CN209017343U - A kind of light modulation toning LED isolation constant-current driving power supply - Google Patents
A kind of light modulation toning LED isolation constant-current driving power supply Download PDFInfo
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- CN209017343U CN209017343U CN201821329050.4U CN201821329050U CN209017343U CN 209017343 U CN209017343 U CN 209017343U CN 201821329050 U CN201821329050 U CN 201821329050U CN 209017343 U CN209017343 U CN 209017343U
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Abstract
The utility model discloses a kind of light modulation toning LED, and constant-current driving power supply is isolated.The power supply includes: protection circuit, EMI filter circuit, rectification circuit, voltage regulator circuit, optical coupling isolation circuit, control module, LED light source, LED colour temperature adjusts circui and LED luminance adjust circuit, electric main is successively through overprotection circuit, after EMI filter circuit and rectification circuit, bus high direct voltage is provided, control module issues the independent pwm control signal of two-way, the light modulation pin of the LED constant current control chip in the LED isolated drive circuit of tunable optical with dimming function is directly controlled all the way, carry out LED light source load light modulation, another way is converted into the pwm control signal of two complete reverse phases by the simple peripheral cell such as optocoupler, by the quick opening and closing of control output switching tube MOS, current ratio is exported to adjust the lamp bead of just white and two kinds of colour temperatures of warm white.Constant-current driving power supply is isolated in light modulation toning LED provided by the utility model, has load compatibility strong, the advantage that lamp bead light decay is slow and low energy consumption.
Description
Technical field
The utility model relates to LED brightness-adjusting lighting device fields, drive more particularly to a kind of light modulation toning LED isolation constant current
Dynamic power supply.
Background technique
Current generation, consumer have been not content with i.e. bright simple illumination of turning on light, meanwhile, based on semiconductor technology
LED light brings unlimited development space to intelligentized control method.On this basis, light modulation toning LED light is come into being.
Light modulation: brightness is adjustable from 3%-100%, and common scene as looked after 3% moonlight of children at night, when seeing TV
With 30% warm white, when dinner and party, uses 100% warm white.
Toning: being adjusted, the just white attention that can promote people between colour temperature is white in warm white and just, is suitable for reading learning；It is warm
It is white that people is allowed to feel to loosen, it is suitble to the scene of amusement and recreation.It is certainly just white to be also suitable for hot weather due to the variation of color,
And warm white allows people more to have warmness in winter.
From the above, it can be seen that " brightness " and " colour temperature " can be with freely regulated LED lamp, by suitable family, the various fields of office
Scape.This kind of lamps and lanterns will replace common LED lamp to become, the choosing of the main force of house decoration, be LED illumination industry developing direction it
One.
Currently, the difference of light modulation toning lamps and lanterns in the prior art and common LED lamps and lanterns is mainly following two points:
1. dimming toning lamp has just white and two kinds of colour temperatures of warm white lamp bead, also there is double-colored lamp bead；
2. light modulation toning lamps and lanterns use light modulation toning power supply: light modulation toning power supply is output two-way electric current, is lighted all the way warm
White lamp bead, another way light just white lamp bead.By adjusting the size and ratio of two-way electric current, different brightness and difference may be implemented
Colour temperature.
The light modulation toning isolated power supply of development & production currently on the market, mainly uses LED constant current constant voltage source, in secondary
Increase by two output switching tube MOS frameworks.By the quick opening and closing of control output switching tube MOS.In light modulation toning
The early stage of development, this traditional and mature framework have been introduced into the LED driving industry based on " constant-current source ", have become first generation intelligence
The power supply that can be illuminated.But this LED constant current constant voltage source, there are following disadvantages:
Firstly, main power source enters constant voltage mode when exporting two switch MOS does not have fully on.In output two
When switch MOS is connected, it is just in constant current mode.That is it is exported in the lamp bead for adjusting just white and two kinds of colour temperatures of warm white
When current ratio (in dimming process), LED lamp bead is all work in pressure constant state, easily cause in this way lamp bead light decay compared with
Fastly, the problems such as easily being flashed after aging.
Secondly, output poor compatibility needs the conducting voltage deviation in view of lamp bead to confirm due to the presence of constant pressure point,
Highest conducting voltage of the power supply after minimum conducting voltage and long-term ageing can work normally, so just can be to avoid long-term big
There is quality abnormal in batch use.
Again, the pwm control signal module of two output switching tube MOS drivings is provided, positioned at the secondary of power supply, to make
It is high at the stand-by power consumption of power supply, it is unable to satisfy Energy Star standard.
Utility model content
The purpose of the utility model is to provide a kind of light modulation toning LED, and constant-current driving power supply is isolated, and has load compatibility
By force, the advantage that lamp bead light decay is slow and low energy consumption.
To achieve the above object, the utility model provides following scheme:
A kind of light modulation toning LED is isolated constant-current driving power supply, and the power supply includes: protection circuit, EMI filter circuit, whole
Current circuit, voltage regulator circuit, optical coupling isolation circuit, control module, LED light source feeder ear, LED colour temperature adjusts circui and LED luminance
Circuit is adjusted, the output end of the protection circuit is connected with the input terminal of the EMI filter circuit, the EMI filter circuit
Output end be connected with the input terminal of the rectification circuit, electric main successively pass through the protection circuit, EMI filter circuit
After rectification circuit, adjusts circuit for the voltage regulator circuit and LED luminance and bus high direct voltage is provided；
The LED light source feeder ear includes warm white light source feeder ear and positive white light source feeder ear；
The voltage regulator circuit is connected with the output end of the rectification circuit, and the voltage regulator circuit is defeated to the rectification circuit
Voltage out is depressured, and the stabilization of maintenance voltage signal；
The control module generates control LED luminance all the way and adjusts the pwm control signal of circuit and control LED colour temperature all the way
The pwm control signal for adjusting circuit, is denoted as brightness pwm control signal and colour temperature pwm control signal respectively；
The input terminal that the LED luminance adjusts circuit is connected with the output end of the rectification circuit, the LED luminance tune
The light modulation pin of LED constant current control chip in economize on electricity road receives the brightness pwm control signal of the control module output,
The cathode output end that the LED luminance adjusts circuit is connected with the anode of the LED light source feeder ear, the LED luminance tune
The cathode output end ground connection on economize on electricity road；
The input terminal of the optical coupling isolation circuit receives the colour temperature pwm control signal, light in the optical coupling isolation circuit
The pole C of coupling is connected with the LED colour temperature adjusts circui, and the LED colour temperature adjusts circui includes being connected with the pole C of optocoupler
Switching tube, the switching tube are connected with the cathode of the cathode of the warm white light source feeder ear and the positive white light source feeder ear
It connects, the optical coupling isolation circuit controls leading for switching tube in the LED colour temperature adjusts circui according to the colour temperature pwm control signal
Logical or cut-off, to control the output current ratio of the warm white light source and the positive white light source.
Optionally, the LED colour temperature adjusts circui includes the first output switching tube, the second output switching tube and triode,
The optical coupling isolation circuit includes an optocoupler, is denoted as the first optocoupler, and the pole C of first optocoupler passes through the first output switching tube
It is connected with the cathode of the warm white light source feeder ear, the pole C of first optocoupler passes through institute also after the paraphase of triode
The second output switching tube is stated to be connected with the cathode of the positive white light source feeder ear.
Optionally, the LED colour temperature adjusts circui includes third output switching tube and the 4th output switching tube, the colour temperature
Pwm control signal includes the first colour temperature pwm control signal and the second colour temperature pwm control signal, the optical coupling isolation circuit include
Two optocouplers, respectively the second optocoupler and third optocoupler, the input terminal of second optocoupler receive the first colour temperature PWM control
Signal, the input terminal of the third optocoupler receive the second colour temperature pwm control signal, and the pole C of second optocoupler passes through the
Three output switching tubes are connected with the cathode of the warm white light source feeder ear, and the pole C of the third optocoupler is opened by the 4th output
The cathode of positive white light source feeder ear described in Guan Guanyu is connected.
