CN118112323B - Circuit structure for measuring alternating current impedance and use method - Google Patents
Circuit structure for measuring alternating current impedance and use method Download PDFInfo
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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Abstract
The invention provides a circuit structure for measuring alternating current impedance, which consists of a low-frequency ripple generating circuit, a high-frequency ripple generating circuit, a direct current voltage supporting circuit and a measured object. The low-frequency ripple wave generating circuit and the high-frequency ripple wave generating circuit act together to generate a signal with the frequency range of 0 Hz-100 kHz, and the signal is transmitted to a measured object to realize broadband impedance measurement; the direct-current voltage support circuit is used for generating direct-current voltage bias and balancing direct-current components of the voltage of the tested object during normal operation. The invention can reduce the voltage and current stress of the high-frequency ripple generating circuit power device by introducing the direct-current voltage supporting circuit, and can adapt the alternating-current impedance measuring system to the working characteristics of the measured object, and realize the on-line measurement of the alternating-current impedance of the measured object.
Description
Technical Field
The invention belongs to the field of alternating current impedance test power supplies, and particularly relates to a circuit structure for alternating current impedance measurement and a use method thereof.
Background
Green hydrogen energy is a great strategic direction for coping with climate change worldwide and realizing low-carbon transformation of energy. The high-power Proton Exchange Membrane (PEM) electrolytic hydrogen production technology has the characteristics of high electrolytic efficiency, quick dynamic response, wide load regulation range and the like, and is an important way for realizing renewable energy hydrogen production. In recent 10 years, the global acceleration of PEM electrolytic hydrogen production technology research and development has been carried out, and the units such as Cummins, norway NEL, germany SIEMENS, chinese academy of sciences, institute of chemistry and physics, chinese heavy industry group company, seventh eighth institute, etc. all have the capability of building a high-power system based on a plurality of electrolytic stack monomers. However, under the complex working conditions of frequent start-stop, overload, rapid and large-amplitude load change and the like, the high-power PEM electrolytic stack single body severely changes the local electrode potential, temperature, flow, pressure and the like of the electrolytic single cell and the electrolytic stack, so that the performance attenuation of key materials and core components is aggravated, and great challenges are provided for dynamic parameter adjustment of the system. Therefore, multi-working-condition, multi-dimensional and multi-level comprehensive tests are carried out aiming at a high-power PEM electrolysis single cell-electrolysis stack-system. However, the problems of missing test equipment, imperfect diagnosis and evaluation technology, blank application scene performance evaluation method and the like are faced at present, and research of PEM electrolytic hydrogen production test equipment technology, diagnosis and evaluation technology, hydrogen safety protection technology and comprehensive test and evaluation system adapting to multiple working conditions and high power is urgently needed to be developed, support development of PEM electrolytic hydrogen production industry and accelerate clean low-carbon transformation of propulsion energy.
CN116581959a patent document discloses an ac/dc parallel power supply circuit and a control method, and relates to the technical field of power electronics, wherein the main circuit comprises a three-phase voltage source, two isolation transformers, two diode rectifying circuits, a tripled staggered parallel Boost conversion circuit, a single-phase inverter circuit and an electrolytic tank load circuit; in the control circuit, the current-voltage double-loop control PI regulating circuit controls the direct-current output voltage to follow a preset voltage value based on a preset current inner loop control strategy and a preset voltage outer loop control strategy; the control circuit compensation circuit sequentially performs difference processing, moving average filtering processing and PI control processing on the inverter output current and a preset current value to obtain an intermediate current; the load ripple PWM control circuit controls the load ripple current to follow the preset ripple instruction current based on a preset load ripple control strategy and combined with the intermediate current. The invention is intended to be applied to the occasion of high-power high-current hydrogen production power supply, and simultaneously outputs accurate alternating current ripple and direct current within the wide frequency range of 0.1Hz-10 kHz. The disadvantages of this are: firstly, the rectifying side adopts diode uncontrolled rectification, the direct current bus capacitor voltage is uncontrollable, and the harmonic performance of the direct current side is poor. Second, the case where a high-frequency ripple current is injected into the Boost circuit front stage is not considered. Third, the output side of the single-phase full-bridge inverter circuit has larger direct-current voltage bias, so that the control precision of the output alternating-current ripple current is poor, and the voltage and current stress of the switching tube of the full-bridge inverter are larger. Fourth, the single-phase full-bridge inverter circuit adopts the IGBT device, is not suitable for the high frequency occasion, therefore the switching frequency of full-bridge inverter circuit is lower, and the ripple current frequency range of output is limited, can't realize wide frequency domain scope ripple current output.
