A switching power supply control method, device and power supply system

Abstract

The application provides a switching power supply control method, device and power supply system, the method comprising: determining any one of N transformer modules as a master module, and taking the remaining transformer modules except the master module as slave modules; when receiving a control instruction, outputting a synchronization signal to each slave module; determining a delay time corresponding to each slave module according to a first time of outputting the synchronization signal and a second time of each slave module receiving the synchronization signal; performing phase shift control on the master module, and performing phase shift control on each slave module based on the delay time, so that the driving signals of each transformer module and each transformer in each transformer module are uniformly phase shifted in a preset period. The technical scheme of the application can effectively reduce the input current ripple of the switching power supply, thereby realizing reduction of the output current ripple of an input source connected with the switching power supply, and ensuring the performance and service life of the input source.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply control, in particular to a switching power supply control method, device and power supply system. BACKGROUND

[0002] At present, in many application occasions, the input current ripple of the switching power supply needs to be controlled within the allowable range, so as to control the output current ripple of the input source connected with the switching power supply within the allowable range, so as to ensure the performance and service life of the input source. Taking the fuel cell as an example, if the output current of the fuel cell has ripple in the use process, the corresponding voltage ripple will be generated on the internal resistance of the fuel cell, causing the output power fluctuation, resulting in energy loss and reducing the service life of the fuel cell. Therefore, it is required that the output current ripple of the fuel cell is as small as possible, that is, the current ripple input to the switching current is as small as possible, so as to ensure the service life of the fuel cell.

[0003] At present, the switching power supply often adopts multi-stage interleaved parallel DC / DC (direct current / direct current) converter or DC / AC (direct current / alternating current) converter to reduce the input current ripple. However, due to the limitation of the number of digital processing chip ports, the number of converters that can be interleaved and connected in parallel in a single module is limited, wherein a single module includes one digital processing chip and multiple converters, so multiple modules are often connected in parallel, but at this time, the interleaved phase is random, which leads to the inability to effectively reduce the input current ripple of the switching power supply. SUMMARY

[0004] The problem solved by the present application is how to effectively reduce the input current ripple of the switching power supply, so as to reduce the output current ripple of the input source connected with the switching power supply, and ensure the performance and service life of the input source.

[0005] To solve the above problems, the present application provides a switching power supply control method, device and power supply system.

[0006] In a first aspect, the present application provides a switching power supply control method, the switching power supply includes N parallel converter modules, N≥2, each of the converter modules includes multiple interleaved parallel converters, and the switching power supply control method includes:

[0007] determining any one of the N converter modules as a master module, and taking the remaining converter modules except the master module as slave modules;

[0008] outputting a synchronization signal to each of the slave modules when receiving a control instruction;

[0009] determine a delay time corresponding to each of the slave modules according to a first time when the synchronization signal is output and a second time when the synchronization signal is received by each of the slave modules;

[0010] perform phase shift control on the master module and perform phase shift control on each of the slave modules based on the delay time, so that the driving signals of each of the converter modules and each of the converters in each of the converter modules are uniformly phase shifted within a preset period.

[0011] Optionally, the preset period is a switching period.

[0012] Optionally, the phase shift control on the master module comprises:

[0013] determine any one of the converters in the master module as a master, set a first reference time as the phase shift time of the driving signals of each of the converters in the master module, and set a first reference phase as the phase of the driving signal of the master;

[0014] determine a first phase difference of the driving signal of each of the converters other than the master in the master module relative to the driving signal of the master based on a preset phase and a total number of converters contained in the master module, and the preset phase is 2π.

[0015] control the master to act according to the driving signal with the first reference time and the first reference phase, and control each of the converters other than the master in the master module to act according to the driving signal with the first reference time and the first phase difference respectively.

[0016] Optionally, the determination of the first phase difference of the driving signal of each of the converters other than the master in the master module relative to the driving signal of the master based on the preset phase and the total number of converters contained in the master module comprises:

[0017] determine the number of each of the converters other than the master relative to the master based on a preset rule;

[0018] determine a second phase difference between the driving signals of each two adjacent converters in the master module according to the preset phase and the total number of converters contained in the master module;

[0019] for any one of the converters i other than the master in the master module, determine the first phase difference of the driving signal of the converter i relative to the driving signal of the master according to the second phase difference and the number of the converter i.

[0020] Optionally, the phase-shifting control of each of the slave modules based on the delay time comprises:

[0021] determining an arbitrary converter in each of the slave modules as a target converter, and setting a phase of the target converter as a second reference phase;

[0022] determining a relative phase-shifting time of the driving signal of each of the converters in each of the slave modules relative to the driving signal of the master based on the switching period, the total number of the converter modules, and the delay time corresponding to each of the slave modules;

[0023] determining a third phase difference of the driving signal of each of the converters in each of the slave modules except the target converter relative to the driving signal of the corresponding target converter based on the preset phase and the total number of the converters included in each of the slave modules;

[0024] controlling the target converter in each of the slave modules to act according to the driving signal with parameters of the relative phase-shifting time and the second reference phase, and controlling each of the converters in each of the slave modules except the target converter to act according to the driving signal with parameters of the relative phase-shifting time and the third phase difference.

