CN102055362A - High-voltage pulse power supply for processing food with pulse electric field - Google Patents
High-voltage pulse power supply for processing food with pulse electric field Download PDFInfo
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Abstract
The invention discloses a high-voltage pulse power supply for processing a food with a pulse electric field. The power supply comprises a low-voltage pulse generating device and a boosting pulse transformer, wherein the low-voltage pulse generating device is a bipolar square wave pulse generating device; a secondary winding of the pulse transformer is connected with a sharpening circuit; and the sharpening circuit is used for sharpening the rising edge of high-voltage bipolar square wave pulse output by the pulse transformer and comprises a compensation pulse capacitor bank which is connected in parallel with the secondary winding of the pulse transformer and a magnetic switch block which is connected in series with the secondary winding. The high-voltage pulse power supply can provide bipolar sharp front edge square wave high-voltage pulse with rising time of less than 200 nanoseconds and voltage level of over 16 kV.
Description
Technical field
The invention belongs to the non-heat treatment of food high-pressure pulse electric field, a kind of bipolarity steep-front square wave high-voltage pulse power source system is provided.
Technical background
Utilizing high-pressure pulse electric to handle food is a problem of striding food engineering and two subjects of electrical engineering, and the research of carrying out at this problem is abroad compared early, uses also comparative maturity, at present the commercial applications of existing middle and small scale.Yet the ratio that domestic research is carried out is later, and technological progress is also slow, and its main cause is the development technical difficulty of high-voltage pulse power source.Be used for high-pressure pulse electric device that food handles at present and divide according to the waveform of pulse voltage and mainly be divided into Exponential Decay Wave and square wave, every kind of waveform all has unipolarity and two kinds of forms of bipolarity.External studies show that the treatment effect of square wave ratio index decaying wave is better, and the bipolarity waveform can better reduce electrode corrosion than unipolarity waveform, prevents to handle food and is polluted.Yet, the development ratio index decaying wave difficulty of square wave power, and bipolarity is more complicated more to the requirement of power supply architecture than unipolarity.
The development thinking of bipolar square wave power supply can be divided into two kinds.A kind of thinking is to produce action of low-voltage pulse earlier, becomes high-voltage pulse after the pulse transformer boosts; Another thinking is to produce high-voltage DC power supply earlier, then via switching device generation high-voltage pulse.Because the electric pressure of high-voltage pulse generally greater than 10kV, causes a kind of thinking of bipolar square wave that realizes in back to implement and can cause very big pressure to switching device.External research on this thinking is more advanced, develops effectively switch 150kV, the IGBT module group of 70MW, 16 IGBT connection in series-parallel of this module group employing such as the Diversified Technology company of the U.S..Yet domestic IGBT connection in series-parallel technology is immature, can't develop the IGBT connection in series-parallel module group that is applicable to suitability for industrialized production.For preceding a kind of thinking, external technology comparative maturity has had middle-size and small-size industrial applications device.This is representative with the OSU series of Ohio State Univ-Columbus USA wherein, and these devices adopt pulse transformer that action of low-voltage pulse is transformed into high-voltage pulse, to reduce the pressure to the IGBT control switch.At home, Shenzhen Graduate School of Tsinghua University takes the lead in developing steep-front bipolar square wave power supply, and the electric pressure of output reaches more than the 25kV.
For the high-voltage pulse power source that boosts via pulse transformer, because pulse transformer self mates load request, the requirement to the food electric parameter when high-pressure pulse electric is handled food is very strict.Because the conductivity of different food products differs greatly, and causes the equivalent load resistance of pulse transformer can differ tens of times.The variation of equivalent load resistance can have a strong impact on the waveform of bipolar square wave, makes the voltage waveform that finally is applied on the food that serious distortion take place.This research of handling food to high-pressure pulse electric brings error.Therefore, when exploitation is used for the bipolar square wave high-voltage pulse power source of food processing, can at first clearly handle the electric parameters such as conductivity of food abroad.Yet, to handling the requirement of electric parameters such as food conductivity, limited the scope of application of a cover high-voltage pulse power source, be the bottleneck that the restriction high-pressure pulse electric is handled food applications.
High-pressure pulse electric is handled the research of food, mainly concentrate on to the deactivation of microbe with to the passivation of enzyme.Meanwhile, the domestic development utilizes high-pressure pulse electric to urge the agricultural chemicals in old and the liquid towards food to carry out Research on degradation to drinks.The processing of these liquid towards food has been widened high-pressure pulse electric in the Application in Food field greatly based on the principle of electric field promotion chemical reaction.Studies show that of early stage, the rise time of voltage waveform is the important parameter that reaction takes place.Yet owing to pulse transformer designs and produces reason, existing many pulse power rise time are difficult to reach the nS order of magnitude generally at the uS order of magnitude.For the pulse transformer of large velocity ratio, this phenomenon is more outstanding.
