CN114184921A - Capacitance detection method and device under high pulse voltage and different working temperatures - Google Patents
Capacitance detection method and device under high pulse voltage and different working temperatures Download PDFInfo
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Abstract
The invention relates to the field of capacitance detection, in particular to a capacitance detection method and device under high pulse voltage and different working temperatures. The method and the device charge the energy storage capacitor through the direct-current high voltage of the high-voltage direct-current power supply, chop the direct-current high voltage output by the energy storage capacitor into pulse voltage, increase the pulse voltage to high pulse voltage and transmit the pulse voltage to the capacitor to be tested, obtain the capacitance characteristics of the capacitor to be tested under the conditions of high pulse voltage and different working temperatures by changing the working temperature of the capacitor to be tested, and can meet the capacitance testing requirements under the conditions of high pulse voltage and different working temperatures.
Description
Technical Field
The invention relates to the field of capacitance detection, in particular to a capacitance detection method and device under high pulse voltage and different working temperatures.
Background
In the field of laser power supplies, a high-voltage ceramic capacitor is used as a core electronic device, and works under a high-pulse voltage condition of dozens of kilovolts, wherein the pulse width is several microseconds to dozens of nanoseconds during working. Due to the lack of capacitance measurement techniques under such conditions, systematic studies and experiments on the capacitance characteristics of such capacitors under various operating conditions have not been possible. Therefore, the actual capacitance characteristics of the capacitors of different batches and manufacturers under the working condition and the parameters at different working temperatures cannot be determined, so that the consistency of the product is restricted to a great extent, and the product normalization, improvement and improvement are not facilitated.
Disclosure of Invention
The embodiment of the invention provides a capacitance detection method and a capacitance detection device under high pulse voltage and different working temperatures, and at least solves the technical problem that the conventional test method in the prior art cannot detect the capacitance characteristics of a capacitor under high pulse voltage and different working temperatures.
According to an embodiment of the present invention, there is provided a capacitance detection method at a high pulse voltage and different operating temperatures, including the following steps:
charging the energy storage capacitor through the direct current high voltage of the high-voltage direct current power supply;
chopping the direct-current high voltage output by the energy storage capacitor into pulse voltage;
raising the pulse voltage to a high pulse voltage and transmitting the high pulse voltage to the capacitor to be tested;
and changing the working temperature of the measured capacitor to obtain the capacitance characteristics of the measured capacitor under high pulse voltage and different working temperatures.
Further, the method specifically comprises the following steps:
charging the energy storage capacitor through the kilovolt direct current high voltage of the high voltage direct current power supply;
chopping the kilovolt direct current high voltage output by the energy storage capacitor into kilovolt pulse voltage;
raising the kilovolt pulse voltage to kilovolt pulse voltage and transmitting the kilovolt pulse voltage to a capacitor to be measured;
and changing the working temperature of the measured capacitor to obtain the capacitance characteristics of the measured capacitor under the pulse voltage of ten thousand volts and different working temperatures.
Further, the capacitance characteristic comprises the change of the capacitance charge-discharge characteristic of the measured capacitor with the temperature under high pulse voltage.
According to another embodiment of the present invention, there is provided a capacitance detection device at a high pulse voltage and different operating temperatures, including:
the high-voltage charging module is used for charging the energy storage capacitor through the direct-current high voltage of the high-voltage direct-current power supply;
the pulse voltage generating module is used for chopping the direct-current high voltage output by the energy storage capacitor into pulse voltage;
the boosting module is used for boosting the pulse voltage to a high pulse voltage and transmitting the high pulse voltage to the capacitor to be tested;
and the test module is used for changing the working temperature of the tested capacitor to obtain the capacitance characteristics of the tested capacitor under high pulse voltage and different working temperatures.
Further, the high-voltage charging module includes: high-voltage DC power supply and energy storage capacitor C1The first power switch device is connected with the first signal generating device; when the first signal generating device drives the first power switch device to be conducted according to the first driving time sequence, the high-voltage direct-current power supply provides kilovolt direct-current voltage to the energy storage capacitor C1And (6) charging.
Further, the pulse voltage generating module includes: the second signal generating device and the second power switch device; when the second signal generating device drives the second power switch device to be conducted according to the second driving time sequence, the direct-current high-voltage generated by the high-voltage charging module is chopped into pulse voltage and the pulse voltage is transmitted to the boosting module.
