CN106507547B - A kind of LED dimming control systems - Google Patents
A kind of LED dimming control systems Download PDFInfo
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- CN106507547B CN106507547B CN201611222904.4A CN201611222904A CN106507547B CN 106507547 B CN106507547 B CN 106507547B CN 201611222904 A CN201611222904 A CN 201611222904A CN 106507547 B CN106507547 B CN 106507547B
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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 by a controlling bus with the PWM sample circuits.The present invention is controlled LED power using single-chip microcomputer, MCU based on this exploitation can have powerful control function and real-time monitoring and control, so as to have the function that the electric current and limitation maximum load voltage that control LED power output, five in one controlling bus collects AD0 10V light modulation serial communications and controls PWM duty cycle as all over the body again, there is the dimming function of invariable power and constant current simultaneously, it is 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
In the market major part LED power is mainly adjusted and protected to light source by hardware chip logic, portable
Property it is poor, function is single, once need change or upgrade New function often waste time and energy.In addition the light modulation of in the market customer requirement
Mode is multifarious, and it is imperative to develop the powerful MCU of a strong control function of compatibility.
Therefore, the present inventor needs a kind of new technology of design badly to improve its problem.
The content of the invention
The present invention is intended to provide a kind of LED dimming control systems, it can control the electric current of LED power output and limitation
Maximum load voltage, while five in one controlling bus collects AD0-10V light modulation serial communications and controls PWM duty cycle as the whole body again, together
When there is the dimming function of invariable power and constant current, simple and convenient, the most of light modulation demand of compatible in the market.
In order to solve the above technical problems, 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 the 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 respectively with the MCU units, the monobus communicating circuit passes through a controlling bus and the DAL+ of the PWM sample circuits
Port connects.
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 is followed by with resistance R2, electric capacity C2
Ground；Resistance R11 and electric capacity C8 are connected between operational amplifier U3B the 6th pin and the 7th pin；The voltage loop circuit includes fortune
Amplifier U3A, resistance R20, resistance R23, electric capacity C13, diode D3 are calculated, resistance R20 one end and the 17th pin of MCU units connect
Connect, the other end is connected with operational amplifier U3A the 3rd pin；Resistance R23 and electric capacity C13 are connected on the 2nd of operational amplifier U3A
Between pin and the 1st pin；Operational amplifier U3B the 7th pin 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 operational amplifier U5 the 3rd pin and the 4th pin；Put with computing resistance R28 one end
Big device U5 the 4th pin connection, 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 both 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 resistance R16, variable resistor RT1, electric capacity C11, and resistance R16 one end is 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, operational amplifier U6 the 4th pin are connected by the 14th pin after resistance R32 with MCU units；Resistance R50 and
Electric capacity C191 is in parallel, and the two one end is connected with the 14th pin of MCU units, other end ground connection；Operational amplifier U6 the 1st pin difference
It is connected with resistance R29 and electric capacity C19, its 3rd pin is connected with the 4th pin；Resistance R29 is connected with a controlling bus.
Preferably, the monobus communicating circuit include optically isolated chip U7, optically isolated chip U8, optically isolated chip U9,
Optically isolated chip U10, voltage-regulator diode ZD1, voltage-regulator diode ZD2, resistance R42, resistance R46, wherein optically isolated chip U7 according to
It is secondary by being connected after voltage-regulator diode ZD1, resistance R42 with optically isolated chip U8 and optically isolated chip U10 the 2nd pin；It is optically isolated
Chip U9 connects after passing sequentially through voltage-regulator diode ZD2, resistance R46 with optically isolated chip U8 and optically isolated chip U10 the 2nd pin
Connect.
Preferably, in addition to pre- debugging serial port circuit, it includes resistance R18 and connector UART1, and resistance R18 mono- is terminated
Enter 5V voltages, the other end is connected with connector UART1 the 2nd pin and the 12nd pin of MCU units, connector UART1 the 3rd pin and
The 10th pin connection of MCU units.
Preferably, operational amplifier U3A, operational amplifier U3B use 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 comprises at least following beneficial effect：
LED dimming control systems of the present invention, LED power is controlled using single-chip microcomputer, the MCU based on this exploitation
Can there are powerful control function and real-time monitoring and control, it is maximum so as to reach the electric current of control LED power output and limitation
The effect of load voltage, five in one controlling bus collect AD0-10V light modulation serial communications and control PWM duty cycle as the whole body again, simultaneously
Dimming function with invariable power and constant current, simple and convenient, the most of light modulation demand of both compatible in the market, again without excessive
Lead allow using become complexity.
Brief 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.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
As shown in Figures 1 to 7, for meet the present invention a kind of LED dimming control systems, 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
Interrogate circuit, wherein the 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 is connected with the DAL+ ports of 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 operational amplifier U3B the 6th 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 and MCU units
The connection of the 17th pin, the other end is connected with operational amplifier U3A the 3rd pin；Resistance R23 and electric capacity C13 are connected on operation amplifier
Between device U3A the 2nd pin and the 1st pin；Operational amplifier U3B the 7th pin pass sequentially through after diode D1, diode D3 with computing
Amplifier U3A the 1st pin connection.
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 are connected in parallel between operational amplifier U5 the 3rd pin and the 4th pin；Resistance R28 mono-
End is connected with operational amplifier U5 the 4th pin, 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,
It is grounded after resistance R8, resistance R12, resistance R15 series connection；Electric capacity C10 is connected in parallel on resistance R15 both ends, and the of its one end and MCU units
8 pin connect, other end ground connection.
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, operational amplifier U6 the 4th pin are connected by the 14th pin after resistance R32 with MCU units；Electricity
It is in parallel to hinder R50 and electric capacity C191, the two one end is connected with the 14th pin of MCU units, other end ground connection；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 a 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, voltage-regulator diode ZD1, voltage-regulator diode ZD2, resistance R42, resistance R46, wherein optically isolated
Chip U7 connects after passing sequentially through voltage-regulator diode ZD1, resistance R42 with optically isolated chip U8 and optically isolated chip U10 the 2nd pin
Connect；Optically isolated chip U9 is passed sequentially through after voltage-regulator 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, it includes resistance R18 and connector UART1, resistance
5V voltages are accessed in R18 one end, and the other end is connected with connector UART1 the 2nd pin and the 12nd pin of MCU units, connector UART1
The 3rd pin connected with the 10th pin of MCU units.
Preferably, operational amplifier U3A, operational amplifier U3B use 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, in addition to power supply circuit, it is connected with the MCU units.In the present embodiment, the power supply circuit is one
5V power supply circuits, physical circuit is referring to other circuit structures removed in Fig. 1 outside MCU units and voltage sampling circuit part.By
It can understand in Fig. 1 and characterize, not repeat this time.
Preferably, operational amplifier U5, operational amplifier U6 use 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, caused two-way PWM waveform after single-chip microprocessor MCU cell processing
Driving voltage loop circuit and current loop circuit respectively, voltage loop circuit control maximum voltage are reached the standard grade, current loop circuit adjustment output
Current value, while it is used for voltage detecting and current detecting, by detecting in real time and calculating power, reach the effect of invariable power.
Reach power-fail memory function state using FLASH memory functions and the function of timing parameters is set.Monobus while compatible PWM, 0-
10V, the transmitting-receiving of serial communication, it is made up of two 485 symmetrical structures, both sides can receive the number of any one party transmission simultaneously
According to.Selection mode can use same root 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 to be come by detecting voltage sampling 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 is examined 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 allows voltage to carry out self-protection in particular value.
3rd, current detecting
Calculated with the similar mode of detection voltage, but because current curve is not up to standard being rectified using segmentation
Positive method makes current value be more nearly actual 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 changing the PWM duty cycle of 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=PWMT1/100；
Constant power mode is then that electric current by obtaining before and voltage value carry out that current real-time power is calculated
Calculating is compared in value with the performance number of setting again, and adjustment PWM duty cycle control output current value is balanced with load voltage
It is corrected to setting power.
Small range fluctuation is carried out in order to prevent from reaching power after set value simultaneously, the machine is designed as detecting its fluctuation and to it
Locked, reach the high invariable power state of precision.
5th, voltage adjusts：
Predominantly LED zero loads when maximum voltage setting, Voltage loop is adjusted by the PWM duty cycle of output and fed back, is reached
The settable effect of maximum.
