CN100553095C - A kind of high-frequency and high-voltage power supply that is used for the leakage of plastic liquid container detection - Google Patents
A kind of high-frequency and high-voltage power supply that is used for the leakage of plastic liquid container detection Download PDFInfo
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- CN100553095C CN100553095C CNB2006101655006A CN200610165500A CN100553095C CN 100553095 C CN100553095 C CN 100553095C CN B2006101655006 A CNB2006101655006 A CN B2006101655006A CN 200610165500 A CN200610165500 A CN 200610165500A CN 100553095 C CN100553095 C CN 100553095C
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Abstract
A kind of high-frequency and high-voltage power supply that is used for the leakage of plastic liquid container detection comprises silicon controlled rectifier intelligent object [2], filter capacitor [3], IGBT intelligent power module [4], resonant capacitance [5], high-frequency step-up transformer [6], high-pressure rotary electrode [7], control circuit [8], resonant inductance [9], current sensor [11], grounding electrode [12].Controllable silicon intelligence rectification module [2] is a single-phase full bridge SCR rectification circuit, and it becomes the pulsating voltage of an adjustable voltage amplitude with single phase industrial frequence 220V voltage transformation, behind the flat ripple of filter capacitor [3], obtains one at 0～310V adjustable DC voltage U
dIGBT intelligent power module [4] is single-phase full control IGBT inverter bridge, and it is with U
dBe transformed into the square-wave voltage u of the symmetry of an alternation equal with the switching frequency of IGBT
1High-frequency step-up transformer [6] is transformed into high voltage with the low-voltage that obtains on its low-voltage side coil, exports to load at coil two ends, high-pressure side.[7] two spray points of high-pressure rotary electrode are gone up the position of the leakage to be detected of liquid container [13] over against being placed on grounding electrode [12].
Description
Technical field
The present invention relates to a kind of high-frequency and high-voltage power supply, specially refer to a kind of bottleneck of liquid container or high-frequency and high-voltage power supply that the bottle leakage detects of being used for.
Background technology
At present, adopt certain special liquid of plastic containers splendid attire at production industries such as medicine and beverages more.Because the sealing property of container directly influences the quality of the fluid product of its internal tank, and then can have influence on the consumer's who uses this type of fluid product healthy and life security.Therefore, producing on the production line of this type of plastic liquid, the online detection of the wall of this type of liquid container being carried out sealing property is very important.
For liquid container leakage detection some special methods are arranged.Chinese patent 03157083, Chinese patent 01142523 and Chinese patent 200410086783 all are directly to contact with leakage according to leakage sensor, judge sensor to signal whether change the foundation of leakage as whether.The problem that the method that these liquid container leakages detect exists is; The one,, be difficult to wall to the container of high surface area and carry out comprehensive sealing property simultaneously and detect, the 2nd,, be difficult to detect the little fine defective that the wall of airtight container exists to micron-sized micro-pore.The existence of slight void can't produce the situation of tangible leakage, but can have influence on the quality of detected fluid product equally.Therefore, invention is a kind of can carry out comprehensive and careful detection method and be very important to the wall of liquid filling container.
Come the whether method of leakage of tracer liquid container with electrion, can carry out large-area detection, and can detect little to micron-sized micro-pore to the wall of liquid container.The principle of this method is: with plastic fluid container to be detected as load, with the voltage of the alternation of a kind of adjustable frequency of special high-frequency and high-voltage power supply output and size, act on and be placed on plastic containers and wait to hunt leak near the electrode at two ends at position.The amplitude and the frequency of the voltage of the alternation of power supply output are adjusted on the suitable size, at this moment, between the electrode at the two ends at the position of detecting leakage, are unlikely to produce tangible discharge.When seal defect appearred in the wall of detected liquid container, the dielectric strength of this rejected region reduced, and caused producing between the electrode at these rejected region two ends stronger discharge.At this moment, discharging current by plastic containers sharply increases, and after relevant control circuit has removed to detect this current signal that sharply increases, just can send the control corresponding instruction, there is the liquid container of seal defect to reject this, and it is labeled as defective item from production line.
The existing circuit that is used for the high-frequency and high-voltage power supply of electrion is directed to the load design of a certain particular type and structure often.When the state of type, structure and the discharge of load changed, the equivalent circuit parameter of load may have greatly changed, and can influence the output voltage of high-frequency and high-voltage power supply conversely.There are certain limitation in the size of the output voltage of therefore existing high-frequency and high-voltage power supply and the adjusting range of frequency, and the waveform of its output voltage, size and frequency often are difficult to satisfy the needs of the load operate as normal after changing.
