CN104768257A - Adaptive LED boost driving circuit - Google Patents
Adaptive LED boost driving circuit Download PDFInfo
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- CN104768257A CN104768257A CN201410002134.7A CN201410002134A CN104768257A CN 104768257 A CN104768257 A CN 104768257A CN 201410002134 A CN201410002134 A CN 201410002134A CN 104768257 A CN104768257 A CN 104768257A
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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 an adaptive LED boost driving circuit. An adaptive control circuit automatically detects the current flowing through an LED light source so as to automatically control the boost driving circuit to select a corresponding boost driving mode to carry out boost driving. When the detected current is smaller than a preset current value, low level is output to a mode control end, and the boost driving circuit selects a pulse frequency modulation technology to carry out boost driving. When the detected current is greater than the preset current value, high level is output to the mode control end, and the boost driving circuit selects a pulse width modulation technology to carry out boost driving. Through automatic boost driving mode selection, the problem that which boost driving mode is selected for driving cannot be determined when the load size is not clear is avoided, the step of measuring the resistance of the light source is omitted, the circuit is convenient to use, and the driving time is saved.
Description
Technical field
The present invention relates to lighting technical field, particularly relate to a kind of adaptive LED booster driving circuit.
Background technology
Light-emitting diode (Light-Emitting Diode, LED) is a kind of semiconductor electronic component that can be luminous.The diode be made up of the compound of gallium and arsenic, phosphorus, can give off visible ray when electronics and hole-recombination, thus can be used for making light-emitting diode.As indicator light in circuit and instrument, or form word or numerical monitor.Along with the continuous progress of technology, light-emitting diode has been widely used in display, television set daylighting decoration and illumination.
The power supply circuits of tradition LED are all storage battery power supplies, need booster circuit to drive.Traditional booster driving circuit comprises pulse width modulating technology and pulse frequency modulated technology, when carrying out boosting and driving, drives, drive for large LED load strobe pulse width modulation technology for little LED load strobe pulse frequency modulating technology.
But, for the indefinite situation of load, cannot determine to select which boosting type of drive to drive, need first to determine that load selects drive circuit again, comparatively bother.
Summary of the invention
Based on this, be necessary first to determine that load carries out the problem driven of boosting again for load indefinite needs, provide a kind of needs to determine that load directly can carry out the adaptive LED booster driving circuit driven.
A kind of adaptive LED booster driving circuit, comprising:
Inductor, connects the positive pole of power supply and LED light source, and the negative pole of described LED light source connects earth potential; Described light source, inductor and LED light source form major loop;
Booster driving circuit, comprise power end, output and Schema control end, described power end connects described power supply, and described output connects the common port of described inductor and described LED light source;
Adaptation control circuit, comprises signal input part and signal output part, and described signal input part connects the common port of described inductor and LED light source, for detecting the electric current of described major loop; Described signal output part connects described Schema control end, when the electric current detected is less than pre-set current value, to described Schema control end output low level, described booster driving circuit strobe pulse frequency modulating technology carries out boosting and drives, when the electric current detected is greater than described pre-set current value, export high level to described Schema control end, described booster driving circuit strobe pulse width modulation technology carries out boosting and drives.
Wherein in an embodiment, described adaptation control circuit comprises the current-limiting resistance of series connection, analog-to-digital conversion module, single-chip microcomputer and pull down resistor, described current-limiting resistance is connected described inductor with the common port of analog-to-digital conversion module, the other end of described current-limiting resistance connects described LED light source, described pull down resistor is connected described Schema control end with the common port of described single-chip microcomputer, the other end ground connection of described pull down resistor.
Wherein in an embodiment, described adaptation control circuit also comprises filtration module, and described filtration module connects the input end of described analog-to-digital conversion module.
Wherein in an embodiment, described pre-set current value is 100mA.
Wherein in an embodiment, described booster driving circuit also comprises Enable Pin, and described Enable Pin connects described power supply by touch switch, and described touch switch closes, and described Enable Pin connects high level, and described booster driving circuit is started working; Described touch switch disconnects, and described Enable Pin is unsettled, and described booster driving circuit quits work.
