CN109510624A - A kind of airborne equipment high voltage digital-to-analogue conversion and verifying attachment - Google Patents
A kind of airborne equipment high voltage digital-to-analogue conversion and verifying attachment Download PDFInfo
- Publication number
- CN109510624A CN109510624A CN201811231844.1A CN201811231844A CN109510624A CN 109510624 A CN109510624 A CN 109510624A CN 201811231844 A CN201811231844 A CN 201811231844A CN 109510624 A CN109510624 A CN 109510624A
- Authority
- CN
- China
- Prior art keywords
- circuit
- high voltage
- digital
- analogue conversion
- reference voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/10—Calibration or testing
- H03M1/1071—Measuring or testing
- H03M1/1095—Measuring or testing for ac performance, i.e. dynamic testing
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
Abstract
The present invention provides a kind of airborne equipment high voltage digital-to-analogue conversion and verifying attachments, after digital signal inputs adjustable precision reference voltage source, enter high voltage D/A converting circuit from adjustable precision reference voltage source output terminal, the output end of high voltage D/A converting circuit connects high voltage digital-to-analogue conversion product test circuit；The present invention can guarantee the reliability of airborne high voltage signal conversion, effectively overcome and lack the simple and effective limitation reliably examined to high voltage signal digital-to-analogue conversion result；Design principle of the present invention is reliable, and design circuit form is realized simply, has very extensive application prospect.
Description
Technical field
The present invention relates to airborne equipment technical fields, are related to a kind of airborne chromacoder.
Background technique
It is carried out in signals transmission between airborne equipment, digital-to-analogue conversion is in very important position, especially in portion
The digital-to-analogue conversion that high voltage signal is also carried out between point airborne equipment, to the set function of completing these airborne equipments play to
Close important role.
Digital-to-analogue conversion in prior art device is mostly low-voltage digital-to-analogue conversion, and such digital-analog convertion method is only limitted to equipment
Between low-voltage digital-to-analogue conversion transmission.It is often more multiple when needing to carry out digital-to-analogue conversion transmission to the airborne signal of high voltage
It is miscellaneous, and it be easy to cause circuit imbalance that circuit is made cut-off saturated phenomenon occur, significant limitation is brought to design, and to high electricity
The digital-to-analogue conversion result of pressure lacks simple and effective inspection, the especially verification to multichannel high voltage, reduces airborne equipment
The reliability of high voltage digital-to-analogue conversion.This is in place of the deficiencies in the prior art.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of airborne equipment high voltage digital-to-analogue conversion and examines dress
It sets.
It is an object of the present invention to for often more multiple when needing to the progress digital-to-analogue conversion transmission of high voltage airborne signal
It is miscellaneous, significant limitation is brought to design, and simple and effective inspection is lacked to the digital-to-analogue conversion result of high voltage, reduced
The problems such as reliability of airborne equipment high voltage digital-to-analogue conversion, proposes a kind of airborne equipment high voltage digital-to-analogue conversion and examines dress
It sets, to solve the above technical problems.
The technical solution adopted by the present invention to solve the technical problems is:
The airborne equipment high voltage digital-to-analogue conversion and verifying attachment, including adjustable precision reference voltage source, high voltage number
Analog conversion circuit and high voltage digital-to-analogue conversion product test circuit, after digital signal inputs adjustable precision reference voltage source, from can
Accurate reference voltage output end is adjusted to enter high voltage D/A converting circuit, the output end of high voltage D/A converting circuit connects high
Voltage digital-to-analogue conversion product test circuit；
The adjustable precision reference voltage source includes high precision operating amplifier and Parameter adjustable configuration circuit, and high-precision is transported
Calculate the signal output end Connecting quantity tunable configuration circuit of amplifier；High precision operating amplifier and Parameter adjustable configuration circuit produce
Raw adjustable precision reference voltage, and high voltage D/A converting circuit is sent to using this accurate reference voltage as reference voltage
In.
The high voltage D/A converting circuit includes first order D/A converting circuit, channel control switching circuit, second
Grade D/A converting circuit and high voltage amplification output circuit, first order D/A converting circuit interface channel control switching circuit lead to
Road control switching circuit output end is electrically connected second level D/A converting circuit, the output end electrical connection of second level D/A converting circuit
High voltage amplification output circuit；Wherein, the parameter of the first order D/A converting circuit and adjustable precision reference voltage source can
Circuits electrical connection is deployed, high voltage amplification output circuit is output to digital-to-analogue conversion product test circuit；Pass through high voltage digital-to-analogue
The circuits at different levels of conversion circuit after successively carrying out first order digital-to-analogue conversion to airborne required high voltage signal, carry out channel
Switching control exports the high voltage of amplification after the digital-to-analogue conversion of the second level, transmits transformation result finally by driving.
The high voltage digital-to-analogue conversion product test circuit includes window comparator circuit, verification channel control circuit and verification
As a result triggering forms circuit, and high voltage appearance amplification output circuit output end is electrically connected window comparator circuit, window comparator circuit
Output end connection verification channel control circuit, test channel control circuit output end connection check results trigger to form circuit；
Shape is triggered by the window comparator circuit of high voltage digital-to-analogue conversion product test circuit, verification channel control circuit and check results
At circuit, connection control is successively carried out to high voltage digital-to-analogue conversion result, triggering forms, and finally sends out verification result
It goes.
The verification channel control circuit with high voltage digital-to-analogue conversion product test circuit connection；By the way that tandem type is arranged
Verification channel control circuit verifies multichannel high voltage transformation result.
The beneficial effects of the present invention are generate high using high precision operating amplifier match parameter tunable configuration circuit
Precision voltage reference, and the precision voltage reference is transmitted to high voltage D/A converting circuit, turn as its first order digital-to-analogue
The accurate reference voltage changed；
The high voltage signal that airborne equipment is sent by the first order D/A converting circuit of high voltage D/A converting circuit
Benchmark digital signal be converted into analog voltage signal successively converted channel control switching circuit, second level D/A converting circuit,
Digital-to-analogue conversion is effectively performed in high voltage amplification output circuit, high voltage signal needed for realizing airborne equipment, logical to conversion
Effective control in road finally realizes high voltage signal digital-to-analogue conversion driving output to the precision controlling of analog-digital conversion process；
By channel control switching circuit, the airborne high voltage signal conversion and control to required conversion can be realized, with true
Protect the in due course reliable transmission of airborne high voltage signal；
Airborne high voltage digital signal can be acquired by second level D/A converting circuit, is produced in conjunction with first order digital-to-analogue conversion
Raw high voltage reference reference voltage realizes the conversion of digital-to-analogue conversion electric current to voltage.To guarantee airborne high voltage digital signal
To analog signal convert, improve conversion accuracy；
By high voltage amplification output circuit drive can be amplified to analog signal transformation result to airborne digital signal
Dynamic output carries out high voltage signal matching transmission with other airborne equipments to realize；
It, being capable of accurate validation high voltage signal digital-to-analogue conversion result by high voltage digital-to-analogue conversion product test circuit.
It can be seen that compared with prior art, the present invention can guarantee the reliability of airborne high voltage signal conversion, effectively
It overcomes and the simple and effective limitation reliably examined is lacked to high voltage signal digital-to-analogue conversion result.In addition, the present invention designs original
Reason is reliable, and design circuit form is realized simply, has very extensive application prospect.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of airborne equipment high voltage digital-to-analogue conversion provided by the invention and the method for inspection.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
The present invention is a kind of airborne equipment high voltage digital-to-analogue conversion and verifying attachment；The airborne equipment high voltage digital-to-analogue conversion
And the method for inspection can not only effectively to airborne high voltage signal carry out digital-to-analogue conversion, and can be improved digital-to-analogue conversion precision and
The reliability of digital-to-analogue conversion reduces other influences of the airborne signal to the digital-to-analogue conversion, while can be to high voltage digital-to-analogue conversion
It exports result and carries out effective reliable authentication.
A kind of airborne equipment high voltage digital-to-analogue conversion and verifying attachment, including adjustable precision reference voltage source, high voltage number
Analog conversion circuit and high voltage digital-to-analogue conversion product test circuit, after digital signal inputs adjustable precision reference voltage source, from can
Accurate reference voltage output end is adjusted to enter high voltage D/A converting circuit, the output end of high voltage D/A converting circuit connects high
Voltage digital-to-analogue conversion product test circuit；
The adjustable precision reference voltage source includes high precision operating amplifier and Parameter adjustable configuration circuit, and high-precision is transported
Calculate the signal output end Connecting quantity tunable configuration circuit of amplifier；High precision operating amplifier and Parameter adjustable configuration circuit produce
Raw adjustable precision reference voltage, and high voltage D/A converting circuit is sent to using this accurate reference voltage as reference voltage
In.
The high voltage D/A converting circuit includes first order D/A converting circuit, channel control switching circuit, second
Grade D/A converting circuit and high voltage amplification output circuit, first order D/A converting circuit interface channel control switching circuit lead to
Road control switching circuit output end is electrically connected second level D/A converting circuit, the output end electrical connection of second level D/A converting circuit
High voltage amplification output circuit；Wherein, the parameter of the first order D/A converting circuit and adjustable precision reference voltage source can
Circuits electrical connection is deployed, high voltage amplification output circuit is output to digital-to-analogue conversion product test circuit；Pass through high voltage digital-to-analogue
The circuits at different levels of conversion circuit after successively carrying out first order digital-to-analogue conversion to airborne required high voltage signal, carry out channel
Switching control exports the high voltage of amplification after the digital-to-analogue conversion of the second level, transmits transformation result, solution finally by driving
It is often complex when having determined in the prior art to the progress digital-to-analogue conversion transmission of high voltage airborne signal, very overall situation is brought to design
Sex-limited defect.
The high voltage digital-to-analogue conversion product test circuit includes window comparator circuit, verification channel control circuit and verification
As a result triggering forms circuit, and high voltage appearance amplification output circuit output end is electrically connected window comparator circuit, window comparator circuit
Output end connection verification channel control circuit, test channel control circuit output end connection check results trigger to form circuit；
Shape is triggered by the window comparator circuit of high voltage digital-to-analogue conversion product test circuit, verification channel control circuit and check results
At circuit, connection control is successively carried out to high voltage digital-to-analogue conversion result, triggering forms, and finally sends out verification result
It goes, solves the limitation for lacking simple and effective inspection to high voltage digital-to-analogue conversion result verification in the prior art.
The high voltage digital-to-analogue conversion product test circuit further includes the high voltage window comparator circuit for result verification；
High voltage transformation result reliably can accurately be verified by the way that high voltage window comparator circuit is arranged.
The tandem type with high voltage digital-to-analogue conversion product test circuit connection verifies channel control circuit；Pass through setting
Tandem type verification channel control circuit verifies multichannel high voltage transformation result, and circuit form is simple, and design is real
Now facilitate.
As shown in Figure 1, a kind of airborne equipment high voltage digital-to-analogue conversion provided by the invention and verifying attachment, including adjustable essence
Close reference voltage source, the adjustable precision reference voltage source output terminal are connected with high voltage D/A converting circuit, the height
Voltage D/A converting circuit is connected with high voltage digital-to-analogue conversion product test circuit, the high voltage D/A converting circuit packet
It includes:
First order D/A converting circuit, the channel control switching circuit being electrically connected with the first order D/A converting circuit,
The second level D/A converting circuit being electrically connected with the channel control switching circuit, with the second level D/A converting circuit
The high voltage amplification output circuit of electrical connection.Wherein, the first order D/A converting circuit and adjustable precision reference voltage source
Electrical connection, high voltage amplification output circuit are electrically connected with digital-to-analogue conversion product test circuit；Pass through high voltage D/A converting circuit
Circuits at different levels, can successively carry out first order digital-to-analogue conversion, channel switching control, second to airborne required high voltage signal
Grade digital-to-analogue conversion, high voltage output send out transformation result finally by driving, solve in the prior art to high voltage
It is often complex when airborne signal progress digital-to-analogue conversion transmission, the defect of significant limitations is brought to design.
In the present embodiment, the adjustable precision reference voltage source includes: high precision operating amplifier, is transported with the high-precision
It calculates amplifier out point and connects Connecting quantity tunable configuration circuit；Using high precision operating amplifier and Parameter adjustable configuration electricity
Road can generate adjustable precision reference voltage, and be sent to first order digital-to-analogue conversion electricity for this accurate voltage as reference voltage
Road.
In the present embodiment, the high voltage digital-to-analogue conversion product test circuit includes: high voltage window comparator circuit, with institute
The verification channel control circuit for stating the electrical connection of high voltage window comparator circuit point, the output end with the verification channel control circuit
The check results of point electrical connection trigger to form circuit；Wherein the window comparator circuit is electrically connected with high voltage amplification output circuit
It connects, by the circuits at different levels of high voltage digital-to-analogue conversion product test circuit, high voltage digital-to-analogue conversion result can successively be carried out
Control, triggering formation are connected, and finally verification result is sent out, is solved in the prior art to high voltage digital-to-analogue conversion knot
Fruit verifies the limitation for lacking simple and effective inspection.It can be by high voltage transformation result by setting high voltage window comparator circuit
It is reliably accurately verified, and circuit form is simple, design is realized convenient.
In other embodiments, channel control switching circuit can also be using the switching control for having both simulation and mechanical function
System.
In the technical program, collected airborne high voltage is controlled into digital signal combination adjustable precision reference voltage source,
By two-stage digital-to-analogue conversion export, and will conversion output result by window comparator circuit, tandem type verify channel control electricity and
Check results trigger to form circuit progress real-time inspection, so as to solve in the prior art to count the airborne signal of high voltage
It is often complex when mould converting transmission, the defect of significant limitations is brought to design.It simultaneously can be reliable to transformation result progress
True verifying, to ensure reliability that collected airborne high voltage signal transmits between devices.
Claims (2)
1. a kind of airborne equipment high voltage digital-to-analogue conversion and verifying attachment, it is characterised in that:
The airborne equipment high voltage digital-to-analogue conversion and verifying attachment, including adjustable precision reference voltage source, high voltage digital-to-analogue turn
Circuit and high voltage digital-to-analogue conversion product test circuit are changed, after digital signal inputs adjustable precision reference voltage source, from adjustable essence
Close reference voltage source output terminal enters high voltage D/A converting circuit, and the output end of high voltage D/A converting circuit connects high voltage
Digital-to-analogue conversion product test circuit；
The adjustable precision reference voltage source includes high precision operating amplifier and Parameter adjustable configuration circuit, and high-accuracy arithmetic is put
The signal output end Connecting quantity tunable configuration circuit of big device；High precision operating amplifier and the generation of Parameter adjustable configuration circuit can
Accurate reference voltage is adjusted, and is sent in high voltage D/A converting circuit using this accurate reference voltage as reference voltage；
The high voltage D/A converting circuit includes first order D/A converting circuit, channel control switching circuit, the second series
Analog conversion circuit and high voltage amplification output circuit, first order D/A converting circuit interface channel control switching circuit, channel is cut
Change control circuit output end electrical connection second level D/A converting circuit, the high electricity of output end electrical connection of second level D/A converting circuit
Press amplification output circuit；Wherein, the first order D/A converting circuit and the Parameter adjustable of adjustable precision reference voltage source are matched
Circuits electrical connection, high voltage amplification output circuit are output to digital-to-analogue conversion product test circuit；Pass through high voltage digital-to-analogue conversion
The circuits at different levels of circuit switch over channel after successively carrying out first order digital-to-analogue conversion to airborne required high voltage signal
Control, after the digital-to-analogue conversion of the second level, exports the high voltage of amplification, transmits transformation result finally by driving；
The high voltage digital-to-analogue conversion product test circuit includes window comparator circuit, verification channel control circuit and check results
Triggering forms circuit, and high voltage appearance amplification output circuit output end is electrically connected window comparator circuit, window comparator circuit it is defeated
Outlet connection verification channel control circuit, the output end connection check results for testing channel control circuit trigger to form circuit；Pass through
Window comparator circuit, verification channel control circuit and the check results of high voltage digital-to-analogue conversion product test circuit trigger to form electricity
Road successively carries out connection control to high voltage digital-to-analogue conversion result, triggering forms, and finally sends out verification result.
2. airborne equipment high voltage digital-to-analogue conversion according to claim 1 and verifying attachment, it is characterised in that:
The verification channel control circuit with high voltage digital-to-analogue conversion product test circuit connection；It is verified by setting tandem type
Channel control circuit verifies multichannel high voltage transformation result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811231844.1A CN109510624B (en) | 2018-10-22 | 2018-10-22 | High-voltage digital-to-analog conversion and inspection device for airborne equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811231844.1A CN109510624B (en) | 2018-10-22 | 2018-10-22 | High-voltage digital-to-analog conversion and inspection device for airborne equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109510624A true CN109510624A (en) | 2019-03-22 |
| CN109510624B CN109510624B (en) | 2022-12-06 |
Family
ID=65745871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811231844.1A Active CN109510624B (en) | 2018-10-22 | 2018-10-22 | High-voltage digital-to-analog conversion and inspection device for airborne equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109510624B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009257A (en) * | 2021-02-26 | 2021-06-22 | 西安微电子技术研究所 | Simple and reliable power-on state detection circuit |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005086695A (en) * | 2003-09-10 | 2005-03-31 | Sanyo Electric Co Ltd | Analog-to-digital conversion circuit |
| US20060012501A1 (en) * | 2004-07-16 | 2006-01-19 | Seung-Chul Lee | Current-steering digital-to-analog converter |
| JP2010045553A (en) * | 2008-08-12 | 2010-02-25 | Yokogawa Electric Corp | Digital-analog conversion module |
| CN101701971A (en) * | 2009-10-24 | 2010-05-05 | 中北大学 | High-precision multichannel analog signal source |
| CN103391098A (en) * | 2013-07-25 | 2013-11-13 | 哈尔滨工业大学 | DAC (digital to analog conversion) circuit with high precision and large-current drive capability |
| CN203950229U (en) * | 2014-07-07 | 2014-11-19 | 南京工业大学 | DC high voltage increasing apparatus based on photoelectric control |
| CN106054092A (en) * | 2016-05-23 | 2016-10-26 | 广东电网有限责任公司佛山供电局 | GIS partial discharge sensor sensitivity tester |
| WO2018129882A1 (en) * | 2017-01-10 | 2018-07-19 | 京东方科技集团股份有限公司 | Digital-to-analog conversion circuit and method, source driver, and display device |
| CN108490382A (en) * | 2018-04-04 | 2018-09-04 | 山东计保电气有限公司 | High-voltage electric energy meter metering plate remote online method of calibration and system |
-
2018
- 2018-10-22 CN CN201811231844.1A patent/CN109510624B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005086695A (en) * | 2003-09-10 | 2005-03-31 | Sanyo Electric Co Ltd | Analog-to-digital conversion circuit |
| US20060012501A1 (en) * | 2004-07-16 | 2006-01-19 | Seung-Chul Lee | Current-steering digital-to-analog converter |
| JP2010045553A (en) * | 2008-08-12 | 2010-02-25 | Yokogawa Electric Corp | Digital-analog conversion module |
| CN101701971A (en) * | 2009-10-24 | 2010-05-05 | 中北大学 | High-precision multichannel analog signal source |
| CN103391098A (en) * | 2013-07-25 | 2013-11-13 | 哈尔滨工业大学 | DAC (digital to analog conversion) circuit with high precision and large-current drive capability |
| CN203950229U (en) * | 2014-07-07 | 2014-11-19 | 南京工业大学 | DC high voltage increasing apparatus based on photoelectric control |
| CN106054092A (en) * | 2016-05-23 | 2016-10-26 | 广东电网有限责任公司佛山供电局 | GIS partial discharge sensor sensitivity tester |
| WO2018129882A1 (en) * | 2017-01-10 | 2018-07-19 | 京东方科技集团股份有限公司 | Digital-to-analog conversion circuit and method, source driver, and display device |
| CN108490382A (en) * | 2018-04-04 | 2018-09-04 | 山东计保电气有限公司 | High-voltage electric energy meter metering plate remote online method of calibration and system |
Non-Patent Citations (2)
| Title |
|---|
| PARCIAK JAROSLAW等: ""Diagnostic and acceptance tests of AC long lengths high voltage power cables"", 《2016 IEEE INTERNATIONAL CONFERENCE ON HIGH VOLTAGE ENGINEERING AND APPLICATION (ICHVE)》 * |
| 蓝晓柯等: ""基于OMAP-L138的激光打标机控制系统设计"", 《科技通报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009257A (en) * | 2021-02-26 | 2021-06-22 | 西安微电子技术研究所 | Simple and reliable power-on state detection circuit |
| CN113009257B (en) * | 2021-02-26 | 2023-09-29 | 西安微电子技术研究所 | Simple and reliable power-on state detection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109510624B (en) | 2022-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104181462B (en) | Measuring circuit for breakover voltage drop of semiconductor switch device | |
| CN101403777A (en) | Resistive current tester for great current zinc oxide lightning arrester | |
| CN103954911A (en) | Breaker arcing starting time detection system and method | |
| CN109510624A (en) | A kind of airborne equipment high voltage digital-to-analogue conversion and verifying attachment | |
| CN104181441B (en) | One-phase earthing failure in electric distribution network Section Location based on model error | |
| CN104007384A (en) | Circuit breaker mechanical property test platform and test method | |
| CN103051062B (en) | Intelligent phase selection system and method for multifunctional measuring and control device | |
| CN102156224A (en) | Direct-current insulation monitoring equipment and insulation resistance value calculating method | |
| CN102445616B (en) | Interference simulating experimental method for vehicle DC power supply | |
| CN106325900A (en) | Design of burner for anti-fuse FPGA (Field Programmable Gate Array) | |
| CN102185591A (en) | Gate pulse generation device for testing power device of current transformation module | |
| CN204086385U (en) | A kind of high precision electric current transducer testing circuit | |
| CN107329071A (en) | A kind of performance test circuit, test device and the method for IGBT drivers | |
| CN104237856A (en) | Radar detection signal high-accuracy time-delay generating device and control method | |
| CN104316896A (en) | Method for calibrating errors of electric energy meter under influence of direct currents and even-order harmonic | |
| CN104749520A (en) | Measuring method and device of breaking time of circuit breaker | |
| CN102543647B (en) | Signal collecting device and method for aerosol time-of-flight mass spectrometer | |
| CN103995177A (en) | Power transformer neutral point direct current measurement and wave-recording device and detection method | |
| CN106099649B (en) | A kind of internet lightning rod and its method of testing | |
| CN106684831A (en) | Medium-voltage and short-circuit current rapid identification and on-off control device and control method thereof | |
| CN102707130A (en) | Method and device for determining arc suppression coil gear based on voltage signal | |
| CN104714127A (en) | Track circuit traction current interference resistance testing device based on virtual instrument | |
| CN104407316A (en) | Calibrating device and calibrating method based on discrete synchronous power sources | |
| CN201886123U (en) | Phase-selecting and switching-on tester | |
| CN109387751A (en) | A kind of line fault monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |