CN208369916U - LED full voltage high-efficient linear driving circuit - Google Patents
LED full voltage high-efficient linear driving circuit Download PDFInfo
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- CN208369916U CN208369916U CN201821178117.9U CN201821178117U CN208369916U CN 208369916 U CN208369916 U CN 208369916U CN 201821178117 U CN201821178117 U CN 201821178117U CN 208369916 U CN208369916 U CN 208369916U
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Abstract
The utility model embodiment discloses a kind of LED full voltage high-efficient linear driving circuit, including LED load module and operating mode control module, LED load module includes the first load and the second load, first load and the second load are connected to the output end of external power supply, the output end of the first load and the second load is connected to by operating mode control module to be formed into a loop, to make the first load and second load normal work, and operating mode control module is additionally coupled between the input terminal of the second load and the output end of external power supply, it can control the on-off between the second load and external power supply, to the series-parallel connection type between the first load of control and the second load, realize the linear full voltage driving of LED light string；And the operating current of LED load module can also be adjusted according to the voltage of external power supply so that first load and second load operating current reduced with the raising of voltage, guarantee LED light string can efficient work, reduce other additional power consumptions.
Description
Technical field
The utility model embodiment is related to field of LED drive technology, especially a kind of LED full voltage high-efficient linear driving
Circuit.
Background technique
LED is a kind of semiconductor diode that electric energy can be converted to luminous energy, since LED is the semiconductor of characteristic sensitivity
Device, and there is negative temperature characteristic, thus need to carry out it steady-working state and protection in application process, such as with
When LED is as display or other lighting apparatus or backlight, need to drive LED.
In the prior art in typical LED linear constant current drive mode, the output power of lamps and lanterns is Pout=Uled×Iout,
Wherein UledIt is the voltage of lamp string, IoutIt is lamp string electric current, generalling use 120Vac cannot as the linear power supply of input voltage
Work is under the input environment of 220Vac, and otherwise driving chip can cause to damage because the power consumption of itself is excessive, final LED lamp
It can not normal use；And linear power supply of the 220Vac as input voltage is used, because LED lamp bead pressure drop is much larger than 120Vac line
Pulsating dc voltage after net rectification, causes to be unable to reach LED lamp bead pressure drop in 120Vac input range, LED lamp can not
It works normally.
Existing LED illumination Linear Driving requires to meet the high efficiency of client, is usually operated under single voltage, no
When being able to satisfy the full voltage job requirement of high-low voltage, and working under high-low voltage, and it will lead to the inconsistent problem of power.
Utility model content
The utility model embodiment is mainly solving the technical problems that provide a kind of LED full voltage high-efficient linear driving electricity
LED linear full voltage, high efficiency and the consistent driving function of high-low pressure power are realized in road.
In order to solve the above technical problems, the technical solution that the embodiment that the utility model is created uses is: providing one
Kind LED full voltage high-efficient linear driving circuit, comprising:
LED load module, including first load and second load, it is described first load and second load be equipped with it is several according to
Secondary concatenated LED lamp bead, the input terminal of first load and the input terminal of the second load are connected to the output of external power supply
End；
Operating mode control module is connected to the output end of first load and the output end of the second load to be formed back
Road, the operating mode control module are connect with the external power supply, and the operating mode control module be additionally coupled to it is described
On route between the input terminal of second load and the output end of the external power supply, for making first load and second negative
The operating current of series-parallel connection status and first load and the second load between load changes.
Optionally, when first load and the second load in parallel, the voltage of the external power supply is default less than first
Threshold value, the output power of the external power supply are P1；When first load and the second load in series, the external power supply
Voltage is greater than the second preset threshold, and the output power of the external power supply is P3；When first load and the second load are by simultaneously
Connection connection is transferred to series connection, and the voltage of the external power supply is greater than first preset threshold and is less than the described second default threshold
Value, the output power of the external power supply are P2；The difference of described P1, P2 and P3 between any two is less than predetermined power threshold value, institute
The first preset threshold is stated less than second preset threshold.
Optionally, further includes:
The input terminal of rectification module, the rectification module is connected to the output end of external power supply, is used for the external electricity
It is exported after the voltage signal rectification in source, the input terminal of first load and the input terminal of the second load are connected to the rectification
The output end of module.
Optionally, the operating mode control module includes:
Pipe unit is switched, the route being set between the input terminal of second load and the output end of the rectification module
On；
Mode controlling unit, including the first output end OUT1 and second output terminal OUT2, the first output end OUT1 company
It is connected to the grid of the first power tube M1, the source electrode ground connection of the first power tube M1, the drain electrode connection of the first power tube M1
To the output end of first load；The second output terminal OUT2 is connected to the grid of the second power tube M2, second function
The source electrode of rate pipe M2 is grounded, and the drain electrode of the second power tube M2 is connected to the output end of second load, and described second is negative
The diode D1 that the output end of load also passes through forward conduction is connected to the input terminal of first load；
Detecting signal unit is connect with the rectification module, switch pipe unit and mode controlling unit, described for detecting
First control signal and second control signal are exported after the voltage of rectification module output respectively to switch pipe unit and scheme control
Unit, so that the series-parallel connection status between first load and the second load changes and makes first load and second
The operating current of load changes, and the detecting signal unit also exports third control signal to mode controlling unit, for finely tuning
The operating current of first load and the second load.
Optionally, the detecting signal unit includes first resistor R1, second resistance R2, filter resistance Rs, filter capacitor
C, the first end of first comparator U1 and the second comparator U2, the first resistor R1 are connected to the output of the rectification module
End, the second end of the first resistor R1 are grounded by the second resistance R2, and the second end of the first resistor R1 is also connected with
To the first end of the filter resistance Rs, the anode that the second end of the filter resistance Rs is connected to the first comparator U1 is defeated
Enter end, the second end of the filter resistance Rs also passes through filter capacitor C and is grounded, and the negative input of the first comparator U1 connects
It is connected to internal threshold voltage signal end Vref1, the output end of the first comparator U1 is connected to En control terminal, the En control
End is connected to the switch pipe unit and exports the first control signal to the switch pipe unit；The first comparator U1
Output end be further connected to first switch device S1 and second switch device S2, the first switch device be connected to by reverser
The input terminal of S1 is connected to high voltage threshold end Vref2, and the output end of the first switch device S1 is connected to the output of third signal
Vref4 is held, the input terminal of the second switch device S2 is connected to low voltage threshold end Vref3, and the second switch device S2's is defeated
Outlet is connected to the third signal output end Vref4, and the third signal output end Vref4 is connected to the scheme control list
Member simultaneously exports the third control signal to the mode controlling unit；The second end of the first resistor R1 is additionally coupled to second
The electrode input end of comparator U2, the negative input of the second comparator U2 are connected to the output of the second comparator U2
End, the output end of the second comparator U2 are connected to second signal output end Ictrl, the second signal output end Ictrl
It is connected to the mode controlling unit and exports the second control signal to the mode controlling unit.
