CN106954299A - A kind of high-power LED driving power source - Google Patents
A kind of high-power LED driving power source Download PDFInfo
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- CN106954299A CN106954299A CN201710111334.XA CN201710111334A CN106954299A CN 106954299 A CN106954299 A CN 106954299A CN 201710111334 A CN201710111334 A CN 201710111334A CN 106954299 A CN106954299 A CN 106954299A
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The invention provides a kind of high-power LED driving power source, including main circuit and control circuit；Input rectification filtering unit that main circuit includes being sequentially connected, up and down switching tube, capacitance, transformer and output end rectification filtering unit；Wherein, input rectification filtering unit is single capacitor half-bridge structure, the source electrode of the drain electrode of upper switch transistor T 1 and lower switch transistor T 2 connects the output end of input rectification filtering unit respectively, capacitance Cb is located between lower switch transistor T 2 and transformer T primary side, and output end rectification filtering unit is the full-wave rectifying circuit of connection transformer T secondary sides；Controlling circuit includes PWM generation circuits, drive circuit and loop compensation circuit.The LED drive power of the present invention, without high-power electrochemical capacitor, long lifespan, small volume, output stabilization, driving effect are good, it is adaptable to the driving of high-power LED light source, with good practicality and market prospects.
Description
Technical field
The present invention relates to LED technology field, and in particular to a kind of high-power LED driving power source.
Background technology
LED has energy-saving and environmental protection, long lifespan, rich color etc. as a kind of new light sources compared with original lighting source
Advantage, its various advantage having promote the development in LED markets.During using LED illumination, it is desirable to have supporting driving power supply is come
Drive LED.LED drive power in the market contains electrochemical capacitor mostly, limits the life-span advantage of LED light source.Meanwhile,
Existing LED drive power, only tens watts mostly of its power, it is impossible to meet the place such as factory, square needs great power LED light
The demand in source.Accordingly, it would be desirable to develop a kind of high-power LED driving power source of no electrolytic capacitor to meet the demand.
The content of the invention
Present invention solves the technical problem that being to provide a kind of high-power LED driving power source of no electrolytic capacitor, to meet
Need the demand in the place of high-power LED illuminating light source.
In order to solve the above-mentioned technical problem, present invention employs following technical scheme：
A kind of high-power LED driving power source, including main circuit and control circuit；The main circuit includes the input being sequentially connected
Rectification filtering unit, up and down switching tube, capacitance, transformer and output end rectification filtering unit；Wherein, input rectification is filtered
Ripple unit is the single capacitor half-bridge structure being made up of commutation diode D1-D6, electric capacity C1, the drain electrode of upper switch transistor T 1 and lower switch
Pipe T2 source electrode connects the output end of input rectification filtering unit, the leakage of the source electrode of upper switch transistor T 1 and lower switch transistor T 2 respectively
Pole is connected, and capacitance Cb is located between lower switch transistor T 2 and transformer T primary side, and the connection of output end rectification filtering unit becomes
Depressor T secondary side, is specially the full-wave rectifying circuit being made up of diode D7, D8, inductance L and electric capacity C2；
The control circuit includes PWM generation circuits, drive circuit and loop compensation circuit, and the PWM generation circuits will be simulated
Signal is converted into switching tube above and below the pwm signal of fixed cycle, the drive circuit connection, for pwm signal to be converted to
The drive signal of lower switching tube, the loop compensation circuit is used for system balance.
Further, the drive circuit includes integrated drive chips IR, resistance R1, R2, electric capacity C3, C4, diode D9-
D11；Wherein, integrated drive chips IR VDD and VCC pin connect 15V power supplies, Hin and Lin pin receive PWM and produce electricity respectively
The low and high level signal of road output, SD, VSS and COM pin ground connection；IR HO pin connection resistance R1 one end and bearing for diode D9
Pole, the resistance R1 other end and diode D9 positive pole connect the grid of the upper switch transistor T 1；IR VB pin connection electric capacity C3
One end and diode D10 negative pole, electric capacity C3 the other end connection IR VS pin and switch transistor T 1 source electrode；IR VCC pin
Connect diode D10 positive pole and electric capacity C4 one end, electric capacity C4 other end ground connection；IR LO pin connection resistance R2 one end
With diode D11 negative pole, the grid of the lower switch transistor T 2 of positive pole connection of resistance the R2 other end and diode D11.