Wherein in an embodiment, described booster driving circuit is TPS61086 chip, 8 pin IN of described TPS61086 chip hold as described power end, and as described output after 6 pin SW ends, 7 pin SW hold and connect, 9 pin MODE hold as described Schema control end.
Wherein in an embodiment, when the working temperature of described booster driving circuit exceedes preset temperature, described booster driving circuit is closed automatically.
Wherein in an embodiment, described adaptive LED booster driving circuit also comprises filtering capacitor, described filtering capacitor described LED light source in parallel.
Wherein in an embodiment, described adaptive LED booster driving circuit also comprises unidirectional conducting switch, and described unidirectional conducting switch connects the positive pole of described inductor and described LED light source respectively.
Wherein in an embodiment, described adaptive LED booster driving circuit also comprises filter circuit, and described filter circuit connects the power end of described booster driving circuit.
Above-mentioned adaptive LED booster driving circuit, automatically the electric current flowing through LED light source is detected by adaptation control circuit, thus the automatic booster driving circuit that controls selects corresponding boosting type of drive to carry out boosting driving, when the electric current detected is less than pre-set current value, to described Schema control end output low level, described booster driving circuit strobe pulse frequency modulating technology carries out boosting and drives, when the electric current detected is greater than described pre-set current value, high level is exported to described Schema control end, described booster driving circuit strobe pulse width modulation technology carries out boosting and drives.By automatically selecting type of drive of boosting, avoiding and cannot to determine when load is indefinite to select which boosting type of drive to carry out the problem driven, also saving the step of measurement light source resistance sizes, easy to use and save driving time.
Accompanying drawing explanation
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.
Embodiment
A kind of adaptive LED booster driving circuit, by automatically detecting the size of current of the LED light source of place in circuit, and automatically select to carry out the circuit driven that boosts according to size of current, avoid in the indefinite situation of load, which cannot determine to select boosting type of drive to carry out the problem driven, also save the step of measurement light source resistance sizes, easy to use and save driving time.Further, above-mentioned adaptive LED booster driving circuit, uses TPS61-86 chip, realizes overvoltage, under-voltage and overheat protective function.Further, the function of above-mentioned adaptive LED booster driving circuit by using light adjusting circuit to achieve dimming light source and Bright Source Protection.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Shown in Fig. 1, it is the adaptive LED booster driving circuit schematic diagram of one embodiment of the invention.With reference to figure 1, a kind of adaptive LED booster driving circuit, comprises inductor 120, booster driving circuit 140 and adaptation control circuit 160.Above-mentioned inductor 120 connects the positive pole of power supply 200 and LED light source 300, and power supply 200, inductor 120 and LED light source 300 form major loop.Above-mentioned LED light source 300 is in series for series of LED, and the negative pole of LED light source 300 connects earth potential.Booster driving circuit 140 comprises power end A, output B, Schema control end C, and the power end A of booster driving circuit 140 connects power supply 200, and output B connects the common port of inductor 120 and LED light source 300.Adaptation control circuit 160 comprises signal input part and signal output part (not shown), the signal input part of adaptation control circuit 160 connects the common port of inductor 120 and LED light source 300, for detecting the electric current of above-mentioned major loop, signal output part connects above-mentioned Schema control end C.Adaptation control circuit 160 detects the electric current of major loop, when the electric current detected is less than pre-set current value, to Schema control end C output low level, booster driving circuit 140 strobe pulse frequency modulating technology carries out boosting and drives, when the electric current detected is greater than above-mentioned pre-set current value, export high level to Schema control end C, booster driving circuit 140 strobe pulse width modulation technology carries out boosting and drives.
By automatically selecting type of drive of boosting, avoid in the indefinite situation of the load of LED light source 300, cannot determine to select which boosting type of drive to carry out the problem driven, also save the step of the resistance sizes measuring LED light source 300, easy to use and save driving time.
Traditional LED illumination drives and uses switching circuit, this circuit itself low in energy consumption, and drive efficiency is high.The type of switching circuit probably can be divided into pulse width modulation (Pulse Width Modulation, PWM) and pulse frequency modulated (Pulse frequency modulation, PFM).During wherein PWM is mainly used in, heavy-loaded circuit, PFM is mainly used in underload circuit.PWM technology is the wide and narrow change of frequency, and PFM technology is the change of having of frequency and nothing, and PWM technology utilizes square-wave pulse width to control to export, and PFM technology utilizes the presence or absence of pulse to control to export.PWM technology is with the difference of PFM technology: for the PFM technology the same for peripheral circuit and PWM technology, when reaching its peak efficiencies, the efficiency of PFM technology and PWM technology is suitable, but before peak efficiencies, the efficiency far of PFM technology is higher than the efficiency of PWM technology, this is the main advantage of PFM technology, is also that PFM technology is applicable to underload, PWM technology is applicable to heavy duty reason; PWM technology is due to the impact of error amplifier, and loop gain and response speed are restricted, and PFM technology has response speed faster, and PWM technology is fixing in whole work period frequency, and PFM technology is not.Therefore, PFM technology compare PWM technology major defect be filtering difficulty; PFM technical controlling compares that PWM technical controlling IC price is expensive, and PWM Control Technique implements easily, and PFM control method implements not too easy, so in practical application, common is greatly that PWM controls, and rare PFM controls.
Further, above-mentioned booster driving circuit 140 also comprises Enable Pin (not shown).Above-mentioned Enable Pin passes through touch switch 180(with reference to figure 2) connect power supply 200, touch switch 180 closes, and Enable Pin connects high level, and booster driving circuit 140 is started working; Touch switch 180 disconnects, and Enable Pin is unsettled, and booster driving circuit 140 quits work.
Shown in Fig. 2, it is the adaptive LED booster driving circuit schematic diagram of another embodiment of the present invention.
With reference to figure 2, above-mentioned adaptation control circuit 160 comprises the current-limiting resistance R1 of series connection, analog-to-digital conversion module 164, single-chip microcomputer 166 and pull down resistor R2.Above-mentioned current-limiting resistance R1 is connected inductor 120 with the common port of analog-to-digital conversion module 164, and the other end of current-limiting resistance R1 connects LED light source 300; For analog-to-digital conversion module 164, the one end connecting the common port of above-mentioned inductor 120 and current-limiting resistance R1 is the input end of analog-to-digital conversion module 164, is also the signal input part of above-mentioned adaptation control circuit 160; Pull down resistor R2 is connected the Schema control end C of booster driving circuit 140 with the common port of single-chip microcomputer 166, the other end ground connection of pull down resistor R2; For adaptation control circuit 160, the one end connecting above-mentioned Schema control end C is the signal output part of above-mentioned adaptation control circuit 160.
Above-mentioned current-limiting resistance R1 is small resistor, in foregoing circuit, for distributing less voltage, above-mentioned analog-to-digital conversion module 164 detects the current analog signal that flows through on above-mentioned current-limiting resistance R1 and converts above-mentioned current analog signal to voltage digital signal and be transferred to above-mentioned single-chip microcomputer 166, above-mentioned single-chip microcomputer 166 calculates the electric current flowing through LED light source 300 by above-mentioned voltage digital signal, and carry out judging and controlling: if above-mentioned size of current is more than 100mA, represent that the load of LED light source 300 is comparatively large, single-chip microcomputer 166 exports high level to Schema control end C; If above-mentioned electric current is less than 100mA, represent that LED light source 300 load is less, single-chip microcomputer 166 output low level is to Schema control end C.Concrete, in the present embodiment, when the load of above-mentioned LED light source 300 is larger, the electric current on major loop is greater than 100mA, but maximumly may not exceed 2A.As mentioned above, above-mentioned pre-set current value is 100mA.In other examples, above-mentioned pre-set current value also can be other values, according to concrete drive circuit need setting.
The i.e. AD conversion chip of above-mentioned analog-to-digital conversion module 164, carries out AD detection by above-mentioned analog-to-digital conversion module 164.In other embodiments, above-mentioned single-chip microcomputer 166 also can built-in analog-to-digital conversion module.
Further, with reference to figure 2, above-mentioned adaptation control circuit 160 also comprises filtration module 168, and filtration module 168 connects the input end of above-mentioned analog-to-digital conversion module 164, the Wen Bo on the major loop that filtering inductor 120 and LED light source 300 are formed, electromagnetic wave or other fluctuations.Concrete, above-mentioned filtration module 168 is low-pass filter circuit, one of high-pass filtering circuit or bandwidth-limited circuit, or for combining the compound filter circuit of above-mentioned filter circuit.In other examples, above-mentioned filtration module 168 also can be filtering chip.
