CN105848353B - A kind of constant pressure dimming power source circuit - Google Patents
A kind of constant pressure dimming power source circuit Download PDFInfo
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- CN105848353B CN105848353B CN201610314428.2A CN201610314428A CN105848353B CN 105848353 B CN105848353 B CN 105848353B CN 201610314428 A CN201610314428 A CN 201610314428A CN 105848353 B CN105848353 B CN 105848353B
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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]
- H05B45/10—Controlling the intensity of the light
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a kind of constant pressure dimming power source circuit, including input rectifying filter circuit, brightness adjustment control and high frequency switching circuit, output rectifier and filter and the Isobarically Control current-limiting circuit being sequentially connected.The front end of constant pressure dimming power source circuit of the present invention connects common knob light modulator to be accessed after civil power again, and just the brightness of LED light bar or light bar can be adjusted, very simple and convenient, be the energy-conservation of LED light bar or light bar using creating condition.
Description
Technical field
The present invention relates to LED power technical field, and in particular to a kind of constant pressure dimming power source circuit.
Background technology
LED light bar or light bar are widely used in the market, and especially outdoor advertising application is very more, and outdoor billboard exists
Light pollution and electric quantity consumption can be produced if the period at midnight is too bright, at this time needs the brightness to it to be adjusted.Here lamp bar
Or light bar is constituted per all joining a current regulating resistances by several small light bead strings mostly all the way, it is general with 12Vdc or
Person 24Vdc power supply.Because 12Vdc or 24Vdc use common Switching Power Supply, LED light bar or light bar had been added both
Determine structure, the electric current of its power supply circuit can not be adjusted using common adjusting method, thus can not adjust LED light bar or
The brightness of light bar.
The content of the invention
The technical problem to be solved in the present invention is that there is provided a kind of constant pressure dimming power source electricity in view of the shortcomings of the prior art
Road, overcomes prior art can not adjust the defect of LED light bar or light bar brightness.
The present invention be solve the technical scheme that is used of above-mentioned technical problem for：
A kind of constant pressure dimming power source circuit, including the input rectifying filter circuit, brightness adjustment control and the high frequency that are sequentially connected are cut
Circuit, output rectifier and filter and Isobarically Control current-limiting circuit are changed, wherein the brightness adjustment control and high frequency switching circuit include：
Lightning protection circuit, biasing power supply dummy load circuit, adjusting control circuit and high frequency switching circuit,
The lightning protection circuit includes diode D9, electric capacity C24 and resistance R44, after electric capacity C24 and resistance R44 are in parallel, one end
Connect diode D9 negative pole, other end ground connection；
The biasing power supply dummy load circuit includes triode Q2, Zener diode Z1, resistance R7, resistance R21, resistance
R22, polarized electric capacity C15, electric capacity C5, polarized electric capacity C22, diode D2 and resistance R6, Zener diode Z1 negative pole connect
Connect triode Q2 base stage, Zener diode Z1 plus earth, after electric capacity C5 is in parallel with polarized electric capacity C22, polarized electricity
Hold C22 cathode connecting diode D2 negative pole, polarized electric capacity C22 negative pole ground connection, resistance R6 one end connection diode
D2 positive pole, other end connection transformer T1 non-same polarity 6, resistance R7 one end connection Zener diode Z1 negative pole, separately
One end is connected with polar capacitor C22 positive pole, after resistance R21 and resistance R22 connect, resistance R22 connecting triodes Q2 transmitting
Pole, polarized electric capacity C15 positive pole connecting triode Q2 emitter stage, polarized electric capacity C15 negative pole ground connection；
The adjusting control circuit include main control chip U1, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12,
Resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R23, resistance R24, electric capacity C6, electric capacity
C7, electric capacity C8 and electric capacity C9, after resistance R8, resistance R9, resistance R10 and resistance R11 are in parallel, two ends connect respectively resistance R12 and
Resistance R17, resistance R17 two ends connect resistance R11 and photoelectrical coupler U2 terminals 3, resistance R12 two ends difference respectively
Connect main control chip U1 pins 4 and resistance R8, electric capacity C7 one end connection main control chip U1 pins 4, other end ground connection, electric capacity C6
One end connection main control chip U1 pins 8, other end ground connection, resistance R15 one end connection photoelectrical coupler U2 terminals 4,
The other end is connected with polar capacitor C15 positive pole, after resistance R19 is in parallel with electric capacity C9, and one end connection resistance R18, the other end connects
Main control chip U1 pins 2 are connect, resistance R18 two ends connect resistance R19 and photoelectrical coupler U2 terminals 3, resistance R16 respectively
After in parallel with electric capacity C8, one end connection main control chip U1 pins 3, other end ground connection, after resistance R23 connects with resistance R24, resistance
The diode D9 of R23 connections lightning protection circuit positive pole, resistance R24 connection main control chip U1 pins 3；
The high frequency switching circuit include transformer T1, FET Q1, resistance R3, resistance R4, resistance R5, resistance R43,
Resistance R46, electric capacity C3 and diode D1, after resistance R3, resistance R4, resistance R5, resistance R43, resistance R46 and electric capacity C3 are in parallel,
One end connection diode D1 negative pole, other end connection transformer T1 Same Name of Ends 1, diode D1 positive pole connection transformer T1
Non-same polarity 3, transformer T1 non-same polarity 3 connects the diode D9 of lightning protection circuit positive pole, and transformer T1's is same
Name end 4 is grounded.
Embodiments in accordance with the present invention, the Isobarically Control current-limiting circuit includes：Photoelectrical coupler U2, main control chip U3,
Resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, resistance R33, resistance
R34, resistance R35, electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, polarized electric capacity C16 and diode D6, resistance R25's
Two ends connect photoelectrical coupler U2 terminals 2 and main control chip U3 pins 6 respectively, after resistance R26 connects with electric capacity C10, electricity
Hold C10 connection main control chip U3 pins 7, resistance R26 connection main control chip U3 pins 6 are electric after resistance R27 connects with electric capacity C11
Appearance C11 connection main control chip U3 pins 3, resistance R27 connection main control chip U3 pins 6, resistance R28 two ends connect mutual inductance respectively
Device L5 the second terminals and main control chip U3 pins 3, electric capacity C12 one end connection main control chip U3 pins 3, another termination
Ground, electric capacity C13 one end connection main control chip U3 pins 1, other end ground connection, resistance R29 two ends connect main control chip respectively
U3 pins 1 and main control chip U3 pins 5, after resistance R30 is in parallel with resistance R31, one end connection main control chip U3 pins 5 are another
End ground connection, after resistance R32 connect with resistance R33, one end connects main control chip U3 pins 7, and the other end connects the of transformer L5
One terminals, after resistance R34 is in parallel with resistance R35, one end connection main control chip U3 pins 7, another termination simulation ground, polarized
Electric capacity C16 cathode connecting diode D6 negative pole, polarized electric capacity C16 negative pole ground connection, diode D6 positive pole connection institute
The transformer T1 of high frequency switching circuit non-same polarity 7 is stated, diode D6 negative pole connects photoelectrical coupler U2 terminals 1,
Transformer T1 Same Name of Ends 10 and Same Name of Ends 11 is grounded.
Embodiments in accordance with the present invention, the input rectifying filter circuit includes：Fuse F1, fuse F2, pressure-sensitive electricity
Hinder VR1, piezo-resistance VR2, piezo-resistance MOV2, transformer L1, transformer L4, inductance L2, inductance L3, rectifier bridge DB1, resistance
R1, resistance R2, resistance RL1, resistance RL2, electric capacity C1, electric capacity C2, after piezo-resistance VR1 is in parallel with piezo-resistance VR2, one end connects
Connect transformer L1 the first terminals, other end connection fuse F1 and fuse F2 copolar end, the fuse F2 other end
Connect transformer L1 the second terminals, after resistance RL1 connects with resistance RL2, resistance RL1 connection transformers L4 the first wiring
End, resistance RL2 connection transformers L1 the 3rd terminals, after inductance L2 connects with inductance L3, inductance L3 connection transformers L4's
First terminals, inductance L2 connection transformers L1 the 3rd terminals, resistance RL1 is connected inductance L2 with resistance RL2 copolar end
With inductance L3 copolar end, electric capacity C1 two ends connect transformer L4 the first terminals and the second terminals, resistance R1 respectively
After being connected with resistance R2, resistance R1 connection transformers L4 the first terminals, resistance R2 connection transformers L4 the second terminals,
Transformer L1 the 4th terminals connection transformer L4 the second terminals, piezo-resistance MOV2 two ends connect transformer respectively
L4 the 3rd terminals and the 4th terminals, the rectifier bridge DB1 connection transformer of terminals 3 L4 the 3rd terminals, rectifier bridge
The DB1 connection transformer of terminals 1 L4 the 4th terminals, rectifier bridge DB1 terminals 4 are grounded, electric capacity C2 one end connection
The positive pole of rectifier bridge DB1 terminals 2 and the diode D9 of the lightning protection circuit, electric capacity C2 other end ground connection.
