CN203672952U - Bus voltage detection circuit of high-frequency dedusting power supply - Google Patents
Bus voltage detection circuit of high-frequency dedusting power supply Download PDFInfo
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- CN203672952U CN203672952U CN201420045134.0U CN201420045134U CN203672952U CN 203672952 U CN203672952 U CN 203672952U CN 201420045134 U CN201420045134 U CN 201420045134U CN 203672952 U CN203672952 U CN 203672952U
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Abstract
Disclosed in the utility model is a bus voltage detection circuit of a high-frequency dedusting power supply. The detection circuit comprises a voltage detection circuit unit, a differential amplification circuit, an opto-coupler isolation circuit, a voltage following circuit, and an amplitude limiting filtering circuit, wherein the above-mentioned components are successively connected in sequence. The voltage detection circuit unit is connected with a bus voltage; and the amplitude limiting filtering circuit is connected with a DSP. According to the scheme, the voltage detection circuit unit based on a series-connection voltage-dividing principle carries out voltage dividing on a bus voltage signal to form a small signal; the differential amplification circuit carries out amplification on the voltage signal; the opto-coupler isolation circuit carries out isolation processing; the voltage following circuit tracks the voltage signal and the load capacity of the signal is enhanced; and then the amplitude limiting filtering circuit sends the signal to the DSP for processing. The circuit has advantages of simpleness, high security and reliability, high anti-interference capability, easy implementation, and accurate reflection of a measured value.
Description
Technical field
The utility model relates to a kind of busbar voltage testing circuit of high-frequency dust removing power supply.
Background technology
Along with the progress of science and technology and social development, novel high-frequency dust removing power supply arises at the historic moment, how to realize the effective control to power supply, must be unable to do without the detection to power supply signal, and due to electric field and the magnetic field environment complexity of high-frequency and high-voltage power supply, serious interference, type selecting to components and parts and the antijamming capability of circuit require high, conventional signal deteching circuit has been difficult to reach the testing requirement to signal at present, a little less than antijamming capability, measuring-signal scope is little, is difficult to adapt to electric field and the magnetic field environment of high-frequency and high-voltage power supply.
Summary of the invention
For the existing the problems referred to above of existing high-frequency dust removing power supply signal testing circuit, the purpose of this utility model is to provide a kind of busbar voltage testing circuit of high-frequency dust removing power supply, this circuit adopts the principle of resistance in series dividing potential drop to sample to the busbar voltage of high-frequency and high-voltage power supply, mimic channel is processed voltage signal, voltage signal is carried out carrying out isolation processing through photoelectric coupled circuit after differential amplification, by simulating signal and digital signal isolation, minimizing interacts, again by the voltage signal process follow circuit processing after isolation, increase carrying load ability, finally DSP is sent in voltage stabilizing processing after filtering, can effectively detect the busbar voltage of high-frequency dust removing power supply.
The purpose of this utility model is achieved through the following technical solutions:
A busbar voltage testing circuit for high-frequency dust removing power supply, is characterized in that: this circuit comprises the voltage detecting circuit, differential amplifier circuit, optical coupling isolation circuit, voltage follower circuit and the limit filtration circuit that are linked in sequence successively; Voltage detecting circuit is connected with busbar voltage, and limit filtration circuit is connected with DSP.
Described busbar voltage testing circuit, wherein the resistance value of resistance R 1, R3 is greater than the resistance value of resistance R 2.To after two large resistance R 1, R3 and a small resistor R2 series connection, be connected in parallel on busbar voltage two ends, to busbar voltage dividing potential drop, and the voltage signal at R2 two ends is processed, at R2 two ends, Transient Suppression Diode T1 in parallel is subject to the damage of surge pulse to prevent electronic circuit, and parallel filtering capacitor C 1 is carried out filtering processing to the voltage signal collecting.
Described differential amplifier circuit comprises: operational amplifier U11, resistance R 4-R7, capacitor C 2, C3, wherein: resistance R 4 is connected with operational amplifier U11 negative, resistance R 5 is connected with operational amplifier U11 positive, resistance R 7 one termination operational amplifier U11 positive one terminations in analog, resistance R 6 is connected between the negative and output terminal of operational amplifier U11, capacitor C 2, C3 is connected with the power supply of operational amplifier respectively and connects in analog, play the effect of filtering, resistance R 4, R5, R6, tetra-resistances of R7 equate, voltage signal is realized to isobaric amplification, differential amplifier circuit has good inhibiting effect to common mode interference, increase stability and the reliability of circuit.
