Self-adaptive wave-by-wave current-limiting protection method and system for interleaved Boost converter

Abstract

The invention relates to the technical field of power electronics, in particular to a self-adaptive wave-by-wave current-limiting protection method for an interleaved Boost converter, which comprises the following steps of: acquiring input and output voltages, an inductance peak current of each phase and a working temperature based on a carrier cycle, and calculating a PWM duty ratio of a next carrier cycle; inputting the PWM duty ratio into the inductance saturation curve and the duty ratio calculation model, and predicting the inductance current change rate and the inductance current instantaneous maximum value Imax of the next carrier period; comparing the Imax with the Iin; if Imax is greater than Iin, an inductive current change rate evaluation step is carried out, and a wave-by-wave current limiting dynamic threshold value Ilimit is adjusted; when the next carrier wave period is reached, the inductance peak current of each phase is compared with the adjusted Ilimit dynamic; if yes, a protection signal is generated, the driving pulse of the phase in the current switching period is blocked, and the interleaved Boost converter is protected. According to the method, the wave-by-wave current limiting threshold can be dynamically adjusted, and the dynamic response speed and the overall performance of the system are maximized on the premise of ensuring safety.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to an adaptive wave-by-wave current limiting protection method, system, device and medium for interleaved parallel Boost converters. Background Technology

[0002] Interleaved parallel boost converters effectively reduce input current ripple and improve the system's power level and power density through multi-phase parallel and interleaved operation, and are therefore widely used in high-voltage and high-power applications requiring DC-DC conversion.

[0003] In these critical applications, system reliability is paramount. Overcurrent protection is a core technology for ensuring the safety of power switching devices (such as MOSFETs and IGBTs) and the entire converter. Currently, the most commonly used protection scheme in the industry is wave-by-wave current limiting protection with a fixed threshold. This technology sets a fixed peak current threshold for each phase, and when the switching current exceeds this threshold, the drive signal is immediately shut off within the current switching cycle. This traditional fixed threshold scheme has the following shortcomings: 1. The contradiction between dynamic performance and safety: To ensure operational safety under harsh conditions such as heavy-load startup and drastic load changes, the fixed threshold setting needs to be relatively conservative. However, this sacrifices the dynamic performance of the system, resulting in a slow startup process to avoid inrush current; when the load suddenly increases, the output voltage drops too much, and due to premature current limiting, it cannot provide enough instantaneous energy, causing the equipment to shut down due to undervoltage.

[0004] 2. Rigid protection strategy: Fixed thresholds cannot distinguish between normal instantaneous overloads (such as motor heavy load start-up) and dangerous short circuit faults, which may cause the system to perform unnecessary frequent protection during normal overloads, affecting continuous operation.

[0005] 3. Inability to adapt to environmental changes: The overcurrent capability of power devices changes with conditions such as temperature, current and voltage. Fixed thresholds cannot utilize this margin, resulting in excessive redundancy in system design and underutilization of performance. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0007] To address this, the present invention provides an adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters, which overcomes the inherent contradiction between dynamic performance and safety in fixed threshold wave-by-wave current limiting protection. It can dynamically adjust the wave-by-wave current limiting threshold according to the real-time operating status of the interleaved parallel Boost converter, thereby maximizing the dynamic response speed and overall performance of the system while ensuring safety.

[0008] An adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters according to an embodiment of the present invention includes the following steps: S1, construct the inductor saturation curve and duty cycle calculation model; S2, Input voltage V of the interleaved parallel Boost converter is acquired based on the carrier period to determine its operating state. in Output voltage V out Peak current I of each phase inductor peak Operating temperature T j ; S3, based on the input voltage V in Output voltage V out Peak current I of each phase inductor peak The PWM duty cycle for the next carrier cycle is calculated through voltage-current closed-loop calculation. This PWM duty cycle is then input into the inductor saturation curve and duty cycle calculation model to predict the inductor current change rate for the next carrier cycle. and the instantaneous maximum value of inductor current I max ; S4, the instantaneous maximum value of the inductor current I max With wave-by-wave current limiting initial threshold I in Compare; If I max >I in Then, the inductor current change rate evaluation step is performed, and the wave-by-wave current limiting dynamic threshold I is set. limit_dynamic Make dynamic adjustments; Conversely, if I max ≤I in If so, no adjustment is needed; S5, after entering the next carrier cycle, the peak current I of each phase inductor will be... peak With the adjusted wave-by-wave current limiting dynamic threshold I limit_dynamic Compare; If I peak ≥I limit_dynamic When this occurs, a protection signal is generated to block the drive pulse of that phase in the current switching cycle, thus protecting the interleaved parallel Boost converter.

