CN109302777A - LED dimming device and light adjusting system - Google Patents
LED dimming device and light adjusting system Download PDFInfo
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- CN109302777A CN109302777A CN201811490642.9A CN201811490642A CN109302777A CN 109302777 A CN109302777 A CN 109302777A CN 201811490642 A CN201811490642 A CN 201811490642A CN 109302777 A CN109302777 A CN 109302777A
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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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a kind of LED dimming device and light adjusting systems, LED dimming device includes power circuit, LED light group and driving circuit, driving circuit includes pressure drop circuit, reference voltage circuit, control circuit, first switch, second switch, third switch and the first current source, control circuit receives pwm signal, and pwm signal exports being switched on or off for the first logical signal control first switch based on the received, the disconnection or conducting of the second logical signal control second switch are exported simultaneously, first switch and second switch are positive Reverse Turning Control, conducting when third switch receives preset reference voltage value, and in first switch conducting, change the current value of output according to the first logical signal, first current source is when second switch is connected, output draws high voltage to third and switchs, accelerate the controlled end of third switch Rate of voltage rise.The switching voltage of LED dimming device rises slower problem when the present invention is able to solve PWM light modulation in the prior art.
Description
Technical field
The present invention relates to intellectualized LEDs to dim field, in particular to a kind of LED dimming device and light adjusting system.
Background technique
LED (Light-Emitting Diode, light emitting diode) is widely used in existing society, white light LEDs
Energy consumption is only the 1/10 of incandescent lamp, has long service life, is tradition specifically using the time up to 50000 hours or more
50 times or more of tengsten lamp, and LED light pollutes environment heavy metal free without containing heavy metal elements such as lead or mercury.Due to LED
The reasons such as the standby green of lamps and lanterns, environmental protection, energy conservation and long service life are loved by consumers, and country also encourages to replace using LED light
For traditional incandescent lamp and energy-saving lamp.
The driving chip design of LED light is broadly divided into the driving of Switching Power Supply class and linear constant current driving two major classes, switch
Power supply class advantage is that line regulation and load regulation are relatively good, therefore high-efficient, and disadvantage is Switching Power Supply class system
Complexity, volume is big and cost of manufacture is relatively high, and the shortcomings that linear constant current driving class is line regulation and load regulation
Limited, efficiency is low compared to Switching Power Supply class driving class, and advantage has higher PF (Power without inductance is used
Factor, power factor) value, also without EMI (Electromagnetic Interference, electromagnetic interference) problem, system
It is at low cost using simple.Nowadays the LED illumination in China is more and more cheaper, is chasing in the market of cost, linear constant current driving
Scheme is liked and is approved by more and more LED light manufacturers.
Country's linear constant current class driving at present is broadly divided into light modulation class and non-dimmable class, and light modulation class is presently mainly use can
Control silicon is dimmed, but with the development of intelligent lighting, LED linear constant current driving need to cooperate bluetooth, wifi and other
Communication module uses, so need that the brightness of pulse-width regulated function point analysis and colour temperature is added in linear constant current driving, and it is existing
Depth is dimmed generally in 5%-7%.
Summary of the invention
The main object of the present invention is to provide a kind of LED dimming device, it is intended to solve LED when PWM is dimmed in the prior art
The switching voltage of dimming device rises slower technical problem.
To achieve the above object, the present invention provides a kind of LED dimming device, including power circuit, LED light group and driving electricity
Road, the driving circuit include pressure drop circuit, reference voltage circuit, control circuit, first switch, second switch, third switch
With the first current source；
The power circuit, for providing working power for the LED light group；
The pressure drop circuit, for being provided for the control circuit, the reference voltage circuit and first current source
Operating voltage；
The reference voltage circuit, for exporting preset reference voltage；
The control circuit, for receiving pwm signal, and based on the received, pwm signal exports the control of the first logical signal
The first switch is switched on or off, while being exported the second logical signal and being controlled the disconnection of the second switch or lead
Logical, the first switch and the second switch are positive Reverse Turning Control；
The third switch, conducting when for receiving the preset reference voltage value, and led in the first switch
When logical, change the current value of output according to first logical signal；
First current source, in second switch conducting, output to draw high voltage to the third and switchs, and adds
The rate of voltage rise of the controlled end of fast third switch.
