CN105486893A - Oscillatory wave generation device - Google Patents
Oscillatory wave generation device Download PDFInfo
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- CN105486893A CN105486893A CN201410484394.2A CN201410484394A CN105486893A CN 105486893 A CN105486893 A CN 105486893A CN 201410484394 A CN201410484394 A CN 201410484394A CN 105486893 A CN105486893 A CN 105486893A
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Abstract
The invention discloses an oscillatory wave generation device. The oscillatory wave generation device comprises a power circuit used to provide alternating current, a switching circuit, a resonance circuit, and an isolation transformer. The first end of the switching circuit is connected with the power circuit. The first end of the isolation transformer is connected with the second end of the switching circuit. The second end of the isolation transformer is connected with the resonance circuit. Through the device, a problem that using a common switch to generate oscillatory waves influences waveform of the oscillatory waves is solved. The oscillatory wave generation device has anti-interference capability, and accuracy of the waveform of the oscillatory waves is guaranteed.
Description
Technical field
The present invention relates to field of power, in particular to a kind of apparatus for generating oscillating wave.
Background technology
At present, can there is air gap and harmfulness impurity because manufacturing process is immature or starting material are impure in the cable in practical application, simultaneously cable lay with operational process in the middle of also likely can produce various defect and cause shelf depreciation.Shelf depreciation is the operating larger potential safety hazard of power cable.Under the long term of shelf depreciation, insulating material is continuous agingly finally causes insulation breakdown, causes major accident.By to the weak link in the detection Timeliness coverage insulation system of shelf depreciation, find out failure cause, ensure power cable quality, ensure power system security reliability service, there is very important realistic meaning.But when Partial Discharge Detection is used for in-site measurement, external noise serious interference, brings a lot of difficulty to measurement.Prior art application damp oscillatory wave carries out detection and the location of shelf depreciation to cable.In order to ensure the accuracy of cable being carried out to Partial Discharge Detection, necessarily require the waveform of damp oscillatory wave accurate, then the device producing damp oscillatory wave should have effective antijamming capability.The device of traditional generation damp oscillatory wave adopts common switch usually.During by regulating the frequency of driving voltage identical with the resonance frequency of resonant tank, make resonant tank generation resonance.When in resonant tank, the voltage of electric capacity reaches preset voltage value, Closing Switch, then create damp oscillatory wave at resonant tank electric capacity place.But, certain time delay can be there is in the generation utilizing traditional switch to realize damp oscillatory wave, traditional switch performs an action slowly, and the impurity existed in switch can disturb the waveform of damp oscillatory wave, finally cause utilizing damp oscillatory wave to realize there is error to the detection of cable local discharge, have serious consequences.
Generating for utilizing regular tap in correlation technique the problem that the wave of oscillation affects wave of oscillation waveform, not yet proposing effective solution at present.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of apparatus for generating oscillating wave, to solve the problem utilizing the regular tap generation wave of oscillation to affect wave of oscillation waveform.
To achieve these goals, according to an aspect of the present invention, a kind of apparatus for generating oscillating wave is provided.This apparatus for generating oscillating wave comprises: power circuit, for providing alternating current; On-off circuit, the first end of on-off circuit is connected with power circuit; Resonant tank; And isolating transformer, the first end of isolating transformer is connected with the second end of on-off circuit, and the second end of isolating transformer is connected with resonant tank.
Further, this apparatus for generating oscillating wave also comprises: rectification circuit, is connected with power circuit, for AC rectification is become direct current; Filter capacitor, in parallel with rectification circuit; And inverter circuit, the first end of inverter circuit is in parallel with filter capacitor, for being square-wave signal by DC conversion.
Further, inverter circuit comprises: the first transistor group, wherein, the first transistor group comprises the first transistor, transistor seconds, third transistor and the 4th transistor, the first transistor is connected in parallel on the two ends of third transistor and the 4th transistor series after connecting with transistor seconds; And the first diode group, first diode group comprises the first diode, second diode, 3rd diode and the 4th diode, first diode is in parallel with the first transistor, second diode is in parallel with transistor seconds, and the 3rd diode is in parallel with third transistor, the 4th diode and the 4th coupled in parallel.
Further, this apparatus for generating oscillating wave also comprises: the first driver element, and the first pin of the first driver element is connected with the first transistor, and the second pin of the first driver element is connected with transistor seconds; And second driver element, the first pin of the second driver element is connected with third transistor, and the second pin of the second driver element is connected with the 4th transistor.