[0009] The beneficial effect of this invention is that the adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters can dynamically adjust the wave-by-wave current limiting dynamic threshold I when the load changes stepwise. limit_dynamic This threshold ensures that the current stress, voltage stress, and thermal stress of magnetic devices and power devices are always within their safe operating range, achieving an optimal balance between protection coverage and system stability. It also allows for a safe overshoot of the current to meet dynamic response requirements, avoiding false protection caused by normal dynamic response.

[0010] According to an embodiment of the present invention, in the step of evaluating the rate of change of inductor current, dynamically adjusting the逐波限流动态阈值I limit_dynamic specifically includes: comparing the rate of change of inductor current with a preset slope threshold, and the preset slope threshold includes a first slope threshold and a second slope threshold; If the rate of change of inductor current > the first slope threshold, it is determined that the load has increased sharply. According to the working temperature T j , the逐波限流初始阈值I in and the junction temperature - current limiting threshold mapping relationship, adjust the逐波限流动态阈值I limit_dynamic , otherwise, do not adjust; If the rate of change of inductor current > the second slope threshold, it is determined to be a fault state, and then control the逐波限流动态阈值I limit_dynamic to be reduced to the逐波限流初始阈值I in , and trigger the shutdown protection.

[0011] According to an embodiment of the present invention, when adjusting the逐波限流动态阈值I limit_dynamic , the threshold adjustment amplitude of the逐波限流动态阈值I limit_dynamic is directly proportional to the instantaneous maximum value I of the inductor current max and the rate of change of inductor current .

[0012] According to an embodiment of the present invention, it is also based on the maximum inductor saturation current I Lmax or the IGBT collector repetitive peak current I CRM to perform segmented processing on the adjustment of the逐波限流动态阈值I limit_dynamic .

[0013] According to an embodiment of the present invention, the junction temperature - current limiting threshold mapping relationship includes: The junction temperature - current limiting threshold mapping relationship includes: comparing the maximum inductor saturation current and the IGBT collector repetitive peak current I CRM , and based on the working temperature T j to determine the working ambient temperature of the interleaved parallel Boost converter, and set the upper limit value of the逐波限流动态阈值I limit_dynamic ; wherein, When T j < T1, it is determined that the interleaved parallel Boost converter is operating in the low - temperature region. If I Lmax＞ I CRM, the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is set to the IGBT collector repetitive peak current I CRM ; If I Lmax≤ I H CRM , the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is set to the maximum inductor saturation current I Lmax ; When T1 < T j < T2, it is determined that the interleaved parallel Boost converter operates in the medium temperature range. If I Lmax＞ I CRM , the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is reduced to 0.5 I CRM ~0.8 [[ID=३२]] I CRM ; If I Lmax≤ I CRM , the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is reduced to 0.5 I Lmax ~0.8 I Lmax ; When T j > T2, it is determined that the interleaved parallel Boost converter operates in the high temperature range, and the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is reduced to a safety value close to the rated current.

[0014] According to an embodiment of the present invention, the PWM duty cycle of the next carrier period is calculated through voltage-current closed-loop operation, which specifically includes: Obtain the reference voltage V ref , and subtract the reference voltage V ref from the output voltage V out to obtain the voltage error V error ; Input the voltage error V error to the voltage outer loop controller for processing to obtain the reference signal I ref of the current inner loop; Subtract the inductance peak current I ref from the reference signal I peak of the current inner loop to obtain the current error I error ; The current error I error The input is processed by the inner current loop controller to generate a drive signal; The drive signal is input to the PWM modulator and compared with the triangular carrier wave to obtain the PWM duty cycle for the next carrier cycle.

