CN105576643A - Load current balancing method and device - Google Patents
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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
- H02J1/10—Parallel operation of DC sources
- H02J1/102—Parallel operation of DC sources being switching converters
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Abstract
The embodiment of the invention discloses a load current balancing method. The load current balancing method comprises the following steps of sampling a first output current of a first power supply when the first power supply and a second power supply are simultaneously accessed to a load current balancing bus, wherein the powers of the first power supply and the second power supply are different; and adjusting the first output current of the first power supply based on the first output current and a preset load current balancing strategy so that the first output current is consistent with a second output current of the second power supply. The embodiment of the invention simultaneously discloses a load current balancing device.
Description
Technical Field
The invention relates to the field of power management, in particular to a load current sharing method and device.
Background
With the continuous development of science and technology, electronic technology has also gained rapid development, and the variety of electronic products is also more and more, and people also enjoy various conveniences brought by the development of science and technology. People can enjoy comfortable life brought along with the development of science and technology through various types of electronic equipment.
At present, in order to improve the safety and reliability of a system, two different power supplies are arranged in the same system, and the powers of the two power supplies can be different, but in the same system, because of the constraint of a load current-sharing circuit signal, the power supplies with different powers can not be matched, so that the two power supplies can not distribute current evenly or distribute current in proportion, that is, the two power supplies can not work simultaneously, the redundancy characteristic of a redundant power supply is lost, and the waste of resources is caused.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide a method and an apparatus for load current sharing, so as to implement simultaneous operations of power supplies with different powers, fully utilize system resources, and provide good user experience.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a load sharing method, including: when the first power supply and the second power supply are simultaneously connected to a load current-sharing bus, sampling a first output current of the first power supply, wherein the first power supply and the second power supply have different powers; and adjusting the first output current of the first power supply based on the first output current and a preset load current sharing strategy, so that the first output current is consistent with the second output current of the second power supply.
In a second aspect, an embodiment of the present invention also provides a device for load balancing, where the device includes: the power source comprises a first power source, a second power source and a load current sharing bus, wherein the first power source and the second power source have different powers; the first power supply is used for sampling a first output current of the first power supply when the first power supply and the second power supply are simultaneously connected to the load current sharing bus, and adjusting the first output current of the first power supply based on the first output current and a preset load current sharing strategy to enable the first output current to be consistent with a second output current of the second power supply.
In the method and the device for load current sharing provided by the embodiment of the invention, when a first power supply and a second power supply with different powers are simultaneously connected to a load current sharing bus, a first output current of the first power supply is sampled, and then the first output current of the first power supply is adjusted based on the first output current and a preset load current sharing strategy, so that the first output current is consistent with a second output current of the second power supply, thus, the power supplies with different powers can work simultaneously, the compatibility among power supply modules with different powers is increased, system resources are fully utilized, and good user experience is provided.
Drawings
Fig. 1 is a schematic structural diagram of a load current sharing device according to one embodiment to three embodiments of the present invention;
FIG. 2 is a flow chart illustrating a method for load balancing according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for compensating an output voltage according to a first embodiment of the present invention;
FIG. 4 is a flowchart illustrating a load balancing method according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of another exemplary load sharing device according to a third embodiment of the present invention;
fig. 6 is a schematic structural diagram of a load sharing apparatus according to a third embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a load current sharing method, which is applied to a load current sharing device, and the device can be arranged in a power module of electronic equipment to supply power to the electronic equipment. The electronic device can be a server, a switch, a local area network bus, a large-size tablet computer, a smart phone and the like.
Referring to fig. 1, the load share device includes: the power supply system comprises a first Power Supply Unit (PSU) 1 and a second PSU2, wherein the first PSU1 and the second PSU2 are simultaneously connected to a load current-sharing bus (LoadSharingBus)3, the load current-sharing device comprises a first PSU1, a second PSU2 and the load current-sharing bus 3, wherein the first PSU1 and the second PSU2 have different powers when being fully loaded, the first PSU1 and the second PSU2 are respectively connected to the load current-sharing bus 3 through a first diode 41 and a second diode 42, when a first voltage output from the first PSU1 to the load current-sharing bus 3 is smaller than a second voltage output from the second PSU2 to the load current-sharing bus 3, the diode 42 connected to the second PSU2 is turned on, and on the contrary, the diode 41 connected to the first PSU1 is turned on.
The method for load balancing provided in this embodiment is described below with reference to the load balancing apparatus.
Referring to fig. 2, the method includes:
s201: when the first PSU and the second PSU are simultaneously connected to the load current-sharing bus, sampling a first output current of the first PSU;
specifically, when the first PSU and the second PSU are simultaneously connected to the load current sharing bus, firstly, the input voltage of the first PSU is subjected to voltage conversion, the input voltage is adjusted to be the output voltage meeting the specification, then, the first output current is obtained, and then, the first output current is sampled.
It should be noted that, in this embodiment, the first output current may be directly measured by sampling the first current, or the voltage value of the resistor may be measured, for example, a resistor is disposed on the output trunk of the first PSU, and the voltage of the resistor, that is, the first sampling voltage, is collected, and the first sampling voltage is used to represent the first current.
In another embodiment, in order to ensure the stability of the output voltage of the first PSU and to ensure the consistency of the output voltages of the modules in the first PSU, the first output voltage of the first PSU may be compensated before the step of sampling the first output current of the first PSU, and then, referring to fig. 3, the method further includes:
s301: performing voltage conversion on the input voltage of the first PSU to obtain a first output voltage;
s302: sampling the first output voltage to obtain a voltage sampling value;
s303: comparing the voltage sampling value with a voltage expected value of the first output voltage;
s304: when the voltage sample value is different from the voltage expected value, the first output voltage is adjusted based on the difference between the voltage sample value and the voltage expected value.
Specifically, in the foregoing S301 to S304, when the first PSU and the second PSU are simultaneously connected to the load share bus, the input voltage of the first PSU is subjected to voltage conversion to obtain a first output voltage, then the first output voltage is sampled, and if a sampling value of the first output voltage, that is, the voltage sampling value is different from an expected first output voltage, that is, an expected voltage value, the first output voltage is adjusted based on a difference between the voltage sampling value and the expected voltage value, and at this time, the first output voltage is only in compliance with the specification.
The desired value of the first output voltage is set in advance.
S202: and adjusting the first output current of the first PSU based on the first output current and a preset load current sharing strategy to enable the first output current to be consistent with the second output current of the second PSU.
In a specific implementation, when sampling the first input current is performed by setting a resistor on the output trunk of the first PSU, S202 may include: amplifying a first sampling voltage used for representing the first output current according to a preset load current sharing strategy to obtain a first voltage; and if the first voltage is smaller than a second voltage, adjusting the first output current based on a difference value between the first voltage and the second voltage, wherein the second voltage is the voltage of the second PSU on the load current sharing bus.
Specifically, after a first sampling voltage is obtained by sampling a first input current in a manner of arranging a resistor on an output trunk of the first PSU, the first sampling voltage is amplified according to a preset load current sharing strategy, and an amplified voltage, that is, the first voltage is obtained. For example, the preset load current sharing strategy may be as shown in table 1 below, and since the first sampling voltage represents the first output current, the first list item in table 1 is the first output current value; of course, the first sampling voltage value may also be directly used as the first list item, and at this time, the preset load current sharing strategy may be as shown in table 2 below, where the first sampling voltage in table 2 is a voltage of a resistor with a value of 0.1 Ω. Of course, in practical applications, the resistance may also be other values, and at this time, the first sampling voltage value also changes correspondingly, and the present invention is not limited in particular.
TABLE 1
TABLE 2
Here, table 1 and table 2 are only described by taking the first PSU as 500W when fully loaded and the second PSU as 1000W when fully loaded, but in practical applications, the power of the first PSU and the second PSU when fully loaded may be other values, and those skilled in the art may set the values in table 1 and table 2 according to practical situations, and the present invention is not limited specifically.
Then, after obtaining the first voltage, the voltage is output to the load current sharing bus, and at the same time, the second PSU also outputs the second voltage to the load current sharing bus, so that when the first voltage is smaller than the second voltage, a diode connected to the second PSU is turned on, the second voltage is input to the first PSU, and then the first PSU adjusts the first output current based on a difference between the first voltage and the second voltage, such as Pulse Width Modulation (PWM) change or frequency change, to increase the first output current, so that the first output current is consistent with the second output current of the second PSU, thus, load current sharing is achieved.
It should be noted that, in practical applications, when the difference between the first output current and the second output current is not large, the first output current can be adjusted once to be consistent with the second output current, and if the difference between the first output current and the second output current is large, multiple adjustments are required to be performed to make the first output current consistent with the second output current, which is not limited in the present invention.
In the embodiment of the invention, when a first PSU and a second PSU with different powers are simultaneously connected to a load current-sharing bus, a first output current of the first PSU is sampled, and then the first output current of the first PSU is regulated based on the first output current and a preset load current-sharing strategy, so that the first output current is consistent with a second output current of the second PSU, thus realizing the simultaneous working of power supplies with different powers, increasing the compatibility among power supply modules with different frequencies, fully utilizing system resources and providing good user experience.
Example two:
on the basis of the first embodiment, in order to achieve fast load balancing and improve timeliness, in addition to the first output current of the first PSU being adjusted, the second output current of the second PSU may be adjusted, and then, as described with reference to fig. 4, the method further includes:
s401: when the first PSU and the second PSU are simultaneously connected to the load current-sharing bus, sampling a second output current of the second PSU;
s402: and adjusting the second output current of the second PSU based on the second output current and a preset load current sharing strategy to enable the second output current to be consistent with the first output current.
In this embodiment, the adjustment of the second PSU is consistent with the adjustment of the first PSU in the first embodiment, and details are not repeated here.
The method for load balancing in this embodiment is described below with specific examples.
In conjunction with fig. 1 and 2, assume that the first PSU1 has a power of 500W at full load and the second PSU2 has a power of 1000W at full load.
Then, when the electronic device issues a power on command according to the user's operation after the first PSU1 and the second PSU2 are plugged into the power lines at the same time, at this time, the first PSU1 and the second PSU2 are powered on at the same time and output the same output voltage;
secondly, the first PSU1 and the second PSU2 sample the first output current and the second output current respectively to obtain a first sampling voltage for representing the first output current and a second sampling voltage for representing the second output current;
thirdly, the first PSU1 amplifies the first sampled voltage according to a preset load current sharing strategy to obtain a first voltage, and meanwhile, the second PSU2 amplifies the second sampled voltage according to the preset load current sharing strategy to obtain a second voltage;
fourthly, the first PSU1 and the second PSU2 output the first voltage and the second voltage to the load balancing bus, respectively;
then, when the first voltage is less than the second voltage, the first PSU1 adjusts the first output current based on the difference between the first voltage and the second voltage such that the first output current is consistent with the second output current;
when the first voltage is greater than the second voltage, the second PSU2 adjusts the second output current based on a difference between the first voltage and the second voltage such that the first output current is consistent with the second output current;
when the first voltage is equal to the second voltage, the actual output power of the first PSU1 is consistent with that of the second PSU2, and at the moment, the first output current is consistent with that of the second output current, so that load current sharing is achieved without any regulation.
In this embodiment, when a first PSU and a second PSU with different powers are simultaneously connected to a load current sharing bus, the first PSU and the second PSU respectively sample a first output current and a second output current, and then, based on the first output current and/or the second output current and a preset load current sharing policy, the first output current of the first PSU and/or the second output current of the second PSU are/is adjusted, so that the first output current of the first PSU is consistent with the second output current of the second PSU.
Example three:
based on the same inventive concept, the present embodiment provides a load balancing apparatus, which is the same as the load balancing apparatus described in one or more embodiments above.
Still referring to fig. 1, the apparatus includes: a first PSU1, a second PSU2, and a load share bus 3, the first PSU1 and the second PSU2 having different power; the first PSU1 is configured to sample a first output current of the first PSU1 when the first PSU2 and the second PSU2 are simultaneously connected to the load current sharing bus 3, and adjust the first output current of the first PSU1 based on the first output current and a preset load current sharing policy, so that the first output current is consistent with a second output current of the second PSU 2.
In the above scenario, referring to fig. 5, the first PSU1 includes: a first current detection unit 51, configured to sample a first output current of the first PSU1 when the first PSU1 and the second PSU2 are simultaneously connected to the load share bus; the first current adjusting unit 52 is configured to adjust the first output current of the first PSU1 based on the first output current and a preset load sharing strategy, so that the first output current is consistent with the second output current of the second PSU 2.
In the above scheme, the first current adjusting unit 52 includes: the proportion amplification subunit is used for amplifying a first sampling voltage used for representing the first output current according to a preset load current sharing strategy to obtain a corresponding first voltage; the load current sharing subunit is used for calculating the difference value between the first voltage and the second voltage when the first voltage is smaller than the second voltage, wherein the second voltage is the voltage of the second PSU2 on the load current sharing bus 3; and the feedback subunit is used for adjusting the first output current based on the difference value of the first voltage and the second voltage.
In the foregoing solution, the first PSU1 further includes: a voltage conversion unit, configured to perform voltage conversion on an input voltage of the first PSU1 before sampling the first output current, to obtain a first output voltage;
the voltage detection unit is used for sampling the first output voltage to obtain a voltage sampling value;
correspondingly, the feedback subunit is further configured to compare the voltage sampling value with a voltage expected value of the first output voltage; when the voltage sample value is different from the voltage expected value, the first output voltage is adjusted based on the difference between the voltage sample value and the voltage expected value.
In practical applications, the feedback sub-unit may respectively adjust the first output voltage and the first output current, or may simultaneously adjust the first output voltage and the first output current through a logic operation.
In the above solution, the second PSU2 includes: the second current detection unit is used for sampling a second output current of the second PSU2 when the first PSU1 and the second PSU2 are simultaneously connected to the load share bus; and the second current regulating unit is used for regulating the second output current of the second PSU2 based on the second output current and a preset load current sharing strategy, so that the second output current is consistent with the first output current.
The following is a description of a preferred embodiment of the load balancing apparatus provided in this embodiment.
Still referring to fig. 1, the load sharing apparatus includes a first PSU1, a second PSU2, and a load share bus 3, wherein the load share apparatus includes a first PSU1, a second PSU2, and a load share bus 3, wherein the first PSU1 and the second PSU2 have different powers when fully loaded, and are respectively connected to the load share bus 3 through a first diode 41 and a second diode 42, and when a first voltage output from the first PSU1 to the load share bus 3 is smaller than a second voltage output from the second PSU2 to the load share bus 3, the diode 42 connected to the second PSU2 is turned on, and conversely, the diode 41 connected to the first PSU1 is turned on.
First, the first PSU is described.
Referring to fig. 6, the first PSU1 includes: the device comprises a voltage conversion unit 11, a voltage detection unit 12, a current detection unit 13, a proportional amplification unit 14, a load current sharing unit 15 and a feedback unit 16.
The current detecting unit 13 is the first current detecting unit 51, the proportional amplifying unit 14 is the current amplifying subunit, the load equalizing unit 15 is the load equalizing subunit, and the feedback unit 16 is the feedback subunit, so that the first current adjusting unit 52 includes the proportional amplifying unit 14, the load equalizing unit 15, and the feedback unit 16.
Specifically, the voltage conversion unit is a two-stage converter of the input power supply of the first PSU, and is configured to convert the voltage value of the input terminal into a first output voltage meeting the power requirement;
the voltage detection unit is used for sampling the voltage of the first output voltage and providing the voltage to the feedback unit;
the current detection unit is used for sampling a first output current of the output end;
the proportion amplification unit is used for carrying out proportion amplification on first sampling voltage which is sampled by the current detection unit and used for representing first output current according to a preset load current sharing strategy shown in the table 1 to obtain first voltage, and outputting the first voltage to the load current sharing unit and the load current sharing bus;
and the load current equalizing unit is used for calculating the difference value of the first voltage input by the proportion amplifying subunit and the second voltage input by the second PSU when the first voltage is less than the second voltage of the second PSU, and feeding the difference value back to the feedback unit.
The feedback unit is used for comparing the voltage sampling value of the first output fed back by the voltage detection unit with the voltage expected value of the first output voltage; when the sampling value is different from the expected value, regulating the first output voltage based on the difference value of the sampling value and the expected value; and the current-sharing unit is also used for adjusting the first output current according to the difference value of the first voltage and the second voltage fed back by the load current-sharing unit.
Next, a second PSU2 is introduced.
In this embodiment, the second PSU2, consistent with the first PSU1, includes: the voltage conversion unit 21, the voltage detection unit 22, the current detection unit 23, the proportional amplification unit 24, the load current equalizing unit 25, and the feedback unit 26 are not described in detail herein.
It should be noted that the functions implemented by the above units may be implemented in one or more functional modules, and the present invention is not limited in particular.
It should be noted that the description of the above embodiments of the apparatus is similar to the description of the above method, and has the same beneficial effects as the embodiments of the method, and therefore, the detailed description is omitted. For technical details that are not disclosed in the embodiments of the apparatus of the present invention, those skilled in the art should refer to the description of the embodiments of the method of the present invention to understand, and for brevity, will not be described again here.
In addition, in one or more embodiments, a scheme for achieving load current sharing by only two power supplies with different powers is described, and a scheme for achieving load current sharing by multiple (i.e., more than two) power supplies with different powers is consistent with the above, and output currents of the power supplies are adjusted to be consistent, so that load current sharing is achieved, which is not described in detail herein.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method of load sharing, comprising:
when the first power supply and the second power supply are simultaneously connected to a load current-sharing bus, sampling a first output current of the first power supply, wherein the first power supply and the second power supply have different powers;
and adjusting the first output current of the first power supply based on the first output current and a preset load current sharing strategy, so that the first output current is consistent with the second output current of the second power supply.
2. The method of claim 1, further comprising:
when the first power supply and the second power supply are simultaneously connected to a load current-sharing bus, sampling a second output current of the second power supply;
and adjusting the second output current based on the second output current and the preset load current sharing strategy to enable the second output current to be consistent with the first output current.
