CN208029150U - Composite smart system - Google Patents
Composite smart system Download PDFInfo
- Publication number
- CN208029150U CN208029150U CN201820432314.2U CN201820432314U CN208029150U CN 208029150 U CN208029150 U CN 208029150U CN 201820432314 U CN201820432314 U CN 201820432314U CN 208029150 U CN208029150 U CN 208029150U
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- China
- Prior art keywords
- pulse
- led drive
- resistance
- microprocessor
- regulated output
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of composite smart systems, including microprocessor unit, LED drive unit, input filter circuit, 5V voltage conversion circuits；The microprocessor unit includes microprocessor and pulse-width regulated output circuit.By the control of pwm signal, so that the load current of LED driving main circuit outputs is changed with the variation of PWM duty cycle, to achieve the purpose that be dimmed with dim signal, also achieved the effect that composite smart.PWM dim it is linear spend, the advantage that light modulation precision is high.
Description
Technical field
The utility model belongs to electronic technology field, more particularly to a kind of composite smart system.
Background technology
LED illumination is two Pius XIs circle one of high-technology field most with prospects, it is often more important that has resource in mind
Rationally utilization and environmental protection, have requirements at the higher level under the conditions of meeting lighting quality and visual environment.The light modulation side generally used
Formula has：Controllable silicon light modulation, PWM light modulations, linear voltage light modulation.These dimming modes all have that dimming resolution is low, very
Hardly possible realizes the visual effect of the soft variation of light.
Utility model content
The purpose of this utility model is that in view of the above-mentioned problems, proposing a kind of composite smart system.
A kind of composite smart system, including the conversion of microprocessor unit, LED drive unit, input filter circuit, 5V voltages
Circuit；The microprocessor unit includes microprocessor and pulse-width regulated output circuit.
Initial voltage signal is connected by input filter circuit with 5V voltage conversion circuits, 5V voltage conversion circuit output ends
It is connected with power supply of microprocessor input terminal, 5V voltage conversion circuits output termination LED drive chip power input.
The pulse-width regulated output circuit includes the first pulse-width regulated output circuit, the second pulse-width regulated output circuit；The
One pulse-width regulated output circuit includes first resistor；Second pulse-width regulated output circuit includes second resistance and NPN triode.
Microprocessor the first pulse-width regulated output end is connected by first resistor with LED drive chip current input terminal.
Microprocessor the second pulse-width regulated output end is connected by second resistance with NPN transistor base；NPN triode collection
Electrode connects LED drive chip current input terminal；NPN triode emitter is grounded.
LED drive unit exports terminating load.
Preferably, the power supply of microprocessor input terminal passes through the first capacity earth.
Preferably, the first pulse-width regulated output circuit further includes the 5th resistance, the second capacitance；First resistor includes the
Three resistance and the 4th resistance by the 5th resistance eutral grounding and pass through the second capacity earth between 3rd resistor and the 4th resistance.
Preferably, the LED drive unit includes LED drive chip, third capacitance, the 5th capacitance, the 6th resistance, LED
Load；Power input be connected with filter circuit output end LED drive chip voltage output terminate the 5th capacitance first end, load
Anode；LED drive chip current output terminal connects the 5th capacitance second end, load cathode, and passes through the 5th resistance eutral grounding.
Preferably, the LED drive chip power input passes through third capacity earth.
Due to the photosensitive nonlinear characteristic of human eye, more sensitive, composite smart is changed for the weaker ambient brightness of light
It is adjusted aiming at this characteristic is fine to dim light, first passes through PWM1 and output current is transferred to a smaller value, then
With PWM2 intense adjustment output currents.
Description of the drawings
Fig. 1 is input voltage filtering conversion circuit；
Fig. 2 is a kind of schematic diagram of composite smart system.
Specific implementation mode
To keep the purpose, technical scheme and advantage of utility model embodiment clearer, below in conjunction with the utility model
Attached drawing in embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment be the utility model a part of the embodiment, instead of all the embodiments.Described in usual attached drawing here and show
The component of the utility model embodiment gone out can be arranged and be designed with a variety of different configurations.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained without creative efforts, all
Belong to the range of the utility model protection.
The present embodiment provides a kind of composite smart systems, including microprocessor unit, LED drive unit, input filter electricity
Road, 5V voltage conversion circuits；The microprocessor unit includes microprocessor and pulse-width regulated output circuit.
Initial voltage signal is connected by input filter circuit with 5V voltage conversion circuits, 5V voltage conversion circuit output ends
It is connected with power supply of microprocessor input terminal, 5V voltage conversion circuits output termination LED drive chip power input.
