CN214225312U - Device for improving current surge test efficiency of capacitor - Google Patents
Device for improving current surge test efficiency of capacitor Download PDFInfo
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- CN214225312U CN214225312U CN202120072828.3U CN202120072828U CN214225312U CN 214225312 U CN214225312 U CN 214225312U CN 202120072828 U CN202120072828 U CN 202120072828U CN 214225312 U CN214225312 U CN 214225312U
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Abstract
The utility model provides an improve device of electric current surge test efficiency of electric capacity, the circuit includes: the power supply comprises a direct current power supply, a surge power supply and a plurality of capacitors connected in parallel; a first switch is arranged on a first circuit of each capacitor connected with the surge power supply, and a second switch is arranged on a second circuit connected with the direct-current power supply; a first switch of a capacitor opens after closing for a first time period: while open, the second switch of this capacitor is closed and opened after a second duration; after the interval duration of disconnection, the first switch of the next capacitor is closed and disconnected after the first duration; each capacitor in the current surge test circuit is subjected to the processes of closing and opening of the first switch and the second switch, so that each capacitor is charged by the surge power supply and the direct current power supply. The utility model discloses satisfy high-quality electric current surge test with the low cost, greatly reduced the manufacturing cost of electric capacity.
Description
Technical Field
The utility model relates to a current detection technical field especially relates to a device of electric current surge test efficiency of improvement electric capacity.
Background
The current surge device is commonly used for carrying out surge tests on capacitor products, generally needs lower internal resistance of a discharge loop (less than 1 omega, such as 0.4 omega), shorter current rise time (less than 10uS, such as 4-5 uS), and can measure a current peak value (the current peak value is 10A-200A) and a current reduction curve. The surge power supply is generally a power supply for charging a group of high-capacity energy storage capacitors, and the energy storage capacitors are connected with a capacitor to be tested through a discharge switch, so that a surge discharge loop is formed by the energy storage capacitors and the capacitor to be tested.
When the discharge switch is switched on, the energy storage capacitor quickly discharges to the capacitor to be measured to form a current surge peak value (usually from a few amperes to more than hundreds of amperes), then the current rapidly drops, usually after 10mS, the current reaches a few mA level, and the capacitor to be measured is fully charged. At this point the current will drop to the order of 1mA or even lower. The surge current device is required to measure not only the peak value (10A to 200A) of the surge current, but also the current below mA after the capacitor is charged fully, namely the measurement range of the current is required to be large, and the dynamic range of the current is different by more than tens of thousands of times. At present, current surge technology and devices capable of achieving the measurement requirements in the current surge process exist, but the cost of the device with complete functions is extremely high.
In the prior art, in the specification of the current surge test, the charging time required by the current surge test is generally required to be more than 1s, and the discharging time is required to be more than 1s, namely, at least 2s is required for one cycle of each current surge test. If 10 surge cycles are required, 20s are required. In mass production, each capacitor needs 20s to carry out the current surge test, and the efficiency is extremely low. If a plurality of current surge devices are adopted to carry out parallel current surge tests on a plurality of capacitors, the efficiency can be improved in multiples, but the overall production cost is also increased in multiples.
In the prior art, a plurality of current surge devices are generally adopted to improve efficiency no matter a production test is carried out at normal temperature or in a high-low temperature environment. Each current surge device is only used for testing one capacitor, and a method of simultaneously testing a plurality of capacitors in parallel is adopted, so that the effect of improving the efficiency by multiple times is achieved. However, the cost required by the method is high, and the requirement of low cost is not met. In order to reduce the cost, some prior art adopts a simplified device for reducing the surge current measurement performance. This is a cost control obtained at the expense of critical performance and does not meet the requirements for high performance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an improve device of electric current surge test efficiency of electric capacity, satisfy high-quality electric current surge test with the low cost, greatly reduced the manufacturing cost of electric capacity.
