CN110445253B - Mainboard power supply system and method for intelligently switching power supplies - Google Patents
Mainboard power supply system and method for intelligently switching power supplies Download PDFInfo
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- CN110445253B CN110445253B CN201910736386.5A CN201910736386A CN110445253B CN 110445253 B CN110445253 B CN 110445253B CN 201910736386 A CN201910736386 A CN 201910736386A CN 110445253 B CN110445253 B CN 110445253B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000003507 refrigerant Substances 0.000 claims abstract description 54
- 238000004378 air conditioning Methods 0.000 claims abstract description 31
- 238000004804 winding Methods 0.000 claims abstract description 23
- 230000006698 induction Effects 0.000 claims abstract description 16
- 230000002159 abnormal effect Effects 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
- 239000010725 compressor oil Substances 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/37—Resuming operation, e.g. after power outages; Emergency starting
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a mainboard power supply system and method for intelligently switching power supplies; wherein, this system includes: a power supply device and a main board; the mainboard is used for switching the power supply circuit to connect the mainboard with the power supply device under the condition that the external power supply for supplying power to the mainboard is detected to be abnormal; the power supply device is arranged on a refrigerant pipe of the multi-connected air conditioning unit and used for generating electric energy to supply power to the main board; the electric energy generated by the power supply device is generated by the fact that the flow of the refrigerant in the refrigerant pipe drives the magnetic structure in the power supply device to rotate so that the winding in the power supply device performs cutting magnetic induction line movement. According to the invention, the problem of power failure of the internal machine mainboard when the multi-connected air conditioning unit is used in the related technology is solved, and the effects of enhancing the running stability of the multi-connected air conditioning unit and improving the user experience are achieved.
Description
Technical Field
The invention relates to the field of household appliances, in particular to a mainboard power supply system and method for intelligently switching power supplies.
Background
Because the multi-connected air conditioning unit combines the advantages of comfort of a central air conditioner, high grade, convenient and flexible installation of a split air conditioner and the like, the multi-connected air conditioning unit is widely applied to various places, such as modern household spaces, commercial places, office environments and the like with different scales and different purposes.
At present, the inner machine and the outer machine of the multi-connected air conditioning unit are powered by different power supplies, in a plurality of use places, each inner machine of the multi-connected air conditioning unit is powered by an independent indoor power supply, but some users may cut off the power supply of the inner machine when going out or not using the air conditioner. Once the multi-connected air conditioning unit is in a working state and the main board of part of the internal units is powered off, the electronic expansion valve of the powered-off internal unit cannot be powered on normally, so that the problems of liquid return of the compressor, poor system refrigeration/heating effect, power-off internal unit condensation, water leakage, incapability of recovering compressor oil and the like easily occur.
In the related technology, once part of the internal machines in the whole multi-connected air conditioning unit are in a power failure state, the running stability of the multi-connected air conditioning unit can be influenced, and certain influences can be caused on the aspects of complete machine use, user experience, the service life of a movement mechanism and the like.
In view of the above problems in the related art, no effective solution exists at present.
Disclosure of Invention
The embodiment of the invention provides a mainboard power supply system and method for intelligently switching power supplies, which at least solve the problem that an internal machine mainboard is powered off when a multi-connected air conditioning unit is used in the related art.
According to an embodiment of the present invention, there is provided a motherboard power supply system for intelligently switching power supplies, including: a power supply device and a main board; the mainboard is used for switching the power supply circuit to connect the mainboard with the power supply device under the condition that the external power supply for supplying power to the mainboard is detected to be abnormal; the power supply device is arranged on a refrigerant pipe of the multi-connected air conditioning unit and used for generating electric energy to supply power to the main board; the electric energy generated by the power supply device is generated by the fact that the flow of the refrigerant in the refrigerant pipe drives the power supply device in the power supply device to rotate so that the winding in the magnetic structure performs cutting magnetic induction line motion.
