CN207340239U - The constant-current drive circuit of LED light light modulation - Google Patents
The constant-current drive circuit of LED light light modulation Download PDFInfo
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- CN207340239U CN207340239U CN201721251032.4U CN201721251032U CN207340239U CN 207340239 U CN207340239 U CN 207340239U CN 201721251032 U CN201721251032 U CN 201721251032U CN 207340239 U CN207340239 U CN 207340239U
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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]
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Abstract
It the utility model is related to a kind of constant-current drive circuit of LED light light modulation, based on the circuit including triode transistor and LED light composition, triode transistor includes field-effect tube or triode, and LED light is electrically connected with the emitter or collector of the source electrode of field-effect tube or drain electrode or triode；Described method includes following steps：The voltage regulator module being electrically connected with the grid of field-effect tube or the base stage of triode is set, the voltage regulator module adjusts the voltage of the emitter of the source electrode of field-effect tube or triode by adjusting the grid of field-effect tube or the voltage of base stage of triode, changes so as to adjust and be output to the electric current of LED light to achieve the purpose that light modulation.The brightness of LED light can be transferred to very low by the constant-current drive circuit of the utility model LED light light modulation, and macroscopic flicker will not occur in LED light, have the advantages that circuit structure is simple, cost is low, light modulation is easy and safe and reliable.
Description
【Technical field】
The circuit device for general electric light source is the utility model is related to, power supply circuit and its control more particularly to LED
Device processed, more particularly, to the constant current driving method and circuit of LED light light modulation.The LED of the utility model is English Light
The abbreviation of Emitting Diode, Chinese are meant " light emitting diode ".
【Background technology】
In recent years, for LED as a kind of energy saving environmental protection product, application is more and more extensive, for example, for general lighting, mark and
Signal, and for backlight of display panel and video screen etc..LED drive circuit is used to provide for power supply to LED.
The characteristic of LED is requirement constant current driving.Referring to Figure 1A, which is a kind of known constant current driver circuit for LED, should
Constant current driver circuit for LED includes resistance R100, zener diode D100, field-effect tube Q100 and LED light, resistance R100 and voltage stabilizing
It is connected electrically in after diode D100 series connection between the cathode of input power and anode, the cathode of wherein zener diode D100 connects defeated
Enter the anode of power supply, resistance R100 is electrically connected with the cathode of input power, and the grid of field-effect tube Q100 is connected electrically in resistance
Between R100 and zener diode D100, the drain D of field-effect tube Q100 is electrically connected with the cathode of input power, and LED light is electrically connected
It is connected between the source S of field-effect tube Q100 and the anode of input power；When the voltage VDD fluctuations of input power, voltage stabilizing two
Pole pipe D100 stabilizes the grid voltage of N-channel type field-effect tube Q100, and the source voltage of such field-effect tube Q100 is also just steady
Fixed, the source voltage of field-effect tube Q100 is stablized, and the electric current for flowing through LED light is also just stablized；LED light in the circuit diagram can be
Single led or multiple LED series connection, or parallel connection again after multiple LED series connection.
Referring to Figure 1B, which is known another constant current driver circuit for LED, and the difference with Figure 1A is, LED light with
The drain electrode of the field-effect tube Q100 is electrically connected, and required series resistance R in the branch of the source electrode in the field-effect tube Q100.
Prior art constant current driver circuit for LED, such as the constant current driver circuit for LED of Figure 1A and Figure 1B, generally use PWM tune
Light or controllable silicon light modulation, the ON time of control field-effect tube Q100 and deadline, so as to control field-effect tube Q100's
The ratio to deadline is turned on, makes the constant current hold of LED light；And PWM light modulations or controllable silicon light modulation, it is certain low when being transferred to
It during brightness, cannot again reduce, macroscopic flicker otherwise easily occur.PWM is English Pulse Width
The abbreviation of Modulation, Chinese are pulse width modulation, abbreviation pulsewidth modulation.
【Utility model content】
The technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and provide a kind of LED
The brightness of LED light can be transferred to very low, LED light by the constant-current drive circuit of lamp light modulation, the constant-current drive circuit of LED light light modulation
Macroscopic flicker will not occur, have the advantages that circuit structure is simple, cost is low, light modulation is easy and safe and reliable.
The utility model solves the technical solution that the technical problem uses：
A kind of constant-current drive circuit of LED light light modulation, including triode transistor and LED light, the triode transistor include
Field-effect tube Q1 or triode Q1A, source electrode or drain electrode or the transmitting of triode Q1A of the LED light with the field-effect tube Q1
Pole or collector are electrically connected；The constant-current drive circuit of the LED light light modulation further includes the grid or three with the field-effect tube Q1
The voltage regulator module that the base stage of pole pipe Q1A is electrically connected, the voltage regulator module by adjusting the field-effect tube Q1 grid
Or the voltage of the base stage of triode Q1A adjusts the voltage of the emitter of the source electrode of the field-effect tube Q1 or triode Q1A, from
And the electric current that adjustment is output to LED light changes to reach light modulation.
The voltage regulator module includes the grid or triode Q1A that the field-effect tube Q1 is adjusted using adjustable resistance
Base stage voltage.
Voltage stabilizing module is set to stablize the voltage of the adjustable resistance.The Voltage stabilizing module includes zener diode or adjustable
Voltage-stabiliser tube.
Either, the voltage regulator module is included using resistance 21, resistance 22 and the switch element being cascaded, with
And the grid of field-effect tube Q1 or the base stage of triode Q1A are connected electrically between resistance 21 and resistance 22, and pass through pwm signal control
The on or off of switch element processed adjusts the voltage of the base stage of the grid of the field-effect tube Q1 or triode Q1A.
Either, the voltage regulator module includes using diode D1 and inductance L1, and is opened by pwm signal control
The on or off for closing element adjusts the voltage of the base stage of the grid of the field-effect tube Q1 or triode Q1A.
When the LED light is electrically connected with the source electrode of the field-effect tube Q1 or the emitter of triode Q1A, described
The current-limiting resistance RL for making the electric current of LED light more stable is in series with the branch of LED light；Either, when the LED light and the field
When the collector of the drain electrode of effect pipe Q1 or triode Q1A are electrically connected, in the source electrode or triode Q1A of the field-effect tube Q1
Required series limiting resistor RL in the branch of emitter.
The LED light includes the LED of the bright different colours light of two-way；In the source electrode or triode Q1A of the field-effect tube Q1
Emitter at be in series with the toggle switches of at least two gears, the LED of the different stalls control different colours light of toggle switch.
The LED light includes the LED of the bright different colours light of two-way；The voltage regulator module has two, controls two respectively
The LED of the bright different colours light in road.
Compared with the existing technology compared with the beneficial effect of the constant-current drive circuit of the utility model LED light light modulation is：
The utility model by voltage regulator module adjust field-effect tube grid or triode base stage voltage and then
To adjust the voltage of the emitter of the source electrode of field-effect tube or triode, change so as to adjust and be output to the electric current of LED light
To achieve the purpose that light modulation, during light modulation, very low-light level can be transferred to, macroscopic sudden strain of a muscle will not occur in LED light
It is bright；Have the advantages that circuit structure is simple, cost is low, light modulation is easy and safe and reliable.
【Brief description of the drawings】
Figure 1A is a kind of concise circuit diagram of constant current driver circuit for LED of the prior art；
Figure 1B is the concise circuit diagram of prior art another kind constant current driver circuit for LED；
Fig. 2A is the constant-current drive circuit of the utility model LED light light modulation concise electric principle block diagram of the first；
Fig. 2 B are the concise electric principle block diagrams of second of the constant-current drive circuit of LED light light modulation；
Fig. 2 C are the third concise electric principle block diagrams of the constant-current drive circuit of the LED light light modulation;
Fig. 2 D are the concise electric principle block diagrams of the 4th kind of the constant-current drive circuit of the LED light light modulation;
Fig. 2 E are the concise electric principle block diagrams of the 5th kind of the constant-current drive circuit of the LED light light modulation;
Fig. 2 F are the concise electric principle block diagrams of the 6th kind of the constant-current drive circuit of the LED light light modulation;
Fig. 3 A are the concise circuit diagrams of the constant-current drive circuit embodiment one of the LED light light modulation;
Fig. 3 B are the concise circuit diagrams of the constant-current drive circuit embodiment two of the LED light light modulation;
Fig. 3 C are the concise circuit diagrams of the constant-current drive circuit embodiment three of the LED light light modulation;
Fig. 3 D are the concise circuit diagrams of the constant-current drive circuit example IV of the LED light light modulation;
Fig. 3 E are the concise circuit diagrams of the constant-current drive circuit embodiment five of the LED light light modulation;
Fig. 3 F are the concise circuit diagrams of the constant-current drive circuit embodiment six of the LED light light modulation;
Fig. 3 G are the concise circuit diagrams of the constant-current drive circuit embodiment seven of the LED light light modulation;
Fig. 4 A are the concise circuit diagrams of the constant-current drive circuit embodiment eight of the LED light light modulation;
Fig. 4 B are the concise circuit diagrams of the constant-current drive circuit embodiment nine of the LED light light modulation;
Fig. 4 C are the concise circuit diagrams of the constant-current drive circuit embodiment ten of the LED light light modulation;
Fig. 4 D are the concise circuit diagrams of the constant-current drive circuit embodiment 11 of the LED light light modulation;
Fig. 5 A are the concise circuit diagrams of the constant-current drive circuit embodiment 12 of the LED light light modulation;
Fig. 5 B are the concise circuit diagrams of the constant-current drive circuit embodiment 13 of the LED light light modulation;
Fig. 5 C are the concise circuit diagrams of the constant-current drive circuit embodiment 14 of the LED light light modulation;
Fig. 5 D are the concise circuit diagrams of the constant-current drive circuit embodiment 15 of the LED light light modulation；
Fig. 6 A are the concise circuit diagrams of the constant-current drive circuit embodiment 16 of the LED light light modulation;
Fig. 6 B are the concise circuit diagrams of the constant-current drive circuit embodiment 17 of the LED light light modulation;
Fig. 6 C are the concise circuit diagrams of the constant-current drive circuit embodiment 18 of the LED light light modulation;
Fig. 6 D are the concise circuit diagrams of the constant-current drive circuit embodiment 19 of the LED light light modulation；
Fig. 7 A are the concise circuit diagrams of the constant-current drive circuit embodiment 20 of the LED light light modulation;
Fig. 7 B are the concise circuit diagrams of the constant-current drive circuit embodiment 21 of the LED light light modulation;
Fig. 7 C are the concise circuit diagrams of the constant-current drive circuit embodiment 22 of the LED light light modulation;
Fig. 7 D are the concise circuit diagrams of the constant-current drive circuit embodiment 23 of the LED light light modulation;
Fig. 7 E are the concise circuit diagrams of the constant-current drive circuit embodiment 24 of the LED light light modulation；
Fig. 8 A are the concise circuit diagrams of the constant-current drive circuit embodiment 25 of the LED light light modulation;
Fig. 8 B are the concise circuit diagrams of the constant-current drive circuit embodiment 26 of the LED light light modulation;
Fig. 8 C are the concise circuit diagrams of the constant-current drive circuit embodiment 27 of the LED light light modulation;
Fig. 8 D are the concise circuit diagrams of the constant-current drive circuit embodiment 28 of the LED light light modulation;
Fig. 8 E are the concise circuit diagrams of the constant-current drive circuit embodiment 29 of the LED light light modulation.
【Embodiment】
The utility model is described in further detail with reference to each attached drawing.
Referring to Fig. 2A to Fig. 8 E, a kind of constant-current drive circuit of LED light light modulation, including triode transistor and LED light, institute
Stating triode transistor includes field-effect tube Q1 or triode Q1A, the LED light and the source electrode of the field-effect tube Q1 or drain electrode or
The emitter or collector of triode Q1A is electrically connected；The constant-current drive circuit of the LED light light modulation further includes and the field-effect
The voltage regulator module 100 that the base stage of the grid of pipe Q1 or triode Q1A are electrically connected, the voltage regulator module 100 by adjusting
The grid of the field-effect tube Q1 or the voltage of the base stage of triode Q1A adjust the source electrode or triode of the field-effect tube Q1
The voltage of the emitter of Q1A, thus adjust be output to LED light electric current change reach light modulation.