[0025] Optionally, the determination of the relative phase-shifting time of the driving signal of each of the converters in each of the slave modules relative to the driving signal of the master based on the switching period, the total number of the converter modules, and the delay time corresponding to each of the slave modules comprises:

[0026] numbering each of the slave modules according to the order of receiving the synchronization signal;

[0027] determining a phase-shifting time difference between each two adjacent converter modules according to the switching period and the total number of the converter modules;

[0028] for an arbitrary slave module j, determining a phase-shifting time initial value of the driving signal of each of the converters in the slave module j relative to the driving signal of the master according to the phase-shifting time difference and the number of the slave module j;

[0029] determining the relative phase-shifting time of the driving signal of each of the converters in the slave module j relative to the driving signal of the master according to the phase-shifting time initial value and the delay time corresponding to the slave module j.

[0030] Optionally, the third phase difference of the driving signal of each of the transformers other than the target transformer in each of the slave modules relative to the driving signal of the target transformer is determined based on the preset phase and the total number of transformers included in each of the slave modules.

[0031] For any one of the slave modules j, the number of each of the transformers other than the target transformer in the slave module j relative to the corresponding target transformer is determined based on a preset rule;

[0032] The fourth phase difference between the driving signals of each of two adjacent transformers in the slave module j is determined according to the preset phase and the total number of transformers included in the slave module j.

[0033] For any one of the transformers other than the target transformer in the slave module j, the third phase difference of the driving signal of the transformer k relative to the driving signal of the target transformer in the slave module j is determined according to the fourth phase difference and the number of the transformer k.

[0034] In a second aspect, the present application provides a switching power supply control device, the switching power supply comprising N parallel transformer modules, N≥2, each of the transformer modules comprising a plurality of interleaved parallel transformers, the switching power supply control device comprising:

[0035] A configuration module is configured to determine any one of the N transformer modules as a master module, and the remaining transformer modules other than the master module as slave modules;

[0036] A processing module is configured to output a synchronization signal to each of the slave modules when a control instruction is received, and determine a corresponding delay time of each of the slave modules according to a first time of outputting the synchronization signal and a second time of receiving the synchronization signal by each of the slave modules.

[0037] A control module is configured to perform phase shift control on the master module, and perform phase shift control on each of the slave modules based on the delay time, so that the driving signals of each of the transformer modules and each of the transformers in each of the transformer modules are uniformly phase shifted within a preset period.

[0038] In a third aspect, the present application provides a power supply system controlled by the switching power supply control method of any one of the first aspect, comprising N parallel transformer modules, N≥2, each of the transformer modules comprising a plurality of interleaved parallel transformers, the power input end of each of the transformer modules being used to connect the output end of an input source, and the power output end of each of the transformer modules being used to provide power for a load.

[0039] Optionally, the converter module comprises one master module and N-1 slave modules, the signal input end of the master module is used for receiving control instructions, and the signal output end of the master module is electrically connected with the signal input end of each slave module.

[0040] Optionally, the signal output end of the master module is connected with each slave module in turn through a twisted pair, or all the slave modules are connected in parallel through a twisted pair, and the common end formed by the signal input ends of all the slave modules is electrically connected with the signal output end of the master module through a twisted pair.

[0041] Optionally, the master module further comprises a first control unit, a first single-ended operational amplifier and a differential operational amplifier, the driving signal output end of the first control unit is electrically connected with the driving signal input end of each converter in the master module, the signal input end of the first control unit is used for receiving control instructions, the synchronous signal output end of the first control unit is electrically connected with the input end of the first single-ended operational amplifier, and the output end of the first single-ended operational amplifier is electrically connected with the signal input end of each slave module through the differential operational amplifier.

[0042] Optionally, the slave module further comprises a second control unit and a second single-ended operational amplifier, the driving signal output end of the second control unit is electrically connected with the driving signal input end of each converter in the slave module, the synchronous signal input end of the second control unit is electrically connected with the output end of the second single-ended operational amplifier, and the input end of the second single-ended operational amplifier is electrically connected with the signal output end of the master module.

[0043] Optionally, the input source comprises at least one of a fuel cell, a photovoltaic power generation device and a wind power generation device, and the converter comprises at least one of a boost circuit and a buck circuit.

[0044] The switch power supply control method, device and power supply system have the following beneficial effects: any one of the N transformer modules is determined as a master module, and the remaining transformer modules except the master module are slave modules; when receiving an external input control instruction, the master module outputs a synchronization signal to each slave module; the first time of outputting the synchronization signal and the second time of receiving the signal by the slave module are used to determine the delay time of each slave module relative to the master module; the master module is subjected to phase shift control, so that the phase of each transformer driving signal in the master module is uniformly phase shifted; each slave module is subjected to phase shift control based on the delay time, so that the phase shift time of the driving signal of each slave module and the master module is uniformly distributed in a preset period, and the phase of each transformer driving signal in each slave module is uniformly phase shifted; the driving signal of each transformer is uniformly phase shifted in the preset period through phase shift control, so that the current ripple superposition caused by the phase concentration of the driving signal is avoided as much as possible, the input current ripple of the switch power supply is effectively reduced, and the output current ripple of the input source connected to the switch power supply is reduced, so that the performance and service life of the input source are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 A structure schematic diagram of a power supply system according to an embodiment of the present application;

[0046] Figure 2 A structure schematic diagram of a power supply system according to an embodiment of the present application;

[0047] Figure 3 A flowchart of a switch power supply control method according to an embodiment of the present application;

[0048] Figure 4 An input current waveform schematic diagram of each transformer in a transformer module according to an embodiment of the present application;

[0049] Figure 5 A structure schematic diagram of a switch power supply control device according to an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be interpreted as being limited to the embodiments described herein, rather, these embodiments are provided to make the present application more thorough and complete. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes, and are not intended to limit the protection scope of the present application.

[0051] It should be understood that each of the steps recited in the method embodiments of the present application can be performed in different orders and / or in parallel. In addition, the method embodiments can include additional steps and / or omit performing the steps shown. The scope of the present application is not limited in this respect.

[0052] The term "comprises" and variations thereof herein are open-ended, that is, "comprising but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optional" means "optional in at least some embodiments". Related definitions are given throughout the description. It is noted that the concepts "first", "second", etc. mentioned in the present application are only used to distinguish different apparatuses, modules or units, and are not intended to limit the order or interdependence of the functions performed by these apparatuses, modules or units.

[0053] It should be noted that the modification of "one" or "multiple" mentioned in the present application is illustrative and not limiting, and those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0054] The names of the messages or information exchanged between the plurality of apparatuses in the embodiments of the present application are only for illustrative purposes, and are not intended to limit the scope of the messages or information.

[0055] In the prior art, the interleaved phases of the plurality of converter modules are random, and when the output currents of the plurality of converter modules are superimposed, the current ripple is superimposed, and the ripple cannot be effectively reduced.

[0056] As shown in Figure 1 and Figure 2 The power supply system provided by the embodiments of the present application is controlled by the switch power supply control method described below, and includes N parallel converter modules, N≥2, each of the converter modules includes a plurality of interleaved converters in parallel, the power supply input end of each of the converter modules is used to connect the output end of an input source, and the power supply output end of each of the converter modules is used to provide power for a load.

[0057] Specifically, the input end of the converter is used to be electrically connected with the output end of a power generation device, the output end of the converter is used to be electrically connected with the input end of a load, the converter is used to convert the power output by the power generation device, and then provide power for the load, and the input source can include at least one of a fuel cell, a photovoltaic power generation device, a wind power generation device and the like.

[0058] Optionally, the converter module comprises one host module and N-1 slave modules, the signal input end of the host module is used for receiving control instructions, and the signal output end of the host module is electrically connected with the signal input end of each slave module.

[0059] Specifically, any one of the converter modules can be selected as the host module, and the other modules except the host module are slave modules; or the BMS (Battery Management System) is used as the host module, and each converter module is used as a slave module.

[0060] Optionally, the signal output end of the host module is connected with each slave module in series through a twisted pair, or all the slave modules are connected in parallel through the twisted pair, and the common end formed by the signal input ends of all the slave modules is electrically connected with the signal output end of the host module through the twisted pair.

[0061] Specifically, the twisted pair is used as a bus to connect the host module and each slave module, and each slave module can be connected in series or in parallel. The synchronization signal output by the host module is converted into a differential signal, and then transmitted to each slave module through the twisted pair.

[0062] In the optional embodiment, the twisted pair is used to transmit the synchronization signal output by the host module to each slave module, which can reduce the interference in signal transmission, reduce the delay in signal transmission, avoid the inaccuracy of phase control caused by the delay, and improve the accuracy of phase shift control of the slave module.

[0063] Optionally, the host module further comprises a first control unit, a first single-ended operational amplifier and a differential operational amplifier, the driving signal output end of the first control unit is electrically connected with the driving signal input end of each converter in the host module, the signal input end of the first control unit is used for receiving control instructions, the synchronization signal output end of the first control unit is electrically connected with the input end of the first single-ended operational amplifier, and the output end of the first single-ended operational amplifier is electrically connected with the signal input end of each slave module through the differential operational amplifier.

[0064] Specifically, when one converter module is used as the host module, the first control unit of the host module receives the control instructions input from the outside, and then generates a synchronization signal and a driving signal. The driving signal is transmitted to each converter in the host module to drive each converter to act. After the processing of the first single-ended operational amplifier and the differential operational amplifier, the synchronization signal is transmitted to the signal input end of each slave module through the twisted pair.

