CN107801274A - A kind of constant power output LED drive power and its constant power output method - Google Patents
A kind of constant power output LED drive power and its constant power output method Download PDFInfo
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- CN107801274A CN107801274A CN201711106571.3A CN201711106571A CN107801274A CN 107801274 A CN107801274 A CN 107801274A CN 201711106571 A CN201711106571 A CN 201711106571A CN 107801274 A CN107801274 A CN 107801274A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a kind of constant power output LED drive power and its constant power output method, the constant power output LED drive power includes output voltage adjusting module, output current regulation module and control chip, and the control chip connects the output voltage adjusting module and output current regulation module simultaneously.The present invention calculates real-time power output by control chip, and when real-time power output and goal-selling power output are inconsistent, output voltage adjusting module and output current regulation module is controlled to carry out voltage and/or electric current adjustment using control chip, so as to realize constant power output, over-voltage and over-current overshoot voltage when avoiding the LED light source from being started shooting impacts, ensure the life-span of LED light source, so as to ensure the reliability of illumination, and be advantageous to the standardization of product, facilitate the selection of user, while also save cost.
Description
Technical field
The present invention relates to field of LED drive, more particularly to a kind of constant power output LED drive power and its constant power output
Method.
Background technology
For existing LED drive power based on constant-current source, this is due to that LED C-V characteristic determines, is advantageous to LED light
Source steady operation.Because LED light source does not standardize, different forward voltage drop values（VF values）, different forward current values（IF values）'s
LED light source combination is complete, multifarious so as to the LED power of corresponding demand, and this just gives the design of LED drive power
Very big puzzlement is brought, in view of this, the constant-current source for exporting Width funtion arises at the historic moment, such as, output current 350mA, output electricity
10V-36V is pressed, this power supply there are following characteristics：
1）Output power range is very wide；
2）Input power range is very wide；
3）The moment of energization has excessive voltage and current and of short duration rush of current is had to light source, influences light source life.
The requirement of user is met to a certain extent, has also taken some problems out of, because input power range is very wide, design
All design margins are required to design by maximum during power supply, and the component selection of product, the contour structures selection of product are all
It is unexceptional, then cause significant wastage, or product can not install greatly very much in most application scenarios.
Thus prior art could be improved and improve.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of constant power output LED drivings
Power supply and its constant power output method, it is ensured that power output it is constant, so as to save cost.
In order to achieve the above object, this invention takes following technical scheme：
A kind of constant power output LED drive power, including：
Output voltage adjusting module, for feeding back first voltage sampled signal to control chip and adjusting the reality of LED drive power
When output voltage；
Output current regulation module, for feeding back second voltage sampled signal to control chip and adjusting the reality of LED drive power
When output current；
Control chip, for receiving first voltage sampled signal and second voltage sampled signal and the reality for calculating LED drive power
When power output, when real-time power output is less than the default target output of control chip, control output voltage adjustment mould
Block carries out voltage adjustment and/or control output current regulation module carries out electric current adjustment, so that the LED drive power is real-time
Power output reaches default target output；
The control chip connects the output voltage adjusting module and output current regulation module simultaneously.
In described constant power output LED drive power, the control chip includes：
Voltage computation unit, for calculating the real-time output voltage of LED drive power according to first voltage sampled signal；
Current calculation unit, the real-time output current of LED drive power is calculated for receiving second voltage sampled signal；
Power calculation unit, for calculating the real-time defeated of LED drive power according to real-time output voltage and real-time output current
Go out power；
Power adjustment unit, for by real-time power output compared with the default power output of control chip, and real-time
When power output is less than default target output, control output voltage adjusting module carries out voltage adjustment and/or control is defeated
Go out current adjusting module and carry out electric current adjustment, so as to reach default target defeated for the real-time power output of the LED drive power
Go out power.
