CN107277972A - A kind of LED power circuit - Google Patents
A kind of LED power circuit Download PDFInfo
- Publication number
- CN107277972A CN107277972A CN201710489754.1A CN201710489754A CN107277972A CN 107277972 A CN107277972 A CN 107277972A CN 201710489754 A CN201710489754 A CN 201710489754A CN 107277972 A CN107277972 A CN 107277972A
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- China
- Prior art keywords
- resistance
- triode
- electric capacity
- circuit
- chip
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED power circuit, including output circuit, optical coupling isolation circuit, detection circuit and on-off circuit, the optical coupling isolation circuit includes chip IC 1, switch S1 and resistance R2, detect that circuit includes triode V1, triode V2 and triode V3, on-off circuit includes resistance R5 and bidirectional thyristor Q1, output circuit includes resistance R11 and electric capacity C6, resistance R10 one end connection resistance R11, electric capacity C6 and 220V civil power.LED power circuit structure of the present invention is simple, component is few, by the mutual cooperation of photo-coupler, triode and unidirectional thyristor, using the stabilizing voltage characteristic of electric capacity, realizes the control to output voltage, effectively protects LED, improves the service life of LED.Therefore have the advantages that cost is low, easy to use and performance is stable.
Description
Technical field
The present invention relates to a kind of power circuit, specifically a kind of LED power circuit.
Background technology
As the negative effect caused by Global Greenhouse Effect constantly shows, every country all makees energy-saving and emission-reduction in the world
By the major issue that must take into consideration in native economic development, LED illumination technology is exactly arisen at the historic moment under this background
An emerging power-saving technology.Current LED illumination product has been had been applied in daily life, with developing rapidly for LED.It is existing
There is the conventional light source compared in white LED light source long lifespan, solid state lighting to be hardly damaged, the environmental protection of specular removal, mercury-free, antidetonation etc.
Advantage, future will turn into third generation light source, will bring the revolution again of lighting field.
With the continuous improvement of people's living standards, electronic equipment has become a part essential in life, especially
It is that life, work that various household electrical appliance give people bring great convenience, and this kind of electronic installation has required an essence
Spend the larger voltage stabilizing AC power of higher, electric current.The AC power species of existing market is various, and its mid and low-end products is especially more,
Although low-end product has the advantage of price with respect to high-end product, quality often complies with one's wishes not to the utmost, and common power supply is present
The defects such as function is single, short life, interference free performance difference, although and high-end product reliable in quality, safety and stability, price height
It is high also to allow people to hang back.Therefore need to be improved.
The content of the invention
It is an object of the invention to provide a kind of LED power circuit, to solve the problems mentioned in the above background technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of LED power circuit, including output circuit, optical coupling isolation circuit, detection circuit and on-off circuit, the optocoupler
Isolation circuit includes chip IC 1, switch S1 and resistance R2, and detection circuit includes triode V1, triode V2 and triode V3, opened
Powered-down road includes resistance R5 and bidirectional thyristor Q1, and output circuit includes resistance R11 and electric capacity C6, and resistance R10 one end is connected
Resistance R11, electric capacity C6 and 220V civil power, the resistance R10 other end connection diode D1 negative electrode and switch S2, diode D1's
Anode connects resistance R1, resistance R1 other end connection electric capacity C1, the other end and bidirectional thyristor Q1 of electric capacity C2,220V civil power
A main electrode, the resistance R11 other end connection electric capacity C6 other end and an input of rectification circuit, electric capacity C1's
Other end connection resistance R3, switch S1 and chip IC 1 pin 3, resistance R3 other end connection bidirectional thyristor Q1 control
Pole, the output end of rectification circuit is connected to LED two ends, electric capacity the C2 other end connection resistance R4, resistance R4 other end connection
Resistance R5, electric capacity C3, electric capacity C4, electric capacity C5, diode D3 anode, diode D5 anode, the other end for loading A and unidirectional
IGCT Q1 another main electrode, switch the S1 other end connection resistance R2, resistance R2 other end connection resistance R5's is another
The pin 4 of one end and chip IC 1, the connecting triode V1 of pin 2 of chip IC 1 colelctor electrode, triode V1 emitter stage connection
Triode V2 colelctor electrode and resistance R7, the connection resistance of pin 1 R8, the resistance R9 and triode V2 emitter stage of chip IC 1, electricity
Hinder a R9 other end connection potentiometer RP1 fixing end, diode D4 negative electrode, the resistance R7 other end, electric capacity C5
The negative electrode of the other end and diode D2, triode V2 base stage connection resistance the R8 other end and triode V3 colelctor electrode, three
Pole pipe V3 base stage connection potentiometer RP1 sliding end.
It is used as the preferred scheme of the present invention：The model 4N25 of the chip IC 1.
It is used as the preferred scheme of the present invention：The triode V1 and V3 is N-type triode, and triode N2 is the pole of p-type three
Pipe.
It is used as the preferred scheme of the present invention：The resistance R11 and electric capacity C6 constitute capacitance-resistance voltage reduction circuit.
It is used as the preferred scheme of the present invention：The full-bridge rectification that the rectification circuit is made up of 4 IN4001 type diodes
Circuit.
It is used as the preferred scheme of the present invention：The model BT131-600E of the bidirectional triode thyristor Q1.
Compared with prior art, the beneficial effects of the invention are as follows：LED power circuit structure of the present invention is simple, component is few,
By the mutual cooperation of photo-coupler, triode and unidirectional thyristor, using the stabilizing voltage characteristic of electric capacity, realize to output voltage
Control, effectively protect LED, improve the service life of LED.Therefore it is low, easy to use and performance stabilization excellent with cost
Point.
Brief description of the drawings
Fig. 1 is the circuit diagram of LED power circuit.
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 is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.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.
Referring to Fig. 1, in the embodiment of the present invention, a kind of LED power circuit, including output circuit, optical coupling isolation circuit, inspection
Slowdown monitoring circuit and on-off circuit, the optical coupling isolation circuit include chip IC 1, switch S1 and resistance R2, and detection circuit includes three poles
Pipe V1, triode V2 and triode V3, on-off circuit include resistance R5 and bidirectional thyristor Q1, and output circuit includes resistance R11
With electric capacity C6, resistance R10 one end connection resistance R11, electric capacity C6 and 220V civil power, resistance R10 other end connection diode
D1 negative electrode and switch S2, diode D1 anode connection resistance R1, resistance R1 other end connection electric capacity C1, electric capacity C2,
The other end of 220V civil powers and a bidirectional thyristor Q1 main electrode, the resistance R11 other end connection electric capacity C6 other end
With an input of rectification circuit, electric capacity C1 other end connection resistance R3, switch S1 and the pin 3 of chip IC 1, resistance R3
Other end connection bidirectional thyristor Q1 control pole, the output end of rectification circuit is connected to LED two ends, the electric capacity C2 other end
Connect resistance R4, resistance R4 other end connection resistance R5, electric capacity C3, electric capacity C4, electric capacity C5, diode D3 anode, two poles
Another main electrode of pipe D5 anode, the other end for loading A and unidirectional thyristor Q1, switch S1 other end connection resistance
R2, resistance the R2 other end connection resistance R5 other end and the pin 4 of chip IC 1, the connecting triode of pin 2 of chip IC 1
V1 colelctor electrode, triode V1 emitter stage connecting triode V2 colelctor electrode and resistance R7, the pin 1 of chip IC 1 connects electricity
Hinder R8, resistance R9 and triode V2 emitter stage, the resistance R9 other end connection potentiometer RP1 fixing end, a diode
D4 negative electrode, the resistance R7 other end, the electric capacity C5 other end and diode D2 negative electrode, triode V2 base stage connection resistance
The R8 other end and triode V3 colelctor electrode, triode V3 base stage connection potentiometer RP1 sliding end.
The model 4N25 of chip IC 1.Triode V1 and V3 are N-type triode, and triode N2 is p-type triode.Electricity
Hinder R11 and electric capacity C6 composition capacitance-resistance voltage reduction circuits.The full-bridge rectification electricity that rectification circuit is made up of 4 IN4001 type diodes
Road.Bidirectional triode thyristor Q1 model BT131-600E.
The present invention operation principle be：When switching S1 closures, the circuit phase shift that electric current is constituted through load and R5, R2 and C1
Afterwards, by resistance R3, two-way intergranular pipe Q1 is triggered, is turned it on.Because R2 resistance is very big, thus the bidirectional thyristor Q angles of flow compared with
It is small, at this moment obtain a relatively low voltage in output end.After start, civil power gives control electricity through R1, D1 and D2 two-way step-down rectifier
Road provides power supply.When the output voltage is low, powered by R1, D1；When output voltage is higher, powered by R10, D2.At C5 two ends
The voltage of generation is first sampled use, then after D5 lowering and stabilizing blood pressures, is used as the power supply of control circuit.Electric current charges through R6 to C3, one section
After time, when charging voltage is more than D3 voltage stabilizing values, V1 is gradually turned on.Electric current is through the light-emitting diodes in R9, photoelectrical coupler IC1
Pipe, V1, D3, are gradually reduced the photo resistance in photoelectrical coupler, and C1 phase shifting angles are gradually reduced, the IGCT Q1 angles of flow
Increase, output voltage gradually rises.When output voltage exceedes the voltage stabilizing value of setting, the voltage increase at C5 two ends, V3 base stages are through electricity
Voltage rise after the device RP1 partial pressures of position.After the voltage exceedes D3 voltage stabilizing value, V3 is begun to turn on, and produces shunting, is produced on R8
Raw voltage drop.Due to R9 metering function, the electric current of light emitting diode reduces in photoelectrical coupler, and the resistance of photo resistance increases
Greatly, the V angle of flow reduces, and output voltage reduces.When the reduction of defeated people's voltage causes output voltage to reduce, situation is then on the contrary, control
Circuit processed increases the IGCT Q1 angles of flow, exports also with increase.So, output voltage is protected under the negative feedback of circuit
It is fixed to keep steady.During shutdown, S1 is disconnected, C5, C4 both end voltage are gradually reduced, C3 both end voltages are also declined by D4 electric discharges with C4.When
When C4, C3 voltage drop to certain value, light emitting diode ends in photoelectrical coupler, and photo resistance is in high-impedance state, and D3 can not
Turn on and block V3, output voltage is 0.Because C5, C4, C3 both end voltage can not be mutated, thus output voltage can only gradually under
0 is reduced to, output end, which connects inductive load two ends, will not produce overvoltage, this voltage drops by resistance R11 and electric capacity C6 capacitance-resistance
It is added on rectification circuit, is output to after step-down rectifier in LED again after pressure, meets LED normal work.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as to the claim involved by limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It may be appreciated other embodiment.
Claims (6)
1. a kind of LED power circuit, including output circuit, optical coupling isolation circuit, detection circuit and on-off circuit, its feature exist
Include chip IC 1, switch S1 and resistance R2 in, the optical coupling isolation circuit, detection circuit include triode V1, triode V2 and
Triode V3, on-off circuit includes resistance R5 and bidirectional thyristor Q1, and output circuit includes resistance R11 and electric capacity C6, resistance R10
One end connection resistance R11, electric capacity C6 and 220V civil power, the resistance R10 other end connection diode D1 negative electrode and switch S2,
Diode D1 anode connection resistance R1, resistance R1 other end connection electric capacity C1, the other end of electric capacity C2,220V civil power and double
To an IGCT Q1 main electrode, an input of the resistance R11 other end connection electric capacity C6 other end and rectification circuit
End, electric capacity C1 other end connection resistance R3, switch S1 and the pin 3 of chip IC 1, the resistance R3 other end connects two-way brilliant lock
Pipe Q1 control pole, the output end of rectification circuit is connected to LED two ends, and the electric capacity C2 other end connects resistance R4, resistance R4's
Other end connection resistance R5, electric capacity C3, electric capacity C4, electric capacity C5, diode D3 anode, diode D5 anode, load A it is another
One end and unidirectional thyristor Q1 another main electrode, switch the S1 other end connection resistance R2, resistance R2 other end connection
The resistance R5 other end and the pin 4 of chip IC 1, the connecting triode V1 of pin 2 of chip IC 1 colelctor electrode, triode V1's
Emitter stage connecting triode V2 colelctor electrode and resistance R7, the connection resistance of pin 1 R8, resistance R9 and the triode V2 of chip IC 1
Emitter stage, a resistance R9 other end connection potentiometer RP1 fixing end, diode D4 negative electrode, resistance R7 it is another
The negative electrode at end, the electric capacity C5 other end and diode D2, triode V2 base stage connection resistance the R8 other end and triode V3
Colelctor electrode, triode V3 base stage connection potentiometer RP1 sliding end.
2. LED power circuit according to claim 1, it is characterised in that the model 4N25 of the chip IC 1.
3. LED power circuit according to claim 1, it is characterised in that the triode V1 and V3 is the pole of N-type three
Pipe, triode N2 is p-type triode.
4. LED power circuit according to claim 1, it is characterised in that resistance R11 and electric capacity C6 composition the capacitance-resistance drop
Volt circuit.
5. LED power circuit according to claim 1, it is characterised in that the rectification circuit is by 4 IN4001 types two
The full bridge rectifier of pole pipe composition.
6. LED power circuit according to claim 1, it is characterised in that the model of the bidirectional triode thyristor Q1
BT131-600E。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710489754.1A CN107277972A (en) | 2017-06-24 | 2017-06-24 | A kind of LED power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710489754.1A CN107277972A (en) | 2017-06-24 | 2017-06-24 | A kind of LED power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107277972A true CN107277972A (en) | 2017-10-20 |
Family
ID=60068880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710489754.1A Withdrawn CN107277972A (en) | 2017-06-24 | 2017-06-24 | A kind of LED power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107277972A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714859A (en) * | 2019-01-24 | 2019-05-03 | 美智光电科技有限公司 | Intelligent switching control circuit |
-
2017
- 2017-06-24 CN CN201710489754.1A patent/CN107277972A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714859A (en) * | 2019-01-24 | 2019-05-03 | 美智光电科技有限公司 | Intelligent switching control circuit |
| CN109714859B (en) * | 2019-01-24 | 2021-08-10 | 美智光电科技股份有限公司 | Intelligent switch control circuit |
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| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171020 |
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| WW01 | Invention patent application withdrawn after publication |