Pulse steepness and magnetic compression theory based on magnetic switch often was applicable to Exponential Decay Wave in the past, and this mainly is because Exponential Decay Wave relatively easily obtains, and does not see relevant report at the pulse steepness theory and the practical activity thereof of square wave.
Summary of the invention
The objective of the invention is to overcome the above-mentioned defective of prior art and use bottleneck, provide a kind of impulse electric field to handle food bipolar square wave high-voltage pulse power source, to enlarge the range of application of same set of high-voltage pulse power source, expand the application that high-pressure pulse electric is handled food.
Impulse electric field provided by the invention is handled the food high-voltage pulse power source, comprise an action of low-voltage pulse generation device and a pulse transformer that boosts, it is characterized in that: described action of low-voltage pulse generation device is the bipolar square wave pulse generating device, the secondary winding of described pulse transformer connects the steepness circuit, the rising edge that is used for the high-voltage bipolar square-wave pulse of steepness pulse transformer output, this steepness circuit comprise and the compensated pulse capacitor group of the secondary winding parallel connection of pulse transformer and the magnetic switch group of connecting with this secondary winding.The action of low-voltage pulse generation device produces the low voltage dipole square-wave pulse, after the process pulse transformer boosts, form the high-voltage bipolar square-wave pulse, through behind the steepness circuit of forming by impulse compensation capacitance group and magnetic switch group, form the high-voltage bipolar square-wave pulse of steep-front again.
Wherein, the action of low-voltage pulse generation device can adopt following structure, comprising:
An energy storage capacitor and be connected to the dc charging power supply at its two ends;
The opposite elementary winding of two phase places of pulse transformer, they are connected with energy storage capacitor respectively, constitute two discharge loops of energy storage capacitor;
Two electronic power switches are located at respectively in two discharge loops of energy storage capacitor; And,
A controller, be connected with the control utmost point of described two electronic power switches, control two electronic power switch alternate conduction, alternately discharge to control described two discharge loops, thereby import the low voltage dipole square-wave pulse to pulse transformer by described two elementary windings to energy storage capacitor.
The action of low-voltage pulse generation device also can adopt following structure, comprising:
An energy storage capacitor and be connected to the dc charging power supply at its two ends;
An elementary winding of pulse transformer;
Four electronic power switches, first electronic power switch and second electronic power switch are serially connected with the two ends of energy storage capacitor and an end of the described elementary winding of public termination, and the 3rd electronic power switch and the 4th electronic power switch are serially connected with the two ends of energy storage capacitor and the other end of the described elementary winding of public termination; And,
A controller, be connected with the control utmost point of described four electronic power switches, control first, fourth electronic power switch and second and third electronic power switch alternate conduction, make energy storage capacitor just be connect the discharge loop of described elementary winding and the discharge loop alternating discharge of the described elementary winding of reversal connection, thereby import the low voltage dipole square-wave pulse to pulse transformer by described elementary winding.
The compensated pulse capacitor group of steepness circuit can adopt a high-voltage pulse capacitor, also can be made of plurality of high voltage pulse capacitor series connection or in parallel or connection in series-parallel.The magnetic switch group of steepness circuit can adopt a magnetic switch, also can be made of series connection of a plurality of magnetic switches or in parallel or connection in series-parallel.
Above-mentioned electronic power switch can be IGBT (insulated gate bipolar transistor) or GTO (gate turn off thyristor) or IGCT (integrated gate commutated thyristor) or MOSFET or IPM (Intelligent Power Module) or IEGT (electronics IEGT) etc.
The present invention utilizes the high-voltage bipolar square-wave pulse of the steepness circuit pulse transformer output of being made up of pulse capacitor group and magnetic switch group to handle, significantly reduce the rise time of square-wave pulse, rise time is reached in the 200nS, thereby can promote the generation of relevant chemical reaction in the food more effectively, can expand the application of high-pressure pulse electric in the non-heat treatment of food effectively.Simultaneously, this steepness circuit can be applied in the processing of the food with big conductivity the high-pressure pulse electric treatment facility, thereby can improve the range of application of same set of equipment effectively, through test, can handle conductivity is the big conductivity food liquid of 10mS/cm, and the output waveform of power supply can not distort.
High-voltage pulse power source of the present invention can provide the rise time in 200nS, the bipolarity steep-front square wave high-voltage pulse of electric pressure more than 16kV.
