CN204335052U - A kind of stable bandpass filtering LED drive system - Google Patents
A kind of stable bandpass filtering LED drive system Download PDFInfo
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- CN204335052U CN204335052U CN201420740072.5U CN201420740072U CN204335052U CN 204335052 U CN204335052 U CN 204335052U CN 201420740072 U CN201420740072 U CN 201420740072U CN 204335052 U CN204335052 U CN 204335052U
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Abstract
The utility model discloses a kind of stable bandpass filtering LED drive system, primarily of bandwidth-limited circuit, Circuit tuning, the operational amplification circuit be connected with Circuit tuning forms, and it is characterized in that: between bandwidth-limited circuit and Circuit tuning, be also connected with linear drive circuit; Described linear drive circuit is by driving chip U, triode VT2, triode VT3, triode VT4, triode VT5, the electric capacity C3 that positive pole is connected with bandwidth-limited circuit, negative pole is connected with the IN1 pin of driving chip U after resistance R9, the compositions such as the resistance R10 that one end is connected with the collector electrode of triode VT5, the other end is connected with the base stage of triode VT3 after resistance R11.The utility model adopts linear drive circuit, and it can make the driveability of LED drive system more stable, thus ensures that LED can work normally.
Description
Technical field
The utility model relates to a kind of system, specifically refers to a kind of stable bandpass filtering LED drive system.
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 driveability of existing LED drive circuit is also unstable, affects the normal use of LED.
Utility model content
The purpose of this utility model is the defect of the driveability instability overcoming present LED drive circuit, provides a kind of stable bandpass filtering LED drive system.
The purpose of this utility model is achieved through the following technical solutions: a kind of stable bandpass filtering LED drive system, primarily of bandwidth-limited circuit, Circuit tuning, the operational amplification circuit be connected with Circuit tuning forms, between bandwidth-limited circuit and Circuit tuning, be also connected with linear drive circuit, described linear drive circuit is by driving chip U, triode VT2, triode VT3, triode VT4, triode VT5, positive pole is connected with bandwidth-limited circuit, the electric capacity C3 that negative pole is connected with the IN1 pin of driving chip U after resistance R9, one end is connected with the collector electrode of triode VT5, the resistance R10 that the other end is connected with the base stage of triode VT3 after resistance R11, positive pole is connected with the base stage of triode VT5, the electric capacity C5 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the electric capacity C4 of minus earth, one end is connected with the emitter of triode VT5, the resistance R13 that the other end is connected with the base stage of triode VT2, one end is connected with the base stage of triode VT2, the resistance R12 that the other end is connected with the base stage of triode VT3, N pole is connected with the collector electrode of triode VT5, the diode D3 that P pole is connected with the collector electrode of triode VT2, positive terminal is connected with the collector electrode of triode VT5, the not gate K that end of oppisite phase is connected with triode VT4 collector electrode, one end is connected with triode VT4 emitter, the resistance R15 that the other end is connected with the emitter of triode VT3 after resistance R14, the end of oppisite phase of P pole NAND gate K is connected, the diode D4 that N pole is connected with the tie point of resistance R14 with resistance R15 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT5, END pin ground connection, OUT pin are connected with the collector electrode of triode VT2, the collector electrode of triode VT2 is also connected with the base stage of triode VT4, its emitter is connected with the base stage of triode VT3, the grounded collector of triode VT3, the N pole of diode D4 is also connected with Circuit tuning.
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 positive pole of electric capacity C3, and its OUT2 pin is then as an output of system.
Described Circuit tuning comprises adjustment chip U2, diode D2, resistance R5, resistance R6, triode VT1; The base stage of triode VT1 is connected with the VFF pin of adjustment chip U2 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 adjustment chip U2; The CT pin of described adjustment chip U2 is connected with the base stage of triode VT1, VCC pin is connected with the N pole of diode D4, GND pin ground connection.
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, its output is then as another output of system.
Described control chip U1 is LM110 series.
Described driving chip U is LM387 integrated chip.
The utility model comparatively prior art is compared, and has the following advantages and beneficial effect:
(1) the utility model adopts linear drive circuit, and it can make the driveability of LED drive system more stable, thus ensures that LED can work normally.
(2) the utility model adopts LM387 chip as driving chip, its highly sensitive, low price.
(3) 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.
Fig. 2 is the structural representation of the utility model linear drive circuit.
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, a kind of stable bandpass filtering LED drive system of the present utility model, primarily of bandwidth-limited circuit, Circuit tuning, the operational amplification circuit be connected with Circuit tuning forms, between bandwidth-limited circuit and Circuit tuning, be also connected with linear drive circuit.
As shown in Figure 2, described linear drive circuit is by driving chip U, triode VT2, triode VT3, triode VT4, triode VT5, positive pole is connected with bandwidth-limited circuit, the electric capacity C3 that negative pole is connected with the IN1 pin of driving chip U after resistance R9, one end is connected with the collector electrode of triode VT5, the resistance R10 that the other end is connected with the base stage of triode VT3 after resistance R11, positive pole is connected with the base stage of triode VT5, the electric capacity C5 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the electric capacity C4 of minus earth, one end is connected with the emitter of triode VT5, the resistance R13 that the other end is connected with the base stage of triode VT2, one end is connected with the base stage of triode VT2, the resistance R12 that the other end is connected with the base stage of triode VT3, N pole is connected with the collector electrode of triode VT5, the diode D3 that P pole is connected with the collector electrode of triode VT2, positive terminal is connected with the collector electrode of triode VT5, the not gate K that end of oppisite phase is connected with triode VT4 collector electrode, one end is connected with triode VT4 emitter, the resistance R15 that the other end is connected with the emitter of triode VT3 after resistance R14, the end of oppisite phase of P pole NAND gate K is connected, the diode D4 that N pole is connected with the tie point of resistance R14 with resistance R15 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT5, END pin ground connection, OUT pin are connected with the collector electrode of triode VT2, the collector electrode of triode VT2 is also connected with the base stage of triode VT4, its emitter is connected with the base stage of triode VT3, the grounded collector of triode VT3, the N pole of diode D4 is also connected with Circuit tuning.Linear drive circuit, can make the driveability of LED drive system more stable, thus ensures that LED can work normally.Meanwhile, described driving chip U elects LM387 integrated chip as, thus makes implementation result better.
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 positive pole of electric capacity C3, and its OUT2 pin is then as an output of system.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 LM110.
Described Circuit tuning comprises adjustment chip U2, diode D2, resistance R5, resistance R6, triode VT1; The base stage of triode VT1 is connected with the VFF pin of adjustment chip U2 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 adjustment chip U2; The CT pin of described adjustment chip U2 is connected with the base stage of triode VT1, VCC pin is connected with the N pole of diode D4, GND pin ground connection.
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, its output is then as another output of system.The power output of circuit can be amplified by the effect of operational amplification circuit, to meet the power demand of LED.
As mentioned above, just well the utility model can be implemented.
Claims (6)
1. a stable bandpass filtering LED drive system, primarily of bandwidth-limited circuit, Circuit tuning, the operational amplification circuit be connected with Circuit tuning forms, and it is characterized in that: between bandwidth-limited circuit and Circuit tuning, be also connected with linear drive circuit, described linear drive circuit is by driving chip U, triode VT2, triode VT3, triode VT4, triode VT5, positive pole is connected with bandwidth-limited circuit, the electric capacity C3 that negative pole is connected with the IN1 pin of driving chip U after resistance R9, one end is connected with the collector electrode of triode VT5, the resistance R10 that the other end is connected with the base stage of triode VT3 after resistance R11, positive pole is connected with the base stage of triode VT5, the electric capacity C5 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the electric capacity C4 of minus earth, one end is connected with the emitter of triode VT5, the resistance R13 that the other end is connected with the base stage of triode VT2, one end is connected with the base stage of triode VT2, the resistance R12 that the other end is connected with the base stage of triode VT3, N pole is connected with the collector electrode of triode VT5, the diode D3 that P pole is connected with the collector electrode of triode VT2, positive terminal is connected with the collector electrode of triode VT5, the not gate K that end of oppisite phase is connected with triode VT4 collector electrode, one end is connected with triode VT4 emitter, the resistance R15 that the other end is connected with the emitter of triode VT3 after resistance R14, the end of oppisite phase of P pole NAND gate K is connected, the diode D4 that N pole is connected with the tie point of resistance R14 with resistance R15 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT5, END pin ground connection, OUT pin are connected with the collector electrode of triode VT2, the collector electrode of triode VT2 is also connected with the base stage of triode VT4, its emitter is connected with the base stage of triode VT3, the grounded collector of triode VT3, the N pole of diode D4 is also connected with Circuit tuning.
2. a kind of stable bandpass filtering LED drive system according to claim 1, it is characterized in that: 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 positive pole of electric capacity C3, and its OUT2 pin is then as an output of system.
3. a kind of stable bandpass filtering LED drive system according to claim 2, is characterized in that: described Circuit tuning comprises adjustment chip U2, diode D2, resistance R5, resistance R6, triode VT1; The base stage of triode VT1 is connected with the VFF pin of adjustment chip U2 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 adjustment chip U2; The CT pin of described adjustment chip U2 is connected with the base stage of triode VT1, VCC pin is connected with the N pole of diode D4, GND pin ground connection.
4. a kind of stable bandpass filtering LED drive system according to claim 3, 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, its output is then as another output of system.
5. a kind of stable bandpass filtering LED drive system according to claim 4, is characterized in that: described control chip U1 is LM110 series.
6. a kind of stable bandpass filtering LED drive system according to any one of Claims 1 to 5, is characterized in that: described driving chip U is LM387 integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420740072.5U CN204335052U (en) | 2014-11-29 | 2014-11-29 | A kind of stable bandpass filtering LED drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420740072.5U CN204335052U (en) | 2014-11-29 | 2014-11-29 | A kind of stable bandpass filtering LED drive system |
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| Publication Number | Publication Date |
|---|---|
| CN204335052U true CN204335052U (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420740072.5U Expired - Fee Related CN204335052U (en) | 2014-11-29 | 2014-11-29 | A kind of stable bandpass filtering LED drive system |
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| Country | Link |
|---|---|
| CN (1) | CN204335052U (en) |
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2014
- 2014-11-29 CN CN201420740072.5U patent/CN204335052U/en not_active Expired - Fee Related
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| 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: 20150513 Termination date: 20151129 |