Optionally, the power supply device comprises: a stator composed of windings and a rotor composed of magnetic rings and impellers; when the refrigerant in the refrigerant pipe flows, the rotor is driven to rotate so as to generate the change of a magnetic field, and the winding in the stator performs the motion of cutting the magnetic induction line so as to generate electric energy.
Optionally, the magnetic ring is fixedly connected with the impeller, the magnetic ring and the impeller are both positioned inside the refrigerant pipe, and the impeller is used for rotating under the pushing of the refrigerant in the refrigerant pipe and driving the magnetic ring to rotate; the winding is located the refrigerant pipe pipeline outside, encircles refrigerant pipe pipeline a week, and the winding is used for producing the magnetic field.
Optionally, the main board includes: the power supply switching circuit comprises a main control unit, a power supply switching circuit and a power supply detection circuit; the power supply detection circuit is used for detecting whether the external power supply is normal or not; and the main control unit is used for controlling whether the power supply switching circuit needs to switch the current power supply circuit according to the state of the external power supply.
Optionally, the main board includes: a rectifying circuit; and the rectifying circuit is used for converting the electric energy generated by the power supply device into stable voltage.
According to another embodiment of the present invention, a motherboard power supply method for intelligently switching power supplies is provided, the method including: the method comprises the following steps that when the mainboard detects that an external power supply for supplying power to the mainboard is abnormal, a power supply circuit is switched to enable the mainboard to be connected with a power supply device; the power supply device arranged on a refrigerant pipe of the multi-connected air conditioning unit generates electric energy to supply power to the main board; the electric energy generated by the power supply device is generated by the fact that the flow of the refrigerant in the refrigerant pipe drives the magnetic structure in the power supply device to rotate so that the winding in the power supply device performs cutting magnetic induction line movement.
Optionally, the method further comprises: under the condition that the external power supply is abnormal, the internal machine corresponding to the main board is controlled to enter a standby mode, and the electronic expansion valve of the internal machine is kept in a power-on working state, so that the opening of the electronic expansion valve is controlled by electric energy provided by the power supply device when the external power supply is not switched on.
Optionally, the power supply device comprises: a stator composed of windings and a rotor composed of magnetic rings and impellers; when the refrigerant in the refrigerant pipe flows, the rotor is driven to rotate so as to generate the change of a magnetic field, and the winding in the stator performs the motion of cutting the magnetic induction line so as to generate electric energy.
Optionally, the method further comprises: before the external power supply is abnormal and the power is supplied to the main board by the power supply device, the power generated by the power supply device is converted into a stable voltage through the rectifying circuit.
Optionally, the method further comprises: under the condition that the external power supply is normal, the mainboard cuts off the connection with the power supply device and switches to be supplied with power by the external power supply.
According to the invention, the power supply device is arranged on the refrigerant pipe of the multi-connected air conditioning unit, the power supply device drives the power supply device in the power supply device to rotate through the flow of the refrigerant in the refrigerant pipe, so that the winding in the magnetic structure performs cutting magnetic induction line motion to generate electric energy, and the power supply circuit is switched to connect the main board with the power supply device under the condition that the internal main board detects that an external power supply for supplying power to the internal main board is abnormal, so that the problem that the internal main board is powered off when the multi-connected air conditioning unit is used is solved, and the effects of enhancing the running stability of the multi-connected air conditioning unit and improving the user experience degree are achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a block diagram of a hardware configuration of a motherboard power supply system of an intelligent switching power supply according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the power supply device 100 in fig. 1;
FIG. 3 is a block diagram illustrating a detailed structure of a motherboard power supply system with an intelligent switching power supply according to an embodiment of the present invention;
fig. 4 is a flowchart of a motherboard power supply method of an intelligent switching power supply according to an embodiment of the invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
In the present embodiment, a motherboard power supply system for intelligently switching power supplies is provided, and as used below, the term "module" may implement a combination of software and/or hardware for a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Referring to fig. 1, fig. 1 is a block diagram of a hardware structure of a motherboard power supply system of an intelligent switching power supply according to an embodiment of the present invention. The mainboard power supply system comprises a power supply device 100 and a mainboard 101, wherein the mainboard 101 is used for switching a power supply circuit to connect the mainboard 101 with the power supply device 100 under the condition that the external power supply for supplying power to the mainboard 101 is detected to be abnormal; the power supply device 100 is arranged on a refrigerant pipe 102 of the multi-connected air conditioning unit and used for generating electric energy to supply power to the main board 101; the electric energy generated by the power supply device 100 is generated by the rotation of the power supply device in the power supply device driven by the flow of the refrigerant in the refrigerant pipe 102 so that the winding in the magnetic structure performs the motion of cutting the magnetic induction line.
