CN107135082A - A kind of system and method powered jointly using two power supply end equipments - Google Patents
A kind of system and method powered jointly using two power supply end equipments Download PDFInfo
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- CN107135082A CN107135082A CN201710292888.4A CN201710292888A CN107135082A CN 107135082 A CN107135082 A CN 107135082A CN 201710292888 A CN201710292888 A CN 201710292888A CN 107135082 A CN107135082 A CN 107135082A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/10—Current supply arrangements
Abstract
The invention discloses a kind of system and method powered jointly using two power supply end equipments, powered to solve traditional POE because single power supply end equipment is unstable to cause the inoperable problem of receiving end equipment.The system is by the first power supply end equipment, the second power supply end equipment and receiving end equipment composition；The first power supply end equipment and the second power supply end equipment connect the first power supply network interface and the second power supply network interface of the power supply end equipment respectively, for providing another road electric power；The receiving end equipment includes：First by electric detecting unit, for feedback information to the power supply end equipment；Second by electric detecting unit, for feedback information to the power supply end equipment；Control module is changed by TURP, while being connected with first by electric detecting unit and second by electric detecting unit, for controlling described first by electric detecting unit and the described second switch powered by electric detecting unit rear end application circuit.Using the present invention, transmission backup can be made not interrupt.
Description
Technical field
Powered field the present invention relates to POE, more particularly to a kind of system powered jointly using two power supply end equipments and
Method.
Background technology
POE is a kind of technology transmitted data to rear end equipment using netting twine of powering and powered simultaneously, makes receiving end equipment
(abbreviation PD) need not be additionally provided power and can just work, as shown in figure 1, power supply end equipment (abbreviation PSE) is originally used for transmission
Wherein two pairs of 4 pairs of lines realized in the additional 48V in net mouth transformer rear end voltage distal end PD powered.
In actual POE powers, power supply end equipment is likely to occur unstable situation, causes receiving end device powers down not
Can work.
As shown in Fig. 2 Fig. 2 is traditional POE output powers design signal
Power supply end equipment is connected with receiving end equipment by a power supply netting twine.And it is described power supply end equipment with it is described by electricity
End equipment all only has single network interface.
When power supply end equipment because network reason is stable, receiving end equipment does not receive the electric power that power supply end equipment is sent.
The situation of broken string occurs in system.
Existing POE power supply techniques are extremely unstable, there is certain limitation.
Publication No. CN105357017A patent provides a kind of system and method for stable POE supply voltages.Using
In based on POE technologies, regulation Power Source Equipment to the supply voltage of terminal power receiving equipment, detecting receiving voltage module with it is described
Being connected by electric module in terminal power receiving equipment, by the voltage of electric module described in detecting real-time, produces detecting data；Power receiving equipment
CPU is connected with the detecting receiving voltage module, is exported after handling the detecting data；Power supply unit CPU with it is described
Power receiving equipment CPU connections, the detecting data after reception processing, and the detecting data after the processing is further located
Reason, produces control signal；Power supply of the feedback regulation module respectively with the power supply unit CPU, Power Source Equipment is connected,
The supply voltage of the power supply is adjusted according to the control signal.The invention utilizes defeated by CPU regulation voltages
Go out, but it is extremely unstable.
The content of the invention
The technical problem to be solved in the present invention purpose is to provide a kind of is using what two power supply end equipments were powered jointly
System and method, power solving traditional POE causes receiving end equipment to work because single power supply end equipment is unstable
The problem of.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of system powered jointly using two power supply end equipments, by the first power supply end equipment, the second power supply end equipment
And receiving end equipment composition；
The first power supply end equipment, connects the first power supply network interface of the power supply end equipment, for providing electric power all the way；
The second power supply end equipment, connects the second power supply network interface of the power supply end equipment, for providing another road electricity
Power；
The receiving end equipment includes：
First by electric detecting unit, for feedback information to the power supply end equipment；
Second by electric detecting unit, for feedback information to the power supply end equipment；
Control module is changed by TURP, while being connected with first by electric detecting unit and second by electric detecting unit, for controlling
Described first is made by electric detecting unit and the described second switch powered by electric detecting unit rear end application circuit.
