Power supply system and power supply method

Abstract

To provide a power supply system and a power supply method, in plural power source supply devices, which reduce the output power of the one having the highest maximum power.SOLUTION: A power supply system 100 is used for supplying power to a load 1, and is connected to a load shearing busbar 2. The power supply system 100 further includes two power source supply devices 10 and a control device 20. The two power source supply devices 10 are connected in parallel to the load 1, have the maximum power, and output the output power to the load 1. The control device 20 is electrically connected to the two power source supply devices 10, and when the two power source supply devices 10 fall under control conditions, the one having the highest maximum power in the two power source supply devices 10 adjusts the output power thereof based on a control signal from the control device 20 and a shared signal from the load shearing busbar 2 so that the output power in the two power source supply devices 10 is made equal or close.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply system, and more particularly to a power supply system and a power supply method that have at least two power supply devices and supply power. [Background technology]

[0002] Conventionally known power supply systems generally employ a configuration in which at least two power supplies are connected in parallel to provide a backup power source or increase the total output power of the power supply system. The power supplies cooperate with each other to supply power, i.e., the power supplies operate simultaneously, thereby increasing the total output power of the power supply system.

[0003] Regarding the function of increasing the total output power of the power supply system, by electrically connecting the multiple power supply devices to a load-sharing busbar, each power supply device can output output power correspondingly based on a shared signal on the load-sharing busbar, thereby achieving the purpose of maintaining a stable power supply to each power supply device.

[0004] If the plurality of power supplies have the same maximum power rating, the output power from the plurality of power supplies will be the same under the condition of the same shared signal. However, if the plurality of power supplies have different maximum power ratings, the plurality of power supplies will each output power at the same percentage of their respective maximum power under the condition of the same shared signal. That is, among the plurality of power supplies, the one with the highest maximum power will output a relatively high output power, while the one with the lower maximum power will output a relatively low output power.

[0005] For example, a power supply system includes a first power supply device and a second power supply device, where the maximum power of the first power supply device is 1200W and the maximum power of the second power supply device is 2000W.

[0006] If the load requires 320W of power, under the same shared signal condition, the output power of the first power supply will be 120W, which is 10% of the maximum power (1200W), and the output power of the second power supply will be 200W, which is 10% of the maximum power (2000W). Therefore, the total output power will be 320W, which can meet the power consumption needs of the load.

[0007] If the load requires 1600W of power, and the same shared signal is used, the output power of the first power supply will be 600W, which is 50% of the maximum power (1200W), and the output power of the second power supply will be 1000W, which is 50% of the maximum power (2000W). Therefore, the total output power will be 1600W.

[0008] In other words, the output power of the second power supply is greater than that of the first power supply, and therefore, long-term use may shorten the lifespan of the power supply with the highest maximum power (the second power supply) and cause problems with the reliability of the power supply system.

[0009] Furthermore, in terms of safety regulations, when the input voltage of each power supply falls within the low line range, i.e., when the input voltage is between AC 90V and AC 120V, the output power of each power supply must not exceed the limit of the output power of each power supply (e.g., 1000W). In other words, even if the maximum power of a power supply is greater than 1000W, when it falls within the low line range, the limited maximum power is 1000W. Therefore, the maximum output power can only be 1000W.

[0010] If the load requires 320W of power, the output power of the first power supply will be 120W and the output power of the second power supply will be 200W, so the total output power will be 320W, which can meet the power consumption needs of the load.

[0011] If the load requires 1600W of power, the output power of the first power supply will be 600W and the output power of the second power supply will be 1000W, resulting in a total output power of 1600W. At this time, the output power of the second power supply has reached the safety limit, but can still meet the power consumption needs of the load.

