CN110536515A - One kind can simply set initial current and to the adjustable light adjusting circuit of initial current - Google Patents
One kind can simply set initial current and to the adjustable light adjusting circuit of initial current Download PDFInfo
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- CN110536515A CN110536515A CN201910895294.1A CN201910895294A CN110536515A CN 110536515 A CN110536515 A CN 110536515A CN 201910895294 A CN201910895294 A CN 201910895294A CN 110536515 A CN110536515 A CN 110536515A
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Abstract
Initial current can be simply set the invention discloses one kind and to the adjustable light adjusting circuit of initial current, including resistance R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, capacitor C1, C2, C3, diode D1, D2, D3, D4, D5, D6, D7, amplifier X1, X2, triode Q1, Q2, Q3, power supply V1, V2, triangular signal Tri, input signal X1-inn, voltage signal V0, Vi and Vi2.The utility model has the advantages that setting the initial current of power supply by adjustable resistance using two-way operational amplifier, carrying out light modulation setting by electric current of the external dimmer signal to setting, the setting of power supply initial current can be achieved and to the current adjustment after setting, at low cost, degree of regulation is high, adjusts easy.
Description
Technical field
The present invention relates to LED power technical fields, it particularly relates to which one kind can simply set initial current and to initial
The light adjusting circuit of current adjustment.
Background technique
Currently, in the LED power light modulation for doing constant current output by the way of traditional, if necessary to the initial electricity to power supply
Stream is configured, and is dimmed to the electric current after setting, needs to realize by MCU.As shown in fig. 6, the default maximum of power supply is defeated
It is out Imax, MCU sets an initial output electric current I by softwareo', MCU set by software one it is initial defeated
Electric current I outo', Io'=Imax* Z (Z is the initial value of MCU setting, value range 0%-100%), samples by AD, to outside
The dim signal of input is handled, and exports a linear adjustable pwm signal to realize initial current light modulation, electric current after light modulation
Io=Io' * K (K is the PWM duty cycle of MCU output, value range 0%-100%), i.e. final output electric current Io=Imax*Z*K。
Conventional method is converted using MCU, and MCU needs A/D converter circuit and software design, and setting is initial every time
Electric current needs changing section program, when operating cost, higher cost.
For the problems in the relevant technologies, currently no effective solution has been proposed.
Summary of the invention
For the problems in the relevant technologies, the present invention proposes that one kind can simply set initial current and adjustable to initial current
Light adjusting circuit, to overcome above-mentioned technical problem present in existing the relevant technologies.
For this purpose, the specific technical solution that the present invention uses is as follows:
One kind can simply set initial current and to the adjustable light adjusting circuit of initial current, including resistance R1, resistance R2, electricity
Hinder R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, adjustable electric
Hinder R13, adjustable resistance R14, capacitor C1, capacitor C2, capacitor C3, diode D1, diode D2, diode D3, diode D4, two
Pole pipe D5, diode D6, diode D7, amplifier X1, amplifier X2, triode Q1, triode Q2, triode Q3, power supply electricity
Source V1, power supply V2, triangular signal Tri, input signal X1-inn, voltage signal V0, voltage signal Vi and voltage signal
Vi2；
Wherein, the voltage signal V0 is successively connect with the first end of one end of the resistance R6 and the amplifier X2,
The other end of the resistance R6 successively with the second end of the amplifier X2, the collector of the triode Q3, the resistance R5
One end, one end of positive, described resistance R4 of the diode D1, one end of the resistance R3, the power supply V1
One end of positive, the described resistance R2, the second end of the amplifier X1, one end of the resistance R1, the resistance R3 it is another
The cathode connection at end, the cathode of the diode D6 and the diode D3, and the cathode ground connection of the power supply V1；
The third end of the amplifier X2 successively one end, described with one end of the adjustable resistance R14, the capacitor C2
The cathode of power supply V2, one end of the adjustable resistance R13, one end of the resistance R10, the diode D6 anode,
