CN110225617A - A kind of dimming drive power circuit - Google Patents
A kind of dimming drive power circuit Download PDFInfo
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- CN110225617A CN110225617A CN201910493484.0A CN201910493484A CN110225617A CN 110225617 A CN110225617 A CN 110225617A CN 201910493484 A CN201910493484 A CN 201910493484A CN 110225617 A CN110225617 A CN 110225617A
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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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Abstract
The embodiment of the invention discloses a kind of dimming drive power circuits, including MLV dimming controlling module, MLV transformer, the first rectification filtering module, the second rectification filtering module, first voltage conversion module, second voltage conversion module and knob dimming controlling module；The input terminal of the input terminal of first rectification filtering module and the second rectification filtering module is electrically connected with MLV transformer, the output end of first rectification filtering module is electrically connected with the input terminal of first voltage conversion module, and the input terminal of second voltage conversion module is electrically connected with the output end of first voltage conversion module；The output end of second rectification filtering module is electrically connected with the first input end of knob dimming controlling module；Second input terminal of knob dimming controlling module is electrically connected with the output end of first voltage conversion module, and the output end of knob dimming controlling module is electrically connected with the control terminal of second voltage conversion module.MLV light modulation and the light modulation of compatible knob are realized, facilitates user to select a product and realizes the demands of various brightness.
Description
Technical field
The present embodiments relate to power technique fields more particularly to a kind of dimming drive power circuits.
Background technique
LED illumination product is largely popularized at present, especially LED illumination instead of traditional lighting products use, with people
Living standard improve, the application of LED Landscape Lighting is a large amount of universal, and the mankind are in severe energy consumption and heavy environment pressure
In power, so reducing lighting energy consumption is the emphasis that society pays close attention to always.
What LED Landscape Lighting was generally used is electromagnetic type low pressure (Magnetic Low Voltage, MLV) transformer, will
Alternating current is converted into low pressure and supplies electricity to AC-DC low-voltage driving power drives LED and realize illumination.
But the low-voltage driving product that most of Landscape Lighting MLV transformer is connect in the market can not achieve light modulation, from
And client cannot select brightness on demand, it can not on-demand energy saving.
Summary of the invention
The embodiment of the present invention provides a kind of dimming drive power circuit, dims for MLV, meets the needs of different brightness
Using, while compatible knob light modulation, the demand that user selects a product and realizes various brightness is significantly facilitated, there is light modulation
The features such as compatible strong, dimming scope is wide, good dimming effect.
In a first aspect, the embodiment of the invention provides a kind of dimming drive power circuit, including MLV dimming controlling module,
MLV transformer, the first rectification filtering module, the second rectification filtering module, first voltage conversion module, second voltage conversion module
With knob dimming controlling module；
The input terminal of the MLV dimming controlling module is for input AC electricity, the output of the MLV dimming controlling module
End is electrically connected with the input terminal of the MLV transformer；
The input terminal of first rectification filtering module is electrically connected with the output end of the MLV transformer, and described first is whole
The output end of stream filter module is electrically connected with the input terminal of the first voltage conversion module, and the first voltage conversion module is used
It is exported after by the conversion of the voltage of input terminal from output end；
The input terminal of the second voltage conversion module is electrically connected with the output end of the first voltage conversion module, described
The output end of second voltage conversion module is used for for connecting light emitting device, the second voltage conversion module according to control terminal
Signal adjusts output end output signal size, to drive the light emitting device light modulation of electrical connection；
The first input end of second rectification filtering module is electrically connected with the output end of the MLV transformer, and described
The output end of two rectification filtering modules is electrically connected with the first input end of the knob dimming controlling module；
Second input terminal of the knob dimming controlling module is electrically connected with the output end of the first voltage conversion module,
The output end of the knob dimming controlling module is electrically connected with the control terminal of the second voltage conversion module, the knob light modulation
The signal of control module output end output is adjustable.
Optionally, first rectification filtering module includes: full wave rectifier bridge stack and first capacitor, wherein the all-wave
The input terminal of rectifier bridge stack is electrically connected with the output end of the MLV transformer, the output end of the full wave rectifier bridge stack with it is described
The input terminal of first voltage conversion module is electrically connected, and the first capacitor is parallel to the output end of the rectifier bridge stack.
Optionally, second rectification filtering module includes: first diode and the second diode；
The anode of the anode of the first diode and second diode output end with the MLV transformer respectively
First port and second port electrical connection, the cathode of the cathode of the first diode and second diode with it is described
The first input end of knob dimming controlling module is electrically connected.
Optionally, the knob dimming controlling module include the first bleeder circuit, first resistor, the first adjustable potentiometer and
Triode；
The first end of first adjustable potentiometer and the cathode of the first diode and second diode
Cathode electrical connection, the second end of first adjustable potentiometer are grounded by the first resistor；
The control electrode of the triode is electrically connected with the output end of first adjustable potentiometer, and the first of the triode
Pole is electrically connected with the output end of the first voltage conversion module, the second pole of the triode and the first of the bleeder circuit
End electrical connection, the second end ground connection of first bleeder circuit, the output end of first bleeder circuit and the second voltage
The control terminal of conversion module is electrically connected.