In described constant power output LED drive power, the control chip is additionally operable to be more than control in real-time output voltage
During the default maximum output voltage of coremaking piece, or it is more than the default maximum output current of control chip in real-time output current
When, or it is more than the default peak power output of control chip or the default current output work of control chip in real-time power output
During rate, output abnormality shutdown signal.
In described constant power output LED drive power, the output voltage adjusting module includes first resistor, the second electricity
Resistance, 3rd resistor, the first metal-oxide-semiconductor and first comparator, the secondary anode of one end connection driving power of the first resistor,
Other end connection one end of second resistance of the first resistor, one end of 3rd resistor, the inverting input of first comparator
With the 7th pin of control chip, the other end connection current adjusting module of the second resistance and the source electrode of the first metal-oxide-semiconductor are described
3rd pin of the grid connection control chip of the first metal-oxide-semiconductor, the other end of the drain electrode connection 3rd resistor of first metal-oxide-semiconductor, institute
The in-phase input end for stating first comparator inputs the first reference voltage, and the output end of the first comparator feeds back to driving power
Primary, the output of control circuit.
In described constant power output LED drive power, the output current regulation module includes the 4th resistance, the 5th electricity
Resistance, the second metal-oxide-semiconductor and the second comparator, the 6th pin of the grid connection control chip of second metal-oxide-semiconductor, second metal-oxide-semiconductor
Source electrode pass through the 4th resistance connect the 5th resistance one end and driving power secondary negative terminal, the leakage of second metal-oxide-semiconductor
The pole connection other end of second resistance, the other end of the 5th resistance, the 5th pin of control chip and the anti-phase input of the second comparator
End, the in-phase input end of second comparator input the second reference voltage, and the output end of second comparator feeds back to drive
The primary of dynamic power supply, the output of control circuit.
In described constant power output LED drive power, the model PIC12F683 of the control chip.
In described constant power output LED drive power, first metal-oxide-semiconductor and the second metal-oxide-semiconductor are N-channel MOS pipe.
A kind of constant power output method using invariable power LED drive power as described above, comprise the following steps：
The first voltage sampled signal and output current regulation module feedback of control chip Rreceive output voltage regulator module feedback
Second voltage sampled signal；
Control chip calculates the real-time power output of LED drive power；
The more real-time power output of control chip and its default target output, and it is less than control core in real-time power output
During the default target output of piece, control output voltage adjusting module carries out voltage adjustment and/or control output current adjustment
Module carries out electric current adjustment, so that the real-time power output of the LED drive power reaches default target output.
In described constant power output method, the control chip calculates the step of the real-time power output of LED drive power
Suddenly specifically include：
Voltage computation unit calculates the real-time output voltage of LED drive power according to first voltage sampled signal；
Current calculation unit calculates the real-time output current of LED drive power according to first voltage sampled signal；
Power calculation unit calculates the real-time output work of LED drive power according to real-time output voltage and real-time output current
Rate.
Described constant power output method also includes：
Control chip is when real-time output voltage is more than the default maximum output voltage of control chip, or in real-time output current
During maximum output current default more than control chip, or in real-time power output it is more than the default maximum output of control chip
When power or the default current power output of control chip, output abnormality shutdown signal.
Compared to prior art, in constant power output LED drive power and its constant power output method provided by the invention,
The constant power output LED drive power includes being used to feed back first voltage sampled signal to control chip and adjusts LED drivings
The output voltage adjusting module of the real-time output voltage of power supply, for feeding back second voltage sampled signal to control chip and adjusting
The output current regulation module of the real-time output current of LED drive power and for receiving first voltage sampled signal and second
Voltage sampling signal and the real-time power output for calculating LED drive power, it is default to be less than control chip in real-time power output
During target output, control output voltage adjusting module carries out voltage adjustment and/or control output current regulation module is carried out
Electric current adjusts, so that the real-time power output of the LED drive power reaches default target output and control chip, institute
State control chip while connect the output voltage adjusting module and output current regulation module.The present invention passes through control chip meter
Real-time power output is calculated, and when real-time power output and goal-selling power output are inconsistent, is controlled using control chip defeated
Go out voltage regulator module and output current regulation module carries out voltage and/or electric current adjustment, so as to realize constant power output,
Impacting for over-voltage and over-current overshoot voltage when avoiding the LED light source from being started shooting, ensures the life-span of LED light source, so as to ensure to illuminate
Reliability, and be advantageous to the standardization of product, facilitate the selection of user, while also save cost.