One end connect and ground at the third end of the amplifier X1, one end of the capacitor C3 and resistance R11, the amplifier X2's
4th end is connect with the triangular signal Tri；
The 5th end of the amplifier X2 successively with the voltage signal Vi2, one end of the resistance R9 and the resistance
One end of R12 connects, and the other end of the resistance R12 is connect with the other end of the adjustable resistance R14；The resistance R9's
The other end is successively connect with the other end of one end of the resistance R8 and the capacitor C2；The other end of the resistance R8 successively with
The anode connection of the voltage signal Vi, the emitter of the triode Q3 and the diode D7；The diode D7's is negative
Pole is successively connect with the cathode of positive, described diode D4 of the power supply V2 and the other end of the adjustable resistance R13；
The positive successively collector and the diode D3 with the base stage of the triode Q3, the triode Q2 of the diode D4
Anode connection；The emitter of the triode Q2 is connect with the other end of the resistance R5, the base stage of the triode Q2 according to
The secondary other end with the cathode of the diode D2, the base stage of the triode Q1 and the resistance R10 is connect；The diode
The anode of D2 is connect with the cathode of the diode D1；The other end of the emitter of the triode Q1 and the resistance R4 connect
It connects, the collector of the triode Q1 successively other end, the triangular wave with positive, the described capacitor C3 of the diode D5
The 4th end of signal Tri, the input signal X1-inn and the amplifier X1 connect；The cathode of the diode D5 successively with
The first end of the amplifier X1, the other end of the resistance R2, one end of the capacitor C1 and the resistance R7 one end connect
It connects；The other end of the capacitor C1 successively with the other end of the resistance R1, the 5th end of the amplifier X1, the resistance
The connection of the other end of the other end of R11 and the resistance R7.
Further, the diode D6 is zener diode, and the model BZX79-10 of the diode D6.
Further, the model of the amplifier X1 and the model of the amplifier X2 are LM293.
Further, the triode Q1 and triode Q2 is PNP type triode.
Further, the triode Q3 is NPN type triode.
The invention has the benefit that the present invention, which provides one kind, can simply set initial current and adjustable to initial current
Light adjusting circuit sets the initial current of power supply by adjustable resistance using two-way operational amplifier, is passing through external dimmer signal
Light modulation setting is carried out to the electric current of setting, it can be achieved that power supply initial current setting and to the current adjustment after setting, at low cost,
Degree of regulation is high, adjusts easy.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is that one kind according to an embodiment of the present invention can simply set initial current and to initial current adjustable light modulation electricity
The schematic diagram on road；
Fig. 2 is that one kind according to an embodiment of the present invention can simply set initial current and to initial current adjustable light modulation electricity
The operational flow diagram on road；
Fig. 3 is that one kind according to an embodiment of the present invention can simply set initial current and to initial current adjustable light modulation electricity
One of the simulation waveform on road；
Fig. 4 is that one kind according to an embodiment of the present invention can simply set initial current and to initial current adjustable light modulation electricity
The two of the simulation waveform on road；
Fig. 5 is that one kind according to an embodiment of the present invention can simply set initial current and to initial current adjustable light modulation electricity
The three of the simulation waveform on road；
Fig. 6 is light modulation schematic diagram in the prior art.
Specific embodiment
To further illustrate that each embodiment, the present invention are provided with attached drawing, these attached drawings are that the invention discloses one of content
Point, mainly to illustrate embodiment, and the associated description of specification can be cooperated to explain the operation principles of embodiment, cooperation ginseng
Examine these contents, those of ordinary skill in the art will be understood that other possible embodiments and advantages of the present invention, in figure
Component be not necessarily to scale, and similar component symbol is conventionally used to indicate similar component.
According to an embodiment of the invention, initial current can simply be set and to the adjustable light modulation of initial current by providing one kind
Circuit.
