Power supply system and method with power management mechanism

Abstract

A power supply method with a power management mechanism includes: capturing the power supply request information of a power supply requesting device, generating a list of devices to be powered and the power to be requested; judging whether the current requesting device satisfies both the power-on stability condition and the power sufficiency condition, and the power supply requesting devices with a higher priority level than the current requesting device are all operated in the powered-on mode, or the power supply requesting devices operating in the powered-on mode have entered a stable working state and meet the power sufficiency condition; when the system stable residual power of the power supply system is not less than the individual request power of the current requesting device, the power sufficiency condition is met; when both conditions are met, the current requesting device is operated in the powered-on mode; and the current requesting device is removed from the list of devices to be powered and the power to be requested is updated.

Description

Technical Field

[0001] The present invention relates to power supply technology, and in particular to a power supply system and method with a power management mechanism. Background Art

[0002] Ethernet power technology can not only transmit data signals between devices, but also provide DC power. This technology not only has high wiring compatibility, but also has many advantages such as low power supply cost, high support rate of powered devices, and easy power supply management.

[0003] In the power supply system implemented by the above technology, a common power management method is to determine the power-on order of the powered devices based on the priority of the powered devices, and to determine the order of removing the powered devices when the power is insufficient. However, such a method often results in inefficient use of resources and fails to achieve flexible power management. Summary of the invention

[0004] To solve the problems of the background art, an object of the present invention is to provide a power supply system and method with a power management mechanism to improve the background art.

[0005] The present invention includes a power supply method with a power management mechanism, which is applied to a power supply system. The power supply method includes: capturing the request power supply information of multiple request power supply devices connected to the power supply equipment to generate a list of devices to be powered and the power to be requested; selecting one of the request power supply devices operating in the waiting power supply mode as the current request device; judging whether the current request device satisfies both the power-on stability condition and the power sufficiency condition, and judging that the current request device satisfies the power-on stability condition when other request power supply devices with a higher priority level than the current request device are already operating in the powered-on mode, or all request power supply devices operating in the powered-on mode have entered a stable working state, and judging that the current request device satisfies the power sufficiency condition when the system stable residual power of the power supply system is not less than the individual request power of the current request device; when the current request device satisfies both the power-on stability condition and the power sufficiency condition, making the current request device operate in the powered-on mode so that it is powered by the power supply equipment; and removing the current request device from the list of devices to be powered and updating the power to be requested.

[0006] The present invention also includes a power supply system with a power management mechanism, which includes: a power supply device, a memory, and a processing circuit. The memory is configured to store computer-readable instructions. The processing circuit is electrically coupled to the power supply device and the memory, and is configured to retrieve the computer-readable instructions from the memory to execute the power supply method. The power supply method includes: capturing the request power supply information of multiple request power supply devices connected to the power supply equipment to generate a list of devices to be powered and the power to be requested; selecting one of the request power supply devices operating in the power supply mode as the current request device; judging whether the current request device satisfies both the power-on stability condition and the power sufficiency condition, and judging that the current request device satisfies the power-on stability condition when other request power supply devices with a higher priority level than the current request device are already operating in the power-on mode, or all request power supply devices operating in the power-on mode have entered a stable working state, and judging that the current request device satisfies the power sufficiency condition when the system stable residual power of the power supply system is not less than the individual request power of the current request device; when the current request device satisfies both the power-on stability condition and the power sufficiency condition, making the current request device operate in the power-on mode so that it is powered by the power supply equipment; and removing the current request device from the list of devices to be powered, and updating the power to be requested.

[0007] The features, structure and efficacy of the present invention are described in detail below with reference to the accompanying drawings as preferred embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram showing a power supply system with a power management mechanism according to an embodiment of the present invention;

[0009] Figure 2 A flow chart showing a power supply method with a power management mechanism according to an embodiment of the present invention;

[0010] Figure 3 A flowchart showing a calculation of power consumption of a power requesting device operating in a powered-on mode in one embodiment of the present invention; and

[0011] Figure 4 A flowchart of a powered device removal procedure is shown in one embodiment of the present invention. DETAILED DESCRIPTION

[0012] An object of the present invention is to provide a power supply system and method with a power management mechanism to perform flexible power management without having to completely determine resource allocation based on the priority level of a device requesting power supply.

[0013] Please refer to Figure 1 . Figure 1The schematic diagram of a power supply system 100 with a power management mechanism in one embodiment of the present invention is shown. The power supply system 100 includes a power supply device 110 , a memory 120 , and a processing circuit 130 .

[0014] The power supply device 110 includes at least one power supply unit. Figure 1 FIG. 1 shows n power supply units PSE1 to PSE2 by way of example. N , n is a positive integer greater than or equal to 1. The power supply device 110 can be connected to at least one power supply requesting device. Figure 1 In the figure, m power requesting devices are shown as examples, labeled as PD1 to PD M , m is a positive integer greater than or equal to 1. In one embodiment, the power supply device 110 and the power requesting devices PD1-PD M The power is transmitted between the power supply units PSE1 to PSE2 based on, for example, but not limited to, Power over Ethernet (PoE) technology. N Provide power PO to the power supply requesting devices PD1~PD M , so that the request power supply device PD1 ~ PD M Some of them operate accordingly.

[0015] In different embodiments, the memory 120 and the processing circuit 130 may be disposed outside the power supply device 110, or disposed inside the power supply device 110. The present invention is not limited thereto.

[0016] The memory 120 may be any storage device configured to store data, such as, but not limited to, random access memory (RAM), read only memory (ROM), or a hard disk. It should be noted that the memory 120 may include only a single storage device or multiple storage devices in different embodiments to store different types of data. In one embodiment, the memory 120 is configured to store computer executable instructions 125.

[0017] The processing circuit 130 is electrically coupled to the power supply device 110 and the memory 120. In one embodiment, the processing circuit 130 can be configured to retrieve and execute computer executable instructions 125 from the memory 120. The computer executable instructions 125 include, for example, but not limited to, firmware / drivers and related instructions for hardware modules such as the power supply device 110 and the memory 120 to execute. The processing circuit 130 can execute the computer executable instructions 125 to access signals or data of the power supply device 110 and the memory 120 and perform calculations, thereby executing the functions of the power supply system 100.

[0018] The operation of the power supply system 100 will be described in more detail below.

[0019] Please also refer to Figure 2 . Figure 2 The flowchart of a power supply method 200 with a power management mechanism in one embodiment of the present invention is shown. The power supply method 200 is applied to, for example, but not limited to Figure 1 In more detail, the processing circuit 130 is configured to execute the computer executable instructions 125, thereby executing the power supply method 200. An embodiment of the power supply method 200 is as follows: Figure 2 As shown, the following steps are included.

[0020] In step S210 , the processing circuit 130 captures the power requesting devices PD1 ˜PD2 connected to the power supply device 110 . M The power supply request information RI1 to RI M , to generate a list of devices to be powered LI and a power to be requested UP.

[0021] In one embodiment, when requesting power supply devices PD1-PD M When connected to the power supply device 110, a power supply request signal (not shown) is transmitted to the power supply device 110, and then received by the processing circuit 130 to request power supply information RI1-RI M However, if any of the requesting power supply devices PD1~PD M If the power supply request signal is not transmitted, the processing circuit 130 will not capture the corresponding power supply request information.

[0022] In one embodiment, the power supply information RI1-RI M The content includes, for example but not limited to, information such as identifier, individual requested power, priority level, etc. or a combination thereof. After the power supply system 100 starts to operate, the processing circuit 130 may reserve a period of time to obtain the above information.

[0023] The identifier is any identifier that can be used to identify the power supply requesting device PD1~PD M The individual power request is, for example, but not limited to, each requesting power supply device PD1 to PD M The static power distribution of each requesting power supply device PD1~PD M The maximum power required is a fixed value. The priority level is generated based on, for example, but not limited to, the device number, the user's default priority level parameter, or a combination of the above parameters in a weighted manner.

[0024] It should be noted that the above power supply request information RI1~RI MThe content included is only an example. In other embodiments, the power supply information RI1-RI M Different contents can be included according to needs.