[0065] The synchronization signal output end of the first control unit is connected to the non-inverting input end of the first single-ended operational amplifier, the inverting input end of the first single-ended operational amplifier is grounded, the output end of the first single-ended operational amplifier is connected to the input end of the differential operational amplifier, and the output end of the differential operational amplifier is connected to the signal input end of each slave module through a twisted pair.

[0066] Optionally, the slave module further comprises a second control unit and a second single-ended operational amplifier, the drive signal output end of the second control unit is electrically connected to the drive signal input end of each transformer in the slave module, the synchronization signal input end of the second control unit is electrically connected to the output end of the second single-ended operational amplifier, and the input end of the second single-ended operational amplifier is electrically connected to the signal output end of the master module.

[0067] Optionally, the transformer comprises at least one of a boost circuit and a buck circuit.

[0068] Specifically, all transformers in a single transformer module are connected in parallel in an interleaved manner, and the input end of the second single-ended operational amplifier is electrically connected to the output end of the differential operational amplifier in the master module through a twisted pair.

[0069] In the optional embodiment, any one of all existing transformer modules is selected as a master module, the master module is connected to each slave module through a twisted pair, only one IO interface of the master module and the second control unit of the slave module is occupied, the occupation of the interface resource is reduced, only one single-ended operational amplifier and one differential operational amplifier need to be added, the device cost is low, the control algorithm is simple, and the control is facilitated.

[0070] As shown in Figure 3 The switching power supply control method provided by the embodiment of the application comprises the following steps:

[0071] In step S100, any one of N transformer modules is determined as a master module, and the remaining transformer modules except the master module are determined as slave modules.

[0072] It can be understood that the BMS can also be used as the master module, and each transformer module can be used as a slave module.

[0073] In step S200, when a control instruction is received, a synchronization signal is output to each slave module.

[0074] Specifically, when the master module receives a control instruction, a synchronization signal is generated and transmitted to each slave module.

[0075] Step S300, determining the delay time corresponding to each slave module according to the first time of outputting the synchronization signal and the second time of receiving the synchronization signal by each slave module.

[0076] Specifically, in order to avoid the influence of the delay time caused by signal transmission on the subsequent phase shift control accuracy, the delay time corresponding to each slave module can be determined according to the difference between the second time of receiving the synchronization signal by each slave module and the first time of outputting the synchronization signal by the master module.

[0077] Step S400, performing phase shift control on the master module, and performing phase shift control on each slave module based on the delay time, so that the driving signals of each converter module and each converter in each converter module are uniformly phase shifted in a preset period.

[0078] Optionally, the preset period is a switching period.

[0079] Specifically, the phase shift control on each converter in the master module can be performed at the first time of generating the synchronization signal, and the driving signals of each converter are uniformly phase shifted in a preset phase. Moreover, the phase shift time of the driving signals of the converters in each slave module can be adjusted according to the delay time, so that the phase shift control on the converters in each slave module is performed, and the phase shift time of the driving signals received by the converters in each slave module is uniformly distributed in a preset period (switching period), wherein the time of receiving the driving signals by each converter in the same converter module is the same, and the phases of the driving signals received by each converter are uniformly phase shifted in a preset phase.

[0080] Exemplarily, for any one converter module, assuming that the converter module includes four converters, the time of receiving the driving signals by the four converters is the same, and the corresponding four driving signals are uniformly phase shifted in a preset phase 2π, and the phase difference between the driving signals of each two adjacent converters is 90°.

[0081] In the embodiment, any one of the N transformer modules is determined as the master module, and the remaining transformer modules except the master module are determined as the slave modules. When receiving the control instruction input from the outside, the master module outputs a synchronization signal to each of the slave modules. The first time of outputting the synchronization signal and the second time of receiving the signal by the slave modules are used to determine the delay time of each of the slave modules relative to the master module. The phase of each of the transformer driving signals in the master module is uniformly shifted by performing the phase shift control on the master module. The phase shift time of the driving signals of each of the slave modules and the master module is uniformly distributed in the preset period by performing the phase shift control on each of the slave modules based on the delay time, and the phase of each of the transformer driving signals in each of the slave modules is uniformly shifted. By performing the phase shift control, the transformer driving signals are uniformly shifted in the preset period, which can avoid the current ripple superposition caused by the phase concentration of the driving signals as much as possible, effectively reduces the input current ripple of the switching power supply, and further reduces the output current ripple of the input source connected to the switching power supply, thereby ensuring the performance and service life of the input source.

[0082] Optionally, the output of the synchronization signal to each of the slave modules comprises:

[0083] The synchronization signal is generated and converted into a differential signal, and the differential signal is transmitted to each of the slave modules through a twisted pair line.

[0084] In the optional embodiment, the synchronization signal is converted into a differential signal and transmitted through a twisted pair line, which reduces the signal delay time compared with the CAN bus communication in the prior art.

[0085] Optionally, the phase shift control on the master module comprises:

[0086] In step S411, any one of the transformers in the master module is determined as the master, the phase shift time of the driving signal of each of the transformers in the master module is set as the first reference time, and the phase of the driving signal of the master is set as the first reference phase.

[0087] Specifically, the phase shift time (the first reference time) of the driving signal of the master can be set as 0 time of the switching period. Since the phase shift time of the driving signal of each of the transformers in the master module is the same, i.e., the phase shift time of the driving signal of each of the transformers in the master module can be 0 time.

[0088] In step S412, based on a preset phase and the total number of transformers contained in the master module, the first phase difference of the driving signal of each of the transformers except the master in the master module relative to the driving signal of the master is determined. The preset phase is 2π.

[0089] Step S413, controlling the host to act according to the driving signal with the parameters of the first reference time and the first reference phase, and controlling each of the converters in the host module to act according to the driving signal with the parameters of the first reference time and the first phase difference respectively.

[0090] Specifically, after the phase shift time and the phase of the driving signal of the converter in the host module are determined, the corresponding converter is controlled to act according to the determined driving signal. The driving signal of the host corresponds to the first reference time and the first reference phase, the driving signal of each of the converters in the host module except the host corresponds to the first reference time, and the phase is determined by the first reference phase and the corresponding first phase difference, which can be directly obtained by adding the first reference phase and the first phase difference.

[0091] Optionally, the determining of the first phase difference of the driving signal of each of the converters in the host module except the host relative to the driving signal of the host based on the preset phase and the total number of the converters contained in the host module comprises:

[0092] Step S4121, determining the number of each of the converters in the host module except the host relative to the host based on a preset rule.

[0093] Specifically, the preset rule can be compiled according to actual needs, which is not limited here. For example, each of the converters in the host module except the host can be numbered in the order from near to far relative to the host, or each of the converters in the host module except the host can be numbered in the order from short to long relative to the line between the first control unit and the host module.

[0094] Step S4122, determining the second phase difference between the driving signals of each two adjacent converters in the host module based on the preset phase and the total number of the converters contained in the host module.

[0095] Specifically, the second phase difference between the driving signals of each two adjacent converters in the host module can be obtained by dividing 2π by the total number of the converters contained in the host module.

[0096] Step S4123, for any one of the converters i in the host module except the host, determining the first phase difference of the driving signal of the converter i relative to the driving signal of the host based on the second phase difference and the number of the converter i.

[0097] Specifically, the number of the converter i represents the interval between the converter i and the host, and multiplying the number of the converter i by the second phase difference can obtain the first phase difference of the driving signal of the converter i relative to the driving signal of the host, i.e., the first phase difference of the driving signal of the converter i in the host module relative to the driving signal of the host is (2π*i) / total number of the converters in the host module.

[0098] For example, assuming that the total number of the converters in the host module is M, the first phase difference corresponding to the driving signal of the converter i is (2π*i) / M.

[0099] Optionally, the phase-shifting control of each of the slave modules based on the delay time comprises:

[0100] In step S421, an arbitrary converter in each of the slave modules is determined as a target converter, and the phase of the target converter is set as a second reference phase.

[0101] Specifically, one target converter is determined in each of the slave modules, and for N-1 slave modules, there are N-1 target converters.

[0102] In step S422, based on the switching period, the total number of the converter modules and the delay time corresponding to each of the slave modules, the relative phase-shifting time of the driving signal of each of the converters in each of the slave modules relative to the driving signal of the host is determined.

[0103] In step S423, based on the preset phase and the total number of the converters included in each of the slave modules, the third phase difference of the driving signal of each of the converters in each of the slave modules except the target converter relative to the driving signal of the corresponding target converter is determined.

[0104] In step S424, each of the target converters is controlled to act according to the driving signal with parameters of the relative phase-shifting time and the second reference phase, and each of the converters in each of the slave modules except the target converter is controlled to act according to the driving signal with parameters of the relative phase-shifting time and the third phase difference.

[0105] Specifically, after determining the phase shift time and phase of the drive signal of the converter in each slave module, the corresponding converter is controlled to act according to the determined drive signal. Wherein, for any slave module j, after determining the first reference time of the drive signal of the master, the corresponding relative phase shift time of the slave module j is added to the first reference time to obtain the phase shift time of the target converter of the slave module j, and the target converter is controlled to act according to the drive signal corresponding to the phase shift time and the second reference phase; the third phase difference corresponding to the slave module j is added to the second reference phase to obtain the phase of each converter except the target converter in the slave module j, and each converter except the target converter in the slave module j is controlled to act according to the drive signal corresponding to the same phase shift time of the target converter.