Embodiments in accordance with the present invention, the output rectifier and filter includes：Schottky diode Q3, polarized electric capacity
C17, polarized electric capacity C18, polarized electric capacity C19, polarized electric capacity C20, polarized electric capacity C21, transformer L5, resistance R36,
Resistance R37, resistance R38, resistance R39, resistance R40, resistance R41, resistance R42, resistance R45, resistance R36, resistance R37, resistance
After R38 and resistance R39 is in parallel, one end connection transformer L5 the first terminals, another termination simulation ground, polarized electric capacity C17,
After polarized electric capacity C18 and polarized electric capacity C19 same polarities are in parallel, positive terminal connection transformer L5 the first terminals, negative pole
Ground connection, Schottky diode Q3 positive pole connection transformer T1 non-same polarity 8 and non-same polarity 9, Schottky diode Q3's
Negative pole connection transformer L5 the first terminals, after resistance R42 is in parallel with resistance R45, one end connection transformer T1's is non-of the same name
End 8 and non-same polarity 9, other end connection electric capacity C14, electric capacity C14 two ends connect the first of resistance R42 and transformer L5 respectively
Terminals, one end is connected with polar capacitor C21 negative pole after resistance R40 is in parallel with resistance R41, other end connection transformer L5's
Second terminals, polarized electric capacity C21 positive pole connection transformer L5 the first terminals, polarized electric capacity C21 negative pole connects
Connect simulation ground, polarized electric capacity C20 positive pole connection sensor L5 the 3rd terminals, polarized electric capacity C20 negative pole connection sense
Device L5 the 4th terminals.
Implement technical scheme, have the advantages that：The preceding termination of constant pressure dimming power source circuit of the present invention
Upper common knob light modulator accesses after civil power and just the brightness of LED light bar or light bar can be adjusted again, very simple side
Just, it is the energy-conservation of LED light bar or light bar using creating condition.
Brief description of the drawings
The present invention is specifically described below with reference to accompanying drawing and with reference to example, advantages of the present invention and implementation will
More obvious, wherein content is only used for explanation of the present invention shown in accompanying drawing, without constituting to the present invention in all senses
On limitation, in the accompanying drawings：
Fig. 1 is constant pressure dimming power source module map of the present invention；
Fig. 2 is constant pressure dimming power source circuit diagram of the present invention.
Embodiment
As depicted in figs. 1 and 2, constant pressure dimming power source circuit of the present invention, including be sequentially connected input rectifying filter circuit,
Brightness adjustment control and high frequency switching circuit, output rectifier and filter and Isobarically Control current-limiting circuit, wherein the brightness adjustment control and
High frequency switching circuit includes：Lightning protection circuit, biasing power supply dummy load circuit, adjusting control circuit and high frequency switching circuit, it is described
Lightning protection circuit includes diode D9, electric capacity C24 and resistance R44, after electric capacity C24 and resistance R44 are in parallel, one end connection diode D9
Negative pole, the other end ground connection；The biasing power supply dummy load circuit includes triode Q2, Zener diode Z1, resistance R7, resistance
R21, resistance R22, polarized electric capacity C15, electric capacity C5, polarized electric capacity C22, diode D2 and resistance R6, Zener diode Z1
Negative pole connecting triode Q2 base stage, Zener diode Z1 plus earth, after electric capacity C5 is in parallel with polarized electric capacity C22,
Polarized electric capacity C22 cathode connecting diode D2 negative pole, polarized electric capacity C22 negative pole ground connection, resistance R6 one end connects
Diode D2 positive pole is connect, the other end connects transformer T1 non-same polarity 6, resistance R7 one end connection Zener diode Z1's
Negative pole, the other end is connected with polar capacitor C22 positive pole, after resistance R21 and resistance R22 connect, resistance R22 connecting triodes Q2
Emitter stage, polarized electric capacity C15 positive pole connecting triode Q2 emitter stage, polarized electric capacity C15 negative pole ground connection；Light modulation
Control circuit include main control chip U1, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R15, resistance R16,
Resistance R17, resistance R18, resistance R19, resistance R20, resistance R23, resistance R24, electric capacity C6, electric capacity C7, electric capacity C8 and electric capacity C9,
After resistance R8, resistance R9, resistance R10 and resistance R11 are in parallel, two ends connect resistance R12 and resistance R17, the two of resistance R17 respectively
End connects resistance R11 and photoelectrical coupler U2 terminals 3 respectively, and resistance R12 two ends connect main control chip U1 pins 4 respectively
With resistance R8, electric capacity C7 one end connection main control chip U1 pins 4, other end ground connection, electric capacity C6 one end connection main control chip
U1 pins 8, other end ground connection, resistance R15 one end connection photoelectrical coupler U2 terminals 4, other end connection polarized electricity
Hold C15 positive pole, after resistance R19 is in parallel with electric capacity C9, one end connection resistance R18, the other end connection main control chip U1 pin 2,
Resistance R18 two ends connect resistance R19 and photoelectrical coupler U2 terminals 3, after resistance R16 is in parallel with electric capacity C8, one respectively
End connection main control chip U1 pins 3, other end ground connection, after resistance R23 connects with resistance R24, the resistance R23 connections thunder-lightning
The diode D9 on road positive pole, resistance R24 connection main control chip U1 pins 3；High frequency switching circuit includes transformer T1, field-effect
