CN104768263B - Adaptive LED booster driving circuit - Google Patents
Adaptive LED booster driving circuit Download PDFInfo
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- CN104768263B CN104768263B CN201410002146.XA CN201410002146A CN104768263B CN 104768263 B CN104768263 B CN 104768263B CN 201410002146 A CN201410002146 A CN 201410002146A CN 104768263 B CN104768263 B CN 104768263B
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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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- 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, the voltage of second divider resistance in automatic detection voltage feedback circuit, when the voltage of detection is less than preset voltage value, the booster driving circuit strobe pulse frequency modulating technology carries out boosting driving, when the voltage of detection is greater than the preset voltage value, the booster driving circuit strobe pulse width modulation technology carries out boosting driving；Also, the dim signal exported by light adjusting circuit, booster driving circuit export different voltage signals, and the size of current on major loop changes, and the brightness of LED light source changes.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.Also, the brightness regulation for realizing LED light source expands the application range of LED light source, convenient and practical.
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）It 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, including：
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, pressure feedback port and enable end, the power supply
End connects the power supply, and the output end connects 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；
Light adjusting circuit, the input terminal of the light adjusting circuit connect the power supply, and the output end of light adjusting circuit connects the liter
The enable end for pressing driving circuit, for providing dim signal to the booster driving circuit.
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 light adjusting circuit is the adjustable time base circuit of output signal in one of the embodiments,.
The institute that the time base circuit is constituted for ICM7555 chip with corresponding peripheral circuit in one of the embodiments,
State the adjustable time base circuit of output signal；
The discharge end of the ICM7555 chip is separately connected described by the first adjustable resistance and the second adjustable resistance
The power end and threshold value end of ICM7555 chip, the output end of the ICM7555 chip connect the enabled of the booster driving circuit
End；
By adjusting first adjustable resistance and the second adjustable resistance, the output end output of the ICM7555 chip is not
With the pulse width modulating signal of amplitude.
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, and 3 ends pin EN are as the enable end.
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 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, booster driving circuit strobe pulse are exported to scheme control end
Frequency modulating technology carries out boosting driving, when the voltage of detection is greater than first voltage preset value, exports to scheme control end high
Level, booster driving circuit strobe pulse width modulation technology carry out boosting driving；Also, the light modulation exported by light adjusting circuit
Signal, booster driving circuit export different voltage signals, and the size of current on major loop changes, and the brightness of LED light source changes.
By automatically selecting boosting driving method, which boosting driving method of selection can not be determined when payload size is indefinite by avoiding
The problem of being driven also saves the step of measuring light source resistance sizes, is easy to use and saves driving time.Also,
The brightness regulation for realizing LED light source expands the application range of LED light source, convenient and practical.
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, self adaptive control
Circuit 180 and light adjusting circuit 190.Above-mentioned inductor 120 connects the anode of power supply 200 and LED light source 300, power supply 200, inductance
Device 120 and LED light source 300 constitute major loop.Above-mentioned LED light source 300 is connected in series for series of LED, and LED light source 300
Cathode connect ground potential.Booster driving circuit 140 include power end A, output end B, pressure feedback port C, scheme control end D and
Enable end E, the power end A connection power supply 200 of booster driving circuit 140, output end B connection inductor 120 and LED light source 300
Common end.Voltage feedback circuit 160 includes the first divider resistance R1 and the second divider resistance R2, above-mentioned first divider resistance R1
It is above-mentioned with parallel connection LED light source 300, the pressure feedback port C connection of above-mentioned booster driving circuit 140 after the second divider resistance R2 series connection
The common end of first divider resistance R1 and the second divider resistance R2.Adaptation control circuit 180 includes signal input part and signal
Output end（It is not shown）, the above-mentioned partial pressure of first divider resistance R1 and second of the signal input part connection of adaptation control circuit 180
The common end of resistance R2, signal output end connect the scheme control end D of above-mentioned booster driving circuit 140；Adaptation control circuit
The voltage of 180 the second divider resistance R2 of detection, when the voltage detected is less than first voltage preset value, adaptation control circuit
180 export low level, 140 strobe pulse frequency modulating technology of booster driving circuit to scheme control end D by signal output end
Boosting driving is carried out, when the voltage detected is greater than above-mentioned first voltage preset value, exports high level to scheme control end D,
140 strobe pulse width modulation technology of booster driving circuit carries out boosting driving.The input terminal of above-mentioned light adjusting circuit 190 connects electricity
Source 200, the enable end E of the output end connection booster driving circuit 140 of light adjusting circuit 190, the tune exported by light adjusting circuit 190
Optical signal, the booster driving circuit 140 exports corresponding voltage, makes the current adjustment on major loop, thus LED light source 300
Brightness is adjustable.
