CN104768259B - Adaptive LED booster driving circuit - Google Patents
Adaptive LED booster driving circuit Download PDFInfo
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- CN104768259B CN104768259B CN201410002140.2A CN201410002140A CN104768259B CN 104768259 B CN104768259 B CN 104768259B CN 201410002140 A CN201410002140 A CN 201410002140A CN 104768259 B CN104768259 B CN 104768259B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- 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
Abstract
The invention discloses a kind of adaptive LED booster driving circuits, detect the voltage of the second divider resistance in voltage feedback circuit automatically by adaptation control circuit, boosting driving is carried out to automatically control the corresponding boosting driving method of booster driving circuit selection, when the voltage of detection is less than first voltage preset value, low level is exported to the scheme control end, the booster driving circuit strobe pulse frequency modulating technology carries out boosting driving, when the voltage of detection is greater than the first voltage preset value, high level is exported to the scheme control end, the booster driving circuit strobe pulse width modulation technology carries out boosting driving.The step of by automatically selecting boosting driving method, the problem of which boosting driving method of selection is driven can not be determined when payload size is indefinite by avoiding, and also save measurement light source resistance sizes, is easy to use and saves driving time.
Description
Technical field
The present invention relates to lighting technical fields, more particularly to a kind of adaptive LED booster driving circuit.
Background technique
Light emitting diode (Light-Emitting Diode, LED) is a kind of semiconductor electronic component that can be luminous.By gallium
With arsenic, phosphorus compound made of diode, when electronics and when hole-recombination can give off visible light, thus can be used to be made
Light emitting diode.Indicator light, or composition text or number display are used as in circuit and instrument.With technology it is continuous into
Step, light emitting diode have been widely used in display, television set daylighting decoration and illumination.
The power supply circuit of traditional LED is all storage battery power supply, and booster circuit is needed to be driven.Traditional boosting drives electricity
Road includes pulse width modulating technology and pulse frequency modulated technology, when carrying out boosting driving, selects arteries and veins for small LED load
It rushes frequency modulating technology to be driven, be driven for big LED load strobe pulse width modulation technology.
But for the indefinite situation of payload size, it can not determine which boosting driving method of selection is driven, need
It first to determine payload size reselection driving circuit, be more troublesome.
Summary of the invention
Based on this, it is necessary to need first to determine that payload size carries out asking for boosting driving again for payload size is indefinite
Topic provides a kind of adaptive LED booster driving circuit for not needing to determine that payload size can directly be driven.
A kind of adaptive LED booster driving circuit, comprising:
Inductor, connects the anode of power supply and LED light source, and the cathode of the LED light source connects ground potential；The light source,
Inductor and LED light source constitute major loop；
Booster driving circuit, including power end, output end, scheme control end and pressure feedback port, the power end connection
The power supply, the output end connect the common end of the inductor and the LED light source；
Voltage feedback circuit, including the first divider resistance and the second divider resistance, first divider resistance and second point
The LED light source in parallel after piezoresistance series connection；The pressure feedback port of the booster driving circuit connects first divider resistance
With the common end of the second divider resistance；
Adaptation control circuit, including signal input part and signal output end, the signal input part connection described first
The common end of divider resistance and the second divider resistance, the signal output end connect the scheme control end；When the voltage of detection
When less than first voltage preset value, the adaptation control circuit is exported by the signal output end to the scheme control end
Low level, the booster driving circuit strobe pulse frequency modulating technology carry out boosting driving, when the voltage of detection is greater than described
When first voltage preset value, high level, the booster driving circuit strobe pulse width modulated are exported to the scheme control end
Technology carries out boosting driving.
In one of the embodiments, the adaptation control circuit include concatenated analog-to-digital conversion module, single-chip microcontroller and
Pull down resistor, the analog-to-digital conversion module connects the common end of first divider resistance and second divider resistance, described
Pull down resistor connects the scheme control end, the other end ground connection of the pull down resistor with the common end of the single-chip microcontroller.
The adaptation control circuit further includes filter module in one of the embodiments, the filter module connection
The signal detection end of the analog-to-digital conversion module.