LED light in the utility model can be that single led or multiple LED connect, or multiple LED strings
It is in parallel again after connection.The LED light that two LED series connection are depicted in Fig. 2A, Fig. 2 B and Fig. 3 A to Fig. 6 D is used as signal；In Fig. 2 C
The LED light that a LED is only depicted into Fig. 2 F and Fig. 8 A to Fig. 8 D is used as signal.
Referring to Fig. 2 B, when the LED light is electrically connected with the source electrode of the field-effect tube Q1 or the emitter of triode Q1A
When, the current-limiting resistance RL for making the electric current of LED light more stable is in series with the branch of the LED light；In fig. 2b, three pole
Transistor is field-effect tube Q1, and field-effect tube Q1 is N-channel type field-effect tube, and VDD is the voltage of input power, the LED light
Cathode be electrically connected by current-limiting resistance RL with the source S of the field-effect tube Q1, the drain D and input power of field-effect tube Q1
Cathode be electrically connected, the anode of the LED light is electrically connected to the anode of input power, and voltage regulator module 100 is electrically connected to institute
State the grid G of field-effect tube Q1.The effect of current-limiting resistance RL is to make the electric current of LED light more stable；Such as Fig. 3 A to Fig. 6 D it
Current-limiting resistance RL is all provided with each embodiment.Referring to Fig. 2A, when the LED light and the source electrode or three of the field-effect tube Q1
When the emitter of pole pipe Q1A is electrically connected, can also there is no current-limiting resistance RL in the branch of the LED light, the LED light is direct
It is connected electrically between the source S of the field-effect tube Q1 and the anode of input power；Such as each embodiment in Fig. 3 A to Fig. 6 D
In there is no current-limiting resistance RL, also can be achieved on.
Referring to Fig. 2 C to Fig. 2 F, when the drain electrode of the LED light and the field-effect tube Q1 or the collector electricity of triode Q1A
During connection, the field-effect tube Q1 source electrode or triode Q1A emitter branch in must be in series with current-limiting resistance RL,
Such as current-limiting resistance RL must be all set in each embodiment of Fig. 8 A to Fig. 8 E.
In fig. 2 c, the triode transistor is field-effect tube Q1, and field-effect tube Q1 is N-channel type field-effect tube, and VDD is
The voltage of input power, the LED light are connected electrically between the drain D of field-effect tube Q1 and the cathode of input power, wherein institute
The anode for stating LED light is electrically connected with the drain D of the field-effect tube Q1, and current-limiting resistance RL is connected electrically in the field-effect tube Q1's
Between source S and the anode of input power, voltage regulator module 100 is electrically connected to the grid G of the field-effect tube Q1.
In figure 2d, the triode transistor is field-effect tube Q1, and field-effect tube Q1 is P-channel type field-effect tube, described
LED light is connected electrically between the drain D of field-effect tube Q1 and the anode of input power, wherein the cathode of the LED light with it is described
The drain D of field-effect tube Q1 is electrically connected, current-limiting resistance RL be connected electrically in the field-effect tube Q1 source S and input power just
Between pole, voltage regulator module 100 is electrically connected to the grid G of the field-effect tube Q1.
In Fig. 2 E, the triode transistor is triode Q1A, and triode Q1A is NPN type triode, and VDD is input electricity
The voltage in source, the LED light are connected electrically between the collector of triode Q1A and the cathode of input power, wherein the LED light
Anode be electrically connected with the collector of the triode Q1A, current-limiting resistance RL be connected electrically in the triode Q1A emitter and
Between the anode of input power, voltage regulator module 100 is electrically connected to the base stage of the triode Q1A.
In fig. 2f, the triode transistor is triode Q1A, and triode Q1A is PNP type triode, the LED light electricity
It is connected between the collector of triode Q1A and the anode of input power, wherein the cathode of the LED light and the triode
The collector of Q1A is electrically connected, current-limiting resistance RL be connected electrically in the triode Q1A emitter and input power cathode it
Between, voltage regulator module 100 is electrically connected to the base stage of the triode Q1A.
Referring to Fig. 3 A to Fig. 3 G and 8A to 8E, the voltage regulator module 100 includes adjusting using adjustable resistance described
The voltage of the grid of field-effect tube Q1 or the base stage of triode Q1A, below with embodiment one to embodiment seven and embodiment 20
Five specifically describe to embodiment 29, wherein embodiment one to LED light described in embodiment seven and the field-effect tube Q1
Source electrode or triode Q1A emitter be electrically connected, embodiment 25 to LED light described in embodiment 29 and the field
The drain electrode of effect pipe Q1 or the collector of triode Q1A are electrically connected.
Embodiment one, the constant-current drive circuit dimmed referring to Fig. 3 A, the utility model LED light, including field-effect tube Q1,
LED light, adjustable resistance R10 and current-limiting resistance RL；The cathode of the LED light passes through the current-limiting resistance RL's and field-effect tube Q1
Source S is electrically connected, and the drain D of field-effect tube Q1 is electrically connected with the cathode of input power, and the anode of the LED light is electrically connected to
The anode of input power；Adjustable resistance R10 both ends are connected electrically between the cathode of input power and anode, adjustable resistance R10 it
Sliding end is electrically connected to the grid G of the field-effect tube Q1；When adjustable resistance R10 sliding ends change, the grid of field-effect tube Q1
Pole G voltage follows change, while the output voltage of the source S of field-effect tube Q1 also followed by change, so flow through LED light
Electric current also just and then changes.The constant current driving method and circuit of this LED light light modulation of the present embodiment one are linearity light adjustings, are not had
The high frequency flicker of prior art PWM light-dimming methods and circuit；The light modulation precision of the present embodiment one is only by the change of adjustable resistance R10
The influence of rate, theoretically infinite precision, are influenced to adjust unlike prior art PWM light-dimming methods and circuit by the precision of PWM
Light precision；As long as adjustable resistance R10 change rates are infinitely small, minimum brightness is also infinitely small in theory；And the PWM of the prior art
Light modulation or controllable silicon light modulation, when being transferred to certain low-light level, cannot again reduce, macroscopic sudden strain of a muscle otherwise easily occur
It is bright.In the present embodiment one, voltage regulator module 100 is exactly adjustable resistance R10.Field-effect tube Q1 in the present embodiment one is N
Channel-type field-effect tube.VDD is the voltage of input power.