Optionally, the mode controlling unit include the first control block and the second control block, first control block it is defeated
Enter end and is connected to the third signal output end Vref4 and second signal output end Ictrl, the output end of first control block
It is connected to the first output end OUT1；The input terminal of second control block is connected to the third signal output end Vref4
With second signal output end Ictrl, the output end of second control block is connected to the second output terminal OUT2.
Optionally, first control block includes third comparator U3, the 4th comparator U4, the 5th comparator U5 and the 6th
Comparator U6, the electrode input end of the third comparator U3 are connected to the second signal output end Ictrl, the third ratio
Negative input compared with device U3 is connected to the output end of the 4th comparator U4 by 3rd resistor R3 and the 4th resistance R4, and described
The negative input of three comparator U3 is additionally coupled to the source electrode of the first metal-oxide-semiconductor Q1, and the grid of the first metal-oxide-semiconductor Q1 is connected to institute
The output end of third comparator U3 is stated, the drain electrode of the first metal-oxide-semiconductor Q1 is connected to internal source voltage Vdd；Described 4th compares
The electrode input end of device U4 is connected to the third signal output end Vref4, and the negative input of the 4th comparator U4 connects
It is connected on the route between the 3rd resistor R3 and the 4th resistance R4, the output end of the 4th comparator U4 is connected to described
The negative input of the electrode input end of 5th comparator U5, the 5th comparator U5 passes through the 5th resistance R5 and the 6th resistance
R6 ground connection, the negative input of the 5th comparator U5 are additionally coupled to the source electrode of the second metal-oxide-semiconductor Q2, the 5th comparator U5
Output end be connected to the grid of the second metal-oxide-semiconductor Q2, the drain electrode of the second metal-oxide-semiconductor Q2 is connected to the internal source voltage
Vdd；The electrode input end of the 6th comparator U6 is connected on the route between the 5th resistance R5 and the 6th resistance R6,
The enabled control terminal of the 6th comparator U6 is connected to the En control terminal for receiving the first control signal, and described the
The negative input of six comparator U6 is grounded by the 7th resistance R7, and the negative input of the 6th comparator U6 is additionally coupled to
The source electrode of first power tube M1, the output end of the 6th comparator U6 are connected to the first output end OUT1, and described first
Output end OUT1 is connected to the grid of the first power tube M1, and it is negative that the drain electrode of the first power tube M1 is connected to described first
The output end of load.
Optionally, the second control block compares including the 7th comparator U7, the 8th comparator U8, the 9th comparator U9 and the tenth
Device U10, the electrode input end of the 7th comparator U7 are connected to the second signal output end Ictrl, and the described 7th compares
The negative input of device U7 is connected to the output end of the 8th comparator U8 by the 8th resistance R8 and the 9th resistance R9, and the described 7th
The negative input of comparator U7 is additionally coupled to the source electrode of third metal-oxide-semiconductor Q3, and the grid of the third metal-oxide-semiconductor Q3 is connected to described
The drain electrode of the output end of 7th comparator U7, the third metal-oxide-semiconductor Q3 is connected to internal source voltage Vdd；8th comparator
The electrode input end of U8 is connected to the third signal output end Vref4, the negative input connection of the 8th comparator U8
To the route between the 8th resistance R8 and the 9th resistance R9, the output end of the 8th comparator U8 is connected to described the
The negative input of the electrode input end of nine comparator U9, the 9th comparator U9 passes through the electricity of the tenth resistance R10 and the 11st
R11 ground connection is hindered, the negative input of the 9th comparator U9 is additionally coupled to the source electrode of the 4th metal-oxide-semiconductor Q4, and the described 9th compares
The output end of device U9 is connected to the grid of the 4th metal-oxide-semiconductor Q4, and the drain electrode of the 4th metal-oxide-semiconductor Q4 is connected to the internal electricity
Potential source Vdd；The electrode input end of the tenth comparator U10 is connected between the tenth resistance R10 and eleventh resistor R11
Route on, the negative input of the tenth comparator U10 is grounded by twelfth resistor R12, the tenth comparator U10
Negative input be additionally coupled to the source electrode of the second power tube M2, the output end of the tenth comparator U10 is connected to described
Two output end OUT2, the second output terminal OUT2 are connected to the grid of the second power tube M2, the second power tube M2
Drain electrode be connected to it is described second load output end.
The beneficial effect of the utility model embodiment is: LED load module includes the first load and the second load, and first
Load and the second load are equipped with multiple concatenated LED lamp beads, wherein the first load and the second load are connected to external power supply
Output end, by operating mode control module be connected to the first load and second load output end to be formed into a loop, thus
The first load and second is set to load and work normally, and operating mode control module is additionally coupled to the input terminal of the second load and external
Between the output end of power supply, the on-off between the second load and external power supply can control, thus the first load of control and second
Series-parallel connection type between load realizes the linear full voltage driving of LED light string；And it can also be according to the electricity of external power supply
It presses to adjust the operating current of the first load and the second load, so that the operating current of the first load and the second load is with voltage
Raising and reduce, guarantee LED light string can efficient work, reduce other additional power consumptions.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, for those skilled in the art, without creative efforts, can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is the structural schematic diagram of the utility model LED full voltage high-efficient linear driving circuit embodiment；
Fig. 2 is the structural schematic diagram of another embodiment of the utility model LED full voltage high-efficient linear driving circuit；
Fig. 3 is the particular circuit configurations schematic diagram of the utility model embodiment；
Fig. 4 is the electrical block diagram of the utility model embodiment detecting signal unit；
Fig. 5 is the electrical block diagram of the first control block of the utility model embodiment；
Fig. 6 is the electrical block diagram of the second control block of the utility model embodiment；
Fig. 7 is V diagram after the electric current and rectification module by LED light string of the utility model embodiment；
Fig. 8 is the input power curve graph of the utility model embodiment.