[0012] However, if the load requires more than 1600W of power, the power supply system will not be able to supply enough power because the output power of the second power supply has already reached the upper limit of the safety regulations, and even if the total maximum power of the two power supplies is still greater than 1600W, the power supply system will not be able to output a large total output power any more when the input voltage falls into the low voltage range, thereby limiting the total output power of the power supply system. Summary of the Invention [Problem to be solved by the invention]

[0013] In view of this, an object of the present invention is to provide a power supply system and a power supply method that can reduce the output power of one of a plurality of power supply devices that has the highest maximum power. [Means for solving the problem]

[0014] To achieve the above object, the present invention provides a power supply system for supplying power to a load and connected to a load-sharing busbar. The power supply system includes at least two power supplies and a control device, wherein the at least two power supplies are connected in parallel to the load, each having a maximum power and outputting an output power to the load that is less than or equal to the maximum power. Each power supply receives a sharing signal from the load-sharing busbar and adjusts its output power based on the sharing signal. The control device is electrically connected to the at least two power supplies and receives the maximum power from each power supply. When a control condition is met, the control device outputs a control signal to the power supply with the highest maximum power among the at least two power supplies and adjusts its output power so that the output powers of the at least two power supplies are equal or close to each other. The control condition includes a condition that the maximum power of the power supply with the highest maximum power among the at least two power supplies is greater than a predetermined maximum power and greater than the maximum power of the other power supplies.

[0015] A power supply method provided by the present invention is applicable to a power supply system. The power supply system includes at least two power supplies and a control device. The at least two power supplies are connected in parallel to a load, each having a maximum power and outputting an output power to the load that is less than or equal to the maximum power. Each power supply receives a sharing signal from the load-sharing busbar and adjusts its output power based on the sharing signal. The power supply method includes a step in which the control device receives the maximum power from each of the power supplies. If a control condition is met, the control device outputs a control signal to the at least two power supplies with the highest maximum power. The control condition includes a condition that the maximum power of the at least two power supplies with the highest maximum power is greater than a predetermined maximum power and greater than the maximum power of the other power supplies. The at least two power supplies with the highest maximum power adjusts its output power based on the control signal so that the output powers of the at least two power supplies are equal or close to each other. [Effects of the Invention]

[0016] The advantage of the present invention is that the power supply system can maximize the total output power of the at least two power supply devices while optimizing the reliability of the power supply system by adjusting the output power of the at least two power supply devices that has the highest maximum power so that the output powers of the at least two power supply devices are equal or close to each other, thereby extending the service life of the power supply device that has the highest maximum power.

[0017] According to the above concept, the at least two power supply devices are electrically connected to an AC power source, and each power supply device transmits input voltage information of the AC power source to the control device. The control condition further includes that the input voltage information of the power supply device with the highest maximum power falls within a low voltage range. Therefore, while satisfying safety regulations, the total output power of the power supply system can be increased and the sum of the output powers of the at least two power supply devices can be maximized. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic diagram showing a power supply system according to a first preferred embodiment of the present invention; [Figure 2] 1 is a schematic diagram showing a power supply device according to a first preferred embodiment of the present invention; [Figure 3] FIG. 2 is a circuit diagram of a selection circuit according to a first preferred embodiment of the present invention. [Figure 4] 2 is a flowchart of a power supply method according to the preferred embodiment of the present invention. [Figure 5] FIG. 10 is a schematic diagram showing a power supply device according to a third preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] To more clearly explain the present invention, preferred embodiments will be described in detail below with reference to the drawings. Figures 1 to 3 show a power supply system 100 according to a first preferred embodiment of the present invention. The power supply system 100 is used to supply power to a load 1 and is connected to a load sharing bus 2. The power supply system 100 includes at least two power supply devices 10 and a control device 20.

[0020] Although two power supply devices 10 are described as an example in this embodiment, the present invention is not limited thereto, and three or more power supply devices 10 may be used. The two power supply devices 10 are a first power supply device 10A and a second power supply device 10B, respectively. They are electrically connected to an AC power source 3 and connected in parallel to the load 1, converting AC current from the AC power source 3 to DC current and supplying it to the load 1. The AC power source 3 may be a high-voltage range (high line) or a low-voltage range (low line). The high-voltage range is, for example, AC 180V to 264V, and the low-voltage range is, for example, AC 90V to 120V. Each power supply device 10 has a maximum power and outputs output power to the load 1. The maximum power is the rated maximum output power of each power supply device 10 itself, and each output power is less than or equal to the maximum power. In this embodiment, each power supply device 10 outputs a constant voltage. Therefore, the maximum power and output power are determined by the output current. For example, if the maximum power is 2000 W and the constant voltage DC is 54.5 V, when the AC power supply 3 is in the high voltage range, the maximum output current is approximately 36.7 A. When the AC power supply 3 is in the low voltage range, the limited maximum power is 1000 W. Therefore, the maximum output current is limited to approximately 18.34 A. Each power supply 10 receives a shared signal from the load-sharing busbar 2 and adjusts its output power based on the shared signal. In this embodiment, the shared signal is a voltage signal and corresponds to the output power, e.g., output current, of each power supply 10.

[0021] The two power supply devices 10 are electrically connected to the control device 20. In this embodiment, the two power supply devices 10 are electrically connected to the control device 20 via a communication interface, for example, a power management bus bar 30 (PM Bus), to communicate with the control device 20.

[0022] Since the two power supply devices 10 have the same configuration, only one power supply device 10 will be described. The power supply device 10 includes an output circuit 11, a comparison module 12, an output power adjustment module 13, and a signal processing module 14. The output circuit 11 is electrically connected to the load 1, the comparison module 12, and the output power adjustment module 13. The output circuit 11 supplies the output power to the load 1 and outputs a feedback signal. The feedback signal corresponds to the power output by the output circuit 11. In this embodiment, the feedback signal is a voltage signal and corresponds to the output current output by the output circuit 11. The comparison module 12 is electrically connected to the load-sharing busbar 2, the output circuit 11, and the output power adjustment module 13. The comparison module 12 receives the feedback signal from the output circuit 11 and the shared signal from the load-sharing busbar 2, and outputs an adjustment signal to the output power adjustment module 13 based on the shared signal and the feedback signal. The output power adjustment module 13 adjusts the output power output by the output circuit 11 based on the adjustment signal, i.e., adjusts the output current. The signal processing module 14 is electrically connected to the power management busbar 30 and the comparison module 12, and can selectively output a compensation signal to the comparison module 12 when controlled by the control device 20. The signal processing module 14 real-timely detects the output power of the output circuit 11 while detecting input voltage information of the AC power supply 3. In this embodiment, the input voltage information may be, for example, the voltage value of the AC power supply 3.

[0023] In this embodiment, the signal processing module 14 includes a microprocessor 141 and a selection circuit 142 electrically connected to each other. The microprocessor 141 is electrically connected to the power management bus bar 30. The microprocessor 141 stores the maximum power value of the power supply device 10, the input voltage information, and the instantaneous output power value. The values ​​may be stored in a memory 141A of the signal processing module 14. The memory 141A may be built into the microprocessor 141 or may be independent from the microprocessor 141. The microprocessor 141 controls the selection circuit 142 to generate the compensation signal. The selection circuit 142 may, for example, include a voltage adder circuit. FIG. 3 exemplarily shows the selection circuit 142 as a non-inverting voltage adder circuit, which includes an operational amplifier 142A and a plurality of resistors R1 to R4. The output terminal 142A1 of the operational amplifier 142A is electrically connected to the comparison module 12, and the resistors R1 and R2 are electrically connected to the microprocessor 141.

[0024] The microprocessor 141 outputs a first voltage to resistor R1 and / or a second voltage to resistor R2, and the first and second voltages are combined with the resistances of resistors R1 and R2 to convert the first and second voltages into the compensation signal via the operational amplifier 142A. In the circuit shown in FIG. 3, the compensation signal is a positive voltage signal, whose value is determined by the first and second voltages output by microprocessor 141 and resistors R1 and R2. When it is not necessary to output the compensation signal, the microprocessor 141 outputs 0V to resistors R1 and R2. As a result, the output terminal 142A1 of operational amplifier 142A becomes 0V, meaning that the selection circuit 142 does not output the compensation signal.