[0015] An adaptive wave-by-wave current limiting protection system for interleaved parallel Boost converters according to an embodiment of the present invention, the system comprising: Interleaved parallel Boost converter; And a digital signal processor connected to the interleaved parallel Boost converter, the digital signal processor being configured to perform the adaptive wave-by-wave current limiting protection method for the interleaved parallel Boost converter as described above.

[0016] According to one embodiment of the present invention, the digital signal processor includes: The data acquisition module, connected to the interleaved parallel Boost converter, is used to acquire the input voltage V of the interleaved parallel Boost converter based on the carrier period to indicate its operating state. in Output voltage V out Peak current I of each phase inductor peak Operating temperature T j ; The data analysis module, connected to the data acquisition module, is used to analyze the input voltage V. in Output voltage V out Peak current I of each phase inductor peak The PWM duty cycle for the next carrier cycle is calculated through voltage-current closed-loop calculation. This PWM duty cycle is then input into the inductor saturation curve and duty cycle calculation model to predict the inductor current change rate for the next carrier cycle. and the instantaneous maximum value of inductor current I max ; And a data diagnostic module, connected to the data analysis module, used to process the instantaneous maximum value I of the inductor current. max With wave-by-wave current limiting initial threshold I in Compare; if I max >I in Then, the inductor current change rate evaluation step is performed, and the wave-by-wave current limiting dynamic threshold I is set. limit_dynamic After dynamic adjustment and entering the next carrier cycle, the peak inductor current I of each phase is... peak With the adjusted wave-by-wave current limiting dynamic threshold I limit_dynamic Compare, if I peak ≥I limit_dynamicWhen this occurs, a protection signal is generated to block the drive pulse of that phase in the current switching cycle, thus protecting the interleaved parallel Boost converter.

[0017] A computer device according to an embodiment of the present invention is characterized in that it comprises: processor; Memory, used to store executable instructions; The processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters as described above.

[0018] According to an embodiment of the present invention, a computer-readable storage medium is characterized in that the computer-readable storage medium stores a computer program, which, when executed by a processor, causes the processor to implement the adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters as described above.

[0019] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the interleaved parallel Boost converter according to Embodiment 1 of the present invention.

[0023] Figure 2 This is a schematic diagram of the method flow of Embodiment 1 of the present invention.

[0024] Figure 3 This is a schematic diagram of the voltage and current during the inductor switching stage of Embodiment 1 of the present invention.

[0025] Figure 4 This is a schematic diagram of PWM duty cycle calculation in Embodiment 1 of the present invention.

[0026] Figure 5 This is a schematic diagram of the wave-by-wave current limiting dynamic threshold adjustment in Embodiment 1 of the present invention.

[0027] Figure 6 This is a schematic diagram of the system structure of Embodiment 2 of the present invention.

[0028] Figure 7 This is a schematic diagram of the computer hardware device structure according to Embodiment 3 of the present invention.

[0029] In the diagram, 20 is an interleaved parallel Boost converter; 30 is a digital signal processor; 301 is a data acquisition module; 302 is a data analysis module; 303 is a data diagnostic module; 10 is a computer device; 1002 is a processor; 1004 is a memory; and 1006 is a transmission device. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Example 1 This application provides an adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters, such as... Figure 1 As shown, the interleaved parallel Boost converter in this embodiment consists of two Boost converter branches, which are staggered by 180°. Each branch comprises an inductor, a switching transistor, and a diode, and the voltage gain is achieved by adjusting the duty cycle of the switching transistor. Figure 2-3As shown, the adaptive wave-by-wave current limiting protection method includes the following steps: S1, construct the inductor saturation curve and duty cycle calculation model; S2, Input voltage V of the interleaved parallel Boost converter is acquired based on the carrier period to determine its operating state. in Output voltage V out Peak current I of each phase inductor peak and operating temperature T j ; S3, based on the input voltage V in Output voltage V out and the peak current I of each phase inductor peak The PWM duty cycle for the next carrier cycle is calculated through voltage-current closed-loop calculation. The PWM duty cycle is then input into the inductor saturation curve and duty cycle calculation model to predict the inductor current change rate for the next carrier cycle. and the instantaneous maximum value of inductor current I max ; S4, the instantaneous maximum value of the inductor current I max With wave-by-wave current limiting initial threshold I in Compare; If I max >I in Then, the inductor current change rate evaluation step is performed, and the wave-by-wave current limiting dynamic threshold I is set. limit_dynamic Make dynamic adjustments; Conversely, if I max ≤I in If so, no adjustment is needed; S5, after entering the next carrier cycle, the peak current I of each phase inductor will be... peak With the adjusted wave-by-wave current limiting dynamic threshold I limit_dynamic Compare; If I peak ≥I limit_dynamic If the condition is met, a protection signal is generated to block the drive pulse of that phase in the current switching cycle, thus protecting the interleaved parallel Boost converter; otherwise, the process returns to step S2.