Further, the loop compensation circuit includes current compensation network and voltage compensation network；Wherein, the electric current
Compensating network includes resistance R3-R12, Rs, electric capacity C5-C10, optocoupler OPT1, amplifier U1, U2 and the first source of stable pressure；Inductance L2
One end connection 15V power supplies, other end connection electric capacity C5 one end and optocoupler OPT1 4 pin；Optocoupler OPT1 1 pin connects
15V power supplies, 2 pin connecting resistance R4 one end, 3 pin connecting resistance R3 one end and feedback signal output FB；Resistance R4's is another
One end connects 3 pin of electric capacity C6, C7 and the first source of stable pressure, electric capacity C6 other end connection resistance R7 one end and amplifier U1's
End of oppisite phase, resistance R7 other end connection electric capacity C9 one end and amplifier U1 output end；Resistance R6 one end connection 15V is supplied
Power supply, other end connection resistance R8, electric capacity C8 one end and amplifier U1 in-phase end；Electric capacity C9 other end connection resistance
R9 one end, the resistance R9 other end connects resistance R11, R12, electric capacity C10 one end and amplifier U2 end of oppisite phase；Resistance
R10 one end and amplifier U2 output end are clicked and entered in R11 other end connection, and resistance R10 other end connection electric capacity C7's is another
One end and 1 pin of the first source of stable pressure；Amplifier U2 in-phase end connection sample rate current input and resistance Rs one end；Resistance
R3, R8, R12, Rs, the 2 pin ground connection of electric capacity C5, C8, C10 and the first source of stable pressure.
Further, the voltage compensation network includes resistance R13-R17, electric capacity C11-C13 and the second source of stable pressure；Resistance
3 pin of R13 one end connection optocoupler OPT1 2 pin, other end connection resistance R14, electric capacity C11 and the second source of stable pressure, resistance R14
One end connection electric capacity C12 one end, electric capacity the C11 other end connection resistance R15, R16, R17 one end, the second source of stable pressure
The other end of 1 pin and electric capacity C12；Resistance R15 other end connection sampled voltage input and electric capacity C13 one end, electric capacity C13
Other end connection resistance R16 the other end, 2 pin that the resistance R17 other end connects the second source of stable pressure are simultaneously grounded.
Beneficial effects of the present invention：The input rectification filtering unit of main circuit uses single capacitor half-bridge structure, with tradition
Double electric capacity half-bridge circuits are compared less with a capacitance, reduce cost, and have preferably startup special during for LED drivings
Property.Output end rectification filtering unit uses full-wave rectification structure, reduces commutation diode usage quantity, small volume and cost
It is low.Driving circuit structure is simple and driving effect is good, and with reference to loop compensation circuit, the driving to LED is more stable.The present invention's
LED drive power, without high-power electrochemical capacitor, long lifespan, small volume, output stabilization, driving effect are good, it is adaptable to high-power
The driving of LED light source, with good practicality and market prospects.
Brief description of the drawings
Fig. 1 is the module connection diagram of the high-power LED driving power source of the present invention.
Fig. 2 is the circuit diagram of main circuit in Fig. 1 embodiments.
Fig. 3 is the circuit diagram of drive circuit in Fig. 1 embodiments.
Fig. 4 is the circuit diagram of the current compensation network of Fig. 1 embodiment intermediate ring road compensation circuits.
Fig. 5 is the circuit diagram of the voltage compensation network of Fig. 1 embodiment intermediate ring road compensation circuits.
Embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described with reference to embodiment, still
It should be appreciated that these descriptions are simply to further illustrate the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
As shown in figure 1, the demand in order to meet high-power LED light source drive circuit, the present invention devises a kind of high-power
LED drive power, including main circuit and control circuit；Control circuit includes the driving electricity for being used to drive switching tube in main circuit
Road, the PWM generation circuits for controlling drive circuit, and for carrying out the loop compensation that Current Voltage is compensated in system loop
Circuit.
Specifically, as shown in Fig. 2 main circuit include be sequentially connected input rectification filtering unit, up and down switching tube, every
Straight electric capacity, transformer and output end rectification filtering unit.Wherein, input rectification filtering unit is single capacitor half-bridge structure, by
Commutation diode D1-D6, electric capacity C1 are constituted.Switching tube selects high-power MOS tube, the drain electrode of upper switch transistor T 1 and lower switch transistor T 2
Source electrode connect the output end of input rectification filtering unit respectively, the drain electrode of the source electrode of upper switch transistor T 1 and lower switch transistor T 2 connects
Connect, capacitance Cb is located between lower switch transistor T 2 and transformer T primary side, output end rectification filtering unit connection transformer
T secondary side, is specially the full-wave rectifying circuit being made up of diode D7, D8, inductance L and electric capacity C2.
Using foregoing circuit, solve electrochemical capacitor and have a strong impact on the LED drive power life-span, and existing individual event electricity is defeated
The no electrolytic capacitor LED drive power entered is because of the shortcoming containing the power frequency stroboscopic for making one kopiopia.Meanwhile, using the half of single capacitor
Bridge construction, volume, cost when solving input voltage high and no electrolytic capacitor, moire problems.
PWM generation circuits are used to being converted into analog signal into the pwm signal of fixed cycle, in being existing LED drive circuit
Conventional component, its particular circuit configurations is more ripe, does not elaborate herein.
Drive circuit connection above and below switching tube, for pwm signal to be converted to above and below switching tube drive signal.Specifically
, as shown in figure 3, drive circuit includes integrated drive chips IR, resistance R1, R2, electric capacity C3, C4, diode in the present embodiment
D9-D11.Wherein, integrated drive chips IR selects IR2113, and itself VDD and VCC pin connects 15V power supplies, Hin and Lin pin difference
Receive the low and high level signal of PWM generation circuits output, SD, VSS and COM pin ground connection；IR HO pin connection resistance R1 one end
With diode D9 negative pole, the grid of the resistance R1 upper switch transistor T 1 of the positive pole connection of the other end and diode D9；IR VB pin
Connect electric capacity C3 one end and diode D10 negative pole, the electric capacity C3 other end connection IR VS pin and the source electrode of switch transistor T 1；
IR VCC pin connection diode D10 positive pole and electric capacity C4 one end, electric capacity C4 other end ground connection；IR LO pin connection electricity
Hinder R2 one end and diode D11 negative pole, the grid of the lower switch transistor T 2 of positive pole connection of resistance the R2 other end and diode D11
Pole.
In the present invention, for LED load characteristic, network and voltage compensation network are compensated by design current, realized
It is adapted to the constant current drive mode of LED accurate pressure limiting.
Specifically, as shown in figure 4, current compensation network includes resistance R3-R12, Rs, electric capacity C5-C10, optocoupler OPT1, put
Big device U1, U2 and the first source of stable pressure.Inductance L2 one end connection 15V power supplies, other end connection electric capacity C5 one end and light
Coupling OPT1 4 pin；Optocoupler OPT1 1 pin connects 15V power supplies, 2 pin connecting resistance R4 one end, 3 pin connecting resistance R3 one end and
Feedback signal output FB；Resistance R4 other end connection electric capacity C6, C7 and 3 pin of the first source of stable pressure, the electric capacity C6 other end
Connect resistance R7 one end and amplifier U1 end of oppisite phase, resistance R7 other end connection electric capacity C9 one end and amplifier U1's
Output end；Resistance R6 one end connection 15V power supplies, the other end connects resistance R8, electric capacity C8 one end and amplifier U1
In-phase end；Electric capacity C9 other end connection resistance R9 one end, resistance R9 other end connection resistance R11, R12, electric capacity C10
One end and amplifier U2 end of oppisite phase；R10 one end and amplifier U2 output end, electricity are clicked and entered in resistance R11 other end connection
Hinder the R10 other end connection electric capacity C7 other end and 1 pin of the first source of stable pressure；Amplifier U2 in-phase end connection sample rate current
One end of input and resistance Rs；Resistance R3, R8, R12, Rs, the 2 pin ground connection of electric capacity C5, C8, C10 and the first source of stable pressure.
As shown in figure 5, voltage compensation network includes resistance R13-R17, electric capacity C11-C13 and the second source of stable pressure；Resistance R13
One end connection optocoupler OPT1 2 pin, 3 pin of other end connection resistance R14, electric capacity C11 and the second source of stable pressure, resistance R14's
One end connection electric capacity C12 one end, electric capacity the C11 other end connection resistance R15, R16, R17 one end, the 1 of the second source of stable pressure
The other end of pin and electric capacity C12；Resistance R15 other end connection sampled voltage input and electric capacity C13 one end, electric capacity C13
Other end connection resistance R16 the other end, 2 pin that the resistance R17 other end connects the second source of stable pressure are simultaneously grounded.
It is preferred that, in foregoing circuit, the first source of stable pressure and the second source of stable pressure use TL431 type controllable accurate source of stable pressure.
The explanation of above example is only intended to help and understands the method for the present invention and its core concept.It should be pointed out that pair
, under the premise without departing from the principles of the invention, can also be to present invention progress for those skilled in the art
Some improvement and modification, these are improved and modification is also fallen into the protection domain of the claims in the present invention.
