CN218331929U - Capacitor ESL measuring circuit - Google Patents
Capacitor ESL measuring circuit Download PDFInfo
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- CN218331929U CN218331929U CN202221903807.2U CN202221903807U CN218331929U CN 218331929 U CN218331929 U CN 218331929U CN 202221903807 U CN202221903807 U CN 202221903807U CN 218331929 U CN218331929 U CN 218331929U
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Abstract
The utility model discloses a capacitor ESL measuring circuit, which is used for measuring a capacitor to be measured and comprises a controller (1), an isolation transformer (3), a double-pulse circuit board (4) and a direct current source (2) connected with a power supply; the direct current source (2) is connected with a discharge resistor (5), a capacitor to be tested (6) and a universal meter (7) in parallel through a circuit, a first switch (8) is arranged on a connecting circuit of the direct current source (2) and the capacitor to be tested (6), and a second switch (9) is arranged on a connecting circuit of the capacitor to be tested (6) and the discharge resistor (5); the isolation transformer (3) is connected with an oscilloscope (10), the oscilloscope (10) is connected with a half-bridge circuit board (11), and the half-bridge circuit board (11) is respectively connected with the capacitor (6) to be tested and the double-pulse circuit board (4); the utility model discloses can effectively improve the measuring frequency of condenser inductance, have simultaneously and influenced little and the high characteristics of measuring accuracy by the voltage.
Description
Technical Field
The utility model relates to a measure technical field, in particular to condenser ESL measuring circuit.
Background
At present, the extraction method of capacitor ESL (Equivalent Series Inductance) can be mainly divided into two types, namely short-circuit discharge method and impedance analyzer frequency sweep. The short-circuit discharge method is difficult to eliminate stray inductance in a test loop, so that an ESL (electronic shelf life) measurement result is higher, the oscillation frequency in the test process is lower, the difference between the ESL measurement result and high-frequency characteristics corresponding to device switching actions in the actual operation working condition of the capacitor is larger in magnitude, and the reference significance of the measurement result is low. The current solution to the above problems is to use a high sampling rate oscilloscope or a high precision impedance analyzer, but the high sampling rate oscilloscope has high requirements for the operating environment, and is subject to the bandwidth of current probes, and the synchronization among multiple groups of voltage and current probes; when the high-precision impedance analyzer performs frequency sweep test on the capacitor, the impedance analyzer has large interference on the measurement result in the aspects of measuring the angle, tightness, correction and the like of the clamp, so the accuracy of the measurement result is not ideal.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a condenser ESL measuring circuit. The utility model discloses can effectively improve the measuring frequency of condenser inductance, have simultaneously and influence characteristics little and that measurement accuracy is high by the voltage.
The technical scheme of the utility model: a capacitor ESL measuring circuit is used for measuring a capacitor to be measured and comprises a controller, an isolation transformer, a double-pulse circuit board and a direct current source connected with a power supply; the direct current source is connected with a discharge resistor, a capacitor to be tested and a universal meter in parallel through a circuit, a first switch is arranged on a connecting circuit of the direct current source and the capacitor to be tested, and a second switch is arranged on a connecting circuit of the capacitor to be tested and the discharge resistor; the isolation transformer is connected with an oscilloscope, the oscilloscope is connected with a half-bridge circuit board, and the half-bridge circuit board is respectively connected with the capacitor to be tested and the double-pulse circuit board; the controller is connected with the oscilloscope, the direct current source and the double-pulse circuit board.
In the capacitor ESL measuring circuit, a connecting plate connected with the capacitor to be measured and the half-bridge circuit board is arranged between the capacitor to be measured and the half-bridge circuit board.
In the aforementioned capacitor ESL measurement circuit, the half-bridge circuit board is connected to the double-pulse circuit board via a flat cable.
In the aforementioned capacitor ESL measurement circuit, the controller is connected to the dc source and the double pulse circuit board via a serial line.
In the aforementioned capacitor ESL measurement circuit, the controller is connected to the oscilloscope via a network cable.
In the foregoing capacitor ESL measurement circuit, the first switch and the second switch are air switches.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model comprises a controller, an isolation transformer, a double-pulse circuit board and a direct current source connected with a power supply; the direct current source is connected with a discharge resistor, a capacitor to be tested and a universal meter in parallel through a circuit, a first switch is arranged on a connecting circuit of the direct current source and the capacitor to be tested, and a second switch is arranged on a connecting circuit of the capacitor to be tested and the discharge resistor; the isolation transformer is connected with an oscilloscope, the oscilloscope is connected with a half-bridge circuit board, and the half-bridge circuit board is respectively connected with a capacitor to be tested and a double-pulse circuit board; the controller is connected with the oscilloscope, the direct current source and the double-pulse circuit board; closing the first switch, opening a direct current source to charge the capacitor to be tested, disconnecting the first switch and closing the direct current source after the charging is finished, enabling the dipulse circuit board to output dipulse signals through the controller, realizing level conversion after the dipulse signals reach the half-bridge circuit board, further exciting the capacitor to be tested and the half-bridge circuit board to generate high-frequency oscillation, and capturing data such as frequency information in the process by an oscilloscope to obtain stray inductance of the capacitor to be tested; the utility model discloses a high frequency oscillation can improve the measuring frequency of the capacitor inductance that awaits measuring by a wide margin, and oscillation frequency receives that voltage influences for a short time and the uniformity is good, need not high sampling rate oscilloscope, no longer receives the restriction in the current probe bandwidth to and the synchronous scheduling problem between multiunit voltage, current probe, the variable figure of participating in the calculation reduces, thereby makes measuring accuracy and efficiency obtain promoting by a wide margin.
2. The utility model discloses be equipped with the connecting plate that links to each other with both between capacitor to be measured and the half-bridge circuit board, can directly set up capacitor to be measured and make it be connected with the half-bridge circuit board on the connecting plate, and need not manually to carry out line connection, effectively promote the convenience of use.
3. The utility model discloses first switch and second switch are air switch, and air switch can protect the short circuit that circuit or electrical equipment took place, serious overload and undervoltage etc. effectively promote the reliability in the use.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The labels in the figures are: 1-a controller; 2-a direct current source; 3-isolating the transformer; 4-double pulse circuit board; 5-discharge resistance; 6-capacitor to be tested; 7-a universal meter; 8-a first switch; 9-a second switch; 10-an oscilloscope; 11-a half-bridge circuit board; 12-connecting plate.
Detailed Description
The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.
The embodiment is as follows: a kind of capacitor ESL measuring circuit, is used for measuring the capacitor to be measured, as shown in figure 1, this circuit includes the controller 1, the isolating transformer 3, the double pulse circuit board 4 and direct current source 2 linking with power; the direct current source 2 is connected with a discharge resistor 5, a capacitor 6 to be tested and a universal meter 7 in parallel through a circuit, the universal meter is used for monitoring whether voltage exists at two ends of the capacitor to be tested, a first switch 8 is arranged on a connecting circuit of the direct current source 2 and the capacitor 6 to be tested, and a second switch 9 is arranged on a connecting circuit of the capacitor 6 to be tested and the discharge resistor 5; the isolation transformer 3 is connected with an oscilloscope 10, the oscilloscope 10 is connected with a half-bridge circuit board 11, the isolation transformer 3 is electrically connected with the oscilloscope, two channels of the oscilloscope are connected with the half-bridge circuit board through a sampling probe, the sampling probe acquires a voltage waveform to extract frequency information of high-frequency oscillation, the half-bridge circuit board 11 is respectively connected with a capacitor 6 to be tested and a double-pulse circuit board 4, an ARM control board is arranged on the double-pulse circuit board and can send out double pulses with the low level of 0V and the high level of 3.3V, the double pulses are subjected to level conversion through a power module on the double-pulse circuit board, the low level of the double pulses is pulled down to-4V, and the high level of the double pulses is pulled up to 15V, so that SiC MOSFET on the half-bridge circuit board can be driven; in the half-bridge circuit board, a lower tube SiC MOSFET performs switching action under the driving action of double pulses after level conversion, so that a loop is excited to generate high-frequency oscillation; the controller 1 is connected with the oscilloscope 10, the direct current source 2 and the double-pulse circuit board 4; a connecting plate 12 connected with the capacitor 6 to be tested and the half-bridge circuit board 11 is arranged between the two; the half-bridge circuit board 11 is connected with the double-pulse circuit board 4 through a flat cable; the controller 1 is connected with a direct current source 2 and a double-pulse circuit board 4 through a serial port line; the controller 1 is connected with an oscilloscope 10 through a network cable; the first switch 8 and the second switch 9 are air switches.
The working principle is as follows: the capacitor to be tested is arranged on the connecting plate through a screw, the first switch is closed, the direct current source is opened to charge the capacitor to be tested, the first switch is disconnected and the direct current source is closed after charging is finished, the double-pulse circuit board outputs a double-pulse signal through the controller, level conversion is realized after the double-pulse signal reaches the half-bridge circuit board, the capacitor to be tested and the half-bridge circuit board are further excited to generate high-frequency oscillation, the oscilloscope captures data such as frequency information in the process and obtains stray inductance of the capacitor to be tested, the second switch is closed to discharge the capacitor to be tested after measurement is finished, and the second switch is disconnected after discharge is finished.
Claims (6)
1. A capacitor ESL measuring circuit is used for measuring a capacitor to be measured, and is characterized in that: the circuit comprises a controller (1), an isolation transformer (3), a double-pulse circuit board (4) and a direct current source (2) connected with a power supply; the direct current source (2) is connected with a discharge resistor (5), a capacitor to be tested (6) and a universal meter (7) in parallel through a circuit, a first switch (8) is arranged on a connecting circuit of the direct current source (2) and the capacitor to be tested (6), and a second switch (9) is arranged on a connecting circuit of the capacitor to be tested (6) and the discharge resistor (5); the isolation transformer (3) is connected with an oscilloscope (10), the oscilloscope (10) is connected with a half-bridge circuit board (11), and the half-bridge circuit board (11) is respectively connected with the capacitor (6) to be tested and the double-pulse circuit board (4); the controller (1) is connected with the oscilloscope (10), the direct current source (2) and the double-pulse circuit board (4).
2. The capacitor ESL measurement circuit of claim 1, wherein: and a connecting plate (12) connected with the capacitor (6) to be tested and the half-bridge circuit board (11) is arranged between the two.
3. The capacitor ESL measurement circuit of claim 1, wherein: the half-bridge circuit board (11) is connected with the double-pulse circuit board (4) through flat cables.
4. The capacitor ESL measurement circuit of claim 1, wherein: the controller (1) is connected with the direct current source (2) and the double-pulse circuit board (4) through serial port lines.
5. The capacitor ESL measurement circuit of claim 1, wherein: the controller (1) is connected with the oscilloscope (10) through a network cable.
6. The capacitor ESL measurement circuit of claim 1, wherein: the first switch (8) and the second switch (9) are air switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221903807.2U CN218331929U (en) | 2022-07-22 | 2022-07-22 | Capacitor ESL measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221903807.2U CN218331929U (en) | 2022-07-22 | 2022-07-22 | Capacitor ESL measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218331929U true CN218331929U (en) | 2023-01-17 |
Family
ID=84872834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221903807.2U Active CN218331929U (en) | 2022-07-22 | 2022-07-22 | Capacitor ESL measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218331929U (en) |
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2022
- 2022-07-22 CN CN202221903807.2U patent/CN218331929U/en active Active
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