[0106] Optionally, the determining of the relative phase shift time of the drive signal of each converter in each slave module with respect to the drive signal of the master based on the switching period, the total number of the converter modules and the delay time corresponding to each slave module comprises:

[0107] Step S4221, numbering each slave module according to the order of receiving the synchronization signal.

[0108] Specifically, the order of each slave module can be sorted according to the length of the connection line between each slave module and the master module, wherein the longer the length of the connection line, the later the order of receiving the synchronization signal, and the order of each slave module is sorted according to the length of the connection line from short to long, for example, the slave module with the shortest length of the connection line is slave module 1, the slave module with the second shortest length of the connection line is slave module 2, and so on.

[0109] It should be noted that if there are multiple slave modules corresponding to the same length of the connection line, the multiple slave modules with the same length of the connection line can be randomly sorted, for example, if there are three slave modules, two of which have the same length of the connection line and are shorter than the length of the connection line corresponding to the third slave module, one of the two slave modules with the same length of the connection line can be randomly selected as slave module 1, the other slave module as slave module 2, and the third slave module as slave module 3.

[0110] Step S4222, determining the phase shift time difference between each two adjacent converter modules according to the switching period and the total number of the converter modules.

[0111] Specifically, the total number of the converter modules is N, and the phase shift time difference between each two adjacent converter modules can be obtained by dividing the switching period by the total number of the converter modules, that is, Ts / N.

[0112] In step S4223, for any slave module j, the initial phase shift time of the drive signal of each of the transducers in the slave module j relative to the drive signal of the master is determined according to the phase shift time difference and the number of the slave module j.

[0113] Specifically, assuming that the order of the slave module j relative to the master module is j, i.e. the interval between the slave module and the master module is j, the number of the slave module j is multiplied by the phase shift time difference between each two adjacent transducer modules to obtain the initial phase shift time of the drive signal of the slave module j relative to the drive signal of the master, i.e. (Ts*j) / N.

[0114] In step S4224, the relative phase shift time of the drive signal of each of the transducers in the slave module j relative to the drive signal of the master is determined according to the initial phase shift time and the delay time corresponding to the slave module j.

[0115] Specifically, in order to avoid the influence of the delay time caused by signal transmission on the phase shift control accuracy, the initial phase shift time is subtracted by the corresponding delay time to obtain the relative phase shift time of the drive signal of each of the transducers in the slave module j relative to the drive signal of the master, and the time when the drive signal is received by each of the transducers in the slave module j is the same.

[0116] For example, assuming that the delay time of the slave module 1 is Δt1, the delay time of the slave module 2 is Δt2, and so on. The time lag of the drive signal of each of the transducers in the slave module 1 relative to the drive signal of the master is (Ts / N)-Δt1, which means that after the time (Ts / N)-Δt1 elapses from the first time when the synchronization signal is output by the master, each of the transducers in the slave module 1 starts to work; the time lag of the drive signal of each of the transducers in the slave module 2 relative to the drive signal of the master is (2*Ts / N)-Δt2, which means that after the time (2*Ts / N)-Δt2 elapses from the first time when the synchronization signal is output by the master, each of the transducers in the slave module 2 starts to work; and so on. The time lag of the drive signal of each of the transducers in the slave module n relative to the drive signal of the master is (n*Ts / N)-Δt n , which means that after the time (n*Ts / N)-Δt n elapses from the first time when the synchronization signal is output by the master, each of the transducers in the slave module n starts to work.

[0117] Optionally, the determining of the third phase difference of the drive signal of each of the transducers other than the target transducer in each of the slave modules relative to the drive signal of the corresponding target transducer based on the preset phase and the total number of the transducers included in each of the slave modules comprises:

[0118] Step S4231, for any slave module j, determining the number of each of the transducers in the slave module j other than the target transducer relative to the corresponding target transducer based on a preset rule;

[0119] Step S4232, determining a fourth phase difference between the driving signals of each two adjacent transducers in the slave module j according to the preset phase and the total number of transducers included in the slave module j;

[0120] Step S4233, for any transducer k in the slave module j other than the target transducer, determining the third phase difference of the driving signal of the transducer k relative to the driving signal of the target transducer in the slave module j according to the fourth phase difference and the number of the transducer k.

[0121] In the optional embodiment, the phase shift control is performed on each transducer module, so that the driving signals of each transducer module are uniformly phase-shifted in the switching period, and the phases of the driving signals of the plurality of transducers in each transducer module are uniformly distributed in the preset phase, effectively reducing the input current ripple of the switching power supply. Moreover, each transducer module can include a plurality of transducers, based on the ripple superposition principle, the more the number of phase-shifted interleaving, the smaller the input current ripple of the parallel module.

[0122] As shown in Figure 4 , it is assumed that a transducer module includes four transducers, and it should be noted that, for ease of observation, Figure 4 , only the input current waveforms of the first three transducers are drawn.