With reference to figure 2, above-mentioned booster driving circuit 140 is specially TPS61086 chip.
1 pin COMP of TPS61086 chip holds as compensating end, by ground connection after series resistance R3 and capacitor C1, can improve load transient response ability.Concrete, above-mentioned resistance R3 resistance is 16k Ω, and the electric capacity of capacitor is 2.7nF.
2 pin FB of TPS61086 chip hold as pressure feedback port, and connect the common port of resistance R4 and the R5 of series connection, resistance R4 and R5 connects inductor L and earth potential after connecting respectively.TPS61086 chip and resistance R4, R5 form output voltage feedback circuit, control the output voltage size of above-mentioned main circuit.When the voltage of the pressure feedback port of TPS61086 chip is less than voltage preset value, TPS61086 chip increases output voltage; When the voltage of the pressure feedback port of TPS61086 chip is greater than above-mentioned voltage preset value, TPS61086 chip quits work.
If the maximum occurrences that the voltage on the output voltage of the common port of resistance R4 and R5 and FB pin is VS, VS can not more than 18.5V.Concrete, the computing formula of above-mentioned resistance R4, resistance R5 resistance size is:
wherein V
fB=1.238V is feedback regulation voltage.When voltage on FB end is less than this feedback regulation magnitude of voltage, TPS61086 chip increases output voltage, realizes under-voltage protection; When the voltage on FB end is greater than this feedback regulation magnitude of voltage, TPS61086 chip is closed and is exported, and realizes overvoltage protection.Concrete, in another embodiment, when FB pin voltage higher than feedback regulation voltage normal value (1.238V) 3% time, TPS61086 chip can close output, until recover normal work when the voltage of FB pin gets back to normal value.Further, misoperation during in order to prevent under-voltage, when the voltage of power supply VCC is lower than 2.2V, above-mentioned booster driving circuit 140, is TPS61086 chip in the present embodiment, can closes output, further ensures the stability that circuit integrity runs.
Further, with reference to figure 2, above-mentioned adaptive LED booster driving circuit also comprises light source protection circuit 190; above-mentioned light source protection circuit 190 above-mentioned resistance R4 in parallel; for breaking down at circuit, when causing major loop output overvoltage, LED light source 300 is protected.Concrete, above-mentioned light source protection circuit 190 can be voltage-stabiliser tube ZD and the current-limiting resistance R6 of series connection.Wherein, above-mentioned voltage-stabiliser tube ZD can be 15V, and above-mentioned resistance R6 is to carry out current limliting when being reversed puncturing at voltage-stabiliser tube ZD.In other examples, above-mentioned light source protection circuit 190 also can above-mentioned resistance R4 and R5 in parallel or above-mentioned LED light source 300 in parallel, protects LED light source 300 when major loop output overvoltage.
3 pin EN of TPS61086 chip hold the Enable Pin for TPS61086 chip, the i.e. Enable Pin of above-mentioned booster driving circuit 140, power supply 200 is connected by connecting button K, when button K closes, Enable Pin EN holds input high level, TPS61086 chip energising unlatching work, on the contrary, when button K disconnects, Enable Pin EN is unsettled, and TPS61086 chip dead electricity quits work.In other examples, above-mentioned touch switch 180 also can be the common touch switch outside button K.
In another embodiment, above-mentioned Enable Pin EN also can connect time-base circuit (not shown), and provides enable signal by above-mentioned time-base circuit.The exportable PWM square-wave signal of above-mentioned time-base circuit, and by arranging the peripheral circuit of above-mentioned time-base circuit, regulate the size of said PWM square-wave signal amplitude, thus realize carrying out light modulation to LED light source 300.
4 pins of TPS61086 chip, 5 pins and AGND end and PGND end, connect earth potential respectively.6 pins of TPS61086 chip, 7 pins are respectively SW end, as output (the i.e. output B of above-mentioned booster driving circuit 140 of TPS61086 chip after above-mentioned 6 pins, 7 pins connect, with reference to figure 1), the output of above-mentioned TPS61086 chip connects the common port of inductor L and LED light source 300 in major loop.TPS61086 chip exports to above-mentioned major loop, with driving LED light source 300 after being amplified by the voltage signal that Enable Pin EN inputs.