Use electrion to come the tracer liquid container whether in the method for leakage, may relate to the load of different types, structure and discharge condition.On the production line that uses this method tracer liquid container, because the structure of liquid container to be detected and varying in size, the difference of the liquid conduction performance of splendid attire in container, and the structure of employed sparking electrode and discharging gap is different, and the circuit parameter that all may cause being in the equivalence of the liquid container in the different running statuses may be different.The difference of these circuit parameters can have influence on the runnability of high-frequency and high-voltage power supply, can have influence on waveform, size and the frequency of output voltage conversely.Therefore, be used for the high-frequency and high-voltage power supply of this detection method, in a bigger scope, the voltage of exporting an alternation with certain waveform, a certain size and frequency that satisfy to detect requires is very necessary.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, provide a kind of output voltage amplitude in the larger context and all adjustable high-frequency and high-voltage power supply of frequency, to satisfy the needs of loads different in the actual detected.
The present invention can continue to export an adjustable amplitude value, and ((sine voltage or the quasi-sine-wave voltage of the alternation of 500Hz～50kHz) act on bottleneck sealing detection position for 10kV～45kV) and frequency adjustable size.
The operation principle of high-frequency and high-voltage power supply of the present invention is: one of high-frequency and high-voltage power supply output has the sine voltage or the quasi-sine-wave voltage of a certain size and frequency, acts on two electrodes at the detected position of liquid container.Production line transmits a bottle to be detected between the electrode at leak detection two ends, position at regular intervals.When detected position does not have seal defect, between two electrodes at detected position, by a certain size leakage current.In detection time, if the size of the leakage current between these two electrodes keeps relative stability, this detected liquid container is considered to qualified products so, is sent to next operation in unit.When the seepage phenomenon appearred in detected position, the leakage current by these two electrodes sharply increased.When power supply of the present invention detects this leakage current that sharply increases, send liquid container leakage signal.This signal is sent to corresponding machine control unit, and corresponding actuator unloads the bottling liquid of leakage down from production line, and with it as substandard product.
The present invention includes: silicon controlled rectifier intelligent object, filter capacitor, IGBT intelligent power module, resonant capacitance, resonant inductance, high-frequency step-up transformer, control circuit, current sensor.
Phase line, the zero line of the ac input end of controllable silicon intelligence rectification module link to each other with phase line, the zero line of power frequency 220V mains supply respectively.The dc output end and the filter capacitor parallel connection of controllable silicon intelligence rectification module.Controllable silicon intelligence rectification module is a single-phase full bridge SCR rectification circuit, and it becomes single phase industrial frequence 220V voltage transformation the voltage of the pulsation of an adjustable voltage amplitude.This voltage obtains one in 0～310V adjustable DC voltage at last through the flat ripple effect of filter capacitor.
IGBT intelligent power module is a single-phase full control IGBT inverter bridge.The DC side input circuit of IGBT intelligent power module and filter capacitor parallel connection.IGBT intelligent power module becomes the dc voltage conversion of silicon controlled rectifier intelligent object output the square-wave voltage of the symmetry of the alternation that the switching frequency of the IGBT in and the IGBT intelligent power module equates.The circuit of the AC side of IGBT intelligent power module is composed in series by the low-voltage side coil of resonant capacitance, resonant inductance and high-frequency step-up transformer.One end of the high-pressure side coil of high-frequency step-up transformer, the grounding electrode that links to each other with a end with load (liquid container) is connected with grounding electrode together.The high-voltage output end of high-frequency step-up transformer, earth terminal are connected with high-pressure rotary electrode, grounding electrode respectively.Liquid container is placed on the grounding electrode, and two spray points of high-pressure rotary electrode face the position of the leakage to be detected of liquid container, spatially maintains a certain distance, and this distance is according to the actual needs adjustment that detects.
The equivalent parameters of resonant capacitance, resonant inductance and the circuit of looking to load-side from the low-pressure side of high-frequency step-up transformer has determined the resonance frequency of circuit jointly.The driving pulse of the IGBT switching tube in the IGBT intelligent power module that control circuit sends.Adjust the frequency of driving pulse, and make it equal the resonance frequency of circuit.At this moment, circuit generation resonance, the voltage of a lower alternation that obtains on its low-voltage side coil at high-frequency step-up transformer, this lower voltage boosts through high-frequency step-up transformer, two ends at its high-pressure side coil obtain a higher voltage, this higher voltage is exported to load through high-tension cable, to satisfy the needs that detect.
