CN205812463U - Light emitting diode DC control circuit - Google Patents
Light emitting diode DC control circuit Download PDFInfo
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- CN205812463U CN205812463U CN201620766034.6U CN201620766034U CN205812463U CN 205812463 U CN205812463 U CN 205812463U CN 201620766034 U CN201620766034 U CN 201620766034U CN 205812463 U CN205812463 U CN 205812463U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
This utility model provides a kind of light emitting diode DC control circuit.Light emitting diode DC control circuit includes AC to DC converter circuit, bleeder circuit, controller and mixed logic circuit.AC to DC converter circuit receives exchange reference voltage and produces sine wave reference voltage and DC reference voltage.Controller receives door reference voltage and DC reference voltage and is compared to produce internal reference voltage, and its middle controller receives the first PWM voltage signal to sample internal reference voltage to export the second PWM voltage signal.In each cycle corresponding to sine wave reference voltage, it is relative maximum that load current has at least one driving signal in multiple driving signal, and multiple driving signal.
Description
Technical field
This utility model is about a kind of light emitting diode (Light-Emitting Diode, LED) DC control circuit,
Especially with regard to a kind of light emitting diode DC control circuit based on direct current and low frequency samples.
Background technology
Recently, being used in illuminator along with light emitting diode (LED) is substantial amounts of, increasing light emitting diode shines
Bright system uses alternating current power supply as the power supply of LED illumination system.Traditionally, use alternating current power supply as multiple
The power supply of the illuminator of optical diode, can make all wave rectification via bridge rectifier by alternating current by the alternating current of input, then
Export and use to light emitting diode.
Light emitting diode (LED) is a kind of light source based on quasiconductor, is frequently applied in low power consumption instrument and household electrical appliances
Indicator, application light emitting diode is more and more universal at various illuminators.Such as, the light emitting diode of high brightness is
It is widely used in traffic light, automobiles indicator lamp, and car light.In recent years, high-tension light emitting diode string is used
Luminaire, also has been developed to replace traditional white heat bulb and fluorescent lamp bulb.The current vs voltage (IV) of light emitting diode is special
Linearity curve is similar to general general-purpose diode, when the voltage being added on light emitting diode is less than the forward voltage of diode, only
The least electric current is had to pass through light emitting diode.When voltage exceedes forward voltage, by the electric current of light emitting diode the most significantly
Increase.In general, in most of opereating specifications, the luminous intensity of illuminator based on light emitting diode is and the electricity passed through
Stream is directly proportional, but operation is the most such when high electric current.It is typically based on the driving dress of the illuminator design of light emitting diode
Put, be all that to provide a constant electric current be main, in order to stable light can be sent and extend the life-span of light emitting diode.
Compared to the most traditional electric filament lamp, fluorescent lamp or other lighting sources, light emitting diode (Light Emitting
Diode, LED) owing to having that chemiluminescence efficiency is good, pollution-free and the advantage such as life-span length, therefore it is increasingly becoming various at present
The first-selection that luminaire lamp source selects.Also because popularizing in light emitting diode use, have been developed that in the prior art perhaps
The adjustment control mode of many brightness for light emitting diode.In the prior art, it is common that utilize phase truncation light-adjusting module
The control circuit that collocation is complicated, utilizes the mode of LED flash of allowing, and allows use by the phenomenon of user's persistence of vision
Person feels the brightness deterioration of light emitting diode, adjusts the brightness of light emitting diode whereby.But this kind of dimming mode may still can
Part user is allowed to see that light emitting diode constantly flashes and feels uncomfortable.And control circuit in prior art is the most multiple
Miscellaneous, the cost on manufacturing can be increased.
Summary of the invention
This practicality new purpose be flexibly and be effectively improved the utilization rate of light emitting diode to reduce power consumption
Damage, and stability and high brightness are provided.
The purpose of this utility model and solve it and technical problem is that and use following technical scheme to realize.According to this reality
By a kind of light emitting diode DC control circuit of novel proposition, it is used for driving at least one light emitting diode string.Light-emitting diodes
Pipe DC control circuit includes AC to DC converter circuit, bleeder circuit, controller and mixed logic circuit.AC to DC converter circuit
Receive exchange reference voltage and produce sine wave reference voltage and DC reference voltage.Bleeder circuit is electrically connected with DC reference electricity
Press and produce door reference voltage.Controller is electrically connected with AC to DC converter circuit and bleeder circuit, and controller receives door ginseng
Examining voltage and DC reference voltage and compared to produce internal reference voltage, its middle controller receives the first PWM electricity
Pressure signal samples internal reference voltage to export the second PWM voltage signal.Mixed logic circuit is electrically connected with controller
To receive the second PWM voltage signal to produce driving voltage and load current and to drive power switch transistor accordingly.?
Corresponding to each cycle of sine wave reference voltage, load current has in multiple driving signal, and multiple driving signal extremely
A few driving signal is relative maximum.
The purpose of this utility model and solve its technical problem and also can be further achieved by the following technical measures
Aforesaid light emitting diode DC control circuit, wherein this AC to DC converter circuit includes:
Rectification circuit, its input is in order to receive this exchange reference voltage and to give all wave rectification to produce at its outfan
This sine wave reference voltage；And
Generating circuit from reference voltage, by processing this sine wave reference voltage to produce this DC reference voltage.
Aforesaid light emitting diode DC control circuit, wherein this generating circuit from reference voltage includes:
First resistance, its one end is connected to the outfan of this rectification circuit and receives this sine wave reference voltage；
Second resistance, its one end is connected to the other end of this first resistance；
The first transistor, its grid is connected to one end of this second resistance, and its source electrode is connected to another of this second resistance
End；
3rd resistance, its one end is connected to one end of this first resistance；
Transistor seconds, its grid is connected to the other end of the 3rd resistance, and its drain electrode is connected to the one of the 3rd resistance
End；
Third transistor, its collector is connected to the other end of the 3rd resistance, and its base stage is connected to this transistor seconds
Source electrode；
4th resistance, its one end is connected to the emitter-base bandgap grading of this third transistor, and its other end is connected to the another of this first resistance
One end；And
5th resistance, its one end is connected to the base stage of this third transistor, and its other end is connected to the another of the 4th resistance
One end,
Wherein when this first transistor turns on, then this transistor seconds cut-off, and when this first transistor ends,
Then this transistor seconds conducting, whereby to produce charging current.
Aforesaid light emitting diode DC control circuit, wherein by the resistance value ratio of this first resistance and this second resistance
Set during determining this first transistor on or off, and then determine the current value of this charging current.
Aforesaid light emitting diode DC control circuit, wherein this generating circuit from reference voltage also includes:
First electric capacity, its one end is connected to the other end of the 5th resistance to receive this charging current and to produce this direct current ginseng
Examine voltage；And
Zener diode, its anode is connected to the other end and an earth terminal of this first electric capacity, and its negative electrode is connected to this
One end of first electric capacity.
Aforesaid light emitting diode DC control circuit, wherein this power switch circuit is a power switch transistor, and
And this mixed logic circuit includes:
6th resistance, its one end connects this controller, and its other end connects an earth terminal；
4th transistor, its grid connects one end of the 6th resistance and receives this second PWM voltage signal, its
Source electrode connects this earth terminal；
7th resistance, one end receives this DC reference voltage, and its other end connects the drain electrode of the 4th transistor；
8th resistance, its one end connects the other end of the 7th resistance；
5th transistor, its grid connects one end of the 8th resistance, and its source electrode connects this earth terminal, and its drain electrode connects should
The other end of the 8th resistance and the grid of this power switch transistor, wherein the source electrode of this power switch transistor is connected to this and connects
Ground end；And
9th resistance, its one end connects this DC reference voltage, and its other end connects the drain electrode of the 5th transistor,
Wherein when four transistor turns, then the 5th transistor cutoff, and when five transistor turns,
Then the 4th transistor cutoff, whereby persistently to drive this power switch transistor.
In one of them embodiment of this utility model, its middle controller has acquiescence and determines frequency, the second PWM electricity
The frequency of pressure signal is determined frequency and is determined by giving tacit consent to.
In one of them embodiment of this utility model, wherein the dutycycle of the second PWM voltage signal is by the first arteries and veins
The dutycycle of width modulation voltage signal determines.
In one of them embodiment of this utility model, wherein the magnitude of voltage of internal reference voltage is more than this door reference electricity
The magnitude of voltage of pressure.
In sum, advantage of the present utility model and effect thereof are the light emitting diode DC control electricity that embodiment is proposed
Road, has low-loss high-performance structure of voltage regulation to provide DC source, to drop the confession rate consume of low voltage transition.
Furthermore, the light emitting diode DC control circuit that this utility model embodiment is proposed, corresponding to sine wave ginseng
Examining each cycle of voltage, the second PWM voltage signal has multiple pulse width modulation signal, and multiple PWM news
In number, at least one pulse width modulation signal is relative maximum, whereby to reduce the phenomenon of LED light-emitting flash.
This utility model has low-loss high-performance structure of voltage regulation to provide DC source, to drop the confession rate of low voltage transition
The advantage of consume.
For making any relevant art of being familiar with understand technology contents of the present utility model and implement according to this, and according to this explanation
Content disclosed by book, claim and graphic, any relevant art of being familiar with can be readily understood upon this utility model phase
The purpose closed and advantage, therefore will describe detailed features of the present utility model and advantage in embodiments in detail.
Accompanying drawing explanation
Fig. 1 is the circuit region according to the light emitting diode DC control circuit depicted in this utility model exemplary embodiments
Block figure.
Fig. 2 is thin according to the light emitting diode DC control circuit depicted in this utility model another embodiment exemplary
Portion's circuit diagram.
Fig. 3 is the phase according to the light emitting diode DC control circuit depicted in this utility model another embodiment exemplary
Close oscillogram.
Fig. 4 is the phase according to the light emitting diode DC control circuit depicted in this utility model another embodiment exemplary
Close oscillogram.
Fig. 5 is bearing according to the light emitting diode DC control circuit depicted in this utility model another embodiment exemplary
Carry current waveform figure.
[symbol description]
100,200: light emitting diode DC control circuit
110: AC to DC converter circuit
120: bleeder circuit
130: controller
140: mixed logic circuit
150: power switch circuit
C1: electric capacity
D1, D2, D3, D4, D5: diode
DL: light emitting diode
GND: earth terminal
ICH: charging current
IL: load current
M1, M2, M3, M4, M5: transistor
R1, R2, R3, R4, R5, R6, R7, R8, R9, R11: resistance
RS1, RS2: divider resistance
T1: input
T2: outfan
PWIN: the first PWM voltage signal
PWOUT: the second PWM voltage signal
VCC: DC reference voltage
VRC: exchange reference voltage
VP: sine wave reference voltage
VN: output voltage
VTC: door reference voltage
ZD1: Zener diode
Detailed description of the invention
Various exemplary embodiments will be more fully described with reference to alterations below, show in alterations
Exemplary embodiments.But, this utility model concept may embody in many different forms, and should not be construed as limited by herein
Middle illustrated exemplary embodiments.Specifically, it is provided that these exemplary embodiments make this utility model will for detailed and
Completely, and will fully pass on the category of this utility model concept to those who familiarize themselves with the technology.All graphic in, can be in order to clear
Lavish praise on oneself size and the relative size in Ceng Ji district.Similar numeral indicates similar assembly all the time.
Should be understood that although possible use term first, second, third, etc. are to describe various assembly herein, but these groups
Part should not limited by these terms.These terms are to distinguish an assembly and another assembly.Therefore, first group be discussed herein below
Part can be described as second assembly teaching without departing from this utility model concept.As used herein, term (and/or) include phase
Any one and all combinations of one or many person listed in project of association.
Hereinafter will coordinate with various embodiments and graphic illustrate that described light emitting diode DC control circuit can reduce electricity
The confession rate consume of pressure conversion and the phenomenon of reduction LED light-emitting flash.Furthermore, this disclosure can flexibly and be effectively improved send out
The utilization rate of optical diode, reduces power dissipation, and provides stability and high brightness.But, following embodiment is also not used to limit
This utility model processed.
(embodiment of light emitting diode DC control circuit)
Refer to Fig. 1, Fig. 1 is according to the light emitting diode DC control electricity depicted in this utility model exemplary embodiments
The circuit blocks figure on road.As it is shown in figure 1, for the light emitting diode DC control electricity driving at least one light emitting diode string DL
Road 100 includes AC to DC converter circuit 110, bleeder circuit 120, controller 130 and mixed logic circuit 140.Bleeder circuit 120
It is electrically connected with AC to DC converter circuit 110.Controller 130 is electrically connected with AC to DC converter circuit 110 and bleeder circuit 120.Just
Negative logic circuit 140 is electrically connected with controller 130 and power switch circuit 150.
About AC to DC converter circuit 110, AC to DC converter circuit 110 is in order to the exchange reference voltage VRC of receiving chamber electricity
And changed and corresponding produce sine wave reference voltage VP and stable DC reference voltage VCC, wherein DC reference voltage
VCC is in order to provide to each circuit blocks.
About bleeder circuit 120, bleeder circuit 120 can be resistor-type bleeder circuit, and bleeder circuit 120 receives directly
Stream reference voltage VCC also produces door reference voltage VTC by internal electric resistance partial pressure.
About controller 130, controller 130 is in order to receive door reference voltage VTC and DC reference voltage VCC and to give
Relatively to produce internal reference voltage (Fig. 1 mark), wherein the magnitude of voltage of internal reference voltage is more than door reference voltage VTC's
Magnitude of voltage.
About mixed logic circuit 140, mixed logic circuit 140 is in order to receive the second PWM voltage signal PWOUT
To produce driving voltage VDC and load current IL and to drive power switch circuit 150 accordingly.
In most application, it is required for certain type of supply voltage conversion equipment, by the most universal height
Voltage source, is converted into relatively low voltage, to be supplied to one or more illumination units based on light emitting diode.Because needing
Want such a voltage conversion device, cause luminaire decreasing efficiency based on light emitting diode, cost up, it is also difficult to
Reduce its volume.Therefore, this disclosure is to improve efficiency based on the illuminator using light emitting diode.
To be taught, it is the operating mechanism further illustrating light emitting diode DC control circuit 100.
In the present embodiment, exchange is joined by light emitting diode DC control circuit 100 by AC to DC converter circuit 110
Examine voltage VRC and be converted to sine wave reference voltage VP, and further sine wave reference voltage VP is converted to DC reference electricity
Pressure VCC.Light emitting diode DC control circuit 100 has low-loss high-performance structure of voltage regulation to provide DC source, to reduce
The confession rate consume of voltage conversion.It follows that sine wave reference voltage VP by resistance R11 the range of decrease and be sent to controller
130.Afterwards, controller 130 receives the first PWM voltage signal PWIN and carrys out low frequency samples internal reference voltage to export
Two PWM voltage signal PWOUT, sampling frequency therein is between 45Hz to 1kHz.
Should be noted that, controller 130 has an acquiescence and determines frequency (such as 360MHz), and the second PWM electricity
The frequency of pressure signal PWOUT is determined frequency and is determined by giving tacit consent to.Dutycycle (the duty of the second PWM voltage signal PWOUT
Ratio) determined by the dutycycle of the first PWM voltage signal PWIN.In the present embodiment, corresponding to sine wave ginseng
Examining each cycle of voltage VP, load current IL has multiple driving signal (such as 3,5 or 7), and multiple driving
In signal, at least one driving signal is relative maximum, whereby to reduce the phenomenon of light emitting diode DL light-emitting flash.Such as, exist
Under each cycle of sine wave reference voltage VP, load current IL drives the driving news in signal with a relative maximum
Number, its amplitude drives signal more than other.
In ensuing multiple embodiments, description is different from the part of above-mentioned Fig. 1 embodiment, and remaining clipped
Identical with the part of above-mentioned Fig. 1 embodiment.Additionally, for explanation conventionally, similar reference number or label instruction are similar
Assembly.
(another embodiment of light emitting diode DC control circuit)
Refer to Fig. 2, Fig. 2 is according to the light emitting diode direct current control depicted in this utility model another embodiment exemplary
The thin portion circuit diagram of circuit processed.As in figure 2 it is shown, AC to DC converter circuit 110 includes that rectification circuit 112 produces electricity with reference voltage
Road 114.Generating circuit from reference voltage 114 include the first resistance R1, the second resistance R2, the first transistor M1, the 3rd resistance R3,
Two-transistor M2, third transistor M3, the 4th resistance R4, the 5th resistance R5, the first electric capacity C1 and Zener diode ZD1.Positive and negative
Logic circuit 140 includes the 6th resistance R6, the 4th transistor M4, the 7th resistance R7, the 8th resistance R8, the 5th transistor M5 and
Nine resistance R9.Bleeder circuit 120 includes divider resistance RS1 and RS2.