In general, the online AC impedance spectrum test capability of the existing high-power PEM electrolytic stack is relatively poor, and the problems that the realization of high-power broadband AC output is difficult, the broadband AC signal is greatly influenced by the current source shunt, the AC impedance spectrum sweep frequency detection method is time-consuming and the like exist, so that the requirements of high-precision impedance detection and performance evaluation of the high-power PEM electrolytic stack cannot be met.
Disclosure of Invention
The invention aims to overcome the defects and provide a circuit structure for measuring alternating current impedance, which can solve or at least partially solve the technical problems that the realization of high-power broadband alternating current output is difficult, broadband alternating current signals are greatly influenced by direct current source shunt, the alternating current impedance spectrum sweep frequency detection method is long in time consumption, and the requirements of high-precision impedance detection and performance evaluation of a high-power PEM (PEM) electrolytic stack cannot be met.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the circuit structure for measuring alternating current impedance is characterized by comprising a low-frequency ripple generating circuit, a high-frequency ripple generating circuit, a direct current voltage supporting circuit and an object to be measured, wherein:
the output positive and negative poles of the low-frequency ripple generating circuit are connected with the positive and negative poles of the tested object;
the output cathode of the high-frequency ripple generating circuit is connected with the output anode of the direct-current voltage supporting circuit, the high-frequency ripple generating circuit and the direct-current voltage supporting circuit form a serial structure, and the output anode of the high-frequency ripple generating circuit is connected with the anode of the tested object;
the output cathode of the direct-current voltage supporting circuit is connected with the cathode of the tested object, and the high-frequency ripple generating circuit and the direct-current voltage supporting circuit form a parallel structure together with the low-frequency ripple generating circuit;
The low-frequency ripple generating circuit is used for generating signals with the frequency range of 0 Hz-1000 Hz and transmitting the signals to the measured object;
The high-frequency ripple generating circuit is used for generating signals with the frequency range of 100 Hz-100 kHz, and is combined with the low-frequency ripple generating circuit to generate signals with the frequency range of 0 Hz-100 kHz, and the signals are transmitted to a tested object;
The direct-current voltage support circuit is used for generating direct-current voltage bias and balancing direct-current components of the voltage of the tested object during normal operation.
Further, the low-frequency ripple generating circuit includes: the module is formed by sequentially connecting an alternating current power supply, an alternating current/direct current converter and a direct current/direct current converter in series, or connecting the direct current power supply and the direct current/direct current converter in series.
Further, the high-frequency ripple generating circuit includes: the module is formed by sequentially connecting an alternating current power supply, an alternating current/direct current converter and a direct current/direct current converter in series, or connecting the direct current power supply and the direct current/direct current converter in series.
Further, the direct-current voltage supporting circuit includes: the support device consists of a super capacitor, a common capacitor, a battery and a direct-current voltage source.
Further, the low-frequency ripple generating circuit is formed by connecting n modules in parallel, and the number n of the low-frequency ripple generating circuit is determined by the working power of the power supply and the voltage and current level.
Further, the high-frequency ripple generating circuit is formed by connecting m modules in parallel, and the number m is determined by the amplitude of the signal.
Further, the object to be measured includes an electrolytic cell.
Another object of the present invention is to provide a method for using a circuit structure for ac impedance measurement, which is characterized by specifically comprising the following steps:
(1) When the alternating current impedance measuring circuit begins to work, only the low-frequency ripple generating circuit works, the low-frequency ripple generating circuit provides direct current for a measured object, and after the steady state is reached, the supporting device in the direct current voltage supporting circuit is charged; up to the voltage sum across the DC voltage support device the direct current components of the voltages at two ends of the measured object are equal;
(2) When the voltage at two ends of the direct-current voltage supporting device is equal to the direct-current component of the voltage at two ends of the tested object, the low-frequency ripple generating circuit and the high-frequency ripple generating circuit cooperate together to generate signals with specific amplitude and frequency and transmit the signals to the tested object.
