CN106507547A - A kind of LED dimming control systems - Google Patents
A kind of LED dimming control systems Download PDFInfo
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- CN106507547A CN106507547A CN201611222904.4A CN201611222904A CN106507547A CN 106507547 A CN106507547 A CN 106507547A CN 201611222904 A CN201611222904 A CN 201611222904A CN 106507547 A CN106507547 A CN 106507547A
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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
The invention discloses a kind of LED dimming control systems, MCU units, current sampling circuit, voltage sampling circuit, temperature sampling circuit, current loop circuit, voltage loop circuit, PWM sample circuits and monobus communicating circuit, wherein described current sampling circuit, the voltage sampling circuit, the temperature sampling circuit, the current loop circuit, the voltage loop circuit, the PWM sample circuits are connected with the MCU units respectively, and the monobus communicating circuit is connected with the PWM sample circuits by controlling bus.The present invention is controlled LED power using single-chip microcomputer, powerful control function and real-time monitoring and control can be had based on this MCU for developing, so as to reaching the electric current of control LED power output and limiting the effect of maximum load voltage, five in one controlling bus collect AD0 10V light modulation serial communications again and control PWM duty cycle for all over the body, there is the dimming function of invariable power and constant current simultaneously, simple and convenient.
Description
Technical field
The present invention relates to LED control fields, particularly relate to a kind of LED dimming control systems.
Background technology
On market, most of LED power is mainly adjusted to light source by hardware chip logic and is protected, portable
Property poor, single function, once need change or upgrading New function often waste time and energy.In addition on market customer requirement light modulation
Mode is multifarious, develops the powerful MCU of a strong control function of compatibility imperative.
Therefore, the present inventor needs a kind of new technology of design badly to improve its problem.
Content of the invention
The present invention is intended to provide a kind of LED dimming control systems, which can control the electric current of LED power output and restriction
Maximum load voltage, while five in one controlling bus collect AD0-10V light modulation serial communications again controls PWM duty cycle for the whole body, with
When there is the dimming function of invariable power and constant current, simple and convenient, most of light modulation demand on compatible market.
For solving above-mentioned technical problem, the technical scheme is that：
A kind of LED dimming control systems, including：MCU units, current sampling circuit, voltage sampling circuit, temperature sampling electricity
Road, current loop circuit, voltage loop circuit, PWM sample circuits and monobus communicating circuit, wherein described current sampling circuit, institute
State voltage sampling circuit, the temperature sampling circuit, the current loop circuit, the voltage loop circuit, the PWM sample circuits
It is connected with the MCU units respectively, the monobus communicating circuit is connected with the PWM sample circuits by controlling bus.
Preferably, the current loop circuit include operational amplifier U3B, resistance R1, resistance R2, resistance R11, electric capacity C2,
Electric capacity C8, diode D1, resistance R1 one end are connected with the 15th pin of MCU units, and the other end is connected and be followed by with resistance R2, electric capacity C2
Ground；Resistance R11 and electric capacity C8 are connected between the 6th pin of operational amplifier U3B and the 7th pin；The voltage loop circuit includes transporting
Amplifier U3A, resistance R20, resistance R23, electric capacity C13, diode D3 is calculated, resistance R20 one end is connected with the 17th pin of MCU units
Connect, the other end is connected with the 3rd pin of operational amplifier U3A；Resistance R23 and electric capacity C13 are connected on the 2nd of operational amplifier U3A
Between pin and the 1st pin；7th pin of operational amplifier U3B pass sequentially through after diode D1, diode D3 with operational amplifier U3A
The 1st pin connection.
Preferably, the current sampling circuit includes operational amplifier U5, resistance R28, resistance R35, electric capacity C21, electric capacity
C18, resistance R35 and electric capacity C21 are connected in parallel between the 3rd pin of operational amplifier U5 and the 4th pin；Resistance R28 is put with computing one end
The 4th pin connection of big device U5, the other end are connected with the 9th pin and electric capacity C18 of MCU units；
Preferably, the voltage sampling circuit includes resistance R8, resistance R12, resistance R15, electric capacity C10, resistance R8, resistance
It is grounded after R12, resistance R15 series connection；Electric capacity C10 is connected in parallel on resistance R15 two ends, and its one end is connected with the 8th pin of MCU units, separately
One end is grounded.
Preferably, the temperature sampling circuit includes that resistance R16, variable resistor RT1, electric capacity C11, resistance R16 one end are situated between
Enter 5V power supplys；The other end is connected with the 13rd pin of variable resistor RT1 and MCU unit, after variable resistor RT1 and electric capacity C11 parallel connections
Ground connection.
Preferably, the PWM sample circuits include operational amplifier U6, resistance R29, resistance R32, resistance R50, electric capacity
C19, electric capacity C191, the 4th pin of operational amplifier U6 are connected with the 14th pin of MCU units after resistance R32；Resistance R50 and
Electric capacity C191 is in parallel, and the two one end is connected with the 14th pin of MCU units, and the other end is grounded；The 1st pin difference of operational amplifier U6
It is connected with resistance R29 and electric capacity C19, its 3rd pin is connected with the 4th pin；Resistance R29 is connected with controlling bus.
Preferably, the monobus communicating circuit include optically isolated chip U7, optically isolated chip U8, optically isolated chip U9,
Optically isolated chip U10, Zener diode ZD1, Zener diode ZD2, resistance R42, resistance R46, wherein optically isolated chip U7 according to
Secondary it is connected with the 2nd pin of optically isolated chip U8 and optically isolated chip U10 after Zener diode ZD1, resistance R42；Optically isolated
Chip U9 is passed sequentially through
Connect.
Preferably, also include pre- debugging serial port circuit, which includes that resistance R18 and connector UART1, resistance R18 mono- are terminated
Enter 5V voltages, the other end is connected with the 12nd pin of the 2nd pin and MCU units of connector UART1, the 3rd pin of connector UART1 and
The 10th pin connection of MCU units.
Preferably, operational amplifier U3A, operational amplifier U3B adopt AP4310 operational amplifiers.
Preferably, optically isolated chip U7, optically isolated chip U8, optically isolated chip U9, optically isolated chip U10 are
The optically isolated chips of PC357SMD.
Using above-mentioned technical proposal, the present invention at least includes following beneficial effect：
LED dimming control systems of the present invention, are controlled LED power using single-chip microcomputer, the MCU developed based on this
Can there are powerful control function and real-time monitoring and control, so as to reaching the electric current of control LED power output and limiting maximum
The effect of load voltage, five in one controlling bus collect AD0-10V light modulation serial communications again and control PWM duty cycle for the whole body, while
There is the dimming function of invariable power and constant current, simple and convenient, most of light modulation demand on both compatible market is not again excessive
Lead allow using become complexity.
Description of the drawings
Fig. 1 is the partial circuit diagram of LED dimming control systems of the present invention；
Fig. 2 is the circuit diagram of current loop circuit of the present invention and voltage loop circuit；
Fig. 3 is the circuit diagram of current sampling circuit of the present invention；
Fig. 4 is the circuit diagram of temperature sampling circuit of the present invention；
Fig. 5 is the circuit diagram of PWM sample circuits of the present invention；
Fig. 6 is the circuit diagram of monobus communicating circuit of the present invention；
Fig. 7 is the circuit diagram of pre- debugging serial port circuit of the present invention；
Fig. 8 is the work block diagram of LED dimming control systems of the present invention.
Specific embodiment
Accompanying drawing in below in conjunction with the embodiment of the present invention, to the embodiment of the present invention in technical scheme carry out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiment.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in Figures 1 to 7, for meeting a kind of LED dimming control systems of the present invention, including：MCU units, electric current are adopted
Sample circuit, voltage sampling circuit, temperature sampling circuit, current loop circuit, voltage loop circuit, PWM sample circuits and monobus lead to
News circuit, wherein described current sampling circuit, the voltage sampling circuit, the temperature sampling circuit, the current loop circuit,
The voltage loop circuit, the PWM sample circuits are connected with the MCU units respectively, and the monobus communicating circuit passes through one
Controlling bus are connected with the PWM sample circuits.
Preferably, as shown in Fig. 2 the current loop circuit includes operational amplifier U3B, resistance R1, resistance R2, resistance
R11, electric capacity C2, electric capacity C8, diode D1, resistance R1 one end are connected with the 15th pin of MCU units, the other end and resistance R2, electricity
It is grounded after holding C2 series connection；Resistance R11 and electric capacity C8 are connected between the 6th pin of operational amplifier U3B and the 7th pin；The voltage
Loop circuit includes operational amplifier U3A, resistance R20, resistance R23, electric capacity C13, diode D3, resistance R20 one end and MCU units
The connection of the 17th pin, the other end is connected with the 3rd pin of operational amplifier U3A；Resistance R23 and electric capacity C13 are connected on operation amplifier
Between 2nd pin of device U3A and the 1st pin；7th pin of operational amplifier U3B pass sequentially through after diode D1, diode D3 with computing
The 1st pin connection of amplifier U3A.
Preferably, as shown in figure 3, the current sampling circuit includes operational amplifier U5, resistance R28, resistance R35, electricity
Hold C21, electric capacity C18, resistance R35 and electric capacity C21 to be connected in parallel between the 3rd pin of operational amplifier U5 and the 4th pin；Resistance R28 mono-
End is connected with the 4th pin of operational amplifier U5, and the other end is connected with the 9th pin and electric capacity C18 of MCU units.
Preferably, as shown in figure 1, the voltage sampling circuit includes resistance R8, resistance R12, resistance R15, electric capacity C10,
Resistance R8, resistance R12, resistance R15 are grounded after connecting；Electric capacity C10 is connected in parallel on resistance R15 two ends, and the of its one end and MCU units
8 pin connect, and the other end is grounded.
Preferably, as shown in figure 4, the temperature sampling circuit includes resistance R16, variable resistor RT1, electric capacity C11, resistance
Intervene 5V power supplys in R16 one end；The other end is connected with the 13rd pin of variable resistor RT1 and MCU unit, variable resistor RT1 and electric capacity
It is grounded after C11 parallel connections.
Preferably, as shown in figure 5, the PWM sample circuits include operational amplifier U6, resistance R29, resistance R32, resistance
R50, electric capacity C19, electric capacity C191, the 4th pin of operational amplifier U6 are connected with the 14th pin of MCU units after resistance R32；Electricity
Resistance R50 and electric capacity C191 is in parallel, and the two one end is connected with the 14th pin of MCU units, and the other end is grounded；The of operational amplifier U6
1 pin is connected with resistance R29 and electric capacity C19 respectively, and its 3rd pin is connected with the 4th pin；Resistance R29 is connected with controlling bus.
Preferably, as shown in fig. 6, the monobus communicating circuit include optically isolated chip U7, optically isolated chip U8, light every
Off-chip piece U9, optically isolated chip U10, Zener diode ZD1, Zener diode ZD2, resistance R42, resistance R46, wherein optically isolated
Chip U7 is passed sequentially through
Connect；Optically isolated chip U9 is passed sequentially through after Zener diode ZD2, resistance R46 with optically isolated chip U8's and optically isolated chip U10
2nd pin connects.
Preferably, as shown in fig. 7, also including pre- debugging serial port circuit, which includes resistance R18 and connector UART1, resistance
5V voltages are accessed in R18 one end, and the other end is connected with the 12nd pin of the 2nd pin and MCU units of connector UART1, connector UART1
The 3rd pin and MCU units the 10th pin connection.
Preferably, operational amplifier U3A, operational amplifier U3B adopt AP4310 operational amplifiers.
Preferably, optically isolated chip U7, optically isolated chip U8, optically isolated chip U9, optically isolated chip U10 are
The optically isolated chips of PC357SMD.
Preferably, also power supply circuits are included, which is connected with the MCU units.In the present embodiment, the power supply circuits are one
5V power supply circuits, physical circuit is referring to removing MCU units in Fig. 1 and other circuit structures outside voltage sampling circuit part.By
Can clearly characterize in Fig. 1, this time not repeat.
Preferably, operational amplifier U5, operational amplifier U6 adopt LM321 operational amplifiers.
Preferably, the MCU units are PIC16F1508 single-chip microcomputers.
The operation principle of the present embodiment is：As shown in figure 8, the two-way PWM waveform produced after single-chip microprocessor MCU cell processing
Difference driving voltage loop circuit and current loop circuit, voltage loop circuit control maximum voltage are reached the standard grade, current loop circuit adjustment output
Current value, is simultaneously used for voltage detecting and current detecting, by real-time detection and calculates power, reaches the effect of invariable power.
Power-fail memory function state is reached using FLASH memory functions and the function of timing parameters is set.Monobus simultaneously compatibility PWM, 0
10V, the transmitting-receiving of serial communication are made up of two 485 symmetrical structures, and both sides can receive the number of any one party transmission simultaneously
According to.Selection pattern can use same single line to carry out AD detections after opening, so as to carry out 0 10V light modulations.
The present embodiment is elaborated with reference to software section.
First, current detection section
The voltage parameter for being come by detection voltage sample circuit partial pressure carries out ten A/D values, carries out average computation
Obtain the actual value of corresponding voltage.