Embodiment two, referring to Fig. 3 B, the present embodiment two and embodiment one are essentially identical, are a difference in that and use adjustable resistance
R11 and fixed resistance R12 instead of adjustable resistance R10, that is, voltage regulator module 100 is adjustable resistance R11 and fixed electricity
It is connected electrically in after resistance R12, fixed resistance R12 and adjustable resistance R11 series connection between the cathode of input power and anode, adjustable resistance
Grid G at the electrical connection of R11 and fixed resistance R12 also with the field-effect tube Q1 is electrically connected.
Embodiment three, referring to Fig. 3 C, the present embodiment three and embodiment two are essentially identical, are a difference in that adjustable resistance
R11 and fixed resistance R12 are to falling, you can adjust resistance R11 to be electrically connected with the cathode of input power, fixed resistance R12 and input
The anode of power supply is electrically connected.
Example IV, referring to Fig. 3 D, the present embodiment four and embodiment two are essentially identical, are a difference in that triode Q1A
Field-effect tube Q1 is instead of, the base stage of wherein triode Q1A is connected electrically in the electrical connection of adjustable resistance R11 and fixed resistance R12
Place, the cathode of LED light is electrically connected by current-limiting resistance RL with the emitter of the triode Q1A, the collector of triode Q1A and
The cathode of input power is electrically connected.When the resistance variations of adjustable resistance R11, the base voltage of triode Q1A followed by change,
The output voltage of the emitter of triode Q1A also followed by change at the same time, and the electric current for so flowing through LED light also just and then changes.
Triode Q1A in the present embodiment four is NPN type triode.
Embodiment five, referring to Fig. 3 E, the present embodiment five and embodiment three are essentially identical, are a difference in that triode Q1A
Field-effect tube Q1 is instead of, the base stage of wherein triode Q1A is connected electrically in the electrical connection of adjustable resistance R11 and fixed resistance R12
Place, the cathode of LED light are electrically connected by current-limiting resistance RL with the cathode of input power, the anode of LED light and the hair of triode Q1A
Emitter-base bandgap grading is electrically connected, and the collector of triode Q1A is electrically connected with the anode of input power.When the resistance variations of adjustable resistance R11,
The base voltage of triode Q1A followed by change, while the output voltage of the emitter of triode Q1A also followed by change, this
The electric current that sample flows through LED light also just and then changes.Triode Q1A in the present embodiment five is PNP type triode.
Embodiment six, referring to Fig. 3 F, the present embodiment six and embodiment two are essentially identical, are a difference in that field-effect tube Q1
It is P-channel type field-effect tube, the wherein grid G of field-effect tube Q1 is still connected electrically in adjustable resistance R11's and fixed resistance R12
At electrical connection, the cathode of LED light is electrically connected by current-limiting resistance RL with the cathode of input power, the anode of LED light and field-effect
The source S of pipe Q1 is electrically connected, and the drain D of field-effect tube Q1 is electrically connected with the anode of input power.
Embodiment seven, referring to Fig. 3 G, the present embodiment seven and embodiment three are essentially identical, are a difference in that voltage adjusts mould
Block 100 further includes adjustable voltage-stabiliser tube D11 and fixed resistance R13, is electrically connected after fixed resistance R13 and adjustable voltage-stabiliser tube D11 series connection
Between the cathode and anode of input power, wherein the anode of adjustable voltage-stabiliser tube D11 connects the anode of input power, fixed resistance
R13 is electrically connected with the cathode of input power, and the grid G of field-effect tube Q1 is connected electrically in the cathode of adjustable voltage-stabiliser tube D11, adjustable steady
The detection voltage end of pressure pipe D11 is connected electrically at the electrical connection of adjustable resistance R11 and fixed resistance R12；Adjustable resistance R11 and solid
It is connected electrically in after determining resistance R12 series connection between the grid G of field-effect tube Q1 and the anode of input power, wherein fixed resistance R12
Connect the anode of input power.The model TL431 of adjustable voltage-stabiliser tube D11.
Referring to Fig. 4 A to Fig. 4 D, the voltage regulator module 100 is included using resistance 21, the resistance 22 being cascaded
With switch element 110, and the base stage of the grid of field-effect tube Q1 or triode Q1A be connected electrically in resistance 21 and resistance 22 it
Between, and adjust by the on or off of pwm signal controlling switch element 110 grid or triode of the field-effect tube Q1
The voltage of the base stage of Q1A, is specifically described with embodiment eight to embodiment 11 below, and the embodiment eight is into embodiment 11
The LED light is electrically connected with the source electrode of the field-effect tube Q1 or the emitter of triode Q1A.
Embodiment eight, referring to Fig. 4 A, the present embodiment eight and embodiment one are a difference in that voltage regulator module 100
Structure is different, and the voltage regulator module 100 of the present embodiment eight includes resistance 21, resistance 22, pwm signal and switch element
110, switch element 110 is electron conductive type switching device, including field-effect tube or triode, such as N-channel type field-effect tube；
Resistance 21, resistance 22 and switch element 110 are connected electrically between the cathode of input power and anode after being sequentially connected in series, wherein resistance
21 are electrically connected with the cathode of input power, and switch element 110 is electrically connected with the anode of input power；The grid G of field-effect tube Q1
It is connected electrically between resistance 21 and resistance 22；The on or off of pwm signal controlling switch element 110, changes field effect to reach
Should pipe Q1 grid average voltage effect；When switch element 110 is closed, the grid voltage of field-effect tube Q1 is input electricity
The voltage VDD in source, when switch element 110 turns on, the grid voltage of field-effect tube Q1 is minimum, is between resistance 21 and resistance 22
Partial pressure, in this way, changing from small to big with the pulsewidth of pwm signal, the average voltage of the grid G of field-effect tube Q1 is lower by height, institute
The voltage for stating the source electrode of field-effect tube Q1 is also correspondingly made available adjustment, thus adjust be output to LED light electric current change come
Achieve the purpose that light modulation.
