Short-circuit current limiting protection method for resonant converter, electronic device and storage medium

Abstract

The present invention relates to the field of power electronics control technology, and discloses a short-circuit current limiting protection method for a resonant converter, an electronic device, and a storage medium. The method comprises: obtaining a gain ratio of the resonant converter; and adjusting the current limiting-related parameters and the switching frequency of the resonant converter in real time based on the gain ratio, the obtained change in the gain ratio of the resonant converter, and the switching frequency; wherein the change in the gain ratio characterizes the corresponding relationship between the current limiting-related parameters and the gain ratio of the resonant converter. In the present invention, accurate and effective short-circuit current limiting protection is performed based on multi-dimensional short-circuit current limiting adjustment factors, which can meet the safety and reliability requirements of the power electronics industry.

Description

Technical Field

[0001] The present invention relates to the field of power electronic control technology, and in particular to a short-circuit current limiting protection method for a resonant converter, an electronic device, and a computer-readable storage medium. Background Art

[0002] With the continuous development of the power electronics industry, isolated resonant bidirectional DC-DC topologies, such as dual active bridge (DAB) converters and resonant DC-DC converters, are increasingly being used in battery charge and discharge testing, electric vehicle charging and discharging, UPS, and energy storage. When developing and designing products based on these topologies, short-circuit current limiting protection must be considered. Currently, the short-circuit current limiting adjustment methods available for isolated resonant bidirectional DC-DC topologies are relatively simple, resulting in poor short-circuit current limiting performance and difficulty meeting the safety and reliability requirements of the power electronics industry. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, the present invention provides a short-circuit current limiting protection method, electronic device, and storage medium for a resonant converter, which can accurately and effectively perform short-circuit current limiting protection and meet the safety and reliability requirements of the power electronics industry.

[0004] In a first aspect, an embodiment of the present invention provides a short-circuit current limiting protection method for a resonant converter, comprising:

[0005] Obtaining a gain ratio of the resonant converter;

[0006] According to the gain ratio and the acquired gain ratio change and switching frequency of the resonant converter, the current limiting associated parameters and the switching frequency of the resonant converter are adjusted in real time;

[0007] The gain ratio change represents the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio.

[0008] Optionally, in one embodiment of the present invention, when the resonant converter includes a primary full-bridge arm circuit and a secondary full-bridge arm circuit, the current limiting associated parameters include a primary phase shift angle and a secondary phase shift angle; and the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows:

[0009] ;

[0010] ;

[0011] in, is the primary side phase shift angle, is the secondary side phase shift angle, is the gain ratio, , is the primary bridge arm voltage, is the secondary bridge arm voltage.

[0012] Optionally, in one embodiment of the present invention, adjusting the current limiting-related parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and switching frequency of the resonant converter includes:

[0013] When it is determined that a short circuit occurs on the primary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary side phase shift angle is adjusted to 0, and the secondary side phase shift angle is adjusted according to the corresponding relationship between the secondary side phase shift angle and the gain ratio and the obtained real-time value of the gain ratio when the primary side is short-circuited, thereby increasing the switching frequency;

[0014] or,

[0015] When it is determined that a short circuit occurs on the secondary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary side phase shift angle is adjusted according to the correspondence between the primary side phase shift angle and the gain ratio and the real-time value of the gain ratio obtained when a short circuit occurs on the secondary side, and the secondary side phase shift angle is adjusted to 0 to increase the switching frequency.

[0016] Optionally, in one embodiment of the present invention, when the resonant converter includes a primary half-bridge arm circuit and a secondary full-bridge arm circuit, the current limiting associated parameters include a primary duty cycle and a secondary phase shift angle; and the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows:

[0017] ;

[0018] ;

[0019] in, is the primary duty cycle, is the secondary side phase shift angle, is the gain ratio, , is the primary bridge arm voltage, is the secondary bridge arm voltage.

[0020] Optionally, in one embodiment of the present invention, adjusting the current limiting-related parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and switching frequency of the resonant converter includes:

[0021] When it is determined that a short circuit occurs on the primary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary side duty cycle is adjusted to 50%, and the secondary side phase shift angle is adjusted according to the corresponding relationship between the secondary side phase shift angle and the gain ratio and the obtained real-time value of the gain ratio when the primary side is short-circuited, thereby increasing the switching frequency;

[0022] or,

[0023] When it is determined that a short circuit occurs on the secondary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary duty cycle is adjusted according to the correspondence between the primary duty cycle and the gain ratio and the real-time value of the gain ratio obtained when a short circuit occurs on the secondary side, the secondary phase shift angle is adjusted to 0, and the switching frequency is increased.

