CN104967427A - Wideband filtering system based on non-isolated output voltage reduction - Google Patents
Wideband filtering system based on non-isolated output voltage reduction Download PDFInfo
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- CN104967427A CN104967427A CN201510325048.4A CN201510325048A CN104967427A CN 104967427 A CN104967427 A CN 104967427A CN 201510325048 A CN201510325048 A CN 201510325048A CN 104967427 A CN104967427 A CN 104967427A
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Abstract
The present invention discloses a wideband filtering system based on non-isolated output voltage reduction, consisting of a frequency modulation circuit, a fine adjustment circuit and a feedback circuit which are both connected with the frequency modulation circuit, and a linear drive circuit which is connected with the frequency modulation circuit, the fine adjustment circuit and the feedback circuit. The wideband filtering system is characterized in that: a non-isolated output voltage reduction circuit is also provided between the linear drive circuit and the feedback circuit; the non-isolated output voltage reduction circuit consists of a voltage reduction chip U1, a triode VT5, a triode VT6, a diode D7 of which a P electrode is connected with a VCC pin of the voltage reduction chip U1 after passing a resistor R18 and a resistor R22 in order, and an N electrode is connected with the linear drive circuit, etc. The wideband filtering system of the present invention reduces system power consumption and improves efficiency by providing the non-isolated output voltage reduction circuit; in addition, the non-isolated output voltage reduction circuit has high-efficiency output performance, and enables the filtering system to be more stable when processing a wideband signal.
Description
Technical field
The present invention relates to a kind of electronic device, specifically refer to a kind of wideband filtering system based on non-isolated output buck.
Background technology
Along with the development of electronic market, filtering system is also more and more widely used the system that signal plays process effect as a kind of, such as, all need to use filtering system in fields such as medical treatment, industrial production.But at present the filtering system of commercial type stability bad when processing broadband signal, which greatly limits the working range of filtering system.The problems referred to above how are avoided to be then that people are badly in need of solving.
Summary of the invention
The object of the invention is to overcome the existing filtering system defect that stability is bad when processing broadband signal, a kind of wideband filtering system based on non-isolated output buck is provided.
Object of the present invention is achieved through the following technical solutions: a kind of wideband filtering system based on non-isolated output buck, by FM circuit, the trimming circuit be all connected with FM circuit and feedback circuit, the linear drive circuit be connected respectively with FM circuit, trimming circuit and feedback circuit, and between linear drive circuit and feedback circuit, be also provided with non-isolated output buck circuit composition, described non-isolated output buck circuit is by step-down chip U1, triode VT5, and triode VT6, P pole is in turn through resistance R18, be connected with the VCC pin of step-down chip U1 after resistance R22, the diode D7 that N pole is connected with linear drive circuit, positive pole is connected with the N pole of diode D7 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 U1 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 D3 that N pole is connected with the collector electrode of triode VT5 through polar capacitor C9, P pole is connected with the emitter of triode VT6, the voltage stabilizing didoe D6 that N pole is connected with feedback circuit, 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 D4 be connected with the N pole of voltage stabilizing didoe D6 after resistance R32, positive pole is connected with the FB pin of step-down chip U1 after resistance R27, the polar capacitor C11 that negative pole is connected with the base stage of triode VT6, P pole is connected with the emitter of triode VT5, the diode D5 of ground connection after N pole is connected with the GND pin of step-down chip U1 after resistance R25, and one end is connected with the OUT pin of step-down chip U1, 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 VT1, triode VT2, triode VT3, triode VT4, positive pole is connected with FM circuit, the polar capacitor C4 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 VT1, 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 VT1, the polar capacitor C6 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 C5 of minus earth, one end is connected with the emitter of triode VT1, 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 VT1, the diode D1 that P pole is connected with the collector electrode of triode VT2, positive terminal is connected with the collector electrode of triode VT1, 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 D2 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 VT1, 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 man VT3, the grounded collector of triode VT3, the N pole of diode D2 is connected with trimming circuit and feedback circuit simultaneously, the positive pole of described electric capacity C4 is also connected with the N pole of diode D7.