Further, charging the support device in the direct current voltage support circuit includes: the method is performed by generating an adjustable direct current voltage through connecting an alternating current/direct current converter with a power grid.
Further, charging the support device in the direct current voltage support circuit includes: by connecting the resistors in series through the electrolytic cells.
Compared with the prior art, the invention has the following advantages:
First, the circuit structure of the invention does not affect the normal work of the measured object, and can realize the on-line measurement of the alternating current impedance in a wide frequency domain.
Secondly, the direct-current voltage supporting circuit provided by the invention can avoid that the high-frequency ripple generating circuit limits the accurate control of current in a wide voltage range due to the provision of high-voltage output, and can greatly reduce the voltage and current stress of a power device of the high-frequency ripple generating circuit.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration for AC impedance measurement according to the present invention;
FIG. 2 is a schematic diagram of a specific embodiment of the circuit configuration for AC impedance measurement shown in FIG. 1;
FIG. 3 is a schematic diagram of a single module structure of the low frequency ripple generating circuit of the present invention;
FIG. 4 is a schematic diagram of a single module structure of the high frequency ripple generating circuit of the present invention;
FIG. 5 is a schematic diagram of a DC voltage supporting circuit according to the present invention;
fig. 6 is a schematic diagram of the structure of an IGBT switching tube according to the present invention;
fig. 7 is a schematic diagram of a MOSFET switch tube according to the present invention.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect. The description hereinafter sets forth a preferred embodiment for practicing the invention, but is not intended to limit the scope of the invention, as the description is given for the purpose of illustrating the general principles of the invention. The scope of the invention is defined by the appended claims.
Referring to fig. 1 and 2, taking an electrolytic cell load as an example, a circuit structure for measuring ac impedance of the present invention includes: the device comprises a low-frequency ripple generating circuit, a high-frequency ripple generating circuit, a direct-current voltage supporting circuit and an object to be tested, wherein the low-frequency ripple generating circuit is formed by cascading a three-phase PWM rectifier, a three-phase staggered parallel Buck converter and an auxiliary inductor to form a plurality of modules; the high-frequency ripple generating circuit is composed of a three-phase PWM rectifier and a plurality of single-phase full-bridge inverters; the direct-current voltage supporting circuit is composed of a rectifier, a charging resistor, a super capacitor and a contactor switch, the positive electrode of the direct-current voltage supporting circuit is connected with the negative electrode of the output side of the high-frequency ripple generating circuit, only the low-frequency ripple generating circuit works, the low-frequency ripple generating circuit supplies direct current to the electrolytic tank, after the direct-current voltage supporting circuit reaches a steady state, the direct-current voltage supporting circuit is charged until the voltages at two ends of the super capacitor are equal to the direct-current source voltage in the electrolytic tank, when the voltage of the super capacitor is equal to the direct-current source voltage in the electrolytic tank, the high-frequency ripple generating circuit starts to work at the moment, the modulation ratio of the full-bridge inverter is kept unchanged, and the full-bridge inverter outputs high-frequency ripple current with specific amplitude. The circuit structure for measuring the alternating current impedance of the megawatt-level electrolytic tank distinguishes and combines the high-frequency ripple generating circuit and the low-frequency ripple generating circuit, can realize wide-frequency measurement of the electrolytic tank, provides a super capacitor supporting voltage loop, avoids the high-frequency ripple loop from limiting the high voltage of the output side to realize accurate control of current in a wide voltage range, and can greatly reduce the voltage and current stress of the full-bridge inverter switching tube.
