CN107835545A - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
- Publication number
- CN107835545A CN107835545A CN201711155431.5A CN201711155431A CN107835545A CN 107835545 A CN107835545 A CN 107835545A CN 201711155431 A CN201711155431 A CN 201711155431A CN 107835545 A CN107835545 A CN 107835545A
- Authority
- CN
- China
- Prior art keywords
- led
- drive circuit
- circuit
- resistance
- led array
- 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
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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]
-
- 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]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED drive circuit, it is characterized in that, including decompression current-limiting circuit, rectification circuit, filter circuit, LED array and the piezo-resistance R for protecting LED not punctured by instantaneous pressureV；The decompression current-limiting circuit includes resistance R1 and electric capacity C1, and the rectification circuit includes commutation diode VD1, VD2, VD3 and VD4, and the filter circuit includes electric capacity C2 and C3, and the LED array includes several LED and several switches K.Advantage：It is simple in construction, with decompression, current limliting, rectification, filter action, and add piezo-resistance in circuit and can be good at solving the problems, such as voltage increase suddenly in circuit and impact or damage component, the paralleling switch on LED, it can quickly find the LED damaged.
Description
Technical field
The present invention relates to a kind of LED drive circuit, belongs to drive circuit technical field.
Background technology
When running into such as thunder and lightning, big electrical equipment startup, meeting voltage instantaneous becomes big, generation mutation current, and prior art
In LED drive circuit tend not to effectively discharge mutation current, so as to being impacted to LED and other transistors
Even destroy, cause damage；Some LED are connected in usual LED drive circuit, if one of LED damages are disconnected after series connection
Road, it is pretty troublesome just to find out wherein bad LED, and also LED circuit of the prior art is more complicated, and expense is also higher.
The content of the invention
The technical problems to be solved by the invention are the defects of overcoming prior art, there is provided a kind of LED drive circuit.
In order to solve the above technical problems, the present invention provides a kind of LED drive circuit, it is characterized in that, including decompression current limliting electricity
Road, rectification circuit, filter circuit, LED array and the piezo-resistance R for protecting LED not punctured by instantaneous pressureV；
The decompression current-limiting circuit includes resistance R1 and electric capacity C1, and the rectification circuit includes commutation diode VD1, VD2, VD3
And VD4, the filter circuit include electric capacity C2 and C3, the LED array includes several LED and several switches K；
The R1 and C1 compose in parallel decompression current-limiting circuit, decompression current-limiting circuit one end connection positive source, the other end point
Not Lian Jie VD1 positive poles and VD2 negative poles, VD1 negative poles connect VD3 negative poles, C2 one end, C3 one end, piezo-resistance R respectivelyVOne end with
And LED array input, VD2 positive poles connect VD4 positive poles, the C2 other ends, the C3 other ends, piezo-resistance R respectivelyVThe other end and
LED array output end, VD4 negative poles and VD3 positive poles connect power cathode respectively；
It is serially connected after each LED switch K in parallel in the LED array, one protective resistance R2 of connection after series connection
One end, the R2 other end connect VD2 positive poles as LED array output end.
Further, the commutation diode is using commutation diode serial 1N4007.
Further, described electric capacity C2, C3's is pressure-resistant according to depending on load voltage.
Further, depending on electric capacity C2, C3 capacity is according to the size of load current.
Further, it is described it is pressure-resistant be 1.2 times of load voltage.
Further, the switch K in LED normal operating conditions in opened condition.
Further, the LED quantity connected in the LED array is depending on its forward conduction voltage.
The beneficial effect that the present invention is reached：
The LED drive circuit structure of the present invention is simple, has decompression, current limliting, rectification, filter action, and add in circuit
Piezo-resistance can be good at solving the problems, such as voltage increase suddenly in circuit and impact or damage component, in LED
Upper paralleling switch, it can quickly find the LED of damage.
Brief description of the drawings
Fig. 1 is the circuit connection diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, a kind of LED drive circuit, it is characterized in that, including decompression current-limiting circuit, rectification circuit, filtered electrical
Road, LED array and the piezo-resistance R for protecting LED not punctured by instantaneous pressureV；
The decompression current-limiting circuit includes resistance R1 and electric capacity C1, and the rectification circuit includes commutation diode VD1, VD2, VD3
And VD4, the filter circuit include electric capacity C2 and C3, the LED array includes several LED and several switches K；
The R1 and C1 compose in parallel decompression current-limiting circuit, decompression current-limiting circuit one end connection positive source, the other end point
Not Lian Jie VD1 positive poles and VD2 negative poles, VD1 negative poles connect VD3 negative poles, C2 one end, C3 one end, piezo-resistance R respectivelyVOne end with
And LED array input, VD2 positive poles connect VD4 positive poles, the C2 other ends, the C3 other ends, piezo-resistance R respectivelyVThe other end and
LED array output end, VD4 negative poles and VD3 positive poles connect power cathode respectively；
It is serially connected after each LED switch K in parallel in the LED array, one protective resistance R2 of connection after series connection
One end, the R2 other end connect VD2 positive poles as LED array output end.