The first voltage preset value is 1.5V in one of the embodiments,.
When the voltage of the pressure feedback port is less than second voltage preset value in one of the embodiments, the boosting
Driving circuit increases the voltage of the output end output；When the voltage of the pressure feedback port is greater than second voltage preset value,
The booster driving circuit closes output.
The booster driving circuit further includes enable end in one of the embodiments, and the enable end is opened by touch-control
Connection connects the power supply, the touch switch closure, and high level is connected in the enable end, and the booster driving circuit starts work
Make；The touch switch disconnects, and the enable end is hanging, and the booster driving circuit stops working.
In one of the embodiments, the booster driving circuit be TPS61086 chip, the 8 of the TPS61086 chip
The end pin IN is the power end, is used as the output end after 6 ends pin SW, the connection of 7 ends pin SW, 9 ends pin MODE are institute
Scheme control end is stated, 2 ends pin FB are the pressure feedback port.
When the operating temperature of the booster driving circuit is more than preset temperature in one of the embodiments, the boosting
Driving circuit is automatically closed.
The adaptive LED booster driving circuit further includes filter condenser in one of the embodiments, the filtering
The capacitor LED light source in parallel.
The adaptive LED booster driving circuit further includes light source protection circuit in one of the embodiments, the light
Protection circuit first divider resistance in parallel.
Above-mentioned adaptive LED booster driving circuit is detected by adaptation control circuit automatically in voltage feedback circuit
The voltage of two divider resistances, so that automatically controlling the corresponding boosting driving method of booster driving circuit selection carries out boosting driving,
When the voltage of detection is less than first voltage preset value, low level, the booster driving circuit are exported to the scheme control end
Strobe pulse frequency modulating technology carries out boosting driving, when the voltage of detection is greater than first voltage preset value, to the mode
Control terminal exports high level, and the booster driving circuit strobe pulse width modulation technology carries out boosting driving.By selecting automatically
Boosting driving method is selected, avoiding can not determine what which boosting driving method of selection was driven when payload size is indefinite
Problem also saves the step of measuring light source resistance sizes, is easy to use and saves driving time.
Detailed description of the invention
Fig. 1 is the adaptive LED booster driving circuit schematic diagram of one embodiment of the invention；
Fig. 2 is the adaptive LED booster driving circuit schematic diagram of another embodiment of the present invention.
Specific embodiment
A kind of adaptive LED booster driving circuit, the size of current of the LED light source by detecting access circuit automatically, and
The circuit for carrying out boosting driving is automatically selected according to size of current, is avoided in the indefinite situation of payload size, can not be determined
The problem of selecting which boosting driving method to be driven, also saves the step of measuring light source resistance sizes, is easy to use simultaneously
Save driving time.Also, above-mentioned adaptive LED booster driving circuit realizes over-voltage, under-voltage using TPS61-86 chip
And overheating protection function.Also, above-mentioned adaptive LED booster driving circuit by using light adjusting circuit realize dimming light source and
The function of Bright Source Protection.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It is the adaptive LED booster driving circuit schematic diagram of one embodiment of the invention shown in Fig. 1.With reference to Fig. 1, one kind is certainly
Adapt to LED booster driving circuit, including inductor 120, booster driving circuit 140, voltage feedback circuit 160 and self adaptive control
Circuit 180.Above-mentioned inductor 120 connects the anode of power supply 200 and LED light source 300, power supply 200, inductor 120 and LED light source
300 constitute major loop.Above-mentioned LED light source 300 is connected in series for series of LED, and the cathode connection ground electricity of LED light source 300
Position.Booster driving circuit 140 includes power end A, output end B, pressure feedback port C and scheme control end D, booster driving circuit
140 power end A connection power supply 200, the common end of output end B connection inductor 120 and LED light source 300.Voltage feedback circuit
160 include that the first divider resistance R1 and the second divider resistance R2, above-mentioned first divider resistance R1 and the second divider resistance R2 connects
Parallel connection LED light source 300 afterwards, the above-mentioned first divider resistance R1 and second of pressure feedback port C connection of above-mentioned booster driving circuit 140
The common end of divider resistance R2.Adaptation control circuit 180 includes signal input part and signal output end (not shown), adaptively
The signal input part of control circuit 180 connects the common end of above-mentioned first divider resistance R1 and the second divider resistance R2, and signal is defeated
Outlet connects the scheme control end D of above-mentioned booster driving circuit 140；Adaptation control circuit 180 detects the second divider resistance R2
Voltage, when the voltage detected is less than first voltage preset value, adaptation control circuit 180 is by signal output end to mould
Formula control terminal D exports low level, and 140 strobe pulse frequency modulating technology of booster driving circuit carries out boosting driving, when detecting
Voltage be greater than above-mentioned first voltage preset value when, to scheme control end D export high level, booster driving circuit 140 select arteries and veins
It rushes width modulation technology and carries out boosting driving.
