CN208094834U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
- Publication number
- CN208094834U CN208094834U CN201721552337.9U CN201721552337U CN208094834U CN 208094834 U CN208094834 U CN 208094834U CN 201721552337 U CN201721552337 U CN 201721552337U CN 208094834 U CN208094834 U CN 208094834U
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- Prior art keywords
- led
- circuit
- anodes
- led array
- cathode
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Abstract
The utility model discloses a kind of LED drive circuits, characterized in that including decompression current-limiting circuit, rectification circuit, filter circuit, LED array and varistor R for protecting LED not punctured by instantaneous pressureV；The decompression current-limiting circuit includes resistance R1 and capacitance C1, and the rectification circuit includes rectifier diode VD1, VD2, VD3 and VD4, and the filter circuit includes capacitance C2 and C3, and the LED array includes several LED and several switches K.Advantage：It is simple in structure, with decompression, current limliting, rectification, filter action, and varistor is added in circuit and can be good at solving the problems, such as that voltage increases and impacts or damage component suddenly in circuit, the paralleling switch on LED can quickly find the LED of damage.
Description
Technical field
The utility model is related to a kind of LED drive circuits, belong to driving circuit technical field.
Background technology
When encountering such as thunder and lightning, big electrical equipment startup, meeting voltage instantaneous becomes larger, generation mutation current, and the prior art
In LED drive circuit tend not to effectively discharge mutation current, to being impacted to LED and other transistors
It even destroys, causes damages；Several LED connect 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 in the prior art is more complex, and expense is also relatively high.
Invention content
Technical problem to be solved in the utility model is to overcome the deficiencies of existing technologies, and provides a kind of LED drive circuit.
In order to solve the above technical problems, the utility model provides a kind of LED drive circuit, characterized in that limited including decompression
Current circuit, rectification circuit, filter circuit, LED array and the varistor R for protecting LED not punctured by instantaneous pressureV；
The decompression current-limiting circuit includes resistance R1 and capacitance C1, the rectification circuit include rectifier diode VD1, VD2,
VD3 and VD4, the filter circuit include capacitance C2 and C3, and the LED array includes several LED and several switches K；
The R1 and C1 composes in parallel decompression current-limiting circuit, and described decompression current-limiting circuit one end connects positive pole, another
End is separately connected VD1 anodes and VD2 cathode, and VD1 cathode are separately connected VD3 cathode, the one end C2, the one end C3, varistor RVOne
End and LED array input terminal, VD2 anodes are separately connected VD4 anodes, the C2 other ends, the C3 other ends, varistor RVThe other end
And LED array output end, VD4 cathode and VD3 anodes are separately connected power cathode；
It is serially connected after one switch K of each LED parallel connections in the LED array, a protective resistance is connected after series connection
One end of R2, the other end of R2 is as LED array output end connection VD2 anodes.
Further, the rectifier diode uses the rectifier diode of 1N4007 series.
Further, the pressure resistance of described capacitance C2, C3 are according to depending on load voltage.
Further, depending on capacitance C2, C3 capacity is according to the size of load current.
Further, the pressure resistance is 1.2 times of load voltage.
Further, the switch K LED normal operating conditions in opened condition.
Further, in the LED array concatenated LED quantity depending on its forward conduction voltage.
The advantageous effect that the utility model is reached：
The LED drive circuit structure of the utility model is simple, has decompression, current limliting, rectification, filter action, and in electricity
Varistor is added in road to can be good at solving voltage increase suddenly in circuit and impact or damage asking for component
Topic, the paralleling switch on LED can quickly find the LED of damage.
Description of the drawings
Fig. 1 is the circuit connection diagram of the utility model.
Specific implementation mode
The utility model is further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating this
The technical solution of utility model, and the scope of protection of the utility model cannot be limited with this.