Optionally, the control circuit includes power input, control signal input, the first output end and the second output
End, the output end of the power circuit are connect with the input terminal of the LED light group, the output end of the LED light group, the pressure drop
The first end interconnection of the input terminal of circuit and third switch, the connecting node that the pressure drop circuit is switched with the third are
The input terminal of the driving circuit, the output end of the pressure drop circuit, the input terminal of the reference voltage circuit, control electricity
The interconnection of the input terminal of the power input on road and first current source；The control signal input of the control circuit and outside
Equipment connection is controlled, the first output end of the control circuit is connect with the controlled end of the first switch, the control circuit
Second output terminal connect with the controlled end of the second switch；The output end of the reference voltage circuit, the first switch
First end, the first end of the second switch and the third switch controlled end interconnection, the second end of the first switch
For the ground terminal of the driving circuit；The second end of the second switch is connect with the output end of first current source；It is described
The second end of third switch is the output end of the driving circuit.
Optionally, the driving circuit is integrated on driving chip.
Optionally, the LED dimming device further includes ground resistance, the output end of the driving circuit and ground connection electricity
The first end of resistance connects, the second end ground connection of the ground terminal of the driving circuit and the ground resistance.
Optionally, the pressure drop circuit includes field-effect tube and internal electric source generator, and the grid of the field-effect tube connects
Ground, the drain electrode of the field-effect tube are the input terminal of the pressure drop circuit, the source electrode of the field-effect tube and the internal electric source
The input terminal of generator connects, and the output end of the internal electric source generator is the output end of the pressure drop circuit.
Optionally, the reference voltage circuit includes band-gap reference device, the first operational amplifier and the second current source, described
The connection of the input terminal of the input terminal of band-gap reference device and second current source, the band-gap reference device and second current source
Connecting node be the reference voltage circuit input terminal, the output end of the band-gap reference device and first operation amplifier
The positive input of device connects；The output end of second current source is connect with the power end of first operational amplifier, institute
The reverse input end for stating the first operational amplifier is connect with the second end that the third switchs, first operational amplifier it is defeated
Outlet is the output end of the reference voltage circuit.
Optionally, the control circuit include Schmitt trigger, the first phase inverter, the second phase inverter, third phase inverter,
4th phase inverter, the 5th phase inverter, hex inverter, third current source, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor,
Four metal-oxide-semiconductors, first capacitor and NAND gate, the input terminal of the Schmitt trigger are that the control signal of the control circuit inputs
End, the output end of the Schmitt trigger are connect with the input terminal of first phase inverter；The output of first phase inverter
End is connect with the input terminal of second phase inverter, the input terminal of the output end of second phase inverter and the third phase inverter
Connection；The output end of the third phase inverter, the input terminal of the hex inverter, the first input end of the NAND gate, institute
State the grid of the first metal-oxide-semiconductor and the gate interconnection of second metal-oxide-semiconductor；The source electrode of first metal-oxide-semiconductor is the control circuit
Power input, the drain electrode of first metal-oxide-semiconductor, the drain electrode of second metal-oxide-semiconductor, the first end of the first capacitor and institute
State the input terminal interconnection of the 4th phase inverter；The source electrode of second metal-oxide-semiconductor is connect with the drain electrode of the third metal-oxide-semiconductor, and described
The source electrode of three metal-oxide-semiconductors, the substrate of the second metal-oxide-semiconductor, the source electrode of the 4th metal-oxide-semiconductor and the second end of the first capacitor connect
Ground, the grid of the third metal-oxide-semiconductor, the grid of the 4th metal-oxide-semiconductor, the drain electrode of the 4th metal-oxide-semiconductor and the third electric current
The output end in source connects；The input terminal of the third current source is connect with the output end of the pressure drop circuit；6th reverse phase
The output end of device is the first output end of the control circuit；The output end of 4th reverser and the 5th reverser
Input terminal connection, the output end of the 5th reverser connect with the second input terminal of the NAND gate, the NAND gate it is defeated
Outlet is the second output terminal of the control circuit.
Optionally, the first switch and third switch are that N-MOS is managed, and the second switch is P-MOS pipe.
To achieve the above object, the present invention also provides a kind of light adjusting systems, including multiple LED light modulation dresses as described above
It sets, multiple LED dimming devices are arranged in parallel.
Optionally, the input terminal of the control circuit of multiple LED dimming devices is set with one/multiple external controls
Standby connection, the control circuit of multiple LED dimming devices receive identical/different pwm signal.
A kind of LED dimming device proposed by the present invention, including power circuit, LED light group and driving circuit, the driving electricity
Road includes pressure drop circuit, reference voltage circuit, control circuit, first switch, second switch, third switch and the first current source.
Wherein, the power circuit provides working power for the LED light group, and the pressure drop circuit is the control circuit, the base
Quasi- potential circuit and first current source provide operating voltage.The reference voltage circuit exports preset reference voltage.Institute
Stating control circuit, the first logical signal of pwm signal output controls being switched on or off for the first switch based on the received, together
When export the disconnection or conducting that the second logical signal controls the second switch, wherein the first switch and described second
The Reverse Turning Control that is positive is switched, i.e., when the first switch is connected, the second switch is disconnected or the first switch disconnects
When, the second switch conducting.Then, conducting when the third switch receives the preset reference voltage value, at this point,
LED dimming device is in current constant control state.And in first switch conducting, changed according to first logical signal defeated
Current value out, it is possible thereby to realize that PWM is dimmed.First current source, in second switch conducting, output to be drawn
Up voltage to the third switchs, and accelerates the rate of voltage rise of the controlled end of third switch, when so as to solve PWM light modulation
The switching voltage of LED dimming device rises slower problem, and the switching voltage of LED dimming device rises when accelerating PWM light modulation
Speed realizes intelligent dimming to deepen the light modulation depth of LED dimming device.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the module diagram of LED dimming device of the invention；
Fig. 2 is the circuit diagram of LED dimming device of the invention；
Fig. 3 is pwm signal, the first logical signal and the second logic in an embodiment of LED dimming device of the invention
The contrast schematic diagram of signal；
Fig. 4 is the effect diagram for promoting voltage and rising in an embodiment of LED dimming device of the invention；
Fig. 5 is the circuit diagram of the control circuit of LED dimming device of the invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and should not be understood as referring to
Show or imply its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " are defined as a result,
Two " feature can explicitly or implicitly include at least one of the features.In addition, the technical solution between each embodiment can
It to be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solution occurs
Conflicting or cannot achieve when, will be understood that the combination of this technical solution is not present, also not the present invention claims protection model
Within enclosing.
The switching voltage of LED dimming device rises slower when to solve the problems, such as existing PWM light modulation, and the present invention provides one kind
LED dimming device.It can be applied to the intelligentized control methods LED field such as intelligent distant control, human body sensing, acoustic control.
As shown in Figure 1,3, a kind of LED dimming device, including power circuit 101, LED light group 102 and driving circuit 103,
The driving circuit 103 includes pressure drop circuit 1031, reference voltage circuit 1032, control circuit 1033, first switch 1036, the
Two switches 1035, third switch 1037 and the first current source 1034.Control circuit 1033 is defeated including power input, control signal
Enter end, the first output end and second output terminal, the output end of power circuit 101 to connect with the input terminal of LED light group 102, LED light
The first end of the output end of group 102, the input terminal of pressure drop circuit 1031 and third switch 1037 interconnects, pressure drop circuit 1031 and the
The connecting node of three switches 1037 is the input terminal IN of driving circuit 103, output end, the reference voltage circuit of pressure drop circuit 1031
The input terminal of 1032 input terminal, the power input of control circuit 1033 and the first current source 1034 interconnects.Control circuit
1033 control signal input is connect with external control devices, the first output end and first switch 1036 of control circuit 1033
Controlled end connection, the second output terminal of control circuit 1033 connect with the controlled end of second switch 1035.Reference voltage circuit
1032 output end, the first end of first switch 1036, the first end of second switch 1035 and third switch 1037 controlled end
Interconnection, the second end of first switch 1036 are the ground terminal GND of driving circuit 103.The second end of second switch 1035 and first
The output end of current source 1034 connects；The second end of third switch 1037 is the output end ISET of driving circuit 103.
Wherein, power circuit 101 is that LED light group 102 provides working power, pressure drop circuit 1031 be control circuit 1033,
Reference voltage circuit 1032 and the first current source 1034 provide operating voltage, and operating voltage herein is that working power flows through LED
After lamp group 102 again through pressure drop circuit 1031 decompression after voltage.Meanwhile reference voltage circuit 1032 exports preset benchmark electricity
Pressure, control circuit 1033 based on the received pwm signal export the first logical signal DIMN control first switch 1036 conducting or
Person disconnect, while export the second logical signal DIMP control second switch 1035 disconnection or conducting, first switch 1036 with
Second switch 1035 is positive Reverse Turning Control, i.e., when the first switch 1036 is connected, the second switch 1035 is disconnected, Huo Zhesuo
When stating the disconnection of first switch 1036, the second switch 1035 is connected.Third switch 1037 can receive preset benchmark
It is connected when voltage value, LED dimming device is in current constant control state at this time.And when first switch 1036 is connected, according to first
Logical signal DIMN changes the current value of output, and third switch 1037 can adjust output according to the variation of pwm signal at this time
Current value carries out PWM light modulation to LED light group 102.Finally, the first current source 1034 is exported when second switch 1035 is connected
It draws high voltage and is increased corresponding to third switch 1037 to accelerate the rate of voltage rise of the controlled end of third switch 1037
Third switch 1037 export current value duty ratio, further deepened the light modulation depth of LED dimming device, according to test
Light modulation depth can be promoted to 1% from existing 5%-7% by statistics.
Optionally, control circuit 1033 includes logic controller 10331.
Optionally, as shown in Fig. 2, driving circuit 103 is integrated on driving chip.
Wherein, driving circuit 103 is integrated in driving chip can reduce volume, and increase the stability of circuit simultaneously,
Luggage is matched again after can individually producing, and facilitates production, convenient transportation and is individually sold, and user can be given biggish independently
Property, it can according to need the driving chip for selecting indefinite number, as the new LED dimming device of baseline configuration, and simultaneously not only
The LED dimming device being limited only in above-described embodiment.
Optionally, LED dimming device further includes ground resistance R1, the output end ISET and ground resistance of driving circuit 103
The first end of R1 connects, the second end ground connection of the ground terminal GND and ground resistance R1 of driving circuit 103.
Wherein, ground resistance R1 can provide a pressure drop to third switch 1037, make third switch 1037 direct
Ground connection thereby may be ensured that third switch 1037 works normally.
Optionally, pressure drop circuit 1031 includes field-effect tube J1 and internal electric source generator 10311, the grid of field-effect tube J1
Pole ground connection, the drain electrode of field-effect tube J1 are the input terminal of pressure drop circuit 1031, and the source electrode and internal electric source of field-effect tube J1 occurs
The input terminal of device 10311 connects, and the output end of internal electric source generator 10311 is the output end of pressure drop circuit 1031.
Wherein, sizeable field-effect tube J1 is selected, guarantees that the voltage of field-effect tube J1 input is greater than field-effect certainly
The truncation voltage of pipe J1, therefore, field-effect tube J1 will disconnect after rising to truncation voltage, be truncated then be connected again after in output
It is disconnected after voltage, repeatedly, guarantees that output to the voltage of internal electric source generator 10311 is a lesser constant voltage
Value, plays the effect of decompression, then provides the operating voltage of constant magnitude for subsequent related circuit, so that entire circuit has
Stable operating voltage keeps on the go.