As a specific embodiment, the low-frequency ripple generating circuit adopts a multi-module parallel technology, n modules formed by cascading a three-phase PWM rectifier, a three-phase staggered parallel Buck converter and an auxiliary inductor L o are connected in parallel, and the harmonic offset characteristic of the multi-winding phase-shifting transformer is utilized to realize high-capacity low-harmonic output. The parallel number n is determined by the working power of the power supply and the voltage and current grade; the flexible expansion and reconstruction of the output voltage power supply are realized by combining a switch matrix technology, and the flexible test requirements of the electrolytic stack with various voltage and current grades are met; aiming at the high-precision test power supply regulation and control requirement, the power supply adopts a staggered parallel structure and combines a layered operation strategy to realize virtual rated capacity output under any power requirement and ensure wide-range high-precision regulation.
The invention distinguishes and combines the high-frequency ripple generating circuit and the low-frequency ripple generating circuit, and can realize the broadband measurement of the electrolytic tank.
Referring to fig. 3, as a specific embodiment, the three-phase PWM rectifier in the low-frequency ripple generating circuit is composed of a three-phase first filter inductor L A, a three-phase second filter inductor L B, a three-phase third filter inductor L C, a three-phase rectifier bridge composed of switching transistors S 1、S2、S3、S4、S5、S6, and a dc-side filter capacitor C in1, One side of the three-phase filter inductor is the three-phase voltage of the power grid, the other side is connected with the midpoint of the three-phase rectifier bridge, and the output of the rectifier bridge is connected with the direct-current side filter capacitor C in1 and is used as the input of the lower-stage three-phase staggered parallel Buck converter. The three-phase staggered parallel Buck converter consists of a switching tube S 7、S8、S9、S10、S11、S12, a filter inductor L 1, a filter inductor L 2, a filter inductor L 3 and an output side filter capacitor C o1, The midpoint of the bridge arm of the half bridge formed by the switch tube S 7 and the switch tube S 8 is connected with one end of the filter inductance L 1, the midpoint of the bridge arm of the half bridge formed by the switch tube S 9 and the switch tube S 10 is connected with one end of the filter inductance L 2, The midpoint of the bridge arm of the half bridge formed by the switch tube S 11 and the switch tube S 12 is connected with one end of a filter inductor L 3, one end of a filter capacitor C o1 is connected with the other end of the filter inductor L 1、L2、L3, the other end of the filter capacitor C o1 is connected with the emitter of the switching tube S 8、S10、S12, the input of the three-phase staggered parallel Buck converter of the current stage is the output of the three-phase PWM rectifier of the previous stage, and the output of the filter capacitor C o1 is connected with the electrolytic tank. The auxiliary inductor L o serves to increase the high-frequency impedance of the low-frequency loop, thereby reducing its shunt to the high-frequency ripple.
Referring to fig. 4, as a specific embodiment, the high-frequency ripple generating circuit is composed of a transformer and m single-phase full-bridge inverters, wherein the single-phase full-bridge inverters are composed of a capacitor C in2, a switching tube Q 1, a switching tube Q 2, a switching tube Q 3, the switching tube Q 4, the inductance L 4 and the capacitance C o2, the switching tube Q 1、Q2、Q3、Q4 forms a full bridge structure, One end of the capacitor C in2 is connected with collectors of the switching tubes Q 1 and Q 3, and the other end is connected with emitters of the switching tubes Q 2 and Q 4. The switching tube Q 1、Q2 forms one bridge arm of the full-bridge structure, the switching tube Q 3、Q4 forms the other bridge arm of the full-bridge structure, the middle points of the two bridge arms are connected with the inductor L 4 and the capacitor C o2, One end of a capacitor C o2 connected with the inductor L 4 is connected with the anode of the electrolytic cell, and the other end of the capacitor C o2 is connected with the anode of the super capacitor.
Referring to fig. 5, as a specific embodiment, the dc voltage supporting circuit is composed of a rectifier, a charging resistor R, a super capacitor C o3 and a contactor switch T 1、T2. One end of the charging resistor R is connected with the anode of the electrolytic cell, the other end of the charging resistor R is connected with the contactor switch T 2, and the other end of the contactor switch T 2 is connected with the anode of the super capacitor. The positive electrode of the rectifier output is connected with a contactor switch T 1, and the other end of the contactor switch T 1 is connected with the positive electrode of the super capacitor. The anode of the super capacitor is connected with the anode of the electrolytic cell, and the cathode of the super capacitor is connected with the output cathode of the rectifier and the cathode of the electrolytic cell.
Referring to fig. 6, as a specific embodiment, the driven device used for the three-phase PWM rectifier and the three-phase interleaved parallel Buck converter is an IGBT device.
Referring to fig. 7, as a specific embodiment, the driven device used in the single-phase full-bridge inverter in the high-frequency ripple generating circuit is a MOSFET device.
As a specific example, two methods can be used to charge the supercapacitor: one method is to generate an adjustable direct current voltage through a rectifier, and the other method is to charge a super capacitor through an electrolytic cell series resistor. When the super capacitor is fully charged, it can be turned off by contactor switch T 1 or T 2.
As a specific embodiment, the control steps of the dc voltage supporting circuit are as follows:
Step 1, when the low-frequency ripple generating circuit works, the low-frequency ripple generating circuit supplies direct current to the electrolytic tank, after the low-frequency ripple generating circuit reaches a steady state, a switch T 2 is closed, a direct-current voltage source in the electrolytic tank charges a super capacitor C o3 through a resistor R until the voltages at two ends of the super capacitor are equal to the direct-current source voltage in the electrolytic tank; another method is to close the switch T 1 to charge the super capacitor C o3 after the rectifier of the dc voltage supporting circuit is started, until the voltages at the two ends of the super capacitor are equal to the dc source voltage in the electrolytic cell.
And 2, when the voltage at two ends of the super capacitor is equal to the direct current source voltage in the electrolytic tank, the high-frequency ripple generating circuit starts to work, the modulation ratio of the full-bridge inverter is kept unchanged, and the full-bridge inverter is controlled to output high-frequency ripple current with specific amplitude by changing the voltage at two ends of the capacitor C in2.
The direct-current voltage supporting circuit prevents the high-frequency ripple circuit from limiting the high-voltage on the output side to realize accurate control of current in a wide voltage range, and simultaneously can greatly reduce the voltage and current stress of the switching tube of the full-bridge inverter.
In summary, the beneficial effects of the invention are as follows: the circuit structure of the device is composed of a transformer, a low-frequency ripple wave generating circuit, a high-frequency ripple wave generating circuit, a direct-current voltage supporting circuit and a measured object. The low-frequency ripple generating circuit is formed by connecting a plurality of modules in parallel, the number of the low-frequency ripple generating circuit depends on the working power of a power supply and the voltage and current level, and a single module is formed by cascading a three-phase PWM rectifier, a three-phase staggered parallel Buck converter and an auxiliary inductor; the high-frequency ripple generating circuit consists of a three-phase PWM rectifier and a plurality of single-phase full-bridge inverter modules; the direct-current voltage supporting circuit is composed of a rectifier, a charging resistor, a super capacitor and a contactor switch, and the positive electrode of the super capacitor is connected with the negative electrode of the output side of the single-phase full-bridge inverter. The circuit distinguishes and combines the high-frequency ripple generating circuit and the low-frequency ripple generating circuit, so that the broadband measurement of the electrolytic tank can be realized; by introducing the direct-current voltage supporting circuit, the high-frequency ripple circuit is prevented from being limited in a wide voltage range due to the fact that the high voltage of the output side is provided, the accurate control of the current is realized, meanwhile, the voltage and the current stress of the switching tube of the full-bridge inverter can be greatly reduced, and the whole system can be enabled to realize the accurate control of the current in the wide voltage range.
While the foregoing description illustrates and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (10)
1. The circuit structure for measuring alternating current impedance is characterized by comprising a low-frequency ripple generating circuit, a high-frequency ripple generating circuit, a direct current voltage supporting circuit and an object to be measured, wherein:
the output positive and negative poles of the low-frequency ripple generating circuit are connected with the positive and negative poles of the tested object;
the output cathode of the high-frequency ripple generating circuit is connected with the output anode of the direct-current voltage supporting circuit, the high-frequency ripple generating circuit and the direct-current voltage supporting circuit form a serial structure, and the output anode of the high-frequency ripple generating circuit is connected with the anode of the tested object;
the output cathode of the direct-current voltage supporting circuit is connected with the cathode of the tested object, and the high-frequency ripple generating circuit and the direct-current voltage supporting circuit form a parallel structure together with the low-frequency ripple generating circuit;
The low-frequency ripple generating circuit is used for generating signals with the frequency range of 0 Hz-1000 Hz and transmitting the signals to the measured object;
The high-frequency ripple generating circuit is used for generating signals with the frequency range of 100 Hz-100 kHz, and is combined with the low-frequency ripple generating circuit to generate signals with the frequency range of 0 Hz-100 kHz, and the signals are transmitted to a tested object;
The direct-current voltage support circuit is used for generating direct-current voltage bias and balancing direct-current components of the voltage of the tested object during normal operation.
2. The circuit structure for ac impedance measurement according to claim 1, wherein the low-frequency ripple generating circuit comprises: the module is formed by sequentially connecting an alternating current power supply, an alternating current/direct current converter and a direct current/direct current converter in series, or connecting the direct current power supply and the direct current/direct current converter in series.
3. The circuit structure for ac impedance measurement according to claim 1, wherein the high-frequency ripple generating circuit comprises: the module is formed by sequentially connecting an alternating current power supply, an alternating current/direct current converter and a direct current/direct current converter in series, or connecting the direct current power supply and the direct current/direct current converter in series.
4. The circuit configuration for ac impedance measurement according to claim 1, wherein the dc voltage supporting circuit comprises: the support device consists of a super capacitor, a common capacitor, a battery and a direct-current voltage source.
5. The circuit structure for ac impedance measurement according to claim 2, wherein the low frequency ripple generating circuit is formed by connecting n modules in parallel, the number n of which is determined by the power of the power supply and the voltage-current level.
6. A circuit arrangement for ac impedance measurement according to claim 3, characterized in that the high frequency ripple generating circuit is constituted by m modules connected in parallel, the number m of which is determined by the magnitude of the signal.
7. The circuit configuration for ac impedance measurement according to claim 1, wherein the object to be measured comprises an electrolytic cell.
8. A method of using a circuit configuration for ac impedance measurement according to claim 1, comprising the steps of:
(1) When the alternating current impedance measuring circuit begins to work, only the low-frequency ripple generating circuit works, the low-frequency ripple generating circuit provides direct current for a measured object, and after the steady state is reached, the supporting device in the direct current voltage supporting circuit is charged; up to the voltage sum across the DC voltage support device the direct current components of the voltages at two ends of the measured object are equal;
(2) When the voltage at two ends of the direct-current voltage supporting device is equal to the direct-current component of the voltage at two ends of the tested object, the low-frequency ripple generating circuit and the high-frequency ripple generating circuit cooperate together to generate signals with specific amplitude and frequency and transmit the signals to the tested object.
9. The method of claim 8, wherein charging the support device in the dc voltage support circuit comprises: the method is performed by generating an adjustable direct current voltage through connecting an alternating current/direct current converter with a power grid.
10. The method of claim 8, wherein charging the support device in the dc voltage support circuit comprises: by connecting the resistors in series through the electrolytic cells.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075431A (en) * | 2021-03-19 | 2021-07-06 | 常州同惠电子股份有限公司 | Signal source generating circuit and signal source generating method for alternating current impedance test |
| CN115664297A (en) * | 2022-10-25 | 2023-01-31 | 南京航空航天大学 | Electric car charging circuit without winding change-over switch and electrolytic capacitor and method |
Family Cites Families (3)
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| CN205754002U (en) * | 2016-06-20 | 2016-11-30 | 华北科技学院 | A kind of power supply control system |
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| CN113075431A (en) * | 2021-03-19 | 2021-07-06 | 常州同惠电子股份有限公司 | Signal source generating circuit and signal source generating method for alternating current impedance test |
| CN115664297A (en) * | 2022-10-25 | 2023-01-31 | 南京航空航天大学 | Electric car charging circuit without winding change-over switch and electrolytic capacitor and method |
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| CN118112323A (en) | 2024-05-31 |
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