CN108667277A - A kind of New LED driving power - Google Patents
A kind of New LED driving power Download PDFInfo
- Publication number
- CN108667277A CN108667277A CN201810245369.7A CN201810245369A CN108667277A CN 108667277 A CN108667277 A CN 108667277A CN 201810245369 A CN201810245369 A CN 201810245369A CN 108667277 A CN108667277 A CN 108667277A
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- CN
- China
- Prior art keywords
- module
- resistance
- output end
- timer
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Led Devices (AREA)
Abstract
The invention discloses a kind of New LED driving powers, including EMI modules, rectification module, input filter module, PWM control modules, switch voltage-stabilizing module, sampling feedback module and output filter module；The switch voltage-stabilizing module includes the driving unit of switching tube and driving switch pipe, the PWM control modules include 555 timers for exporting certain duty cycle pulse signal, 555 timer is connected with driving unit input terminal, the driving unit output end is connected with switch controlled end, and the switching tube output terminates between input filter module and switch voltage-stabilizing module.The present invention is by exporting the pulse signal of certain duty ratio based on the PWM control modules of 555 timers, the conducting and cut-off that the pulse signal passes through driving unit driving switch pipe, to replace effect of the constant-current driven chip in Switching Power Supply, the design difficulty for effectively reducing Switching Power Supply, reduces the cost of design.The invention is for driving LED light source.
Description
Technical field
The present invention relates to electric circuit constructions, more specifically to a kind of LED drive power circuit.
Background technology
In recent years, with the increasingly raising of LED production Technologies, the luminous efficiency of LED significantly improves, therefore present city
Illuminating product on face generally uses LED light product-derived.
Switching Power Supply is generally used to realize that the driving to LED light source, Switching Power Supply are mainly based upon pulse in the prior art
Width modulated (PWM) principle, the pulse signal of certain duty ratio is exported using constant-current driven chip, and the pulse signal is for driving
The time with cut-off is connected to stabilize the output voltage by controlling switching tube in the conducting and cut-off of switching tube.In the prior art,
The periphery circuit design of constant-current driven chip is complex, and constant-current driven chip cost is costly, undoubtedly increases LED drives
The cost of manufacture of dynamic power supply.
Invention content
The technical problem to be solved by the present invention is to：A kind of LED drive power based on 555 Timer Controllings is provided.
The solution that the present invention solves its technical problem is：
A kind of New LED driving power, including EMI modules, rectification module, input filter module, PWM control modules, open
Voltage stabilizing module, sampling feedback module and output filter module are closed, the EMI modules are connected with rectification module input terminal, described
Rectification module output end is connected with input filter module input terminal, and the input filter module output end and switch voltage-stabilizing module are defeated
Enter end to be connected, the switch voltage-stabilizing module output end is connected with output filter module input terminal, the output filter module output
End is connected with sampling feedback module input, and the sampling feedback module output end is connected with PWM control module input terminals, described
PWM control modules output end is connected with switch voltage-stabilizing module input；The switch voltage-stabilizing module includes switching tube and driving
The driving unit of switching tube, the PWM control modules include 555 timers for exporting certain duty cycle pulse signal, institute
It states 555 timers with driving unit input terminal to be connected, the driving unit output end is connected with switch controlled end, the switch
Pipe output terminates between input filter module and switch voltage-stabilizing module.
As a further improvement of the above technical scheme, the PWM control modules include 555 timers, resistance R1, resistance
R2, digital regulation resistance R3, diode D1, diode D2 and the both ends capacitance C1, the resistance R1 respectively with 555 timer VCC
Pin and DIS pins are connected, and the diode D1 anodes are connected with 555 timer DIS pins, the diode D1 cathode and
555 timer THR pins are connected, and the 555 timer THR pins and TRIG pins are connected, one end the resistance R2 and two
Pole pipe D1 anodes are connected, and the other end is connected with diode D2 cathode, the diode D2 anodes and 555 timer THR pin phases
Even, the both ends the capacitance C1 are connected with 555 timer TRIG pins and GND pin respectively, the digital regulation resistance R3 and electricity
It is in parallel to hinder R2, the digital regulation resistance R3 is connected with sampling feedback module output end.
As a further improvement of the above technical scheme, the sampling feedback module includes resistance R4, resistance R5 and mould
Number conversion chip, the resistance R4 and resistance R5 are connected between output filter module output end and ground, the analog-to-digital conversion core
Piece input terminates between resistance R4 and resistance R5, and the modulus conversion chip output end is connected with digital regulation resistance R3.
As a further improvement of the above technical scheme, the driving unit includes photoelectrical coupler, 555 timer
OUT pins are connected with photoelectrical coupler input terminal, and the photoelectric coupler output end is connected with switch controlled end.
As a further improvement of the above technical scheme, the switch voltage-stabilizing module further includes inductance L1, fly-wheel diode
D3 and capacitance C2, the input filter module are connected by inductance L1 with 3 anode of sustained diode, the fly-wheel diode
D3 cathode are connected with capacitance C2, and the switching tube output end is connected with 3 anode of sustained diode.
The beneficial effects of the invention are as follows：The present invention exports certain duty ratio by the PWM control modules based on 555 timers
Pulse signal, the pulse signal is by the conducting and cut-off of driving unit driving switch pipe, to exist instead of constant-current driven chip
Effect in Switching Power Supply effectively reduces the design difficulty of Switching Power Supply, reduces the cost of design.The invention is for driving
LED light source.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described.Obviously, described attached drawing is a part of the embodiment of the present invention, rather than is all implemented
Example, those skilled in the art without creative efforts, can also be obtained according to these attached drawings other designs
Scheme and attached drawing.
Fig. 1 is the circuit theory frame diagram of the present invention；
Fig. 2 is the sampling feedback module and PWM control module circuit connection diagrams of the present invention；
Fig. 3 is the switch voltage-stabilizing modular circuit connection figure of the present invention.
Specific implementation mode
The technique effect of the design of the present invention, concrete structure and generation is carried out below with reference to embodiment and attached drawing clear
Chu, complete description, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair
Bright a part of the embodiment, rather than whole embodiments, based on the embodiment of the present invention, those skilled in the art are not being paid
The other embodiment obtained under the premise of creative work, belongs to the scope of protection of the invention.In addition, be previously mentioned in text
All connection/connection relations, not single finger element directly connect, and refer to that can be added deduct according to specific implementation situation by adding
Few connecting element, to form more preferably circuit structure.Each technical characteristic in the invention, in not conflicting conflict
Under the premise of can be with combination of interactions.
Referring to Fig.1~Fig. 3, the invention disclose a kind of LED power driving circuit based on 555 Timer Controllings,
Including EMI modules, rectification module, input filter module, PWM control modules, switch voltage-stabilizing module, sampling feedback module and defeated
Go out filter module, the EMI modules are connected with rectification module input terminal, and the rectification module output end and input filter module are defeated
Enter end to be connected, the input filter module output end is connected with switch voltage-stabilizing module input, the switch voltage-stabilizing module output
End is connected with output filter module input terminal, and the output filter module output end is connected with sampling feedback module input, institute
It states sampling feedback module output end with PWM control module input terminals to be connected, the PWM control modules output end and switch voltage-stabilizing mould
Block input terminal is connected；The switch voltage-stabilizing module includes the driving unit of switching tube and driving switch pipe, and the PWM controls mould
Block includes 555 timers for exporting certain duty cycle pulse signal, 555 timer and driving unit input terminal phase
Even, the driving unit output end is connected with switch controlled end, and the switching tube output terminates at input filter module and opens
Between the Voltage stabilizing module of pass.Specifically, the present invention is by exporting the arteries and veins of certain duty ratio based on the PWM control modules of 555 timers
Signal is rushed, which is being switched by the conducting and cut-off of driving unit driving switch pipe with replacement constant-current driven chip
Effect in power supply effectively reduces the design difficulty of Switching Power Supply, reduces the cost of design.
It is further used as preferred embodiment, in the invention specific implementation mode, the PWM control modules include
555 timers, resistance R1, resistance R2, digital regulation resistance R3, diode D1, diode D2 and capacitance C1, the resistance R1 two
End is connected with 555 timer VCC pins and DIS pins respectively, the diode D1 anodes and 555 timer DIS pin phases
Even, the diode D1 cathode are connected with 555 timer THR pins, the 555 timer THR pins and TRIG pin phases
Even, the one end the resistance R2 is connected with diode D1 anodes, and the other end is connected with diode D2 cathode, the diode D2 anodes
It is connected with 555 timer THR pins, the both ends the capacitance C1 are connected with 555 timer TRIG pins and GND pin respectively,
The digital regulation resistance R3 is in parallel with resistance R2, and the digital regulation resistance R3 is connected with sampling feedback module output end.
It is further used as preferred embodiment, in the invention specific implementation mode, the sampling feedback module packet
Include resistance R4, resistance R5 and modulus conversion chip, the resistance R4 and resistance R5 be connected on output filter module output end with
Between ground, modulus conversion chip input terminates between resistance R4 and resistance R5, the modulus conversion chip output end with
Digital regulation resistance R3 is connected.Specifically, the invention utilizes output voltages of the resistance R4 and resistance R5 to output filter module
It is sampled, voltage analog signal is converted into digital signal using modulus conversion chip, change number using the digital signal
The resistance value of potentiometer R3 is realized and is exported to LED drive power to change the duty ratio of PWM control module output pulse signals
The closed loop control function of voltage.
It is further used as preferred embodiment, to improve the driving capability of 555 timer output end switch tubes, this hair
In bright creation specific implementation mode, the driving unit includes photoelectrical coupler, the 555 timer OUT pins and photoelectricity coupling
Clutch input terminal is connected, and the photoelectric coupler output end is connected with switch controlled end.
It is further used as preferred embodiment, in the invention specific implementation mode, the switch voltage-stabilizing module is also
Including inductance L1, sustained diode 3 and capacitance C2, the input filter module by inductance L1 and sustained diode 3 just
Extremely it is connected, 3 cathode of the sustained diode is connected with capacitance C2, the switching tube output end and the positive phase of sustained diode 3
Even.The more kinds of experiments based on those skilled in the art, it was demonstrated that the invention is suitable for a variety of switch power supply topological structures, especially
Suitable for the small-power switching power-supply based on BUCK buck convertors.
The better embodiment of the present invention is illustrated above, but the invention is not limited to the implementation
Example, those skilled in the art can also make various equivalent modifications or be replaced under the premise of without prejudice to spirit of that invention
It changes, these equivalent modifications or replacement are all contained in the application claim limited range.
Claims (5)
1. a kind of New LED driving power, it is characterised in that：Including EMI modules, rectification module, input filter module, PWM controls
Molding block, switch voltage-stabilizing module, sampling feedback module and output filter module, the EMI modules and rectification module input terminal
It is connected, the rectification module output end is connected with input filter module input terminal, the input filter module output end and switch
Voltage stabilizing module input terminal is connected, and the switch voltage-stabilizing module output end is connected with output filter module input terminal, the output filter
Wave module output end is connected with sampling feedback module input, and the sampling feedback module output end is inputted with PWM control modules
End is connected, and the PWM control modules output end is connected with switch voltage-stabilizing module input；The switch voltage-stabilizing module includes switch
The driving unit of pipe and driving switch pipe, the PWM control modules include 555 for exporting certain duty cycle pulse signal
Timer, 555 timer are connected with driving unit input terminal, the driving unit output end and switch controlled end phase
Even, the switching tube output terminates between input filter module and switch voltage-stabilizing module.
2. a kind of New LED driving power according to claim 1, it is characterised in that：The PWM control modules include
555 timers, resistance R1, resistance R2, digital regulation resistance R3, diode D1, diode D2 and capacitance C1, the resistance R1 two
End is connected with 555 timer VCC pins and DIS pins respectively, the diode D1 anodes and 555 timer DIS pin phases
Even, the diode D1 cathode are connected with 555 timer THR pins, the 555 timer THR pins and TRIG pin phases
Even, the one end the resistance R2 is connected with diode D1 anodes, and the other end is connected with diode D2 cathode, the diode D2 anodes
It is connected with 555 timer THR pins, the both ends the capacitance C1 are connected with 555 timer TRIG pins and GND pin respectively,
The digital regulation resistance R3 is in parallel with resistance R2, and the digital regulation resistance R3 is connected with sampling feedback module output end.
3. a kind of New LED driving power according to claim 2, it is characterised in that：The sampling feedback module includes
Resistance R4, resistance R5 and modulus conversion chip, the resistance R4 and resistance R5 are connected on output filter module output end and ground
Between, the modulus conversion chip input terminates between resistance R4 and resistance R5, the modulus conversion chip output end and number
Word potentiometer R3 is connected.
4. a kind of New LED driving power according to claim 3, it is characterised in that：The driving unit includes photoelectricity
Coupler, the 555 timer OUT pins are connected with photoelectrical coupler input terminal, the photoelectric coupler output end and switch
Pipe control terminal is connected.
5. a kind of New LED driving power according to claim 4, it is characterised in that：The switch voltage-stabilizing module is also wrapped
Inductance L1, sustained diode 3 and capacitance C2 are included, the input filter module passes through 3 anode of inductance L1 and sustained diode
It is connected, 3 cathode of the sustained diode is connected with capacitance C2, and the switching tube output end is connected with 3 anode of sustained diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810245369.7A CN108667277A (en) | 2018-03-23 | 2018-03-23 | A kind of New LED driving power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810245369.7A CN108667277A (en) | 2018-03-23 | 2018-03-23 | A kind of New LED driving power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108667277A true CN108667277A (en) | 2018-10-16 |
Family
ID=63782367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810245369.7A Pending CN108667277A (en) | 2018-03-23 | 2018-03-23 | A kind of New LED driving power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108667277A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101169911A (en) * | 2007-08-29 | 2008-04-30 | 康佳集团股份有限公司 | LED display device for vehicle |
| CN104754793A (en) * | 2013-12-25 | 2015-07-01 | 深圳市海洋王照明工程有限公司 | Voltage-reduction constant-current LED (Light Emitting Diode) driving circuit, driving device and lighting system |
-
2018
- 2018-03-23 CN CN201810245369.7A patent/CN108667277A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101169911A (en) * | 2007-08-29 | 2008-04-30 | 康佳集团股份有限公司 | LED display device for vehicle |
| CN104754793A (en) * | 2013-12-25 | 2015-07-01 | 深圳市海洋王照明工程有限公司 | Voltage-reduction constant-current LED (Light Emitting Diode) driving circuit, driving device and lighting system |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181016 |
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| RJ01 | Rejection of invention patent application after publication |