By automatically selecting boosting driving method, avoids in the indefinite situation of payload size, where can not determine selection
The problem of one boosting driving method is driven, also saves the step of measuring light source resistance sizes, is easy to use and saves
Driving time.
Traditional LED illumination driving uses switching circuit, low in energy consumption, the drive efficiency height of this circuit itself.It opens
The type on powered-down road can probably be divided into pulse width modulation (Pulse Width Modulation, PWM) and pulse frequency modulated
(Pulse frequency modulation, PFM).Wherein PWM be mainly used in, heavy-loaded circuit, PFM is mainly used for gently negative
Carry circuit.PWM technology be frequency width and narrow variation, PFM technology be frequency with and without variation, PWM technology is to utilize
Square-wave pulse width control output, PFM technology are to utilize the presence or absence of pulse control output.The difference of PWM technology and PFM technology exists
In: for the PFM technology and PWM technology the same for peripheral circuit, when reaching its peak efficiencies, PFM technology and PWM technology
Efficiency it is suitable, but before peak efficiencies, the efficiency far of PFM technology is higher than the efficiency of PWM technology, this is PFM technology
Main advantage and PFM technology are suitble to light load, PWM technology to be suitble to heavy duty reason；PWM technology is due to error amplifier
Influence, loop gain and response speed be restricted, and PFM technology has faster response speed, and PWM technology is entirely working
Period frequency is fixed, and PFM technology is not, therefore, PFM technology compare PWM technology major defect be to filter it is tired
It is difficult；PFM technical controlling wants expensive compared to PWM technical controlling IC price, and it is easy that PWM Control Technique implements, PFM controlling party
Method, which implements, to be less susceptible to, so, in practical application, common greatly is PWM control, and rare PFM is controlled.
Further, above-mentioned booster driving circuit 140 further includes enable end (not shown).It is opened by touch-control above-mentioned enable end
Close 190(and refer to Fig. 2) power supply 200 is connected, touch switch 190 is closed, and high level is connected in enable end, and booster driving circuit 140 is opened
Beginning work；Touch switch 190 disconnects, and enable end is hanging, and booster driving circuit 140 stops working.
In another embodiment, above-mentioned enable end can also connect time base circuit (not shown), and be provided by time base circuit
Enable signal.Above-mentioned time base circuit can be by exporting PWM square-wave signal, and can pass through the periphery electricity of the above-mentioned time base circuit of setting
Road adjusts the size of above-mentioned PWM square-wave signal, to realize the light modulation to LED light source 300.
It is the adaptive LED booster driving circuit schematic diagram of another embodiment of the present invention shown in Fig. 2.
With reference to Fig. 2, above-mentioned adaptation control circuit 180 include concatenated analog-to-digital conversion module 182, single-chip microcontroller 184 and under
Pull-up resistor R3.Above-mentioned analog-to-digital conversion module 182 connects the common end of the first divider resistance R1 and the second divider resistance R2, single-chip microcontroller
The other end of the common end connection mode control terminal D of 184 and pull down resistor R3, pull down resistor R3 are grounded.For analog-to-digital conversion mould
Block 182, the one end for connecting the common end of above-mentioned first divider resistance R1 and the second divider resistance R2 is analog-to-digital conversion module 182
Signal detection end, be also the signal input part of above-mentioned adaptation control circuit 180；For adaptation control circuit 180, connection
One end of above-mentioned scheme control end D is the signal output end of above-mentioned adaptation control circuit 180.
