CN104968091A - Band-pass filtering LED driving system based on non-isolated output voltage reduction - Google Patents
Band-pass filtering LED driving system based on non-isolated output voltage reduction Download PDFInfo
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- CN104968091A CN104968091A CN201510325195.1A CN201510325195A CN104968091A CN 104968091 A CN104968091 A CN 104968091A CN 201510325195 A CN201510325195 A CN 201510325195A CN 104968091 A CN104968091 A CN 104968091A
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Abstract
The present invention discloses a band-pass filtering LED driving system based on non-isolated output voltage reduction, consisting of a band-pass filtering circuit, an adjusting circuit, an operation amplification circuit connected with the adjusting circuit, and a linear drive circuit connected between the band-pass filtering circuit and the adjusting circuit. The band-pass filtering LED driving system is characterized in that: one output end of the band-pass filtering circuit is also provided with a non-isolated output voltage reduction circuit; the non-isolated output voltage reduction circuit consists of a voltage reduction chip U3, a triode VT6, a triode VT7, a diode D9 of which a P electrode is connected with a VCC pin of the voltage reduction chip U3 after passing a resistor R18 and a resistor R22 in order, and an N electrode is connected with the band-pass filtering circuit, etc. The band-pass filtering LED driving system of the present invention can have a more stable driving performance by adopting the non-isolated output voltage reduction circuit, thereby ensuring that an LED lamp can normally operate.
Description
Technical field
The present invention relates to a kind of system, specifically refer to a kind of bandpass filtering LED drive system based on non-isolated output buck.
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.
Summary of the invention
The object of the invention is to the defect of the driveability instability overcoming present LED drive circuit, a kind of bandpass filtering LED drive system based on non-isolated output buck is provided.
Object of the present invention is achieved through the following technical solutions: a kind of bandpass filtering LED drive system based on non-isolated output buck, by bandwidth-limited circuit, Circuit tuning, the operational amplification circuit be connected with Circuit tuning, be serially connected in the linear drive circuit between bandwidth-limited circuit and Circuit tuning, and the non-isolated output buck circuit of the output being arranged on bandwidth-limited circuit forms.Described non-isolated output buck circuit is by step-down chip U3, triode VT6, and triode VT7, P pole is in turn through resistance R18, be connected with the VCC pin of step-down chip U3 after resistance R22, the diode D9 that N pole is connected with bandwidth-limited circuit, positive pole is connected with the N pole of diode D9 after resistance R16, negative pole is in turn through resistance R17, resistance R20, polar capacitor C9, the polar capacitor C7 be connected with the CS pin of step-down chip U3 after resistance R19, P pole is in turn through polar capacitor C8, be connected with the tie point of resistance R22 with resistance R18 after resistance R21, the diode D5 that N pole is connected with the collector electrode of triode VT7 through polar capacitor C9, P pole is connected with the emitter of triode VT6, N pole is then as the voltage stabilizing didoe D8 of an output of system, and N pole is in turn through resistance R24, be connected with the tie point of polar capacitor C8 with resistance R21 after resistance R23, P pole is in turn through the collector electrode of triode VT5 and the tie point of polar capacitor C9, the diode D6 be connected with the N pole of voltage stabilizing didoe D8 after resistance R32, positive pole is connected with the FB pin of step-down chip U3 after resistance R27, the polar capacitor C6 that negative pole is connected with the base stage of triode VT6, P pole is connected with the emitter of triode VT7, the diode D7 of ground connection after N pole is connected with the GND pin of step-down chip U3 after resistance R25, and one end is connected with the OUT pin of step-down chip U3, the adjustable resistance R26 that the other end is connected with the base stage of triode VT6 forms, grounded collector, the base stage of described triode VT6 are also connected with the tie point of resistance R20 with resistance R17.
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 polar capacitor 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 polar capacitor 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 polar capacitor 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, and 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 polar capacitor C2 and polar capacitor C1 in turn, one end is connected with the tie point of polar capacitor 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 polar capacitor C2 with polar capacitor 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 polar capacitor C3, and its OUT2 pin is then connected with the N pole of diode D9.
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 adjustment chip U2 is D803 integrated chip.
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.
For guaranteeing result of use, described control chip U1 is LM110 integrated chip, and described driving chip U is LM387 integrated chip, and step-down chip U3 is then AP3766 integrated chip.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention is provided with non-isolated output buck circuit, and reduce system power dissipation, improve efficiency, this circuit has efficient output performance, effectively improves the stability of LED drive system.
(2) the present invention adopts linear drive circuit, and it can make the driveability of LED drive system more stable, thus ensures that LED can work normally.
(3) the present invention adopts LM387 chip as driving chip, its highly sensitive, low price.
(4) the present invention 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 invention.
Fig. 2 is the structural representation of linear drive circuit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, the present invention by bandwidth-limited circuit, Circuit tuning, the operational amplification circuit be connected with Circuit tuning, be serially connected in the linear drive circuit between bandwidth-limited circuit and Circuit tuning, and the non-isolated output buck circuit of the output being arranged on bandwidth-limited circuit forms.
Described non-isolated output buck circuit is by step-down chip U3, triode VT6, triode VT7, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, polar capacitor C6, polar capacitor C7, polar capacitor C8, polar capacitor C9, polar capacitor C10, diode D5, diode D6, diode D7, diode D8, and diode D9 forms.
During connection, the P pole of diode D9 is connected with the VCC pin of step-down chip U3 in turn after resistance R18, resistance R22, N pole is connected with bandwidth-limited circuit.The positive pole of polar capacitor C7 is connected with the N pole of diode D9 after resistance R16, negative pole is connected with the CS pin of step-down chip U3 in turn after resistance R17, resistance R20, polar capacitor C9, resistance R19.
Wherein, the P pole of diode D5 is connected with the tie point of resistance R22 with resistance R18 in turn after polar capacitor C8, resistance R21, N pole is connected with the collector electrode of triode VT7 through polar capacitor C9.The P pole of voltage stabilizing didoe D8 is connected with the emitter of triode VT6, N pole is then as an output of system.The N pole of diode D6 is connected with the tie point of polar capacitor C8 with resistance R21 in turn after resistance R24, resistance R23, P pole is connected with the N pole of voltage stabilizing didoe D8 in turn after the tie point of the collector electrode of triode VT5 and polar capacitor C9, resistance R32.
The positive pole of polar capacitor C6 is connected with the FB pin of step-down chip U3 after resistance R27, negative pole is connected with the base stage of triode VT6.Ground connection after the P pole of diode D7 is connected with the emitter of triode VT7, N pole is connected with the GND pin of step-down chip U3 after resistance R25.One end of adjustable resistance R26 is connected with the OUT pin of step-down chip U3, the other end is connected with the base stage of triode VT6.
Grounded collector, the base stage of described triode VT6 are also connected with the tie point of resistance R20 with resistance R17.
For better implementing the present invention, described step-down chip U3 employs AP3766 integrated chip, this chip input ac voltage wide ranges, the effective control voltage regulation of energy and load regulation within the scope of AC60 ~ 300V; It also has frequency jitter and dynamic self-powered, short circuit autoboot, current limliting, overheated, restriction Duty function, just effectively raise the driveability of LED drive system.
As shown in Figure 2, described linear drive circuit by driving chip U, triode VT2, triode VT3, triode VT4, triode VT5, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, polar capacitor C3, polar capacitor C4, polar capacitor C5, diode D3, diode D4, and not gate K forms.
During enforcement, the positive pole of polar capacitor C3 is connected with bandwidth-limited circuit, negative pole is connected with the IN1 pin of driving chip U after resistance R9.One end of resistance R10 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 positive pole of polar capacitor C5 is connected with the base stage of triode VT5, negative pole is connected with the IN1 pin of driving chip U.
Wherein, the positive pole of polar capacitor C4 be connected with the IN2 pin of driving chip U, minus earth.One end of resistance R13 is connected with the emitter of triode VT5, the other end is connected with the base stage of triode VT2.One end of resistance R12 is connected with the base stage of triode VT2, the other end is connected with the base stage of triode VT3.The N pole of diode D3 is connected with the collector electrode of triode VT5, P pole is connected with the collector electrode of triode VT2.
The positive terminal of not gate K is connected with the collector electrode of triode VT5, end of oppisite phase is connected with triode VT4 collector electrode.One end of resistance R15 is connected with triode VT4 emitter, the other end is connected with the emitter of triode VT3 after resistance R14.The end of oppisite phase of the P pole NAND gate K of diode D4 is connected, N pole is connected with the tie point of resistance R14 with resistance R15.
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 of the present invention, can make the driveability of LED drive system more stable, thus ensures that LED can work normally.
During the invention process, the driving chip U of use 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 polar capacitor C2 and polar capacitor C1 in turn, one end is connected with the tie point of polar capacitor 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 polar capacitor C2 with polar capacitor 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 polar capacitor C3, and its OUT2 pin is then connected with the N pole of diode D9.