It should be noted that, in order to ensure that the power supply device 100 can obtain the electric energy from the refrigerant flowing through the refrigerant pipe when the multi-connected air conditioning unit starts to operate, and the electric energy obtained in unit time is enough to supply power to the main board 101, the power supply device 100 may be disposed on a trunk line of the refrigerant pipe. It can be understood by those skilled in the art that the power supply device 100 may be disposed on any refrigerant pipe of the multi-connected air conditioning unit, and the above-mentioned disposing on the trunk line of the refrigerant pipe is a preferred embodiment, and when the disposing is implemented, other positions of the refrigerant pipe may be selected according to the wiring requirement and the refrigerant flow rate, and the like, and the present embodiment is not limited.
Further, referring to fig. 2, fig. 2 is a schematic structural diagram of the power supply apparatus 100 in fig. 1. The power supply device 100 includes a stator constituted by a winding 1001 and a rotor constituted by a magnetic ring 1002 and an impeller 1003; when the refrigerant in the refrigerant pipe flows, the rotor is driven to rotate to generate the change of the magnetic field, and the winding 1001 in the stator performs the motion of cutting the magnetic induction line to generate electric energy.
Further, referring to fig. 3, fig. 3 is a detailed structural block diagram of the motherboard power supply system of the intelligent switching power supply according to the embodiment of the invention. The main board 101 includes: a main control unit 1110, a power switching circuit 1111 and a power detection circuit 1112; a power supply detection circuit 1112 for detecting whether the external power supply is normal; the main control unit 1110 is configured to control whether the power switching circuit needs to switch the current power supply circuit according to a state of the external power supply.
The main board 101 detects whether an external power source such as an external commercial power is normal through the power detection circuit 1112, if the external power source is detected to be abnormal, the main control unit 1110 controls the power switching circuit 1111 to switch the current power supply circuit to the power supply device 100, and obtains electric energy from the power supply device 100 to supply power to the main control unit 1110; if the external power supply is detected to be normal, the main control unit 1110 controls the power switching circuit 1111 to switch the current power supply circuit to the external power supply, and obtains electric energy from the external power supply to supply power to the main control unit 1110.
Optionally, the main board 101 includes a rectifying circuit 1113; the rectifying circuit 1113 is configured to convert the electric energy generated by the power supply device into a stable voltage. The rectifier circuit 1113 is provided between the power supply device 100 and the power supply switching circuit 1111, converts electric energy obtained from the power supply device 100 into stable current and voltage, and supplies the stable current and voltage to a load such as an electronic expansion valve via the power supply switching circuit 1111.
Through the mainboard power supply system in this embodiment, realize detecting under the unusual condition of external power supply to the mainboard power supply at the mainboard, can automatic switch-over power supply circuit so that the mainboard is connected with power supply unit, thereby make the interior machine mainboard that originally falls the power failure acquire the electric energy in can following power supply unit, the electronic expansion valve who has guaranteed the interior machine can normally go up the electric work, avoided appearing the compressor and returned the liquid, system refrigeration/heating effect is poor, fall the condensation of power failure interior machine, leak and the unable scheduling problem that retrieves of compressor oil, thereby the effect that the stability of reinforcing air conditioning unit operation that ally oneself with and improvement user experience degree has been reached.
Example 2
In this embodiment, a motherboard power supply method of an intelligent switching power supply operating in the above apparatus is provided, and fig. 4 is a flowchart of the motherboard power supply method of the intelligent switching power supply according to the embodiment of the present invention, as shown in fig. 4, the flowchart includes the following steps:
step S300, when the mainboard detects that an external power supply for supplying power to the mainboard is abnormal, the power supply circuit is switched to connect the mainboard with the power supply device;
step S301, a power supply device arranged on a refrigerant pipe of the multi-connected air conditioning unit generates electric energy to supply power to a main board; the electric energy generated by the power supply device is generated by the fact that the flow of the refrigerant in the refrigerant pipe drives the power supply device in the power supply device to rotate so that the winding in the magnetic structure performs cutting magnetic induction line motion.
Through above-mentioned step S300 to step S301, set up a power supply unit on the refrigerant pipe of the air conditioning unit that ally oneself with, power supply unit is through the refrigerant flow in the refrigerant pipe drive the magnetic structure among the power supply unit and do the motion of cutting magnetic induction line and produce the electric energy, under the unusual circumstances of external power source that the interior mainboard detected to its power supply, switch power supply circuit so that the mainboard is connected with power supply unit, thereby the problem that the interior mainboard falls down when having solved the air conditioning unit that ally oneself with and using, the effect that the stability of the air conditioning unit operation that has strengthened ally oneself with and improve user experience degree has been reached.
Further, based on the above step S300 and step S301, the method of this embodiment may further include:
step S302, under the condition that the external power supply is abnormal, controlling an internal machine corresponding to the mainboard to enter a standby mode, and keeping an electronic expansion valve of the internal machine in a power-on working state, so that the internal machine controls the opening degree of the electronic expansion valve through electric energy provided by a power supply device when the external power supply is not switched on.
That is to say, even if the internal machine mainboard is without the circumstances of external power supply, still accessible power supply unit supplies power to the mainboard to guarantee that the electronic expansion valve of internal machine is in circular telegram operating condition. However, at this time, the main board is not in a normal working state as when an external power supply is connected, so that the main board is in a standby state, and the main board in the standby state is in a power-down state except that the communication module and the electronic expansion valve are powered on, so that the problems of liquid return of the compressor, poor system refrigeration/heating effect, condensation and water leakage of the power-down internal unit, incapability of recovering compressor oil and the like caused by the fact that the electronic expansion valve of the internal unit is in the power-down state when the multi-connected air conditioning unit works are solved.
In a manner of this embodiment, the method of this embodiment further includes:
step S303, when the refrigerant in the refrigerant pipe flows, the rotor is driven to rotate so as to generate the change of the magnetic field, and the winding in the stator performs the motion of cutting the magnetic induction line so as to generate electric energy.
Based on the above-described power generation device in fig. 2, the power generation device includes a stator composed of windings and a rotor composed of magnetic rings and impellers. When the impeller rotates under the push of the refrigerant in the refrigerant pipe, the magnetic ring is synchronously driven to rotate, so that the winding in the stator performs cutting magnetic induction line motion to generate electric energy. The embodiment converts the kinetic energy of the refrigerant in the multi-connected air conditioning unit into the electric energy by using the power generation device, thereby achieving the effects of reasonably utilizing resources and saving resources.
In a manner of this embodiment, the method of this embodiment further includes:
in step S304, before the external power source is abnormal and the power supply device supplies power to the main board, the power generated by the power supply device is converted into a stable voltage by the rectifier circuit.
Based on the rectified current in fig. 3, the rectifying circuit is disposed between the power supply device and the power switching circuit, and is configured to convert the electric energy obtained from the power supply device into a power source with stable current and voltage, and output the power source to loads such as an electronic expansion valve through the power switching circuit. The rectifying circuit in this embodiment rectifies and stabilizes the voltage of the unstable electric energy generated by the power generation device, thereby playing a role in protecting the load.
In a manner of this embodiment, the method of this embodiment further includes:
in step S305, when the external power supply is normal, the main board disconnects the power supply device and switches to the external power supply.