Embodiment nine, referring to Fig. 4 B, the present embodiment nine and embodiment eight are essentially identical, are a difference in that scene effect pipe Q1
Grid G and the anode of input power between be electrically connected filter capacitor C1, such field-effect tube Q1 grid voltage fluctuation meeting
It is smaller.
Embodiment ten, referring to Fig. 4 C, the present embodiment ten and embodiment nine are essentially identical, are a difference in that scene effect pipe Q1
Grid G and the anode of input power between be electrically connected zener diode D21 again, wherein the cathode of zener diode D21 with
The anode of input power is electrically connected, the ceiling voltage of the grid G of such field-effect tube Q1 from the voltage VDD of input power shadow
Ring, the ceiling voltage of the grid G of field-effect tube Q1 is limited on the voltage of zener diode D21 stabilizations.
Embodiment 11, referring to Fig. 4 D, the present embodiment 11 and embodiment ten are essentially identical, are a difference in that：
1. triode Q1A instead of field-effect tube Q1, triode Q1A uses PNP type triode, wherein triode Q1A's
Base stage is connected electrically between resistance 21 and resistance 22, and the cathode of LED light is electrically connected by the cathode of current-limiting resistance RL and input power
Connect, the anode of LED light is electrically connected with the emitter of triode Q1A, and the collector of triode Q1A and the anode of input power are electrically connected
Connect；
2. switch element 110 is connected electrically between the cathode of input power and resistance 21, resistance 22 is negative with input power
Pole is electrically connected；
3. zener diode D21 is connected electrically between the grid G of scene effect pipe Q1 and the cathode of input power, wherein surely
The cathode of pressure diode D21 is electrically connected with the cathode of input power；
4. filter capacitor C1 is connected electrically between the base stage of triode Q1A and the anode of input power.
Referring to Fig. 4 D, when switch element 110 turns on, the pressure drop of the intrinsic standoff ratio zener diode D21 of resistance R21 is small,
At this moment zener diode D21 is ineffective, and the base voltage of triode Q1A is that the voltage VDD of input power subtracts resistance R21
Partial pressure；When switch element 110 is closed, the base voltage of triode Q1A is that the voltage VDD of input power subtracts zener diode
The voltage drop of D21, at this moment the voltage between the emitter of the voltage VDD of input power to triode Q1A is maximum, that is, flows through
The electric current of LED light is maximum, because at this moment the voltage between the base stage of triode Q1A and the anode of input power is than triode Q1A
Base stage and input power cathode between voltage it is small, filter capacitor C1 is connected electrically in the base stage of triode Q1A and defeated
Between the anode for entering power supply, the resistance to pressure request of filter capacitor C1 can be reduced.
Referring to Fig. 5 A to Fig. 5 D, the voltage regulator module 100 includes using diode D1 and inductance L1, and passes through PWM
The on or off of Signal-controlled switch element 110 adjusts the base stage of the grid of the field-effect tube Q1 or triode Q1A
Voltage, is specifically described with embodiment 12 to embodiment 15 below, the embodiment 12 to LED described in embodiment 15
Lamp is electrically connected with the source electrode of the field-effect tube Q1 or the emitter of triode Q1A.
Embodiment 12, referring to Fig. 5 A, the present embodiment 12 is a difference in that voltage regulator module with embodiment 11
100 structure is different, and the voltage regulator module 100 of the present embodiment 12 includes diode D1, inductance L1, pwm signal and opens
Element 110 is closed, switch element 110 is electron conductive type switching device, including field-effect tube or triode, such as N-channel type field
Effect pipe；Diode D1 and switch element 110 are connected electrically between the cathode of input power and anode after being sequentially connected in series, wherein two
The cathode of pole pipe D1 is electrically connected with the cathode of input power, and switch element 110 is electrically connected with the anode of input power；Triode
The base stage of Q1A is connected electrically between diode D1 and switch element 110 by inductance L1；Pwm signal controlling switch element 110
On or off, to have the function that to change the average voltage of the base stage of triode Q1A；The pulsewidth for adjusting pwm signal can
The base voltage of triode Q1A is adjusted, the voltage of the emitter of so described triode Q1A is also correspondingly made available adjustment, so that
The electric current that adjustment is output to LED light changes to achieve the purpose that light modulation.In the present embodiment 12, filter capacitor C1 is electrically connected
It is connected between the cathode of input power and the base stage of triode Q1A.
Embodiment 13, referring to Fig. 5 B, the present embodiment 13 is identical with embodiment dodecyl sheet, is a difference in that and is inputting
Resistance R31 is electrically connected between the cathode of power supply and the base stage of triode Q1A, effect is the resistance when switch element 110 turns off
R31 quickly draws high the base voltage of triode Q1A, to achieve the purpose that the electric current for rapidly switching off LED light.
Embodiment 14, referring to Fig. 5 C, the present embodiment 14 is identical with embodiment tritriacontyl sheet, is a difference in that：Three poles
Pipe Q1A is electrically connected using NPN type triode, the at this time collector of triode Q1A with the cathode of input power, LED light
Cathode is electrically connected by current-limiting resistance RL with the emitter of triode Q1A, and the anode of LED light and the anode of input power are electrically connected
Connect；Diode D1 and switch element 110 are also exchanged into a position in this embodiment, switch element 110 is placed on high voltage
Place；It is connected electrically in after resistance R31 and filter capacitor C1 parallel connections between the anode of input power and the base stage of triode Q1A.
Embodiment 15, referring to Fig. 5 D, the present embodiment 15 is identical with embodiment tetradecyl sheet, is a difference in that：Three poles
The collector of pipe Q1A is electrically connected to the cathode of input power；Inductance L1 and switch element 110 are connected electrically in low pressure after being sequentially connected in series
Between the cathode and anode of power vd D1, wherein switch element 110 is electrically connected with the anode of low-tension supply;The base of triode Q1A
Pole is connected electrically between inductance L1 and switch element 110 by diode D1, wherein the cathode of diode D1 and triode Q1A
Base stage be electrically connected.In the present embodiment 15, the voltage VDD of input power is far above the voltage VDD1 of low-tension supply, uses
Booster circuit carrys out the base stage power supply to triode Q1A.
Triode Q1A in the embodiment 12 of Fig. 5 A to Fig. 5 D to embodiment 15 can also use field-effect tube Q1 generations
Replace, details are not described herein.
Embodiment 16, referring to Fig. 6 A, the present embodiment is on the basis of embodiment three, is powered using electric main, whole
Electric main rectification is become pulsating direct current, the L ports of rectifier circuit B1 and N-port as the defeated of electric main by stream bridge circuit B1
Enter end, 2 ports of rectifier circuit B1（Positive output end）With 4 ports（Negative output terminal）For the direct current output two of rectifier circuit B1
End, the direct current output both ends of rectifier circuit B1 are exactly the cathode and anode of the input power of embodiment three, and the rectifier bridge is electric
The output voltage of road B1 is exactly the voltage VDD of the input power of embodiment three.Also in the cathode and anode of input power in Fig. 6 A
Between capacitance C61 in parallel.Electric main can be used to power in above-mentioned other embodiments.
Referring to Fig. 6 B to Fig. 6 D, Voltage stabilizing module 120 is set to stablize the voltage of the adjustable resistance；The Voltage stabilizing module
120 include zener diode or adjustable voltage-stabiliser tube；Specifically described below with embodiment 17 to embodiment 19.
Embodiment 17, referring to Fig. 6 B, the present embodiment 17 is identical with embodiment palmityl sheet, is a difference in that：Rectification
The positive output end of bridge circuit B1 adds Voltage stabilizing module 120, for stablizing the voltage of whole input power, including stablizes adjustable electric
The voltage of R11 is hindered, the voltage fluctuation of such electric main would not influence the stabilization of LED light electric current.
Embodiment 18, referring to Fig. 6 C, the present embodiment 18 is identical with embodiment heptadecyl sheet, is a difference in that：Voltage stabilizing
Module 120 is connected in the branch of adjustable resistance R11 and fixed resistance R12, the stable adjustable resistance R11 of Voltage stabilizing module 120 and
The voltage at fixed resistance R12 both ends, the voltage of such LED light is same to be kept stablizing；Due to adjustable resistance R11 and fixed resistance
The resistance value of R12 is very big, its electric current very little, and the voltage for stablizing adjustable resistance R11 and fixed resistance R12 both ends is easy for more.
Embodiment 19, referring to Fig. 6 D, the present embodiment is the practical application circuit diagram of embodiment 18, i.e. the present embodiment
Voltage stabilizing module 120 include resistance R63 and zener diode D63, resistance R63 and zener diode D63 composition regulator circuit
Stablize adjustable resistance R11 and the voltage at fixed resistance R12 both ends.
Embodiment 20, referring to Fig. 7 A, the present embodiment is the application extension on the basis of embodiment 19, controller and
LED light separates, and a controller controls the brightness of multiple LED light at the same time, this application is particularly suitable for having multigroup LED light on pendent lamp
Situation；LED light 1, LED light 2 and LED light 3 totally three groups of LED light, the potential point of three groups of LED light are depicted in the present embodiment
The potential point VDD2 of the output of the source S of VDD2 and field-effect tube Q1 is isopotential point.
The LED light includes the LED of the bright different colours light of two-way；In the source electrode or triode Q1A of the field-effect tube Q1
Emitter at be in series with the toggle switches of at least two gears, the LED of the different stalls control different colours light of toggle switch.
Specifically described below with embodiment 21, which is the source electrode or triode in the field-effect tube Q1
The toggle switch of three gears is provided with the emitter of Q1A, wherein toggle switch a gear is by the bright different colours of two-way
The LED of light is lighted at the same time, and the another two gear of toggle switch allows the LED of the bright different colours light of two-way individually to light respectively.
Embodiment 21, referring to Fig. 7 B, the present embodiment is to further expand application on the basis of embodiment 20,
The source S of the present embodiment scene effect pipe Q1 has been electrically connected toggle switch S1；And every group of LED light be divide into two-way, all the way entirely
It is the LED of brilliant white light, another way is the LED of bright orange light entirely.When toggle switch S1 is when middle, VDD-W and VDD- are also turned on
Y, that is, the LED of white light and the LED of yellow light are lit together, and at this moment the light of LED light is Neutral colour；When toggle switch S1 exists
During the left side, VDD-W is only connected, at this moment the LED of only white light is lit, and the light of LED light is white；When toggle switch S1 is on the right side
Bian Shi, only connects VDD-Y, and at this moment the LED of only yellow light is lit, and the light of LED light is yellow.This application of the present embodiment
Can degree of lightening, also can color temperature, and electric current is stablized, and net synchronization capability is good.
The LED light includes the LED of the bright different colours light of two-way；The voltage regulator module 100 has two, controls respectively
The LED of the bright different colours light of two-way.Specifically described below with embodiment 22 to embodiment 24.
Embodiment 22, referring to Fig. 7 C, the present embodiment is 20 base of embodiment of the embodiment eight and Fig. 7 A in Fig. 4 A
Integrated application on plinth further expands.The present embodiment is using two field-effect tube, two switch elements, four resistance and two
Pwm signal, wherein field-effect tube Q1, resistance R21, resistance R22, a switch element and PWM1 signals are controlled as dimming all the way
The LED of white light processed, field-effect tube Q2, resistance R28, resistance R29, a switch element and PWM2 signals come as another way light modulation
Control the LED of yellow light；Therefore two-way light modulation corresponds to white light and yellow light, each personal pwm signal respectively on the present embodiment controller
To control brightness, brightness and the colour temperature of multigroup multi-way LED lamp can be thus controlled with remote signal, and is not asked synchronously
Topic.
Embodiment 23, referring to Fig. 7 D, the present embodiment is the physical circuit of the controller of the embodiment 22 of Fig. 7 C
Figure.Triode T1 and T2 is respectively adopted in two switch elements of the present embodiment；PWM1 signals and PWM2 signals are all by integrated circuit
U1 is provided, and integrated circuit U1 is the Bluetooth chip of model nRF51822, can receive various Bluetooth signals, and send PWM
Signal controls triode T1 and T2, so as to adjust brightness and the colour temperature of LED light, the foot 27 of integrated circuit U1 passes through resistance R72 electricity
The base stage of triode T1 is connected to, the foot 28 of integrated circuit U1 is connected electrically in the base stage of triode T2 by resistance R73.This implementation
Field-effect tube Q3, resistance R71 and zener diode D71 composition decompression voltage regulators in example, low-dropout regulator U2 provides low
The 3.3V voltages of interference give integrated circuit U1, capacitance C71 to be connected electrically between the foot 1 of low-dropout regulator U2 and foot 2, capacitance
C72 is connected electrically between the foot 3 of low-dropout regulator U2 and foot 2, and the foot 3 of low-dropout regulator U2 exports 3.3V voltages.
Embodiment 24, referring to Fig. 7 E, the present embodiment is another tool of the controller of the embodiment 22 of Fig. 7 C
Body circuit diagram.Triode T1 and T2 is also respectively adopted in two switch elements of the present embodiment；PWM1 signals and PWM2 signals all by
Micro-control unit U1B is provided, and the foot 7 of micro-control unit U1B is connected electrically in the base stage of triode T1, micro-control by resistance R76
The foot 6 of unit U1B processed is connected electrically in the base stage of triode T2 by resistance R75；Infrared receiver J1 receiving infrared-ray signals
Micro-control unit U1B is transmitted to, pwm signal control triode T1 and T2 are sent after micro-control unit U1B decodings, so as to adjust LED
The brightness of lamp and colour temperature.Triode Q3B, resistance R71 and zener diode D71 composition decompression voltage regulators in the present embodiment,
Capacitance C71 is connected electrically between the emitter of triode Q3B and the anode of input power, and resistance R74 is connected electrically in triode Q3B
Collector and input power cathode between.
Above-described embodiment 16 to LED light described in embodiment 24 and the field-effect tube Q1 source electrode or triode
The emitter of Q1A is electrically connected.
For above-described embodiment one into embodiment 24, the LED light can not also directly be connected electrically in the field-effect
The source electrode of pipe Q1 or the emitter of triode Q1A, but drain electrode or triode Q1A of the LED light with the field-effect tube Q1
Collector be electrically connected, but the field-effect tube Q1 source electrode or triode Q1A emitter branch in must connect
Limited leakage resistance RL, details are not described herein.
Embodiment 25, referring to Fig. 8 A, the embodiment one of the present embodiment and Fig. 3 A is essentially identical, is a difference in that described
LED light is electrically connected with the drain electrode of the field-effect tube Q1, be specially the LED light be connected electrically in field-effect tube Q1 drain D and
Between the cathode of input power, wherein the anode of the LED light is electrically connected with the drain D of the field-effect tube Q1.
Embodiment 26, referring to Fig. 8 B, the present embodiment is identical with the embodiment pentacosyl sheet of Fig. 8 A, is a difference in that
Voltage stabilizing module 120 is also electrically connected between adjustable resistance R10 and the cathode of input power, is also just said, the voltage of the present embodiment
It is adjustable resistance R10 and Voltage stabilizing module 120 to adjust module 100.
Embodiment 27, referring to Fig. 8 C, the present embodiment is identical with the embodiment hexacosyl sheet of Fig. 8 B, is a difference in that
Voltage stabilizing module 120 employs specific circuit, i.e. the Voltage stabilizing module 120 of the present embodiment includes resistance R63 and zener diode
D63, resistance R63 and zener diode D63 are electrically connected in series between the cathode of input power and anode, wherein zener diode
The anode of D63 is electrically connected with the anode of input power, and adjustable resistance R10 one end is electrically connected with the cathode of zener diode D63, electricity
Hinder the voltage that the regulator circuit that R63 and zener diode D63 is formed stablizes adjustable resistance R10 both ends.
Embodiment 28, referring to Fig. 8 D, the embodiment seven of the present embodiment and Fig. 3 G is essentially identical, is a difference in that described
LED light is electrically connected with the drain electrode of the field-effect tube Q1, be specially the LED light be connected electrically in field-effect tube Q1 drain D and
Between the cathode of input power, wherein the anode of the LED light is electrically connected with the drain D of the field-effect tube Q1.
Embodiment 29, referring to Fig. 8 E, the present embodiment is identical with the two heptadecyl sheet of embodiment of Fig. 8 C, is a difference in that
Load LED lamp is different, and the LED light of the present embodiment includes the LED of the bright different colours light of two-way, controlled by toggle switch S1,
I.e. the present embodiment has been electrically connected toggle switch S1 in the cathode of input power, and LED light divide into two-way, is brilliant white light all the way
LED, another way is the LED of bright orange light, and the drain D of the anode of two paths of LED lamp all with the field-effect tube Q1 is electrically connected；White light
LED and the LED of yellow light can be lit together, at this moment the light of LED light is Neutral colour；Can also there was only the LED quilts of white light
Light, at this moment the light of LED light is white；The LED that can also there was only yellow light is lit, and at this moment the light of LED light is yellow.
Field-effect tube Q1 in the embodiment 25 of Fig. 8 A to Fig. 8 E to embodiment 29 can also use triode Q1A
Instead of details are not described herein.
The utility model proposes another mentality of designing, and field-effect is controlled without PWM light modulations or controllable silicon light modulation
ON time and the deadline of pipe or triode, but by voltage regulator module 100 adjust field-effect tube Q1 grid or
The voltage of the base stage of triode Q1A and then to adjust the voltage of the emitter of the source electrode of field-effect tube Q1 or triode Q1A, so that
The electric current that adjustment is output to LED light changes to achieve the purpose that light modulation;During light modulation, it can be transferred to very low bright
Macroscopic flicker will not occur in degree, LED light；With circuit structure is simple, cost is low, light modulation is easy and safe and reliable etc.