In order to ensure the effect of the present embodiment, described control chip U1 is LM110 integrated chip.
Described Circuit tuning by adjusting chip U2, diode D2, resistance R5, resistance R6, and triode VT1 forms.
During connection, 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.
For better implementing the present invention, described adjustment chip U2 is D803 integrated chip.
Described operational amplification circuit is by operational amplifier P1, and resistance R7 and resistance R8 forms.
During enforcement, 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.
As mentioned above, just well the present invention can be implemented.
Claims (6)
1. based on a bandpass filtering LED drive system for non-isolated output buck, by bandwidth-limited circuit, Circuit tuning, the operational amplification circuit be connected with Circuit tuning, and be serially connected in the linear drive circuit composition between bandwidth-limited circuit and Circuit tuning, it is characterized in that: be also provided with non-isolated output buck circuit at an output of bandwidth-limited circuit, described non-isolated output buck circuit is by step-down chip U3, triode VT6, and triode VT7, P pole is in turn through resistance R18, be connected with the VCC pin of step-down chip U3 after resistance R22, the diode D9 that N pole is connected with bandwidth-limited circuit, positive pole is connected with the N pole of diode D9 after resistance R16, negative pole is in turn through resistance R17, resistance R20, polar capacitor C9, the polar capacitor C7 be connected with the CS pin of step-down chip U3 after resistance R19, P pole is in turn through polar capacitor C8, be connected with the tie point of resistance R22 with resistance R18 after resistance R21, the diode D5 that N pole is connected with the collector electrode of triode VT7 through polar capacitor C9, P pole is connected with the emitter of triode VT6, N pole is then as the voltage stabilizing didoe D8 of an output of system, and N pole is in turn through resistance R24, be connected with the tie point of polar capacitor C8 with resistance R21 after resistance R23, P pole is in turn through the collector electrode of triode VT5 and the tie point of polar capacitor C9, the diode D6 be connected with the N pole of voltage stabilizing didoe D8 after resistance R32, positive pole is connected with the FB pin of step-down chip U3 after resistance R27, the polar capacitor C6 that negative pole is connected with the base stage of triode VT6, P pole is connected with the emitter of triode VT7, the diode D7 of ground connection after N pole is connected with the GND pin of step-down chip U3 after resistance R25, and one end is connected with the OUT pin of step-down chip U3, the adjustable resistance R26 that the other end is connected with the base stage of triode VT6 forms, grounded collector, the base stage of described triode VT6 are also connected with the tie point of resistance R20 with resistance R17,
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 polar capacitor 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 polar capacitor 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 polar capacitor 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, and 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 bandpass filtering LED drive system based on non-isolated output buck 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 polar capacitor C2 and polar capacitor C1 in turn, one end is connected with the tie point of polar capacitor 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 polar capacitor C2 with polar capacitor 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 polar capacitor C3, and its OUT2 pin is then connected with the N pole of diode D9.
3. a kind of bandpass filtering LED drive system based on non-isolated output buck 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; Described adjustment chip U2 is D803 integrated chip.
4. a kind of bandpass filtering LED drive system based on non-isolated output buck 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 bandpass filtering LED drive system based on non-isolated output buck according to claim 4, is characterized in that: described control chip U1 is LM110 integrated chip.
6. a kind of bandpass filtering LED drive system based on non-isolated output buck according to any one of Claims 1 to 5, is characterized in that: described driving chip U is LM387 integrated chip; Described step-down chip U3 is AP3766 integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510325195.1A CN104968091A (en) | 2014-11-29 | 2015-06-14 | Band-pass filtering LED driving system based on non-isolated output voltage reduction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715023.0A CN104470123A (en) | 2014-11-29 | 2014-11-29 | Stable band-pass filtering LED drive system |
| CN2014107150230 | 2014-11-29 | ||
| CN201510325195.1A CN104968091A (en) | 2014-11-29 | 2015-06-14 | Band-pass filtering LED driving system based on non-isolated output voltage reduction |
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| CN104968091A true CN104968091A (en) | 2015-10-07 |
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| CN201410715023.0A Pending CN104470123A (en) | 2014-11-29 | 2014-11-29 | Stable band-pass filtering LED drive system |
| CN201510325195.1A Pending CN104968091A (en) | 2014-11-29 | 2015-06-14 | Band-pass filtering LED driving system based on non-isolated output voltage reduction |
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| CN201410715023.0A Pending CN104470123A (en) | 2014-11-29 | 2014-11-29 | Stable band-pass filtering LED drive system |
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