Described FM circuit is by resistance R1, and resistance R2, resistance R3, polar capacitor C1, polar capacitor C2, polar capacitor C3 and potentiometer R4 form; The positive pole of polar capacitor C1 is connected with its negative pole in turn after resistance R1, resistance R2, potentiometer R4 and polar capacitor C3, resistance R3 and potentiometer R4 is in parallel, and the positive pole of polar capacitor C2 is connected with the tie point of resistance R2 with resistance R1, negative pole is then connected with the positive pole of electric capacity C4; The control end of described potentiometer R4 is connected with the negative pole of polar capacitor C3, and the negative pole of polar capacitor C3 is also connected with feedback circuit, its positive pole is then connected with trimming circuit.
Described trimming circuit comprises resistance R7, potentiometer R8; One end of resistance R7 is connected with the negative pole of polar capacitor C1, the other end is then connected with the N pole of diode D2 after potentiometer R8, and the control end of potentiometer R8 is connected with the N pole of diode D2.
Described feedback circuit by operational amplifier P1, operational amplifier P2, one end is connected with the output stage of operational amplifier P2, other end resistance R5 of ground connection after potentiometer R6 forms; The negative pole of described amplifier P2 is connected with its output stage, positive pole is then connected with the tie point of potentiometer R4 with polar capacitor C3, and the output stage of amplifier P1 is extremely connected with the N of diode D2, negative pole is connected with its output stage, positive pole is then connected with the control end of potentiometer R6; The positive pole of described amplifier P2 is also connected with the N pole of diode D6.
For guaranteeing result of use, described driving chip U is LM387 integrated chip, and step-down chip U1 is 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 filtering system.
(2) the present invention is provided with linear drive circuit, and it can make filtering system more stable when processing broadband signal.
(3) the present invention is provided with FM circuit, then can be changed the scope of filtering system process frequency by the polar capacitor C2 in Circuit tuning and polar capacitor C3, thus realizes the wideband process of filtering system, is applicable to close kind of a different occasion.
(4) the present invention adopts LM387 chip as driving chip, its highly sensitive, low price.
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.
Fig. 3 is the structural representation of non-isolated output buck 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 is by FM circuit, the trimming circuit be all connected with FM circuit and feedback circuit, the linear drive circuit be connected respectively with FM circuit, trimming circuit and feedback circuit, and between linear drive circuit and feedback circuit, be also provided with non-isolated output buck circuit composition.
Described non-isolated output buck circuit as shown in Figure 3, by step-down chip U1, triode VT56, triode VT6, 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 C7, polar capacitor C8, polar capacitor C9, polar capacitor C10, polar capacitor C11, diode D3, diode D4, diode D5, diode D6, and diode D7 forms.
During connection, the P pole of diode D7 is connected with the VCC pin of step-down chip U1 in turn after resistance R18, resistance R22, N pole is connected with linear drive circuit.The positive pole of polar capacitor C7 is connected with the N pole of diode D7 after resistance R16, negative pole is connected with the CS pin of step-down chip U1 in turn after resistance R17, resistance R20, polar capacitor C9, resistance R19.
Wherein, the P pole of diode D3 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 VT5 through polar capacitor C9.The P pole of voltage stabilizing didoe D6 is connected with the emitter of triode VT6, N pole is connected with feedback circuit.The N pole of diode D4 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 D6 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 C11 is connected with the FB pin of step-down chip U1 after resistance R27, negative pole is connected with the base stage of triode VT6.Ground connection after the P pole of diode D5 is connected with the emitter of triode VT5, N pole is connected with the GND pin of step-down chip U1 after resistance R25.And one end of adjustable resistance R26 is connected with the OUT pin of step-down chip U1, 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 U1 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 service behaviour of filtering system.
As shown in Figure 2, described linear drive circuit is by driving chip U, triode VT1, triode VT2, triode VT3, triode VT4, positive pole is connected with FM circuit, the polar capacitor C4 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 VT1, 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 VT1, the polar capacitor C6 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 C5 of minus earth, one end is connected with the emitter of triode VT1, 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 VT1, the diode D1 that P pole is connected with the collector electrode of triode VT2, positive terminal is connected with the collector electrode of triode VT1, 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 D2 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 VT1, 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 man VT3, the grounded collector of triode VT3, the N pole of diode D2 is connected with trimming circuit and feedback circuit simultaneously.