Specific embodiment
For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed
Thin explanation.It should be noted that it can be directly in another element when element is expressed " being fixed on " another element
Upper or placed in the middle there may be one or more therebetween elements.When an element is expressed " connection " another element, it can
To be directly to another element or elements placed in the middle there may be one or more therebetween.This specification is used
Term "vertical", "horizontal", "left" and "right" and similar statement for illustrative purposes only.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of the technical staff in art field is identical.Art used in the description of the utility model in this specification
Language, which is only for the purpose of describing specific embodiments, is not intended to limitation the utility model.Term used in this specification
"and/or" includes any and all combinations of one or more related listed items.
Embodiment 1
Referring to Fig. 1, Fig. 1 is the utility model embodiment LED full voltage high-efficient linear driving circuit structure schematic diagram.
As shown in Figure 1, a kind of LED full voltage high-efficient linear driving circuit, comprising: LED load module 1 and operating mode
Control module 2.
LED load module 1 includes the first load led1 and the second load led2, the first load led1 and the second load led2
Several LED lamp beads being sequentially connected in series are equipped with, the input terminal that the input terminal of the first load led1 and second load led2 is all connected with
To the output end of external power supply；Operating mode control module 2 is connected to the output end and the second load led2 of the first load led1
Output end to be formed into a loop, operating mode control module 2 is connect with external power supply, and operating mode control module 2 is also connected with
On route between the output end of the input terminal and external power supply that load led2 to second, for making the first load led1 and second
The operating current for loading the series-parallel connection status between led2 and the first load led1 and the second load led2 changes.
External power supply be it is a kind of provide the device of electric energy for circuit, in one embodiment, referring to Fig. 2, Fig. 2 is this reality
With the structural schematic diagram of another embodiment of New LED full voltage high-efficient linear driving circuit, as shown in Fig. 2, this is practical new
Type LED full voltage high-efficient linear driving circuit further includes rectification module 3, and the input terminal of rectification module 3 is connected to external power supply
Output end, for output after rectifying the voltage signal of external power supply to the first load led1 and the second load led2, first
The input terminal of the input terminal and the second load led2 that load led1 is connected to the output end of rectification module 3, the second load led2
Output end also pass through the diode D1 of forward conduction and be connected to the input terminal of the first load led1.In one embodiment, outside
Alternating current can be used by connecing power supply, wherein after rectification module 3 connects utility grid, the ac voltage signal of network voltage is carried out
D. c. voltage signal is exported after rectification.Certainly, external power supply can also be using battery, solar battery or other electric energy dress
It sets, it is negative to reach driving LED that the output voltage of battery is adjusted by rectification module 3 or transformer common in the art
Carry module 1 work purpose, rectification module 3 can using half-wave rectifying circuit in the prior art, full-wave rectifying circuit or
Bridge rectifier etc..
LED load module 1 includes the first load led1 and the second load led2, wherein the first load led1 and second is negative
It carries led2 to be made of several LED lamp beads being sequentially connected in series respectively, the LED lamp bead being sequentially connected in series forms LED light string, wherein first
The input terminal of load led1 is the anode of first LED lamp bead in the LED light string for form the first load led1, the first load led1
Output end be form first load led1 LED light string in the last one LED lamp bead cathode；And the second load led2's is defeated
Enter end for the anode of the first LED lamp bead in the LED light string of the second load of composition led2, the output end of the second load led2 is composition
The cathode of the last one LED lamp bead in the LED light string of second load led2.It should be noted that in the specific implementation, this is practical
New LED full voltage high-efficient linear driving circuit is not limited to one LED load module 1 of setting, according to different applied fields
Scape, the LED load module 1 in circuit are also provided with multiple.
Operating mode control module 2 is connect with the output end of the first load led1, so that external power supply, the first load
Led1 and operating mode control module 2 are formed into a loop, or external power supply, rectification module 3, first is made to load led1 and work
Mode control module 2 is formed into a loop, and operating mode control module 2 is also connect with the output end of the second load led2, so that
External power supply, second load led2 and operating mode control module 2 be formed into a loop, or make external power supply, rectification module 3,
Second load led2 and operating mode control module 2 are formed into a loop；Operating mode control module 2 is connect with rectification module 3 to examine
The output voltage of rectification module 3 is surveyed, and operating mode control module 2 is additionally coupled to the input terminal and rectification mould of the second load led2
On route between the output end of block 3, to control the second load led2 according to the output voltage of the rectification module 3 detected
With the on-off between rectification module 3, rectification module 3 exports low-voltage and the first load led1 and second is then made to load led2 parallel connection
Connection, 3 output HIGH voltage of rectification module then make the first load led1 and second load led2 series connection, the first load of control
Series-parallel connection type between the load of led1 and second led2.
As the first load led1 and the second load led2 parallel connection, the voltage of external power supply is less than the first preset threshold, outside
The output power for connecing power supply is P1；As the first load led1 and the second load led2 series connection, the voltage of external power supply is greater than the
Two preset thresholds, the output power of external power supply are P3；When the first load led1 and the second load led2 are transferred to by being connected in parallel
It is connected in series, the voltage of external power supply is greater than the first preset threshold and less than the second preset threshold, the output power of external power supply
For P2；The difference of P1, P2 and P3 between any two is less than predetermined power threshold value, and the first preset threshold is less than the second preset threshold.The
One preset threshold, the second preset threshold and predetermined power threshold value are that system is pre-set, and the first preset threshold, second default
Threshold value and predetermined power threshold value can set different numerical value according to specific different application scenarios.