[0025] When obtaining the power supply request information RI1~RI M , the processing circuit 130 has not yet started to perform power management on the power supply system 100, nor has it started to request power supply devices PD1 to PD M Power supply is performed. Request power supply devices PD1~PD M All operate in standby power mode.

[0026] Therefore, the list of devices to be powered generated by the processing circuit 130 may include the power requesting devices PD1 to PD M The power UP to be requested may include, for example, but not limited to, individual requesting power supply devices PD1 to PD M The individual requested powers and the total requested power.

[0027] In step S220 , the processing circuit 130 selects the requesting power supply devices PD1 to PD2 operating in the standby power supply mode. M One of them is used as the current request device.

[0028] In one embodiment, the processing circuit 130 supplies power to the power supply devices PD1-PD M The priority order of the requesting power supply device is selected from PD1 to PD M A requesting power supply device that has made a power supply request is used as the current requesting device.

[0029] In step S230 , the processing circuit 130 determines whether the priority mechanism is enabled. It should be understood that the processing circuit 130 can determine whether to enable the priority mechanism according to the requesting power supply devices PD1 -PD M That is, if the priority mechanism is not enabled, it means that the processing circuit 130 may not power on the power supply devices PD1 to PD M The priority level is set to power on.

[0030] In step S240 : when the processing circuit 130 determines that the priority mechanism is enabled, the processing circuit 130 further determines whether the current requesting device satisfies both the power-on stability condition and the power sufficient condition.

[0031] In one embodiment, other requesting power supply devices PD1-PD MWhen all requesting devices operating in the powered-on mode or all requesting devices operating in the powered-on mode have entered a stable working state, the processing circuit 130 determines that the current requesting device meets the power-on stability condition.

[0032] The powered mode is a mode in which the power supply device is requested to operate after receiving power from the power supply device 110. The stable working state in the powered mode will be described in the following paragraphs.

[0033] In one embodiment, when the system stable remaining power of the power supply system 100 is not less than the individual requested power of the current requesting device, the processing circuit 130 determines that the current requesting device meets the power sufficient condition.

[0034] The power requesting devices operating in the powered-on mode each have a power consumption, and the power consumption of all the power requesting devices operating in the powered-on mode is summed up to form the total power consumption. The system stable surplus power is the power consumption of all power supply units PSE1 to PSE2 of the power supply device 110. N The difference between the total system power of the power supply that can be supplied and the total power consumption. The power consumption of each requesting power supply device operating in the powered-on mode can be calculated in different ways depending on whether each requesting power supply device operates in the static power management mode or the dynamic power management mode, and operates in a stable working state or an unstable working state.

[0035] The following description will be made by taking the power requesting device PD4 operating in the powered-on mode as an example.

[0036] Please refer to Figure 3 . Figure 3 The flowchart of a procedure 300 for calculating power consumption of the power requesting device PD4 operating in the powered-on mode is shown in one embodiment of the present invention.

[0037] In step S310 : the processing circuit 130 determines whether the requesting power supply device PD4 operates in the dynamic power management mode.

[0038] In step S320 : when the requesting power device PD4 is not operating in the dynamic power management mode, the processing circuit 130 determines that the requesting power device PD4 is operating in the static power management mode, and makes the power consumption of the requesting power device PD4 the static allocated power of the requesting power device PD4 .

[0039] In step S330: when the processing circuit 130 determines that the power supply device PD4 operates in the dynamic power management mode, it further determines whether the power supply device PD4 is in a preset power-on time interval after starting operation. In one embodiment, the length of the preset power-on time interval is, for example, but not limited to, 100 to 200 milliseconds.

[0040] In step S340: when the processing circuit 130 determines that the power supply device PD4 is in the preset power-on time interval after the initial operation, the power supply device PD4 is determined to be in the power-on state, which is an unstable working state. Further, the processing circuit 130 makes the power consumption of the power supply device PD4 the static allocated power of the power supply device PD4.

[0041] In step S350: when the processing circuit 130 determines that the requested power supply device PD4 is not in the preset power-on time interval after the initial operation (that is, the operation time of the requested power supply device PD4 has exceeded the preset power-on time), it will determine whether the requested power supply device PD4 has a power change rate greater than the preset change threshold value, and determine whether it is in the preset transition time interval.

[0042] In one embodiment, the power change rate is obtained by sampling the power value of the requesting power supply device PD4 according to a preset sampling interval and calculating the power difference and the time ratio. In different embodiments, the length of the sampling interval and the size of the preset change threshold value can be set to different values ​​according to actual needs. For example, the length of the sampling interval can be, for example but not limited to, hundreds of milliseconds, and the size of the preset change threshold value can be, for example but not limited to, 10% to 30%.

[0043] In step S360: when the processing circuit 130 determines that the power supply device PD4 has a power change rate greater than the default change threshold value and is within the preset transition time interval, the power supply device PD4 is determined to be operating in a power transition state, which is an unstable working state. Further, the processing circuit 130 makes the power consumption of the power supply device PD4 the static allocated power of the power supply device PD4.

[0044] In different embodiments, the duration of the preset transition time interval can be set to different values ​​according to actual needs.

[0045] In step S370: when the processing circuit 130 determines that the power supply device PD4 has a power change rate that is not greater than the preset change threshold value, or has exceeded the preset transition time interval, the power supply device PD4 is determined to be operating in a stable working state. Further, the processing circuit 130 determines that the power consumption of the power supply device PD4 is the real-time power consumption of the power supply device PD4.

[0046] Other power requesting devices can calculate power consumption according to the above process, which will not be described in detail here. Therefore, the processing circuit 130 can determine whether the current requesting device meets the power-on stability condition and the power sufficient condition according to the above method.

[0047] Back to Figure 2In step S250 : when the processing circuit 130 determines that the current requesting device satisfies both the power-on stability condition and the power sufficient condition, the processing circuit 130 enables the current requesting device to operate in the powered-on mode so that the power supply device 110 can supply power.

[0048] In step S255 : the processing circuit 130 removes the current requesting device from the list of devices to be powered LI, and updates the requested power UP.

[0049] In step S260 : when the processing circuit 130 determines that the current requesting device does not satisfy one of the power-on stability condition and the power sufficient condition, the processing circuit 130 further determines whether the current requesting device satisfies the power-on stability condition.

[0050] In step S270 , the processing circuit 130 will not power on the current requesting device when it is determined that the current requesting device does not meet the power-on stability condition. On the other hand, when the processing circuit 130 determines that the current requesting device meets the power-on stability condition, the process will execute the powered device removal procedure 400 .

[0051] Please refer to Figure 4 . Figure 4 A flowchart of a powered device removal procedure 400 is shown in one embodiment of the present invention.

[0052] In step S410 : the processing circuit 130 determines whether the power supply of the power supply device 110 is within a preset range. In one embodiment, the preset range may be, for example, a numerical interval of a percentage (eg, 10%) above or below a rated power supply output value.

[0053] In step S420: when the power supply of the power supply device 110 is within the preset range, the processing circuit 130 calculates the accumulated power for multiple device combinations of requesting power supply devices operating in the powered-on mode and having a lower priority level than the current requesting device according to the priority levels from low to high. Each device combination may include one or more requesting power supply devices.

[0054] In step S430 : the processing circuit 130 selects one of the aforementioned device combinations as the selected device combination, the accumulated power corresponding to the selected device combination is not less than the individual request power of the current requesting device and the accumulated power corresponding to the selected device combination is the smallest compared to the accumulated powers of other device combinations.

[0055] In step S440 : the processing circuit 130 determines whether the selected device combination is successfully selected.

[0056] In step S450: when the processing circuit 130 successfully selects the selected device combination, it stops supplying power to the power requesting device corresponding to the selected device combination. The process will return to Figure 2In step S250, the processing circuit 130 enables the current requesting device to operate in the powered-on mode, and then proceeds to step S255 to remove the current requesting device from the list of devices to be powered LI, and update the requested power UP.

[0057] In step S460: when step S410 determines that the power supply of the power supply device 110 is not within the preset range or step S440 fails to successfully select the selected device combination, the processing circuit 130 does not remove any requesting power supply device operating in the powered-on mode. The process will return to Figure 2 In step S270 , the processing circuit 130 does not power on the current requesting device.