Optionally, second rectification filtering module further includes second resistance, the second capacitor and zener diode；Wherein,
The cathode of the cathode of the first diode and second diode passes through the second resistance and first adjustable electric
The first end electrical connection of position device；The first end of second capacitor is electrically connected with the first end of first adjustable potentiometer, institute
State the second end ground connection of the second capacitor；
The zener diode is in parallel with second capacitor；
First bleeder circuit includes 3rd resistor and the 4th resistance, and the first end of the 3rd resistor is as described
The first end of one bleeder circuit, the second end of the 3rd resistor are electrically connected with the first end of the 4th resistance, and as institute
State the output end of the first bleeder circuit, second end of the second end of the 4th resistance as first bleeder circuit.
Optionally, the first voltage conversion module includes: the first DC-DC chip, first switch tube, the 5th resistance,
Six resistance, the first inductance, third capacitor, third diode and the second bleeder circuit；Wherein, the first DC-DC chip includes
Voltage input end, current sampling input terminal, switching signal output end and feedback voltage input terminal；
The voltage input end of the first DC-DC chip is electrically connected with the output end of first current rectifying and wave filtering circuit, institute
The first end for stating the 5th resistance is electrically connected with the voltage input end, and the second end of the 5th resistance and the current sampling are defeated
Enter the first end electrical connection of end and first inductance, the anode of the second end of first inductance and the third diode
Electrical connection, the cathode of the third diode are electrically connected with the output end of the first voltage conversion module；
The control terminal of the first switch tube is electrically connected by the 6th resistance with the switching signal output end, described
The first end of first switch tube is electrically connected with the second end of second inductance, the second end ground connection of the first switch tube；
The first end of second bleeder circuit is electrically connected with the second end of first inductance, second bleeder circuit
Second end ground connection, the output end of the second bleeder circuit is electrically connected with the feedback voltage input terminal；
The first end of the third capacitor is electrically connected with the cathode of the third diode, the second end of the third capacitor
Ground connection.
Optionally, second bleeder circuit includes the 7th resistance and the 8th resistance；
First end of the first end of 7th resistance as second bleeder circuit, the second end of the 7th resistance
The output end as second bleeder circuit, the second end of the 8th resistance are electrically connected with the first end of the 8th resistance
Second end as second bleeder circuit.
Optionally, the second voltage conversion module includes: the 2nd DC-DC chip, the 7th resistance, the 8th resistance, second
Adjustable potentiometer, the 4th diode, the 4th capacitor and the second inductance；Wherein, the 2nd DC-DC chip includes voltage input
End, drive output, first switch control output end, second switch control output end and control terminal；
The voltage input end of the 2nd DC-DC chip and the cathode of the 4th diode turn with the first voltage
The output end electrical connection of block is changed the mold, the anode of the 4th diode is electrically connected with the second switch control output end；
The voltage of the first end of 7th resistance and the first end of the 8th resistance with the 2nd DC-DC chip
Input terminal electrical connection, the second end of the 8th resistance are electrically connected with the drive output, the second end of the 7th resistance
It is electrically connected with the first end of second adjustable potentiometer, the second end of second adjustable potentiometer is hanging, and described second can
The output end of potentiometer is adjusted to be electrically connected with the second end of the 8th resistance, the drive output is as second voltage modulus of conversion
The first port of block output end；
The control terminal of the 2nd DC-DC chip is electrically connected with the output end of the knob dimming controlling module；
The first end of second inductance is electrically connected with the first switch control output end, and the second of second inductance
Hold the second port as the second voltage conversion module output end；
4th capacitor is parallel to the output end of the second voltage conversion module.
Optionally, the dimming drive power circuit further includes surge absorption module；
First rectification filtering module and second rectification filtering module pass through the surge absorption module and institute
The output end electrical connection of MLV transformer is stated, the surge absorption module is for absorbing surging.
Optionally, the surge absorption module includes fuse and varistor；
The first end of the fuse is electrically connected with the first port of the MLV transformer output end, the fuse
Second end is electrically connected with the input terminal of the full wave rectifier bridge stack；
The first end of the varistor is electrically connected with the second end of the fuse, the second end of the varistor with
The second port of the MLV transformer output end is electrically connected.
Technical solution provided in an embodiment of the present invention, by using including MLV dimming controlling module, MLV transformer, first
Rectification filtering module, the second rectification filtering module, first voltage conversion module, second voltage conversion module and knob brightness adjustment control
The dimming drive power circuit of module provides user demand customization by knob dimming function while realizing MLV light modulation
Brightness meets different user because of the demand of difference brightness needed for different scenes, stable can provide power supply for lamps and lanterns,
And save energy consumption.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of dimming drive power circuit provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Fig. 1 is a kind of structural schematic diagram of dimming drive power circuit provided in an embodiment of the present invention, with reference to Fig. 1, driving
Power circuit includes MLV dimming controlling module 11, MLV transformer 12, the first rectification filtering module 13, the second rectification filtering module
14, first voltage conversion module 15, second voltage conversion module 16 and knob dimming controlling module 17；
The input terminal A1 of MLV dimming controlling module 11 is for input AC electricity, the output terminals A 2 of MLV dimming controlling module 11
It is electrically connected with the input terminal B1 of MLV transformer 12；
The input terminal C1 of first rectification filtering module 13 is electrically connected with the output end B2 of MLV transformer 12, the first rectification filter
The output end C2 of wave module 13 is electrically connected with the input terminal D1 of first voltage conversion module 15, and first voltage conversion module 15 is used for
It is exported after the voltage of input terminal D1 is converted from output end D2；
The input terminal G1 of second voltage conversion module 16 is electrically connected with the output end D2 of first voltage conversion module 15, and second
The output end G2 of voltage transformation module 16 is used for for connecting light emitting device, second voltage conversion module 16 according to control terminal G3's
Signal adjusts output end G2 output signal size, to drive the light emitting device light modulation of electrical connection；
The input terminal E1 of second rectification filtering module 14 is electrically connected with the output end B2 of MLV transformer 12, the second rectification filter
The output end E2 of wave module is electrically connected with the first input end F1 of knob dimming controlling module 17；
Second input terminal F2 of knob dimming controlling module 17 is electrically connected with the output end D2 of first voltage conversion module 15,
The output end F3 of knob dimming controlling module 17 is electrically connected with the control terminal G3 of second voltage conversion module 16, knob brightness adjustment control
The signal of 17 pieces of output end F3 of mould output is adjustable.