Above-mentioned analog-to-digital conversion module 182 detects the current analog signal on above-mentioned voltage feedback circuit 160, and by above-mentioned electricity
Flow field simulation signal is converted into voltage digital signal and is transferred to above-mentioned single-chip microcontroller 184, if the voltage of above-mentioned voltage digital signal
Size is more than first voltage preset value, it is larger to indicate that LED light source 300 loads, single-chip microcontroller 166 exports high level and gives scheme control end
D；If above-mentioned voltage be less than first voltage preset value, indicate LED light source 300 load it is smaller, single-chip microcontroller 166 export low level to
Scheme control end D.Specifically, above-mentioned first preset value is 1.5V.In other examples, above-mentioned pre-set current value can also be
0.8V-1.5V needs to set according to specific driving circuit.
Above-mentioned analog-to-digital conversion module 182 is AD conversion chip, carries out AD detection by above-mentioned analog-to-digital conversion module 182.?
In other embodiments, above-mentioned single-chip microcontroller 184 also built-in analog-to-digital conversion module 182.
Further, with reference to Fig. 2, above-mentioned adaptation control circuit 180 further includes filter module 186, and filter module 186 connects
The signal detection end for connecing analog-to-digital conversion module 182, for filtering out the text on the major loop that inductor L and LED light source 300 are constituted
Wave, electromagnetic wave or other fluctuations.Specifically, above-mentioned filter module 186 is low-pass filter circuit, high-pass filtering circuit or band logical
One of filter circuit, or to combine the compound filter circuit of above-mentioned filter circuit.In other examples, above-mentioned filtering mould
Block 186 can also be filtering chip.
With reference to Fig. 2, above-mentioned booster driving circuit 140 is specially TPS61086 chip.
1 end pin COMP of TPS61086 chip is compensating end, can be with by being grounded after series resistance R5 and capacitor C1
Improve load transient response ability.Specifically, above-mentioned R5 resistance value is 16k Ω, the capacitor of capacitor is 2.7nF.
2 ends pin FB of TPS61086 chip are pressure feedback port (i.e. above-mentioned pressure feedback port C, with reference to Fig. 1), connection string
The common end of the first divider resistance R1 and the second divider resistance R2 of connection.
If the voltage on the output voltage of the common end of resistance R4 and R5, that is, FB pin is VS, the maximum value of VS cannot surpass
Cross 18.5V.Specifically, the calculation formula of above-mentioned resistance R4, resistance R5 resistance value size are as follows: Wherein VFB=1.238V is feedback regulation voltage, that is, second voltage preset value.Voltage on FB pin
When less than this feedback regulation voltage value, TPS61086 chip increases the voltage of output end output, realizes under-voltage protection；When FB pin
On voltage be greater than this feedback regulation voltage value when, TPS61086 chip close output, realize overvoltage protection.Specifically, another
In one embodiment, when the voltage at the end FB is higher than the 3% of the normal value (1.238V) of feedback regulation voltage, TPS61086 chip meeting
Output is closed, restores to work normally when the voltage at the end FB returns to normal value, i.e., above-mentioned second preset value is 1.238*(1+
3%) V.Maloperation when further, in order to prevent under-voltage, when the voltage of power supply VCC is lower than 2.2V, above-mentioned boosting driving electricity
Road 140 is in the present embodiment TPS61086 chip, can close output, further ensure the stability of circuit overall operation.
Further, with reference to Fig. 2, above-mentioned adaptive LED booster driving circuit further includes light source protection circuit 170, above-mentioned
The above-mentioned first divider resistance R1 in parallel of light source protection circuit 170 causes major loop output overvoltage for breaking down in circuit
When, LED light source 300 is protected.Specifically, above-mentioned light source protection circuit 170 can be concatenated voltage-stabiliser tube ZD and current limliting electricity
Hinder R4.Wherein, above-mentioned voltage-stabiliser tube ZD can be 15V, and above-mentioned resistance R4 is to be limited when voltage-stabiliser tube ZD is reversed breakdown
Stream.In other examples, above-mentioned light source protection circuit 170 can also above-mentioned LED light source 300 directly in parallel, it is defeated in major loop
LED light source 300 is protected when over-voltage out.
3 ends pin EN of TPS61086 chip are the enable end of TPS61086 chip, i.e., above-mentioned booster driving circuit 140
Enable end, by connecting key K connection power supply 200, when key K is closed, the enable end end EN input high level, TPS61086 chip
It is powered and opens work, on the contrary, enable end EN is hanging, and TPS61086 chip power loss stops working when key K is disconnected.In others
In embodiment, above-mentioned touch switch 190 can also be the common touch switch except key K.
In another embodiment, above-mentioned enable end EN can also connect time base circuit (not shown), and by it is above-mentioned when base electricity
Road provides enable signal.The above-mentioned exportable PWM square-wave signal of time base circuit, and can be electric by the way that the periphery of above-mentioned time base circuit is arranged
Road adjusts the size of above-mentioned PWM square-wave signal amplitude, dims to realize to LED light source 300.
4 pins, 5 pins, that is, end AGND and the end PGND of TPS61086 chip, are separately connected ground potential.TPS61086 chip
6 pins, 7 pins be respectively the end SW, above-mentioned 6 pin, 7 pins connection after as TPS61086 chip output end it is (i.e. above-mentioned
The output end B of booster driving circuit 140, with reference to Fig. 1), the output end of above-mentioned TPS61086 chip connects inductor L in major loop
With the common end of LED light source 300.Output is to upper after TPS61086 chip amplifies the enable end EN voltage signal inputted
Major loop is stated, to drive LED light source 300.
Specifically, the inductance size of above-mentioned inductor L is 3.3uH-5uH, calculation formula is as follows: L=(VIN/Vs)2*((VS-
VIN)/(IOUT*fS))*(η/0.35).Wherein VINFor the input voltage of inductor L, IOUTFor the output electric current of inductor L, η is electricity
Road efficiency, in the present embodiment, foregoing circuit efficiency concretely 90%；fSFor the work frequency of the switching tube of TPS61086 chip
Rate, f in the present embodimentSFor fixed frequency 1.2MHz.
8 ends pin IN of TPS61086 chip be TPS61086 chip power end (i.e. above-mentioned booster driving circuit 140
Power end A, with reference to Fig. 1), power supply VCC(, that is, power supply 200 is connected, with reference to Fig. 1), power supply VCC is battery in the present embodiment,
General output voltage is 2.3V-6V.
Further, above-mentioned adaptive LED booster driving circuit further includes filter circuit 150, connects TPS61086 chip
Power end IN, for input supply terminal IN power supply signal carry out High frequency filter.Specifically, above-mentioned filter circuit 150 is
Ceramic disc capacitor C3.Further, above-mentioned adaptive LED booster driving circuit further includes electric source filter circuit 130, is connected to power supply
VCC output end, the power supply signal for exporting to power supply VCC carry out low frequency filtering.Specifically, above-mentioned electric source filter circuit 130
For electrolytic capacitor C4.
9 ends pin MODE of TPS61086 chip are scheme control end (the i.e. above-mentioned boosting driving electricity of TPS61086 chip
The scheme control end D on road 140, with reference to Fig. 1), when above-mentioned scheme control end MODE input high level, TPS61086 chip is used
PWM technology carries out boosting driving, when above-mentioned scheme control end MODE input low level, TPS61086 chip using PFM technology into
Row boosting driving.Shown in Fig. 2, above-mentioned scheme control end MODE connects the common end of above-mentioned single-chip microcontroller 184 and pull down resistor R3, single
When piece machine 184 exports high level, TPS61086 chip carries out boosting driving using PWM technology；Single-chip microcontroller 184 exports low level
When, TPS61086 chip carries out boosting driving using PFM technology.
10 pin SS pins of TPS61086 chip are soft start pin, after being grounded by capacitor C2, TPS61086 core
Piece will carry out soft start, can prevent the interference of surge current.The capacitor of usual above-mentioned capacitor C2 is 100nF, when it is above-mentioned from
It adapts to LED booster driving circuit to be powered, when the enable end end EN detects high level, capacitor C2 is charged to 0.3V at once, so
Continue to charge with the electric current of 10uA afterwards, until output voltage reaches the 90% of rated value.When circuit, which is closed, to be inputted, capacitor
Device C2 discharges over the ground.The capacitance of capacitor C2 is bigger, and Anti-surging ability is stronger.
Also, when the operating temperature of above-mentioned booster driving circuit 140 is more than preset temperature, booster driving circuit 140 is automatic
It closes.In the embodiment depicted in figure 2, when the operating temperature of TPS61086 chip is more than preset temperature, in TPS61086 chip
Switching tube disconnects automatically, and TPS61086 chip stops working.Specifically, above-mentioned preset temperature is 150 DEG C.Above-mentioned TPS61086 core
The operating temperature that piece allows is within 136 DEG C, and when operating temperature reaches 150 DEG C, TPS61086 chip is automatically stopped work, directly
To circuit temperature be lower than 136 DEG C when, TPS61086 chip restore work normally.
Further, with reference to Fig. 2, above-mentioned adaptive LED booster driving circuit further includes filter condenser C5, filter capacitor
Device C5 parallel connection LED light source 300.
It is additionally provided on the major loop that above-mentioned inductor L and LED light source 300 are constituted unidirectional conducting switch (figure is not marked), it is single
Guide opens up the anode for closing and being separately connected inductor L and LED light source 300, for preventing the charge of above-mentioned capacitor C5 from upward
State the output end B reflux of inductor L and booster driving circuit 140.Specifically, above-mentioned unidirectional conducting switch is two pole of one-way conduction
Pipe D.
When the power end IN of TPS61086 chip is powered, enable end EN connection high level, the switch in TPS61086 chip
Pipe is opened, and SW end and PGND end of the electric current of power supply VCC input through inductor L, TPS61086 chip constitute circuit.In this phase
Between, inductor L storage energy, LED light source 300 is powered by capacitor C5 entirely.When the switching tube of TPS61086 chip is closed, by
It powers through one-way conduction diode D to capacitor C5 and LED light source 300 in the energy of the effect of back-emf, inductor L storage.
Due to the presence of one-way conduction diode D, the charge of capacitor C5 cannot be returned to the end SW of inductor L or TPS61086 chip
Stream.
Below with reference to the principle of embodiment illustrated in fig. 2 circuit, to the principle of adaptive LED booster driving circuit of the present invention into
Row is further described in detail.
Power supply VCC exports the voltage of 2.3V-6V, passes through inductor L, one-way conduction diode D and LED light source 300 all the way
The major loop of composition, wherein the cathode of LED light source 300 is grounded.
The 8 of TPS61086 chip is input to after capacitor C3 carries out low-pass filtering, capacitor C4 carries out high-pass filtering all the way
Pin power end IN provides operating voltage for TPS61086 chip.When key K is disconnected, 3 pin enable ends of TPS61086 chip
EN is hanging, and the switching tube in TPS61086 chip is opened, and TPS61086 chip does not work；When key K closure, TPS61086 core
3 pin enable end EN of piece access high level, and the switching tube closure in TPS61086 chip, TPS61086 chip opens work.
During the switching tube of TPS61086 chip is opened, the electric current of power supply VCC output is through inductor L, TPS61086
The end SW, the end PGND of chip constitute circuit, and during this period, inductor L stores energy, and LED light source 300 is powered by capacitor C5 entirely.
When the switching tube of TPS61086 chip is closed, due to the effect of back-emf, the energy of inductor L storage passes through one-way conduction two
Pole pipe D powers to capacitor C5 and LED light source 300.Due to the presence of one-way conduction diode D, the charge of capacitor C5 cannot be to electricity
It flows back at the end SW of sensor L or TPS61086 chip.
Voltage feedback circuit 160, i.e., concatenated first divider resistance R1 and the second divider resistance R2, parallel connection LED light source
The end pressure feedback port FB of 300, TPS61086 chips connects the public of above-mentioned first divider resistance R1 and the second divider resistance R2
End.When the voltage at the end FB is greater than second voltage preset value, TPS61086 chip stops working, and realizes overvoltage protection；Work as FB
When the voltage at end is less than second voltage preset value, TPS61086 chip increases the voltage of output end output, realizes under-voltage protection.