[0058] The following will use a usage scenario to explain the powered device removal procedure 400 in more detail. In this usage scenario, the number of requesting power devices is 4, and the priority levels are requested power devices PD1 to PD4 from high to low (i.e., power device PD1 has the highest priority level, and power device PD4 has the lowest priority level). Requesting power devices PD2 to PD4 operate in the powered-on mode, consuming power of 30 watts, 4 watts, and 4 watts respectively, and the system stable remaining power of the power supply device 110 is 2 watts. Requesting power device PD1 is the current requesting device, and its individual request power is 15 watts.

[0059] Since the priority of the requesting power supply device PD1 is higher than that of all the requesting power supply devices PD2~PD4, the processing circuit 130 will calculate the cumulative power for each device combination, and the cumulative power of these device combinations is arranged from low to high as follows: the cumulative power of only the requesting power supply device PD4 (4 watts), the cumulative power of only the requesting power supply device PD3 (4 watts), the cumulative power of the requesting power supply devices PD4 and PD3 (8 watts), the cumulative power of only the requesting power supply device PD2 (30 watts), the cumulative power of the requesting power supply device PD2 and the requesting power supply device PD4 (34 watts), the cumulative power of the requesting power supply device PD2 and the requesting power supply device PD3 (34 watts), and the cumulative power of the requesting power supply devices PD2~PD4 (38 watts).

[0060] As can be seen from the above, there are four device combinations whose cumulative power (respectively 30 watts, 34 watts, 34 watts, and 38 watts) is not less than the individual requested power (15 watts) of the current requesting device, among which the cumulative power (30 watts) corresponding to the device combination including only the requesting power device PD2 is the smallest compared to the cumulative power of other device combinations. Therefore, the device combination including only the requesting power device PD2 will be selected as the device combination. The processing circuit 130 will stop supplying power to the requesting power device PD2 corresponding to this device combination, thereby making the requesting power device PD1 with a high priority level operate in the powered-on mode.

[0061] Since in the above usage scenario, the power consumption of the lower priority requesting power devices PD3-PD4 is too small (the cumulative power of the two is 8 watts), and cannot meet the demand of the requesting power device PD1 (15 watts). Therefore, through the above-mentioned power-on device removal procedure 400, the processing circuit 130 can power on the higher priority requesting power devices when the number of removed requesting power devices is the least and the number of removals is the least, so as to avoid removing the lower priority requesting power devices first and causing multiple removal and re-addition procedures.

[0062] Back to Figure 2 In step S245: when the processing circuit 130 determines that the priority mechanism is not enabled, the processing circuit 130 further determines whether the current requesting device satisfies both the power-on stability condition and the power sufficient condition. The determination method of whether the power-on stability condition and the power sufficient condition are satisfied has been described in the previous paragraph and will not be repeated here.

[0063] Among them, when the current requesting device satisfies both the power-on stability condition and the sufficient power condition, the process will also perform steps S250 and S255, so that the processing circuit 130 enables the current requesting device to operate in the powered-on mode, the power supply device 110 provides power, and the current requesting device is removed from the list of devices to be powered LI, and the requested power UP is updated.

[0064] When the current requesting device does not satisfy one of the power-on stability condition and the power sufficient condition, the process will directly proceed to step S270 without considering the priority level, and the processing circuit 130 will not power on the current requesting device.

[0065] In step S280: After either step S255 or step S270, the processing circuit 130 will further determine whether the processing has been completed for all requesting power supply devices. When the processing circuit 130 determines that the processing has not been completed for all requesting power supply devices, the process will return to step S210, update the list of devices to be powered LI and the power to be requested UP, and continue to process the next requesting power supply device operating in the waiting power supply mode as the current requesting device.

[0066] In step S290: when the processing circuit 130 determines that all requesting power supply devices have been processed, the process will end. At this time, the list of devices to be powered LI will no longer have requesting power supply devices operating in the standby power supply mode, and the waiting power UP will be zero. However, it should be noted that if a new requesting power supply device is connected to the power supply device 110, the process will still start again from step S210.

[0067] It should be noted that the above implementation is only an example. In other embodiments, those skilled in the art can make changes and modifications without violating the spirit of the present invention. It should be understood that the steps mentioned in the above implementation, except for the order specifically stated, can be adjusted according to actual needs, and can even be executed simultaneously or partially simultaneously.

[0068] In some technologies, the power supply system often only manages power based on the priority of the power requesting devices. In such a situation, the power requesting devices with higher priority often occupy more resources, and the power requesting devices with lower priority are delayed or unable to share resources.

[0069] In contrast, the power supply system and method with a power management mechanism in the present invention allows the current requesting device with a lower priority to be powered on when the requesting power supply device in the power-on mode can maintain stability, and the power-on order does not necessarily have to be determined entirely by the priority level. In addition, when it is necessary to remove the requesting power supply device, it can also be removed according to the power size of the requesting power supply device, and the order of removal does not necessarily have to be determined entirely by the priority level. This method will have a more flexible application for the overall power configuration of the system.

[0070] Although the embodiments of the present invention are described above, the embodiments are not intended to limit the present invention. A person skilled in the art may make changes to the technical features of the present invention according to the explicit or implicit contents of the present invention. All these changes may fall within the scope of patent protection sought by the present invention. In other words, the scope of patent protection of the present invention shall be subject to the scope defined in the claims and this specification.

[0071] Description of Reference Numerals

[0072] 100: Power supply system

[0073] 110: Power supply equipment

[0074] 120: Memory

[0075] 125: Computer executable instructions

[0076] 130: Processing circuit

[0077] 200: Power supply method

[0078] S210~S290: Steps

[0079] 300:Calculation Program

[0080] S310~S370: Steps

[0081] 400: Power-on device removal procedure

[0082] S410~S460: Steps

[0083] LI: List of devices to be powered

[0084] PD1~PD M :Request power supply

[0085] PO: Power supply

[0086] PSE1~PSE N :Power supply unit

[0087] RI1~RI M :Request power supply information

[0088] UP: Power to be requested

Claims

1. A power supply method with a power management mechanism, applied to a power supply system, the power supply method comprising: Retrieving power request information respectively possessed by a plurality of power requesting devices connected to a power supply device to generate a list of devices to be powered and a power to be requested; Selecting one of the requesting power devices operating in a standby power mode as a current requesting device; Determine that all the requesting power supply devices operating in a powered-on mode have entered a stable working state, so as to determine that the current requesting device meets a power-on stability condition, wherein, for the requesting power supply device operating in the powered-on mode, when the power change rate of the requesting power supply device is not greater than a preset change threshold value or has exceeded a preset transition time interval, it is determined that the requesting power supply device is operating in a stable working state, wherein the preset transition time interval is after a preset power-on time interval after the requesting power supply device starts operating; It is determined that the system stable remaining power of the power supply system is not less than the individual requested power of the current requesting device, so as to determine that the current requesting device meets a power sufficiency condition, wherein the requesting power supply devices operating in the powered-on mode each have a power consumption, and the power consumptions of all the requesting power supply devices operating in the powered-on mode are summed up as a total power consumption, the system stable remaining power is the difference between the system total power of the power supply device and the total power consumption, and the power consumption of each requesting power supply device is determined by the following method: The power consumption of the requesting power supply device operating in a static power management mode is made to be the static allocated power of the requesting power supply device; The power consumption of the requesting power supply device operating in a dynamic power management mode and in an unstable working state is made to be the static allocated power of the requesting power supply device; and The power consumption of the power requesting device operating in the dynamic power management mode and in the stable working state is made to be the real-time power consumption of the power requesting device; When the current requesting device satisfies both the power-on stability condition and the power sufficient condition, enabling the current requesting device to operate in the powered-on mode so as to be powered by the power supply device; and The current requesting device is removed from the list of devices to be powered, and the power to be requested is updated.

2. The power supply method according to claim 1, characterized in that: For the power requesting device operating in the powered-on mode, the power supply method further includes: Determining that the power supply requesting device operates in a power-on state during the preset power-on time interval after the initial operation, the unstable working state includes the power-on state; It is determined that the power requesting device having a power change rate greater than a preset change threshold value after the preset startup time interval and in a preset transition time interval operates in a power transition state, and the unstable working state includes the power transition state.

3. The power supply method according to claim 1, characterized in that: When the priority mechanism is not enabled and the current requesting device does not meet one of the power-on stability condition and the power sufficient condition, not powering on the current requesting device; When the priority mechanism is enabled and the current requesting device does not meet the power-on stability condition and the power sufficient condition, not powering on the current requesting device; When the priority mechanism is enabled and the current requesting device satisfies the power-on stability condition but does not satisfy the power sufficiency condition, a powered device removal procedure is executed.

4. The power supply method according to claim 3, characterized in that: For the power requesting device operating in the powered-on mode, the powered-on device removal procedure further includes: Determining whether the power supply of the power supply device is within a preset range; If the power supply power is within the preset range, calculating a cumulative power for a plurality of device combinations corresponding to the requesting power supply devices having a priority level lower than that of the current requesting device according to the priority levels from low to high; Selecting one of the device combinations as a selected device combination, the accumulated power corresponding to the selected device combination is not less than the individual requested power of the current requesting device and the accumulated power corresponding to the selected device combination is the smallest compared to the accumulated powers of other device combinations; When the selected device combination is successfully selected, stopping supplying power to the power requesting device corresponding to the selected device combination; causing the current requesting device to operate in the powered-on mode; Remove the current requesting device from the list of devices to be powered, and update the power to be requested; and When the power supply power is not within the preset range or the selected device combination is not successfully selected, any of the power requesting devices operating in the powered-on mode is not removed.

5. The power supply method according to claim 3, characterized in that: The priority level is generated according to a device number, a user-preset priority level parameter or a combination thereof.

6. The power supply method according to claim 3, characterized in that: It also includes: According to the priority order of the power requesting devices, a power requesting device among the power requesting devices that has submitted a power request is made the current requesting device.

7. The power supply method according to claim 1, characterized in that: The power supply equipment and the power requesting device provide power based on the Ethernet power technology.

8. A power supply system with a power management mechanism, comprising:

1. Power supply equipment; a memory configured to store a computer readable instruction; as well as A processing circuit is electrically coupled to the power supply device and the memory, and is configured to retrieve the computer readable instructions from the memory to execute a power supply method, the power supply method comprising: Retrieving power request information respectively possessed by a plurality of power requesting devices connected to the power supply equipment to generate a list of devices to be powered and a power to be requested; Selecting one of the requesting power devices operating in a standby power mode as a current requesting device; Determine that all the requested power supply devices operating in the powered-on mode have entered a stable working state, so as to determine that the current requested device meets a power-on stability condition, wherein, for the requested power supply device operating in the powered-on mode, when the power change rate of the requested power supply device is not greater than a preset change threshold value or has exceeded a preset transition time interval, it is determined that the requested power supply device is operating in a stable working state, wherein the preset transition time interval is after a preset power-on time interval after the requested power supply device starts operating; It is determined that the system stable remaining power of the power supply system is not less than the individual requested power of the current requesting device, so as to determine that the current requesting device meets the power sufficiency condition, wherein the requesting power supply devices operating in the powered-on mode each have a power consumption, and the power consumptions of all the requesting power supply devices operating in the powered-on mode are summed up as a total power consumption, the system stable remaining power is the difference between the system total power of the power supply device and the total power consumption, and the power consumption of each requesting power supply device is determined by the following method: The power consumption of the requesting power supply device operating in a static power management mode is made to be the static allocated power of the requesting power supply device; The power consumption of the requesting power supply device operating in a dynamic power management mode and in an unstable working state is made to be the static allocated power of the requesting power supply device; and The power consumption of the requesting power supply device operating in the dynamic power management mode and in the stable working state is made to be the real-time power consumption of the requesting power supply device; when the current requesting device satisfies both the power-on stability condition and the power sufficient condition, the current requesting device is made to operate in the powered-on mode so as to be powered by the power supply device; and The current requesting device is removed from the list of devices to be powered, and the power to be requested is updated.

9. The power supply system according to claim 8, characterized in that: The power supply device includes at least one power supply unit, and the processing circuit and the memory are arranged outside the power supply device or inside the power supply device.

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