Described optical coupling isolation circuit comprises: operational amplifier U12, U31, optocoupler U2, resistance R 8-R10 and capacitor C 4-C7 be wherein: resistance R 8 is connected with operational amplifier U12 negative, capacitor C 4 is connected in parallel between the negative and output terminal of operational amplifier U12, play the effect of noise reduction, No. 1 pin of resistance R 9 concatenation operation amplifier U12 output terminals and optocoupler U2, operational amplifier U12 positive is connected and connects in analog with No. 4 pins of optocoupler U2, No. 3 pins of optocoupler U2 are connected with the negative of operational amplifier U12, after capacitor C 5 is in parallel with resistance R 10, be connected between operational amplifier U31 output terminal and negative, 5 pin of optocoupler U2 and operational amplifier U31's just joins digitally, realize busbar voltage testing circuit and controller isolation, capacitor C 6, C7 carries out filtering to the power supply of chip, improve the job stability of chip.
Described voltage follower circuit comprises: operational amplifier U32, wherein: the output terminal of operational amplifier U32 is connected with negative, input voltage is just joining, realizing 1:1 amplifies, voltage follower circuit input resistance is approximate infinitely great, output resistance is approximate infinitely small, has increased load capacity, has also played the effect of certain isolation.
Described limit filtration circuit comprises: voltage stabilizing diode D1, resistance R 11 and capacitor C 8, wherein after capacitor C 8 and voltage stabilizing diode D1 parallel connection, the one termination digitally other end is connected with resistance R 11, resistance R 11 and capacitor C 8 form low-pass filter, voltage stabilizing diode D1 plays the effect of amplitude limit, make the signal of output more smooth and reliable, voltage signal after treatment is directly sent into dsp controller.
The utility model method therefor is as follows: first by the voltage detecting circuit that adopts series connection voltage divider principle, bus voltage signal is divided into small-signal, by differential amplifier circuit, voltage signal is amplified again simultaneously, and carry out isolation processing through optical coupling isolation circuit, by voltage follower circuit, voltage signal is followed the tracks of again, increase the load capacity of signal, be sent to DSP processing finally by crossing limit filtration circuit.
Compared with present technology, the utlity model has following beneficial effect: the first, with mimic channel, the busbar voltage of high-frequency and high-voltage power supply is processed, circuit is simple, be easy to realize; The second, by the isolation of simulating signal and digital signal, reduce greatly outside interference, increase the practicality of detection signal; Three, can directly give DSP through filter circuit of pressure-stabilizing voltage signal after treatment and process, the 4th, this circuit has good antijamming capability, circuit is in service has at the scene obtained good effect.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing 1 and Fig. 2, embodiment of the present utility model is elaborated:
As shown in Figure 1, the present embodiment comprises: the voltage detecting 1, differential amplifier circuit 2, optical coupling isolation circuit 3, voltage follower circuit 4, the limit filtration circuit 5 that are linked in sequence successively.Voltage detecting circuit is connected with busbar voltage, and limit filtration circuit is connected with DSP.
Fig. 2 is circuit theory diagrams of the present utility model.In busbar voltage testing circuit; to after two large resistance R 1, R3 and a small resistor R2 series connection, be connected in parallel on busbar voltage two ends; to busbar voltage dividing potential drop; and the voltage signal at R2 two ends is processed; Transient Suppression Diode T1 in parallel and filter capacitor C1 at R2 two ends; capacitor C 1 mainly plays the effect of filtering noise reduction, and Transient Suppression Diode T1 can protect the precision components in electronic circuit effectively, avoids the damage of various surge pulses.
Differential amplifier circuit comprises: resistance R 4 and operational amplifier U11(model AD8034) negative is connected, resistance R 5 and operational amplifier U11(model AD8034) positive is connected, resistance R 7 one termination operational amplifier U11(model AD8034) positive one termination is in analog, resistance R 6 is connected on operational amplifier U11(model AD8034) negative and output terminal between, capacitor C 2, C3 is connected with the power supply of operational amplifier respectively and connects in analog, play the effect of filtering, resistance R 4, R5, R6, tetra-resistances of R7 equate, voltage signal is realized to isobaric amplification, differential amplifier circuit has good inhibiting effect to common mode interference, increase the stability of circuit.