Advantage.
Embodiment described above only expresses the preferred embodiment of the utility model, its description is more specific and detailed,
But it should not be interpreted as limiting the scope of the present invention;It should be appreciated that for the common of this area
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model;Therefore, all equivalents done with the utility model claims scope and modification,
The covering scope of the utility model claims should be belonged to.
Claims (9)
1. a kind of constant-current drive circuit of LED light light modulation, including triode transistor and LED light, the triode transistor include field
Effect pipe Q1 or triode Q1A, the LED light and the source electrode or the emitter of drain electrode or triode Q1A of the field-effect tube Q1
Or collector is electrically connected；It is characterized in that：
Further include the voltage regulator module being electrically connected with the base stage of the grid of the field-effect tube Q1 or triode Q1A（100）, should
Voltage regulator module（100）By adjusting the field-effect tube Q1 grid or triode Q1A base stage voltage to adjust
The voltage of the source electrode of field-effect tube Q1 or the emitter of triode Q1A is stated, is changed so as to adjust and be output to the electric current of LED light
To reach light modulation.
2. the constant-current drive circuit of LED light light modulation according to claim 1, it is characterised in that：
The voltage regulator module（100）Grid or triode including adjusting the field-effect tube Q1 using adjustable resistance
The voltage of the base stage of Q1A.
3. the constant-current drive circuit of LED light light modulation according to claim 2, it is characterised in that：
Voltage stabilizing module is set（120）To stablize the voltage of the adjustable resistance.
4. the constant-current drive circuit of LED light light modulation according to claim 3, it is characterised in that：
The Voltage stabilizing module（120）Including zener diode or adjustable voltage-stabiliser tube.
5. the constant-current drive circuit of LED light light modulation according to claim 1, it is characterised in that：
The voltage regulator module（100）Including using resistance 21, resistance 22 and the switch element being cascaded, and field effect
Should the grid of pipe Q1 or the base stage of triode Q1A be connected electrically between resistance 21 and resistance 22, and pass through pwm signal controlling switch
The on or off of element adjusts the voltage of the base stage of the grid of the field-effect tube Q1 or triode Q1A.
6. the constant-current drive circuit of LED light light modulation according to claim 1, it is characterised in that：
The voltage regulator module（100）Including using diode D1 and inductance L1, and pass through pwm signal controlling switch element
On or off adjusts the voltage of the base stage of the grid of the field-effect tube Q1 or triode Q1A.
7. the constant-current drive circuit of LED light light modulation according to claim 1, it is characterised in that：
When the LED light is electrically connected with the source electrode of the field-effect tube Q1 or the emitter of triode Q1A, in the LED light
Branch in be in series with the current-limiting resistance RL for making the electric current of LED light more stable；Either, when the LED light and the field-effect
When the drain electrode of pipe Q1 or the collector of triode Q1A are electrically connected, in the transmitting of the source electrode or triode Q1A of the field-effect tube Q1
Required series limiting resistor RL in the branch of pole.
8. the constant-current drive circuit dimmed according to any one of them LED light of claim 1 to 7, it is characterised in that：
The LED light includes the LED of the bright different colours light of two-way；In the source electrode of the field-effect tube Q1 or the hair of triode Q1A
The toggle switch of at least two gears, the LED of the different stalls control different colours light of toggle switch are in series with emitter-base bandgap grading.
9. the constant-current drive circuit dimmed according to any one of them LED light of claim 1 to 7, it is characterised in that：
The LED light includes the LED of the bright different colours light of two-way；The voltage regulator module（100）There are two, control two respectively
The LED of the bright different colours light in road.
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| CN201710038117 | 2017-01-19 | ||
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| CN201721251032.4U Active CN207340239U (en) | 2017-01-19 | 2017-09-27 | The constant-current drive circuit of LED light light modulation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109392224A (en) * | 2018-10-22 | 2019-02-26 | 广州华欣电子科技有限公司 | A kind of current control circuit and electronic equipment |
| CN110831287A (en) * | 2019-12-13 | 2020-02-21 | 上海顿格电子贸易有限公司 | Driving circuit for LED lamp current distribution |
| CN111343765A (en) * | 2020-03-04 | 2020-06-26 | 江苏云与雾物联科技有限公司 | Intelligent control system of plant lamp |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106852B (en) * | 2007-06-25 | 2010-12-08 | 四川大学 | Current constant and light adjusting control circuit for luminescent LED array |
| CN102917486A (en) * | 2011-08-02 | 2013-02-06 | 北京同步科技有限公司 | LED lamp adjustable in luminance and color temperature |
| CN202634833U (en) * | 2012-06-12 | 2012-12-26 | 潮州市晟晖陶瓷有限公司 | Diming circuit for light-emitting diode (LED) lamp |
| CN202634846U (en) * | 2012-07-02 | 2012-12-26 | 陕西科技大学 | Microwave induction light modulator |
| CN203136242U (en) * | 2013-01-05 | 2013-08-14 | 广州奥迪通用照明有限公司 | LED constant-current circuit with PWM light modulation |
| CN103929845B (en) * | 2013-01-16 | 2016-06-29 | 陕西亚成微电子股份有限公司 | It is suitable for the light adjusting circuit of linear low density LED driver |
| CN204270639U (en) * | 2014-11-21 | 2015-04-15 | 东莞帝光电子科技实业有限公司 | Liquid crystal display LED backlight dynamic light adjustment device |
| CN104519645B (en) * | 2014-11-27 | 2019-01-08 | 上海航空电器有限公司 | A kind of guide-lighting drive circuit based on PWM light modulation |
| CN204721658U (en) * | 2015-05-25 | 2015-10-21 | 延锋伟世通电子科技（南京）有限公司 | With the automobile multiple constant current LED illumination circuit of temperature detection |
| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
-
2017
- 2017-09-27 CN CN201710889485.8A patent/CN108235502A/en not_active Withdrawn
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
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