Further, the boost module includes: a step-up transformer, an insulating medium; the boosting transformer boosts the pulse voltage to kilovolt pulse voltage and provides the pulse voltage to a tested capacitor C2 in the test module, and the boosting transformer is immersed in an insulating medium in the boosting module.
Further, the test module includes: capacitor C to be measured2The testing device comprises a testing probe, a temperature control module, a discharge resistor and an insulating medium; capacitor C to be measured2Receiving the kilovolt-level pulse voltage output by the boosting module, discharging the voltage through a discharging resistor, and obtaining a measured capacitor C2Two ends of the temperature control module are connected with the test probes, and the temperature control module is used for measuring the tested capacitor C after setting different working temperatures2The value of the voltage on;temperature control module and tested capacitor C2The test probe and the discharge resistor are immersed in an insulating medium in the test module.
Further, when the energy storage capacitor C1Capacity value C1>Capacitor C to be measured2Capacity value C2When there is a voltage ratio
Wherein VC2maxFinger-to-be-tested capacitor C2Maximum voltage, VC, charged1The voltage value on the energy storage capacitor, known as the energy storage capacitor C1Through an energy-storage capacitor C1And the measured capacitance C2The ratio of the voltages to the voltage to calculate the capacitance C to be measured2The capacity value of (c).
Further, the high-voltage pulse voltage output by the boosting module is applied to the tested capacitor C through two connecting terminals of the testing module2Charging, testing probe and tested capacitor C2Two test points at two ends are connected to measure the measured capacitance C in real time2Voltage values at both ends; capacitor C to be measured2The output end is connected with the bleeder resistor through two connecting terminals.
According to the capacitance detection method and device under the high pulse voltage and different working temperatures in the embodiment of the invention, firstly, the energy storage capacitor is charged through the direct-current high voltage of the high-voltage direct-current power supply, then the direct-current high voltage output by the energy storage capacitor is chopped into the pulse voltage, then the pulse voltage is increased to the high pulse voltage and is transmitted to the capacitor to be detected, the capacitance characteristics of the capacitor to be detected under the high pulse voltage and different working temperatures are obtained by changing the working temperature of the capacitor to be detected, and the capacitance test requirements under the conditions of the high pulse voltage and different working temperatures can be met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of capacitance detection at high pulse voltage and different operating temperatures in accordance with the present invention;
FIG. 2 is a block diagram of the capacitance detection device of the present invention at a high pulse voltage and different operating temperatures;
FIG. 3 is a schematic diagram of two driving waveforms according to the present invention;
FIG. 4 is a schematic structural diagram of a test module according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a capacitance detection method and a capacitance detection device under high pulse voltage and different working temperatures, and aims to solve the problem that the conventional test method in the prior art cannot detect the capacitance characteristics of a high-voltage ceramic capacitor under high pulse voltage and different working temperatures. The control on the consistency of the capacitance characteristics of the high-voltage ceramic capacitor is limited by a non-corresponding detection method, the standardization and normalization of products are not facilitated, and the selection of capacitors of different manufacturers is also limited.
Example 1
According to an embodiment of the present invention, there is provided a capacitance detection method at a high pulse voltage and different operating temperatures, referring to fig. 1, including the following steps:
s101, charging an energy storage capacitor through the direct current high voltage of a high-voltage direct current power supply;
s102, chopping the direct-current high voltage output by the energy storage capacitor into pulse voltage;
s103, increasing the pulse voltage to a high pulse voltage and transmitting the high pulse voltage to a capacitor to be measured;
and S104, changing the working temperature of the measured capacitor to obtain the capacitance characteristics of the measured capacitor under high pulse voltage and different working temperatures.
According to the capacitance detection method under the high pulse voltage and different working temperatures in the embodiment of the invention, firstly, the energy storage capacitor is charged through the direct-current high voltage of the high-voltage direct-current power supply, then the direct-current high voltage output by the energy storage capacitor is chopped into the pulse voltage, then the pulse voltage is increased to the high pulse voltage and is transmitted to the capacitor to be detected, the capacitance characteristics of the capacitor to be detected under the high pulse voltage and different working temperatures are obtained by changing the working temperature of the capacitor to be detected, and the capacitance test requirements under the conditions of the high pulse voltage and different working temperatures can be met.
The method specifically comprises the following steps:
charging the energy storage capacitor through the kilovolt direct current high voltage of the high voltage direct current power supply;
chopping the kilovolt direct current high voltage output by the energy storage capacitor into kilovolt pulse voltage;
raising the kilovolt pulse voltage to kilovolt pulse voltage and transmitting the kilovolt pulse voltage to a capacitor to be measured;
and changing the working temperature of the measured capacitor to obtain the capacitance characteristics of the measured capacitor under the pulse voltage of ten thousand volts and different working temperatures.
The capacitance characteristic comprises the change of the capacitance charge-discharge characteristic of the measured capacitor with the temperature under high pulse voltage.
Example 2
According to another embodiment of the present invention, there is provided a capacitance detection device at a high pulse voltage and different operating temperatures, referring to fig. 2, including:
the high-voltage charging module is used for charging the energy storage capacitor through the direct-current high voltage of the high-voltage direct-current power supply;
the pulse voltage generating module is used for chopping the direct-current high voltage output by the energy storage capacitor into pulse voltage;
the boosting module is used for boosting the pulse voltage to a high pulse voltage and transmitting the high pulse voltage to the capacitor to be tested;
and the test module is used for changing the working temperature of the tested capacitor to obtain the capacitance characteristics of the tested capacitor under high pulse voltage and different working temperatures.
According to the capacitance detection device under high pulse voltage and different working temperatures in the embodiment of the invention, firstly, the energy storage capacitor is charged through the direct-current high voltage of the high-voltage direct-current power supply, then the direct-current high voltage output by the energy storage capacitor is chopped into pulse voltage, then the pulse voltage is increased to the high pulse voltage and is transmitted to the capacitor to be detected, the capacitance characteristics of the capacitor to be detected under the high pulse voltage and different working temperatures are obtained by changing the working temperature of the capacitor to be detected, and the capacitance test requirements under the conditions of the high pulse voltage and different working temperatures can be met.
The capacitance detection device of the present invention at a high pulse voltage and different operating temperatures will be described in detail with specific examples.
Fig. 2 is a diagram of a capacitance detection device according to the present invention, which includes a high voltage charging module, a pulse voltage generating module, a boosting module, and a testing module, which are connected in sequence. Wherein:
the high-voltage charging module comprises a high-voltage direct-current power supply and an energy storage capacitor C1The first signal generating device and the first power switch device; the high-voltage DC power supply provides a kilovolt DC voltage, and when the first signal generating device drives the first power switch device to conduct according to the driving timing sequence of Drive1 in FIG. 3, the kilovolt DC voltage provided by the high-voltage DC power supply is the energy storage capacitor C1And (6) charging. Energy storage capacitor C1Volume value slightly larger than quiltCapacitance C2And the power switch conduction time of the first power switch device is longer than that of the energy storage capacitor C1The charging time of (c). In the energy storage capacitor C1Turns off the first power switch when the voltage of (c) is maximum.
The pulse voltage generating module comprises a second signal generating device and a second power switch device; the second signal generating device drives the second power switch device to be conducted according to the driving time sequence of Drive2 in fig. 3, and chops the direct-current high voltage generated by the high-voltage charging module into pulse voltage to the step-up transformer; the boosting module comprises a boosting transformer and an insulating medium; the booster transformer boosts the pulse voltage signal to a kilovolt pulse voltage and provides the pulse voltage to the capacitor C to be measured2. The step-up transformer is immersed in an insulating medium, so that the safe insulation of the kilovolt pulse voltage is ensured.
The test module comprises a tested capacitor C2The device comprises a test probe, a temperature control module and a discharge resistor. Capacitor C to be measured2Receiving the ten-kilovolt pulse voltage output by the boosting module and measuring the capacitor C2Two ends of the probe are connected with a test probe to measure the tested capacitor C2The value of the voltage on. Temperature control module and tested capacitor C2The test probe and the bleeder resistor are immersed in the insulating medium together to ensure that the temperature of the whole test module is controllable, thereby simulating the tested capacitor C2Different operating temperatures. And finally, the high-voltage pulse voltage is discharged through the discharge resistor, so that the safety of the whole capacitance detection device is ensured.