[0025] In addition, the comparison module 12 in this embodiment includes an electrically connected conversion circuit 121 and comparison circuit 122, where the conversion circuit 121 is electrically connected to the selection circuit 142 and the output circuit 11, and the comparison circuit 122 is electrically connected to the output power adjustment module 13 and the load-sharing busbar 2. When the selection circuit 142 does not output the compensation signal, i.e., outputs 0V, the conversion circuit 121 outputs the feedback signal to the comparison circuit 122, and the comparison circuit 122 outputs the adjustment signal based on the feedback signal and the sharing signal. When the selection circuit 142 outputs the compensation signal, the conversion circuit 121 receives the compensation signal and outputs a conversion signal to the comparison circuit 122 based on the compensation signal and the feedback signal, and the comparison circuit 122 outputs the adjustment signal based on the conversion signal and the sharing signal.

[0026] For example, the conversion circuit 121 may be a voltage adder circuit that adds the voltage of the feedback signal to the voltage output by the selection circuit 142 in the signal processing module 14. When the selection circuit 142 outputs 0V, the voltage output by the conversion circuit 121 is equal to the voltage of the feedback signal. This allows the conversion circuit 121 to output the feedback signal to the comparison circuit 122. The comparison circuit 122 may be a comparator circuit that compares the voltage of the feedback signal with the voltage of the shared signal to output the adjustment signal to adjust the output power. When the output power is stable, the voltage of the feedback signal is equal to the voltage of the shared signal.

[0027] When the selection circuit 142 in the signal processing module 14 outputs the compensation signal, the voltage of the conversion signal output by the conversion circuit 121 is the voltage of the feedback signal plus the voltage of the compensation signal, that is, the voltage of the conversion signal is greater than the voltage of the feedback signal. The comparison circuit 122 compares the voltage output by the conversion circuit 121 with the voltage of the shared signal and outputs the adjustment signal to reduce the output power. When the output power is stable, the voltage of the conversion signal becomes equal to the voltage of the shared signal.

[0028] The power supply method according to this embodiment can be implemented by the above-described power supply system 100. As shown in FIG.

[0029] In step S11, the control device 20 obtains the maximum power from each of the power supply devices 10.

[0030] In this embodiment, the microprocessor 141 in each of the signal processing modules 14 transmits the stored maximum power value to the control device 20 via the corresponding power management bus bar 30, thereby enabling the control device 20 to obtain the maximum power of the two power supply devices 10. Each of the signal processing modules 14 is electrically connected to an input detection circuit (not shown) and an output detection circuit (not shown). The input detection circuit is electrically connected to the AC power supply 3, and the output detection circuit is electrically connected to the output circuit 11. Each of the signal processing modules 14 then detects the input voltage information and the real-time output power value through the input detection circuit and the output detection circuit, respectively, and transmits the input voltage information and the real-time output power value to the control device 20.

[0031] For example, as shown in Table 1 below, if the maximum power of the first power supply device 10A is 1200W and the maximum power of the second power supply device 10B is 2000W, the output powers of the two power supply devices 10 and the corresponding proportions, voltages of the shared signal, output powers of the first power supply device 10A, and output powers of the second power supply device 10B are shown in Table 1.

[0032] Table 1 exemplarily shows the proportions corresponding to the output power for each 10% level difference, but the proportions corresponding to the output power may actually be for level differences smaller than 10%.

[0033] The first power supply 10A and the second power supply 10B each transmit their maximum power values ​​to the control device 20. The comparison module 12 in each power supply 10 has not yet received a compensation signal. Therefore, each power supply 10 outputs its output power based on the voltage of the received shared signal and the feedback signal, that is, outputs its output power proportional to the voltage of the shared signal. When the output power of each power supply 10 is stable, the voltage of the feedback signal becomes equal to the voltage of the shared signal. For example, if the shared signal is 4V, the output power of the first power supply 10A becomes 600W, the output power of the second power supply 10B becomes 1000W, and the feedback signal is also 4V.

[0034] Table 1. Data relating to the first and second power supply devices TIFF2025139527000002.tif96169

[0035] In step S12, if a control condition is met, the control device 20 outputs a control signal to the one of the at least two power supply devices 10 with the highest maximum power. The control condition includes a condition that the maximum power of the one of the at least two power supply devices 10 with the highest maximum power is greater than a predetermined maximum power and is also greater than the maximum power of the other power supply device 10. If the two power supply devices 10 do not meet the control condition, for example, if the two power supply devices 10 have the same maximum power, the control device 20 does not output the control signal to either power supply device 10.

[0036] In this embodiment, the predetermined maximum power may be preset in the control device 20. The predetermined maximum power may be set to, for example, 1000 W, which is the upper limit of safety regulations in the low-voltage range. However, it is not limited to this and may be set according to needs. When the control device 20 determines that the maximum power (2000 W) of the second power supply device 10B is greater than the predetermined maximum power (1000 W) and greater than the maximum power (1200 W) of the first power supply device 10A, the control device 20 transmits the control signal to the second power supply device 10B via the corresponding power management bus bar 30. Because the maximum power of the first power supply device 10A is relatively low, the control device 20 does not output the control signal to the first power supply device 10A.

[0037] In this embodiment, the control device 20 stores data relating to the first power supply device 10A and the second power supply device 10B shown in Table 1, and generates a compensation voltage value for adjusting the output power of the second power supply device 10B based on the data shown in Table 1. For example, if the output power of the first power supply device 10A is 600 W and the corresponding voltage value is 4 V, the control device 20 calculates the difference between the voltage value (2.4 V) of the second power supply device 10B's output power (1000 W) and the corresponding voltage value when the second power supply device 10B's output power is 600 W. In this case, the voltage difference is 4 V - 2.4 V = 1.6 V. The control device 20 then generates the compensation voltage value based on the difference value (1.6 V).

[0038] In step S13, the one of the at least two power supply devices 10 with the highest maximum power adjusts its output power based on the control signal so that the output powers of the at least two power supply devices 10 are equal or close to each other.

[0039] In this embodiment, when the microprocessor 141 of the signal processing module 14 in the second power supply device 10B receives a control signal, it controls the selection circuit 142 to generate the compensation signal according to the control signal, and the selection circuit 142 outputs the compensation signal to the conversion circuit 121 in the comparison module 12. The conversion circuit 121 outputs the conversion signal to the comparison circuit 122 according to the compensation signal and the feedback signal.

[0040] For example, the control signal sent by the control device 20 includes the compensation voltage value (e.g., 1.6V), and the microprocessor 141 controls the selection circuit 142 to generate a compensation signal based on the compensation voltage value in the control signal, and the voltage in the compensation signal is set as the compensation voltage value. In step S11, since the output power of the second power supply device 10B has stabilized, the voltage of the feedback signal is equal to the voltage of the shared signal (4V). The conversion circuit 121 obtains the voltage of the conversion signal based on the voltage of the feedback signal and the voltage of the compensation signal, which is 5.6V (i.e., 4V + 1.6V).

[0041] The comparison circuit 122 compares the voltage (5.6V) output by the conversion circuit 121 with the voltage (4V) of the shared signal and outputs the corresponding adjustment signal to the output power adjustment module 13. Because the voltage output by the conversion circuit 121 is greater than the voltage of the shared signal, the output power adjustment module 13 adjusts the output power of the output circuit 11 based on the adjustment signal, thereby reducing the output power of the second power supply 10B. That is, the voltage of the feedback signal in the second power supply 10B also decreases, and the voltage of the conversion signal output by the conversion circuit 121 also decreases. The comparison circuit 122 stops outputting the voltage adjustment signal until the voltage of the conversion signal equals the voltage of the shared signal (4V), thereby maintaining the output power of the second power supply 10B stable. At this time, the voltage of the feedback signal equals 2.4V, and the output power of the second power supply 10B becomes 600W. That is, when the shared signal is 4V, if the first power supply 10A does not receive a control signal, it outputs an output power (600W) without adjusting its output power. On the other hand, if the second power supply 10B receives a control signal, it outputs an adjusted output power (600W). This achieves the goal of making the output power of the two power supplies 10 equal or close to each other, and also extends the lifespan of the power supply with the highest maximum power, optimizing the reliability of the power supply system 100.

[0042] When the load 1 requires a higher power, the voltage of the shared signal increases, and the two power supplies 10 increase their combined output power, so that the output powers of both remain equal or close to each other. On the other hand, when the load 1 requires a lower power, the voltage of the shared signal decreases, and the two power supplies 10 decrease their combined output power, so that the output powers of both remain equal or close to each other.

[0043] The power supply method according to the first embodiment described above can be applied whether the input voltage of the AC power source 3 to which the two power supply devices 10 are connected is in the high voltage range or the low voltage range.

[0044] For example, in the low voltage range, the output power of the second power supply device 10B has already been adjusted low, and if the adjusted output power of the second power supply device 10B has already reached or approached the upper limit of the safety regulations, the sum of the output power of the two power supplies 10 will reach 1920W (960W+960W), thereby achieving the goal of maximizing the sum of the output power of the power supply system 100. If the second power supply device 10B is not adjusted, the sum of the output power of the two power supplies 10 will be 1600W (600W+1000W).

[0045] The power supply system and method according to a second preferred embodiment of the present invention further adjusts the output power of the one of the at least two power supply devices 10 with the highest maximum power when it is in a low voltage range in combination with an AC power source 3. The input voltage of the AC power source 3 to which the two power supply devices 10 are connected is in the low voltage range. The power supply system and method according to this embodiment are almost the same as those of the first embodiment, except that the control conditions are different. More specifically, the control conditions include the following first and second conditions: The first condition is that the input voltage information of the power supply device 10 with the highest maximum power falls within the low voltage range. The second condition is that the maximum power of the one of the at least two power supply devices 10 having the highest maximum power is greater than a predetermined maximum power and is also greater than the maximum power of the other power supply device 10.

[0046] Therefore, the power supply method according to this embodiment can also achieve the objective of maximizing the total output power of the power supply system when the input voltage falls within the low voltage range.

[0047] FIG. 5 shows a power supply 10' according to a third preferred embodiment of the present invention, which has a configuration similar to that of the first embodiment, but differs in the following respects. In this embodiment, the microprocessor 141' in each signal processing module 14' has an analog voltage output means 141B, which allows the microprocessor 141' to output voltages with different values ​​to form the compensation signal. Alternatively, if the microprocessor 141' outputs 0V, the compensation signal is not output. Therefore, the selection circuit 142 may be omitted for each signal processing module 14'. The microprocessor 141' is electrically connected directly to the conversion circuit 121. When the microprocessor 141' with the highest maximum power of the at least two power supplies 10' receives the control signal, the microprocessor 141' outputs the compensation signal based on the control signal, which can also achieve the effect of making the output powers of the at least two power supplies 10' equal or close to each other.

[0048] Similarly, the power supply device 10' according to this embodiment may be used in combination with the power supply method according to the second embodiment.

[0049] In the first and second embodiments, when the power supply system includes three or more power supply devices, the second control condition of the first embodiment or the second control condition of the second embodiment is that the maximum power of the power supply device with the highest maximum power is greater than a predetermined maximum power and greater than the maximum power of the power supply device with the lowest maximum power. The control signal is output to the power supply device with the highest maximum power, and the power supply device with the highest maximum power adjusts its output power so that the output powers of the power supply devices with the highest and lowest maximum powers are equal to or close to each other.

[0050] The above description is merely a preferred embodiment of the present invention, and any equivalent replacements obtained by applying the patent scope together with the specification of the present invention should be included in the patent scope of the present invention. [Explanation of symbols]

[0051] 100 Power Supply System 10, 10' power supply 10A first power supply device 10B Second power supply device 11 Output circuit 12 Comparison Module 121 Conversion circuit 122 Comparison circuit 13 Output Power Adjustment Module 14, 14' signal processing module 141, 141' microprocessor 141A Memory 141B Analog voltage output means 142 selection circuit 142A operational amplifier 142A1 Output end 20 Control device 30 Power Management Busbar 1 Load 2 Load-sharing busbars 3 AC power supply R1, R2, R3, R4 resistance

Claims

1. 1. A power supply system used to supply power to a load and connected to a load sharing busbar, comprising: The power supply system includes at least two power supply devices and a control device; The at least two power supply devices are connected in parallel to the load, each of the power supply devices has a maximum power and outputs an output power to the load that is less than or equal to the maximum power, and each of the power supply devices receives a sharing signal from the load sharing busbar and adjusts its output power based on the sharing signal; the control device is electrically connected to the at least two power supply devices, and obtains the maximum power from each of the power supply devices; and when a control condition is met, outputs a control signal to the at least two power supply devices with the highest maximum power, and the at least two power supply devices with the highest maximum power adjusts its output power so that the output powers of the at least two power supply devices are equal or close to each other; a power supply system characterized in that the control conditions include a condition that the maximum power of the power supply device having the highest maximum power among the at least two power supply devices is greater than a predetermined maximum power and is also greater than the maximum power of the other power supply devices.

2. The at least two power supply devices are electrically connected to an AC power source, and each of the power supply devices transmits input voltage information of the corresponding AC power source to the control device; 2. The power supply system according to claim 1, wherein the control conditions further include a condition that the input voltage information of the power supply device having the highest maximum power falls within a low voltage range.

3. the power supply device includes an output circuit, a comparison module, an output power adjustment module, and a signal processing module, the output circuit is connected to the load and outputs a feedback signal, the comparison module is electrically connected to the load sharing busbar, the output circuit, and the output power adjustment module, the signal processing module is electrically connected to the control device and the comparison module, and the comparison module outputs an adjustment signal to the output power adjustment module based on the sharing signal and the feedback signal to adjust the output power; 2. The power supply system of claim 1, wherein when the signal processing module of the power supply device with the highest maximum power receives the control signal, the signal processing module outputs a compensation signal to the comparison module, and the comparison module outputs the adjustment signal to the output power adjustment module based on the shared signal, the feedback signal, and the compensation signal.

4. The comparison module in each of the power supply devices includes a conversion circuit and a comparison circuit, the conversion circuit receives the feedback signal and outputs the feedback signal to the comparison circuit, and the comparison circuit outputs the adjustment signal according to the feedback signal and the shared signal; 4. The power supply system of claim 3, wherein when the signal processing module of the power supply device with the highest maximum power outputs the compensation signal, the corresponding conversion circuit receives the compensation signal and outputs a conversion signal to the comparison circuit based on the compensation signal and the feedback signal, and the comparison circuit outputs the adjustment signal based on the conversion signal and the shared signal.

5. Each of the signal processing modules includes a microprocessor and a selection circuit, the microprocessor is electrically connected to the control device and the selection circuit, and the selection circuit is electrically connected to the conversion circuit; 5. The power supply system of claim 4, wherein when the microprocessor receives the control signal from the power supply device having the highest maximum power among the at least two power supply devices, the microprocessor controls the selection circuit to output the compensation signal based on the control signal.

6. each said signal processing module includes a microprocessor electrically connected to said conversion circuit; 5. The power supply system of claim 4, wherein when the microprocessor of the power supply device having the highest maximum power receives the control signal, the microprocessor outputs the compensation signal based on the control signal.

7. A power supply method applied to a power supply system including at least two power supply devices and a control device, wherein the at least two power supply devices are connected in parallel to a load, each of the power supply devices has a maximum power, and outputs an output power to the load that is less than or equal to the maximum power, each of the power supply devices receives a shared signal from a load-sharing busbar and adjusts its output power based on the shared signal; The power supply method includes: the control device obtaining the maximum power from each of the power supplies; and the control device includes a step of outputting a control signal to one of the at least two power supply devices having the highest maximum power when a control condition is met; the control condition includes a condition that the maximum power of the one of the at least two power supply devices having the highest maximum power is greater than a predetermined maximum power and is also greater than the maximum power of the other of the power supply devices; a power supply method comprising: adjusting an output power of the at least two power supply devices having the highest maximum power based on the control signal so that the output powers of the at least two power supply devices are equal or close to each other.

8. The at least two power supply devices are electrically connected to an AC power source; the power supply method includes each of the power supply devices transmitting input voltage information of the corresponding AC power source to the control device; The power supply method of claim 7 , wherein the control conditions further include a condition that the input voltage information of the one of the at least two power supply devices having the highest maximum power falls within a low voltage range.

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