Power supply circuit and power supply method

Abstract

The present application provides a power supply circuit and a power supply method. Among them, the power supply circuit includes multiple power supply groups connected in parallel with each other. Each power supply group includes multiple power supplies connected in series with each other, including a main power supply and multiple slave power supplies. The main power supply is configured to collect the supply currents of itself and the main power supplies of other power supply groups, and determine a first output voltage of the main power supply based on the average value of the supply currents. The slave power supplies are configured to collect the supply voltages of all the power supplies in the power supply group where they are located, and determine second output voltages of the slave power supplies in the power supply group based on the average value of the supply voltages. Through the above method, different power supply requirements can be met, the working efficiency of the power supplies can be improved, the circuit structure is simple, the output power of the power supplies can be balanced conveniently, quickly and effectively, the reliability and stability of the power supply circuit can be improved, and it is beneficial to reduce the production cost and maintenance cost.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and particularly to a power supply circuit and a power supply method. Background Art

[0002] A power supply can stably output a voltage or a direct current, and is widely used in fields such as power supply for electronic products, power supply for communication devices, power supply for industrial equipment operation, and electric vehicle charging.

[0003] In order to meet different power supply requirements and improve the working efficiency of the power supply, it is necessary to form a power supply circuit by combining multiple power supplies for power supply. A reliable and stable power supply circuit is crucial for the entire power system, and the existing power supply circuits still need to be improved. Summary of the Invention

[0004] The present application provides a power supply circuit and a power supply method, which can meet different power supply requirements, improve the working efficiency of the power supply, have a simple circuit structure, can conveniently, quickly and effectively balance the output power of the power supply, improve the reliability and stability of the power supply circuit, and are beneficial to reducing production costs and maintenance costs.

[0005] To solve the above technical problems, a first aspect of the present application provides a power supply circuit.

[0006] The power supply circuit includes multiple power supply groups connected in parallel with each other. Each power supply group includes multiple power supplies connected in series with each other, including a main power supply and multiple slave power supplies.

[0007] The main power supply is configured to collect the supply currents of itself and the main power supplies of other power supply groups, and determine a first output voltage of the main power supply based on the average value of the supply currents. The slave power supplies are configured to collect the supply voltages of all the power supplies in their respective power supply groups, and determine second output voltages of the slave power supplies in the power supply groups based on the average value of the supply voltages.

[0008] The power supply circuit further includes a communication bus, and each power supply is respectively connected to the communication bus. The main power supply obtains the supply current values of the main power supplies of other power supply groups through the communication bus. The slave power supplies obtain the supply voltage values of all the power supplies in their respective power supply groups through the communication bus.

[0009] The main power supply obtains a first voltage control value according to the current error value between its own supply current and the average value of the supply currents, and outputs the first output voltage according to the reference voltage value and the first voltage control value. The slave power supplies obtain a second voltage control value according to the voltage error value between their own supply currents and the average value of the supply currents, and output the second output voltages according to the reference voltage value and the second voltage control values.

[0010] Among them, the power supply receives the communication address value, determines the power supply group it belongs to according to the communication address value and the total number of power supply groups; the power supply receives the communication address values of all power supplies in its power supply group, determines the power supply with the smallest communication address value as the main power supply, and determines itself as the main power supply or the slave power supply.

[0011] Among them, the power supply circuit further includes a control module, and the control module is coupled to the power supply through a communication bus; the control module sends a control signal to the power supply through the communication bus, and the control signal includes a communication address value.

[0012] Among them, the control signal sent by the control module further includes a reference voltage value, and the reference voltage values of the main power supply and the slave power supply are the same.

[0013] Among them, the power supply includes a DIP switch, and the communication address value of the power supply is configured through the DIP switch.

[0014] To solve the above technical problems, the second aspect of the present application provides a power supply method for a power supply circuit. The power supply circuit includes multiple power supply groups connected in parallel with each other. Each power supply group includes multiple power supplies connected in series with each other, including a main power supply and multiple slave power supplies.

[0015] The power supply method includes: the main power supply collects the power supply currents of itself and the main power supplies of other power supply groups, and determines the first output voltage of the main power supply based on the average value of the power supply currents; the slave power supply collects the power supply voltages of all power supplies in its power supply group, and determines the second output voltage of each slave power supply in the power supply group based on the average value of the power supply voltages.

[0016] Among them, the step of determining the first output voltage of the main power supply based on the average value of the power supply currents includes: the main power supply obtains a first voltage control value according to the current error value between its own power supply current and the average value of the power supply currents, and outputs the first output voltage according to the reference voltage value and the first voltage control value; the step of determining the second output voltage of each slave power supply in the power supply group based on the average value of the power supply voltages includes: the slave power supply obtains a second voltage control value according to the voltage error value between its own power supply voltage and the average value of the power supply voltages, and outputs the second output voltage according to the reference voltage value and the second voltage control value.

[0017] Among them, before the step that the main power supply collects the power supply currents of itself and the main power supplies of other power supply groups: the power supply receives the communication address value; takes the remainder of the total number of power supply groups according to the communication address value to obtain the group number, and determines the power supply group it belongs to; the power supply receives the communication address values of all power supplies in its power supply group, determines the power supply with the smallest communication address value as the main power supply, and determines itself as the main power supply or the slave power supply.

[0018] Differing from the prior art, a power supply circuit and a power supply method provided in this application form a circuit structure of parallel - series hybrid, which can not only improve the power level of the power supply circuit, but also increase the voltage level of the power supply circuit, meet different power supply requirements, improve the working efficiency of the power supply, have a simple circuit structure, can conveniently and effectively balance the output power of the power supply, ensure that the load of the power supply is relatively balanced, can better withstand the working environment of high current and voltage, improve the reliability and stability of the power supply circuit, and is conducive to reducing production costs and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the circuit structure of an embodiment of the power supply circuit of this application;

[0020] Figure 2 is a schematic diagram of the communication structure of another embodiment of the power supply circuit of this application;

[0021] Figure 3 is a schematic diagram of the power supply structure of another embodiment of the power supply circuit of this application;

[0022] Figure 4 is a schematic diagram of the circuit structure of yet another embodiment of the power supply circuit of this application;

[0023] Figure 5 is a schematic flowchart of a method for supplying power to an embodiment of the power supply circuit of this application;

[0024] Figure 6 is a schematic flowchart of another embodiment of the method for supplying power to the power supply circuit of this application;

[0025] Figure 7 is a schematic flowchart of yet another embodiment of the method for supplying power to the power supply circuit of this application;

[0026] Figure 8 is Figure 7 a schematic flowchart of the main power supply and subordinate power supply distribution of another embodiment of the method for supplying power to the power supply circuit of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will describe the solutions of the embodiments of this application in detail with reference to the accompanying drawings of the specification.

[0028] Figure 1 , Figure 2 , Figure 3 , Figure 4 The schematic diagrams of the power supply circuit structures in [0000074], [0000075], [0000076] are circuit logic or communication logic diagrams, and the specific connection structures are for reference with the structures in actual production. In the following description, specific details such as specific system structures, interfaces, and technologies are proposed for the purpose of illustration rather than limitation, so as to understand this application thoroughly.

[0029] The present application first provides a power supply circuit. Among them, the power supply circuit of the present application forms a parallel - series hybrid circuit structure, which can not only improve the power level of the power supply circuit but also improve the voltage level of the power supply circuit, and can meet the application scenarios with different voltage and current requirements.

[0030] Please refer to Figure 1 , Figure 1 which is a schematic diagram of the circuit structure of an embodiment of the power supply circuit.

[0031] Among them, the power supply circuit 100 includes multiple power supply groups 101 connected in parallel with each other. Each power supply group 101 includes multiple power supply units 102 connected in series with each other, including a main power supply unit 1021 and multiple slave power supply units 1022.

[0032] In the present application, the power supply groups 101 of the power supply circuit 100 are connected to the power supply bus 1011 through an air switch or a bus - bar trunking system (not shown in the figure) to achieve mutual parallel connection. The power supply unit 102 closest to the power supply bus 1011 in each power supply group 101 is configured as the main power supply unit 1021. And the difference between the power supply unit 102 being configured as the main power supply unit 1021 or the slave power supply unit 1022 is only that the power supply unit 102 has different power supply schemes in the balance adjustment due to the circuit connection relationship. It can be understood that when the power supply circuit 100 is operating normally, the main power supply unit 1021 and the slave power supply units 1022 are simultaneously outputting voltage, and the output supply voltages are the same or similar and within the working range.

[0033] The power supply circuit 100 can be provided with two or more than three power supply groups 101. For example, it can be 2 groups, 3 groups, 4 groups, 5 groups, 8 groups, 9 groups or 10 groups; each power supply group 101 can be provided with two or more than three power supply units 102. For example, it can be 2, 3, 4, 5, 8, 9 or 10. It is necessary to ensure that the total number of power supply groups 101 is equal to the number of power supply units 102 in one power supply group 101 to form a power matrix, ensure that when each parallel power supply group 101 outputs voltage, the same number of power supply units 102 jointly bear the load, ensure that the load of each power supply unit 102 is relatively balanced, and increase the reliability and stability of the power supply circuit 100.

[0034] The power supply circuit 100 sets the reference voltage value of the output according to the application scenario or the working conditions of the load. However, since the internal resistances and output voltages of the power supply sources 102 that make up the power supply circuit may be different, which affects the load of the power supply. To prevent some power supply sources 102 from overheating or being damaged due to excessive current, it is necessary to collect the supply voltages of other power supply sources 102 among the power supply sources 102, continuously adjust their own supply voltages, and complete the overall balance adjustment of the power supply circuit, thereby improving the reliability and lifespan of the power supply circuit 100.

[0035] In this embodiment, the power supply circuit 100 forms a circuit structure of parallel - series hybrid. Different balance adjustments need to be carried out for the connection relationships between the power supply sources 102. Current sharing control is carried out between the power supply groups 101 that are connected in parallel, and voltage equalization control is carried out between the power supply sources 102 that are connected in series.

[0036] The main power supply source 1021 is configured to collect the supply current of its own and the main power supply sources 1021 of other power supply groups 101, and determine the first output voltage of the main power supply source 1021 based on the average value of the supply current.

[0037] To carry out current sharing control between the power supply groups 101 that are connected in parallel, each main power supply source 1021 sums up the supply currents of its own and the main power supply sources 1021 of other power supply groups 101, then divides by the total number of the power supply groups 101 to obtain the average value of the supply current, and continuously adjusts the supply voltage with the output being the first output voltage according to the average value of the supply current.

[0038] The slave power supply source 1022 is configured to collect the supply voltages of all the power supply sources 102 in its power supply group 101, and determine the second output voltage of each slave power supply source 1022 in the power supply group 101 based on the average value of the supply voltage.

[0039] To carry out voltage equalization control between the power supply sources 102 that are connected in series, each slave power supply source 1022 sums up the supply voltages of its own, the main power supply source 1021 and the slave power supply sources 1022 in its power supply group 101, then divides by the total number of the power supply sources 102 in the power supply group 101 to obtain the average value of the supply voltage, and continuously adjusts the supply voltage with the output being the second output voltage according to the average value of the supply voltage.

[0040] In a specific embodiment, the power supply circuit 100 further includes a communication bus (not shown in the figure), and each power supply source 102 is respectively connected to the communication bus; wherein, the main power supply source 1021 obtains the supply current value of the main power supply sources 1021 of other power supply groups 101 through the communication bus; the slave power supply source 1022 obtains the supply voltage values of all the power supply sources 102 in its power supply group 101 through the communication bus.

[0041] Each power supply 102 sends its own power supply voltage value and / or power supply current value through the communication bus, and collects the voltage value and / or power supply current value of other power supplies 102, and can respond to the power supply circuit 100 most quickly. Specifically, the power supply 102 sends the power supply voltage, power supply current and communication address value to the communication bus, and after receiving the information sent by other power supplies 102 and its own information, caches them into the array of storage elements of the power supply 102 in ascending order of the communication address value for equalization adjustment.

[0042] In other embodiments, each power supply 102 is connected with a measurement module, and the power supply voltage and / or power supply current of each power supply 102 are collected through the measurement module, and then the power supply voltage and / or power supply current of each power supply 102 are sent down through the communication bus; or each power supply 102 is connected with a control module through the communication bus, and the control module uniformly collects the power supply voltage value and / or power supply current value of each power supply 102 that sends each power supply 102, and after integrating the values, uniformly sends them to each power supply 102, and can monitor each power supply 102 of the power supply circuit 100 in time.

[0043] Please refer to Figure 2 , Figure 2 which is a schematic diagram of the communication structure of another embodiment of the power supply circuit of the present application. The circuit structure of another embodiment of the power supply circuit of the present application can refer to Figure 1 the schematic diagram of the circuit structure of an embodiment of the power supply circuit of the present application to assist in understanding.