Description of drawings
Fig. 1 is the schematic block circuit diagram of high-frequency and high-voltage power supply of the present invention, among the figure: 1 power frequency 220V power supply, 2 silicon controlled rectifier intelligent objects, 3 filter capacitors, 4IGBT intelligent power module, 5 resonant capacitances, 6 high-frequency step-up transformers, 7 high-pressure rotary electrodes, 8 control circuits, 9 resonant inductances, 10 ground connection, 11 current sensors, 12 grounding electrodes, 13 liquid containers.
Embodiment
Further specify related content of the present invention below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, high-frequency and high-voltage power supply of the present invention comprises silicon controlled rectifier intelligent object 2, filter capacitor 3, IGBT intelligent power module 4, resonant capacitance 5, high-frequency step-up transformer 6, high-pressure rotary electrode 7, control circuit 8, resonant inductance 9, current sensor 11, grounding electrode 12.
High-frequency and high-voltage power supply main circuit of the present invention adopts the version of AC-DC-AC.
The AC-DC part of high-frequency and high-voltage power supply main circuit of the present invention is made up of controllable silicon intelligence rectification module 2 and filter capacitor 3.Phase line, the zero line of the ac input end of controllable silicon intelligence rectification module 2 link to each other with phase line, the zero line of power frequency 220V mains supply 1 respectively.The dc output end and filter capacitor 3 parallel connections of controllable silicon intelligence rectification module 2.Controllable silicon intelligence rectification module 2 is single-phase full bridge SCR rectification circuit, and it becomes single phase industrial frequence 220V voltage transformation the voltage of the pulsation of an adjustable voltage amplitude.This voltage obtains one at 0～310V adjustable DC voltage U at last through the flat ripple effect of filter capacitor 3
dOn the control panel of power supply,, adjust direct voltage U by the phase-shifting voltages of a potentiometer adjustment SCR rectification circuit
dSize.The function of this part can satisfy power supply in the requirement of internal pressure-regulating on a large scale.
The DC-AC part of high-frequency and high-voltage power supply main circuit of the present invention is made up of IGBT intelligent power module 4 (IGBT intelligent object).IGBT intelligent power module 4 is single-phase full control IGBT inverter bridge.The DC side input circuit of IGBT intelligent power module 4 and filter capacitor 3 parallel connections.IGBT intelligent power module 4 is with U
dBe transformed into the square-wave voltage u of the symmetry of the alternation that the switching frequency of the IGBT in and the IGBT intelligent power module 4 equates
1The AC side of IGBT intelligent power module 4 is connected with low-voltage side coil series circuit by resonant capacitance 5, resonant inductance 9 and high-frequency step-up transformer 6.Direct and the discharge load series connection of the high-pressure side coil of high-frequency step-up transformer 6.One end of the high-pressure side coil of high-frequency step-up transformer 6 is with load--the grounding electrode 12 that an end of liquid container 13 links to each other is connected with the earth (ground connection 10) together.The equivalent circuit parameter of resonant capacitance 5, resonant inductance 9, high-frequency step-up transformer 6 and load has determined the resonance frequency f of circuit jointly
rHigh-frequency step-up transformer 6 becomes a higher voltage with a lower voltage transformation that obtains on its low-voltage side coil, exports to load at the two ends of its high-pressure side coil, to satisfy the needs that detect.The high-voltage output end of high-frequency step-up transformer 6, earth terminal are connected with high-pressure rotary electrode 7, grounding electrode 12 respectively.Liquid container 13 is placed on the grounding electrode 12, and two spray points of high-pressure rotary electrode 7 face the position of the leakage to be detected of liquid container 13, spatially maintains a certain distance, and this distance is adjusted according to the actual needs that detects.During real work,, can not produce tangible electric discharge phenomena between two spray points of high-pressure rotary electrode 7 and the liquid container 13 if there is not the phenomenon of leakage in liquid container 13 positions to be detected.But, when liquid container 13 positions to be detected exist the leakage embodiment to resemble, will produce tangible electric discharge phenomena between two spray points of high-pressure rotary electrode 7 and the liquid container 13, current sensor 11 detects the discharging current of obvious increase, be arranged in the leakage testing circuit of control circuit 8, send a leakage detection signal and give corresponding mechanical actuating mechanism, thereby the liquid container of leakage is detected.