Open the light K in drive circuit normal operating conditions all in open mode, equivalent to all LED strip through transport rows, when
When wherein there are LED damages breaking, LED can be caused not work all, by the closure to each switch or open control, can just send out
Now damage the LED of open circuit（Such as some LED open circuits, it is short-circuit equivalent to the LED is made by closing the switch in parallel with it, and its
His LED is bright just to can prove that the LED is bad）
The difference of the circuit and current major applications circuit is to be connected with piezo-resistance, and piezo-resistance can dash forward in voltage
The moment (such as thunder and lightning, big electricity consumption set each start) of change effectively releases mutation current, so as to protect LED and other crystal
Pipe, the response time of transient voltage suppressor are generally nanosecond.
In figure, electric capacity C1 effect is decompression and current limliting;VD1~VD4 effect is rectification, for alternating current is whole
The commutation diode of 1N4007 series may be selected in VD1~VD4.C2, C3's act as filtering, for the pulsation after rectification is straight
Voltage filter is flowed into stable DC voltage.The pressure-resistant of C2, C3 should be depending on load voltage, generally 1.2 times of load voltage,
Depending on the size of its capacitance apparent load electric current.Piezo-resistance Rv effect is by the high voltage pulse pair of moment in input power
Ground is released, so as to protect LED not punctured by instantaneous pressure.
The quantity of LED strip connection can at most reach 80 depending on its forward conduction voltage (VF) in 220V alternating current circuits
It is individual or so.The pressure-resistant general peak value required more than input supply voltage of electric capacity, can be with 220V/50Hz alternating current circuit
Select the pressure-resistant electric capacity of the dacron for more than 400V or paper delivery medium electric capacity.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of LED drive circuit, it is characterized in that, including decompression current-limiting circuit, rectification circuit, filter circuit, LED array and
For the piezo-resistance R for protecting LED not punctured by instantaneous pressureV；
The decompression current-limiting circuit includes resistance R1 and electric capacity C1, and the rectification circuit includes commutation diode VD1, VD2, VD3
And VD4, the filter circuit include electric capacity C2 and C3, the LED array includes several LED and several switches K；
The R1 and C1 compose in parallel decompression current-limiting circuit, decompression current-limiting circuit one end connection positive source, the other end point
Not Lian Jie VD1 positive poles and VD2 negative poles, VD1 negative poles connect VD3 negative poles, C2 one end, C3 one end, piezo-resistance R respectivelyVOne end with
And LED array input, VD2 positive poles connect VD4 positive poles, the C2 other ends, the C3 other ends, piezo-resistance R respectivelyVThe other end and
LED array output end, VD4 negative poles and VD3 positive poles connect power cathode respectively；
It is serially connected after each LED switch K in parallel in the LED array, one protective resistance R2 of connection after series connection
One end, the R2 other end connect VD2 positive poles as LED array output end.
2. a kind of LED drive circuit according to claim 1, it is characterized in that, the commutation diode uses 1N4007 systems
The commutation diode of row.
3. a kind of LED drive circuit according to claim 1, it is characterized in that, described electric capacity C2, C3's is pressure-resistant according to load
Depending on voltage.
4. a kind of LED drive circuit according to claim 1, it is characterized in that, electric capacity C2, C3 capacity is according to load electricity
Depending on the size of stream.
5. a kind of LED drive circuit according to claim 3, it is characterized in that, it is described it is pressure-resistant be 1.2 times of load voltage.
6. a kind of LED drive circuit according to claim 1, it is characterized in that, the switch K is in LED normal operating conditions
In opened condition.
7. a kind of LED drive circuit according to claim 1, it is characterized in that, the LED quantity connected in the LED array
Depending on its forward conduction voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711155431.5A CN107835545A (en) | 2017-11-20 | 2017-11-20 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711155431.5A CN107835545A (en) | 2017-11-20 | 2017-11-20 | A kind of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107835545A true CN107835545A (en) | 2018-03-23 |
Family
ID=61652080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711155431.5A Withdrawn CN107835545A (en) | 2017-11-20 | 2017-11-20 | A kind of LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107835545A (en) |
-
2017
- 2017-11-20 CN CN201711155431.5A patent/CN107835545A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180323 |