[0044] Among them, the power supply circuit 100 includes multiple power supply groups 101 connected in parallel with each other. Each power supply group 101 includes multiple power supplies 102 connected in series with each other, including a main power supply 1021 and multiple slave power supplies 1022;

[0045] In the present application, the power supply groups 101 of the power supply circuit 100 are connected to the power supply bus 1011 through an air switch or a busbar trunking unit (not shown in the figure) to achieve parallel connection with each other. The power supply 102 closest to the power supply bus 1011 among the power supply groups 101 is configured as the main power supply 1021, and the difference between the power supply 102 configured as the main power supply 1021 or the slave power supply 1022 is only that the power supply 102 has different power supply schemes in the equalization adjustment due to the circuit connection relationship. It can be understood that when the power supply circuit 100 is working normally, the main power supply 1021 and the slave power supplies 1022 are simultaneously outputting voltage, and the output power supply voltages are the same or similar and within the working range.

[0046] The power supply circuit 100 can be provided with two or more power supply groups 101. For example, it can be 2 groups, 3 groups, 4 groups, 5 groups, 8 groups, 9 groups or 10 groups. Each power supply group 101 can be provided with two or more power supply sources 102. For example, it can be 2, 3, 4, 5, 8, 9 or 10. It is necessary to ensure that the total number of power supply groups 101 is equal to the number of power supply sources 102 in one power supply group 101 to form a power supply matrix. When each parallel power supply group 101 outputs voltage, the same number of power supply sources 102 share the load together, ensuring that the load of each power supply source 102 is relatively balanced, and increasing the reliability and stability of the power supply circuit 100.

[0047] The power supply circuit 100 sets the reference voltage value of the output according to the application scenario or the working condition of the load. However, since the internal resistances and output voltages of the power supply sources 102 that make up the power supply circuit may be different, which affects the load of the power supply. In order to prevent some power supply sources 102 from overheating or being damaged due to excessive current, it is necessary to collect the supply voltages of other power supply sources 102 among the power supply sources 102, continuously adjust its own supply voltage, and complete the overall balance adjustment of the power supply circuit, thereby improving the reliability and lifespan of the power supply circuit 100.

[0048] The power supply circuit 100 in this embodiment forms a circuit structure of parallel and series hybrid. Different balance adjustments need to be carried out for the connection relationship between the power supply sources 102. Current sharing control is carried out between the mutually parallel power supply groups 101, and voltage equalization control is carried out between the mutually series-connected power supply sources 102.

[0049] The main power supply source 1021 is configured to collect the supply current of its own and the main power supply sources 1021 of other power supply groups 101, and determine the first output voltage of the main power supply source 1021 based on the average value of the supply current.

[0050] In order to carry out current sharing control between the mutually parallel power supply groups 101, each main power supply source 1021 sums up the supply currents of its own and the main power supply sources 1021 of other power supply groups 101, and then divides by the total number of power supply groups 101 to obtain the average value of the supply current, and continuously adjusts the supply voltage outputting the first output voltage according to the average value of the supply current.

[0051] The slave power supply source 1022 is configured to collect the supply voltages of all the power supply sources 102 in the power supply group 101 where it is located, and determine the second output voltage of each slave power supply source 1022 in the power supply group 101 based on the average value of the supply voltages.

[0052] In order to perform equal - voltage control among the power supply sources 102 connected in series, each slave power supply 1022 sums up its own power - supply voltage and the power - supply voltages of the master power supply 1021 and the slave power supplies 1022 in the power - supply group 101 it belongs to, and then divides the sum by the total number of the power - supply sources 102 in the power - supply group 101 to obtain the average value of the power - supply voltage. Based on the average value of the power - supply voltage, the power - supply voltage output as the second output voltage is continuously adjusted.

[0053] In a specific implementation manner, a proportional - integral controller (not shown in the figure) is provided inside the power supply source 102 for performing equal - voltage adjustment of the power - supply voltage.

[0054] The master power supply 1021 obtains a first voltage control value according to the current error value between its own supply current and the average value of the supply currents, and outputs a first output voltage according to the reference voltage value and the first voltage control value.

[0055]

[0056] Among them, is the current error value, is its own supply current, is the average value of the supply currents.

[0057]

[0058] Among them, is the first voltage control value, is the proportional gain, which determines the response intensity of the integral controller to the error value. The output of the controller is proportional to the current error signal. The proportional gain is used to quickly respond to error changes and accelerate the dynamic response of the system.

[0059] is the integral gain, which is the response speed of the integral controller to the accumulation of the error value. The integral gain is used to eliminate the steady - state error and make the system output closer to the voltage reference point. and The values of and are adjusted according to the application requirements of the power - supply circuit 100.

[0060] In the dynamic equal - voltage adjustment of the master power supply 1021, the current - sharing imbalance degree is an important parameter for evaluating the performance of the parallel power - supply groups 101, and is also the basis for judging whether current - sharing measures need to be taken.

[0061]

[0062] is the current-sharing imbalance. When the current-sharing imbalance between the main power supplies 1021 is less than 5%, it can be considered that the main power supplies 1021 are in a state of balanced power supply. When the imbalance is greater than or equal to 5%, a closed-loop control equalization adjustment scheme for the main power supplies 1021 is carried out. The range of the current-sharing imbalance for taking current-sharing measures can be adjusted according to the application requirements of the power supply circuit 100.

[0063] The slave power supply 1022 obtains a second voltage control value according to the current error value between its own supply current and the average value of the supply currents, and outputs a second output voltage according to the reference voltage value and the second voltage control value.

[0064]

[0065] Among them, is the voltage error value, is its own supply voltage, is the average value of the supply voltages.

[0066]

[0067] Among them, is the second voltage control value, is the proportional gain, which determines the response strength of the integral controller to the error value. The output of the controller is proportional to the current error signal. The proportional gain is used to quickly respond to the error change and accelerate the dynamic response of the system.

[0068] is the integral gain, which is the response speed of the integral controller to the accumulation of the error value. The integral gain is used to eliminate the steady-state error and make the system output closer to the voltage reference point. K p and The values of are adjusted according to the application requirements of the power supply circuit 100.

[0069] It can be understood that the average values of the supply voltages between each power supply group 101 may be different, so the second output voltages output by the slave power supplies 1022 of each power supply group 101 may also be different.

[0070] In the dynamic equalization adjustment of the power supply group 101, the voltage-sharing imbalance is an important parameter for evaluating the performance of the series-connected power supply groups 101 and is also the basis for judging whether current-sharing measures need to be taken.