Specifically, above-mentioned second voltage preset value is 1.238V.
Adaptation control circuit 180 detects the current analog signal on voltage feedback circuit 160, filters through filter module 186
After wave, above-mentioned current analog signal is converted into voltage digital signal and is transferred to above-mentioned single-chip microcontroller by analog-to-digital conversion module 182
184, if the voltage swing of above-mentioned voltage digital signal is more than first voltage preset value, it is larger to indicate that LED light source 300 loads,
Single-chip microcontroller 184 exports high level and gives scheme control end MODE；If above-mentioned voltage is less than first voltage preset value, LED light is indicated
The load of source 300 is smaller, and single-chip microcontroller 184 exports low level and gives scheme control end MODE.Specifically, above-mentioned first voltage preset value is
1.5V。
When the scheme control end MODE of TPS61086 chip receives high level, TPS61086 chip is carried out using PWM technology
Boosting driving, when scheme control end MODE receives low level, TPS61086 chip carries out boosting driving using PFM technology.
It is grounded after 1 end pin COMP series resistance R5 and capacitor C1 of TPS61086 chip, load transient can be improved
Responding ability.
2 ends pin FB of TPS61086 chip connect the common end of concatenated resistance R4 and R5, after resistance R4 connects with R5
It is separately connected the output end and ground potential of one-way conduction diode D, for carrying out Voltage Feedback.When the voltage at the end FB is less than feedback
When adjusting voltage, TPS61086 chip increases output voltage, realizes under-voltage protection；It is adjusted when the voltage on FB pin is greater than this feedback
When saving voltage value, TPS61086 chip closes output, realizes overvoltage protection.In embodiment illustrated in fig. 2, above-mentioned feedback regulation voltage
For 1.238V.
The above-mentioned both ends first divider resistance R1 parallel connection LED light source 300 protect circuit 170, including concatenated voltage-stabiliser tube ZD and
Resistance R4 when causing major loop output overvoltage, protects LED light source 300, above-mentioned resistance for breaking down in circuit
R4 is to carry out current limliting when voltage-stabiliser tube ZD is reversed breakdown.
4 pins, 5 pins, that is, end AGND and the end PGND of TPS61086 chip, are separately connected ground potential.TPS61086 chip
10 pin SS pins be soft start pin, by capacitor C2 be grounded after, TPS61086 chip will carry out soft start, can prevent
The interference of surge current.
Also, when the operating temperature of above-mentioned TPS61086 chip is higher than 150 DEG C, TPS61086 chip is automatically stopped work
Make, until TPS61086 chip restores to work normally when the temperature of circuit is lower than 136 DEG C.
To sum up, above-mentioned adaptive LED booster driving circuit can divide the upper divider resistance of driving circuit by detecting automatically
Voltage swing driven to automatically select corresponding boosting driving method, it is simple and convenient；And overheat, mistake may be implemented
Pressure, under-voltage protection, keep circuit more safe and reliable.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of adaptive LED booster driving circuit characterized by comprising
Inductor, connects the anode of power supply and LED light source, and the cathode of the LED light source connects ground potential；The power supply, inductance
Device and LED light source constitute major loop；
Booster driving circuit, including power end, output end, scheme control end and pressure feedback port, described in power end connection
Power supply, the output end connect the common end of the inductor and the LED light source；
Voltage feedback circuit, including the first divider resistance and the second divider resistance, first divider resistance and the second partial pressure electricity
The LED light source in parallel after resistance series connection；The pressure feedback port of the booster driving circuit connects first divider resistance and the
The common end of two divider resistances；
Adaptation control circuit, including signal input part and signal output end, signal input part connection first partial pressure
The common end of resistance and the second divider resistance, the signal output end connect the scheme control end；When the voltage of detection is less than
When first voltage preset value, the adaptation control circuit exports low electricity to the scheme control end by the signal output end
Flat, the booster driving circuit strobe pulse frequency modulating technology carries out boosting driving, when the voltage of detection is greater than described first
When voltage preset value, high level, the booster driving circuit strobe pulse width modulation technology are exported to the scheme control end
Carry out boosting driving.