Now in conjunction with the drawings and specific embodiments, the present invention is further described, as shown in Figs. 1-5, implements according to the present invention
Example can simply set initial current and to the adjustable light adjusting circuit of initial current, including resistance R1, resistance R2, resistance R3, electricity
Hinder R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, adjustable resistance R13,
Adjustable resistance R14, capacitor C1, capacitor C2, capacitor C3, diode D1, diode D2, diode D3, diode D4, diode
D5, diode D6, diode D7, amplifier X1, amplifier X2, triode Q1, triode Q2, triode Q3, power supply V1,
Power supply V2, triangular signal Tri, input signal X1-inn, voltage signal V0, voltage signal Vi and voltage signal Vi2；
Wherein, the voltage signal V0 is successively connect with the first end of one end of the resistance R6 and the amplifier X2,
The other end of the resistance R6 successively with the second end of the amplifier X2, the collector of the triode Q3, the resistance R5
One end, one end of positive, described resistance R4 of the diode D1, one end of the resistance R3, the power supply V1
One end of positive, the described resistance R2, the second end of the amplifier X1, one end of the resistance R1, the resistance R3 it is another
The cathode connection at end, the cathode of the diode D6 and the diode D3, and the cathode ground connection of the power supply V1；
The third end of the amplifier X2 successively one end, described with one end of the adjustable resistance R14, the capacitor C2
The cathode of power supply V2, one end of the adjustable resistance R13, one end of the resistance R10, the diode D6 anode,
One end connect and ground at the third end of the amplifier X1, one end of the capacitor C3 and resistance R11, the amplifier X2's
4th end is connect with the triangular signal Tri；
The 5th end of the amplifier X2 successively with the voltage signal Vi2, one end of the resistance R9 and the resistance
One end of R12 connects, and the other end of the resistance R12 is connect with the other end of the adjustable resistance R14；The resistance R9's
The other end is successively connect with the other end of one end of the resistance R8 and the capacitor C2；The other end of the resistance R8 successively with
The anode connection of the voltage signal Vi, the emitter of the triode Q3 and the diode D7；The diode D7's is negative
Pole is successively connect with the cathode of positive, described diode D4 of the power supply V2 and the other end of the adjustable resistance R13；
The positive successively collector and the diode D3 with the base stage of the triode Q3, the triode Q2 of the diode D4
Anode connection；The emitter of the triode Q2 is connect with the other end of the resistance R5, the base stage of the triode Q2 according to
The secondary other end with the cathode of the diode D2, the base stage of the triode Q1 and the resistance R10 is connect；The diode
The anode of D2 is connect with the cathode of the diode D1；The other end of the emitter of the triode Q1 and the resistance R4 connect
It connects, the collector of the triode Q1 successively other end, the triangular wave with positive, the described capacitor C3 of the diode D5
The 4th end of signal Tri, the input signal X1-inn and the amplifier X1 connect；The cathode of the diode D5 successively with
The first end of the amplifier X1, the other end of the resistance R2, one end of the capacitor C1 and the resistance R7 one end connect
It connects；The other end of the capacitor C1 successively with the other end of the resistance R1, the 5th end of the amplifier X1, the resistance
The connection of the other end of the other end of R11 and the resistance R7.
In one embodiment, for above-mentioned diode D6, the diode D6 is zener diode, and described two
The model BZX79-10 of pole pipe D6.
In one embodiment, for above-mentioned amplifier X1, the model of the amplifier X1 and the amplifier X2
Model be LM293.
In one embodiment, for above-mentioned triode Q1, the triode Q1 and the triode Q2 are PNP
Type triode.
In one embodiment, for above-mentioned triode Q3, the triode Q3 is NPN type triode.
In order to facilitate above-mentioned technical proposal of the invention is understood, below just present invention working principle in the actual process or
Person's mode of operation is described in detail.
In practical application, the present invention realizes simulation letter using a two-way operational amplifier and part peripheral circuit
Number conversion pwm signal, power supply V1 is supply voltage, and power supply V2 and resistance R13 be an externally input analog signal, is amplified
Device X1 is as triangular-wave generator, and road amplifier X2 is as comparator, through triangular signal Tri compared with voltage signal Vi2
And pull-up resistor R6 exports the pwm signal of a fixed frequency:
1. triangular wave production principle: power supply V1 is produced by resistance R1 and triode Q1, diode D2 and diode D3
A raw constant charging current charges to capacitor C1, and capacitor C1 voltage constantly increases, when the voltage of capacitor C1 is higher than resistance R2
When voltage, amplifier X1 exports low level, and capacitor C1 is discharged by diode D1, by generating to the continuous charge and discharge of capacitor C1
The triangular signal Tri of a cycle, charging time are determined by charging current and capacitor C1 capacitance.Simulation waveform such as Fig. 3 institute
Show:
2. when not having external input dim signal: voltage signal Vi2 voltage is to pass through voltage-stabiliser tube D6 by power supply V1
After pressure stabilizing, as obtained by resistance R8, resistance R9, resistance R12 and adjustable resistance R14 partial pressure, then carried out with triangular signal Tri
Compare (Fig. 4), obtains the pwm signal (Fig. 5) of a fixed frequency in output end vo, the duty ratio of pwm signal is by voltage signal
The amplitude of Vi2 determines, i.e., is determined by adjustable resistance R14, by adjusting the pwm signal of adjustable resistance R14 generation for the time being with A come table
Show, range can be from 0%-100%.