[0071]

[0072] is the voltage equalization imbalance. When the voltage equalization imbalance between the power supplies 102 of the power supply group 101 is less than 5%, it can be considered that the power supplies 102 of the power supply group 101 are in a state of balanced power supply. When the imbalance is greater than or equal to 5%, a closed-loop control equalization adjustment scheme for the power supply group 101 is carried out. The range of the voltage equalization imbalance for taking the current sharing measure can be adjusted according to the application requirements of the power circuit 100.

[0073] In the main power supply 1021 and the slave power supply 1022, the Kp available for equalization adjustment and values can be set to the same or different values according to the application requirements of the power circuit 100.

[0074] Among them, the current sharing adjustment response speed is much greater than the voltage equalization adjustment response speed. The main power supply 1021 is the closest to the power supply bus 1011 in the power supply group 101 and usually needs to quickly respond to changes in load demand. The voltage equalization adjustment, however, requires a smoother adjustment of the voltage to avoid the impact on the system that may be caused by too fast voltage changes.

[0075] In a specific embodiment, the power circuit 100 further includes a communication bus 103, and each power supply 102 is respectively connected to the communication bus 103; among them, the main power supply 1021 obtains the power supply current value of the main power supply 1021 of other power supply groups 101 through the communication bus 103; the slave power supply 1022 obtains the power supply voltage values of all the power supplies 102 in its own power supply group 101 through the communication bus 103.

[0076] Each power supply 102 sends its own power supply voltage value and / or power supply current value through the communication bus 103 and collects the voltage values and / or power supply current values of other power supplies 102, and can react to the power circuit 100 most quickly. Specifically, the power supply 102 sends the power supply voltage, power supply current and communication address value to the communication bus 103, and after receiving the information sent by other power supplies 102 and its own information, caches them in the array of the storage element of the power supply 102 in ascending order of the communication address value for equalization adjustment.

[0077] The power supplies 102 that make up the power circuit 100 do not know the circuit connection relationship between themselves and other power supplies 102 during communication. Therefore, in a specific embodiment, the power supply 102 receives the communication address value and determines its own power supply group 101 according to the communication address value and the total number of the power supply groups 101; the power supply 102 receives the communication address values of all the power supplies 102 in its own power supply group 101, determines the power supply 102 with the smallest communication address value as the main power supply 1021, and determines itself as the main power supply 1021 or the slave power supply 1022.

[0078] After the power supply 102 determines that it is the main power supply 1021 or the slave power supply 1022, it determines the equalization adjustment scheme for itself.

[0079] In a specific embodiment, the power supply 102 includes a DIP switch 1023, and the communication address value of the power supply 102 is configured through the DIP switch 1023.

[0080] Please refer to Figure 3 , Figure 3 is a schematic diagram of the power supply structure of another embodiment of the power supply circuit of the present application. The DIP switch 1023 is a communication address configuration element composed of multiple switches, which can be composed of 2 to 10 switches configured as binary codes. During the production process of the power supply 102, the total number of switches of the DIP switch 1023 can be set according to the number of power supplies 102 that make up the power supply circuit 100. Each switch represents a binary bit, and the communication address value of each power switch is represented by different switch combinations.

[0081] In other embodiments, the control module 104 can use the communication bus 103 to send the communication address value to each power module to determine the communication address value.

[0082] In other embodiments, each power supply 102 is connected with a measurement module. The power supply voltage and / or supply current of each power supply 102 are collected through the measurement module, and then the power supply voltage and / or supply current of each power supply 102 are sent down through the communication bus 103; or each power supply 102 is connected with a control module 104 through the communication bus 103. The control module 104 uniformly collects the power supply voltage value and / or supply current value of each power supply 102 that sends each power supply 102, and after integrating the values, it is uniformly sent to each power supply 102, which can monitor each power supply 102 of the power supply circuit 100 in a timely manner.

[0083] Please refer to Figure 4 , Figure 4 is a schematic diagram of the circuit structure of another embodiment of the power supply circuit of the present application.

[0084] Among them, the power supply circuit 100 includes multiple power supply groups 101 connected in parallel with each other. Each power supply group 101 includes multiple power supplies 102 connected in series with each other, including a main power supply 1021 and multiple slave power supplies 1022;

[0085] In this application, the power supply groups 101 of the power supply circuit 100 are connected to the power supply bus 1011 through an air switch or a busbar trunking unit (not shown in the figure) to achieve mutual parallel connection. The power supply group 101 with the shortest distance to the power supply bus 1011 is configured as the main power supply 1021. The difference between the power supply 102 being configured as the main power supply 1021 or the slave power supply 1022 is only that the power supply 102 has different power supply circuits in the balancing adjustment scheme due to the circuit connection relationship. It can be understood that when the power supply circuit 100 is operating normally, the main power supply 1021 and the slave power supply 1022 are both outputting voltage at the same time, and the output power supply voltages are the same or similar and within the working range.

[0086] The main power supply 1021 is configured to collect the supply currents of its own and the main power supplies 1021 of other power supply groups 101, and determine the first output voltage of the main power supply 1021 based on the average value of the supply currents. The slave power supply 1022 is configured to collect the supply voltages of all the power supplies 102 in its power supply group 101, and determine the second output voltage of each slave power supply 1022 in the power supply group 101 based on the average value of the supply voltages.

[0087] The power supply circuit 100 in this embodiment forms a circuit structure of parallel and series hybrid, and different balancing adjustments need to be made for the connection relationship between the power supplies 102. Current sharing control is performed between the mutually parallel power supply groups 101, and voltage equalization control is performed between the mutually series-connected power supplies 102. For the specific circuit structure and balancing control scheme, reference can be made to one embodiment and another embodiment of the power supply circuit 100 of this application, which will not be elaborated here.

[0088] In a specific embodiment, the power supply circuit 100 further includes a communication bus 103, and each power supply 102 is respectively connected to the communication bus 103; wherein, the main power supply 1021 obtains the supply current values of the main power supplies 1021 of other power supply groups 101 through the communication bus 103; the slave power supply 1022 obtains the supply voltage values of all the power supplies 102 in its power supply group 101 through the communication bus 103. The power supply 102 of the power supply circuit 100 can refer to Figure 2 the communication structure schematic diagram of another embodiment of the power supply circuit of this application.

[0089] Each power supply 102 sends its own power supply voltage value and / or power supply current value, communication address value, and group number through the communication bus 103, and collects the voltage value and / or power supply current value, communication address value, and group number of other power supplies 102, and can react to the power supply circuit 100 most quickly. Specifically, the power supply 102 sends the power supply voltage, power supply current, communication address value, and group number to the communication bus 103, and after receiving the information sent by other power supplies 102 and its own information, caches them in the array of the storage element of the power supply 102 in ascending order of the communication address value for equalization adjustment.

[0090] The power supply 102 that makes up the power supply circuit 100 does not know the circuit connection relationship between itself and other power supplies 102 during communication. Therefore, in a specific embodiment, the power supply 102 receives the communication address value, and determines the power supply group 101 it belongs to according to the communication address value and the total number of the power supply groups 101; the power supply 102 receives the communication address values of all the power supplies 102 in its power supply group 101, determines the power supply 102 with the smallest communication address value as the main power supply 1021, and determines itself as the main power supply 1021 or the slave power supply 1022.

[0091] Specifically, it is set that the power supply circuit 100 is composed of M power supply groups 101 connected in parallel, and each power supply group 101 is composed of N power supplies 102 connected in series, where M≥2, N≥2, group number = address % M, that is, the group number is the value of the remainder of the address divided by the total number of power supply groups M. It should be noted that for the power supply 102 whose remainder is 0 after calculating the communication address value, the group number should be forcibly assigned as M. Therefore, the group numbers of all the power supplies 102 in the first power supply group 101 are all 1, the group numbers of all the power supplies 102 in the second power supply group 101 are all 2, and so on. The group numbers of the power supplies 102 in the last power supply group 101 are all M. It can be seen that the smallest communication address value of the power supplies 102 in each power supply group 101 is the group number, and this power supply 102 is the main power supply 1021 of the corresponding power supply group 101, that is, the power supplies 102 with communication address values from 1 to M are all main power supplies 1021.

[0092] After the power supply 102 determines itself as the main power supply 1021 or the slave power supply 1022, it determines its own equalization adjustment scheme.

[0093] In a specific embodiment, the power supply circuit 100 further includes a control module 104, and the control module 104 is coupled to the power supply 102 through the communication bus 103; the control module 104 sends a control signal to the power supply 102 through the communication bus 103, and the control signal includes the communication address value.

[0094] The control module 104 obtains the total number of power supply sources 102 and assigns communication address values from left to right and then from top to bottom according to the matrix structure of the power supplies. The communication address values can be binary coded values composed of 2 to 10 digit numerical values.

[0095] In other embodiments, it can be a combination of two forms of power supply 102, namely, configuring the communication address through the dip switch 1023 and configuring the address through the control module 104, to form the power supply circuit 100. At this time, the number of digits of the communication address values composed of binary codes needs to be equal.

[0096] In a specific embodiment, the control signal sent by the control module 104 further includes a reference voltage value. Among them, the reference voltage values of the main power supply 1021 and the slave power supply 1022 are the same.

[0097] The control module 104 sets the output reference voltage value according to the application scenario or the working condition of the load , and the reference voltage value is equal to the total output voltage of a power supply group 101 divided by the number N of power supply sources 102 connected in series in the power supply group 101. The total output voltage of the power supply group 101 can be the rated voltage value for the load to work.

[0098] A power supply circuit 100 provided in the above embodiments forms a parallel - series hybrid circuit structure, which can not only improve the power level of the power supply circuit 100 but also improve the voltage level of the power supply circuit 100. It can meet different power supply requirements, improve the working efficiency of the power supply source 102, has a simple circuit structure, can conveniently and quickly and effectively balance the output power of the power supply source 102, can adapt to the need to quickly respond to changes in load requirements, adjust the voltage more smoothly to avoid the impact that may be caused to the power system by too fast voltage changes, can better withstand the working environment of high current and voltage, improve the reliability and stability of the power supply circuit, and is beneficial to reducing production costs and maintenance costs.

[0099] This application also provides a power supply method for a power supply circuit.

[0100] Please refer to Figure 5 , Figure 5 which is a schematic flow chart of an embodiment of the power supply method of the power supply circuit of this application.

[0101] The power supply method of this embodiment is used to provide an equalization adjustment method for a parallel - series hybrid power supply circuit. The power supply circuit sets the reference voltage value of the output according to the application scenario or the working conditions of the load. However, since the internal resistances and output voltages of the power supply sources that make up the power supply circuit may be different, it will affect the load of the power supply. In order to prevent some power supply sources from overheating or being damaged due to excessive current, it is necessary to collect the supply voltages of other power supply sources between the power supply sources, continuously adjust its own supply voltage, complete the overall equalization adjustment of the power supply circuit, thereby improving the reliability and lifespan of the power supply circuit, and being able to meet the application scenarios with different voltage and current requirements.

[0102] Among them, the power supply circuit includes multiple power supply groups connected in parallel with each other. Each power supply group includes multiple power supply sources connected in series, including a main power supply source and multiple slave power supply sources.

[0103] The connection structure of the power supply circuit can refer to Figure 1 the circuit structure schematic diagram of an embodiment of the power supply circuit of this application in, which assists in the auxiliary understanding of the power supply method of this embodiment and does not limit the structure of the power supply method.

[0104] In this application, the power supply groups of the power supply circuit are connected to the power supply bus through air switches or bus - duct boxes to achieve parallel connection with each other. The power supply group closest to the power supply bus is configured as the main power supply source. And the difference between the power supply source configured as the main power supply source or the slave power supply source is only that they have different power supply sources in the equalization adjustment scheme due to the circuit connection relationship. It can be understood that when the power supply circuit is working normally, the main power supply source and the slave power supply sources are simultaneously outputting voltage, and the output supply voltages are the same or similar and within the working range.

[0105] The power supply circuit can be provided with two or more power supply groups, and each power supply group can be provided with two or more power supply sources. It is necessary to ensure that the total number of power supply groups is equal to the number of power supply sources in one power supply group, forming a power supply matrix. When ensuring that each parallel power supply group outputs voltage, there are the same number of power supply sources sharing the load together, ensuring that the load of each power supply source is relatively balanced, and increasing the reliability and stability of the power supply circuit.

[0106] The power supply method includes:

[0107] S101: The main power supply source collects the supply currents of itself and the main power supply sources of other power supply groups, and determines the first output voltage of the main power supply source based on the average value of the supply currents.

[0108] For current sharing control among power supply groups connected in parallel, each main power supply sums up the supply currents of itself and the main power supplies of other power supply groups, and then divides the sum by the total number of power supply groups to obtain the average supply current. Based on the average supply current, the supply voltage output as the first output voltage is continuously adjusted.

[0109] S102: The slave power supply collects the supply voltages of all power supplies in its power supply group, and determines the second output voltage of each slave power supply in the power supply group based on the average supply voltage.

[0110] For voltage equalization control among power supplies connected in series, each slave power supply sums up the supply voltages of itself, the main power supply and the slave power supplies in its power supply group, and then divides the sum by the total number of power supplies in the power supply group to obtain the average supply voltage. Based on the average supply voltage, the supply voltage output as the second output voltage is continuously adjusted.

[0111] Each power supply sends its own supply voltage value and / or supply current value through the communication bus, and collects the voltage value and / or supply current value of other power supplies, enabling the fastest response to the power supply circuit. Specifically, the power supply sends the supply voltage, supply current and communication address value to the communication bus, and after receiving the information sent by other power supplies and its own information, caches them in the array of the storage element of the power supply in ascending order of the communication address value for equalization adjustment.

[0112] Among them, the response speed of current sharing adjustment is much greater than that of voltage equalization adjustment. The main power supply is closest to the power supply bus in the power supply group and usually needs to quickly respond to changes in load demand. Voltage equalization adjustment, on the other hand, requires smoother voltage adjustment to avoid the impact that rapid voltage changes may cause to the system.

[0113] Please refer to Figure 6 , Figure 6 which is a schematic flowchart of another embodiment of the power supply method of the power supply circuit of the present application.

[0114] The power supply method of this embodiment is used to provide an equalization adjustment method for a parallel - series hybrid power supply circuit. The power supply circuit sets the reference voltage value of the output according to the application scenario or the working condition of the load. However, since the internal resistances and output voltages of the power supplies that make up the power supply circuit may be different, which affects the load of the power supply. To prevent some power supplies from overheating or being damaged due to excessive current, the power supplies need to collect the supply voltages of other power supplies and continuously adjust their own supply voltages to complete the overall equalization adjustment of the power supply circuit, thereby improving the reliability and lifespan of the power supply circuit and being able to meet the application scenarios with different voltage and current requirements.

[0115] The power circuit includes a plurality of power supply groups connected in parallel, each power supply group includes a plurality of power supply sources connected in series, including a main power supply source and a plurality of slave power supplies;

[0116] The connection structure of the power supply circuit can refer to Figure 1 The circuit structure diagram of an embodiment of the power supply circuit of the present application is provided to assist in understanding the power supply method of the present embodiment, but does not impose structural limitations on the power supply method.

[0117] In a specific embodiment, the power supply circuit further includes a communication bus, and each power supply is connected to the communication bus respectively; wherein the main power supply obtains the power supply current value of the main power supply of other power supply groups through the communication bus; and the slave power supply obtains the power supply voltage value of all power supplies of the power supply group to which it belongs through the communication bus. In a specific embodiment, the control signal sent by the control module also includes a reference voltage value, wherein the reference voltage values ​​of the main power supply and the slave power supply are the same.

[0118] The connection structure of the power supply circuit can refer to Figure 2 A communication structure diagram of another embodiment of the power supply circuit of the present application is provided to assist in understanding the power supply method of the present embodiment without making any structural limitation on the power supply method.

[0119] Each power supply sends its own power supply voltage value and / or power supply current value through the communication bus, and collects the voltage value and / or power supply current value of other power supplies, so as to react to the power supply circuit as quickly as possible. Specifically, the power supply sends the power supply voltage, power supply current and communication address value to the communication bus, and after receiving the information sent by other power supplies and its own information, it caches them in the array of storage elements of the power supply in descending order according to the communication address value, for balancing adjustment.

[0120] S201: The main power supply collects the power supply current of itself and the main power supplies of other power supply groups.

[0121] In order to perform current balancing control between power supply groups connected in parallel, each main power supply sums the supply current of itself and the main power supplies of other power supply groups, and then divides the sum by the total number of power supply groups to obtain the average value of the supply current, and continuously adjusts the output power voltage to the first output voltage based on the average value of the supply current.

[0122] In a specific implementation, a proportional-integral controller (not shown) is provided in the power supply to perform balanced adjustment of the power supply voltage.

[0123] S202: The main power supply obtains a first voltage control value according to a current error value between its own power supply current and an average value of the power supply current, and outputs a first output voltage according to a reference voltage value and the first voltage control value.

[0124] The main power supply obtains a first voltage control value according to the current error value between its own supply current and the average value of the supply current, and outputs a first output voltage according to the reference voltage value and the first voltage control value.

[0125]

[0126] Among them, is the current error value, is its own supply current, is the average value of the supply current.

[0127]

[0128] Among them, is the first voltage control value, K p is the proportional gain, which determines the response intensity of the integral controller to the error value. The output of the controller is proportional to the current error signal. The proportional gain is used to quickly respond to the error change and accelerate the dynamic response of the system.

[0129] is the integral gain, which is the response speed of the integral controller to the accumulation of the error value. The integral gain is used to eliminate the steady-state error and make the system output closer to the voltage reference point. K p and The values of are adjusted according to the application requirements of the power supply circuit.

[0130] In the dynamic balance adjustment of the main power supply, the current sharing imbalance is an important parameter for evaluating the performance of the parallel power supply groups, and it is also the basis for judging whether current sharing measures need to be taken.

[0131]

[0132] is the current sharing imbalance. When the current sharing imbalance between the main power supplies is less than 5%, it can be considered that the main power supplies are in a state of balanced power supply. When the imbalance is greater than or equal to 5%, a closed-loop control balance adjustment scheme for the main power supplies is carried out. The range of the current sharing imbalance for taking current sharing measures can be adjusted according to the application requirements of the power supply circuit.

[0133] S203: The slave power supply collects the supply voltages of all the power supplies in its power supply group.

[0134] In order to perform equal voltage control between the series-connected power supplies, each slave power supply sums up the supply voltages of itself, the main power supply and the slave power supplies in its power supply group, and then divides by the total number of the power supplies in the power supply group to obtain the average value of the supply voltage, and continuously adjusts the supply voltage output as the second output voltage according to the average value of the supply voltage.

[0135] S204: The slave power supply obtains a second voltage control value based on the voltage error value between its own supply voltage and the average value of the supply voltages, and outputs a second output voltage based on the reference voltage value and the second voltage control value.

[0136]

[0137] Among them, is the voltage error value, is its own supply voltage, is the average value of the supply voltages.

[0138]

[0139] Among them, is the second voltage control value, is the proportional gain, which determines the response strength of the integral controller to the error value. The output of the controller is proportional to the current error signal. The proportional gain is used to quickly respond to the error change and accelerate the dynamic response of the system.

[0140] is the integral gain, which is the response speed of the integral controller to the accumulation of the error value. The integral gain is used to eliminate the steady-state error and make the system output closer to the voltage reference point. and The values of are adjusted according to the application requirements of the power supply circuit.

[0141] It can be understood that the average values of the supply voltages between each power supply group may be different, so the second output voltages output by the slave power supplies of each power supply group may also be different.

[0142] In the dynamic equalization adjustment of the power supply group, the voltage equalization imbalance degree is an important parameter for evaluating the performance of the series-connected power supply groups and is also the basis for judging whether current sharing measures need to be taken.

[0143]

[0144] is the voltage equalization imbalance degree. When the voltage equalization imbalance degree between the power supplies of the power supply group is less than 5%, it can be considered that the power supplies of the power supply group are in the state of balanced power supply. When the imbalance degree is greater than or equal to 5%, a closed-loop control equalization adjustment scheme for the power supply group is carried out. The range of the voltage equalization imbalance degree for taking current sharing measures can be adjusted according to the application requirements of the power supply circuit.

[0145] In the available for equalization adjustment of the main power supply and the slave power supply and The values of can be set to be the same or different according to the application requirements of the power supply circuit.

[0146] Among them, the response speed of current sharing adjustment is much greater than that of voltage equalization adjustment. The main power supply is the closest to the power supply bus in the power supply group and usually needs to quickly respond to changes in load demand. Voltage equalization adjustment, on the other hand, needs to adjust the voltage more smoothly to avoid the impact on the system that may be caused by too rapid voltage changes.

[0147] Please refer to Figure 7 , Figure 7 which is a schematic flowchart of another embodiment of the power supply method of the power supply circuit of the present application.

[0148] The power supply method of this embodiment is used to provide an equalization adjustment method for a parallel - series hybrid power supply circuit. The power supply circuit sets the reference voltage value of the output according to the application scenario or the working condition of the load. However, since the internal resistances and output voltages of the power supplies constituting the power supply circuit may be different, which affects the load of the power supply. To prevent some power supplies from overheating or being damaged due to excessive current, it is necessary to collect the supply voltages of other power supplies among the power supplies, continuously adjust their own supply voltages, complete the overall equalization adjustment of the power supply circuit, thereby improving the reliability and lifespan of the power supply circuit and being able to meet application scenarios with different voltage and current requirements.

[0149] Among them, the power supply circuit includes multiple power supply groups connected in parallel with each other. Each power supply group includes multiple power supplies connected in series with each other, including a main power supply and multiple slave power supplies.

[0150] The connection structure of the power supply circuit can refer to Figure 1 the circuit structure schematic diagram of an embodiment of the power supply circuit of the present application, which helps to understand the power supply method of this embodiment and does not limit the structure of the power supply method.

[0151] The power supplies constituting the power supply circuit do not know the circuit connection relationship between themselves and other power supplies during communication. Therefore, in a specific embodiment, the power supply receives the communication address value, calculates the remainder of the communication address value divided by the total number of power supply groups to obtain the group number, and determines the power supply group it belongs to; the power supply receives the communication address values of all the power supplies in its power supply group, determines the power supply with the smallest communication address value as the main power supply, and determines itself as the main power supply or a slave power supply.

[0152] After the power supply determines itself as the main power supply or a slave power supply, it determines the equalization adjustment scheme for itself.

[0153] S301: The power supply receives the communication address value; according to the communication address value, calculates the remainder when divided by the total number of power supply groups to obtain the group number, and determines the power supply group it belongs to.

[0154] In a specific embodiment, the power supply circuit further includes a communication bus, and each power supply is respectively connected to the communication bus; wherein, the main power supply obtains the supply current value of the main power supply of other power supply groups through the communication bus; the slave power supply obtains the supply voltage values of all power supplies in its power supply group through the communication bus.

[0155] Each power supply sends its own supply voltage value and / or supply current value through the communication bus, and collects the voltage value and / or supply current value of other power supplies, which can react to the power supply circuit most quickly. Specifically, the power supply sends the supply voltage, supply current and communication address value to the communication bus, and after receiving the information sent by other power supplies and its own information, it caches them into the array of storage elements of the power supply in ascending order of the communication address value for balancing adjustment.

[0156] In a specific embodiment, the power supply includes a DIP switch, and the communication address value of the power supply is configured through the DIP switch. The power supply structure including the DIP switch can refer to Figure 3 the schematic diagram of the power supply structure of another embodiment of the power supply circuit of this application in

[0157] Or, in a specific embodiment, the power supply circuit further includes a control module, and the control module is coupled to the power supply through the communication bus; the control module sends a control signal to the power supply through the communication bus, and the control signal includes a communication address value. The control module obtains the total number of power supplies, and distributes the communication address value from left to right and then from top to bottom according to the matrix structure of the power supplies. The communication address value can be a binary coded value composed of 2 to 10 digits.

[0158] In other embodiments, it can be a combination of power supplies configured with communication addresses through DIP switches and configured with addresses through control modules to form a power supply circuit. At this time, the number of digits of the communication address value composed of binary codes needs to be equal.

[0159] S302: The power supply receives the communication address values of all power supplies in its power supply group, determines the power supply with the smallest communication address value as the main power supply, and determines itself as the main power supply or the slave power supply.

[0160] Specifically, please refer to Figure 8 , Figure 8 is Figure 7Schematic diagram of the main power supply and slave power supply distribution process for another embodiment of the power supply method of the power supply circuit of the present application.

[0161] It is set that the power supply circuit is composed of M power supply groups in parallel, and each power supply group is composed of N power supplies in series, where M≥2 and N≥2. The group number = address % M, that is, the group number is the value obtained by taking the remainder of the address divided by the total number of power supply groups M. It should be noted that for the power supply with a remainder of 0 obtained after calculating the communication address value, the group number should be forcibly assigned as M. Therefore, the group numbers of all power supplies in the first power supply group are all 1, the group numbers of all power supplies in the second power supply group are all 2, and so on. The group numbers of the power supplies in the last power supply group are all M. It can be seen that the smallest communication address value of the power supplies in each power supply group is the group number, and this power supply is the main power supply of the corresponding power supply group, that is, the power supplies with communication address values from 1 to M are all main power supplies.

[0162] After the power supply determines whether it is the main power supply or the slave power supply itself, it determines its own equalization adjustment scheme.

[0163] S303: The main power supply collects the supply currents of itself and the main power supplies of other power supply groups.

[0164] S304: The main power supply obtains the first voltage control value according to the current error value between its own supply current and the average value of the supply currents, and outputs the first output voltage according to the reference voltage value and the first voltage control value.

[0165] In order to perform current sharing control between the mutually parallel power supply groups, each main power supply sums up the supply currents of itself and the main power supplies of other power supply groups, and then divides by the total number of power supply groups to obtain the average value of the supply currents, and continuously adjusts the supply voltage output as the first output voltage according to the average value of the supply currents. Specifically, steps S303 and S304 of the adjustment scheme of the main power supply can refer to S201 and S202 respectively, which will not be elaborated here.

