CN114039341A - Direct current load management device - Google Patents
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- CN114039341A CN114039341A CN202111124051.1A CN202111124051A CN114039341A CN 114039341 A CN114039341 A CN 114039341A CN 202111124051 A CN202111124051 A CN 202111124051A CN 114039341 A CN114039341 A CN 114039341A
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- 238000004146 energy storage Methods 0.000 claims abstract description 67
- 238000003745 diagnosis Methods 0.000 claims description 10
- 230000001012 protector Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 abstract description 13
- 230000005611 electricity Effects 0.000 description 27
- 238000000034 method Methods 0.000 description 10
- 230000009467 reduction Effects 0.000 description 7
- 239000002253 acid Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 208000003443 Unconsciousness Diseases 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a direct current load management device, belongs to the technical field of power management equipment, and solves the technical problem that the operation cost of communication is high in the prior art. A direct current load management device comprises a power supply access point, an energy storage device control circuit, a peak section power supply circuit and a valley section power supply circuit; the power supply access point is connected with the load through the peak section power supply circuit and the valley section power supply circuit respectively; the power supply access point is connected with the power supply input end of the energy storage device control circuit through the peak section power supply circuit and the valley section power supply circuit respectively; and the power supply output end of the energy storage control circuit is connected with a load.
Description
Technical Field
The invention relates to the technical field of power supply management equipment, in particular to a direct current load management device.
Background
With the development of technology, the number of base stations and data centers is increasing dramatically. 22/1/2021, the Ministry of industry and communications issues a statistical bulletin: the total number of nationwide communication base stations in 2020 is 931 ten thousand, the total number of 4G base stations in the whole year is increased by 90 thousand, the total number of 4G base stations is 575 ten thousand, the total number of newly-built 5G base stations is 60 ten thousand, 60 ten thousand 5G base stations are proposed in 2021, 71.8 ten thousand 5G base stations are opened, wherein China telecom China Unicom shares 33 ten thousand 5G base stations, 5G users grow at the speed of ten million users every month, and the number of 5G users in China is nearly 2 hundred million users at the end of 2020. For the density and power consumption of communication base stations, the 5G base stations are 3 to 4 times as many as the 4G base stations. 51 thousands of data centers in China in 2010 to 100 thousands in 2020, more than 3000 centers with cabinets in 2010 and 164 centers in 2010 to 300 centers at present.
Communication plays a significant role in national economy, the country requires communication speed to be increased, consumers require fee reduction, and operators feel unconscious due to the continuous increase of operation cost.
Therefore, the prior art has the technical problem of high operation cost of communication.
Disclosure of Invention
The invention aims to provide a direct current load management device to solve the technical problem that the operation cost of communication is high in the prior art.
The invention provides a direct current load management device, which comprises a power supply access point, an energy storage control circuit, a high peak section power supply circuit and a low valley section power supply circuit, wherein the power supply access point is connected with the energy storage control circuit;
the power supply access point is connected with a load through the peak section power supply circuit and the valley section power supply circuit respectively;
the power supply access point is connected with the power supply input end of the energy storage device control circuit through the peak section power supply circuit and the valley section power supply circuit respectively;
and the power output end of the energy storage control circuit is connected with a load.
Further, the peak period power supply circuit comprises a first time control module, a first relay, a first switching power supply and a second switching power supply;
the first time control module is connected with the control end of the first relay;
one end of the first relay is connected with the power supply access point, and the other end of the first relay is respectively connected with a load and a power supply input end of the energy accumulator control circuit;
the first switching power supply is positioned between the first relay and a load;
the second switching power supply is positioned between the first relay and the power supply input end of the energy storage control circuit.
Further, a diagnostic circuit is included;
the diagnostic circuit comprises a diagnostic module and a second relay;
one end of the diagnosis module is connected with the energy storage device control circuit, and the other end of the diagnosis module is connected with the control end of the second relay;
the second relay is connected in parallel with the first relay.
Further, the energy storage control circuit comprises an energy storage and a third relay;
the first control end of the third relay is connected with the first time control module, and the second control end of the third relay is connected with the second time control module;
the first path of the third relay is connected between the second switching power supply and the power input end of the energy accumulator, the second path of the third relay is connected between the power output end of the energy accumulator and the load, and the third path of the third relay is connected between the power output end of the low valley section power supply circuit and the power input end of the energy accumulator.
Further, the energy storage control circuit further comprises a delay module;
and the first control end of the third relay is connected with the first time control module through a delay module.
Further, the valley section power supply circuit comprises a second time control module and a fourth relay;
the second time control module is connected with the control end of the fourth relay;
one end of the fourth relay is connected with the power supply access point, and the other end of the fourth relay is respectively connected with the power supply input end of the energy storage control circuit and the load.
Furthermore, a metering module and safety equipment are arranged between the power supply access point and the peak section power supply circuit or the valley section power supply circuit.
Furthermore, a metering module and a safety device are arranged between the power supply access point and the diagnosis circuit.
Furthermore, the safety equipment comprises a lightning protection module, an over-voltage, under-voltage and over-current protector and an air switch.
Furthermore, a switch group is arranged between the power supply access point and the peak section power supply circuit or the valley section power supply circuit.
The invention provides a direct current load management device, which comprises a power supply access point, an energy storage control circuit, a high peak section power supply circuit and a low valley section power supply circuit, wherein the power supply access point is connected with the energy storage control circuit; the power supply access point is connected with the load through the peak section power supply circuit and the valley section power supply circuit respectively; the power supply access point is connected with the power supply input end of the energy storage device control circuit through the peak section power supply circuit and the valley section power supply circuit respectively; and the power supply output end of the energy storage control circuit is connected with a load.
By adopting the direct-current load management device provided by the invention, when a power supply at a power consumption valley section (namely a time period with lowest electricity price) charges the energy storage control circuit through the power supply circuit at the valley section, the direct-current load management device also directly supplies power to the load; when the power supply in the electricity utilization parallel section (namely in the time period with moderate electricity price) charges the energy storage control circuit through the peak section power supply circuit, the power supply also directly supplies power to the load, and when the power supply in the electricity utilization parallel section only directly supplies power to the load; and enabling the energy storage control circuit to supply power to the load in the electricity utilization peak period (namely the period of highest electricity price). The direct current load management device is used for controlling the power supply circuit, the power supply is used for charging the energy storage device control circuit in the low-ebb section and directly supplying power to the load in the high-ebb section by means of the time interval range of tidal electricity price, and the energy storage device control circuit is used for supplying power to the load in the high-ebb section, so that the power efficiency is improved, the operation cost of communication is effectively reduced, and the low-carbon energy-saving environment-friendly concept is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a circuit diagram of a dc load management device according to an embodiment of the present invention;
FIG. 2 is a first detailed circuit diagram of the DC load management device according to the embodiment of the present invention;
fig. 3 is a detailed circuit diagram of a dc load management device in an embodiment of the invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprising" and "having," and any variations thereof, as referred to in embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Communication plays a significant role in national economy, the country requires communication speed to be increased, consumers require fee reduction, and operators feel unconscious due to the continuous increase of operation cost.
Therefore, the prior art has the technical problem of high operation cost of communication.
To solve the above problems, the present invention provides a dc load management device.
As shown in fig. 1, a dc load management apparatus according to an embodiment of the present invention includes a power access point, an energy storage control circuit, a high peak power supply circuit, and a low valley power supply circuit; the power supply access point is connected with the load through the peak section power supply circuit and the valley section power supply circuit respectively; the power supply access point is connected with the power supply input end of the energy storage device control circuit through the peak section power supply circuit and the valley section power supply circuit respectively; and the power supply output end of the energy storage control circuit is connected with a load.
By adopting the direct-current load management device provided by the embodiment of the invention, when a power supply at a power consumption valley section (namely a time period with lowest electricity price) charges the energy storage device through the power supply circuit at the valley section, the direct-current load management device also directly supplies power to the load; when the power supply in the electricity utilization parallel section (namely in the time period with moderate electricity price) charges the energy storage device through the peak section power supply circuit, the load is also directly supplied with power, and the load can also be directly supplied with power only in the electricity utilization parallel section; and the energy storage device is enabled to supply power to the load in the electricity utilization peak period (namely the period of highest electricity price). The direct current load management device is used for controlling the power supply circuit, the power supply is used for charging the energy accumulator and directly supplying power to the load in the valley section by means of the time interval range of tidal power price, and the energy accumulator is used for supplying power to the load in the peak section, so that the power efficiency is improved, the operation cost of communication is effectively reduced, and the low-carbon energy-saving environment-friendly concept is met.