The method of adjustment of the operating frequency of high-frequency and high-voltage power supply of the present invention is described below.Under the certain situation of the structure of high-frequency step-up transformer 6, the circuit parameter of the no-load voltage ratio of transformer and equivalence remains unchanged, in order to guarantee that dissimilar loading on can both allow inverter circuit be in resonance condition under the different operating states, and obtain required sufficiently high operating voltage at load end, can be by adjusting the switching frequency f of the IGBT in resonant capacitance 5, resonant inductance 9 and the IGBT intelligent power module 4
sThe method of size.As switching frequency f
sEqual the resonance frequency f of circuit
rThe time, circuit produces resonance, and the equivalent electric circuit of resonant capacitance 5, resonant inductance 9, high-frequency step-up transformer 6 and load can equivalence be a resistance.By uniting the switching frequency f that adjusts the IGBT in resonant capacitance 5, resonant inductance 9 and the IGBT intelligent power module 4
sSize can be adjusted the frequency of the output voltage of power supply in the larger context.On the control panel of high-frequency and high-voltage power supply of the present invention, the size of resistance that can be by adjusting potentiometer is adjusted the switching frequency of the IGBT inverter circuit in the IGBT intelligent power module 4.
The concrete structure of high-frequency and high-voltage power supply of the present invention mainly is made up of mainframe box and high-frequency step-up transformer.The effect of mainframe box is: as the center control of power supply, and the power supply of an alternation is provided for high-frequency step-up transformer 6.High-frequency step-up transformer 6 is elevated to a sufficiently high voltage with the voltage of the alternation that mainframe box provides.This voltage can satisfy when seal defect appears in liquid container, produces the discharge of sufficient intensity, thereby can detect the existence of leakage.High-frequency step-up transformer and mainframe box is placed apart, high tension loop and low-voltage control circuit can be separated, increased the fail safe of power-supply system.
The control principle of high-frequency and high-voltage power supply of the present invention is as described below.
The 220V power frequency supply inlet wire of high-frequency and high-voltage power supply of the present invention is introduced in the mainframe box by 220V power frequency inlet wire plug.Close then mains switch on the back control panel that is positioned at mainframe box, thereby with the power supply of the major loop of high-frequency and high-voltage power supply of the present invention and the power connection of control loop.Close startup-shutdown switch on the front panel of mainframe box, the major loop contactor closes a floodgate, and control loop powers on, and the start indicator light on the panel is bright, and the digital wash head power connection on the panel also shows corresponding data.The trigger impulse of pulse-generating circuit output IGBT intelligent power module 4, but the pulse of IGBT intelligent power module 4 drive circuits is blocked at this moment, and inverter circuit quits work.At this moment, can adjust potentiometer, switching frequency adjustment potentiometer and high-tension current alarm settings potentiometer by the high pressure on the preceding control panel of mainframe box and preset relevant parameter.After the major loop Contactor Starting of high-frequency and high-voltage power supply of the present invention finishes, give delayed startup signal of major loop soft start contactor.When delay time arrives, the adhesive of soft start contactor with the soft start resistive short, thereby has been finished the whole soft start-up process of the start of power supply.
Behind the high voltage startup button on the preceding control panel of pressing high-frequency and high-voltage power supply of the present invention, height on the panel presses off indicator light and lights, the pulse blocking of IGBT intelligent power module 4 drive circuits is disengaged, and inverter circuit is started working, and high-frequency step-up transformer 6 begins to export high pressure.
When over current fault takes place the IGBT intelligent power module 4 of high-frequency and high-voltage power supply of the present invention, current foldback circuit will cut off the trigger impulse of IGBT intelligent power module 4, and with the outage of major loop contactor, the malfunction indicator lamp on the preceding control panel is lighted.Height on the preceding control panel presses off indicator light and extinguishes.Press the reset button that is positioned on the panel, malfunction indicator lamp is extinguished, the major loop contactor again electric adhesive, the soft start-up process that repeats to start shooting, high voltage startup button before pressing on the control panel, power supply recovers to export high pressure again, and HT pilot is lighted again.