[0123] As shown in Figure 4 (b), the phase difference between the input current waveforms of the adjacent two transducers is small, i.e., the phases of the input current waveforms are concentrated, Figure 4 , after the input current waveforms of each transducer in (b) are superimposed, a waveform with large amplitude fluctuation in (a) is obtained; Figure 4 , after the input current waveforms of each transducer in (c) are superimposed, a sawtooth wave in (a) is obtained. Figure 4 (c) shows that the phase difference between the input current waveforms of the adjacent two transducers is 90°, i.e., the input current waveforms of each transducer are uniformly phase-shifted, Figure 4 , after the input current waveforms of each transducer in (c) are superimposed, a sawtooth wave in (a) is obtained. Figure 4 (c) shows that the phase difference between the input current waveforms of the adjacent two transducers is 90°, i.e., the input current waveforms of each transducer are uniformly phase-shifted, Figure 4 , after the input current waveforms of each transducer in (c) are superimposed, a sawtooth wave in (a) is obtained. Figure 4 , after the input current waveforms of each transducer in (c) are superimposed, a sawtooth wave in (a) is obtained. Figure 4(c) the current ripple of the current waveform obtained by superimposing the current waveforms of each converter in the converter module is small. Therefore, if the phases of the driving signals of each converter in a converter module are concentrated in a certain area, the input current ripple of the converter module will be large, and uniform phase shifting of each converter can reduce the input current ripple.

[0124] As shown in Figure 5 Another embodiment of the present application provides a switching power supply control device, the switching power supply comprising N converter modules in parallel, N≥2, each of the converter modules comprising a plurality of converters in staggered parallel, the switching power supply control device comprising:

[0125] a configuration module, configured to determine any one of the N converter modules as a master module, and determine the remaining converter modules except the master module as slave modules;

[0126] a processing module, configured to output a synchronization signal to each of the slave modules when receiving a control instruction, and determine a delay time corresponding to each of the slave modules according to a first time of outputting the synchronization signal and a second time of receiving the synchronization signal by each of the slave modules;

[0127] a control module, configured to perform phase shifting control on the master module, and perform phase shifting control on each of the slave modules based on the delay time, so that the driving signals of each of the converter modules and each of the converters in each of the converter modules are uniformly phase shifted in a preset period.

[0128] The switching power supply control device is used to implement the switching power supply control method as described above, and has the beneficial effects corresponding to the beneficial effects of the switching power supply control method, which will not be repeated here.

[0129] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, the program can include the processes of the above-mentioned embodiment methods. The storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM), a random access memory (RAM), or the like. In this application, the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present application. In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically independently, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0130] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A switching power supply control method characterized by comprising: The switching power supply comprises N parallel converter modules, N≥2, each of the converter modules comprising a plurality of converters in staggered parallel connection, and the switching power supply control method comprises the following steps: determining any one of the N converter modules as a master module, and taking the remaining converter modules except the master module as slave modules; when receiving a control instruction, outputting a synchronization signal to each of the slave modules; determining a delay time corresponding to each of the slave modules according to a first time of outputting the synchronization signal and a second time of receiving the synchronization signal by each of the slave modules; phase-shifting controlling the master module, including phase-shifting controlling each of the converters in the master module, and phase-shifting controlling each of the slave modules based on the delay time, including phase-shifting controlling each of the slave modules relative to the master module, and phase-shifting controlling each of the converters in the same slave module, so that the driving signals of each of the converter modules and each of the converters in each of the converter modules are uniformly phase-shifted in a preset period.

2. The switching power supply control method according to claim 1, characterized by, The preset period is a switching period.

3. The switching power supply control method according to claim 2, characterized by, The phase-shifting controlling the master module comprises the following steps: determining any one of the converters in the master module as a master, setting a phase-shifting time of a driving signal of each of the converters in the master module as a first reference time, and setting a phase of a driving signal of the master as a first reference phase; determining a first phase difference of a driving signal of each of the converters except the master relative to the driving signal of the master in the master module based on a preset phase and a total number of converters contained in the master module, the preset phase being 2π; controlling the master to act according to a driving signal with parameters of the first reference time and the first reference phase, and controlling each of the converters except the master in the master module to act according to a driving signal with parameters of the first reference time and the first phase difference.

4. The switching power supply control method according to claim 3, characterized by The determining a first phase difference of a driving signal of each of the converters except the master relative to the driving signal of the master in the master module based on a preset phase and a total number of converters contained in the master module comprises the following steps: determining a number of each of the converters except the master relative to the master based on a preset rule; determining a second phase difference between driving signals of each two adjacent converters in the master module according to the preset phase and the total number of converters contained in the master module; for any one of the converters i except the master in the master module, determining the first phase difference of the driving signal of the converter i relative to the driving signal of the master according to the second phase difference and the number of the converter i.

5. The switching power supply control method according to claim 3, wherein The phase-shifting controlling each of the slave modules based on the delay time comprises the following steps: determining any one of the converters in each of the slave modules as a target converter, and setting a phase of the target converter as a second reference phase; determining, based on the switching period, the total number of the converter modules, and the delay time corresponding to each slave module, a relative phase shift time of a driving signal of each converter in each slave module relative to a driving signal of the master; determining, based on the preset phase and the total number of the converters included in each slave module, a third phase difference of a driving signal of each converter in each slave module except the target converter relative to a driving signal of the corresponding target converter; controlling the target converter to act according to a driving signal with parameters of the relative phase shift time and the second reference phase, and controlling each converter in each slave module except the target converter to act according to a driving signal with parameters of the relative phase shift time and the third phase difference.

6. The switching power supply control method according to claim 5, wherein The method of determining, based on the switching period, the total number of the converter modules, and the delay time corresponding to each slave module, a relative phase shift time of a driving signal of each converter in each slave module relative to a driving signal of the master includes: numbering each slave module according to an order in which the slave module receives the synchronization signal; determining a phase shift time difference between every two adjacent converter modules according to the switching period and the total number of the converter modules; for any slave module j, determining an initial value of a phase shift time of a driving signal of each converter in the slave module j relative to a driving signal of the master according to the phase shift time difference and the number of the slave module j; determining the relative phase shift time of the driving signal of each converter in the slave module j relative to the driving signal of the master according to the initial value of the phase shift time and the delay time corresponding to the slave module j.

7. The switching power supply control method according to claim 5, wherein The method of determining, based on the preset phase and the total number of the converters included in each slave module, a third phase difference of a driving signal of each converter in each slave module except the target converter relative to a driving signal of the corresponding target converter includes: for any slave module j, determining the number of each converter in the slave module j relative to the corresponding target converter based on a preset rule; determining a fourth phase difference between driving signals of every two adjacent converters in the slave module j according to the preset phase and the total number of the converters included in the slave module j; for any converter k in the slave module j except the target converter, determining the third phase difference of the driving signal of the converter k relative to the driving signal of the target converter in the slave module j according to the fourth phase difference and the number of the converter k.

8. A switching power supply control device characterized by comprising: The switching power supply includes N converter modules connected in parallel, N≥2, each of the converter modules includes a plurality of converters connected in staggered parallel, and the switching power supply control device includes: The configuration module is configured to determine any one of the N converter modules as a master module and determine the remaining converter modules except the master module as slave modules. The processing module is configured to output a synchronization signal to each of the slave modules when receiving a control instruction, and determine a delay time corresponding to each of the slave modules according to a first time of outputting the synchronization signal and a second time of receiving the synchronization signal by each of the slave modules. The control module is configured to perform phase shift control on the master module, including performing phase shift control on each of the converters in the master module, and performing phase shift control on each of the slave modules based on the delay time, including controlling each of the slave modules to be phase shifted relative to the master module, and performing phase shift control on each of the converters in the same slave module, so that the driving signals of each of the converter modules and each of the converters in each of the converter modules are uniformly phase shifted within a preset period.

9. A power supply system characterized by comprising: The switching power supply control method according to any one of claims 1 to 7 is used for controlling a switching power supply including N parallel converter modules, N≥2, each of the converter modules including a plurality of converters in staggered parallel connection, a power input end of each of the converter modules being configured to be connected to an output end of an input source, and a power output end of each of the converter modules being configured to provide power for a load.

10. The power supply system of claim 9, wherein, The converter modules include one master module and N-1 slave modules, a signal input end of the master module being configured to receive a control instruction, and a signal output end of the master module being electrically connected to signal input ends of each of the slave modules.

11. The power supply system of claim 10, wherein, The signal output end of the master module is connected to each of the slave modules in sequence through twisted pair lines, or all of the slave modules are connected in parallel through twisted pair lines, and a common end formed by the signal input ends of all of the slave modules is electrically connected to the signal output end of the master module through twisted pair lines.

12. The power supply system of claim 10, wherein, The master module further includes a first control unit, a first single-ended operational amplifier and a differential operational amplifier, a driving signal output end of the first control unit being electrically connected to driving signal input ends of each of the converters in the master module, a signal input end of the first control unit being configured to receive a control instruction, a synchronization signal output end of the first control unit being electrically connected to an input end of the first single-ended operational amplifier, and an output end of the first single-ended operational amplifier being electrically connected to the signal input ends of each of the slave modules through the differential operational amplifier.

13. The power supply system of claim 12, wherein, The slave module further includes a second control unit and a second single-ended operational amplifier, a driving signal output end of the second control unit being electrically connected to driving signal input ends of each of the converters in the slave module, a synchronization signal input end of the second control unit being electrically connected to an output end of the second single-ended operational amplifier, and an input end of the second single-ended operational amplifier being electrically connected to the signal output end of the master module.

14. The power supply system according to any one of claims 9 to 13, characterized by The input source includes at least one of a fuel cell, a photovoltaic power generation device and a wind power generation device, and the converter includes at least one of a boost circuit and a buck circuit.

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