Implement when, by external power supply be utility grid for exporting 120Vac 220Vac network voltage, when outer
When to connect power supply be low-voltage output (i.e. 120Vac network voltage), operating mode control module 2 makes the first load led1 and the
Two load led2 are connected in parallel, and when the output voltage of external power supply is increased to default high-voltage value (i.e. 220Vac network voltage)
When, operating mode control module 2 makes the first load led1 and second load led2 series connection, realizes the driving side of full voltage
Formula.In addition, either in low pressure parallel connection, or in high-pressure series state, the output electric current of operating mode control module 2 is equal
It can be changed according to the voltage change of alternating current, when voltage rises, the output current reduction of LED light string.By reducing LED light string
Electric current, that is, reduce by first load led1 and second load led2 operating current, avoid driving port power consumption increase, thus
Whole transfer efficiency is improved, ensure that high-low pressure LED driving power is consistent according to preset threshold value, realizes full voltage work
Make, high efficiency is converted and the consistent function of high-low pressure power.
The present embodiment includes the first load led1 and the second load led2 by LED load module 1, and first loads led1
Multiple concatenated LED lamp beads are equipped with the second load led2, wherein the first load led1 and the second load led2 are connected to
The output end of external power supply is connected to the output of the load of the first load led1 and second led2 by operating mode control module 2
End is worked normally with being formed into a loop so that the first load led1 and second be made to load led2, and operating mode control module 2 also connects
It is connected between the input terminal of the second load led2 and the output end of external power supply, can control the second load led2 and external power supply
Between on-off, thus control first load led1 and second load led2 between series-parallel connection type, realize LED light string
Linear full voltage driving；And it can also adjust the load of the first load led1 and second led2's according to the voltage of external power supply
Operating current guarantees LED so that the operating current of the first load led1 and the second load led2 are reduced with the raising of voltage
Lamp string being capable of efficient work.
In one alternate embodiment, referring to Fig. 3, Fig. 3 is the utility model LED full voltage high-efficient linear driving electricity
The particular circuit configurations schematic diagram on road.
As shown in figure 3, operating mode control module 2 includes switch pipe unit 21, mode controlling unit 22 and signal detection
Unit 23.
Switch pipe unit 21 is set to the route between the input terminal of the second load led2 and the output end of rectification module 3
On；Switch pipe unit 21 can be using in the prior art for making open circuit, making current interruptions or it being made to flow to other circuits
Electronic component, such as switching tube etc..Switch pipe unit 21 is set to the input terminal and rectification module 3 of the second load led2
Between output end, to realize the function of changing the on-off between the second load led2 and rectification module 3.
Mode controlling unit 22 includes the first output end OUT1 and second output terminal OUT2, and the first output end OUT1 is connected to
The grid of first power tube M1, the source electrode ground connection of the first power tube M1, the drain electrode of the first power tube M1 are connected to first end V1, the
One end V1 is connected to the output end of the first load led1；Second output terminal OUT2 is connected to the grid of the second power tube M2, and second
The source electrode of power tube M2 is grounded, and the drain electrode of the second power tube M2 is connected to second end V2, and second end V2 is connected to the second load
The output end of led2, the diode D1 that the output end of the second load led2 also passes through forward conduction are connected to the first load led1's
Input terminal；The output end of second load led2 is connected to the anode of diode D1, and the cathode of diode D1 is connected to the first load
The input terminal of led1.First power tube M1 and the second power tube M2 can use field-effect tube or triode.
Detecting signal unit 23 is connect with rectification module 3, switch pipe unit 21 and mode controlling unit 22, whole for detecting
First control signal and second control signal are exported after the voltage that flow module 3 exports respectively to switch pipe unit 21 and scheme control
Unit 22, so that the series-parallel connection status between the first load led1 and the second load led2 changes and makes the first load led1
Change with the operating current of the second load led2, in addition detecting signal unit 23 is defeated after the rectification of sorting module 3 by detection
Voltage out, output third control signal to mode controlling unit, for finely tuning the work of first load and the second load
Electric current.
Mode controlling unit 22 loads the series-parallel connection type between led2 for changing the first load led1 and second,
Mode controlling unit 22 is also used to change the operating current of the load of the first load led1 and second led2, wherein scheme control list
Member 22 includes that the first output end OUT1 and second output terminal OUT2, the first output end OUT1 are connected to the grid of the first power tube M1
Pole, second output terminal OUT2 are connected to the grid of the second power tube M2, when detecting signal unit 23 detects that rectification module 3 exports
When low-voltage, output first control signal to switch pipe unit 21 is connected so as to switch pipe unit 21, and the first control of output
Signal and output second control signal are to mode controlling unit 22 so that the first power tube M1 and the second power tube M2 is connected, at this time
First load led1 and the second load led2 are in and are connected in parallel state, while exporting third and controlling signal to mode working cell
22 so that mode controlling unit 22 adjust first load led1 and second load led2 operating current make the first load led1 and
Second load led2 enters normal operating conditions；
When detecting signal unit 23 detects 3 output HIGH voltage of rectification module, output first control signal to switching tube
Unit 21 is so that switch pipe unit 21 ends, and exports first control signal and second control signal to mode controlling unit 22
To close the first power tube M1 and the second power tube M2 is connected, at this point, the second load led2 passes through the load of diode D1 and first
Led1 series connection, realizes full voltage driving method.On the other hand, either in low pressure paralleling model still in high-pressure series mode
Under, mode controlling unit 22 controls the electric current of the first load led1 of signal control and the second load led2 according to third.Avoid by
It is fixed in the voltage of LED light string, so that the raising of voltage causes the voltage for driving port to increase, the power consumption on driving port
It will will increase, waste of energy, therefore reduce the operating current of LED light string at this time, so that it may accordingly decrease the function of driving port
Consumption, improves whole transfer efficiency, while can also make system power of system in high-low pressure by preset threshold value
Difference is less than preset power threshold, realizes high efficiency conversion and the consistent function of high-low pressure power.It should be pointed out that above-mentioned
High voltage and low-voltage are set by systemic presupposition, such as when the utility model LED full voltage high-efficient linear driving circuit
When being connected to utility grid, the voltage of utility grid is divided into 120Vac and two kinds of 220Vac, and wherein 120Vac network voltage is
Low-voltage and 220Vac network voltage are high voltage.Certainly, high voltage and low-voltage are not limited to above-mentioned utility grid voltage, root
According to the difference with application scenarios, the voltage value of high voltage and bottom voltage may be arranged as different voltage values.