Pipe Q1, resistance R3, resistance R4, resistance R5, resistance R43, resistance R46, electric capacity C3 and diode D1, resistance R3, resistance R4, resistance
After R5, resistance R43, resistance R46 and electric capacity C3 are in parallel, one end connection diode D1 negative pole, other end connection transformer T1's
Same Name of Ends 1, diode D1 positive pole connection transformer T1 non-same polarity 3, transformer T1 non-same polarity 3 connects the lightning protection
The diode D9 of circuit positive pole, transformer T1 Same Name of Ends 4 is grounded.Isobarically Control current-limiting circuit include photoelectrical coupler U2,
Main control chip U3, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, electricity
Hinder R33, resistance R34, resistance R35, electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, polarized electric capacity C16 and diode
D6, resistance R25 two ends connect photoelectrical coupler U2 terminals 2 and main control chip U3 pins 6, resistance R26 and electric capacity respectively
After C10 series connection, electric capacity C10 connection main control chip U3 pins 7, resistance R26 connection main control chip U3 pins 6, resistance R27 and electric capacity
After C11 series connection, electric capacity C11 connection main control chip U3 pins 3, resistance R27 connection main control chip U3 pins 6, resistance R28 two ends
Transformer L5 the second terminals and main control chip U3 pins 3, electric capacity C12 one end connection main control chip U3 pins are connected respectively
3, other end ground connection, electric capacity C13 one end connection main control chip U3 pins 1, other end ground connection, resistance R29 two ends connect respectively
Main control chip U3 pins 1 and main control chip U3 pins 5 are connect, after resistance R30 is in parallel with resistance R31, one end connection main control chip U3
Pin 5, other end ground connection, after resistance R32 connects with resistance R33, one end connection main control chip U3 pins 7, other end connection is mutual
Sensor L5 the first terminals, after resistance R34 is in parallel with resistance R35, one end connection main control chip U3 pins 7, another termination mould
Intend ground, polarized electric capacity C16 cathode connecting diode D6 negative pole, polarized electric capacity C16 negative pole is grounded, diode D6's
Positive pole connects the transformer T1 of high frequency switching circuit non-same polarity 7, diode D6 negative pole connection photoelectrical coupler U2
Terminals 1, transformer T1 Same Name of Ends 10 and Same Name of Ends 11 are grounded.Input rectifying filter circuit includes fuse F1, fusing
It is device F2, piezo-resistance VR1, piezo-resistance VR2, piezo-resistance MOV2, transformer L1, transformer L4, inductance L2, inductance L3, whole
Flow bridge DB1, resistance R1, resistance R2, resistance RL1, resistance RL2, electric capacity C1, electric capacity C2, piezo-resistance VR1 and piezo-resistance VR2
After parallel connection, one end connection transformer L1 the first terminals, other end connection fuse F1 and fuse F2 copolar end, fusing
Device F2 other end connection transformer L1 the second terminals, after resistance RL1 connects with resistance RL2, resistance RL1 connection transformers
L4 the first terminals, resistance RL2 connection transformers L1 the 3rd terminals, after inductance L2 connects with inductance L3, inductance L3 connects
Connect transformer L4 the first terminals, inductance L2 connection transformers L1 the 3rd terminals, resistance RL1 and resistance RL2 copolar
End connection inductance L2 and inductance L3 copolar end, electric capacity C1 two ends connect transformer L4 the first terminals and second and connect respectively
Line end, after resistance R1 connects with resistance R2, resistance R1 connection transformers L4 the first terminals, resistance R2 connection transformers L4's
Second terminals, transformer L1 the 4th terminals connection transformer L4 the second terminals, piezo-resistance MOV2 two ends point
Not Lian Jie transformer L4 the 3rd terminals and the 4th terminals, the 3rd of the rectifier bridge DB1 connection of terminals 3 transformer L4 connects
Line end, the rectifier bridge DB1 connection transformer of terminals 1 L4 the 4th terminals, rectifier bridge DB1 terminals 4 are grounded, electric capacity C2
One end connection rectifier bridge DB1 terminals 2 and the lightning protection circuit diode D9 positive pole, electric capacity C2 another termination
Ground.Output rectifier and filter includes Schottky diode Q3, polarized electric capacity C17, polarized electric capacity C18, polarized electric capacity
C19, polarized electric capacity C20, polarized electric capacity C21, transformer L5, resistance R36, resistance R37, resistance R38, resistance R39, resistance
R40, resistance R41, resistance R42, resistance R45, after resistance R36, resistance R37, resistance R38 and resistance R39 are in parallel, one end connection is mutual
Sensor L5 the first terminals, another termination simulation ground, polarized electric capacity C17, polarized electric capacity C18 and polarized electric capacity C19
After same polarity is in parallel, positive terminal connection transformer L5 the first terminals, negative pole ground connection, Schottky diode Q3 positive pole connection
Transformer T1 non-same polarity 8 and non-same polarity 9, Schottky diode Q3 negative pole connection transformer L5 the first terminals,
After resistance R42 is in parallel with resistance R45, one end connection transformer T1 non-same polarity 8 and non-same polarity 9, other end connection electric capacity
C14, electric capacity C14 two ends connect resistance R42 and transformer L5 the first terminals respectively, after resistance R40 is in parallel with resistance R41
One end is connected with polar capacitor C21 negative pole, and the other end connects transformer L5 the second terminals, and polarized electric capacity C21 is just
Pole connection transformer L5 the first terminals, polarized electric capacity C21 negative pole connection simulation ground, polarized electric capacity C20 positive pole
Connect sensor L5 the 3rd terminals, polarized electric capacity C20 negative pole connection sensor L5 the 4th terminals.
