Power supply system and its power supply control method

Abstract

This invention discloses a power supply system and its power supply control method. The power supply system includes multiple power modules that supply power to a load. Each power module provides an output current based on a modulation signal and provides the output current to a power bus through its output terminal, thereby supplying power to the load via the power bus. Each power module shares a common connection point on the signal bus to generate a second potential. A first ratio is obtained based on the full-load output power of its own conversion circuit and the full-load output power of the power module capable of outputting the maximum power. The first potential is adjusted based on the first ratio and the second potential, thereby adjusting the output current to a target value corresponding to the first ratio.

Description

Technical Field

[0001] This invention relates to a power supply system and its power supply control method, and more particularly to a power supply system and its power supply control method suitable for asymmetrical power parallel connection. Background Technology

[0002] With the increasing prevalence of data networking, more and more data needs to be stored using devices such as servers. As servers are critical loads and must operate without interruption of power, the power supply to servers must be uninterrupted and able to meet the needs of load shedding at any time. Therefore, the design of server power supply systems is receiving increasing attention.

[0003] Currently, power modules used in server systems must meet the M+N redundancy parallel function. The basic requirements for power modules are identical input potential, identical output potential, and identical total output power to provide a parallel current-sharing power supply mode. Furthermore, in the event of a failure in one group of power modules, the remaining power modules must still be able to meet the load requirements. Power modules certified for use in server systems are typically designed and manufactured by more than one power supply supplier. Early parallel power module usage rules were not complex. This was because the operating environment and dynamic response requirements were not high, so the primary considerations were current sharing and accuracy, which were emphasized in parallel technology at the time. Under these considerations, parallel systems were simple and direct, only accepting power modules of the same level and specifications connected in parallel, limiting the flexibility of server power supply system design. Therefore, under these circumstances, power modules must be recognized by the user system, including: 1. Power module serial number (S / N). 2. Field-replaceable backup unit (FRU) of the power module. 3. Power module identification (ID). When a server system uses two or more power supply modules, the system BIOS will read and interpret the above three pieces of information. If these three sets of information differ from the original settings, the system will issue a warning and will not provide power for startup.

[0004] However, since servers typically require a large number of power supply modules, it is difficult to configure power supply modules with identical specifications for server power supply systems under certain special conditions. Therefore, how to design a power supply system and its power control method to change the traditional limitation of only allowing parallel connection of models with the same output power, and to provide maximum parallel power, thereby increasing the number of power supply module options and the efficiency of parallel systems for server systems, is a major research topic that the creators of this project intend to undertake. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a power supply system suitable for asymmetric power parallel connection, overcoming the limitations of existing technologies. Therefore, the power supply system of this invention includes multiple power modules supplying power to a load, and each power module includes a conversion circuit, a current sensing unit, a signal amplification unit, a current sharing unit, and a controller. The conversion circuit provides an output current based on a modulation signal and supplies the output current to a power bus via its output terminal, thereby supplying power to the load through the power bus. The current sensing unit is coupled to the output terminal and senses the output current to generate a first potential. The signal amplification unit is coupled to the current sensing unit and provides an amplified signal based on the first potential. The current sharing unit is coupled to the signal amplification unit and receives the amplified signal. The controller is coupled to the current sensing unit, the signal amplification unit, and the current sharing unit, and adjusts the modulation signal based on the amplified signal. In this configuration, the current sharing unit of each power module is connected to a common connection point on the signal bus to generate a second potential at the common connection point. The controller obtains a first ratio based on the full-load output power of its own conversion circuit and the full-load output power of the power module that can output the maximum power. Based on the first ratio and the second potential, the controller adjusts the first potential to adjust the amplified signal and adjust the output current to the target value corresponding to the first ratio.

[0006] In one embodiment, the second potential is the average of the amplified signals of each power module.

[0007] In one embodiment, the current sharing unit includes a buffer and a resistor. The buffer is coupled to the signal amplification unit, and the resistor is coupled to the buffer and a common contact. The second potential is the voltage across the resistor.

[0008] In one embodiment, the second ratio of the output current of each power module is equal to the first ratio of each power module.

[0009] In one embodiment, the controller sets the maximum value of the first potential to a fixed value, which corresponds to the first potential of the power modules at full load output, where the maximum of the full load output power is at full load.