Dimming drive power circuit provided in an embodiment of the present invention, such as become suitable for the MLV that alternating voltage is 9~15V
The output end of depressor realizes different brightness by knob light modulation on the basis of MLV light modulation, to adapt to Landscape Lighting
System.Illustratively, knob dimming controlling module 17 passes through the voltage swing of control 16 control terminal G3 of second voltage conversion module,
Second voltage conversion module 16 adjusts output end G2 output signal size according to the signal of control terminal G3, to drive the hair of electrical connection
Electro-optical device light modulation, the signal of output end G2 output are current signal.
Specifically, MLV transformer 12 can be big according to the corresponding voltage of control voltage output of MLV dimming controlling module 11
Small, the voltage that the first rectification filtering module exports MLV transformer 12 is rectified and is filtered, and converts alternating current to direct current
For the power supply of first voltage conversion module 15, first voltage conversion module 15 will be defeated from output end D2 after the voltage conversion of input terminal D1
Out；Second rectification filtering module 14 is knob brightness adjustment control mould after the voltage that MLV transformer 12 exports is rectified and filtered
Block 17 provides voltage, and second voltage conversion module 16 receives the control voltage signal of the offer of knob dimming controlling module 17, defeated
The driving current of corresponding control voltage signal out can adjust the size of output driving current according to control voltage signal, shine
Device changes brightness according to the size of output driving current.
Technical solution provided in an embodiment of the present invention, by using include MLV dimming controlling module 11, MLV transformer 12,
First rectification filtering module 13, the second rectification filtering module 14, first voltage conversion module 15,16 and of second voltage conversion module
The dimming drive power circuit of knob dimming controlling module 17, the first rectification filtering module 13 and the second rectification filtering module 14 divide
The other output voltage to MLV transformer 12 carries out rectifying and wave-filtering, is respectively 15 He of first voltage conversion module by obtained voltage
Knob dimming controlling module 17 is powered, and the signal of 17 output end of knob dimming controlling module output is adjustable, second voltage modulus of conversion
Block 16 adjusts output end output signal size according to the signal of control terminal, to drive the light emitting device light modulation of electrical connection.The present invention
The dimming drive power circuit of embodiment offer can be applied to MLV light modulation and knob light modulation simultaneously, strong with light modulation compatibility,
The advantages of dimming scope is wide, good dimming effect.
Optionally, Fig. 2 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention, reference
Fig. 2, the first rectification filtering module 13 include: full wave rectifier bridge stack BR1 and first capacitor C1, wherein full wave rectifier bridge stack BR1's
Input terminal is electrically connected with the output end of MLV transformer 12, the output end and first voltage conversion module 15 of full wave rectifier bridge stack BR1
Input terminal electrical connection, first capacitor C1 is parallel to the output end of rectifier bridge stack BR1.
Second rectification filtering module 14 includes: first diode D1 and the second diode D2；
The anode of the anode of first diode D1 and the second diode D2 respectively with the output end B2 of MLV transformer 12
Single port and second port electrical connection, the cathode of the cathode of first diode D1 and the second diode D2 with knob brightness adjustment control
The defeated end the F1 electrical connection of the first of module 17.
Specifically, the first rectification filtering module 13 and the second rectification filtering module 14 can be by diodes and capacitor structure
At alternating current is become unidirectional Rectified alternating current using the unilateal conduction performance of diode.First rectification filtering module 13 is complete
Wave rectification, is rectified, full wave rectifier bridge stack BR1 is made of in series and parallel four diodes by full wave rectifier bridge stack BR1；Second is whole
Stream filter module 14 is halfwave rectifier, and there are two diodes to constitute.In half period, electric current flows through a diode, and
In another half cycle, electric current flows through second diode, and the connection of two diodes can flow through their electric current with same
Flow through load in one direction.Rectification filtering module structure is simple, is easily integrated, and rectify using rectifier bridge stack and diode advantageous
In the cost for reducing driving power circuit.
Optionally, Fig. 3 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention, reference
Fig. 3, knob dimming controlling module 17 include the first bleeder circuit 171, first resistor R1, the first adjustable potentiometer VR1 and three poles
Pipe Q2；
The cathode of the first end of first adjustable potentiometer VR1 and the cathode of first diode D1 and the second diode D2 electricity
Connection, the second end of the first adjustable potentiometer VR1 are grounded by first resistor R1；
The control electrode F4 of triode Q2 is electrically connected with the output end of the first adjustable potentiometer VR1, the first pole of triode Q2
F5 is electrically connected with the output end D2 of first voltage conversion module 15, the second pole F6 of triode Q2 and the first bleeder circuit 171
First end electrical connection, the second end ground connection of the first bleeder circuit 171, the output end and second voltage of the first bleeder circuit 171 turn
Change the mold the control terminal G3 electrical connection of block 16.