From the energy storage capacitor C1To the measured capacitor C2In the charging and discharging process, the energy storage capacitor C1And the measured capacitance C2The following relationships exist: as energy storage capacitor C1Capacity value C1>Capacitor C to be measured2Capacity value C2When has a ratio
Fig. 3 is a schematic diagram of two driving waveforms in the present invention, first, the two-stage power switch device formed by the first power switch device and the second power switch device is turned off, and the high voltage dc power supply provides the high voltage dc voltage. The first signal generating device drives the first power switch device at the driving time sequence of Drive1, and the first power switch device is turned on and becomes the energy storage capacitor C1Charging, capacitor C to be stored1And closing the first power switch device when the charging is completed. The second signal generating device drives the second power switch device with the Drive time sequence of Drive2 after the first power switch device is closed, the second power switch device is conducted, and the energy storage capacitor C1Starting discharge, measured capacitance C2Charging is started. Energy storage capacitor C1The voltage in the capacitor is boosted by the boosting module and then transmitted to the capacitor C to be measured2. Capacitor C to be measured2After charging, the second power switch device is closed, and the measured capacitor C2And starting the next period after the discharge is finished.
FIG. 4 is a schematic structural diagram of a test module according to the present invention. The whole test module comprises a tested capacitor C2The testing probe, the temperature control module and the bleeder resistor. All test modules are immersed in an insulating medium. The high-voltage pulse voltage output by the boosting module is added to the capacitor C to be tested through the connecting terminal 1 and the connecting terminal 2 of the testing module2The capacitor is charged. The test probe is connected with the test point 1 and the test point 2 to measure the tested capacitor C in real time2The voltage value across the terminals. Capacitor C to be measured2The output end is connected with the bleeder resistor through the connecting terminal 3 and the connecting terminal 4. The test module is filled with liquid insulating medium, all parts are immersed in the insulating medium, and the working temperature of the whole test module is controlled by the temperature control module.
The invention provides a capacitance detection method and a capacitance detection device under high pulse voltage and different working temperatures, which are provided by a high-voltage direct-current power supplyFor supplying kilovolt DC voltage, the first signal generator controls the first power switch device to be the energy-storage capacitor C1Charging and energy-storing capacitor C1When the energy storage capacitor C is full of energy, the first power switch device is turned off, the second power switch device is turned on, and the energy storage capacitor C is boosted by the boosting module1The middle voltage is increased to a pulse voltage in ten thousand volt microsecond level to a tested capacitor C2And (6) charging. According to the energy storage capacitor C1Measured capacitance C2In the charging process, when the energy storage capacitor C1>Capacitor C to be measured2When has a ratio
Wherein VC2maxFinger-to-be-tested capacitor C2Maximum voltage, VC, charged1The voltage value of the energy storage capacitor is indicated, and the voltage value passes through the energy storage capacitor C1And the measured capacitance C2The ratio of the voltages can be calculated to obtain the measured capacitance C2The capacity value of (c). Controlling the measured capacitance C2The tested capacitor C is tested by the test probe2The variation of the high pulse voltage can calculate the measured capacitance C2Is temperature dependent. And finally, the high pulse voltage is discharged through the discharge resistor to ensure the safety of the whole capacitance detection device.
Compared with the prior art, the invention has the beneficial effects that:
the high-voltage DC power supply is used for providing kilovolt DC voltage, and the first signal generating device is used for controlling the first power switch device to be the energy storage capacitor C1Charging, and boosting the voltage of the boosting module to charge the energy storage capacitor C1The middle voltage is increased to a pulse voltage in ten thousand volt microsecond level to a tested capacitor C2Charging and controlling the measured capacitance C2The tested capacitor C is tested by the test probe2The capacitance test requirement under the conditions of high pulse voltage and different working temperatures can be met due to the change of the charge-discharge characteristics of the capacitor along with the temperature under the high pulse voltage.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described system embodiments are merely illustrative, and for example, a division of a unit may be a logical division, and an actual implementation may have another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A capacitance detection method under high pulse voltage and different working temperatures is characterized by comprising the following steps:
charging the energy storage capacitor through the direct current high voltage of the high-voltage direct current power supply;
chopping the direct-current high voltage output by the energy storage capacitor into pulse voltage;
raising the pulse voltage to a high pulse voltage and transmitting the high pulse voltage to the capacitor to be tested;
and changing the working temperature of the measured capacitor to obtain the capacitance characteristics of the measured capacitor under high pulse voltage and different working temperatures.