Further, this apparatus for generating oscillating wave also comprises: single-chip microcomputer, and the first pin of single-chip microcomputer is connected with the 3rd pin of the first driver element, and the second pin of single-chip microcomputer is connected with the 3rd pin of the second driver element.
Further, on-off circuit comprises: the first on-off circuit, and the first end of the first on-off circuit is connected with filter capacitor, and the second end of the first on-off circuit is connected with the first end of inverter circuit; And second switch circuit, the first end of second switch circuit is connected with the second end of inverter circuit, and the second end of second switch circuit is connected with the first end of isolating transformer.
Further, the first on-off circuit comprises: the 3rd driver element, and the first pin of the 3rd driver element is connected with the 3rd pin of single-chip microcomputer; 5th transistor, is connected with the second pin of the 3rd driver element; And the 5th diode, with the 5th coupled in parallel.
Further, second switch circuit comprises: transistor seconds group, in parallel with the first end of isolating transformer, and wherein, transistor seconds group comprises the 6th transistor and the 7th transistor, the 6th transistor AND gate the 7th transistor series; Second diode group, the second diode group comprises the 6th diode and the 7th diode, wherein, the 6th diode and the 6th coupled in parallel, the 7th diode and the 7th coupled in parallel; And four-wheel drive unit, the first pin of four-wheel drive unit is connected with the 4th pin of single-chip microcomputer, and the second pin of four-wheel drive unit is connected with the 6th transistor, and the 3rd pin of four-wheel drive unit is connected with the 7th transistor.
Further, resonant tank comprises inductance and electric capacity, is connected in parallel on the second end of isolating transformer after inductance and capacitances in series.
Further, rectification circuit comprises at least one commutation diode.
Comprised by apparatus for generating oscillating wave of the present invention: power circuit, for providing alternating current; On-off circuit, the first end of on-off circuit is connected with power circuit; Resonant tank; And isolating transformer, the first end of isolating transformer is connected with the second end of on-off circuit, second end of isolating transformer is connected with resonant tank, solve in correlation technique the problem utilizing the regular tap generation wave of oscillation to affect wave of oscillation waveform, and then reach the effect of the accuracy ensureing wave of oscillation waveform.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the first embodiment according to apparatus for generating oscillating wave of the present invention;
Fig. 2 is the schematic diagram of the second embodiment according to apparatus for generating oscillating wave of the present invention;
Fig. 3 is the schematic diagram of the 3rd embodiment according to apparatus for generating oscillating wave of the present invention; And
Fig. 4 is the structural representation according to apparatus for generating oscillating wave breaker in middle circuit of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Better the present invention program is understood in order to make those skilled in the art, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment obtained under those of ordinary skill in the art do not make creative work prerequisite, all should belong to protection scope of the present invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, and intention is to cover not exclusive comprising.
The present invention aims to provide a kind of apparatus for generating oscillating wave.Fig. 1 is the schematic diagram of the first embodiment according to apparatus for generating oscillating wave of the present invention, and as shown in Figure 1, apparatus for generating oscillating wave comprises: power circuit 10, on-off circuit 20, resonant tank 30 and isolating transformer 40.
Power circuit 10, for providing alternating current.
Power circuit 10 provides alternating current for this apparatus for generating oscillating wave, and wherein this alternating current can be 220V or 380V.
On-off circuit 20, the first end of on-off circuit 20 is connected with power circuit.
On-off circuit 20 controls the normal work of this apparatus for generating oscillating wave.The first end of on-off circuit 20 is connected with power circuit, and the second end of on-off circuit 20 is connected with the first end of isolating transformer 40.When on-off circuit 20 closes, this apparatus for generating oscillating wave normally works, and when on-off circuit 20 disconnects, this apparatus for generating oscillating wave can not obtain the alternating current that power circuit 10 provides, and cannot normally work.
Resonant tank 30, this resonant tank comprises inductance and electric capacity, is connected in parallel on the second end of isolating transformer 40 after inductance and capacitances in series.
Isolating transformer 40, the first end of isolating transformer 40 is connected with the second end of on-off circuit 20, second end of isolating transformer 40 is connected with resonant tank 30, isolating transformer 40 is mainly used in regulating ac-excited voltage, regulate the frequency of driving voltage, make the frequency of this driving voltage and the resonance frequency of resonant tank 30 just as, thus make resonant tank 30 resonance, produce resonance potential.When this resonance potential reaches preset voltage value, on-off circuit 20 is closed, time on-off circuit 20 short circuit, create damp oscillatory wave at the electric capacity place of resonant tank 30.
The apparatus for generating oscillating wave of first embodiment of the invention comprises power circuit 10, on-off circuit 20, resonant tank 30 and isolating transformer 40.When on-off circuit 20 is opened a way, the series loop of forming to the equivalent capacity of inductance and tested cable through isolating transformer 40 by power circuit 10 provides the ac-excited voltage that a voltage is lower.When the output frequency of the alternating current that power circuit 10 provides is identical with the resonance frequency of electric capacity with inductance, inductance and capacitor loop generation resonance, produce resonance high voltage.By regulating the alternating voltage of power circuit, the resonance potential in tested cable equivalent capacity is made to reach preset voltage value, by on-off circuit 20 short circuit, because inductance exists internal resistance, so, electric capacity creates damp oscillatory wave.Solved the problem utilizing the regular tap generation wave of oscillation to affect wave of oscillation waveform by first embodiment of the invention, make apparatus for generating oscillating wave have antijamming capability, ensure that the accuracy of wave of oscillation waveform.
Fig. 2 is the schematic diagram of the second embodiment according to apparatus for generating oscillating wave of the present invention, and as shown in Figure 2, apparatus for generating oscillating wave comprises: power circuit 10, on-off circuit 20, resonant tank 30, isolating transformer 40, rectification circuit 50, filter capacitor 60 and inverter circuit 70.Wherein, inverter circuit 70 comprises: the first transistor group 701 and the first diode group 702.
Rectification circuit 50, is connected with power circuit, for AC rectification is become direct current.This rectification circuit 50 at least comprises a commutation diode.Six commutation diode composition three-phase bridge rectification circuits are adopted in the embodiment of the present invention.
Filter capacitor 60, in parallel with rectification circuit.The DC voltage exported by rectification circuit 50 enters inverter circuit 70 through excess capacity filter capacitor 60.
Inverter circuit 70, the first end of inverter circuit is in parallel with filter capacitor, for being square-wave signal by DC conversion.Inverter circuit 70 in the embodiment of the present invention by four insulated gate bipolar transistor IGBTs respectively a fly-wheel diode in parallel form.The embodiment of the present invention uses IGBT switch to complete high-pressure electronic switch control rule, because IGBT power is large, input impedance is little, driving power is little, switching loss is little, and frequency of operation is high, and element volume is large, the advantages such as control circuit is simple, are very applicable to the fields such as alternating current generator, frequency converter, Switching Power Supply.
Particularly, inverter circuit 70 comprises: the first transistor group 701, wherein, the first transistor group comprises the first transistor, transistor seconds, third transistor and the 4th transistor, the first transistor is connected in parallel on the two ends of third transistor and the 4th transistor series after connecting with transistor seconds; And the first diode group 702, first diode group comprises the first diode, second diode, 3rd diode and the 4th diode, first diode is in parallel with the first transistor, second diode is in parallel with transistor seconds, and the 3rd diode is in parallel with third transistor, the 4th diode and the 4th coupled in parallel.Wherein, be an each IGBT fly-wheel diode in parallel, object be in order to electric current in circuit suddenly disappear time, the induction electromotive force produced in IGBT coil and fly-wheel diode consume, thus protect the safety of IGBT and other elements in circuit.
The apparatus for generating oscillating wave of the embodiment of the present invention comprises: power circuit 10, on-off circuit 20, resonant tank 30, isolating transformer 40, rectification circuit 50, filter capacitor 60 and inverter circuit 70.Utilize this apparatus for generating oscillating wave to solve and utilize the regular tap generation wave of oscillation to affect the problem of wave of oscillation waveform, the wave of oscillation waveform that apparatus for generating oscillating wave is generated is accurate.
Fig. 3 is the schematic diagram of the 3rd embodiment according to apparatus for generating oscillating wave of the present invention, as shown in Figure 3, apparatus for generating oscillating wave comprises: power circuit 10, on-off circuit 20, resonant tank 30, isolating transformer 40, rectification circuit 50, filter capacitor 60, inverter circuit 70, first driver element 80, second driver element 90 and single-chip microcomputer 110.