Specifically, the first bleeder circuit 171, first resistor R1, the first adjustable potentiometer VR1 and triode Q2 form knob
The voltage of dimming controlling module 17, the output of the second rectification filtering module 14 passes through first resistor R1 and the first adjustable potentiometer VR1
Control electrode F4 after partial pressure for triode Q2 provides a low current, and to driving triode Q2, control electrode F4 receives partial pressure
While signal, continue to divide by the bleeder circuit 171 that the second pole F6 with triode Q2 is electrically connected, the first bleeder circuit
171 export voltage division signal to the control terminal G3 of second voltage conversion module 16, provide power supply for second voltage conversion module 16
Signal.Change the voltage value of 17 output end F3 of knob dimming controlling module by adjusting the resistance value of the first adjustable potentiometer VR1,
Achieve the effect that continuous light tuning.Triode Q2 is for amplifying output electric current, when the current potential of triode Q2 control electrode F4 is higher than first
PN junction positively biased when the current potential of pole F5, between triode Q2 control electrode F4 and the second pole F6；When the electricity of triode Q2 control electrode F4
When position is lower than the current potential of the first pole F5, the PN junction between triode Q2 control electrode F4 and the first pole F5 is reverse-biased, at this time in the first pole
A low current is given at F5, according to current continuity it is found that the electric current at the first pole F5 will will increase, in practical applications,
Often through resistance by the Current amplifier role transformation of triode be voltage amplification act on.
The technical solution of the embodiment of the present invention is passed through voltage signal by the cooperation of knob adjustable potentiometer and divider resistance
It crosses triode to amplify, exports the control ability for improving output signal to the control terminal of second voltage conversion module and steady
It is qualitative, be conducive to the signal that knob dimming controlling module 17 exports be that second voltage conversion module 16 matches.
Optionally, Fig. 4 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention, reference
Fig. 4, the second rectification filtering module 14 further include second resistance R2, the second capacitor C2 and zener diode ZD1；Wherein, the one two
The cathode of the cathode of pole pipe D1 and the second diode D2 pass through the first end electricity of second resistance R2 and the first adjustable potentiometer VR1
Connection；The first end of second capacitor C2 is electrically connected with the first end of the first adjustable potentiometer VR1, the second termination of the second capacitor C2
Ground；
Zener diode ZD1 is in parallel with the second capacitor C2；
First bleeder circuit 171 includes 3rd resistor R3 and the 4th resistance R4, and the first end of 3rd resistor R3 is as first
The first end of bleeder circuit 171, the second end of 3rd resistor R3 are electrically connected with the first end of the 4th resistance R4, and as first point
The output end of volt circuit 171, second end of the second end of the 4th resistance R4 as the first bleeder circuit 171.
Specifically, first diode D1 and the second diode D2 carries out the ac voltage signal that MLV transformer 12 exports
The cathode of rectification, the cathode of first diode D1 and the second diode D2 pass through second resistance R2 and the first adjustable potentiometer
The first end of VR1 is electrically connected, and second resistance R2 is connected between the input terminal E1 and output end E2 of the second rectification filtering module 14,
Play damping action.Second capacitor C2 is filtered commutation output signal, filtering clutter signal, the voltage letter after rectifying and wave-filtering
Number may not stable holding unify voltage value, for the voltage for protecting 16 control terminal G3 of second voltage conversion module to receive
Signal is no more than limit value, needs to carry out pressure stabilizing by output voltage of the zener diode ZD1 to the second rectification filtering module 14
Peak clipping.First bleeder circuit 171 is made of 3rd resistor R3 and the 4th resistance R4, for limiting the big of triode Q2 output electric current
It is small, while output current signal can also be converted into output voltage signal, control voltage is provided for second voltage conversion module.
The technical solution of the embodiment of the present invention by using second resistance R2, the second capacitor C2, zener diode ZD1 and
3rd resistor R3 and the 4th resistance R4 limits the output voltage of the second rectification filtering module 14 and knob dimming controlling module 17
Size protects second voltage conversion module 16 breakdown because of overtension, is conducive to improve dimming drive power
The stability and reliability of circuit.
Optionally, Fig. 5 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention, reference
Fig. 5, first voltage conversion module include: the first DC-DC chip U1, first switch tube Q1, the 5th resistance R5, the 6th resistance R6,
First inductance L1, third capacitor C3, third diode D3 and the second bleeder circuit 157；Wherein, the first DC-DC chip U1 includes
Voltage input end 5, current sampling input terminal 7, switching signal output end 1 and feedback voltage input terminal 2；
The voltage input end 5 of first DC-DC chip U1 is electrically connected with the output end C2 of the first current rectifying and wave filtering circuit 13, and the 5th
The first end of resistance R5 is electrically connected with voltage input end 5, the second end of the 5th resistance R5 and current sampling input terminal 7 and first
The first end of inductance L1 is electrically connected, and the second end of the first inductance L1 is electrically connected with the anode of third diode D3, and the three or two
The cathode of pole pipe D3 is electrically connected with the output end D2 of first voltage conversion module 15；
The control terminal of first switch tube Q1 is electrically connected by the 6th resistance R6 with switching signal output end 1, first switch tube
The first end of Q1 is electrically connected with the second end of the first inductance L1, the second end ground connection of first switch tube Q1；
The first end of second bleeder circuit 157 is electrically connected with the second end of the first inductance L1, and the of the second bleeder circuit 157
Two ends ground connection, the output end of the second bleeder circuit 157 are electrically connected with feedback voltage input terminal 2；
The first end of third capacitor C3 is electrically connected with the cathode of third diode D3, the second end ground connection of third capacitor C3；
Second bleeder circuit 157 includes the 7th resistance R7 and the 8th resistance R8；
First end of the first end of 7th resistance R7 as the second bleeder circuit 157, the second end of the 7th resistance R7 and the
The first end of eight resistance R8 is electrically connected the output end as the second bleeder circuit 157, and the second end of the 8th resistance R8 is as second
The second end of bleeder circuit 157.