Input rectifying filter circuit it is main by fuse F1, it is fuse F2, piezo-resistance VR1, piezo-resistance VR2, pressure-sensitive
Resistance MOV2, transformer L1, transformer L4, inductance L2, inductance L3, rectifier bridge DB1, resistance R1, resistance R2, resistance RL1, resistance
RL2, electric capacity C1, electric capacity C2 compositions, C1 effect here is to eliminate Conducted Electromagnetic Interference, and eliminating Conducted Electromagnetic Interference needs electric capacity
Capacity compared with the effect that great talent has had, but because constant pressure dimming power source circuit front-end of the present invention to access controllable silicon dimmer, C1
Capacity is the smaller the better（Because controllable silicon dimmer is compatible with capacitive load mismatch）, two aspect factors are integrated, C1 capacity takes
Value should be less than 47NF, and C1 values, which cross conference, causes the repeated trigger of light modulator, cause LED light bar or light bar to flash.Piezo-resistance
VR1, VR2, MOV2 constitute surge and thunderbolt absorbing circuit, and resistance RL1 and resistance RL2 are extremely important, because L2 and L3 sense
Very big, the vibration that circuit can be caused larger is measured, resistance RL1 and resistance RL2 are to eliminate self-oscillatory, it is to avoid LED light bar or lamp
Band flicker, so RL1 and RL2 need to select larger value of power resistor, can be 100-470 Europe, it is big from wattage rating
In 2W metalfilmresistors because constant pressure dimming power source circuit of the present invention be applied to controllable silicon light modulation occasion, it is necessary to capacitive load
It is as far as possible small, so C2 capacity generally should be smaller than 1UF, because capacitive reactances is smaller in circuit, if what external lightning entered
Words can be caused damage to power circuit, therefore the thunder in lightning protection circuit, absorbing circuit is added in constant pressure dimming power source circuit of the present invention
Hit and surge, lightning protection circuit is made up of D9, C24, R44.High frequency switching circuit include transformer T1, FET Q1, resistance R3,
D1 and C3, R4, R3, R5, R43, R46 in resistance R4, resistance R5, resistance R43, resistance R46, electric capacity C3 and diode D1, circuit
Peak absorbing network is constituted, to protect FET Q1, T1 is by main winding（Terminal 1-3）, auxiliary power supply winding（Terminal 4-6）
Constituted with secondary commutation winding.Biasing power supply dummy load circuit includes triode Q2, Zener diode Z1, resistance R7, resistance
R21, resistance R22, polarized electric capacity C15, electric capacity C5, polarized electric capacity C22, diode D2 and resistance R6, biasing power supply are false negative
Carrying circuit has two effects, and one is powered to main control chip U1, while also functioning to the effect of fictitious load, is provided to light modulator
One holding electric current, and then ensure more preferable dimming effect, Z1, Q2, R7 constitute the steady reduction voltage circuit of series connection, and Q2 selects an envelope
Dress is than larger triode, because the heat produced here is larger.When loading LED in the stage dimmed, circuit output voltage ripple
Dynamic larger, corresponding main control chip U1 power supply can also change therewith, have Z1, Q2, R7 to constitute the steady reduction voltage circuit of series connection, master control
Chip U1 supply voltages are stable, while ensureing, when LED is compared with low-light level, larger load also to be had by the electric current of this circuit
Consumption, serves the effect of fictitious load, it is ensured that the dimming effect of LED light bar or light bar。Adjusting control circuit includes master control core
Piece U1, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R15, resistance R16, resistance R17, resistance R18, electricity
Resistance R19, resistance R20, resistance R23, resistance R24, electric capacity C6, electric capacity C7, electric capacity C8 and electric capacity C9, wherein U1, which can be used, to be faced
The current control PFC IC chips of boundary's pattern, L6561, FAIRCHILD FAN7527 of such as ST companies, main control chip U1 pipes
Pin 3 receives the dim signal of controllable silicon dimmer, and a reference voltage, this base are obtained by internal sample and multiplier circuit
Quasi- voltage determines the peak current magnitude into main control chip U1 pins 4, and this current amplitude determines constant pressure dimming power source
The ability of circuit output load, i.e. maximum operating current.Because the output voltage of adjusting control circuit is that comparison is constant, institute
With by adjusting external dimmer device, it is possible to change the load capacity of constant pressure dimming power source circuit of the present invention, add Isobarically Control
Current-limiting circuit ensures output voltage stabilization, so easily can just pass through very much external dimmer device de-regulation LED light bar or light bar