Description of drawings
Fig. 1 is the schematic diagram of embodiment 1 high-voltage pulse power source;
Fig. 2 is the schematic diagram of embodiment 2 high-voltage pulse power sources;
Fig. 3 adds the preceding measured bipolar square wave oscillogram of steepness circuit among the present invention, the conductivity that handle food this moment is 2mS/cm;
Fig. 4 adds the preceding measured bipolar square wave oscillogram of steepness circuit among the present invention, the conductivity that handle food this moment is 4mS/cm;
Fig. 5 adds the preceding measured bipolar square wave oscillogram of steepness circuit among the present invention, the conductivity that handle food this moment is 10mS/cm;
Fig. 6 adds measured bipolarity steep-front square-wave waveform figure behind the steepness circuit among the present invention, the conductivity that handle food this moment is 10mS/cm;
Fig. 7 adds the steep-front bipolar square wave rise time oscillogram that produces behind the steepness circuit among the present invention, the conductivity that handle food this moment is 10mS/cm.
Embodiment
The present invention proposes a kind of high-voltage pulse power source that can export the steep-front bipolar square wave, it can not only make the square wave rise time reach in the 200nS, effectively the expansion high-pressure pulse electric is handled the application of food, and waveform does not distort when handling the food of big conductivity, can improve the range of application of same set of equipment effectively.Electronic power switch among the present invention can adopt IGBT, GTO, IGCT, MOSFET, IPM, IEGT etc., is example below with IGBT, and the present invention will be further described to reach embodiment in conjunction with the accompanying drawings.
Embodiment 1:
As shown in Figure 1, this high-voltage pulse power source comprises an action of low-voltage pulse generation device 1 and a pulse transformer PT21 who boosts.Pulse transformer PT21 employing no-load voltage ratio is 1: 20 a bipolarity step-up pulse transformer, and it has two elementary winding and secondary winding that phase place is opposite.The secondary winding of pulse transformer PT21 compensated pulse capacitor group C22 in parallel, this secondary winding magnetic switch group MS21 that connects simultaneously, compensated pulse capacitor group C22 and magnetic switch group MS21 form the steepness circuit, are used for the rising edge of the high-voltage bipolar square-wave pulse of steepness pulse transformer PT21 output.Magnetic switch group MS21 can adopt by a plurality of magnetic switch series connection or magnetic switch group in parallel or that connection in series-parallel is formed, also can adopt single magnetic switch.Compensated pulse capacitor group C22 can adopt by series connection of plurality of high voltage pulse capacitor or compensated pulse capacitor group in parallel or that connection in series-parallel is formed, also can adopt single high-voltage pulse capacitor.
Action of low-voltage pulse generation device 1 is the bipolar square wave pulse generating device, and it comprises: opposite elementary winding, IGBT21, IGBT22, the controller 12 of two phase places of energy storage capacitor C21, dc charging power supply 11, pulse transformer PT21.Dc charging power supply 11 is connected to energy storage capacitor C21 two ends.The elementary winding that two phase places of pulse transformer PT21 are opposite is connected with energy storage capacitor C21 respectively, constitutes two discharge loops of energy storage capacitor C21.IGBT21, IGBT22 are connected in two discharge loops of energy storage capacitor C21, controller 12 is connected with the control utmost point of IGBT21, IGBT22, control their alternate conduction, alternately discharge to control described two discharge loops, thereby import the adjustable low voltage dipole square-wave pulse of 1-1000V to pulse transformer PT21 by two elementary windings of pulse transformer PT21 to energy storage capacitor C21.
The low voltage dipole square-wave pulse that 1-1000V is adjustable is after pulse transformer PT21 boosts, produce the rise time about 2uS, voltage magnitude can reach the high-voltage bipolar square-wave pulse of 16kV, after passing through described steepness processing of circuit again, produce the rise time about 200nS, amplitude can reach the high-voltage bipolar square-wave pulse of 16kV.
The controller of action of low-voltage pulse generation device 1 can adopt DSP and touch screen combination to realize or realize or realize with individual PC with single-chip microcomputer and touch screen combination; its output control signal is added on the drive circuit of IGBT21, IGBT22; control IGBT21, IGBT22 conducting or end; thereby accurately control the electric parameters such as pulsewidth, frequency of the high-voltage square-wave pulse of this high-voltage pulse power source output; make that the pulsewidth of pulse can be step change with 1uS, and the protective circuit of IGBT can provide protection effectively when faults such as circuit generation overvoltage, overcurrent.
The electric pressure of the high-voltage square-wave pulse of this high-voltage pulse power source output is greater than 16KV, and when the processing conductivity was the food of 10mS/cm, the rise time of this high-voltage square-wave pulse can maintain 200 ± 10ns.
Embodiment 2:
With reference to Fig. 2, this high-voltage pulse power source comprises an action of low-voltage pulse generation device and a pulse transformer PT31 who boosts.Pulse transformer PT31 employing no-load voltage ratio is 1: 20 a unipolarity step-up pulse transformer, and it has an elementary winding and a secondary winding.The secondary winding of pulse transformer PT31 compensated pulse capacitor group C32 in parallel, this secondary winding magnetic switch group MS31 that connects simultaneously, compensated pulse capacitor group C32 and magnetic switch group MS31 form the steepness circuit, are used for the rising edge of the high-voltage bipolar square-wave pulse of steepness pulse transformer PT31 output.Magnetic switch group MS31 can adopt by a plurality of magnetic switch series connection or magnetic switch group in parallel or that connection in series-parallel is formed, also can adopt single magnetic switch.Compensated pulse capacitor group C32 can adopt by series connection of plurality of high voltage pulse capacitor or compensated pulse capacitor group in parallel or that connection in series-parallel is formed, also can adopt single high-voltage pulse capacitor.
Wherein, the action of low-voltage pulse generation device is the bipolar square wave pulse generating device, and it comprises: energy storage capacitor C31, dc charging power supply 11, the elementary winding of pulse transformer PT31, four IGBT of IGBT31-IGBT34, controller 12.Dc charging power supply 11 is connected to the two ends of energy storage capacitor C31.IGBT31 (i.e. an IGBT) and IGBT32 (i.e. the 2nd IGBT) are serially connected with the two ends of energy storage capacitor C31 and an end of the elementary winding of public termination pulse transformer PT31, and IGBT33 (i.e. the 3rd IGBT) and IGBT34 (i.e. the 4th IGBT) also are serially connected with the two ends of energy storage capacitor C31 and the other end of the elementary winding of public termination pulse transformer PT31.The control utmost point of four IGBT of controller 12 and IGBT31-IGBT34 is connected, control first, fourth IGBT and second and third IGBT alternate conduction (that is: in the preceding half period, the one IGBT and the equal conducting of the 4th IGBT, the 2nd IGBT and the 3rd IGBT all end, in the later half cycle, the one IGBT and the 4th IGBT all end, the 2nd IGBT and the equal conducting of the 3rd IGBT; Perhaps opposite.), make energy storage capacitor C31 just be connect the discharge loop of the elementary winding of pulse transformer PT31 and the discharge loop alternating discharge of the elementary winding of reversal connection pulse transformer PT31, thereby import the adjustable low voltage dipole square-wave pulse of 1-1000V to pulse transformer PT31 by the elementary winding of pulse transformer PT31.
The low voltage dipole square-wave pulse that 1-1000V is adjustable is after pulse transformer PT31 boosts, produce the rise time about 2uS, voltage magnitude can reach the high-voltage bipolar square-wave pulse of 16kV, after passing through described steepness processing of circuit again, produce the rise time about 200nS, amplitude can reach the high-voltage bipolar square-wave pulse of 16kV.
Through test, the high-voltage pulse power source of the foregoing description 1,2, before adding the steepness circuit, the rise time of the high-voltage pulse of output is about 2uS, voltage magnitude can reach 16kV, and when being the food of 2mS/cm with this high-voltage pulse power source processing conductivity, the oscillogram that measures as shown in Figure 3, as seen from the figure, the rise time of square-wave pulse is about 2uS.When being used for handling conductivity and being the food of 4mS/cm, the oscillogram that measures as shown in Figure 4, as seen from the figure, impulse waveform distorts, the rise time of square-wave pulse is about 4uS.When being used for handling conductivity and being the food of 10mS/cm, the oscillogram that measures as shown in Figure 5, impulse waveform has distorted and has been triangular wave.
And the high-voltage pulse power source of the foregoing description 1,2 (after comprising the steepness circuit), the rise time of the high-voltage pulse of output about 200nS, steepness the forward position of high-voltage bipolar square-wave pulse.Shown in Fig. 6 and 7, when being used for handling conductivity and being the food of 10mS/cm, also this has expanded research and application that high-pressure pulse electric is handled food about 200nS the rise time that can make high-voltage pulse.No matter and how many conductivity of handling food is, through making output voltage waveforms rising edge steepening behind the pulse steepness circuit among the present invention, obviously distortion does not take place in voltage waveform, and this has widened the range of application of same set of equipment.
Claims (7)
1. an impulse electric field is handled the food high-voltage pulse power source, comprise an action of low-voltage pulse generation device and a pulse transformer that boosts, it is characterized in that: described action of low-voltage pulse generation device is the bipolar square wave pulse generating device, the secondary winding of described pulse transformer connects the steepness circuit, the rising edge that is used for the high-voltage bipolar square-wave pulse of steepness pulse transformer output, this steepness circuit comprise and the compensated pulse capacitor group of the secondary winding parallel connection of pulse transformer and the magnetic switch group of connecting with this secondary winding.
2. high-voltage pulse power source as claimed in claim 1 is characterized in that, described action of low-voltage pulse generation device comprises:
An energy storage capacitor and be connected to the dc charging power supply at its two ends;
The opposite elementary winding of two phase places of pulse transformer, they are connected with energy storage capacitor respectively, constitute two discharge loops of energy storage capacitor;
Two electronic power switches are located at respectively in two discharge loops of energy storage capacitor; And,
A controller, be connected with the control utmost point of described two electronic power switches, control two electronic power switch alternate conduction, alternately discharge to control described two discharge loops, thereby import the low voltage dipole square-wave pulse to pulse transformer by described two elementary windings to energy storage capacitor.
3. high-voltage pulse power source as claimed in claim 1 is characterized in that, described action of low-voltage pulse generation device comprises:
An energy storage capacitor and be connected to the dc charging power supply at its two ends;
An elementary winding of pulse transformer;
Four electronic power switches, first electronic power switch and second electronic power switch are serially connected with the two ends of energy storage capacitor and an end of the described elementary winding of public termination, and the 3rd electronic power switch and the 4th electronic power switch are serially connected with the two ends of energy storage capacitor and the other end of the described elementary winding of public termination; And,
A controller, be connected with the control utmost point of described four electronic power switches, control first, fourth electronic power switch and second and third electronic power switch alternate conduction, make energy storage capacitor just be connect the discharge loop of described elementary winding and the discharge loop alternating discharge of the described elementary winding of reversal connection, thereby import the low voltage dipole square-wave pulse to pulse transformer by described elementary winding.
4. as claim 1 or 2 or 3 described high-voltage pulse power sources, it is characterized in that: the compensated pulse capacitor group of described steepness circuit is a high-voltage pulse capacitor, perhaps the pulse capacitor group that is made of plurality of high voltage pulse capacitor series, parallel or connection in series-parallel.
5. as claim 1 or 2 or 3 described high-voltage pulse power sources, it is characterized in that: the magnetic switch group of described steepness circuit is a magnetic switch, perhaps the magnetic switch group that is made of a plurality of magnetic switch series, parallel or connection in series-parallel.
6. high-voltage pulse power source as claimed in claim 1, it is characterized in that: the electric pressure of the high-voltage square-wave pulse of output is greater than 10kV, when the processing conductivity was not higher than the food of 10mS/cm, the rise time of the rising edge of this high-voltage square-wave pulse maintained in the 200ns.
7. high-voltage pulse power source as claimed in claim 1 is characterized in that: the low voltage dipole square-wave pulse of described action of low-voltage pulse generation device output 1-1000V.
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| CN106100432A (en) * | 2016-07-13 | 2016-11-09 | 杭州合宝电源有限公司 | A kind of piezoelectric ceramic atomizer patch drive circuit |
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| CN108718158A (en) * | 2018-07-15 | 2018-10-30 | 浙江大维高新技术股份有限公司 | Corona discharge pulse plasma electrical source frequency multiplier circuit |
| CN110932707A (en) * | 2019-12-06 | 2020-03-27 | 西北核技术研究院 | Circuit structure for reducing saturation inductance of magnetic switch and magnetic switch |
| CN112737395A (en) * | 2020-12-25 | 2021-04-30 | 西安交通大学 | Bipolar all-solid-state LTD square wave pulse generating circuit |
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| CN106160544A (en) * | 2016-07-03 | 2016-11-23 | 衢州昀睿工业设计有限公司 | The power output circuit of multiple transformers series connection |
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| CN110932707A (en) * | 2019-12-06 | 2020-03-27 | 西北核技术研究院 | Circuit structure for reducing saturation inductance of magnetic switch and magnetic switch |
| CN112737395A (en) * | 2020-12-25 | 2021-04-30 | 西安交通大学 | Bipolar all-solid-state LTD square wave pulse generating circuit |
| CN112737395B (en) * | 2020-12-25 | 2022-05-20 | 西安交通大学 | Bipolar all-solid-state LTD square wave pulse generating circuit |
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Application publication date: 20110511 |