Specifically, the first DC-DC chip U1 is boost conversion chip, for realizing the conversion of voltage, the first DC-DC chip
The voltage input end 5 of U1 provides voltage by the first rectification filtering module 13, and the 5th resistance R5 is detection resistance, for being arranged first
The maximum output current of DC-DC chip U1 passes through the first inductance L1, third capacitor C3, third diode D3 and first switch tube
Q1 realizes boost conversion.For example, the alternating voltage of the output of MLV transformer 12 becomes direct current after the first rectification filtering module 13
Electricity, when first switch tube Q1 is opened, d. c. voltage signal carries out energy storage by the first inductance L1, the electric current on the first inductance L1 with
Certain ratio is linearly increasing, this ratio is related with the first inductance L1 size, as inductive current increases, stores in inductance
Some energy, while the voltage on third capacitor C3 powers to the load；When first switch tube Q1 is turned off, the first inductance L1 discharges energy
Amount, i.e. the first inductance L1 start to charge to third capacitor C3, and third capacitor C3 both end voltage increases, and voltage is already higher than defeated at this time
Enter voltage, boosting finishes.Third capacitor C3 is the electrolytic capacitor of large capacity, to the output signal of the first DC-DC chip U1 into
Row filtering, reduces the ripple of output voltage, guarantees the stability that second voltage conversion module 16 inputs.
The technical solution of the embodiment of the present invention realizes the conversion of voltage by the first DC-DC chip U1, passes through control first
Switching tube Q1's turns on and off, and realizes boost process.First switch tube Q1 is external n type field effect transistor, it is possible to reduce
The power loss of field effect transistor built in first DC-DC chip U1 is conducive to improve delivery efficiency.
Optionally, Fig. 6 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention, reference
Fig. 6, second voltage conversion module 16 include: the 2nd DC-DC chip U2, the 9th resistance R9, the tenth resistance R10, the second adjustable electric
Position device VR2, the 4th diode D4, the 4th capacitor C4 and the second inductance L2；Wherein, the 2nd DC-DC chip U2 includes voltage input
End 5, drive output 1, first switch control output end 7, second switch control output end 8 and control terminal 4；
The cathode of the voltage input end 5 of 2nd DC-DC chip U2 and the 4th diode D4 with first voltage conversion module
15 output end D2 electrical connection, the anode of the 4th diode D4 are electrically connected with second switch control output end 8；
The voltage input of the first end of 9th resistance R9 and the first end of the tenth resistance R10 with the 2nd DC-DC chip U2
5 electrical connection of end, the second end of the tenth resistance R10 is electrically connected with drive output 1, the second end of the 9th resistance R9 and second adjustable
The first end of potentiometer VR2 is electrically connected, and the second end of the second adjustable potentiometer VR2 is hanging, the output of the second adjustable potentiometer VR2
End be electrically connected with the second end of the tenth resistance R10, drive output 1 as 16 output end G2 of second voltage conversion module first
Port；
The control terminal 4 of 2nd DC-DC chip U2 is electrically connected with the output end F3 of knob dimming controlling module 17；
The first end of second inductance L2 is electrically connected with first switch control output end 7, the second end conduct of the second inductance L2
The second port of 16 output end G2 of second voltage conversion module；
4th capacitor C4 is parallel to the output end of second voltage conversion module 16.
Specifically, the 2nd DC-DC chip U2 is the decompression chip of built-in field effect transistor, it is internally integrated decompression conversion
Circuit, for carrying out the conversion of voltage, to realize the adjusting to output electric current.2nd DC-DC chip U2 obtains voltage input end 5
It is powered by the output end D2 of first voltage conversion module 15, passes through the 9th resistance R9, the tenth resistance R10 and the second adjustable potentiometer
The output current value of the 2nd DC-DC chip U2 drive output 1 is arranged in VR2, which is used to that light emitting device to be driven to shine,
Different brightness can be corresponded to according to the difference of output current value.When the forward voltage drop value of light emitting device differs greatly, can lead to
The second adjustable potentiometer VR2 fine adjustment output current value is crossed, the size of lamp power outputs can be precisely controlled, realizes precisely control
Light.Realize that decompression turns by field effect transistor built in the 2nd DC-DC chip U2 and the second inductance L2 and the 4th diode D4
It changes, the control terminal 4 of the 2nd DC-DC chip U2 exports the current signal of corresponding control signal according to the control signal received, real
Now to the adjusting of the output current value of drive output 1, control terminal 4 receives the voltage value of control signal in 0.1V~2.5V
When, 0~100% gamut light modulation may be implemented.
The technical solution of the embodiment of the present invention, the control that the control terminal 4 by controlling the 2nd DC-DC chip U2 receives are believed
Number size adjusts the output current value of drive output 1 in real time, realizes 0~100% gamut light modulation, can also pass through second
Adjustable potentiometer VR2 fine adjustment output current value is accomplished precisely to control light.
