constant control pipe Q3, the current constant control pipe Q3 can
To be any device for being able to achieve 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 terminal of the load, can also be born with described
The output end of load is connected, it is preferable that in the present embodiment, the current constant control pipe Q3 is connected with the output end of the load.
It is further preferable that 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 be connected with the control module 4.
As an example, the LED drive device further includes a sampling resistor Rcs；One end of the sampling resistor Rcs and institute
It states current constant control pipe Q3 to be connected, other end ground connection, the electric current suitable for exporting the current constant control pipe Q3 is converted to sampling electricity
Pressure；Specifically, the one end the sampling resistor Rcs is connected with the source electrode of the current constant control pipe Q3, the other end in the present embodiment
Ground connection, the electric current suitable for exporting the current constant control pipe Q3 are converted to sampled voltage Vcs.
As an example, the control module 4 is connected with the grid of the current constant control pipe Q3, source electrode and drain electrode, and with
The grid of the first switch tube Q2 is connected；The control module 4 detects the pole current constant control pipe Q3_D (i.e. current constant control
Pipe Q3 drain electrode) it is described load return voltage VQ3_D(voltages of the i.e. described load outputs), as the VQ3_DMore than or equal to
When one setting voltage VH, the control module 4 controls the first switch tube Q2 shutdown, and the only described second capacitor C2 is described
Load provides electric current, and the voltage of the second capacitor C2 is begun to decline at this time, the VQ3_DAlso decline therewith；As the VQ3_DIt is low
When the second setting voltage VL, the control module 4 controls first switch tube Q2 conducting, the first capacitor C1 and described
Second capacitor C2 is the load supplying simultaneously, and the first capacitor C1 is the second capacitor C2 charging simultaneously, it is ensured that institute
Stating load is not in flashing.
As an example, the LED drive device further includes drive module 6, the drive module 6 and the voltage input mould
Block 1, the control module 4 and the first switch tube Q2 are connected, suitable for driving the shutdown of the first switch tube Q2 and leading
It is logical.
As an example, the LED drive device further includes third power supply module 7, described 7 one end of third power supply module and institute
It states drive module 6 and external integrated BS is connected, the other end is connected with the source electrode of the first switch tube Q2, is suitable for
The drive module 6 is powered.Preferably, in the present embodiment, the third power supply module 7 includes third capacitor C3.
As an example, the LED drive device further includes the port VCC and filter capacitor CVcc；The port VCC with it is described
Voltage input module 1 and the control module 4 are connected, and are suitable for the control module 4 and power；The filter capacitor CVcc mono-
End is connected with the port VCC, other end ground connection.
As an example, the control module 4, drive module 6, first switch tube Q2, first switch tube Q1, current constant control pipe
The port Q3 and VCC is integrated in a chip.
Referring to Fig. 5, Fig. 5 is the working waveform figure of each section of LED drive device of the invention.Wherein, Vin_ac is
The voltage of input ac power, HVin are the voltage after the rectifier bridge BD1, and VC1 is the voltage at the both ends the first capacitor C1,
VC2 is the voltage at the both ends the second capacitor C2, and Q3_D is the voltage of current constant control pipe Q3 drain electrode, and t0 to t5 is a work
Make the period.
At the t0 moment, inputting Vin_ac voltage is 0, at this time the voltage V of the current constant control pipe Q3 drain electrodeQ3_DIt is relatively low,
The first capacitor C1 and the second capacitor C2 is LED power supply simultaneously.With the raising of Vin_ac voltage, until the t1 moment,
The voltage of the first capacitor C1 and the second capacitor C2 are put to minimum point, VC1=VC2=HVin.T0 moment to the t1 moment
Current direction as shown in fig. 6, dotted line is current path in figure, arrow indicates sense of current.
Continue to increase with input Vin_ac voltage, HVin voltage is higher than the first capacitor C1 and described second at this time
The voltage of capacitor C2, HVin is the first capacitor C1 and the second capacitor C2 charging simultaneously, and is supplied simultaneously for the LED
Electricity, the process continued to the t2 moment.The current direction at t1 moment to t2 moment as shown in fig. 7, dotted line is current path in figure,
Arrow indicates sense of current.
At the t2 moment, due to the raising of HVin voltage, VQ3_DIt is increased to the first setting voltage VH, the control module
4 turn off the first switch tube Q2, and the second capacitor C2 and the LED are disconnected with HVin, are supplied by the C2 the LED
Electricity.For convenience of signal, the voltage for setting the first capacitor C1 reaches Vth at this time, the second switch Q1 shutdown, and described the
One capacitor C1 stops charging (adjustment Vth can make system reach optimum performance).Until the t3 moment, HVin voltage is with Vin_ac
Variation is raised to highest point and then begins to decline, and is powered during this period by the second capacitor C2 to LED always.When t2 to t3
For the current direction at quarter as shown in figure 8, dotted line is current path in figure, arrow indicates sense of current.
At the t3 moment, the second capacitor C2 to LED supply voltage due to reducing, VQ3_DVoltage declines therewith, works as VQ3_DElectricity
When pressure drop is to the second setting voltage VL, first switch tube Q2 conducting, at this time due to Vin_ac voltage decline it is relatively low,
Therefore HVin=VC1, the first capacitor C1 charge to the second capacitor C2 and power to LED.The first capacitor C1 and
The voltage of the second capacitor C2 at this time is V=(VC1*C1+VC2*C2)/(C1+C2), usually selection C1=C2, available V
=(VC1+VC2)/2, charging at the t4 moment terminates.The current direction at t3 to t4 moment is as shown in figure 9, dotted line is electric current in figure
Path, arrow indicate sense of current.
At the t4 moment, although VQ3_DThere is a rising with the voltage of the second capacitor C2, but VQ3_DVoltage does not reach described
First setting voltage VH, therefore the first switch tube Q2 is open-minded always, the first capacitor C1 and the second capacitor C2 are same
When give LED power supply.Before t5 moment Vin_ac drops to 0, the first capacitor C1 and the second capacitor C2 parallel connection always are given
LED power supply.For the current direction at t4 to t5 moment as shown in fig. 6, dotted line is current path in figure, arrow indicates the side of electric current
To.
After the t5 moment, the LED drive device is started the work of next cycle and is recycled with this.
During this period, the problem of thering is electric current to flow through always due to LED, be not in any flashing.
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 value, in the range of entire operating voltage
The LED drive device can obtain very high efficiency.
Referring to Fig. 10, the present invention also provides a kind of driving method of LED drive device, the LED drive device with it is upper
It is identical to state LED driving method described in scheme, is described again here, the driving method includes at least:
S1: the control module detects the voltage signal of second power supply and load blocks output end；
S2: described when the voltage of second power supply and load blocks output end is greater than or equal to the first setting voltage VH
First switch tube shutdown, only described second power supply unit are the load supplying；
S3: described when the voltage of second power supply and load blocks output end is less than or equal to the second setting voltage VL
First switch tube conducting, first power supply module is that second power supply unit charges and is the load supplying.
As an example, first power supply module and second power supply unit are the process of the load supplying simultaneously
In, when the voltage of first power supply module is less than the output voltage and third setting voltage Vth of the voltage input module, institute
Voltage input module is stated as first power supply module charging, the voltage of first power supply module reaches the third setting electricity
When pressing Vth, the voltage input module stops being that first power supply module charges.
As an example, the voltage of first power supply module is less than the output voltage of the voltage input module and third is set
When constant voltage Vth, the voltage input module is that second power supply unit fills while being first power supply module charging
Electricity, and be the load supplying.
In conclusion the present invention provides a kind of LED drive device and its driving method, LED drive device of the invention is not
It needs inductance to be able to achieve current constant control, can reduce the volume and save the cost of driving device；In entire operating voltage range
Interior delivery efficiency with higher；Charging process is lossless charging, effectively reduces loss.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention, for example, this
Invention can also use three epitaxial layers or more epitaxial layers.Any person skilled in the art all can be without prejudice to spirit of the invention
Under the scope of and, carry out modifications and changes to above-described embodiment.Therefore, such as those of ordinary skill in the art not
All equivalent modifications or change completed under disclosed spirit and technical idea are detached from, it should be by power of the invention
Benefit requires to be covered.