[0010] In one embodiment, the output voltage of the conversion circuit responds to the output current, and the controller adjusts the modulation signal based on the output voltage and the amplified signal.

[0011] In one embodiment, when the power module with the highest full-load output power fails, the power supply system still meets the full-load load requirement.

[0012] To address the aforementioned problems, this invention provides a power supply control method suitable for a power supply system with asymmetrical power parallel connection, overcoming the limitations of existing technologies. Therefore, the power supply control method of this invention controls multiple power modules to supply power to a load, and the method includes the following steps: (a) controlling the conversion circuit of each power module to provide output current based on a modulation signal. (b) sensing the output current to generate a first potential, and providing an amplified signal based on the first potential. (c) adjusting the modulation signal based on the amplified signal, and generating a second potential by summing and averaging the amplified signals of each power module. (d) obtaining a first ratio for each power module based on the full-load output power of its own conversion circuit and the full-load output power of the power module capable of outputting the maximum power. (e) adjusting the first potential based on the first ratio and the second potential, thereby adjusting the amplified signal and adjusting the output current to a target value.

[0013] In one embodiment, the method further includes the following steps: (f) taking the maximum full-load output power of the power modules and setting a fixed value of the first potential at full-load output. (g) setting the maximum value of the first potential of the remaining power modules to the fixed value.

[0014] In one embodiment, the method further includes the following steps: (h) detecting the output voltage of each power module respectively; and (i) adjusting the modulation signal based on the output voltage and the amplified signal respectively.

[0015] The main objective and effect of this invention is that each power module in the power supply system of this invention can obtain a corresponding ratio of full-load output power based on the full-load output power of its own conversion circuit and the full-load output power of the power module that can output the maximum power. In order to adjust the output current required by each power module according to the ratio of the full-load output power of the power modules, the output current required by each power module is distributed proportionally according to the full-load power of each power module.

[0016] To gain a deeper understanding of the techniques, means, and effects employed by this invention to achieve its intended purpose, please refer to the following detailed description and accompanying drawings. It is believed that the purpose, features, and characteristics of this invention can be understood in a thorough and specific manner from these drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit the scope of this invention. Attached Figure Description

[0017] Figure 1 This is a circuit block diagram of a power supply system applicable to asymmetric power parallel connection according to the present invention;

[0018] Figure 2 This is a circuit block diagram of the signal processing unit of the present invention;

[0019] Figure 3 This is a detailed circuit block diagram of the signal processing unit of the present invention;

[0020] Figure 4 This is a schematic diagram showing the parallel connection of 650W and 1200W power modules in the power supply system of this invention; and

[0021] Figure 5 This is a flowchart of the power supply control method of the power supply system of the present invention.

[0022] In the attached figures, the following labels are used:

[0023] 100… power supply system

[0024] 1~1N… Power Module

[0025] 1A…output terminal

[0026] 10…Conversion Circuit

[0027] 12…Signal Processing Unit

[0028] 122… Current sensing unit

[0029] Rs…current sensing resistor

[0030] 124… Signal Amplification Unit

[0031] 126…flow sharing unit

[0032] 126A… buffer

[0033] R…resistance

[0034] 14… Controller

[0035] 2…Power Bus

[0036] 3…signal bus

[0037] 200…load

[0038] 300…System Processing Unit

[0039] Vin…Input Voltage

[0040] Vo…output voltage

[0041] Io…output current

[0042] It…total current demand

[0043] PWM...modulation signal

[0044] Sa…Amplified signal

[0045] V1…First Potential

[0046] V2…Second potential

[0047] (S100)~(S180)…Steps Detailed Implementation

[0048] The technical content and detailed description of the present invention are explained below with reference to the accompanying drawings:

[0049] Please see Figure 1 This is a circuit block diagram of a power supply system applicable to asymmetric parallel power supply according to the present invention. The power supply system 100 includes multiple power modules 1 to 1N (two are shown in this embodiment), a power bus 2, and a signal bus 3. Power modules 1 to 1N are coupled to a load 200 via the power bus 2 and to a system processing unit 300 (e.g., but not limited to, a central processing unit, microcontroller, digital signal processor, etc.) via the signal bus 3. Power modules 1 to 1N provide an output voltage Vo via the power bus 2 and provide an output current Io in response to the load withdrawal of the load 200. The system processing unit 300 communicates with each power module 1 to 1N via the signal bus 3 and allocates the power output required by each power module 1 to 1N based on the needs of the load 200 and the capabilities of each power module 1 to 1N to maintain the stable operation of the load 200. Each power module 1 to 1N can also share its operating status via the signal bus 3 to adaptively adjust its output.

[0050] Specifically, load 200 can be a critical load (e.g., but not limited to servers, switches, base station equipment, etc.), and the power supply system 100 is mainly a redundant power supply system (i.e., an M+N redundant parallel power supply system) to provide uninterrupted power supply for the critical load. The total required current It is the sum of the output currents Io of all power modules 1 to 1N. When all power modules 1 to 1N are functioning normally, the system processing unit 300 outputs power proportionally according to the full-load power of each power module 1 to 1N, thus proportionally distributing the total required current It of load 200 (e.g., but not limited to 1000W power modules and 500W power modules both operating at half-load). Each power module 1 to 1N can also operate under high conversion efficiency output conditions. When one power module 1 to 1N fails, the remaining power modules 1 to 1N can immediately take over its operation to avoid the risk of being unable to meet the operational needs of load 200.

[0051] See also Figure 1Each power module 1-1N includes a conversion circuit 10, a signal processing unit 12, and a controller 14. The conversion circuit 10 receives an input voltage Vin and converts it into an output voltage Vo based on a PWM modulation signal, providing the output voltage Vo and output current Io to the output terminal 1A of each power module 1-1N. The output terminal 1A of each power module 1-1N is coupled to a power bus 2, and the output voltage Vo and output current Io of each power module 1-1N can be provided to the power bus 2 through the output terminal 1A to supply power to the load 200 and maintain the stable operation of the load 200. The magnitude of the output current Io is determined based on the load 200's drawdown (i.e., the total current demand It) and the power supply system 100's distribution, typically maintaining a proportional distribution across each power module 1-1N. The signal processing unit 12 is coupled to a signal bus 3, and the controller 14 is coupled to the conversion circuit 10 and the signal processing unit 12. The signal processing unit 12 communicates with the system processing unit 300 via the signal bus 3, and shares information with the power modules 1 to 1N via the signal bus 3. The conversion circuit 10 can be a switching isolated / non-isolated power converter (e.g., but not limited to flyback converters), and the controller 14 can be, for example, but not limited to, a central processing unit, microcontroller, digital signal processor, or other computing device.

[0052] The controller 14 receives the command from the system processing unit 300 through the signal processing unit 12 and transmits its own information for the system processing unit 300 to refer to or make judgments for subsequent control. The controller 14 also shares information with other power modules 1-1N through the signal processing unit 12, enabling each power module 1-1N to know the status of others and adaptively adjust its own output. Furthermore, the controller 14 mainly provides a PWM control conversion circuit 10 to convert the output voltage Vo and output current Io. The controller 14 adjusts the PWM signal through signal feedback from the output terminal 1A and the signal provided by the signal processing unit 12, thereby adjusting the output voltage Vo and output current Io output by the conversion circuit 10.

[0053] Please see Figure 2 This is a circuit block diagram of the signal processing unit of the present invention, which can be further referenced. Figure 1The signal processing unit 12 includes a current sensing unit 122, a signal amplification unit 124, and a current sharing unit 126. The input terminal of the current sensing unit 122 is coupled to the output terminal 1A to sense the output current Io and generate a first potential V1. The output terminal of the current sensing unit 122 can be coupled to the controller 14 so that the controller 14 can determine the magnitude of the output current Io by receiving the first potential V1. It should be further noted that the output terminal of the current sensing unit 122 can also be coupled to the system processing unit 300 and the other power modules 1 to 1N through the signal bus 3 to share the first potential V1 for the system processing unit 300 or the other power modules 1 to 1N to read.

[0054] The signal amplification unit 124 is coupled to the output of the current sensing unit 122 and provides an amplified signal Sa based on the first potential V1. The signal amplification unit 124 modulates (amplifies) the first potential V1 into an amplified signal Sa according to the signal level required by the power supply system 100. The amplified signal Sa also corresponds to the magnitude of the output current Io. The output of the signal amplification unit 124 can also be coupled to the controller 14 to provide the amplified signal Sa. The controller 14 further uses the amplified signal Sa and the signal corresponding to the simultaneously intercepted output voltage Vo to perform pulse modulation through the pulse width modulation module (not shown) of the controller 14 to adjust the modulation signal PWM. It should be further noted that the output of the signal amplification unit 124 can also be coupled to the signal bus 3 to provide the amplified signal Sa to the system processing unit 300 or other power modules 1-1N, so that the amplified signal Sa can be shared for interpretation by the system processing unit 300 or other power modules 1-1N. Furthermore, since the adjustment of the output voltage Vo affects the magnitude of the output current Io (i.e., the output voltage Vo responds to the output current Io), the controller 14 can adjust the modulation signal PWM based on the output voltage Vo and the amplification signal Sa, so as to control the output current Io by adjusting the output voltage Vo to meet the requirements of proportional distribution of each power supply module 1 to 1N.

[0055] The input terminal of the current sharing unit 126 is coupled to the signal amplification unit 122 and receives the amplified signal Sa. The output terminal of the current sharing unit 126 is coupled to the signal bus 3 and the controller 14, and generates a second potential V2 at the output terminal. Specifically, the output terminals of the current sharing units 126 of each power module 1 to 1N are all connected to a common connection point on the signal bus 3, so that the second potential V2 at this common connection point is the averaged potential, specifically the value generated by averaging the signals output by each current sharing unit 126. Generally, the controller 14 adjusts the first potential V1 based on the averaged second potential V2, thereby adjusting the amplified signal Sa by adjusting the first potential V1. Therefore, the controller 14 can adjust the output current Io based on the adjusted amplified signal Sa and the corresponding signal of the output voltage Vo.

[0056] The main objective and effect of this invention is that the controller 14 can obtain a first ratio based on the full-load output power of its own conversion circuit 10 and the full-load output power of the power modules 1-1N with the maximum output power. This ratio represents the proportional relationship between the full-load output power of the power modules 1-1N and the maximum-power power modules 1-1N. In addition to adjusting the first potential V1 based on the second potential V2 to evenly distribute the output current Io, the controller 14 further adjusts the required share of the output current Io according to the proportional relationship of the full-load output power of the power modules 1-1N to achieve a proportional output relationship. Specifically, in addition to adjusting the first potential V1 based on the second potential V2, the controller 14 further adjusts the first potential V1 based on the first ratio corresponding to the full-load output power, so that the power supply system 100 can asymmetrically provide the output current Io according to the different full-load output power. Therefore, the power supply system 100 can achieve a proportional adjustment of the output current Io of each power module 1-1N, instead of adjusting the output current Io of each power module 1-1N in an evenly distributed manner as in the prior art.

[0057] The controller 14 has multiple methods to determine the full-load output power of power modules 1 to 1N and their corresponding first ratio. For example, but not limited to, the system processing unit 300 can communicate with the controller 14 of each power module 1 to 1N to determine the full-load output power that each power module 1 to 1N can provide and its corresponding first ratio. Alternatively, the controllers 14 of each power module 1 to 1N can communicate with each other to determine their respective full-load output power and their corresponding first ratio. Furthermore, a load test can be performed during startup to determine the full-load output power by detecting the output voltage Vo and the output current Io.

[0058] Please see Figure 3 This is a detailed circuit block diagram of the signal processing unit of the present invention, which can be further referenced. Figures 1-2 In one embodiment of the present invention, Figure 2 The signal processing unit 12 shown can be implemented by firmware or software programs inside the controller 14, but it can also be implemented using circuits composed of electronic components. Figure 3 An embodiment of the signal processing unit 12 configured as a circuit is presented. The current sensing unit 122 uses a current sensing circuit, with the output terminal 1A coupled to a current sensing resistor Rs, and both ends of the sensing resistor Rs coupled to an error amplifier to generate a first potential V1 corresponding to the magnitude of the output current Io. Alternatively, the current sensing unit 122 can be replaced by a current sensor or other device for sensing current.

[0059] The signal amplification unit 124 can be implemented by a forward or reverse amplification circuit composed of operational amplifiers to modulate (amplify) the first potential V1 into an amplified signal Sa. The forward or reverse amplification of the circuit depends primarily on the requirements of the back-end (e.g., controller 14 or system processing unit 300), based on the type of signal it can accept. The current sharing unit 126 can be a voltage follower circuit composed of operational amplifiers, providing the amplified signal Sa to the input of the current sharing unit 126 and isolating the input and output. Specifically, the current sharing unit 126 may include a buffer 126A composed of operational amplifiers and a resistor R. The buffer 126A is coupled to the signal amplification unit 124, and the resistor R is coupled to the common connection point of the buffer 126A and the signal bus 3. Since each current sharing unit 126 of power modules 1 to 1N includes a resistor R, and the resistor R is coupled to the common junction of the signal bus 3, the amplified signals Sa provided by each power module 1 to 1N will be summed and averaged at the common junction, forming a voltage across the resistor R. This voltage across the resistor R is the second potential V2. It is worth noting that in one embodiment of the present invention, any circuit / component with isolated input / output terminals and capable of transmitting signals to the output terminal (e.g., but not limited to, optocoupler circuits, buffer gates, etc., and including those with scaling functions) can be used as buffer 126A. It is also worth noting that in one embodiment of the present invention, a buffer may be included between the current sensing unit 122 and the signal amplification unit 124 to isolate the actual value of the first potential V1 detected by the current sensing unit 122 from the first potential V1 adjusted by the controller 14, thus preventing the first potential V1 received by the signal amplification unit 124 from being affected by fluctuations in analog detection and thus becoming inaccurate.

[0060] See also Figures 1-3Taking two power modules 1 to 1N with different full-load power connected in parallel as an example, if one of them has a full-load power of 1000W and the other has a full-load power of 500W, the controllers 14 of the two modules first know their respective full-load power and their corresponding first ratio (i.e., 2:1). The 1000W power module sets the maximum value of the first potential V1 to a fixed value (assumed to be 4V) at full-load output (100%), and the 500W power module also sets the maximum value of the first potential V1 to a fixed value corresponding to the full-load output power of the 1000W power module (i.e., although the wattage is only half that of 1000W, and the maximum value is only 2V, the controller 14 still sets the maximum value of the first potential V1 to 4V). Therefore, when the power supply system 100 starts to supply power to the load 200, the 500W controller 14 will convert the first potential V1 to be the same as that of the 1000W according to the proportional relationship (i.e., the first ratio). For example, but not limited to, assuming the first potential V1 measured by the 500W current sensing unit 122 is 1V (representing 500W output at half load), the 500W controller 14 converts the 1V first potential V1 to 2V proportionally. This allows the 1000W and 500W power modules to synchronize to the same power level due to the proportional conversion of the first potential V1. Therefore, the second potential V2 of the 1000W and 500W power modules at the common junction will also reach the same power level due to the proportional conversion of the first potential V1, and the average value will be obtained by summing the values ​​at the common junction. Assuming the amplified signal Sa of the 1000W represents 60% load and the amplified signal Sa of the 500W represents 40% load, the second potential V2 at the common junction will represent the average potential (i.e., 50% load). The controllers 14 for 1000W and 500W then adjust the first potential V1 (i.e., adjust the values ​​corresponding to 60% and 40% to 50%) based on the second potential V2. This adjustment of the first potential V1 adjusts the amplified signal Sa, and the adjusted amplified signal Sa controls the output current Io provided by its respective conversion circuit 10. Therefore, the power supply system 100 can draw a 2:1 ratio of output current Io from the two power modules (1000W and 500W). Thus, the second ratio (2:1) of the output current Io from the 1000W and 500W power modules is equal to the first ratio (2:1). In other words, the load 200 can draw an asymmetrical and uneven output current Io from the power supply system 100 without needing to standardize the specifications of all power modules.

[0061] On the other hand, if two power modules 1 to 1N with the same full-load power are connected in parallel, the maximum value of their first potential V1 is already the same. Therefore, the two power modules 1 to 1N with the same full-load power can also be controlled using the circuit architecture of this invention using the traditional average current method. It is worth mentioning that since the power supply system 100 of this invention focuses on an M+N redundant parallel power supply system, regardless of which group of power modules 1 to 1N fails, the remaining power modules 1 to 1N can immediately take over its operation. Therefore, even when the full-load power is different, the power supply system 100 is configured such that when the power module with the largest full-load output power of the power modules 1 to 1N fails (assuming it is 1000W), the power supply system 100 still meets the full-load requirement of the load 200, in accordance with the requirements of an M+N redundant parallel power supply system.