Brief description of the drawings
Fig. 1 is the schematic diagram of constant power output LED drive power provided by the invention.
Fig. 2 is the structured flowchart of the control chip in constant power output LED drive power provided by the invention.
Fig. 3 is metal-oxide-semiconductor output characteristic curve figure.
Fig. 4 is the flow chart of constant power output method provided by the invention.
Fig. 5 is the flow chart of the step S2 in constant power output method provided by the invention.
Fig. 6 is the flow chart of a preferred embodiment of constant power output method provided by the invention.
Embodiment
The present invention provides a kind of constant power output LED drive power and its constant power output method, to make the mesh of the present invention
, technical scheme and effect it is clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.
It should be appreciated that specific embodiment described herein is not intended to limit the present invention only to explain the present invention.
Referring to Fig. 1, a kind of constant power output LED drive power provided by the invention, including output voltage adjusting module
1st, output current regulation module 2 and control chip 3, the control chip 3 connect the output voltage adjusting module 1 and defeated simultaneously
Go out current adjusting module 2.
Specifically, the output voltage adjusting module 1 is used to feed back first voltage sampled signal to control chip 3 and adjust
The real-time output voltage of whole LED drive power；The output current regulation module 2 is used to feed back second voltage sampled signal to control
Coremaking piece 3 and the real-time output current for adjusting LED drive power；The control chip 3 is used to receive first voltage sampled signal
With second voltage sampled signal and the real-time power output of LED drive power is calculated, is less than control chip in real-time power output
During default target output, control output voltage adjusting module 1 carries out voltage adjustment and/or control output current adjustment mould
Block 2 carries out electric current adjustment, so that the real-time power output of the LED drive power reaches default target output.
In other words, the output voltage of the secondary windings of transformer carries out voltage by the output voltage adjusting module 1
Sampling, output voltage adjusting module 1 send first voltage sampled signal to the circuit of reversed excitation of primary, become so as to limit
The maximum output voltage of depressor secondary windings, while the output voltage adjusting module 1 also sends first voltage sampled signal
To control chip 3, the output voltage of LED drive power is calculated by control chip 3；Likewise, the secondary windings of transformer
Output current is sampled by the output current regulation module 2, and output current regulation module 2 is by second voltage sampled signal
Send to the circuit of reversed excitation of primary, so that the maximum output current of limiting transformer secondary windings, while the output
Current adjusting module 2 also sends second voltage sampled signal to control chip 3, and LED drive power is calculated by control chip 3
Output current；Control chip 3 is further counted by the real-time output voltage for calculating LED drive power and real-time output current
The real-time power output of LED drive power is calculated, and by it compared with default target output, it is small in real-time power output
When default target output, control output voltage adjusting module 1 carries out voltage adjustment and/or control output current adjustment
Module 2 carries out electric current adjustment, specific to change output voltage adjusting module 1 and/or the sampling resistor of output current regulation module 2
Value, so as to change first voltage sampled signal and/or second voltage sampled signal, further such that the output of LED drive power
Voltage and output current change, further such that the real-time power output of the LED drive power reaches default target
Power output, preferentially in embodiment, the model PIC12F683 of the control chip 3, processing speed is fast, stable performance, when
So in other embodiments, the control chip of other models is also can be selected in the control chip 3, and the present invention is not limited this
It is fixed.
The present invention calculates real-time power output by using control chip, and is exported in real-time power output and goal-selling
When power is inconsistent, using control chip control output voltage adjusting module and output current regulation module carry out voltage and/or
Electric current adjusts, so as to realize constant power output, over-voltage and over-current overshoot voltage when avoiding the LED light source from being started shooting rushes
Hit, ensure the life-span of LED light source, so as to ensure the reliability of illumination, and be advantageous to the standardization of product, facilitate the choosing of user
Select, while also save cost.
Furthermore, it is understood that referring to Fig. 2, the control chip 3 includes：
Voltage computation unit 301, for calculating the real-time output voltage of LED drive power according to first voltage sampled signal；
Current calculation unit 302, the real-time output current of LED drive power is calculated for receiving second voltage sampled signal；
Power calculation unit 303, for calculating the real-time of LED drive power according to real-time output voltage and real-time output current
Power output；
Power adjustment unit 304, for by real-time power output compared with the default power output of control chip, and in reality
When power output when being less than default target output, control output voltage adjusting module carries out voltage adjustment and/or control
Output current regulation module carries out electric current adjustment, so that the real-time power output of the LED drive power reaches default target
Power output.
The voltage computation unit 301 and current calculation unit 302 connect the power calculation unit 303 simultaneously, described
Power calculation unit 303 is also connected with the power adjustment unit 304.
The present invention is handled first voltage sampled signal by voltage computation unit 301, is further calculated described
The real-time output voltage of LED drive power；Second voltage sampled signal is handled by current calculation unit 302, enters one
Step calculates the real-time output current of the LED drive power, and power calculation unit 303 is by real-time output voltage with exporting in real time
Electric current, which is multiplied, can obtain the real-time power output of LED drive power, recycle power adjustment unit 304 by real-time power output
Compared with the default target output of control chip, when real-time power output is less than default target output, control
Output voltage adjusting module carries out voltage adjustment and/or control output current regulation module carries out electric current adjustment, so that the LED
The real-time power output of driving power reaches default target output.
Furthermore, it is understood that the control chip 3 be additionally operable to real-time output voltage be more than the default maximum of control chip it is defeated
When going out voltage, either in real-time output current maximum output current default more than control chip or in real-time output work
When rate is more than the default peak power output of control chip or control chip default current power output, output abnormality closes letter
Number, remind the output abnormality of user's LED drive power or directly disconnect the power supply of LED drive power, so as to good
Impacting for over-voltage and over-current overshoot voltage when avoiding the LED light source from being started shooting, ensures the life-span of LED light source, so as to ensure to illuminate
Reliability, and electric elements that can also be in protection circuit are without damage.
Please continue to refer to Fig. 1, the output voltage adjusting module 1 includes first resistor R1, second resistance R2,3rd resistor
R3, the first metal-oxide-semiconductor V1 and first comparator AMP1, the first resistor R1 one end connect the secondary anode of driving power,
Other end connection second resistance R2 one end of the first resistor R1,3rd resistor R3 one end, first comparator AMP1
7th pin of inverting input and control chip 3, other end connection current adjusting module 2 and the first MOS of the second resistance R2
Pipe V1 source electrode, the 3rd pin of the grid connection control chip 3 of the first metal-oxide-semiconductor V1, the drain electrode of the first metal-oxide-semiconductor V1 connect
Connect the 3rd resistor R3 other end, in-phase input end the first reference voltage V of the input ref1 of the first comparator AMP1 is described
First comparator AMP1 output end feeds back to the primary of driving power, the output of control circuit.
Specifically, the present invention adjusts the resistance of sampling resistor using the change in resistance of the drain electrode of metal-oxide-semiconductor, so that
The first voltage sampled signal of output changes, further such that output voltage changes in real time, as shown in figure 3, the drain electrode resistance of metal-oxide-semiconductor
Value（Rds）It is to change, that is, variable resistor area, so after the first metal-oxide-semiconductor V1 is connected into circuit, first metal-oxide-semiconductor
Equivalent to one adjustable resistance of V1, controls the conducting depth of the first metal-oxide-semiconductor by the output control signal of control chip 3, and first
Resistance R1, second resistance R2 and 3rd resistor R3 can set the maximum of output voltage, i.e., exported when the first metal-oxide-semiconductor is fully on
The maximum of voltage, so as to prevent power supply to be powered initial stage because overtension damages LED light source, control chip 3 sends different
Control signal can control the first metal-oxide-semiconductor to realize different conducting states, so as to change the resistance of sampling resistor, further such that
The voltage of circuit of reversed excitation output changes.
Please continue to refer to Fig. 1, the output current regulation module 2 includes the 4th resistance R4, the 5th resistance R5, the 2nd MOS
Pipe V2 and the second comparator AMP2, the second metal-oxide-semiconductor V2 grid connect the 6th pin of control chip 3, second metal-oxide-semiconductor
V2 source electrode passes through the resistance R5 of the 4th resistance R4 connections the 5th one end and the secondary negative terminal of driving power, the 2nd MOS
The pipe V2 drain electrode connection second resistance R2 other end, the 5th resistance R5 other end, the 5th pin of control chip 3 and the second ratio
Compared with device AMP2 inverting input, the in-phase input end of the second comparator AMP2 the second reference voltage V of input ref2 is described
Second comparator AMP2 output end feeds back to the primary of driving power, the output of control circuit.
Specifically, the present invention adjusts the resistance of sampling resistor using the change in resistance of the drain electrode of the second metal-oxide-semiconductor, so as to
So that the second voltage sampled signal of output changes, further such that output current changes in real time, the second metal-oxide-semiconductor V2 is connected into electricity
Equivalent to one adjustable resistance of Lu Zhonghou, the second metal-oxide-semiconductor V2, second is controlled by the output control signal of control chip 3
Metal-oxide-semiconductor V2 conducting depth, the 4th resistance R4 and the 5th resistance R5 can set the maximum of output current, i.e. the second metal-oxide-semiconductor is complete
The maximum of output current during full conducting, so as to prevent power supply to be powered initial stage due to the excessive damage LED light source of electric current, control chip
3, which send different control signals, can control the second metal-oxide-semiconductor to realize different conducting states, so as to change the resistance of sampling resistor
Value, further such that the electric current of circuit of reversed excitation output changes.
Specifically, first metal-oxide-semiconductor and the second metal-oxide-semiconductor are N-channel MOS pipe.
In the present embodiment, the process that the control chip 3 adjusts real-time power output is a mistake progressively analyzed, increased
Journey, specifically, when judging that real-time power output is more than the default target output of control chip, control chip control
Output voltage adjusting module increases the output voltage of an amplitude, then calculate after power output now with target output
It is compared, when power output at this moment is still less than the target output, continuation controls output voltage adjusting module again
Increase the output voltage of an amplitude, by that analogy, until real-time power output stops after being equal to target output, work as output
Voltage regulator module adjusts output voltage to maximum output voltage, and the power output in real time is still less than target output
When, control chip control output current regulation module increases the output current of an amplitude, then calculates power output now
Afterwards compared with target output, when power output at this moment is still less than the target output, continuation controls again
Output current regulation module increases the output current of an amplitude, by that analogy, until real-time power output exports equal to target
Stop after power, so as to avoid the curtage in circuit from being impacted because caused by suddenly change is excessive.
Based on above-mentioned constant power output LED drive power, the present invention also correspondingly provides a kind of constant power output LED drivings
The constant power output method of power supply, referring to Fig. 4, methods described includes：
S100, control chip Rreceive output voltage regulator module feedback first voltage sampled signal and output current regulation module
The second voltage sampled signal of feedback；
S200, control chip calculate the real-time power output of LED drive power；
The more real-time power output of S300, control chip and its default target output, and be less than in real-time power output
During the default target output of control chip, control output voltage adjusting module carries out voltage adjustment and/or control output electricity
Flow adjusting module and carry out electric current adjustment, so that the real-time power output of the LED drive power reaches default target output work
Rate.