Claims (14)
1. a kind of LED drive device, which is characterized in that the LED drive device includes: voltage input module, the first power supply mould
Block, first switch tube, the second power supply and load blocks and control module；
The voltage input module, the first power supply module, first switch tube, the second power supply and load blocks are sequentially connected；It is described
Voltage input module is adapted to provide for input voltage；First power supply module is suitable in first switch tube conducting being described
Second power supply and power load modules；It is described second power supply and load blocks include the second power supply unit and load, described second
Power supply unit is connected with the load, is suitable for the load supplying；
The control module and the first switch tube and second power supply and load blocks are connected, and are suitable for according to described the
Control signal of the voltage output of two power supplies and load blocks output to the first switch tube.
2. LED drive device according to claim 1, it is characterised in that: the voltage input module includes AC power source
And it is connected to the rectifier bridge of the AC power source.
3. LED drive device according to claim 1, it is characterised in that: first power supply module includes first capacitor,
Second power supply unit includes the second capacitor.
4. LED drive device according to claim 3, it is characterised in that: first power supply module further includes second opening
Guan Guan, the second switch are connected with first power supply module, suitable for what is charged to first power supply module itself
Control.
5. LED drive device according to claim 4, it is characterised in that: the LED drive device further includes detection mould
Block；
The detection module is connected with the voltage input module and the control module, is adapted to detect for the voltage input mould
The forward voltage values of block output, and the forward voltage values that will test are supplied to the control module, in order to the control mould
Root tuber exports the control signal to the second switch according to the forward voltage values.
6. LED drive device according to claim 5, it is characterised in that: the detection module includes first resistor and
Two resistance；The first resistor connects to form cascaded structure with the second resistance, described cascaded structure one end and the voltage
Input module is connected, other end ground connection.
7. LED drive device according to claim 1, it is characterised in that: second power supply and load blocks further include
Current constant control pipe, the current constant control pipe are connected with the load and the control module, are suitable for carrying out the load permanent
Flow control.
8. LED drive device according to claim 7, it is characterised in that: the LED drive device further includes sampling electricity
Resistance, described sampling resistor one end are connected with the current constant control pipe, and other end ground connection is suitable for exporting the current constant control pipe
Electric current be converted to sampled voltage.
9. LED drive device according to claim 1, it is characterised in that: the LED drive device further includes driving mould
Block, the drive module are connected with the voltage input module, the control module and the first switch tube, are suitable for driving
The first switch tube.
10. LED drive device according to claim 9, it is characterised in that: the LED drive device further includes that third supplies
Electric module is suitable for the drive module power supply.
11. LED drive device according to claim 1, it is characterised in that: the LED drive device further includes the port VCC
And filter capacitor；
The port VCC is connected with the voltage input module and the control module, is suitable for the control module power supply；
Described filter capacitor one end is connected with the port VCC, other end ground connection.
12. a kind of driving method of the LED drive device as described in any one of claims 1 to 11, which is characterized in that described
Driving method includes at least:
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 greater than or equal to the first setting voltage VH, the first switch
Pipe shutdown, only described second power supply unit are 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 conducting, first power supply module is that second power supply unit charges and is the load supplying.
13. the driving method of LED drive device according to claim 12, it is characterised in that: first power supply module
And during second power supply unit is the load supplying simultaneously, the voltage of first power supply module is less than the electricity
When pressing the output voltage and third setting voltage Vth of input module, the voltage input module is that first power supply module fills
Electricity, when the voltage of first power supply module reaches the third setting voltage Vth, the voltage input module stopping is described
The charging of first power supply module.
14. the driving method of LED drive device according to claim 13, it is characterised in that: first power supply module
Voltage be less than the voltage input module output voltage and third setting voltage Vth when, the voltage input module is institute
It charges while stating the charging of the first power supply module for second power supply unit, and is the load supplying.
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| CN201510469213.3A CN106658879B (en) | 2015-08-03 | 2015-08-03 | LED drive device and its driving method |
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| CN201510469213.3A CN106658879B (en) | 2015-08-03 | 2015-08-03 | LED drive device and its driving method |
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| CN106658879B true CN106658879B (en) | 2019-05-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011244677A (en) * | 2010-04-23 | 2011-12-01 | Rohm Co Ltd | Control circuit for switching power supply, and switching power supply, light-emitting device and electronic apparatus with the same |
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2015
- 2015-08-03 CN CN201510469213.3A patent/CN106658879B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN106658879A (en) | 2017-05-10 |
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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. |