CN204190999U - Based on the LED drive circuit of bandpass filtering - Google Patents
Based on the LED drive circuit of bandpass filtering Download PDFInfo
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- CN204190999U CN204190999U CN201420635437.8U CN201420635437U CN204190999U CN 204190999 U CN204190999 U CN 204190999U CN 201420635437 U CN201420635437 U CN 201420635437U CN 204190999 U CN204190999 U CN 204190999U
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Abstract
The utility model discloses a kind of LED drive circuit based on bandpass filtering, it is characterized in that: primarily of driving chip U2, the bandwidth-limited circuit be all connected with driving chip U2 and Circuit tuning, and the operational amplification circuit be connected with Circuit tuning output forms; Described bandwidth-limited circuit is by control chip U1, one end is connected with the V2 pin of control chip U1, the other end resistance R2 of ground connection after electric capacity C2 and electric capacity C1 in turn, one end is connected with the tie point of electric capacity C2 with resistance R2, the other end as the resistance R3 of current input terminal, N pole is connected with the V1 pin of control chip U1, P pole forms as the structure such as diode D1 of another input.The utility model can boostfiltering ability greatly, makes the voltage of output more smooth-going, reduces the impact of unnecessary signal on LED, thus extend LED useful life.
Description
Technical field
The utility model relates to a kind of circuit, specifically refers to a kind of LED drive circuit based on bandpass filtering.
Background technology
LED is called as forth generation lighting source or green light source, has the features such as energy-saving and environmental protection, the life-span is long, volume is little, is widely used in the fields such as various instruction, display, decoration, backlight, general lighting and urban landscape.In LED drive circuit, usually have filter function, it exports to LED again after civil power carries the unstable alternating voltage of coming to filter.But the filter function of existing LED drive circuit is thorough not, makes the direct voltage after filtering smooth-going not, thus affects the normal use of LED.
Utility model content
The purpose of this utility model is that the filter function overcoming present LED drive circuit is thorough not, makes the defect that the direct voltage is after filtering smooth-going not, provides a kind of LED drive circuit based on bandpass filtering strengthening filter function.
The purpose of this utility model is achieved through the following technical solutions: based on the LED drive circuit of bandpass filtering, primarily of driving chip U2, the bandwidth-limited circuit be all connected with driving chip U2 and Circuit tuning, and the operational amplification circuit be connected with Circuit tuning output forms, described bandwidth-limited circuit is by control chip U1, one end is connected with the V2 pin of control chip U1, the other end is the resistance R2 of ground connection after electric capacity C2 and electric capacity C1 in turn, one end is connected with the tie point of electric capacity C2 with resistance R2, the other end is as the resistance R3 of current input terminal, N pole is connected with the V1 pin of control chip U1, P pole is as the diode D1 of another input, one end is connected with the GND pin of control chip U1, the resistance R1 that the other end is connected with the tie point of electric capacity C2 with electric capacity C1, and the resistance R4 of the THRES pin and TRIG pin that are serially connected with control chip U1 forms, the OUT1 pin of described control chip U1 is connected with the VCC pin of driving chip U2, and its OUT2 pin is then as circuit output end.
Further, described Circuit tuning comprises diode D2, resistance R5, resistance R6, triode VT1; The base stage of triode VT1 is connected with driving chip VFF pin after diode D2 and resistance R5 through resistance R6 in turn, and its collector electrode is then connected with operational amplification circuit, and its emitter is connected with the FB of driving chip U2; The CT pin of described driving chip U2 is connected with the base stage of triode VT1.
Described operational amplification circuit comprises operational amplifier P1, resistance R7 and resistance R8; One end of resistance R7 is connected with the negative pole of operational amplifier P1, other end ground connection, between the positive pole that resistance R8 is then serially connected with operational amplifier P1 and output stage; The positive pole of described operational amplifier P1 is connected with the collector electrode of triode VT1.
Described control chip U1 is LM110 series.
The utility model comparatively prior art is compared, and has the following advantages and beneficial effect:
(1) the utility model structure is very simple, and cost of manufacture is low.
(2) the utility model arranges bandwidth-limited circuit, and it can boostfiltering ability greatly, makes the voltage of output more smooth-going, reduces the impact of unnecessary signal on LED, thus extend LED useful life.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present utility model.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment
As shown in Figure 1, the LED drive circuit based on bandpass filtering of the present utility model, primarily of driving chip U2, the bandwidth-limited circuit be all connected with driving chip U2 and Circuit tuning, and the operational amplification circuit be connected with Circuit tuning output forms.