Optionally, Fig. 7 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention, reference
Fig. 7, dimming drive power circuit further include surge absorption module, the first rectification filtering module 13 and the second rectification filtering module
14 are electrically connected by surge absorption module 18 with the output end B2 of MLV transformer 12, and surge absorption module 18 is for absorbing surging.
In practical applications, there can be biggish surging by the voltage that MLV transformer exports, sudden-wave absorbing mould can be passed through
Block 18 absorbs surging, keeps the input voltage of the first rectification filtering module 13 and the second rectification filtering module 14 steady
Voltage, to protect the subsequent circuit of system.Surge absorption module 18 can react the abnormal voltage on route, sponge big
The surging energy of part, while abnormal voltage, which is suppressed to safe range, improves the safety of route and stability.
Optionally, Fig. 8 is the structural schematic diagram of another dimming drive power circuit provided in an embodiment of the present invention, reference
Fig. 8, including MLV dimming controlling module 11, MLV transformer 12, the first rectification filtering module 13, the second rectification filtering module 14,
First voltage conversion module 15, second voltage conversion module 16, knob dimming controlling module 17 and surge absorption module 18；
Surge absorption module 18 includes fuse F1 and varistor MVR；
The first end of fuse F1 is electrically connected with the first port of 12 output end of MLV transformer, the second end of fuse F1
It is electrically connected with the input terminal of full wave rectifier bridge stack BR1；The first end of varistor MVR is electrically connected with the second end of fuse F1,
The second end of varistor MVR is electrically connected with the second port of 12 output end of MLV transformer.
The input terminal of MLV dimming controlling module 11 for input AC electricity, the output end of MLV dimming controlling module 11 with
The input terminal of MLV transformer 12 is electrically connected；
The input terminal of first rectification filtering module 13 is electrically connected with the output end of MLV transformer 12, the first rectifying and wave-filtering mould
The output end of block 13 is electrically connected with the input terminal of first voltage conversion module 15, and first voltage conversion module 15 is used for input terminal
Voltage conversion after from output end export；
The input terminal of second voltage conversion module 16 is electrically connected with the output end of first voltage conversion module 15, second voltage
The output end of conversion module 16 is used to be adjusted according to the signal of control terminal for connecting light emitting device, second voltage conversion module 16
Output end output signal size, to drive the light emitting device light modulation of electrical connection；
The input terminal of second rectification filtering module 14 is electrically connected with the output end of MLV transformer 12, the second rectifying and wave-filtering mould
The output end of block is electrically connected with the first input end of knob dimming controlling module 17；
Second input terminal of knob dimming controlling module 17 is electrically connected with the output end of first voltage conversion module 15, knob
The output end of dimming controlling module 17 is electrically connected with the control terminal of second voltage conversion module 16, and 17 pieces of knob brightness adjustment control mould is defeated
The signal of outlet output is adjustable；
First rectification filtering module 13 and the second rectification filtering module 14 pass through surge absorption module 18 and MLV transformer
12 output end electrical connection, surge absorption module 18 is for absorbing surging.
The specific working principle is as follows for the dimming drive power circuit:
Electric main is converted into 9~15V of low-voltage AC by MLV dimming controlling module 11 and MLV transformer 12, is used for
MLV light modulation；The voltage signal that MLV transformer 12 exports absorbs surging by fuse F1 and varistor MVR, protects subsequent
Route；First rectification filtering module 13 is full-wave rectifier filter circuit, full-wave rectification is carried out by rectifier bridge stack BR1, after rectification
It is filtered through first capacitor C1, ensure that the High Power Factor of input voltage, the capacitance of first capacitor C1 is less than 10uF；First voltage
Conversion module 15 is BOOST (boosting) voltage conversion circuit of a DC-DC, passes through the 7th capacitor C7 of the 6th capacitor C6 setting the
The working frequency of one DC-DC chip U1, the first DC-DC chip U1 can be the DC-DC conversion chip of AP34063 model.Pass through
Maximum output current is arranged in 5th resistance R5, divides feedback inspection by the 6th diode D6, the 7th resistance R7 and the 8th resistance R8
Output voltage values are set as DC voltage 30V by slowdown monitoring circuit, pass through the first inductance L1, first switch tube Q1 and third diode D3
Realize the conversion of BOOST voltage, first switch tube Q1 can reduce the power consumption of the first DC-DC chip U1, improve output power, Zhi Houtong
It crosses a big capacity electrolyte capacitor C3 to be filtered boost voltage to reduce output ripple, guarantees the steady of rear stage circuit input
It is qualitative, it improves efficiency.Second voltage conversion module 16 is the STEP controlled by the 2nd DC-DC chip U2 of a built-in switch pipe
DOWN (decompression) conversion circuit, the 2nd DC-DC chip U2 can be the DC-DC conversion chip of AL8807 model, pass through the 9th electricity
It hinders R9, the tenth resistance R10 and the second adjustable potentiometer VR2 and output current value is set, this exports electric current and powers to light emitting device, hair
Electro-optical device can be LED load, can be micro- by the second adjustable potentiometer VR2 when the forward voltage drop value of LED load differs greatly
Output electric current is adjusted, the performance number size of whole lamps and lanterns output can be precisely controlled, and accomplishes precisely to control light, the 4th capacitor is connected in parallel on the
The output end of two voltage transformation modules 16 filters output voltage, and the bypass that the 8th capacitor C8 is the 2nd DC-DC chip U2 filters
Capacitor, circuit realize voltage STEP DOWN conversion by the 4th diode D4 and the second inductance L2.Second rectification filtering module 14
It is halfwave rectifier filter circuit, is made of first diode D1, the second diode D2, second resistance R2 and the second capacitor C2,
Middle first diode D1, the second diode D2 constitute half-wave rectifying circuit, by the ac voltage rectifier of input at DC voltage, the
Two resistance R2 play damping action, and the second capacitor C2 is for filtering.Knob dimming controlling module 17 passes through the first adjustable potentiometer
VR1 and first resistor R1 partial pressure, signal are supplied to one partial pressure electricity of NPN triode Q2 base stage after the 9th capacitor C9 filtering delay-time
Pressure value, while second is supplied to after dividing by the emitter of NPN triode Q2 using 3rd resistor R3 and the 4th resistance R4
One control voltage signal of control pin of DC-DC chip U2, the control pin of the 2nd DC-DC chip U2 receives control signal will
By the fixed STEP DOWN conversion circuit operation in inside to realize the function that output electric current is adjusted, two pole of pressure stabilizing
Pipe ZD1 is used for pressure stabilizing peak clipping, prevents the control pin voltage of the 2nd DC-DC chip U2 from being protected beyond limit value.