First pin of the first driver element 80, first driver element 80 is connected with the first transistor, and first drives second pin of single 80 yuan to be connected with transistor seconds; First pin of the second driver element 90, second driver element 90 is connected with third transistor, and the second pin of the second driver element 90 is connected with the 4th transistor; Single-chip microcomputer 110, the first pin of single-chip microcomputer 110 is connected with the 3rd pin of the first driver element 80, and the second pin of single-chip microcomputer 110 is connected with the 3rd pin of the second driver element 90.Single-chip microcomputer 110 is for the driver element of control IGBT.
The apparatus for generating oscillating wave of the embodiment of the present invention comprises: power circuit 10, on-off circuit 20, resonant tank 30, isolating transformer 40, rectification circuit 50, filter capacitor 60, inverter circuit 70, the first driver element 80, second driver element 90 and single-chip microcomputer 110.Utilize this apparatus for generating oscillating wave to solve and utilize the regular tap generation wave of oscillation to affect the problem of wave of oscillation waveform.
Fig. 4 is the structural representation according to apparatus for generating oscillating wave breaker in middle circuit of the present invention.As shown in Figure 4, the structure of this apparatus for generating oscillating wave breaker in middle circuit 20 comprises: the first on-off circuit 210 and second switch circuit 220.Wherein, the first on-off circuit 210 comprises: the 3rd driver element the 2101, five transistor 2102 and the 5th diode 2103.Second switch circuit 220 comprises: transistor seconds group 2201, second diode group 2202 and four-wheel drive unit 2203.
The first end of the first on-off circuit 210, first on-off circuit is connected with filter capacitor, and the second end of the first on-off circuit is connected with the first end of inverter circuit.This first on-off circuit is mainly used in controlling power circuit 10 and powers to whole device.When the first on-off circuit 210 is opened a way, this apparatus for generating oscillating wave cannot normally work; When the first on-off circuit 210 closes, power circuit 10 is the charging of this apparatus for generating oscillating wave, ensures the normal work of this device.
Particularly, the first on-off circuit 210 comprises: the first pin of the 3rd driver element the 2101, three driver element is connected with the 3rd pin of single-chip microcomputer; 5th transistor 2102, is connected with the second pin of the 3rd driver element; And the 5th diode 2103, with the 5th coupled in parallel.Wherein, the 5th transistor 2102 in the embodiment of the present invention is preferably IGBT, and the 5th diode 2103 is preferably fly-wheel diode.
Second switch circuit 220, the first end of second switch circuit is connected with the second end of inverter circuit, and the second end of second switch circuit is connected with the first end of isolating transformer.When the frequency of driving voltage makes resonant tank 30 reach resonant condition, improving driving voltage makes resonance potential reach preset voltage value, and now, second switch circuit 220 is by quick-make, the output of variable-frequency power sources, also by rapid short circuit, will produce the voltage and current wave of oscillation in resonant tank 30.
Particularly, second switch circuit 220 comprises: transistor seconds group 2201, in parallel with the first end of isolating transformer, and wherein, transistor seconds group comprises the 6th transistor and the 7th transistor, the 6th transistor AND gate the 7th transistor series; Second diode group 2202, second diode group comprises the 6th diode and the 7th diode, wherein, and the 6th diode and the 6th coupled in parallel, the 7th diode and the 7th coupled in parallel; First pin of four-wheel drive unit 2203, the four-wheel drive unit is connected with the 4th pin of single-chip microcomputer, and the second pin of four-wheel drive unit is connected with the 6th transistor, and the 3rd pin of four-wheel drive unit is connected with the 7th transistor.Wherein, the 5th transistor 2102 in the embodiment of the present invention is preferably IGBT, and the 5th diode 2103 is preferably fly-wheel diode.
On-off circuit 20 in the embodiment of the present invention comprises: comprising: the first on-off circuit 210 and second switch circuit 220.Wherein, the first on-off circuit 210 comprises: the 3rd driver element 2101 and the 5th transistor 2102.Second switch circuit 220 comprises: transistor seconds group 2201, second diode group 2202 and four-wheel drive unit 2203.This apparatus for generating oscillating wave adopts this on-off circuit 20 that whole apparatus for generating oscillating wave can be made to have significantly just interference performance, thus ensure that the accuracy of wave of oscillation waveform.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an apparatus for generating oscillating wave, is characterized in that, comprising:
Power circuit, for providing alternating current;
On-off circuit, the first end of described on-off circuit is connected with described power circuit;
Resonant tank; And
Isolating transformer, the first end of described isolating transformer is connected with the second end of described on-off circuit, and the second end of described isolating transformer is connected with described resonant tank.