[0024] Optionally, in one embodiment of the present invention, when the resonant converter includes a primary full-bridge arm circuit and a secondary half-bridge arm circuit, the current limiting associated parameters include a primary phase shift angle and a secondary duty cycle; and the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows:

[0025] ;

[0026] ;

[0027] in, is the primary side phase shift angle, is the secondary side duty cycle, is the gain ratio, , is the primary bridge arm voltage, is the secondary bridge arm voltage.

[0028] Optionally, in one embodiment of the present invention, adjusting the current limiting-related parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and switching frequency of the resonant converter includes:

[0029] When it is determined that a short circuit occurs on the primary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, adjusting the primary side phase shift angle to 0, adjusting the secondary side duty cycle to 0, and increasing the switching frequency;

[0030] or,

[0031] When it is determined that a short circuit occurs on the secondary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary side phase shift angle is adjusted according to the correspondence between the primary side phase shift angle and the gain ratio and the real-time value of the gain ratio obtained when the secondary side is short-circuited, and the secondary side duty cycle is adjusted to 50% to increase the switching frequency.

[0032] Optionally, in one embodiment of the present invention, increasing the switching frequency is achieved by the following steps:

[0033] The switching frequency is closed-loop regulated based on a preconfigured current limiting loop.

[0034] In a second aspect, an embodiment of the present invention provides an electronic device, including:

[0035] at least one processor;

[0036] at least one memory for storing at least one program;

[0037] When at least one of the programs is executed by at least one of the processors, the short-circuit current limiting protection method for the resonant converter as described in the first aspect is implemented.

[0038] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium storing a program executable by a processor, wherein the program executable by the processor is used to implement the short-circuit current limiting protection method of the resonant converter as described in the first aspect when executed by the processor.

[0039] The short-circuit current limiting protection method, electronic device and storage medium of the resonant converter proposed in the present invention obtain the gain ratio of the resonant converter and determine the corresponding relationship between the current limiting associated parameter of the resonant converter and the gain ratio, and use it as at least one short-circuit current limiting adjustment factor of the effective value of the excitation source, and use the obtained switching frequency of the resonant converter as another short-circuit current limiting adjustment factor to increase the resonant cavity impedance, thereby accurately and effectively performing short-circuit current limiting protection based on multi-dimensional short-circuit current limiting adjustment factors, which can meet the safety and reliability requirements of the power electronics industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of a short-circuit current limiting protection method for a resonant converter provided by one embodiment of the present invention;

[0041] FIG2( a ) is a schematic diagram of an isolated resonant bidirectional DC-DC topology provided with a primary full-bridge arm circuit according to an embodiment of the present invention;

[0042] FIG2( b ) is a schematic diagram of an isolated resonant bidirectional DC / DC topology provided with a hysteresis bridge arm of a primary half-bridge arm circuit according to an embodiment of the present invention;

[0043] FIG2( c ) is a schematic diagram of an isolated resonant bidirectional DC-DC topology provided with a leading bridge arm of a primary half-bridge arm circuit according to an embodiment of the present invention;

[0044] FIG3( a ) is a schematic diagram of an isolated resonant bidirectional DC-DC topology provided with a secondary full-bridge arm circuit according to an embodiment of the present invention;

[0045] FIG3( b ) is a schematic diagram of an isolated resonant bidirectional DC / DC topology provided with a lagging bridge arm of a secondary half-bridge arm circuit according to an embodiment of the present invention;

[0046] FIG3( c ) is a schematic diagram of an isolated resonant bidirectional DCDC topology provided with a leading bridge arm of a secondary half-bridge arm circuit according to an embodiment of the present invention;

[0047] Figure 4 is a circuit diagram of a resonant converter provided by one embodiment of the present invention;

[0048] Figure 5 yes Figure 4 The equivalent circuit diagram of the resonant converter in FIG.