Claims (3)
1, a kind of high-frequency and high-voltage power supply that is used for the leakage of plastic liquid container detection is characterized in that comprising silicon controlled rectifier intelligent object [2], filter capacitor [3], IGBT intelligent power module [4], resonant capacitance [5], high-frequency step-up transformer [6], high-pressure rotary electrode [7], control circuit [8], resonant inductance [9], current sensor [11], grounding electrode [12];
Main circuit adopts the version of AC-DC-AC, and the AC-DC part is made up of controllable silicon intelligence rectification module [2] and filter capacitor [3], and DC-AC partly is an IGBT intelligent power module [4]; Controllable silicon intelligence rectification module [2] is a single-phase full bridge SCR rectification circuit, it becomes single phase industrial frequence 220V voltage transformation the voltage of the pulsation of an adjustable voltage amplitude, this voltage obtains one at 0～310V adjustable DC voltage U through the flat ripple effect of filter capacitor [3]
dIGBT intelligent power module [4] is a single-phase full control IGBT inverter bridge; IGBT intelligent power module [4] is with U
dBe transformed into the square-wave voltage u of the symmetry of the alternation that the switching frequency of the IGBT in and the IGBT intelligent power module [4] equates
1High-frequency step-up transformer [6] becomes a higher voltage with a lower voltage transformation that obtains on its low-voltage side coil, exports to load at the two ends of its high-pressure side coil; Liquid container [13] is placed on the grounding electrode [12], and two spray points of high-pressure rotary electrode [7] face the position of the leakage to be detected of liquid container [13].
2, according to the described high-frequency and high-voltage power supply that is used for the leakage of plastic liquid container detection of claim 1, the phase line, the zero line that it is characterized in that the ac input end of controllable silicon intelligence rectification module [2] link to each other with phase line, the zero line of power frequency 220V mains supply [1] respectively, the dc output end and filter capacitor [3] parallel connection of controllable silicon intelligence rectification module [2]; The DC side input circuit of IGBT intelligent power module [4] and filter capacitor [3] parallel connection, the AC side of IGBT intelligent power module [4] is connected with low-voltage side coil series circuit by resonant capacitance [5], resonant inductance [9] and high-frequency step-up transformer [6]; Direct and the discharge load series connection of the high-pressure side coil of high-frequency step-up transformer [6], one end of the high-pressure side coil of high-frequency step-up transformer [6], the grounding electrode [12] that links to each other with a end with liquid container [13], be connected with the earth together, the high-voltage output end of high-frequency step-up transformer [6], earth terminal are connected with high-pressure rotary electrode [7], grounding electrode [12] respectively.
3, be used for the high-frequency and high-voltage power supply that leakage of plastic liquid container detects according to claim 1 is described, the equivalent parameters that it is characterized in that the equivalent circuit parameter of resonant capacitance [5], resonant inductance [9], high-frequency step-up transformer [6] and load has determined the resonance frequency f of circuit jointly
r, the switching frequency f of the IGBT in adjustment resonant capacitance [5], resonant inductance [9] and the IGBT intelligent power module [4]
s, can adjust the frequency of the output voltage of power supply in the larger context.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101655006A CN100553095C (en) | 2006-12-21 | 2006-12-21 | A kind of high-frequency and high-voltage power supply that is used for the leakage of plastic liquid container detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101655006A CN100553095C (en) | 2006-12-21 | 2006-12-21 | A kind of high-frequency and high-voltage power supply that is used for the leakage of plastic liquid container detection |
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| CN101013857A CN101013857A (en) | 2007-08-08 |
| CN100553095C true CN100553095C (en) | 2009-10-21 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102437755B (en) * | 2011-12-28 | 2014-02-19 | 房世平 | Inverse power supply control system |
| CN102914413A (en) * | 2012-09-01 | 2013-02-06 | 安徽南风环境工程技术有限公司 | Membrane detector |
| CN106229930B (en) * | 2016-09-18 | 2019-03-05 | 湖北科技学院 | A kind of DC power transmission line conductor ice prevention and static passive compensation device |
| CN107017791A (en) * | 2017-06-14 | 2017-08-04 | 山东阅芯电子科技有限公司 | High-voltage great-current tests power supply |
| CN115664333B (en) * | 2022-12-26 | 2023-03-10 | 宁波欧达光电有限公司 | Photovoltaic inverter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1423122A (en) * | 2001-11-30 | 2003-06-11 | 欧姆龙株式会社 | Leakage-liquid detector |
| CN2657277Y (en) * | 2003-06-24 | 2004-11-17 | 中国科学院电工研究所 | Plasma high frequency power supply for lightning arrester |
| CN1595131A (en) * | 2003-09-12 | 2005-03-16 | 蔡曾宇 | Leakage liquid detecting device |
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- 2006-12-21 CN CNB2006101655006A patent/CN100553095C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1423122A (en) * | 2001-11-30 | 2003-06-11 | 欧姆龙株式会社 | Leakage-liquid detector |
| CN2657277Y (en) * | 2003-06-24 | 2004-11-17 | 中国科学院电工研究所 | Plasma high frequency power supply for lightning arrester |
| CN1595131A (en) * | 2003-09-12 | 2005-03-16 | 蔡曾宇 | Leakage liquid detecting device |
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