Optionally, reference voltage circuit 1032 includes band-gap reference device 10321, the first operational amplifier OP and the second electric current
The input terminal of source IB2, the input terminal of band-gap reference device 10321 and the second current source IB2 connects, band-gap reference device 10321 and the
The connecting node of two current source IB2 is the input terminal of benchmark potential circuit 1032, the output end of band-gap reference device 10321 and first
The positive input of operational amplifier OP connects；The power end of the output end of second current source IB2 and the first operational amplifier OP
Connection, the reverse input end of the first operational amplifier OP are connect with the second end of third switch 1037, the first operational amplifier OP
Output end be benchmark potential circuit 1032 output end.
Wherein, band-gap reference device 10321 provides the reference voltage not varied with temperature for the first operational amplifier OP, and second
Current source IB2 provides operating current for the first operational amplifier OP, and the reverse input end of the first operational amplifier OP accesses third
The voltage of the second end output of switch 1037, to form voltage follow so that the voltage of the second end of third switch 1037 and
The voltage swing of first operational amplifier OP output is consistent, and thereby may be ensured that pwm signal adjusts the electricity of LED light group 102
The accuracy of pressure.In addition, the first operational amplifier OP, LED light group 102, third switch 1037 and ground resistance R1 constitute perseverance
Loop is flowed, at this point, the presence of the pull-up current due to the offer of the first current source 1034, to greatly improve constant current loop
(phase margin (outer literary fame phase margin, PM), also known as phase ampleness, are extremely important in circuit design to phase margin
An index, be mainly used to measure the stability of degeneration factor, and can be for predicting the mistake of closed-loop system step response
Punching) so that the performance of LED dimming device is more stable.
Optionally, as shown in figure 5, control circuit 1033 includes Schmitt trigger X1, the first phase inverter N1, the second reverse phase
Device N2, third phase inverter N3, the 4th phase inverter N4, the 5th phase inverter N5, hex inverter N6, third current source IB3, first
Metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, third metal-oxide-semiconductor Q3, the 4th metal-oxide-semiconductor Q4, first capacitor C1 and NAND gate NOR, Schmitt triggering
The input terminal of device X1 is the control signal input of control circuit 1033, the output end and the first phase inverter of Schmitt trigger X1
The input terminal of N1 connects；The output end of first phase inverter N1 is connect with the input terminal of the second phase inverter N2, the second phase inverter N2's
Output end is connect with the input terminal of third phase inverter N3；The output end of third phase inverter N3, hex inverter N6 input terminal, with
The gate interconnection of the first input end of NOT gate NOR, the grid of the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2；The source of first metal-oxide-semiconductor Q1
The extremely power input of control circuit 1033, the drain electrode of the first metal-oxide-semiconductor Q1, the drain electrode of the second metal-oxide-semiconductor Q2, first capacitor C1
The interconnection of the input terminal of first end and the 4th phase inverter N4；The source electrode of second metal-oxide-semiconductor Q2 is connect with the drain electrode of third metal-oxide-semiconductor Q3, the
The source electrode of three metal-oxide-semiconductor Q3, the substrate of the second metal-oxide-semiconductor Q2, the source electrode of the 4th metal-oxide-semiconductor Q4 and the second end of first capacitor C1 connect
Ground, grid, the drain electrode of the grid, the 4th metal-oxide-semiconductor Q4 of the 4th metal-oxide-semiconductor Q4 and the output of third current source IB3 of third metal-oxide-semiconductor Q3
End connection；The input terminal of third current source IB3 is connect with the output end of pressure drop circuit 1031；The output end of hex inverter N6 is
First output end of control circuit 1033；The output end of 4th reverser is connect with the input terminal of the 5th reverser, and the 5th is reversed
The output end of device is connect with the second input terminal of NAND gate NOR, and the output end of NAND gate NOR is the second defeated of control circuit 1033
Outlet.
Wherein, pwm signal carries out waveform by Schmitt trigger X1 and arranges anti-interference process, third current source IB3, the
One metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, third metal-oxide-semiconductor Q3, the 4th metal-oxide-semiconductor Q4 and first capacitor C1 generate a time delay electricity jointly
Road, wherein the signal B of signal A and the 5th phase inverter the N5 output of third phase inverter N3 output is generated by a NAND gate NOR
Second logical signal DIMP.Second logical signal DIMP can pull up electricity when the first logical signal DIMN signal is in failing edge
Stream.So that output electric current is drawn high rapidly again, it is notable that the pulsewidth of the second logical signal DIMP cannot be made too greatly also not
It can be made too small, will lead to very much electric current greatly has very big overshoot, the too small depth that can reduce light modulation.So herein can be according to need
Want flexible setting.