[0049] FIG6 (a) is a graph showing the relationship between the primary side phase shift angle and the gain ratio according to an embodiment of the present invention;

[0050] FIG6( b ) is a graph showing the relationship between the secondary side phase shift angle and the gain ratio according to an embodiment of the present invention;

[0051] Figure 7 is a graph showing the relationship between the resonant cavity impedance and the switching frequency provided by an embodiment of the present invention;

[0052] Figure 8 1 is a control schematic diagram of a current limiting loop provided by an embodiment of the present invention;

[0053] Figure 9(a) is Figure 4 Schematic diagram of curves showing the changes of various operating parameters of the resonant converter over time when the low-voltage side is short-circuited;

[0054] Figure 9(b) is Figure 4 Schematic diagram of curves showing the changes of various operating parameters of the resonant converter over time when the high-voltage side is short-circuited;

[0055] Figure 10 is a circuit diagram of a resonant converter provided by another embodiment of the present invention;

[0056] Figure 11 is a graph showing the relationship between the primary duty cycle and the gain ratio provided by an embodiment of the present invention;

[0057] Figure 12(a) is Figure 10 Schematic diagram of curves showing the changes of various operating parameters of the resonant converter over time when the low-voltage side is short-circuited;

[0058] Figure 12(b) is Figure 10 Schematic diagram of curves showing the changes of various operating parameters of the resonant converter over time when the high-voltage side is short-circuited;

[0059] Figure 13 is a circuit diagram of a resonant converter provided by another embodiment of the present invention;

[0060] Figure 14 This is a structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0062] It should be noted that although the functional modules are divided in the device schematic and the logical order is shown in the flowchart, in some cases, the steps shown or described can be performed in a different order than the module division in the device or the order in the flowchart.

[0063] Figure 1 This is a flow chart of a short-circuit current limiting protection method for a resonant converter provided by an embodiment of the present invention. Figure 1 As shown, the short-circuit current limiting protection method of the resonant converter may include but is not limited to steps S1000 to S2000.

[0064] Step S1000: obtaining a gain ratio of the resonant converter;

[0065] Step S2000: adjusting the current limiting related parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and switching frequency of the resonant converter;

[0066] The gain ratio change represents the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio.

[0067] In this step, by obtaining the gain ratio of the resonant converter and determining the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio, it is used as at least one short-circuit current limiting adjustment factor of the effective value of the excitation source, and the switching frequency of the resonant converter is used as another short-circuit current limiting adjustment factor to increase the resonant cavity impedance, thereby accurately and effectively performing short-circuit current limiting protection based on multi-dimensional short-circuit current limiting adjustment factors, which can meet the safety and reliability requirements of the power electronics industry.

[0068] In one embodiment, the types and parameter specifications of the resonant converter can be various, which are not limited here. Those skilled in the art can select a suitable resonant converter for application according to actual application requirements. The specific topologies of various isolated resonant bidirectional DCDC topologies are described below, and their application as the short-circuit current limiting protection method of the resonant converter provided in this embodiment is used to illustrate the principle, but it should not be understood as any limitation to this embodiment.

[0069] The resonant converter may include, but is not limited to, a primary DC (power supply or load), a primary bridge arm, a resonant cavity, a transformer, a secondary bridge arm, and a secondary DC (power supply or load). The resonant cavity may be arranged on the primary side of the transformer or the secondary side of the transformer, which does not affect the following embodiments. The primary side resonant cavity is used as an example for explanation. The primary bridge arm may be a primary full-bridge arm circuit or a primary half-bridge arm circuit. The primary full-bridge arm circuit is shown in FIG2 (a). The primary half-bridge arm circuit can be divided into FIG2 according to the position of the power switch tube. 2 (b) and 2 (c), wherein FIG2 (b) corresponds to the lagging bridge arm situation of the primary half-bridge arm circuit, and FIG2 (c) corresponds to the leading bridge arm situation of the primary half-bridge arm circuit. In FIG2 (b) and FIG2 (c), Cr1 and Cr2 both participate in the resonance as resonant capacitors. Similarly, the secondary bridge arm can also be a secondary full-bridge arm circuit or a secondary half-bridge arm circuit. Different situations can be referred to FIG3 (a), FIG3 (b) and FIG3 (c) respectively. The principle is similar to that of the primary bridge arm and will not be described here.

[0070] like Figure 4 As shown, the resonant converter may include, but is not limited to, a primary full-bridge arm circuit and a secondary full-bridge arm circuit. The primary side of the transformer is defined as the high-voltage side, and the voltage is ; The secondary side is the low voltage side, and the voltage is ; S1, S2, S3, S4 and Q1, Q2, Q3, Q4 are all MOSFET switches, the four D1s on the primary side and the four D2s on the secondary side are diodes, CS1, CS2, CS3, CS4 and CQ1, CQ2, CQ3, CQ4 are all capacitors, Cbus is the high-voltage side capacitor, Cbat is the low-voltage side capacitor, the transformer ratio is N, Lr and Cr are the resonant inductor and resonant capacitor respectively; then the gain ratio can be obtained as , the phase shift angle between S1 and S4 is the primary phase shift angle , the phase shift angle between Q1 and Q4 is the secondary side phase shift angle , the resonant cavity current is , positive from high pressure side to low pressure side.

[0071] It can be understood that the resonant converter in this case can be equivalent to the primary bridge arm voltage , secondary bridge arm voltage and the resonant cavity impedance , specifically Figure 5 As shown, it can be seen that when the high voltage side voltage is close to zero and When it is a very large negative value, it can be judged that the high voltage side is short-circuited. Can effectively reduce the secondary bridge arm voltage , thereby reducing the voltage acting on the resonant device to achieve the purpose of reducing the current; when the low-voltage side voltage is close to zero and When it is a large positive value, it is judged that the low-voltage side is short-circuited. Can effectively reduce the primary bridge arm voltage , thereby reducing the voltage acting on the resonant device to achieve the purpose of reducing the current.

[0072] In one embodiment, corresponding to Figure 4 The corresponding relationship between the current limiting parameters and the gain ratio of the resonant converter shown is monotonic and can be a linear or nonlinear relationship. It is set by those skilled in the art according to the actual scenario requirements and is not limited here. For example, the corresponding relationship between the current limiting parameters and the gain ratio of the resonant converter can be, but is not limited to, as shown in Figures 6 (a) and 6 (b). Figure 6 (a) is and The corresponding relationship of , Figure 6 (b) is and The corresponding relationship is as follows:

[0073] ;

[0074] ;

[0075] It can be seen that due to , when a short circuit occurs on the high voltage side, gradually tends to infinity, and now it is obvious ,Will Adjust to 0, and at the same time according to the collected data in the short circuit situation The real-time value is combined with the above corresponding relationship to determine The real-time value of Theoretically, when gradually tends to infinity, tend to , but in actual process, There is usually an upper limit (such as set to around 100), then correspondingly, Reach a corresponding less than When a short circuit occurs on the low voltage side, gradually tends to infinitesimal, and it is obvious at this time , according to the above similar analysis principle, at this time Adjust to 0, and according to the collected data in the short circuit situation The real-time value is combined with the above corresponding relationship to determine The real-time value of Theoretically, when gradually tends to infinitesimal, tend to , but in actual process, There is usually a lower limit, so correspondingly, Reach a corresponding less than The upper limit value of .

[0076] like Figure 7 As shown, according to the SRC impedance characteristics, when the switching frequency of the resonant converter is Greater than the resonant frequency of the resonant converter , the resonant cavity impedance gradually increases with the switching frequency. Then, when a short circuit occurs on the high-voltage side or the low-voltage side, the resonant cavity impedance can be increased by increasing the switching frequency, thereby suppressing the short-circuit current. Increasing the switching frequency can be achieved by, but is not limited to, closed-loop regulation of the switching frequency based on a pre-configured current limiting loop, such as Figure 8 As shown, by designing the current limiting loop to achieve the switching frequency control, where is the upper limit of current limiting, is the lower current limit value, and As a loop controller, in actual process, the switching frequency is calculated in real time by the current limiting loop The real-time value of the switching frequency is adjusted according to the real-time value. Real-time adjustment is performed. Since the current limiting loop is well known to those skilled in the art, it will not be described here in order to avoid redundancy. The "increasing the switching frequency" in the following embodiments can also be achieved by controlling the current limiting loop. The basic principle is the same and will not be described in detail later.