[0034] In this embodiment, the inductor acts as an energy storage device in the Boost converter branch. The inductor charges when the switch is turned on, and the inductor current slope satisfies... To avoid the adjusted wave-by-wave current limiting dynamic threshold exceeding the inductor saturation current, the maximum duty cycle of the switching transistor needs to be evaluated in conjunction with the inductor saturation curve. Since the inductance L decreases with increasing current and the inductor slope changes non-linearly, this embodiment establishes an inductor saturation curve and duty cycle calculation model to calculate the inductor current change rate for the next carrier cycle. and the instantaneous maximum value of inductor current I max The estimate.

[0035] In this embodiment, the inductor saturation curve and duty cycle calculation model are stored in tables within the system. In actual use, the inductor current change rate for the next carrier cycle is predicted using a lookup table method based on the PWM duty cycle. and the instantaneous maximum value of inductor current I max .

[0036] In this embodiment, as Figure 5 As shown, the inductor current change rate evaluation steps are performed on the wave-by-wave current limiting dynamic threshold I. limit_dynamic Dynamic adjustment specifically includes: adjusting the rate of change of inductor current. Compared with a preset slope threshold, the preset slope threshold includes a first slope threshold and a second slope threshold. If the rate of change of inductor current If the slope exceeds the first threshold, it is determined that the load has increased sharply, and the wave-by-wave current limiting dynamic threshold I is applied. limit_dynamic Adjustments were made to the wave-by-wave current limiting dynamic threshold I. limit_dynamic The calculation formula is: , in, k coff This is the adjustment coefficient.

[0037] If the rate of change of inductor current If the slope exceeds the second threshold, a fault condition is determined, and the wave-by-wave current limiting dynamic threshold I is adjusted. limit_dynamic Reduced to the initial threshold I for wave-by-wave current limiting in This triggers shutdown protection. In the event of a fault, this embodiment can identify and immediately restore the current to the initial threshold I of wave-by-wave current limiting. in It performs rapid current limiting, effectively protecting switching transistors and diode power devices from damage and preventing the fault from escalating.

[0038] In this embodiment, the dynamic threshold I for wave-by-wave current limiting is... limit_dynamic When making adjustments, the wave-by-wave current limiting dynamic threshold I limit_dynamic Threshold adjustment range and instantaneous maximum value of inductor current I max and the rate of change of inductor current Proportional to allow parallel Boost converters to provide short-term overload capability.

[0039] In this embodiment, the maximum inductor saturation current will also be considered. I Lmax Or the repetitive peak current of the IGBT collector I CRM Dynamic threshold I for wave-by-wave current limiting limit_dynamic The adjustment is segmented to further ensure a safe overshoot of the current. This is based on the maximum inductor saturation current.I Lmax For further illustration, due to the non - linear transformation of the inductor, the larger the current, the smaller the inductance value, and the steeper the inductance curve. When the per - cycle current - limit dynamic threshold I limit_dynamic is close to 0.5 times the maximum inductor saturation current, if the adjustment coefficient k coff has an increment step of 0.5, when the per - cycle current - limit dynamic threshold I limit_dynamic is close to 0.7 times the maximum saturated inductor current, if the adjustment coefficient k coff has an increment step of 0.3.

[0040] In this embodiment, for the application scenarios where the high - voltage - side voltage is between 900V and 2000V, it is more appropriate to select an IGBT module with a higher withstand voltage as the switching device. The damage mechanisms of IGBTs are diverse and usually occur within microseconds or milliseconds. Only relying on the rated current is not sufficient to ensure safety.

[0041] When the load suddenly increases, the conduction duty cycle of the switching device (IGBT) in the Boost converter branch is at a relatively large proportion. As Figure 3 shown, when the IGBT is turned on, the current path is from the positive pole of the power supply, flowing through the inductor, then through the IGBT, and finally back to the negative pole of the power supply. The current shows an upward curve. At the same time, the free - wheeling diode undergoes reverse recovery, superimposing a reverse - recovery current on the IGBT, instantaneously increasing the conduction current of the IGBT. This process places relatively strict requirements on the IGBT current stress. It is necessary to control the conduction current within the IGBT collector repetitive peak current I CRM . During the IGBT turn - off process, the current path is from the positive pole of the power supply, flowing through the inductor, then through the free - wheeling diode, and finally to the load. The current at the instant of IGBT turn - off is the maximum value of the current during the turn - off stage, and the current shows a downward curve during this process. Therefore, during the turn - on and turn - off processes, the per - cycle current - limit dynamic threshold setting should be lower than the IGBT collector repetitive peak current I CRM . The junction - temperature - current - limit threshold mapping relationship includes: Compare the maximum inductor saturation current and the IGBT collector repetitive peak current I CRM , and based on the working temperature T j judge the working - environment temperature of the interleaved parallel Boost converter, and set the upper - limit value of the per - cycle current - limit dynamic threshold I limit_dynamic ; among which, when T j < T1 (such as T j < 100 ° °C), it is determined that the interleaved parallel Boost converter is operating in the low - temperature region. If I Lmax＞ ICRM , the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is set to the IGBT collector repetitive peak current I CRM ; If I Lmax≤ I CRM , the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is set to the maximum inductor saturation current I Lmax ; When T1 < T j < T2 (such as 100 ° °C < T j < 125 ° °C), it is determined that the interleaved parallel Boost converter operates in the medium temperature range. If I Lmax＞ I CRM , the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is reduced to 0.5 I CRM ~0.8 I [[ID=4C]] CRM ; If I [[ID=CC]] Lmax≤ I ]> CRM , the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is reduced to 0.5 I Lmax ~0.8 " I Lmax ; When T j > T2 (such as T j > 125 ° °C), it is determined that the interleaved parallel Boost converter operates in the high temperature range. Then, the upper limit value of the per-wave limited dynamic threshold I limit_dynamic is reduced to a safety value close to the rated current.

[0042] In the present invention, when adjusting the per-wave limited dynamic threshold, it is combined with temperature monitoring. When T j increases, based on the junction temperature - current limiting threshold mapping relationship, the upper limit value of the per-wave limited dynamic threshold can be actively reduced, realizing the change from passive protection to active prevention.

[0043] In this embodiment, when T j is close to the absolute maximum value T j_max , the shutdown protection is triggered to protect the interleaved parallel Boost converter.

[0044] In this embodiment, as Figure 4 As shown, the PWM duty cycle for the next carrier cycle is calculated through voltage and current closed-loop calculation, specifically including: Obtain the reference voltage V ref , the reference voltage V ref With output voltage V out The voltage error V is obtained by subtraction. error ; Voltage error V error The input is processed by the voltage outer loop controller to obtain the reference signal I for the current inner loop. ref ; The reference signal I of the inner current loop ref With the peak inductor current I peak The difference is used to obtain the current error I. error ; Current error I error The input is processed by the inner current loop controller to generate a drive signal; The drive signal is input to the PWM modulator and compared with the triangular carrier wave to obtain the PWM duty cycle for the next carrier cycle.

[0045] The adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters in this embodiment can dynamically adjust the wave-by-wave current limiting dynamic threshold I when the load changes stepwise. limit_dynamic This threshold ensures that the current stress, voltage stress, and thermal stress of magnetic devices and power devices are always within their safe operating range, achieving an optimal balance between protection coverage and system stability. It also allows for a safe overshoot of the current to meet dynamic response requirements, avoiding false protection caused by normal dynamic response.

[0046] Example 2 Based on the same inventive concept as the adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters in the foregoing embodiments, this application provides an adaptive wave-by-wave current limiting protection system for interleaved parallel Boost converters, such as... Figure 6 As shown, the system includes: Interleaved parallel Boost converter 20; And a digital signal processor 30, connected to the interleaved parallel Boost converter 20, the digital signal processor 30 being configured to perform the adaptive wave-by-wave current limiting protection method for the interleaved parallel Boost converter as described above.

[0047] In this embodiment, the digital signal processor 30 includes: Data acquisition module 301, connected to the interleaved parallel Boost converter, is used to acquire the input voltage V of the interleaved parallel Boost converter based on the carrier period to determine its operating state. inOutput voltage V out Peak current I of each phase inductor peak Operating temperature T j ; Data analysis module 302, connected to data acquisition module 301, is used to analyze the input voltage V. in Output voltage V out Peak current I of each phase inductor peak The PWM duty cycle for the next carrier cycle is calculated through voltage-current closed-loop calculation. The PWM duty cycle is then input into the inductor saturation curve and duty cycle calculation model to predict the inductor current change rate for the next carrier cycle. and the instantaneous maximum value of inductor current I max ; And a data diagnostic module 303, connected to the data analysis module 302, used to process the instantaneous maximum value I of the inductor current. max With wave-by-wave current limiting initial threshold I in Compare; if I max >I in Then, the inductor current change rate evaluation step is performed, and the wave-by-wave current limiting dynamic threshold I is set. limit_dynamic After dynamic adjustment and entering the next carrier cycle, the peak inductor current I of each phase is... peak With the adjusted wave-by-wave current limiting dynamic threshold I limit_dynamic Compare, if I peak ≥I limit_dynamic When this occurs, a protection signal is generated to block the drive pulse of that phase in the current switching cycle, thus protecting the interleaved parallel Boost converter.

[0048] The foregoing Figure 1 The various variations and specific examples of the adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters in Embodiment 1 are also applicable to the adaptive wave-by-wave current limiting protection system for interleaved parallel Boost converters in this embodiment. Through the foregoing detailed description of the adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters, those skilled in the art can clearly understand the implementation method of the adaptive wave-by-wave current limiting protection system for interleaved parallel Boost converters in this embodiment. Therefore, for the sake of brevity, it will not be described in detail here.

[0049] Example 3 This application provides a computer device including a processor and a memory. The memory stores at least one instruction or at least one program, which is loaded and executed by the processor to implement an adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters as provided in the above method embodiments.

[0050] Figure 7 This diagram illustrates a hardware structure of an apparatus for implementing an adaptive wave-by-wave current limiting protection method for an interleaved parallel Boost converter provided in an embodiment of this application. The apparatus may constitute or include the device or system provided in the embodiment of this application. Figure 7 As shown, the computer device 10 may include one or more processors 1002 (the processor may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.), a memory 1004 for storing data, and a transmission device 1006 for communication functions. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the I / O interface), a network interface, a power supply, and / or a camera. Those skilled in the art will understand that... Figure 7 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer device 10 may also include... Figure 7 The more or fewer components shown, or having the same Figure 7 The different configurations shown.

[0051] It should be noted that the aforementioned one or more processors and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be embodied, in whole or in part, in software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuit may be a single, independent processing module, or may be integrated, in whole or in part, into any other element within the computer device 10 (or mobile device). As involved in the embodiments of this application, the data processing circuit serves as a processor control mechanism (e.g., selection of a variable resistor termination path connected to an interface).

[0052] The memory 1004 can be used to store software programs and modules for application software, such as the program instruction / data storage device corresponding to the adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters in this embodiment of the application. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 1004, thereby implementing the aforementioned method. The memory 1004 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 1004 may further include memory remotely located relative to the processor, and these remote memories can be connected to the computer device 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0053] The transmission device 1006 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the communication provider of the computer device 10. In one example, the transmission device 1006 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 1006 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0054] The display may be, for example, a touchscreen liquid crystal display (LCD) that allows the user to interact with the user interface of the computer device 10 (or mobile device).