In one embodiment, referring to Fig. 4, Fig. 4 is the signal inspection of the utility model LED linear full voltage driving circuit
Survey the electrical block diagram of unit.
As shown in figure 4, detecting signal unit 23 includes first resistor R1, second resistance R2, filter resistance Rs, filter capacitor
C, first comparator U1 and the second comparator U2, the first end of first resistor R1 are connected to the output end of rectification module 3, the first electricity
The second end of resistance R1 is grounded by second resistance R2, and the second end of first resistor R1 is additionally coupled to the first end of filter resistance Rs,
The second end of filter resistance Rs is connected to the electrode input end of first comparator U1, and the second end of filter resistance Rs also passes through filtering
Capacitor C ground connection, the negative input of first comparator U1 are connected to internal threshold voltage signal end Vref1, first comparator U1
Output end be connected to En control terminal, En control terminal is connected to switch pipe unit 21 and mode controlling unit 22 and exports the first control
Signal processed extremely switch pipe unit 21 and mode controlling unit 22；The output end of first comparator U1 is further connected to first switch
Device S1 and second switch device S2 is connected to by reverser, the input terminal of first switch device S1 is connected to high voltage threshold end
Vref2, the output end of first switch device S1 are connected to third signal output end Vref4, the input terminal connection of second switch device S2
To low voltage threshold end Vref3, the output end of second switch device S2 is connected to third signal output end Vref4, and third signal is defeated
Outlet Vref4, which is connected to mode controlling unit 22 and exports third, controls signal to mode controlling unit 22；First resistor R1's
Second end is additionally coupled to the electrode input end of the second comparator U2, and the negative input of the second comparator U2 is connected to second and compares
The output end of device U2, the output end of the second comparator U2 are connected to second signal output end Ictrl, second signal output end
Ictrl is connected to mode controlling unit 22 and exports second control signal to mode controlling unit 22.
First resistor R1, second resistance R2, filter resistance Rs, filter capacitor C and first comparator U1 constitute high-low pressure
The comparison circuit for inputting judgement, for exporting first control signal and third control signal, filter resistance Rs and filter capacitor C master
If the sampled signal filter rectification that first resistor R1 and second resistance R2 are divided, obtains the virtual value of input voltage,
The virtual value is used to judge the foundation of high-low pressure input judgement；And first resistor R1, second resistance R2 and the second comparator U2 group
Circuit is followed at for export second control signal；Wherein internal threshold voltage signal end Vref1 connects internal threshold voltage,
When the first end of first resistor R1 is connected to the output end of external power supply, the output voltage of external power supply by first resistor R1 and
Second resistance R2 is divided, and is compared with internal threshold voltage, is then considered that high voltage is defeated more than internal threshold voltage
Enter, En control terminal is high level at this time, and if lower than low-voltage input is considered if internal threshold voltage, En control terminal is low at this time
Level, the threshold value when voltage of high voltage threshold end Vref2 is high input voltage, the voltage of low voltage threshold end Vref3 are low
Threshold value when input voltage, when En control terminal is high level, first switch device S1 is connected and second switch device S2 ends, third
Signal output end Vref4 is equal to Vref2；When En control terminal is low level, first switch device S1 ends and second switch device S2
Conducting, third signal output end Vref4 are equal to Vref3.Third signal output end Vref4 is connected to mode controlling unit 22 and defeated
Third controls signal to mode controlling unit 22, for finely tuning the electric current of LED light string out.
Pass through the first control of En control terminal output after detecting signal unit 23 detects that the voltage of rectification module 3 is low-voltage
For signal processed to switch pipe unit 21, first control signal is low voltage signal at this time, is closed and is connected with driving switch pipe unit 21
Rectification module 3 and the second load led2, and second control signal is exported to scheme control list by second signal output end Ictrl
Member 22, with the first end V1 of drive mode control unit 22 and second end V2 distinguish output current signal to the first load led1 and
Second load led2, so that the first load led1 and the second load led2 are connected in parallel；When detecting signal unit 23 detects
Voltage to rectification module 3 extremely switchs pipe unit 21 and mode control to export first control signal by En control terminal after high voltage
Molding block 22, first control signal is high voltage signal at this time, with the cut-off of driving switch pipe unit 21, disconnects 3 He of rectification module
Connection between second load led2, and second control signal is exported to scheme control list by second signal output end Ictrl
Member 22, is connected the second power tube M2 and the first power tube M1 ends.At this point, the output end of the first load led1 passes through diode
D1 is conducted to the input terminal of the first load led1, so that the first load led1 and the second load led2 are connected in series.With whole
For flow module 3 connects utility grid, network voltage includes 120Vac input voltage and 220Vac input voltage, wherein
120Vac input voltage is voltage, and 220Vac input voltage is high voltage, certainly, the voltage of above-mentioned high voltage and low-voltage according to
Different numberical ranges can be set in difference with application scenarios.
In one embodiment, mode controlling unit 22 includes the first control block and the second control block, first control
The input terminal of block is connected to third signal output end Vref4 and second signal output end Ictrl, and the output end of the first control block connects
It is connected to the first output end OUT1；The input terminal of second control block is connected to third signal output end Vref4 and second signal output
Ictrl is held, the output end of the second control block is connected to second output terminal OUT2.
Referring to Fig. 5, Fig. 5 is the tool of the first control block of the utility model LED full voltage high-efficient linear driving circuit
Body electrical block diagram.
As shown in figure 5, the first control block includes third comparator U3, the 4th comparator U4, the 5th comparator U5 and the 6th
Comparator U6, the electrode input end of third comparator U3 are connected to second signal output end Ictrl, the cathode of third comparator U3
Input terminal is connected to the output end of the 4th comparator U4, the cathode of third comparator U3 by 3rd resistor R3 and the 4th resistance R4
Input terminal is additionally coupled to the source electrode of the first metal-oxide-semiconductor Q1, and the grid of the first metal-oxide-semiconductor Q1 is connected to the output end of third comparator U3,
The drain electrode of first metal-oxide-semiconductor Q1 is connected to internal source voltage Vdd；It is defeated that the electrode input end of 4th comparator U4 is connected to third signal
Outlet Vref4, the negative input of the 4th comparator U4 are connected on the route between 3rd resistor R3 and the 4th resistance R4, the
The output end of four comparator U4 is connected to the electrode input end of the 5th comparator U5, and the negative input of the 5th comparator U5 passes through
5th resistance R5 and the 6th resistance R6 ground connection, the negative input of the 5th comparator U5 are additionally coupled to the source electrode of the second metal-oxide-semiconductor Q2,
The output end of 5th comparator U5 is connected to the grid of the second metal-oxide-semiconductor Q2, and the drain electrode of the second metal-oxide-semiconductor Q2 is connected to internal source voltage
Vdd；The electrode input end of 6th comparator U6 is connected on the route between the 5th resistance R5 and the 6th resistance R6, and the 6th compares
The enabled control terminal of device U6 is connected to En control terminal for receiving first control signal, and the negative input of the 6th comparator U6 is logical
The 7th resistance R7 ground connection is crossed, the negative input of the 6th comparator U6 is additionally coupled to the source electrode of the first power tube M1, and the 6th compares
The output end of device U6 is connected to the first output end OUT1, and the first output end OUT1 is connected to the grid of the first power tube M1, and first
The drain electrode of power tube M1 is connected to first end V1, and first end V1 is connected to the output end of the first load led1.
In one alternate embodiment, referring to Fig. 6, Fig. 6 is the utility model LED full voltage high-efficient linear driving electricity
The particular circuit configurations schematic diagram of second control block on road.
As shown in fig. 6, the second control block includes the 7th comparator U7, the 8th comparator U8, the 9th comparator U9 and the tenth
Comparator U10, the electrode input end of the 7th comparator U7 are connected to second signal output end Ictrl, and the 7th comparator U7's is negative
Pole input terminal is connected to the output end of the 8th comparator U8 by the 8th resistance R8 and the 9th resistance R9, and the 7th comparator U7's is negative
Pole input terminal is additionally coupled to the source electrode of third metal-oxide-semiconductor Q3, and the grid of third metal-oxide-semiconductor Q3 is connected to the output of the 7th comparator U7
End, the drain electrode of third metal-oxide-semiconductor Q3 are connected to internal source voltage Vdd；The electrode input end of 8th comparator U8 is connected to third letter
Number output end Vref4, the negative input of the 8th comparator U8 are connected to the route between the 8th resistance R8 and the 9th resistance R9
On, the output end of the 8th comparator U8 is connected to the electrode input end of the 9th comparator U9, the cathode input of the 9th comparator U9
End is grounded by the tenth resistance R10 and eleventh resistor R11, and the negative input of the 9th comparator U9 is additionally coupled to the 4th MOS
The source electrode of pipe Q4, the output end of the 9th comparator U9 are connected to the grid of the 4th metal-oxide-semiconductor Q4, the drain electrode connection of the 4th metal-oxide-semiconductor Q4
To internal source voltage Vdd；The electrode input end of tenth comparator U10 is connected between the tenth resistance R10 and eleventh resistor R11
Route on, the negative input of the tenth comparator U10 is grounded by twelfth resistor R12, and the cathode of the tenth comparator U10 is defeated
Entering end and is additionally coupled to the source electrode of the second power tube M2, the output end of the tenth comparator U10 is connected to second output terminal OUT2, and second
Output end OUT2 is connected to the grid of the second power tube M2, and the drain electrode of the second power tube M2 is connected to second end V2, second end V2
It is connected to the output end of the second load led2.
As shown in fig. 7, Fig. 7 is passed through in the utility model LED full voltage high-efficient linear driving circuit one embodiment
V diagram after the electric current and rectification module of LED light string, either low pressure paralleling model, or in high-pressure series mode, lead to
Cross the voltage change that the electric current of LED light string can be rectified according to rectification module 3.When the voltage increases, subtracted by the electric current of LED light string
It is small, that is, reduced by the electric current of inside the first power tube M1 or/and the second power tube M2, consumption is in internal metal-oxide-semiconductor in this way
Lower power consumption, improve whole transfer efficiency.Second signal output end Ictrl output second control signal Ictrl be
The voltage after rectification is followed, while being also the first control block of control and the second control block, realizes control LED light string electric current.The
Three control signal Vref4 are used to finely tune the electric current of LED light string, realize that high-low pressure power is consistent.
Referring to Fig. 8, Fig. 8 is input of the utility model LED full voltage high-efficient linear driving circuit under full voltage
Power graph.
As shown in figure 8, output power of the utility model under full voltage includes tri- sections of T1, T2 and T3, wherein external electricity
The output voltage in source includes U1, U2, U3 and U4, and U1 to U2 is the first operating voltage section, and corresponding T1 is low pressure input area；U2
It is the second operating voltage section to U3, corresponding T2 is middle transition region；U3 to U4 is third operating voltage section, and corresponding T3 is
High input voltage region.The output power in the region T1 and T3 is almost the same, and the region T2 is had due to the characteristic output power of circuit
Decline, so that it is consistent to have reached full voltage output power.
Specifically, when external power supply exports low-voltage, such as the input terminal of rectification module 3 connects utility grid
When 120Vac voltage, circuit is in the first operating voltage section, and detecting signal unit 23 detects the low electricity that rectification module 3 exports
Then pressure exports first control signal extremely switch pipe unit 21 and mode control module 22, and exports second control signal to mould
Formula control module 22, switch pipe unit 21 are connected, and En control terminal is low-voltage at this time, so that the 6th comparator U6 is effective, conducting
First power tube M1, the second power tube M2 is normally open, and the first output end OUT1 and second in mode controlling unit 22 is defeated
Outlet OUT2 is connected with the first load led1 and the second load led2 respectively, and the first load led1 and the second load led2 parallel connection connect
It connects, detecting signal unit 23 also exports third and controls signal to mode controlling unit 22, so that control passes through the first load led1
With the electric current of the second load led2, worked normally with the first load led1 of driving and the second load led2, the first load at this time
The input power for the LED light string that the load of led1 and second led2 is composed in parallel is P1, and the operating current of the first load led1 is I1,
The operating current of second load led2 is I2, and the size of current of I1=I2, I1 and I2 are set by mode controlling unit 22, the
One operating voltage section input power is up to P4, the minimum P5 of input power.
When external power supply output high voltage when, such as rectification module 3 input terminal connection utility grid 220Vac electricity
When pressure, circuit is in third operating voltage section, and detecting signal unit 23 detects the high voltage that rectification module 3 exports, then
First control signal extremely switch pipe unit 21 and mode control module 22 are exported, and exports second control signal to scheme control mould
Block 22, at this time En control terminal be high voltage, switch pipe unit 21 end, and make the 6th comparator U6 be it is invalid, the 6th compares
Device U6 output is closed, to control the first power tube M1 cut-off, and since the second power tube M2 is normally open, mode controlling unit
The load led1 cut-off of the first output end OUT1 and first in 22, and second output terminal OUT2 is connected with the second load led2, the
One load led1 is connected in series by the load of diode D1 and second led2, and detecting signal unit 23 also exports second control signal
To mode controlling unit 22, export to reduce second output terminal OUT2 to the series connection of the first load led1 and the second load led2
The electric current of the lamp string of composition, in third operating voltage section, input power is up to P4, the minimum P5 of input power.
It should be noted that giving the preferable implementation of the utility model in the specification and its attached drawing of the utility model
Example, still, the utility model can be realized by many different forms, however it is not limited to which this specification is described to be implemented
Example, not as the additional limitation to the content of the present invention, purpose of providing these embodiments is makes to this reality these embodiments
Understanding with novel disclosure is more thorough and comprehensive.Also, above-mentioned each technical characteristic continues to be combined with each other, and is formed not upper
The various embodiments that face is enumerated are accordingly to be regarded as the range of the utility model specification record；Further, to ordinary skill
For personnel, it can be modified or changed according to the above description, and all to should belong to this practical new for all these modifications and variations
The protection scope of type appended claims.
Claims (8)
1. a kind of LED full voltage high-efficient linear driving circuit characterized by comprising
LED load module, including the first load and the second load, first load and the second load are equipped with and several successively go here and there
The LED lamp bead of connection, the input terminal of first load and the input terminal of the second load are connected to the output end of external power supply；
Operating mode control module, be connected to it is described first load output end and second load output end to be formed into a loop,
The operating mode control module is connect with the external power supply, and the operating mode control module is additionally coupled to described second
On route between the input terminal of load and the output end of the external power supply, for making first load and the second load
Between series-parallel connection status and it is described first load and second load operating current change.
2. LED full voltage high-efficient linear driving circuit according to claim 1, it is characterised in that: when described first negative
When carrying in parallel with the second load, the voltage of the external power supply is less than the first preset threshold, the output power of the external power supply
For P1；When first load and the second load in series, the voltage of the external power supply is greater than the second preset threshold, described outer
The output power for connecing power supply is P3；It is transferred to series connection by being connected in parallel when first load is loaded with second, it is described external
The voltage of power supply is greater than first preset threshold and is less than second preset threshold, and the output power of the external power supply is
P2；The difference of described P1, P2 and P3 between any two is less than predetermined power threshold value, and it is pre- that first preset threshold is less than described second
If threshold value.
3. LED full voltage high-efficient linear driving circuit according to claim 1, which is characterized in that further include:
The input terminal of rectification module, the rectification module is connected to the output end of external power supply, for by the external power supply
It is exported after voltage signal rectification, the input terminal of first load and the input terminal of the second load are connected to the rectification module
Output end.
4. LED full voltage high-efficient linear driving circuit according to claim 3, which is characterized in that the operating mode
Control module includes:
Pipe unit is switched, is set on the route between the input terminal of second load and the output end of the rectification module；
Mode controlling unit, including the first output end OUT1 and second output terminal OUT2, the first output end OUT1 are connected to
The grid of first power tube M1, the source electrode ground connection of the first power tube M1, the drain electrode of the first power tube M1 are connected to institute
State the output end of the first load；The second output terminal OUT2 is connected to the grid of the second power tube M2, second power tube
The source electrode of M2 is grounded, and the drain electrode of the second power tube M2 is connected to the output end of second load, second load
The diode D1 that output end also passes through forward conduction is connected to the input terminal of first load；
Detecting signal unit is connect, for detecting the rectification with the rectification module, switch pipe unit and mode controlling unit
First control signal and second control signal extremely switch pipe unit and mode controlling unit are exported after the voltage of module output respectively,
So that the series-parallel connection status between first load and the second load changes and makes first load and the second load
Operating current change, the detecting signal unit also export third control signal to the mode controlling unit, for finely tuning
The operating current of first load and the second load.
5. LED full voltage high-efficient linear driving circuit according to claim 4, which is characterized in that the signal detection
Unit includes first resistor R1, second resistance R2, filter resistance Rs, filter capacitor C, first comparator U1 and the second comparator
The first end of U2, the first resistor R1 are connected to the output end of the rectification module, and the second end of the first resistor R1 is logical
The second resistance R2 ground connection is crossed, the second end of the first resistor R1 is additionally coupled to the first end of the filter resistance Rs, institute
The second end for stating filter resistance Rs is connected to the electrode input end of the first comparator U1, the second end of the filter resistance Rs
It is also grounded by filter capacitor C, the negative input of the first comparator U1 is connected to internal threshold voltage signal end
Vref1, the output end of the first comparator U1 are connected to En control terminal, and the En control terminal is connected to the switch pipe unit
And the first control signal is exported to the switch pipe unit；The output end of the first comparator U1 is further connected to
One derailing switch S1 and second switch device S2 is connected to by reverser, the input terminal of the first switch device S1 is connected to high voltage
Threshold value end Vref2, the output end of the first switch device S1 are connected to third signal output end Vref4, the second switch device
The input terminal of S2 is connected to low voltage threshold end Vref3, and the output end of the second switch device S2 is connected to the third signal
Output end Vref4, the third signal output end Vref4, which are connected to the mode controlling unit and export the third control, to be believed
Number to the mode controlling unit；The second end of the first resistor R1 is additionally coupled to the electrode input end of the second comparator U2,
The negative input of the second comparator U2 is connected to the output end of the second comparator U2, the second comparator U2's
Output end is connected to second signal output end Ictrl, and the second signal output end Ictrl is connected to the mode controlling unit
And the second control signal is exported to the mode controlling unit.
