CN116722764A - Design method of high-repetition-frequency pulse power supply - Google Patents
Design method of high-repetition-frequency pulse power supply Download PDFInfo
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- CN116722764A CN116722764A CN202310723768.0A CN202310723768A CN116722764A CN 116722764 A CN116722764 A CN 116722764A CN 202310723768 A CN202310723768 A CN 202310723768A CN 116722764 A CN116722764 A CN 116722764A
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- 238000013461 design Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007599 discharging Methods 0.000 claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 5
- 239000000110 cooling liquid Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000002788 crimping Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005658 nuclear physics Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M11/00—Power conversion systems not covered by the preceding groups
Abstract
The invention discloses a design method of a pulse power supply with high repetition working frequency, and belongs to the technical field of pulse power. The design method comprises the following steps: determining load working conditions, including pulse current requirements and repetition working frequency of each load; the pulse inductor design, according to the pulse current demand and the repetition working frequency of each load, calculating the equivalent working frequency and the thermal load of the pulse inductor, and optimizing the pulse inductor to enable the pulse inductor to meet the temperature rise requirement; the method comprises the steps of designing thyristors, determining the highest repeated working frequency of a single thyristor, and determining the number of required thyristors for each load; and (3) discharging time sequence control, namely setting the discharging time sequence of each thyristor so as to meet the requirement of the repeated working frequency of each load. The invention can realize the multi-load high-frequency operation of the pulse power supply by controlling the on-off of a plurality of groups of thyristors, improve the utilization rate of elements, reduce the volume of the pulse power supply, simultaneously reduce the heat load of a single thyristor by the time-sharing multiplexing of the thyristors, and improve the service life of the thyristors and the reliability of the system.
Description
Technical Field
The invention belongs to the technical field of pulse power, and particularly relates to a design method of a pulse power supply with high repetition working frequency.
Background
The pulse power supply is widely applied to the fields of national defense scientific research, high and new technology research, civil industry and the like, plays an important role in the technologies of nuclear physics, accelerators, lasers, electromagnetic emission and the like, and has great potential in the fields of chemical industry, environmental engineering, medical treatment and the like.
The pulse power supply comprises a pulse capacitor, a pulse inductor, a thyristor, a diode, a thyristor triggering and protecting device, an output cable and the like. The existing pulse power supply mostly adopts a unit modularized design, and each pulse power supply module is an independent power supply, comprises all the components of the pulse power supply and can only operate with a single load. However, in some application fields, such as electromagnetic emission and rock breaking with pulse power, the charging and discharging of the pulse power supply can be completed within a few seconds, and the load replacement needs a long time, so that the existing pulse power supply is adopted, and the utilization efficiency of the single-power-supply single-load operating element is low. Meanwhile, as the repetition working frequency of the discharging load is improved, the electric and thermal loads of the pulse inductor and the thyristor in the pulse power supply are obviously improved, and the risk of system failure is greatly increased.
Disclosure of Invention
Aiming at the defects and improvement demands of the prior art, the invention provides a design method of a pulse power supply with high repetition work frequency, which aims to solve the technical problems that the prior pulse power supply has low utilization efficiency of elements running with single power supply and single load, and the system failure risk is high along with the increase of the repetition work frequency of a discharge load.
In order to achieve the above object, the present invention provides a design method of a high repetition frequency pulse power source, the pulse power source includes a pulse capacitor, a pulse inductor and a plurality of thyristors, the design method includes:
determining load working conditions, including pulse current requirements and repetition working frequency of each load;
the pulse inductor design, according to the pulse current demand and the repetition working frequency of each load, calculating the equivalent working frequency and the thermal load of the pulse inductor, and optimizing the pulse inductor to enable the pulse inductor to meet the temperature rise requirement;
thyristor design, determining the highest repetition frequency f of a single thyristor s Designing the number of thyristors required by the ith load as N i ＝f i /f s Wherein f i For the repetition operating frequency of the ith load, i=1, …, n being the total number of loads;
and (3) discharging time sequence control, namely setting the discharging time sequence of each thyristor so as to meet the requirement of the repeated working frequency of each load.