Under the condition that the power supply detection circuit on the mainboard detects that the external power supply supplying power to the mainboard is normal, the power supply switching circuit on the mainboard cuts off the connection with the power supply device, switches the power supply circuit of the mainboard to the external power supply and supplies power through the external power supply. It should be noted that the external power supply may be a dc power supply provided by a mains supply access terminal or other functional modules, which is not limited in this embodiment. In this embodiment, under the condition that has external power source normal power supply, the external power source power supply of preferential adoption, only under the condition that external power source can not normally supply power, just use power generation facility's electric energy as power supply, guaranteed like this that the internal unit mainboard can normally work under the condition of connecting external power source, under the condition of connecting power generation facility, can avoid the compressor to return the liquid, fall the internal unit condensation of electricity, leak and the unable problem of retrieving of compressor oil.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a power supply system of many air conditioning unit mainboards that ally oneself with which includes: a power supply device and a main board;
the mainboard is used for switching a power supply circuit to connect the mainboard with the power supply device under the condition that the external power supply for supplying power to the mainboard is detected to be abnormal;
the power supply device is arranged on a refrigerant pipe of the multi-connected air conditioning unit and used for generating electric energy to supply power to the main board; the electric energy generated by the power supply device is generated by the fact that the flowing of the refrigerant in the refrigerant pipe drives the magnetic structure in the power supply device to rotate so that the winding in the power supply device performs cutting magnetic induction line movement; the power supply device includes: a stator and a rotor; when the refrigerant in the refrigerant pipe flows, the rotor is driven to rotate so as to generate the change of a magnetic field, and the winding in the stator performs the motion of cutting the magnetic induction line so as to generate electric energy.
2. The power supply system of claim 1 wherein said stator is comprised of windings and said rotor is comprised of magnetic rings and impellers.
3. The power supply system of claim 1, wherein the motherboard comprises: the power supply switching circuit comprises a main control unit, a power supply switching circuit and a power supply detection circuit;
the power supply detection circuit is used for detecting whether the external power supply is normal or not;
and the main control unit is used for controlling the power supply switching circuit to switch the current power supply circuit according to the state of the external power supply.
4. The power supply system of claim 1, wherein the motherboard comprises: a rectifying circuit;
the rectifying circuit is used for converting the electric energy generated by the power supply device into stable voltage.
5. A method for a power supply system based on a multi-connected air conditioning unit mainboard is characterized in that the power supply system of the multi-connected air conditioning unit mainboard comprises the following steps; power supply unit and mainboard, the method includes:
the mainboard switches a power supply circuit to connect the mainboard with the power supply device when detecting that an external power supply for supplying power to the mainboard is abnormal;
the power supply device is arranged on a refrigerant pipe of the multi-connected air conditioning unit and generates electric energy to supply power to the mainboard; the electric energy generated by the power supply device is generated by the fact that the flowing of the refrigerant in the refrigerant pipe drives the magnetic structure in the power supply device to rotate so that the winding in the power supply device performs cutting magnetic induction line movement; the power supply device includes: a stator composed of windings and a rotor composed of magnetic rings and impellers; when the refrigerant in the refrigerant pipe flows, the rotor is driven to rotate so as to generate the change of a magnetic field, and the winding in the stator performs the motion of cutting the magnetic induction line so as to generate electric energy.
6. The method of claim 5, further comprising:
and under the condition that the external power supply is abnormal, controlling an internal machine corresponding to the mainboard to enter a standby mode, and keeping an electronic expansion valve of the internal machine in a power-on working state, so that the opening of the electronic expansion valve is controlled by electric energy provided by the power supply device when the external power supply is not switched on by the internal machine.
7. The method of claim 5, further comprising:
and converting the electric energy generated by the power supply device into stable voltage through a rectifying circuit before the external power supply is abnormal and the power supply device supplies the electric energy to the mainboard.
8. The method of claim 5, further comprising:
and under the condition that the external power supply is normal, the mainboard cuts off the connection with the power supply device and switches to the power supply from the external power supply.
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