Optionally, the protection circuit includes: current foldback circuit and surge protection circuit.
Optionally, the pole C of first optocoupler is connected with the pole G of the first output switching tube, the first output switch
The pole D of pipe is connected with the cathode of the warm white light source feeder ear；The pole C of first optocoupler passes through current-limiting resistance and described three
The pole B of pole pipe is connected, and the pole C of the triode is connected with the pole G of the second output switching tube, the second output switching tube
The pole D be connected with the cathode feeder ear of the positive white light source feeder ear, it is described first output switching tube the pole S, described second
The pole S, the pole E of the first optocoupler and the pole E of the triode of output switching tube are all connected with power supply secondary ground.
Optionally, the pole C of second optocoupler is connected with the pole G of third output switching tube, the third output switch
The pole D of pipe is connected with the cathode of the warm white light source feeder ear, the G of the pole C of the third optocoupler and the 4th output switching tube
Pole is connected, and the pole D of the 4th output switching tube is connected with the cathode of the positive white light source feeder ear, the third output
The pole S of switching tube, the 4th output pole S of switching tube, the E of the pole E of second optocoupler and the third optocoupler are extremely equal
Connect power supply secondary ground.
Optionally, the LED colour temperature adjusts circui further includes the first pressure limited protection circuit and the second pressure limited protection circuit, institute
It states first pressure limited protection circuit one end to be connected with the pole S of the first output switching tube or third output switching tube, institute
The other end for stating the first pressure limited protection circuit is extremely connected with the G of the first output switching tube or third output switching tube
It connects, the pole the G phase of one end of second pressure limited protection circuit and the second output switching tube or the 4th output switching tube
Connection, the S of the other end of second pressure limited protection circuit and the second output switching tube or the 4th output switching tube
Pole is connected.
Optionally, first pressure limited protection circuit is constituted by zener diode D2 is in parallel with resistance R6；Second limit
Voltage protection circuit is constituted by zener diode D3 is in parallel with resistance R7.
Optionally, the pole C of first optocoupler also passes through resistance R4 and the LED luminance adjusts the cathode output end of circuit
It is connected, the pole C of the triode also passes through resistance R5 to be connected with the cathode output end that the LED luminance adjusts circuit.
Optionally, the pole C of second optocoupler also passes through resistance R9 and the LED luminance adjusts the cathode output end of circuit
It is connected, the pole C of the third optocoupler also passes through resistance R10 to be connected with the cathode output end that the LED luminance adjusts circuit.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects: this is practical new
Constant-current driving power supply is isolated in the light modulation toning LED that type provides, and control module issues mutually independent pwm control signal, respectively
Brightness pwm control signal and colour temperature pwm control signal, brightness pwm control signal directly control the LED isolation drive electricity of tunable optical
The light modulation pin of LED constant current control chip in road with dimming function carries out LED light source load light modulation, colour temperature PWM control letter
It is just white and warm to adjust by the quick opening and closing of control output switching tube MOS number by the simple peripheral cell such as optocoupler
The lamp bead of white two kinds of colour temperatures exports current ratio, thus achieve the purpose that toning, and in the process LED isolation drive of this color-temperature regulating
The output total current of this luminance state of constant-current supply is constant, this makes LED light source load lamp pearly-lustre decline slowly, and driving power load is simultaneous
Capacitive is strong.In addition, the primary of driving power is arranged in the control module for generating pwm control signal, this makes driving power power consumption
It is very low, meet energy-efficient requirement.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is that constant-current driving power supply electrical block diagram is isolated in the utility model first embodiment light modulation toning LED；
Fig. 2 is that constant-current driving power supply electrical block diagram is isolated in the utility model second embodiment light modulation toning LED.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
The purpose of the utility model is to provide a kind of light modulation toning LED, and constant-current driving power supply is isolated, and has load compatibility
By force, the advantage that lamp bead light decay is slow and low energy consumption.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
As shown in Figure 1 and Figure 2, light modulation toning LED isolation constant-current driving power supply provided by the utility model includes: protection electricity
Road 1, EMI filter circuit 2, rectification circuit 3, voltage regulator circuit 4, optical coupling isolation circuit 7, control module 6, LED light source feeder ear,
LED colour temperature adjusts circui 8 and LED luminance adjust circuit 5, the output end of the protection circuit 1 and the EMI filter circuit 2
Input terminal is connected, and the output end of the EMI filter circuit 2 is connected with the input terminal of the rectification circuit 3, exchanges city L, N
Electricity is successively after the protection circuit 1, EMI filter circuit 2 and rectification circuit 3, to give the power supply of non-isolated constant pressure accessory power supply
Voltage regulator circuit 4 and LED luminance adjust circuit 5 and provide bus high direct voltage；LED luminance, which is adjusted, uses isolating transformer in circuit 5
Realization is isolated with LED load end, and protection circuit is overcurrent, surge protection circuit.
Non-isolated constant pressure accessory power supply power supply voltage regulator circuit 4, the general control chip with constant voltage output characteristic.Only need
Bus high direct voltage after rectification is reduced to low-voltage direct by few peripheral assembly, steady using three-terminal regulator chip
It presses to the subsequent control module power supply for generating pwm control signal.Voltage regulator circuit 4 is connected with the output end of the rectification circuit 3
It connects, the voltage that the voltage regulator circuit 4 exports the rectification circuit 3 is depressured, and the stabilization of maintenance voltage signal.
The control module 6 of pwm control signal is generated, it is general that there is the MCU mould group for exporting two or more pwm signals.?
In the utility model, the control module of pwm control signal is generated, a brightness control pwm signal is exported, is adjusted to LED luminance
Circuit.In addition it also exports a colour temperature and controls pwm signal, mix colours to two switching tube MOS of secondary LED colour temperature adjusts circui,
It is denoted as brightness pwm control signal and colour temperature pwm control signal respectively.By adjusting the duty ratio of brightness pwm control signal, control
The brightness of LED load controls the variation of LED load colour temperature by adjusting the duty ratio of colour temperature pwm control signal.Control module 6
It can be WIFI module, bluetooth mould group, infrared receiver and transmitting IR mould group, pyroelectric human body red line sensor, microwave module
Etc. formulas control output pwm signal mould group.
The LED light source feeder ear includes warm white light source feeder ear and positive white light source feeder ear；
The input terminal that the LED luminance adjusts circuit 5 is connected with the output end of the rectification circuit 3, the LED luminance
The light modulation pin for adjusting the LED constant current control chip in circuit 5 receives the brightness PWM control that the control module 6 exports
Signal, the cathode output end that the LED luminance adjusts circuit 5 are connected with the anode of the LED light source feeder ear, the LED
The cathode output end of brightness regulating circuit 5 is grounded, the LED luminance pwm control signal duty exported by adjusting control module 6
Than that can directly control LED light source and carry out load light modulation, to realize the purpose for adjusting brightness.
Embodiment one
As shown in Figure 1, the input terminal of optical coupling isolation circuit 7 receives the colour temperature pwm control signal, optical coupling isolation circuit 7
Including an optocoupler, it is denoted as the first optocoupler, colour temperature pwm control signal is transferred to by current-limiting resistance R4, the first optocoupler U1 isolation
The secondary (being extremely connected with the G of R5, switching tube Q1) of the LED isolated drive circuit of tunable optical, the pole C of the first optocoupler and the LED
Colour temperature adjusts circui 8 is connected, and LED colour temperature adjusts circui 8 includes the first output switching tube Q1, the second output switching tube Q3 and three
The pole C of pole pipe Q2, the first optocoupler are connected by the first output switching tube Q1 with the cathode of warm white light source feeder ear, the first optocoupler
The pole C also after the paraphase of triode Q2, be connected by the second output switching tube Q3 with the cathode of positive white light source feeder ear.
The pole C of first optocoupler is connected with the pole G of the first output switching tube, the pole D of the first output switching tube Q1 and warm white
The cathode feeder ear of light source is connected；The pole C of first optocoupler also passes through current-limiting resistance R5 and is connected with the pole B of triode Q2, and three
The pole C of pole pipe Q2 is connected with the pole G of the second output switching tube Q3, the second pole D of output switching tube Q3 and bearing for positive white light source
Pole feeder ear is connected；LED colour temperature adjusts circui 7 further includes the first pressure limited protection circuit and the second pressure limited protection circuit, and first
Pressure limited protection circuit one end with first output switching tube Q1 the pole S be connected, the other end of the first pressure limited protection circuit with it is described
The pole G of first output switching tube Q1 is connected, and one end of the second pressure limited protection circuit is extremely connected with the G of the second output switching tube Q3
It connects, the other end of the second pressure limited protection circuit is connected with the pole S of the second output switching tube Q3；First pressure limited protection circuit is by steady
Press diode D2 is in parallel with resistance R6 to constitute；Second pressure limited protection circuit is constituted by zener diode D3 is in parallel with resistance R7；The
The pole S of one output switching tube Q1 and the pole S of the second output switching tube Q3 are all connected with power supply secondary ground；The pole C of first optocoupler is also logical
It crosses resistance R2 to be connected with the anode of the LED light source feeder ear, the pole C of triode Q2 also passes through resistance R3 and the LED light
The cathode output end of source feeder ear is connected.
Since colour temperature pwm control signal is after the paraphase of triode Q2, the conducting of control output switching tube Q3 is closed,
So output switching tube Q1 is that reverse phase is connected, closes with switching tube Q3 is exported.That is output switching tube Q1 conducting, exports switching tube Q3
It closes, vice versa.
First output switching tube Q1, which is opened, to be connected by R4, R6 and the positive of LED light source feeder ear, and D2 plays voltage-limiting protections
Effect.Second output switching tube Q3, which is opened, to be connected by R5, R7 and the positive of LED light source feeder ear, and D3 plays voltage-limiting protections and makees
With.
When generating the second control pwm signal high level of the control module output of pwm control signal, by optocoupler U1
It is transferred to U1C extremely low level, that is, the extremely low level of Q1G, Q1 cut-off.The pole R8, Q2B for connecting the pole U1C is also low level, Q2
Cut-off.Second output switching tube Q3, which is opened, divides the end LED+ voltage turn-on by R5, R7.
When second control pwm signal of the control module output of generation pwm control signal is low level, by optocoupler U1
It is transferred to U1C extremely high level, that is, the high level of Q1G, output switching tube Q1 is opened divides the end LED+ voltage to lead by R4, R6
It is logical.The pole R8, Q2B of the connection pole U1C is also high level, Q2 conducting.The extremely low level of namely Q3G, Q3 cut-off.
Since in this way, the second primary control pwm signal of control driving power can be controlled after light-coupled isolation is transmitted
System exports opening and closing for two metal-oxide-semiconductors, to realize the purpose for adjusting colour temperature.
Power supply output connection LED light source load circuit, LED light source load by just white and two kinds of colour temperatures of warm white lamp bead (
By double-colored lamp bead) it forms, the anode of the LED lamp bead of anode two kinds of colour temperatures of connection of LED light source feeder ear, the cathode of warm white light source
The cathode feeder ear of feeder ear and positive white light source is separately connected the cathode of the LED lamp bead of two kinds of colour temperatures.
Embodiment two
As shown in Fig. 2, LED colour temperature adjusts circui includes the third output switching tube Q5 of output switching tube Q4 and the 4th, colour temperature
Pwm control signal includes the first colour temperature pwm control signal and the second colour temperature pwm control signal, and optical coupling isolation circuit includes two
Optocoupler, respectively the second optocoupler U2 and third optocoupler U3, the input terminal of the second optocoupler receive the first colour temperature pwm control signal, the
The input terminal of three optocouplers receives the second colour temperature pwm control signal, and the pole C of the second optocoupler exports switching tube and warm white by third
The cathode of source feeder ear is connected, the cathode phase that the pole C of third optocoupler passes through the 4th output switching tube and positive white light source feeder ear
Connection.
The pole C of second optocoupler is connected with the pole G of third output switching tube, and third exports the pole D and the warm white of switching tube
The cathode of source feeder ear is connected, and the pole C of third optocoupler is connected with the pole G of the 4th output switching tube, the 4th output switching tube
The pole D be connected with the cathode of positive white light source feeder ear, third exports the pole S of switching tube, the pole S of the 4th output switching tube, the
The pole E of two optocouplers and the pole E of third optocoupler are all connected with power supply secondary ground.The pole C of second optocoupler also pass through resistance R9 with it is described
The cathode output end that LED luminance adjusts circuit is connected, and the pole C of the third optocoupler also passes through resistance R10 and the LED luminance
The cathode output end for adjusting circuit is connected.
LED colour temperature adjusts circui further includes the first pressure limited protection circuit and the second pressure limited protection circuit, the first voltage-limiting protection
Circuit on one side is connected with the pole S of third output switching tube, and the other end and third of the first pressure limited protection circuit export switching tube
The pole G be connected, one end of the second pressure limited protection circuit with the 4th output switching tube the pole G be connected, the second voltage-limiting protection electricity
The other end on road is connected with the pole S of the 4th output switching tube.First pressure limited protection circuit is by zener diode D2 and resistance R6
Parallel connection is constituted；Second pressure limited protection circuit is constituted by zener diode D3 is in parallel with resistance R7.
The program by the first colour temperature pwm control signal and the second colour temperature pwm control signal respectively to warm white light source and just
The current ratio of white light source is adjusted, to achieve the purpose that toning.
Light modulation toning LED isolation constant current driving constant-current power provided by the utility model has the advantage that
The LED isolation drive constant-current supply 1. the light modulation of the utility model is mixed colours, by the control mould for generating pwm control signal
The brightness pwm control signal of block output directly controls the LED constant current that LED luminance is adjusted in circuit with dimming function and controls chip
Light modulation pin, carry out LED light source load light modulation.
Colour temperature pwm control signal by generating the control module output of pwm control signal passes through the letters such as optocoupler, triode
Single peripheral cell is converted into the pwm control signal of two complete reverse phases, quick unlatching and pass by control output switching tube MOS
It closes, current ratio is exported to adjust the lamp bead of just white and two kinds of colour temperatures of warm white, to achieve the purpose that toning.And in this color-temperature regulating
The current luminance state of process LED isolation drive constant-current supply output total current it is constant.
Above-mentioned analysis is it is found that constant current driving constant-current power is isolated in the light modulation toning LED of the utility model, in any light modulation
In the process, constant current state is always worked in, does not have the presence of " pressure constant state ", the design of such route, to LED light source load
The shortcomings that compatible strong, lamp bead light decay is slow, overcomes tradition light modulation toning constant pressure and flow LED drive power.
2. because generating the control module design of pwm control signal in the primary of driving power, such as non-isolated constant pressure auxiliary
Power circuit uses the control chip of the constant voltage output of six grades of energy consumptions, and the stand-by power consumption of driving power is easily met Energy Star
It is required that.
3. other opposite light modulation toning LED drive power schemes, route is simple, high reliablity and at low cost.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Explanation be merely used to help understand the method and its core concept of the utility model；Meanwhile for the general technology of this field
Personnel, based on the idea of the present invention, there will be changes in the specific implementation manner and application range.In conclusion
The content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. constant-current driving power supply is isolated in a kind of light modulation toning LED, which is characterized in that the power supply includes: protection circuit, EMI filter
Wave circuit, rectification circuit, voltage regulator circuit, optical coupling isolation circuit, control module, LED light source feeder ear, LED colour temperature adjusts circui
Circuit is adjusted with LED luminance, the output end of the protection circuit is connected with the input terminal of the EMI filter circuit, the EMI
The output end of filter circuit is connected with the input terminal of the rectification circuit, and electric main successively passes through the protection circuit, EMI
After filter circuit and rectification circuit, adjusts circuit for the voltage regulator circuit and LED luminance and bus high direct voltage is provided；
The LED light source feeder ear includes warm white light source feeder ear and positive white light source feeder ear；
The voltage regulator circuit is connected with the output end of the rectification circuit, and the voltage regulator circuit exports the rectification circuit
Voltage is depressured, and the stabilization of maintenance voltage signal；
The control module generates control LED luminance all the way and adjusts the pwm control signal of circuit and control LED color temperature adjustment all the way
The pwm control signal of circuit is denoted as brightness pwm control signal and colour temperature pwm control signal respectively；
The input terminal that the LED luminance adjusts circuit is connected with the output end of the rectification circuit, and the LED luminance adjusts electricity
The light modulation pin of LED constant current control chip in road receives the brightness pwm control signal of the control module output, described
The cathode output end that LED luminance adjusts circuit is connected with the anode of the LED light source feeder ear, and the LED luminance adjusts electricity
The cathode output end on road is grounded；
The input terminal of the optical coupling isolation circuit receives the colour temperature pwm control signal, the C of optocoupler in the optical coupling isolation circuit
Pole is connected with the LED colour temperature adjusts circui, and the LED colour temperature adjusts circui includes the switch being connected with the pole C of optocoupler
Pipe, the switching tube are connected with the cathode of the cathode of the warm white light source feeder ear and the positive white light source feeder ear, institute
State optical coupling isolation circuit according to the colour temperature pwm control signal control in the LED colour temperature adjusts circui conducting of switching tube or
Cut-off, to control the output current ratio of the warm white light source and the positive white light source.
2. constant-current driving power supply is isolated in light modulation toning LED according to claim 1, which is characterized in that the LED colour temperature tune
Economize on electricity road includes the first output switching tube, the second output switching tube and triode, and the optical coupling isolation circuit includes an optocoupler,
It is denoted as the first optocoupler, the cathode phase that the pole C of first optocoupler passes through the first output switching tube and the warm white light source feeder ear
Connection, the pole C of first optocoupler pass through the second output switching tube and the positive white light also after the paraphase of triode
The cathode of source feeder ear is connected.
3. constant-current driving power supply is isolated in light modulation toning LED according to claim 1, which is characterized in that the LED colour temperature tune
Economize on electricity road includes third output switching tube and the 4th output switching tube, and the colour temperature pwm control signal is controlled including the first colour temperature PWM
Signal processed and the second colour temperature pwm control signal, the optical coupling isolation circuit include two optocouplers, respectively the second optocoupler and third
Optocoupler, the input terminal of second optocoupler receive the first colour temperature pwm control signal, and the input terminal of the third optocoupler receives
The pole C of the second colour temperature pwm control signal, second optocoupler exports switching tube and the warm white light source power supply by third
The cathode at end is connected, the cathode that the pole C of the third optocoupler passes through the 4th output switching tube and the positive white light source feeder ear
It is connected.
4. constant-current driving power supply is isolated in light modulation toning LED according to claim 1, which is characterized in that the protection circuit
It include: current foldback circuit and surge protection circuit.
5. constant-current driving power supply is isolated in light modulation toning LED according to claim 2, which is characterized in that first optocoupler
The pole C with first output switching tube the pole G be connected, it is described first output switching tube the pole D and the warm white light source feeder ear
Cathode be connected；The pole C of first optocoupler is connected by current-limiting resistance with the pole B of the triode, the triode
The pole C with second output switching tube the pole G be connected, it is described second output switching tube the pole D and the positive white light source feeder ear
Cathode feeder ear be connected, the pole S of the first output switching tube, second output pole S of switching tube, the first optocoupler
The pole E and the pole E of the triode are all connected with power supply secondary ground.
6. constant-current driving power supply is isolated in light modulation toning LED according to claim 3, which is characterized in that second optocoupler
The pole G of the pole C and third output switching tube be connected, the pole D of the third output switching tube and the warm white light source feeder ear
Cathode be connected, the pole C of the third optocoupler with the 4th output switching tube the pole G be connected, it is described 4th output switching tube
The pole D be connected with the cathode of the positive white light source feeder ear, the pole S of third output switching tube, the 4th output are opened
The pole S, the pole E of second optocoupler and the pole E of the third optocoupler for closing pipe are all connected with power supply secondary ground.
7. constant-current driving power supply is isolated in light modulation toning LED according to claim 2, which is characterized in that the LED colour temperature tune
Economize on electricity road further includes the first pressure limited protection circuit and the second pressure limited protection circuit, first pressure limited protection circuit one end with it is described
The pole S of first output switching tube is connected, the G of the other end of first pressure limited protection circuit and the first output switching tube
Pole is connected, and one end of second pressure limited protection circuit is connected with the pole G of the second output switching tube, second limit
The other end of voltage protection circuit is connected with the pole S of the second output switching tube.
8. constant-current driving power supply is isolated in light modulation toning LED according to claim 7, which is characterized in that first pressure limiting
Protect electricity routing zener D2 is in parallel with resistance R6 to constitute；Second pressure limited protection circuit is by zener diode D3 and electricity
R7 parallel connection is hindered to constitute.
9. constant-current driving power supply is isolated in light modulation toning LED according to claim 2, which is characterized in that first optocoupler
The pole C also pass through resistance R4 and the LED luminance and adjust the cathode output end of circuit and be connected, the pole C of the triode is also logical
It crosses resistance R5 and is connected with the cathode output end that the LED luminance adjusts circuit.
10. constant-current driving power supply is isolated in light modulation toning LED according to claim 3, which is characterized in that second optocoupler
The pole C also pass through resistance R9 and the LED luminance and adjust the cathode output end of circuit and be connected, the pole C of the third optocoupler is also
It is connected by resistance R10 with the cathode output end that the LED luminance adjusts circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821329050.4U CN209017343U (en) | 2018-08-17 | 2018-08-17 | A kind of light modulation toning LED isolation constant-current driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821329050.4U CN209017343U (en) | 2018-08-17 | 2018-08-17 | A kind of light modulation toning LED isolation constant-current driving power supply |
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| CN209017343U true CN209017343U (en) | 2019-06-21 |
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| CN201821329050.4U Withdrawn - After Issue CN209017343U (en) | 2018-08-17 | 2018-08-17 | A kind of light modulation toning LED isolation constant-current driving power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108770136A (en) * | 2018-08-17 | 2018-11-06 | 东莞邦达五金有限公司 | A kind of light modulation toning LED isolation constant-current driving power supplies |
| CN110949238A (en) * | 2019-12-11 | 2020-04-03 | 杨敏锋 | Lamp source color control device and car lamp system |
| CN114401570A (en) * | 2022-03-25 | 2022-04-26 | 南昌大学 | Visible light communication drive circuit |
-
2018
- 2018-08-17 CN CN201821329050.4U patent/CN209017343U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108770136A (en) * | 2018-08-17 | 2018-11-06 | 东莞邦达五金有限公司 | A kind of light modulation toning LED isolation constant-current driving power supplies |
| CN108770136B (en) * | 2018-08-17 | 2024-01-05 | 东莞邦达五金有限公司 | Dimming and toning LED isolation constant-current driving power supply |
| CN110949238A (en) * | 2019-12-11 | 2020-04-03 | 杨敏锋 | Lamp source color control device and car lamp system |
| CN114401570A (en) * | 2022-03-25 | 2022-04-26 | 南昌大学 | Visible light communication drive circuit |
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