Further, the loads are sequentially discharged, and the sequential discharge interval is greater than the pulse capacitor charging time.
Further, the equivalent working frequency of the pulse inductor is the sum of the repeated working frequency of each load, and the thermal load of the pulse inductor is determined according to the resistance value of the pulse inductor and the pulse current demand value of each load.
Further, the pulse inductor adopts a water-cooled inductor, and the temperature rise of the pulse inductor is controlled by adjusting the flow rate of the cooling liquid.
Further, the thyristor is formed by serial crimping of a thyristor valve block, a diode valve block, an outgoing copper bar and an insulating cushion block, wherein the outgoing copper bar is connected with a pulse inductor or an output cable, and the insulating cushion block is used for insulating the thyristor valve block and the diode valve block so as to protect the safety of the thyristor valve block, the diode valve block and a load.
Further, the discharge time sequence control generates control signals according to the requirements of various loads, controls the conduction of thyristors to meet the requirement of repeated working frequency of the loads, controls the sequential conduction of thyristors for the same load, and realizes time-sharing multiplexing.
Further, the weak current device in the discharge time sequence control adopts ferromagnetic material encapsulation, optical fiber transmission, external power supply isolation and internal lithium battery power supply.
In general, through the above technical solutions conceived by the present invention, the following beneficial effects can be obtained:
1. the invention improves the topology and design of the existing pulse power supply, and can realize the operation of one pulse power supply with multiple loads by controlling the on and off of the thyristors in time sequence, thereby improving the utilization rate of elements of the pulse power supply, reducing the volume of the pulse power supply and improving the energy density of the pulse power supply.
2. The invention realizes the cooling of the pulse inductor by the water cooling technology and improves the heat load capacity of the pulse inductor.
3. The invention realizes the time-sharing multiplexing of the thyristors by sequentially conducting the thyristors simultaneously, reduces the equivalent working frequency of each thyristor, and improves the service life of the thyristors and the reliability of the system.
4. The invention can realize multiple load carrier frequency operation by using single pulse power source through time-sharing multiplexing of the thyristors.
5. The invention further reduces the volume of the device by crimping the plurality of thyristors and the diode.
Drawings
Fig. 1 is a design flow chart of a design method of a pulse power supply with high repetition frequency according to an embodiment of the present invention.
Fig. 2 is a power topology diagram of a design method of a high repetition frequency pulse power supply according to an embodiment of the present invention.
Fig. 3 is a typical current waveform diagram of a design method of a high repetition frequency pulse power supply according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a water-cooled inductor according to a design method of a high-repetition-frequency pulse power supply according to an embodiment of the present invention.
Fig. 5 is a circuit diagram and a timing control schematic diagram of a design method of a pulse power supply with high repetition frequency according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In the present invention, the terms "first," "second," and the like in the description and in the drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
Referring to fig. 1, in combination with fig. 2 to 5, the present invention provides a design method of a pulse power supply with high repetition frequency, which mainly includes the following steps:
and step 1, determining load working conditions, including pulse current requirements and repetition working frequency of each load.
In some alternative embodiments, the load condition is determined, mainly by determining the pulse current requirement of the load and the repetition frequency of each load, and the repetition frequency of each load is set to be f because the repetition frequency of each load may be inconsistent 1 To f n . The pulse current requirement of each load is i 1 (t) to i n (t)。
And 2, designing a pulse inductor, calculating the equivalent working frequency and the thermal load of the pulse inductor according to the pulse current requirement and the repetition working frequency of each load, and optimizing the pulse inductor to enable the pulse inductor to meet the temperature rise requirement.
In some alternative embodiments, since each load current needs to flow through the pulse inductor to achieve multiplexing of the pulse inductors, the equivalent operating frequency f of the pulse inductor L For the sum f of the repetition frequencies of the individual loads L ＝f 1 +f 2 +···+f n . By pulse inductance resistance value R L And pulse current i 1 (t) to i n (t) calculating the pulse inductive thermal load P L ＝[i 1 2 (t)+i 2 2 (t)+···+i n 2 (t)]*R L Then according to the pulse inductance thermal load P L Equivalent working frequency f to pulse inductance L And calculating the temperature rise of the pulse inductor under the working condition, wherein the temperature rise of the pulse inductor can cause the inherent resistance of the pulse inductor to be increased and the overheating failure of the pulse inductor to cause that the pulse inductor can not meet the discharge requirement.If the design of the pulse inductor does not meet the requirement, the pulse inductor structure is optimized until the temperature rise of the pulse inductor meets the design requirement.
Specifically, the pulse inductor adopts a water-cooling inductor design, the heat load of the pulse inductor increases along with the increase of the load, and the water-cooling inductor is adopted to control the temperature rise of the pulse inductor through the flow velocity of cooling liquid, so that the optimization process is simplified.
Preferably, in one embodiment, the pulsed inductor is a hollow solenoid structure, as shown in FIG. 4. The internal diameter is 5.5mm, the external diameter is 13.5mm, the number of turns is 20, the spiral radius is 120mm, the pitch is 22mm, the inductance value is 30 mu H, the resistance value is 2mΩ, deionized water is used as cooling liquid, and when the flow rate is 4L.min, the single discharge temperature rise can return to the initial temperature when the next working point arrives.
Step 3, designing a thyristor, and determining the highest repetition working frequency f of a single thyristor s Designing the number of thyristors required by the ith load as N i ＝f i /f s Wherein f i For the repetition frequency of the i-th load, i=1, …, n is the total number of loads.
In some alternative embodiments, since thyristors are commonly purchased from manufacturers, the electrical and thermal loads are difficult to optimize during application, and the upper limit of the repetition frequency at which the thyristors can safely operate is fixed under the condition of a fixed pulse current intensity. The heat load and the temperature rise under the current working condition are calculated according to the thyristor parameters, wherein the thyristor heat load is obtained by calculating a thyristor voltage waveform U (t) according to a discharging current I (t) from a thyristor volt-ampere characteristic U=A+B×I+C×ln (I+1) +D×v I, calculating the thyristor heat load according to p (t) =u (t) ×i (t), and determining the highest repetition operating frequency f of the thyristor s . According to the repetition frequency f of the ith load i Designing the number of thyristors required by the ith load as N i ＝f i /f s Wherein, i=1, … and n, each thyristor is conducted in turn, realizing time-sharing multiplexing of the thyristors, reducing the equivalent working frequency of each thyristor, ensuring that each thyristor works in the highest working frequency, avoiding thermal failure of the thyristor and improving the service life of the thyristorAnd (5) a life.
The thyristor comprises a thyristor valve block, a diode valve block and an extraction copper bar which are connected with a pulse inductor or an output cable in series and in compression joint, wherein the extraction copper bar is used for insulating the thyristor valve block and the diode valve block so as to protect the safety of the thyristor valve block, the diode valve block and a load. Preferably, in a specific embodiment, the thyristor is a T408 type thyristor and a diode thereof manufactured by electric locomotives research limited of Zhongjia, the insulating cushion block of the thyristor is epoxy resin with the thickness of 10mm and the crimping pressure of 90kN, under the working condition, the highest repeated working frequency of the thyristor is 0.14Hz, and in order to ensure the repeated working frequency of load discharge, two thyristors are adopted for each load to discharge in sequence, and the equivalent discharge frequency of a single thyristor is 0.1Hz, thereby meeting the design requirement.
And 4, controlling discharge time sequences, and setting the discharge time sequences of the thyristors so as to meet the requirement of the repeated working frequency of each load.
In some alternative embodiments, the control signal is generated according to the repeated working frequency of the discharging load through time sequence control, and the control signal is divided into a load discharging signal of a thyristor between different loads and a time division multiplexing signal of the same load thyristor; and aiming at different loads, controlling the conduction of the thyristors to meet the requirement of repeated working frequency of the loads, and aiming at the same load, controlling the sequential conduction of the thyristors to realize time-sharing multiplexing.