6. LED full voltage high-efficient linear driving circuit according to claim 5, which is characterized in that the scheme control
Unit includes the first control block and the second control block, and the input terminal of first control block is connected to the third signal output end
Vref4 and second signal output end Ictrl, the output end of first control block are connected to the first output end OUT1；Institute
The input terminal for stating the second control block is connected to the third signal output end Vref4 and second signal output end Ictrl, and described
The output end of two control blocks is connected to the second output terminal OUT2.
7. LED full voltage high-efficient linear driving circuit according to claim 6, which is characterized in that first control
Block includes third comparator U3, the 4th comparator U4, the 5th comparator U5 and the 6th comparator U6, the third comparator U3's
Electrode input end is connected to the second signal output end Ictrl, and the negative input of the third comparator U3 passes through third
Resistance R3 and the 4th resistance R4 is connected to the output end of the 4th comparator U4, and the negative input of the third comparator U3 also connects
It is connected to the source electrode of the first metal-oxide-semiconductor Q1, the grid of the first metal-oxide-semiconductor Q1 is connected to the output end of the third comparator U3, institute
The drain electrode for stating the first metal-oxide-semiconductor Q1 is connected to internal source voltage Vdd；The electrode input end of the 4th comparator U4 is connected to described
Third signal output end Vref4, the negative input of the 4th comparator U4 are connected to the electricity of the 3rd resistor R3 and the 4th
It hindering on the route between R4, the output end of the 4th comparator U4 is connected to the electrode input end of the 5th comparator U5,
The negative input of the 5th comparator U5 is grounded by the 5th resistance R5 and the 6th resistance R6, the 5th comparator U5's
Negative input is additionally coupled to the source electrode of the second metal-oxide-semiconductor Q2, and the output end of the 5th comparator U5 is connected to the 2nd MOS
The drain electrode of the grid of pipe Q2, the second metal-oxide-semiconductor Q2 is connected to the internal source voltage Vdd；The 6th comparator U6 is just
Pole input terminal is connected on the route between the 5th resistance R5 and the 6th resistance R6, the enabled control of the 6th comparator U6
End processed is connected to the En control terminal for receiving the first control signal, and the negative input of the 6th comparator U6 is logical
The 7th resistance R7 ground connection is crossed, the negative input of the 6th comparator U6 is additionally coupled to the source electrode of the first power tube M1, described
The output end of 6th comparator U6 is connected to the first output end OUT1, and the first output end OUT1 is connected to described first
The grid of power tube M1, the drain electrode of the first power tube M1 are connected to the output end of first load.
8. LED full voltage high-efficient linear driving circuit according to claim 6, which is characterized in that the second control block packet
The 7th comparator U7, the 8th comparator U8, the 9th comparator U9 and the tenth comparator U10 are included, the 7th comparator U7 is just
Pole input terminal is connected to the second signal output end Ictrl, and the negative input of the 7th comparator U7 passes through the 8th electricity
Resistance R8 and the 9th resistance R9 is connected to the output end of the 8th comparator U8, and the negative input of the 7th comparator U7 is also connected with
To the source electrode of third metal-oxide-semiconductor Q3, the grid of the third metal-oxide-semiconductor Q3 is connected to the output end of the 7th comparator U7, described
The drain electrode of third metal-oxide-semiconductor Q3 is connected to internal source voltage Vdd；The electrode input end of the 8th comparator U8 is connected to described
Three signal output end Vref4, the negative input of the 8th comparator U8 are connected to the 8th resistance R8 and the 9th resistance
On route between R9, the output end of the 8th comparator U8 is connected to the electrode input end of the 9th comparator U9, institute
The negative input for stating the 9th comparator U9 is grounded by the tenth resistance R10 and eleventh resistor R11, the 9th comparator U9
Negative input be additionally coupled to the source electrode of the 4th metal-oxide-semiconductor Q4, the output end of the 9th comparator U9 is connected to the described 4th
The drain electrode of the grid of metal-oxide-semiconductor Q4, the 4th metal-oxide-semiconductor Q4 is connected to the internal source voltage Vdd；The tenth comparator U10
Electrode input end be connected on the route between the tenth resistance R10 and eleventh resistor R11, the tenth comparator
The negative input of U10 is grounded by twelfth resistor R12, and the negative input of the tenth comparator U10 is additionally coupled to
The source electrode of two power tube M2, the output end of the tenth comparator U10 are connected to the second output terminal OUT2, and described second is defeated
Outlet OUT2 is connected to the grid of the second power tube M2, and the drain electrode of the second power tube M2 is connected to second load
Output end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821178117.9U CN208369916U (en) | 2018-07-23 | 2018-07-23 | LED full voltage high-efficient linear driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821178117.9U CN208369916U (en) | 2018-07-23 | 2018-07-23 | LED full voltage high-efficient linear driving circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108770132A (en) * | 2018-07-23 | 2018-11-06 | 深圳市明微电子股份有限公司 | LED full voltage high-efficient linear driving circuits |
| WO2020151101A1 (en) * | 2019-01-21 | 2020-07-30 | 苏州菲达旭微电子有限公司 | Dual voltage linear led load matching circuit |
| CN111640400A (en) * | 2020-06-11 | 2020-09-08 | 武汉华星光电技术有限公司 | Drive circuit, backlight module and display device |
-
2018
- 2018-07-23 CN CN201821178117.9U patent/CN208369916U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108770132A (en) * | 2018-07-23 | 2018-11-06 | 深圳市明微电子股份有限公司 | LED full voltage high-efficient linear driving circuits |
| CN108770132B (en) * | 2018-07-23 | 2023-11-03 | 深圳市明微电子股份有限公司 | LED full-voltage high-efficiency linear driving circuit |
| WO2020151101A1 (en) * | 2019-01-21 | 2020-07-30 | 苏州菲达旭微电子有限公司 | Dual voltage linear led load matching circuit |
| CN111640400A (en) * | 2020-06-11 | 2020-09-08 | 武汉华星光电技术有限公司 | Drive circuit, backlight module and display device |
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