Knob light modulation is divided by the first adjustable potentiometer VR1 to change the electricity that the 2nd DC-DC chip U2 controls pin
Voltage-controlled system realizes that light modulation, MLV light modulation are that the signal after cut phase is passed through the second rectification filtering module 14 and knob brightness adjustment control mould
Block 17 changes the electricity of the control pin of the 2nd DC-DC chip U2 with the average voltage after variation to the base stage of NPN triode Q2
Pressure value realizes the control to the 2nd DC-DC chip U2 output electric current, to realize that MLV is dimmed.MLV light modulation and knob light modulation are all
The voltage value that the control pin of the 2nd DC-DC chip U2 need to be changed by knob dimming controlling module, is realized to the 2nd DC-DC
Chip U2 exports the control of electric current, to realize light modulation, the voltage value for controlling pin can realize 0- in 0.1~2.5V of section
100% dimming scope.
Dimming drive power circuit provided in an embodiment of the present invention can be applied to MLV light modulation and knob light modulation, tool simultaneously
There is the advantages of light modulation compatibility is strong, dimming scope is wide, good dimming effect, Low Drift Temperature.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of dimming drive power circuit, which is characterized in that including electromagnetic type low pressure MLV dimming controlling module, MLV transformation
Device, the first rectification filtering module, the second rectification filtering module, first voltage conversion module, second voltage conversion module and knob
Dimming controlling module；
The input terminal of the MLV dimming controlling module for input AC electricity, the output end of the MLV dimming controlling module with
The input terminal of the MLV transformer is electrically connected；
The input terminal of first rectification filtering module is electrically connected with the output end of the MLV transformer, the first rectification filter
The output end of wave module is electrically connected with the input terminal of the first voltage conversion module, and the first voltage conversion module is used for will
It is exported after the voltage conversion of input terminal from output end；
The input terminal of the second voltage conversion module is electrically connected with the output end of the first voltage conversion module, and described second
The output end of voltage transformation module is used for the signal according to control terminal for connecting light emitting device, the second voltage conversion module
Output end output signal size is adjusted, to drive the light emitting device light modulation of electrical connection；
The input terminal of second rectification filtering module is electrically connected with the output end of the MLV transformer, the second rectification filter
The output end of wave module is electrically connected with the first input end of the knob dimming controlling module；
Second input terminal of the knob dimming controlling module is electrically connected with the output end of the first voltage conversion module, described
The output end of knob dimming controlling module is electrically connected with the control terminal of the second voltage conversion module, the knob brightness adjustment control
The signal of module output end output is adjustable.
2. dimming drive power circuit according to claim 1, which is characterized in that
First rectification filtering module includes: full wave rectifier bridge stack and first capacitor, wherein the full wave rectifier bridge stack it is defeated
Enter end to be electrically connected with the output end of the MLV transformer, the output end of the full wave rectifier bridge stack and the first voltage are converted
The input terminal of module is electrically connected, and the first capacitor is parallel to the output end of the rectifier bridge stack.
3. dimming drive power circuit according to claim 1, which is characterized in that
Second rectification filtering module includes: first diode and the second diode；
The anode of the anode of the first diode and second diode respectively with the output end of the MLV transformer
Single port and second port electrical connection, the cathode of the cathode of the first diode and second diode with the knob
The first input end of dimming controlling module is electrically connected.
4. dimming drive power circuit according to claim 3, which is characterized in that
The knob dimming controlling module includes the first bleeder circuit, first resistor, the first adjustable potentiometer and triode；
The cathode of the first end of first adjustable potentiometer and the cathode of the first diode and second diode
Electrical connection, the second end of first adjustable potentiometer are grounded by the first resistor；
The control electrode of the triode is electrically connected with the output end of first adjustable potentiometer, the first pole of the triode with
The output end of the first voltage conversion module is electrically connected, the second pole of the triode and the first end electricity of the bleeder circuit
Connection, the second end ground connection of first bleeder circuit, the output end of first bleeder circuit and the second voltage are converted
The control terminal of module is electrically connected.