Particularly, the utility model provides an improve device of electric current surge test efficiency of electric capacity, a set of electric current surge test circuit includes: the power supply comprises a direct current power supply, a surge power supply and a plurality of capacitors connected in parallel; each capacitor is respectively connected to the surge power supply and the direct-current power supply through two independent circuits, a first switch is arranged on a first circuit connected with the surge power supply, and a second switch is arranged on a second circuit connected with the direct-current power supply;
the surge power supply independently provides surge current for each capacitor in a time-sharing switching mode, and the direct current power supply provides direct current power supply for each capacitor which is subjected to surge charging; the first switch of one capacitor opens after closing for a first time period: while open, the second switch of this capacitor is closed and opened after a second duration; after the interval duration of disconnection, the first switch of the next capacitor is closed and disconnected after the first duration;
each capacitor in the current surge test circuit is subjected to the processes of closing and opening of the first switch and the second switch.
Preferably, a set of current surge test circuits further includes: a plurality of resistors; each capacitor is connected with one resistor through an independent third circuit, and the third circuit is provided with a third switch; the second switch of a capacitor is opened after being closed for a second period of time, while the third switch of the capacitor is closed and opened after a third period of time to discharge the capacitor.
Preferably, the range of the first duration is 10ms to 100ms, the range of the second duration is 990ms to 900ms, the third duration is the sum of the first duration and the second duration, and the interval duration is greater than or equal to 20 ms.
Preferably, in the current surge test circuit, after the third switch of the first capacitor is closed for a third time and then is opened, a complete charging and discharging cycle is completed; and simultaneously, closing the first switch of the first capacitor again and starting the next charge-discharge period.
Preferably, the number of charge and discharge cycles per capacitor is at least 10.
The utility model discloses a device for improving the current surge test efficiency of capacitors, because only one surge power supply and one DC power supply are needed, the surge power supply provides current surge impact for a plurality of capacitors by a time-sharing switching method, namely, a full-function current surge source is shared by a plurality of capacitors in a group in a time-sharing manner; one DC power supply can also correspond to a plurality of groups of capacitors and can provide DC power supply for more capacitors at the same time. Therefore, the utility model discloses a device can be under limited cost, and the multiplicates promote the electric current surge test efficiency of electric capacity.
Further, the direct current power supply has an output current limiting function. The current limiting value can be set in a close fit manner according to the actual charging current (usually in the range of 1 mA-50 mA, which is determined by the residual capacity to be charged of the capacitor to be measured after the surge power supply is charged), but the current limiting value must be higher than the actual charging current value. The current limiting function can protect a power supply when the capacitor is in failure and short circuit, and can inhibit the capacitor from short circuit explosion, so that the possibility of explosion of the defective capacitor in the current surge test process is reduced, and the capacitor tool clamp capable of well protecting the current surge is not damaged by the capacitor explosion.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a partial flow chart of a method of high capacitance current surge test efficiency of the present invention;
fig. 2 is a schematic circuit diagram for improving the efficiency of a current surge test of a capacitor according to an embodiment of the present invention.
Detailed Description
The utility model discloses a carry out the mode of electric current surge test to a plurality of electric capacity. The method is characterized in that the current surge test time of each capacitor is divided into two stages, and two power supplies with current limit values are respectively provided for the capacitors in the two stages, wherein one is a full-function current surge source, and the other is a conventional direct-current power supply. The current surge source only uses one capacitor to test a group of capacitors, and uses a time-sharing switching method to provide current surge impact for the capacitors, namely, a full-function current surge source is shared by the capacitors in the group in a time-sharing manner. The direct current power supply also uses one capacitor, can correspond to a plurality of groups of capacitors, and can provide the direct current power supply for more capacitors at the same time, because each capacitor only needs smaller current in the later charging period. After the surge test is carried out on each capacitor, each capacitor can be connected with a discharge resistor for discharging.
Therefore, the utility model discloses a device, its electric current surge test circuit includes: the power supply comprises a direct current power supply, a surge power supply, a plurality of resistors and a plurality of capacitors connected in parallel. Each resistor corresponds to a capacitor. Each capacitor has three independent circuits. A first circuit of a capacitor is connected to a surge power supply, and a first switch is arranged on the first circuit; the second circuit is connected to the direct current power supply, and a second switch is arranged on the second circuit; the third circuit is connected to the resistor, and a third switch is provided on the third circuit. That is, each capacitor is connected with three gating switches, and the surge power supply, the direct current power supply or the discharge resistor can be switched on selectively. The gating switch is a power MOS switching device, and the switching speed of the gating switch is far higher than that of an IGBT.
Three time periods of the same capacitance are described below.
The first time period is a current surge applying stage for the capacitor, and comprises a large-current surge impact process in a range of 10A to 200A for the capacitor, and the main impact process is mainly concentrated in the first 100 us. The utility model discloses the time length of the first stage of arrangement, it is 10ms ~ 100ms when first promptly. The range of the first time length is selected to include not only the main current surge part but also the buffer part waiting for the current to be reduced to a low enough stage to drop out the surge power supply. During a first time period, a first switch of the capacitor is closed, the surge power supply charges the capacitor for a first time period, and then the first switch is opened.
The time length selection principle of the surge power supply is as follows: after the capacitor is connected with a surge source, the current surge can quickly reach a peak value only by about 10us, the peak current is the voltage of the surge discharge source divided by the internal resistance of a discharge loop (usually about 1 omega), and the current peak value is usually about 10A-200A; then the current is rapidly reduced, the normal capacitance is reduced to less than 95% of the peak value at about 100us, namely less than 99% at 10ms, and then the leakage current value of the capacitance is slowly approached, namely about 100ms to less than 99.9%.
The second time period is to apply the direct current voltage to the capacitor in the later period of the current surge to continue charging. The starting time of the charging of the direct current power supply is the ending time of the first time period. That is, after the first switch is turned off, the dc power supply supplies the dc power to the capacitor for charging for a second duration while turning off until the required current surge charging time (typically 1000mS is required) is over, and then the second switch is turned off.
The time length selection principle of the direct current power supply is as follows: in the second stage, a conventional direct current power supply is selected, and the voltage is the whole-process fixed voltage required by the current surge. At this time, the capacitor is charged with more than 99% of the charge, and the charging current is also reduced to a level of several tens of mA to several mA. The direct current power supply has an output current limiting function, and the current limiting value can be set in a close fit manner according to the actual charging current (generally, the range is 1 mA-50 mA, and is determined by the residual capacity to be charged of the capacitor to be detected after the surge power supply is charged), but the current limiting value is higher than the actual charging current value. The current limiting function can protect a power supply when the capacitor is failed and short-circuited, and can inhibit the capacitor from short-circuit explosion, so that the capacitor tooling clamp with current surge can be well protected from being damaged due to the capacitor explosion.
The third time period is the discharge phase of the capacitor. At this time, the second switch is opened and the third switch of the capacitor is closed, so that the capacitor discharges the resistor in the third circuit for a third duration. Typically, the third duration is selected as the sum of the first duration and the second duration. The first time length ranges from 10ms to 100ms, and the second time length ranges from 990ms to 900 ms. If the first time period is selected to be 10ms and the second time period is selected to be 990ms, the third time period is 1000ms to ensure sufficient consumption of the capacitor.
The charging and discharging of the plurality of capacitors connected in parallel will be described in detail below. Because the surge power supply is very short when charging to every electric capacity, the utility model discloses a method that the timesharing switched has utilized surge power supply fully.
The plurality of capacitors are arranged in sequence. After a first switch of the first capacitor is closed, the surge power supply charges the first capacitor for a first duration, and then is turned off. After the interval duration that the first switch of the first capacitor is opened, the first switch of the second capacitor is closed, the surge power supply charges the second capacitor for the first duration, and then the second capacitor is opened. … … after the interval time that the first switch of the nth capacitor is opened, the first switch of the (n + 1) th capacitor is closed, the surge power supply charges the (n + 1) th capacitor for the first time period, and then is opened. In the process, the first switch of each capacitor is opened, and the corresponding second switch is closed, so that the direct current power supply supplies power to the capacitor. Thus, at the same time, the surge power supply serves only one capacitor, while the dc power supply needs to serve all capacitors in parallel in multiple or even in a circuit.
The interval duration is greater than the first duration. In the interval duration, the surge power supply does not discharge outwards, and a large-capacity energy storage capacitor in the surge power supply is fully charged in the surge power supply. If the first time period is selected to be 10ms, the interval time period may be selected to be equal to or greater than 20 ms.
Each capacitor in the current surge test circuit is subjected to the processes of closing and opening of the first switch and the second switch, so that each capacitor is charged by the surge power supply and the direct current power supply. Each capacitor also goes through the process of closing and opening its third switch so that each capacitor is fully discharged.
The charge-discharge of the three time quantum of the same electric capacity of above-mentioned description, a plurality of parallelly connected electric capacity all belongs to the utility model discloses a charge-discharge cycle of electric current surge test circuit. A capacitor may require at least 10 charge-discharge cycles. After the third switch of the first capacitor is turned off, that is, after the charge-discharge period of the first capacitor is completed, the first switch of the first capacitor is turned on again, and the first capacitor is turned on for the next charge-discharge period … … until all the capacitors meet the number of the charge-discharge periods, so that the current surge test of the device is finished.
In summary, as shown in fig. 1, a flow chart of a method for improving the efficiency of the current surge test of the capacitor is taken as an example of a charging cycle of the current surge test circuit of the present invention. Initially, the first capacitor charge n is 1.
S1, closing a first switch of the capacitor n to enable the surge power supply to charge the capacitor n;
s2: judging whether the closing time of the first switch of the capacitor n reaches a first time, if so, performing S3, and if not, continuing to charge the capacitor n by the surge power supply;
s3, disconnecting the first switch of the capacitor n, and respectively carrying out S4a and S4 b;
s4 a: when the capacitor n is disconnected, the second switch of the capacitor n is closed, so that the direct-current power supply charges the capacitor n, and the second switch of the capacitor n is disconnected after a second time period;
s4 b: judging whether the capacitor n is the last capacitor of the sequence, if so, ending the circulation, and if not, performing S5 b;
s5 b: after the open interval, the capacitor n-n +1 is charged back to S1 until each capacitor in the circuit has gone through the process of closing and opening its first switch.
S1 to S4a show the charging process of the capacitor n, and after S4a, there is the discharging process of the capacitor n. S5 a: after the second switch of the capacitor n is turned off, the third switch of the capacitor n is turned off and is turned off after a third time period while the second switch of the capacitor n is turned off, so that the capacitor n is discharged.
As shown in fig. 1, one embodiment is provided. In the figure, 4 capacitors are used as a group and share one surge power supply and one direct current power supply. Each capacitor is connected with a surge power supply and a direct current power supply through a switch K1 and a switch K2 respectively to form a current surge charging loop and a direct current steady-state charging loop respectively; the other switch K3 is connected with a discharge resistor to form a discharge loop.
When the surge is started, the current surge switch K1-1 of the capacitor C1 is connected with a surge power supply for 10mS or 100 mS. K1-1 is then turned off, K1-2 is then turned on immediately, and the capacitor is turned on to the DC power supply to continue charging capacitor C1.
After at least 20mS of power switching of the C1 occurs, the K2-1 of the capacitor C2 is powered on for the same duration as the C1 is powered on for the surge power. Then K2-1 is turned off, K2-2 is turned on immediately, and C2 also turns on the DC power supply to continue charging C2. At this time, the dc charging time of C1 is not yet over, the charging lasts only about 100mS (or less, depending on the specific time length of the 1 surge period), and the charging is still continued (the surge period + dc charging period is at least equal to 1000 mS).
By the time that the C3 starts the surge period to the end and starts the dc charging, the C1 has continued the dc charging for two surge periods, the C2 has continued the dc charging for one surge period, the C3 has just started the dc charging, and then the C4 starts the surge period. When the C4 starts to perform DC charging, the total charging time of the C1 is not more than 1000mS, and the DC power supply performs DC charging on the four capacitors at the same time until the DC charging time of the C1 is the first time.
At this time, K1-2 of C1 was turned off, K1-3 was turned on, and C1 began discharging for 1000 mS. Shortly after the C1 time, C2 time also expired, and K-3 also began the discharge phase for 1000mS until C3 and C4 successively began the discharge phase, at which time the four capacitors were all in the discharge phase. And ending the first charge and discharge period of the whole surge test until C1 is first, then starting the charge and discharge period of the second surge test, and starting the second test period of the capacitor by other capacitors. Such process is repeated 10 times, and every electric capacity has just accomplished 10 times current surge test, and the test process of four electric capacities has been accomplished in total time about 20 seconds, and is equivalent with the total time of doing the surge test for four electric capacities simultaneously with four surge sources among the prior art, nevertheless the utility model discloses surge power supply has only used one.
To sum up, the utility model discloses a device for improving the efficiency of the current surge test of the capacitor, because only need a surge power supply and a DC power supply, a surge power supply provides the current surge impact for a plurality of capacitors by the method of time-sharing switching, namely a full-function current surge source is shared by a plurality of capacitors in a group in a time-sharing manner; one DC power supply can also correspond to a plurality of groups of capacitors and can provide DC power supply for more capacitors at the same time. Therefore, the utility model discloses a device can be under limited cost, and the multiplicates promote the electric current surge test efficiency of electric capacity.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.
Claims (5)
1. A device for improving the current surge test efficiency of a capacitor is characterized in that,
a set of current surge test circuits includes: the power supply comprises a direct current power supply, a surge power supply and a plurality of capacitors connected in parallel; each capacitor is respectively connected to the surge power supply and the direct-current power supply through two independent circuits, a first switch is arranged on a first circuit connected with the surge power supply, and a second switch is arranged on a second circuit connected with the direct-current power supply;
the surge power supply independently provides surge current for each capacitor in a time-sharing switching mode, and the direct current power supply provides direct current power supply for each capacitor which is subjected to surge charging; the first switch of one capacitor opens after closing for a first time period: while open, the second switch of this capacitor is closed and opened after a second duration; after the interval duration of disconnection, the first switch of the next capacitor is closed and disconnected after the first duration;
each capacitor in the current surge test circuit is subjected to the processes of closing and opening of the first switch and the second switch.
2. The apparatus for improving the efficiency of current surge testing of a capacitor of claim 1, wherein a set of current surge testing circuits further comprises: a plurality of resistors; each capacitor is connected with one resistor through an independent third circuit, and the third circuit is provided with a third switch; the second switch of a capacitor is opened after being closed for a second period of time, while the third switch of the capacitor is closed and opened after a third period of time to discharge the capacitor.
3. The apparatus of claim 2, wherein the first time period ranges from 10ms to 100ms, the second time period ranges from 990ms to 900ms, the third time period is the sum of the first time period and the second time period, and the interval time period is greater than or equal to 20 ms.
4. The device for improving the current surge test efficiency of the capacitor according to claim 2 or 3, wherein in the current surge test circuit, after the third switch of the first capacitor is closed for a third time and then is opened, a complete charge-discharge cycle is completed; and simultaneously, closing the first switch of the first capacitor again and starting the next charge-discharge period.
5. The apparatus of claim 4, wherein each capacitor has at least 10 cycles of charging and discharging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120072828.3U CN214225312U (en) | 2021-01-12 | 2021-01-12 | Device for improving current surge test efficiency of capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120072828.3U CN214225312U (en) | 2021-01-12 | 2021-01-12 | Device for improving current surge test efficiency of capacitor |
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| CN214225312U true CN214225312U (en) | 2021-09-17 |
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| CN202120072828.3U Active CN214225312U (en) | 2021-01-12 | 2021-01-12 | Device for improving current surge test efficiency of capacitor |
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Address after: 214000 East 1st Half of Workshop and 6th Floor of Auxiliary Building, Building D, No. 503, Dadong Road, Wuxi Economic Development Zone, Jiangsu Province Patentee after: JIANGSU EEEST ADVANCED TECHNOLOGY Co.,Ltd. Address before: Block E-4, building C, international science and technology cooperation Park, 2 Taishan Road, New District, Wuxi City, Jiangsu Province, 214000 Patentee before: JIANGSU EEEST ADVANCED TECHNOLOGY Co.,Ltd. |