Further, it is described first power supply end equipment with second power supply end equipment respectively by one power supply netting twine with it is described by
Electric end equipment connection.
Further, described first by electric detecting unit by the first control line with it is described by TURP change control module connect
Connect, described second is changed control module by TURP and be connected by the second control line by electric detecting unit with described.
Further, the first power supply end equipment and the second power supply end equipment are additionally operable to according to by described first
By electric detecting unit and described second by electric detecting unit detecting carrier wave feedack output power.
Further, described first by electric detecting unit and described second by after electric detecting unit feedback information by described
The electric power that one power supply end equipment and the second power supply end equipment are provided is changed control module described in reaching by TURP.
Further, it is described to be changed control module specifically for judging described first by electric detecting unit and described by TURP
Two by electric detecting unit power whether in predetermined power scope；
Changed control module if so, described by TURP and powered all the way by pre-set priority selection, closed another road and power；
If it is not, judge described first by electric detecting unit and described second by electric detecting unit whether not in predetermined power
Scope, if so, closing duplex feeding；Otherwise, the power supply all the way in the range of predetermined power is opened.
Further, it is described to be changed control module by TURP and be additionally operable to when the supply voltage that detect current power supply end equipment is low
When predeterminated voltage, open another road end equipment of powering and be powered.
A kind of method powered jointly using two power supply end equipments, including step：
S1, the two-way electric power for obtaining end equipment of being powered from two；
S2, judge described first by electric detecting unit and described second by electric detecting unit power whether in default work(
Rate scope；
Changed control module if so, described by TURP and powered all the way by pre-set priority selection, closed another road and power；
If it is not, judge described first by electric detecting unit and described second by electric detecting unit whether not in predetermined power
Scope, if so, closing duplex feeding；Otherwise, the power supply all the way in the range of predetermined power is opened；
Further, in addition to step：
S3, when the supply voltage for detecting current power supply end equipment is less than predeterminated voltage, open another road feeder ear and set
It is standby to be powered.
Further, step S1 is specifically included：
Detecting carrier wave and feedback information from two power supply end equipments are obtained to described two power supply end equipments；
Obtain two-way electric power of described two power supply end equipments according to the transmission of feedback information.
It is of the invention compared with traditional technology, have the following advantages：
Using two power supply end equipment joint power supplies, lift the power of power supply and transmission backup can be made not interrupt.
Brief description of the drawings
Fig. 1 is POE power supply the principle figures；
Fig. 2 is traditional POE output powers design diagram；
Fig. 3 is a kind of system construction drawing powered jointly using two power supply end equipments that embodiment one is provided；
Fig. 4 is a kind of method flow diagram powered jointly using two power supply end equipments that embodiment two is provided；
Fig. 5 is a kind of method flow diagram powered jointly using two power supply end equipments that embodiment three is provided；
Fig. 6 is a kind of method flow diagram powered jointly using two power supply end equipments that example IV is provided.
Embodiment
The following is specific embodiment of the invention and with reference to accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
Embodiment one
A kind of system powered jointly using two power supply end equipments is present embodiments provided, as shown in figure 3, being supplied by first
Electric end equipment, the second power supply end equipment and receiving end equipment composition, including：
First power supply end equipment 11, connects the first power supply network interface of the power supply end equipment, for providing electric power all the way；
Second power supply end equipment 12, connects the second power supply network interface of the power supply end equipment, for providing another road electric power；
The receiving end equipment includes：
First by electric detecting unit 21, for feedback information to the power supply end equipment；
Second by electric detecting unit 22, for feedback information to the power supply end equipment；
Control module 23 is changed by TURP, while being connected with first by electric detecting unit and second by electric detecting unit, is used for
Described first is controlled to be switched by electric detecting unit and described second by the power supply of electric detecting unit rear end application circuit 24.
POE is a kind of technology transmitted data to rear end equipment using netting twine of powering and powered simultaneously, makes receiving end equipment
(abbreviation PD) need not be additionally provided power and can just work, as shown in figure 1, power supply end equipment (abbreviation PSE) is originally used for transmission
Wherein two pairs of 4 pairs of lines realized in the additional 48V in net mouth transformer rear end voltage distal end PD powered.
POE refer to existing Ethernet Cat.5 wiring architecture do not make any changes in the case of, for some
While IP-based terminal (such as IP telephone machine, wireless local network connecting point AP, web camera) transmission data-signal, also
The technology of direct current supply can be provided for this kind equipment.POE technologies can ensure existing while ensuring that existing structureization wiring is safe
There is the normal operation of network, cost is reduced to greatest extent.
POE is also referred to as electric power system or active Ethernet based on LAN, is also called POE for short sometimes,
This be utilize existing standard Ethernet transmission cable while transmission data and electrical power newest standards specification, and maintain with
Existing Ethernet system and the compatibility of user.
The present embodiment is there are two power supply end equipments with tradition POE electric power system differences.
In the present embodiment, power supply end equipment and receiving end equipment are connected by two power supply netting twines, traditional POE electric power systems
Only one power supply netting twine.
In the present embodiment, power supply end equipment includes the first power supply power supply end equipment 22 of end equipment 21 and second.
The POE of conventional art only one of which of powering is powered end equipment, when network signal is bad, it may appear that unstable feelings
Condition.
In the present embodiment, the first power supply power supply of end equipment 11 and second end equipment 12 is respectively by a power supply netting twine and by electricity
End equipment is connected.
The first power supply power supply of end equipment 11 and second end equipment 12 is additionally operable to according to process first by electric detecting unit 21
Detect carrier wave feedack output power.
The first power supply power supply of end equipment 11 and second end equipment 12 sends detecting carrier wave to first by netting twine of powering respectively
By electric detecting unit 21 and second by electric detecting unit 22, now first by electric detecting unit 21 and second by electric detecting unit 22
Feedback information is understood to the first power supply power supply end equipment 12 of end equipment 11 and second,.The first power supply feeder ear of end equipment 11 and second
Equipment 12 adjusts according to feedack and exports the electric power of response.
In the present embodiment, the first power supply power supply of end equipment 11 and second end equipment 12 constantly sends detecting carrier wave, after detecting
Whether end has receiving end equipment.
If there is receiving end equipment detecting rear end, detecting carrier wave is single by electricity detecting by electric detecting unit 21 and second by first
Member 21, and return signal, to the first power supply power supply end equipment 12 of end equipment 11 and second, the signal can be because of receiving end equipment not
It is different together.The signal frequency of return and response time are by decision receiving end equipment by electrical power.
In the present embodiment, receiving end equipment include first by electric detecting unit 21 and second by electric detecting unit 22 and by
TURP changes control module 23, backend application circuit 24.
First is connected by one end of electric detecting unit 21 with a network interface of receiving end equipment, and second by electric detecting unit 22
One end be connected with another network interface of receiving end equipment.First is single by electricity detecting by the other end of electric detecting unit 21 and second
Member 22 is connected with being changed control module 23 by TURP.First by the 3rd end of electric detecting unit 21 and second by electric detecting unit 22
3rd end is also connected with backend application circuit 24 simultaneously.
In the present embodiment, two are changed into from traditional one by electric detecting unit.
First is connected by electric detecting unit 21 by the first control line with being changed the control module of control module 23 by TURP, and second
It is connected by electric detecting unit 22 by the second control line with being changed control module 23 by TURP.
First is set by electric detecting unit 21 and second by electric detecting unit 22 for feedback information to first feeder ear
Standby 11 and the second power supply end equipment 12, make power supply end equipment by power requirement output voltage and electric current and overcurrent protection.
First by electric detecting unit 21 and second by after the electric feedback information of detecting unit 22 by first power supply end equipment 11 and
The electric power that second power supply end equipment 12 is provided is reached is changed control module 23 by TURP.
In the present embodiment, compared with traditional POE power supply techniques, add and changed control module 23 by TURP.
Traditional POE only one of which is powered end equipment, therefore only electric power all the way, and the present embodiment has two power supply netting twines,
Therefore there is two-way electric power, being changed control module 23 by TURP can select wherein that electric power is powered all the way.
In the present embodiment, by TURP change control module 23 be used for control first detected by electric detecting unit 21 and second by electricity
The switch of the rear end application circuit 24 of unit 22 power supply.
Specifically for judging whether first preset by electric detecting unit 21 and second by the power of electric detecting unit 22
In power bracket；
Powered all the way by pre-set priority selection if so, being changed control module 23 by TURP, close another road and power；
If it is not, judge first by electric detecting unit 21 and second by electric detecting unit 22 whether not in predetermined power model
Enclose, if so, closing duplex feeding；Otherwise, the power supply all the way in the range of predetermined power is opened.
If specifically, two power reguirements that system is satisfied by by electric detecting unit, being changed control module by TURP will be by setting
Fixed priority selection is wherein powered all the way, is closed another road and is powered；If two contribution powers by electric detecting unit are discontented with
Pedal system requirement, is changed control module by TURP and closes two-way and do not powered to the back-end by electric detecting unit, receiving end equipment not work
Make；If two are only met system power requirement all the way by electric detecting unit, satisfaction requirement will be opened by being changed control module by TURP
Its rear end application circuit is powered by electric detecting unit all the way and close another Lu Shou electricity detecting units.
In the present embodiment, changed control module 23 by TURP and be additionally operable to when the supply voltage for detecting current power supply end equipment is low
When predeterminated voltage, open another road end equipment of powering and be powered.
System normal operation, when the power supply end equipment currently powered is stopped power supply, being changed control module 23 by TURP will detect
The voltage of coming is supplied by electric detecting unit.When magnitude of voltage drops to certain degree, being changed control module 23 by TURP will open another
Switched all the way by electric detecting unit；If this is had electric power regular supply by electric detecting unit all the way, system will continue normal work,
Keep communication continuous.
Powered and be connected with receiving end equipment using two power supply end equipments, wherein one as backup, make receiving end equipment
Power supply is uninterrupted.
And receiving end equipment introduces and is changed control module by TURP, can be set and be supplied according to the two priority classes feeder ear of setting
The priority orders of electricity.
Embodiment two
A kind of method powered jointly using two power supply end equipments is present embodiments provided, as shown in figure 4, including step
Suddenly：
S11：Obtain the two-way electric power from two power supply end equipments；
S12：Judge first by electric detecting unit and second by electric detecting unit power whether in predetermined power scope；
Changed control module if so, described by TURP and powered all the way by pre-set priority selection, closed another road and power；
If it is not, judge described first by electric detecting unit and described second by electric detecting unit whether not in predetermined power
Scope, if so, closing duplex feeding；Otherwise, the power supply all the way in the range of predetermined power is opened.
The method that prior art is powered is simultaneously while the technology powered using a netting twine to receiving end equipment transmission data
Method.The POE of conventional art only one of which of powering is powered end equipment, when network signal is bad, it may appear that unstable situation.
Power supply end equipment in the present embodiment becomes two by traditional one, and the electric power of transmission is two-way electric power, two
The two-way electric power from power supply end equipment transmission is obtained by electric detecting unit.
Also accordingly become two by electric detecting unit, therefore receive two-way electric power respectively.
, can be because unstable networks cause power-off due to the power supply end equipment only one of which of prior art, the present embodiment is carried
For two power supply end equipments, when the currently unstable power of power supply end equipment transmission, another road power supply can be opened.
In the present embodiment, if two power reguirements that system is satisfied by by electric detecting unit, being changed control module by TURP will
Wherein powered all the way by the priority selection of setting, close another road and power；If two contribution powers by electric detecting unit are equal
System requirements is unsatisfactory for, control module is changed by TURP and closes not powered to the back-end by electric detecting unit for two-way, receiving end equipment
Do not work；If two are only met system power requirement all the way by electric detecting unit, satisfaction will be opened by being changed control module by TURP
It is required that its rear end application circuit is powered by electric detecting unit all the way and close another Lu Shou electricity detecting units.
Powered and be connected with receiving end equipment using two power supply end equipments, wherein one as backup, make receiving end equipment
Power supply is uninterrupted.
Embodiment three
A kind of method powered jointly using two power supply end equipments is present embodiments provided, as shown in figure 5, including step
Suddenly：
S21：Obtain the two-way electric power from two power supply end equipments；
S22：Judge first by electric detecting unit and second by electric detecting unit power whether in predetermined power scope；
Changed control module if so, described by TURP and powered all the way by pre-set priority selection, closed another road and power；
If it is not, judge described first by electric detecting unit and described second by electric detecting unit whether not in predetermined power
Scope, if so, closing duplex feeding；Otherwise, the power supply all the way in the range of predetermined power is opened.
S23：When the supply voltage for detecting current power supply end equipment is less than predeterminated voltage, opens another road feeder ear and set
It is standby to be powered.
It is with the difference of embodiment two, in addition to step S23.
Specifically, system normal operation, when the power supply end equipment currently powered is stopped power supply, control module 23 is changed by TURP
It will detect and supplied the voltage of coming by electric detecting unit.When magnitude of voltage drops to certain degree, being changed control module 23 by TURP will
Open the switch of another Lu Shou electricity detecting units；If this is had electric power regular supply by electric detecting unit all the way, system will continue just
Often work, keeps communication continuous.
Powered and be connected with receiving end equipment using two power supply end equipments, wherein one as backup, make receiving end equipment
Power supply is uninterrupted.
Example IV
A kind of method powered jointly using two power supply end equipments is present embodiments provided, as shown in fig. 6, including step
Suddenly：
S31：Detecting carrier wave and feedback information from two power supply end equipments are obtained to two power supply end equipments；
S32：Obtain two-way electric power of two power supply end equipments according to transmission of feedback information；
S33：Judge first by electric detecting unit and second by electric detecting unit power whether in predetermined power scope；
Changed control module if so, described by TURP and powered all the way by pre-set priority selection, closed another road and power；
If it is not, judge described first by electric detecting unit and described second by electric detecting unit whether not in predetermined power
Scope, if so, closing duplex feeding；Otherwise, the power supply all the way in the range of predetermined power is opened.
S34：When the supply voltage for detecting current power supply end equipment is less than predeterminated voltage, opens another road feeder ear and set
It is standby to be powered.
The present embodiment is that step S11 specifically includes step S31 and step S32 with implementing two, three differences.
Power supply end equipment has two, and receiving end equipment is had two by electric detecting unit.When the module hair of power supply end equipment
When sending detecting carrier wave, whether detecting rear end has receiving end equipment.
If there is receiving end equipment detecting rear end, detecting carrier wave is by two by electric detecting unit, and return signal is to powering
End equipment, the signal can be because two by the different and different of electric detecting unit.The signal frequency of return and response time will determine by
Electric end equipment by electrical power.
Because power supply network interface uses two, power supply end equipment increases to two, and two are also added to by electric detecting unit, by
Electric detecting unit is after completing to be asked by electricity, and the electric power that power supply end equipment is provided by netting twine will be by two by electric detecting unit
It is transmitted to and is changed control module by TURP.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (10)
1. a kind of system powered jointly using two power supply end equipments, it is characterised in that by the first power supply end equipment, second supplies
Electric end equipment and receiving end equipment composition；
The first power supply end equipment, connects the first power supply network interface of the power supply end equipment, for providing electric power all the way；
The second power supply end equipment, connects the second power supply network interface of the power supply end equipment, for providing another road electric power；
The receiving end equipment includes：
First by electric detecting unit, for feedback information to the power supply end equipment；
Second by electric detecting unit, for feedback information to the power supply end equipment；
Control module is changed by TURP, while being connected with described first by electric detecting unit and described second by electric detecting unit, is used
In control described first by electric detecting unit and the described second switch powered by electric detecting unit rear end application circuit.
2. a kind of system powered jointly using two power supply end equipments according to claim 1, it is characterised in that described
First power supply end equipment is connected by a power supply netting twine with the receiving end equipment respectively with the described second power supply end equipment.
3. a kind of system powered jointly using two power supply end equipments according to claim 1, it is characterised in that described
First is changed control module by TURP and is connected by the first control line by electric detecting unit with described, and described second by electric detecting unit
Changed control module with described by the second control line by TURP and be connected.
4. a kind of system powered jointly using two power supply end equipments according to claim 1, it is characterised in that described
First power supply end equipment and the second power supply end equipment be additionally operable to according to by described first by electric detecting unit and described the
Two by electric detecting unit detecting carrier wave feedack output power.
5. a kind of system powered jointly using two power supply end equipments according to claim 1, it is characterised in that described
First by electric detecting unit and described second by after electric detecting unit feedback information by the described first power supply end equipment and described the
The electric power that two power supply end equipments are provided is changed control module described in reaching by TURP.
6. a kind of system powered jointly using two power supply end equipments according to claim 1, it is characterised in that described
By TURP change control module specifically for judge described first by electric detecting unit and described second by electric detecting unit power
Whether in predetermined power scope；
Changed control module if so, described by TURP and powered all the way by pre-set priority selection, closed another road and power；
If it is not, judge described first by electric detecting unit and described second by electric detecting unit whether not in predetermined power model
Enclose, if so, closing duplex feeding；Otherwise, the power supply all the way in the range of predetermined power is opened.
7. a kind of system powered jointly using two power supply end equipments according to claim 1, it is characterised in that described
Control module is changed by TURP to be additionally operable to, when the supply voltage for detecting current power supply end equipment is less than predeterminated voltage, open another
Road end equipment of powering is powered.
8. a kind of method powered jointly using two power supply end equipments, it is characterised in that including step：
S1, the two-way electric power for obtaining end equipment of being powered from two；
S2, judge described first by electric detecting unit and described second by electric detecting unit power whether in predetermined power model
Enclose；
Changed control module if so, described by TURP and powered all the way by pre-set priority selection, closed another road and power；
If it is not, judge described first by electric detecting unit and described second by electric detecting unit whether not in predetermined power model
Enclose, if so, closing duplex feeding；Otherwise, the power supply all the way in the range of predetermined power is opened.
9. a kind of method powered jointly using two power supply end equipments according to claim 8, it is characterised in that also wrap
Include step：
S3, when the supply voltage for detecting current power supply end equipment is less than predeterminated voltage, open another road end equipment of powering and enter
Row power supply.
10. a kind of method powered jointly using two power supply end equipments according to claim 8, it is characterised in that step
Rapid S1 is specifically included：
Detecting carrier wave and feedback information from two power supply end equipments are obtained to described two power supply end equipments；
Obtain two-way electric power of described two power supply end equipments according to the transmission of feedback information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710292888.4A CN107135082A (en) | 2017-04-28 | 2017-04-28 | A kind of system and method powered jointly using two power supply end equipments |
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| CN201710292888.4A CN107135082A (en) | 2017-04-28 | 2017-04-28 | A kind of system and method powered jointly using two power supply end equipments |
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| CN201710292888.4A Pending CN107135082A (en) | 2017-04-28 | 2017-04-28 | A kind of system and method powered jointly using two power supply end equipments |
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| WO2019100280A1 (en) * | 2017-11-23 | 2019-05-31 | 华为技术有限公司 | Power receiving circuit apparatus |
| CN112350832A (en) * | 2019-08-08 | 2021-02-09 | 宏正自动科技股份有限公司 | Power supply system and power receiving device thereof |
| CN112684384A (en) * | 2020-11-18 | 2021-04-20 | 杭州士兰微电子股份有限公司 | Power receiving connection detection method and power supply device in Ethernet power supply system |
| CN112821404A (en) * | 2021-03-09 | 2021-05-18 | 广东电网有限责任公司 | Power supply system and method based on power electronic transformer |
| CN114157518A (en) * | 2021-10-20 | 2022-03-08 | 浙江华创视讯科技有限公司 | Power supply system, power supply control method, electronic device, and storage medium |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019100280A1 (en) * | 2017-11-23 | 2019-05-31 | 华为技术有限公司 | Power receiving circuit apparatus |
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| CN112350832B (en) * | 2019-08-08 | 2022-12-09 | 宏正自动科技股份有限公司 | Power supply system and power receiving device thereof |
| CN112684384A (en) * | 2020-11-18 | 2021-04-20 | 杭州士兰微电子股份有限公司 | Power receiving connection detection method and power supply device in Ethernet power supply system |
| CN112821404A (en) * | 2021-03-09 | 2021-05-18 | 广东电网有限责任公司 | Power supply system and method based on power electronic transformer |
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Application publication date: 20170905 |