[0166] S305: The slave power supply collects the supply voltages of all the power supplies in its power supply group.

[0167] S306: The slave power supply obtains the second voltage control value according to the voltage error value between its own supply voltage and the average value of the supply voltages, and outputs the second output voltage according to the reference voltage value and the second voltage control value.

[0168] In order to perform equal - voltage control between power supply sources connected in series with each other, each slave power supply sums up the power - supply voltages of itself, the main power supply and the slave power supplies in the power - supply group where it is located, and then divides the sum by the total number of power - supply sources in the power - supply group to obtain the average value of the power - supply voltage. Based on the average value of the power - supply voltage, the power - supply voltage output as the second output voltage is continuously adjusted. Specifically, steps S305 and S306 of the adjustment scheme of the slave power supply can refer to S203 and S204 respectively.

[0169] Among them, the response speed of current sharing adjustment is much greater than that of equal - voltage adjustment. The main power supply is the closest to the power - supply bus in the power - supply group and usually needs to quickly respond to changes in load demand. Equal - voltage adjustment, on the other hand, requires smoother voltage adjustment to avoid the impact on the system that may be caused by too rapid voltage changes.

[0170] Different from the prior - art situation, a power - supply circuit and a power - supply method form a parallel - series hybrid circuit structure, which can not only improve the power level of the power - supply circuit but also increase the voltage level of the power - supply circuit. It can meet different power - supply requirements, improve the working efficiency of the power - supply source, has a simple circuit structure, can conveniently, quickly and effectively balance the output power of the power - supply sources, can adapt to the need to quickly respond to changes in load demand, adjust the voltage more smoothly to avoid the impact on the power system that may be caused by too rapid voltage changes, can better withstand the working environment of high current and voltage, improve the reliability and stability of the power - supply circuit, and is conducive to reducing production costs and maintenance costs.

[0171] In several implementation manners provided in the present application, it should be understood that the disclosed system and device can be implemented in other ways. For the technical solutions in the embodiments of the present application, obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. For example, the above - described device implementation manner is only illustrative. For example, the division of the modules or units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the shown or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other forms.

[0172] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present application, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0173] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "coupled", "connected", "joined", "arranged", "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0174] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0175] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0176] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present application.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes multiple power supply groups connected in parallel with each other. Each power supply group includes multiple power supplies connected in series, including a main power supply and multiple slave power supplies; The main power supply is configured to collect the supply currents of itself and the main power supplies of other power supply groups, and determine a first output voltage of the main power supply based on the average value of the supply currents; The slave power supplies are configured to collect the supply voltages of all the power supplies in the power supply group where they are located, and determine second output voltages of the slave power supplies in the power supply group based on the average value of the supply voltages; The power supply circuit further includes a communication bus, and each power supply is respectively connected to the communication bus; wherein, the main power supply obtains the supply current values of the main power supplies of other power supply groups through the communication bus; the slave power supplies obtain the supply voltage values of all the power supplies in the power supply group where they are located through the communication bus; The power supply receives a communication address value, and determines the power supply group it belongs to according to the communication address value and the total number of the power supply groups; the power supply receives the communication address values of all the power supplies in the power supply group it belongs to, determines the power supply with the smallest communication address value as the main power supply, and determines itself as the main power supply or a slave power supply.

2. The power supply circuit according to claim 1, wherein, The main power supply obtains a first voltage control value according to the current error value between its own supply current and the average value of the supply currents, and outputs the first output voltage according to the reference voltage value and the first voltage control value; The slave power supply obtains a second voltage control value according to the voltage error value between its own supply voltage and the average value of the supply voltages, and outputs the second output voltage according to the reference voltage value and the second voltage control value.

3. The power supply circuit according to claim 1, wherein, The power supply circuit further includes a control module, and the control module is coupled to the power supply through the communication bus; the control module sends a control signal to the power supply through the communication bus, and the control signal includes a communication address value.

4. The power supply circuit according to claim 3, wherein, The control signal sent by the control module further includes a reference voltage value, and the reference voltage values of the main power supply and the slave power supplies are the same.

5. The power supply circuit according to claim 1, wherein The power supply includes a DIP switch, and the communication address value of the power supply is configured through the DIP switch.

6. A power supply method for a power circuit, characterized in that, The power supply circuit includes multiple power supply groups connected in parallel with each other. Each power supply group includes multiple power supplies connected in series, including a main power supply and multiple slave power supplies; The power supply circuit further includes a communication bus, and each power supply is respectively connected to the communication bus; The power supply method includes: The power supply receives a communication address value, and determines the power supply group it belongs to according to the communication address value and the total number of the power supply groups; the power supply receives the communication address values of all the power supplies in the power supply group it belongs to, determines the power supply with the smallest communication address value as the main power supply, and determines itself as the main power supply or a slave power supply; The main power supply collects the supply currents of itself and the main power supplies of other power supply groups, and determines a first output voltage of the main power supply based on the average value of the supply currents; The subordinate power supply collects the supply voltages of all power supplies in its power supply group, and determines the second output voltage of each subordinate power supply in the power supply group based on the average value of the supply voltages. Specifically, it includes: the main power supply obtains the supply current value of the main power supply of the other power supply group through the communication bus; the subordinate power supply obtains the supply voltage values of all power supplies in its power supply group through the communication bus.

7. The power supply method according to claim 6, characterized in that, The power supply method includes: The step of determining the first output voltage of the main power supply based on the average value of the supply current includes: the main power supply obtains a first voltage control value according to the current error value between its own supply current and the average value of the supply current, and outputs the first output voltage according to the reference voltage value and the first voltage control value. The step of determining the second output voltage of each subordinate power supply in the power supply group based on the average value of the supply voltage includes: the subordinate power supply obtains a second voltage control value according to the voltage error value between its own supply voltage and the average value of the supply voltage, and outputs the second output voltage according to the reference voltage value and the second voltage control value.

8. The power supply method according to claim 6, characterized in that Before the step that the main power supply collects the supply currents of its own main power supply and the main power supplies of other power supply groups, it includes: the power supply receives a communication address value; takes the remainder of the total number of power supply groups according to the communication address value to obtain a group number, and determines the power supply group it belongs to. The power supply receives the communication address values of all the power supplies in the power supply group it belongs to, determines the power supply with the smallest communication address value as the main power supply, and determines itself as the main power supply or the subordinate power supply.

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