3. when R14 is fixed resistance value:
1) when external input signal is adjustable resistance R13, power supply V1 passes through diode D2, diode D3, triode
Q2 and resistance R10 generates a constant current source, and the resistance value by adjusting resistance R10 sets an electric current I1, I1Pass through resistance
R13 generate a voltage VR13, voltage VR13 pass through diode D7 clamp voltage signal Vi after by resistance R8, resistance R9, electricity
Resistance R12 and resistance R14 divides to obtain Vi2；
2) when external input signal is power supply V2, after power supply V2 passes through diode D7 clamp voltage signal Vi
It divides to obtain voltage signal Vi2 by resistance R8, resistance R9, resistance R12 and resistance R14；
3) when external input signal be pwm signal when, by diode D7 clamper make voltage signal Vi become duty ratio with
The consistent pwm signal of pwm signal is inputted, then by resistance R8, after capacitor C2 filtering, is divided through resistance R9, resistance R12, resistance R14
After obtain voltage signal Vi2；Voltage signal Vi2 is compared with triangular wave Tri, obtains one in the voltage signal Vo of output end
The duty ratio of the PWM waveform of fixed frequency, pwm signal is determined by the amplitude of voltage signal Vi2, that is, is input from the outside signal and is determined
It is fixed.The pwm signal for being input from the outside signal generation indicates that range can be from 0%-100% for the time being with B.
4. assuming the initial output electric current I of power supplymaxIt indicates, by adjusting adjustable resistance R14 and adjusting input signal
(voltage signal magnitude, resistance, pwm signal duty ratio) adjustable different output electric current, regulative mode are as follows:
1) not external dim signal, when adjusting adjustable resistance R14, the output electric current Io of power supply1=Imax* A (A value 0%-
100%)；
2) external dim signal, when not changing R14 resistance value, the output electric current Io of power supply2=Imax* B (B value 0%-
100%)；
3) when external signal and resistance R14 resistance value change jointly, the output electric current Io=I of power supplymax* (A, B's takes A*B
It is worth range 0%-100%).
In conclusion the present invention, which provides one kind, can simply set initial current by means of above-mentioned technical proposal of the invention
And the initial current of power supply is set by adjustable resistance using two-way operational amplifier to the adjustable light adjusting circuit of initial current,
Carried out by electric current of the external dimmer signal to setting light modulation setting, it can be achieved that power supply initial current setting and to setting after
Current adjustment, at low cost, degree of regulation is high, adjusts easy.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. one kind can simply set initial current and to the adjustable light adjusting circuit of initial current, which is characterized in that including resistance R1,
Resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance
R12, adjustable resistance R13, adjustable resistance R14, capacitor C1, capacitor C2, capacitor C3, diode D1, diode D2, diode D3,
Diode D4, diode D5, diode D6, diode D7, amplifier X1, amplifier X2, triode Q1, triode Q2, three poles
Pipe Q3, power supply V1, power supply V2, triangular signal Tri, input signal X1-inn, voltage signal V0, voltage signal Vi
And voltage signal Vi2；
Wherein, the voltage signal V0 is successively connect with the first end of one end of the resistance R6 and the amplifier X2, described
The other end of resistance R6 successively with the second end of the amplifier X2, the collector of the triode Q3, the resistance R5 one
End, one end of positive, described resistance R4 of the diode D1, one end of the resistance R3, the power supply V1 anode,
One end of the resistance R2, the second end of the amplifier X1, one end of the resistance R1, the other end of the resistance R3, institute
State the cathode connection of the cathode and the diode D3 of diode D6, and the cathode ground connection of the power supply V1；
The third end of the amplifier X2 successively with one end of the adjustable resistance R14, one end of the capacitor C2, the power supply
The cathode of power supply V2, one end of the adjustable resistance R13, one end of the resistance R10, the diode D6 it is positive, described
One end connect and ground at the third end of amplifier X1, one end of the capacitor C3 and resistance R11, the 4th of the amplifier X2 the
End is connect with the triangular signal Tri；
The 5th end of the amplifier X2 successively with the voltage signal Vi2, one end of the resistance R9 and the resistance R12