2. The method for capacitance detection at high pulse voltages and different operating temperatures according to claim 1, comprising the following steps:
charging the energy storage capacitor through the kilovolt direct current high voltage of the high voltage direct current power supply;
chopping the kilovolt direct current high voltage output by the energy storage capacitor into kilovolt pulse voltage;
raising the kilovolt pulse voltage to kilovolt pulse voltage and transmitting the kilovolt pulse voltage to a capacitor to be measured;
and changing the working temperature of the measured capacitor to obtain the capacitance characteristics of the measured capacitor under the pulse voltage of ten thousand volts and different working temperatures.
3. The method according to claim 1, wherein the capacitance characteristics include the change of the charge-discharge characteristics of the measured capacitor with temperature under the high pulse voltage.
4. A capacitance detection device at high pulse voltages and different operating temperatures, comprising:
the high-voltage charging module is used for charging the energy storage capacitor through the direct-current high voltage of the high-voltage direct-current power supply;
the pulse voltage generating module is used for chopping the direct-current high voltage output by the energy storage capacitor into pulse voltage;
the boosting module is used for boosting the pulse voltage to a high pulse voltage and transmitting the high pulse voltage to the capacitor to be tested;
and the test module is used for changing the working temperature of the tested capacitor to obtain the capacitance characteristics of the tested capacitor under high pulse voltage and different working temperatures.
5. The capacitance detection device according to claim 4, wherein the high voltage charging module comprises: high-voltage DC power supply and energy storage capacitor C1The first power switch device is connected with the first signal generating device; when the first signal generating device drives the first power switch device to be conducted according to a first driving time sequence, the high-voltage direct-current power supply provides kilovolt direct-current voltage to the energy storage capacitor C1And (6) charging.
6. The capacitance detection device according to claim 4, wherein the pulse voltage generation module comprises: the second signal generating device and the second power switch device; when the second signal generating device drives the second power switch device to be conducted according to a second driving time sequence, the direct-current high voltage generated by the high-voltage charging module is chopped into pulse voltage and the pulse voltage is transmitted to the boosting module.
7. The method as claimed in claim 4High pulse voltage, capacitance detection device under the different operating temperature, its characterized in that, the module that steps up includes: a step-up transformer, an insulating medium; the boosting transformer boosts the pulse voltage to a kilovolt pulse voltage and provides the pulse voltage to a tested capacitor C in the test module2And the boosting transformer is immersed in the insulating medium in the boosting module.
8. The capacitance detection device according to claim 4, wherein the test module comprises: the measured capacitance C2The testing device comprises a testing probe, a temperature control module, a discharge resistor and an insulating medium; the measured capacitance C2Receiving the kilovolt pulse voltage output by the boosting module and discharging through the discharging resistor, and the tested capacitor C2The two ends of the temperature control module are connected with the test probe, and the temperature control module is used for setting different working temperatures and then measuring the measured capacitor C2The value of the voltage on; the temperature control module and the measured capacitor C2The test probe and the discharge resistor are immersed in an insulating medium in the test module.
9. The apparatus of claim 8, wherein said energy storage capacitor C is used when said capacitor C is used for detecting capacitance under high pulse voltage and different working temperatures1Capacity value C1>Capacitor C to be measured2Capacity value C2When there is a voltage ratio
Wherein VC2maxFinger-to-be-tested capacitor C2Maximum voltage, VC, charged1The voltage value of the energy storage capacitor is indicated; the energy storage capacitor C is known1Through said energy storage capacitor C1And the measured capacitance C2The ratio of the voltages between the two capacitors is calculated to obtain the measured capacitance C2The capacity value of (c).
10. Capacitance sensing at high pulse voltages, different operating temperatures according to claim 8The device is characterized in that the high-voltage pulse voltage output by the boosting module is added to the tested capacitor C through two connecting terminals of the testing module2Upper charging, the test probe and the tested capacitor C2Two test points at two ends are connected, and the measured capacitor C is measured in real time2Voltage values at both ends; the measured capacitance C2The output end is connected with the bleeder resistor through two connecting terminals.
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