Optical coupling isolation circuit comprises: resistance R 8 and operational amplifier U12(model AD8034) negative is connected, capacitor C 4 is connected in parallel on operational amplifier U12(model AD8034) negative and output terminal between, play the effect of noise reduction, resistance R 9 concatenation operation amplifier U12(model AD8034) No. 1 pin of output terminal and optocoupler U2 (model HCNR201), operational amplifier U12(model AD8034) positive is connected and connects in analog with No. 4 pins of optocoupler U2 (model HCNR201), No. 3 pins of optocoupler U2 (model HCNR201) and operational amplifier U12(model AD8034) negative be connected, after capacitor C 5 is in parallel with resistance R 10, be connected on operational amplifier U31(model AD8034) between output terminal and negative, 5 pin of optocoupler U2 (model HCNR201) and operational amplifier U31(model AD8034) just join digitally, realize busbar voltage testing circuit and controller isolation, capacitor C 6, C7 carries out filtering to the power supply of chip, improve the job stability of chip.
Voltage follower circuit comprises: operational amplifier U32(model AD8034) output terminal be connected with negative, input voltage is just joining, realizing 1:1 amplifies, voltage follower circuit input resistance is approximate infinitely great, output resistance is approximate infinitely small, increase load capacity, also played the effect of certain isolation.
Limit filtration circuit comprises: wherein after capacitor C 8 and voltage stabilizing diode D1 parallel connection, the one termination digitally other end is connected with resistance R 11, resistance R 11 and capacitor C 8 form low-pass filter, voltage stabilizing diode D1 plays the effect of amplitude limit, make input signal more smooth and reliable, voltage signal after treatment is directly sent into dsp controller.
First the utility model is divided into small-signal by the voltage detecting circuit that adopts series connection voltage divider principle by bus voltage signal, by differential amplifier circuit, voltage signal is amplified again simultaneously, and carry out isolation processing through optical coupling isolation circuit, by voltage follower circuit, voltage signal is followed the tracks of again, increase the load capacity of signal, be sent to DSP processing finally by crossing limit filtration circuit.In order to reduce the phase mutual interference between circuit, the utility model has adopted different Power supplies, simultaneously, separate in analog with digitally, wherein the size of V1, V2 is all 12V, and U11 and U12, U31 and U32 are integrated in respectively in a chip, adopts same power supply to chip power supply.
Claims (6)
1. a busbar voltage testing circuit for high-frequency dust removing power supply, is characterized in that: this circuit comprises the voltage detecting circuit (1), differential amplifier circuit (2), optical coupling isolation circuit (3), voltage follower circuit (4) and the limit filtration circuit (5) that are linked in sequence successively; Voltage detecting circuit (1) is connected with busbar voltage, and limit filtration circuit (5) is connected with DSP.
2. the busbar voltage testing circuit of high-frequency dust removing power supply according to claim 1, it is characterized in that: in described voltage detecting circuit, after resistance R 1, R2, R3 series connection, be connected in parallel on busbar voltage two ends, to busbar voltage dividing potential drop, and at R2 two ends parallel connection Transient Suppression Diode T1 and filter capacitor C1, voltage signal to R2 two ends is processed, and wherein the resistance value of resistance R 1, R3 is greater than the resistance value of resistance R 2.
3. the busbar voltage testing circuit of high-frequency dust removing power supply according to claim 1, it is characterized in that: described differential amplifier circuit comprises: operational amplifier U11, resistance R 4-R7, capacitor C 2, C3, wherein: resistance R 4 is connected with operational amplifier U11 negative, resistance R 5 is connected with operational amplifier U11 positive, resistance R 7 one termination operational amplifier U11 positive one terminations in analog, resistance R 6 is connected between the negative and output terminal of operational amplifier U11, capacitor C 2, C3 is connected with the power supply of operational amplifier respectively and connects in analog, play the effect of filtering, resistance R 4, R5, R6, tetra-resistances of R7 equate, differential amplifier circuit is realized isobaric amplification to voltage signal.
4. the busbar voltage testing circuit of high-frequency dust removing power supply according to claim 1, it is characterized in that: described optical coupling isolation circuit comprises: operational amplifier U12, U31, optocoupler U2, resistance R 8-R10 and capacitor C 4-C7 be wherein: resistance R 8 is connected with operational amplifier U12 negative, capacitor C 4 is connected in parallel between the negative and output terminal of operational amplifier U12, play the effect of noise reduction, No. 1 pin of resistance R 9 concatenation operation amplifier U12 output terminals and optocoupler U2, operational amplifier U12 positive is connected and connects in analog with No. 4 pins of optocoupler U2, No. 3 pins of optocoupler U2 are connected with the negative of operational amplifier U12, after capacitor C 5 is in parallel with resistance R 10, be connected between operational amplifier U31 output terminal and negative, 5 pin of optocoupler U2 and operational amplifier U31's just joins digitally, realize the isolation of simulating signal and digital signal, reduce signal interference, capacitor C 6, C7 carries out filtering to the power supply of chip, improve the job stability of chip.
5. the busbar voltage testing circuit of high-frequency dust removing power supply according to claim 1, it is characterized in that: described voltage follower circuit only includes: operational amplifier U32, wherein: the output terminal of operational amplifier U32 is connected with negative, input voltage is just joining, realizing 1:1 amplifies, the large output resistance of voltage follower circuit input resistance is little, has increased load capacity.
6. the busbar voltage testing circuit of high-frequency dust removing power supply according to claim 1, it is characterized in that: described limit filtration circuit comprises: voltage stabilizing diode D1, resistance R 11 and capacitor C 8, wherein after capacitor C 8 and voltage stabilizing diode D1 parallel connection, the one termination digitally other end is connected with resistance R 11, resistance R 11 and capacitor C 8 form low-pass filter, voltage stabilizing diode D1 plays the effect of amplitude limit, and acting in conjunction makes output signal more smooth and reliable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420045134.0U CN203672952U (en) | 2014-01-24 | 2014-01-24 | Bus voltage detection circuit of high-frequency dedusting power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420045134.0U CN203672952U (en) | 2014-01-24 | 2014-01-24 | Bus voltage detection circuit of high-frequency dedusting power supply |
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| CN203672952U true CN203672952U (en) | 2014-06-25 |
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| CN201420045134.0U Expired - Fee Related CN203672952U (en) | 2014-01-24 | 2014-01-24 | Bus voltage detection circuit of high-frequency dedusting power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760403A (en) * | 2014-01-24 | 2014-04-30 | 镇江天力变压器有限公司 | Bus voltage detection circuit of high-frequency precipitator power supply |
| CN106291065A (en) * | 2016-10-17 | 2017-01-04 | 成都前锋电子仪器有限责任公司 | A kind of voltage sample circuit |
| CN107634753A (en) * | 2017-10-24 | 2018-01-26 | 西安航空制动科技有限公司 | The interface circuit and its design method of aircraft anti-sliding control box signal output point |
| CN112816762A (en) * | 2021-01-04 | 2021-05-18 | 中国航空制造技术研究院 | Grid voltage real-time measuring device for electron beam welding |
-
2014
- 2014-01-24 CN CN201420045134.0U patent/CN203672952U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760403A (en) * | 2014-01-24 | 2014-04-30 | 镇江天力变压器有限公司 | Bus voltage detection circuit of high-frequency precipitator power supply |
| CN106291065A (en) * | 2016-10-17 | 2017-01-04 | 成都前锋电子仪器有限责任公司 | A kind of voltage sample circuit |
| CN107634753A (en) * | 2017-10-24 | 2018-01-26 | 西安航空制动科技有限公司 | The interface circuit and its design method of aircraft anti-sliding control box signal output point |
| CN112816762A (en) * | 2021-01-04 | 2021-05-18 | 中国航空制造技术研究院 | Grid voltage real-time measuring device for electron beam welding |
| CN112816762B (en) * | 2021-01-04 | 2023-11-03 | 中国航空制造技术研究院 | Grid voltage real-time measuring device for electron beam welding |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20190124 |