Brightness light and shade, realizes LED light bar or light bar brightness change.Isobarically Control current-limiting circuit includes photoelectrical coupler U2, main control chip
U3, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, resistance R33, electricity
Hinder R34, resistance R35, electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, polarized electric capacity C16 and diode D6, master control core
Piece U3 uses the TSM103 of ST companies, and there are constant pressure and flow fiducial reference source, also two-way error amplifier in U3 inside, and electric current leads to
Constant pressure sampling resistor R32, R33, R34, R35 are crossed into U3 pins 7, is gone again to the output of U3 pins 6 by internal error comparator
Photoelectrical coupler U2 is controlled, the purpose of Isobarically Control is reached, current-limiting control circuit is mainly by R40, R41, R28, R29, R30, R31
Deng composition.Output rectifier and filter includes Schottky diode Q3, polarized electric capacity C17, polarized electric capacity C18, polarized
Electric capacity C19, polarized electric capacity C20, polarized electric capacity C21, transformer L5, resistance R36, resistance R37, resistance R38, resistance R39,
Resistance R40, resistance R41, resistance R42, resistance R45, power to LED load, and wherein R42, R45, C14 constitute Q3 diodes
Absorber, damping electromagnetic interference signal.R36, R37, R38, R39 are dummy resistances, it is ensured that circuit is when loading very light
Also there is more stable state.
Those skilled in the art do not depart from the essence and spirit of the present invention, can have various deformation scheme to realize the present invention,
Preferable feasible embodiment of the invention is the foregoing is only, not thereby limits to the interest field of the present invention, it is all with this
Within the equivalent structure change that description of the invention and accompanying drawing content are made, the interest field for being both contained in the present invention.
Claims (4)
1. a kind of constant pressure dimming power source circuit, it is characterised in that：Including be sequentially connected input rectifying filter circuit, brightness adjustment control
With high frequency switching circuit, output rectifier and filter and Isobarically Control current-limiting circuit, wherein the brightness adjustment control and high frequency switching
Circuit includes：
Lightning protection circuit, biasing power supply dummy load circuit, adjusting control circuit and high frequency switching circuit,
The lightning protection circuit includes diode D9, electric capacity C24 and resistance R44, after electric capacity C24 and resistance R44 are in parallel, one end connection
Diode D9 negative pole, other end ground connection；
The biasing power supply dummy load circuit includes triode Q2, Zener diode Z1, resistance R7, resistance R21, resistance R22, had
Polar capacitor C15, electric capacity C5, polarized electric capacity C22, diode D2 and resistance R6, Zener diode Z1 negative pole connect three poles
Pipe Q2 base stage, Zener diode Z1 plus earth, after electric capacity C5 is in parallel with polarized electric capacity C22, polarized electric capacity C22's
Cathode connecting diode D2 negative pole, polarized electric capacity C22 negative pole ground connection, resistance R6 one end connection diode D2 is just
Pole, other end connection transformer T1 non-same polarity 6, resistance R7 one end connection Zener diode Z1 negative pole, the other end connects
Polar capacitor C22 positive pole is connected to, after resistance R21 and resistance R22 connect, resistance R22 connecting triodes Q2 emitter stage has pole
Property electric capacity C15 positive pole connecting triode Q2 emitter stage, polarized electric capacity C15 negative pole ground connection；
The adjusting control circuit includes main control chip U1, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance
R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R23, resistance R24, electric capacity C6, electric capacity C7, electricity
Hold C8 and electric capacity C9, after resistance R8, resistance R9, resistance R10 and resistance R11 are in parallel, two ends connect resistance R12 and resistance respectively
R17, resistance R17 two ends connect resistance R11 and photoelectrical coupler U2 terminals 3 respectively, and resistance R12 two ends are connected respectively
Main control chip U1 pins 4 and resistance R8, electric capacity C7 one end connection main control chip U1 pins 4, other end ground connection, the one of electric capacity C6
End connection main control chip U1 pins 8, other end ground connection, resistance R15 one end connection photoelectrical coupler U2 terminals 4 are another
End is connected with polar capacitor C15 positive pole, after resistance R19 is in parallel with electric capacity C9, one end connection resistance R18, other end connection master
Chip U1 pins 2 are controlled, resistance R18 two ends connect resistance R19 and photoelectrical coupler U2 terminals 3, resistance R16 and electricity respectively