Concrete, the inductance size of above-mentioned inductor L is 3.3uH-5uH, and computing formula is as follows: L=(V
iN/ Vs)
2* ((V
s-V
iN)/(I
oUT* f
s)) * (η/0.35).Wherein V
iNfor the input voltage of inductor L, I
oUTfor the output current of inductor L, η is circuit efficiency, and in the present embodiment, foregoing circuit efficiency specifically can be 90%; f
sfor the operating frequency of the switching tube of TPS61086 chip, f in the present embodiment
sfor fixed frequency 1.2MHz.
8 pin IN of TPS61086 chip hold power end (the i.e. power end A of above-mentioned booster driving circuit 140 for TPS61086 chip, with reference to figure 1), connect power supply VCC(and power supply 200, with reference to figure 1), power supply VCC is storage battery in the present embodiment, and general output voltage is 2.3V-6V.
Further, above-mentioned adaptive LED booster driving circuit also comprises filter circuit 170, connects the power end IN of TPS61086 chip, for carrying out High frequency filter to the power supply signal of input supply terminal IN.Concrete, above-mentioned filter circuit 170 is ceramic disc capacitor C4.Further, above-mentioned adaptive LED booster driving circuit also comprises electric source filter circuit 150, is connected to power supply VCC output, carries out low frequency filtering for the power supply signal exported power supply VCC.Concrete, above-mentioned electric source filter circuit 150 is electrochemical capacitor C4.
9 pin MODE of TPS61086 chip hold Schema control end (the i.e. Schema control end C of above-mentioned booster driving circuit 140 for TPS61086 chip, with reference to figure 1), during above-mentioned Schema control end MODE input high level, TPS61086 chip uses PWM technology to carry out boosting and drives, during above-mentioned Schema control end pin input low level, TPS61086 chip uses PFM technology to carry out boosting and drives.Shown in Fig. 2, above-mentioned Schema control end MODE connects the common port of above-mentioned single-chip microcomputer 166 and pull down resistor R2, and when single-chip microcomputer 166 exports high level, TPS61086 chip uses PWM technology to carry out boosting and drives; During single-chip microcomputer 166 output low level, TPS61086 chip uses PFM technology to carry out boosting and drives.
10 pin SS pins of TPS61086 chip are soft start pin, and after capacitor C2 ground connection, TPS61086 chip will carry out soft start, can prevent the interference of surge current.The electric capacity of usual above-mentioned capacitor C2 is 100nF, when above-mentioned adaptive LED booster driving circuit energising, when Enable Pin EN end detects high level, capacitor C2 is charged to 0.3V at once, then the current charges with 10uA is continued, until output voltage reaches 90% of rated value.When circuit closes input, capacitor C2 discharges over the ground.The capacitance of capacitor C2 is larger, and Anti-surging ability is stronger.
Further, when the working temperature of above-mentioned booster driving circuit 140 exceedes preset temperature, booster driving circuit 140 is closed automatically.In the embodiment depicted in figure 2, when the working temperature of TPS61086 chip exceedes preset temperature, the switching tube in TPS61086 chip disconnects automatically, and TPS61086 chip quits work.Concrete, above-mentioned preset temperature is 150 DEG C.The working temperature that above-mentioned TPS61086 chip allows is within 136 DEG C, and when working temperature reaches 150 DEG C, TPS61086 chip quits work automatically, until when the temperature of circuit is lower than 136 DEG C, TPS61086 chip recovers normal work.
Further, with reference to figure 2, above-mentioned adaptive LED booster driving circuit also comprises filtering capacitor C5, filtering capacitor C5 parallel connection LED light source 300.
Further, the major loop that above-mentioned inductor L and LED light source 300 are formed also is provided with unidirectional conducting switch (figure does not mark), unidirectional conducting switch connects the positive pole of inductor L and LED light source 300 respectively, refluxes to the output B of above-mentioned inductor L and booster driving circuit 140 for preventing the electric charge of above-mentioned capacitor C5.Concrete, above-mentioned unidirectional conducting switch is one-way conduction diode D.
When the power end IN of TPS61086 chip is energized, Enable Pin EN connects high level, and the switching tube in TPS61086 chip is opened, and the electric current that power supply VCC inputs holds through the SW of inductor L, TPS61086 chip and PGND end forms loop.During this period, inductor L stored energy, 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 that inductor L stores is powered to capacitor C5 and LED light source 300 through one-way conduction diode D.Due to the existence of one-way conduction diode D, the electric charge of capacitor C5 can not reflux to the SW end of inductor L or TPS61086 chip.
Below in conjunction with the principle of circuit embodiment illustrated in fig. 2, the principle of adaptive LED booster driving circuit of the present invention is described in more detail.
Power supply VCC exports the voltage of 2.3V-6V, the major loop that a road is formed through inductor L, one-way conduction diode D, current-limiting resistance R1 and LED light source 300, the wherein minus earth of LED light source 300.
Low-pass filtering, electric capacity C4 are input to TPS61086 chip 8 pin power end IN after carrying out high-pass filtering are carried out, for TPS61086 chip provides operating voltage through electric capacity C3 in one tunnel.When button K disconnects, 3 pin enabled end EN of TPS61086 chip are unsettled, and the switching tube in TPS61086 chip is opened, and TPS61086 chip does not work; When button K closes, 3 pin enabled end EN of TPS61086 chip access high level, and the switching tube in TPS61086 chip closes, TPS61086 chip unlatching work.
During the switching tube of TPS61086 chip is opened, the electric current that power supply VCC exports is held through the SW of inductor L, TPS61086 chip, PGND end forms loop, and during this period, inductor L storage power, LED light source 300 is powered by electric capacity C5 entirely.When the switching tube of TPS61086 chip is closed, due to the effect of back-emf, the energy that inductor L stores is powered to electric capacity C5 and LED light source 300 through one-way conduction diode D.Due to the existence of one-way conduction diode D, the electric charge of electric capacity C5 can not reflux to the SW end of inductor L or TPS61086 chip.
Adaptation control circuit 160 detects size major loop flowing through current-limiting resistance R1 electric current, after filtration module 168 filtering, analog-to-digital conversion module 164 converts the current analog signal detected to voltage digital signal and is transferred to single-chip microcomputer 166, single-chip microcomputer 166 calculates the size of current flowing through major loop by above-mentioned voltage digital signal, and carry out judging and controlling: if above-mentioned size of current is more than 100mA, represent that the load of LED light source 300 is comparatively large, single-chip microcomputer 166 exports high level to the Schema control end MODE of TPS61086 chip; If above-mentioned electric current is less than 100mA, represent that LED light source 300 load is less, single-chip microcomputer 166 output low level is to the Schema control end MODE of TPS61086 chip.
When the Schema control end MODE of TPS61086 chip receives high level, TPS61086 chip uses PWM technology to carry out boosting and drives, and when Schema control end MODE receives low level, TPS61086 chip uses PFM technology to carry out boosting and drives.
Ground connection after 1 pin COMP end series resistance R3 and capacitor C1 of TPS61086 chip, can improve load transient response ability.
2 pin FB of TPS61086 chip hold the common port of resistance R4 and the R5 connecting series connection, and resistance R4 and R5 connects output and the earth potential of one-way conduction diode D respectively after connecting, for carrying out Voltage Feedback.When the voltage of FB end is less than feedback regulation voltage, TPS61086 chip increases output voltage, realizes under-voltage protection; When the voltage on FB pin is greater than this feedback regulation magnitude of voltage, TPS61086 chip is closed and is exported, and realizes overvoltage protection.In embodiment illustrated in fig. 2, above-mentioned feedback regulation voltage is 1.238V.
Above-mentioned resistance R4 two ends parallel connection LED light source 300 protective circuit; comprise voltage-stabiliser tube ZD and the resistance R6 of series connection, for breaking down at circuit, when causing major loop output overvoltage; protect LED light source 300, above-mentioned resistance R6 is to carry out current limliting when being reversed puncturing at voltage-stabiliser tube ZD.
4 pins of TPS61086 chip, 5 pins and AGND end and PGND end, connect earth potential respectively.10 pin SS pins of TPS61086 chip are soft start pin, and after electric capacity C2 ground connection, TPS61086 chip will carry out soft start, can prevent the interference of surge current.
Further, when the working temperature of above-mentioned TPS61086 chip is higher than 150 DEG C, TPS61086 chip quits work automatically, until when the temperature of circuit is lower than 136 DEG C, TPS61086 chip recovers normal work.
To sum up, above-mentioned adaptive LED booster driving circuit is by automatically detecting main circuit current size thus automatically selecting corresponding boosting type of drive to drive, simple and convenient; And overheated, overvoltage, under-voltage protection can be realized, make circuit more safe and reliable.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. an adaptive LED booster driving circuit, is characterized in that, comprising:
Inductor, connects the positive pole of power supply and LED light source, and the negative pole of described LED light source connects earth potential; Described light source, inductor and LED light source form major loop;
Booster driving circuit, comprise power end, output and Schema control end, described power end connects described power supply, and described output connects the common port of described inductor and described LED light source;
Adaptation control circuit, comprises signal input part and signal output part, and described signal input part connects the common port of described inductor and LED light source, for detecting the electric current of described major loop; Described signal output part connects described Schema control end, when the electric current detected is less than pre-set current value, to described Schema control end output low level, described booster driving circuit strobe pulse frequency modulating technology carries out boosting and drives, when the electric current detected is greater than described pre-set current value, export high level to described Schema control end, described booster driving circuit strobe pulse width modulation technology carries out boosting and drives.
2. adaptive LED booster driving circuit according to claim 1, it is characterized in that, described adaptation control circuit comprises the current-limiting resistance of series connection, analog-to-digital conversion module, single-chip microcomputer and pull down resistor, described current-limiting resistance is connected described inductor with the common port of analog-to-digital conversion module, the other end of described current-limiting resistance connects described LED light source, described pull down resistor is connected described Schema control end with the common port of described single-chip microcomputer, the other end ground connection of described pull down resistor.
3. adaptive LED booster driving circuit according to claim 2, is characterized in that, described adaptation control circuit also comprises filtration module, and described filtration module connects the input end of described analog-to-digital conversion module.
4. adaptive LED booster driving circuit according to claim 1, is characterized in that, described pre-set current value is 100mA.
5. adaptive LED booster driving circuit according to claim 1, it is characterized in that, described booster driving circuit also comprises Enable Pin, described Enable Pin connects described power supply by touch switch, described touch switch closes, described Enable Pin connects high level, and described booster driving circuit is started working; Described touch switch disconnects, and described Enable Pin is unsettled, and described booster driving circuit quits work.
6. adaptive LED booster driving circuit according to claim 1, it is characterized in that, described booster driving circuit is TPS61086 chip, 8 pin IN of described TPS61086 chip hold as described power end, as described output after 6 pin SW ends, 7 pin SW hold and connect, 9 pin MODE hold as described Schema control end.
7. adaptive LED booster driving circuit according to claim 6, is characterized in that, when the working temperature of described booster driving circuit exceedes preset temperature, described booster driving circuit is closed automatically.
8. adaptive LED booster driving circuit according to claim 1, is characterized in that, described adaptive LED booster driving circuit also comprises filtering capacitor, described filtering capacitor described LED light source in parallel.
9. adaptive LED booster driving circuit according to claim 1, is characterized in that, described adaptive LED booster driving circuit also comprises unidirectional conducting switch, and described unidirectional conducting switch connects the positive pole of described inductor and described LED light source respectively.
10. adaptive LED booster driving circuit according to claim 1, is characterized in that, described adaptive LED booster driving circuit also comprises filter circuit, and described filter circuit connects the power end of described booster driving circuit.
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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 |
| CN103441658A (en) * | 2013-08-30 | 2013-12-11 | 深圳市汇顶科技股份有限公司 | Boost controller and Boost converter |
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2014
- 2014-01-02 CN CN201410002134.7A patent/CN104768257A/en active Pending
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| US7116089B1 (en) * | 2005-10-28 | 2006-10-03 | Monolithic Power Systems, Inc. | Constant-peak-current minimum-off-time pulse frequency modulator for switching regulators |
| CN101034851A (en) * | 2005-10-28 | 2007-09-12 | 美国芯源系统股份有限公司 | Method and device for controlling switching regulators |
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