Specifically, the weak current device in the discharge time sequence control adopts measures of electromagnetic interference resistance such as ferromagnetic material encapsulation, optical fiber transmission, external power supply isolation, internal lithium battery power supply and the like, and the damage of the weak current device and the erroneous conduction of a thyristor caused by the electromagnetic interference in the strong pulse discharge process are avoided.
Preferably, in a specific embodiment, for 0.2Hz alternating discharge load, each load is sequentially discharged by using 2 thyristors, the circuit diagram and discharge timing are as shown in fig. 5, and the thyristors S are in one discharge cycle 1 -S 4 Sequentially conducting, wherein the conducting time interval is 2.5s, the discharge cycle is 10s, the discharge frequency of a single thyristor is 0.1s, and each load flows a pulse power currentThe interval is 5s, the discharge frequency is 0.2Hz, and the design requirement is met.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. A method of designing a high repetition rate pulsed power supply, the pulsed power supply comprising a pulsed capacitor, a pulsed inductor and a plurality of thyristors, the method comprising:
determining load working conditions, including pulse current requirements and repetition working frequency of each load;
the pulse inductor design, according to the pulse current demand and the repetition working frequency of each load, calculating the equivalent working frequency and the thermal load of the pulse inductor, and optimizing the pulse inductor to enable the pulse inductor to meet the temperature rise requirement;
thyristor design, determining the highest repetition frequency f of a single thyristor s Designing the number of thyristors required by the ith load as N i ＝f i /f s Wherein f i For the repetition operating frequency of the ith load, i=1, …, n being the total number of loads;
and (3) discharging time sequence control, namely setting the discharging time sequence of each thyristor so as to meet the requirement of the repeated working frequency of each load.
2. The method of claim 1, wherein each load is sequentially discharged and the sequential discharge interval is greater than the pulse capacitor charging time.
3. The method for designing a high repetition rate pulsed power supply of claim 1, wherein the equivalent operating frequency of the pulsed inductor is a sum of repetition rates of the respective loads, and the thermal load of the pulsed inductor is determined according to a pulsed inductor resistance value and a pulsed current demand value of the respective loads.
4. The method for designing a high-repetition-rate pulse power supply according to claim 3, wherein the pulse inductor is a water-cooled inductor, and the temperature rise of the pulse inductor is controlled by adjusting the flow rate of the cooling liquid.
5. The design method of the high-repetition-rate pulse power supply according to claim 1, wherein the thyristor is formed by connecting a thyristor valve block, a diode valve block, an extraction copper bar and an insulating cushion block in series and pressing, wherein the extraction copper bar is connected with a pulse inductor or an output cable, and the insulating cushion block is used for insulating the thyristor valve block and the diode valve block so as to protect the safety of the thyristor valve block, the diode valve block and a load.
6. The method for designing a high-repetition-rate pulse power supply according to claim 1, wherein the discharge timing control generates control signals according to the requirements of each load, controls the switching on of thyristors to meet the requirements of the repetition rate of the load for different loads, and controls the sequential switching on of thyristors for the same load to realize time division multiplexing.
7. The method of claim 1, wherein the weak current device in the discharge timing control is made of ferromagnetic material, optical fiber transmission, external power isolation, and internal lithium battery power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310723768.0A CN116722764A (en) | 2023-06-16 | 2023-06-16 | Design method of high-repetition-frequency pulse power supply |
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| CN202310723768.0A CN116722764A (en) | 2023-06-16 | 2023-06-16 | Design method of high-repetition-frequency pulse power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117353712A (en) * | 2023-12-05 | 2024-01-05 | 华中科技大学 | Strong current pulse power supply assembly alternate multiplexing method based on data driving |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117353712A (en) * | 2023-12-05 | 2024-01-05 | 华中科技大学 | Strong current pulse power supply assembly alternate multiplexing method based on data driving |
| CN117353712B (en) * | 2023-12-05 | 2024-02-20 | 华中科技大学 | Strong current pulse power supply assembly alternate multiplexing method based on data driving |
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