In one possible embodiment, as shown in fig. 2, the high peak period power supply circuit includes a first time control module, a first relay, a first switching power supply, and a second switching power supply; the first time control module is connected with the control end of the first relay; one end of the first relay is connected with the power supply access point, and the other end of the first relay is respectively connected with the load and the power supply input end of the energy accumulator control circuit; the first switching power supply is positioned between the first relay and the load; the second switching power supply is positioned between the first relay and the power supply input end of the energy storage control circuit. First time control module is used for controlling the power supply to charge and carry out direct power supply to load at parallel section internal control energy storage ware control circuit, and the time of first time module can correspond the setting according to the concrete time with the level period, also can carry out the setting of corresponding time according to the required demand of charging of energy storage ware on the basis with level 1 section, for example: the first time control module is started for 15:00-18:00 and 21:00-23:00, the first time control module sends a control signal to the first relay to enable the first relay to be conducted, the power access point supplies power to the load and charges the energy storage control circuit through the first relay respectively, and the first switching power supply and the second switching power supply control the power supply to supply power to the load and charge the energy storage control circuit respectively. The utilization sets up first time control module, first relay, first switching power supply and second switching power supply, utilizes the power to carry out the energy storage for the energy storage when the load supplies power in the moderate period of price of electricity, according to morning and evening tides price of electricity rational distribution power supply mode to reduce the power cost.
In one possible embodiment, the dc load management device further comprises a diagnostic circuit; the diagnostic circuit comprises a diagnostic module and a second relay; one end of the diagnosis module is connected with the energy storage device control circuit, and the other end of the diagnosis module is connected with the control end of the second relay; the second relay is connected in parallel with the first relay. Set up diagnosis module and second relay, utilize the diagnosis module to detect the energy storage in the power consumption peak section, low (when the electric quantity is not enough promptly), the diagnosis module sends control signal to the second relay and makes the second relay switch on when voltage, and then the power is the load power supply respectively through the second relay to charge the energy storage, when preventing that the energy storage electric quantity is not enough, cause the load outage.
In one possible embodiment, the energy storage control circuit comprises an energy storage and a third relay; the first control end of the third relay is connected with the first time control module, and the second control end of the third relay is connected with the second time control module; the first path of the third relay is connected between the second switching power supply and the power input end of the energy accumulator, the second path of the third relay is connected between the power output end of the energy accumulator and a load, and the third path of the third relay is connected between the power output end of the power supply circuit at the valley section and the power input end of the energy accumulator. The first time control module is used for controlling a first passage and a second passage of the third relay, the second time control module is used for controlling the third passage of the third relay, when the first passage is conducted, the power supply charges the energy storage device through the peak section power supply circuit, when the second passage is conducted, the energy storage device supplies power to the load, and when the third passage is conducted, the power supply charges the energy storage device through the low valley section power supply circuit.
In one possible embodiment, the energy storage control circuit further comprises a delay module; and the first control end of the third relay is connected with the first time control module through the delay module. When the in-process of being supplied power to the load by the power supply conversion of energy storage to load has the time delay of several seconds, with setting up the time delay module, can make the energy storage extension to the power supply time of load in the power supply conversion to the load, when the energy storage stops the power supply, the power can replace the energy storage just and supply power to the load, prevents to produce the circumstances of load outage in the power supply conversion, has promoted the stability of supplying power.
In one possible embodiment, the valley section power supply circuit includes a second time control module and a fourth relay; the second time control module is connected with the control end of the fourth relay; one end of the fourth relay is connected with the power supply access point, and the other end of the fourth relay is respectively connected with the power supply input end of the energy storage device control circuit and the load. The second time control module is used for controlling the power supply to charge the energy storage control circuit in the valley section and directly supplying power to the load, the time of the second time module can be correspondingly set according to the specific time of the level 1 row section, and the common power utilization valley section is positioned at night. For example: the opening time of the second time control module is 23: 00-07: 00 of the next day, the second time control module sends a control signal to the fourth relay to enable the fourth relay to be conducted, and the power access point supplies power to the load and charges the energy storage control circuit through the fourth relay. The energy storage device is stored by the second time control module and the fourth relay, the power supply is used for supplying power to the load in the time period with the lowest electricity price, and the power supply mode is reasonably distributed according to the tidal electricity price, so that the electricity utilization cost is reduced.
For example: the national power grid implements tide electricity price (grade elevator electricity price, off-peak electricity price) for users, and the electricity price is divided into four stages as follows for general industrial and commercial enterprises:
the time is divided into four periods:
the peak periods cover the peak periods over the time period, which is the month of august every year. Energy can be stored only in the valley period and energy can be released in the peak period, so that consumption reduction, efficiency improvement and operation cost reduction can be realized. The optimal time period for reducing the electricity consumption cost is a high peak time period, the cost reduction amplitude of the parallel section is small, but the parallel section can also be used in the parallel section (namely the parallel section releases energy of the energy storage device) under the condition of surplus electricity. The cost reduction factor is determined by the magnitude of the load power and the energy storage capacity of the energy storage device, and the electric quantity stored by the energy storage device is slightly larger than the load power for 8 hours, so that the cost reduction can be maximized. Through simulation experiments: the DC48V200AH energy storage device can work for 10 hours under 1200W load, the electricity consumption is 12 degrees, and the cost can be reduced by 12 yuan RMB. If the load is a direct current load of 3000W, the energy is released for 8 hours in a high peak period, the electricity is used for 24 degrees, and the cost is reduced by 24 yuan RMB. The cost is reduced by 24 yuan a day and 8760 yuan a year. And the life cycle of general base station, computer lab lead acid battery is 5 to 6 years, and a set of 48V200AH battery worth is about 15000 yuan, because base station, computer lab lead acid battery (being the accumulator) is extremely low as stand-by power supply frequency of use, and the number of times of charging and discharging is also very little, this has just caused the loss of lead acid battery life, and adoption this scheme can promote lead acid battery's frequency of use by a wide margin, and life can prolong to original one time, is about 10 years. The cost of 30000 yuan of battery needs to be paid in 10 years in the original operation mode, and after the scheme is adopted, about 15000 yuan needs to be paid in 10 years, so that the cost of battery is saved by about 1500 yuan every year. In addition, the cost of electricity charge of the base station is reduced by 8760 yuan one year, the cost of a battery is reduced by 1500 yuan, and the cost is reduced by 10260 yuan.
In one possible embodiment, as shown in fig. 3, a metering module and a safety device are disposed between the power access point and the peak power supply circuit or the valley power supply circuit. The metering module is used for metering electric quantity, and the safety equipment is used for improving the power supply safety of the direct current load management device.
In one possible embodiment, a metering module and a safety device are arranged between the power supply access point and the diagnostic circuit. The metering module is used for metering electric quantity, and the safety equipment is used for improving the power supply safety of the direct current load management device.
In one possible embodiment, the safety device comprises a lightning protection module, an overvoltage, undervoltage and overcurrent protector and an air switch. The lightning protection module, the overvoltage/undervoltage/overcurrent protector and the air switch are arranged, and when the direct current load management device has a safety problem, the circuit is correspondingly protected.
In one possible implementation, a switch group is arranged between the power supply access point and the peak section power supply circuit or the valley section power supply circuit. The switch group is used for controlling the on-off of each circuit in the direct current load management device.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The apparatus provided by the embodiment of the present invention may be specific hardware on the device, or software or firmware installed on the device, etc. The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments without reference to the device embodiments. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the foregoing systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; and the modifications, changes or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. Are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A direct current load management device is characterized by comprising a power supply access point, an energy storage control circuit, a high peak section power supply circuit and a low valley section power supply circuit;
the power supply access point is connected with a load through the peak section power supply circuit and the valley section power supply circuit respectively;
the power supply access point is connected with the power supply input end of the energy storage device control circuit through the peak section power supply circuit and the valley section power supply circuit respectively;
and the power output end of the energy storage control circuit is connected with a load.
2. The dc load management device according to claim 1, wherein the peak-to-peak power supply circuit comprises a first time control module, a first relay, a first switching power supply, and a second switching power supply;
the first time control module is connected with the control end of the first relay;
one end of the first relay is connected with the power supply access point, and the other end of the first relay is respectively connected with a load and a power supply input end of the energy accumulator control circuit;
the first switching power supply is positioned between the first relay and a load;
the second switching power supply is positioned between the first relay and the power supply input end of the energy storage control circuit.
3. The dc load management device of claim 2, further comprising a diagnostic circuit;
the diagnostic circuit comprises a diagnostic module and a second relay;
one end of the diagnosis module is connected with the energy storage device control circuit, and the other end of the diagnosis module is connected with the control end of the second relay;
the second relay is connected in parallel with the first relay.
4. The dc load management device of claim 2, wherein the energy storage control circuit comprises an energy storage and a third relay;
the first control end of the third relay is connected with the first time control module, and the second control end of the third relay is connected with the second time control module;
the first path of the third relay is connected between the second switching power supply and the power input end of the energy accumulator, the second path of the third relay is connected between the power output end of the energy accumulator and the load, and the third path of the third relay is connected between the power output end of the low valley section power supply circuit and the power input end of the energy accumulator.
5. The dc load management device of claim 4, wherein the energy storage control circuit further comprises a delay module;
and the first control end of the third relay is connected with the first time control module through a delay module.
6. The dc load management device of claim 1, wherein the valley section power supply circuit comprises a second time control module and a fourth relay;
the second time control module is connected with the control end of the fourth relay;
one end of the fourth relay is connected with the power supply access point, and the other end of the fourth relay is respectively connected with the power supply input end of the energy storage control circuit and the load.
7. The dc load management device according to claim 1, wherein a metering module and a safety device are disposed between the power access point and the peak power supply circuit or the valley power supply circuit.
8. The dc load management device according to claim 3, wherein a metering module and a safety device are disposed between the power access point and the diagnostic circuit.
9. The dc load management device according to claim 7 or 8, wherein the safety equipment comprises a lightning protection module, an under-voltage and over-current protector and an air switch.
10. The dc load management device according to claim 1, wherein a switch group is disposed between the power access point and the peak power supply circuit or the valley power supply circuit.
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| CN202111124051.1A CN114039341A (en) | 2021-09-24 | 2021-09-24 | Direct current load management device |
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| CN202111124051.1A CN114039341A (en) | 2021-09-24 | 2021-09-24 | Direct current load management device |
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| EP2290387A2 (en) * | 2009-08-31 | 2011-03-02 | Kabushiki Kaisha Toshiba | Apparatus and method for establishing battery value index |
| CN103633737A (en) * | 2013-11-15 | 2014-03-12 | 广东电网公司佛山供电局 | Residential electricity consumption load power supply device |
| CN203933038U (en) * | 2014-01-13 | 2014-11-05 | 山东大学 | From the grid-connected mixing photovoltaic power generation control system of net |
| CN106684995A (en) * | 2017-01-04 | 2017-05-17 | 北京百度网讯科技有限公司 | Power supply system and control method |
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2021
- 2021-09-24 CN CN202111124051.1A patent/CN114039341A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6590793B1 (en) * | 1996-08-23 | 2003-07-08 | Canon Kabushiki Kaisha | Electric power supplying apparatus using unstable electric power supply and control method therefor |
| JP2002017042A (en) * | 2000-06-28 | 2002-01-18 | Sanyo Electric Co Ltd | Method of controlling power route |
| EP2290387A2 (en) * | 2009-08-31 | 2011-03-02 | Kabushiki Kaisha Toshiba | Apparatus and method for establishing battery value index |
| CN103633737A (en) * | 2013-11-15 | 2014-03-12 | 广东电网公司佛山供电局 | Residential electricity consumption load power supply device |
| CN203933038U (en) * | 2014-01-13 | 2014-11-05 | 山东大学 | From the grid-connected mixing photovoltaic power generation control system of net |
| CN106684995A (en) * | 2017-01-04 | 2017-05-17 | 北京百度网讯科技有限公司 | Power supply system and control method |
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