[0055] Example 4 This application embodiment also provides a computer-readable storage medium, which can be disposed in a server to store at least one instruction or at least one program related to implementing an adaptive wave-by-wave current limiting protection method for an interleaved parallel Boost converter in the method embodiment. The at least one instruction or the at least one program is loaded and executed by the processor to implement the adaptive wave-by-wave current limiting protection method for an interleaved parallel Boost converter provided in the above method embodiment.

[0056] Optionally, in this embodiment, the storage medium may be located at at least one of the multiple network servers in a computer network. Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0057] Example 5 This invention also provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform an adaptive wave-by-wave current limiting protection method for interleaved parallel Boost converters provided in the various optional embodiments described above.

[0058] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in a different order than that shown in the embodiments and still achieve the desired results. Additionally, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired results. In some implementations, multitasking and parallel processing are also possible or may be advantageous.

[0059] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device, equipment, and storage medium embodiments are basically similar to the method embodiments, so the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0060] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0061] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An adaptive per-cycle current limiting protection method for interleaved parallel Boost converters, characterized in that, The method comprises the following steps: S1, constructing an inductance saturation curve and a duty cycle calculation model; S2, input voltage V of working state of interleaved parallel Boost converter is collected based on carrier cycle in , output voltage V out , peak current I of each phase inductor peak , and working temperature T j ; S3, according to the input voltage V in , the output voltage V out and the peak inductance current I peak of each phase, the PWM duty cycle of the next carrier cycle is calculated by voltage-current closed-loop operation, the PWM duty cycle is input to the inductance saturation curve and duty cycle calculation model, the inductance current change rate and the inductance current instantaneous maximum I max of the next carrier cycle are predicted; S4, comparing said inductance current instantaneous maximum I max with the wave-by-wave current limiting initial threshold I in comparison; If I max > I in , then a rate of inductance current change evaluation step is performed to dynamically adjust the per-wave current limiting dynamic threshold I limit_dynamic . Conversely, if I max ≤ I in , then no adjustment. S5, after entering the next carrier cycle, the peak current I of each phase is compared with the adjusted dynamic threshold I peak and the adjusted dynamic threshold I limit_dynamic for current limiting per wave If I peak ≥ I limit_dynamic , a protection signal is generated to block the driving pulse of the phase in the current switching period, and the interleaved parallel Boost converter is protected.

2. The adaptive per-cycle current limit protection method for interleaved parallel Boost converters of claim 1, wherein, The inductance current change rate evaluation step compares the inductance current change rate with a preset slope threshold value, and the preset slope threshold value includes a first slope threshold value and a second slope threshold value. limit_dynamic The dynamic adjustment specifically includes: adjusting the inductance current change rate The inductance current change rate evaluation step compares the inductance current change rate with a preset slope threshold value, and the preset slope threshold value includes a first slope threshold value and a second slope threshold value. If the inductance current rate of change is greater than the first slope threshold value, then it is determined that the load is sharply increased, and the working temperature T j is adjusted according to the working temperature T in , and the wave-by-wave current limiting initial threshold value I limit_dynamic is adjusted according to the junction temperature-current limiting threshold value mapping relationship, otherwise, it is not adjusted; If the inductance current rate of change > the second slope threshold, then a fault condition is determined and the wave-by-wave current limiting dynamic threshold I limit_dynamic is reduced to the wave-by-wave current limiting initial threshold I in and a shutdown protection is triggered.

3. The adaptive per-cycle current-limiting protection method for interleaved parallel Boost converters of claim 2, wherein, to said wave-by-wave current limiting dynamic threshold I limit_dynamic said wave-by-wave current limiting dynamic threshold I limit_dynamic is adjusted in proportion to the threshold adjustment amplitude and to the inductance current instantaneous maximum value I max and to the inductance current rate of change .

4. The adaptive per-cycle current limit protection method for interleaved parallel Boost converters of claim 3, wherein, Also based on maximum inductance saturation current I Lmax Or IGBT collector repetitive peak current I CRM The adjustment of the said wave-by-wave current limiting dynamic threshold I limit_dynamic Is processed in segments.

5. The adaptive per-cycle current-limiting protection method for interleaved parallel Boost converters of claim 4, wherein, The threshold mapping relationship of the junction temperature-current limit includes comparing the maximum inductance saturation current with the IGBT collector repeated peak current I CRM and based on the working temperature T j determining the working environment temperature of the interleaved parallel Boost converter, setting the upper limit value of the dynamic threshold I limit_dynamic of the wave-by-wave current limit; wherein, When T j <T1, it is determined that the interleaved parallel Boost converter works in the low temperature zone, and if I Lmax＞ I CRM The upper limit value of the dynamic threshold I limit_dynamic of the current limiting per wave is set as the collector repetitive peak current I I CRM of the IGBT; If I Lmax≤ I CRM the upper limit value of the wave-by-wave current limiting dynamic threshold I limit_dynamic is set to the maximum inductance saturation current I Lmax ; When T1 < T j < T2, it is determined that the interleaved parallel Boost converter works in the medium temperature zone, and if I Lmax＞ I CRM , the upper limit value of the dynamic threshold I limit_dynamic of the current limiting per wave is reduced to 0.5 I CRM ~0.8 I CRM ; If I Lmax≤ I CRM the per-wave current limiting dynamic threshold I limit_dynamic is reduced to 0.5 I Lmax ~0.8 I Lmax ; When T j > T2, it is determined that the interleaved parallel Boost converter works in the high temperature region, and the upper limit value of the dynamic threshold I limit_dynamic of the current limiting per wave is reduced to a safe value close to the rated current.

6. The adaptive per-cycle current limit protection method for interleaved parallel Boost converters of claim 1, wherein, The PWM duty cycle of the next carrier cycle is calculated through voltage-current closed loop operation, specifically comprising: acquiring a reference voltage V ref , the reference voltage V ref is obtained by subtracting the output voltage V out from the reference voltage V error ; The voltage error V error is input to a voltage outer loop controller process to obtain a reference signal I ref for the current inner loop; The reference signal I of the inner current loop ref With the peak inductor current I peak The difference is used to obtain the current error I. error ; The current error I error is input to a current inner loop controller process to generate a drive signal; The driving signal is input to the PWM modulator, compared with the triangular carrier, and the PWM duty cycle of the next carrier cycle is obtained.

7. An adaptive per-cycle current limit protection system for interleaved parallel Boost converters, characterized in that, The system comprises: An interleaved parallel Boost converter; And a digital signal processor connected with the interleaved parallel Boost converter, configured to execute the adaptive wave-by-wave current limiting protection method for the interleaved parallel Boost converter according to any one of claims 1 to 6.

8. The adaptive per-cycle current-limiting protection method for interleaved parallel Boost converters of claim 7, wherein, The digital signal processor comprises: The data acquisition module is connected with the interleaved parallel Boost converter, and is used for acquiring input voltage V in , output voltage V out , peak current I peak of each phase inductor, working temperature T j of the interleaved parallel Boost converter based on a carrier period. The data analysis module is connected with the data acquisition module, and is used for calculating the PWM duty ratio of the next carrier period according to the input voltage V in , the output voltage V out , the peak current I peak of each phase inductance, inputting the PWM duty ratio into the inductance saturation curve and duty ratio calculation model, and predicting the inductance current change rate and the inductance current instantaneous maximum value I max of the next carrier period through voltage and current closed loop operation. ​ and a data diagnostic module connected with the data analysis module, for comparing the inductance current instantaneous maximum value I max with the initial threshold value I in of the wave-by-wave current limiting; if I max >I in , then performing an inductance current change rate evaluation step, dynamically adjusting the dynamic threshold value I limit_dynamic of the wave-by-wave current limiting, and after entering the next carrier cycle, comparing the inductance peak current I peak of each phase with the adjusted dynamic threshold value I limit_dynamic of the wave-by-wave current limiting; if I peak ≥I limit_dynamic , then generating a protection signal to block the driving pulse of the phase in the current switching cycle, and protecting the interleaved parallel Boost converter.

9. A computer device, comprising: Comprises: A processor; A memory for storing executable instructions; Wherein the processor is used to read the executable instructions from the memory and execute the executable instructions to realize the adaptive wave-by-wave current limiting protection method for the interleaved parallel Boost converter according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, when the computer program is executed by the processor, so that the processor realizes the adaptive wave-by-wave current limiting protection method for the interleaved parallel Boost converter according to any one of claims 1 to 6.

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