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.By adjusting the input voltage of 140 enable end E of booster driving circuit, to adjust the electric current on major loop, realize
The brightness of LED light source 300 is adjustable to adapt to different application environments, convenient and practical, and has expanded above-mentioned LED light source 300
Application range.
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.
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 184 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 184 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.
Specifically, above-mentioned light adjusting circuit 190 is the adjustable time base circuit of output signal（It is not shown）, in the present embodiment,
Above-mentioned time base circuit can be the time base circuit that 555 series chip is constituted with corresponding peripheral circuit.Specifically, above-mentioned 555 chip
It can be ICM7555 chip.1 end pin GND of above-mentioned ICM7555 chip connects ground potential；2 ends pin TRIG are triggering end, are led to
Ground potential is connected after crossing connection capacitor C6；3 ends pin OUTPUT are output end, connect making for above-mentioned booster driving circuit 140
Energy end E, i.e. 3 ends pin EN of TPS61086；6 ends pin TH are threshold values end, and 7 pin DIS are discharge end, and 8 pin V+ are power supply
End, discharge end DIS are separately connected power end V+ and threshold values end TH, power supply by the first adjustable resistance R6 and the second adjustable resistance R7
Hold V+ connection power supply VCC.
Output end by adjusting the first adjustable resistance R6 and the second adjustable resistance R7, ICM7555 chip exports different width
The pulse width modulating signal of value, the enable end E of booster driving circuit 140 receive above-mentioned pulse width modulating signal and are put
It is output to major loop greatly, causes the electric current of major loop to generate variation so as to cause the corresponding change of 300 brightness of LED light source, realizes
The light modulation of LED light source 300.
Specifically, the operating voltage of above-mentioned ICM7555 is 2-18V.Wherein, above-mentioned dim signal is pulse width modulation letter
Number.The frequency of dim signal is calculated by following formula：Wherein RA、RBRespectively the first adjustable resistance
The resistance value of R6 and the second adjustable resistance R7, C are the capacitor of capacitor C6 shown in Fig. 2.Wherein, duty ratio calculation formula is：As can be seen that can be carried out as long as the resistance for adjusting the first adjustable resistance R6 or the second adjustable resistance R7
Light modulation.
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 at the public end of the first divider resistance R1 and the second divider resistance R2, that is, FB pin is
The maximum value of VS, VS are no more than 18.5V.Specifically, above-mentioned first divider resistance R1, the second divider resistance R2 resistance value size
Calculation formula be：Wherein VFB=1.238V is feedback regulation electricity
Pressure is second voltage preset value.When voltage on FB pin is less than above-mentioned second voltage preset value, booster driving circuit 140 is
TPS61086 chip increases the output voltage of output end, realizes under-voltage protection；When the voltage on FB pin is greater than above-mentioned second electricity
When pressing preset value, booster driving circuit 140 is that TPS61086 chip closes output, realizes overvoltage protection.Specifically, in another reality
It applies in example, when the voltage of FB pin is higher than normal value（That is 1.238V）3% when, TPS61086 chip can close output, until
The voltage of FB pin restores to work normally when returning to normal value, i.e., above-mentioned second voltage preset value is 1.238*（1+3%）V.Into one
Step, maloperation when in order to prevent under-voltage, when the voltage of power supply VCC is lower than 2.2V, above-mentioned booster driving circuit 140,
It is TPS61086 chip in the present embodiment, output can be closed, 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 current-limiting resistance R4 is in order in the voltage-stabiliser tube ZD when progress that is reversed breakdown
Current limliting.In other examples, above-mentioned light source protection circuit 170 can also above-mentioned LED light source 300 directly in parallel, in major loop
LED light source 300 is protected when output overvoltage.
3 pin EN pins of TPS61086 chip are the enable end of TPS61086 chip（I.e. above-mentioned booster driving circuit 140
Enable end E, with reference to Fig. 1）, connect the output end of above-mentioned light adjusting circuit 190, i.e. 3 ends pin OUTPUT of ICM7555 chip
（With reference to Fig. 2）, when ICM7555 chip exports high level, TPS61086 chip is started to work, and ICM7555 chip is exported
Corresponding voltage signal amplifies.When the peripheral circuit for adjusting above-mentioned ICM7555 chip adjust the first adjustable resistance R6 and
When the second adjustable resistance R7, the amplitude of the signal magnitude of ICM7555 chip output can generate variation, corresponding TPS61086 chip
The voltage signal size of output can also generate corresponding variation, to adjust the brightness of 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, output end as TPS61086 chip after above-mentioned 6 pin, the connection of 7 pins（It is i.e. above-mentioned
The output end B of booster driving circuit 140, with reference to Fig. 1）, above-mentioned TPS61086 chip output end connection major loop in inductor L
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 are the power end of TPS61086 chip（I.e. above-mentioned booster driving circuit 140
Power end A, with reference to Fig. 1）, connect power supply VCC（That is power supply 200, 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 C4.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 the scheme control end of TPS61086 chip（I.e. above-mentioned boosting driving electricity
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 pin 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, and C5 is in parallel
LED light source 300.
Unidirectional conducting switch is additionally provided on the major loop that above-mentioned inductor L and LED light source 300 are constituted（Figure is not marked）, single
Guide, which opens up to close, is separately connected the anode of inductor L and LED light source 300, for preventing the charge of above-mentioned capacitor C5 cannot be to
The output end B of above-mentioned inductor L and booster driving circuit 140 reflux.Specifically, above-mentioned unidirectional conducting switch is one-way conduction two
Pole pipe D.
When the end IN of TPS61086 chip is powered, enable end EN connection high level, the switching tube in TPS61086 chip is opened
It opens, for the electric current of power supply VCC input through inductor L, the end SW, the end PGND of TPS61086 chip constitute circuit, during this period, inductance
Device L storage energy, LED light source 300 are powered by capacitor C5 entirely.When the switching tube of TPS61086 chip is closed, due to anti-electricity
The energy of the effect of gesture, inductor L storage is powered through one-way conduction diode D to capacitor C5 and LED light source 300.Due to list
The charge of presence to conducting diode D, capacitor C5 cannot flow back to the end SW of inductor L or TPS61086 chip.
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 ICM7555 chip exports low level, TPS61086 chip
Interior switching tube is opened, and TPS61086 chip does not work；When ICM7555 chip exports high level, the 3 of TPS61086 chip are drawn
Foot enable end EN accesses 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, that is, feedback regulation voltage 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.
When adjusting the size of peripheral circuit the first adjustable resistance R6 and the second adjustable resistance R7 of ICM7555 chip,
ICM7555 chip exports the PWM square-wave signal of respective magnitudes, so that TPS61086 chip rises the voltage signal received
Pressure, exports corresponding voltage signal to major loop, to adjust the brightness of LED light source 300.
It is grounded after 1 end pin COMP series resistance R5 and capacitor C1 of TPS61086 chip, load transient can be improved
Responding ability.
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
Current-limiting resistance R4, it is above-mentioned for when causing major loop output overvoltage, being protected to LED light source 300 in circuit failure
Current-limiting resistance 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, which is characterized in that including：
The cathode of the anode of inductor, power supply and LED light source, the LED light source connects ground potential；The power supply, inductor and
LED light source constitutes major loop；
Booster driving circuit, including power end, output end, scheme control end, pressure feedback port and enable end, the power end connect
The power supply is connect, the output end connects 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；
Light adjusting circuit, the input terminal of the light adjusting circuit connect the power supply, and the output end of light adjusting circuit connects the boosting and drives
The enable end of dynamic circuit, for providing dim signal to the booster driving circuit.
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 light adjusting circuit is output
The adjustable time base circuit of signal.
7. adaptive LED booster driving circuit according to claim 6, which is characterized in that the time base circuit is
The adjustable time base circuit of the output signal that ICM7555 chip is constituted with corresponding peripheral circuit；
The discharge end of the ICM7555 chip is separately connected the ICM7555 by the first adjustable resistance and the second adjustable resistance
The output end of the power end and threshold value end of chip, the ICM7555 chip connects the enable end of the booster driving circuit；
By adjusting first adjustable resistance and the second adjustable resistance, the output end of the ICM7555 chip exports different width
The pulse width modulating signal of value.
8. 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, 3 pins
The end EN is as the enable end.
9. 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.
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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| CN201410002146.XA CN104768263B (en) | 2014-01-02 | 2014-01-02 | Adaptive LED booster driving circuit |
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| CN201410002146.XA CN104768263B (en) | 2014-01-02 | 2014-01-02 | Adaptive LED booster driving circuit |
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| CN104768263B true CN104768263B (en) | 2018-11-27 |
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| JP7101667B2 (en) * | 2016-10-21 | 2022-07-15 | シグニファイ ホールディング ビー ヴィ | Current Modulation Circuits, Drive Circuits, and Methods for Driving Illumination Loads Using Current Modulation |
| CN108122530A (en) * | 2016-11-28 | 2018-06-05 | 昆山国显光电有限公司 | The call method and display screen of power supply chip and its PWM, PFM |
| TWI641225B (en) * | 2018-05-03 | 2018-11-11 | 廣達電腦股份有限公司 | Voltage band-pass enable circuit |
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