One end connection, and the other end of the resistance R12 is connect with the other end of the adjustable resistance R14；The resistance R9's is another
End is successively connect with the other end of one end of the resistance R8 and the capacitor C2；The other end of the resistance R8 successively with it is described
The anode connection of voltage signal Vi, the emitter of the triode Q3 and the diode D7；The cathode of the diode D7 according to
It is secondary to be connect with the cathode of positive, described diode D4 of the power supply V2 and the other end of the adjustable resistance R13；It is described
Diode D4 anode successively with the base stage of the triode Q3, the collector of the triode Q2 and the diode D3 just
Pole connection；The emitter of the triode Q2 is connect with the other end of the resistance R5, the base stage of the triode Q2 successively with
The other end of the cathode of the diode D2, the base stage of the triode Q1 and the resistance R10 connects；The diode D2's
The positive cathode with the diode D1 is connect；The emitter of the triode Q1 is connect with the other end of the resistance R4, institute
State the collector of the triode Q1 successively other end, the triangular signal with positive, the described capacitor C3 of the diode D5
The 4th end of Tri, the input signal X1-inn and the amplifier X1 connect；The cathode of the diode D5 successively with it is described
One end connection of the first end of amplifier X1, the other end of the resistance R2, one end of the capacitor C1 and the resistance R7；Institute
State the other end of capacitor C1 successively with the other end of the resistance R1, the 5th end of the amplifier X1, the resistance R11 it is another
The connection of the other end of one end and the resistance R7.
2. one kind according to claim 1 can simply set initial current and to the adjustable light adjusting circuit of initial current,
It is characterized in that, the diode D6 is zener diode, and the model BZX79-10 of the diode D6.
3. one kind according to claim 1 can simply set initial current and to the adjustable light adjusting circuit of initial current,
It is characterized in that, the model of the model of the amplifier X1 and the amplifier X2 are LM293.
4. one kind according to claim 1 can simply set initial current and to the adjustable light adjusting circuit of initial current,
It is characterized in that, the triode Q1 and the triode Q2 are PNP type triode.
5. one kind according to claim 1 can simply set initial current and to the adjustable light adjusting circuit of initial current,
It is characterized in that, the triode Q3 is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895294.1A CN110536515B (en) | 2019-09-20 | Dimming circuit capable of simply setting initial current and adjusting initial current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895294.1A CN110536515B (en) | 2019-09-20 | Dimming circuit capable of simply setting initial current and adjusting initial current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110536515A true CN110536515A (en) | 2019-12-03 |
| CN110536515B CN110536515B (en) | 2024-05-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106028511A (en) * | 2016-05-30 | 2016-10-12 | 上海典芯半导体有限公司 | LED stepless dimming system |
| CN107182148A (en) * | 2017-06-30 | 2017-09-19 | 上海灿瑞科技股份有限公司 | A kind of DC DC LED drive circuits dimmed based on PWM |
| CN207443177U (en) * | 2017-11-13 | 2018-06-01 | 谢哲澜 | A kind of control circuit of tunable optical while color-temperature regulating |
| CN207543377U (en) * | 2017-11-28 | 2018-06-26 | 北京合众铭科技有限公司 | A kind of Dimmable LED constant-current drive circuit |
| CN108551698A (en) * | 2018-03-29 | 2018-09-18 | 大山科技有限公司 | Composite smart system |
| CN210579339U (en) * | 2019-09-20 | 2020-05-19 | 深圳瓦特智汇科技有限公司 | Dimming circuit capable of simply setting initial current and adjusting initial current |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106028511A (en) * | 2016-05-30 | 2016-10-12 | 上海典芯半导体有限公司 | LED stepless dimming system |
| CN107182148A (en) * | 2017-06-30 | 2017-09-19 | 上海灿瑞科技股份有限公司 | A kind of DC DC LED drive circuits dimmed based on PWM |
| CN207443177U (en) * | 2017-11-13 | 2018-06-01 | 谢哲澜 | A kind of control circuit of tunable optical while color-temperature regulating |
| CN207543377U (en) * | 2017-11-28 | 2018-06-26 | 北京合众铭科技有限公司 | A kind of Dimmable LED constant-current drive circuit |
| CN108551698A (en) * | 2018-03-29 | 2018-09-18 | 大山科技有限公司 | Composite smart system |
| CN210579339U (en) * | 2019-09-20 | 2020-05-19 | 深圳瓦特智汇科技有限公司 | Dimming circuit capable of simply setting initial current and adjusting initial current |
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