The positive pole of described electric capacity C4 is also connected with the N pole of diode D7.
Linear drive circuit of the present invention, it can make filtering system more stable when processing broadband signal.
In order to ensure implementation result, described driving chip U is preferably LM387 integrated chip, its highly sensitive and low price.
The scope of filtering system process frequency can be changed by this FM circuit.It is by resistance R1, resistance R2, resistance R3, polar capacitor C1, polar capacitor C2, and polar capacitor C3 and potentiometer R4 forms.
During enforcement, the positive pole of polar capacitor C1 is connected with its negative pole in turn after resistance R1, resistance R2, potentiometer R4 and polar capacitor C3, resistance R3 and potentiometer R4 is in parallel, and the positive pole of polar capacitor C2 is connected with the tie point of resistance R2 with resistance R1, negative pole is then connected with the positive pole of electric capacity C4.
The control end of described potentiometer R4 is connected with the negative pole of polar capacitor C3, and the negative pole of polar capacitor C3 is also connected with feedback circuit, its positive pole is then connected with trimming circuit.
During work, as long as the polar capacitor amount of adjustment polar capacitor C2 and polar capacitor C3 just can realize the filter range changing filtering system.
During connection, one end of resistance R7 is connected with the negative pole of polar capacitor C1, the other end is then connected with the N pole of diode D2 after potentiometer R8, and the control end of potentiometer R8 is connected with the N pole of diode D2.
Described feedback circuit is by operational amplifier P1, and operational amplifier P2, one end is connected with the output stage of operational amplifier P2, other end resistance R5 of ground connection after potentiometer R6 forms.
The negative pole of described amplifier P2 is connected with its output stage, positive pole is then connected with the tie point of potentiometer R4 with polar capacitor C3, and the output stage of amplifier P1 is extremely connected with the N of diode D2, negative pole is connected with its output stage, positive pole is then connected with the control end of potentiometer R6.
The positive pole of described amplifier P2 is also connected with the N pole of diode D6.
As mentioned above, just well the present invention can be implemented.
Claims (5)
1. the wideband filtering system based on non-isolated output buck, by FM circuit, the trimming circuit be all connected with FM circuit and feedback circuit, and form with the linear drive circuit that FM circuit, trimming circuit and feedback circuit are connected respectively, it is characterized in that: between linear drive circuit and feedback circuit, be also provided with non-isolated output buck circuit, described non-isolated output buck circuit is by step-down chip U1, triode VT5, and triode VT6, P pole is in turn through resistance R18, be connected with the VCC pin of step-down chip U1 after resistance R22, the diode D7 that N pole is connected with linear drive circuit, positive pole is connected with the N pole of diode D7 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 U1 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 D3 that N pole is connected with the collector electrode of triode VT5 through polar capacitor C9, P pole is connected with the emitter of triode VT6, the voltage stabilizing didoe D6 that N pole is connected with feedback circuit, 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 D4 be connected with the N pole of voltage stabilizing didoe D6 after resistance R32, positive pole is connected with the FB pin of step-down chip U1 after resistance R27, the polar capacitor C11 that negative pole is connected with the base stage of triode VT6, P pole is connected with the emitter of triode VT5, the diode D5 of ground connection after N pole is connected with the GND pin of step-down chip U1 after resistance R25, and one end is connected with the OUT pin of step-down chip U1, 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 VT1, triode VT2, triode VT3, triode VT4, positive pole is connected with FM circuit, the polar capacitor C4 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 VT1, 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 VT1, the polar capacitor C6 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 C5 of minus earth, one end is connected with the emitter of triode VT1, 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 VT1, the diode D1 that P pole is connected with the collector electrode of triode VT2, positive terminal is connected with the collector electrode of triode VT1, 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 D2 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 VT1, 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 man VT3, the grounded collector of triode VT3, the N pole of diode D2 is connected with trimming circuit and feedback circuit simultaneously, the positive pole of described electric capacity C4 is also connected with the N pole of diode D7.
2. a kind of wideband filtering system based on non-isolated output buck according to claim 1, is characterized in that: described FM circuit is by resistance R1, and resistance R2, resistance R3, polar capacitor C1, polar capacitor C2, polar capacitor C3 and potentiometer R4 form; The positive pole of polar capacitor C1 is connected with its negative pole in turn after resistance R1, resistance R2, potentiometer R4 and polar capacitor C3, resistance R3 and potentiometer R4 is in parallel, and the positive pole of polar capacitor C2 is connected with the tie point of resistance R2 with resistance R1, negative pole is then connected with the positive pole of electric capacity C4; The control end of described potentiometer R4 is connected with the negative pole of polar capacitor C3, and the negative pole of polar capacitor C3 is also connected with feedback circuit, its positive pole is then connected with trimming circuit.
3. a kind of wideband filtering system based on non-isolated output buck according to claim 2, is characterized in that: described trimming circuit comprises resistance R7, potentiometer R8; One end of resistance R7 is connected with the negative pole of polar capacitor C1, the other end is then connected with the N pole of diode D2 after potentiometer R8, and the control end of potentiometer R8 is connected with the N pole of diode D2.
4. a kind of wideband filtering system based on non-isolated output buck according to claim 3, it is characterized in that: described feedback circuit is by operational amplifier P1, operational amplifier P2, one end is connected with the output stage of operational amplifier P2, other end resistance R5 of ground connection after potentiometer R6 forms; The negative pole of described amplifier P2 is connected with its output stage, positive pole is then connected with the tie point of potentiometer R4 with polar capacitor C3, and the output stage of amplifier P1 is extremely connected with the N of diode D2, negative pole is connected with its output stage, positive pole is then connected with the control end of potentiometer R6; The positive pole of described amplifier P2 is also connected with the N pole of diode D6.
5. a kind of wideband filtering system based on non-isolated output buck according to any one of Claims 1 to 4, is characterized in that: described driving chip U is LM387 integrated chip; Described step-down chip U1 is AP3766 integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510325048.4A CN104967427A (en) | 2014-11-29 | 2015-06-14 | Wideband filtering system based on non-isolated output voltage reduction |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715683.9A CN104467737A (en) | 2014-11-29 | 2014-11-29 | Stable broadband filer |
| CN2014107156839 | 2014-11-29 | ||
| CN201510325048.4A CN104967427A (en) | 2014-11-29 | 2015-06-14 | Wideband filtering system based on non-isolated output voltage reduction |
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| Publication Number | Publication Date |
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| CN104967427A true CN104967427A (en) | 2015-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410715683.9A Pending CN104467737A (en) | 2014-11-29 | 2014-11-29 | Stable broadband filer |
| CN201510325048.4A Withdrawn CN104967427A (en) | 2014-11-29 | 2015-06-14 | Wideband filtering system based on non-isolated output voltage reduction |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410715683.9A Pending CN104467737A (en) | 2014-11-29 | 2014-11-29 | Stable broadband filer |
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| CN (2) | CN104467737A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107797088A (en) * | 2017-11-06 | 2018-03-13 | 广东省计量科学研究院（华南国家计量测试中心） | Collect the rechargeable type photoelectric trigger device of wideband filtering and infrared receiver function |
-
2014
- 2014-11-29 CN CN201410715683.9A patent/CN104467737A/en active Pending
-
2015
- 2015-06-14 CN CN201510325048.4A patent/CN104967427A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107797088A (en) * | 2017-11-06 | 2018-03-13 | 广东省计量科学研究院（华南国家计量测试中心） | Collect the rechargeable type photoelectric trigger device of wideband filtering and infrared receiver function |
| CN107797088B (en) * | 2017-11-06 | 2023-12-12 | 广东省计量科学研究院（华南国家计量测试中心） | Chargeable photoelectric trigger device integrating broadband filtering and infrared receiving functions |
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| CN104467737A (en) | 2015-03-25 |
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