Claims (4)
1. a kind of high-power LED driving power source, it is characterised in that：Including main circuit and control circuit；The main circuit include according to
The input rectification filtering unit of secondary connection, up and down switching tube, capacitance, transformer and output end rectification filtering unit；Its
In, input rectification filtering unit is the single capacitor half-bridge structure being made up of commutation diode D1-D6, electric capacity C1, upper switching tube
The source electrode of T1 drain electrode and lower switch transistor T 2 connects the output end of input rectification filtering unit, the source electrode of upper switch transistor T 1 respectively
Drain electrode with lower switch transistor T 2 is connected, and capacitance Cb is located between lower switch transistor T 2 and transformer T primary side, and output end is whole
Filter unit connection transformer T secondary side is flowed, is specially the full-wave rectification being made up of diode D7, D8, inductance L and electric capacity C2
Circuit；
The control circuit includes PWM generation circuits, drive circuit and loop compensation circuit, and the PWM generation circuits will be simulated
Signal is converted into switching tube above and below the pwm signal of fixed cycle, the drive circuit connection, for pwm signal to be converted to
The drive signal of lower switching tube, the loop compensation circuit is used for system balance.
2. high-power LED driving power source as claimed in claim 1, it is characterised in that：The drive circuit includes integrated driving
Chip I R, resistance R1, R2, electric capacity C3, C4, diode D9-D11；Wherein, integrated drive chips IR VDD and VCC pin meet 15V
Power supply, Hin and Lin pin receive the low and high level signal of PWM generation circuits output, SD, VSS and COM pin ground connection respectively；IR
HO pin connection resistance R1 one end and diode D9 negative pole, the positive pole connection of resistance the R1 other end and diode D9 is described
The grid of upper switch transistor T 1；IR VB pin connection electric capacity C3 one end and diode D10 negative pole, electric capacity C3 other end connection
IR VS pin and the source electrode of switch transistor T 1；IR VCC pin connection diode D10 positive pole and electric capacity C4 one end, electric capacity C4's
The other end is grounded；IR LO pin connection resistance R2 one end and diode D11 negative pole, resistance the R2 other end and diode
The grid of the D11 lower switch transistor T 2 of positive pole connection.
3. high-power LED driving power source as claimed in claim 1 or 2, it is characterised in that：The loop compensation circuit includes electricity
Stream compensation network and voltage compensation network；Wherein, the current compensation network includes resistance R3-R12, Rs, electric capacity C5-C10, light
Coupling OPT1, amplifier U1, U2 and the first source of stable pressure；Inductance L2 one end connection 15V power supplies, other end connection electric capacity C5's
One end and optocoupler OPT1 4 pin；Optocoupler OPT1 1 pin meets 15V power supplies, 2 pin connecting resistance R4 one end, 3 pin connecting resistance R3
One end and feedback signal output FB；Resistance R4 other end connection electric capacity C6, C7 and 3 pin of the first source of stable pressure, electric capacity C6
Other end connection resistance R7 one end and amplifier U1 end of oppisite phase, resistance R7 other end connection electric capacity C9 one end and put
Big device U1 output end；Resistance R6 one end connection 15V power supplies, the other end connects resistance R8, electric capacity C8 one end and put
Big device U1 in-phase end；Electric capacity C9 other end connection resistance R9 one end, resistance R9 other end connection resistance R11, R12,
Electric capacity C10 one end and amplifier U2 end of oppisite phase；R10 one end and amplifier U2 are clicked and entered in resistance R11 other end connection
Output end, the resistance R10 other end connection electric capacity C7 other end and 1 pin of the first source of stable pressure；Amplifier U2 in-phase end connects
Connect sample rate current input and resistance Rs one end；Resistance R3, R8, R12, Rs, the 2 of electric capacity C5, C8, C10 and the first source of stable pressure
Pin is grounded.
4. high-power LED driving power source as claimed in claim 3, it is characterised in that：The voltage compensation network includes resistance
R13-R17, electric capacity C11-C13 and the second source of stable pressure；Resistance R13 one end connection optocoupler OPT1 2 pin, other end connection resistance
R14, electric capacity C11 and the second source of stable pressure 3 pin, resistance R14 one end connection electric capacity C12 one end, the electric capacity C11 other end connect
The other end of connecting resistance R15, R16, R17 one end, 1 pin of the second source of stable pressure and electric capacity C12；Resistance R15 other end connection
One end of sampled voltage input and electric capacity C13, the electric capacity C13 other end connection resistance R16 other end, resistance R17's is another
One end connects 2 pin of the second source of stable pressure and is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710111334.XA CN106954299A (en) | 2017-02-28 | 2017-02-28 | A kind of high-power LED driving power source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710111334.XA CN106954299A (en) | 2017-02-28 | 2017-02-28 | A kind of high-power LED driving power source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108521694A (en) * | 2018-03-29 | 2018-09-11 | 电子科技大学 | A kind of LED half-bridge circuits of band feedback frequency-conversion constant-current driving |
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