Hold after C8 parallel connections, one end connection main control chip U1 pins 3, other end ground connection, after resistance R23 connects with resistance R24, resistance R23
Connect the diode D9 of lightning protection circuit positive pole, resistance R24 connection main control chip U1 pins 3；
The high frequency switching circuit includes transformer T1, FET Q1, resistance R3, resistance R4, resistance R5, resistance R43, resistance
R46, electric capacity C3 and diode D1, after resistance R3, resistance R4, resistance R5, resistance R43, resistance R46 and electric capacity C3 are in parallel, one end
Diode D1 negative pole is connected, other end connection transformer T1 Same Name of Ends 1, diode D1 positive pole connection transformer T1's is non-
Same Name of Ends 3, transformer T1 non-same polarity 3 connects the diode D9 of lightning protection circuit positive pole, transformer T1 Same Name of Ends 4
Ground connection.
2. constant pressure dimming power source circuit according to claim 1, it is characterised in that the Isobarically Control current-limiting circuit bag
Include：Photoelectrical coupler U2, main control chip U3, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, electricity
Hinder R31, resistance R32, resistance R33, resistance R34, resistance R35, electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, polarized
Electric capacity C16 and diode D6, resistance R25 two ends connect photoelectrical coupler U2 terminals 2 and main control chip U3 pins respectively
6, after resistance R26 connects with electric capacity C10, electric capacity C10 connection main control chip U3 pins 7, resistance R26 connection main control chip U3 pins
6, after resistance R27 connects with electric capacity C11, electric capacity C11 connection main control chip U3 pins 3, resistance R27 connection main control chip U3 pins
6, resistance R28 two ends connect transformer L5 the second terminals and main control chip U3 pins 3 respectively, and electric capacity C12 one end connects
Connect main control chip U3 pins 3, other end ground connection, electric capacity C13 one end connection main control chip U3 pins 1, other end ground connection, resistance
R29 two ends connect main control chip U3 pins 1 and main control chip U3 pins 5, after resistance R30 is in parallel with resistance R31, one end respectively
Main control chip U3 pins 5 are connected, the other end is grounded, after resistance R32 connects with resistance R33, one end connection main control chip U3 pins
7, other end connection transformer L5 the first terminals, after resistance R34 is in parallel with resistance R35, one end connection main control chip U3 pipes
Pin 7, another termination simulation ground, polarized electric capacity C16 cathode connecting diode D6 negative pole, polarized electric capacity C16 negative pole
Ground connection, diode D6 positive pole connects the transformer T1 of high frequency switching circuit non-same polarity 7, and diode D6 negative pole connects
Photoelectrical coupler U2 terminals 1 are connect, transformer T1 Same Name of Ends 10 and Same Name of Ends 11 are grounded.
3. constant pressure dimming power source circuit according to claim 2, it is characterised in that the input rectifying filter circuit bag
Include：Fuse F1, fuse F2, piezo-resistance VR1, piezo-resistance VR2, piezo-resistance MOV2, transformer L1, transformer L4,
Inductance L2, inductance L3, rectifier bridge DB1, resistance R1, resistance R2, resistance RL1, resistance RL2, electric capacity C1, electric capacity C2, piezo-resistance
After VR1 is in parallel with piezo-resistance VR2, one end connection transformer L1 the first terminals, other end connection fuse F1 is with fusing
Device F2 copolar end, fuse F2 other end connection transformer L1 the second terminals, after resistance RL1 connects with resistance RL2,
Resistance RL1 connection transformers L4 the first terminals, resistance RL2 connection transformers L1 the 3rd terminals, inductance L2 and inductance
After L3 series connection, inductance L3 connection transformers L4 the first terminals, inductance L2 connection transformers L1 the 3rd terminals, resistance
RL1 is connected inductance L2 and inductance L3 copolar end with resistance RL2 copolar end, and electric capacity C1 two ends connect transformer L4's respectively
First terminals and the second terminals, after resistance R1 connects with resistance R2, resistance R1 connection transformers L4 the first terminals, electricity
Hinder R2 connection transformers L4 the second terminals, transformer L1 the 4th terminals connection transformer L4 the second terminals, pressure
Quick resistance MOV2 two ends connect transformer L4 the 3rd terminals and the 4th terminals respectively, and rectifier bridge DB1 terminals 3 connect
Transformer L4 the 3rd terminals are connect, rectifier bridge DB1 terminals 1 connect transformer L4 the 4th terminals, rectifier bridge DB1's
Terminals 4 are grounded, electric capacity C2 one end connection rectifier bridge DB1 terminals 2 and the diode D9 of the lightning protection circuit positive pole,
Electric capacity C2 other end ground connection.