[0062] It should be further explained that conventional power supply systems cannot draw asymmetrical and uneven output current Io to accommodate the different full-load output power of power modules 1 to 1N. Therefore, when the full-load output power of power modules 1 to 1N differs, the first potential V1 is not adjusted based on the first ratio. As a result, when a 1000W power module draws 50% of its output current Io, a 500W power module, with only half the full-load output power of the 1000W module, is forced to draw 100% of its output current Io. This fails to meet the requirement of power supply system 100 to draw the output current Io proportionally based on the different full-load output power.

[0063] Please see Figure 4 This is a schematic diagram illustrating the parallel connection of 650W and 1200W power modules in the power supply system of this invention. Using the values ​​marked in the first column (100%) and the sixth column (50%), when the total current demand It of the extracted load 200 is 154 (A) amperes, the output currents Io of the 650W and 1200W power modules are 55.4A (650W) and 99.3A (1200W), respectively. The total is close to the demand of 154 (A) amperes, with errors of 2.39% and 0.59%, respectively. The results still have a considerable margin (+ / -3%) compared to the original specification requirement of + / -5%, indicating that the design meets the parallel current sharing specifications of the power supply system 100. On the other hand, when the total current It required by the load 200 is 77 (A) amperes, the output current Io of the 650W and 1200W power modules is 26.2A (650W) and 50.4A (1200W), respectively, which is close to the required 77 (A) amperes. The error values ​​are 3.16% and 0.91% respectively. The result still has a considerable margin (+ / -2%) compared with the original specification requirement of + / -5%. It can be seen that the design meets the parallel current sharing specification of the power supply system 100.

[0064] However, existing power supply systems lack a control method for tapping asymmetrical and uneven output current Io. At 100% load, the load 200 tapping the 650W power module may cause overload, potentially leading to module failure and system instability. At 50% load, the load 200 tapping the 650W and 1200W power modules is only evenly distributed based on the number of modules, resulting in the 650W module being tapped more than half-load (approximately 70%), while the 1200W module is tapped less than half-load (approximately 40%). This fails to achieve the goal of proportionally tapping 1-1N of output current Io from each power module based on their full-load power (1-1N).

[0065] Please see Figure 5 This is a flowchart of the power supply control method of the power supply system of the present invention, which can be referred to in conjunction with the above. Figures 1-4 The power supply control method of the power supply system 100 of the present invention is mainly based on the different full-load output power of the power supply system 100, proportionally extracting the output current Io of multiple power modules 1 to 1N, and the method flow is as follows: The conversion circuit of each power module is controlled to provide output current based on a modulation signal (S100). Each power module 1 to 1N includes a conversion circuit 10, and the conversion circuit 10 converts the input voltage Vin into an output voltage Vo based on the modulation signal PWM, so as to provide the output voltage Vo and the output current Io to the output terminal 1A of the power module 1 to 1N. Then, the output current is sensed to generate a first potential, and an amplified signal is provided based on the first potential (S120). In a preferred embodiment, the output current Io is sensed by the current sensing unit 122 to generate a first potential V1, and the first potential V1 is modulated (amplified) into an amplified signal Sa corresponding to the magnitude of the output current Io by the signal amplification unit 124.

[0066] Then, the modulation signal is adjusted based on the amplified signal, and a second potential is generated by summing and averaging the amplified signals of each power module (S140). In a preferred embodiment, the controller 14 adjusts the modulation signal PWM by performing pulse width modulation (PWM) on the signal corresponding to the amplified signal Sa and the output voltage Vo intercepted at the same time, and the current sharing units 126 of each power module 1 to 1N are connected at a common connection point to generate a second potential V2 based on the summing and averaging of the amplified signal Sa. Then, each power module obtains a first ratio based on the full-load output power of its own conversion circuit and the full-load output power of the power module capable of outputting the maximum power (S160). In a preferred embodiment, the controller 14 obtains the full-load output power of power modules 1 to 1N by communicating with or detecting the system processing unit 300, and obtains the first ratio based on the full-load output power of its own conversion circuit 10 and the full-load output power of the power modules 1 to 1N capable of outputting the maximum power.

[0067] Finally, the first potential is adjusted based on the first ratio and the second potential, thereby adjusting the amplified signal and adjusting the output current to the target value corresponding to the first ratio (S180). In a preferred embodiment, the controller 14, in addition to adjusting the first potential V1 according to the second potential V2, further adjusts the first potential V1 based on the first ratio corresponding to the full-load output power, so that the maximum value of the first potential V1 of each power module 1 to 1N is converted proportionally and synchronized to the same power level, allowing the power supply system 100 to asymmetrically provide the output current Io according to the different full-load output power. It is worth mentioning that, in one embodiment of the present invention, the detailed steps of the above method flow can be referred to in conjunction with... Figures 2-3 This will not be elaborated upon further here.

[0068] However, the above description is only a detailed description and drawings of preferred embodiments of the present invention. The features of the present invention are not limited thereto and are not intended to limit the present invention. The scope of the present invention should be determined by the scope of the claims. All embodiments that are in line with the spirit of the claims of the present invention and similar variations thereof should be included in the scope of the present invention. Any variations or modifications that can be easily conceived by those skilled in the art within the field of the present invention can be covered by the following patent scope of this case.

[0069] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the claims of the present invention.

Claims

1. A power supply system, characterized in that, It includes multiple power supply modules that supply power to a load, and each power supply module includes: A conversion circuit provides an output current based on a modulation signal, and provides the output current to a power bus through an output terminal so as to supply the load through the power bus; A current sensing unit is coupled to the output terminal and senses the output current to generate a first potential; A signal amplification unit is coupled to the current sensing unit and provides an amplified signal based on the first potential; A current sharing unit is coupled to the signal amplification unit and receives the amplified signal; and A controller is coupled to the current sensing unit, the signal amplification unit and the current sharing unit, and adjusts the modulation signal based on the amplified signal; In this configuration, the current sharing unit of each power module is connected to a common connection point of a signal bus to generate a second potential at the common connection point. The controller obtains a first ratio based on the full-load output power of its own conversion circuit and the full-load output power of the power module that can output the maximum power. Based on the first ratio and the second potential, the controller adjusts the first potential to adjust the amplified signal and adjust the output current to a target value corresponding to the first ratio.

2. The power supply system according to claim 1, characterized in that, The second potential is the average of the amplified signals from each power module.

3. The power supply system according to claim 1, characterized in that, The current sharing unit includes: A buffer is coupled to the signal amplification unit; A resistor is connected to the buffer and the common contact point; The second potential is a voltage across the resistor.

4. The power supply system according to claim 1, characterized in that, A second ratio of the output current of each power module is equal to the first ratio of each power module.

5. The power supply system according to claim 1, characterized in that, The controller sets a maximum value of the first potential to a fixed value, which corresponds to the first potential at the maximum of the full-load output power of the power module at full load output.

6. The power supply system according to claim 1, characterized in that, The conversion circuit has an output voltage that responds to the output current, and the controller adjusts the modulation signal based on the output voltage and the amplified signal.

7. The power supply system according to claim 1, characterized in that, When the power module with the highest full-load output power fails, the power supply system still meets the full-load requirement of that load.

8. A power supply control method for a power supply system, characterized in that, Controlling multiple power modules to supply power to a load, and the power supply control method includes the following steps: A conversion circuit controlling each power module provides an output current based on a modulation signal; Each output current is sensed to generate a first potential, and an amplified signal is provided based on the first potential. The modulation signal is adjusted based on the amplified signal, and a second potential is generated by summing and averaging the amplified signals of each power module. Each power module obtains a first ratio based on the full-load output power of its own conversion circuit and the full-load output power of the power module that can output the maximum power. and The first potential is adjusted based on the first ratio and the second potential, so as to adjust the amplified signal by adjusting the first potential, and to adjust the output current to a target value by adjusting the amplified signal.

9. The power supply control method according to claim 8, characterized in that, It also includes the following steps: Take the maximum full-load output power of the power module as a fixed value of the first potential when it is at full-load output; and The maximum value of the first potential of the remaining power modules is set to this fixed value.

10. The power supply control method according to claim 8, characterized in that, It also includes the following steps: Detect the output voltage of each power module separately; and The modulation signal is adjusted based on the output voltage and the amplified signal, respectively.

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