Described bandwidth-limited circuit is emphasis place of the present utility model, it is by control chip U1, one end is connected with the V2 pin of control chip U1, the other end is the resistance R2 of ground connection after electric capacity C2 and electric capacity C1 in turn, one end is connected with the tie point of electric capacity C2 with resistance R2, the other end is as the resistance R3 of current input terminal, N pole is connected with the V1 pin of control chip U1, P pole is as the diode D1 of another input, one end is connected with the GND pin of control chip U1, the resistance R1 that the other end is connected with the tie point of electric capacity C2 with electric capacity C1, and the resistance R4 of the THRES pin and TRIG pin that are serially connected with control chip U1 forms, the OUT1 pin of described control chip U1 is connected with the VCC pin of driving chip U2, and its OUT2 pin is then as circuit output end.Bandwidth-limited circuit allows the ripple of special frequency channel to pass through, and shields the ripple of other frequency ranges simultaneously, makes from the voltage of bandwidth-limited circuit output more smooth-going.In order to ensure the effect of the present embodiment, described control chip is preferably LM11 family chip to realize.
Described Circuit tuning comprises diode D2, resistance R5, resistance R6, triode VT1; The base stage of triode VT1 is connected with driving chip VFF pin in turn after resistance R6, diode D2 and resistance R5, and its collector electrode is then connected with operational amplification circuit, and its emitter is connected with the FB pin of driving chip U2.Meanwhile, the CT pin of this driving chip U2 is also connected with the base stage of triode VT1.
Described operational amplification circuit comprises operational amplifier P1, resistance R7 and resistance R8; One end of resistance R7 is connected with the negative pole of operational amplifier P1, its other end ground connection.Between the positive pole that resistance R8 is then serially connected with operational amplifier P1 and output stage.Meanwhile, the positive pole of operational amplifier P1 is also connected with the collector electrode of triode VT1.The power output of circuit can be amplified by the effect of operational amplification circuit, to meet the power demand of LED.
During operation, civil power is input to bandwidth-limited circuit, through the filter action of bandwidth-limited circuit, obtains more smooth-going voltage and is supplied to follow-up peripheral circuit, and the pressure regulation eventually passing amplifying circuit obtains suitable voltage and is supplied to LED.
As mentioned above, just well the utility model can be implemented.
Claims (4)
1. based on the LED drive circuit of bandpass filtering, it is characterized in that: primarily of driving chip U2, the bandwidth-limited circuit be all connected with driving chip U2 and Circuit tuning, and the operational amplification circuit be connected with Circuit tuning output forms, described bandwidth-limited circuit is by control chip U1, one end is connected with the V2 pin of control chip U1, the other end is the resistance R2 of ground connection after electric capacity C2 and electric capacity C1 in turn, one end is connected with the tie point of electric capacity C2 with resistance R2, the other end is as the resistance R3 of current input terminal, N pole is connected with the V1 pin of control chip U1, P pole is as the diode D1 of another input, one end is connected with the GND pin of control chip U1, the resistance R1 that the other end is connected with the tie point of electric capacity C2 with electric capacity C1, and the resistance R4 of the THRES pin and TRIG pin that are serially connected with control chip U1 forms, the OUT1 pin of described control chip U1 is connected with the VCC pin of driving chip U2, and its OUT2 pin is then as circuit output end.
2. the LED drive circuit based on bandpass filtering according to claim 1, is characterized in that: described Circuit tuning comprises diode D2, resistance R5, resistance R6, triode VT1; The base stage of triode VT1 is connected with driving chip VFF pin after diode D2 and resistance R5 through resistance R6 in turn, and its collector electrode is then connected with operational amplification circuit, and its emitter is connected with the FB pin of driving chip U2; The CT pin of described driving chip U2 is connected with the base stage of triode VT1.
3. the LED drive circuit based on bandpass filtering according to claim 2, is characterized in that: described operational amplification circuit comprises operational amplifier P1, resistance R7 and resistance R8; One end of resistance R7 is connected with the negative pole of operational amplifier P1, other end ground connection, between the positive pole that resistance R8 is then serially connected with operational amplifier P1 and output stage; The positive pole of described operational amplifier P1 is connected with the collector electrode of triode VT1.
4. the LED drive circuit based on bandpass filtering according to claim 1, is characterized in that: described control chip U1 is LM110 series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420635437.8U CN204190999U (en) | 2014-10-29 | 2014-10-29 | Based on the LED drive circuit of bandpass filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420635437.8U CN204190999U (en) | 2014-10-29 | 2014-10-29 | Based on the LED drive circuit of bandpass filtering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204190999U true CN204190999U (en) | 2015-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420635437.8U Expired - Fee Related CN204190999U (en) | 2014-10-29 | 2014-10-29 | Based on the LED drive circuit of bandpass filtering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204190999U (en) |
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2014
- 2014-10-29 CN CN201420635437.8U patent/CN204190999U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20151029 |
|
| EXPY | Termination of patent right or utility model |