6th, communication and timing：
All parameters of arrangement above can be all stored in flash by single-chip microcomputer and be preserved, and can also accomplish even if power-off
Last is adjusted to numerical value and pattern.
Timing mode is also based on this and designed；Such as：
Communication is then that the communication of upper and lower computer or hander is carried out using microcontroller serial port and unibus structure, 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 after its dutycycle being changed into using capacitor filtering stable voltage value in sample circuit
Carry out sampling comparison and reach same effect.
Program part can design as follows：
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the 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 caused.
Claims (9)
- A kind of 1. LED dimming control systems, it is characterised in that including：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 the electric current is adopted It is 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 by a controlling bus and the PWM The DAL+ ports connection of sample circuit；The monobus communicating circuit includes optically isolated chip U7, optically isolated chip U8, optically isolated core Piece U9, optically isolated chip U10, voltage-regulator diode ZD1, voltage-regulator diode ZD2, resistance R42, resistance R46, wherein optically isolated chip U7 is connected after passing sequentially through voltage-regulator diode ZD1, resistance R42 with optically isolated chip U8 and optically isolated chip U10 the 2nd pin；Light Isolating chip U9 pass sequentially through after voltage-regulator diode ZD2, resistance R46 with optically isolated chip U8 and optically isolated chip U10 the 2nd pin Connection.
- 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 is connected, and the other end is grounded after being connected with resistance R2, electric capacity C2；Resistance R11 and electric capacity C8 is 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 are connected with the 17th pin of MCU units, and the other end is connected with operational amplifier U3A the 3rd pin；Resistance R23 And electric capacity C13 is connected between operational amplifier U3A the 2nd pin and the 1st pin；Operational amplifier U3B the 7th pin passes sequentially through two It is connected after pole pipe D1, diode D3 with operational amplifier U3A the 1st pin.
- 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 operational amplifier U5 the 4th pin, the 9th pin of the other end and MCU units Connected with electric capacity C18.
- 4. LED dimming control systems as claimed in claim 1, it is characterised in that：The voltage sampling circuit include resistance R8, Resistance R12, resistance R15, electric capacity C10, it is grounded after resistance R8, resistance R12, resistance R15 series connection；Electric capacity C10 is connected in parallel on resistance R15 Both ends, its one end are connected with the 8th pin of MCU units, other end ground connection.
- 5. LED dimming control systems as claimed in claim 1, it is characterised in that：The temperature sampling circuit includes resistance R16, variable resistor RT1, electric capacity C11, resistance R16 one end intervention 5V power supplys；The other end and variable resistor RT1 and MCU unit 13rd pin connects, and is grounded after variable resistor RT1 and electric capacity C11 parallel connections.
- 6. LED dimming control systems as claimed in claim 1, it is characterised in that：The PWM sample circuits include operation amplifier Device U6, resistance R29, resistance R32, resistance R50, electric capacity C19, electric capacity C191, operational amplifier U6 the 4th pin pass through resistance R32 It is connected afterwards with the 14th pin of MCU units；Resistance R50 and electric capacity C191 is in parallel, and the two one end is connected with the 14th pin of MCU units, The other end is grounded；Operational amplifier U6 the 1st 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 a controlling bus.
- 7. LED dimming control systems as claimed in claim 1, it is characterised in that：Also include pre- debugging serial port circuit, it includes 5V voltages are accessed in resistance R18 and connector UART1, resistance R18 one end, and the 2nd pin and MCU of the other end and connector UART1 are mono- The 12nd pin connection of member, connector UART1 the 3rd pin connect with the 10th pin of MCU units.
- 8. LED dimming control systems as claimed in claim 2, it is characterised in that：Operational amplifier U3A, operational amplifier U3B Use AP4310 operational amplifiers.
- 9. LED dimming control systems as claimed in claim 1, 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.
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| CN201611222904.4A CN106507547B (en) | 2016-12-27 | 2016-12-27 | A kind of LED dimming control systems |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107801274B (en) * | 2017-11-10 | 2020-05-26 | 深圳市垅运照明电器有限公司 | Constant-power output LED driving power supply and constant-power output method thereof |
| 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 |
| 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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