2. adaptive LED booster driving circuit according to claim 1, which is characterized in that the adaptation control circuit
Including concatenated analog-to-digital conversion module, single-chip microcontroller and pull down resistor, the analog-to-digital conversion module connects first divider resistance
With the common end of second divider resistance, the pull down resistor connects the scheme control with the common end of the single-chip microcontroller
End, the other end ground connection of the pull down resistor.
3. adaptive LED booster driving circuit according to claim 2, which is characterized in that the adaptation control circuit
It further include filter module, the filter module connects the signal detection end of the analog-to-digital conversion module.
4. adaptive LED booster driving circuit according to claim 1, which is characterized in that the first voltage preset value
For 1.5V.
5. adaptive LED booster driving circuit according to claim 1, which is characterized in that the electricity of the pressure feedback port
When pressure is less than second voltage preset value, the booster driving circuit increases the voltage of the output end output；When the voltage is anti-
When presenting the voltage at end greater than second voltage preset value, the booster driving circuit closes output.
6. adaptive LED booster driving circuit according to claim 1, which is characterized in that the booster driving circuit is also
Including enable end, the enable end connects the power supply by touch switch, and the touch switch closure, the enable end is connected
High level, the booster driving circuit are started to work；The touch switch disconnects, and the enable end is hanging, the boosting driving
Circuit stops working.
7. adaptive LED booster driving circuit according to claim 1, which is characterized in that the booster driving circuit is
TPS61086 chip, 8 ends pin IN of the TPS61086 chip are the power end, 6 ends pin SW, the connection of 7 ends pin SW
It is used as the output end afterwards, 9 ends pin MODE are the scheme control end, and 2 ends pin FB are the pressure feedback port.
8. adaptive LED booster driving circuit according to claim 7, which is characterized in that the booster driving circuit
When operating temperature is more than preset temperature, the booster driving circuit is automatically closed.
9. adaptive LED booster driving circuit according to claim 1, which is characterized in that the adaptive LED boosting is driven
Dynamic circuit further includes filter condenser, the filter condenser LED light source in parallel.
10. adaptive LED booster driving circuit according to claim 1, which is characterized in that the adaptive LED boosting
Driving circuit further includes light source protection circuit, the light source protection circuit first divider resistance in parallel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410002140.2A CN104768259B (en) | 2014-01-02 | 2014-01-02 | Adaptive LED booster driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410002140.2A CN104768259B (en) | 2014-01-02 | 2014-01-02 | Adaptive LED booster driving circuit |
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| CN104768259A CN104768259A (en) | 2015-07-08 |
| CN104768259B true CN104768259B (en) | 2018-12-11 |
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|---|---|---|---|
| CN201410002140.2A Active CN104768259B (en) | 2014-01-02 | 2014-01-02 | Adaptive LED booster driving circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768353B (en) * | 2018-05-31 | 2022-05-17 | 苏州佳世达光电有限公司 | Driving circuit |
| CN111556624A (en) * | 2020-05-15 | 2020-08-18 | 广州奕至家居科技有限公司 | Lamp strip connector, lamp strip control system and lamp strip power supply method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201550321U (en) * | 2009-09-28 | 2010-08-11 | 康佳集团股份有限公司 | LED driving control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7116089B1 (en) * | 2005-10-28 | 2006-10-03 | Monolithic Power Systems, Inc. | Constant-peak-current minimum-off-time pulse frequency modulator for switching regulators |
| CN101771404B (en) * | 2010-01-08 | 2016-01-20 | 深圳市中庆微科技开发有限公司 | A kind of LED control chip |
| CN103441658B (en) * | 2013-08-30 | 2016-05-04 | 深圳市汇顶科技股份有限公司 | A kind of Boost controller and Boost converter |
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| CN201550321U (en) * | 2009-09-28 | 2010-08-11 | 康佳集团股份有限公司 | LED driving control device |
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