Referring to Fig. 5, the step S200 is specifically included：
S201, voltage computation unit calculate the real-time output voltage of LED drive power according to first voltage sampled signal；
S202, current calculation unit calculate the real-time output current of LED drive power according to first voltage sampled signal；
S203, power calculation unit calculate the real-time defeated of LED drive power according to real-time output voltage and real-time output current
Go out power.
Further, the constant power output method also includes：
Control chip is when real-time output voltage is more than the default maximum output voltage of control chip, or in real-time output current
During maximum output current default more than control chip, or in real-time power output it is more than the default maximum output of control chip
When power or the default current power output of control chip, output abnormality shutdown signal.
Due to invariable power LED drive power being described in detail above, herein no longer to invariable power LED drive power
Constant power output method repeated.
In order to be better understood from the present invention, technical scheme is elaborated below in conjunction with Fig. 6：
Step 10, configure the maximum of output voltage, the maximum of output current, the minimum value of output voltage, output current
Minimum value and target output Pc, wherein the maximum Vomax of the output voltage=(R1+R2//R3)/(R2//R3) *
Vref1(//:Resistor coupled in parallel is represented, same as below), maximum Iomax=Vref2/ (R4//R5) of the output current, institute
State minimum value Vomin=(R1+R2)/R2*Vref1 of output voltage, minimum value Iomin=Vref2/R4 of the output current；
Step 20, the initial output power Po, the initial output power Po=Io*Vo, wherein Io of calculating LED drive power are
Initial output current value, Vo are initial output voltage value；
Step 30, judge whether initial output voltage value is more than the maximum of output voltage, or initial output current value whether
Whether maximum or initial output power more than output current are more than target output, if it is, step 40 is performed,
Otherwise step 50 is performed；
Step 40, control chip output abnormality shutdown signal；
Step 50, the real-time power output Pt for calculating LED drive power, and judge whether real-time power output is more than target and exports
Power, if it is, performing step 40；Otherwise step 60 is performed；
Step 60, control output voltage adjusting module increase the output voltage Vadd of an amplitude；
Step 70, judge whether the output voltage values Vt after increasing is less than the maximum of output voltage, if it is perform step
80, otherwise perform step 90；
Step 80, judge whether power output now is less than target output, if it is, performing step 60；
Step 90, control output current regulation module increase the output current Iadd of an amplitude；
Step 100, judge whether the output current value It after increasing is less than the maximum of output current, if it is perform step
80。
It is described on end, in constant power output LED drive power and its constant power output method provided by the invention, the perseverance
Power output LED drive power includes output voltage adjusting module, output current regulation module and control chip, the control
Chip connects the output voltage adjusting module and output current regulation module simultaneously.The present invention is calculated real-time by control chip
Power output, and when real-time power output and goal-selling power output are inconsistent, output voltage is controlled using control chip
Adjusting module and output current regulation module carry out voltage and/or electric current adjustment, so as to realize constant power output, avoid
Impacting for over-voltage and over-current overshoot voltage when LED light source is started shooting, ensures the life-span of LED light source, can so as to ensure illumination
By property, and be advantageous to the standardization of product, facilitate the selection of user, while also save cost.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (10)
- A kind of 1. constant power output LED drive power, it is characterised in that including：Output voltage adjusting module, for feeding back first voltage sampled signal to control chip and adjusting the reality of LED drive power When output voltage；Output current regulation module, for feeding back second voltage sampled signal to control chip and adjusting the reality of LED drive power When output current；Control chip, for receiving first voltage sampled signal and second voltage sampled signal and the reality for calculating LED drive power When power output, when real-time power output is less than the default target output of control chip, control output voltage adjustment mould Block carries out voltage adjustment and/or control output current regulation module carries out electric current adjustment, so that the LED drive power is real-time Power output reaches default target output；The control chip connects the output voltage adjusting module and output current regulation module simultaneously.