Program part can design as follows：
2nd, temperature detection
By the calculating of the curve of thermistor, A/D inspections after the resistance partial pressure of thermistor when substantially drawing power work
Temperature numerical is measured out, host computer interface is fed back to by serial ports, and is allowed in particular value voltage to carry out self-protection.
3rd, current detecting
Calculated with the similar mode of detection voltage, but be because that current curve is not up to standard so strong using segmentation
Positive method is more nearly actual value making current value.
Program part can design as follows：
4th, constant current and constant power mode：
The electric current output parameter of corresponding ratio, such as PWM duties are adjusted by the PWM duty cycle of modification control voltage ring
Than 80%, so electric current output is exactly 80%.
Program part can design as follows：3
MODE=0；
EB_STATUS [5]=0X00；
POWER_SET=RECDATA [6]；
PWMT4=RECDATA [6] * 533；
PWMT4=PWMT4/100；
Constant power mode is then that the electric current and voltage value by obtaining before carries out calculating at present power in real time
Value is compared calculatings with the performance number for setting again, adjusts PWM duty cycle controlled output current value and is balanced with load voltage
It is corrected to setting power.
Simultaneously small range fluctuation is carried out in order to prevent from reaching power after set value, the machine is designed as detecting which fluctuates and to which
Locked, reached the high invariable power state of precision.
5th, Voltage Cortrol：
The setting of maximum voltage when predominantly LED is unloaded, adjusts Voltage loop feedback by the PWM duty cycle for exporting, reaches
The effect that maximum can be arranged.
6th, communication and timing：
All parameters of arrangement above all can be stored in flash by single-chip microcomputer and be preserved, even if power-off can also be accomplished
The be adjusted to numerical value of last and pattern.
Timing mode is also based on this and designs；For example：
It is then the communication for carrying out upper and lower computer or hander using microcontroller serial port and unibus structure to communicate, and circuit is detailed
See Fig. 6 parts.
7th, 1-10V and PWM light-modulating modes：
Mainly current voltage dimmer voltage is sampled by A/D sample circuits, so as to control electric current ring PWM duties
Than adjusting electric current, and PWM is then capacitor filtering used in sample circuit that its dutycycle is changed into after stable voltage value
Carry out sampling comparison and reach same effect.
Program part can design as follows：
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Multiple modifications of these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (10)
1. a kind of LED dimming control systems, it is characterised in that include：MCU units, current sampling circuit, voltage sampling circuit,
Temperature sampling circuit, current loop circuit, voltage loop circuit, PWM sample circuits and monobus communicating circuit, wherein described electric current are adopted
Sample circuit, the voltage sampling circuit, the temperature sampling circuit, the current loop circuit, the voltage loop circuit, described
PWM sample circuits are connected with the MCU units respectively, and the monobus communicating circuit is adopted with the PWM by controlling bus
Sample circuit connects.
2. LED dimming control systems as claimed in claim 1, it is characterised in that：The current loop circuit includes operation amplifier
Device U3B, resistance R1, resistance R2, resistance R11, electric capacity C2, electric capacity C8, diode D1, resistance R1 one end and the 15th of MCU units
Pin connects, and the other end is grounded after being connected with resistance R2, electric capacity C2；Resistance R11 and electric capacity C8 are connected on the of operational amplifier U3B
Between 6 pin and the 7th pin；The voltage loop circuit includes operational amplifier U3A, resistance R20, resistance R23, electric capacity C13, diode
D3, resistance R20 one end is connected with the 17th pin of MCU units, and the other end is connected with the 3rd pin of operational amplifier U3A；Resistance R23
And electric capacity C13 is connected between the 2nd pin of operational amplifier U3A and the 1st pin；7th pin of operational amplifier U3B passes sequentially through two
It is connected with the 1st pin of operational amplifier U3A after pole pipe D1, diode D3.
3. LED dimming control systems as claimed in claim 1 or 2, it is characterised in that：The current sampling circuit includes computing
Amplifier U5, resistance R28, resistance R35, electric capacity C21, electric capacity C18, resistance R35 and electric capacity C21 are connected in parallel on operational amplifier U5's
Between 3rd pin and the 4th pin；Resistance R28 one end is connected with the 4th pin of operational amplifier U5, the 9th pin of the other end and MCU units
Connect with electric capacity C18.
4. LED dimming control systems as described in claim 1-3 is arbitrary, it is characterised in that：The voltage sampling circuit includes
Resistance R8, resistance R12, resistance R15, electric capacity C10, resistance R8, resistance R12, resistance R15 are grounded after connecting；Electric capacity C10 is connected in parallel on
Resistance R15 two ends, its one end are connected with the 8th pin of MCU units, and the other end is grounded.
5. LED dimming control systems as described in claim 1-4 is arbitrary, it is characterised in that：The temperature sampling circuit includes
Resistance R16, variable resistor RT1, electric capacity C11, resistance R16 one end intervene 5V power supplys；The other end is mono- with variable resistor RT1 and MCU
The 13rd pin connection of unit, is grounded after variable resistor RT1 and electric capacity C11 parallel connections.
6. LED dimming control systems as described in claim 1-5 is arbitrary, it is characterised in that：The PWM sample circuits include transporting
Amplifier U6, resistance R29, resistance R32, resistance R50, electric capacity C19, electric capacity C191 is calculated, the 4th pin of operational amplifier U6 is by electricity
It is connected with the 14th pin of MCU units after resistance R32；Resistance R50 and electric capacity C191 is in parallel, the 14th pin of the two one end and MCU units
Connection, the other end are grounded；1st pin of operational amplifier U6 is connected with resistance R29 and electric capacity C19 respectively, its 3rd pin and the 4th pin
Connection；Resistance R29 is connected with controlling bus.
7. LED dimming control systems as described in claim 1-6 is arbitrary, it is characterised in that：The monobus communicating circuit bag
Include optically isolated chip U7, optically isolated chip U8, optically isolated chip U9, optically isolated chip U10, Zener diode ZD1, two pole of voltage stabilizing
Pipe ZD2, resistance R42, resistance R46, wherein optically isolated chip U7 pass sequentially through after Zener diode ZD1, resistance R42 with optically isolated
The 2nd pin connection of chip U8 and optically isolated chip U10；After optically isolated chip U9 passes sequentially through Zener diode ZD2, resistance R46
It is connected with the 2nd pin of optically isolated chip U8 and optically isolated chip U10.
8. LED dimming control systems as described in claim 1-7 is arbitrary, it is characterised in that：Also include pre- debugging serial port circuit,
Which includes resistance R18 and connector UART1, and 5V voltages are accessed in resistance R18 one end, the 2nd pin of the other end and connector UART1 and
The 12nd pin connection of MCU units, the 10th pin connection of the 3rd pin and MCU units of connector UART1.
9. LED dimming control systems as claimed in claim 2, it is characterised in that：Operational amplifier U3A, operational amplifier U3B
AP4310 operational amplifier is adopted.
10. LED dimming control systems as claimed in claim 7, it is characterised in that：Optically isolated chip U7, optically isolated chip U8,
Optically isolated chip U9, optically isolated chip U10 are the optically isolated chips of PC357SMD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611222904.4A CN106507547B (en) | 2016-12-27 | 2016-12-27 | A kind of LED dimming control systems |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611222904.4A CN106507547B (en) | 2016-12-27 | 2016-12-27 | A kind of LED dimming control systems |
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| CN106507547A true CN106507547A (en) | 2017-03-15 |
| CN106507547B CN106507547B (en) | 2018-01-16 |
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| CN107801274A (en) * | 2017-11-10 | 2018-03-13 | 深圳市垅运照明电器有限公司 | A kind of constant power output LED drive power and its constant power output method |
| CN109862656A (en) * | 2018-10-29 | 2019-06-07 | 宁波耀泰电器有限公司 | A kind of light modulation shading process and its circuit |
| CN110850160A (en) * | 2019-11-05 | 2020-02-28 | 普联技术有限公司 | Method and device for measuring power consumption of LED lighting device and storage medium |
| CN112752374A (en) * | 2021-01-29 | 2021-05-04 | 广东东菱电源科技有限公司 | Potentiometer type constant power circuit, driving power supply and power supply constant power adjusting method |
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| CN112752374A (en) * | 2021-01-29 | 2021-05-04 | 广东东菱电源科技有限公司 | Potentiometer type constant power circuit, driving power supply and power supply constant power adjusting method |
| CN112752374B (en) * | 2021-01-29 | 2024-04-09 | 广东东菱电源科技有限公司 | Potentiometer type constant power circuit, driving power supply and power supply constant power regulating method |
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| Publication number | Publication date |
|---|---|
| CN106507547B (en) | 2018-01-16 |
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