Optionally, first switch 1036 and third switch 1037 are N-MOS pipe, and second switch 1035 is P-MOS pipe.
Wherein, due to the presence of 1037 input capacitance of third switch, delay so the grid voltage of third switch 1037 rises
Slowly, the second logical signal DIMP is 1035 pipe driving signal of second switch, and the pipe of second switch 1035 is mainly believed in the first logic
Number DIMN signal failing edge draws high 1037 grid voltage of third switch after arriving as early as possible.So that output electric current as far as possible with PWM
The conversion speed of signal is consistent.Second current source IB2 provides bias current, the first current source 1034 for the first operational amplifier OP
Reference current is pulled up for the grid voltage of third switch 1037, while improving the phase margin of loop, and then make system loop more
Add stabilization.It is worth noting that, first switch 1036 and third switch 1037 can also manage for P-MOS, corresponding second switch
1035 manage for N-MOS.Or first switch 1036, third switch 1037 and second switch 1035 can also be triode.Specifically
Principle is not repeating herein referring to above-described embodiment.
It is illustrated below in conjunction with pair the principle of the present invention of Fig. 1,2,3,4:
Voltage is reduced by the pinch-off voltage of field-effect tube J1.Voltage after reduction passes through internal electric source generator
10311 generate voltage VDD, this VDD is other module for power supply.Band-gap reference device 10321 generates not with the changed ginseng of temperature
Voltage is examined, when external control devices output pwm signal, the pwm signals such as bluetooth, WIFI or other intelligent mould groups are admitted to logic
Controller 10331, logic controller 10331 generates the second logical signal DIMP and the first logical signal DIMN, since third is opened
The presence of 1037 input capacitances is closed, so the grid voltage of third switch 1037 rises slowly, the second logical signal DIMP is the
Two switches, 1035 pipe driving signal, the pipe of second switch 1035 are mainly most after the arrival of the first logical signal DIMN signal failing edge
1037 grid voltage of third switch is drawn high fastly.So that output electric current is consistent with the conversion speed of pwm signal as far as possible.Second electricity
Stream source IB2 provides bias current for the first operational amplifier OP, and the first current source 1034 is the grid voltage of third switch 1037
Reference current is pulled up, as shown in figure 4, the current waveform for flowing through third switch 1037 is divided into the a-signal for not adding the second current source IB2
With the B signal for having added the second current source IB2, adds the B signal of the second current source IB2 to be promoted and contracted to the time of same electric current from t2
It is as short as t1, the voltage increase speed that can be apparent from third switch 1037 is accelerated, to improve corresponding third switch
The duty ratio of the current value of 1037 outputs, greatly improves the phase margin of constant current loop, improves light modulation depth.
To achieve the above object, the present invention also provides a kind of light adjusting systems, more including multiple LED dimming devices as above
A LED dimming device is arranged in parallel.
It is understood that due to having used above-mentioned LED dimming device in light adjusting system of the present invention, the present invention
The embodiment of light adjusting system includes whole technical solutions of above-mentioned LED dimming device whole embodiments, technical effect achieved
Also identical, details are not described herein.Meanwhile multiple LED dimming devices are arranged in parallel the output that relatively high power may be implemented.
Optionally, the input terminal of the control circuit 1033 of multiple LED dimming devices and one/multiple external control devices connect
It connects, the control circuit 1033 of multiple LED dimming devices receives multiple identical/different pwm signals.
In the first embodiment, the input terminal of the control circuit 1033 of multiple LED dimming devices is set with an external control
Standby connection, the control circuit 1033 of multiple LED dimming devices receive identical pwm signal.It is possible thereby to realize toning and light modulation
Two kinds of functions, it can also be glory LED that LED light group 102 herein, which can be white light LEDs,.At this point, LED light group 102 is all bright
Degree variation is consistent, and synchronous toning and light modulation may be implemented.
In a second embodiment, the input terminal of the control circuit 1033 of multiple LED dimming devices is set with an external control
Standby connection, the control circuit 1033 of multiple LED dimming devices receive multiple and different pwm signals.At this point, same external control is set
Standby output multiple control signal controls the variation of the LED light group 102 of multiple LED dimming devices, at this point it is possible to realize different LED
The independent control of lamp group 102, when LED light group 102 is white light LEDs, the variation with more brightness, when LED light group 102 is glory
LED, the variation with more colors.
In the third embodiment, the input terminal of the control circuit 1033 of multiple LED dimming devices is set with multiple external controls
Standby connection, the control circuit 1033 of multiple LED dimming devices receive multiple and different pwm signals.Specific principle is referring to second
Embodiment is not repeating herein.
In the fourth embodiment, the input terminal of the control circuit 1033 of multiple LED dimming devices is set with multiple external controls
Standby connection, the control circuit 1033 of multiple LED dimming devices receive multiple identical pwm signals.Specific principle is referring to first
Embodiment is not repeating herein.
Optionally, power circuit 101 includes voltage source, first diode, the second diode, third diode and the four or two
Pole pipe.
Wherein, first diode, the second diode, third diode and the 4th diode collectively constitute rectifier bridge, friendship
Galvanic electricity pressure is converted into DC voltage, flows through LED light string, is the work electricity consumption of entire circuit with stable.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all in the present invention
Inventive concept under, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/be used in it indirectly
He is included in scope of patent protection of the invention relevant technical field.
Claims (10)
1. a kind of LED dimming device, including power circuit, LED light group and driving circuit, which is characterized in that the driving circuit
Including pressure drop circuit, reference voltage circuit, control circuit, first switch, second switch, third switch and the first current source；
The power circuit, for providing working power for the LED light group；
The pressure drop circuit, for providing work for the control circuit, the reference voltage circuit and first current source
Voltage；
The reference voltage circuit, for exporting preset reference voltage；
The control circuit, for receiving pwm signal, and based on the received, pwm signal is exported described in the control of the first logical signal
First switch is switched on or off, while exporting disconnection or conducting that the second logical signal controls the second switch, institute
It states first switch and the second switch is positive Reverse Turning Control；
The third switch, conducting when for receiving the preset reference voltage value, and in first switch conducting,
Change the current value of output according to first logical signal；
First current source, in second switch conducting, output to draw high voltage to the third and switch, quickening the
The rate of voltage rise of the controlled end of three switches.
2. LED dimming device as described in claim 1, which is characterized in that the control circuit includes power input, control
Signal input part, the first output end and second output terminal processed, the input terminal of the output end of the power circuit and the LED light group
Connection, the first end interconnection of the output end of the LED light group, the input terminal of the pressure drop circuit and third switch are described
Pressure drop circuit and the third switch connecting node be the driving circuit input terminal, the output end of the pressure drop circuit,
The input terminal of the input terminal of the reference voltage circuit, the power input of the control circuit and first current source is mutual
Even；The control signal input of the control circuit is connect with external control devices, the first output end of the control circuit with
The controlled end of the first switch connects, and the second output terminal of the control circuit is connect with the controlled end of the second switch；
The output end of the reference voltage circuit, the first end of the first switch, the first end of the second switch and the third
The controlled end of switch interconnects, and the second end of the first switch is the ground terminal of the driving circuit；The of the second switch
Two ends are connect with the output end of first current source；The second end of the third switch is the output end of the driving circuit.
3. LED dimming device as described in claim 2, which is characterized in that the driving circuit is integrated on driving chip.
4. LED dimming device as described in claim 2, which is characterized in that the LED dimming device further includes ground connection electricity
Resistance, the output end of the driving circuit connect with the first end of the ground resistance, the ground terminal of the driving circuit and described
The second end of ground resistance is grounded.
5. LED dimming device as described in claim 2, which is characterized in that the pressure drop circuit includes field-effect tube and interior
Portion's power source generator, the grounded-grid of the field-effect tube, the drain electrode of the field-effect tube are the input terminal of the pressure drop circuit,
The source electrode of the field-effect tube is connect with the input terminal of the internal electric source generator, the output end of the internal electric source generator
For the output end of the pressure drop circuit.
6. LED dimming device as described in claim 2, which is characterized in that the reference voltage circuit includes band-gap reference
Device, the first operational amplifier and the second current source, the input terminal of the input terminal of the band-gap reference device and second current source
The connecting node of connection, the band-gap reference device and second current source is the input terminal of the reference voltage circuit, described
The output end of band-gap reference device is connect with the positive input of first operational amplifier；The output end of second current source
It is connect with the power end of first operational amplifier, the reverse input end of first operational amplifier and the third switch
Second end connection, the output end of first operational amplifier is the output end of the reference voltage circuit.
7. LED dimming device as described in claim 1, which is characterized in that the control circuit include Schmitt trigger,
First phase inverter, the second phase inverter, third phase inverter, the 4th phase inverter, the 5th phase inverter, hex inverter, third current source,
First metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, first capacitor and NAND gate, the Schmitt trigger it is defeated
Enter the control signal input that end is the control circuit, the output end of the Schmitt trigger and first phase inverter
Input terminal connection；The output end of first phase inverter is connect with the input terminal of second phase inverter, second phase inverter
Output end connect with the input terminal of the third phase inverter；The output end of the third phase inverter, the hex inverter
The gate interconnection of input terminal, the first input end of the NAND gate, the grid of first metal-oxide-semiconductor and second metal-oxide-semiconductor；Institute
The source electrode for stating the first metal-oxide-semiconductor is the power input of the control circuit, the drain electrode of first metal-oxide-semiconductor, second metal-oxide-semiconductor
Drain electrode, the first capacitor first end and the 4th phase inverter input terminal interconnection；The source electrode of second metal-oxide-semiconductor with
The drain electrode of the third metal-oxide-semiconductor connects, the source of the source electrode of the third metal-oxide-semiconductor, the substrate of the second metal-oxide-semiconductor, the 4th metal-oxide-semiconductor
The second end of pole and the first capacitor is grounded, the grid of the third metal-oxide-semiconductor, the grid of the 4th metal-oxide-semiconductor, described
The connection of the output end of the drain electrode of four metal-oxide-semiconductors and the third current source；The input terminal of the third current source and pressure drop electricity
The output end on road connects；The output end of the hex inverter is the first output end of the control circuit；Described 4th is reversed
The output end of device is connect with the input terminal of the 5th reverser, and the of the output end of the 5th reverser and the NAND gate
The connection of two input terminals, the output end of the NAND gate are the second output terminal of the control circuit.
8. such as the described in any item LED dimming devices of claim 1-7, which is characterized in that the first switch and third switch
For N-MOS pipe, the second switch is P-MOS pipe.
9. a kind of light adjusting system, including it is multiple such as the described in any item LED dimming devices of claim 1-8, which is characterized in that it is more
A LED dimming device is arranged in parallel.
10. light adjusting system as described in claim 9, which is characterized in that the control circuit of multiple LED dimming devices
Input terminal is connect with one/multiple external control devices, the control circuit of multiple LED dimming devices receive it is identical/
Different pwm signals.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811490642.9A CN109302777B (en) | 2018-12-06 | 2018-12-06 | LED dimming device and dimming system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811490642.9A CN109302777B (en) | 2018-12-06 | 2018-12-06 | LED dimming device and dimming system |
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| CN109302777A true CN109302777A (en) | 2019-02-01 |
| CN109302777B CN109302777B (en) | 2024-03-15 |
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| CN111083826A (en) * | 2019-12-25 | 2020-04-28 | 深圳市芯飞凌半导体有限公司 | LED drive circuit capable of adjusting brightness and color |
| CN115460734A (en) * | 2022-05-17 | 2022-12-09 | 深圳锐盟半导体有限公司 | LED control circuit, electronic equipment and electronic device |
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| Publication number | Publication date |
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| CN109302777B (en) | 2024-03-15 |
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