As shown in Figure 1, a kind of LED drive circuit, characterized in that including decompression current-limiting circuit, rectification circuit, filtered electrical
Road, LED array and the varistor R for protecting LED not punctured by instantaneous pressureV；
The decompression current-limiting circuit includes resistance R1 and capacitance C1, the rectification circuit include rectifier diode VD1, VD2,
VD3 and VD4, the filter circuit include capacitance C2 and C3, and the LED array includes several LED and several switches K；
The R1 and C1 composes in parallel decompression current-limiting circuit, and described decompression current-limiting circuit one end connects positive pole, another
End is separately connected VD1 anodes and VD2 cathode, and VD1 cathode are separately connected VD3 cathode, the one end C2, the one end C3, varistor RVOne
End and LED array input terminal, VD2 anodes are separately connected VD4 anodes, the C2 other ends, the C3 other ends, varistor RVThe other end
And LED array output end, VD4 cathode and VD3 anodes are separately connected power cathode；
It is serially connected after one switch K of each LED parallel connections in the LED array, a protective resistance is connected after series connection
One end of R2, the other end of R2 is as LED array output end connection VD2 anodes.
Open the light K in driving circuit normal operating conditions all in opening state, be equivalent to all LED series operations, when
When wherein there are LED damage open circuits, LED can be caused not work all, be controlled, can be sent out by closure to each switch or open
Now damage the LED of open circuit（Such as some LED open circuits, by being closed the switch in parallel with it, being equivalent to keeps the LED short-circuit, and its
His LED is bright just to can prove that the LED is bad）
For the circuit with current major applications circuit the difference is that being connected with varistor, varistor can be in electricity
Press the moment (such as thunder and lightning, big electricity consumption set each start) of mutation that effectively mutation current is released, to protect LED and other
The response time of transistor, transient voltage suppressor is generally nanosecond.
The effect of capacitance C1 is decompression and current limliting in the figure;The effect of VD1~VD4 is rectification, for alternating current is whole
The rectifier 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 resistance of C2, C3 should be depending on load voltages, generally 1.2 times of load voltage,
Depending on the size of its capacitance apparent load electric current.The effect of varistor Rv is by the high voltage pulse pair of moment in input power
Ground is released, to protect LED not punctured by instantaneous pressure.
The concatenated quantity of LED can at most reach 80 depending on its forward conduction voltage (VF) in 220V alternating current circuits
It is a or so.The general peak value required more than input supply voltage of pressure resistance of capacitance can be in the alternating current circuit of 220V/50Hz
Select pressure resistance for the electric capacity of the dacron or paper delivery medium capacitance of 400V or more.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and deformations can also be made, these change
The scope of protection of the utility model is also should be regarded as into deformation.
Claims (3)
1. a kind of LED drive circuit, characterized in that including decompression current-limiting circuit, rectification circuit, filter circuit, LED array and
Varistor R for protecting LED not punctured by instantaneous pressureV；
The decompression current-limiting circuit includes resistance R1 and capacitance C1, and the rectification circuit includes rectifier diode VD1, VD2, VD3
And VD4, the filter circuit include capacitance C2 and C3, the LED array includes several LED and several switches K；
The R1 and C1 composes in parallel decompression current-limiting circuit, and described decompression current-limiting circuit one end connects positive pole, the other end point
Not Lian Jie VD1 anodes and VD2 cathode, VD1 cathode are separately connected VD3 cathode, the one end C2, the one end C3, varistor RVOne end with
And LED array input terminal, VD2 anodes are separately connected VD4 anodes, the C2 other ends, the C3 other ends, varistor RVThe other end and
LED array output end, VD4 cathode and VD3 anodes are separately connected power cathode；
It is serially connected after one switch K of each LED parallel connections in the LED array, one protective resistance R2 of connection after series connection
One end, the other end of R2 is as LED array output end connection VD2 anodes.
2. a kind of LED drive circuit according to claim 1, characterized in that the rectifier diode uses 1N4007 systems
The rectifier diode of row.
3. a kind of LED drive circuit according to claim 1, characterized in that the switch K is in LED normal operating conditions
In opened condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721552337.9U CN208094834U (en) | 2017-11-20 | 2017-11-20 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721552337.9U CN208094834U (en) | 2017-11-20 | 2017-11-20 | A kind of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208094834U true CN208094834U (en) | 2018-11-13 |
Family
ID=64068013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721552337.9U Expired - Fee Related CN208094834U (en) | 2017-11-20 | 2017-11-20 | A kind of LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208094834U (en) |
-
2017
- 2017-11-20 CN CN201721552337.9U patent/CN208094834U/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: 20181113 Termination date: 20191120 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |