CN220357191U - High-voltage repetition frequency pulse capacitor life testing device - Google Patents
High-voltage repetition frequency pulse capacitor life testing device Download PDFInfo
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- CN220357191U CN220357191U CN202321621426.XU CN202321621426U CN220357191U CN 220357191 U CN220357191 U CN 220357191U CN 202321621426 U CN202321621426 U CN 202321621426U CN 220357191 U CN220357191 U CN 220357191U
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- 239000003990 capacitor Substances 0.000 title claims abstract description 94
- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 238000007599 discharging Methods 0.000 claims abstract description 27
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 238000010998 test method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a life testing device of a high-voltage repetition frequency pulse capacitor, which comprises a charging loop and a discharging loop, wherein the charging loop charges a tested capacitor, the discharging loop comprises a discharging switch, a loop inductor and a loop resistor which are connected with the tested capacitor in series to form a loop, the life testing device also comprises a current and voltage monitoring module and a control module, the current and voltage monitoring module is used for detecting the current and the voltage of the tested capacitor, and the control module is connected with the discharging switch to control the closing of the discharging switch. The utility model establishes a life test method aiming at the repetition frequency pulse capacitor to study the life characteristic of the capacitor working at the repetition frequency; in the discharging loop, the adopted thyristor has the characteristic of a silicon rectifying device, can work under the conditions of high voltage and large current, and the working process of the thyristor can be controlled. The utility model connects a plurality of capacitors in parallel and adopts the pulse power switch to control, thereby greatly improving the test efficiency of the capacitor.
Description
Technical Field
The utility model relates to a pulse capacitor, in particular to a life testing device for a high-voltage repetition frequency pulse capacitor.
Background
The high-voltage pulse capacitor is a capacitor with special purposes, is also an element for the key planning and development of the national ministry of industrial and information, has high technical content of products, can provide large peak current, has the characteristics of advancement and high reliability, and has wide application in the fields of electric power industry, national defense industry and other high and new technologies. Pulse capacitors are the most common energy storage element in practical applications of pulse power technology and are also an important component of many pulse discharge devices.
In recent years, research and development of pulse capacitors has driven the application of pulse power technology to a wider range of fields, and capacitors that operate under single pulse conditions generally do not take into account the thermal effects of current flowing through the electrodes. However, when the capacitor works at the repetition frequency, the electric power generated by the large pulse current through the capacitor can possibly cause the damage of the element, the capacitor is in an open circuit state or the capacitance is greatly reduced, and the failure mechanism is the result of the combined action of electric, thermal and mechanical stress, so that the service life of the capacitor is directly reduced. In the field of engineering practical application, the pulse power technology basically needs to operate at a certain repetition frequency, and under the working condition that the pulse capacitor is repeatedly charged and discharged, larger electrodynamic force damage and energy loss can be generated in the pulse capacitor, so that the service life of the capacitor is reduced or even broken down. Capacitor failures occur in large systems, the consequences can be catastrophic, with losses far greater than the cost of maintaining the equipment. Among the various performance parameters of the pulse capacitor, the charge and discharge life is also the index of most concern of some college scientific research institutions and equipment manufacturers, and for the pulse capacitor with the repetition frequency, a life test method is established to study the life characteristics of the capacitor working at the repetition frequency, and before the pulse capacitor is put into operation, a part of samples of the pulse capacitor are taken for life test. Therefore, research on the charge-discharge life of pulse capacitors at repetition frequencies is important to manufacture high-performance, long-life capacitors and to promote the development of pulse power technology.
The traditional life test is carried out on the pulse capacitor, and mainly working conditions under practical application of various capacitors are used as test parameters to carry out voltage and current withstanding tests of different grades. According to the application fields of the capacitor, different fields and different series of capacitors are different in service life test times, and in the service life test process of the pulse capacitor, the dielectric loss tangent value of the pulse capacitor exceeds 0.002 or the capacitance of the pulse capacitor is reduced by 5% to serve as a standard of capacitor failure.
In general, when the high-voltage pulse capacitor is in a charging and discharging working state, the discharging time is far smaller than the charging time, so that the service life characteristic and quality of the high-voltage pulse capacitor are measured, the working time under continuous pressure resistance is not used as an index, and the number of times of charging and discharging at a certain repetition frequency is used as a measurement standard. In order to study the life characteristics of the high-voltage pulse capacitor and estimate the reliability of the series capacitors, a charge-discharge test is required.
Disclosure of Invention
The utility model aims at: the life testing device and method for the high-voltage repetition frequency pulse capacitor are provided, and the life characteristics of the capacitor working at the repetition frequency are researched aiming at the repetition frequency pulse capacitor, and meanwhile, the life testing of the repetition frequency pulse capacitor in batches can be realized under the test conditions of trial production of a large number of repetition frequency pulse capacitors so as to improve the efficiency of the testing process.
The technical scheme of the utility model is as follows:
the life testing device of the high-voltage repetition frequency pulse capacitor comprises a charging loop and a discharging loop, wherein the charging loop charges a tested capacitor C, and the discharging loop comprises a discharging switch V, a loop inductance L and a loop resistance R which are connected in series with the tested capacitor C to form a loop.
Preferably, the device also comprises a current and voltage monitoring module and a control module, wherein the current and voltage monitoring module is used for detecting the current and voltage of the capacitor C to be tested, and the control module is connected with the discharge switch V to be controlled to be closed.
Preferably, the discharge switch V adopts a thyristor.
Preferably, the number of the thyristors is multiple, and the thyristors are sequentially connected in series to increase the voltage endurance capacity.
Preferably, the number of the tested capacitors C is multiple, each tested capacitor is respectively connected in parallel, and each parallel branch is connected with a pulse power switch in series.
Preferably, the charging circuit comprises a charging power supply, a charging resistor RL and a charging switch S1 which are connected in series.
The utility model has the advantages that:
1. according to the utility model, a life test method is established for the repetition frequency pulse capacitor to study the life characteristic of the capacitor working at the repetition frequency, and before the pulse capacitor is put into operation, a part of samples of the pulse capacitor can be taken for life test;
2. in the discharging loop, the thyristor is adopted to conduct pulse discharging, the thyristor has the characteristic of a silicon rectifying device, can work under the conditions of high voltage and large current, and the working process can be controlled, and when the voltage is too high, the thyristor can be connected in series, so that the integral voltage-resistant capacity is increased;
3. the utility model connects a plurality of capacitors in parallel and adopts the pulse power switch to control, thereby greatly improving the test efficiency of the capacitor.
Drawings
The utility model is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a schematic diagram of a high voltage repetition frequency pulse capacitor life test device of the present utility model;
FIG. 2 is a schematic diagram of a test circuit of the apparatus of the present utility model.
Detailed Description
The utility model discloses a life testing device of a high-voltage repetition frequency pulse capacitor, which comprises a charging loop, a discharging loop, a current and voltage monitoring module and a control module, wherein the charging loop charges a tested capacitor, the discharging loop discharges the tested capacitor, the current and voltage monitoring module is used for detecting the current and voltage of the tested capacitor, and the control module is connected with a switch for controlling the charging loop and the discharging loop.
As shown in fig. 1, the measured capacitors include C1 and C2 … … Cn, the measured capacitors are respectively connected in parallel, and each parallel branch is respectively connected in series with a pulse power switch SC1 and SC2 … … SCn.
The charging loop comprises a charging power supply P.S., a charging resistor RL and a charging switch S1 which are connected in series with a tested capacitor to form a loop. The discharging loop comprises a discharging switch V, a loop inductance L, a loop resistance R and a discharging loop switch S2 which are connected in series with the tested capacitor to form a loop. The two ends P1 and P2 of the tested capacitor are test points of current and voltage respectively.
The discharging switch V adopts a thyristor V T . Thyristor V T The silicon rectifier device has the characteristics of a silicon rectifier device, can work under the conditions of high voltage and high current, and can control the working process, and a thyristor is selected for conducting pulse discharge. When the voltage is too high, thyristors can be connected in series, so that the overall voltage-resisting capacity is improved. In fig. 1, in order to increase the turn-off speed of the discharge switch, a freewheeling diode VD is connected in anti-parallel to the thyristor VT to form an inverse thyristor, so that the inverse thyristor has the excellent performances of high voltage resistance, high temperature resistance, short turn-off time, low on-state voltage and the like, the turn-off time is only a few microseconds, and the working frequency is tens of kilohertz.
The utility model relates to a life test method of a high-voltage repetition frequency pulse capacitor, which comprises the following steps.
Firstly, a capacitor to be tested is charged to a set voltage U0, a charging switch S1 is disconnected, a discharging loop switch S2 is closed, and then a thyristor is conducted in a pulse discharging mode to start testing work; as shown in fig. 2, in order to test the loop schematic diagram, the inductance value of the loop inductance L is L, the resistance value of the loop resistance R is R, and the capacitance value of the measured capacitor C is C.
The thyristor on time t is set to 0, the current is zero at the moment 0, and the starting voltage Uc (0) and the starting current iL (0) are respectively:
Uc(0)＝U0，
iL(0)＝0；
the discharge loop equation after closing the switch is:
order theThe equation feature root is:
the loop parameters are selected according to different loads under the actual working conditions, and after the loop parameters are changed, the pulse discharge waveform is changed, and the conditions are divided into 3 conditions:
(1) Over-damping condition: adjusting the parameters so thatI.e. a > omega 0 The characteristic roots p1 and p2 are non-equal negative real roots, and the discharge current expression is as follows:
(2) Critical damping situation
Adjusting loop parameters such thata＝ω 0 The characteristic roots p1 and p2 are equal negative real roots. The discharge current expression is:
(3) Under-damped condition
Adjusting loop parameters such thata<ω 0 The characteristic roots p1 and p2 are conjugate complex roots with negative real parts, and the pulse discharge current expression is:
by the loop arrangement of fig. 2, the parameter adjustment is performed, so that an arbitrary waveform under the pulse condition can be obtained, and the life test can be performed, and meanwhile, under the test condition of trial production of a large number of repetition frequency pulse capacitors, the life test of the repetition frequency pulse capacitors in batches can be satisfied, so that the efficiency of the test process is improved.
The capacitor discharging process of the utility model needs to control the conduction of the switches synchronously or one by one so as to ensure the state detection of each pulse capacitor. The capacitors are connected in parallel, and the pulse power switch is used for controlling, so that the test efficiency of the capacitors can be greatly improved.
When the life characteristics of the pulse capacitor under special conditions need to be tested, proper equipment needs to be added in the loop to meet the test requirements. If the life characteristics of the pulse capacitor under different temperature or humidity environments are tested, the pulse capacitor can be placed in a constant temperature and humidity box, and the pulse capacitor is connected into a loop through a wire for life test.
The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same according to the content of the present utility model, and are not intended to limit the scope of the present utility model. All modifications made according to the spirit of the main technical proposal of the utility model should be covered in the protection scope of the utility model.
Claims (5)
1. The life testing device of the high-voltage repetition frequency pulse capacitor is characterized by comprising a charging loop and a discharging loop, wherein the charging loop charges a tested capacitor C, and the discharging loop comprises a discharging switch V, a loop inductance L and a loop resistance R which are connected in series with the tested capacitor C to form a loop;
the number of the tested capacitors C is multiple, the tested capacitors are respectively connected in parallel, and each parallel branch is connected with a pulse power switch in series.
2. The life testing device of the high-voltage repetition frequency pulse capacitor according to claim 1, further comprising a current-voltage monitoring module and a control module, wherein the current-voltage monitoring module is used for detecting the current and the voltage of the tested capacitor C, and the control module is connected with the control switch to control the closing of the discharge switch V.
3. The life test device of the high-voltage repetition frequency pulse capacitor according to claim 2, wherein the discharge switch V adopts a thyristor.
4. The life testing device of the high-voltage repetition frequency pulse capacitor according to claim 3, wherein the number of the thyristors is multiple, the thyristors are sequentially connected in series, and the voltage endurance capacity is increased.
5. The high-voltage repetition frequency pulse capacitor life testing device according to claim 1, wherein the charging loop comprises a charging power supply, a charging resistor RL and a charging switch S1 connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321621426.XU CN220357191U (en) | 2023-06-26 | 2023-06-26 | High-voltage repetition frequency pulse capacitor life testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321621426.XU CN220357191U (en) | 2023-06-26 | 2023-06-26 | High-voltage repetition frequency pulse capacitor life testing device |
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| CN220357191U true CN220357191U (en) | 2024-01-16 |
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| CN202321621426.XU Active CN220357191U (en) | 2023-06-26 | 2023-06-26 | High-voltage repetition frequency pulse capacitor life testing device |
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2023
- 2023-06-26 CN CN202321621426.XU patent/CN220357191U/en active Active
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