CN105425066A - Special capacitor ripple current detection main circuit for flexible direct-current power transmission - Google Patents
Special capacitor ripple current detection main circuit for flexible direct-current power transmission Download PDFInfo
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Abstract
The invention discloses a special capacitor ripple current detection main circuit for flexible direct-current power transmission, comprising a power module, a protection module, a first rectifier bridge, a second rectifier bridge, an alternating-current generator, and a discharge module. The power module is divided into two channels after passing through the protection module; one channel is connected with the first rectifier bridge through a voltage regulator and a step-up transformer, and one output end a1 of the first rectifier bridge is used as one access end c1 of a capacitor to be detected; the other channel is connected with the second rectifier bridge through a step-down transformer, the second rectifier bridge is connected with the alternating-current generator, and the end, connected with the second rectifier bridge, of the alternating-current generator is connected with the other output end a2 of the first rectifier bridge; and the other end of the alternating-current generator is used as the other access end c2 of the capacitor to be detected, and the discharge module is connected between the access end c1 and the access end c2. Direct current output by the first rectifier bridge is applied to the capacitor to be detected C3. Ripple current generated by an electrical impedor L1 of the alternating-current generator is attached to the capacitor to be detected C3 in order to perform ripple current detection on the capacitor to be detected C3.
Description
Technical field
The invention belongs to capacitor performance technical field of measurement and test, be specifically related to a kind of flexible DC power transmission dedicated capacitor ripple current and detect main circuit.
Background technology
Flexible DC power transmission is the important equipment building intelligent grid, compared with traditional approach, flexible DC power transmission at the capacity-increasing transformation of island with power, urban power distribution network, have stronger technical advantage in AC system is interconnected, large-scale wind power field is grid-connected etc., is the strategic choice (see " Technology of HVDC based Voltage Source Converter fundamental research ") changing bulk power grid development pattern.And required capacitor also has the feature of its uniqueness in this project: high voltage, Large Copacity, big current.In order to weigh the overcurrent capability of capacitor, need to carry out testing experiment by corresponding testing apparatus to it, this technology is exactly a technology (see GB/T17702) of the conveyance capacity in order to evaluate capacitor.
Existing measuring technology mainly contains several as follows:
One, utilizes 50Hz sine wave AC to substitute ripple current.This method of testing has following several shortcoming: first, capacitor is in real operational process, the electric current passed through not is the AC sine wave of 50Hz, but frequency 500Hz ~ 6kHz, even individual other reaches intermediate frequency or the high frequency ripple of 20kHz, and the ripple current of these two kinds of different frequencies acts on the effect that capacitor causes above is different, frequency is higher under identical watt current, and the temperature rise that capacitor produces is higher.So although this method is identical in the display of watt current, with physical presence gap, the experimental data property of can refer to is not strong.The second, if apply alternating voltage, in experimentation, the actual watt current being applied to capacitor two ends is not high, often lower than the DC bus-bar voltage of this type of capacitor.For 1200Vdc-800 μ F product, requirement ripple current is 70A, if so apply to exchange, the effective value of alternating voltage only has 278.7Vac, this voltage, well below the load voltage value 1200Vdc of capacitor, so just cannot examine voltage on its impact in experimentation simultaneously.
Its two, utilize variable-frequency power sources to provide electric current.This method overcomes the different problem of said method frequency, and variable-frequency power sources can provide the ripple current of optional frequency, but above-mentioned second shortcoming still exists, and cannot take into account the dual examination of electric current and voltage simultaneously.In addition, variable-frequency power sources is the interchange input of 220V or 380V at input end, and output is high frequency ripple, and so in experimentation, because the current value of output terminal is comparatively large, cause the input current of input end excessive, the power input of variable-frequency power sources is restricted.The cost of high power frequency conversion power supply is too high again.So, this kind of capacitor that method is less for capacity, voltage is lower still can, but increase a little capacity a little and then can not meet.
Its three, be directly assemblied on transmission facility and test.This method overcomes all shortcomings of above-mentioned two kinds of methods, and has reacted the actual working state of capacitor truly.But its shortcoming is more: first, cost is higher, exactly it is not an experimental facilities, but physical device, test by physical device, these physical devices are all electric power facilities, and hundreds of thousands is up to a million easily, test even if single power distribution cabinet is taken out, cost also obtains hundreds of thousands; Secondly, scope of experiment is narrow, a kind of capacitor can only be tested, because different capacitors has different physical dimension, different mounting meanss, necessary given different fixed support on equipment, since but equipment is carried out, all frameworks can not be changed, and so the capacitor of other specification just cannot be put on this equipment and test, even if volume is identical, so because capacity and voltage difference also cannot provide different current values; Again, experimentation cost is high, and actual plant capacity and capacity are all by actual design, and so required many groups often, quantity is more, and often doing single test all needs the capacitor being equipped with many groups to carry out; Again, this kind of test method cannot test the margin of operation drawing capacitor, the experiment that equipment does can only test the mxm. in actual moving process, but not the mxm. that capacitor technology requires, and the mxm. of technical requirement is often greater than the mxm. in actual moving process, this is the safety coefficient that the designer of equipment reserves; Again, because be testing equipment, so in the process of experiment, have the phenomenon of inefficacy unavoidably, and once there is the phenomenon lost efficacy, other parts of this equipment can be caused damage, cause damage.
Summary of the invention
For the deficiency mentioned in above-mentioned prior art, the object of this invention is to provide one to can be used for carrying out ripple current detection to different size capacitor, detection covering scope is wide, and it is more accurate to detect, and a kind of flexible DC power transmission dedicated capacitor ripple current that cost is low detects main circuit.
For realizing above-mentioned technical purpose, the technical solution adopted in the present invention is as follows:
A kind of flexible DC power transmission dedicated capacitor ripple current detects main circuit, comprise power module, protection module, the first rectifier bridge, the second rectifier bridge, ac generator and discharge module, power module is divided into two-way after protection module, one tunnel is connected with the first rectifier bridge after stepup transformer through pressure regulator, and an output terminal a1 of the first rectifier bridge is as an incoming end c1 of capacitor to be detected; Another road is connected with the second rectifier bridge after reducing transformer, and the second rectifier bridge is connected with ac generator, and one end that ac generator is connected with the second rectifier bridge is connected with another output terminal a2 of the first rectifier bridge; The other end of ac generator is as another incoming end c2 of capacitor to be detected, and discharge module is connected between incoming end c1 and incoming end c2.The DC current that first rectifier bridge exports is applied on testing capacitor C3, and the ripple current of the electrical impedance L1 generation of ac generator is attached on testing capacitor C3 and carries out ripple current detection to testing capacitor C3.
Described power module comprises two-way power supply, is respectively 380V three-phase alternating-current supply and 220V single phase alternating current power supply.
Described protection module comprises hand switch K1, contactor J1 often leaves auxiliary contact, pre-charge resistance R1 and contactor J2 often opens auxiliary contact, one end of hand switch K1 is connected with 380V three-phase alternating-current supply and 220V single phase alternating current power supply respectively, the other end of hand switch K1 and contactor J1 often open auxiliary contact and pre-charge resistance R1 is sequentially connected in series, contactor J2 often opens auxiliary contact and pre-charge resistance R1 is connected in parallel, the other end of pre-charge resistance R1 is divided into two-way, one tunnel is connected with the first rectifier bridge after stepup transformer through pressure regulator, another road is connected with the second rectifier bridge through reducing transformer.
Described pressure regulator is 380V/380V automatic coupling voltage regulator, described stepup transformer is 380V/850V stepup transformer, the primary side of 380V/380V pressure regulator is connected with the other end of pre-charge resistance R1, the secondary side of 380V/380V pressure regulator is connected with the primary side of 380V/850V stepup transformer, the secondary side of 380V/850V stepup transformer is connected with the first rectifier bridge, and an output terminal a1 of the first rectifier bridge is as an incoming end c1 of capacitor C3 to be detected; Another output terminal a2 of the first rectifier bridge is connected with one end of ac generator.380V/380V automatic coupling voltage regulator, for adjusting the output voltage of the first rectifier bridge, makes the DC voltage of testing capacitor C3 reach demand voltage.
Between an output terminal a1 and another output terminal a2 of the first rectifier bridge of the first rectifier bridge, be connected with the second capacitor C2, the second capacitor C2 mono-aspect prevents peak voltage from damaging the second rectifier bridge, prevents DC bus from occurring voltage fluctuation on the other hand.
Described reducing transformer is 380V/75V reducing transformer, the primary side of 380V/75V reducing transformer is connected with the other end of pre-charge resistance R1, the secondary side of 380V/75V reducing transformer is connected with the second rectifier bridge, and one end b1 of the second rectifier bridge is connected with ac generator, the other end b2 ground connection of the second rectifier bridge; One end that ac generator is connected with the second rectifier bridge is connected with another output terminal a2 of the first rectifier bridge, and the other end of ac generator is as another incoming end c2 of capacitor C3 to be detected.
The first capacitor C1 is connected with between an output terminal b1 and another output terminal b2 of the first rectifier bridge of the second rectifier bridge, first capacitor C1 mono-aspect prevents peak voltage from damaging the first rectifier bridge, prevents because superpotential damages the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 on the other hand.
Described ac generator comprises the first insulated gate bipolar transistor Q1, the second insulated gate bipolar transistor Q2, the first diode D1, the second diode D2 and reactor L1, the collector C of the first insulated gate bipolar transistor Q1 is connected with the output terminal b1 of the second rectifier bridge, the emitter E of the first insulated gate bipolar transistor Q1 is connected with the negative pole of the first diode D1, the plus earth of the first diode D1; The negative pole of the second diode D2 is connected with the collector C of the first insulated gate bipolar transistor Q1, the positive pole of the second diode D2 is connected with the collector C of the second insulated gate bipolar transistor Q2, the emitter E ground connection of the second insulated gate bipolar transistor Q2 as another incoming end c2 of capacitor C3 to be detected, reactor L1 is connected between the emitter E 1 of the first insulated gate bipolar transistor Q1 and the collector C of the second insulated gate bipolar transistor Q2.
Described discharge module comprises K switch 2 and resistance R2, is connected between incoming end c1 and incoming end c2 after K switch 2 and resistance R2 are connected in series.After testing capacitor C3 has tested, discharged by resistance R2, when the voltage drop of testing capacitor C3 is low to moderate 100V, testing capacitor C3 and the second capacitor C2 parallel connection is discharged by resistance R2.
Power module of the present invention passes through pressure regulator, stepup transformer and the first rectifier bridge to testing capacitor busbar voltage, then on busbar voltage, superpose the ripple current of the different frequency that is produced by the reactor in ac generator again, the performance of testing capacitor is detected, makes test environment closer to the environment of the actual use of testing capacitor.Can be supplied to more accurately and use producer's empirical value, so that the designer of equipment carries out equipment de-sign more accurately.Direct current capacitors real in circuit time, what it bore is that busbar voltage adds ripple voltage, and ripple current derives from ripple voltage.And the present invention simulates this duty exactly, use the DC voltage that the first rectifier bridge provides constant, by controlling the break-make of the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2, reactor produces ripple current and voltage.The present invention can carry out the setting of frequency according to the different demands of producer, can be adapted to the capacitor of all size, and can carry out multiple electric circumstance for a kind of specification and multiple physical environment carries out Experimental Comparison.Covering scope of the present invention is wide, and the mxm. of busbar voltage can reach 5000VDC, and the maximal value of ripple current can reach 900A, substantially can contain the DC application class capacitor of more than 80%, comprise DC support, soft directly etc.Occasionally can realize the ripple current experiment of different size capacitor, the more overcurrent capability of accurate evaluation capacitor, is supplied to the support of user's experimental data more accurately.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with Fig. 1-2, embodiment is specifically described.
Embodiment 1: as shown in Figure 1-2, a kind of flexible DC power transmission dedicated capacitor ripple current detects main circuit, comprises power module 1, protection module 2, first rectifier bridge 5, second rectifier bridge 8, ac generator 6 and discharge module 7.
Described power module 1 comprises two-way power supply, is respectively 380V three-phase alternating-current supply and 220V single phase alternating current power supply.
Described protection module 2 comprises hand switch K1, contactor J1 often leaves auxiliary contact, pre-charge resistance R1 and contactor J2 often opens auxiliary contact, one end of hand switch K1 is connected with 380V three-phase alternating-current supply and 220V single phase alternating current power supply respectively, the other end of hand switch K1 and contactor J1 often open auxiliary contact and pre-charge resistance R1 is sequentially connected in series, contactor J2 often opens auxiliary contact and pre-charge resistance R1 is connected in parallel, the other end of pre-charge resistance R1 is divided into two-way, one tunnel is connected with the first rectifier bridge 5 after stepup transformer 4 through pressure regulator 3, another road is connected with the second rectifier bridge 8 through reducing transformer 9.
Described pressure regulator 3 is 380V/380V automatic coupling voltage regulator, and described stepup transformer 4 is 380V/850V stepup transformer.The primary side of 380V/380V pressure regulator is connected with the other end of pre-charge resistance R1, the secondary side of 380V/380V pressure regulator is connected with the primary side of 380V/850V stepup transformer, the secondary side of 380V/850V stepup transformer is connected with the first rectifier bridge 5, and an output terminal a1 of the first rectifier bridge 5 is as an incoming end c1 of capacitor C3 to be detected; Another output terminal a2 of the first rectifier bridge 5 is connected with one end of ac generator 6.Between an output terminal a1 and another output terminal a2 of the first rectifier bridge 5 of the first rectifier bridge 5, be connected with the second capacitor C2, the second capacitor C2 mono-aspect prevents peak voltage from damaging the second rectifier bridge, prevents DC bus from occurring voltage fluctuation on the other hand.380V/380V automatic coupling voltage regulator, for adjusting the output voltage of the first rectifier bridge, makes the DC voltage of testing capacitor C3 reach demand voltage.
Described reducing transformer 9 is 380V/75V reducing transformer, the primary side of 380V/75V reducing transformer is connected with the other end of pre-charge resistance R1, the secondary side of 380V/75V reducing transformer is connected with the second rectifier bridge 8, one end b1 of the second rectifier bridge 8 is connected with ac generator, the other end b2 ground connection of the second rectifier bridge 8; One end that ac generator 6 is connected with the second rectifier bridge 8 is connected with another output terminal a2 of the first rectifier bridge 5, and the other end of ac generator 6 is as another incoming end c2 of capacitor C3 to be detected.The first capacitor C1 is connected with between an output terminal b1 and another output terminal b2 of the second rectifier bridge 8 of the second rectifier bridge 8, first capacitor C1 mono-aspect prevents peak voltage from damaging the first rectifier bridge, prevents because superpotential damages the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 on the other hand.
Described ac generator 6 comprises the first insulated gate bipolar transistor Q1, the second insulated gate bipolar transistor Q2, the first diode D1, the second diode D2 and reactor L1, the collector C of the first insulated gate bipolar transistor Q1 is connected with the output terminal b1 of the second rectifier bridge, the emitter E of the first insulated gate bipolar transistor Q1 is connected with the negative pole of the first diode D1, the plus earth of the first diode D1; The negative pole of the second diode D2 is connected with the collector C of the first insulated gate bipolar transistor Q1, the positive pole of the second diode D2 is connected with the collector C of the second insulated gate bipolar transistor Q2, the emitter E ground connection of the second insulated gate bipolar transistor Q2 as another incoming end c2 of capacitor C3 to be detected, reactor L1 is connected between the emitter E 1 of the first insulated gate bipolar transistor Q1 and the collector C of the second insulated gate bipolar transistor Q2.
Described discharge module 7 comprises K switch 2 and resistance R2, is connected between incoming end c1 and incoming end c2 after K switch 2 and resistance R2 are connected in series.After testing capacitor C3 has tested, discharged by resistance R2, when the voltage drop of testing capacitor C3 is low to moderate 100V, testing capacitor C3 and the second capacitor C2 parallel connection is discharged by resistance R2.
The course of work: testing capacitor C3 is accessed in main circuit by incoming end c1 and incoming end c2, closed hand switch K1, 380V three-phase alternating-current supply or the access of 220V single phase alternating current power supply, contactor J1 normally opened contact closes, pre-charge resistance R1 is divided into two-way after being energized, one tunnel is connected with the first rectifier bridge with 380V/850V stepup transformer through 380V/380V automatic coupling voltage regulator, the DC voltage of rectification adds on testing capacitor C3 by the first rectifier bridge, another road is connected with the second rectifier bridge through 380V/75V reducing transformer, the DC voltage of rectification is powered to ac generator by the second rectifier bridge.By the break-make of the first insulated gate bipolar transistor Q1 in control ac generator and the second insulated gate bipolar transistor Q2, reactor L1 is made to produce ripple voltage electric current and be attached on testing capacitor C3.
When the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 conducting simultaneously, reactor L1 electric current with
speed rises, and test capacitors C3 discharges.
When the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 turns off simultaneously, reactor L1 electric current with
speed declines, and test capacitors C3 charges.
After testing capacitor C3 has tested, discharged by resistance R2, when the voltage drop of testing capacitor C3 is low to moderate 100V, testing capacitor C3 and the second capacitor C2 parallel connection is discharged by resistance R2.
In test process, reactor L1 electric current can be made around the fluctuation of measuring current triangle by ring width method, and control ac frequency by changing ring width size.
Hand switch K1 has short circuit trip protection function and maintenance power down function.Contactor J1 is used for fault auto-breaking and testing capacitor C3 electric discharge automatic circuit break function.
Overcurrent and overvoltage is there is in pre-charge resistance R1 prevent transformer and capacitor in parallel with contactor J2 when hand switch K1 and contactor J1 normally opened contact close.After hand switch K1 and contactor J1 normally opened contact are closed, time delay 10 seconds splice grafting tentaculum J2 normally opened contact again, because 380V/380V automatic coupling voltage regulator position is indefinite, closes contactor J2 without DC voltage detection method in the present invention.
380V/380V automatic coupling voltage regulator, for adjusting direct current power source voltage, makes the DC voltage of test capacitors C3 reach demand voltage.The VD of the first rectifier bridge is the power attenuation that 100V can supplement major loop.
The direct current of the second rectifier bridge exports and is used for powering to ac generator, and supplements the power attenuation of major loop.
Embodiment 2: as shown in Figure 1, a kind of flexible DC power transmission dedicated capacitor ripple current detects main circuit, comprise power module, protection module, the first rectifier bridge, the second rectifier bridge, ac generator and discharge module, power module is divided into two-way after protection module, one tunnel is connected with the first rectifier bridge after stepup transformer through pressure regulator, and an output terminal a1 of the first rectifier bridge is as an incoming end c1 of capacitor to be detected; Another road is connected with the second rectifier bridge after reducing transformer, and the second rectifier bridge is connected with ac generator, and one end that ac generator is connected with the second rectifier bridge is connected with another output terminal a2 of the first rectifier bridge; The other end of ac generator is as another incoming end c2 of capacitor to be detected, and discharge module is connected between incoming end c1 and incoming end c2.
Claims (9)
1. a flexible DC power transmission dedicated capacitor ripple current detects main circuit, it is characterized in that: comprise power module (1), protection module (2), the first rectifier bridge (5), the second rectifier bridge (8), ac generator (6) and discharge module (7), power module (1) is divided into two-way after protection module (2), one tunnel is connected with the first rectifier bridge (5) after stepup transformer (4) through pressure regulator (3), and an output terminal a1 of the first rectifier bridge (5) is as an incoming end c1 of capacitor C3 to be detected; Another road is connected with the second rectifier bridge (8) after reducing transformer (9), and the second rectifier bridge (8) is connected with ac generator (6), and one end that ac generator (6) is connected with the second rectifier bridge (8) is connected with another output terminal a2 of the first rectifier bridge (5); The other end of ac generator (6) is as another incoming end c2 of capacitor C3 to be detected, and discharge module (7) is connected between incoming end c1 and incoming end c2.
2. a kind of flexible DC power transmission dedicated capacitor ripple current according to claim 1 detects main circuit, it is characterized in that: described power module (1) comprises two-way power supply, is respectively 380V three-phase alternating-current supply and 220V single phase alternating current power supply.
3. a kind of flexible DC power transmission dedicated capacitor ripple current according to claim 2 detects main circuit, it is characterized in that: described protection module (2) comprises hand switch K1, contactor J1 often leaves auxiliary contact, pre-charge resistance R1 and contactor J2 often opens auxiliary contact, one end of hand switch K1 is connected with 380V three-phase alternating-current supply and 220V single phase alternating current power supply respectively, the other end of hand switch K1 and contactor J1 often open auxiliary contact and pre-charge resistance R1 is sequentially connected in series, contactor J2 often opens auxiliary contact and pre-charge resistance R1 is connected in parallel, the other end of pre-charge resistance R1 is divided into two-way, one tunnel is connected with the first rectifier bridge (5) after stepup transformer (4) through pressure regulator (3), another road is connected with the second rectifier bridge (8) through reducing transformer (9).
4. a kind of flexible DC power transmission dedicated capacitor ripple current according to claim 3 detects main circuit, it is characterized in that: described pressure regulator (3) is 380V/380V automatic coupling voltage regulator, described stepup transformer (4) is 380V/850V stepup transformer, the primary side of 380V/380V pressure regulator is connected with the other end of pre-charge resistance R1, the secondary side of 380V/380V pressure regulator is connected with the primary side of 380V/850V stepup transformer, the secondary side of 380V/850V stepup transformer is connected with the first rectifier bridge (5), an output terminal a1 of the first rectifier bridge (5) is as an incoming end c1 of capacitor C3 to be detected, another output terminal a2 of the first rectifier bridge (5) is connected with one end of ac generator (6).
5. a kind of flexible DC power transmission dedicated capacitor ripple current according to claim 3 detects main circuit, it is characterized in that: between an output terminal a1 and another output terminal a2 of the first rectifier bridge (5) of the first rectifier bridge (5), be connected with the second capacitor C2.
6. a kind of flexible DC power transmission dedicated capacitor ripple current according to claim 3 or 4 detects main circuit, it is characterized in that: described reducing transformer (9) is 380V/75V reducing transformer, the primary side of 380V/75V reducing transformer is connected with the other end of pre-charge resistance R1, the secondary side of 380V/75V reducing transformer is connected with the second rectifier bridge (8), one end b1 of the second rectifier bridge (8) is connected with ac generator, the other end b2 ground connection of the second rectifier bridge (8); One end that ac generator (6) and the second rectifier bridge (8) are connected is connected with another output terminal a2 of the first rectifier bridge (5), and the other end of ac generator (1) is as another incoming end c2 of capacitor C3 to be detected.
7. a kind of flexible DC power transmission dedicated capacitor ripple current according to claim 6 detects main circuit, it is characterized in that: between an output terminal b1 and another output terminal b2 of the first rectifier bridge (5) of the second rectifier bridge (8), be connected with the first capacitor C1.
8. a kind of flexible DC power transmission dedicated capacitor ripple current according to claim 6 detects main circuit, it is characterized in that: described ac generator (6) comprises the first insulated gate bipolar transistor Q1, the second insulated gate bipolar transistor Q2, the first diode D1, the second diode D2 and reactor L1, the collector C of the first insulated gate bipolar transistor Q1 is connected with the output terminal b1 of the second rectifier bridge (1), the emitter E of the first insulated gate bipolar transistor Q1 is connected with the negative pole of the first diode D1, the plus earth of the first diode D1; The negative pole of the second diode D2 is connected with the collector C of the first insulated gate bipolar transistor Q1, the positive pole of the second diode D2 is connected with the collector C of the second insulated gate bipolar transistor Q2, the emitter E ground connection of the second insulated gate bipolar transistor Q2 as another incoming end c2 of capacitor C3 to be detected, reactor L1 is connected between the emitter E 1 of the first insulated gate bipolar transistor Q1 and the collector C of the second insulated gate bipolar transistor Q2.
9. a kind of flexible DC power transmission dedicated capacitor ripple current detects main circuit according to claim 1 or 5, it is characterized in that: described discharge module (7) comprises K switch 2 and resistance R2, be connected between incoming end c1 and incoming end c2 after K switch 2 and resistance R2 are connected in series.
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| CN106645880A (en) * | 2016-12-26 | 2017-05-10 | 珠海格力电器股份有限公司 | Capacitor ripple current estimation method and device, variable frequency air conditioner control method and device, frequency converter and variable frequency air conditioner |
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| CN109581193A (en) * | 2018-12-13 | 2019-04-05 | 歌尔股份有限公司 | Detection method, detection device and the computer storage medium of circuit filtering function |
| CN109581193B (en) * | 2018-12-13 | 2020-10-20 | 潍坊歌尔微电子有限公司 | Circuit filtering function detection method, circuit filtering function detection device and computer storage medium |
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Application publication date: 20160323 |