5. dimming drive power circuit according to claim 4, which is characterized in that second rectification filtering module also wraps
Include second resistance, the second capacitor and zener diode；Wherein, the yin of the cathode of the first diode and second diode
Extremely it is electrically connected by the second resistance with the first end of first adjustable potentiometer；The first end of second capacitor with
The first end of first adjustable potentiometer is electrically connected, the second end ground connection of second capacitor；
The zener diode is in parallel with second capacitor；
First bleeder circuit includes 3rd resistor and the 4th resistance, and the first end of the 3rd resistor is as described first point
The first end of volt circuit, the second end of the 3rd resistor are electrically connected with the first end of the 4th resistance, and as described
The output end of one bleeder circuit, second end of the second end of the 4th resistance as first bleeder circuit.
6. dimming drive power circuit according to claim 1, which is characterized in that the first voltage conversion module packet
Include: the first DC-DC chip, first switch tube, the 5th resistance, the 6th resistance, the first inductance, third capacitor, third diode and
Second bleeder circuit；Wherein, the first DC-DC chip includes voltage input end, current sampling input terminal, switching signal output
End and feedback voltage input terminal；
The voltage input end of the first DC-DC chip is electrically connected with the output end of first current rectifying and wave filtering circuit, and described
The first end of five resistance is electrically connected with the voltage input end, the second end of the 5th resistance and the current sampling input terminal
And the first end electrical connection of first inductance, the second end of first inductance and the anode of the third diode are electrically connected
It connects, the cathode of the third diode is electrically connected with the output end of the first voltage conversion module；
The control terminal of the first switch tube is electrically connected by the 6th resistance with the switching signal output end, and described first
The first end of switching tube is electrically connected with the second end of second inductance, the second end ground connection of the first switch tube；
The first end of second bleeder circuit is electrically connected with the second end of first inductance, and the of second bleeder circuit
Two ends ground connection, the output end of the second bleeder circuit are electrically connected with the feedback voltage input terminal；
The first end of the third capacitor is electrically connected with the cathode of the third diode, the second termination of the third capacitor
Ground.
7. dimming drive power circuit according to claim 6, which is characterized in that second bleeder circuit includes the 7th
Resistance and the 8th resistance；
First end of the first end of 7th resistance as second bleeder circuit, the second end of the 7th resistance and institute
State output end of the first end electrical connection of the 8th resistance as second bleeder circuit, the second end conduct of the 8th resistance
The second end of second bleeder circuit.
8. dimming drive power circuit according to claim 1, which is characterized in that the second voltage conversion module packet
It includes: the 2nd DC-DC chip, the 7th resistance, the 8th resistance, the second adjustable potentiometer, the 4th diode, the 4th capacitor and the second electricity
Sense；Wherein, the 2nd DC-DC chip includes voltage input end, drive output, first switch control output end, second opens
Close control output end and control terminal；
The cathode of the voltage input end of the 2nd DC-DC chip and the 4th diode with the first voltage modulus of conversion
The output end of block is electrically connected, and the anode of the 4th diode is electrically connected with the second switch control output end；
The voltage input of the first end of 7th resistance and the first end of the 8th resistance with the 2nd DC-DC chip
End electrical connection, the second end of the 8th resistance are electrically connected with the drive output, the second end of the 7th resistance and institute
The first end electrical connection of the second adjustable potentiometer is stated, the second end of second adjustable potentiometer is hanging, second adjustable electric
The output end of position device is electrically connected with the second end of the 8th resistance, and the drive output is defeated as second voltage conversion module
The first port of outlet；
The control terminal of the 2nd DC-DC chip is electrically connected with the output end of the knob dimming controlling module；
The first end of second inductance is electrically connected with the first switch control output end, and the second end of second inductance is made
For the second port of the second voltage conversion module output end；
4th capacitor is parallel to the output end of the second voltage conversion module.
9. dimming drive power circuit according to claim 1, which is characterized in that further include surge absorption module；
First rectification filtering module and second rectification filtering module pass through the surge absorption module and the MLV
The output end of transformer is electrically connected, and the surge absorption module is for absorbing surging.
10. dimming drive power circuit according to claim 8, which is characterized in that the surge absorption module includes protecting
Dangerous silk and varistor；
The first end of the fuse is electrically connected with the first port of the MLV transformer output end, and the second of the fuse
End is electrically connected with the input terminal of the full wave rectifier bridge stack；
The first end of the varistor is electrically connected with the second end of the fuse, the second end of the varistor with it is described
The second port of MLV transformer output end is electrically connected.
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| CN201910493484.0A CN110225617B (en) | 2019-06-06 | 2019-06-06 | Dimming driving power circuit |
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| CN203590552U (en) * | 2013-11-11 | 2014-05-07 | 深圳市九洲光电科技有限公司 | Dimmable drive circuit used for LED MR16 spotlight |
| US20140300275A1 (en) * | 2008-11-25 | 2014-10-09 | Lutron Electronics Co., Inc. | Control Device for Providing A Visual Indication of Energy Savings and Usage Information |
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|---|---|---|---|---|
| CN101584249A (en) * | 2006-03-17 | 2009-11-18 | 路创电子公司 | Dimmer for preventing asymmetric current flow through an unloaded magnetic low-voltage transformer |
| US20140300275A1 (en) * | 2008-11-25 | 2014-10-09 | Lutron Electronics Co., Inc. | Control Device for Providing A Visual Indication of Energy Savings and Usage Information |
| CN101827486A (en) * | 2010-03-31 | 2010-09-08 | 苏州达方电子有限公司 | Light tube module |
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