[0077] Referring to FIG9(a), FIG9(a) shows Figure 4 The curve diagram of the resonant converter in the low-voltage side short circuit condition shows the change of various operating parameters over time. It can be seen from the curve diagram that after the short-circuit adjustment shown in the above embodiment, the final tends to 0, tends to a positive stable value, tend to , tends to 0, increases to a stable value less than the maximum switching frequency; Figure 9(b) shows Figure 4 The curve diagram of the resonant converter in the case of high-voltage side short circuit changes with time, from which it can be seen that after the short-circuit adjustment shown in the above embodiment, the final tends to 0, tends to a negative stable value, tends to 0, tend to , Increase to a frequency less than the maximum switching frequency stable value.

[0078] like Figure 10 As shown, the resonant converter may include, but is not limited to, a primary half-bridge arm circuit and a secondary full-bridge arm circuit, and its circuit structure is similar to Figure 4 Similar, the only difference is that the primary half-bridge arm circuit is used to replace Figure 4 The primary full-bridge arm circuit in ,therefore , since there is only one bridge arm on the primary side, the primary side cannot achieve phase shift, that is, It is always equal to 0, but the duty cycle of the primary side power switch tubes S3 and S4 can still be adjusted Realize The control of the current limiting parameters at this time includes and For example, the corresponding relationship between the current limiting associated parameters and the gain ratio of the resonant converter can be, but is not limited to, as follows: Figure 11 , as shown in Figure 6(b), Figure 11 for and The corresponding relationship of , Figure 6 (b) is and The corresponding relationship is as follows:

[0079] ;

[0080] ;

[0081] It can be seen that the combination Figure 7 As shown, when it is determined that the primary side of the resonant converter is short-circuited and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the switching frequency is increased. Adjust to 50%, and according to the data collected in the short circuit situation The real-time value is combined with the above corresponding relationship to determine The real-time value of Theoretically, when gradually tends to infinity, tend to , but in actual process, There is usually an upper limit (such as set to around 100), then correspondingly, Reach a corresponding less than When it is determined that the secondary side of the resonant converter is short-circuited and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, Adjust to 0, increase the switching frequency, and at the same time, according to the data collected in the short circuit situation The real-time value is combined with the above corresponding relationship to determine The real-time value of Theoretically, when gradually tends to infinitesimal, tends to 0, but in practice, There is usually a lower limit, so correspondingly, reaches a corresponding lower limit value greater than 0.

[0082] Referring to FIG12(a), FIG12(a) shows Figure 10 The curve diagram of the resonant converter in the low-voltage side short circuit condition shows the change of various operating parameters over time. It can be seen from the curve diagram that after the short-circuit adjustment shown in the above embodiment, the final tends to 0, tends to a positive stable value, tends to 0, tends to 0, increases to a stable value less than the maximum switching frequency; Figure 12 (b) shows Figure 10 The curve diagram of the resonant converter in the case of high-voltage side short circuit changes with time, from which it can be seen that after the short-circuit adjustment shown in the above embodiment, the final tends to 0, tends to a negative stable value, Approaching 50%, tend to , Increase to a frequency less than the maximum switching frequency stable value.

[0083] In one embodiment, the resonant converter may include, but is not limited to, a primary full-bridge arm circuit and a secondary half-bridge arm circuit, and its circuit structure is similar to Figure 4 Similar, the only difference is that the secondary half-bridge arm circuit is used instead Figure 4 The structure of the secondary full-bridge arm circuit in the circuit is not described here; similarly, the current limiting parameters at this time include and secondary duty cycle , the corresponding relationship between the current limiting associated parameters and the gain ratio of the resonant converter can be, but is not limited to, as follows:

[0084] ;

[0085] ;

[0086] It can be seen that the combination Figure 7 As shown, when it is determined that the primary side of the resonant converter is short-circuited and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, gradually tends to infinity, then Adjust to 0, and because of this situation Exceeds the limit, so Adjust to 0 and increase the switching frequency; when it is determined that the secondary side of the resonant converter is short-circuited and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, Adjust to 50%, increase the switching frequency, and according to the data collected in the short circuit situation The real-time value is combined with the above corresponding relationship to determine The real-time value of Theoretically, when gradually tends to infinitesimal, tend to , but in actual process, There is usually a lower limit, so correspondingly, Reach a corresponding less than The upper limit value of .