3. The method of claim 1, wherein the adjusting the first output current of the first power source based on the first output current and a preset load sharing strategy comprises:
amplifying a first sampling voltage used for representing the first output current according to the preset load current sharing strategy to obtain a first voltage;
when the first voltage is smaller than a second voltage, the first output current is adjusted based on a difference value between the first voltage and the second voltage, wherein the second voltage is a voltage output by the second power supply to the load current sharing bus.
4. The method of claim 3, wherein after said obtaining the first voltage, the method further comprises:
outputting the first voltage to the load share bus such that the second power supply regulates the second output current according to the first voltage when the first voltage is greater than the second voltage.
5. The method of claim 1, wherein prior to said sampling the first output current of the first power supply, the method further comprises:
performing voltage conversion on the input voltage of the first power supply to obtain a first output voltage;
sampling the first output voltage to obtain a voltage sampling value;
comparing the voltage sampling value with a voltage expected value of the first output voltage;
when the voltage sample value is different from the voltage desired value, adjusting the first output voltage based on a difference between the voltage sample value and the voltage desired value.
6. A device for load sharing, the device comprising: the power source comprises a first power source, a second power source and a load current sharing bus, wherein the first power source and the second power source have different powers; wherein,
the first power supply is used for sampling a first output current of the first power supply when the first power supply and the second power supply are simultaneously connected to the load current sharing bus, and adjusting the first output current of the first power supply based on the first output current and a preset load current sharing strategy to enable the first output current to be consistent with a second output current of the second power supply.
7. The apparatus of claim 6, wherein the first power source comprises:
the first current detection unit is used for sampling the first output current when the first power supply and the second power supply are simultaneously connected to the load current-sharing bus;
the first current adjusting unit is configured to adjust a first output current of the first power supply based on the first output current and the preset load current sharing strategy, so that the first output current is consistent with a second output current of the second power supply.
8. The apparatus of claim 7, wherein the first current regulating unit comprises:
the proportion amplification subunit is used for amplifying a first sampling voltage used for representing the first output current according to the preset load current sharing strategy to obtain a corresponding first voltage;
the load current sharing subunit is used for calculating a difference value between the first voltage and a second voltage when the first voltage is smaller than the second voltage, wherein the second voltage is the voltage output by the second power supply to the load current sharing bus;
a feedback subunit configured to adjust the first output current based on a difference between the first voltage and the second voltage.
9. The apparatus of claim 8, wherein the first power supply further comprises:
the voltage conversion unit is used for performing voltage conversion on the input voltage of the first power supply before sampling the first output current to obtain a first output voltage;
the voltage detection unit is used for sampling the first output voltage to obtain a voltage sampling value;
correspondingly, the feedback subunit is further configured to compare the voltage sampling value with a voltage expected value of the first output voltage; when the voltage sample value is different from the voltage desired value, adjusting the first output voltage based on a difference between the voltage sample value and the voltage desired value.
10. The apparatus of claim 6, wherein the second power source comprises:
the second current detection unit is used for sampling second output current of the second power supply when the first power supply and the second power supply are simultaneously connected to a load current-sharing bus;
and the second current adjusting unit is used for adjusting the second output current based on the second output current and the preset load current sharing strategy, so that the second output current is consistent with the first output current.
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| CN106160013A (en) * | 2016-06-30 | 2016-11-23 | 温州大学 | The parallel operation system Lycoperdon polymorphum Vitt optimal control method that the expectation of a kind of current-sharing deviation is minimum |
| WO2018035810A1 (en) * | 2016-08-25 | 2018-03-01 | 深圳市大疆创新科技有限公司 | Card reader |
| CN112684874A (en) * | 2020-12-30 | 2021-04-20 | 联想(北京)有限公司 | Device and method for supplying power by multiple power supplies |
| EP4135182A4 (en) * | 2020-04-07 | 2024-10-16 | LG Innotek Co., Ltd. | LOAD SHARING CONTROL DEVICE |
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| CN106160013B (en) * | 2016-06-30 | 2018-11-06 | 温州大学 | A kind of stream deviation it is expected the parallel operation system grey optimal control method of minimum |
| WO2018035810A1 (en) * | 2016-08-25 | 2018-03-01 | 深圳市大疆创新科技有限公司 | Card reader |
| EP4135182A4 (en) * | 2020-04-07 | 2024-10-16 | LG Innotek Co., Ltd. | LOAD SHARING CONTROL DEVICE |
| CN112684874A (en) * | 2020-12-30 | 2021-04-20 | 联想(北京)有限公司 | Device and method for supplying power by multiple power supplies |
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