The pulse-width regulated output circuit includes the first pulse-width regulated output circuit, the second pulse-width regulated output circuit；The
One pulse-width regulated output circuit includes first resistor；Second pulse-width regulated output circuit includes second resistance and NPN triode.
Microprocessor the first pulse-width regulated output end is connected by first resistor with LED drive chip current input terminal.
Microprocessor the second pulse-width regulated output end is connected by second resistance with NPN transistor base；NPN triode collection
Electrode connects LED drive chip current input terminal；NPN triode emitter is grounded.
LED drive unit exports terminating load.
Preferably, the power supply of microprocessor input terminal passes through the first capacity earth.
Preferably, the first pulse-width regulated output circuit further includes the 5th resistance, the second capacitance；First resistor includes the
Three resistance and the 4th resistance by the 5th resistance eutral grounding and pass through the second capacity earth between 3rd resistor and the 4th resistance.
Preferably, the LED drive unit includes LED drive chip, third capacitance, the 5th capacitance, the 6th resistance, LED
Load；Power input be connected with filter circuit output end LED drive chip voltage output terminate the 5th capacitance first end, load
Anode；LED drive chip current output terminal connects the 5th capacitance second end, load cathode, and passes through the 5th resistance eutral grounding.
Preferably, the LED drive chip power input passes through third capacity earth.
When needing to dim LED, reduces the 5 foot PWM high level width of MCU and the 4 foot voltages of U1 is made to reduce, to reduce
Smaller value is outputed current to, then the 4 foot voltages of U1 are subjected to PWM modulation by the 3 foot PWM of MCU, is further accurately adjusted defeated
Go out electric current.
The 4 corresponding output current 0-100% variations of foot voltage 0-1V variations of U1, the 5 foot PWM1 level of MCU are by R1, R2 points
Pressure, the filtered values of C2 are 1V.Therefore, electric current larger stage, PWM1 duty ratios and output current are in a linear relationship.Electric current is smaller
Stage, output current and the product of PWM1 and PWM2 are in a linear relationship.
When the 4 foot voltages of U1 are 1V, output current 1A, PWM1 sky ratio D1 is 10%, PWM2 sky ratios D2 when being 50%, defeated
Go out electric current Io=1A*D1*D2.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set
Set ", " installation ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can also be electrical connection.
Claims (5)
1. a kind of composite smart system, which is characterized in that including microprocessor unit, LED drive unit, input filter circuit,
5V voltage conversion circuits；The microprocessor unit includes microprocessor and pulse-width regulated output circuit；
Initial voltage signal is connected by input filter circuit with 5V voltage conversion circuits, 5V voltage conversion circuits output end with it is micro-
Processor power supply input terminal is connected, 5V voltage conversion circuits output termination LED drive chip power input；
The pulse-width regulated output circuit includes the first pulse-width regulated output circuit, the second pulse-width regulated output circuit；First arteries and veins
It includes first resistor that width, which adjusts output circuit,；Second pulse-width regulated output circuit includes second resistance and NPN triode；
Microprocessor the first pulse-width regulated output end is connected by first resistor with LED drive chip current input terminal；
Microprocessor the second pulse-width regulated output end is connected by second resistance with NPN transistor base；NPN triode collector
Connect LED drive chip current input terminal；NPN triode emitter is grounded；
LED drive unit exports terminating load.
2. composite smart system according to claim 1, which is characterized in that the power supply of microprocessor input terminal passes through first
Capacity earth.
3. composite smart system according to claim 1, which is characterized in that the first pulse-width regulated output circuit further includes
5th resistance, the second capacitance；First resistor includes 3rd resistor and the 4th resistance, passes through between 3rd resistor and the 4th resistance
Five resistance eutral groundings and pass through the second capacity earth.
4. composite smart system according to claim 1, which is characterized in that the LED drive unit includes LED driving cores
Piece, third capacitance, the 5th capacitance, the 6th resistance, LED load；Power input be connected with filter circuit output end LED driving core
Piece voltage output terminates the 5th capacitance first end, load anode；LED drive chip current output terminal connect the 5th capacitance second end,
Cathode is loaded, and passes through the 5th resistance eutral grounding.
5. composite smart system according to claim 1, which is characterized in that the LED drive chip power input passes through
Third capacity earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820432314.2U CN208029150U (en) | 2018-03-29 | 2018-03-29 | Composite smart system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820432314.2U CN208029150U (en) | 2018-03-29 | 2018-03-29 | Composite smart system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208029150U true CN208029150U (en) | 2018-10-30 |
Family
ID=63908606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820432314.2U Expired - Fee Related CN208029150U (en) | 2018-03-29 | 2018-03-29 | Composite smart system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208029150U (en) |
-
2018
- 2018-03-29 CN CN201820432314.2U patent/CN208029150U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181030 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |