Short-circuit current-limiting protection method of resonant converter, electronic equipment and storage medium

Abstract

The invention relates to the technical field of power electronic control, and discloses a short-circuit current-limiting protection method of a resonant converter, electronic equipment and a storage medium, and the method comprises the steps: obtaining a gain ratio of the resonant converter; according to the gain ratio and the obtained gain ratio change condition and switching frequency of the resonant converter, the current limiting correlation parameter and the switching frequency of the resonant converter are adjusted in real time; wherein the change condition of the gain ratio represents the corresponding relation between the current-limiting correlation parameter and the gain ratio of the resonant converter. According to the invention, accurate and effective short-circuit current-limiting protection is carried out based on a multi-dimensional short-circuit current-limiting adjusting factor, and the safety and reliability requirements of the power electronic industry can be met.

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 DCDC topologies, such as dual active bridge (DAB) converters and resonant DCDC converters, are increasingly used in battery charge and discharge testing, electric vehicle charge and discharge, UPS, and energy storage. When developing and designing products based on the above topologies, short-circuit current limiting protection issues need to be considered. At present, the short-circuit current limiting adjustment methods for isolated resonant bidirectional DCDC topologies on the market are relatively simple, resulting in poor short-circuit current limiting effects and difficulty in meeting the safety and reliability requirements of the power electronics industry. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the present invention proposes a short-circuit current limiting protection method, an electronic device and a 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: 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 parameter of the resonant converter and the gain ratio.

[0005] 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; the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows: ; ; in, is the primary 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.

[0006] Optionally, in one embodiment of the present invention, the real-time adjustment of the current limiting associated parameters and the switching frequency of the resonant converter according to the gain ratio and the acquired gain ratio change and the 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 real-time value of the gain ratio obtained when the primary side is short-circuited, so as to increase 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 phase shift angle is adjusted to 0, thereby increasing the switching frequency.

[0007] 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; the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows: ; ; 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.

[0008] Optionally, in one embodiment of the present invention, the real-time adjustment of the current limiting associated parameters and the switching frequency of the resonant converter according to the gain ratio and the acquired gain ratio change and the 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 real-time value of the gain ratio when the primary side is short-circuited, so as to increase 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 corresponding relationship between the primary duty cycle and the gain ratio and the real-time value of the gain ratio obtained when the secondary side is short-circuited, the secondary phase shift angle is adjusted to 0, and the switching frequency is increased.

[0009] 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; the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows: ; ; in, is the primary phase shift angle, is the secondary duty cycle, is the gain ratio, , is the primary bridge arm voltage, is the secondary bridge arm voltage.

[0010] Optionally, in one embodiment of the present invention, the real-time adjustment of the current limiting associated parameters and the switching frequency of the resonant converter according to the gain ratio and the acquired gain ratio change and the 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%, thereby increasing the switching frequency.

[0011] Optionally, in one embodiment of the present invention, increasing the switching frequency is achieved by the following steps: The switching frequency is closed-loop regulated based on a preconfigured current limiting loop.

[0012] In a second aspect, an embodiment of the present invention provides an electronic device, including: 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 as described in the first aspect is implemented.

[0013] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a program executable by a processor, 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 as described in the first aspect.

[0014] 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, which 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 for increasing the impedance of the resonant cavity, 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

[0015] Figure 1 is a flow chart of a short-circuit current limiting protection method for a resonant converter provided by an embodiment of the present invention; FIG2 (a) is a schematic diagram of an isolated resonant bidirectional DCDC topology provided with a primary full-bridge arm circuit according to an embodiment of the present invention; FIG2( b ) is a schematic diagram of an isolated resonant bidirectional DCDC topology provided with a lagging bridge arm of a primary half-bridge arm circuit according to an embodiment of the present invention; FIG2( c ) is a schematic diagram of an isolated resonant bidirectional DCDC topology provided with a leading bridge arm of a primary half-bridge arm circuit according to an embodiment of the present invention; FIG3 (a) is a schematic diagram of an isolated resonant bidirectional DCDC topology provided with a secondary full-bridge arm circuit according to an embodiment of the present invention; FIG3( b ) is a schematic diagram of an isolated resonant bidirectional DCDC topology provided with a lagging bridge arm of a secondary half-bridge arm circuit according to an embodiment of the present invention; 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; Figure 4 is a circuit schematic diagram of a resonant converter provided by an embodiment of the present invention; Figure 5 yes Figure 4 The equivalent circuit schematic diagram of the resonant converter in FIG. FIG6 (a) is a curve relationship diagram between the primary side phase shift angle and the gain ratio provided by an embodiment of the present invention; FIG6( b ) is a curve relationship diagram between the secondary side phase shift angle and the gain ratio provided by an embodiment of the present invention; Figure 7 is a curve relationship diagram between the resonant cavity impedance and the switching frequency provided by an embodiment of the present invention; Figure 8 is a control schematic diagram of a current limiting loop provided by an embodiment of the present invention; Figure 9(a) is Figure 4 A 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; Figure 9(b) is Figure 4 A 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; Fig.10 is a circuit schematic diagram of a resonant converter provided by another embodiment of the present invention; Fig.11 is a curve relationship diagram between the primary duty cycle and the gain ratio provided by an embodiment of the present invention; Figure 12 (a) is Fig.10 A 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; Figure 12(b) is Fig.10 A 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; Fig.13 is a circuit schematic diagram of a resonant converter provided by another embodiment of the present invention; Fig.14 It is a structural schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 used to limit the present invention.

[0017] 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 may be performed in a different order than the module division in the device or the order in the flowchart.

[0018] Figure 1 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.

[0019] Step S1000, obtaining a gain ratio of the resonant converter; Step S2000, adjusting the current limiting associated 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; The gain ratio variation represents the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio.

[0020] 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, which is used as at least one short-circuit current limiting adjustment factor of the effective value of the excitation source, and using the obtained switching frequency of the resonant converter as another short-circuit current limiting adjustment factor for increasing the resonant cavity impedance, 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.

[0021] 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 the principle is explained by using the application of the short-circuit current limiting protection method of the resonant converter provided in this embodiment, but it should not be understood as any limitation on this embodiment.

[0022] 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. This does not affect the subsequent embodiments. 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 may be divided into FIG2 according to the position of the power switch tube. There are two cases, Figure 2 (b) and Figure 2 (c), where Figure 2 (b) corresponds to the lagging bridge arm situation of the primary half-bridge arm circuit, and Figure 2 (c) corresponds to the leading bridge arm situation of the primary half-bridge arm circuit. In Figure 2 (b) and Figure 2 (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 Figure 3 (a), Figure 3 (b) and Figure 3 (c) respectively. The principle is similar to that of the primary bridge arm and will not be repeated here.

[0023] 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, and 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 all 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.

[0024] 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 , such as 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 voltage on the low-voltage side is close to zero and When it is a large positive value, it is judged that the low-voltage side is short-circuited. At this time, by increasing 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.

[0025] In one embodiment, corresponding to Figure 4 The corresponding relationship between the current limiting associated 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 scene requirements and is not limited here. 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 shown in Figure 6 (a) and Figure 6 (b). Figure 6 (a) is and The corresponding relationship of and The corresponding relationship is as follows: ; ; It can be seen that due to , when a short circuit occurs on the high voltage side, gradually tends to infinity, and it is obvious that ,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 practice, 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 that 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 practice, There is usually a lower limit, so correspondingly, Reach a corresponding less than The upper limit value of .

[0026] like Figure 7 As shown, according to the SRC impedance characteristics, when the switching frequency of the resonant converter Greater than the resonant frequency of the resonant converter , the resonance 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 resonance 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 preconfigured current limiting loop, such as Figure 8 As shown, by designing the current limiting loop to achieve the switching frequency of control, where is the upper limit of current limiting, is the lower current limit, 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 to avoid redundancy. The "increasing the switching frequency" in the following embodiments can also be controlled and implemented by the current limiting loop. The basic principle is the same and will not be described in detail later.

[0027] Referring to FIG. 9( a ), FIG. 9( a ) shows Figure 4 The schematic diagram of the curve of the resonant converter in the case of short circuit on the low voltage side 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 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 schematic diagram of the curve of the resonant converter in the case of short circuit on the high voltage side 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.

[0028] like Fig.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 primary duty cycle of the power switch tubes S3 and S4 on the primary side can still be adjusted Realize The control of current limiting parameters at this time includes and For example, the corresponding relationship between the current limiting associated parameter of the resonant converter and the gain ratio can be, but is not limited to, as follows: Fig.11 , as shown in Figure 6(b), Fig.11 for and The corresponding relationship of and The corresponding relationship is as follows: ; ; It can be seen that the combination Figure 7 As shown, 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 switching frequency is increased. Adjust to 50%, 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 infinity, tend to , but in actual practice, There is usually an upper limit (such as set to around 100), then correspondingly, Reach a corresponding less than 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, 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.

[0029] Referring to FIG. 12( a ), FIG. 12( a ) shows Fig.10 The schematic diagram of the curve of the resonant converter in the case of short circuit on the low voltage side 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 positive stable value, tends to 0, tends to 0, increases to a stable value less than the maximum switching frequency; Figure 12 (b) shows Fig.10 The schematic diagram of the curve of the resonant converter in the case of short circuit on the high voltage side 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.

[0030] 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 to replace Figure 4 The structure of the secondary full bridge arm circuit in the circuit is not described here; similarly, the current limiting related parameters at this time include and secondary duty cycle , the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio can be, but is not limited to, as follows: ; ; 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 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, Adjust to 50%, increase the switching frequency, and according to the collected short-circuit conditions 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 practice, There is usually a lower limit, so correspondingly, Reach a corresponding less than The upper limit value of .

[0031] 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 FIG. 12 (a) and FIG. 12 (b) is also applicable to the three-phase primary half-bridge and secondary full-bridge resonant converter. Specifically, refer to Fig.13Arm A includes switch tubes S1 and S2, which together with the secondary side Qa1~Qa4 form phase A; arm B includes switch tubes S3 and S4, which together with the secondary side Qb1~Qb4 form phase B; arm C includes switch tubes S5 and S6, which together with the secondary side Qc1~Qc4 form phase C. The three phases are staggered 120 degrees.

[0032] In this topology, , so the gain ratio is ; 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, the gain ratio ( , and ),according to , and Get the primary 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 Fig.10 The relevant embodiments of the resonant converter shown are not described in detail here; and combined with the current limiting loop given in the above embodiment, the switching frequency is synchronously closed-loop adjusted to make the three-phase switching frequency the same, thereby achieving the purpose of accurately controlling the current after a short circuit.

[0033] 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.

[0034] Fig.14 FIG. 1 is a schematic diagram of the structure of an electronic device 1000 provided by an embodiment of the present invention. Fig.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 may be one or more. Fig.14In the embodiment, a memory 1100 and a processor 1200 are taken as an example; the memory 1100 and the processor 1200 in the device may be connected via a bus or other means. Fig.14 The bus connection is taken as an example. The 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 of the resonant converter provided in any embodiment of the present invention. The processor 1200 implements the above-mentioned short-circuit current limiting protection method of the resonant converter by running the software programs, instructions and modules stored in the memory 1100.

[0035] 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 an application 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 arranged 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.

[0036] 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.

[0037] 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 executes the short-circuit current limiting protection method for a resonant converter provided in any embodiment of the present invention.

[0038] 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.

[0039] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0040] In hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As is well known to those of ordinary skill in the art, the term computer storage medium 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 include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that 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.

[0041] The terms "component", "module", "system", etc. used in this specification are used to represent 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 applications running on a computing device and a computing device can be components. One or more components may reside in a process or an execution thread, and a component may be located on a computer or distributed between two or more computers. In addition, these components may be executed from various computer-readable media having various data structures stored thereon. Components may communicate, for example, through local or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, or a network, such as the Internet interacting with other systems through 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 parameter of the resonant converter and the gain ratio.

2. The short-circuit current limiting protection method for a resonant converter according to claim 1, characterized in that: 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; the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows: ； ； in, is the primary 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.

3. The short-circuit current limiting protection method for a resonant converter according to claim 2, characterized in that: The step of adjusting the current limiting associated parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and the 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 real-time value of the gain ratio obtained when the primary side is short-circuited, so as to increase 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 phase shift angle is adjusted to 0, thereby increasing the switching frequency.

4. The short-circuit current limiting protection method for a resonant converter according to claim 1, characterized in that: 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; the corresponding relationship between the current limiting associated parameters of the resonant converter and the gain ratio is as follows: ； ； 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.

5. The short-circuit current limiting protection method for a resonant converter according to claim 4, characterized in that: The step of adjusting the current limiting associated parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and the 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 real-time value of the gain ratio when the primary side is short-circuited, so as to increase 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 corresponding relationship between the primary duty cycle and the gain ratio and the real-time value of the gain ratio obtained when the secondary side is short-circuited, the secondary phase shift angle is adjusted to 0, and the switching frequency is increased.

6. The short-circuit current limiting protection method for a resonant converter according to claim 1, characterized in that: 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: ； ； in, is the primary phase shift angle, is the secondary duty cycle, is the gain ratio, , is the primary bridge arm voltage, is the secondary bridge arm voltage.

7. The short-circuit current limiting protection method for a resonant converter according to claim 6, characterized in that: The step of adjusting the current limiting associated parameters and the switching frequency of the resonant converter in real time according to the gain ratio and the acquired gain ratio change and the 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%, thereby increasing the switching frequency.

8. The short-circuit current limiting protection method for a resonant converter according to claim 3, characterized in that: Increasing the switching frequency is achieved by the following steps: The switching frequency is closed-loop regulated based on a preconfigured current limiting loop.

9. 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 8 is implemented.

10. 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 for the resonant converter as described in any one of claims 1 to 8.

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