[0087] It should be noted that the short-circuit current limiting protection method of the single-phase primary half-bridge and secondary full-bridge resonant converter shown in Figures 12 (a) and 12 (b) is also applicable to the three-phase primary half-bridge and secondary full-bridge resonant converter. Specifically, refer to Figure 13 Arm A includes switches S1 and S2, which together with the secondary sides Qa1 to Qa4 form phase A. Arm B includes switches S3 and S4, which together with the secondary sides Qb1 to Qb4 form phase B. Arm C includes switches S5 and S6, which together with the secondary sides Qc1 to Qc4 form phase C. The three phases are staggered 120 degrees.

[0088] In this topology, , so the gain ratio is ;

[0089] It can be seen that the three-phase primary half-bridge and secondary full-bridge resonant converter can be equivalent to three single-phase primary half-bridge and secondary full-bridge resonant converters. The short-circuit current limiting protection method of the resonant converter shown in the above embodiments is also applicable to this topology, that is, obtaining the gain ratio ( 、 and ),according to 、 and Get the primary side duty cycle 、 、 and secondary side phase shift angle 、 、 , the three phases are shifted by 120 degrees, and the primary duty cycle 、 、 and secondary side phase shift angle 、 、 The adjustment method can refer to the above Figure 10 The relevant embodiments of the resonant converter shown are not described here in detail; and combined with the current limiting loop given in the above embodiment, the switching frequency is synchronously closed-loop adjusted so that the three-phase switching frequency is the same, thereby achieving the purpose of accurately controlling the current after a short circuit.

[0090] Similarly, the three-phase primary full-bridge and secondary half-bridge resonant converter can be equivalent to three single-phase primary full-bridge and secondary half-bridge resonant converters, and the three-phase primary full-bridge and secondary full-bridge resonant converter can be equivalent to three single-phase primary full-bridge and secondary full-bridge resonant converters. Corresponding short-circuit current limiting protection can also be performed according to the aforementioned embodiments, which will not be elaborated here.

[0091] Figure 14 FIG. 1 is a schematic diagram of the structure of an electronic device 1000 provided by an embodiment of the present invention. Figure 14 As shown, the electronic device 1000 includes a memory 1100 and a processor 1200. The number of the memory 1100 and the processor 1200 can be one or more. Figure 14 In the embodiment, a memory 1100 and a processor 1200 are taken as an example; the memory 1100 and the processor 1200 in the device can be connected via a bus or other means. Figure 14 In this example, a bus connection is used. Memory 1100, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the short-circuit current limiting protection method for a resonant converter provided in any embodiment of the present invention. Processor 1200 implements the short-circuit current limiting protection method for a resonant converter by executing the software programs, instructions, and modules stored in memory 1100.

[0092] The memory 1100 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function. In addition, the memory 1100 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 1100 may further include a memory remotely located relative to the processor 1200, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0093] An embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the short-circuit current limiting protection method for a resonant converter provided in any embodiment of the present invention.

[0094] An embodiment of the present invention further provides a computer program product, including a computer program or computer instructions, wherein the computer program or computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions, so that the computer device performs the short-circuit current limiting protection method for a resonant converter provided in any embodiment of the present invention.

[0095] The electronic devices and application scenarios described in the embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. Those skilled in the art will appreciate that with the evolution of electronic devices and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

[0096] Those skilled in the art will appreciate that all or some of the steps in the methods, systems, and functional modules / units in the devices disclosed above may be implemented as software, firmware, hardware, or appropriate combinations thereof.

[0097] In hardware implementations, the division between functional modules / units mentioned in the above description does not necessarily correspond to the division between physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is well known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0098] As used in this specification, the terms "component," "module," "system," and the like are used to refer to computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside in a process or execution thread, and a component can be located on a single computer or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures stored thereon. Components can communicate, for example, via local or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component on a local system, a distributed system, or a network, such as the Internet interacting with other systems via signals).

Claims

1. A short-circuit current limiting protection method for a resonant converter, characterized in that: include: Obtaining a gain ratio of the resonant converter; According to the gain ratio and the acquired gain ratio change and switching frequency of the resonant converter, the current limiting associated parameters and the switching frequency of the resonant converter are adjusted in real time; The gain ratio change represents the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio; When the resonant converter includes a primary full-bridge arm circuit and a secondary full-bridge arm circuit, the current limiting associated parameters include a primary phase shift angle and a secondary phase shift angle, and the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows: Among them, α pri is the primary phase shift angle, α sex is the secondary side phase shift angle, M is the gain ratio, M=V s / V p , V p is the primary bridge arm voltage, V s is the secondary bridge arm voltage; The adjusting the current limiting related parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and switching frequency of the resonant converter includes: When it is determined that a short circuit occurs on the primary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary side phase shift angle is adjusted to 0, and the secondary side phase shift angle is adjusted according to the corresponding relationship between the secondary side phase shift angle and the gain ratio and the obtained real-time value of the gain ratio when the primary side is short-circuited, thereby increasing the switching frequency; or, When it is determined that a short circuit occurs on the secondary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary side phase shift angle is adjusted according to the correspondence between the primary side phase shift angle and the gain ratio and the real-time value of the gain ratio obtained when a short circuit occurs on the secondary side, and the secondary side phase shift angle is adjusted to 0 to increase the switching frequency.

2. The short-circuit current limiting protection method for a resonant converter according to claim 1, wherein: When the resonant converter includes a primary half-bridge arm circuit and a secondary full-bridge arm circuit, the current limiting related parameters include a primary duty cycle and a secondary phase shift angle; the corresponding relationship between the current limiting related parameters of the resonant converter and the gain ratio is as follows: Among them, D pri is the primary duty cycle, α sec is the secondary side phase shift angle, M is the gain ratio, M=V s / V p , V p is the primary bridge arm voltage, V s is the secondary bridge arm voltage.

3. The short-circuit current limiting protection method for a resonant converter according to claim 2, wherein: The adjusting the current limiting related parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and switching frequency of the resonant converter includes: When it is determined that a short circuit occurs on the primary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary side duty cycle is adjusted to 50%, and the secondary side phase shift angle is adjusted according to the corresponding relationship between the secondary side phase shift angle and the gain ratio and the obtained real-time value of the gain ratio when the primary side is short-circuited, thereby increasing the switching frequency; or, When it is determined that a short circuit occurs on the secondary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary duty cycle is adjusted according to the correspondence between the primary duty cycle and the gain ratio and the real-time value of the gain ratio obtained when a short circuit occurs on the secondary side, the secondary phase shift angle is adjusted to 0, and the switching frequency is increased.

4. The short-circuit current limiting protection method for a resonant converter according to claim 1, wherein: When the resonant converter includes a primary full-bridge arm circuit and a secondary half-bridge arm circuit, the current limiting associated parameters include a primary phase shift angle and a secondary duty cycle; the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows: Among them, α pri is the primary side phase shift angle, D sec is the secondary duty cycle, M is the gain ratio, M=V s / V p , V p is the primary bridge arm voltage, V s is the secondary bridge arm voltage.

5. The short-circuit current limiting protection method for a resonant converter according to claim 4, characterized in that: The adjusting the current limiting related parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and switching frequency of the resonant converter includes: When it is determined that a short circuit occurs on the primary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, adjusting the primary side phase shift angle to 0, adjusting the secondary side duty cycle to 0, and increasing the switching frequency; or, When it is determined that a short circuit occurs on the secondary side of the resonant converter and the switching frequency of the resonant converter is greater than the resonant frequency of the resonant converter, the primary side phase shift angle is adjusted according to the correspondence between the primary side phase shift angle and the gain ratio and the real-time value of the gain ratio obtained when the secondary side is short-circuited, and the secondary side duty cycle is adjusted to 50% to increase the switching frequency.

6. The short-circuit current limiting protection method for a resonant converter according to claim 1, wherein: Increasing the switching frequency is achieved by the following steps: The switching frequency is closed-loop regulated based on a preconfigured current limiting loop.

7. An electronic device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When at least one of the programs is executed by at least one of the processors, the short-circuit current limiting protection method for the resonant converter according to any one of claims 1 to 6 is implemented.

8. A computer-readable storage medium, characterized in that A program executable by a processor is stored therein, and when the program executable by the processor is executed by the processor, it is used to implement the short-circuit current limiting protection method of the resonant converter according to any one of claims 1 to 6.

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