2. apparatus for generating oscillating wave according to claim 1, is characterized in that, described apparatus for generating oscillating wave also comprises:
Rectification circuit, is connected with described power circuit, for described AC rectification is become direct current;
Filter capacitor, in parallel with described rectification circuit; And
Inverter circuit, the first end of described inverter circuit is in parallel with described filter capacitor, for being square-wave signal by described DC conversion.
3. apparatus for generating oscillating wave according to claim 2, is characterized in that, described inverter circuit comprises:
The first transistor group, wherein, described the first transistor group comprises the first transistor, transistor seconds, third transistor and the 4th transistor, described the first transistor is connected in parallel on the two ends of described third transistor and described 4th transistor series after connecting with described transistor seconds; And
First diode group, described first diode group comprises the first diode, second diode, 3rd diode and the 4th diode, described first diode is in parallel with described the first transistor, described second diode is in parallel with described transistor seconds, and described 3rd diode is in parallel with described third transistor, described 4th diode and described 4th coupled in parallel.
4. apparatus for generating oscillating wave according to claim 3, is characterized in that, described apparatus for generating oscillating wave also comprises:
First driver element, the first pin of described first driver element is connected with described the first transistor, and the second pin of described first driver element is connected with described transistor seconds; And
Second driver element, the first pin of described second driver element is connected with described third transistor, and the second pin of described second driver element is connected with described 4th transistor.
5. apparatus for generating oscillating wave according to claim 4, is characterized in that, described apparatus for generating oscillating wave also comprises:
Single-chip microcomputer, the first pin of described single-chip microcomputer is connected with the 3rd pin of described first driver element, and the second pin of described single-chip microcomputer is connected with the 3rd pin of described second driver element.
6. apparatus for generating oscillating wave according to claim 1, is characterized in that, described on-off circuit comprises:
First on-off circuit, the first end of described first on-off circuit is connected with described filter capacitor, and the second end of described first on-off circuit is connected with the first end of described inverter circuit; And
Second switch circuit, the first end of described second switch circuit is connected with the second end of described inverter circuit, and the second end of described second switch circuit is connected with the first end of described isolating transformer.
7. apparatus for generating oscillating wave according to claim 6, is characterized in that, described first on-off circuit comprises:
3rd driver element, the first pin of described 3rd driver element is connected with the 3rd pin of described single-chip microcomputer;
5th transistor, is connected with the second pin of described 3rd driver element; And
5th diode, with described 5th coupled in parallel.
8. apparatus for generating oscillating wave according to claim 6, is characterized in that, described second switch circuit comprises:
Transistor seconds group, in parallel with the first end of described isolating transformer, wherein, described transistor seconds group comprises the 6th transistor and the 7th transistor, the 7th transistor series described in described 6th transistor AND gate;
Second diode group, described second diode group comprises the 6th diode and the 7th diode, wherein, described 6th diode and described 6th coupled in parallel, described 7th diode and described 7th coupled in parallel; And
Four-wheel drive unit, first pin of described four-wheel drive unit is connected with the 4th pin of described single-chip microcomputer, second pin of described four-wheel drive unit is connected with described 6th transistor, and the 3rd pin of described four-wheel drive unit is connected with described 7th transistor.
9. apparatus for generating oscillating wave according to claim 1, is characterized in that, described resonant tank comprises inductance and electric capacity, is connected in parallel on the second end of described isolating transformer after described inductance and described capacitances in series.
10. apparatus for generating oscillating wave according to claim 1, is characterized in that, described rectification circuit comprises at least one commutation diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410484394.2A CN105486893B (en) | 2014-09-19 | 2014-09-19 | Apparatus for generating oscillating wave |
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| CN201410484394.2A CN105486893B (en) | 2014-09-19 | 2014-09-19 | Apparatus for generating oscillating wave |
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| CN105486893A true CN105486893A (en) | 2016-04-13 |
| CN105486893B CN105486893B (en) | 2019-06-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110296749A (en) * | 2018-03-22 | 2019-10-01 | Vega格里沙贝两合公司 | Impedance limit switch, medium limit level determine method and computer-readable medium |
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