Generating circuit from reference voltage 114 is connected to rectification circuit 112.One end of first resistance R1 is connected to rectification circuit
The outfan T2 of 112.One end of second resistance R2 is connected to the other end of the first resistance R1.The grid of the first transistor M1 connects
To one end of the second resistance R2, the source electrode of the first transistor M1 is connected to the other end of the second resistance R2.The one of 3rd resistance R3
End is connected to one end of the first resistance R1.The grid of transistor seconds M2 is connected to the other end of the 3rd resistance R3, and second
The drain electrode of transistor M2 is connected to one end of the 3rd resistance R3.The collector of third transistor M3 is connected to another of the 3rd resistance R3
End, the base stage of third transistor M3 is connected to the source electrode of transistor seconds M2.
One end of 4th resistance R4 is connected to the emitter-base bandgap grading of third transistor M3, and the other end of the 4th resistance R4 is connected to first
The other end of resistance R1.One end of 5th resistance R5 is connected to the base stage of third transistor M3, and the other end of the 5th resistance R5 is even
It is connected to the other end of the 4th resistance R4.One end of first electric capacity C1 is connected to the other end of the 5th resistance R5.Zener diode ZD1
Anode be connected to the other end of the first electric capacity C1 and earth terminal GND, and the negative electrode of Zener diode ZD1 is connected to the first electricity
Hold one end of C1.One end of 6th resistance R6 is connected to controller 130, and the other end of the 6th resistance R6 is connected to earth terminal GND.
The grid of the 4th transistor M4 connects one end of the 6th resistance R6, and the source electrode of the 4th transistor M4 connects earth terminal GND.The
The other end of seven resistance R7 is connected to the drain electrode of the 4th transistor M4.One end of 8th resistance R8 is connected to the another of the 7th resistance R7
One end.The grid of the 5th transistor M5 connects one end of the 8th resistance R8, and the source electrode of the 5th transistor M5 is connected to ground connection
End GND, the drain electrode of the 5th transistor M5 is connected to the other end of the 8th resistance R8 and the grid of power switch transistor MP, wherein
The source electrode of power switch transistor MP is connected to earth terminal GND.The other end of the 9th resistance R9 connects the leakage of the 5th transistor M5
Pole.
To be taught, it is the operating mechanism further illustrating light emitting diode DC control circuit 200.
It is according to the luminescence two depicted in this utility model another embodiment exemplary referring to Fig. 2 and Fig. 3, Fig. 3
The waveform correlation figure of pole pipe DC control circuit.In the present embodiment, rectification circuit 112 is a full-wave rectifying circuit, and it has
Diode D1, D2, D3 and D4, it is electrically connected with mode as shown in Figure 2.The input T1 of rectification circuit 112 is in order to receive exchange
Reference voltage VRC and give all wave rectification with its outfan T2 produce sine wave reference voltage VP.It follows that light-emitting diodes
It is stable straight to produce that pipe DC control circuit 200 processes sine wave reference voltage VP by generating circuit from reference voltage 114
Stream reference voltage VCC.Specifically, the amplitude of sine wave reference voltage VP is along with the first resistance R1 and the resistance of the second resistance R2
The setting of ratio and have difference, therefore, it is possible to determine that first is brilliant by the setting of the first resistance R1 and the resistance value ratio of the second resistance R2
During the on or off of body pipe M1, and then determine the current value of charging current ICH.
Specifically, when the magnitude of voltage of sine wave reference voltage VP rises to be enough to make the first transistor M1 turn on, then
The grid of transistor seconds M2 can be short-circuit so that transistor seconds M2 ends with source electrode, and then makes the current value of charging current ICH
It is zero.On the other hand, when the magnitude of voltage of sine wave reference voltage VP makes the first transistor M1 be in cut-off state, then second
Transistor M2 meeting normally, and then the oscillogram of charging current ICH that generation is as shown in Figure 3.Furthermore, the first electric capacity C1 passes through
Receive charging current ICH charge and produce DC reference voltage VCC whereby.In the present embodiment, DC reference voltage VCC
Magnitude of voltage is 5 volts.Therefore, light emitting diode DC control circuit 200 has low-loss high-performance structure of voltage regulation to provide straight
Stream power supply, to drop the confession rate consume of low voltage transition.