- 2. constant power output LED drive power according to claim 1, it is characterised in that the control chip includes：Voltage computation unit, for calculating the real-time output voltage of LED drive power according to first voltage sampled signal；Current calculation unit, the real-time output current of LED drive power is calculated for receiving second voltage sampled signal；Power calculation unit, for calculating the real-time defeated of LED drive power according to real-time output voltage and real-time output current Go out power；Power adjustment unit, for by real-time power output compared with the default power output of control chip, and real-time When power output is less than default target output, control output voltage adjusting module carries out voltage adjustment and/or control is defeated Go out current adjusting module and carry out electric current adjustment, so as to reach default target defeated for the real-time power output of the LED drive power Go out power.
- 3. constant power output LED drive power according to claim 2, it is characterised in that the control chip is additionally operable to It is more than control chip in real-time output voltage maximum output voltage default more than control chip, or in real-time output current During default maximum output current, or it is more than the default peak power output of control chip in real-time power output or controls core During the default current power output of piece, output abnormality shutdown signal.
- 4. constant power output LED drive power according to claim 3, it is characterised in that the output voltage adjusts mould Block includes first resistor, second resistance, 3rd resistor, the first metal-oxide-semiconductor and first comparator, one end connection of the first resistor The secondary anode of driving power, other end connection one end of second resistance of the first resistor, one end of 3rd resistor, the The inverting input of one comparator and the 7th pin of control chip, the second resistance the other end connection current adjusting module and The source electrode of first metal-oxide-semiconductor, the 3rd pin of the grid connection control chip of first metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor connect The other end of 3rd resistor is connect, the in-phase input end of the first comparator inputs the first reference voltage, the first comparator Output end feed back to the output of the primary of driving power, control circuit.
- 5. constant power output LED drive power according to claim 4, it is characterised in that the output current adjusts mould Block includes the 4th resistance, the 5th resistance, the second metal-oxide-semiconductor and the second comparator, the grid connection control chip of second metal-oxide-semiconductor The 6th pin, the source electrode of second metal-oxide-semiconductor by the 4th resistance connect the 5th resistance one end and driving power it is secondary negative End, second metal-oxide-semiconductor drain electrode connection the other end of second resistance, the other end of the 5th resistance, control chip the 5th pin and The inverting input of second comparator, the in-phase input end of second comparator input the second reference voltage, second ratio Output end compared with device feeds back to the output of the primary of driving power, control circuit.
- 6. constant power output LED drive power according to claim 5, it is characterised in that the model of the control chip For PIC12F683.
- 7. constant power output LED drive power according to claim 6, it is characterised in that first metal-oxide-semiconductor and second Metal-oxide-semiconductor is N-channel MOS pipe.
- A kind of 8. constant power output side of constant power output LED drive power using as described in claim 1-7 any one Method, it is characterised in that comprise the following steps：The first voltage sampled signal and output current regulation module feedback of control chip Rreceive output voltage regulator module feedback Second voltage sampled signal；Control chip calculates the real-time power output of LED drive power；The more real-time power output of control chip and its default target output, and it is less than control core in real-time power output During the default target output of piece, control output voltage adjusting module carries out voltage adjustment and/or control output current adjustment Module carries out electric current adjustment, so that the real-time power output of the LED drive power reaches default target output.
- 9. constant power output method according to claim 8, it is characterised in that the control chip calculates LED driving electricity The step of real-time power output in source, specifically includes：Voltage computation unit calculates the real-time output voltage of LED drive power according to first voltage sampled signal；Current calculation unit calculates the real-time output current of LED drive power according to first voltage sampled signal；Power calculation unit calculates the real-time output work of LED drive power according to real-time output voltage and real-time output current Rate.
- 10. constant power output method according to claim 9, it is characterised in that also include：Control chip is when real-time output voltage is more than the default maximum output voltage of control chip, or in real-time output current During maximum output current default more than control chip, or in real-time power output it is more than the default maximum output of control chip When power or the default current power output of control chip, output abnormality shutdown signal.
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