4. constant pressure dimming power source circuit according to claim 3, it is characterised in that the output rectifier and filter bag
Include：Schottky diode Q3, polarized electric capacity C17, polarized electric capacity C18, polarized electric capacity C19, polarized electric capacity C20, have
Polar capacitor C21, transformer L5, resistance R36, resistance R37, resistance R38, resistance R39, resistance R40, resistance R41, resistance R42,
After resistance R45, resistance R36, resistance R37, resistance R38 and resistance R39 are in parallel, one end connection transformer L5 the first terminals,
After another termination simulation ground, polarized electric capacity C17, polarized electric capacity C18 and the parallel connection of polarized electric capacity C19 same polarities, positive terminal
Connect transformer L5 the first terminals, negative pole ground connection, Schottky diode Q3 positive pole connection transformer T1 non-same polarity 8
With non-same polarity 9, Schottky diode Q3 negative pole connects transformer L5 the first terminals, and resistance R42 is in parallel with resistance R45
Afterwards, one end connection transformer T1 non-same polarity 8 and non-same polarity 9, the other end connection electric capacity C14, electric capacity C14 two ends difference
Resistance R42 and transformer L5 the first terminals are connected, one end is connected with polar capacitor C21 after resistance R40 is in parallel with resistance R41
Negative pole, other end connection transformer L5 the second terminals, the first of polarized electric capacity C21 positive pole connection transformer L5 connects
Line end, polarized electric capacity C21 negative pole connection simulation ground, polarized electric capacity C20 positive pole connection sensor L5 the 3rd terminals,
Polarized electric capacity C20 negative pole connection sensor L5 the 4th terminals.
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| CN201610314428.2A CN105848353B (en) | 2016-05-13 | 2016-05-13 | A kind of constant pressure dimming power source circuit |
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| CN201610314428.2A CN105848353B (en) | 2016-05-13 | 2016-05-13 | A kind of constant pressure dimming power source circuit |
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| CN105848353B true CN105848353B (en) | 2017-10-27 |
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| CN201657438U (en) * | 2010-04-22 | 2010-11-24 | 彭孟展 | Adjustable optical drive circuit compatible to silicon controlled light modulator |
| CN102056363A (en) * | 2009-11-11 | 2011-05-11 | 海洋王照明科技股份有限公司 | LED power driving circuit |
| CN202949600U (en) * | 2012-11-06 | 2013-05-22 | 黄山乾龙电器有限公司 | Anti-lightning type light emitting diode (LED) power supply |
| CN203761633U (en) * | 2013-12-28 | 2014-08-06 | 深圳市法马新智能设备有限公司 | Energy-saving LED traffic light with long service life |
| CN205657884U (en) * | 2016-05-13 | 2016-10-19 | 东莞市领冠半导体照明有限公司 | Constant voltage power supply circuit that adjusts luminance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102056363A (en) * | 2009-11-11 | 2011-05-11 | 海洋王照明科技股份有限公司 | LED power driving circuit |
| CN201657438U (en) * | 2010-04-22 | 2010-11-24 | 彭孟展 | Adjustable optical drive circuit compatible to silicon controlled light modulator |
| CN202949600U (en) * | 2012-11-06 | 2013-05-22 | 黄山乾龙电器有限公司 | Anti-lightning type light emitting diode (LED) power supply |
| CN203761633U (en) * | 2013-12-28 | 2014-08-06 | 深圳市法马新智能设备有限公司 | Energy-saving LED traffic light with long service life |
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Address after: 523000 Daliantang Industrial Zone No. 3, Daliantang Community, Wanjiang District, Dongguan City, Guangdong Province Patentee after: Guangdong Collar Crown Intelligent Technology Co., Ltd. Address before: 523000 Daliantang Industrial Zone No. 3, Daliantang Community, Wanjiang District, Dongguan City, Guangdong Province Patentee before: Linkun (Dongguan) Semiconductor Lighting Co., Ltd. |
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