It follows that referring to Fig. 2, Fig. 4 and Fig. 5, Fig. 4 is to be painted according to this utility model another embodiment exemplary
The waveform correlation figure of the light emitting diode DC control circuit shown.Fig. 5 is according to this utility model another embodiment institute exemplary
The load current waveform figure of the light emitting diode DC control circuit illustrated.Controller 130 via the resistance R11 range of decrease just receives
String ripple reference voltage VP, and receive door reference voltage VTC, and give producing internal reference voltage ITV more whereby, its
The magnitude of voltage of the middle internal reference voltage ITV magnitude of voltage more than door reference voltage VTC.In one embodiment, door is with reference to electricity
The magnitude of voltage of pressure VTC is 1 volt, but is not limited thereto.On the other hand, controller 130 can utilize the first PWM voltage
Signal PWIN samples internal reference voltage ITV to export the second PWM voltage signal PWOUT.In one embodiment, tool
The amplitude driving signal having relative maximum is that other drives more than the amplitude twice of signal.
In this utility model embodiment, designer can design an acquiescence at controller 130 and determine frequency (preset
Frequency), and by this acquiescence determine frequency determine the second PWM voltage signal PWOUT frequency (about between
45Hz～1kHz).Therefore, light emitting diode DC control circuit 200 is the circuit framework of low frequency samples, not in known techniques
Use the circuit framework of high frequency sampling.Additionally, designer can be by designing the duty of the first PWM voltage signal PWIN
The dutycycle (X%:Y%) of the second PWM voltage signal PWOUT is determined than (X%:Y%).For example, the first pulsewidth
The dutycycle of demodulating voltage signal PWIN is 40%:60%, then the dutycycle of the second PWM voltage signal PWOUT is then
40%:60%.In one embodiment, the first PWM voltage signal PWIN first passes through optical coupler (Fig. 2 does not illustrates) and enters back into
Controller 130.Should be noted that, the oscillogram of the second PWM voltage signal PWOUT in the diagram is schematic diagram.
It follows that the grid of the 4th transistor M4 of mixed logic circuit 140 can receive the second PWM voltage news
Number PWOUT.When the 4th transistor M4 conducting, then the 5th transistor M5 cut-off, and when the 5th transistor M5 conducting, then the
Four transistor M4 cut-offs, produce driving voltage VDC whereby and persistently drive power switch transistor MP, and produce load current
IL and output voltage VN, wherein in multiple driving signals of load current IL, at least one drives signal to be relative maximum (pin
For each cycle), by visual persistence phenomenon whereby to reduce the situation of light emitting diode DL light-emitting flash.Additionally, two
Pole pipe D5 is used to prevent the generation of backward current.
In sum, the light emitting diode DC control circuit that this utility model embodiment is proposed, there is low-loss high
Performance structure of voltage regulation provides DC source, to drop the confession rate consume of low voltage transition.
Furthermore, the light emitting diode DC control circuit that this utility model embodiment is proposed, corresponding to sine wave ginseng
Examine each cycle of voltage, in multiple driving signals of load current IL at least one drive signal be relative maximum, whereby with
Reduce the phenomenon of LED light-emitting flash.
Simply the various embodiments described above are that feature of the present utility model is described, its purpose is make to be familiar with this operator can
Solve content of the present utility model and implement according to this, and non-limiting the scope of the claims of the present utility model, thus all other without departing from this reality
The equivalence completed by novel disclosed spirit is modified or amendment, must be included in the claim of the following stated.
Claims (9)
1. a light emitting diode DC control circuit, it is for driving at least one light emitting diode string, it is characterised in that: this
Optical diode DC control circuit includes:
AC to DC converter circuit, receives exchange reference voltage and produces sine wave reference voltage and DC reference voltage；
Bleeder circuit, is electrically connected with this DC reference voltage and produces door reference voltage；
Controller, is electrically connected with this AC to DC converter circuit and this bleeder circuit, this controller receive this door reference voltage with
This DC reference voltage also is compared to produce internal reference voltage, and wherein this controller receives the first PWM voltage news
Number sample this internal reference voltage to export the second PWM voltage signal；And
Mixed logic circuit, be electrically connected with this controller with receive this second PWM voltage signal with produce driving voltage with
Load current also drives power switch circuit accordingly,
Wherein in each cycle corresponding to this sine wave reference voltage, this load current has multiple driving signal, and should
In a little driving signals, at least one drives signal to be relative maximum.
Light emitting diode DC control circuit the most according to claim 1, it is characterised in that: wherein this controller has silent
Assert frequency, the frequency of this second PWM voltage signal is determined frequency by this acquiescence and is determined.
Light emitting diode DC control circuit the most according to claim 1, it is characterised in that: wherein this second PWM
The dutycycle of voltage signal is determined by the dutycycle of this first PWM voltage signal.
Light emitting diode DC control circuit the most according to claim 1, it is characterised in that: wherein this exchange turns unidirectional current
Road includes:
Rectification circuit, its input is in order to receive this exchange reference voltage and to give all wave rectification just to produce this at its outfan
String ripple reference voltage；And
Generating circuit from reference voltage, by processing this sine wave reference voltage to produce this DC reference voltage.
Light emitting diode DC control circuit the most according to claim 4, it is characterised in that: wherein this reference voltage produces
Circuit includes:
First resistance, its one end is connected to the outfan of this rectification circuit and receives this sine wave reference voltage；
Second resistance, its one end is connected to the other end of this first resistance；
The first transistor, its grid is connected to one end of this second resistance, and its source electrode is connected to the other end of this second resistance；
3rd resistance, its one end is connected to one end of this first resistance；
Transistor seconds, its grid is connected to the other end of the 3rd resistance, and its drain electrode is connected to one end of the 3rd resistance；
Third transistor, its collector is connected to the other end of the 3rd resistance, and its base stage is connected to the source electrode of this transistor seconds；
4th resistance, its one end is connected to the emitter-base bandgap grading of this third transistor, and its other end is connected to the other end of this first resistance；
And
5th resistance, its one end is connected to the base stage of this third transistor, and its other end is connected to the other end of the 4th resistance,
Wherein when this first transistor turns on, then this transistor seconds cut-off, and when this first transistor ends, then should
Transistor seconds turns on, whereby to produce charging current.
Light emitting diode DC control circuit the most according to claim 5, it is characterised in that: wherein by this first resistance
During setting with the resistance value ratio of this second resistance determines this first transistor on or off, and then determine this charging current
Current value.
Light emitting diode DC control circuit the most according to claim 5, it is characterised in that: wherein this reference voltage produces
Circuit also includes:
First electric capacity, its one end is connected to the other end of the 5th resistance to receive this charging current and to produce this DC reference electricity
Pressure；And
Zener diode, its anode is connected to the other end and an earth terminal of this first electric capacity, and its negative electrode is connected to this first electricity
The one end held.
Light emitting diode DC control circuit the most according to claim 1, it is characterised in that: wherein this power switch circuit
For power switch transistor, and this mixed logic circuit includes:
6th resistance, its one end connects this controller, and its other end connects earth terminal；
4th transistor, its grid connects one end of the 6th resistance and receives this second PWM voltage signal, its source electrode
Connect this earth terminal；
7th resistance, one end receives this DC reference voltage, and its other end connects the drain electrode of the 4th transistor；
8th resistance, its one end connects the other end of the 7th resistance；
5th transistor, its grid connects one end of the 8th resistance, and its source electrode connects this earth terminal, and its drain electrode connects the 8th
The other end of resistance and the grid of this power switch transistor, wherein the source electrode of this power switch transistor is connected to this ground connection
End；And
9th resistance, its one end connects this DC reference voltage, and its other end connects the drain electrode of the 5th transistor,
Wherein when four transistor turns, then the 5th transistor cutoff, and when five transistor turns, then should
4th transistor cutoff, whereby persistently to drive this power switch transistor.
Light emitting diode DC control circuit the most according to claim 1, it is characterised in that: wherein this internal reference voltage
Magnitude of voltage more than the magnitude of voltage of this door reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620766034.6U CN205812463U (en) | 2016-07-20 | 2016-07-20 | Light emitting diode DC control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620766034.6U CN205812463U (en) | 2016-07-20 | 2016-07-20 | Light emitting diode DC control circuit |
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| CN205812463U true CN205812463U (en) | 2016-12-14 |
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| CN201620766034.6U Expired - Fee Related CN205812463U (en) | 2016-07-20 | 2016-07-20 | Light emitting diode DC control circuit |
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| CN (1) | CN205812463U (en) |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161214 Termination date: 20170720 |
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| CF01 | Termination of patent right due to non-payment of annual fee |